patches/series0000644000076400007640000004375011043706530012460 0ustar tglxtglx# # base tree: 2.6.23-rc4 # # # Mainline fixes # idle-fix.patch idle2-fix.patch # .27 backports m68knommu_fixes_ontop_of_v2.6.26.patch pmtmr-override.patch revert-preempt-bkl-revert.patch # RCU rcu-trace-fix-free.patch rcu-preempt-fix-bad-dyntick-accounting.patch rcu-preempt-boost-sdr.patch rcu-preempt-boost-default.patch rcu-preempt-boost-fix.patch rcu-hrt-fixups.patch rcu-new-7.patch rcu-torture-preempt-update.patch rcupreempt-boost-early-init.patch rt_mutex_setprio.patch qrcu.patch rcu-preempt-hotplug-hackaround.patch call_rcu_bh-rename-of-call_rcu.patch # the rcu trace markers need to be updated to the new markers. #rcu-preempt-trace-markers-1.patch #rcu-preempt-trace-markers-2.patch # # RT Balancing code # # Taken from sched-devel.git # # Last patch of the RT balancing code (not yet in sched-devel) sched-use-a-2d-bitmap-search-prio-cpu.patch # FTRACE tracing ftrace-upstream.patch frace-use-tsc.patch ftrace-function-record-nop.patch ftrace-use-preempt-disable-not-irq-disable.patch # ftrace-handle-time-outside-of-lockdep.patch cycles-to-ns-trace-fix.patch native-sched-clock-booboo.patch # ftrace RT extensions tracer-add-event-markers.patch #tracer-use-sched-clock.patch tracer-event-trace.patch trace-histograms.patch trace_hist-divzero.patch event-tracer-syscall-x86_64.patch event-tracer-syscall-i386.patch trace-events-handle-syscalls.patch preempt-trace.patch ftrace-hotplug-fix.patch ftrace-stop-trace-on-crash.patch ftrace-document-update1.patch ftrace-document-event-tracer.patch ftrace-preempt-trace-check.patch trace-do-not-wakeup-when-irqs-disabled.patch # ARM trace hook trace-add-event-markers-arm.patch # Powerpc ftrace powerpc-ftrace-stop-on-oops.patch ppc-gtod-notrace-fix.patch ppc32_notrace_init_functions.patch # m68knommu ftrace ftrace-m68knommu-add-FTRACE-support.patch ftrace-m68knommu-generic-stacktrace-function.patch # KVM - RT fixes sched-enable-irqs-in-preempt-in-notifier-call.patch # # Check what's in mainline / mm or might be # upstream material. # spinlock-trylock-cleanup-sungem.patch x86_64-tsc-sync-irqflags-fix.patch neptune-no-at-keyboard.patch rtmutex-debug.h-cleanup.patch netpoll-8139too-fix.patch kprobes-preempt-fix.patch replace-bugon-by-warn-on.patch # Suspend / resume fixups i386-mark-atomic-irq-ops-raw.patch msi-suspend-resume-workaround.patch floppy-resume-fix.patch # # assorted fixlets from -mm: # # Check if they are really in -mm or should be submitted # hrtimers-overrun-api.patch mm-fix-latency.patch ioapic-fix-too-fast-clocks.patch fix-acpi-build-weirdness.patch move-native-irq.patch dont-unmask-io_apic.patch # # misc build beautification patches: # gcc-warnings-shut-up.patch # # Various fixlets # nfs-stats-miss-preemption.patch random-driver-latency-fix.patch # # Debugging patches # apic-dumpstack.patch # # Latency tracer # nmi-profiling-base.patch latency-tracing-ppc.patch latency-tracing-arm.patch arm-latency-tracer-support.patch # Needs to be rewritten to trigger on the procfs variable ! # x reset-latency-histogram.patch latency-measurement-drivers.patch # # lockdep queue: # lockdep-show-held-locks.patch lockdep-lock_set_subclass.patch lockdep-prettify.patch lockdep-more-entries.patch # # Revert loopback bh assumption patch # loopback-revert.patch # # PPC gtod and highres support # # -rt queue: # #inet_hash_bits.patch #inet-hash-bits-ipv6-fix.patch # # ARM preperatory patches # # CHECKME: Talk to rmk ! # arm-cmpxchg-support-armv6.patch arm-futex-atomic-cmpxchg.patch arm-preempt-config.patch # # m68knommu # m68knommu-make-cmpxchg-RT-safe.patch # # generic cmpxchg # # # IRQ threading # generic-cmpxchg-use-raw-local-irq-variant.patch preempt-softirqs-core.patch preempt-irqs-core.patch #preempt-irqs-softirq-in-hardirq.patch preempt-irqs-direct-debug-keyboard.patch preempt-irqs-timer.patch preempt-irqs-hrtimer.patch preempt-irqs-i386.patch preempt-irqs-i386-ioapic-mask-quirk.patch preempt-irqs-mips.patch preempt-irqs-x86-64.patch preempt-irqs-x86-64-ioapic-mask-quirk.patch preempt-irqs-arm.patch preempt-irqs-arm-fix-oprofile.patch preempt-irqs-ppc.patch preempt-irqs-ppc-ack-irq-fixups.patch preempt-irqs-ppc-fix-b5.patch preempt-irqs-ppc-fix-b6.patch # file not found #preempt-irqs-ppc-celleb-beatic-eoi.patch preempt-irqs-ppc-fix-more-fasteoi.patch preempt-irqs-ppc-preempt-schedule-irq-entry-fix.patch preempt-irqs-m68knommu-make-timer-interrupt-non-threaded.patch preempt-irqs-Kconfig.patch # # Real real time stuff :) # rt-apis.patch rt-slab-new.patch rt-page_alloc.patch # # rt-mutexes # rt-mutex-preempt-debugging.patch rt-mutex-irq-flags-checking.patch rt-mutex-trivial-tcp-preempt-fix.patch rt-mutex-trivial-route-cast-fix.patch rt-mutex-i386.patch rt-mutex-x86-64.patch rt-mutex-core.patch rt-mutex-mips.patch rt-mutex-ppc.patch rt-mutex-ppc-fix-a5.patch rt-mutex-arm.patch rt-mutex-compat-semaphores.patch # # Per-CPU locking assumption cleanups: # percpu-locked-mm.patch percpu-locked-netfilter.patch percpu-locked-netfilter2.patch percpu-locked-powerpc-fixups.patch #percpu-locked-powerpc-fixups-a6.patch # # Various preempt fixups # net-core-preempt-fix.patch bh-uptodate-lock.patch bh-state-lock.patch jbd_assertions_smp_only.patch # # Tasklet redesign # tasklet-redesign.patch tasklet-busy-loop-hack.patch # # Diable irq poll on -rt # disable-irqpoll.patch # # Inaccurate -rt stats (should be replaced by CFS) # kstat-add-rt-stats.patch # Misc preempt-realtime-warn-and-bug-on.patch # # Posix-cpu-timers in a thread # cputimer-thread-rt_A0.patch cputimer-thread-rt-fix.patch posix-cpu-timers-fix.patch # # Various broken drivers # vortex-fix.patch serial-locking-rt-cleanup.patch fix-emac-locking-2.6.16.patch # # Serial optimizing # serial-slow-machines.patch # # Realtime patches # # ARM: preempt-realtime-ftrace.patch preempt-realtime-ftrace-disable-ftraced.patch preempt-realtime-arm.patch preempt-realtime-arm-rawlock-in-mmu_context-h.patch arm-trace-preempt-idle.patch preempt-realtime-arm-bagde4.patch preempt-realtime-arm-footbridge.patch preempt-realtime-arm-integrator.patch preempt-realtime-arm-ixp4xx.patch preempt-realtime-arm-pxa.patch preempt-realtime-arm-shark.patch # MIPS: needs splitting preempt-realtime-mips.patch #mips-gtod_clocksource.patch # X86_64: needs splitting preempt-realtime-x86_64.patch # IA64: needs splitting preempt-realtime-ia64.patch # PPC: needs cleanup preempt-realtime-powerpc.patch preempt-realtime-powerpc-update.patch preempt-realtime-powerpc-b2.patch preempt-realtime-powerpc-b3.patch preempt-realtime-powerpc-b4.patch preempt-realtime-powerpc-add-raw-relax-macros.patch preempt-realtime-powerpc-tlb-batching.patch preempt-realtime-powerpc-celleb-raw-spinlocks.patch preempt-realtime-powerpc-missing-raw-spinlocks.patch # SuperH: needs splitting # Also needs to be ported again! # preempt-realtime-sh.patch # i386 preempt-realtime-i386.patch remove-check-pgt-cache-calls.patch preempt-irqs-i386-idle-poll-loop-fix.patch # # Core patch # # Note this is a convenience split up it is not supposed to compile # step by step. Needs some care, but it is way easier to handle than # the previous touch all in one patch # preempt-realtime-sched.patch preempt-realtime-mmdrop-delayed.patch preempt-realtime-sched-i386.patch preempt-realtime-prevent-idle-boosting.patch # preempt-realtime-cfs-accounting-fix.patch schedule-tail-balance-disable-irqs.patch preempt-realtime-sched-cpupri.patch preempt-realtime-core.patch preempt-realtime-fs-block.patch preempt-realtime-acpi.patch preempt-realtime-ipc.patch preempt-realtime-sound.patch preempt-realtime-mm.patch preempt-realtime-init-show-enabled-debugs.patch preempt-realtime-compile-fixes.patch preempt-realtime-console.patch preempt-realtime-debug-sysctl.patch preempt-realtime-ide.patch preempt-realtime-input.patch preempt-realtime-irqs.patch preempt-realtime-net-drivers.patch #preempt-realtime-netconsole.patch preempt-realtime-printk.patch preempt-realtime-profiling.patch preempt-realtime-rawlocks.patch preempt-realtime-rcu.patch preempt-realtime-timer.patch kstat-fix-spurious-system-load-spikes-in-proc-loadavgrt.patch preempt-realtime-usb.patch preempt-realtime-warn-and-bug-on-fix.patch # # Various -rt fixups # #preempt-realtime-supress-cpulock-warning.patch preempt-realtime-supress-nohz-softirq-warning.patch preempt-realtime-net.patch preempt-realtime-net-softirq-fixups.patch preempt-realtime-loopback.patch #preempt-realtime-8139too-rt-irq-flags-fix.patch preempt-realtime-mellanox-driver-fix.patch # # Utility patches (not for upstream inclusion): # preempt-realtime-supress-rtc-printk.patch hrtimer-no-printk.patch nmi-profiling.patch panic-dont-stop-box.patch nmi-watchdog-disable.patch # # soft watchdog queue: # #softlockup-fix.patch softlockup-add-irq-regs-h.patch #softlockup-better-printout.patch #softlockup-cleanups.patch #softlockup-use-cpu-clock.patch # # Not yet reviewed # gtod-optimize.patch # # Pete's file locking scalability changes: # s_files-schedule_on_each_cpu_wq.patch ## Missing patch -- SDR ## See http://programming.kicks-ass.net/kernel-patches/schedule_on_cpu.patch # schedule_on_cpu.patch s_files-pipe-fix.patch # # Pete's file locking scalability changes: # lockdep_lock_set_subclass_fix.patch lock_list.patch percpu_list.patch s_files.patch fix-circular-locking-deadlock.patch # # START of Pete's ccur-pagecache queue # # # lockless pagecache # #2.6.21-rc6-lockless1-prep-find_lock_page.patch #2.6.21-rc6-lockless2-radix-tree-use-indirect-bit.patch 2.6.21-rc6-lockless3-radix-tree-gang-slot-lookups.patch #2.6.21-rc6-lockless4-__add_to_swap_cache-stuff.patch 2.6.21-rc6-lockless5-lockless-probe.patch 2.6.21-rc6-lockless6-speculative-get-page.patch 2.6.21-rc6-lockless7-lockless-pagecache-lookups.patch 2.6.21-rc6-lockless8-spinlock-tree_lock.patch # # concurrent (write side) page cache # radix-tree-concurrent.patch mapping_nrpages.patch mapping_nrpages-fix.patch lock_page_ref.patch mm-concurrent-pagecache.patch radix-tree-optimistic.patch radix-tree-optimistic-hist.patch radix-concurrent-lockdep.patch #radix-tree-path-compression.patch # # -rt bits # mm-concurrent-pagecache-rt.patch # # END of Pete's ccur-pagecache queue # # # kmap atomix fixes # kmap-atomic-prepare.patch pagefault-disable-cleanup.patch kmap-atomic-i386-fix.patch # # Not yet reviewed # select-error-leak-fix.patch fix-emergency-reboot.patch timer-freq-tweaks.patch # # Highmem modifications # highmem-revert-mainline.patch highmem_rewrite.patch highmem-redo-mainline.patch rt-kmap-scale-fix.patch # # Debug patches: # pause-on-oops-head-tail.patch i386-nmi-watchdog-show-regs.patch # # x86-64 vsyscall modifications # x86-64-tscless-vgettimeofday.patch #vsyscall-fixadder-pa.patch # # Timekeeping fixups # # x rt-time-starvation-fix.patch # x rt-time-starvation-fix-update.patch # # RT-Java testing stuff # Add-dev-rmem-device-driver-for-real-time-JVM-testing.patch Allocate-RTSJ-memory-for-TCK-conformance-test.patch # # Softirq modifications # new-softirq-code.patch softirq-per-cpu-assumptions-fixes.patch fix-migrating-softirq.patch only-run-softirqs-from-irq-thread-when-irq-affinity-is-set.patch fix-softirq-checks-for-non-rt-preempt-hardirq.patch smp-processor-id-fixups.patch # # Weird crap unearthed by -rt which needs to be investigated # irda-fix.patch nf_conntrack-weird-crash-fix.patch nf_conntrack-fix-smp-processor-id.patch # # Needs proper fix # print-might-sleep-hack.patch lockdep-rt-mutex.patch lockstat-rt-hooks.patch lockstat_bounce_rt.patch # # KVM: # #kvm-rt.patch # # Add RT to uname and apply the version # RT_utsname.patch # # not yet backmerged tail patches: # preempt-rt-no-slub.patch paravirt-function-pointer-fix.patch quicklist-release-before-free-page.patch quicklist-release-before-free-page-fix.patch disable-lpptest-on-nonlinux.patch sched-rt-stats.patch mitigate-resched-flood.patch genirq-soft-resend.patch relay-fix.patch schedule_on_each_cpu-enhance.patch #schedule_on_each_cpu-enhance-rt.patch lockdep-rt-recursion-limit-fix.patch cond_resched_softirq-WARN-fix.patch irq-mask-fix.patch # stuff Ingo put into version.patch export-schedule-on-each-cpu.patch # Tony Breeds POWERPC patches powerpc-count_active_rt_tasks-is-undefined-for-non-preempt-rt.patch powerpc-match-__rw_yield-function-declaration-to-prototype.patch #powerpc-flags-as-passed-to-spin-x-irqsave-should-be-unsigned-long.patch powerpc-flush_tlb_pending-is-no-more.patch # fix-alternate_node_alloc.patch fix-compilation-for-non-RT-in-timer.patch hack-convert-i_alloc_sem-for-direct_io-craziness.patch dont-let-rt-rw_semaphores-do-non_owner-locks.patch rt-s_files-kill-a-union.patch loadavg_fixes_weird_loads.patch # HPET patches watchdog_use_timer_and_hpet_on_x86_64.patch # x stop-critical-timing-in-idle.patch # rt-wakeup-fix.patch disable-ist-x86_64.patch plist-debug.patch seq-irqsave.patch numa-slab-freeing.patch # Peter's patches # # workqueue PI # rt-list-mods.patch rt-plist-mods.patch rt-workqeue-prio.patch rt-workqueue-barrier.patch rt-wq-barrier-fix.patch rt-delayed-prio.patch sched_prio.patch # x critical-timing-kconfig.patch lock-init-plist-fix.patch ntfs-local-irq-save-nort.patch dont-disable-preemption-without-IST.patch #rt-powerpc-workarounds.patch filemap-dont-bug-non-atomic.patch fix-bug-on-in-filemap.patch rt-sched-groups.patch send-nmi-all-preempt-disable.patch printk-dont-bug-on-sched.patch user-no-irq-disable.patch drain-all-local-pages-via-sched.patch local_irq_save_nort-in-swap.patch # x latency-tracer-arch-low-address.patch proportions-raw-locks.patch arm-compile-fix.patch no-warning-for-irqs-disabled-in-local-bh-enable.patch #page-alloc-use-real-time-pcp-locking-for-page-draining.patch #power-fixes-for-kernbench.patch handle-pending-in-simple-irq.patch # AT91 patches use-edge-triggered-irq-handler-instead-of-simple-irq.patch # x latency-tracer-dont-panic-on-failed-bootmem-alloc.patch dev-queue-xmit-preempt-fix.patch ppc-hacks-to-allow-rt-to-run-kernbench.patch # x time-accumulate-offset-fix.patch ppc-make-tlb-batch-64-only.patch ppc-chpr-set-rtc-lock.patch disable-run-softirq-from-hardirq-completely.patch hack-fix-rt-migration.patch mips-remove-conlicting-rtc-lock-declaration.patch mips-remove-finish-arch-switch.patch mips-change-raw-spinlock-type.patch ppc32-latency-compile-hack-fixes.patch mips-remove-duplicate-kconfig.patch apic-level-smp-affinity.patch timer-warning-fix.patch printk-in-atomic.patch root-domain-kfree-in-atomic.patch printk-in-atomic-hack-fix.patch slab-irq-nopreempt-fix.patch ppc-tlbflush-preempt.patch swap-spinlock-fix.patch aacraid-compat-sem.patch # percpu fixes to handle debug_smp_processor_id errors. radix-percpu-hack-fix.patch genhd-protect-percpu-var.patch sched-clock-nmi.patch sched_rt-fixup.patch # Temp patch to disable RT sched groups #disable-sched-rt-groups.patch cache_pci_find_capability.patch nmi-watchdog-fix-1.patch nmi-watchdog-fix-2.patch nmi-watchdog-fix-3.patch nmi-watchdog-fix-4.patch rt-avoid-deadlock-in-swap.patch rt-move-update-wall-time-back-to-do-timer.patch rt-shorten-softirq-thread-names.patch # This patch breaks rt-migrate-test #sched-rt-push-only-new.patch #time-gcc-linker-error.patch rtmutex-lateral-steal.patch rtmutex-rearrange.patch rtmutex-remove-xchg.patch adaptive-spinlock-lite-v2.patch # RW locks with multiple readers rwsems-multiple-readers.patch # Folded into rwsems-multiple-readers.patch #rwlocks-lateral-steal.patch rwlocks-multiple-readers.patch multi-reader-account.patch multi-reader-limit.patch multi-reader-lock-account.patch multi-reader-pi.patch rwlocks-default-nr-readers-nr-cpus.patch rtmutex-rwlock-cmpxchg-typecast.patch rwlock-implement-downgrade-write.patch sched-nr-migrate-lower-default-preempt-rt.patch arm-fix-compile-error-trace-exit-idle.patch # Peter's fair load_balance break out patches sched-wake_up_idle_cpu-rt.patch # Needs some work still # sched_load_balance_flags.patch # sched_load_balance_lockbreak.patch # sched-load_balance-iterator.patch # sched-load_balance-stop.patch # sched-load_balance-is_runnable.patch # some ftrace fix ups ftrace-trace-sched.patch lockdep-avoid-fork-waring.patch ftrace-dont-trace-markers.patch ftrace-record-comm-on-ctrl.patch ftrace-print-missing-cmdline.patch # Peter's lockstat updates lockstat-fix-contention-points.patch lockstat-output.patch # Luis's gtod updates fix_vdso_gtod_vsyscall64_2.patch rwlocks-fix-no-preempt-rt.patch git-ignore-script-lpp.patch # Adaptive Locks adaptive-optimize-rt-lock-wakeup.patch adaptive-task-oncpu.patch adaptive-adjust-pi-wakeup.patch adapt-remove-extra-try-to-lock.patch adaptive-earlybreak-on-steal.patch realtime-preempt-warn-about-tracing.patch ftrace-compile-fixes.patch ftrace-fix-header.patch nmi-show-regs-fix.patch # Gregory's Sched updates sched-prioritize-non-migrating-rt-tasks.patch trace_hist-latediv.patch arm-omap-02.patch arm-omap-05.patch trace-eip2ip.patch rwlock-prio-fix.patch rwlock-fixes.patch event-trace-hrtimer-trace.patch trace-ktime-scalar.patch rwlock-torture.patch ftrace-wakeup-rawspinlock.patch radix-tree-lockdep-plus1.patch sched-cpupri-hotplug-support.patch sched-cpupri-priocount.patch # still needs Signed-off-by: #sched-global-rt-runtime.patch rwlock-pi-lock-reader.patch fix-adaptive-hack.patch rwlock-slowunlock-mutex-fix.patch rwlock-slowunlock-mutex-fix2.patch rt-mutex-use-inline.patch rt-mutex-namespace.patch rtmutex-debug-fix.patch fix-config-debug-rt-mutex-lock-underflow-warnings.patch rwlock-protect-reader_lock_count.patch rt-rwlock-conservative-locking.patch rwlock-torture-no-rt.patch warn-on-rt-scatterlist.patch sub-dont-disable-irqs.patch # CHECKME #cpu-hotplug-vs-slab.patch #cpu-hotplug-vs-page-alloc.patch #cpu-hotplug-cpu-up-vs-preempt-rt.patch #rcu-backport-rcu-cpu-hotplug-support.patch #cpu-hotplug-cpu-down-vs-preempt-rt.patch #re-cpu-hotplug-cpu-down-vs-preempt-rt.patch #hotplug-smp-boot-fix.patch #cpu-hotplug-fix-fix-fix.patch # CHECKME #fix_SCHED_FIFO_spec_violation.patch ppc64-fix-preempt-unsafe-paths-accessing-per_cpu-variables.patch fix-a-previously-reverted-fix.patch #CHECKME powerpc-xics-move-the-call-to-irq-radix-revmap-from-xics-startup-to-xics-host-map.patch #CHECKME powerpc-make-the-irq-reverse-mapping-radix-tree-lockless.patch bz235099-idle-load-fix.patch raw-spinlocks-for-nmi-print.patch sched-fix-dequeued-race.patch ftrace-fix-get-kprobe-wreckage.patch version.patch patches/idle-fix.patch0000664000076400007640000002511311043407160013755 0ustar tglxtglxcommit b8f8c3cf0a4ac0632ec3f0e15e9dc0c29de917af Author: Thomas Gleixner Date: Fri Jul 18 17:27:28 2008 +0200 nohz: prevent tick stop outside of the idle loop Jack Ren and Eric Miao tracked down the following long standing problem in the NOHZ code: scheduler switch to idle task enable interrupts Window starts here ----> interrupt happens (does not set NEED_RESCHED) irq_exit() stops the tick ----> interrupt happens (does set NEED_RESCHED) return from schedule() cpu_idle(): preempt_disable(); Window ends here The interrupts can happen at any point inside the race window. The first interrupt stops the tick, the second one causes the scheduler to rerun and switch away from idle again and we end up with the tick disabled. The fact that it needs two interrupts where the first one does not set NEED_RESCHED and the second one does made the bug obscure and extremly hard to reproduce and analyse. Kudos to Jack and Eric. Solution: Limit the NOHZ functionality to the idle loop to make sure that we can not run into such a situation ever again. cpu_idle() { preempt_disable(); while(1) { tick_nohz_stop_sched_tick(1); <- tell NOHZ code that we are in the idle loop while (!need_resched()) halt(); tick_nohz_restart_sched_tick(); <- disables NOHZ mode preempt_enable_no_resched(); schedule(); preempt_disable(); } } In hindsight we should have done this forever, but ... /me grabs a large brown paperbag. Debugged-by: Jack Ren , Debugged-by: eric miao Signed-off-by: Thomas Gleixner --- arch/arm/kernel/process.c | 2 +- arch/avr32/kernel/process.c | 2 +- arch/blackfin/kernel/process.c | 2 +- arch/mips/kernel/process.c | 2 +- arch/powerpc/kernel/idle.c | 2 +- arch/powerpc/platforms/iseries/setup.c | 4 ++-- arch/sh/kernel/process_32.c | 2 +- arch/sparc64/kernel/process.c | 2 +- arch/um/kernel/process.c | 2 +- arch/x86/kernel/process_32.c | 2 +- arch/x86/kernel/process_64.c | 2 +- include/linux/tick.h | 5 +++-- kernel/softirq.c | 2 +- kernel/time/tick-sched.c | 12 ++++++++++-- 14 files changed, 26 insertions(+), 17 deletions(-) Index: linux-2.6.26/arch/arm/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/process.c +++ linux-2.6.26/arch/arm/kernel/process.c @@ -164,7 +164,7 @@ void cpu_idle(void) if (!idle) idle = default_idle; leds_event(led_idle_start); - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); while (!need_resched()) idle(); leds_event(led_idle_end); Index: linux-2.6.26/arch/avr32/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/avr32/kernel/process.c +++ linux-2.6.26/arch/avr32/kernel/process.c @@ -31,7 +31,7 @@ void cpu_idle(void) { /* endless idle loop with no priority at all */ while (1) { - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); while (!need_resched()) cpu_idle_sleep(); tick_nohz_restart_sched_tick(); Index: linux-2.6.26/arch/blackfin/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/blackfin/kernel/process.c +++ linux-2.6.26/arch/blackfin/kernel/process.c @@ -105,7 +105,7 @@ void cpu_idle(void) #endif if (!idle) idle = default_idle; - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); while (!need_resched()) idle(); tick_nohz_restart_sched_tick(); Index: linux-2.6.26/arch/mips/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/process.c +++ linux-2.6.26/arch/mips/kernel/process.c @@ -53,7 +53,7 @@ void __noreturn cpu_idle(void) { /* endless idle loop with no priority at all */ while (1) { - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); while (!need_resched()) { #ifdef CONFIG_SMTC_IDLE_HOOK_DEBUG extern void smtc_idle_loop_hook(void); Index: linux-2.6.26/arch/powerpc/kernel/idle.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/idle.c +++ linux-2.6.26/arch/powerpc/kernel/idle.c @@ -60,7 +60,7 @@ void cpu_idle(void) set_thread_flag(TIF_POLLING_NRFLAG); while (1) { - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); while (!need_resched() && !cpu_should_die()) { ppc64_runlatch_off(); Index: linux-2.6.26/arch/powerpc/platforms/iseries/setup.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/iseries/setup.c +++ linux-2.6.26/arch/powerpc/platforms/iseries/setup.c @@ -561,7 +561,7 @@ static void yield_shared_processor(void) static void iseries_shared_idle(void) { while (1) { - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); while (!need_resched() && !hvlpevent_is_pending()) { local_irq_disable(); ppc64_runlatch_off(); @@ -591,7 +591,7 @@ static void iseries_dedicated_idle(void) set_thread_flag(TIF_POLLING_NRFLAG); while (1) { - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); if (!need_resched()) { while (!need_resched()) { ppc64_runlatch_off(); Index: linux-2.6.26/arch/sh/kernel/process_32.c =================================================================== --- linux-2.6.26.orig/arch/sh/kernel/process_32.c +++ linux-2.6.26/arch/sh/kernel/process_32.c @@ -86,7 +86,7 @@ void cpu_idle(void) if (!idle) idle = default_idle; - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); while (!need_resched()) idle(); tick_nohz_restart_sched_tick(); Index: linux-2.6.26/arch/sparc64/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/sparc64/kernel/process.c +++ linux-2.6.26/arch/sparc64/kernel/process.c @@ -97,7 +97,7 @@ void cpu_idle(void) set_thread_flag(TIF_POLLING_NRFLAG); while(1) { - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); while (!need_resched() && !cpu_is_offline(cpu)) sparc64_yield(cpu); Index: linux-2.6.26/arch/um/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/um/kernel/process.c +++ linux-2.6.26/arch/um/kernel/process.c @@ -243,7 +243,7 @@ void default_idle(void) if (need_resched()) schedule(); - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); nsecs = disable_timer(); idle_sleep(nsecs); tick_nohz_restart_sched_tick(); Index: linux-2.6.26/arch/x86/kernel/process_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/process_32.c +++ linux-2.6.26/arch/x86/kernel/process_32.c @@ -166,7 +166,7 @@ void cpu_idle(void) /* endless idle loop with no priority at all */ while (1) { - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); while (!need_resched()) { void (*idle)(void); Index: linux-2.6.26/arch/x86/kernel/process_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/process_64.c +++ linux-2.6.26/arch/x86/kernel/process_64.c @@ -148,7 +148,7 @@ void cpu_idle(void) current_thread_info()->status |= TS_POLLING; /* endless idle loop with no priority at all */ while (1) { - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); while (!need_resched()) { void (*idle)(void); Index: linux-2.6.26/include/linux/tick.h =================================================================== --- linux-2.6.26.orig/include/linux/tick.h +++ linux-2.6.26/include/linux/tick.h @@ -49,6 +49,7 @@ struct tick_sched { unsigned long check_clocks; enum tick_nohz_mode nohz_mode; ktime_t idle_tick; + int inidle; int tick_stopped; unsigned long idle_jiffies; unsigned long idle_calls; @@ -105,14 +106,14 @@ static inline int tick_check_oneshot_cha #endif /* !CONFIG_GENERIC_CLOCKEVENTS */ # ifdef CONFIG_NO_HZ -extern void tick_nohz_stop_sched_tick(void); +extern void tick_nohz_stop_sched_tick(int inidle); extern void tick_nohz_restart_sched_tick(void); extern void tick_nohz_update_jiffies(void); extern ktime_t tick_nohz_get_sleep_length(void); extern void tick_nohz_stop_idle(int cpu); extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); # else -static inline void tick_nohz_stop_sched_tick(void) { } +static inline void tick_nohz_stop_sched_tick(int inidle) { } static inline void tick_nohz_restart_sched_tick(void) { } static inline void tick_nohz_update_jiffies(void) { } static inline ktime_t tick_nohz_get_sleep_length(void) Index: linux-2.6.26/kernel/softirq.c =================================================================== --- linux-2.6.26.orig/kernel/softirq.c +++ linux-2.6.26/kernel/softirq.c @@ -312,7 +312,7 @@ void irq_exit(void) #ifdef CONFIG_NO_HZ /* Make sure that timer wheel updates are propagated */ if (!in_interrupt() && idle_cpu(smp_processor_id()) && !need_resched()) - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(0); rcu_irq_exit(); #endif preempt_enable_no_resched(); Index: linux-2.6.26/kernel/time/tick-sched.c =================================================================== --- linux-2.6.26.orig/kernel/time/tick-sched.c +++ linux-2.6.26/kernel/time/tick-sched.c @@ -188,7 +188,7 @@ u64 get_cpu_idle_time_us(int cpu, u64 *l * Called either from the idle loop or from irq_exit() when an idle period was * just interrupted by an interrupt which did not cause a reschedule. */ -void tick_nohz_stop_sched_tick(void) +void tick_nohz_stop_sched_tick(int inidle) { unsigned long seq, last_jiffies, next_jiffies, delta_jiffies, flags; struct tick_sched *ts; @@ -217,6 +217,11 @@ void tick_nohz_stop_sched_tick(void) if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE)) goto end; + if (!inidle && !ts->inidle) + goto end; + + ts->inidle = 1; + if (need_resched()) goto end; @@ -364,11 +369,14 @@ void tick_nohz_restart_sched_tick(void) local_irq_disable(); tick_nohz_stop_idle(cpu); - if (!ts->tick_stopped) { + if (!ts->inidle || !ts->tick_stopped) { + ts->inidle = 0; local_irq_enable(); return; } + ts->inidle = 0; + rcu_exit_nohz(); /* Update jiffies first */ patches/idle2-fix.patch0000664000076400007640000000143211043407445014043 0ustar tglxtglxcommit e338125b8a886923ba8367207c144764dc352584 Author: Thomas Gleixner Date: Sat Jul 19 09:33:21 2008 +0200 nohz: adjust tick_nohz_stop_sched_tick() call of s390 as well Signed-off-by: Thomas Gleixner --- arch/s390/kernel/process.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/arch/s390/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/s390/kernel/process.c +++ linux-2.6.26/arch/s390/kernel/process.c @@ -170,7 +170,7 @@ static void default_idle(void) void cpu_idle(void) { for (;;) { - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); while (!need_resched()) default_idle(); tick_nohz_restart_sched_tick(); patches/m68knommu_fixes_ontop_of_v2.6.26.patch0000664000076400007640000036205311043677110020232 0ustar tglxtglxdiff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig index 8e84415..32c2ee8 100644 --- a/arch/m68knommu/Kconfig +++ b/arch/m68knommu/Kconfig @@ -58,10 +58,18 @@ config GENERIC_TIME bool default y +config GENERIC_CMOS_UPDATE + bool + default y + config TIME_LOW_RES bool default y +config GENERIC_CLOCKEVENTS + bool + default n + config NO_IOPORT def_bool y @@ -108,11 +116,14 @@ config M5206e config M520x bool "MCF520x" + select GENERIC_CLOCKEVENTS help Freescale Coldfire 5207/5208 processor support. config M523x bool "MCF523x" + select GENERIC_CLOCKEVENTS + select GENERIC_HARDIRQS_NO__DO_IRQ help Freescale Coldfire 5230/1/2/4/5 processor support @@ -138,6 +149,7 @@ config M5275 config M528x bool "MCF528x" + select GENERIC_CLOCKEVENTS help Motorola ColdFire 5280/5282 processor support. @@ -161,6 +173,7 @@ endchoice config M527x bool depends on (M5271 || M5275) + select GENERIC_CLOCKEVENTS default y config COLDFIRE @@ -671,9 +684,15 @@ config ROMKERNEL endchoice +config GENERIC_HARDIRQS_NO__DO_IRQ + bool "Force generic IRQ implementation" + if COLDFIRE source "kernel/Kconfig.preempt" endif + +source "kernel/time/Kconfig" + source "mm/Kconfig" endmenu diff --git a/arch/m68knommu/Makefile b/arch/m68knommu/Makefile index e0b5f62..b63bbcf 100644 --- a/arch/m68knommu/Makefile +++ b/arch/m68knommu/Makefile @@ -8,6 +8,8 @@ # (C) Copyright 2002, Greg Ungerer # +KBUILD_DEFCONFIG := m5208evb_defconfig + platform-$(CONFIG_M68328) := 68328 platform-$(CONFIG_M68EZ328) := 68EZ328 platform-$(CONFIG_M68VZ328) := 68VZ328 @@ -90,13 +92,14 @@ export PLATFORM BOARD MODEL CPUCLASS cflags-$(CONFIG_M5206) := -m5200 cflags-$(CONFIG_M5206e) := -m5200 cflags-$(CONFIG_M520x) := -m5307 -cflags-$(CONFIG_M523x) := -m5307 +cflags-$(CONFIG_M523x) := $(call cc-option,-mcpu=523x,-m5307) cflags-$(CONFIG_M5249) := -m5200 -cflags-$(CONFIG_M527x) := -m5307 +cflags-$(CONFIG_M5271) := $(call cc-option,-mcpu=5271,-m5307) cflags-$(CONFIG_M5272) := -m5307 -cflags-$(CONFIG_M528x) := -m5307 +cflags-$(CONFIG_M5275) := $(call cc-option,-mcpu=5275,-m5307) +cflags-$(CONFIG_M528x) := $(call cc-option,-m528x,-m5307) cflags-$(CONFIG_M5307) := -m5307 -cflags-$(CONFIG_M532x) := -m5307 +cflags-$(CONFIG_M532x) := $(call cc-option,-mcpu=532x,-m5307) cflags-$(CONFIG_M5407) := -m5200 cflags-$(CONFIG_M68328) := -m68000 cflags-$(CONFIG_M68EZ328) := -m68000 diff --git a/arch/m68knommu/configs/m5208evb_defconfig b/arch/m68knommu/configs/m5208evb_defconfig new file mode 100644 index 0000000..6fae33a --- /dev/null +++ b/arch/m68knommu/configs/m5208evb_defconfig @@ -0,0 +1,610 @@ +# +# Automatically generated make config: don't edit +# Linux kernel version: 2.6.26-rc1 +# +CONFIG_M68K=y +# CONFIG_MMU is not set +# CONFIG_FPU is not set +CONFIG_ZONE_DMA=y +CONFIG_RWSEM_GENERIC_SPINLOCK=y +# CONFIG_RWSEM_XCHGADD_ALGORITHM is not set +# CONFIG_ARCH_HAS_ILOG2_U32 is not set +# CONFIG_ARCH_HAS_ILOG2_U64 is not set +CONFIG_GENERIC_FIND_NEXT_BIT=y +CONFIG_GENERIC_HWEIGHT=y +CONFIG_GENERIC_HARDIRQS=y +CONFIG_GENERIC_CALIBRATE_DELAY=y +CONFIG_GENERIC_TIME=y +CONFIG_TIME_LOW_RES=y +CONFIG_NO_IOPORT=y +CONFIG_ARCH_SUPPORTS_AOUT=y +CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config" + +# +# General setup +# +CONFIG_EXPERIMENTAL=y +CONFIG_BROKEN_ON_SMP=y +CONFIG_INIT_ENV_ARG_LIMIT=32 +CONFIG_LOCALVERSION="" +CONFIG_LOCALVERSION_AUTO=y +# CONFIG_SYSVIPC is not set +# CONFIG_POSIX_MQUEUE is not set +# CONFIG_BSD_PROCESS_ACCT is not set +# CONFIG_TASKSTATS is not set +# CONFIG_AUDIT is not set +# CONFIG_IKCONFIG is not set +CONFIG_LOG_BUF_SHIFT=14 +# CONFIG_CGROUPS is not set +# CONFIG_GROUP_SCHED is not set +# CONFIG_RELAY is not set +# CONFIG_NAMESPACES is not set +# CONFIG_BLK_DEV_INITRD is not set +# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set +CONFIG_SYSCTL=y +CONFIG_EMBEDDED=y +# CONFIG_UID16 is not set +# CONFIG_SYSCTL_SYSCALL is not set +# CONFIG_KALLSYMS is not set +# CONFIG_HOTPLUG is not set +CONFIG_PRINTK=y +CONFIG_BUG=y +CONFIG_ELF_CORE=y +# CONFIG_COMPAT_BRK is not set +CONFIG_BASE_FULL=y +# CONFIG_FUTEX is not set +# CONFIG_EPOLL is not set +# CONFIG_SIGNALFD is not set +# CONFIG_TIMERFD is not set +# CONFIG_EVENTFD is not set +# CONFIG_VM_EVENT_COUNTERS is not set +CONFIG_SLAB=y +# CONFIG_SLUB is not set +# CONFIG_SLOB is not set +# CONFIG_PROFILING is not set +# CONFIG_MARKERS is not set +# CONFIG_HAVE_OPROFILE is not set +# CONFIG_HAVE_KPROBES is not set +# CONFIG_HAVE_KRETPROBES is not set +# CONFIG_HAVE_DMA_ATTRS is not set +CONFIG_SLABINFO=y +CONFIG_TINY_SHMEM=y +CONFIG_BASE_SMALL=0 +CONFIG_MODULES=y +CONFIG_MODULE_UNLOAD=y +# CONFIG_MODULE_FORCE_UNLOAD is not set +# CONFIG_MODVERSIONS is not set +# CONFIG_MODULE_SRCVERSION_ALL is not set +# CONFIG_KMOD is not set +CONFIG_BLOCK=y +# CONFIG_LBD is not set +# CONFIG_LSF is not set +# CONFIG_BLK_DEV_BSG is not set + +# +# IO Schedulers +# +CONFIG_IOSCHED_NOOP=y +# CONFIG_IOSCHED_AS is not set +# CONFIG_IOSCHED_DEADLINE is not set +# CONFIG_IOSCHED_CFQ is not set +# CONFIG_DEFAULT_AS is not set +# CONFIG_DEFAULT_DEADLINE is not set +# CONFIG_DEFAULT_CFQ is not set +CONFIG_DEFAULT_NOOP=y +CONFIG_DEFAULT_IOSCHED="noop" +CONFIG_CLASSIC_RCU=y + +# +# Processor type and features +# +# CONFIG_M68328 is not set +# CONFIG_M68EZ328 is not set +# CONFIG_M68VZ328 is not set +# CONFIG_M68360 is not set +# CONFIG_M5206 is not set +# CONFIG_M5206e is not set +CONFIG_M520x=y +# CONFIG_M523x is not set +# CONFIG_M5249 is not set +# CONFIG_M5271 is not set +# CONFIG_M5272 is not set +# CONFIG_M5275 is not set +# CONFIG_M528x is not set +# CONFIG_M5307 is not set +# CONFIG_M532x is not set +# CONFIG_M5407 is not set +CONFIG_COLDFIRE=y +CONFIG_CLOCK_SET=y +CONFIG_CLOCK_FREQ=166666666 +CONFIG_CLOCK_DIV=2 + +# +# Platform +# +CONFIG_M5208EVB=y +CONFIG_FREESCALE=y +# CONFIG_4KSTACKS is not set +CONFIG_HZ=100 + +# +# RAM configuration +# +CONFIG_RAMBASE=0x40000000 +CONFIG_RAMSIZE=0x2000000 +CONFIG_VECTORBASE=0x40000000 +CONFIG_KERNELBASE=0x40020000 +# CONFIG_RAMAUTOBIT is not set +# CONFIG_RAM8BIT is not set +CONFIG_RAM16BIT=y +# CONFIG_RAM32BIT is not set + +# +# ROM configuration +# +# CONFIG_ROM is not set +CONFIG_RAMKERNEL=y +# CONFIG_ROMKERNEL is not set +CONFIG_SELECT_MEMORY_MODEL=y +CONFIG_FLATMEM_MANUAL=y +# CONFIG_DISCONTIGMEM_MANUAL is not set +# CONFIG_SPARSEMEM_MANUAL is not set +CONFIG_FLATMEM=y +CONFIG_FLAT_NODE_MEM_MAP=y +# CONFIG_SPARSEMEM_STATIC is not set +# CONFIG_SPARSEMEM_VMEMMAP_ENABLE is not set +CONFIG_PAGEFLAGS_EXTENDED=y +CONFIG_SPLIT_PTLOCK_CPUS=4 +# CONFIG_RESOURCES_64BIT is not set +CONFIG_ZONE_DMA_FLAG=1 +CONFIG_VIRT_TO_BUS=y +CONFIG_ISA_DMA_API=y + +# +# Bus options (PCI, PCMCIA, EISA, MCA, ISA) +# +# CONFIG_PCI is not set +# CONFIG_ARCH_SUPPORTS_MSI is not set + +# +# Executable file formats +# +CONFIG_BINFMT_FLAT=y +# CONFIG_BINFMT_ZFLAT is not set +# CONFIG_BINFMT_SHARED_FLAT is not set +# CONFIG_BINFMT_AOUT is not set +# CONFIG_BINFMT_MISC is not set + +# +# Power management options +# +# CONFIG_PM is not set + +# +# Networking +# +CONFIG_NET=y + +# +# Networking options +# +CONFIG_PACKET=y +# CONFIG_PACKET_MMAP is not set +CONFIG_UNIX=y +# CONFIG_NET_KEY is not set +CONFIG_INET=y +# CONFIG_IP_MULTICAST is not set +# CONFIG_IP_ADVANCED_ROUTER is not set +CONFIG_IP_FIB_HASH=y +# CONFIG_IP_PNP is not set +# CONFIG_NET_IPIP is not set +# CONFIG_NET_IPGRE is not set +# CONFIG_ARPD is not set +# CONFIG_SYN_COOKIES is not set +# CONFIG_INET_AH is not set +# CONFIG_INET_ESP is not set +# CONFIG_INET_IPCOMP is not set +# CONFIG_INET_XFRM_TUNNEL is not set +# CONFIG_INET_TUNNEL is not set +# CONFIG_INET_XFRM_MODE_TRANSPORT is not set +# CONFIG_INET_XFRM_MODE_TUNNEL is not set +# CONFIG_INET_XFRM_MODE_BEET is not set +# CONFIG_INET_LRO is not set +# CONFIG_INET_DIAG is not set +# CONFIG_TCP_CONG_ADVANCED is not set +CONFIG_TCP_CONG_CUBIC=y +CONFIG_DEFAULT_TCP_CONG="cubic" +# CONFIG_TCP_MD5SIG is not set +# CONFIG_IPV6 is not set +# CONFIG_NETWORK_SECMARK is not set +# CONFIG_NETFILTER is not set +# CONFIG_IP_DCCP is not set +# CONFIG_IP_SCTP is not set +# CONFIG_TIPC is not set +# CONFIG_ATM is not set +# CONFIG_BRIDGE is not set +# CONFIG_VLAN_8021Q is not set +# CONFIG_DECNET is not set +# CONFIG_LLC2 is not set +# CONFIG_IPX is not set +# CONFIG_ATALK is not set +# CONFIG_X25 is not set +# CONFIG_LAPB is not set +# CONFIG_ECONET is not set +# CONFIG_WAN_ROUTER is not set +# CONFIG_NET_SCHED is not set + +# +# Network testing +# +# CONFIG_NET_PKTGEN is not set +# CONFIG_HAMRADIO is not set +# CONFIG_CAN is not set +# CONFIG_IRDA is not set +# CONFIG_BT is not set +# CONFIG_AF_RXRPC is not set + +# +# Wireless +# +# CONFIG_CFG80211 is not set +# CONFIG_WIRELESS_EXT is not set +# CONFIG_MAC80211 is not set +# CONFIG_IEEE80211 is not set +# CONFIG_RFKILL is not set +# CONFIG_NET_9P is not set + +# +# Device Drivers +# + +# +# Generic Driver Options +# +CONFIG_STANDALONE=y +CONFIG_PREVENT_FIRMWARE_BUILD=y +# CONFIG_SYS_HYPERVISOR is not set +# CONFIG_CONNECTOR is not set +CONFIG_MTD=y +# CONFIG_MTD_DEBUG is not set +# CONFIG_MTD_CONCAT is not set +CONFIG_MTD_PARTITIONS=y +# CONFIG_MTD_REDBOOT_PARTS is not set +# CONFIG_MTD_CMDLINE_PARTS is not set +# CONFIG_MTD_AR7_PARTS is not set + +# +# User Modules And Translation Layers +# +CONFIG_MTD_CHAR=y +CONFIG_MTD_BLKDEVS=y +CONFIG_MTD_BLOCK=y +# CONFIG_FTL is not set +# CONFIG_NFTL is not set +# CONFIG_INFTL is not set +# CONFIG_RFD_FTL is not set +# CONFIG_SSFDC is not set +# CONFIG_MTD_OOPS is not set + +# +# RAM/ROM/Flash chip drivers +# +CONFIG_MTD_CFI=y +# CONFIG_MTD_JEDECPROBE is not set +CONFIG_MTD_GEN_PROBE=y +# CONFIG_MTD_CFI_ADV_OPTIONS is not set +CONFIG_MTD_MAP_BANK_WIDTH_1=y +CONFIG_MTD_MAP_BANK_WIDTH_2=y +CONFIG_MTD_MAP_BANK_WIDTH_4=y +# CONFIG_MTD_MAP_BANK_WIDTH_8 is not set +# CONFIG_MTD_MAP_BANK_WIDTH_16 is not set +# CONFIG_MTD_MAP_BANK_WIDTH_32 is not set +CONFIG_MTD_CFI_I1=y +CONFIG_MTD_CFI_I2=y +# CONFIG_MTD_CFI_I4 is not set +# CONFIG_MTD_CFI_I8 is not set +# CONFIG_MTD_CFI_INTELEXT is not set +CONFIG_MTD_CFI_AMDSTD=y +# CONFIG_MTD_CFI_STAA is not set +CONFIG_MTD_CFI_UTIL=y +CONFIG_MTD_RAM=y +# CONFIG_MTD_ROM is not set +# CONFIG_MTD_ABSENT is not set + +# +# Mapping drivers for chip access +# +# CONFIG_MTD_COMPLEX_MAPPINGS is not set +# CONFIG_MTD_PHYSMAP is not set +CONFIG_MTD_UCLINUX=y +# CONFIG_MTD_PLATRAM is not set + +# +# Self-contained MTD device drivers +# +# CONFIG_MTD_SLRAM is not set +# CONFIG_MTD_PHRAM is not set +# CONFIG_MTD_MTDRAM is not set +# CONFIG_MTD_BLOCK2MTD is not set + +# +# Disk-On-Chip Device Drivers +# +# CONFIG_MTD_DOC2000 is not set +# CONFIG_MTD_DOC2001 is not set +# CONFIG_MTD_DOC2001PLUS is not set +# CONFIG_MTD_NAND is not set +# CONFIG_MTD_ONENAND is not set + +# +# UBI - Unsorted block images +# +# CONFIG_MTD_UBI is not set +# CONFIG_PARPORT is not set +CONFIG_BLK_DEV=y +# CONFIG_BLK_DEV_COW_COMMON is not set +# CONFIG_BLK_DEV_LOOP is not set +# CONFIG_BLK_DEV_NBD is not set +CONFIG_BLK_DEV_RAM=y +CONFIG_BLK_DEV_RAM_COUNT=16 +CONFIG_BLK_DEV_RAM_SIZE=4096 +# CONFIG_BLK_DEV_XIP is not set +# CONFIG_CDROM_PKTCDVD is not set +# CONFIG_ATA_OVER_ETH is not set +# CONFIG_MISC_DEVICES is not set +CONFIG_HAVE_IDE=y +# CONFIG_IDE is not set + +# +# SCSI device support +# +# CONFIG_RAID_ATTRS is not set +# CONFIG_SCSI is not set +# CONFIG_SCSI_DMA is not set +# CONFIG_SCSI_NETLINK is not set +# CONFIG_MD is not set +CONFIG_NETDEVICES=y +# CONFIG_NETDEVICES_MULTIQUEUE is not set +# CONFIG_DUMMY is not set +# CONFIG_BONDING is not set +# CONFIG_MACVLAN is not set +# CONFIG_EQUALIZER is not set +# CONFIG_TUN is not set +# CONFIG_VETH is not set +# CONFIG_PHYLIB is not set +CONFIG_NET_ETHERNET=y +# CONFIG_MII is not set +# CONFIG_IBM_NEW_EMAC_ZMII is not set +# CONFIG_IBM_NEW_EMAC_RGMII is not set +# CONFIG_IBM_NEW_EMAC_TAH is not set +# CONFIG_IBM_NEW_EMAC_EMAC4 is not set +# CONFIG_B44 is not set +CONFIG_FEC=y +# CONFIG_FEC2 is not set +# CONFIG_NETDEV_1000 is not set +# CONFIG_NETDEV_10000 is not set + +# +# Wireless LAN +# +# CONFIG_WLAN_PRE80211 is not set +# CONFIG_WLAN_80211 is not set +# CONFIG_IWLWIFI is not set +# CONFIG_IWLWIFI_LEDS is not set +# CONFIG_WAN is not set +# CONFIG_PPP is not set +# CONFIG_SLIP is not set +# CONFIG_NETCONSOLE is not set +# CONFIG_NETPOLL is not set +# CONFIG_NET_POLL_CONTROLLER is not set +# CONFIG_ISDN is not set +# CONFIG_PHONE is not set + +# +# Input device support +# +# CONFIG_INPUT is not set + +# +# Hardware I/O ports +# +# CONFIG_SERIO is not set +# CONFIG_GAMEPORT is not set + +# +# Character devices +# +# CONFIG_VT is not set +# CONFIG_DEVKMEM is not set +# CONFIG_SERIAL_NONSTANDARD is not set + +# +# Serial drivers +# +# CONFIG_SERIAL_8250 is not set + +# +# Non-8250 serial port support +# +CONFIG_SERIAL_CORE=y +CONFIG_SERIAL_CORE_CONSOLE=y +# CONFIG_SERIAL_COLDFIRE is not set +CONFIG_SERIAL_MCF=y +CONFIG_SERIAL_MCF_BAUDRATE=115200 +CONFIG_SERIAL_MCF_CONSOLE=y +# CONFIG_UNIX98_PTYS is not set +CONFIG_LEGACY_PTYS=y +CONFIG_LEGACY_PTY_COUNT=256 +# CONFIG_IPMI_HANDLER is not set +# CONFIG_HW_RANDOM is not set +# CONFIG_GEN_RTC is not set +# CONFIG_R3964 is not set +# CONFIG_RAW_DRIVER is not set +# CONFIG_TCG_TPM is not set +# CONFIG_I2C is not set +# CONFIG_SPI is not set +# CONFIG_W1 is not set +# CONFIG_POWER_SUPPLY is not set +# CONFIG_HWMON is not set +# CONFIG_THERMAL is not set +# CONFIG_WATCHDOG is not set + +# +# Sonics Silicon Backplane +# +CONFIG_SSB_POSSIBLE=y +# CONFIG_SSB is not set + +# +# Multifunction device drivers +# +# CONFIG_MFD_SM501 is not set +# CONFIG_HTC_PASIC3 is not set + +# +# Multimedia devices +# + +# +# Multimedia core support +# +# CONFIG_VIDEO_DEV is not set +# CONFIG_DVB_CORE is not set + +# +# Multimedia drivers +# +# CONFIG_DAB is not set + +# +# Graphics support +# +# CONFIG_VGASTATE is not set +# CONFIG_VIDEO_OUTPUT_CONTROL is not set +# CONFIG_FB is not set +# CONFIG_BACKLIGHT_LCD_SUPPORT is not set + +# +# Display device support +# +# CONFIG_DISPLAY_SUPPORT is not set + +# +# Sound +# +# CONFIG_SOUND is not set +# CONFIG_USB_SUPPORT is not set +# CONFIG_MMC is not set +# CONFIG_MEMSTICK is not set +# CONFIG_NEW_LEDS is not set +# CONFIG_ACCESSIBILITY is not set +# CONFIG_RTC_CLASS is not set +# CONFIG_UIO is not set + +# +# File systems +# +CONFIG_EXT2_FS=y +# CONFIG_EXT2_FS_XATTR is not set +# CONFIG_EXT3_FS is not set +# CONFIG_EXT4DEV_FS is not set +# CONFIG_REISERFS_FS is not set +# CONFIG_JFS_FS is not set +# CONFIG_FS_POSIX_ACL is not set +# CONFIG_XFS_FS is not set +# CONFIG_DNOTIFY is not set +# CONFIG_INOTIFY is not set +# CONFIG_QUOTA is not set +# CONFIG_AUTOFS_FS is not set +# CONFIG_AUTOFS4_FS is not set +# CONFIG_FUSE_FS is not set + +# +# CD-ROM/DVD Filesystems +# +# CONFIG_ISO9660_FS is not set +# CONFIG_UDF_FS is not set + +# +# DOS/FAT/NT Filesystems +# +# CONFIG_MSDOS_FS is not set +# CONFIG_VFAT_FS is not set +# CONFIG_NTFS_FS is not set + +# +# Pseudo filesystems +# +CONFIG_PROC_FS=y +CONFIG_PROC_SYSCTL=y +# CONFIG_SYSFS is not set +# CONFIG_TMPFS is not set +# CONFIG_HUGETLB_PAGE is not set + +# +# Miscellaneous filesystems +# +# CONFIG_ADFS_FS is not set +# CONFIG_AFFS_FS is not set +# CONFIG_HFS_FS is not set +# CONFIG_HFSPLUS_FS is not set +# CONFIG_BEFS_FS is not set +# CONFIG_BFS_FS is not set +# CONFIG_EFS_FS is not set +# CONFIG_JFFS2_FS is not set +# CONFIG_CRAMFS is not set +# CONFIG_VXFS_FS is not set +# CONFIG_MINIX_FS is not set +# CONFIG_HPFS_FS is not set +# CONFIG_QNX4FS_FS is not set +CONFIG_ROMFS_FS=y +# CONFIG_SYSV_FS is not set +# CONFIG_UFS_FS is not set +# CONFIG_NETWORK_FILESYSTEMS is not set + +# +# Partition Types +# +# CONFIG_PARTITION_ADVANCED is not set +CONFIG_MSDOS_PARTITION=y +# CONFIG_NLS is not set + +# +# Kernel hacking +# +# CONFIG_PRINTK_TIME is not set +CONFIG_ENABLE_WARN_DEPRECATED=y +CONFIG_ENABLE_MUST_CHECK=y +CONFIG_FRAME_WARN=1024 +# CONFIG_MAGIC_SYSRQ is not set +# CONFIG_UNUSED_SYMBOLS is not set +# CONFIG_HEADERS_CHECK is not set +# CONFIG_DEBUG_KERNEL is not set +# CONFIG_DEBUG_BUGVERBOSE is not set +# CONFIG_SAMPLES is not set +CONFIG_FULLDEBUG=y +# CONFIG_HIGHPROFILE is not set +# CONFIG_BOOTPARAM is not set +# CONFIG_NO_KERNEL_MSG is not set +# CONFIG_BDM_DISABLE is not set + +# +# Security options +# +# CONFIG_KEYS is not set +# CONFIG_SECURITY_FILE_CAPABILITIES is not set +# CONFIG_CRYPTO is not set + +# +# Library routines +# +CONFIG_BITREVERSE=y +# CONFIG_GENERIC_FIND_FIRST_BIT is not set +# CONFIG_CRC_CCITT is not set +# CONFIG_CRC16 is not set +# CONFIG_CRC_ITU_T is not set +CONFIG_CRC32=y +# CONFIG_CRC7 is not set +# CONFIG_LIBCRC32C is not set +CONFIG_HAS_IOMEM=y +CONFIG_HAS_DMA=y diff --git a/arch/m68knommu/configs/m5249evb_defconfig b/arch/m68knommu/configs/m5249evb_defconfig new file mode 100644 index 0000000..cc64583 --- /dev/null +++ b/arch/m68knommu/configs/m5249evb_defconfig @@ -0,0 +1,497 @@ +# +# Automatically generated make config: don't edit +# Linux kernel version: 2.6.26-rc1 +# +CONFIG_M68K=y +# CONFIG_MMU is not set +# CONFIG_FPU is not set +CONFIG_ZONE_DMA=y +CONFIG_RWSEM_GENERIC_SPINLOCK=y +# CONFIG_RWSEM_XCHGADD_ALGORITHM is not set +# CONFIG_ARCH_HAS_ILOG2_U32 is not set +# CONFIG_ARCH_HAS_ILOG2_U64 is not set +CONFIG_GENERIC_FIND_NEXT_BIT=y +CONFIG_GENERIC_HWEIGHT=y +CONFIG_GENERIC_HARDIRQS=y +CONFIG_GENERIC_CALIBRATE_DELAY=y +CONFIG_GENERIC_TIME=y +CONFIG_TIME_LOW_RES=y +CONFIG_NO_IOPORT=y +CONFIG_ARCH_SUPPORTS_AOUT=y +CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config" + +# +# General setup +# +CONFIG_EXPERIMENTAL=y +CONFIG_BROKEN_ON_SMP=y +CONFIG_INIT_ENV_ARG_LIMIT=32 +CONFIG_LOCALVERSION="" +CONFIG_LOCALVERSION_AUTO=y +# CONFIG_SYSVIPC is not set +# CONFIG_BSD_PROCESS_ACCT is not set +# CONFIG_IKCONFIG is not set +CONFIG_LOG_BUF_SHIFT=14 +# CONFIG_CGROUPS is not set +# CONFIG_GROUP_SCHED is not set +# CONFIG_SYSFS_DEPRECATED_V2 is not set +# CONFIG_RELAY is not set +# CONFIG_NAMESPACES is not set +# CONFIG_BLK_DEV_INITRD is not set +# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set +CONFIG_SYSCTL=y +CONFIG_EMBEDDED=y +# CONFIG_UID16 is not set +# CONFIG_SYSCTL_SYSCALL is not set +# CONFIG_KALLSYMS is not set +# CONFIG_HOTPLUG is not set +CONFIG_PRINTK=y +CONFIG_BUG=y +CONFIG_ELF_CORE=y +# CONFIG_COMPAT_BRK is not set +CONFIG_BASE_FULL=y +# CONFIG_FUTEX is not set +# CONFIG_EPOLL is not set +# CONFIG_SIGNALFD is not set +# CONFIG_TIMERFD is not set +# CONFIG_EVENTFD is not set +# CONFIG_VM_EVENT_COUNTERS is not set +CONFIG_SLAB=y +# CONFIG_SLUB is not set +# CONFIG_SLOB is not set +# CONFIG_PROFILING is not set +# CONFIG_MARKERS is not set +# CONFIG_HAVE_OPROFILE is not set +# CONFIG_HAVE_KPROBES is not set +# CONFIG_HAVE_KRETPROBES is not set +# CONFIG_HAVE_DMA_ATTRS is not set +CONFIG_SLABINFO=y +CONFIG_TINY_SHMEM=y +CONFIG_BASE_SMALL=0 +CONFIG_MODULES=y +CONFIG_MODULE_UNLOAD=y +# CONFIG_MODULE_FORCE_UNLOAD is not set +# CONFIG_MODVERSIONS is not set +# CONFIG_MODULE_SRCVERSION_ALL is not set +# CONFIG_KMOD is not set +CONFIG_BLOCK=y +# CONFIG_LBD is not set +# CONFIG_BLK_DEV_IO_TRACE is not set +# CONFIG_LSF is not set +# CONFIG_BLK_DEV_BSG is not set + +# +# IO Schedulers +# +CONFIG_IOSCHED_NOOP=y +# CONFIG_IOSCHED_AS is not set +# CONFIG_IOSCHED_DEADLINE is not set +# CONFIG_IOSCHED_CFQ is not set +# CONFIG_DEFAULT_AS is not set +# CONFIG_DEFAULT_DEADLINE is not set +# CONFIG_DEFAULT_CFQ is not set +CONFIG_DEFAULT_NOOP=y +CONFIG_DEFAULT_IOSCHED="noop" +CONFIG_CLASSIC_RCU=y + +# +# Processor type and features +# +# CONFIG_M68328 is not set +# CONFIG_M68EZ328 is not set +# CONFIG_M68VZ328 is not set +# CONFIG_M68360 is not set +# CONFIG_M5206 is not set +# CONFIG_M5206e is not set +# CONFIG_M520x is not set +# CONFIG_M523x is not set +CONFIG_M5249=y +# CONFIG_M5271 is not set +# CONFIG_M5272 is not set +# CONFIG_M5275 is not set +# CONFIG_M528x is not set +# CONFIG_M5307 is not set +# CONFIG_M532x is not set +# CONFIG_M5407 is not set +CONFIG_COLDFIRE=y +CONFIG_CLOCK_SET=y +CONFIG_CLOCK_FREQ=140000000 +CONFIG_CLOCK_DIV=2 + +# +# Platform +# +CONFIG_M5249C3=y +CONFIG_FREESCALE=y +CONFIG_4KSTACKS=y +CONFIG_HZ=100 + +# +# RAM configuration +# +CONFIG_RAMBASE=0x00000000 +CONFIG_RAMSIZE=0x00800000 +CONFIG_VECTORBASE=0x00000000 +CONFIG_KERNELBASE=0x00020000 +CONFIG_RAMAUTOBIT=y +# CONFIG_RAM8BIT is not set +# CONFIG_RAM16BIT is not set +# CONFIG_RAM32BIT is not set + +# +# ROM configuration +# +# CONFIG_ROM is not set +CONFIG_RAMKERNEL=y +# CONFIG_ROMKERNEL is not set +CONFIG_SELECT_MEMORY_MODEL=y +CONFIG_FLATMEM_MANUAL=y +# CONFIG_DISCONTIGMEM_MANUAL is not set +# CONFIG_SPARSEMEM_MANUAL is not set +CONFIG_FLATMEM=y +CONFIG_FLAT_NODE_MEM_MAP=y +# CONFIG_SPARSEMEM_STATIC is not set +# CONFIG_SPARSEMEM_VMEMMAP_ENABLE is not set +CONFIG_PAGEFLAGS_EXTENDED=y +CONFIG_SPLIT_PTLOCK_CPUS=4 +# CONFIG_RESOURCES_64BIT is not set +CONFIG_ZONE_DMA_FLAG=1 +CONFIG_VIRT_TO_BUS=y +CONFIG_ISA_DMA_API=y + +# +# Bus options (PCI, PCMCIA, EISA, MCA, ISA) +# +# CONFIG_PCI is not set +# CONFIG_ARCH_SUPPORTS_MSI is not set + +# +# Executable file formats +# +CONFIG_BINFMT_FLAT=y +# CONFIG_BINFMT_ZFLAT is not set +# CONFIG_BINFMT_SHARED_FLAT is not set +# CONFIG_BINFMT_AOUT is not set +# CONFIG_BINFMT_MISC is not set + +# +# Power management options +# +# CONFIG_PM is not set + +# +# Networking +# +# CONFIG_NET is not set + +# +# Device Drivers +# + +# +# Generic Driver Options +# +CONFIG_STANDALONE=y +CONFIG_PREVENT_FIRMWARE_BUILD=y +# CONFIG_SYS_HYPERVISOR is not set +CONFIG_MTD=y +# CONFIG_MTD_DEBUG is not set +# CONFIG_MTD_CONCAT is not set +CONFIG_MTD_PARTITIONS=y +# CONFIG_MTD_REDBOOT_PARTS is not set +# CONFIG_MTD_CMDLINE_PARTS is not set +# CONFIG_MTD_AR7_PARTS is not set + +# +# User Modules And Translation Layers +# +CONFIG_MTD_CHAR=y +CONFIG_MTD_BLKDEVS=y +CONFIG_MTD_BLOCK=y +# CONFIG_FTL is not set +# CONFIG_NFTL is not set +# CONFIG_INFTL is not set +# CONFIG_RFD_FTL is not set +# CONFIG_SSFDC is not set +# CONFIG_MTD_OOPS is not set + +# +# RAM/ROM/Flash chip drivers +# +# CONFIG_MTD_CFI is not set +# CONFIG_MTD_JEDECPROBE is not set +CONFIG_MTD_MAP_BANK_WIDTH_1=y +CONFIG_MTD_MAP_BANK_WIDTH_2=y +CONFIG_MTD_MAP_BANK_WIDTH_4=y +# CONFIG_MTD_MAP_BANK_WIDTH_8 is not set +# CONFIG_MTD_MAP_BANK_WIDTH_16 is not set +# CONFIG_MTD_MAP_BANK_WIDTH_32 is not set +CONFIG_MTD_CFI_I1=y +CONFIG_MTD_CFI_I2=y +# CONFIG_MTD_CFI_I4 is not set +# CONFIG_MTD_CFI_I8 is not set +CONFIG_MTD_RAM=y +# CONFIG_MTD_ROM is not set +# CONFIG_MTD_ABSENT is not set + +# +# Mapping drivers for chip access +# +# CONFIG_MTD_COMPLEX_MAPPINGS is not set +CONFIG_MTD_UCLINUX=y +# CONFIG_MTD_PLATRAM is not set + +# +# Self-contained MTD device drivers +# +# CONFIG_MTD_SLRAM is not set +# CONFIG_MTD_PHRAM is not set +# CONFIG_MTD_MTDRAM is not set +# CONFIG_MTD_BLOCK2MTD is not set + +# +# Disk-On-Chip Device Drivers +# +# CONFIG_MTD_DOC2000 is not set +# CONFIG_MTD_DOC2001 is not set +# CONFIG_MTD_DOC2001PLUS is not set +# CONFIG_MTD_NAND is not set +# CONFIG_MTD_ONENAND is not set + +# +# UBI - Unsorted block images +# +# CONFIG_MTD_UBI is not set +# CONFIG_PARPORT is not set +CONFIG_BLK_DEV=y +# CONFIG_BLK_DEV_COW_COMMON is not set +# CONFIG_BLK_DEV_LOOP is not set +CONFIG_BLK_DEV_RAM=y +CONFIG_BLK_DEV_RAM_COUNT=16 +CONFIG_BLK_DEV_RAM_SIZE=4096 +# CONFIG_BLK_DEV_XIP is not set +# CONFIG_CDROM_PKTCDVD is not set +CONFIG_MISC_DEVICES=y +# CONFIG_EEPROM_93CX6 is not set +# CONFIG_ENCLOSURE_SERVICES is not set +CONFIG_HAVE_IDE=y +# CONFIG_IDE is not set + +# +# SCSI device support +# +# CONFIG_RAID_ATTRS is not set +# CONFIG_SCSI is not set +# CONFIG_SCSI_DMA is not set +# CONFIG_SCSI_NETLINK is not set +# CONFIG_MD is not set +# CONFIG_PHONE is not set + +# +# Input device support +# +# CONFIG_INPUT is not set + +# +# Hardware I/O ports +# +# CONFIG_SERIO is not set +# CONFIG_GAMEPORT is not set + +# +# Character devices +# +# CONFIG_VT is not set +# CONFIG_DEVKMEM is not set +# CONFIG_SERIAL_NONSTANDARD is not set + +# +# Serial drivers +# +# CONFIG_SERIAL_8250 is not set + +# +# Non-8250 serial port support +# +CONFIG_SERIAL_CORE=y +CONFIG_SERIAL_CORE_CONSOLE=y +# CONFIG_SERIAL_COLDFIRE is not set +CONFIG_SERIAL_MCF=y +CONFIG_SERIAL_MCF_BAUDRATE=19200 +CONFIG_SERIAL_MCF_CONSOLE=y +# CONFIG_UNIX98_PTYS is not set +CONFIG_LEGACY_PTYS=y +CONFIG_LEGACY_PTY_COUNT=256 +# CONFIG_IPMI_HANDLER is not set +# CONFIG_HW_RANDOM is not set +# CONFIG_GEN_RTC is not set +# CONFIG_R3964 is not set +# CONFIG_RAW_DRIVER is not set +# CONFIG_TCG_TPM is not set +# CONFIG_I2C is not set +# CONFIG_SPI is not set +# CONFIG_W1 is not set +# CONFIG_POWER_SUPPLY is not set +# CONFIG_HWMON is not set +# CONFIG_THERMAL is not set +# CONFIG_WATCHDOG is not set + +# +# Sonics Silicon Backplane +# +CONFIG_SSB_POSSIBLE=y +# CONFIG_SSB is not set + +# +# Multifunction device drivers +# +# CONFIG_MFD_SM501 is not set +# CONFIG_HTC_PASIC3 is not set + +# +# Multimedia devices +# + +# +# Multimedia core support +# +# CONFIG_VIDEO_DEV is not set + +# +# Multimedia drivers +# +# CONFIG_DAB is not set + +# +# Graphics support +# +# CONFIG_VGASTATE is not set +# CONFIG_VIDEO_OUTPUT_CONTROL is not set +# CONFIG_FB is not set +# CONFIG_BACKLIGHT_LCD_SUPPORT is not set + +# +# Display device support +# +# CONFIG_DISPLAY_SUPPORT is not set + +# +# Sound +# +# CONFIG_SOUND is not set +# CONFIG_USB_SUPPORT is not set +# CONFIG_MMC is not set +# CONFIG_MEMSTICK is not set +# CONFIG_NEW_LEDS is not set +# CONFIG_ACCESSIBILITY is not set +# CONFIG_RTC_CLASS is not set +# CONFIG_UIO is not set + +# +# File systems +# +CONFIG_EXT2_FS=y +# CONFIG_EXT2_FS_XATTR is not set +# CONFIG_EXT3_FS is not set +# CONFIG_EXT4DEV_FS is not set +# CONFIG_REISERFS_FS is not set +# CONFIG_JFS_FS is not set +# CONFIG_FS_POSIX_ACL is not set +# CONFIG_XFS_FS is not set +# CONFIG_DNOTIFY is not set +# CONFIG_INOTIFY is not set +# CONFIG_QUOTA is not set +# CONFIG_AUTOFS_FS is not set +# CONFIG_AUTOFS4_FS is not set +# CONFIG_FUSE_FS is not set + +# +# CD-ROM/DVD Filesystems +# +# CONFIG_ISO9660_FS is not set +# CONFIG_UDF_FS is not set + +# +# DOS/FAT/NT Filesystems +# +# CONFIG_MSDOS_FS is not set +# CONFIG_VFAT_FS is not set +# CONFIG_NTFS_FS is not set + +# +# Pseudo filesystems +# +CONFIG_PROC_FS=y +CONFIG_PROC_SYSCTL=y +CONFIG_SYSFS=y +# CONFIG_TMPFS is not set +# CONFIG_HUGETLB_PAGE is not set +# CONFIG_CONFIGFS_FS is not set + +# +# Miscellaneous filesystems +# +# CONFIG_ADFS_FS is not set +# CONFIG_AFFS_FS is not set +# CONFIG_HFS_FS is not set +# CONFIG_HFSPLUS_FS is not set +# CONFIG_BEFS_FS is not set +# CONFIG_BFS_FS is not set +# CONFIG_EFS_FS is not set +# CONFIG_JFFS2_FS is not set +# CONFIG_CRAMFS is not set +# CONFIG_VXFS_FS is not set +# CONFIG_MINIX_FS is not set +# CONFIG_HPFS_FS is not set +# CONFIG_QNX4FS_FS is not set +CONFIG_ROMFS_FS=y +# CONFIG_SYSV_FS is not set +# CONFIG_UFS_FS is not set + +# +# Partition Types +# +# CONFIG_PARTITION_ADVANCED is not set +CONFIG_MSDOS_PARTITION=y +# CONFIG_NLS is not set + +# +# Kernel hacking +# +# CONFIG_PRINTK_TIME is not set +CONFIG_ENABLE_WARN_DEPRECATED=y +CONFIG_ENABLE_MUST_CHECK=y +CONFIG_FRAME_WARN=1024 +# CONFIG_MAGIC_SYSRQ is not set +# CONFIG_UNUSED_SYMBOLS is not set +# CONFIG_DEBUG_FS is not set +# CONFIG_HEADERS_CHECK is not set +# CONFIG_DEBUG_KERNEL is not set +# CONFIG_DEBUG_BUGVERBOSE is not set +# CONFIG_SAMPLES is not set +# CONFIG_FULLDEBUG is not set +# CONFIG_HIGHPROFILE is not set +# CONFIG_BOOTPARAM is not set +# CONFIG_NO_KERNEL_MSG is not set +# CONFIG_BDM_DISABLE is not set + +# +# Security options +# +# CONFIG_KEYS is not set +# CONFIG_SECURITY is not set +# CONFIG_SECURITY_FILE_CAPABILITIES is not set +# CONFIG_CRYPTO is not set + +# +# Library routines +# +# CONFIG_GENERIC_FIND_FIRST_BIT is not set +# CONFIG_CRC_CCITT is not set +# CONFIG_CRC16 is not set +# CONFIG_CRC_ITU_T is not set +# CONFIG_CRC32 is not set +# CONFIG_CRC7 is not set +# CONFIG_LIBCRC32C is not set +CONFIG_HAS_IOMEM=y +CONFIG_HAS_DMA=y diff --git a/arch/m68knommu/configs/m5275evb_defconfig b/arch/m68knommu/configs/m5275evb_defconfig new file mode 100644 index 0000000..0d1256f --- /dev/null +++ b/arch/m68knommu/configs/m5275evb_defconfig @@ -0,0 +1,627 @@ +# +# Automatically generated make config: don't edit +# Linux kernel version: 2.6.26-rc1 +# +CONFIG_M68K=y +# CONFIG_MMU is not set +# CONFIG_FPU is not set +CONFIG_ZONE_DMA=y +CONFIG_RWSEM_GENERIC_SPINLOCK=y +# CONFIG_RWSEM_XCHGADD_ALGORITHM is not set +# CONFIG_ARCH_HAS_ILOG2_U32 is not set +# CONFIG_ARCH_HAS_ILOG2_U64 is not set +CONFIG_GENERIC_FIND_NEXT_BIT=y +CONFIG_GENERIC_HWEIGHT=y +CONFIG_GENERIC_HARDIRQS=y +CONFIG_GENERIC_CALIBRATE_DELAY=y +CONFIG_GENERIC_TIME=y +CONFIG_TIME_LOW_RES=y +CONFIG_NO_IOPORT=y +CONFIG_ARCH_SUPPORTS_AOUT=y +CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config" + +# +# General setup +# +CONFIG_EXPERIMENTAL=y +CONFIG_BROKEN_ON_SMP=y +CONFIG_INIT_ENV_ARG_LIMIT=32 +CONFIG_LOCALVERSION="" +CONFIG_LOCALVERSION_AUTO=y +# CONFIG_SYSVIPC is not set +# CONFIG_POSIX_MQUEUE is not set +# CONFIG_BSD_PROCESS_ACCT is not set +# CONFIG_TASKSTATS is not set +# CONFIG_AUDIT is not set +# CONFIG_IKCONFIG is not set +CONFIG_LOG_BUF_SHIFT=14 +# CONFIG_CGROUPS is not set +# CONFIG_GROUP_SCHED is not set +# CONFIG_SYSFS_DEPRECATED_V2 is not set +# CONFIG_RELAY is not set +# CONFIG_NAMESPACES is not set +# CONFIG_BLK_DEV_INITRD is not set +# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set +CONFIG_SYSCTL=y +CONFIG_EMBEDDED=y +# CONFIG_UID16 is not set +# CONFIG_SYSCTL_SYSCALL is not set +# CONFIG_KALLSYMS is not set +# CONFIG_HOTPLUG is not set +CONFIG_PRINTK=y +CONFIG_BUG=y +CONFIG_ELF_CORE=y +# CONFIG_COMPAT_BRK is not set +CONFIG_BASE_FULL=y +# CONFIG_FUTEX is not set +# CONFIG_EPOLL is not set +# CONFIG_SIGNALFD is not set +# CONFIG_TIMERFD is not set +# CONFIG_EVENTFD is not set +# CONFIG_VM_EVENT_COUNTERS is not set +CONFIG_SLAB=y +# CONFIG_SLUB is not set +# CONFIG_SLOB is not set +# CONFIG_PROFILING is not set +# CONFIG_MARKERS is not set +# CONFIG_HAVE_OPROFILE is not set +# CONFIG_HAVE_KPROBES is not set +# CONFIG_HAVE_KRETPROBES is not set +# CONFIG_HAVE_DMA_ATTRS is not set +CONFIG_SLABINFO=y +CONFIG_TINY_SHMEM=y +CONFIG_BASE_SMALL=0 +CONFIG_MODULES=y +CONFIG_MODULE_UNLOAD=y +# CONFIG_MODULE_FORCE_UNLOAD is not set +# CONFIG_MODVERSIONS is not set +# CONFIG_MODULE_SRCVERSION_ALL is not set +# CONFIG_KMOD is not set +CONFIG_BLOCK=y +# CONFIG_LBD is not set +# CONFIG_BLK_DEV_IO_TRACE is not set +# CONFIG_LSF is not set +# CONFIG_BLK_DEV_BSG is not set + +# +# IO Schedulers +# +CONFIG_IOSCHED_NOOP=y +# CONFIG_IOSCHED_AS is not set +# CONFIG_IOSCHED_DEADLINE is not set +# CONFIG_IOSCHED_CFQ is not set +# CONFIG_DEFAULT_AS is not set +# CONFIG_DEFAULT_DEADLINE is not set +# CONFIG_DEFAULT_CFQ is not set +CONFIG_DEFAULT_NOOP=y +CONFIG_DEFAULT_IOSCHED="noop" +CONFIG_CLASSIC_RCU=y + +# +# Processor type and features +# +# CONFIG_M68328 is not set +# CONFIG_M68EZ328 is not set +# CONFIG_M68VZ328 is not set +# CONFIG_M68360 is not set +# CONFIG_M5206 is not set +# CONFIG_M5206e is not set +# CONFIG_M520x is not set +# CONFIG_M523x is not set +# CONFIG_M5249 is not set +# CONFIG_M5271 is not set +# CONFIG_M5272 is not set +CONFIG_M5275=y +# CONFIG_M528x is not set +# CONFIG_M5307 is not set +# CONFIG_M532x is not set +# CONFIG_M5407 is not set +CONFIG_M527x=y +CONFIG_COLDFIRE=y +CONFIG_CLOCK_SET=y +CONFIG_CLOCK_FREQ=150000000 +CONFIG_CLOCK_DIV=2 + +# +# Platform +# +CONFIG_M5275EVB=y +CONFIG_FREESCALE=y +# CONFIG_4KSTACKS is not set +CONFIG_HZ=100 + +# +# RAM configuration +# +CONFIG_RAMBASE=0x00000000 +CONFIG_RAMSIZE=0x00000000 +CONFIG_VECTORBASE=0x00000000 +CONFIG_KERNELBASE=0x00020000 +CONFIG_RAMAUTOBIT=y +# CONFIG_RAM8BIT is not set +# CONFIG_RAM16BIT is not set +# CONFIG_RAM32BIT is not set + +# +# ROM configuration +# +# CONFIG_ROM is not set +CONFIG_RAMKERNEL=y +# CONFIG_ROMKERNEL is not set +CONFIG_SELECT_MEMORY_MODEL=y +CONFIG_FLATMEM_MANUAL=y +# CONFIG_DISCONTIGMEM_MANUAL is not set +# CONFIG_SPARSEMEM_MANUAL is not set +CONFIG_FLATMEM=y +CONFIG_FLAT_NODE_MEM_MAP=y +# CONFIG_SPARSEMEM_STATIC is not set +# CONFIG_SPARSEMEM_VMEMMAP_ENABLE is not set +CONFIG_PAGEFLAGS_EXTENDED=y +CONFIG_SPLIT_PTLOCK_CPUS=4 +# CONFIG_RESOURCES_64BIT is not set +CONFIG_ZONE_DMA_FLAG=1 +CONFIG_VIRT_TO_BUS=y +CONFIG_ISA_DMA_API=y + +# +# Bus options (PCI, PCMCIA, EISA, MCA, ISA) +# +# CONFIG_PCI is not set +# CONFIG_ARCH_SUPPORTS_MSI is not set + +# +# Executable file formats +# +CONFIG_BINFMT_FLAT=y +# CONFIG_BINFMT_ZFLAT is not set +# CONFIG_BINFMT_SHARED_FLAT is not set +# CONFIG_BINFMT_AOUT is not set +# CONFIG_BINFMT_MISC is not set + +# +# Power management options +# +# CONFIG_PM is not set + +# +# Networking +# +CONFIG_NET=y + +# +# Networking options +# +CONFIG_PACKET=y +# CONFIG_PACKET_MMAP is not set +CONFIG_UNIX=y +# CONFIG_NET_KEY is not set +CONFIG_INET=y +# CONFIG_IP_MULTICAST is not set +# CONFIG_IP_ADVANCED_ROUTER is not set +CONFIG_IP_FIB_HASH=y +# CONFIG_IP_PNP is not set +# CONFIG_NET_IPIP is not set +# CONFIG_NET_IPGRE is not set +# CONFIG_ARPD is not set +# CONFIG_SYN_COOKIES is not set +# CONFIG_INET_AH is not set +# CONFIG_INET_ESP is not set +# CONFIG_INET_IPCOMP is not set +# CONFIG_INET_XFRM_TUNNEL is not set +# CONFIG_INET_TUNNEL is not set +# CONFIG_INET_XFRM_MODE_TRANSPORT is not set +# CONFIG_INET_XFRM_MODE_TUNNEL is not set +# CONFIG_INET_XFRM_MODE_BEET is not set +# CONFIG_INET_LRO is not set +# CONFIG_INET_DIAG is not set +# CONFIG_TCP_CONG_ADVANCED is not set +CONFIG_TCP_CONG_CUBIC=y +CONFIG_DEFAULT_TCP_CONG="cubic" +# CONFIG_TCP_MD5SIG is not set +# CONFIG_IPV6 is not set +# CONFIG_NETWORK_SECMARK is not set +# CONFIG_NETFILTER is not set +# CONFIG_IP_DCCP is not set +# CONFIG_IP_SCTP is not set +# CONFIG_TIPC is not set +# CONFIG_ATM is not set +# CONFIG_BRIDGE is not set +# CONFIG_VLAN_8021Q is not set +# CONFIG_DECNET is not set +# CONFIG_LLC2 is not set +# CONFIG_IPX is not set +# CONFIG_ATALK is not set +# CONFIG_X25 is not set +# CONFIG_LAPB is not set +# CONFIG_ECONET is not set +# CONFIG_WAN_ROUTER is not set +# CONFIG_NET_SCHED is not set + +# +# Network testing +# +# CONFIG_NET_PKTGEN is not set +# CONFIG_HAMRADIO is not set +# CONFIG_CAN is not set +# CONFIG_IRDA is not set +# CONFIG_BT is not set +# CONFIG_AF_RXRPC is not set + +# +# Wireless +# +# CONFIG_CFG80211 is not set +# CONFIG_WIRELESS_EXT is not set +# CONFIG_MAC80211 is not set +# CONFIG_IEEE80211 is not set +# CONFIG_RFKILL is not set +# CONFIG_NET_9P is not set + +# +# Device Drivers +# + +# +# Generic Driver Options +# +CONFIG_STANDALONE=y +CONFIG_PREVENT_FIRMWARE_BUILD=y +# CONFIG_SYS_HYPERVISOR is not set +# CONFIG_CONNECTOR is not set +CONFIG_MTD=y +# CONFIG_MTD_DEBUG is not set +# CONFIG_MTD_CONCAT is not set +CONFIG_MTD_PARTITIONS=y +# CONFIG_MTD_REDBOOT_PARTS is not set +# CONFIG_MTD_CMDLINE_PARTS is not set +# CONFIG_MTD_AR7_PARTS is not set + +# +# User Modules And Translation Layers +# +CONFIG_MTD_CHAR=y +CONFIG_MTD_BLKDEVS=y +CONFIG_MTD_BLOCK=y +# CONFIG_FTL is not set +# CONFIG_NFTL is not set +# CONFIG_INFTL is not set +# CONFIG_RFD_FTL is not set +# CONFIG_SSFDC is not set +# CONFIG_MTD_OOPS is not set + +# +# RAM/ROM/Flash chip drivers +# +# CONFIG_MTD_CFI is not set +# CONFIG_MTD_JEDECPROBE is not set +CONFIG_MTD_MAP_BANK_WIDTH_1=y +CONFIG_MTD_MAP_BANK_WIDTH_2=y +CONFIG_MTD_MAP_BANK_WIDTH_4=y +# CONFIG_MTD_MAP_BANK_WIDTH_8 is not set +# CONFIG_MTD_MAP_BANK_WIDTH_16 is not set +# CONFIG_MTD_MAP_BANK_WIDTH_32 is not set +CONFIG_MTD_CFI_I1=y +CONFIG_MTD_CFI_I2=y +# CONFIG_MTD_CFI_I4 is not set +# CONFIG_MTD_CFI_I8 is not set +CONFIG_MTD_RAM=y +# CONFIG_MTD_ROM is not set +# CONFIG_MTD_ABSENT is not set + +# +# Mapping drivers for chip access +# +# CONFIG_MTD_COMPLEX_MAPPINGS is not set +CONFIG_MTD_UCLINUX=y +# CONFIG_MTD_PLATRAM is not set + +# +# Self-contained MTD device drivers +# +# CONFIG_MTD_SLRAM is not set +# CONFIG_MTD_PHRAM is not set +# CONFIG_MTD_MTDRAM is not set +# CONFIG_MTD_BLOCK2MTD is not set + +# +# Disk-On-Chip Device Drivers +# +# CONFIG_MTD_DOC2000 is not set +# CONFIG_MTD_DOC2001 is not set +# CONFIG_MTD_DOC2001PLUS is not set +# CONFIG_MTD_NAND is not set +# CONFIG_MTD_ONENAND is not set + +# +# UBI - Unsorted block images +# +# CONFIG_MTD_UBI is not set +# CONFIG_PARPORT is not set +CONFIG_BLK_DEV=y +# CONFIG_BLK_DEV_COW_COMMON is not set +# CONFIG_BLK_DEV_LOOP is not set +# CONFIG_BLK_DEV_NBD is not set +CONFIG_BLK_DEV_RAM=y +CONFIG_BLK_DEV_RAM_COUNT=16 +CONFIG_BLK_DEV_RAM_SIZE=4096 +# CONFIG_BLK_DEV_XIP is not set +# CONFIG_CDROM_PKTCDVD is not set +# CONFIG_ATA_OVER_ETH is not set +# CONFIG_MISC_DEVICES is not set +CONFIG_HAVE_IDE=y +# CONFIG_IDE is not set + +# +# SCSI device support +# +# CONFIG_RAID_ATTRS is not set +# CONFIG_SCSI is not set +# CONFIG_SCSI_DMA is not set +# CONFIG_SCSI_NETLINK is not set +# CONFIG_MD is not set +CONFIG_NETDEVICES=y +# CONFIG_NETDEVICES_MULTIQUEUE is not set +# CONFIG_DUMMY is not set +# CONFIG_BONDING is not set +# CONFIG_MACVLAN is not set +# CONFIG_EQUALIZER is not set +# CONFIG_TUN is not set +# CONFIG_VETH is not set +# CONFIG_PHYLIB is not set +CONFIG_NET_ETHERNET=y +# CONFIG_MII is not set +# CONFIG_IBM_NEW_EMAC_ZMII is not set +# CONFIG_IBM_NEW_EMAC_RGMII is not set +# CONFIG_IBM_NEW_EMAC_TAH is not set +# CONFIG_IBM_NEW_EMAC_EMAC4 is not set +# CONFIG_B44 is not set +CONFIG_FEC=y +CONFIG_FEC2=y +# CONFIG_NETDEV_1000 is not set +# CONFIG_NETDEV_10000 is not set + +# +# Wireless LAN +# +# CONFIG_WLAN_PRE80211 is not set +# CONFIG_WLAN_80211 is not set +# CONFIG_IWLWIFI is not set +# CONFIG_IWLWIFI_LEDS is not set +# CONFIG_WAN is not set +CONFIG_PPP=y +# CONFIG_PPP_MULTILINK is not set +# CONFIG_PPP_FILTER is not set +# CONFIG_PPP_ASYNC is not set +# CONFIG_PPP_SYNC_TTY is not set +# CONFIG_PPP_DEFLATE is not set +# CONFIG_PPP_BSDCOMP is not set +# CONFIG_PPP_MPPE is not set +# CONFIG_PPPOE is not set +# CONFIG_PPPOL2TP is not set +# CONFIG_SLIP is not set +CONFIG_SLHC=y +# CONFIG_NETCONSOLE is not set +# CONFIG_NETPOLL is not set +# CONFIG_NET_POLL_CONTROLLER is not set +# CONFIG_ISDN is not set +# CONFIG_PHONE is not set + +# +# Input device support +# +# CONFIG_INPUT is not set + +# +# Hardware I/O ports +# +# CONFIG_SERIO is not set +# CONFIG_GAMEPORT is not set + +# +# Character devices +# +# CONFIG_VT is not set +# CONFIG_DEVKMEM is not set +# CONFIG_SERIAL_NONSTANDARD is not set + +# +# Serial drivers +# +# CONFIG_SERIAL_8250 is not set + +# +# Non-8250 serial port support +# +CONFIG_SERIAL_CORE=y +CONFIG_SERIAL_CORE_CONSOLE=y +# CONFIG_SERIAL_COLDFIRE is not set +CONFIG_SERIAL_MCF=y +CONFIG_SERIAL_MCF_BAUDRATE=19200 +CONFIG_SERIAL_MCF_CONSOLE=y +# CONFIG_UNIX98_PTYS is not set +CONFIG_LEGACY_PTYS=y +CONFIG_LEGACY_PTY_COUNT=256 +# CONFIG_IPMI_HANDLER is not set +# CONFIG_HW_RANDOM is not set +# CONFIG_GEN_RTC is not set +# CONFIG_R3964 is not set +# CONFIG_RAW_DRIVER is not set +# CONFIG_TCG_TPM is not set +# CONFIG_I2C is not set +# CONFIG_SPI is not set +# CONFIG_W1 is not set +# CONFIG_POWER_SUPPLY is not set +# CONFIG_HWMON is not set +# CONFIG_THERMAL is not set +# CONFIG_WATCHDOG is not set + +# +# Sonics Silicon Backplane +# +CONFIG_SSB_POSSIBLE=y +# CONFIG_SSB is not set + +# +# Multifunction device drivers +# +# CONFIG_MFD_SM501 is not set +# CONFIG_HTC_PASIC3 is not set + +# +# Multimedia devices +# + +# +# Multimedia core support +# +# CONFIG_VIDEO_DEV is not set +# CONFIG_DVB_CORE is not set + +# +# Multimedia drivers +# +CONFIG_DAB=y + +# +# Graphics support +# +# CONFIG_VGASTATE is not set +# CONFIG_VIDEO_OUTPUT_CONTROL is not set +# CONFIG_FB is not set +# CONFIG_BACKLIGHT_LCD_SUPPORT is not set + +# +# Display device support +# +# CONFIG_DISPLAY_SUPPORT is not set + +# +# Sound +# +# CONFIG_SOUND is not set +# CONFIG_USB_SUPPORT is not set +# CONFIG_MMC is not set +# CONFIG_MEMSTICK is not set +# CONFIG_NEW_LEDS is not set +# CONFIG_ACCESSIBILITY is not set +# CONFIG_RTC_CLASS is not set +# CONFIG_UIO is not set + +# +# File systems +# +CONFIG_EXT2_FS=y +# CONFIG_EXT2_FS_XATTR is not set +# CONFIG_EXT3_FS is not set +# CONFIG_EXT4DEV_FS is not set +# CONFIG_REISERFS_FS is not set +# CONFIG_JFS_FS is not set +# CONFIG_FS_POSIX_ACL is not set +# CONFIG_XFS_FS is not set +# CONFIG_OCFS2_FS is not set +# CONFIG_DNOTIFY is not set +# CONFIG_INOTIFY is not set +# CONFIG_QUOTA is not set +# CONFIG_AUTOFS_FS is not set +# CONFIG_AUTOFS4_FS is not set +# CONFIG_FUSE_FS is not set + +# +# CD-ROM/DVD Filesystems +# +# CONFIG_ISO9660_FS is not set +# CONFIG_UDF_FS is not set + +# +# DOS/FAT/NT Filesystems +# +# CONFIG_MSDOS_FS is not set +# CONFIG_VFAT_FS is not set +# CONFIG_NTFS_FS is not set + +# +# Pseudo filesystems +# +CONFIG_PROC_FS=y +CONFIG_PROC_SYSCTL=y +CONFIG_SYSFS=y +# CONFIG_TMPFS is not set +# CONFIG_HUGETLB_PAGE is not set +# CONFIG_CONFIGFS_FS is not set + +# +# Miscellaneous filesystems +# +# CONFIG_ADFS_FS is not set +# CONFIG_AFFS_FS is not set +# CONFIG_HFS_FS is not set +# CONFIG_HFSPLUS_FS is not set +# CONFIG_BEFS_FS is not set +# CONFIG_BFS_FS is not set +# CONFIG_EFS_FS is not set +# CONFIG_JFFS2_FS is not set +# CONFIG_CRAMFS is not set +# CONFIG_VXFS_FS is not set +# CONFIG_MINIX_FS is not set +# CONFIG_HPFS_FS is not set +# CONFIG_QNX4FS_FS is not set +CONFIG_ROMFS_FS=y +# CONFIG_SYSV_FS is not set +# CONFIG_UFS_FS is not set +CONFIG_NETWORK_FILESYSTEMS=y +# CONFIG_NFS_FS is not set +# CONFIG_NFSD is not set +# CONFIG_SMB_FS is not set +# CONFIG_CIFS is not set +# CONFIG_NCP_FS is not set +# CONFIG_CODA_FS is not set +# CONFIG_AFS_FS is not set + +# +# Partition Types +# +# CONFIG_PARTITION_ADVANCED is not set +CONFIG_MSDOS_PARTITION=y +# CONFIG_NLS is not set +# CONFIG_DLM is not set + +# +# Kernel hacking +# +# CONFIG_PRINTK_TIME is not set +CONFIG_ENABLE_WARN_DEPRECATED=y +CONFIG_ENABLE_MUST_CHECK=y +CONFIG_FRAME_WARN=1024 +# CONFIG_MAGIC_SYSRQ is not set +# CONFIG_UNUSED_SYMBOLS is not set +# CONFIG_DEBUG_FS is not set +# CONFIG_HEADERS_CHECK is not set +# CONFIG_DEBUG_KERNEL is not set +# CONFIG_DEBUG_BUGVERBOSE is not set +# CONFIG_SAMPLES is not set +# CONFIG_FULLDEBUG is not set +# CONFIG_HIGHPROFILE is not set +# CONFIG_BOOTPARAM is not set +# CONFIG_NO_KERNEL_MSG is not set +# CONFIG_BDM_DISABLE is not set + +# +# Security options +# +# CONFIG_KEYS is not set +# CONFIG_SECURITY is not set +# CONFIG_SECURITY_FILE_CAPABILITIES is not set +# CONFIG_CRYPTO is not set + +# +# Library routines +# +# CONFIG_GENERIC_FIND_FIRST_BIT is not set +# CONFIG_CRC_CCITT is not set +# CONFIG_CRC16 is not set +# CONFIG_CRC_ITU_T is not set +# CONFIG_CRC32 is not set +# CONFIG_CRC7 is not set +# CONFIG_LIBCRC32C is not set +CONFIG_HAS_IOMEM=y +CONFIG_HAS_DMA=y diff --git a/arch/m68knommu/configs/m5307c3_defconfig b/arch/m68knommu/configs/m5307c3_defconfig new file mode 100644 index 0000000..fe2acdf --- /dev/null +++ b/arch/m68knommu/configs/m5307c3_defconfig @@ -0,0 +1,580 @@ +# +# Automatically generated make config: don't edit +# Linux kernel version: 2.6.26-rc1 +# +CONFIG_M68K=y +# CONFIG_MMU is not set +# CONFIG_FPU is not set +CONFIG_ZONE_DMA=y +CONFIG_RWSEM_GENERIC_SPINLOCK=y +# CONFIG_RWSEM_XCHGADD_ALGORITHM is not set +# CONFIG_ARCH_HAS_ILOG2_U32 is not set +# CONFIG_ARCH_HAS_ILOG2_U64 is not set +CONFIG_GENERIC_FIND_NEXT_BIT=y +CONFIG_GENERIC_HWEIGHT=y +CONFIG_GENERIC_HARDIRQS=y +CONFIG_GENERIC_CALIBRATE_DELAY=y +CONFIG_GENERIC_TIME=y +CONFIG_TIME_LOW_RES=y +CONFIG_NO_IOPORT=y +CONFIG_ARCH_SUPPORTS_AOUT=y +CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config" + +# +# General setup +# +CONFIG_EXPERIMENTAL=y +CONFIG_BROKEN_ON_SMP=y +CONFIG_INIT_ENV_ARG_LIMIT=32 +CONFIG_LOCALVERSION="" +CONFIG_LOCALVERSION_AUTO=y +# CONFIG_SYSVIPC is not set +# CONFIG_POSIX_MQUEUE is not set +# CONFIG_BSD_PROCESS_ACCT is not set +# CONFIG_TASKSTATS is not set +# CONFIG_AUDIT is not set +# CONFIG_IKCONFIG is not set +CONFIG_LOG_BUF_SHIFT=14 +# CONFIG_CGROUPS is not set +# CONFIG_GROUP_SCHED is not set +# CONFIG_SYSFS_DEPRECATED_V2 is not set +# CONFIG_RELAY is not set +# CONFIG_NAMESPACES is not set +# CONFIG_BLK_DEV_INITRD is not set +# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set +CONFIG_SYSCTL=y +CONFIG_EMBEDDED=y +# CONFIG_UID16 is not set +# CONFIG_SYSCTL_SYSCALL is not set +# CONFIG_KALLSYMS is not set +# CONFIG_HOTPLUG is not set +CONFIG_PRINTK=y +CONFIG_BUG=y +CONFIG_ELF_CORE=y +# CONFIG_COMPAT_BRK is not set +CONFIG_BASE_FULL=y +# CONFIG_FUTEX is not set +# CONFIG_EPOLL is not set +# CONFIG_SIGNALFD is not set +# CONFIG_TIMERFD is not set +# CONFIG_EVENTFD is not set +# CONFIG_VM_EVENT_COUNTERS is not set +CONFIG_SLAB=y +# CONFIG_SLUB is not set +# CONFIG_SLOB is not set +# CONFIG_PROFILING is not set +# CONFIG_MARKERS is not set +# CONFIG_HAVE_OPROFILE is not set +# CONFIG_HAVE_KPROBES is not set +# CONFIG_HAVE_KRETPROBES is not set +# CONFIG_HAVE_DMA_ATTRS is not set +CONFIG_SLABINFO=y +CONFIG_TINY_SHMEM=y +CONFIG_BASE_SMALL=0 +CONFIG_MODULES=y +CONFIG_MODULE_UNLOAD=y +# CONFIG_MODULE_FORCE_UNLOAD is not set +# CONFIG_MODVERSIONS is not set +# CONFIG_MODULE_SRCVERSION_ALL is not set +# CONFIG_KMOD is not set +CONFIG_BLOCK=y +# CONFIG_LBD is not set +# CONFIG_BLK_DEV_IO_TRACE is not set +# CONFIG_LSF is not set +# CONFIG_BLK_DEV_BSG is not set + +# +# IO Schedulers +# +CONFIG_IOSCHED_NOOP=y +# CONFIG_IOSCHED_AS is not set +# CONFIG_IOSCHED_DEADLINE is not set +# CONFIG_IOSCHED_CFQ is not set +# CONFIG_DEFAULT_AS is not set +# CONFIG_DEFAULT_DEADLINE is not set +# CONFIG_DEFAULT_CFQ is not set +CONFIG_DEFAULT_NOOP=y +CONFIG_DEFAULT_IOSCHED="noop" +CONFIG_CLASSIC_RCU=y + +# +# Processor type and features +# +# CONFIG_M68328 is not set +# CONFIG_M68EZ328 is not set +# CONFIG_M68VZ328 is not set +# CONFIG_M68360 is not set +# CONFIG_M5206 is not set +# CONFIG_M5206e is not set +# CONFIG_M520x is not set +# CONFIG_M523x is not set +# CONFIG_M5249 is not set +# CONFIG_M5271 is not set +# CONFIG_M5272 is not set +# CONFIG_M5275 is not set +# CONFIG_M528x is not set +CONFIG_M5307=y +# CONFIG_M532x is not set +# CONFIG_M5407 is not set +CONFIG_COLDFIRE=y +CONFIG_CLOCK_SET=y +CONFIG_CLOCK_FREQ=90000000 +CONFIG_CLOCK_DIV=2 +# CONFIG_OLDMASK is not set + +# +# Platform +# +# CONFIG_ARN5307 is not set +CONFIG_M5307C3=y +# CONFIG_eLIA is not set +# CONFIG_SECUREEDGEMP3 is not set +# CONFIG_CLEOPATRA is not set +# CONFIG_NETtel is not set +CONFIG_FREESCALE=y +# CONFIG_4KSTACKS is not set +CONFIG_HZ=100 + +# +# RAM configuration +# +CONFIG_RAMBASE=0x00000000 +CONFIG_RAMSIZE=0x00800000 +CONFIG_VECTORBASE=0x00000000 +CONFIG_KERNELBASE=0x00020000 +CONFIG_RAMAUTOBIT=y +# CONFIG_RAM8BIT is not set +# CONFIG_RAM16BIT is not set +# CONFIG_RAM32BIT is not set + +# +# ROM configuration +# +# CONFIG_ROM is not set +CONFIG_RAMKERNEL=y +# CONFIG_ROMKERNEL is not set +CONFIG_SELECT_MEMORY_MODEL=y +CONFIG_FLATMEM_MANUAL=y +# CONFIG_DISCONTIGMEM_MANUAL is not set +# CONFIG_SPARSEMEM_MANUAL is not set +CONFIG_FLATMEM=y +CONFIG_FLAT_NODE_MEM_MAP=y +# CONFIG_SPARSEMEM_STATIC is not set +# CONFIG_SPARSEMEM_VMEMMAP_ENABLE is not set +CONFIG_PAGEFLAGS_EXTENDED=y +CONFIG_SPLIT_PTLOCK_CPUS=4 +# CONFIG_RESOURCES_64BIT is not set +CONFIG_ZONE_DMA_FLAG=1 +CONFIG_VIRT_TO_BUS=y +CONFIG_ISA_DMA_API=y + +# +# Bus options (PCI, PCMCIA, EISA, MCA, ISA) +# +# CONFIG_PCI is not set +# CONFIG_COMEMPCI is not set +# CONFIG_ARCH_SUPPORTS_MSI is not set + +# +# Executable file formats +# +CONFIG_BINFMT_FLAT=y +# CONFIG_BINFMT_ZFLAT is not set +# CONFIG_BINFMT_SHARED_FLAT is not set +# CONFIG_BINFMT_AOUT is not set +# CONFIG_BINFMT_MISC is not set + +# +# Power management options +# +# CONFIG_PM is not set + +# +# Networking +# +CONFIG_NET=y + +# +# Networking options +# +CONFIG_PACKET=y +# CONFIG_PACKET_MMAP is not set +CONFIG_UNIX=y +# CONFIG_NET_KEY is not set +CONFIG_INET=y +# CONFIG_IP_MULTICAST is not set +# CONFIG_IP_ADVANCED_ROUTER is not set +CONFIG_IP_FIB_HASH=y +# CONFIG_IP_PNP is not set +# CONFIG_NET_IPIP is not set +# CONFIG_NET_IPGRE is not set +# CONFIG_ARPD is not set +# CONFIG_SYN_COOKIES is not set +# CONFIG_INET_AH is not set +# CONFIG_INET_ESP is not set +# CONFIG_INET_IPCOMP is not set +# CONFIG_INET_XFRM_TUNNEL is not set +# CONFIG_INET_TUNNEL is not set +# CONFIG_INET_XFRM_MODE_TRANSPORT is not set +# CONFIG_INET_XFRM_MODE_TUNNEL is not set +# CONFIG_INET_XFRM_MODE_BEET is not set +# CONFIG_INET_LRO is not set +# CONFIG_INET_DIAG is not set +# CONFIG_TCP_CONG_ADVANCED is not set +CONFIG_TCP_CONG_CUBIC=y +CONFIG_DEFAULT_TCP_CONG="cubic" +# CONFIG_TCP_MD5SIG is not set +# CONFIG_IPV6 is not set +# CONFIG_NETWORK_SECMARK is not set +# CONFIG_NETFILTER is not set +# CONFIG_IP_DCCP is not set +# CONFIG_IP_SCTP is not set +# CONFIG_TIPC is not set +# CONFIG_ATM is not set +# CONFIG_BRIDGE is not set +# CONFIG_VLAN_8021Q is not set +# CONFIG_DECNET is not set +# CONFIG_LLC2 is not set +# CONFIG_IPX is not set +# CONFIG_ATALK is not set +# CONFIG_X25 is not set +# CONFIG_LAPB is not set +# CONFIG_ECONET is not set +# CONFIG_WAN_ROUTER is not set +# CONFIG_NET_SCHED is not set + +# +# Network testing +# +# CONFIG_NET_PKTGEN is not set +# CONFIG_HAMRADIO is not set +# CONFIG_CAN is not set +# CONFIG_IRDA is not set +# CONFIG_BT is not set +# CONFIG_AF_RXRPC is not set + +# +# Wireless +# +# CONFIG_CFG80211 is not set +# CONFIG_WIRELESS_EXT is not set +# CONFIG_MAC80211 is not set +# CONFIG_IEEE80211 is not set +# CONFIG_RFKILL is not set +# CONFIG_NET_9P is not set + +# +# Device Drivers +# + +# +# Generic Driver Options +# +CONFIG_STANDALONE=y +CONFIG_PREVENT_FIRMWARE_BUILD=y +# CONFIG_SYS_HYPERVISOR is not set +# CONFIG_CONNECTOR is not set +# CONFIG_MTD is not set +# CONFIG_PARPORT is not set +CONFIG_BLK_DEV=y +# CONFIG_BLK_DEV_COW_COMMON is not set +# CONFIG_BLK_DEV_LOOP is not set +# CONFIG_BLK_DEV_NBD is not set +CONFIG_BLK_DEV_RAM=y +CONFIG_BLK_DEV_RAM_COUNT=16 +CONFIG_BLK_DEV_RAM_SIZE=4096 +# CONFIG_BLK_DEV_XIP is not set +# CONFIG_CDROM_PKTCDVD is not set +# CONFIG_ATA_OVER_ETH is not set +# CONFIG_MISC_DEVICES is not set +CONFIG_HAVE_IDE=y +# CONFIG_IDE is not set + +# +# SCSI device support +# +# CONFIG_RAID_ATTRS is not set +# CONFIG_SCSI is not set +# CONFIG_SCSI_DMA is not set +# CONFIG_SCSI_NETLINK is not set +# CONFIG_MD is not set +CONFIG_NETDEVICES=y +# CONFIG_NETDEVICES_MULTIQUEUE is not set +# CONFIG_DUMMY is not set +# CONFIG_BONDING is not set +# CONFIG_MACVLAN is not set +# CONFIG_EQUALIZER is not set +# CONFIG_TUN is not set +# CONFIG_VETH is not set +# CONFIG_PHYLIB is not set +CONFIG_NET_ETHERNET=y +# CONFIG_MII is not set +# CONFIG_IBM_NEW_EMAC_ZMII is not set +# CONFIG_IBM_NEW_EMAC_RGMII is not set +# CONFIG_IBM_NEW_EMAC_TAH is not set +# CONFIG_IBM_NEW_EMAC_EMAC4 is not set +# CONFIG_B44 is not set +# CONFIG_NETDEV_1000 is not set +# CONFIG_NETDEV_10000 is not set + +# +# Wireless LAN +# +# CONFIG_WLAN_PRE80211 is not set +# CONFIG_WLAN_80211 is not set +# CONFIG_IWLWIFI is not set +# CONFIG_IWLWIFI_LEDS is not set +# CONFIG_WAN is not set +CONFIG_PPP=y +# CONFIG_PPP_MULTILINK is not set +# CONFIG_PPP_FILTER is not set +# CONFIG_PPP_ASYNC is not set +# CONFIG_PPP_SYNC_TTY is not set +# CONFIG_PPP_DEFLATE is not set +# CONFIG_PPP_BSDCOMP is not set +# CONFIG_PPP_MPPE is not set +# CONFIG_PPPOE is not set +# CONFIG_PPPOL2TP is not set +CONFIG_SLIP=y +CONFIG_SLIP_COMPRESSED=y +CONFIG_SLHC=y +# CONFIG_SLIP_SMART is not set +# CONFIG_SLIP_MODE_SLIP6 is not set +# CONFIG_NETCONSOLE is not set +# CONFIG_NETPOLL is not set +# CONFIG_NET_POLL_CONTROLLER is not set +# CONFIG_ISDN is not set +# CONFIG_PHONE is not set + +# +# Input device support +# +CONFIG_INPUT=y +# CONFIG_INPUT_FF_MEMLESS is not set +# CONFIG_INPUT_POLLDEV is not set + +# +# Userland interfaces +# +# CONFIG_INPUT_MOUSEDEV is not set +# CONFIG_INPUT_JOYDEV is not set +# CONFIG_INPUT_EVDEV is not set +# CONFIG_INPUT_EVBUG is not set + +# +# Input Device Drivers +# +# CONFIG_INPUT_KEYBOARD is not set +# CONFIG_INPUT_MOUSE is not set +# CONFIG_INPUT_JOYSTICK is not set +# CONFIG_INPUT_TABLET is not set +# CONFIG_INPUT_TOUCHSCREEN is not set +# CONFIG_INPUT_MISC is not set + +# +# Hardware I/O ports +# +# CONFIG_SERIO is not set +# CONFIG_GAMEPORT is not set + +# +# Character devices +# +# CONFIG_VT is not set +# CONFIG_DEVKMEM is not set +# CONFIG_SERIAL_NONSTANDARD is not set + +# +# Serial drivers +# +# CONFIG_SERIAL_8250 is not set + +# +# Non-8250 serial port support +# +CONFIG_SERIAL_CORE=y +CONFIG_SERIAL_CORE_CONSOLE=y +# CONFIG_SERIAL_COLDFIRE is not set +CONFIG_SERIAL_MCF=y +CONFIG_SERIAL_MCF_BAUDRATE=19200 +CONFIG_SERIAL_MCF_CONSOLE=y +CONFIG_UNIX98_PTYS=y +CONFIG_LEGACY_PTYS=y +CONFIG_LEGACY_PTY_COUNT=256 +# CONFIG_IPMI_HANDLER is not set +# CONFIG_HW_RANDOM is not set +# CONFIG_GEN_RTC is not set +# CONFIG_R3964 is not set +# CONFIG_RAW_DRIVER is not set +# CONFIG_TCG_TPM is not set +# CONFIG_I2C is not set +# CONFIG_SPI is not set +# CONFIG_W1 is not set +# CONFIG_POWER_SUPPLY is not set +# CONFIG_HWMON is not set +# CONFIG_THERMAL is not set +# CONFIG_WATCHDOG is not set + +# +# Sonics Silicon Backplane +# +CONFIG_SSB_POSSIBLE=y +# CONFIG_SSB is not set + +# +# Multifunction device drivers +# +# CONFIG_MFD_SM501 is not set +# CONFIG_HTC_PASIC3 is not set + +# +# Multimedia devices +# + +# +# Multimedia core support +# +# CONFIG_VIDEO_DEV is not set +# CONFIG_DVB_CORE is not set + +# +# Multimedia drivers +# +CONFIG_DAB=y + +# +# Graphics support +# +# CONFIG_VGASTATE is not set +# CONFIG_VIDEO_OUTPUT_CONTROL is not set +# CONFIG_FB is not set +# CONFIG_BACKLIGHT_LCD_SUPPORT is not set + +# +# Display device support +# +# CONFIG_DISPLAY_SUPPORT is not set + +# +# Sound +# +# CONFIG_SOUND is not set +# CONFIG_HID_SUPPORT is not set +# CONFIG_USB_SUPPORT is not set +# CONFIG_MMC is not set +# CONFIG_MEMSTICK is not set +# CONFIG_NEW_LEDS is not set +# CONFIG_ACCESSIBILITY is not set +# CONFIG_RTC_CLASS is not set +# CONFIG_UIO is not set + +# +# File systems +# +CONFIG_EXT2_FS=y +# CONFIG_EXT2_FS_XATTR is not set +# CONFIG_EXT3_FS is not set +# CONFIG_EXT4DEV_FS is not set +# CONFIG_REISERFS_FS is not set +# CONFIG_JFS_FS is not set +# CONFIG_FS_POSIX_ACL is not set +# CONFIG_XFS_FS is not set +# CONFIG_OCFS2_FS is not set +# CONFIG_DNOTIFY is not set +# CONFIG_INOTIFY is not set +# CONFIG_QUOTA is not set +# CONFIG_AUTOFS_FS is not set +# CONFIG_AUTOFS4_FS is not set +# CONFIG_FUSE_FS is not set + +# +# CD-ROM/DVD Filesystems +# +# CONFIG_ISO9660_FS is not set +# CONFIG_UDF_FS is not set + +# +# DOS/FAT/NT Filesystems +# +# CONFIG_MSDOS_FS is not set +# CONFIG_VFAT_FS is not set +# CONFIG_NTFS_FS is not set + +# +# Pseudo filesystems +# +CONFIG_PROC_FS=y +CONFIG_PROC_SYSCTL=y +CONFIG_SYSFS=y +# CONFIG_TMPFS is not set +# CONFIG_HUGETLB_PAGE is not set +# CONFIG_CONFIGFS_FS is not set + +# +# Miscellaneous filesystems +# +# CONFIG_ADFS_FS is not set +# CONFIG_AFFS_FS is not set +# CONFIG_HFS_FS is not set +# CONFIG_HFSPLUS_FS is not set +# CONFIG_BEFS_FS is not set +# CONFIG_BFS_FS is not set +# CONFIG_EFS_FS is not set +# CONFIG_CRAMFS is not set +# CONFIG_VXFS_FS is not set +# CONFIG_MINIX_FS is not set +# CONFIG_HPFS_FS is not set +# CONFIG_QNX4FS_FS is not set +CONFIG_ROMFS_FS=y +# CONFIG_SYSV_FS is not set +# CONFIG_UFS_FS is not set +# CONFIG_NETWORK_FILESYSTEMS is not set + +# +# Partition Types +# +# CONFIG_PARTITION_ADVANCED is not set +CONFIG_MSDOS_PARTITION=y +# CONFIG_NLS is not set +# CONFIG_DLM is not set + +# +# Kernel hacking +# +# CONFIG_PRINTK_TIME is not set +CONFIG_ENABLE_WARN_DEPRECATED=y +CONFIG_ENABLE_MUST_CHECK=y +CONFIG_FRAME_WARN=1024 +# CONFIG_MAGIC_SYSRQ is not set +# CONFIG_UNUSED_SYMBOLS is not set +# CONFIG_DEBUG_FS is not set +# CONFIG_HEADERS_CHECK is not set +# CONFIG_DEBUG_KERNEL is not set +# CONFIG_DEBUG_BUGVERBOSE is not set +# CONFIG_SAMPLES is not set +CONFIG_FULLDEBUG=y +# CONFIG_HIGHPROFILE is not set +# CONFIG_BOOTPARAM is not set +# CONFIG_NO_KERNEL_MSG is not set +# CONFIG_BDM_DISABLE is not set + +# +# Security options +# +# CONFIG_KEYS is not set +# CONFIG_SECURITY is not set +# CONFIG_SECURITY_FILE_CAPABILITIES is not set +# CONFIG_CRYPTO is not set + +# +# Library routines +# +# CONFIG_GENERIC_FIND_FIRST_BIT is not set +# CONFIG_CRC_CCITT is not set +# CONFIG_CRC16 is not set +# CONFIG_CRC_ITU_T is not set +# CONFIG_CRC32 is not set +# CONFIG_CRC7 is not set +# CONFIG_LIBCRC32C is not set +CONFIG_HAS_IOMEM=y +CONFIG_HAS_DMA=y diff --git a/arch/m68knommu/configs/m5407c3_defconfig b/arch/m68knommu/configs/m5407c3_defconfig new file mode 100644 index 0000000..1118936 --- /dev/null +++ b/arch/m68knommu/configs/m5407c3_defconfig @@ -0,0 +1,641 @@ +# +# Automatically generated make config: don't edit +# Linux kernel version: 2.6.26-rc1 +# Wed May 7 10:25:16 2008 +# +CONFIG_M68K=y +# CONFIG_MMU is not set +# CONFIG_FPU is not set +CONFIG_ZONE_DMA=y +CONFIG_RWSEM_GENERIC_SPINLOCK=y +# CONFIG_RWSEM_XCHGADD_ALGORITHM is not set +# CONFIG_ARCH_HAS_ILOG2_U32 is not set +# CONFIG_ARCH_HAS_ILOG2_U64 is not set +CONFIG_GENERIC_FIND_NEXT_BIT=y +CONFIG_GENERIC_HWEIGHT=y +CONFIG_GENERIC_HARDIRQS=y +CONFIG_GENERIC_CALIBRATE_DELAY=y +CONFIG_GENERIC_TIME=y +CONFIG_TIME_LOW_RES=y +CONFIG_NO_IOPORT=y +CONFIG_ARCH_SUPPORTS_AOUT=y +CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config" + +# +# General setup +# +CONFIG_EXPERIMENTAL=y +CONFIG_BROKEN_ON_SMP=y +CONFIG_INIT_ENV_ARG_LIMIT=32 +CONFIG_LOCALVERSION="" +CONFIG_LOCALVERSION_AUTO=y +# CONFIG_SYSVIPC is not set +# CONFIG_POSIX_MQUEUE is not set +# CONFIG_BSD_PROCESS_ACCT is not set +# CONFIG_TASKSTATS is not set +# CONFIG_AUDIT is not set +# CONFIG_IKCONFIG is not set +CONFIG_LOG_BUF_SHIFT=14 +# CONFIG_CGROUPS is not set +# CONFIG_GROUP_SCHED is not set +# CONFIG_SYSFS_DEPRECATED_V2 is not set +# CONFIG_RELAY is not set +# CONFIG_NAMESPACES is not set +# CONFIG_BLK_DEV_INITRD is not set +# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set +CONFIG_SYSCTL=y +CONFIG_EMBEDDED=y +# CONFIG_UID16 is not set +# CONFIG_SYSCTL_SYSCALL is not set +# CONFIG_KALLSYMS is not set +# CONFIG_HOTPLUG is not set +CONFIG_PRINTK=y +CONFIG_BUG=y +CONFIG_ELF_CORE=y +# CONFIG_COMPAT_BRK is not set +CONFIG_BASE_FULL=y +# CONFIG_FUTEX is not set +# CONFIG_EPOLL is not set +# CONFIG_SIGNALFD is not set +# CONFIG_TIMERFD is not set +# CONFIG_EVENTFD is not set +# CONFIG_VM_EVENT_COUNTERS is not set +CONFIG_SLAB=y +# CONFIG_SLUB is not set +# CONFIG_SLOB is not set +# CONFIG_PROFILING is not set +# CONFIG_MARKERS is not set +# CONFIG_HAVE_OPROFILE is not set +# CONFIG_HAVE_KPROBES is not set +# CONFIG_HAVE_KRETPROBES is not set +# CONFIG_HAVE_DMA_ATTRS is not set +CONFIG_SLABINFO=y +CONFIG_TINY_SHMEM=y +CONFIG_BASE_SMALL=0 +CONFIG_MODULES=y +CONFIG_MODULE_UNLOAD=y +# CONFIG_MODULE_FORCE_UNLOAD is not set +# CONFIG_MODVERSIONS is not set +# CONFIG_MODULE_SRCVERSION_ALL is not set +# CONFIG_KMOD is not set +CONFIG_BLOCK=y +# CONFIG_LBD is not set +# CONFIG_BLK_DEV_IO_TRACE is not set +# CONFIG_LSF is not set +# CONFIG_BLK_DEV_BSG is not set + +# +# IO Schedulers +# +CONFIG_IOSCHED_NOOP=y +# CONFIG_IOSCHED_AS is not set +# CONFIG_IOSCHED_DEADLINE is not set +# CONFIG_IOSCHED_CFQ is not set +# CONFIG_DEFAULT_AS is not set +# CONFIG_DEFAULT_DEADLINE is not set +# CONFIG_DEFAULT_CFQ is not set +CONFIG_DEFAULT_NOOP=y +CONFIG_DEFAULT_IOSCHED="noop" +CONFIG_CLASSIC_RCU=y + +# +# Processor type and features +# +# CONFIG_M68328 is not set +# CONFIG_M68EZ328 is not set +# CONFIG_M68VZ328 is not set +# CONFIG_M68360 is not set +# CONFIG_M5206 is not set +# CONFIG_M5206e is not set +# CONFIG_M520x is not set +# CONFIG_M523x is not set +# CONFIG_M5249 is not set +# CONFIG_M5271 is not set +# CONFIG_M5272 is not set +# CONFIG_M5275 is not set +# CONFIG_M528x is not set +# CONFIG_M5307 is not set +# CONFIG_M532x is not set +CONFIG_M5407=y +CONFIG_COLDFIRE=y +CONFIG_CLOCK_SET=y +CONFIG_CLOCK_FREQ=50000000 +CONFIG_CLOCK_DIV=1 + +# +# Platform +# +CONFIG_M5407C3=y +# CONFIG_CLEOPATRA is not set +CONFIG_FREESCALE=y +CONFIG_4KSTACKS=y +CONFIG_HZ=100 + +# +# RAM configuration +# +CONFIG_RAMBASE=0x00000000 +CONFIG_RAMSIZE=0x00000000 +CONFIG_VECTORBASE=0x00000000 +CONFIG_KERNELBASE=0x00020000 +CONFIG_RAMAUTOBIT=y +# CONFIG_RAM8BIT is not set +# CONFIG_RAM16BIT is not set +# CONFIG_RAM32BIT is not set + +# +# ROM configuration +# +# CONFIG_ROM is not set +CONFIG_RAMKERNEL=y +# CONFIG_ROMKERNEL is not set +CONFIG_SELECT_MEMORY_MODEL=y +CONFIG_FLATMEM_MANUAL=y +# CONFIG_DISCONTIGMEM_MANUAL is not set +# CONFIG_SPARSEMEM_MANUAL is not set +CONFIG_FLATMEM=y +CONFIG_FLAT_NODE_MEM_MAP=y +# CONFIG_SPARSEMEM_STATIC is not set +# CONFIG_SPARSEMEM_VMEMMAP_ENABLE is not set +CONFIG_PAGEFLAGS_EXTENDED=y +CONFIG_SPLIT_PTLOCK_CPUS=4 +# CONFIG_RESOURCES_64BIT is not set +CONFIG_ZONE_DMA_FLAG=1 +CONFIG_VIRT_TO_BUS=y +CONFIG_ISA_DMA_API=y + +# +# Bus options (PCI, PCMCIA, EISA, MCA, ISA) +# +# CONFIG_PCI is not set +# CONFIG_COMEMPCI is not set +# CONFIG_ARCH_SUPPORTS_MSI is not set + +# +# Executable file formats +# +CONFIG_BINFMT_FLAT=y +# CONFIG_BINFMT_ZFLAT is not set +# CONFIG_BINFMT_SHARED_FLAT is not set +# CONFIG_BINFMT_AOUT is not set +# CONFIG_BINFMT_MISC is not set + +# +# Power management options +# +# CONFIG_PM is not set + +# +# Networking +# +CONFIG_NET=y + +# +# Networking options +# +CONFIG_PACKET=y +# CONFIG_PACKET_MMAP is not set +CONFIG_UNIX=y +# CONFIG_NET_KEY is not set +CONFIG_INET=y +# CONFIG_IP_MULTICAST is not set +# CONFIG_IP_ADVANCED_ROUTER is not set +CONFIG_IP_FIB_HASH=y +# CONFIG_IP_PNP is not set +# CONFIG_NET_IPIP is not set +# CONFIG_NET_IPGRE is not set +# CONFIG_ARPD is not set +# CONFIG_SYN_COOKIES is not set +# CONFIG_INET_AH is not set +# CONFIG_INET_ESP is not set +# CONFIG_INET_IPCOMP is not set +# CONFIG_INET_XFRM_TUNNEL is not set +# CONFIG_INET_TUNNEL is not set +# CONFIG_INET_XFRM_MODE_TRANSPORT is not set +# CONFIG_INET_XFRM_MODE_TUNNEL is not set +# CONFIG_INET_XFRM_MODE_BEET is not set +# CONFIG_INET_LRO is not set +# CONFIG_INET_DIAG is not set +# CONFIG_TCP_CONG_ADVANCED is not set +CONFIG_TCP_CONG_CUBIC=y +CONFIG_DEFAULT_TCP_CONG="cubic" +# CONFIG_TCP_MD5SIG is not set +# CONFIG_IPV6 is not set +# CONFIG_NETWORK_SECMARK is not set +# CONFIG_NETFILTER is not set +# CONFIG_IP_DCCP is not set +# CONFIG_IP_SCTP is not set +# CONFIG_TIPC is not set +# CONFIG_ATM is not set +# CONFIG_BRIDGE is not set +# CONFIG_VLAN_8021Q is not set +# CONFIG_DECNET is not set +# CONFIG_LLC2 is not set +# CONFIG_IPX is not set +# CONFIG_ATALK is not set +# CONFIG_X25 is not set +# CONFIG_LAPB is not set +# CONFIG_ECONET is not set +# CONFIG_WAN_ROUTER is not set +# CONFIG_NET_SCHED is not set + +# +# Network testing +# +# CONFIG_NET_PKTGEN is not set +# CONFIG_HAMRADIO is not set +# CONFIG_CAN is not set +# CONFIG_IRDA is not set +# CONFIG_BT is not set +# CONFIG_AF_RXRPC is not set + +# +# Wireless +# +# CONFIG_CFG80211 is not set +# CONFIG_WIRELESS_EXT is not set +# CONFIG_MAC80211 is not set +# CONFIG_IEEE80211 is not set +# CONFIG_RFKILL is not set +# CONFIG_NET_9P is not set + +# +# Device Drivers +# + +# +# Generic Driver Options +# +CONFIG_STANDALONE=y +CONFIG_PREVENT_FIRMWARE_BUILD=y +# CONFIG_SYS_HYPERVISOR is not set +# CONFIG_CONNECTOR is not set +CONFIG_MTD=y +# CONFIG_MTD_DEBUG is not set +# CONFIG_MTD_CONCAT is not set +CONFIG_MTD_PARTITIONS=y +# CONFIG_MTD_REDBOOT_PARTS is not set +# CONFIG_MTD_CMDLINE_PARTS is not set +# CONFIG_MTD_AR7_PARTS is not set + +# +# User Modules And Translation Layers +# +CONFIG_MTD_CHAR=y +CONFIG_MTD_BLKDEVS=y +CONFIG_MTD_BLOCK=y +# CONFIG_FTL is not set +# CONFIG_NFTL is not set +# CONFIG_INFTL is not set +# CONFIG_RFD_FTL is not set +# CONFIG_SSFDC is not set +# CONFIG_MTD_OOPS is not set + +# +# RAM/ROM/Flash chip drivers +# +# CONFIG_MTD_CFI is not set +# CONFIG_MTD_JEDECPROBE is not set +CONFIG_MTD_MAP_BANK_WIDTH_1=y +CONFIG_MTD_MAP_BANK_WIDTH_2=y +CONFIG_MTD_MAP_BANK_WIDTH_4=y +# CONFIG_MTD_MAP_BANK_WIDTH_8 is not set +# CONFIG_MTD_MAP_BANK_WIDTH_16 is not set +# CONFIG_MTD_MAP_BANK_WIDTH_32 is not set +CONFIG_MTD_CFI_I1=y +CONFIG_MTD_CFI_I2=y +# CONFIG_MTD_CFI_I4 is not set +# CONFIG_MTD_CFI_I8 is not set +CONFIG_MTD_RAM=y +# CONFIG_MTD_ROM is not set +# CONFIG_MTD_ABSENT is not set + +# +# Mapping drivers for chip access +# +# CONFIG_MTD_COMPLEX_MAPPINGS is not set +CONFIG_MTD_UCLINUX=y +# CONFIG_MTD_PLATRAM is not set + +# +# Self-contained MTD device drivers +# +# CONFIG_MTD_SLRAM is not set +# CONFIG_MTD_PHRAM is not set +# CONFIG_MTD_MTDRAM is not set +# CONFIG_MTD_BLOCK2MTD is not set + +# +# Disk-On-Chip Device Drivers +# +# CONFIG_MTD_DOC2000 is not set +# CONFIG_MTD_DOC2001 is not set +# CONFIG_MTD_DOC2001PLUS is not set +# CONFIG_MTD_NAND is not set +# CONFIG_MTD_ONENAND is not set + +# +# UBI - Unsorted block images +# +# CONFIG_MTD_UBI is not set +# CONFIG_PARPORT is not set +CONFIG_BLK_DEV=y +# CONFIG_BLK_DEV_COW_COMMON is not set +# CONFIG_BLK_DEV_LOOP is not set +# CONFIG_BLK_DEV_NBD is not set +CONFIG_BLK_DEV_RAM=y +CONFIG_BLK_DEV_RAM_COUNT=16 +CONFIG_BLK_DEV_RAM_SIZE=4096 +# CONFIG_BLK_DEV_XIP is not set +# CONFIG_CDROM_PKTCDVD is not set +# CONFIG_ATA_OVER_ETH is not set +# CONFIG_MISC_DEVICES is not set +CONFIG_HAVE_IDE=y +# CONFIG_IDE is not set + +# +# SCSI device support +# +# CONFIG_RAID_ATTRS is not set +# CONFIG_SCSI is not set +# CONFIG_SCSI_DMA is not set +# CONFIG_SCSI_NETLINK is not set +# CONFIG_MD is not set +CONFIG_NETDEVICES=y +# CONFIG_NETDEVICES_MULTIQUEUE is not set +# CONFIG_DUMMY is not set +# CONFIG_BONDING is not set +# CONFIG_MACVLAN is not set +# CONFIG_EQUALIZER is not set +# CONFIG_TUN is not set +# CONFIG_VETH is not set +# CONFIG_PHYLIB is not set +CONFIG_NET_ETHERNET=y +# CONFIG_MII is not set +# CONFIG_IBM_NEW_EMAC_ZMII is not set +# CONFIG_IBM_NEW_EMAC_RGMII is not set +# CONFIG_IBM_NEW_EMAC_TAH is not set +# CONFIG_IBM_NEW_EMAC_EMAC4 is not set +# CONFIG_B44 is not set +# CONFIG_NETDEV_1000 is not set +# CONFIG_NETDEV_10000 is not set + +# +# Wireless LAN +# +# CONFIG_WLAN_PRE80211 is not set +# CONFIG_WLAN_80211 is not set +# CONFIG_IWLWIFI is not set +# CONFIG_IWLWIFI_LEDS is not set +# CONFIG_WAN is not set +CONFIG_PPP=y +# CONFIG_PPP_MULTILINK is not set +# CONFIG_PPP_FILTER is not set +# CONFIG_PPP_ASYNC is not set +# CONFIG_PPP_SYNC_TTY is not set +# CONFIG_PPP_DEFLATE is not set +# CONFIG_PPP_BSDCOMP is not set +# CONFIG_PPP_MPPE is not set +# CONFIG_PPPOE is not set +# CONFIG_PPPOL2TP is not set +# CONFIG_SLIP is not set +CONFIG_SLHC=y +# CONFIG_NETCONSOLE is not set +# CONFIG_NETPOLL is not set +# CONFIG_NET_POLL_CONTROLLER is not set +# CONFIG_ISDN is not set +# CONFIG_PHONE is not set + +# +# Input device support +# +CONFIG_INPUT=y +# CONFIG_INPUT_FF_MEMLESS is not set +# CONFIG_INPUT_POLLDEV is not set + +# +# Userland interfaces +# +# CONFIG_INPUT_MOUSEDEV is not set +# CONFIG_INPUT_JOYDEV is not set +# CONFIG_INPUT_EVDEV is not set +# CONFIG_INPUT_EVBUG is not set + +# +# Input Device Drivers +# +# CONFIG_INPUT_KEYBOARD is not set +# CONFIG_INPUT_MOUSE is not set +# CONFIG_INPUT_JOYSTICK is not set +# CONFIG_INPUT_TABLET is not set +# CONFIG_INPUT_TOUCHSCREEN is not set +# CONFIG_INPUT_MISC is not set + +# +# Hardware I/O ports +# +# CONFIG_SERIO is not set +# CONFIG_GAMEPORT is not set + +# +# Character devices +# +# CONFIG_VT is not set +# CONFIG_DEVKMEM is not set +# CONFIG_SERIAL_NONSTANDARD is not set + +# +# Serial drivers +# +# CONFIG_SERIAL_8250 is not set + +# +# Non-8250 serial port support +# +CONFIG_SERIAL_CORE=y +CONFIG_SERIAL_CORE_CONSOLE=y +# CONFIG_SERIAL_COLDFIRE is not set +CONFIG_SERIAL_MCF=y +CONFIG_SERIAL_MCF_BAUDRATE=19200 +CONFIG_SERIAL_MCF_CONSOLE=y +# CONFIG_UNIX98_PTYS is not set +CONFIG_LEGACY_PTYS=y +CONFIG_LEGACY_PTY_COUNT=256 +# CONFIG_IPMI_HANDLER is not set +# CONFIG_HW_RANDOM is not set +# CONFIG_GEN_RTC is not set +# CONFIG_R3964 is not set +# CONFIG_RAW_DRIVER is not set +# CONFIG_TCG_TPM is not set +# CONFIG_I2C is not set +# CONFIG_SPI is not set +# CONFIG_W1 is not set +# CONFIG_POWER_SUPPLY is not set +# CONFIG_HWMON is not set +# CONFIG_THERMAL is not set +# CONFIG_WATCHDOG is not set + +# +# Sonics Silicon Backplane +# +CONFIG_SSB_POSSIBLE=y +# CONFIG_SSB is not set + +# +# Multifunction device drivers +# +# CONFIG_MFD_SM501 is not set +# CONFIG_HTC_PASIC3 is not set + +# +# Multimedia devices +# + +# +# Multimedia core support +# +# CONFIG_VIDEO_DEV is not set +# CONFIG_DVB_CORE is not set + +# +# Multimedia drivers +# +CONFIG_DAB=y + +# +# Graphics support +# +# CONFIG_VGASTATE is not set +# CONFIG_VIDEO_OUTPUT_CONTROL is not set +# CONFIG_FB is not set +# CONFIG_BACKLIGHT_LCD_SUPPORT is not set + +# +# Display device support +# +# CONFIG_DISPLAY_SUPPORT is not set + +# +# Sound +# +# CONFIG_SOUND is not set +# CONFIG_HID_SUPPORT is not set +# CONFIG_USB_SUPPORT is not set +# CONFIG_MMC is not set +# CONFIG_MEMSTICK is not set +# CONFIG_NEW_LEDS is not set +# CONFIG_ACCESSIBILITY is not set +# CONFIG_RTC_CLASS is not set +# CONFIG_UIO is not set + +# +# File systems +# +CONFIG_EXT2_FS=y +# CONFIG_EXT2_FS_XATTR is not set +# CONFIG_EXT3_FS is not set +# CONFIG_EXT4DEV_FS is not set +# CONFIG_REISERFS_FS is not set +# CONFIG_JFS_FS is not set +# CONFIG_FS_POSIX_ACL is not set +# CONFIG_XFS_FS is not set +# CONFIG_OCFS2_FS is not set +# CONFIG_DNOTIFY is not set +# CONFIG_INOTIFY is not set +# CONFIG_QUOTA is not set +# CONFIG_AUTOFS_FS is not set +# CONFIG_AUTOFS4_FS is not set +# CONFIG_FUSE_FS is not set + +# +# CD-ROM/DVD Filesystems +# +# CONFIG_ISO9660_FS is not set +# CONFIG_UDF_FS is not set + +# +# DOS/FAT/NT Filesystems +# +# CONFIG_MSDOS_FS is not set +# CONFIG_VFAT_FS is not set +# CONFIG_NTFS_FS is not set + +# +# Pseudo filesystems +# +CONFIG_PROC_FS=y +CONFIG_PROC_SYSCTL=y +CONFIG_SYSFS=y +# CONFIG_TMPFS is not set +# CONFIG_HUGETLB_PAGE is not set +# CONFIG_CONFIGFS_FS is not set + +# +# Miscellaneous filesystems +# +# CONFIG_ADFS_FS is not set +# CONFIG_AFFS_FS is not set +# CONFIG_HFS_FS is not set +# CONFIG_HFSPLUS_FS is not set +# CONFIG_BEFS_FS is not set +# CONFIG_BFS_FS is not set +# CONFIG_EFS_FS is not set +# CONFIG_JFFS2_FS is not set +# CONFIG_CRAMFS is not set +# CONFIG_VXFS_FS is not set +# CONFIG_MINIX_FS is not set +# CONFIG_HPFS_FS is not set +# CONFIG_QNX4FS_FS is not set +CONFIG_ROMFS_FS=y +# CONFIG_SYSV_FS is not set +# CONFIG_UFS_FS is not set +# CONFIG_NETWORK_FILESYSTEMS is not set + +# +# Partition Types +# +# CONFIG_PARTITION_ADVANCED is not set +CONFIG_MSDOS_PARTITION=y +# CONFIG_NLS is not set +# CONFIG_DLM is not set + +# +# Kernel hacking +# +# CONFIG_PRINTK_TIME is not set +CONFIG_ENABLE_WARN_DEPRECATED=y +CONFIG_ENABLE_MUST_CHECK=y +CONFIG_FRAME_WARN=1024 +# CONFIG_MAGIC_SYSRQ is not set +# CONFIG_UNUSED_SYMBOLS is not set +# CONFIG_DEBUG_FS is not set +# CONFIG_HEADERS_CHECK is not set +# CONFIG_DEBUG_KERNEL is not set +# CONFIG_DEBUG_BUGVERBOSE is not set +# CONFIG_SAMPLES is not set +# CONFIG_FULLDEBUG is not set +# CONFIG_HIGHPROFILE is not set +# CONFIG_BOOTPARAM is not set +# CONFIG_NO_KERNEL_MSG is not set +# CONFIG_BDM_DISABLE is not set + +# +# Security options +# +# CONFIG_KEYS is not set +# CONFIG_SECURITY is not set +# CONFIG_SECURITY_FILE_CAPABILITIES is not set +# CONFIG_CRYPTO is not set + +# +# Library routines +# +# CONFIG_GENERIC_FIND_FIRST_BIT is not set +# CONFIG_CRC_CCITT is not set +# CONFIG_CRC16 is not set +# CONFIG_CRC_ITU_T is not set +# CONFIG_CRC32 is not set +# CONFIG_CRC7 is not set +# CONFIG_LIBCRC32C is not set +CONFIG_HAS_IOMEM=y +CONFIG_HAS_DMA=y diff --git a/arch/m68knommu/kernel/irq.c b/arch/m68knommu/kernel/irq.c index bba1bb4..9177a02 100644 --- a/arch/m68knommu/kernel/irq.c +++ b/arch/m68knommu/kernel/irq.c @@ -23,7 +23,7 @@ asmlinkage void do_IRQ(int irq, struct pt_regs *regs) struct pt_regs *oldregs = set_irq_regs(regs); irq_enter(); - __do_IRQ(irq); + generic_handle_irq(irq); irq_exit(); set_irq_regs(oldregs); @@ -34,12 +34,16 @@ void ack_bad_irq(unsigned int irq) printk(KERN_ERR "IRQ: unexpected irq=%d\n", irq); } +#ifndef CONFIG_M523x static struct irq_chip m_irq_chip = { .name = "M68K-INTC", .enable = enable_vector, .disable = disable_vector, .ack = ack_vector, }; +#else +void coldfire_init_irq_chip(void); +#endif void __init init_IRQ(void) { @@ -47,12 +51,16 @@ void __init init_IRQ(void) init_vectors(); +#ifndef CONFIG_M523x for (irq = 0; (irq < NR_IRQS); irq++) { irq_desc[irq].status = IRQ_DISABLED; irq_desc[irq].action = NULL; irq_desc[irq].depth = 1; irq_desc[irq].chip = &m_irq_chip; } +#else + coldfire_init_irq_chip(); +#endif } int show_interrupts(struct seq_file *p, void *v) @@ -79,4 +87,3 @@ int show_interrupts(struct seq_file *p, void *v) return 0; } - diff --git a/arch/m68knommu/kernel/time.c b/arch/m68knommu/kernel/time.c index 0ccfb2a..d182b2f 100644 --- a/arch/m68knommu/kernel/time.c +++ b/arch/m68knommu/kernel/time.c @@ -33,14 +33,13 @@ static inline int set_rtc_mmss(unsigned long nowtime) return -1; } +#ifndef CONFIG_GENERIC_CLOCKEVENTS /* * timer_interrupt() needs to keep up the real-time clock, * as well as call the "do_timer()" routine every clocktick */ irqreturn_t arch_timer_interrupt(int irq, void *dummy) { - /* last time the cmos clock got updated */ - static long last_rtc_update=0; if (current->pid) profile_tick(CPU_PROFILING); @@ -49,21 +48,6 @@ irqreturn_t arch_timer_interrupt(int irq, void *dummy) do_timer(1); - /* - * If we have an externally synchronized Linux clock, then update - * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be - * called as close as possible to 500 ms before the new second starts. - */ - if (ntp_synced() && - xtime.tv_sec > last_rtc_update + 660 && - (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 && - (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) { - if (set_rtc_mmss(xtime.tv_sec) == 0) - last_rtc_update = xtime.tv_sec; - else - last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */ - } - write_sequnlock(&xtime_lock); #ifndef CONFIG_SMP @@ -71,8 +55,9 @@ irqreturn_t arch_timer_interrupt(int irq, void *dummy) #endif return(IRQ_HANDLED); } +#endif -void time_init(void) +static unsigned long read_rtc_mmss(void) { unsigned int year, mon, day, hour, min, sec; @@ -83,10 +68,21 @@ void time_init(void) if ((year += 1900) < 1970) year += 100; - xtime.tv_sec = mktime(year, mon, day, hour, min, sec); - xtime.tv_nsec = 0; - wall_to_monotonic.tv_sec = -xtime.tv_sec; - hw_timer_init(); + return mktime(year, mon, day, hour, min, sec);; +} + +unsigned long read_persistent_clock(void) +{ + return read_rtc_mmss(); } +int update_persistent_clock(struct timespec now) +{ + return set_rtc_mmss(now.tv_sec); +} + +void time_init(void) +{ + hw_timer_init(); +} diff --git a/arch/m68knommu/kernel/traps.c b/arch/m68knommu/kernel/traps.c index ec9aea6..46f8f9d 100644 --- a/arch/m68knommu/kernel/traps.c +++ b/arch/m68knommu/kernel/traps.c @@ -103,12 +103,28 @@ asmlinkage void buserr_c(struct frame *fp) force_sig(SIGSEGV, current); } +static void print_this_address(unsigned long addr, int i) +{ +#ifdef CONFIG_KALLSYMS + printk(KERN_EMERG " [%08lx] ", addr); + print_symbol(KERN_CONT "%s\n", addr); +#else + if (i % 5) + printk(KERN_CONT " [%08lx] ", addr); + else + printk(KERN_CONT "\n" KERN_EMERG " [%08lx] ", addr); + i++; +#endif +} + int kstack_depth_to_print = 48; static void __show_stack(struct task_struct *task, unsigned long *stack) { unsigned long *endstack, addr; +#ifdef CONFIG_FRAME_POINTER unsigned long *last_stack; +#endif int i; if (!stack) @@ -126,6 +142,7 @@ static void __show_stack(struct task_struct *task, unsigned long *stack) printk(" %08lx", *(stack + i)); } printk("\n"); + i = 0; #ifdef CONFIG_FRAME_POINTER printk(KERN_EMERG "Call Trace:\n"); @@ -134,15 +151,30 @@ static void __show_stack(struct task_struct *task, unsigned long *stack) while (stack <= endstack && stack > last_stack) { addr = *(stack + 1); - printk(KERN_EMERG " [%08lx] ", addr); - print_symbol(KERN_CONT "%s\n", addr); + print_this_address(addr, i); + i++; last_stack = stack; stack = (unsigned long *)*stack; } printk("\n"); #else - printk(KERN_EMERG "CONFIG_FRAME_POINTER disabled, no symbolic call trace\n"); + printk(KERN_EMERG "Call Trace with CONFIG_FRAME_POINTER disabled:\n"); + while (stack <= endstack) { + addr = *stack++; + /* + * If the address is either in the text segment of the kernel, + * or in a region which is occupied by a module then it *may* + * be the address of a calling routine; if so, print it so that + * someone tracing down the cause of the crash will be able to + * figure out the call path that was taken. + */ + if (__kernel_text_address(addr)) { + print_this_address(addr, i); + i++; + } + } + printk(KERN_CONT "\n"); #endif } diff --git a/arch/m68knommu/platform/coldfire/Makefile b/arch/m68knommu/platform/coldfire/Makefile index 40cf20b..4c49c68 100644 --- a/arch/m68knommu/platform/coldfire/Makefile +++ b/arch/m68knommu/platform/coldfire/Makefile @@ -18,7 +18,7 @@ obj-$(CONFIG_COLDFIRE) += dma.o entry.o vectors.o obj-$(CONFIG_M5206) += timers.o obj-$(CONFIG_M5206e) += timers.o obj-$(CONFIG_M520x) += pit.o -obj-$(CONFIG_M523x) += pit.o +obj-$(CONFIG_M523x) += pit.o dma_timer.o irq_chip.o obj-$(CONFIG_M5249) += timers.o obj-$(CONFIG_M527x) += pit.o obj-$(CONFIG_M5272) += timers.o diff --git a/arch/m68knommu/platform/coldfire/dma_timer.c b/arch/m68knommu/platform/coldfire/dma_timer.c new file mode 100644 index 0000000..772578b --- /dev/null +++ b/arch/m68knommu/platform/coldfire/dma_timer.c @@ -0,0 +1,84 @@ +/* + * dma_timer.c -- Freescale ColdFire DMA Timer. + * + * Copyright (C) 2007, Benedikt Spranger + * Copyright (C) 2008. Sebastian Siewior, Linutronix + * + */ + +#include +#include + +#include +#include +#include +#include + +#define DMA_TIMER_0 (0x00) +#define DMA_TIMER_1 (0x40) +#define DMA_TIMER_2 (0x80) +#define DMA_TIMER_3 (0xc0) + +#define DTMR0 (MCF_IPSBAR + DMA_TIMER_0 + 0x400) +#define DTXMR0 (MCF_IPSBAR + DMA_TIMER_0 + 0x402) +#define DTER0 (MCF_IPSBAR + DMA_TIMER_0 + 0x403) +#define DTRR0 (MCF_IPSBAR + DMA_TIMER_0 + 0x404) +#define DTCR0 (MCF_IPSBAR + DMA_TIMER_0 + 0x408) +#define DTCN0 (MCF_IPSBAR + DMA_TIMER_0 + 0x40c) + +#define DMA_FREQ ((MCF_CLK / 2) / 16) + +/* DTMR */ +#define DMA_DTMR_RESTART (1 << 3) +#define DMA_DTMR_CLK_DIV_1 (1 << 1) +#define DMA_DTMR_CLK_DIV_16 (2 << 1) +#define DMA_DTMR_ENABLE (1 << 0) + +static cycle_t cf_dt_get_cycles(void) +{ + return __raw_readl(DTCN0); +} + +static struct clocksource clocksource_cf_dt = { + .name = "coldfire_dma_timer", + .rating = 200, + .read = cf_dt_get_cycles, + .mask = CLOCKSOURCE_MASK(32), + .shift = 20, + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + +static int __init init_cf_dt_clocksource(void) +{ + /* + * We setup DMA timer 0 in free run mode. This incrementing counter is + * used as a highly precious clock source. With MCF_CLOCK = 150 MHz we + * get a ~213 ns resolution and the 32bit register will overflow almost + * every 15 minutes. + */ + __raw_writeb(0x00, DTXMR0); + __raw_writeb(0x00, DTER0); + __raw_writel(0x00000000, DTRR0); + __raw_writew(DMA_DTMR_CLK_DIV_16 | DMA_DTMR_ENABLE, DTMR0); + clocksource_cf_dt.mult = clocksource_hz2mult(DMA_FREQ, + clocksource_cf_dt.shift); + return clocksource_register(&clocksource_cf_dt); +} + +arch_initcall(init_cf_dt_clocksource); + +#define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */ +#define CYC2NS_SCALE ((1000000 << CYC2NS_SCALE_FACTOR) / (DMA_FREQ / 1000)) + +static unsigned long long cycles2ns(unsigned long cycl) +{ + return (unsigned long long) ((unsigned long long)cycl * + CYC2NS_SCALE) >> CYC2NS_SCALE_FACTOR; +} + +unsigned long long sched_clock(void) +{ + unsigned long cycl = __raw_readl(DTCN0); + + return cycles2ns(cycl); +} diff --git a/arch/m68knommu/platform/coldfire/entry.S b/arch/m68knommu/platform/coldfire/entry.S index 1e3c0dc..3b471c0 100644 --- a/arch/m68knommu/platform/coldfire/entry.S +++ b/arch/m68knommu/platform/coldfire/entry.S @@ -215,19 +215,8 @@ ENTRY(fasthandler) RESTORE_LOCAL ENTRY(ret_from_interrupt) - moveb %sp@(PT_SR),%d0 - andl #0x7,%d0 - jeq 1f - - RESTORE_ALL - -1: - /* check if we need to do software interrupts */ - movel irq_stat+CPUSTAT_SOFTIRQ_PENDING,%d0 - jeq ret_from_exception - - pea ret_from_exception - jmp do_softirq + /* the fasthandler is confusing me, haven't seen any user */ + jmp ret_from_exception /* * Beware - when entering resume, prev (the current task) is diff --git a/arch/m68knommu/platform/coldfire/irq_chip.c b/arch/m68knommu/platform/coldfire/irq_chip.c new file mode 100644 index 0000000..cdbc421 --- /dev/null +++ b/arch/m68knommu/platform/coldfire/irq_chip.c @@ -0,0 +1,110 @@ +/* + * IRQ-Chip implementation for Coldfire + * + * Author: Sebastian Siewior + */ + +#include +#include +#include +#include + +static inline void *coldfire_irqnum_to_mem(unsigned int irq) +{ + u32 imrp; + + imrp = MCF_IPSBAR; +#if defined(MCFINT_INTC1_VECBASE) + if (irq > MCFINT_INTC1_VECBASE) { + imrp += MCFICM_INTC1; + irq -= MCFINT_PER_INTC; + } else +#endif + imrp += MCFICM_INTC0; + + irq -= MCFINT_VECBASE; + + if (irq > 32) + imrp += MCFINTC_IMRH; + else + imrp += MCFINTC_IMRL; + + return (void *)imrp; +} + +static inline unsigned int coldfire_irqnum_to_bit(unsigned int irq) +{ + irq -= MCFINT_VECBASE; + + if (irq > 32) + irq -= 32; + + return irq; +} + +static void coldfire_mask(unsigned int irq) +{ + volatile unsigned long *imrp; + u32 mask; + u32 irq_bit; + + imrp = coldfire_irqnum_to_mem(irq); + irq_bit = coldfire_irqnum_to_bit(irq); + + mask = 1 << irq_bit; + *imrp |= mask; +} + +static void coldfire_unmask(unsigned int irq) +{ + volatile unsigned long *imrp; + u32 mask; + u32 irq_bit; + + imrp = coldfire_irqnum_to_mem(irq); + irq_bit = coldfire_irqnum_to_bit(irq); + + mask = 1 << irq_bit; + *imrp &= ~mask; +} + +static void coldfire_nop(unsigned int irq) +{ +} + +static struct irq_chip m_irq_chip = { + .name = "M68K-INTC", + .ack = coldfire_nop, + .mask = coldfire_mask, + .unmask = coldfire_unmask, +}; + +void __init coldfire_init_irq_chip(void) +{ + volatile u32 *imrp; + volatile u8 *icrp; + u32 irq; + u32 i; + + for (irq = 0; irq < NR_IRQS; irq++) + set_irq_chip_and_handler_name(irq, &m_irq_chip, + handle_level_irq, m_irq_chip.name); + + /* setup prios for interrupt sources (first field is reserved) */ + icrp = (u8 *)MCF_IPSBAR + MCFICM_INTC0 + MCFINTC_ICR0; + for (i = 1; i <= 63; i++) + icrp[i] = i; + + /* remove the disable all flag, disable all interrupt sources */ + imrp = coldfire_irqnum_to_mem(MCFINT_VECBASE); + *imrp = 0xfffffffe; + +#if defined(MCFINT_INTC1_VECBASE) + icrp = (u8 *)MCF_IPSBAR + MCFICM_INTC1 + MCFINTC_ICR0; + for (i = 1; i <= 63; i++) + icrp[i] = i; + + imrp = coldfire_irqnum_to_mem(MCFINT_INTC1_VECBASE); + *imrp = 0xfffffffe; +#endif +} diff --git a/arch/m68knommu/platform/coldfire/pit.c b/arch/m68knommu/platform/coldfire/pit.c index 4290638..5465373 100644 --- a/arch/m68knommu/platform/coldfire/pit.c +++ b/arch/m68knommu/platform/coldfire/pit.c @@ -18,7 +18,7 @@ #include #include #include -#include +#include #include #include #include @@ -33,22 +33,86 @@ #define FREQ ((MCF_CLK / 2) / 64) #define TA(a) (MCF_IPSBAR + MCFPIT_BASE1 + (a)) #define INTC0 (MCF_IPSBAR + MCFICM_INTC0) +#define PIT_CYCLES_PER_JIFFY (FREQ / HZ) -static u32 pit_cycles_per_jiffy; static u32 pit_cnt; +/* + * Initialize the PIT timer. + * + * This is also called after resume to bring the PIT into operation again. + */ + +static void init_cf_pit_timer(enum clock_event_mode mode, + struct clock_event_device *evt) +{ + switch (mode) { + case CLOCK_EVT_MODE_PERIODIC: + + __raw_writew(MCFPIT_PCSR_DISABLE, TA(MCFPIT_PCSR)); + __raw_writew(PIT_CYCLES_PER_JIFFY, TA(MCFPIT_PMR)); + __raw_writew(MCFPIT_PCSR_EN | MCFPIT_PCSR_PIE | \ + MCFPIT_PCSR_OVW | MCFPIT_PCSR_RLD | \ + MCFPIT_PCSR_CLK64, TA(MCFPIT_PCSR)); + break; + + case CLOCK_EVT_MODE_SHUTDOWN: + case CLOCK_EVT_MODE_UNUSED: + + __raw_writew(MCFPIT_PCSR_DISABLE, TA(MCFPIT_PCSR)); + break; + + case CLOCK_EVT_MODE_ONESHOT: + + __raw_writew(MCFPIT_PCSR_DISABLE, TA(MCFPIT_PCSR)); + __raw_writew(MCFPIT_PCSR_EN | MCFPIT_PCSR_PIE | \ + MCFPIT_PCSR_OVW | MCFPIT_PCSR_CLK64, \ + TA(MCFPIT_PCSR)); + break; + + case CLOCK_EVT_MODE_RESUME: + /* Nothing to do here */ + break; + } +} + +/* + * Program the next event in oneshot mode + * + * Delta is given in PIT ticks + */ +static int cf_pit_next_event(unsigned long delta, + struct clock_event_device *evt) +{ + __raw_writew(delta, TA(MCFPIT_PMR)); + return 0; +} + +struct clock_event_device cf_pit_clockevent = { + .name = "pit", + .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, + .set_mode = init_cf_pit_timer, + .set_next_event = cf_pit_next_event, + .shift = 32, + .irq = MCFINT_VECBASE + MCFINT_PIT1, +}; + + + /***************************************************************************/ static irqreturn_t pit_tick(int irq, void *dummy) { + struct clock_event_device *evt = &cf_pit_clockevent; u16 pcsr; /* Reset the ColdFire timer */ pcsr = __raw_readw(TA(MCFPIT_PCSR)); __raw_writew(pcsr | MCFPIT_PCSR_PIF, TA(MCFPIT_PCSR)); - pit_cnt += pit_cycles_per_jiffy; - return arch_timer_interrupt(irq, dummy); + pit_cnt += PIT_CYCLES_PER_JIFFY; + evt->event_handler(evt); + return IRQ_HANDLED; } /***************************************************************************/ @@ -72,14 +136,14 @@ static cycle_t pit_read_clk(void) cycles = pit_cnt; local_irq_restore(flags); - return cycles + pit_cycles_per_jiffy - pcntr; + return cycles + PIT_CYCLES_PER_JIFFY - pcntr; } /***************************************************************************/ static struct clocksource pit_clk = { .name = "pit", - .rating = 250, + .rating = 100, .read = pit_read_clk, .shift = 20, .mask = CLOCKSOURCE_MASK(32), @@ -92,20 +156,23 @@ void hw_timer_init(void) { u32 imr; + cf_pit_clockevent.cpumask = cpumask_of_cpu(smp_processor_id()); + cf_pit_clockevent.mult = div_sc(FREQ, NSEC_PER_SEC, 32); + cf_pit_clockevent.max_delta_ns = + clockevent_delta2ns(0xFFFF, &cf_pit_clockevent); + cf_pit_clockevent.min_delta_ns = + clockevent_delta2ns(0x3f, &cf_pit_clockevent); + clockevents_register_device(&cf_pit_clockevent); + setup_irq(MCFINT_VECBASE + MCFINT_PIT1, &pit_irq); +#if !defined(CONFIG_M523x) __raw_writeb(ICR_INTRCONF, INTC0 + MCFINTC_ICR0 + MCFINT_PIT1); imr = __raw_readl(INTC0 + MCFPIT_IMR); imr &= ~MCFPIT_IMR_IBIT; __raw_writel(imr, INTC0 + MCFPIT_IMR); - /* Set up PIT timer 1 as poll clock */ - pit_cycles_per_jiffy = FREQ / HZ; - __raw_writew(MCFPIT_PCSR_DISABLE, TA(MCFPIT_PCSR)); - __raw_writew(pit_cycles_per_jiffy, TA(MCFPIT_PMR)); - __raw_writew(MCFPIT_PCSR_EN | MCFPIT_PCSR_PIE | MCFPIT_PCSR_OVW | - MCFPIT_PCSR_RLD | MCFPIT_PCSR_CLK64, TA(MCFPIT_PCSR)); - +#endif pit_clk.mult = clocksource_hz2mult(FREQ, pit_clk.shift); clocksource_register(&pit_clk); } diff --git a/drivers/net/fec.c b/drivers/net/fec.c index 32a4f17..ecd5c71 100644 --- a/drivers/net/fec.c +++ b/drivers/net/fec.c @@ -2,12 +2,6 @@ * Fast Ethernet Controller (FEC) driver for Motorola MPC8xx. * Copyright (c) 1997 Dan Malek (dmalek@jlc.net) * - * This version of the driver is specific to the FADS implementation, - * since the board contains control registers external to the processor - * for the control of the LevelOne LXT970 transceiver. The MPC860T manual - * describes connections using the internal parallel port I/O, which - * is basically all of Port D. - * * Right now, I am very wasteful with the buffers. I allocate memory * pages and then divide them into 2K frame buffers. This way I know I * have buffers large enough to hold one frame within one buffer descriptor. @@ -49,17 +43,9 @@ #include #include -#if defined(CONFIG_M523x) || defined(CONFIG_M527x) || \ - defined(CONFIG_M5272) || defined(CONFIG_M528x) || \ - defined(CONFIG_M520x) || defined(CONFIG_M532x) #include #include #include "fec.h" -#else -#include -#include -#include "commproc.h" -#endif #if defined(CONFIG_FEC2) #define FEC_MAX_PORTS 2 @@ -67,7 +53,7 @@ #define FEC_MAX_PORTS 1 #endif -#if defined(CONFIG_FADS) || defined(CONFIG_RPXCLASSIC) || defined(CONFIG_M5272) +#if defined(CONFIG_M5272) #define HAVE_mii_link_interrupt #endif @@ -1235,14 +1221,9 @@ static phy_info_t const * const phy_info[] = { /* ------------------------------------------------------------------------- */ #ifdef HAVE_mii_link_interrupt -#ifdef CONFIG_RPXCLASSIC -static void -mii_link_interrupt(void *dev_id); -#else static irqreturn_t mii_link_interrupt(int irq, void * dev_id); #endif -#endif #if defined(CONFIG_M5272) /* @@ -1795,24 +1776,6 @@ static void __inline__ fec_request_intrs(struct net_device *dev) if (request_8xxirq(FEC_INTERRUPT, fec_enet_interrupt, 0, "fec", dev) != 0) panic("Could not allocate FEC IRQ!"); - -#ifdef CONFIG_RPXCLASSIC - /* Make Port C, bit 15 an input that causes interrupts. - */ - immap->im_ioport.iop_pcpar &= ~0x0001; - immap->im_ioport.iop_pcdir &= ~0x0001; - immap->im_ioport.iop_pcso &= ~0x0001; - immap->im_ioport.iop_pcint |= 0x0001; - cpm_install_handler(CPMVEC_PIO_PC15, mii_link_interrupt, dev); - - /* Make LEDS reflect Link status. - */ - *((uint *) RPX_CSR_ADDR) &= ~BCSR2_FETHLEDMODE; -#endif -#ifdef CONFIG_FADS - if (request_8xxirq(SIU_IRQ2, mii_link_interrupt, 0, "mii", dev) != 0) - panic("Could not allocate MII IRQ!"); -#endif } static void __inline__ fec_get_mac(struct net_device *dev) @@ -1821,16 +1784,6 @@ static void __inline__ fec_get_mac(struct net_device *dev) bd = (bd_t *)__res; memcpy(dev->dev_addr, bd->bi_enetaddr, ETH_ALEN); - -#ifdef CONFIG_RPXCLASSIC - /* The Embedded Planet boards have only one MAC address in - * the EEPROM, but can have two Ethernet ports. For the - * FEC port, we create another address by setting one of - * the address bits above something that would have (up to - * now) been allocated. - */ - dev->dev_adrd[3] |= 0x80; -#endif } static void __inline__ fec_set_mii(struct net_device *dev, struct fec_enet_private *fep) @@ -2109,13 +2062,8 @@ mii_discover_phy(uint mii_reg, struct net_device *dev) /* This interrupt occurs when the PHY detects a link change. */ #ifdef HAVE_mii_link_interrupt -#ifdef CONFIG_RPXCLASSIC -static void -mii_link_interrupt(void *dev_id) -#else static irqreturn_t mii_link_interrupt(int irq, void * dev_id) -#endif { struct net_device *dev = dev_id; struct fec_enet_private *fep = netdev_priv(dev); diff --git a/drivers/serial/mcfserial.c b/drivers/serial/mcfserial.c index 56007cc..b8de3c6 100644 --- a/drivers/serial/mcfserial.c +++ b/drivers/serial/mcfserial.c @@ -65,7 +65,8 @@ struct timer_list mcfrs_timer_struct; #define CONSOLE_BAUD_RATE 115200 #define DEFAULT_CBAUD B115200 #elif defined(CONFIG_ARNEWSH) || defined(CONFIG_FREESCALE) || \ - defined(CONFIG_senTec) || defined(CONFIG_SNEHA) || defined(CONFIG_AVNET) + defined(CONFIG_senTec) || defined(CONFIG_SNEHA) || defined(CONFIG_AVNET) || \ + defined(CONFIG_SAVANT) #define CONSOLE_BAUD_RATE 19200 #define DEFAULT_CBAUD B19200 #endif @@ -324,7 +325,7 @@ static void mcfrs_start(struct tty_struct *tty) * ----------------------------------------------------------------------- */ -static inline void receive_chars(struct mcf_serial *info) +static noinline void receive_chars(struct mcf_serial *info) { volatile unsigned char *uartp; struct tty_struct *tty = info->tty; @@ -369,7 +370,7 @@ static inline void receive_chars(struct mcf_serial *info) return; } -static inline void transmit_chars(struct mcf_serial *info) +static noinline void transmit_chars(struct mcf_serial *info) { volatile unsigned char *uartp; @@ -1479,14 +1480,28 @@ int mcfrs_open(struct tty_struct *tty, struct file * filp) /* * Based on the line number set up the internal interrupt stuff. */ -static void mcfrs_irqinit(struct mcf_serial *info) +static int __init mcfrs_irqinit(struct mcf_serial *info) { + volatile unsigned char *uartp; + int ret; + + uartp = info->addr; + /* Clear mask, so no surprise interrupts. */ + uartp[MCFUART_UIMR] = 0; + + ret = request_irq(info->irq, mcfrs_interrupt, IRQF_DISABLED, + "ColdFire UART", NULL); + if (ret) { + printk("MCFRS: Unable to attach ColdFire UART %d interrupt " + "vector=%d, error: %d\n", info->line, + info->irq, ret); + return ret; + } + #if defined(CONFIG_M5272) volatile unsigned long *icrp; volatile unsigned long *portp; - volatile unsigned char *uartp; - uartp = info->addr; icrp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_ICR2); switch (info->line) { @@ -1508,11 +1523,10 @@ static void mcfrs_irqinit(struct mcf_serial *info) portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PDCNT); *portp = (*portp & ~0x000003fc) | 0x000002a8; #elif defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) - volatile unsigned char *icrp, *uartp; +#if !defined(CONFIG_M523x) + volatile unsigned char *icrp; volatile unsigned long *imrp; - uartp = info->addr; - icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 + MCFINTC_ICR0 + MCFINT_UART0 + info->line); *icrp = 0x30 + info->line; /* level 6, line based priority */ @@ -1520,6 +1534,14 @@ static void mcfrs_irqinit(struct mcf_serial *info) imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 + MCFINTC_IMRL); *imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1); +#endif +#if defined(CONFIG_M523x) + { + volatile unsigned short *par_uartp; + par_uartp = (volatile unsigned short *) (MCF_MBAR + MCF523x_GPIO_PAR_UART); + *par_uartp = 0x3FFF; /* setup GPIO for UART0, UART1 & UART2 */ + } +#endif #if defined(CONFIG_M527x) { /* @@ -1544,37 +1566,38 @@ static void mcfrs_irqinit(struct mcf_serial *info) } #endif #elif defined(CONFIG_M520x) - volatile unsigned char *icrp, *uartp; - volatile unsigned long *imrp; - - uartp = info->addr; - - icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 + - MCFINTC_ICR0 + MCFINT_UART0 + info->line); - *icrp = 0x03; - - imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 + - MCFINTC_IMRL); - *imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1); - if (info->line < 2) { - unsigned short *uart_par; - uart_par = (unsigned short *)(MCF_IPSBAR + MCF_GPIO_PAR_UART); - if (info->line == 0) - *uart_par |= MCF_GPIO_PAR_UART_PAR_UTXD0 - | MCF_GPIO_PAR_UART_PAR_URXD0; - else if (info->line == 1) - *uart_par |= MCF_GPIO_PAR_UART_PAR_UTXD1 - | MCF_GPIO_PAR_UART_PAR_URXD1; + { + volatile unsigned char *icrp; + volatile unsigned long *imrp; + + icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 + + MCFINTC_ICR0 + MCFINT_UART0 + info->line); + *icrp = 0x03; + + imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 + + MCFINTC_IMRL); + *imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1); + if (info->line < 2) { + unsigned short *uart_par; + uart_par = (unsigned short *)(MCF_IPSBAR + + MCF_GPIO_PAR_UART); + if (info->line == 0) + *uart_par |= MCF_GPIO_PAR_UART_PAR_UTXD0 + | MCF_GPIO_PAR_UART_PAR_URXD0; + else if (info->line == 1) + *uart_par |= MCF_GPIO_PAR_UART_PAR_UTXD1 + | MCF_GPIO_PAR_UART_PAR_URXD1; } else if (info->line == 2) { unsigned char *feci2c_par; - feci2c_par = (unsigned char *)(MCF_IPSBAR + MCF_GPIO_PAR_FECI2C); + feci2c_par = (unsigned char *)(MCF_IPSBAR + + MCF_GPIO_PAR_FECI2C); *feci2c_par &= ~0x0F; *feci2c_par |= MCF_GPIO_PAR_FECI2C_PAR_SCL_UTXD2 - | MCF_GPIO_PAR_FECI2C_PAR_SDA_URXD2; + | MCF_GPIO_PAR_FECI2C_PAR_SDA_URXD2; } + } #elif defined(CONFIG_M532x) - volatile unsigned char *uartp; - uartp = info->addr; + switch (info->line) { case 0: MCF_INTC0_ICR26 = 0x3; @@ -1595,7 +1618,6 @@ static void mcfrs_irqinit(struct mcf_serial *info) break; } #else - volatile unsigned char *icrp, *uartp; switch (info->line) { case 0: @@ -1613,23 +1635,12 @@ static void mcfrs_irqinit(struct mcf_serial *info) default: printk("MCFRS: don't know how to handle UART %d interrupt?\n", info->line); - return; + return -ENODEV; } - uartp = info->addr; uartp[MCFUART_UIVR] = info->irq; #endif - - /* Clear mask, so no surprise interrupts. */ - uartp[MCFUART_UIMR] = 0; - - if (request_irq(info->irq, mcfrs_interrupt, IRQF_DISABLED, - "ColdFire UART", NULL)) { - printk("MCFRS: Unable to attach ColdFire UART %d interrupt " - "vector=%d\n", info->line, info->irq); - } - - return; + return 0; } @@ -1719,7 +1730,6 @@ static int __init mcfrs_init(void) { struct mcf_serial *info; - unsigned long flags; int i; /* Setup base handler, and timer table. */ @@ -1759,12 +1769,12 @@ mcfrs_init(void) return(-EBUSY); } - local_irq_save(flags); - /* * Configure all the attached serial ports. */ for (i = 0, info = mcfrs_table; (i < NR_PORTS); i++, info++) { + int ret; + info->magic = SERIAL_MAGIC; info->line = i; info->tty = 0; @@ -1782,14 +1792,11 @@ mcfrs_init(void) info->imr = 0; mcfrs_setsignals(info, 0, 0); - mcfrs_irqinit(info); - - printk("ttyS%d at 0x%04x (irq = %d)", info->line, - (unsigned int) info->addr, info->irq); - printk(" is a builtin ColdFire UART\n"); + ret = mcfrs_irqinit(info); + if (!ret) + printk("ttyS%d at 0x%p (irq = %d) is a builtin " + "ColdFire UART\n", info->line, info->addr, info->irq); } - - local_irq_restore(flags); return 0; } diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index f054778..4f1feae 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -6,6 +6,10 @@ #define VMLINUX_SYMBOL(_sym_) _sym_ #endif +#ifndef OUTPUT_DATA_SECTION +#define OUTPUT_DATA_SECTION +#endif + /* Align . to a 8 byte boundary equals to maximum function alignment. */ #define ALIGN_FUNCTION() . = ALIGN(8) @@ -61,11 +65,11 @@ *(.rodata) *(.rodata.*) \ *(__vermagic) /* Kernel version magic */ \ *(__markers_strings) /* Markers: strings */ \ - } \ + } OUTPUT_DATA_SECTION \ \ .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ *(.rodata1) \ - } \ + } OUTPUT_DATA_SECTION \ \ /* PCI quirks */ \ .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ @@ -84,89 +88,89 @@ VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ *(.pci_fixup_resume) \ VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ - } \ + } OUTPUT_DATA_SECTION \ \ /* RapidIO route ops */ \ .rio_route : AT(ADDR(.rio_route) - LOAD_OFFSET) { \ VMLINUX_SYMBOL(__start_rio_route_ops) = .; \ *(.rio_route_ops) \ VMLINUX_SYMBOL(__end_rio_route_ops) = .; \ - } \ + } OUTPUT_DATA_SECTION \ \ /* Kernel symbol table: Normal symbols */ \ __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ VMLINUX_SYMBOL(__start___ksymtab) = .; \ *(__ksymtab) \ VMLINUX_SYMBOL(__stop___ksymtab) = .; \ - } \ + } OUTPUT_DATA_SECTION \ \ /* Kernel symbol table: GPL-only symbols */ \ __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ *(__ksymtab_gpl) \ VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ - } \ + } OUTPUT_DATA_SECTION \ \ /* Kernel symbol table: Normal unused symbols */ \ __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ *(__ksymtab_unused) \ VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ - } \ + } OUTPUT_DATA_SECTION \ \ /* Kernel symbol table: GPL-only unused symbols */ \ __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ *(__ksymtab_unused_gpl) \ VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ - } \ + } OUTPUT_DATA_SECTION \ \ /* Kernel symbol table: GPL-future-only symbols */ \ __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ *(__ksymtab_gpl_future) \ VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ - } \ + } OUTPUT_DATA_SECTION \ \ /* Kernel symbol table: Normal symbols */ \ __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ VMLINUX_SYMBOL(__start___kcrctab) = .; \ *(__kcrctab) \ VMLINUX_SYMBOL(__stop___kcrctab) = .; \ - } \ + } OUTPUT_DATA_SECTION \ \ /* Kernel symbol table: GPL-only symbols */ \ __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ *(__kcrctab_gpl) \ VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ - } \ + } OUTPUT_DATA_SECTION \ \ /* Kernel symbol table: Normal unused symbols */ \ __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ *(__kcrctab_unused) \ VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ - } \ + } OUTPUT_DATA_SECTION \ \ /* Kernel symbol table: GPL-only unused symbols */ \ __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ *(__kcrctab_unused_gpl) \ VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ - } \ + } OUTPUT_DATA_SECTION \ \ /* Kernel symbol table: GPL-future-only symbols */ \ __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ *(__kcrctab_gpl_future) \ VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ - } \ + } OUTPUT_DATA_SECTION \ \ /* Kernel symbol table: strings */ \ __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ *(__ksymtab_strings) \ - } \ + } OUTPUT_DATA_SECTION \ \ /* __*init sections */ \ __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ @@ -177,7 +181,7 @@ CPU_KEEP(exit.rodata) \ MEM_KEEP(init.rodata) \ MEM_KEEP(exit.rodata) \ - } \ + } OUTPUT_DATA_SECTION \ \ /* Built-in module parameters. */ \ __param : AT(ADDR(__param) - LOAD_OFFSET) { \ @@ -186,7 +190,8 @@ VMLINUX_SYMBOL(__stop___param) = .; \ . = ALIGN((align)); \ VMLINUX_SYMBOL(__end_rodata) = .; \ - } \ + } OUTPUT_DATA_SECTION \ + \ . = ALIGN((align)); /* RODATA provided for backward compatibility. @@ -316,7 +321,7 @@ __start___bug_table = .; \ *(__bug_table) \ __stop___bug_table = .; \ - } + } OUTPUT_DATA_SECTION #define NOTES \ .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ @@ -350,5 +355,5 @@ .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \ *(.data.percpu) \ *(.data.percpu.shared_aligned) \ - } \ + } OUTPUT_DATA_SECTION \ __per_cpu_end = .; diff --git a/include/asm-m68knommu/bitops.h b/include/asm-m68knommu/bitops.h index c142fbf..1af5ac4 100644 --- a/include/asm-m68knommu/bitops.h +++ b/include/asm-m68knommu/bitops.h @@ -14,8 +14,38 @@ #error only can be included directly #endif +#if defined (__mcfisaaplus__) || defined (__mcfisac__) +static inline int ffs(unsigned int val) +{ + if (!val) + return 0; + + asm volatile( + "bitrev %0\n\t" + "ff1 %0\n\t" + : "=d" (val) + : "0" (val) + ); + val++; + return val; +} + +static inline int __ffs(unsigned int val) +{ + asm volatile( + "bitrev %0\n\t" + "ff1 %0\n\t" + : "=d" (val) + : "0" (val) + ); + return val; +} + +#else #include #include +#endif + #include #include diff --git a/include/asm-m68knommu/byteorder.h b/include/asm-m68knommu/byteorder.h index 8fcde90..20bb442 100644 --- a/include/asm-m68knommu/byteorder.h +++ b/include/asm-m68knommu/byteorder.h @@ -1,13 +1,27 @@ #ifndef _M68KNOMMU_BYTEORDER_H #define _M68KNOMMU_BYTEORDER_H -#include +#include #if defined(__GNUC__) && !defined(__STRICT_ANSI__) || defined(__KERNEL__) # define __BYTEORDER_HAS_U64__ # define __SWAB_64_THRU_32__ #endif +#if defined (__mcfisaaplus__) || defined (__mcfisac__) +static inline __attribute_const__ __u32 ___arch__swab32(__u32 val) +{ + asm( + "byterev %0" + : "=d" (val) + : "0" (val) + ); + return val; +} + +#define __arch__swab32(x) ___arch__swab32(x) +#endif + #include #endif /* _M68KNOMMU_BYTEORDER_H */ diff --git a/include/asm-m68knommu/commproc.h b/include/asm-m68knommu/commproc.h index 36e870b..edf5eb6 100644 --- a/include/asm-m68knommu/commproc.h +++ b/include/asm-m68knommu/commproc.h @@ -519,25 +519,6 @@ typedef struct scc_enet { #define SICR_ENET_CLKRT ((uint)0x00002c00) #endif -#ifdef CONFIG_RPXCLASSIC -/* Bits in parallel I/O port registers that have to be set/cleared - * to configure the pins for SCC1 use. - */ -#define PA_ENET_RXD ((ushort)0x0001) -#define PA_ENET_TXD ((ushort)0x0002) -#define PA_ENET_TCLK ((ushort)0x0200) -#define PA_ENET_RCLK ((ushort)0x0800) -#define PB_ENET_TENA ((uint)0x00001000) -#define PC_ENET_CLSN ((ushort)0x0010) -#define PC_ENET_RENA ((ushort)0x0020) - -/* Control bits in the SICR to route TCLK (CLK2) and RCLK (CLK4) to - * SCC1. Also, make sure GR1 (bit 24) and SC1 (bit 25) are zero. - */ -#define SICR_ENET_MASK ((uint)0x000000ff) -#define SICR_ENET_CLKRT ((uint)0x0000003d) -#endif - /* SCC Event register as used by Ethernet. */ #define SCCE_ENET_GRA ((ushort)0x0080) /* Graceful stop complete */ diff --git a/include/asm-m68knommu/m523xsim.h b/include/asm-m68knommu/m523xsim.h index bf39731..6542bc8 100644 --- a/include/asm-m68knommu/m523xsim.h +++ b/include/asm-m68knommu/m523xsim.h @@ -11,7 +11,6 @@ #define m523xsim_h /****************************************************************************/ - /* * Define the 523x SIM register set addresses. */ @@ -27,10 +26,35 @@ #define MCFINTC_IACKL 0x19 /* */ #define MCFINTC_ICR0 0x40 /* Base ICR register */ +/* INTC0 - interrupt numbers */ #define MCFINT_VECBASE 64 /* Vector base number */ -#define MCFINT_UART0 13 /* Interrupt number for UART0 */ -#define MCFINT_PIT1 36 /* Interrupt number for PIT1 */ -#define MCFINT_QSPI 18 /* Interrupt number for QSPI */ +#define MCFINT_EPF4 4 /* EPORT4 */ +#define MCFINT_EPF5 5 /* EPORT5 */ +#define MCFINT_EPF6 6 /* EPORT6 */ +#define MCFINT_EPF7 7 /* EPORT7 */ +#define MCFINT_UART0 13 /* UART0 */ +#define MCFINT_QSPI 18 /* QSPI */ +#define MCFINT_PIT1 36 /* PIT1 */ +#define MCFINT_PER_INTC 64 + +/* INTC1 - interrupt numbers */ +#define MCFINT_INTC1_VECBASE (MCFINT_VECBASE + MCFINT_PER_INTC) +#define MCFINT_TC0F 27 /* eTPU Channel 0 */ +#define MCFINT_TC1F 28 /* eTPU Channel 1 */ +#define MCFINT_TC2F 29 /* eTPU Channel 2 */ +#define MCFINT_TC3F 30 /* eTPU Channel 3 */ +#define MCFINT_TC4F 31 /* eTPU Channel 4 */ +#define MCFINT_TC5F 32 /* eTPU Channel 5 */ +#define MCFINT_TC6F 33 /* eTPU Channel 6 */ +#define MCFINT_TC7F 34 /* eTPU Channel 7 */ +#define MCFINT_TC8F 35 /* eTPU Channel 8 */ +#define MCFINT_TC9F 36 /* eTPU Channel 9 */ +#define MCFINT_TC10F 37 /* eTPU Channel 10 */ +#define MCFINT_TC11F 38 /* eTPU Channel 11 */ +#define MCFINT_TC12F 39 /* eTPU Channel 12 */ +#define MCFINT_TC13F 40 /* eTPU Channel 13 */ +#define MCFINT_TC14F 41 /* eTPU Channel 14 */ +#define MCFINT_TC15F 42 /* eTPU Channel 15 */ /* * SDRAM configuration registers. @@ -41,5 +65,120 @@ #define MCFSIM_DACR1 0x50 /* SDRAM base address 1 */ #define MCFSIM_DMR1 0x54 /* SDRAM address mask 1 */ +/* + * GPIO Registers and Pin Assignments + */ +#define MCF_GPIO_PAR_FECI2C 0x100047 /* FEC Pin Assignment reg */ +#define MCF523x_GPIO_PAR_UART 0x100048 /* UART Pin Assignment reg */ +#define MCF523x_GPIO_PAR_QSPI 0x10004a /* QSPI Pin Assignment reg */ +#define MCF523x_GPIO_PAR_TIMER 0x10004c /* TIMER Pin Assignment reg */ +#define MCF523x_GPIO_PDDR_QSPI 0x10001a /* QSPI Pin Direction reg */ +#define MCF523x_GPIO_PDDR_TIMER 0x10001b /* TIMER Pin Direction reg */ +#define MCF523x_GPIO_PPDSDR_QSPI 0x10002a /* QSPI Pin Data reg */ +#define MCF523x_GPIO_PPDSDR_TIMER 0x10002b /* TIMER Pin Data reg */ + +#define MCF_GPIO_PAR_FECI2C_PAR_SDA(x) (((x) & 0x03) << 0) +#define MCF_GPIO_PAR_FECI2C_PAR_SCL(x) (((x) & 0x03) << 2) + +/* + * eTPU Registers + */ +#define MCF523x_ETPU 0x1d0000 /* eTPU Base */ +#define MCF523x_ETPU_CIOSR 0x00220 /* eTPU Intr Overflow Status */ +#define MCF523x_ETPU_CIER 0x00240 /* eTPU Intr Enable */ +#define MCF523x_ETPU_CR(c) (0x00400 + ((c) * 0x10)) /* eTPU c Config */ +#define MCF523x_ETPU_SCR(c) (0x00404 + ((c) * 0x10)) /* eTPU c Status & Ctrl */ +#define MCF523x_ETPU_SDM 0x08000 /* eTPU Shared Data Memory */ + +/* + * WDOG registers + */ +#define MCF523x_WCR ((volatile uint16_t *) (MCF_IPSBAR + 0x140000)) /* control register 16 bits */ +#define MCF523x_WMR ((volatile uint16_t *) (MCF_IPSBAR + 0x140002)) /* modulus status 16 bits */ +#define MCF523x_MCNTR ((volatile uint16_t *) (MCF_IPSBAR + 0x140004)) /* count register 16 bits */ +#define MCF523x_WSR ((volatile uint16_t *) (MCF_IPSBAR + 0x140006)) /* service register 16 bits */ + +/* + * Reset registers + */ +#define MCF523x_RSR ((volatile uint8_t *) (MCF_IPSBAR + 0x110001)) /* reset reason codes */ + +/* + * WDOG bit level definitions and macros. + */ +#define MCF523x_WCR_ENABLE_BIT 0x0001 + +#define MCF523x_WCR_ENABLE 0x0001 +#define MCF523x_WCR_DISABLE 0x0000 +#define MCF523x_WCR_HALTEDSTOP 0x0002 +#define MCF523x_WCR_HALTEDRUN 0x0000 +#define MCF523x_WCR_DOZESTOP 0x0004 +#define MCF523x_WCR_DOZERUN 0x0000 +#define MCF523x_WCR_WAITSTOP 0x0008 +#define MCF523x_WCR_WAITRUN 0x0000 + +#define MCF523x_WMR_DEFAULT_VALUE 0xffff + +/* + * Inter-IC (I2C) Module + * Read/Write access macros for general use + */ +#define MCF_I2C_I2ADR ((volatile u8 *) (MCF_IPSBAR + 0x0300)) /* Address */ +#define MCF_I2C_I2FDR ((volatile u8 *) (MCF_IPSBAR + 0x0304)) /* Freq Divider */ +#define MCF_I2C_I2CR ((volatile u8 *) (MCF_IPSBAR + 0x0308)) /* Control */ +#define MCF_I2C_I2SR ((volatile u8 *) (MCF_IPSBAR + 0x030C)) /* Status */ +#define MCF_I2C_I2DR ((volatile u8 *) (MCF_IPSBAR + 0x0310)) /* Data I/O */ + +/* + * Bit level definitions and macros + */ +#define MCF_I2C_I2ADR_ADDR(x) (((x) & 0x7F) << 0x01) +#define MCF_I2C_I2FDR_IC(x) ((x) & 0x3F) + +#define MCF_I2C_I2CR_IEN 0x80 /* I2C enable */ +#define MCF_I2C_I2CR_IIEN 0x40 /* interrupt enable */ +#define MCF_I2C_I2CR_MSTA 0x20 /* master/slave mode */ +#define MCF_I2C_I2CR_MTX 0x10 /* transmit/receive mode */ +#define MCF_I2C_I2CR_TXAK 0x08 /* transmit acknowledge enable */ +#define MCF_I2C_I2CR_RSTA 0x04 /* repeat start */ + +#define MCF_I2C_I2SR_ICF 0x80 /* data transfer bit */ +#define MCF_I2C_I2SR_IAAS 0x40 /* I2C addressed as a slave */ +#define MCF_I2C_I2SR_IBB 0x20 /* I2C bus busy */ +#define MCF_I2C_I2SR_IAL 0x10 /* aribitration lost */ +#define MCF_I2C_I2SR_SRW 0x04 /* slave read/write */ +#define MCF_I2C_I2SR_IIF 0x02 /* I2C interrupt */ +#define MCF_I2C_I2SR_RXAK 0x01 /* received acknowledge */ + +/* + * Edge Port (EPORT) Module + */ +#define MCF523x_EPPAR 0x130000 +#define MCF523x_EPDDR 0x130002 +#define MCF523x_EPIER 0x130003 +#define MCF523x_EPDR 0x130004 +#define MCF523x_EPPDR 0x130005 +#define MCF523x_EPFR 0x130006 + +/* + * Chip Select (CS) Module + */ +#define MCF523x_CSAR0 0x80 +#define MCF523x_CSAR3 0xA4 +#define MCF523x_CSMR3 0xA8 + +/* + * System Access Control Unit (SACU) + */ +#define MCF523x_PACR1 0x25 +#define MCF523x_PACR2 0x26 +#define MCF523x_PACR3 0x27 +#define MCF523x_PACR4 0x28 +#define MCF523x_PACR5 0x2A +#define MCF523x_PACR6 0x2B +#define MCF523x_PACR7 0x2C +#define MCF523x_PACR8 0x2E +#define MCF523x_GPACR 0x30 + /****************************************************************************/ #endif /* m523xsim_h */ diff --git a/include/asm-m68knommu/m528xsim.h b/include/asm-m68knommu/m528xsim.h index 28bf783..1b8c39e 100644 --- a/include/asm-m68knommu/m528xsim.h +++ b/include/asm-m68knommu/m528xsim.h @@ -30,6 +30,9 @@ #define MCFINT_VECBASE 64 /* Vector base number */ #define MCFINT_UART0 13 /* Interrupt number for UART0 */ #define MCFINT_PIT1 55 /* Interrupt number for PIT1 */ +#define MCFINT_QSPI 18 /* Interrupt number for QSPI */ + +#define MCF5282_INTC0 (MCF_IPSBAR + MCFICM_INTC0) /* * SDRAM configuration registers. @@ -50,44 +53,53 @@ /* Port UA Pin Assignment Register (8 Bit) */ #define MCF5282_GPIO_PUAPAR 0x10005C +#define MCF5282_GPIO_PORTQS (*(volatile u8 *) (MCF_IPSBAR + 0x0010000D)) +#define MCF5282_GPIO_DDRQS (*(volatile u8 *) (MCF_IPSBAR + 0x00100021)) +#define MCF5282_GPIO_PORTQSP (*(volatile u8 *) (MCF_IPSBAR + 0x00100035)) +#define MCF5282_GPIO_PQSPAR (*(volatile u8 *) (MCF_IPSBAR + 0x00100059)) + +#define MCF5282_GPIO_PEPAR (*(volatile u16 *) (MCF_IPSBAR + 0x00100052)) + +#define MCF5282_GPIO_PORTE (*(volatile u8 *) (MCF_IPSBAR + 0x00100004)) +#define MCF5282_GPIO_DDRE (*(volatile u8 *) (MCF_IPSBAR + 0x00100018)) +#define MCF5282_GPIO_PORTEP (*(volatile u8 *) (MCF_IPSBAR + 0x0010002C)) + /* Interrupt Mask Register Register Low */ #define MCF5282_INTC0_IMRL (volatile u32 *) (MCF_IPSBAR + 0x0C0C) /* Interrupt Control Register 7 */ #define MCF5282_INTC0_ICR17 (volatile u8 *) (MCF_IPSBAR + 0x0C51) - - /********************************************************************* * * Inter-IC (I2C) Module * *********************************************************************/ /* Read/Write access macros for general use */ -#define MCF5282_I2C_I2ADR (volatile u8 *) (MCF_IPSBAR + 0x0300) // Address -#define MCF5282_I2C_I2FDR (volatile u8 *) (MCF_IPSBAR + 0x0304) // Freq Divider -#define MCF5282_I2C_I2CR (volatile u8 *) (MCF_IPSBAR + 0x0308) // Control -#define MCF5282_I2C_I2SR (volatile u8 *) (MCF_IPSBAR + 0x030C) // Status -#define MCF5282_I2C_I2DR (volatile u8 *) (MCF_IPSBAR + 0x0310) // Data I/O +#define MCF_I2C_I2ADR (volatile u8 *) (MCF_IPSBAR + 0x0300) // Address +#define MCF_I2C_I2FDR (volatile u8 *) (MCF_IPSBAR + 0x0304) // Freq Divider +#define MCF_I2C_I2CR (volatile u8 *) (MCF_IPSBAR + 0x0308) // Control +#define MCF_I2C_I2SR (volatile u8 *) (MCF_IPSBAR + 0x030C) // Status +#define MCF_I2C_I2DR (volatile u8 *) (MCF_IPSBAR + 0x0310) // Data I/O /* Bit level definitions and macros */ -#define MCF5282_I2C_I2ADR_ADDR(x) (((x)&0x7F)<<0x01) +#define MCF_I2C_I2ADR_ADDR(x) (((x)&0x7F)<<0x01) -#define MCF5282_I2C_I2FDR_IC(x) (((x)&0x3F)) +#define MCF_I2C_I2FDR_IC(x) (((x)&0x3F)) -#define MCF5282_I2C_I2CR_IEN (0x80) // I2C enable -#define MCF5282_I2C_I2CR_IIEN (0x40) // interrupt enable -#define MCF5282_I2C_I2CR_MSTA (0x20) // master/slave mode -#define MCF5282_I2C_I2CR_MTX (0x10) // transmit/receive mode -#define MCF5282_I2C_I2CR_TXAK (0x08) // transmit acknowledge enable -#define MCF5282_I2C_I2CR_RSTA (0x04) // repeat start +#define MCF_I2C_I2CR_IEN (0x80) // I2C enable +#define MCF_I2C_I2CR_IIEN (0x40) // interrupt enable +#define MCF_I2C_I2CR_MSTA (0x20) // master/slave mode +#define MCF_I2C_I2CR_MTX (0x10) // transmit/receive mode +#define MCF_I2C_I2CR_TXAK (0x08) // transmit acknowledge enable +#define MCF_I2C_I2CR_RSTA (0x04) // repeat start -#define MCF5282_I2C_I2SR_ICF (0x80) // data transfer bit -#define MCF5282_I2C_I2SR_IAAS (0x40) // I2C addressed as a slave -#define MCF5282_I2C_I2SR_IBB (0x20) // I2C bus busy -#define MCF5282_I2C_I2SR_IAL (0x10) // aribitration lost -#define MCF5282_I2C_I2SR_SRW (0x04) // slave read/write -#define MCF5282_I2C_I2SR_IIF (0x02) // I2C interrupt -#define MCF5282_I2C_I2SR_RXAK (0x01) // received acknowledge +#define MCF_I2C_I2SR_ICF (0x80) // data transfer bit +#define MCF_I2C_I2SR_IAAS (0x40) // I2C addressed as a slave +#define MCF_I2C_I2SR_IBB (0x20) // I2C bus busy +#define MCF_I2C_I2SR_IAL (0x10) // aribitration lost +#define MCF_I2C_I2SR_SRW (0x04) // slave read/write +#define MCF_I2C_I2SR_IIF (0x02) // I2C interrupt +#define MCF_I2C_I2SR_RXAK (0x01) // received acknowledge @@ -107,6 +119,11 @@ #define MCF5282_QSPI_QDR MCF_IPSBAR + 0x0354 #define MCF5282_QSPI_QCR MCF_IPSBAR + 0x0354 +#define MCF5282_QSPI_PAR (MCF_IPSBAR + 0x00100059) + +#define MCF5282_QSPI_IRQ_SOURCE 18 +#define MCF5282_QSPI_IRQ_VECTOR (64 + MCF5282_QSPI_IRQ_SOURCE) + /* Bit level definitions and macros */ #define MCF5282_QSPI_QMR_MSTR (0x8000) #define MCF5282_QSPI_QMR_DOHIE (0x4000) diff --git a/include/asm-m68knommu/m532xsim.h b/include/asm-m68knommu/m532xsim.h index 1835fd2..a16a3c7 100644 --- a/include/asm-m68knommu/m532xsim.h +++ b/include/asm-m68knommu/m532xsim.h @@ -16,6 +16,7 @@ #define MCFINT_VECBASE 64 #define MCFINT_UART0 26 /* Interrupt number for UART0 */ #define MCFINT_UART1 27 /* Interrupt number for UART1 */ +#define MCFINT_UART2 28 /* Interrupt number for UART2 */ #define MCF_WTM_WCR MCF_REG16(0xFC098000) @@ -72,9 +73,21 @@ #define mcf_getimr() \ *((volatile unsigned long *) (MCF_MBAR + MCFSIM_IMR)) +#define mcf_getimrh() \ + *((volatile unsigned long *) (MCF_MBAR + MCFSIM_IMRH)) + +#define mcf_getimrl() \ + *((volatile unsigned long *) (MCF_MBAR + MCFSIM_IMRL)) + #define mcf_setimr(imr) \ *((volatile unsigned long *) (MCF_MBAR + MCFSIM_IMR)) = (imr); +#define mcf_setimrh(imr) \ + *((volatile unsigned long *) (MCF_MBAR + MCFSIM_IMRH)) = (imr); + +#define mcf_setimrl(imr) \ + *((volatile unsigned long *) (MCF_MBAR + MCFSIM_IMRL)) = (imr); + #define mcf_getipr() \ *((volatile unsigned long *) (MCF_MBAR + MCFSIM_IPR)) @@ -131,31 +144,31 @@ *********************************************************************/ /* Read/Write access macros for general use */ -#define MCF532x_I2C_I2ADR (volatile u8 *) (0xFC058000) // Address -#define MCF532x_I2C_I2FDR (volatile u8 *) (0xFC058004) // Freq Divider -#define MCF532x_I2C_I2CR (volatile u8 *) (0xFC058008) // Control -#define MCF532x_I2C_I2SR (volatile u8 *) (0xFC05800C) // Status -#define MCF532x_I2C_I2DR (volatile u8 *) (0xFC058010) // Data I/O +#define MCF_I2C_I2ADR (volatile u8 *) (0xFC058000) /* Address */ +#define MCF_I2C_I2FDR (volatile u8 *) (0xFC058004) /* Freq Divider */ +#define MCF_I2C_I2CR (volatile u8 *) (0xFC058008) /* Control */ +#define MCF_I2C_I2SR (volatile u8 *) (0xFC05800C) /* Status */ +#define MCF_I2C_I2DR (volatile u8 *) (0xFC058010) /* Data I/O */ /* Bit level definitions and macros */ -#define MCF532x_I2C_I2ADR_ADDR(x) (((x)&0x7F)<<0x01) +#define MCF_I2C_I2ADR_ADDR(x) (((x)&0x7F)<<0x01) -#define MCF532x_I2C_I2FDR_IC(x) (((x)&0x3F)) +#define MCF_I2C_I2FDR_IC(x) (((x)&0x3F)) -#define MCF532x_I2C_I2CR_IEN (0x80) // I2C enable -#define MCF532x_I2C_I2CR_IIEN (0x40) // interrupt enable -#define MCF532x_I2C_I2CR_MSTA (0x20) // master/slave mode -#define MCF532x_I2C_I2CR_MTX (0x10) // transmit/receive mode -#define MCF532x_I2C_I2CR_TXAK (0x08) // transmit acknowledge enable -#define MCF532x_I2C_I2CR_RSTA (0x04) // repeat start +#define MCF_I2C_I2CR_IEN (0x80) /* I2C enable */ +#define MCF_I2C_I2CR_IIEN (0x40) /* interrupt enable */ +#define MCF_I2C_I2CR_MSTA (0x20) /* master/slave mode */ +#define MCF_I2C_I2CR_MTX (0x10) /* transmit/receive mode */ +#define MCF_I2C_I2CR_TXAK (0x08) /* transmit acknowledge enable */ +#define MCF_I2C_I2CR_RSTA (0x04) /* repeat start */ -#define MCF532x_I2C_I2SR_ICF (0x80) // data transfer bit -#define MCF532x_I2C_I2SR_IAAS (0x40) // I2C addressed as a slave -#define MCF532x_I2C_I2SR_IBB (0x20) // I2C bus busy -#define MCF532x_I2C_I2SR_IAL (0x10) // aribitration lost -#define MCF532x_I2C_I2SR_SRW (0x04) // slave read/write -#define MCF532x_I2C_I2SR_IIF (0x02) // I2C interrupt -#define MCF532x_I2C_I2SR_RXAK (0x01) // received acknowledge +#define MCF_I2C_I2SR_ICF (0x80) /* data transfer bit */ +#define MCF_I2C_I2SR_IAAS (0x40) /* I2C addressed as a slave */ +#define MCF_I2C_I2SR_IBB (0x20) /* I2C bus busy */ +#define MCF_I2C_I2SR_IAL (0x10) /* aribitration lost */ +#define MCF_I2C_I2SR_SRW (0x04) /* slave read/write */ +#define MCF_I2C_I2SR_IIF (0x02) /* I2C interrupt */ +#define MCF_I2C_I2SR_RXAK (0x01) /* received acknowledge */ #define MCF532x_PAR_FECI2C (volatile u8 *) (0xFC0A4053) @@ -2234,5 +2247,36 @@ #define MCF_EPORT_EPFR_EPF6 (0x40) #define MCF_EPORT_EPFR_EPF7 (0x80) +/********************************************************************* + * + * Cross-Bar Switch (XBS) + * + *********************************************************************/ +#define MCF_XBS_PRS1 MCF_REG32(0xFC004100) +#define MCF_XBS_CRS1 MCF_REG32(0xFC004110) +#define MCF_XBS_PRS4 MCF_REG32(0xFC004400) +#define MCF_XBS_CRS4 MCF_REG32(0xFC004410) +#define MCF_XBS_PRS6 MCF_REG32(0xFC004600) +#define MCF_XBS_CRS6 MCF_REG32(0xFC004610) +#define MCF_XBS_PRS7 MCF_REG32(0xFC004700) +#define MCF_XBS_CRS7 MCF_REG32(0xFC004710) + +#define MCF_XBS_PRIO_FACTTEST(x) (((x)&0x7) << 28) +#define MCF_XBS_PRIO_USBOTG(x) (((x)&0x7) << 24) +#define MCF_XBS_PRIO_USBHOST(x) (((x)&0x7) << 20) +#define MCF_XBS_PRIO_LCD(x) (((x)&0x7) << 16) +#define MCF_XBS_PRIO_FEC(x) (((x)&0x7) << 8) +#define MCF_XBS_PRIO_EDMA(x) (((x)&0x7) << 4) +#define MCF_XBS_PRIO_CORE(x) (((x)&0x7) << 0) + +#define MCF_PRIO_LVL_1 (0) +#define MCF_PRIO_LVL_2 (1) +#define MCF_PRIO_LVL_3 (2) +#define MCF_PRIO_LVL_4 (3) +#define MCF_PRIO_LVL_5 (4) +#define MCF_PRIO_LVL_6 (5) +#define MCF_PRIO_LVL_7 (6) + + /********************************************************************/ #endif /* m532xsim_h */ diff --git a/include/asm-m68knommu/system.h b/include/asm-m68knommu/system.h index 64c6443..40f49de 100644 --- a/include/asm-m68knommu/system.h +++ b/include/asm-m68knommu/system.h @@ -118,6 +118,8 @@ asmlinkage void resume(void); #define smp_read_barrier_depends() do { } while(0) #endif +#define read_barrier_depends() ((void)0) + #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) struct __xchg_dummy { unsigned long a[100]; }; @@ -310,4 +312,13 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz #endif #define arch_align_stack(x) (x) + +static inline int irqs_disabled_flags(unsigned long flags) +{ + if (flags & 0x0700) + return 0; + else + return 1; +} + #endif /* _M68KNOMMU_SYSTEM_H */ patches/pmtmr-override.patch0000664000076400007640000000205211043673337015240 0ustar tglxtglxSubject: pmtmr: allow command line override of ioport From: Thomas Gleixner Date: Wed, 21 May 2008 21:14:58 +0200 Signed-off-by: Thomas Gleixner --- drivers/clocksource/acpi_pm.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) Index: linux-2.6.26/drivers/clocksource/acpi_pm.c =================================================================== --- linux-2.6.26.orig/drivers/clocksource/acpi_pm.c +++ linux-2.6.26/drivers/clocksource/acpi_pm.c @@ -215,3 +215,22 @@ pm_good: * but we still need to load before device_initcall */ fs_initcall(init_acpi_pm_clocksource); + +/* + * Allow an override of the IOPort. Stupid BIOSes do not tell us about + * the PMTimer, but we might know where it is. + */ +static int __init parse_pmtmr(char *arg) +{ + unsigned long base; + char *e; + + base = simple_strtoul(arg, &e, 16); + + printk(KERN_INFO "PMTMR IOPort override: 0x%04lx -> 0x%04lx\n", + (unsigned long) pmtmr_ioport, base); + pmtmr_ioport = base; + + return 0; +} +__setup("pmtmr=", parse_pmtmr); patches/revert-preempt-bkl-revert.patch0000664000076400007640000002522011043564065017317 0ustar tglxtglxRevert this commit: [ basically, this is the -R of 8e3e076c5a78519a9f64cd384e8f18bc21882ce0 ] commit 8e3e076c5a78519a9f64cd384e8f18bc21882ce0 Author: Linus Torvalds Date: Sat May 10 20:58:02 2008 -0700 BKL: revert back to the old spinlock implementation The generic semaphore rewrite had a huge performance regression on AIM7 (and potentially other BKL-heavy benchmarks) because the generic semaphores had been rewritten to be simple to understand and fair. The latter, in particular, turns a semaphore-based BKL implementation into a mess of scheduling. The attempt to fix the performance regression failed miserably (see the previous commit 00b41ec2611dc98f87f30753ee00a53db648d662 'Revert "semaphore: fix"'), and so for now the simple and sane approach is to instead just go back to the old spinlock-based BKL implementation that never had any issues like this. This patch also has the advantage of being reported to fix the regression completely according to Yanmin Zhang, unlike the semaphore hack which still left a couple percentage point regression. As a spinlock, the BKL obviously has the potential to be a latency issue, but it's not really any different from any other spinlock in that respect. We do want to get rid of the BKL asap, but that has been the plan for several years. These days, the biggest users are in the tty layer (open/release in particular) and Alan holds out some hope: "tty release is probably a few months away from getting cured - I'm afraid it will almost certainly be the very last user of the BKL in tty to get fixed as it depends on everything else being sanely locked." so while we're not there yet, we do have a plan of action. Tested-by: Yanmin Zhang Cc: Ingo Molnar Cc: Andi Kleen Cc: Matthew Wilcox Cc: Alexander Viro Cc: Andrew Morton Signed-off-by: Linus Torvalds --- arch/mn10300/Kconfig | 11 ++++ include/linux/hardirq.h | 18 +++---- kernel/sched.c | 27 +++++++++- lib/kernel_lock.c | 120 +++++++++++++++--------------------------------- 4 files changed, 81 insertions(+), 95 deletions(-) Index: linux-2.6.26/arch/mn10300/Kconfig =================================================================== --- linux-2.6.26.orig/arch/mn10300/Kconfig +++ linux-2.6.26/arch/mn10300/Kconfig @@ -186,6 +186,17 @@ config PREEMPT Say Y here if you are building a kernel for a desktop, embedded or real-time system. Say N if you are unsure. +config PREEMPT_BKL + bool "Preempt The Big Kernel Lock" + depends on PREEMPT + default y + help + This option reduces the latency of the kernel by making the + big kernel lock preemptible. + + Say Y here if you are building a kernel for a desktop system. + Say N if you are unsure. + config MN10300_CURRENT_IN_E2 bool "Hold current task address in E2 register" default y Index: linux-2.6.26/include/linux/hardirq.h =================================================================== --- linux-2.6.26.orig/include/linux/hardirq.h +++ linux-2.6.26/include/linux/hardirq.h @@ -72,14 +72,6 @@ #define in_softirq() (softirq_count()) #define in_interrupt() (irq_count()) -#if defined(CONFIG_PREEMPT) -# define PREEMPT_INATOMIC_BASE kernel_locked() -# define PREEMPT_CHECK_OFFSET 1 -#else -# define PREEMPT_INATOMIC_BASE 0 -# define PREEMPT_CHECK_OFFSET 0 -#endif - /* * Are we running in atomic context? WARNING: this macro cannot * always detect atomic context; in particular, it cannot know about @@ -87,11 +79,17 @@ * used in the general case to determine whether sleeping is possible. * Do not use in_atomic() in driver code. */ -#define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_INATOMIC_BASE) +#define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0) + +#ifdef CONFIG_PREEMPT +# define PREEMPT_CHECK_OFFSET 1 +#else +# define PREEMPT_CHECK_OFFSET 0 +#endif /* * Check whether we were atomic before we did preempt_disable(): - * (used by the scheduler, *after* releasing the kernel lock) + * (used by the scheduler) */ #define in_atomic_preempt_off() \ ((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_CHECK_OFFSET) Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -4224,6 +4224,8 @@ EXPORT_SYMBOL(schedule); asmlinkage void __sched preempt_schedule(void) { struct thread_info *ti = current_thread_info(); + struct task_struct *task = current; + int saved_lock_depth; /* * If there is a non-zero preempt_count or interrupts are disabled, @@ -4234,7 +4236,16 @@ asmlinkage void __sched preempt_schedule do { add_preempt_count(PREEMPT_ACTIVE); + + /* + * We keep the big kernel semaphore locked, but we + * clear ->lock_depth so that schedule() doesnt + * auto-release the semaphore: + */ + saved_lock_depth = task->lock_depth; + task->lock_depth = -1; schedule(); + task->lock_depth = saved_lock_depth; sub_preempt_count(PREEMPT_ACTIVE); /* @@ -4255,15 +4266,26 @@ EXPORT_SYMBOL(preempt_schedule); asmlinkage void __sched preempt_schedule_irq(void) { struct thread_info *ti = current_thread_info(); + struct task_struct *task = current; + int saved_lock_depth; /* Catch callers which need to be fixed */ BUG_ON(ti->preempt_count || !irqs_disabled()); do { add_preempt_count(PREEMPT_ACTIVE); + + /* + * We keep the big kernel semaphore locked, but we + * clear ->lock_depth so that schedule() doesnt + * auto-release the semaphore: + */ + saved_lock_depth = task->lock_depth; + task->lock_depth = -1; local_irq_enable(); schedule(); local_irq_disable(); + task->lock_depth = saved_lock_depth; sub_preempt_count(PREEMPT_ACTIVE); /* @@ -5487,11 +5509,8 @@ void __cpuinit init_idle(struct task_str spin_unlock_irqrestore(&rq->lock, flags); /* Set the preempt count _outside_ the spinlocks! */ -#if defined(CONFIG_PREEMPT) - task_thread_info(idle)->preempt_count = (idle->lock_depth >= 0); -#else task_thread_info(idle)->preempt_count = 0; -#endif + /* * The idle tasks have their own, simple scheduling class: */ Index: linux-2.6.26/lib/kernel_lock.c =================================================================== --- linux-2.6.26.orig/lib/kernel_lock.c +++ linux-2.6.26/lib/kernel_lock.c @@ -11,121 +11,79 @@ #include /* - * The 'big kernel lock' + * The 'big kernel semaphore' * - * This spinlock is taken and released recursively by lock_kernel() + * This mutex is taken and released recursively by lock_kernel() * and unlock_kernel(). It is transparently dropped and reacquired * over schedule(). It is used to protect legacy code that hasn't * been migrated to a proper locking design yet. * + * Note: code locked by this semaphore will only be serialized against + * other code using the same locking facility. The code guarantees that + * the task remains on the same CPU. + * * Don't use in new code. */ -static __cacheline_aligned_in_smp DEFINE_SPINLOCK(kernel_flag); - +static DECLARE_MUTEX(kernel_sem); /* - * Acquire/release the underlying lock from the scheduler. + * Re-acquire the kernel semaphore. * - * This is called with preemption disabled, and should - * return an error value if it cannot get the lock and - * TIF_NEED_RESCHED gets set. + * This function is called with preemption off. * - * If it successfully gets the lock, it should increment - * the preemption count like any spinlock does. - * - * (This works on UP too - _raw_spin_trylock will never - * return false in that case) + * We are executing in schedule() so the code must be extremely careful + * about recursion, both due to the down() and due to the enabling of + * preemption. schedule() will re-check the preemption flag after + * reacquiring the semaphore. */ int __lockfunc __reacquire_kernel_lock(void) { - while (!_raw_spin_trylock(&kernel_flag)) { - if (test_thread_flag(TIF_NEED_RESCHED)) - return -EAGAIN; - cpu_relax(); - } + struct task_struct *task = current; + int saved_lock_depth = task->lock_depth; + + BUG_ON(saved_lock_depth < 0); + + task->lock_depth = -1; + preempt_enable_no_resched(); + + down(&kernel_sem); + preempt_disable(); + task->lock_depth = saved_lock_depth; + return 0; } void __lockfunc __release_kernel_lock(void) { - _raw_spin_unlock(&kernel_flag); - preempt_enable_no_resched(); + up(&kernel_sem); } /* - * These are the BKL spinlocks - we try to be polite about preemption. - * If SMP is not on (ie UP preemption), this all goes away because the - * _raw_spin_trylock() will always succeed. + * Getting the big kernel semaphore. */ -#ifdef CONFIG_PREEMPT -static inline void __lock_kernel(void) +void __lockfunc lock_kernel(void) { - preempt_disable(); - if (unlikely(!_raw_spin_trylock(&kernel_flag))) { - /* - * If preemption was disabled even before this - * was called, there's nothing we can be polite - * about - just spin. - */ - if (preempt_count() > 1) { - _raw_spin_lock(&kernel_flag); - return; - } + struct task_struct *task = current; + int depth = task->lock_depth + 1; + if (likely(!depth)) /* - * Otherwise, let's wait for the kernel lock - * with preemption enabled.. + * No recursion worries - we set up lock_depth _after_ */ - do { - preempt_enable(); - while (spin_is_locked(&kernel_flag)) - cpu_relax(); - preempt_disable(); - } while (!_raw_spin_trylock(&kernel_flag)); - } -} + down(&kernel_sem); -#else - -/* - * Non-preemption case - just get the spinlock - */ -static inline void __lock_kernel(void) -{ - _raw_spin_lock(&kernel_flag); + task->lock_depth = depth; } -#endif -static inline void __unlock_kernel(void) +void __lockfunc unlock_kernel(void) { - /* - * the BKL is not covered by lockdep, so we open-code the - * unlocking sequence (and thus avoid the dep-chain ops): - */ - _raw_spin_unlock(&kernel_flag); - preempt_enable(); -} + struct task_struct *task = current; -/* - * Getting the big kernel lock. - * - * This cannot happen asynchronously, so we only need to - * worry about other CPU's. - */ -void __lockfunc lock_kernel(void) -{ - int depth = current->lock_depth+1; - if (likely(!depth)) - __lock_kernel(); - current->lock_depth = depth; -} + BUG_ON(task->lock_depth < 0); -void __lockfunc unlock_kernel(void) -{ - BUG_ON(current->lock_depth < 0); - if (likely(--current->lock_depth < 0)) - __unlock_kernel(); + if (likely(--task->lock_depth < 0)) + up(&kernel_sem); } EXPORT_SYMBOL(lock_kernel); patches/rcu-trace-fix-free.patch0000664000076400007640000000133211043564064015650 0ustar tglxtglx--- kernel/rcupreempt_trace.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) Index: linux-2.6.26/kernel/rcupreempt_trace.c =================================================================== --- linux-2.6.26.orig/kernel/rcupreempt_trace.c +++ linux-2.6.26/kernel/rcupreempt_trace.c @@ -309,11 +309,16 @@ out: static int __init rcupreempt_trace_init(void) { + int ret; + mutex_init(&rcupreempt_trace_mutex); rcupreempt_trace_buf = kmalloc(RCUPREEMPT_TRACE_BUF_SIZE, GFP_KERNEL); if (!rcupreempt_trace_buf) return 1; - return rcupreempt_debugfs_init(); + ret = rcupreempt_debugfs_init(); + if (ret) + kfree(rcupreempt_trace_buf); + return ret; } static void __exit rcupreempt_trace_cleanup(void) patches/rcu-preempt-fix-bad-dyntick-accounting.patch0000664000076400007640000000251511043564064021632 0ustar tglxtglx--- include/linux/rcupreempt.h | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) Index: linux-2.6.26/include/linux/rcupreempt.h =================================================================== --- linux-2.6.26.orig/include/linux/rcupreempt.h +++ linux-2.6.26/include/linux/rcupreempt.h @@ -87,14 +87,26 @@ static inline void rcu_enter_nohz(void) { smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */ __get_cpu_var(dynticks_progress_counter)++; - WARN_ON(__get_cpu_var(dynticks_progress_counter) & 0x1); + if (unlikely(__get_cpu_var(dynticks_progress_counter) & 0x1)) { + printk("BUG: bad accounting of dynamic ticks\n"); + printk(" will try to fix, but it is best to reboot\n"); + WARN_ON(1); + /* try to fix it */ + __get_cpu_var(dynticks_progress_counter)++; + } } static inline void rcu_exit_nohz(void) { __get_cpu_var(dynticks_progress_counter)++; smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */ - WARN_ON(!(__get_cpu_var(dynticks_progress_counter) & 0x1)); + if (unlikely(!(__get_cpu_var(dynticks_progress_counter) & 0x1))) { + printk("BUG: bad accounting of dynamic ticks\n"); + printk(" will try to fix, but it is best to reboot\n"); + WARN_ON(1); + /* try to fix it */ + __get_cpu_var(dynticks_progress_counter)++; + } } #else /* CONFIG_NO_HZ */ patches/rcu-preempt-boost-sdr.patch0000664000076400007640000006432611043564064016451 0ustar tglxtglx--- include/linux/init_task.h | 13 + include/linux/rcupdate.h | 44 +++ include/linux/rcupreempt.h | 20 + include/linux/sched.h | 22 + kernel/Kconfig.preempt | 13 + kernel/Makefile | 1 kernel/fork.c | 8 kernel/rcupdate.c | 3 kernel/rcupreempt-boost.c | 549 +++++++++++++++++++++++++++++++++++++++++++++ kernel/rcupreempt.c | 2 kernel/rcupreempt_trace.c | 7 kernel/rtmutex.c | 7 kernel/sched.c | 2 13 files changed, 687 insertions(+), 4 deletions(-) Index: linux-2.6.26/include/linux/init_task.h =================================================================== --- linux-2.6.26.orig/include/linux/init_task.h +++ linux-2.6.26/include/linux/init_task.h @@ -67,6 +67,17 @@ extern struct nsproxy init_nsproxy; .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(sighand.signalfd_wqh), \ } +#ifdef CONFIG_PREEMPT_RCU_BOOST +#define INIT_RCU_BOOST_PRIO .rcu_prio = MAX_PRIO, +#define INIT_PREEMPT_RCU_BOOST(tsk) \ + .rcub_rbdp = NULL, \ + .rcub_state = RCU_BOOST_IDLE, \ + .rcub_entry = LIST_HEAD_INIT(tsk.rcub_entry), +#else /* #ifdef CONFIG_PREEMPT_RCU_BOOST */ +#define INIT_RCU_BOOST_PRIO +#define INIT_PREEMPT_RCU_BOOST(tsk) +#endif /* #else #ifdef CONFIG_PREEMPT_RCU_BOOST */ + extern struct group_info init_groups; #define INIT_STRUCT_PID { \ @@ -128,6 +139,7 @@ extern struct group_info init_groups; .static_prio = MAX_PRIO-20, \ .normal_prio = MAX_PRIO-20, \ .policy = SCHED_NORMAL, \ + INIT_RCU_BOOST_PRIO \ .cpus_allowed = CPU_MASK_ALL, \ .mm = NULL, \ .active_mm = &init_mm, \ @@ -179,6 +191,7 @@ extern struct group_info init_groups; INIT_IDS \ INIT_TRACE_IRQFLAGS \ INIT_LOCKDEP \ + INIT_PREEMPT_RCU_BOOST(tsk) \ } Index: linux-2.6.26/include/linux/rcupdate.h =================================================================== --- linux-2.6.26.orig/include/linux/rcupdate.h +++ linux-2.6.26/include/linux/rcupdate.h @@ -231,4 +231,48 @@ extern long rcu_batches_completed_bh(voi extern void rcu_init(void); extern int rcu_needs_cpu(int cpu); +struct dentry; + +#ifdef CONFIG_PREEMPT_RCU_BOOST +extern void init_rcu_boost_late(void); +extern void rcu_boost_readers(void); +extern void rcu_unboost_readers(void); +extern void __rcu_preempt_boost(void); +#ifdef CONFIG_RCU_TRACE +extern int rcu_trace_boost_create(struct dentry *rcudir); +extern void rcu_trace_boost_destroy(void); +#endif /* CONFIG_RCU_TRACE */ +#define rcu_preempt_boost() /* cpp to avoid #include hell. */ \ + do { \ + if (unlikely(current->rcu_read_lock_nesting > 0)) \ + __rcu_preempt_boost(); \ + } while (0) +extern void __rcu_preempt_unboost(void); +#else /* #ifdef CONFIG_PREEMPT_RCU_BOOST */ +static inline void init_rcu_boost_late(void) +{ +} +static inline void rcu_preempt_boost(void) +{ +} +static inline void __rcu_preempt_unboost(void) +{ +} +static inline void rcu_boost_readers(void) +{ +} +static inline void rcu_unboost_readers(void) +{ +} +#ifdef CONFIG_RCU_TRACE +static inline int rcu_trace_boost_create(struct dentry *rcudir) +{ + return 0; +} +static inline void rcu_trace_boost_destroy(void) +{ +} +#endif /* CONFIG_RCU_TRACE */ +#endif /* #else #ifdef CONFIG_PREEMPT_RCU_BOOST */ + #endif /* __LINUX_RCUPDATE_H */ Index: linux-2.6.26/include/linux/rcupreempt.h =================================================================== --- linux-2.6.26.orig/include/linux/rcupreempt.h +++ linux-2.6.26/include/linux/rcupreempt.h @@ -44,6 +44,26 @@ #define rcu_bh_qsctr_inc(cpu) #define call_rcu_bh(head, rcu) call_rcu(head, rcu) +#ifdef CONFIG_PREEMPT_RCU_BOOST +/* + * Task state with respect to being RCU-boosted. This state is changed + * by the task itself in response to the following three events: + * 1. Preemption (or block on lock) while in RCU read-side critical section. + * 2. Outermost rcu_read_unlock() for blocked RCU read-side critical section. + * + * The RCU-boost task also updates the state when boosting priority. + */ +enum rcu_boost_state { + RCU_BOOST_IDLE = 0, /* Not yet blocked if in RCU read-side. */ + RCU_BOOST_BLOCKED = 1, /* Blocked from RCU read-side. */ + RCU_BOOSTED = 2, /* Boosting complete. */ + RCU_BOOST_INVALID = 3, /* For bogus state sightings. */ +}; + +#define N_RCU_BOOST_STATE (RCU_BOOST_INVALID + 1) + +#endif /* #ifdef CONFIG_PREEMPT_RCU_BOOST */ + extern void __rcu_read_lock(void) __acquires(RCU); extern void __rcu_read_unlock(void) __releases(RCU); extern int rcu_pending(int cpu); Index: linux-2.6.26/include/linux/sched.h =================================================================== --- linux-2.6.26.orig/include/linux/sched.h +++ linux-2.6.26/include/linux/sched.h @@ -565,6 +565,19 @@ struct signal_struct { #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ +#ifdef CONFIG_PREEMPT_RCU_BOOST +#define set_rcu_prio(p, prio) /* cpp to avoid #include hell */ \ + do { \ + (p)->rcu_prio = (prio); \ + } while (0) +#define get_rcu_prio(p) (p)->rcu_prio /* cpp to avoid #include hell */ +#else /* #ifdef CONFIG_PREEMPT_RCU_BOOST */ +static inline void set_rcu_prio(struct task_struct *p, int prio) +{ +} +#define get_rcu_prio(p) (MAX_PRIO) /* cpp to use MAX_PRIO before it's defined */ +#endif /* #else #ifdef CONFIG_PREEMPT_RCU_BOOST */ + /* If true, all threads except ->group_exit_task have pending SIGKILL */ static inline int signal_group_exit(const struct signal_struct *sig) { @@ -1039,6 +1052,9 @@ struct task_struct { #endif int prio, static_prio, normal_prio; +#ifdef CONFIG_PREEMPT_RCU_BOOST + int rcu_prio; +#endif const struct sched_class *sched_class; struct sched_entity se; struct sched_rt_entity rt; @@ -1073,6 +1089,12 @@ struct task_struct { #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) struct sched_info sched_info; #endif +#ifdef CONFIG_PREEMPT_RCU_BOOST + struct rcu_boost_dat *rcub_rbdp; + enum rcu_boost_state rcub_state; + struct list_head rcub_entry; + unsigned long rcu_preempt_counter; +#endif struct list_head tasks; /* Index: linux-2.6.26/kernel/Kconfig.preempt =================================================================== --- linux-2.6.26.orig/kernel/Kconfig.preempt +++ linux-2.6.26/kernel/Kconfig.preempt @@ -66,6 +66,19 @@ config PREEMPT_RCU Say N if you are unsure. +config PREEMPT_RCU_BOOST + bool "Enable priority boosting of RCU read-side critical sections" + depends on PREEMPT_RCU + help + This option permits priority boosting of RCU read-side critical + sections tat have been preempted and a RT process is waiting + on a synchronize_rcu. + + An RCU thread is also created that periodically wakes up and + performs a synchronize_rcu to make sure that all readers eventually + do complete to prevent an indefinite delay of grace periods and + possible OOM problems. + config RCU_TRACE bool "Enable tracing for RCU - currently stats in debugfs" depends on PREEMPT_RCU Index: linux-2.6.26/kernel/Makefile =================================================================== --- linux-2.6.26.orig/kernel/Makefile +++ linux-2.6.26/kernel/Makefile @@ -60,6 +60,7 @@ obj-$(CONFIG_SECCOMP) += seccomp.o obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o obj-$(CONFIG_CLASSIC_RCU) += rcuclassic.o obj-$(CONFIG_PREEMPT_RCU) += rcupreempt.o +obj-$(CONFIG_PREEMPT_RCU_BOOST) += rcupreempt-boost.o ifeq ($(CONFIG_PREEMPT_RCU),y) obj-$(CONFIG_RCU_TRACE) += rcupreempt_trace.o endif Index: linux-2.6.26/kernel/fork.c =================================================================== --- linux-2.6.26.orig/kernel/fork.c +++ linux-2.6.26/kernel/fork.c @@ -947,7 +947,13 @@ static struct task_struct *copy_process( #ifdef CONFIG_PREEMPT_RCU p->rcu_read_lock_nesting = 0; p->rcu_flipctr_idx = 0; -#endif /* #ifdef CONFIG_PREEMPT_RCU */ +#ifdef CONFIG_PREEMPT_RCU_BOOST + p->rcu_prio = MAX_PRIO; + p->rcub_rbdp = NULL; + p->rcub_state = RCU_BOOST_IDLE; + INIT_LIST_HEAD(&p->rcub_entry); +#endif +#endif /* CONFIG_PREEMPT_RCU */ p->vfork_done = NULL; spin_lock_init(&p->alloc_lock); Index: linux-2.6.26/kernel/rcupdate.c =================================================================== --- linux-2.6.26.orig/kernel/rcupdate.c +++ linux-2.6.26/kernel/rcupdate.c @@ -85,8 +85,11 @@ void synchronize_rcu(void) /* Will wake me after RCU finished */ call_rcu(&rcu.head, wakeme_after_rcu); + rcu_boost_readers(); + /* Wait for it */ wait_for_completion(&rcu.completion); + rcu_unboost_readers(); } EXPORT_SYMBOL_GPL(synchronize_rcu); Index: linux-2.6.26/kernel/rcupreempt-boost.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/rcupreempt-boost.c @@ -0,0 +1,549 @@ +/* + * Read-Copy Update preempt priority boosting + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Copyright Red Hat Inc, 2007 + * + * Authors: Steven Rostedt + * + * Based on the original work by Paul McKenney . + * + */ +#include +#include +#include +#include +#include +#include +#include + +DEFINE_SPINLOCK(rcu_boost_wake_lock); +static int rcu_boost_prio = MAX_PRIO; /* Prio to set preempted RCU readers */ +static long rcu_boost_counter; /* used to keep track of who boosted */ +static int rcu_preempt_thread_secs = 3; /* Seconds between waking rcupreemptd thread */ + +struct rcu_boost_dat { + spinlock_t rbs_lock; /* Sync changes to this struct */ + int rbs_prio; /* CPU copy of rcu_boost_prio */ + struct list_head rbs_toboost; /* Preempted RCU readers */ + struct list_head rbs_boosted; /* RCU readers that have been boosted */ +#ifdef CONFIG_RCU_TRACE + /* The rest are for statistics */ + unsigned long rbs_stat_task_boost_called; + unsigned long rbs_stat_task_boosted; + unsigned long rbs_stat_boost_called; + unsigned long rbs_stat_try_boost; + unsigned long rbs_stat_boosted; + unsigned long rbs_stat_unboost_called; + unsigned long rbs_stat_unboosted; + unsigned long rbs_stat_try_boost_readers; + unsigned long rbs_stat_boost_readers; + unsigned long rbs_stat_try_unboost_readers; + unsigned long rbs_stat_unboost_readers; + unsigned long rbs_stat_over_taken; +#endif /* CONFIG_RCU_TRACE */ +}; + +static DEFINE_PER_CPU(struct rcu_boost_dat, rcu_boost_data); +#define RCU_BOOST_ME &__get_cpu_var(rcu_boost_data) + +#ifdef CONFIG_RCU_TRACE + +#define RCUPREEMPT_BOOST_TRACE_BUF_SIZE 4096 +static char rcupreempt_boost_trace_buf[RCUPREEMPT_BOOST_TRACE_BUF_SIZE]; + +static ssize_t rcuboost_read(struct file *filp, char __user *buffer, + size_t count, loff_t *ppos) +{ + static DEFINE_MUTEX(mutex); + int cnt = 0; + int cpu; + struct rcu_boost_dat *rbd; + ssize_t bcount; + unsigned long task_boost_called = 0; + unsigned long task_boosted = 0; + unsigned long boost_called = 0; + unsigned long try_boost = 0; + unsigned long boosted = 0; + unsigned long unboost_called = 0; + unsigned long unboosted = 0; + unsigned long try_boost_readers = 0; + unsigned long boost_readers = 0; + unsigned long try_unboost_readers = 0; + unsigned long unboost_readers = 0; + unsigned long over_taken = 0; + + mutex_lock(&mutex); + + for_each_online_cpu(cpu) { + rbd = &per_cpu(rcu_boost_data, cpu); + + task_boost_called += rbd->rbs_stat_task_boost_called; + task_boosted += rbd->rbs_stat_task_boosted; + boost_called += rbd->rbs_stat_boost_called; + try_boost += rbd->rbs_stat_try_boost; + boosted += rbd->rbs_stat_boosted; + unboost_called += rbd->rbs_stat_unboost_called; + unboosted += rbd->rbs_stat_unboosted; + try_boost_readers += rbd->rbs_stat_try_boost_readers; + boost_readers += rbd->rbs_stat_boost_readers; + try_unboost_readers += rbd->rbs_stat_try_boost_readers; + unboost_readers += rbd->rbs_stat_boost_readers; + over_taken += rbd->rbs_stat_over_taken; + } + + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "task_boost_called = %ld\n", + task_boost_called); + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "task_boosted = %ld\n", + task_boosted); + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "boost_called = %ld\n", + boost_called); + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "try_boost = %ld\n", + try_boost); + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "boosted = %ld\n", + boosted); + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "unboost_called = %ld\n", + unboost_called); + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "unboosted = %ld\n", + unboosted); + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "try_boost_readers = %ld\n", + try_boost_readers); + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "boost_readers = %ld\n", + boost_readers); + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "try_unboost_readers = %ld\n", + try_unboost_readers); + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "unboost_readers = %ld\n", + unboost_readers); + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "over_taken = %ld\n", + over_taken); + cnt += snprintf(&rcupreempt_boost_trace_buf[cnt], + RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt, + "rcu_boost_prio = %d\n", + rcu_boost_prio); + bcount = simple_read_from_buffer(buffer, count, ppos, + rcupreempt_boost_trace_buf, strlen(rcupreempt_boost_trace_buf)); + mutex_unlock(&mutex); + + return bcount; +} + +static struct file_operations rcuboost_fops = { + .read = rcuboost_read, +}; + +static struct dentry *rcuboostdir; +int rcu_trace_boost_create(struct dentry *rcudir) +{ + rcuboostdir = debugfs_create_file("rcuboost", 0444, rcudir, + NULL, &rcuboost_fops); + if (!rcuboostdir) + return 1; + + return 0; +} +EXPORT_SYMBOL_GPL(rcu_trace_boost_create); + +void rcu_trace_boost_destroy(void) +{ + if (rcuboostdir) + debugfs_remove(rcuboostdir); + rcuboostdir = NULL; +} +EXPORT_SYMBOL_GPL(rcu_trace_boost_destroy); + +#define RCU_BOOST_TRACE_FUNC_DECL(type) \ + static void rcu_trace_boost_##type(struct rcu_boost_dat *rbd) \ + { \ + rbd->rbs_stat_##type++; \ + } +RCU_BOOST_TRACE_FUNC_DECL(task_boost_called) +RCU_BOOST_TRACE_FUNC_DECL(task_boosted) +RCU_BOOST_TRACE_FUNC_DECL(boost_called) +RCU_BOOST_TRACE_FUNC_DECL(try_boost) +RCU_BOOST_TRACE_FUNC_DECL(boosted) +RCU_BOOST_TRACE_FUNC_DECL(unboost_called) +RCU_BOOST_TRACE_FUNC_DECL(unboosted) +RCU_BOOST_TRACE_FUNC_DECL(try_boost_readers) +RCU_BOOST_TRACE_FUNC_DECL(boost_readers) +RCU_BOOST_TRACE_FUNC_DECL(try_unboost_readers) +RCU_BOOST_TRACE_FUNC_DECL(unboost_readers) +RCU_BOOST_TRACE_FUNC_DECL(over_taken) +#else /* CONFIG_RCU_TRACE */ +/* These were created by the above macro "RCU_BOOST_TRACE_FUNC_DECL" */ +# define rcu_trace_boost_task_boost_called(rbd) do { } while (0) +# define rcu_trace_boost_task_boosted(rbd) do { } while (0) +# define rcu_trace_boost_boost_called(rbd) do { } while (0) +# define rcu_trace_boost_try_boost(rbd) do { } while (0) +# define rcu_trace_boost_boosted(rbd) do { } while (0) +# define rcu_trace_boost_unboost_called(rbd) do { } while (0) +# define rcu_trace_boost_unboosted(rbd) do { } while (0) +# define rcu_trace_boost_try_boost_readers(rbd) do { } while (0) +# define rcu_trace_boost_boost_readers(rbd) do { } while (0) +# define rcu_trace_boost_try_unboost_readers(rbd) do { } while (0) +# define rcu_trace_boost_unboost_readers(rbd) do { } while (0) +# define rcu_trace_boost_over_taken(rbd) do { } while (0) +#endif /* CONFIG_RCU_TRACE */ + +/* + * Helper function to boost a task's prio. + */ +static void rcu_boost_task(struct task_struct *task) +{ + WARN_ON(!irqs_disabled()); + WARN_ON_SMP(!spin_is_locked(&task->pi_lock)); + + rcu_trace_boost_task_boost_called(RCU_BOOST_ME); + + if (task->rcu_prio < task->prio) { + rcu_trace_boost_task_boosted(RCU_BOOST_ME); + rt_mutex_setprio(task, task->rcu_prio); + } +} + +/** + * __rcu_preepmt_boost - Called by sleeping RCU readers. + * + * When the RCU read-side critical section is preempted + * (or schedules out due to RT mutex) + * it places itself onto a list to notify that it is sleeping + * while holding a RCU read lock. If there is already a + * synchronize_rcu happening, then it will increase its + * priority (if necessary). + */ +void __rcu_preempt_boost(void) +{ + struct task_struct *curr = current; + struct rcu_boost_dat *rbd; + int prio; + unsigned long flags; + + WARN_ON(!current->rcu_read_lock_nesting); + + rcu_trace_boost_boost_called(RCU_BOOST_ME); + + /* check to see if we are already boosted */ + if (unlikely(curr->rcub_rbdp)) + return; + + /* + * To keep us from preempting between grabing + * the rbd and locking it, we use local_irq_save + */ + local_irq_save(flags); + rbd = &__get_cpu_var(rcu_boost_data); + spin_lock(&rbd->rbs_lock); + + spin_lock(&curr->pi_lock); + + curr->rcub_rbdp = rbd; + + rcu_trace_boost_try_boost(rbd); + + prio = rt_mutex_getprio(curr); + + if (list_empty(&curr->rcub_entry)) + list_add_tail(&curr->rcub_entry, &rbd->rbs_toboost); + if (prio <= rbd->rbs_prio) + goto out; + + rcu_trace_boost_boosted(curr->rcub_rbdp); + + set_rcu_prio(curr, rbd->rbs_prio); + rcu_boost_task(curr); + + out: + spin_unlock(&curr->pi_lock); + spin_unlock_irqrestore(&rbd->rbs_lock, flags); +} + +/** + * __rcu_preempt_unboost - called when releasing the RCU read lock + * + * When releasing the RCU read lock, a check is made to see if + * the task was preempted. If it was, it removes itself from the + * RCU data lists and if necessary, sets its priority back to + * normal. + */ +void __rcu_preempt_unboost(void) +{ + struct task_struct *curr = current; + struct rcu_boost_dat *rbd; + int prio; + unsigned long flags; + + rcu_trace_boost_unboost_called(RCU_BOOST_ME); + + /* if not boosted, then ignore */ + if (likely(!curr->rcub_rbdp)) + return; + + rbd = curr->rcub_rbdp; + + spin_lock_irqsave(&rbd->rbs_lock, flags); + list_del_init(&curr->rcub_entry); + + rcu_trace_boost_unboosted(curr->rcub_rbdp); + + set_rcu_prio(curr, MAX_PRIO); + + spin_lock(&curr->pi_lock); + prio = rt_mutex_getprio(curr); + rt_mutex_setprio(curr, prio); + + curr->rcub_rbdp = NULL; + + spin_unlock(&curr->pi_lock); + spin_unlock_irqrestore(&rbd->rbs_lock, flags); +} + +/* + * For each rcu_boost_dat structure, update all the tasks that + * are on the lists to the priority of the caller of + * synchronize_rcu. + */ +static int __rcu_boost_readers(struct rcu_boost_dat *rbd, int prio, unsigned long flags) +{ + struct task_struct *curr = current; + struct task_struct *p; + + spin_lock(&rbd->rbs_lock); + + rbd->rbs_prio = prio; + + /* + * Move the already boosted readers onto the list and reboost + * them. + */ + list_splice_init(&rbd->rbs_boosted, + &rbd->rbs_toboost); + + while (!list_empty(&rbd->rbs_toboost)) { + p = list_entry(rbd->rbs_toboost.next, + struct task_struct, rcub_entry); + list_move_tail(&p->rcub_entry, + &rbd->rbs_boosted); + set_rcu_prio(p, prio); + spin_lock(&p->pi_lock); + rcu_boost_task(p); + spin_unlock(&p->pi_lock); + + /* + * Now we release the lock to allow for a higher + * priority task to come in and boost the readers + * even higher. Or simply to let a higher priority + * task to run now. + */ + spin_unlock(&rbd->rbs_lock); + spin_unlock_irqrestore(&rcu_boost_wake_lock, flags); + + cpu_relax(); + spin_lock_irqsave(&rcu_boost_wake_lock, flags); + /* + * Another task may have taken over. + */ + if (curr->rcu_preempt_counter != rcu_boost_counter) { + rcu_trace_boost_over_taken(rbd); + return 1; + } + + spin_lock(&rbd->rbs_lock); + } + + spin_unlock(&rbd->rbs_lock); + + return 0; +} + +/** + * rcu_boost_readers - called by synchronize_rcu to boost sleeping RCU readers. + * + * This function iterates over all the per_cpu rcu_boost_data descriptors + * and boosts any sleeping (or slept) RCU readers. + */ +void rcu_boost_readers(void) +{ + struct task_struct *curr = current; + struct rcu_boost_dat *rbd; + unsigned long flags; + int prio; + int cpu; + int ret; + + spin_lock_irqsave(&rcu_boost_wake_lock, flags); + + prio = rt_mutex_getprio(curr); + + rcu_trace_boost_try_boost_readers(RCU_BOOST_ME); + + if (prio >= rcu_boost_prio) { + /* already boosted */ + spin_unlock_irqrestore(&rcu_boost_wake_lock, flags); + return; + } + + rcu_boost_prio = prio; + + rcu_trace_boost_boost_readers(RCU_BOOST_ME); + + /* Flag that we are the one to unboost */ + curr->rcu_preempt_counter = ++rcu_boost_counter; + + for_each_online_cpu(cpu) { + rbd = &per_cpu(rcu_boost_data, cpu); + ret = __rcu_boost_readers(rbd, prio, flags); + if (ret) + break; + } + + spin_unlock_irqrestore(&rcu_boost_wake_lock, flags); + +} + +/** + * rcu_unboost_readers - set the boost level back to normal. + * + * This function DOES NOT change the priority of any RCU reader + * that was boosted. The RCU readers do that when they release + * the RCU lock. This function only sets the global + * rcu_boost_prio to MAX_PRIO so that new RCU readers that sleep + * do not increase their priority. + */ +void rcu_unboost_readers(void) +{ + struct rcu_boost_dat *rbd; + unsigned long flags; + int cpu; + + spin_lock_irqsave(&rcu_boost_wake_lock, flags); + + rcu_trace_boost_try_unboost_readers(RCU_BOOST_ME); + + if (current->rcu_preempt_counter != rcu_boost_counter) + goto out; + + rcu_trace_boost_unboost_readers(RCU_BOOST_ME); + + /* + * We could also put in something that + * would allow other synchronize_rcu callers + * of lower priority that are still waiting + * to boost the prio. + */ + rcu_boost_prio = MAX_PRIO; + + for_each_online_cpu(cpu) { + rbd = &per_cpu(rcu_boost_data, cpu); + + spin_lock(&rbd->rbs_lock); + rbd->rbs_prio = rcu_boost_prio; + spin_unlock(&rbd->rbs_lock); + } + + out: + spin_unlock_irqrestore(&rcu_boost_wake_lock, flags); +} + +/* + * The krcupreemptd wakes up every "rcu_preempt_thread_secs" + * seconds at the minimum priority of 1 to do a + * synchronize_rcu. This ensures that grace periods finish + * and that we do not starve the system. If there are RT + * tasks above priority 1 that are hogging the system and + * preventing release of memory, then its the fault of the + * system designer running RT tasks too aggressively and the + * system is flawed regardless. + */ +static int krcupreemptd(void *data) +{ + struct sched_param param = { .sched_priority = 1 }; + int ret; + int prio; + + ret = sched_setscheduler(current, SCHED_FIFO, ¶m); + printk("krcupreemptd setsched %d\n", ret); + prio = current->prio; + printk(" prio = %d\n", prio); + set_current_state(TASK_INTERRUPTIBLE); + + while (!kthread_should_stop()) { + schedule_timeout(rcu_preempt_thread_secs * HZ); + + __set_current_state(TASK_RUNNING); + if (prio != current->prio) { + prio = current->prio; + printk("krcupreemptd new prio is %d??\n",prio); + } + + synchronize_rcu(); + + set_current_state(TASK_INTERRUPTIBLE); + } + __set_current_state(TASK_RUNNING); + return 0; +} + +static int __init rcu_preempt_boost_init(void) +{ + struct rcu_boost_dat *rbd; + struct task_struct *p; + int cpu; + + for_each_possible_cpu(cpu) { + rbd = &per_cpu(rcu_boost_data, cpu); + + spin_lock_init(&rbd->rbs_lock); + rbd->rbs_prio = MAX_PRIO; + INIT_LIST_HEAD(&rbd->rbs_toboost); + INIT_LIST_HEAD(&rbd->rbs_boosted); + } + + p = kthread_create(krcupreemptd, NULL, + "krcupreemptd"); + + if (IS_ERR(p)) { + printk("krcupreemptd failed\n"); + return NOTIFY_BAD; + } + wake_up_process(p); + + return 0; +} + +core_initcall(rcu_preempt_boost_init); Index: linux-2.6.26/kernel/rcupreempt.c =================================================================== --- linux-2.6.26.orig/kernel/rcupreempt.c +++ linux-2.6.26/kernel/rcupreempt.c @@ -349,6 +349,8 @@ void __rcu_read_unlock(void) ACCESS_ONCE(RCU_DATA_ME()->rcu_flipctr[idx])--; local_irq_restore(flags); + + __rcu_preempt_unboost(); } } EXPORT_SYMBOL_GPL(__rcu_read_unlock); Index: linux-2.6.26/kernel/rcupreempt_trace.c =================================================================== --- linux-2.6.26.orig/kernel/rcupreempt_trace.c +++ linux-2.6.26/kernel/rcupreempt_trace.c @@ -296,8 +296,14 @@ static int rcupreempt_debugfs_init(void) NULL, &rcuctrs_fops); if (!ctrsdir) goto free_out; + + if (!rcu_trace_boost_create(rcudir)) + goto free_out; + return 0; free_out: + if (ctrsdir) + debugfs_remove(ctrsdir); if (statdir) debugfs_remove(statdir); if (gpdir) @@ -323,6 +329,7 @@ static int __init rcupreempt_trace_init( static void __exit rcupreempt_trace_cleanup(void) { + rcu_trace_boost_destroy(); debugfs_remove(statdir); debugfs_remove(gpdir); debugfs_remove(ctrsdir); Index: linux-2.6.26/kernel/rtmutex.c =================================================================== --- linux-2.6.26.orig/kernel/rtmutex.c +++ linux-2.6.26/kernel/rtmutex.c @@ -105,11 +105,12 @@ static inline void mark_rt_mutex_waiters */ int rt_mutex_getprio(struct task_struct *task) { + int prio = min(task->normal_prio, get_rcu_prio(task)); + if (likely(!task_has_pi_waiters(task))) - return task->normal_prio; + return prio; - return min(task_top_pi_waiter(task)->pi_list_entry.prio, - task->normal_prio); + return min(task_top_pi_waiter(task)->pi_list_entry.prio, prio); } /* Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -4145,6 +4145,8 @@ asmlinkage void __sched schedule(void) struct rq *rq; int cpu; + rcu_preempt_boost(); + need_resched: preempt_disable(); cpu = smp_processor_id(); patches/rcu-preempt-boost-default.patch0000664000076400007640000000111511043564064017270 0ustar tglxtglx--- kernel/Kconfig.preempt | 1 + 1 file changed, 1 insertion(+) Index: linux-2.6.26/kernel/Kconfig.preempt =================================================================== --- linux-2.6.26.orig/kernel/Kconfig.preempt +++ linux-2.6.26/kernel/Kconfig.preempt @@ -69,6 +69,7 @@ config PREEMPT_RCU config PREEMPT_RCU_BOOST bool "Enable priority boosting of RCU read-side critical sections" depends on PREEMPT_RCU + default y if PREEMPT_RT help This option permits priority boosting of RCU read-side critical sections tat have been preempted and a RT process is waiting patches/rcu-preempt-boost-fix.patch0000664000076400007640000000440011043564064016432 0ustar tglxtglx--- kernel/rcupreempt-boost.c | 39 ++++++++++++++++++++++++++++++++++++--- 1 file changed, 36 insertions(+), 3 deletions(-) Index: linux-2.6.26/kernel/rcupreempt-boost.c =================================================================== --- linux-2.6.26.orig/kernel/rcupreempt-boost.c +++ linux-2.6.26/kernel/rcupreempt-boost.c @@ -221,6 +221,11 @@ RCU_BOOST_TRACE_FUNC_DECL(over_taken) # define rcu_trace_boost_over_taken(rbd) do { } while (0) #endif /* CONFIG_RCU_TRACE */ +static inline int rcu_is_boosted(struct task_struct *task) +{ + return !list_empty(&task->rcub_entry); +} + /* * Helper function to boost a task's prio. */ @@ -259,7 +264,7 @@ void __rcu_preempt_boost(void) rcu_trace_boost_boost_called(RCU_BOOST_ME); /* check to see if we are already boosted */ - if (unlikely(curr->rcub_rbdp)) + if (unlikely(rcu_is_boosted(curr))) return; /* @@ -311,15 +316,42 @@ void __rcu_preempt_unboost(void) rcu_trace_boost_unboost_called(RCU_BOOST_ME); /* if not boosted, then ignore */ - if (likely(!curr->rcub_rbdp)) + if (likely(!rcu_is_boosted(curr))) return; + /* + * Need to be very careful with NMIs. + * If we take the lock and an NMI comes in + * and it may try to unboost us if curr->rcub_rbdp + * is still set. So we zero it before grabbing the lock. + * But this also means that we might be boosted again + * so the boosting code needs to be aware of this. + */ rbd = curr->rcub_rbdp; + curr->rcub_rbdp = NULL; + + /* + * Now an NMI might have came in after we grab + * the below lock. This check makes sure that + * the NMI doesn't try grabbing the lock + * while we already have it. + */ + if (unlikely(!rbd)) + return; spin_lock_irqsave(&rbd->rbs_lock, flags); + /* + * It is still possible that an NMI came in + * between the "is_boosted" check and setting + * the rcu_rbdp to NULL. This would mean that + * the NMI already dequeued us. + */ + if (unlikely(!rcu_is_boosted(curr))) + goto out; + list_del_init(&curr->rcub_entry); - rcu_trace_boost_unboosted(curr->rcub_rbdp); + rcu_trace_boost_unboosted(rbd); set_rcu_prio(curr, MAX_PRIO); @@ -330,6 +362,7 @@ void __rcu_preempt_unboost(void) curr->rcub_rbdp = NULL; spin_unlock(&curr->pi_lock); + out: spin_unlock_irqrestore(&rbd->rbs_lock, flags); } patches/rcu-hrt-fixups.patch0000664000076400007640000000637011043564064015167 0ustar tglxtglx include/linux/rcuclassic.h | 3 +++ include/linux/rcupreempt.h | 2 ++ kernel/rcuclassic.c | 19 ++++++++++++++++--- kernel/rcupreempt.c | 2 +- 4 files changed, 22 insertions(+), 4 deletions(-) Index: linux-2.6.26/include/linux/rcuclassic.h =================================================================== --- linux-2.6.26.orig/include/linux/rcuclassic.h +++ linux-2.6.26/include/linux/rcuclassic.h @@ -161,4 +161,7 @@ extern long rcu_batches_completed_bh(voi #define rcu_enter_nohz() do { } while (0) #define rcu_exit_nohz() do { } while (0) +struct softirq_action; +extern void rcu_process_callbacks(struct softirq_action *unused); + #endif /* __LINUX_RCUCLASSIC_H */ Index: linux-2.6.26/include/linux/rcupreempt.h =================================================================== --- linux-2.6.26.orig/include/linux/rcupreempt.h +++ linux-2.6.26/include/linux/rcupreempt.h @@ -134,4 +134,6 @@ static inline void rcu_exit_nohz(void) #define rcu_exit_nohz() do { } while (0) #endif /* CONFIG_NO_HZ */ +extern void rcu_process_callbacks(struct softirq_action *unused); + #endif /* __LINUX_RCUPREEMPT_H */ Index: linux-2.6.26/kernel/rcuclassic.c =================================================================== --- linux-2.6.26.orig/kernel/rcuclassic.c +++ linux-2.6.26/kernel/rcuclassic.c @@ -416,6 +416,8 @@ static void rcu_offline_cpu(int cpu) static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp, struct rcu_data *rdp) { + unsigned long flags; + if (rdp->curlist && !rcu_batch_before(rcp->completed, rdp->batch)) { *rdp->donetail = rdp->curlist; rdp->donetail = rdp->curtail; @@ -424,12 +426,12 @@ static void __rcu_process_callbacks(stru } if (rdp->nxtlist && !rdp->curlist) { - local_irq_disable(); + local_irq_save(flags); rdp->curlist = rdp->nxtlist; rdp->curtail = rdp->nxttail; rdp->nxtlist = NULL; rdp->nxttail = &rdp->nxtlist; - local_irq_enable(); + local_irq_restore(flags); /* * start the next batch of callbacks @@ -456,7 +458,7 @@ static void __rcu_process_callbacks(stru rcu_do_batch(rdp); } -static void rcu_process_callbacks(struct softirq_action *unused) +void rcu_process_callbacks(struct softirq_action *unused) { __rcu_process_callbacks(&rcu_ctrlblk, &__get_cpu_var(rcu_data)); __rcu_process_callbacks(&rcu_bh_ctrlblk, &__get_cpu_var(rcu_bh_data)); @@ -511,6 +513,17 @@ int rcu_needs_cpu(int cpu) return (!!rdp->curlist || !!rdp_bh->curlist || rcu_pending(cpu)); } +void rcu_advance_callbacks(int cpu, int user) +{ + if (user || + (idle_cpu(cpu) && !in_softirq() && + hardirq_count() <= (1 << HARDIRQ_SHIFT))) { + rcu_qsctr_inc(cpu); + rcu_bh_qsctr_inc(cpu); + } else if (!in_softirq()) + rcu_bh_qsctr_inc(cpu); +} + void rcu_check_callbacks(int cpu, int user) { if (user || Index: linux-2.6.26/kernel/rcupreempt.c =================================================================== --- linux-2.6.26.orig/kernel/rcupreempt.c +++ linux-2.6.26/kernel/rcupreempt.c @@ -944,7 +944,7 @@ void __cpuinit rcu_online_cpu(int cpu) spin_unlock_irqrestore(&rcu_ctrlblk.fliplock, flags); } -static void rcu_process_callbacks(struct softirq_action *unused) +void rcu_process_callbacks(struct softirq_action *unused) { unsigned long flags; struct rcu_head *next, *list; patches/rcu-new-7.patch0000664000076400007640000002022211043564063014002 0ustar tglxtglxFrom paulmck@linux.vnet.ibm.com Thu Sep 27 15:32:09 2007 Date: Mon, 10 Sep 2007 11:39:46 -0700 From: Paul E. McKenney To: linux-kernel@vger.kernel.org Cc: linux-rt-users@vger.kernel.org, mingo@elte.hu, akpm@linux-foundation.org, dipankar@in.ibm.com, josht@linux.vnet.ibm.com, tytso@us.ibm.com, dvhltc@us.ibm.com, tglx@linutronix.de, a.p.zijlstra@chello.nl, bunk@kernel.org, ego@in.ibm.com, oleg@tv-sign.ru, srostedt@redhat.com Subject: [PATCH RFC 7/9] RCU: rcutorture testing for RCU priority boosting Work in progress, not for inclusion. Still uses xtime because this patch is still against 2.6.22. This patch modifies rcutorture to also torture RCU priority boosting. The torturing involves forcing RCU read-side critical sections (already performed as part of the torturing of RCU) to run for extremely long time periods, increasing the probability of their being preempted and thus needing priority boosting. The fact that rcutorture's "nreaders" module parameter defaults to twice the number of CPUs helps ensure lots of the needed preemption. To cause the torturing to be fully effective in -mm, run in presence of CPU-hotplug operations. Signed-off-by: Paul E. McKenney --- kernel/rcutorture.c | 91 ++++++++++++++++++++++++++++++++++++++-------- kernel/time/timekeeping.c | 2 + 2 files changed, 79 insertions(+), 14 deletions(-) Index: linux-2.6.26/kernel/rcutorture.c =================================================================== --- linux-2.6.26.orig/kernel/rcutorture.c +++ linux-2.6.26/kernel/rcutorture.c @@ -58,6 +58,7 @@ static int stat_interval; /* Interval be static int verbose; /* Print more debug info. */ static int test_no_idle_hz; /* Test RCU's support for tickless idle CPUs. */ static int shuffle_interval = 5; /* Interval between shuffles (in sec)*/ +static int preempt_torture; /* Realtime task preempts torture readers. */ static char *torture_type = "rcu"; /* What RCU implementation to torture. */ module_param(nreaders, int, 0444); @@ -72,6 +73,8 @@ module_param(test_no_idle_hz, bool, 0444 MODULE_PARM_DESC(test_no_idle_hz, "Test support for tickless idle CPUs"); module_param(shuffle_interval, int, 0444); MODULE_PARM_DESC(shuffle_interval, "Number of seconds between shuffles"); +module_param(preempt_torture, bool, 0444); +MODULE_PARM_DESC(preempt_torture, "Enable realtime preemption torture"); module_param(torture_type, charp, 0444); MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, srcu)"); @@ -192,6 +195,8 @@ struct rcu_torture_ops { int (*completed)(void); void (*deferredfree)(struct rcu_torture *p); void (*sync)(void); + long (*preemptstart)(void); + void (*preemptend)(void); int (*stats)(char *page); char *name; }; @@ -256,16 +261,75 @@ static void rcu_torture_deferred_free(st call_rcu(&p->rtort_rcu, rcu_torture_cb); } +static struct task_struct *rcu_preeempt_task; +static unsigned long rcu_torture_preempt_errors; + +static int rcu_torture_preempt(void *arg) +{ + int completedstart; + int err; + time_t gcstart; + struct sched_param sp; + + sp.sched_priority = MAX_RT_PRIO - 1; + err = sched_setscheduler(current, SCHED_RR, &sp); + if (err != 0) + printk(KERN_ALERT "rcu_torture_preempt() priority err: %d\n", + err); + current->flags |= PF_NOFREEZE; + + do { + completedstart = rcu_torture_completed(); + gcstart = xtime.tv_sec; + while ((xtime.tv_sec - gcstart < 10) && + (rcu_torture_completed() == completedstart)) + cond_resched(); + if (rcu_torture_completed() == completedstart) + rcu_torture_preempt_errors++; + schedule_timeout_interruptible(1); + } while (!kthread_should_stop()); + return 0; +} + +static long rcu_preempt_start(void) +{ + long retval = 0; + + rcu_preeempt_task = kthread_run(rcu_torture_preempt, NULL, + "rcu_torture_preempt"); + if (IS_ERR(rcu_preeempt_task)) { + VERBOSE_PRINTK_ERRSTRING("Failed to create preempter"); + retval = PTR_ERR(rcu_preeempt_task); + rcu_preeempt_task = NULL; + } + return retval; +} + +static void rcu_preempt_end(void) +{ + if (rcu_preeempt_task != NULL) { + VERBOSE_PRINTK_STRING("Stopping rcu_preempt task"); + kthread_stop(rcu_preeempt_task); + } + rcu_preeempt_task = NULL; +} + +static int rcu_preempt_stats(char *page) +{ + return sprintf(page, + "Preemption stalls: %lu\n", rcu_torture_preempt_errors); +} + static struct rcu_torture_ops rcu_ops = { - .init = NULL, - .cleanup = NULL, .readlock = rcu_torture_read_lock, .readdelay = rcu_read_delay, .readunlock = rcu_torture_read_unlock, .completed = rcu_torture_completed, .deferredfree = rcu_torture_deferred_free, .sync = synchronize_rcu, - .stats = NULL, + .preemptstart = rcu_preempt_start, + .preemptend = rcu_preempt_end, + .stats = rcu_preempt_stats, .name = "rcu" }; @@ -297,14 +361,12 @@ static void rcu_sync_torture_init(void) static struct rcu_torture_ops rcu_sync_ops = { .init = rcu_sync_torture_init, - .cleanup = NULL, .readlock = rcu_torture_read_lock, .readdelay = rcu_read_delay, .readunlock = rcu_torture_read_unlock, .completed = rcu_torture_completed, .deferredfree = rcu_sync_torture_deferred_free, .sync = synchronize_rcu, - .stats = NULL, .name = "rcu_sync" }; @@ -356,28 +418,23 @@ static void rcu_bh_torture_synchronize(v } static struct rcu_torture_ops rcu_bh_ops = { - .init = NULL, - .cleanup = NULL, .readlock = rcu_bh_torture_read_lock, .readdelay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = rcu_bh_torture_read_unlock, .completed = rcu_bh_torture_completed, .deferredfree = rcu_bh_torture_deferred_free, .sync = rcu_bh_torture_synchronize, - .stats = NULL, .name = "rcu_bh" }; static struct rcu_torture_ops rcu_bh_sync_ops = { .init = rcu_sync_torture_init, - .cleanup = NULL, .readlock = rcu_bh_torture_read_lock, .readdelay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = rcu_bh_torture_read_unlock, .completed = rcu_bh_torture_completed, .deferredfree = rcu_sync_torture_deferred_free, .sync = rcu_bh_torture_synchronize, - .stats = NULL, .name = "rcu_bh_sync" }; @@ -489,14 +546,12 @@ static void sched_torture_synchronize(vo static struct rcu_torture_ops sched_ops = { .init = rcu_sync_torture_init, - .cleanup = NULL, .readlock = sched_torture_read_lock, .readdelay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = sched_torture_read_unlock, .completed = sched_torture_completed, .deferredfree = rcu_sync_torture_deferred_free, .sync = sched_torture_synchronize, - .stats = NULL, .name = "sched" }; @@ -791,9 +846,10 @@ rcu_torture_print_module_parms(char *tag printk(KERN_ALERT "%s" TORTURE_FLAG "--- %s: nreaders=%d nfakewriters=%d " "stat_interval=%d verbose=%d test_no_idle_hz=%d " - "shuffle_interval = %d\n", + "shuffle_interval=%d preempt_torture=%d\n", torture_type, tag, nrealreaders, nfakewriters, - stat_interval, verbose, test_no_idle_hz, shuffle_interval); + stat_interval, verbose, test_no_idle_hz, shuffle_interval, + preempt_torture); } static void @@ -846,6 +902,8 @@ rcu_torture_cleanup(void) kthread_stop(stats_task); } stats_task = NULL; + if (preempt_torture && (cur_ops->preemptend != NULL)) + cur_ops->preemptend(); /* Wait for all RCU callbacks to fire. */ rcu_barrier(); @@ -988,6 +1046,11 @@ rcu_torture_init(void) goto unwind; } } + if (preempt_torture && (cur_ops->preemptstart != NULL)) { + firsterr = cur_ops->preemptstart(); + if (firsterr != 0) + goto unwind; + } return 0; unwind: Index: linux-2.6.26/kernel/time/timekeeping.c =================================================================== --- linux-2.6.26.orig/kernel/time/timekeeping.c +++ linux-2.6.26/kernel/time/timekeeping.c @@ -26,6 +26,7 @@ */ __cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock); +EXPORT_SYMBOL_GPL(xtime_lock); /* * The current time @@ -45,6 +46,7 @@ __cacheline_aligned_in_smp DEFINE_SEQLOC struct timespec xtime __attribute__ ((aligned (16))); struct timespec wall_to_monotonic __attribute__ ((aligned (16))); static unsigned long total_sleep_time; /* seconds */ +EXPORT_SYMBOL_GPL(xtime); static struct timespec xtime_cache __attribute__ ((aligned (16))); void update_xtime_cache(u64 nsec) patches/rcu-torture-preempt-update.patch0000664000076400007640000001214411043564063017507 0ustar tglxtglx--- kernel/rcutorture.c | 69 ++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 54 insertions(+), 15 deletions(-) Index: linux-2.6.26/kernel/rcutorture.c =================================================================== --- linux-2.6.26.orig/kernel/rcutorture.c +++ linux-2.6.26/kernel/rcutorture.c @@ -53,6 +53,7 @@ MODULE_AUTHOR("Paul E. McKenney rtort_rcu, rcu_torture_cb); } -static struct task_struct *rcu_preeempt_task; static unsigned long rcu_torture_preempt_errors; static int rcu_torture_preempt(void *arg) @@ -271,7 +273,7 @@ static int rcu_torture_preempt(void *arg time_t gcstart; struct sched_param sp; - sp.sched_priority = MAX_RT_PRIO - 1; + sp.sched_priority = 1; err = sched_setscheduler(current, SCHED_RR, &sp); if (err != 0) printk(KERN_ALERT "rcu_torture_preempt() priority err: %d\n", @@ -294,24 +296,43 @@ static int rcu_torture_preempt(void *arg static long rcu_preempt_start(void) { long retval = 0; + int i; - rcu_preeempt_task = kthread_run(rcu_torture_preempt, NULL, - "rcu_torture_preempt"); - if (IS_ERR(rcu_preeempt_task)) { - VERBOSE_PRINTK_ERRSTRING("Failed to create preempter"); - retval = PTR_ERR(rcu_preeempt_task); - rcu_preeempt_task = NULL; + rcu_preempt_tasks = kzalloc(nrealpreempthogs * sizeof(rcu_preempt_tasks[0]), + GFP_KERNEL); + if (rcu_preempt_tasks == NULL) { + VERBOSE_PRINTK_ERRSTRING("out of memory"); + retval = -ENOMEM; + goto out; } + + for (i=0; i < nrealpreempthogs; i++) { + rcu_preempt_tasks[i] = kthread_run(rcu_torture_preempt, NULL, + "rcu_torture_preempt"); + if (IS_ERR(rcu_preempt_tasks[i])) { + VERBOSE_PRINTK_ERRSTRING("Failed to create preempter"); + retval = PTR_ERR(rcu_preempt_tasks[i]); + rcu_preempt_tasks[i] = NULL; + break; + } + } + out: return retval; } static void rcu_preempt_end(void) { - if (rcu_preeempt_task != NULL) { - VERBOSE_PRINTK_STRING("Stopping rcu_preempt task"); - kthread_stop(rcu_preeempt_task); + int i; + if (rcu_preempt_tasks) { + for (i=0; i < nrealpreempthogs; i++) { + if (rcu_preempt_tasks[i] != NULL) { + VERBOSE_PRINTK_STRING("Stopping rcu_preempt task"); + kthread_stop(rcu_preempt_tasks[i]); + } + rcu_preempt_tasks[i] = NULL; + } + kfree(rcu_preempt_tasks); } - rcu_preeempt_task = NULL; } static int rcu_preempt_stats(char *page) @@ -606,10 +627,20 @@ rcu_torture_writer(void *arg) static int rcu_torture_fakewriter(void *arg) { + struct sched_param sp; + long id = (long) arg; + int err; DEFINE_RCU_RANDOM(rand); VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task started"); - set_user_nice(current, 19); + /* + * Set up at a higher prio than the readers. + */ + sp.sched_priority = 1 + id; + err = sched_setscheduler(current, SCHED_RR, &sp); + if (err != 0) + printk(KERN_ALERT "rcu_torture_writer() priority err: %d\n", + err); do { schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10); @@ -845,9 +876,11 @@ rcu_torture_print_module_parms(char *tag { printk(KERN_ALERT "%s" TORTURE_FLAG "--- %s: nreaders=%d nfakewriters=%d " + "npreempthogs=%d " "stat_interval=%d verbose=%d test_no_idle_hz=%d " "shuffle_interval=%d preempt_torture=%d\n", torture_type, tag, nrealreaders, nfakewriters, + nrealpreempthogs, stat_interval, verbose, test_no_idle_hz, shuffle_interval, preempt_torture); } @@ -921,7 +954,7 @@ rcu_torture_cleanup(void) static int __init rcu_torture_init(void) { - int i; + long i; int cpu; int firsterr = 0; static struct rcu_torture_ops *torture_ops[] = @@ -949,6 +982,12 @@ rcu_torture_init(void) rcu_torture_print_module_parms("Start of test"); fullstop = 0; + if (npreempthogs >= 0) + nrealpreempthogs = npreempthogs; + else + nrealpreempthogs = num_online_cpus() == 1 ? 1 : + num_online_cpus() - 1; + /* Set up the freelist. */ INIT_LIST_HEAD(&rcu_torture_freelist); @@ -996,7 +1035,7 @@ rcu_torture_init(void) } for (i = 0; i < nfakewriters; i++) { VERBOSE_PRINTK_STRING("Creating rcu_torture_fakewriter task"); - fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL, + fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, (void*)i, "rcu_torture_fakewriter"); if (IS_ERR(fakewriter_tasks[i])) { firsterr = PTR_ERR(fakewriter_tasks[i]); patches/rcupreempt-boost-early-init.patch0000664000076400007640000000560311043564063017651 0ustar tglxtglx--- include/linux/rcuclassic.h | 1 + include/linux/rcupreempt.h | 8 +++++++- kernel/rcupreempt-boost.c | 16 +++++++++++----- kernel/rcupreempt.c | 2 ++ 4 files changed, 21 insertions(+), 6 deletions(-) Index: linux-2.6.26/include/linux/rcuclassic.h =================================================================== --- linux-2.6.26.orig/include/linux/rcuclassic.h +++ linux-2.6.26/include/linux/rcuclassic.h @@ -160,6 +160,7 @@ extern long rcu_batches_completed_bh(voi #define rcu_enter_nohz() do { } while (0) #define rcu_exit_nohz() do { } while (0) +#define rcu_preempt_boost_init() do { } while (0) struct softirq_action; extern void rcu_process_callbacks(struct softirq_action *unused); Index: linux-2.6.26/include/linux/rcupreempt.h =================================================================== --- linux-2.6.26.orig/include/linux/rcupreempt.h +++ linux-2.6.26/include/linux/rcupreempt.h @@ -62,7 +62,13 @@ enum rcu_boost_state { #define N_RCU_BOOST_STATE (RCU_BOOST_INVALID + 1) -#endif /* #ifdef CONFIG_PREEMPT_RCU_BOOST */ +int __init rcu_preempt_boost_init(void); + +#else /* CONFIG_PREEPMT_RCU_BOOST */ + +#define rcu_preempt_boost_init() do { } while (0) + +#endif /* CONFIG_PREEMPT_RCU_BOOST */ extern void __rcu_read_lock(void) __acquires(RCU); extern void __rcu_read_unlock(void) __releases(RCU); Index: linux-2.6.26/kernel/rcupreempt-boost.c =================================================================== --- linux-2.6.26.orig/kernel/rcupreempt-boost.c +++ linux-2.6.26/kernel/rcupreempt-boost.c @@ -174,9 +174,9 @@ int rcu_trace_boost_create(struct dentry rcuboostdir = debugfs_create_file("rcuboost", 0444, rcudir, NULL, &rcuboost_fops); if (!rcuboostdir) - return 1; + return 0; - return 0; + return 1; } EXPORT_SYMBOL_GPL(rcu_trace_boost_create); @@ -552,10 +552,9 @@ static int krcupreemptd(void *data) return 0; } -static int __init rcu_preempt_boost_init(void) +int __init rcu_preempt_boost_init(void) { struct rcu_boost_dat *rbd; - struct task_struct *p; int cpu; for_each_possible_cpu(cpu) { @@ -567,6 +566,13 @@ static int __init rcu_preempt_boost_init INIT_LIST_HEAD(&rbd->rbs_boosted); } + return 0; +} + +static int __init rcu_preempt_start_krcupreemptd(void) +{ + struct task_struct *p; + p = kthread_create(krcupreemptd, NULL, "krcupreemptd"); @@ -579,4 +585,4 @@ static int __init rcu_preempt_boost_init return 0; } -core_initcall(rcu_preempt_boost_init); +__initcall(rcu_preempt_start_krcupreemptd); Index: linux-2.6.26/kernel/rcupreempt.c =================================================================== --- linux-2.6.26.orig/kernel/rcupreempt.c +++ linux-2.6.26/kernel/rcupreempt.c @@ -1122,6 +1122,8 @@ void __init __rcu_init(void) rcu_cpu_notify(&rcu_nb, CPU_UP_PREPARE, (void *)(long) cpu); open_softirq(RCU_SOFTIRQ, rcu_process_callbacks, NULL); + + rcu_preempt_boost_init(); } /* patches/rt_mutex_setprio.patch0000664000076400007640000000563211043564063015702 0ustar tglxtglxSubject: rt: rename rt_mutex_setprio to task_setprio With there being multiple non-mutex users of this function its past time it got renamed. Signed-off-by: Peter Zijlstra --- include/linux/sched.h | 7 ++++++- kernel/rcupreempt-boost.c | 4 ++-- kernel/sched.c | 12 +++++------- 3 files changed, 13 insertions(+), 10 deletions(-) Index: linux-2.6.26/include/linux/sched.h =================================================================== --- linux-2.6.26.orig/include/linux/sched.h +++ linux-2.6.26/include/linux/sched.h @@ -1658,9 +1658,14 @@ int sched_rt_handler(struct ctl_table *t extern unsigned int sysctl_sched_compat_yield; +extern void task_setprio(struct task_struct *p, int prio); + #ifdef CONFIG_RT_MUTEXES extern int rt_mutex_getprio(struct task_struct *p); -extern void rt_mutex_setprio(struct task_struct *p, int prio); +static inline void rt_mutex_setprio(struct task_struct *p, int prio) +{ + task_setprio(p, prio); +} extern void rt_mutex_adjust_pi(struct task_struct *p); #else static inline int rt_mutex_getprio(struct task_struct *p) Index: linux-2.6.26/kernel/rcupreempt-boost.c =================================================================== --- linux-2.6.26.orig/kernel/rcupreempt-boost.c +++ linux-2.6.26/kernel/rcupreempt-boost.c @@ -238,7 +238,7 @@ static void rcu_boost_task(struct task_s if (task->rcu_prio < task->prio) { rcu_trace_boost_task_boosted(RCU_BOOST_ME); - rt_mutex_setprio(task, task->rcu_prio); + task_setprio(task, task->rcu_prio); } } @@ -357,7 +357,7 @@ void __rcu_preempt_unboost(void) spin_lock(&curr->pi_lock); prio = rt_mutex_getprio(curr); - rt_mutex_setprio(curr, prio); + task_setprio(curr, prio); curr->rcub_rbdp = NULL; Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -4534,19 +4534,19 @@ long __sched sleep_on_timeout(wait_queue } EXPORT_SYMBOL(sleep_on_timeout); -#ifdef CONFIG_RT_MUTEXES - /* - * rt_mutex_setprio - set the current priority of a task + * task_setprio - set the current priority of a task * @p: task * @prio: prio value (kernel-internal form) * * This function changes the 'effective' priority of a task. It does * not touch ->normal_prio like __setscheduler(). * - * Used by the rt_mutex code to implement priority inheritance logic. + * Used by the rt_mutex code to implement priority inheritance logic + * and by rcupreempt-boost to boost priorities of tasks sleeping + * with rcu locks. */ -void rt_mutex_setprio(struct task_struct *p, int prio) +void task_setprio(struct task_struct *p, int prio) { unsigned long flags; int oldprio, on_rq, running; @@ -4583,8 +4583,6 @@ void rt_mutex_setprio(struct task_struct task_rq_unlock(rq, &flags); } -#endif - void set_user_nice(struct task_struct *p, long nice) { int old_prio, delta, on_rq; patches/qrcu.patch0000664000076400007640000001456511043564062013244 0ustar tglxtglxFrom: "Paul E. McKenney" Subject: [PATCH] QRCU with lockless fastpath Hello! This is an updated version of Oleg Nesterov's QRCU that avoids the earlier lock acquisition on the synchronize_qrcu() fastpath. This passes rcutorture on x86 and the weakly ordered POWER. A promela model of the code passes as noted before for 2 readers and 3 updaters and for 3 readers and 2 updaters. 3 readers and 3 updaters runs every machine that I have access to out of memory -- nothing like a little combinatorial explosion! However, after some thought, the proof ended up being simple enough: 1. If synchronize_qrcu() exits too soon, then by definition there has been a reader present during synchronize_srcu()'s full execution. 2. The counter corresponding to this reader will be at least 1 at all times. 3. The synchronize_qrcu() code forces at least one of the counters to be at least one at all times -- if there is a reader, the sum will be at least two. (Unfortunately, we cannot fetch the pair of counters atomically.) 4. Therefore, the only way that synchronize_qrcu()s fastpath can see a sum of 1 is if it races with another synchronize_qrcu() -- the first synchronize_qrcu() must read one of the counters before the second synchronize_qrcu() increments it, and must read the other counter after the second synchronize_qrcu() decrements it. There can be at most one reader present through this entire operation -- otherwise, the first synchronize_qrcu() will see a sum of 2 or greater. 5. But the second synchronize_qrcu() will not release the mutex until after the reader is done. During this time, the first synchronize_qrcu() will always see a sum of at least 2, and therefore cannot take the remainder of the fastpath until the reader is done. 6. Because the second synchronize_qrcu() holds the mutex, no other synchronize_qrcu() can manipulate the counters until the reader is done. A repeat of the race called out in #4 above therefore cannot happen until after the reader is done, in which case it is safe for the first synchronize_qrcu() to proceed. Therefore, two summations of the counter separated by a memory barrier suffices and the implementation shown below also suffices. (And, yes, the fastpath -could- check for a sum of zero and exit immediately, but this would help only in case of a three-way race between two synchronize_qrcu()s and a qrcu_read_unlock(), would add another compare, so is not worth it.) Signed-off-by: Paul E. McKenney --- include/linux/srcu.h | 22 +++++++++++++ kernel/srcu.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 108 insertions(+) Index: linux-2.6.26/include/linux/srcu.h =================================================================== --- linux-2.6.26.orig/include/linux/srcu.h +++ linux-2.6.26/include/linux/srcu.h @@ -27,6 +27,8 @@ #ifndef _LINUX_SRCU_H #define _LINUX_SRCU_H +#include + struct srcu_struct_array { int c[2]; }; @@ -50,4 +52,24 @@ void srcu_read_unlock(struct srcu_struct void synchronize_srcu(struct srcu_struct *sp); long srcu_batches_completed(struct srcu_struct *sp); +/* + * fully compatible with srcu, but optimized for writers. + */ + +struct qrcu_struct { + int completed; + atomic_t ctr[2]; + wait_queue_head_t wq; + struct mutex mutex; +}; + +int init_qrcu_struct(struct qrcu_struct *qp); +int qrcu_read_lock(struct qrcu_struct *qp); +void qrcu_read_unlock(struct qrcu_struct *qp, int idx); +void synchronize_qrcu(struct qrcu_struct *qp); + +static inline void cleanup_qrcu_struct(struct qrcu_struct *qp) +{ +} + #endif Index: linux-2.6.26/kernel/srcu.c =================================================================== --- linux-2.6.26.orig/kernel/srcu.c +++ linux-2.6.26/kernel/srcu.c @@ -255,3 +255,89 @@ EXPORT_SYMBOL_GPL(srcu_read_lock); EXPORT_SYMBOL_GPL(srcu_read_unlock); EXPORT_SYMBOL_GPL(synchronize_srcu); EXPORT_SYMBOL_GPL(srcu_batches_completed); + +int init_qrcu_struct(struct qrcu_struct *qp) +{ + qp->completed = 0; + atomic_set(qp->ctr + 0, 1); + atomic_set(qp->ctr + 1, 0); + init_waitqueue_head(&qp->wq); + mutex_init(&qp->mutex); + + return 0; +} + +int qrcu_read_lock(struct qrcu_struct *qp) +{ + for (;;) { + int idx = qp->completed & 0x1; + if (likely(atomic_inc_not_zero(qp->ctr + idx))) + return idx; + } +} + +void qrcu_read_unlock(struct qrcu_struct *qp, int idx) +{ + if (atomic_dec_and_test(qp->ctr + idx)) + wake_up(&qp->wq); +} + +void synchronize_qrcu(struct qrcu_struct *qp) +{ + int idx; + + smp_mb(); /* Force preceding change to happen before fastpath check. */ + + /* + * Fastpath: If the two counters sum to "1" at a given point in + * time, there are no readers. However, it takes two separate + * loads to sample both counters, which won't occur simultaneously. + * So we might race with a counter switch, so that we might see + * ctr[0]==0, then the counter might switch, then we might see + * ctr[1]==1 (unbeknownst to us because there is a reader still + * there). So we do a read memory barrier and recheck. If the + * same race happens again, there must have been a second counter + * switch. This second counter switch could not have happened + * until all preceding readers finished, so if the condition + * is true both times, we may safely proceed. + * + * This relies critically on the atomic increment and atomic + * decrement being seen as executing in order. + */ + + if (atomic_read(&qp->ctr[0]) + atomic_read(&qp->ctr[1]) <= 1) { + smp_rmb(); /* Keep two checks independent. */ + if (atomic_read(&qp->ctr[0]) + atomic_read(&qp->ctr[1]) <= 1) + goto out; + } + + mutex_lock(&qp->mutex); + + idx = qp->completed & 0x1; + if (atomic_read(qp->ctr + idx) == 1) + goto out_unlock; + + atomic_inc(qp->ctr + (idx ^ 0x1)); + + /* + * Prevent subsequent decrement from being seen before previous + * increment -- such an inversion could cause the fastpath + * above to falsely conclude that there were no readers. Also, + * reduce the likelihood that qrcu_read_lock() will loop. + */ + + smp_mb__after_atomic_inc(); + qp->completed++; + + atomic_dec(qp->ctr + idx); + __wait_event(qp->wq, !atomic_read(qp->ctr + idx)); +out_unlock: + mutex_unlock(&qp->mutex); +out: + smp_mb(); /* force subsequent free after qrcu_read_unlock(). */ +} + +EXPORT_SYMBOL_GPL(init_qrcu_struct); +EXPORT_SYMBOL_GPL(qrcu_read_lock); +EXPORT_SYMBOL_GPL(qrcu_read_unlock); +EXPORT_SYMBOL_GPL(synchronize_qrcu); patches/rcu-preempt-hotplug-hackaround.patch0000664000076400007640000000071111043564062020316 0ustar tglxtglx--- kernel/sched.c | 1 - 1 file changed, 1 deletion(-) Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -7314,7 +7314,6 @@ static void detach_destroy_domains(const for_each_cpu_mask(i, *cpu_map) cpu_attach_domain(NULL, &def_root_domain, i); - synchronize_sched(); arch_destroy_sched_domains(cpu_map, &tmpmask); } patches/call_rcu_bh-rename-of-call_rcu.patch0000664000076400007640000000203511043564062020145 0ustar tglxtglxSubject: [PATCH] just rename call_rcu_bh instead of making it a macro Seems that I found a box that has a config that passes call_rcu_bh as a function pointer (see net/sctp/sm_make_chunk.c), so declaring the call_rcu_bh has a macro function isn't good enough. This patch makes it just another name of call_rcu for rcupreempt. Signed-off-by: Steven Rostedt --- include/linux/rcupreempt.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) Index: linux-2.6.26/include/linux/rcupreempt.h =================================================================== --- linux-2.6.26.orig/include/linux/rcupreempt.h +++ linux-2.6.26/include/linux/rcupreempt.h @@ -42,7 +42,13 @@ #define rcu_qsctr_inc(cpu) #define rcu_bh_qsctr_inc(cpu) -#define call_rcu_bh(head, rcu) call_rcu(head, rcu) + +/* + * Someone might want to pass call_rcu_bh as a function pointer. + * So this needs to just be a rename and not a macro function. + * (no parentheses) + */ +#define call_rcu_bh call_rcu #ifdef CONFIG_PREEMPT_RCU_BOOST /* patches/sched-use-a-2d-bitmap-search-prio-cpu.patch0000664000076400007640000003025111043564062021132 0ustar tglxtglxcommit b90648136bb66f4525653bf65e47e84b22d9d6bb Author: Gregory Haskins Date: Mon Apr 21 14:10:21 2008 -0400 sched: use a 2-d bitmap for searching lowest-pri CPU The current code use a linear algorithm which causes scaling issues on larger SMP machines. This patch replaces that algorithm with a 2-dimensional bitmap to reduce latencies in the wake-up path. Signed-off-by: Gregory Haskins Acked-by: Steven Rostedt Signed-off-by: Ingo Molnar --- kernel/Makefile | 1 kernel/sched.c | 7 ++ kernel/sched_cpupri.c | 174 ++++++++++++++++++++++++++++++++++++++++++++++++++ kernel/sched_cpupri.h | 36 ++++++++++ kernel/sched_rt.c | 98 ++++++---------------------- 5 files changed, 239 insertions(+), 77 deletions(-) Index: linux-2.6.26/kernel/Makefile =================================================================== --- linux-2.6.26.orig/kernel/Makefile +++ linux-2.6.26/kernel/Makefile @@ -70,6 +70,7 @@ obj-$(CONFIG_TASK_DELAY_ACCT) += delayac obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o obj-$(CONFIG_MARKERS) += marker.o obj-$(CONFIG_LATENCYTOP) += latencytop.o +obj-$(CONFIG_SMP) += sched_cpupri.o ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y) # According to Alan Modra , the -fno-omit-frame-pointer is Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -74,6 +74,8 @@ #include #include +#include "sched_cpupri.h" + /* * Convert user-nice values [ -20 ... 0 ... 19 ] * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ], @@ -452,6 +454,9 @@ struct root_domain { */ cpumask_t rto_mask; atomic_t rto_count; +#ifdef CONFIG_SMP + struct cpupri cpupri; +#endif }; /* @@ -6416,6 +6421,8 @@ static void init_rootdomain(struct root_ cpus_clear(rd->span); cpus_clear(rd->online); + + cpupri_init(&rd->cpupri); } static void init_defrootdomain(void) Index: linux-2.6.26/kernel/sched_cpupri.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/sched_cpupri.c @@ -0,0 +1,174 @@ +/* + * kernel/sched_cpupri.c + * + * CPU priority management + * + * Copyright (C) 2007-2008 Novell + * + * Author: Gregory Haskins + * + * This code tracks the priority of each CPU so that global migration + * decisions are easy to calculate. Each CPU can be in a state as follows: + * + * (INVALID), IDLE, NORMAL, RT1, ... RT99 + * + * going from the lowest priority to the highest. CPUs in the INVALID state + * are not eligible for routing. The system maintains this state with + * a 2 dimensional bitmap (the first for priority class, the second for cpus + * in that class). Therefore a typical application without affinity + * restrictions can find a suitable CPU with O(1) complexity (e.g. two bit + * searches). For tasks with affinity restrictions, the algorithm has a + * worst case complexity of O(min(102, nr_domcpus)), though the scenario that + * yields the worst case search is fairly contrived. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; version 2 + * of the License. + */ + +#include "sched_cpupri.h" + +/* Convert between a 140 based task->prio, and our 102 based cpupri */ +static int convert_prio(int prio) +{ + int cpupri; + + if (prio == CPUPRI_INVALID) + cpupri = CPUPRI_INVALID; + else if (prio == MAX_PRIO) + cpupri = CPUPRI_IDLE; + else if (prio >= MAX_RT_PRIO) + cpupri = CPUPRI_NORMAL; + else + cpupri = MAX_RT_PRIO - prio + 1; + + return cpupri; +} + +#define for_each_cpupri_active(array, idx) \ + for (idx = find_first_bit(array, CPUPRI_NR_PRIORITIES); \ + idx < CPUPRI_NR_PRIORITIES; \ + idx = find_next_bit(array, CPUPRI_NR_PRIORITIES, idx+1)) + +/** + * cpupri_find - find the best (lowest-pri) CPU in the system + * @cp: The cpupri context + * @p: The task + * @lowest_mask: A mask to fill in with selected CPUs + * + * Note: This function returns the recommended CPUs as calculated during the + * current invokation. By the time the call returns, the CPUs may have in + * fact changed priorities any number of times. While not ideal, it is not + * an issue of correctness since the normal rebalancer logic will correct + * any discrepancies created by racing against the uncertainty of the current + * priority configuration. + * + * Returns: (int)bool - CPUs were found + */ +int cpupri_find(struct cpupri *cp, struct task_struct *p, + cpumask_t *lowest_mask) +{ + int idx = 0; + int task_pri = convert_prio(p->prio); + + for_each_cpupri_active(cp->pri_active, idx) { + struct cpupri_vec *vec = &cp->pri_to_cpu[idx]; + cpumask_t mask; + + if (idx >= task_pri) + break; + + cpus_and(mask, p->cpus_allowed, vec->mask); + + if (cpus_empty(mask)) + continue; + + *lowest_mask = mask; + return 1; + } + + return 0; +} + +/** + * cpupri_set - update the cpu priority setting + * @cp: The cpupri context + * @cpu: The target cpu + * @pri: The priority (INVALID-RT99) to assign to this CPU + * + * Note: Assumes cpu_rq(cpu)->lock is locked + * + * Returns: (void) + */ +void cpupri_set(struct cpupri *cp, int cpu, int newpri) +{ + int *currpri = &cp->cpu_to_pri[cpu]; + int oldpri = *currpri; + unsigned long flags; + + newpri = convert_prio(newpri); + + BUG_ON(newpri >= CPUPRI_NR_PRIORITIES); + + if (newpri == oldpri) + return; + + /* + * If the cpu was currently mapped to a different value, we + * first need to unmap the old value + */ + if (likely(oldpri != CPUPRI_INVALID)) { + struct cpupri_vec *vec = &cp->pri_to_cpu[oldpri]; + + spin_lock_irqsave(&vec->lock, flags); + + vec->count--; + if (!vec->count) + clear_bit(oldpri, cp->pri_active); + cpu_clear(cpu, vec->mask); + + spin_unlock_irqrestore(&vec->lock, flags); + } + + if (likely(newpri != CPUPRI_INVALID)) { + struct cpupri_vec *vec = &cp->pri_to_cpu[newpri]; + + spin_lock_irqsave(&vec->lock, flags); + + cpu_set(cpu, vec->mask); + vec->count++; + if (vec->count == 1) + set_bit(newpri, cp->pri_active); + + spin_unlock_irqrestore(&vec->lock, flags); + } + + *currpri = newpri; +} + +/** + * cpupri_init - initialize the cpupri structure + * @cp: The cpupri context + * + * Returns: (void) + */ +void cpupri_init(struct cpupri *cp) +{ + int i; + + memset(cp, 0, sizeof(*cp)); + + for (i = 0; i < CPUPRI_NR_PRIORITIES; i++) { + struct cpupri_vec *vec = &cp->pri_to_cpu[i]; + + spin_lock_init(&vec->lock); + vec->count = 0; + cpus_clear(vec->mask); + } + + for_each_possible_cpu(i) + cp->cpu_to_pri[i] = CPUPRI_INVALID; +} + + Index: linux-2.6.26/kernel/sched_cpupri.h =================================================================== --- /dev/null +++ linux-2.6.26/kernel/sched_cpupri.h @@ -0,0 +1,36 @@ +#ifndef _LINUX_CPUPRI_H +#define _LINUX_CPUPRI_H + +#include + +#define CPUPRI_NR_PRIORITIES 2+MAX_RT_PRIO +#define CPUPRI_NR_PRI_WORDS CPUPRI_NR_PRIORITIES/BITS_PER_LONG + +#define CPUPRI_INVALID -1 +#define CPUPRI_IDLE 0 +#define CPUPRI_NORMAL 1 +/* values 2-101 are RT priorities 0-99 */ + +struct cpupri_vec { + spinlock_t lock; + int count; + cpumask_t mask; +}; + +struct cpupri { + struct cpupri_vec pri_to_cpu[CPUPRI_NR_PRIORITIES]; + long pri_active[CPUPRI_NR_PRI_WORDS]; + int cpu_to_pri[NR_CPUS]; +}; + +#ifdef CONFIG_SMP +int cpupri_find(struct cpupri *cp, + struct task_struct *p, cpumask_t *lowest_mask); +void cpupri_set(struct cpupri *cp, int cpu, int pri); +void cpupri_init(struct cpupri *cp); +#else +#define cpupri_set(cp, cpu, pri) do { } while (0) +#define cpupri_init() do { } while (0) +#endif + +#endif /* _LINUX_CPUPRI_H */ Index: linux-2.6.26/kernel/sched_rt.c =================================================================== --- linux-2.6.26.orig/kernel/sched_rt.c +++ linux-2.6.26/kernel/sched_rt.c @@ -392,8 +392,11 @@ void inc_rt_tasks(struct sched_rt_entity WARN_ON(!rt_prio(rt_se_prio(rt_se))); rt_rq->rt_nr_running++; #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED - if (rt_se_prio(rt_se) < rt_rq->highest_prio) + if (rt_se_prio(rt_se) < rt_rq->highest_prio) { + struct rq *rq = rq_of_rt_rq(rt_rq); rt_rq->highest_prio = rt_se_prio(rt_se); + cpupri_set(&rq->rd->cpupri, rq->cpu, rt_se_prio(rt_se)); + } #endif #ifdef CONFIG_SMP if (rt_se->nr_cpus_allowed > 1) { @@ -417,6 +420,10 @@ void inc_rt_tasks(struct sched_rt_entity static inline void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) { +#ifdef CONFIG_SMP + int highest_prio = rt_rq->highest_prio; +#endif + WARN_ON(!rt_prio(rt_se_prio(rt_se))); WARN_ON(!rt_rq->rt_nr_running); rt_rq->rt_nr_running--; @@ -440,6 +447,11 @@ void dec_rt_tasks(struct sched_rt_entity rq->rt.rt_nr_migratory--; } + if (rt_rq->highest_prio != highest_prio) { + struct rq *rq = rq_of_rt_rq(rt_rq); + cpupri_set(&rq->rd->cpupri, rq->cpu, rt_rq->highest_prio); + } + update_rt_migration(rq_of_rt_rq(rt_rq)); #endif /* CONFIG_SMP */ #ifdef CONFIG_RT_GROUP_SCHED @@ -720,73 +732,6 @@ static struct task_struct *pick_next_hig static DEFINE_PER_CPU(cpumask_t, local_cpu_mask); -static int find_lowest_cpus(struct task_struct *task, cpumask_t *lowest_mask) -{ - int lowest_prio = -1; - int lowest_cpu = -1; - int count = 0; - int cpu; - - cpus_and(*lowest_mask, task_rq(task)->rd->online, task->cpus_allowed); - - /* - * Scan each rq for the lowest prio. - */ - for_each_cpu_mask(cpu, *lowest_mask) { - struct rq *rq = cpu_rq(cpu); - - /* We look for lowest RT prio or non-rt CPU */ - if (rq->rt.highest_prio >= MAX_RT_PRIO) { - /* - * if we already found a low RT queue - * and now we found this non-rt queue - * clear the mask and set our bit. - * Otherwise just return the queue as is - * and the count==1 will cause the algorithm - * to use the first bit found. - */ - if (lowest_cpu != -1) { - cpus_clear(*lowest_mask); - cpu_set(rq->cpu, *lowest_mask); - } - return 1; - } - - /* no locking for now */ - if ((rq->rt.highest_prio > task->prio) - && (rq->rt.highest_prio >= lowest_prio)) { - if (rq->rt.highest_prio > lowest_prio) { - /* new low - clear old data */ - lowest_prio = rq->rt.highest_prio; - lowest_cpu = cpu; - count = 0; - } - count++; - } else - cpu_clear(cpu, *lowest_mask); - } - - /* - * Clear out all the set bits that represent - * runqueues that were of higher prio than - * the lowest_prio. - */ - if (lowest_cpu > 0) { - /* - * Perhaps we could add another cpumask op to - * zero out bits. Like cpu_zero_bits(cpumask, nrbits); - * Then that could be optimized to use memset and such. - */ - for_each_cpu_mask(cpu, *lowest_mask) { - if (cpu >= lowest_cpu) - break; - cpu_clear(cpu, *lowest_mask); - } - } - - return count; -} - static inline int pick_optimal_cpu(int this_cpu, cpumask_t *mask) { int first; @@ -808,17 +753,12 @@ static int find_lowest_rq(struct task_st cpumask_t *lowest_mask = &__get_cpu_var(local_cpu_mask); int this_cpu = smp_processor_id(); int cpu = task_cpu(task); - int count = find_lowest_cpus(task, lowest_mask); - if (!count) - return -1; /* No targets found */ + if (task->rt.nr_cpus_allowed == 1) + return -1; /* No other targets possible */ - /* - * There is no sense in performing an optimal search if only one - * target is found. - */ - if (count == 1) - return first_cpu(*lowest_mask); + if (!cpupri_find(&task_rq(task)->rd->cpupri, task, lowest_mask)) + return -1; /* No targets found */ /* * At this point we have built a mask of cpus representing the @@ -1167,6 +1107,8 @@ static void join_domain_rt(struct rq *rq { if (rq->rt.overloaded) rt_set_overload(rq); + + cpupri_set(&rq->rd->cpupri, rq->cpu, rq->rt.highest_prio); } /* Assumes rq->lock is held */ @@ -1174,6 +1116,8 @@ static void leave_domain_rt(struct rq *r { if (rq->rt.overloaded) rt_clear_overload(rq); + + cpupri_set(&rq->rd->cpupri, rq->cpu, CPUPRI_INVALID); } /* patches/ftrace-upstream.patch0000664000076400007640000075222611043564062015377 0ustar tglxtglx--- Makefile | 4 arch/arm/Kconfig | 2 arch/arm/boot/compressed/Makefile | 6 arch/arm/kernel/Makefile | 5 arch/arm/kernel/armksyms.c | 5 arch/arm/kernel/entry-common.S | 51 arch/arm/kernel/ftrace.c | 116 + arch/powerpc/Kconfig | 4 arch/powerpc/kernel/Makefile | 14 arch/powerpc/kernel/entry_32.S | 129 + arch/powerpc/kernel/entry_64.S | 65 arch/powerpc/kernel/ftrace.c | 154 + arch/powerpc/kernel/io.c | 3 arch/powerpc/kernel/irq.c | 6 arch/powerpc/kernel/setup_32.c | 6 arch/powerpc/platforms/powermac/Makefile | 5 arch/sparc64/Kconfig | 2 arch/sparc64/Kconfig.debug | 2 arch/sparc64/kernel/Makefile | 1 arch/sparc64/kernel/ftrace.c | 94 arch/sparc64/lib/mcount.S | 58 arch/x86/Kconfig | 2 arch/x86/kernel/Makefile | 8 arch/x86/kernel/alternative.c | 22 arch/x86/kernel/entry_32.S | 72 arch/x86/kernel/entry_64.S | 108 + arch/x86/kernel/ftrace.c | 141 + arch/x86/kernel/i386_ksyms_32.c | 8 arch/x86/kernel/process_32.c | 3 arch/x86/kernel/process_64.c | 3 arch/x86/kernel/tsc_32.c | 2 arch/x86/kernel/vsyscall_64.c | 3 arch/x86/kernel/x8664_ksyms_64.c | 6 arch/x86/lib/Makefile | 1 arch/x86/lib/thunk_32.S | 47 arch/x86/lib/thunk_64.S | 19 arch/x86/mm/init_32.c | 4 arch/x86/mm/init_64.c | 10 arch/x86/vdso/vclock_gettime.c | 15 arch/x86/vdso/vgetcpu.c | 3 include/asm-arm/ftrace.h | 14 include/asm-powerpc/ftrace.h | 14 include/asm-sparc64/ftrace.h | 14 include/asm-x86/alternative.h | 2 include/asm-x86/ftrace.h | 14 include/asm-x86/irqflags.h | 24 include/asm-x86/timer.h | 4 include/asm-x86/vsyscall.h | 3 include/linux/ftrace.h | 143 + include/linux/irqflags.h | 13 include/linux/linkage.h | 2 include/linux/mmiotrace.h | 85 include/linux/preempt.h | 34 include/linux/sched.h | 16 include/linux/writeback.h | 2 kernel/Makefile | 14 kernel/fork.c | 2 kernel/lockdep.c | 33 kernel/sched.c | 57 kernel/sysctl.c | 11 kernel/trace/Kconfig | 127 + kernel/trace/Makefile | 22 kernel/trace/ftrace.c | 1703 +++++++++++++++++ kernel/trace/trace.c | 3100 +++++++++++++++++++++++++++++++ kernel/trace/trace.h | 313 +++ kernel/trace/trace_functions.c | 78 kernel/trace/trace_irqsoff.c | 486 ++++ kernel/trace/trace_sched_switch.c | 286 ++ kernel/trace/trace_sched_wakeup.c | 447 ++++ kernel/trace/trace_selftest.c | 540 +++++ kernel/trace/trace_selftest_dynamic.c | 7 lib/Kconfig.debug | 2 lib/Makefile | 9 mm/page-writeback.c | 10 scripts/Makefile.lib | 3 75 files changed, 8760 insertions(+), 83 deletions(-) Index: linux-2.6.26/Makefile =================================================================== --- linux-2.6.26.orig/Makefile +++ linux-2.6.26/Makefile @@ -528,6 +528,10 @@ KBUILD_CFLAGS += -g KBUILD_AFLAGS += -gdwarf-2 endif +ifdef CONFIG_FTRACE +KBUILD_CFLAGS += -pg +endif + # We trigger additional mismatches with less inlining ifdef CONFIG_DEBUG_SECTION_MISMATCH KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) Index: linux-2.6.26/arch/arm/Kconfig =================================================================== --- linux-2.6.26.orig/arch/arm/Kconfig +++ linux-2.6.26/arch/arm/Kconfig @@ -14,6 +14,8 @@ config ARM select HAVE_OPROFILE select HAVE_KPROBES if (!XIP_KERNEL) select HAVE_KRETPROBES if (HAVE_KPROBES) + select HAVE_FTRACE if (!XIP_KERNEL) + select HAVE_DYNAMIC_FTRACE if (HAVE_FTRACE) help The ARM series is a line of low-power-consumption RISC chip designs licensed by ARM Ltd and targeted at embedded applications and Index: linux-2.6.26/arch/arm/boot/compressed/Makefile =================================================================== --- linux-2.6.26.orig/arch/arm/boot/compressed/Makefile +++ linux-2.6.26/arch/arm/boot/compressed/Makefile @@ -69,6 +69,12 @@ SEDFLAGS = s/TEXT_START/$(ZTEXTADDR)/;s/ targets := vmlinux vmlinux.lds piggy.gz piggy.o font.o font.c \ head.o misc.o $(OBJS) + +ifeq ($(CONFIG_FTRACE),y) +ORIG_CFLAGS := $(KBUILD_CFLAGS) +KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS)) +endif + EXTRA_CFLAGS := -fpic -fno-builtin EXTRA_AFLAGS := Index: linux-2.6.26/arch/arm/kernel/Makefile =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/Makefile +++ linux-2.6.26/arch/arm/kernel/Makefile @@ -4,6 +4,10 @@ AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET) +ifdef CONFIG_DYNAMIC_FTRACE +CFLAGS_REMOVE_ftrace.o = -pg +endif + # Object file lists. obj-y := compat.o entry-armv.o entry-common.o irq.o \ @@ -18,6 +22,7 @@ obj-$(CONFIG_ARTHUR) += arthur.o obj-$(CONFIG_ISA_DMA) += dma-isa.o obj-$(CONFIG_PCI) += bios32.o isa.o obj-$(CONFIG_SMP) += smp.o +obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o obj-$(CONFIG_KPROBES) += kprobes.o kprobes-decode.o obj-$(CONFIG_ATAGS_PROC) += atags.o Index: linux-2.6.26/arch/arm/kernel/armksyms.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/armksyms.c +++ linux-2.6.26/arch/arm/kernel/armksyms.c @@ -18,6 +18,7 @@ #include #include #include +#include /* * libgcc functions - functions that are used internally by the @@ -181,3 +182,7 @@ EXPORT_SYMBOL(_find_next_bit_be); #endif EXPORT_SYMBOL(copy_page); + +#ifdef CONFIG_FTRACE +EXPORT_SYMBOL(mcount); +#endif Index: linux-2.6.26/arch/arm/kernel/entry-common.S =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/entry-common.S +++ linux-2.6.26/arch/arm/kernel/entry-common.S @@ -9,6 +9,7 @@ */ #include +#include #include #include "entry-header.S" @@ -99,6 +100,56 @@ ENTRY(ret_from_fork) #undef CALL #define CALL(x) .long x +#ifdef CONFIG_FTRACE +#ifdef CONFIG_DYNAMIC_FTRACE +ENTRY(mcount) + stmdb sp!, {r0-r3, lr} + mov r0, lr + sub r0, r0, #MCOUNT_INSN_SIZE + + .globl mcount_call +mcount_call: + bl ftrace_stub + ldmia sp!, {r0-r3, pc} + +ENTRY(ftrace_caller) + stmdb sp!, {r0-r3, lr} + ldr r1, [fp, #-4] + mov r0, lr + sub r0, r0, #MCOUNT_INSN_SIZE + + .globl ftrace_call +ftrace_call: + bl ftrace_stub + ldmia sp!, {r0-r3, pc} + +#else + +ENTRY(mcount) + stmdb sp!, {r0-r3, lr} + ldr r0, =ftrace_trace_function + ldr r2, [r0] + adr r0, ftrace_stub + cmp r0, r2 + bne trace + ldmia sp!, {r0-r3, pc} + +trace: + ldr r1, [fp, #-4] + mov r0, lr + sub r0, r0, #MCOUNT_INSN_SIZE + mov lr, pc + mov pc, r2 + ldmia sp!, {r0-r3, pc} + +#endif /* CONFIG_DYNAMIC_FTRACE */ + + .globl ftrace_stub +ftrace_stub: + mov pc, lr + +#endif /* CONFIG_FTRACE */ + /*============================================================================= * SWI handler *----------------------------------------------------------------------------- Index: linux-2.6.26/arch/arm/kernel/ftrace.c =================================================================== --- /dev/null +++ linux-2.6.26/arch/arm/kernel/ftrace.c @@ -0,0 +1,116 @@ +/* + * Dynamic function tracing support. + * + * Copyright (C) 2008 Abhishek Sagar + * + * For licencing details, see COPYING. + * + * Defines low-level handling of mcount calls when the kernel + * is compiled with the -pg flag. When using dynamic ftrace, the + * mcount call-sites get patched lazily with NOP till they are + * enabled. All code mutation routines here take effect atomically. + */ + +#include + +#include +#include + +#define PC_OFFSET 8 +#define BL_OPCODE 0xeb000000 +#define BL_OFFSET_MASK 0x00ffffff + +static unsigned long bl_insn; +static const unsigned long NOP = 0xe1a00000; /* mov r0, r0 */ + +unsigned char *ftrace_nop_replace(void) +{ + return (char *)&NOP; +} + +/* construct a branch (BL) instruction to addr */ +unsigned char *ftrace_call_replace(unsigned long pc, unsigned long addr) +{ + long offset; + + offset = (long)addr - (long)(pc + PC_OFFSET); + if (unlikely(offset < -33554432 || offset > 33554428)) { + /* Can't generate branches that far (from ARM ARM). Ftrace + * doesn't generate branches outside of kernel text. + */ + WARN_ON_ONCE(1); + return NULL; + } + offset = (offset >> 2) & BL_OFFSET_MASK; + bl_insn = BL_OPCODE | offset; + return (unsigned char *)&bl_insn; +} + +int ftrace_modify_code(unsigned long pc, unsigned char *old_code, + unsigned char *new_code) +{ + unsigned long err = 0, replaced = 0, old, new; + + old = *(unsigned long *)old_code; + new = *(unsigned long *)new_code; + + __asm__ __volatile__ ( + "1: ldr %1, [%2] \n" + " cmp %1, %4 \n" + "2: streq %3, [%2] \n" + " cmpne %1, %3 \n" + " movne %0, #2 \n" + "3:\n" + + ".section .fixup, \"ax\"\n" + "4: mov %0, #1 \n" + " b 3b \n" + ".previous\n" + + ".section __ex_table, \"a\"\n" + " .long 1b, 4b \n" + " .long 2b, 4b \n" + ".previous\n" + + : "=r"(err), "=r"(replaced) + : "r"(pc), "r"(new), "r"(old), "0"(err), "1"(replaced) + : "memory"); + + if (!err && (replaced == old)) + flush_icache_range(pc, pc + MCOUNT_INSN_SIZE); + + return err; +} + +int ftrace_update_ftrace_func(ftrace_func_t func) +{ + int ret; + unsigned long pc, old; + unsigned char *new; + + pc = (unsigned long)&ftrace_call; + memcpy(&old, &ftrace_call, MCOUNT_INSN_SIZE); + new = ftrace_call_replace(pc, (unsigned long)func); + ret = ftrace_modify_code(pc, (unsigned char *)&old, new); + return ret; +} + +int ftrace_mcount_set(unsigned long *data) +{ + unsigned long pc, old; + unsigned long *addr = data; + unsigned char *new; + + pc = (unsigned long)&mcount_call; + memcpy(&old, &mcount_call, MCOUNT_INSN_SIZE); + new = ftrace_call_replace(pc, *addr); + *addr = ftrace_modify_code(pc, (unsigned char *)&old, new); + return 0; +} + +/* run from kstop_machine */ +int __init ftrace_dyn_arch_init(void *data) +{ + ftrace_mcount_set(data); + return 0; +} Index: linux-2.6.26/arch/powerpc/Kconfig =================================================================== --- linux-2.6.26.orig/arch/powerpc/Kconfig +++ linux-2.6.26/arch/powerpc/Kconfig @@ -105,11 +105,13 @@ config ARCH_NO_VIRT_TO_BUS config PPC bool default y + select HAVE_DYNAMIC_FTRACE + select HAVE_FTRACE select HAVE_IDE - select HAVE_OPROFILE select HAVE_KPROBES select HAVE_KRETPROBES select HAVE_LMB + select HAVE_OPROFILE config EARLY_PRINTK bool Index: linux-2.6.26/arch/powerpc/kernel/Makefile =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/Makefile +++ linux-2.6.26/arch/powerpc/kernel/Makefile @@ -12,6 +12,18 @@ CFLAGS_prom_init.o += -fPIC CFLAGS_btext.o += -fPIC endif +ifdef CONFIG_FTRACE +# Do not trace early boot code +CFLAGS_REMOVE_cputable.o = -pg +CFLAGS_REMOVE_prom_init.o = -pg + +ifdef CONFIG_DYNAMIC_FTRACE +# dynamic ftrace setup. +CFLAGS_REMOVE_ftrace.o = -pg +endif + +endif + obj-y := cputable.o ptrace.o syscalls.o \ irq.o align.o signal_32.o pmc.o vdso.o \ init_task.o process.o systbl.o idle.o \ @@ -78,6 +90,8 @@ obj-$(CONFIG_KEXEC) += machine_kexec.o obj-$(CONFIG_AUDIT) += audit.o obj64-$(CONFIG_AUDIT) += compat_audit.o +obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o + obj-$(CONFIG_8XX_MINIMAL_FPEMU) += softemu8xx.o ifneq ($(CONFIG_PPC_INDIRECT_IO),y) Index: linux-2.6.26/arch/powerpc/kernel/entry_32.S =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/entry_32.S +++ linux-2.6.26/arch/powerpc/kernel/entry_32.S @@ -1,4 +1,4 @@ -/* + /* * PowerPC version * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * Rewritten by Cort Dougan (cort@fsmlabs.com) for PReP @@ -30,6 +30,7 @@ #include #include #include +#include #undef SHOW_SYSCALLS #undef SHOW_SYSCALLS_TASK @@ -1035,3 +1036,129 @@ machine_check_in_rtas: /* XXX load up BATs and panic */ #endif /* CONFIG_PPC_RTAS */ + +#ifdef CONFIG_FTRACE +#ifdef CONFIG_DYNAMIC_FTRACE +_GLOBAL(mcount) +_GLOBAL(_mcount) + stwu r1,-48(r1) + stw r3, 12(r1) + stw r4, 16(r1) + stw r5, 20(r1) + stw r6, 24(r1) + mflr r3 + stw r7, 28(r1) + mfcr r5 + stw r8, 32(r1) + stw r9, 36(r1) + stw r10,40(r1) + stw r3, 44(r1) + stw r5, 8(r1) + subi r3, r3, MCOUNT_INSN_SIZE + .globl mcount_call +mcount_call: + bl ftrace_stub + nop + lwz r6, 8(r1) + lwz r0, 44(r1) + lwz r3, 12(r1) + mtctr r0 + lwz r4, 16(r1) + mtcr r6 + lwz r5, 20(r1) + lwz r6, 24(r1) + lwz r0, 52(r1) + lwz r7, 28(r1) + lwz r8, 32(r1) + mtlr r0 + lwz r9, 36(r1) + lwz r10,40(r1) + addi r1, r1, 48 + bctr + +_GLOBAL(ftrace_caller) + /* Based off of objdump optput from glibc */ + stwu r1,-48(r1) + stw r3, 12(r1) + stw r4, 16(r1) + stw r5, 20(r1) + stw r6, 24(r1) + mflr r3 + lwz r4, 52(r1) + mfcr r5 + stw r7, 28(r1) + stw r8, 32(r1) + stw r9, 36(r1) + stw r10,40(r1) + stw r3, 44(r1) + stw r5, 8(r1) + subi r3, r3, MCOUNT_INSN_SIZE +.globl ftrace_call +ftrace_call: + bl ftrace_stub + nop + lwz r6, 8(r1) + lwz r0, 44(r1) + lwz r3, 12(r1) + mtctr r0 + lwz r4, 16(r1) + mtcr r6 + lwz r5, 20(r1) + lwz r6, 24(r1) + lwz r0, 52(r1) + lwz r7, 28(r1) + lwz r8, 32(r1) + mtlr r0 + lwz r9, 36(r1) + lwz r10,40(r1) + addi r1, r1, 48 + bctr +#else +_GLOBAL(mcount) +_GLOBAL(_mcount) + stwu r1,-48(r1) + stw r3, 12(r1) + stw r4, 16(r1) + stw r5, 20(r1) + stw r6, 24(r1) + mflr r3 + lwz r4, 52(r1) + mfcr r5 + stw r7, 28(r1) + stw r8, 32(r1) + stw r9, 36(r1) + stw r10,40(r1) + stw r3, 44(r1) + stw r5, 8(r1) + + subi r3, r3, MCOUNT_INSN_SIZE + LOAD_REG_ADDR(r5, ftrace_trace_function) + lwz r5,0(r5) + + mtctr r5 + bctrl + + nop + + lwz r6, 8(r1) + lwz r0, 44(r1) + lwz r3, 12(r1) + mtctr r0 + lwz r4, 16(r1) + mtcr r6 + lwz r5, 20(r1) + lwz r6, 24(r1) + lwz r0, 52(r1) + lwz r7, 28(r1) + lwz r8, 32(r1) + mtlr r0 + lwz r9, 36(r1) + lwz r10,40(r1) + addi r1, r1, 48 + bctr +#endif + +_GLOBAL(ftrace_stub) + blr + +#endif /* CONFIG_MCOUNT */ Index: linux-2.6.26/arch/powerpc/kernel/entry_64.S =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/entry_64.S +++ linux-2.6.26/arch/powerpc/kernel/entry_64.S @@ -31,6 +31,7 @@ #include #include #include +#include /* * System calls. @@ -870,3 +871,67 @@ _GLOBAL(enter_prom) ld r0,16(r1) mtlr r0 blr + +#ifdef CONFIG_FTRACE +#ifdef CONFIG_DYNAMIC_FTRACE +_GLOBAL(mcount) +_GLOBAL(_mcount) + /* Taken from output of objdump from lib64/glibc */ + mflr r3 + stdu r1, -112(r1) + std r3, 128(r1) + subi r3, r3, MCOUNT_INSN_SIZE + .globl mcount_call +mcount_call: + bl ftrace_stub + nop + ld r0, 128(r1) + mtlr r0 + addi r1, r1, 112 + blr + +_GLOBAL(ftrace_caller) + /* Taken from output of objdump from lib64/glibc */ + mflr r3 + ld r11, 0(r1) + stdu r1, -112(r1) + std r3, 128(r1) + ld r4, 16(r11) + subi r3, r3, MCOUNT_INSN_SIZE +.globl ftrace_call +ftrace_call: + bl ftrace_stub + nop + ld r0, 128(r1) + mtlr r0 + addi r1, r1, 112 +_GLOBAL(ftrace_stub) + blr +#else +_GLOBAL(mcount) + blr + +_GLOBAL(_mcount) + /* Taken from output of objdump from lib64/glibc */ + mflr r3 + ld r11, 0(r1) + stdu r1, -112(r1) + std r3, 128(r1) + ld r4, 16(r11) + + subi r3, r3, MCOUNT_INSN_SIZE + LOAD_REG_ADDR(r5,ftrace_trace_function) + ld r5,0(r5) + ld r5,0(r5) + mtctr r5 + bctrl + + nop + ld r0, 128(r1) + mtlr r0 + addi r1, r1, 112 +_GLOBAL(ftrace_stub) + blr + +#endif +#endif Index: linux-2.6.26/arch/powerpc/kernel/ftrace.c =================================================================== --- /dev/null +++ linux-2.6.26/arch/powerpc/kernel/ftrace.c @@ -0,0 +1,154 @@ +/* + * Code for replacing ftrace calls with jumps. + * + * Copyright (C) 2007-2008 Steven Rostedt + * + * Thanks goes out to P.A. Semi, Inc for supplying me with a PPC64 box. + * + */ + +#include +#include +#include +#include +#include +#include + +#include +#include + + +static unsigned int ftrace_nop = 0x60000000; + +#ifdef CONFIG_PPC32 +# define GET_ADDR(addr) addr +#else +/* PowerPC64's functions are data that points to the functions */ +# define GET_ADDR(addr) *(unsigned long *)addr +#endif + + +static unsigned int notrace ftrace_calc_offset(long ip, long addr) +{ + return (int)(addr - ip); +} + +notrace unsigned char *ftrace_nop_replace(void) +{ + return (char *)&ftrace_nop; +} + +notrace unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr) +{ + static unsigned int op; + + /* + * It would be nice to just use create_function_call, but that will + * update the code itself. Here we need to just return the + * instruction that is going to be modified, without modifying the + * code. + */ + addr = GET_ADDR(addr); + + /* Set to "bl addr" */ + op = 0x48000001 | (ftrace_calc_offset(ip, addr) & 0x03fffffc); + + /* + * No locking needed, this must be called via kstop_machine + * which in essence is like running on a uniprocessor machine. + */ + return (unsigned char *)&op; +} + +#ifdef CONFIG_PPC64 +# define _ASM_ALIGN " .align 3 " +# define _ASM_PTR " .llong " +#else +# define _ASM_ALIGN " .align 2 " +# define _ASM_PTR " .long " +#endif + +notrace int +ftrace_modify_code(unsigned long ip, unsigned char *old_code, + unsigned char *new_code) +{ + unsigned replaced; + unsigned old = *(unsigned *)old_code; + unsigned new = *(unsigned *)new_code; + int faulted = 0; + + /* + * Note: Due to modules and __init, code can + * disappear and change, we need to protect against faulting + * as well as code changing. + * + * No real locking needed, this code is run through + * kstop_machine. + */ + asm volatile ( + "1: lwz %1, 0(%2)\n" + " cmpw %1, %5\n" + " bne 2f\n" + " stwu %3, 0(%2)\n" + "2:\n" + ".section .fixup, \"ax\"\n" + "3: li %0, 1\n" + " b 2b\n" + ".previous\n" + ".section __ex_table,\"a\"\n" + _ASM_ALIGN "\n" + _ASM_PTR "1b, 3b\n" + ".previous" + : "=r"(faulted), "=r"(replaced) + : "r"(ip), "r"(new), + "0"(faulted), "r"(old) + : "memory"); + + if (replaced != old && replaced != new) + faulted = 2; + + if (!faulted) + flush_icache_range(ip, ip + 8); + + return faulted; +} + +notrace int ftrace_update_ftrace_func(ftrace_func_t func) +{ + unsigned long ip = (unsigned long)(&ftrace_call); + unsigned char old[MCOUNT_INSN_SIZE], *new; + int ret; + + memcpy(old, &ftrace_call, MCOUNT_INSN_SIZE); + new = ftrace_call_replace(ip, (unsigned long)func); + ret = ftrace_modify_code(ip, old, new); + + return ret; +} + +notrace int ftrace_mcount_set(unsigned long *data) +{ + unsigned long ip = (long)(&mcount_call); + unsigned long *addr = data; + unsigned char old[MCOUNT_INSN_SIZE], *new; + + /* + * Replace the mcount stub with a pointer to the + * ip recorder function. + */ + memcpy(old, &mcount_call, MCOUNT_INSN_SIZE); + new = ftrace_call_replace(ip, *addr); + *addr = ftrace_modify_code(ip, old, new); + + return 0; +} + +int __init ftrace_dyn_arch_init(void *data) +{ + /* This is running in kstop_machine */ + + ftrace_mcount_set(data); + + return 0; +} + Index: linux-2.6.26/arch/powerpc/kernel/io.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/io.c +++ linux-2.6.26/arch/powerpc/kernel/io.c @@ -120,7 +120,8 @@ EXPORT_SYMBOL(_outsl_ns); #define IO_CHECK_ALIGN(v,a) ((((unsigned long)(v)) & ((a) - 1)) == 0) -void _memset_io(volatile void __iomem *addr, int c, unsigned long n) +notrace void +_memset_io(volatile void __iomem *addr, int c, unsigned long n) { void *p = (void __force *)addr; u32 lc = c; Index: linux-2.6.26/arch/powerpc/kernel/irq.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/irq.c +++ linux-2.6.26/arch/powerpc/kernel/irq.c @@ -98,7 +98,7 @@ EXPORT_SYMBOL(irq_desc); int distribute_irqs = 1; -static inline unsigned long get_hard_enabled(void) +static inline notrace unsigned long get_hard_enabled(void) { unsigned long enabled; @@ -108,13 +108,13 @@ static inline unsigned long get_hard_ena return enabled; } -static inline void set_soft_enabled(unsigned long enable) +static inline notrace void set_soft_enabled(unsigned long enable) { __asm__ __volatile__("stb %0,%1(13)" : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled))); } -void raw_local_irq_restore(unsigned long en) +notrace void raw_local_irq_restore(unsigned long en) { /* * get_paca()->soft_enabled = en; Index: linux-2.6.26/arch/powerpc/kernel/setup_32.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/setup_32.c +++ linux-2.6.26/arch/powerpc/kernel/setup_32.c @@ -81,7 +81,7 @@ int ucache_bsize; * from the address that it was linked at, so we must use RELOC/PTRRELOC * to access static data (including strings). -- paulus */ -unsigned long __init early_init(unsigned long dt_ptr) +notrace unsigned long __init early_init(unsigned long dt_ptr) { unsigned long offset = reloc_offset(); struct cpu_spec *spec; @@ -111,7 +111,7 @@ unsigned long __init early_init(unsigned * This is called very early on the boot process, after a minimal * MMU environment has been set up but before MMU_init is called. */ -void __init machine_init(unsigned long dt_ptr, unsigned long phys) +notrace void __init machine_init(unsigned long dt_ptr, unsigned long phys) { /* Enable early debugging if any specified (see udbg.h) */ udbg_early_init(); @@ -133,7 +133,7 @@ void __init machine_init(unsigned long d #ifdef CONFIG_BOOKE_WDT /* Checks wdt=x and wdt_period=xx command-line option */ -int __init early_parse_wdt(char *p) +notrace int __init early_parse_wdt(char *p) { if (p && strncmp(p, "0", 1) != 0) booke_wdt_enabled = 1; Index: linux-2.6.26/arch/powerpc/platforms/powermac/Makefile =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/powermac/Makefile +++ linux-2.6.26/arch/powerpc/platforms/powermac/Makefile @@ -1,5 +1,10 @@ CFLAGS_bootx_init.o += -fPIC +ifdef CONFIG_FTRACE +# Do not trace early boot code +CFLAGS_REMOVE_bootx_init.o = -pg +endif + obj-y += pic.o setup.o time.o feature.o pci.o \ sleep.o low_i2c.o cache.o pfunc_core.o \ pfunc_base.o Index: linux-2.6.26/arch/sparc64/Kconfig =================================================================== --- linux-2.6.26.orig/arch/sparc64/Kconfig +++ linux-2.6.26/arch/sparc64/Kconfig @@ -11,6 +11,8 @@ config SPARC config SPARC64 bool default y + select HAVE_DYNAMIC_FTRACE + select HAVE_FTRACE select HAVE_IDE select HAVE_LMB select HAVE_ARCH_KGDB Index: linux-2.6.26/arch/sparc64/Kconfig.debug =================================================================== --- linux-2.6.26.orig/arch/sparc64/Kconfig.debug +++ linux-2.6.26/arch/sparc64/Kconfig.debug @@ -33,7 +33,7 @@ config DEBUG_PAGEALLOC config MCOUNT bool - depends on STACK_DEBUG + depends on STACK_DEBUG || FTRACE default y config FRAME_POINTER Index: linux-2.6.26/arch/sparc64/kernel/Makefile =================================================================== --- linux-2.6.26.orig/arch/sparc64/kernel/Makefile +++ linux-2.6.26/arch/sparc64/kernel/Makefile @@ -14,6 +14,7 @@ obj-y := process.o setup.o cpu.o idprom power.o sbus.o sparc64_ksyms.o chmc.o \ visemul.o prom.o of_device.o hvapi.o sstate.o mdesc.o +obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-$(CONFIG_PCI) += ebus.o pci_common.o \ pci_psycho.o pci_sabre.o pci_schizo.o \ Index: linux-2.6.26/arch/sparc64/kernel/ftrace.c =================================================================== --- /dev/null +++ linux-2.6.26/arch/sparc64/kernel/ftrace.c @@ -0,0 +1,94 @@ +#include +#include +#include +#include +#include +#include + +#include + +static const u32 ftrace_nop = 0x01000000; + +notrace unsigned char *ftrace_nop_replace(void) +{ + return (char *)&ftrace_nop; +} + +notrace unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr) +{ + static u32 call; + s32 off; + + off = ((s32)addr - (s32)ip); + call = 0x40000000 | ((u32)off >> 2); + + return (unsigned char *) &call; +} + +notrace int +ftrace_modify_code(unsigned long ip, unsigned char *old_code, + unsigned char *new_code) +{ + u32 old = *(u32 *)old_code; + u32 new = *(u32 *)new_code; + u32 replaced; + int faulted; + + __asm__ __volatile__( + "1: cas [%[ip]], %[old], %[new]\n" + " flush %[ip]\n" + " mov 0, %[faulted]\n" + "2:\n" + " .section .fixup,#alloc,#execinstr\n" + " .align 4\n" + "3: sethi %%hi(2b), %[faulted]\n" + " jmpl %[faulted] + %%lo(2b), %%g0\n" + " mov 1, %[faulted]\n" + " .previous\n" + " .section __ex_table,\"a\"\n" + " .align 4\n" + " .word 1b, 3b\n" + " .previous\n" + : "=r" (replaced), [faulted] "=r" (faulted) + : [new] "0" (new), [old] "r" (old), [ip] "r" (ip) + : "memory"); + + if (replaced != old && replaced != new) + faulted = 2; + + return faulted; +} + +notrace int ftrace_update_ftrace_func(ftrace_func_t func) +{ + unsigned long ip = (unsigned long)(&ftrace_call); + unsigned char old[MCOUNT_INSN_SIZE], *new; + + memcpy(old, &ftrace_call, MCOUNT_INSN_SIZE); + new = ftrace_call_replace(ip, (unsigned long)func); + return ftrace_modify_code(ip, old, new); +} + +notrace int ftrace_mcount_set(unsigned long *data) +{ + unsigned long ip = (long)(&mcount_call); + unsigned long *addr = data; + unsigned char old[MCOUNT_INSN_SIZE], *new; + + /* + * Replace the mcount stub with a pointer to the + * ip recorder function. + */ + memcpy(old, &mcount_call, MCOUNT_INSN_SIZE); + new = ftrace_call_replace(ip, *addr); + *addr = ftrace_modify_code(ip, old, new); + + return 0; +} + + +int __init ftrace_dyn_arch_init(void *data) +{ + ftrace_mcount_set(data); + return 0; +} Index: linux-2.6.26/arch/sparc64/lib/mcount.S =================================================================== --- linux-2.6.26.orig/arch/sparc64/lib/mcount.S +++ linux-2.6.26/arch/sparc64/lib/mcount.S @@ -28,10 +28,13 @@ ovstack: .skip OVSTACKSIZE #endif .text - .align 32 - .globl mcount, _mcount -mcount: + .align 32 + .globl _mcount + .type _mcount,#function + .globl mcount + .type mcount,#function _mcount: +mcount: #ifdef CONFIG_STACK_DEBUG /* * Check whether %sp is dangerously low. @@ -55,6 +58,53 @@ _mcount: or %g3, %lo(panicstring), %o0 call prom_halt nop +1: +#endif +#ifdef CONFIG_FTRACE +#ifdef CONFIG_DYNAMIC_FTRACE + mov %o7, %o0 + .globl mcount_call +mcount_call: + call ftrace_stub + mov %o0, %o7 +#else + sethi %hi(ftrace_trace_function), %g1 + sethi %hi(ftrace_stub), %g2 + ldx [%g1 + %lo(ftrace_trace_function)], %g1 + or %g2, %lo(ftrace_stub), %g2 + cmp %g1, %g2 + be,pn %icc, 1f + mov %i7, %o1 + jmpl %g1, %g0 + mov %o7, %o0 + /* not reached */ +1: +#endif #endif -1: retl + retl nop + .size _mcount,.-_mcount + .size mcount,.-mcount + +#ifdef CONFIG_FTRACE + .globl ftrace_stub + .type ftrace_stub,#function +ftrace_stub: + retl + nop + .size ftrace_stub,.-ftrace_stub +#ifdef CONFIG_DYNAMIC_FTRACE + .globl ftrace_caller + .type ftrace_caller,#function +ftrace_caller: + mov %i7, %o1 + mov %o7, %o0 + .globl ftrace_call +ftrace_call: + call ftrace_stub + mov %o0, %o7 + retl + nop + .size ftrace_caller,.-ftrace_caller +#endif +#endif Index: linux-2.6.26/arch/x86/Kconfig =================================================================== --- linux-2.6.26.orig/arch/x86/Kconfig +++ linux-2.6.26/arch/x86/Kconfig @@ -23,6 +23,8 @@ config X86 select HAVE_OPROFILE select HAVE_KPROBES select HAVE_KRETPROBES + select HAVE_DYNAMIC_FTRACE + select HAVE_FTRACE select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64) select HAVE_ARCH_KGDB if !X86_VOYAGER Index: linux-2.6.26/arch/x86/kernel/Makefile =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/Makefile +++ linux-2.6.26/arch/x86/kernel/Makefile @@ -6,6 +6,13 @@ extra-y := head_$(BITS).o CPPFLAGS_vmlinux.lds += -U$(UTS_MACHINE) +ifdef CONFIG_FTRACE +# Do not profile debug utilities +CFLAGS_REMOVE_tsc_64.o = -pg +CFLAGS_REMOVE_tsc_32.o = -pg +CFLAGS_REMOVE_rtc.o = -pg +endif + # # vsyscalls (which work on the user stack) should have # no stack-protector checks: @@ -56,6 +63,7 @@ obj-$(CONFIG_X86_MPPARSE) += mpparse.o obj-$(CONFIG_X86_LOCAL_APIC) += apic_$(BITS).o nmi_$(BITS).o obj-$(CONFIG_X86_IO_APIC) += io_apic_$(BITS).o obj-$(CONFIG_X86_REBOOTFIXUPS) += reboot_fixups_32.o +obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o obj-$(CONFIG_KEXEC) += machine_kexec_$(BITS).o obj-$(CONFIG_KEXEC) += relocate_kernel_$(BITS).o crash.o obj-$(CONFIG_CRASH_DUMP) += crash_dump_$(BITS).o Index: linux-2.6.26/arch/x86/kernel/alternative.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/alternative.c +++ linux-2.6.26/arch/x86/kernel/alternative.c @@ -1,6 +1,6 @@ #include #include -#include +#include #include #include #include @@ -143,7 +143,7 @@ static const unsigned char *const p6_nop #ifdef CONFIG_X86_64 extern char __vsyscall_0; -static inline const unsigned char*const * find_nop_table(void) +const unsigned char *const *find_nop_table(void) { return boot_cpu_data.x86_vendor != X86_VENDOR_INTEL || boot_cpu_data.x86 < 6 ? k8_nops : p6_nops; @@ -162,7 +162,7 @@ static const struct nop { { -1, NULL } }; -static const unsigned char*const * find_nop_table(void) +const unsigned char *const *find_nop_table(void) { const unsigned char *const *noptable = intel_nops; int i; @@ -279,7 +279,7 @@ struct smp_alt_module { struct list_head next; }; static LIST_HEAD(smp_alt_modules); -static DEFINE_SPINLOCK(smp_alt); +static DEFINE_MUTEX(smp_alt); static int smp_mode = 1; /* protected by smp_alt */ void alternatives_smp_module_add(struct module *mod, char *name, @@ -312,12 +312,12 @@ void alternatives_smp_module_add(struct __func__, smp->locks, smp->locks_end, smp->text, smp->text_end, smp->name); - spin_lock(&smp_alt); + mutex_lock(&smp_alt); list_add_tail(&smp->next, &smp_alt_modules); if (boot_cpu_has(X86_FEATURE_UP)) alternatives_smp_unlock(smp->locks, smp->locks_end, smp->text, smp->text_end); - spin_unlock(&smp_alt); + mutex_unlock(&smp_alt); } void alternatives_smp_module_del(struct module *mod) @@ -327,17 +327,17 @@ void alternatives_smp_module_del(struct if (smp_alt_once || noreplace_smp) return; - spin_lock(&smp_alt); + mutex_lock(&smp_alt); list_for_each_entry(item, &smp_alt_modules, next) { if (mod != item->mod) continue; list_del(&item->next); - spin_unlock(&smp_alt); + mutex_unlock(&smp_alt); DPRINTK("%s: %s\n", __func__, item->name); kfree(item); return; } - spin_unlock(&smp_alt); + mutex_unlock(&smp_alt); } void alternatives_smp_switch(int smp) @@ -359,7 +359,7 @@ void alternatives_smp_switch(int smp) return; BUG_ON(!smp && (num_online_cpus() > 1)); - spin_lock(&smp_alt); + mutex_lock(&smp_alt); /* * Avoid unnecessary switches because it forces JIT based VMs to @@ -383,7 +383,7 @@ void alternatives_smp_switch(int smp) mod->text, mod->text_end); } smp_mode = smp; - spin_unlock(&smp_alt); + mutex_unlock(&smp_alt); } #endif Index: linux-2.6.26/arch/x86/kernel/entry_32.S =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/entry_32.S +++ linux-2.6.26/arch/x86/kernel/entry_32.S @@ -51,6 +51,7 @@ #include #include #include +#include #include "irq_vectors.h" /* @@ -1110,6 +1111,77 @@ ENDPROC(xen_failsafe_callback) #endif /* CONFIG_XEN */ +#ifdef CONFIG_FTRACE +#ifdef CONFIG_DYNAMIC_FTRACE + +ENTRY(mcount) + pushl %eax + pushl %ecx + pushl %edx + movl 0xc(%esp), %eax + subl $MCOUNT_INSN_SIZE, %eax + +.globl mcount_call +mcount_call: + call ftrace_stub + + popl %edx + popl %ecx + popl %eax + + ret +END(mcount) + +ENTRY(ftrace_caller) + pushl %eax + pushl %ecx + pushl %edx + movl 0xc(%esp), %eax + movl 0x4(%ebp), %edx + subl $MCOUNT_INSN_SIZE, %eax + +.globl ftrace_call +ftrace_call: + call ftrace_stub + + popl %edx + popl %ecx + popl %eax + +.globl ftrace_stub +ftrace_stub: + ret +END(ftrace_caller) + +#else /* ! CONFIG_DYNAMIC_FTRACE */ + +ENTRY(mcount) + cmpl $ftrace_stub, ftrace_trace_function + jnz trace +.globl ftrace_stub +ftrace_stub: + ret + + /* taken from glibc */ +trace: + pushl %eax + pushl %ecx + pushl %edx + movl 0xc(%esp), %eax + movl 0x4(%ebp), %edx + subl $MCOUNT_INSN_SIZE, %eax + + call *ftrace_trace_function + + popl %edx + popl %ecx + popl %eax + + jmp ftrace_stub +END(mcount) +#endif /* CONFIG_DYNAMIC_FTRACE */ +#endif /* CONFIG_FTRACE */ + .section .rodata,"a" #include "syscall_table_32.S" Index: linux-2.6.26/arch/x86/kernel/entry_64.S =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/entry_64.S +++ linux-2.6.26/arch/x86/kernel/entry_64.S @@ -51,9 +51,117 @@ #include #include #include +#include .code64 +#ifdef CONFIG_FTRACE +#ifdef CONFIG_DYNAMIC_FTRACE +ENTRY(mcount) + + subq $0x38, %rsp + movq %rax, (%rsp) + movq %rcx, 8(%rsp) + movq %rdx, 16(%rsp) + movq %rsi, 24(%rsp) + movq %rdi, 32(%rsp) + movq %r8, 40(%rsp) + movq %r9, 48(%rsp) + + movq 0x38(%rsp), %rdi + subq $MCOUNT_INSN_SIZE, %rdi + +.globl mcount_call +mcount_call: + call ftrace_stub + + movq 48(%rsp), %r9 + movq 40(%rsp), %r8 + movq 32(%rsp), %rdi + movq 24(%rsp), %rsi + movq 16(%rsp), %rdx + movq 8(%rsp), %rcx + movq (%rsp), %rax + addq $0x38, %rsp + + retq +END(mcount) + +ENTRY(ftrace_caller) + + /* taken from glibc */ + subq $0x38, %rsp + movq %rax, (%rsp) + movq %rcx, 8(%rsp) + movq %rdx, 16(%rsp) + movq %rsi, 24(%rsp) + movq %rdi, 32(%rsp) + movq %r8, 40(%rsp) + movq %r9, 48(%rsp) + + movq 0x38(%rsp), %rdi + movq 8(%rbp), %rsi + subq $MCOUNT_INSN_SIZE, %rdi + +.globl ftrace_call +ftrace_call: + call ftrace_stub + + movq 48(%rsp), %r9 + movq 40(%rsp), %r8 + movq 32(%rsp), %rdi + movq 24(%rsp), %rsi + movq 16(%rsp), %rdx + movq 8(%rsp), %rcx + movq (%rsp), %rax + addq $0x38, %rsp + +.globl ftrace_stub +ftrace_stub: + retq +END(ftrace_caller) + +#else /* ! CONFIG_DYNAMIC_FTRACE */ +ENTRY(mcount) + cmpq $ftrace_stub, ftrace_trace_function + jnz trace +.globl ftrace_stub +ftrace_stub: + retq + +trace: + /* taken from glibc */ + subq $0x38, %rsp + movq %rax, (%rsp) + movq %rcx, 8(%rsp) + movq %rdx, 16(%rsp) + movq %rsi, 24(%rsp) + movq %rdi, 32(%rsp) + movq %r8, 40(%rsp) + movq %r9, 48(%rsp) + + movq 0x38(%rsp), %rdi + movq 8(%rbp), %rsi + subq $MCOUNT_INSN_SIZE, %rdi + + call *ftrace_trace_function + + movq 48(%rsp), %r9 + movq 40(%rsp), %r8 + movq 32(%rsp), %rdi + movq 24(%rsp), %rsi + movq 16(%rsp), %rdx + movq 8(%rsp), %rcx + movq (%rsp), %rax + addq $0x38, %rsp + + jmp ftrace_stub +END(mcount) +#endif /* CONFIG_DYNAMIC_FTRACE */ +#endif /* CONFIG_FTRACE */ + +#define HARDNMI_MASK 0x40000000 + #ifndef CONFIG_PREEMPT #define retint_kernel retint_restore_args #endif Index: linux-2.6.26/arch/x86/kernel/ftrace.c =================================================================== --- /dev/null +++ linux-2.6.26/arch/x86/kernel/ftrace.c @@ -0,0 +1,141 @@ +/* + * Code for replacing ftrace calls with jumps. + * + * Copyright (C) 2007-2008 Steven Rostedt + * + * Thanks goes to Ingo Molnar, for suggesting the idea. + * Mathieu Desnoyers, for suggesting postponing the modifications. + * Arjan van de Ven, for keeping me straight, and explaining to me + * the dangers of modifying code on the run. + */ + +#include +#include +#include +#include +#include +#include + +#include +#include + + +/* Long is fine, even if it is only 4 bytes ;-) */ +static long *ftrace_nop; + +union ftrace_code_union { + char code[MCOUNT_INSN_SIZE]; + struct { + char e8; + int offset; + } __attribute__((packed)); +}; + + +static int notrace ftrace_calc_offset(long ip, long addr) +{ + return (int)(addr - ip); +} + +notrace unsigned char *ftrace_nop_replace(void) +{ + return (char *)ftrace_nop; +} + +notrace unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr) +{ + static union ftrace_code_union calc; + + calc.e8 = 0xe8; + calc.offset = ftrace_calc_offset(ip + MCOUNT_INSN_SIZE, addr); + + /* + * No locking needed, this must be called via kstop_machine + * which in essence is like running on a uniprocessor machine. + */ + return calc.code; +} + +notrace int +ftrace_modify_code(unsigned long ip, unsigned char *old_code, + unsigned char *new_code) +{ + unsigned replaced; + unsigned old = *(unsigned *)old_code; /* 4 bytes */ + unsigned new = *(unsigned *)new_code; /* 4 bytes */ + unsigned char newch = new_code[4]; + int faulted = 0; + + /* + * Note: Due to modules and __init, code can + * disappear and change, we need to protect against faulting + * as well as code changing. + * + * No real locking needed, this code is run through + * kstop_machine. + */ + asm volatile ( + "1: lock\n" + " cmpxchg %3, (%2)\n" + " jnz 2f\n" + " movb %b4, 4(%2)\n" + "2:\n" + ".section .fixup, \"ax\"\n" + "3: movl $1, %0\n" + " jmp 2b\n" + ".previous\n" + _ASM_EXTABLE(1b, 3b) + : "=r"(faulted), "=a"(replaced) + : "r"(ip), "r"(new), "c"(newch), + "0"(faulted), "a"(old) + : "memory"); + sync_core(); + + if (replaced != old && replaced != new) + faulted = 2; + + return faulted; +} + +notrace int ftrace_update_ftrace_func(ftrace_func_t func) +{ + unsigned long ip = (unsigned long)(&ftrace_call); + unsigned char old[MCOUNT_INSN_SIZE], *new; + int ret; + + memcpy(old, &ftrace_call, MCOUNT_INSN_SIZE); + new = ftrace_call_replace(ip, (unsigned long)func); + ret = ftrace_modify_code(ip, old, new); + + return ret; +} + +notrace int ftrace_mcount_set(unsigned long *data) +{ + unsigned long ip = (long)(&mcount_call); + unsigned long *addr = data; + unsigned char old[MCOUNT_INSN_SIZE], *new; + + /* + * Replace the mcount stub with a pointer to the + * ip recorder function. + */ + memcpy(old, &mcount_call, MCOUNT_INSN_SIZE); + new = ftrace_call_replace(ip, *addr); + *addr = ftrace_modify_code(ip, old, new); + + return 0; +} + +int __init ftrace_dyn_arch_init(void *data) +{ + const unsigned char *const *noptable = find_nop_table(); + + /* This is running in kstop_machine */ + + ftrace_mcount_set(data); + + ftrace_nop = (unsigned long *)noptable[MCOUNT_INSN_SIZE]; + + return 0; +} Index: linux-2.6.26/arch/x86/kernel/i386_ksyms_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/i386_ksyms_32.c +++ linux-2.6.26/arch/x86/kernel/i386_ksyms_32.c @@ -1,7 +1,13 @@ #include #include -#include #include +#include +#include + +#ifdef CONFIG_FTRACE +/* mcount is defined in assembly */ +EXPORT_SYMBOL(mcount); +#endif /* Networking helper routines. */ EXPORT_SYMBOL(csum_partial_copy_generic); Index: linux-2.6.26/arch/x86/kernel/process_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/process_32.c +++ linux-2.6.26/arch/x86/kernel/process_32.c @@ -185,7 +185,10 @@ void cpu_idle(void) local_irq_disable(); __get_cpu_var(irq_stat).idle_timestamp = jiffies; + /* Don't trace irqs off for idle */ + stop_critical_timings(); idle(); + start_critical_timings(); } tick_nohz_restart_sched_tick(); preempt_enable_no_resched(); Index: linux-2.6.26/arch/x86/kernel/process_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/process_64.c +++ linux-2.6.26/arch/x86/kernel/process_64.c @@ -165,7 +165,10 @@ void cpu_idle(void) */ local_irq_disable(); enter_idle(); + /* Don't trace irqs off for idle */ + stop_critical_timings(); idle(); + start_critical_timings(); /* In many cases the interrupt that ended idle has already called exit_idle. But some idle loops can be woken up without interrupt. */ Index: linux-2.6.26/arch/x86/kernel/tsc_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/tsc_32.c +++ linux-2.6.26/arch/x86/kernel/tsc_32.c @@ -111,7 +111,7 @@ static void set_cyc2ns_scale(unsigned lo /* * Scheduler clock - returns current time in nanosec units. */ -unsigned long long native_sched_clock(void) +unsigned long long notrace native_sched_clock(void) { unsigned long long this_offset; Index: linux-2.6.26/arch/x86/kernel/vsyscall_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/vsyscall_64.c +++ linux-2.6.26/arch/x86/kernel/vsyscall_64.c @@ -42,7 +42,8 @@ #include #include -#define __vsyscall(nr) __attribute__ ((unused,__section__(".vsyscall_" #nr))) +#define __vsyscall(nr) \ + __attribute__ ((unused, __section__(".vsyscall_" #nr))) notrace #define __syscall_clobber "r11","cx","memory" /* Index: linux-2.6.26/arch/x86/kernel/x8664_ksyms_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/x8664_ksyms_64.c +++ linux-2.6.26/arch/x86/kernel/x8664_ksyms_64.c @@ -9,6 +9,12 @@ #include #include #include +#include + +#ifdef CONFIG_FTRACE +/* mcount is defined in assembly */ +EXPORT_SYMBOL(mcount); +#endif EXPORT_SYMBOL(kernel_thread); Index: linux-2.6.26/arch/x86/lib/Makefile =================================================================== --- linux-2.6.26.orig/arch/x86/lib/Makefile +++ linux-2.6.26/arch/x86/lib/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_SMP) := msr-on-cpu.o lib-y := delay_$(BITS).o +lib-y += thunk_$(BITS).o lib-y += usercopy_$(BITS).o getuser_$(BITS).o putuser_$(BITS).o lib-y += memcpy_$(BITS).o Index: linux-2.6.26/arch/x86/lib/thunk_32.S =================================================================== --- /dev/null +++ linux-2.6.26/arch/x86/lib/thunk_32.S @@ -0,0 +1,47 @@ +/* + * Trampoline to trace irqs off. (otherwise CALLER_ADDR1 might crash) + * Copyright 2008 by Steven Rostedt, Red Hat, Inc + * (inspired by Andi Kleen's thunk_64.S) + * Subject to the GNU public license, v.2. No warranty of any kind. + */ + + #include + +#define ARCH_TRACE_IRQS_ON \ + pushl %eax; \ + pushl %ecx; \ + pushl %edx; \ + call trace_hardirqs_on; \ + popl %edx; \ + popl %ecx; \ + popl %eax; + +#define ARCH_TRACE_IRQS_OFF \ + pushl %eax; \ + pushl %ecx; \ + pushl %edx; \ + call trace_hardirqs_off; \ + popl %edx; \ + popl %ecx; \ + popl %eax; + +#ifdef CONFIG_TRACE_IRQFLAGS + /* put return address in eax (arg1) */ + .macro thunk_ra name,func + .globl \name +\name: + pushl %eax + pushl %ecx + pushl %edx + /* Place EIP in the arg1 */ + movl 3*4(%esp), %eax + call \func + popl %edx + popl %ecx + popl %eax + ret + .endm + + thunk_ra trace_hardirqs_on_thunk,trace_hardirqs_on_caller + thunk_ra trace_hardirqs_off_thunk,trace_hardirqs_off_caller +#endif Index: linux-2.6.26/arch/x86/lib/thunk_64.S =================================================================== --- linux-2.6.26.orig/arch/x86/lib/thunk_64.S +++ linux-2.6.26/arch/x86/lib/thunk_64.S @@ -2,6 +2,7 @@ * Save registers before calling assembly functions. This avoids * disturbance of register allocation in some inline assembly constructs. * Copyright 2001,2002 by Andi Kleen, SuSE Labs. + * Added trace_hardirqs callers - Copyright 2007 Steven Rostedt, Red Hat, Inc. * Subject to the GNU public license, v.2. No warranty of any kind. */ @@ -42,8 +43,22 @@ #endif #ifdef CONFIG_TRACE_IRQFLAGS - thunk trace_hardirqs_on_thunk,trace_hardirqs_on - thunk trace_hardirqs_off_thunk,trace_hardirqs_off + /* put return address in rdi (arg1) */ + .macro thunk_ra name,func + .globl \name +\name: + CFI_STARTPROC + SAVE_ARGS + /* SAVE_ARGS pushs 9 elements */ + /* the next element would be the rip */ + movq 9*8(%rsp), %rdi + call \func + jmp restore + CFI_ENDPROC + .endm + + thunk_ra trace_hardirqs_on_thunk,trace_hardirqs_on_caller + thunk_ra trace_hardirqs_off_thunk,trace_hardirqs_off_caller #endif #ifdef CONFIG_DEBUG_LOCK_ALLOC Index: linux-2.6.26/arch/x86/mm/init_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/mm/init_32.c +++ linux-2.6.26/arch/x86/mm/init_32.c @@ -710,6 +710,8 @@ void mark_rodata_ro(void) unsigned long start = PFN_ALIGN(_text); unsigned long size = PFN_ALIGN(_etext) - start; +#ifndef CONFIG_DYNAMIC_FTRACE + /* Dynamic tracing modifies the kernel text section */ set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); printk(KERN_INFO "Write protecting the kernel text: %luk\n", size >> 10); @@ -722,6 +724,8 @@ void mark_rodata_ro(void) printk(KERN_INFO "Testing CPA: write protecting again\n"); set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT); #endif +#endif /* CONFIG_DYNAMIC_FTRACE */ + start += size; size = (unsigned long)__end_rodata - start; set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); Index: linux-2.6.26/arch/x86/mm/init_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/mm/init_64.c +++ linux-2.6.26/arch/x86/mm/init_64.c @@ -767,6 +767,13 @@ EXPORT_SYMBOL_GPL(rodata_test_data); void mark_rodata_ro(void) { unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata); + unsigned long rodata_start = + ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; + +#ifdef CONFIG_DYNAMIC_FTRACE + /* Dynamic tracing modifies the kernel text section */ + start = rodata_start; +#endif printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", (end - start) >> 10); @@ -776,8 +783,7 @@ void mark_rodata_ro(void) * The rodata section (but not the kernel text!) should also be * not-executable. */ - start = ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; - set_memory_nx(start, (end - start) >> PAGE_SHIFT); + set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT); rodata_test(); Index: linux-2.6.26/arch/x86/vdso/vclock_gettime.c =================================================================== --- linux-2.6.26.orig/arch/x86/vdso/vclock_gettime.c +++ linux-2.6.26/arch/x86/vdso/vclock_gettime.c @@ -23,7 +23,7 @@ #define gtod vdso_vsyscall_gtod_data -static long vdso_fallback_gettime(long clock, struct timespec *ts) +notrace static long vdso_fallback_gettime(long clock, struct timespec *ts) { long ret; asm("syscall" : "=a" (ret) : @@ -31,7 +31,7 @@ static long vdso_fallback_gettime(long c return ret; } -static inline long vgetns(void) +notrace static inline long vgetns(void) { long v; cycles_t (*vread)(void); @@ -40,7 +40,7 @@ static inline long vgetns(void) return (v * gtod->clock.mult) >> gtod->clock.shift; } -static noinline int do_realtime(struct timespec *ts) +notrace static noinline int do_realtime(struct timespec *ts) { unsigned long seq, ns; do { @@ -54,7 +54,8 @@ static noinline int do_realtime(struct t } /* Copy of the version in kernel/time.c which we cannot directly access */ -static void vset_normalized_timespec(struct timespec *ts, long sec, long nsec) +notrace static void +vset_normalized_timespec(struct timespec *ts, long sec, long nsec) { while (nsec >= NSEC_PER_SEC) { nsec -= NSEC_PER_SEC; @@ -68,7 +69,7 @@ static void vset_normalized_timespec(str ts->tv_nsec = nsec; } -static noinline int do_monotonic(struct timespec *ts) +notrace static noinline int do_monotonic(struct timespec *ts) { unsigned long seq, ns, secs; do { @@ -82,7 +83,7 @@ static noinline int do_monotonic(struct return 0; } -int __vdso_clock_gettime(clockid_t clock, struct timespec *ts) +notrace int __vdso_clock_gettime(clockid_t clock, struct timespec *ts) { if (likely(gtod->sysctl_enabled && gtod->clock.vread)) switch (clock) { @@ -96,7 +97,7 @@ int __vdso_clock_gettime(clockid_t clock int clock_gettime(clockid_t, struct timespec *) __attribute__((weak, alias("__vdso_clock_gettime"))); -int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz) +notrace int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz) { long ret; if (likely(gtod->sysctl_enabled && gtod->clock.vread)) { Index: linux-2.6.26/arch/x86/vdso/vgetcpu.c =================================================================== --- linux-2.6.26.orig/arch/x86/vdso/vgetcpu.c +++ linux-2.6.26/arch/x86/vdso/vgetcpu.c @@ -13,7 +13,8 @@ #include #include "vextern.h" -long __vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) +notrace long +__vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) { unsigned int p; Index: linux-2.6.26/include/asm-arm/ftrace.h =================================================================== --- /dev/null +++ linux-2.6.26/include/asm-arm/ftrace.h @@ -0,0 +1,14 @@ +#ifndef _ASM_ARM_FTRACE +#define _ASM_ARM_FTRACE + +#ifdef CONFIG_FTRACE +#define MCOUNT_ADDR ((long)(mcount)) +#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */ + +#ifndef __ASSEMBLY__ +extern void mcount(void); +#endif + +#endif + +#endif /* _ASM_ARM_FTRACE */ Index: linux-2.6.26/include/asm-powerpc/ftrace.h =================================================================== --- /dev/null +++ linux-2.6.26/include/asm-powerpc/ftrace.h @@ -0,0 +1,14 @@ +#ifndef _ASM_POWERPC_FTRACE +#define _ASM_POWERPC_FTRACE + +#ifdef CONFIG_FTRACE +#define MCOUNT_ADDR ((long)(_mcount)) +#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */ + +#ifndef __ASSEMBLY__ +extern void _mcount(void); +#endif + +#endif + +#endif /* _ASM_POWERPC_FTRACE */ Index: linux-2.6.26/include/asm-sparc64/ftrace.h =================================================================== --- /dev/null +++ linux-2.6.26/include/asm-sparc64/ftrace.h @@ -0,0 +1,14 @@ +#ifndef _ASM_SPARC64_FTRACE +#define _ASM_SPARC64_FTRACE + +#ifdef CONFIG_FTRACE +#define MCOUNT_ADDR ((long)(_mcount)) +#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */ + +#ifndef __ASSEMBLY__ +extern void _mcount(void); +#endif + +#endif + +#endif /* _ASM_SPARC64_FTRACE */ Index: linux-2.6.26/include/asm-x86/alternative.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/alternative.h +++ linux-2.6.26/include/asm-x86/alternative.h @@ -72,6 +72,8 @@ static inline void alternatives_smp_modu static inline void alternatives_smp_switch(int smp) {} #endif /* CONFIG_SMP */ +const unsigned char *const *find_nop_table(void); + /* * Alternative instructions for different CPU types or capabilities. * Index: linux-2.6.26/include/asm-x86/ftrace.h =================================================================== --- /dev/null +++ linux-2.6.26/include/asm-x86/ftrace.h @@ -0,0 +1,14 @@ +#ifndef _ASM_X86_FTRACE +#define _ASM_SPARC64_FTRACE + +#ifdef CONFIG_FTRACE +#define MCOUNT_ADDR ((long)(mcount)) +#define MCOUNT_INSN_SIZE 5 /* sizeof mcount call */ + +#ifndef __ASSEMBLY__ +extern void mcount(void); +#endif + +#endif /* CONFIG_FTRACE */ + +#endif /* _ASM_X86_FTRACE */ Index: linux-2.6.26/include/asm-x86/irqflags.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/irqflags.h +++ linux-2.6.26/include/asm-x86/irqflags.h @@ -179,8 +179,6 @@ static inline void trace_hardirqs_fixup( * have a reliable stack. x86_64 only. */ #define SWAPGS_UNSAFE_STACK swapgs -#define ARCH_TRACE_IRQS_ON call trace_hardirqs_on_thunk -#define ARCH_TRACE_IRQS_OFF call trace_hardirqs_off_thunk #define ARCH_LOCKDEP_SYS_EXIT call lockdep_sys_exit_thunk #define ARCH_LOCKDEP_SYS_EXIT_IRQ \ TRACE_IRQS_ON; \ @@ -192,24 +190,6 @@ static inline void trace_hardirqs_fixup( TRACE_IRQS_OFF; #else -#define ARCH_TRACE_IRQS_ON \ - pushl %eax; \ - pushl %ecx; \ - pushl %edx; \ - call trace_hardirqs_on; \ - popl %edx; \ - popl %ecx; \ - popl %eax; - -#define ARCH_TRACE_IRQS_OFF \ - pushl %eax; \ - pushl %ecx; \ - pushl %edx; \ - call trace_hardirqs_off; \ - popl %edx; \ - popl %ecx; \ - popl %eax; - #define ARCH_LOCKDEP_SYS_EXIT \ pushl %eax; \ pushl %ecx; \ @@ -223,8 +203,8 @@ static inline void trace_hardirqs_fixup( #endif #ifdef CONFIG_TRACE_IRQFLAGS -# define TRACE_IRQS_ON ARCH_TRACE_IRQS_ON -# define TRACE_IRQS_OFF ARCH_TRACE_IRQS_OFF +# define TRACE_IRQS_ON call trace_hardirqs_on_thunk; +# define TRACE_IRQS_OFF call trace_hardirqs_off_thunk; #else # define TRACE_IRQS_ON # define TRACE_IRQS_OFF Index: linux-2.6.26/include/asm-x86/timer.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/timer.h +++ linux-2.6.26/include/asm-x86/timer.h @@ -43,12 +43,12 @@ DECLARE_PER_CPU(unsigned long, cyc2ns); #define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */ -static inline unsigned long long __cycles_2_ns(unsigned long long cyc) +static inline notrace unsigned long long __cycles_2_ns(unsigned long long cyc) { return cyc * per_cpu(cyc2ns, smp_processor_id()) >> CYC2NS_SCALE_FACTOR; } -static inline unsigned long long cycles_2_ns(unsigned long long cyc) +static inline notrace unsigned long long cycles_2_ns(unsigned long long cyc) { unsigned long long ns; unsigned long flags; Index: linux-2.6.26/include/asm-x86/vsyscall.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/vsyscall.h +++ linux-2.6.26/include/asm-x86/vsyscall.h @@ -24,7 +24,8 @@ enum vsyscall_num { ((unused, __section__ (".vsyscall_gtod_data"),aligned(16))) #define __section_vsyscall_clock __attribute__ \ ((unused, __section__ (".vsyscall_clock"),aligned(16))) -#define __vsyscall_fn __attribute__ ((unused,__section__(".vsyscall_fn"))) +#define __vsyscall_fn \ + __attribute__ ((unused, __section__(".vsyscall_fn"))) notrace #define VGETCPU_RDTSCP 1 #define VGETCPU_LSL 2 Index: linux-2.6.26/include/linux/ftrace.h =================================================================== --- /dev/null +++ linux-2.6.26/include/linux/ftrace.h @@ -0,0 +1,143 @@ +#ifndef _LINUX_FTRACE_H +#define _LINUX_FTRACE_H + +#ifdef CONFIG_FTRACE + +#include +#include + +extern int ftrace_enabled; +extern int +ftrace_enable_sysctl(struct ctl_table *table, int write, + struct file *filp, void __user *buffer, size_t *lenp, + loff_t *ppos); + +typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip); + +struct ftrace_ops { + ftrace_func_t func; + struct ftrace_ops *next; +}; + +/* + * The ftrace_ops must be a static and should also + * be read_mostly. These functions do modify read_mostly variables + * so use them sparely. Never free an ftrace_op or modify the + * next pointer after it has been registered. Even after unregistering + * it, the next pointer may still be used internally. + */ +int register_ftrace_function(struct ftrace_ops *ops); +int unregister_ftrace_function(struct ftrace_ops *ops); +void clear_ftrace_function(void); + +extern void ftrace_stub(unsigned long a0, unsigned long a1); + +#else /* !CONFIG_FTRACE */ +# define register_ftrace_function(ops) do { } while (0) +# define unregister_ftrace_function(ops) do { } while (0) +# define clear_ftrace_function(ops) do { } while (0) +#endif /* CONFIG_FTRACE */ + +#ifdef CONFIG_DYNAMIC_FTRACE +# define FTRACE_HASHBITS 10 +# define FTRACE_HASHSIZE (1<hardirq_context) # define trace_softirq_context(p) ((p)->softirq_context) # define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled) @@ -41,6 +41,15 @@ # define INIT_TRACE_IRQFLAGS #endif +#if defined(CONFIG_IRQSOFF_TRACER) || \ + defined(CONFIG_PREEMPT_TRACER) + extern void stop_critical_timings(void); + extern void start_critical_timings(void); +#else +# define stop_critical_timings() do { } while (0) +# define start_critical_timings() do { } while (0) +#endif + #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT #include Index: linux-2.6.26/include/linux/linkage.h =================================================================== --- linux-2.6.26.orig/include/linux/linkage.h +++ linux-2.6.26/include/linux/linkage.h @@ -3,6 +3,8 @@ #include +#define notrace __attribute__((no_instrument_function)) + #ifdef __cplusplus #define CPP_ASMLINKAGE extern "C" #else Index: linux-2.6.26/include/linux/mmiotrace.h =================================================================== --- /dev/null +++ linux-2.6.26/include/linux/mmiotrace.h @@ -0,0 +1,85 @@ +#ifndef MMIOTRACE_H +#define MMIOTRACE_H + +#include +#include + +struct kmmio_probe; +struct pt_regs; + +typedef void (*kmmio_pre_handler_t)(struct kmmio_probe *, + struct pt_regs *, unsigned long addr); +typedef void (*kmmio_post_handler_t)(struct kmmio_probe *, + unsigned long condition, struct pt_regs *); + +struct kmmio_probe { + struct list_head list; /* kmmio internal list */ + unsigned long addr; /* start location of the probe point */ + unsigned long len; /* length of the probe region */ + kmmio_pre_handler_t pre_handler; /* Called before addr is executed. */ + kmmio_post_handler_t post_handler; /* Called after addr is executed */ + void *private; +}; + +/* kmmio is active by some kmmio_probes? */ +static inline int is_kmmio_active(void) +{ + extern unsigned int kmmio_count; + return kmmio_count; +} + +extern int register_kmmio_probe(struct kmmio_probe *p); +extern void unregister_kmmio_probe(struct kmmio_probe *p); + +/* Called from page fault handler. */ +extern int kmmio_handler(struct pt_regs *regs, unsigned long addr); + +/* Called from ioremap.c */ +#ifdef CONFIG_MMIOTRACE +extern void mmiotrace_ioremap(resource_size_t offset, unsigned long size, + void __iomem *addr); +extern void mmiotrace_iounmap(volatile void __iomem *addr); +#else +static inline void mmiotrace_ioremap(resource_size_t offset, + unsigned long size, void __iomem *addr) +{ +} + +static inline void mmiotrace_iounmap(volatile void __iomem *addr) +{ +} +#endif /* CONFIG_MMIOTRACE_HOOKS */ + +enum mm_io_opcode { + MMIO_READ = 0x1, /* struct mmiotrace_rw */ + MMIO_WRITE = 0x2, /* struct mmiotrace_rw */ + MMIO_PROBE = 0x3, /* struct mmiotrace_map */ + MMIO_UNPROBE = 0x4, /* struct mmiotrace_map */ + MMIO_MARKER = 0x5, /* raw char data */ + MMIO_UNKNOWN_OP = 0x6, /* struct mmiotrace_rw */ +}; + +struct mmiotrace_rw { + resource_size_t phys; /* PCI address of register */ + unsigned long value; + unsigned long pc; /* optional program counter */ + int map_id; + unsigned char opcode; /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */ + unsigned char width; /* size of register access in bytes */ +}; + +struct mmiotrace_map { + resource_size_t phys; /* base address in PCI space */ + unsigned long virt; /* base virtual address */ + unsigned long len; /* mapping size */ + int map_id; + unsigned char opcode; /* MMIO_PROBE or MMIO_UNPROBE */ +}; + +/* in kernel/trace/trace_mmiotrace.c */ +extern void enable_mmiotrace(void); +extern void disable_mmiotrace(void); +extern void mmio_trace_rw(struct mmiotrace_rw *rw); +extern void mmio_trace_mapping(struct mmiotrace_map *map); + +#endif /* MMIOTRACE_H */ Index: linux-2.6.26/include/linux/preempt.h =================================================================== --- linux-2.6.26.orig/include/linux/preempt.h +++ linux-2.6.26/include/linux/preempt.h @@ -10,7 +10,7 @@ #include #include -#ifdef CONFIG_DEBUG_PREEMPT +#if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER) extern void add_preempt_count(int val); extern void sub_preempt_count(int val); #else @@ -52,6 +52,34 @@ do { \ preempt_check_resched(); \ } while (0) +/* For debugging and tracer internals only! */ +#define add_preempt_count_notrace(val) \ + do { preempt_count() += (val); } while (0) +#define sub_preempt_count_notrace(val) \ + do { preempt_count() -= (val); } while (0) +#define inc_preempt_count_notrace() add_preempt_count_notrace(1) +#define dec_preempt_count_notrace() sub_preempt_count_notrace(1) + +#define preempt_disable_notrace() \ +do { \ + inc_preempt_count_notrace(); \ + barrier(); \ +} while (0) + +#define preempt_enable_no_resched_notrace() \ +do { \ + barrier(); \ + dec_preempt_count_notrace(); \ +} while (0) + +/* preempt_check_resched is OK to trace */ +#define preempt_enable_notrace() \ +do { \ + preempt_enable_no_resched_notrace(); \ + barrier(); \ + preempt_check_resched(); \ +} while (0) + #else #define preempt_disable() do { } while (0) @@ -59,6 +87,10 @@ do { \ #define preempt_enable() do { } while (0) #define preempt_check_resched() do { } while (0) +#define preempt_disable_notrace() do { } while (0) +#define preempt_enable_no_resched_notrace() do { } while (0) +#define preempt_enable_notrace() do { } while (0) + #endif #ifdef CONFIG_PREEMPT_NOTIFIERS Index: linux-2.6.26/include/linux/sched.h =================================================================== --- linux-2.6.26.orig/include/linux/sched.h +++ linux-2.6.26/include/linux/sched.h @@ -246,6 +246,8 @@ extern asmlinkage void schedule_tail(str extern void init_idle(struct task_struct *idle, int cpu); extern void init_idle_bootup_task(struct task_struct *idle); +extern int runqueue_is_locked(void); + extern cpumask_t nohz_cpu_mask; #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) extern int select_nohz_load_balancer(int cpu); @@ -2158,6 +2160,18 @@ static inline void arch_pick_mmap_layout } #endif +#ifdef CONFIG_TRACING +extern void +__trace_special(void *__tr, void *__data, + unsigned long arg1, unsigned long arg2, unsigned long arg3); +#else +static inline void +__trace_special(void *__tr, void *__data, + unsigned long arg1, unsigned long arg2, unsigned long arg3) +{ +} +#endif + extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask); extern long sched_getaffinity(pid_t pid, cpumask_t *mask); @@ -2252,6 +2266,8 @@ static inline void mm_init_owner(struct } #endif /* CONFIG_MM_OWNER */ +#define TASK_STATE_TO_CHAR_STR "RSDTtZX" + #endif /* __KERNEL__ */ #endif Index: linux-2.6.26/include/linux/writeback.h =================================================================== --- linux-2.6.26.orig/include/linux/writeback.h +++ linux-2.6.26/include/linux/writeback.h @@ -105,6 +105,8 @@ extern int vm_highmem_is_dirtyable; extern int block_dump; extern int laptop_mode; +extern unsigned long determine_dirtyable_memory(void); + extern int dirty_ratio_handler(struct ctl_table *table, int write, struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos); Index: linux-2.6.26/kernel/Makefile =================================================================== --- linux-2.6.26.orig/kernel/Makefile +++ linux-2.6.26/kernel/Makefile @@ -11,6 +11,18 @@ obj-y = sched.o fork.o exec_domain.o hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \ notifier.o ksysfs.o pm_qos_params.o sched_clock.o +CFLAGS_REMOVE_sched.o = -pg -mno-spe + +ifdef CONFIG_FTRACE +# Do not trace debug files and internal ftrace files +CFLAGS_REMOVE_lockdep.o = -pg +CFLAGS_REMOVE_lockdep_proc.o = -pg +CFLAGS_REMOVE_mutex-debug.o = -pg +CFLAGS_REMOVE_rtmutex-debug.o = -pg +CFLAGS_REMOVE_cgroup-debug.o = -pg +CFLAGS_REMOVE_sched_clock.o = -pg +endif + obj-$(CONFIG_SYSCTL_SYSCALL_CHECK) += sysctl_check.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-y += time/ @@ -70,6 +82,8 @@ obj-$(CONFIG_TASK_DELAY_ACCT) += delayac obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o obj-$(CONFIG_MARKERS) += marker.o obj-$(CONFIG_LATENCYTOP) += latencytop.o +obj-$(CONFIG_FTRACE) += trace/ +obj-$(CONFIG_TRACING) += trace/ obj-$(CONFIG_SMP) += sched_cpupri.o ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y) Index: linux-2.6.26/kernel/fork.c =================================================================== --- linux-2.6.26.orig/kernel/fork.c +++ linux-2.6.26/kernel/fork.c @@ -909,7 +909,7 @@ static struct task_struct *copy_process( rt_mutex_init_task(p); -#ifdef CONFIG_TRACE_IRQFLAGS +#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_LOCKDEP) DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled); DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled); #endif Index: linux-2.6.26/kernel/lockdep.c =================================================================== --- linux-2.6.26.orig/kernel/lockdep.c +++ linux-2.6.26/kernel/lockdep.c @@ -39,6 +39,7 @@ #include #include #include +#include #include @@ -81,6 +82,8 @@ static int graph_lock(void) __raw_spin_unlock(&lockdep_lock); return 0; } + /* prevent any recursions within lockdep from causing deadlocks */ + current->lockdep_recursion++; return 1; } @@ -89,6 +92,7 @@ static inline int graph_unlock(void) if (debug_locks && !__raw_spin_is_locked(&lockdep_lock)) return DEBUG_LOCKS_WARN_ON(1); + current->lockdep_recursion--; __raw_spin_unlock(&lockdep_lock); return 0; } @@ -982,7 +986,7 @@ check_noncircular(struct lock_class *sou return 1; } -#ifdef CONFIG_TRACE_IRQFLAGS +#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_PROVE_LOCKING) /* * Forwards and backwards subgraph searching, for the purposes of * proving that two subgraphs can be connected by a new dependency @@ -1680,7 +1684,7 @@ valid_state(struct task_struct *curr, st static int mark_lock(struct task_struct *curr, struct held_lock *this, enum lock_usage_bit new_bit); -#ifdef CONFIG_TRACE_IRQFLAGS +#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_PROVE_LOCKING) /* * print irq inversion bug: @@ -2013,11 +2017,13 @@ void early_boot_irqs_on(void) /* * Hardirqs will be enabled: */ -void trace_hardirqs_on(void) +void trace_hardirqs_on_caller(unsigned long a0) { struct task_struct *curr = current; unsigned long ip; + time_hardirqs_on(CALLER_ADDR0, a0); + if (unlikely(!debug_locks || current->lockdep_recursion)) return; @@ -2055,16 +2061,23 @@ void trace_hardirqs_on(void) curr->hardirq_enable_event = ++curr->irq_events; debug_atomic_inc(&hardirqs_on_events); } +EXPORT_SYMBOL(trace_hardirqs_on_caller); +void trace_hardirqs_on(void) +{ + trace_hardirqs_on_caller(CALLER_ADDR0); +} EXPORT_SYMBOL(trace_hardirqs_on); /* * Hardirqs were disabled: */ -void trace_hardirqs_off(void) +void trace_hardirqs_off_caller(unsigned long a0) { struct task_struct *curr = current; + time_hardirqs_off(CALLER_ADDR0, a0); + if (unlikely(!debug_locks || current->lockdep_recursion)) return; @@ -2082,7 +2095,12 @@ void trace_hardirqs_off(void) } else debug_atomic_inc(&redundant_hardirqs_off); } +EXPORT_SYMBOL(trace_hardirqs_off_caller); +void trace_hardirqs_off(void) +{ + trace_hardirqs_off_caller(CALLER_ADDR0); +} EXPORT_SYMBOL(trace_hardirqs_off); /* @@ -2246,7 +2264,7 @@ static inline int separate_irq_context(s * Mark a lock with a usage bit, and validate the state transition: */ static int mark_lock(struct task_struct *curr, struct held_lock *this, - enum lock_usage_bit new_bit) + enum lock_usage_bit new_bit) { unsigned int new_mask = 1 << new_bit, ret = 1; @@ -2686,7 +2704,7 @@ static void check_flags(unsigned long fl * and also avoid lockdep recursion: */ void lock_acquire(struct lockdep_map *lock, unsigned int subclass, - int trylock, int read, int check, unsigned long ip) + int trylock, int read, int check, unsigned long ip) { unsigned long flags; @@ -2708,7 +2726,8 @@ void lock_acquire(struct lockdep_map *lo EXPORT_SYMBOL_GPL(lock_acquire); -void lock_release(struct lockdep_map *lock, int nested, unsigned long ip) +void lock_release(struct lockdep_map *lock, int nested, + unsigned long ip) { unsigned long flags; Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -70,6 +70,7 @@ #include #include #include +#include #include #include @@ -612,6 +613,24 @@ static inline void update_rq_clock(struc # define const_debug static const #endif +/** + * runqueue_is_locked + * + * Returns true if the current cpu runqueue is locked. + * This interface allows printk to be called with the runqueue lock + * held and know whether or not it is OK to wake up the klogd. + */ +int runqueue_is_locked(void) +{ + int cpu = get_cpu(); + struct rq *rq = cpu_rq(cpu); + int ret; + + ret = spin_is_locked(&rq->lock); + put_cpu(); + return ret; +} + /* * Debugging: various feature bits */ @@ -836,7 +855,7 @@ static unsigned long long __cpu_clock(in * For kernel-internal use: high-speed (but slightly incorrect) per-cpu * clock constructed from sched_clock(): */ -unsigned long long cpu_clock(int cpu) +unsigned long long notrace cpu_clock(int cpu) { unsigned long long prev_cpu_time, time, delta_time; unsigned long flags; @@ -2154,6 +2173,9 @@ out_activate: success = 1; out_running: + trace_mark(kernel_sched_wakeup, + "pid %d state %ld ## rq %p task %p rq->curr %p", + p->pid, p->state, rq, p, rq->curr); check_preempt_curr(rq, p); p->state = TASK_RUNNING; @@ -2284,6 +2306,9 @@ void wake_up_new_task(struct task_struct p->sched_class->task_new(rq, p); inc_nr_running(p, rq); } + trace_mark(kernel_sched_wakeup_new, + "pid %d state %ld ## rq %p task %p rq->curr %p", + p->pid, p->state, rq, p, rq->curr); check_preempt_curr(rq, p); #ifdef CONFIG_SMP if (p->sched_class->task_wake_up) @@ -2456,6 +2481,11 @@ context_switch(struct rq *rq, struct tas struct mm_struct *mm, *oldmm; prepare_task_switch(rq, prev, next); + trace_mark(kernel_sched_schedule, + "prev_pid %d next_pid %d prev_state %ld " + "## rq %p prev %p next %p", + prev->pid, next->pid, prev->state, + rq, prev, next); mm = next->mm; oldmm = prev->active_mm; /* @@ -4026,26 +4056,44 @@ void scheduler_tick(void) #endif } -#if defined(CONFIG_PREEMPT) && defined(CONFIG_DEBUG_PREEMPT) +#if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \ + defined(CONFIG_PREEMPT_TRACER)) + +static inline unsigned long get_parent_ip(unsigned long addr) +{ + if (in_lock_functions(addr)) { + addr = CALLER_ADDR2; + if (in_lock_functions(addr)) + addr = CALLER_ADDR3; + } + return addr; +} void __kprobes add_preempt_count(int val) { +#ifdef CONFIG_DEBUG_PREEMPT /* * Underflow? */ if (DEBUG_LOCKS_WARN_ON((preempt_count() < 0))) return; +#endif preempt_count() += val; +#ifdef CONFIG_DEBUG_PREEMPT /* * Spinlock count overflowing soon? */ DEBUG_LOCKS_WARN_ON((preempt_count() & PREEMPT_MASK) >= PREEMPT_MASK - 10); +#endif + if (preempt_count() == val) + trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1)); } EXPORT_SYMBOL(add_preempt_count); void __kprobes sub_preempt_count(int val) { +#ifdef CONFIG_DEBUG_PREEMPT /* * Underflow? */ @@ -4057,7 +4105,10 @@ void __kprobes sub_preempt_count(int val if (DEBUG_LOCKS_WARN_ON((val < PREEMPT_MASK) && !(preempt_count() & PREEMPT_MASK))) return; +#endif + if (preempt_count() == val) + trace_preempt_on(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1)); preempt_count() -= val; } EXPORT_SYMBOL(sub_preempt_count); @@ -5411,7 +5462,7 @@ out_unlock: return retval; } -static const char stat_nam[] = "RSDTtZX"; +static const char stat_nam[] = TASK_STATE_TO_CHAR_STR; void sched_show_task(struct task_struct *p) { Index: linux-2.6.26/kernel/sysctl.c =================================================================== --- linux-2.6.26.orig/kernel/sysctl.c +++ linux-2.6.26/kernel/sysctl.c @@ -46,6 +46,7 @@ #include #include #include +#include #include #include @@ -455,6 +456,16 @@ static struct ctl_table kern_table[] = { .mode = 0644, .proc_handler = &proc_dointvec, }, +#ifdef CONFIG_FTRACE + { + .ctl_name = CTL_UNNUMBERED, + .procname = "ftrace_enabled", + .data = &ftrace_enabled, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &ftrace_enable_sysctl, + }, +#endif #ifdef CONFIG_KMOD { .ctl_name = KERN_MODPROBE, Index: linux-2.6.26/kernel/trace/Kconfig =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/Kconfig @@ -0,0 +1,127 @@ +# +# Architectures that offer an FTRACE implementation should select HAVE_FTRACE: +# +config HAVE_FTRACE + bool + +config HAVE_DYNAMIC_FTRACE + bool + +config TRACER_MAX_TRACE + bool + +config TRACING + bool + select DEBUG_FS + select STACKTRACE + +config FTRACE + bool "Kernel Function Tracer" + depends on HAVE_FTRACE + select FRAME_POINTER + select TRACING + select CONTEXT_SWITCH_TRACER + help + Enable the kernel to trace every kernel function. This is done + by using a compiler feature to insert a small, 5-byte No-Operation + instruction to the beginning of every kernel function, which NOP + sequence is then dynamically patched into a tracer call when + tracing is enabled by the administrator. If it's runtime disabled + (the bootup default), then the overhead of the instructions is very + small and not measurable even in micro-benchmarks. + +config IRQSOFF_TRACER + bool "Interrupts-off Latency Tracer" + default n + depends on TRACE_IRQFLAGS_SUPPORT + depends on GENERIC_TIME + depends on HAVE_FTRACE + select TRACE_IRQFLAGS + select TRACING + select TRACER_MAX_TRACE + help + This option measures the time spent in irqs-off critical + sections, with microsecond accuracy. + + The default measurement method is a maximum search, which is + disabled by default and can be runtime (re-)started + via: + + echo 0 > /debugfs/tracing/tracing_max_latency + + (Note that kernel size and overhead increases with this option + enabled. This option and the preempt-off timing option can be + used together or separately.) + +config PREEMPT_TRACER + bool "Preemption-off Latency Tracer" + default n + depends on GENERIC_TIME + depends on PREEMPT + depends on HAVE_FTRACE + select TRACING + select TRACER_MAX_TRACE + help + This option measures the time spent in preemption off critical + sections, with microsecond accuracy. + + The default measurement method is a maximum search, which is + disabled by default and can be runtime (re-)started + via: + + echo 0 > /debugfs/tracing/tracing_max_latency + + (Note that kernel size and overhead increases with this option + enabled. This option and the irqs-off timing option can be + used together or separately.) + +config SCHED_TRACER + bool "Scheduling Latency Tracer" + depends on HAVE_FTRACE + select TRACING + select CONTEXT_SWITCH_TRACER + select TRACER_MAX_TRACE + help + This tracer tracks the latency of the highest priority task + to be scheduled in, starting from the point it has woken up. + +config CONTEXT_SWITCH_TRACER + bool "Trace process context switches" + depends on HAVE_FTRACE + select TRACING + select MARKERS + help + This tracer gets called from the context switch and records + all switching of tasks. + +config DYNAMIC_FTRACE + bool "enable/disable ftrace tracepoints dynamically" + depends on FTRACE + depends on HAVE_DYNAMIC_FTRACE + default y + help + This option will modify all the calls to ftrace dynamically + (will patch them out of the binary image and replaces them + with a No-Op instruction) as they are called. A table is + created to dynamically enable them again. + + This way a CONFIG_FTRACE kernel is slightly larger, but otherwise + has native performance as long as no tracing is active. + + The changes to the code are done by a kernel thread that + wakes up once a second and checks to see if any ftrace calls + were made. If so, it runs stop_machine (stops all CPUS) + and modifies the code to jump over the call to ftrace. + +config FTRACE_SELFTEST + bool + +config FTRACE_STARTUP_TEST + bool "Perform a startup test on ftrace" + depends on TRACING + select FTRACE_SELFTEST + help + This option performs a series of startup tests on ftrace. On bootup + a series of tests are made to verify that the tracer is + functioning properly. It will do tests on all the configured + tracers of ftrace. Index: linux-2.6.26/kernel/trace/Makefile =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/Makefile @@ -0,0 +1,22 @@ + +# Do not instrument the tracer itself: + +ifdef CONFIG_FTRACE +ORIG_CFLAGS := $(KBUILD_CFLAGS) +KBUILD_CFLAGS = $(subst -pg,,$(ORIG_CFLAGS)) + +# selftest needs instrumentation +CFLAGS_trace_selftest_dynamic.o = -pg +obj-y += trace_selftest_dynamic.o +endif + +obj-$(CONFIG_FTRACE) += libftrace.o + +obj-$(CONFIG_TRACING) += trace.o +obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o +obj-$(CONFIG_FTRACE) += trace_functions.o +obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o +obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o +obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o + +libftrace-y := ftrace.o Index: linux-2.6.26/kernel/trace/ftrace.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/ftrace.c @@ -0,0 +1,1703 @@ +/* + * Infrastructure for profiling code inserted by 'gcc -pg'. + * + * Copyright (C) 2007-2008 Steven Rostedt + * Copyright (C) 2004-2008 Ingo Molnar + * + * Originally ported from the -rt patch by: + * Copyright (C) 2007 Arnaldo Carvalho de Melo + * + * Based on code in the latency_tracer, that is: + * + * Copyright (C) 2004-2006 Ingo Molnar + * Copyright (C) 2004 William Lee Irwin III + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "trace.h" + +/* ftrace_enabled is a method to turn ftrace on or off */ +int ftrace_enabled __read_mostly; +static int last_ftrace_enabled; + +/* + * ftrace_disabled is set when an anomaly is discovered. + * ftrace_disabled is much stronger than ftrace_enabled. + */ +static int ftrace_disabled __read_mostly; + +static DEFINE_SPINLOCK(ftrace_lock); +static DEFINE_MUTEX(ftrace_sysctl_lock); + +static struct ftrace_ops ftrace_list_end __read_mostly = +{ + .func = ftrace_stub, +}; + +static struct ftrace_ops *ftrace_list __read_mostly = &ftrace_list_end; +ftrace_func_t ftrace_trace_function __read_mostly = ftrace_stub; + +static void ftrace_list_func(unsigned long ip, unsigned long parent_ip) +{ + struct ftrace_ops *op = ftrace_list; + + /* in case someone actually ports this to alpha! */ + read_barrier_depends(); + + while (op != &ftrace_list_end) { + /* silly alpha */ + read_barrier_depends(); + op->func(ip, parent_ip); + op = op->next; + }; +} + +/** + * clear_ftrace_function - reset the ftrace function + * + * This NULLs the ftrace function and in essence stops + * tracing. There may be lag + */ +void clear_ftrace_function(void) +{ + ftrace_trace_function = ftrace_stub; +} + +static int __register_ftrace_function(struct ftrace_ops *ops) +{ + /* Should never be called by interrupts */ + spin_lock(&ftrace_lock); + + ops->next = ftrace_list; + /* + * We are entering ops into the ftrace_list but another + * CPU might be walking that list. We need to make sure + * the ops->next pointer is valid before another CPU sees + * the ops pointer included into the ftrace_list. + */ + smp_wmb(); + ftrace_list = ops; + + if (ftrace_enabled) { + /* + * For one func, simply call it directly. + * For more than one func, call the chain. + */ + if (ops->next == &ftrace_list_end) + ftrace_trace_function = ops->func; + else + ftrace_trace_function = ftrace_list_func; + } + + spin_unlock(&ftrace_lock); + + return 0; +} + +static int __unregister_ftrace_function(struct ftrace_ops *ops) +{ + struct ftrace_ops **p; + int ret = 0; + + spin_lock(&ftrace_lock); + + /* + * If we are removing the last function, then simply point + * to the ftrace_stub. + */ + if (ftrace_list == ops && ops->next == &ftrace_list_end) { + ftrace_trace_function = ftrace_stub; + ftrace_list = &ftrace_list_end; + goto out; + } + + for (p = &ftrace_list; *p != &ftrace_list_end; p = &(*p)->next) + if (*p == ops) + break; + + if (*p != ops) { + ret = -1; + goto out; + } + + *p = (*p)->next; + + if (ftrace_enabled) { + /* If we only have one func left, then call that directly */ + if (ftrace_list == &ftrace_list_end || + ftrace_list->next == &ftrace_list_end) + ftrace_trace_function = ftrace_list->func; + } + + out: + spin_unlock(&ftrace_lock); + + return ret; +} + +#ifdef CONFIG_DYNAMIC_FTRACE + +static struct task_struct *ftraced_task; + +enum { + FTRACE_ENABLE_CALLS = (1 << 0), + FTRACE_DISABLE_CALLS = (1 << 1), + FTRACE_UPDATE_TRACE_FUNC = (1 << 2), + FTRACE_ENABLE_MCOUNT = (1 << 3), + FTRACE_DISABLE_MCOUNT = (1 << 4), +}; + +static int ftrace_filtered; +static int tracing_on; +static int frozen_record_count; + +static struct hlist_head ftrace_hash[FTRACE_HASHSIZE]; + +static DEFINE_PER_CPU(int, ftrace_shutdown_disable_cpu); + +static DEFINE_SPINLOCK(ftrace_shutdown_lock); +static DEFINE_MUTEX(ftraced_lock); +static DEFINE_MUTEX(ftrace_regex_lock); + +struct ftrace_page { + struct ftrace_page *next; + unsigned long index; + struct dyn_ftrace records[]; +}; + +#define ENTRIES_PER_PAGE \ + ((PAGE_SIZE - sizeof(struct ftrace_page)) / sizeof(struct dyn_ftrace)) + +/* estimate from running different kernels */ +#define NR_TO_INIT 10000 + +static struct ftrace_page *ftrace_pages_start; +static struct ftrace_page *ftrace_pages; + +static int ftraced_trigger; +static int ftraced_suspend; +static int ftraced_stop; + +static int ftrace_record_suspend; + +static struct dyn_ftrace *ftrace_free_records; + + +#ifdef CONFIG_KPROBES +static inline void freeze_record(struct dyn_ftrace *rec) +{ + if (!(rec->flags & FTRACE_FL_FROZEN)) { + rec->flags |= FTRACE_FL_FROZEN; + frozen_record_count++; + } +} + +static inline void unfreeze_record(struct dyn_ftrace *rec) +{ + if (rec->flags & FTRACE_FL_FROZEN) { + rec->flags &= ~FTRACE_FL_FROZEN; + frozen_record_count--; + } +} + +static inline int record_frozen(struct dyn_ftrace *rec) +{ + return rec->flags & FTRACE_FL_FROZEN; +} +#else +# define freeze_record(rec) ({ 0; }) +# define unfreeze_record(rec) ({ 0; }) +# define record_frozen(rec) ({ 0; }) +#endif /* CONFIG_KPROBES */ + +int skip_trace(unsigned long ip) +{ + unsigned long fl; + struct dyn_ftrace *rec; + struct hlist_node *t; + struct hlist_head *head; + + if (frozen_record_count == 0) + return 0; + + head = &ftrace_hash[hash_long(ip, FTRACE_HASHBITS)]; + hlist_for_each_entry_rcu(rec, t, head, node) { + if (rec->ip == ip) { + if (record_frozen(rec)) { + if (rec->flags & FTRACE_FL_FAILED) + return 1; + + if (!(rec->flags & FTRACE_FL_CONVERTED)) + return 1; + + if (!tracing_on || !ftrace_enabled) + return 1; + + if (ftrace_filtered) { + fl = rec->flags & (FTRACE_FL_FILTER | + FTRACE_FL_NOTRACE); + if (!fl || (fl & FTRACE_FL_NOTRACE)) + return 1; + } + } + break; + } + } + + return 0; +} + +static inline int +ftrace_ip_in_hash(unsigned long ip, unsigned long key) +{ + struct dyn_ftrace *p; + struct hlist_node *t; + int found = 0; + + hlist_for_each_entry_rcu(p, t, &ftrace_hash[key], node) { + if (p->ip == ip) { + found = 1; + break; + } + } + + return found; +} + +static inline void +ftrace_add_hash(struct dyn_ftrace *node, unsigned long key) +{ + hlist_add_head_rcu(&node->node, &ftrace_hash[key]); +} + +/* called from kstop_machine */ +static inline void ftrace_del_hash(struct dyn_ftrace *node) +{ + hlist_del(&node->node); +} + +static void ftrace_free_rec(struct dyn_ftrace *rec) +{ + /* no locking, only called from kstop_machine */ + + rec->ip = (unsigned long)ftrace_free_records; + ftrace_free_records = rec; + rec->flags |= FTRACE_FL_FREE; +} + +static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip) +{ + struct dyn_ftrace *rec; + + /* First check for freed records */ + if (ftrace_free_records) { + rec = ftrace_free_records; + + if (unlikely(!(rec->flags & FTRACE_FL_FREE))) { + WARN_ON_ONCE(1); + ftrace_free_records = NULL; + ftrace_disabled = 1; + ftrace_enabled = 0; + return NULL; + } + + ftrace_free_records = (void *)rec->ip; + memset(rec, 0, sizeof(*rec)); + return rec; + } + + if (ftrace_pages->index == ENTRIES_PER_PAGE) { + if (!ftrace_pages->next) + return NULL; + ftrace_pages = ftrace_pages->next; + } + + return &ftrace_pages->records[ftrace_pages->index++]; +} + +static void +ftrace_record_ip(unsigned long ip) +{ + struct dyn_ftrace *node; + unsigned long flags; + unsigned long key; + int resched; + int atomic; + int cpu; + + if (!ftrace_enabled || ftrace_disabled) + return; + + resched = need_resched(); + preempt_disable_notrace(); + + /* + * We simply need to protect against recursion. + * Use the the raw version of smp_processor_id and not + * __get_cpu_var which can call debug hooks that can + * cause a recursive crash here. + */ + cpu = raw_smp_processor_id(); + per_cpu(ftrace_shutdown_disable_cpu, cpu)++; + if (per_cpu(ftrace_shutdown_disable_cpu, cpu) != 1) + goto out; + + if (unlikely(ftrace_record_suspend)) + goto out; + + key = hash_long(ip, FTRACE_HASHBITS); + + WARN_ON_ONCE(key >= FTRACE_HASHSIZE); + + if (ftrace_ip_in_hash(ip, key)) + goto out; + + atomic = irqs_disabled(); + + spin_lock_irqsave(&ftrace_shutdown_lock, flags); + + /* This ip may have hit the hash before the lock */ + if (ftrace_ip_in_hash(ip, key)) + goto out_unlock; + + node = ftrace_alloc_dyn_node(ip); + if (!node) + goto out_unlock; + + node->ip = ip; + + ftrace_add_hash(node, key); + + ftraced_trigger = 1; + + out_unlock: + spin_unlock_irqrestore(&ftrace_shutdown_lock, flags); + out: + per_cpu(ftrace_shutdown_disable_cpu, cpu)--; + + /* prevent recursion with scheduler */ + if (resched) + preempt_enable_no_resched_notrace(); + else + preempt_enable_notrace(); +} + +#define FTRACE_ADDR ((long)(ftrace_caller)) + +static int +__ftrace_replace_code(struct dyn_ftrace *rec, + unsigned char *old, unsigned char *new, int enable) +{ + unsigned long ip, fl; + + ip = rec->ip; + + if (ftrace_filtered && enable) { + /* + * If filtering is on: + * + * If this record is set to be filtered and + * is enabled then do nothing. + * + * If this record is set to be filtered and + * it is not enabled, enable it. + * + * If this record is not set to be filtered + * and it is not enabled do nothing. + * + * If this record is set not to trace then + * do nothing. + * + * If this record is set not to trace and + * it is enabled then disable it. + * + * If this record is not set to be filtered and + * it is enabled, disable it. + */ + + fl = rec->flags & (FTRACE_FL_FILTER | FTRACE_FL_NOTRACE | + FTRACE_FL_ENABLED); + + if ((fl == (FTRACE_FL_FILTER | FTRACE_FL_ENABLED)) || + (fl == (FTRACE_FL_FILTER | FTRACE_FL_NOTRACE)) || + !fl || (fl == FTRACE_FL_NOTRACE)) + return 0; + + /* + * If it is enabled disable it, + * otherwise enable it! + */ + if (fl & FTRACE_FL_ENABLED) { + /* swap new and old */ + new = old; + old = ftrace_call_replace(ip, FTRACE_ADDR); + rec->flags &= ~FTRACE_FL_ENABLED; + } else { + new = ftrace_call_replace(ip, FTRACE_ADDR); + rec->flags |= FTRACE_FL_ENABLED; + } + } else { + + if (enable) { + /* + * If this record is set not to trace and is + * not enabled, do nothing. + */ + fl = rec->flags & (FTRACE_FL_NOTRACE | FTRACE_FL_ENABLED); + if (fl == FTRACE_FL_NOTRACE) + return 0; + + new = ftrace_call_replace(ip, FTRACE_ADDR); + } else + old = ftrace_call_replace(ip, FTRACE_ADDR); + + if (enable) { + if (rec->flags & FTRACE_FL_ENABLED) + return 0; + rec->flags |= FTRACE_FL_ENABLED; + } else { + if (!(rec->flags & FTRACE_FL_ENABLED)) + return 0; + rec->flags &= ~FTRACE_FL_ENABLED; + } + } + + return ftrace_modify_code(ip, old, new); +} + +static void ftrace_replace_code(int enable) +{ + int i, failed; + unsigned char *new = NULL, *old = NULL; + struct dyn_ftrace *rec; + struct ftrace_page *pg; + + if (enable) + old = ftrace_nop_replace(); + else + new = ftrace_nop_replace(); + + for (pg = ftrace_pages_start; pg; pg = pg->next) { + for (i = 0; i < pg->index; i++) { + rec = &pg->records[i]; + + /* don't modify code that has already faulted */ + if (rec->flags & FTRACE_FL_FAILED) + continue; + + /* ignore updates to this record's mcount site */ + if (get_kprobe((void *)rec->ip)) + continue; + + failed = __ftrace_replace_code(rec, old, new, enable); + if (failed && (rec->flags & FTRACE_FL_CONVERTED)) { + rec->flags |= FTRACE_FL_FAILED; + if ((system_state == SYSTEM_BOOTING) || + !core_kernel_text(rec->ip)) { + ftrace_del_hash(rec); + ftrace_free_rec(rec); + } + } + } + } +} + +static void ftrace_shutdown_replenish(void) +{ + if (ftrace_pages->next) + return; + + /* allocate another page */ + ftrace_pages->next = (void *)get_zeroed_page(GFP_KERNEL); +} + +static int +ftrace_code_disable(struct dyn_ftrace *rec) +{ + unsigned long ip; + unsigned char *nop, *call; + int failed; + + ip = rec->ip; + + nop = ftrace_nop_replace(); + call = ftrace_call_replace(ip, MCOUNT_ADDR); + + failed = ftrace_modify_code(ip, call, nop); + if (failed) { + rec->flags |= FTRACE_FL_FAILED; + return 0; + } + return 1; +} + +static int __ftrace_update_code(void *ignore); + +static int __ftrace_modify_code(void *data) +{ + unsigned long addr; + int *command = data; + + if (*command & FTRACE_ENABLE_CALLS) { + /* + * Update any recorded ips now that we have the + * machine stopped + */ + __ftrace_update_code(NULL); + ftrace_replace_code(1); + tracing_on = 1; + } else if (*command & FTRACE_DISABLE_CALLS) { + ftrace_replace_code(0); + tracing_on = 0; + } + + if (*command & FTRACE_UPDATE_TRACE_FUNC) + ftrace_update_ftrace_func(ftrace_trace_function); + + if (*command & FTRACE_ENABLE_MCOUNT) { + addr = (unsigned long)ftrace_record_ip; + ftrace_mcount_set(&addr); + } else if (*command & FTRACE_DISABLE_MCOUNT) { + addr = (unsigned long)ftrace_stub; + ftrace_mcount_set(&addr); + } + + return 0; +} + +static void ftrace_run_update_code(int command) +{ + stop_machine_run(__ftrace_modify_code, &command, NR_CPUS); +} + +void ftrace_disable_daemon(void) +{ + /* Stop the daemon from calling kstop_machine */ + mutex_lock(&ftraced_lock); + ftraced_stop = 1; + mutex_unlock(&ftraced_lock); + + ftrace_force_update(); +} + +void ftrace_enable_daemon(void) +{ + mutex_lock(&ftraced_lock); + ftraced_stop = 0; + mutex_unlock(&ftraced_lock); + + ftrace_force_update(); +} + +static ftrace_func_t saved_ftrace_func; + +static void ftrace_startup(void) +{ + int command = 0; + + if (unlikely(ftrace_disabled)) + return; + + mutex_lock(&ftraced_lock); + ftraced_suspend++; + if (ftraced_suspend == 1) + command |= FTRACE_ENABLE_CALLS; + + if (saved_ftrace_func != ftrace_trace_function) { + saved_ftrace_func = ftrace_trace_function; + command |= FTRACE_UPDATE_TRACE_FUNC; + } + + if (!command || !ftrace_enabled) + goto out; + + ftrace_run_update_code(command); + out: + mutex_unlock(&ftraced_lock); +} + +static void ftrace_shutdown(void) +{ + int command = 0; + + if (unlikely(ftrace_disabled)) + return; + + mutex_lock(&ftraced_lock); + ftraced_suspend--; + if (!ftraced_suspend) + command |= FTRACE_DISABLE_CALLS; + + if (saved_ftrace_func != ftrace_trace_function) { + saved_ftrace_func = ftrace_trace_function; + command |= FTRACE_UPDATE_TRACE_FUNC; + } + + if (!command || !ftrace_enabled) + goto out; + + ftrace_run_update_code(command); + out: + mutex_unlock(&ftraced_lock); +} + +static void ftrace_startup_sysctl(void) +{ + int command = FTRACE_ENABLE_MCOUNT; + + if (unlikely(ftrace_disabled)) + return; + + mutex_lock(&ftraced_lock); + /* Force update next time */ + saved_ftrace_func = NULL; + /* ftraced_suspend is true if we want ftrace running */ + if (ftraced_suspend) + command |= FTRACE_ENABLE_CALLS; + + ftrace_run_update_code(command); + mutex_unlock(&ftraced_lock); +} + +static void ftrace_shutdown_sysctl(void) +{ + int command = FTRACE_DISABLE_MCOUNT; + + if (unlikely(ftrace_disabled)) + return; + + mutex_lock(&ftraced_lock); + /* ftraced_suspend is true if ftrace is running */ + if (ftraced_suspend) + command |= FTRACE_DISABLE_CALLS; + + ftrace_run_update_code(command); + mutex_unlock(&ftraced_lock); +} + +static cycle_t ftrace_update_time; +static unsigned long ftrace_update_cnt; +unsigned long ftrace_update_tot_cnt; + +static int __ftrace_update_code(void *ignore) +{ + int i, save_ftrace_enabled; + cycle_t start, stop; + struct dyn_ftrace *p; + struct hlist_node *t, *n; + struct hlist_head *head, temp_list; + + /* Don't be recording funcs now */ + ftrace_record_suspend++; + save_ftrace_enabled = ftrace_enabled; + ftrace_enabled = 0; + + start = ftrace_now(raw_smp_processor_id()); + ftrace_update_cnt = 0; + + /* No locks needed, the machine is stopped! */ + for (i = 0; i < FTRACE_HASHSIZE; i++) { + INIT_HLIST_HEAD(&temp_list); + head = &ftrace_hash[i]; + + /* all CPUS are stopped, we are safe to modify code */ + hlist_for_each_entry_safe(p, t, n, head, node) { + /* Skip over failed records which have not been + * freed. */ + if (p->flags & FTRACE_FL_FAILED) + continue; + + /* Unconverted records are always at the head of the + * hash bucket. Once we encounter a converted record, + * simply skip over to the next bucket. Saves ftraced + * some processor cycles (ftrace does its bid for + * global warming :-p ). */ + if (p->flags & (FTRACE_FL_CONVERTED)) + break; + + /* Ignore updates to this record's mcount site. + * Reintroduce this record at the head of this + * bucket to attempt to "convert" it again if + * the kprobe on it is unregistered before the + * next run. */ + if (get_kprobe((void *)p->ip)) { + ftrace_del_hash(p); + INIT_HLIST_NODE(&p->node); + hlist_add_head(&p->node, &temp_list); + continue; + } + + /* convert record (i.e, patch mcount-call with NOP) */ + if (ftrace_code_disable(p)) { + p->flags |= FTRACE_FL_CONVERTED; + ftrace_update_cnt++; + } else { + if ((system_state == SYSTEM_BOOTING) || + !core_kernel_text(p->ip)) { + ftrace_del_hash(p); + ftrace_free_rec(p); + } + } + } + + hlist_for_each_entry_safe(p, t, n, &temp_list, node) { + hlist_del(&p->node); + INIT_HLIST_NODE(&p->node); + hlist_add_head(&p->node, head); + } + } + + stop = ftrace_now(raw_smp_processor_id()); + ftrace_update_time = stop - start; + ftrace_update_tot_cnt += ftrace_update_cnt; + ftraced_trigger = 0; + + ftrace_enabled = save_ftrace_enabled; + ftrace_record_suspend--; + + return 0; +} + +static int ftrace_update_code(void) +{ + if (unlikely(ftrace_disabled) || + !ftrace_enabled || !ftraced_trigger) + return 0; + + stop_machine_run(__ftrace_update_code, NULL, NR_CPUS); + + return 1; +} + +static int ftraced(void *ignore) +{ + unsigned long usecs; + + while (!kthread_should_stop()) { + + set_current_state(TASK_INTERRUPTIBLE); + + /* check once a second */ + schedule_timeout(HZ); + + if (unlikely(ftrace_disabled)) + continue; + + mutex_lock(&ftrace_sysctl_lock); + mutex_lock(&ftraced_lock); + if (!ftraced_suspend && !ftraced_stop && + ftrace_update_code()) { + usecs = nsecs_to_usecs(ftrace_update_time); + if (ftrace_update_tot_cnt > 100000) { + ftrace_update_tot_cnt = 0; + pr_info("hm, dftrace overflow: %lu change%s" + " (%lu total) in %lu usec%s\n", + ftrace_update_cnt, + ftrace_update_cnt != 1 ? "s" : "", + ftrace_update_tot_cnt, + usecs, usecs != 1 ? "s" : ""); + ftrace_disabled = 1; + WARN_ON_ONCE(1); + } + } + mutex_unlock(&ftraced_lock); + mutex_unlock(&ftrace_sysctl_lock); + + ftrace_shutdown_replenish(); + } + __set_current_state(TASK_RUNNING); + return 0; +} + +static int __init ftrace_dyn_table_alloc(void) +{ + struct ftrace_page *pg; + int cnt; + int i; + + /* allocate a few pages */ + ftrace_pages_start = (void *)get_zeroed_page(GFP_KERNEL); + if (!ftrace_pages_start) + return -1; + + /* + * Allocate a few more pages. + * + * TODO: have some parser search vmlinux before + * final linking to find all calls to ftrace. + * Then we can: + * a) know how many pages to allocate. + * and/or + * b) set up the table then. + * + * The dynamic code is still necessary for + * modules. + */ + + pg = ftrace_pages = ftrace_pages_start; + + cnt = NR_TO_INIT / ENTRIES_PER_PAGE; + + for (i = 0; i < cnt; i++) { + pg->next = (void *)get_zeroed_page(GFP_KERNEL); + + /* If we fail, we'll try later anyway */ + if (!pg->next) + break; + + pg = pg->next; + } + + return 0; +} + +enum { + FTRACE_ITER_FILTER = (1 << 0), + FTRACE_ITER_CONT = (1 << 1), + FTRACE_ITER_NOTRACE = (1 << 2), + FTRACE_ITER_FAILURES = (1 << 3), +}; + +#define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */ + +struct ftrace_iterator { + loff_t pos; + struct ftrace_page *pg; + unsigned idx; + unsigned flags; + unsigned char buffer[FTRACE_BUFF_MAX+1]; + unsigned buffer_idx; + unsigned filtered; +}; + +static void * +t_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct ftrace_iterator *iter = m->private; + struct dyn_ftrace *rec = NULL; + + (*pos)++; + + retry: + if (iter->idx >= iter->pg->index) { + if (iter->pg->next) { + iter->pg = iter->pg->next; + iter->idx = 0; + goto retry; + } + } else { + rec = &iter->pg->records[iter->idx++]; + if ((!(iter->flags & FTRACE_ITER_FAILURES) && + (rec->flags & FTRACE_FL_FAILED)) || + + ((iter->flags & FTRACE_ITER_FAILURES) && + (!(rec->flags & FTRACE_FL_FAILED) || + (rec->flags & FTRACE_FL_FREE))) || + + ((iter->flags & FTRACE_ITER_FILTER) && + !(rec->flags & FTRACE_FL_FILTER)) || + + ((iter->flags & FTRACE_ITER_NOTRACE) && + !(rec->flags & FTRACE_FL_NOTRACE))) { + rec = NULL; + goto retry; + } + } + + iter->pos = *pos; + + return rec; +} + +static void *t_start(struct seq_file *m, loff_t *pos) +{ + struct ftrace_iterator *iter = m->private; + void *p = NULL; + loff_t l = -1; + + if (*pos != iter->pos) { + for (p = t_next(m, p, &l); p && l < *pos; p = t_next(m, p, &l)) + ; + } else { + l = *pos; + p = t_next(m, p, &l); + } + + return p; +} + +static void t_stop(struct seq_file *m, void *p) +{ +} + +static int t_show(struct seq_file *m, void *v) +{ + struct dyn_ftrace *rec = v; + char str[KSYM_SYMBOL_LEN]; + + if (!rec) + return 0; + + kallsyms_lookup(rec->ip, NULL, NULL, NULL, str); + + seq_printf(m, "%s\n", str); + + return 0; +} + +static struct seq_operations show_ftrace_seq_ops = { + .start = t_start, + .next = t_next, + .stop = t_stop, + .show = t_show, +}; + +static int +ftrace_avail_open(struct inode *inode, struct file *file) +{ + struct ftrace_iterator *iter; + int ret; + + if (unlikely(ftrace_disabled)) + return -ENODEV; + + iter = kzalloc(sizeof(*iter), GFP_KERNEL); + if (!iter) + return -ENOMEM; + + iter->pg = ftrace_pages_start; + iter->pos = -1; + + ret = seq_open(file, &show_ftrace_seq_ops); + if (!ret) { + struct seq_file *m = file->private_data; + + m->private = iter; + } else { + kfree(iter); + } + + return ret; +} + +int ftrace_avail_release(struct inode *inode, struct file *file) +{ + struct seq_file *m = (struct seq_file *)file->private_data; + struct ftrace_iterator *iter = m->private; + + seq_release(inode, file); + kfree(iter); + + return 0; +} + +static int +ftrace_failures_open(struct inode *inode, struct file *file) +{ + int ret; + struct seq_file *m; + struct ftrace_iterator *iter; + + ret = ftrace_avail_open(inode, file); + if (!ret) { + m = (struct seq_file *)file->private_data; + iter = (struct ftrace_iterator *)m->private; + iter->flags = FTRACE_ITER_FAILURES; + } + + return ret; +} + + +static void ftrace_filter_reset(int enable) +{ + struct ftrace_page *pg; + struct dyn_ftrace *rec; + unsigned long type = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; + unsigned i; + + /* keep kstop machine from running */ + preempt_disable(); + if (enable) + ftrace_filtered = 0; + pg = ftrace_pages_start; + while (pg) { + for (i = 0; i < pg->index; i++) { + rec = &pg->records[i]; + if (rec->flags & FTRACE_FL_FAILED) + continue; + rec->flags &= ~type; + } + pg = pg->next; + } + preempt_enable(); +} + +static int +ftrace_regex_open(struct inode *inode, struct file *file, int enable) +{ + struct ftrace_iterator *iter; + int ret = 0; + + if (unlikely(ftrace_disabled)) + return -ENODEV; + + iter = kzalloc(sizeof(*iter), GFP_KERNEL); + if (!iter) + return -ENOMEM; + + mutex_lock(&ftrace_regex_lock); + if ((file->f_mode & FMODE_WRITE) && + !(file->f_flags & O_APPEND)) + ftrace_filter_reset(enable); + + if (file->f_mode & FMODE_READ) { + iter->pg = ftrace_pages_start; + iter->pos = -1; + iter->flags = enable ? FTRACE_ITER_FILTER : + FTRACE_ITER_NOTRACE; + + ret = seq_open(file, &show_ftrace_seq_ops); + if (!ret) { + struct seq_file *m = file->private_data; + m->private = iter; + } else + kfree(iter); + } else + file->private_data = iter; + mutex_unlock(&ftrace_regex_lock); + + return ret; +} + +static int +ftrace_filter_open(struct inode *inode, struct file *file) +{ + return ftrace_regex_open(inode, file, 1); +} + +static int +ftrace_notrace_open(struct inode *inode, struct file *file) +{ + return ftrace_regex_open(inode, file, 0); +} + +static ssize_t +ftrace_regex_read(struct file *file, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + if (file->f_mode & FMODE_READ) + return seq_read(file, ubuf, cnt, ppos); + else + return -EPERM; +} + +static loff_t +ftrace_regex_lseek(struct file *file, loff_t offset, int origin) +{ + loff_t ret; + + if (file->f_mode & FMODE_READ) + ret = seq_lseek(file, offset, origin); + else + file->f_pos = ret = 1; + + return ret; +} + +enum { + MATCH_FULL, + MATCH_FRONT_ONLY, + MATCH_MIDDLE_ONLY, + MATCH_END_ONLY, +}; + +static void +ftrace_match(unsigned char *buff, int len, int enable) +{ + char str[KSYM_SYMBOL_LEN]; + char *search = NULL; + struct ftrace_page *pg; + struct dyn_ftrace *rec; + int type = MATCH_FULL; + unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; + unsigned i, match = 0, search_len = 0; + + for (i = 0; i < len; i++) { + if (buff[i] == '*') { + if (!i) { + search = buff + i + 1; + type = MATCH_END_ONLY; + search_len = len - (i + 1); + } else { + if (type == MATCH_END_ONLY) { + type = MATCH_MIDDLE_ONLY; + } else { + match = i; + type = MATCH_FRONT_ONLY; + } + buff[i] = 0; + break; + } + } + } + + /* keep kstop machine from running */ + preempt_disable(); + if (enable) + ftrace_filtered = 1; + pg = ftrace_pages_start; + while (pg) { + for (i = 0; i < pg->index; i++) { + int matched = 0; + char *ptr; + + rec = &pg->records[i]; + if (rec->flags & FTRACE_FL_FAILED) + continue; + kallsyms_lookup(rec->ip, NULL, NULL, NULL, str); + switch (type) { + case MATCH_FULL: + if (strcmp(str, buff) == 0) + matched = 1; + break; + case MATCH_FRONT_ONLY: + if (memcmp(str, buff, match) == 0) + matched = 1; + break; + case MATCH_MIDDLE_ONLY: + if (strstr(str, search)) + matched = 1; + break; + case MATCH_END_ONLY: + ptr = strstr(str, search); + if (ptr && (ptr[search_len] == 0)) + matched = 1; + break; + } + if (matched) + rec->flags |= flag; + } + pg = pg->next; + } + preempt_enable(); +} + +static ssize_t +ftrace_regex_write(struct file *file, const char __user *ubuf, + size_t cnt, loff_t *ppos, int enable) +{ + struct ftrace_iterator *iter; + char ch; + size_t read = 0; + ssize_t ret; + + if (!cnt || cnt < 0) + return 0; + + mutex_lock(&ftrace_regex_lock); + + if (file->f_mode & FMODE_READ) { + struct seq_file *m = file->private_data; + iter = m->private; + } else + iter = file->private_data; + + if (!*ppos) { + iter->flags &= ~FTRACE_ITER_CONT; + iter->buffer_idx = 0; + } + + ret = get_user(ch, ubuf++); + if (ret) + goto out; + read++; + cnt--; + + if (!(iter->flags & ~FTRACE_ITER_CONT)) { + /* skip white space */ + while (cnt && isspace(ch)) { + ret = get_user(ch, ubuf++); + if (ret) + goto out; + read++; + cnt--; + } + + if (isspace(ch)) { + file->f_pos += read; + ret = read; + goto out; + } + + iter->buffer_idx = 0; + } + + while (cnt && !isspace(ch)) { + if (iter->buffer_idx < FTRACE_BUFF_MAX) + iter->buffer[iter->buffer_idx++] = ch; + else { + ret = -EINVAL; + goto out; + } + ret = get_user(ch, ubuf++); + if (ret) + goto out; + read++; + cnt--; + } + + if (isspace(ch)) { + iter->filtered++; + iter->buffer[iter->buffer_idx] = 0; + ftrace_match(iter->buffer, iter->buffer_idx, enable); + iter->buffer_idx = 0; + } else + iter->flags |= FTRACE_ITER_CONT; + + + file->f_pos += read; + + ret = read; + out: + mutex_unlock(&ftrace_regex_lock); + + return ret; +} + +static ssize_t +ftrace_filter_write(struct file *file, const char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + return ftrace_regex_write(file, ubuf, cnt, ppos, 1); +} + +static ssize_t +ftrace_notrace_write(struct file *file, const char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + return ftrace_regex_write(file, ubuf, cnt, ppos, 0); +} + +static void +ftrace_set_regex(unsigned char *buf, int len, int reset, int enable) +{ + if (unlikely(ftrace_disabled)) + return; + + mutex_lock(&ftrace_regex_lock); + if (reset) + ftrace_filter_reset(enable); + if (buf) + ftrace_match(buf, len, enable); + mutex_unlock(&ftrace_regex_lock); +} + +/** + * ftrace_set_filter - set a function to filter on in ftrace + * @buf - the string that holds the function filter text. + * @len - the length of the string. + * @reset - non zero to reset all filters before applying this filter. + * + * Filters denote which functions should be enabled when tracing is enabled. + * If @buf is NULL and reset is set, all functions will be enabled for tracing. + */ +void ftrace_set_filter(unsigned char *buf, int len, int reset) +{ + ftrace_set_regex(buf, len, reset, 1); +} + +/** + * ftrace_set_notrace - set a function to not trace in ftrace + * @buf - the string that holds the function notrace text. + * @len - the length of the string. + * @reset - non zero to reset all filters before applying this filter. + * + * Notrace Filters denote which functions should not be enabled when tracing + * is enabled. If @buf is NULL and reset is set, all functions will be enabled + * for tracing. + */ +void ftrace_set_notrace(unsigned char *buf, int len, int reset) +{ + ftrace_set_regex(buf, len, reset, 0); +} + +static int +ftrace_regex_release(struct inode *inode, struct file *file, int enable) +{ + struct seq_file *m = (struct seq_file *)file->private_data; + struct ftrace_iterator *iter; + + mutex_lock(&ftrace_regex_lock); + if (file->f_mode & FMODE_READ) { + iter = m->private; + + seq_release(inode, file); + } else + iter = file->private_data; + + if (iter->buffer_idx) { + iter->filtered++; + iter->buffer[iter->buffer_idx] = 0; + ftrace_match(iter->buffer, iter->buffer_idx, enable); + } + + mutex_lock(&ftrace_sysctl_lock); + mutex_lock(&ftraced_lock); + if (iter->filtered && ftraced_suspend && ftrace_enabled) + ftrace_run_update_code(FTRACE_ENABLE_CALLS); + mutex_unlock(&ftraced_lock); + mutex_unlock(&ftrace_sysctl_lock); + + kfree(iter); + mutex_unlock(&ftrace_regex_lock); + return 0; +} + +static int +ftrace_filter_release(struct inode *inode, struct file *file) +{ + return ftrace_regex_release(inode, file, 1); +} + +static int +ftrace_notrace_release(struct inode *inode, struct file *file) +{ + return ftrace_regex_release(inode, file, 0); +} + +static ssize_t +ftraced_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + /* don't worry about races */ + char *buf = ftraced_stop ? "disabled\n" : "enabled\n"; + int r = strlen(buf); + + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); +} + +static ssize_t +ftraced_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + char buf[64]; + long val; + int ret; + + if (cnt >= sizeof(buf)) + return -EINVAL; + + if (copy_from_user(&buf, ubuf, cnt)) + return -EFAULT; + + if (strncmp(buf, "enable", 6) == 0) + val = 1; + else if (strncmp(buf, "disable", 7) == 0) + val = 0; + else { + buf[cnt] = 0; + + ret = strict_strtoul(buf, 10, &val); + if (ret < 0) + return ret; + + val = !!val; + } + + if (val) + ftrace_enable_daemon(); + else + ftrace_disable_daemon(); + + filp->f_pos += cnt; + + return cnt; +} + +static struct file_operations ftrace_avail_fops = { + .open = ftrace_avail_open, + .read = seq_read, + .llseek = seq_lseek, + .release = ftrace_avail_release, +}; + +static struct file_operations ftrace_failures_fops = { + .open = ftrace_failures_open, + .read = seq_read, + .llseek = seq_lseek, + .release = ftrace_avail_release, +}; + +static struct file_operations ftrace_filter_fops = { + .open = ftrace_filter_open, + .read = ftrace_regex_read, + .write = ftrace_filter_write, + .llseek = ftrace_regex_lseek, + .release = ftrace_filter_release, +}; + +static struct file_operations ftrace_notrace_fops = { + .open = ftrace_notrace_open, + .read = ftrace_regex_read, + .write = ftrace_notrace_write, + .llseek = ftrace_regex_lseek, + .release = ftrace_notrace_release, +}; + +static struct file_operations ftraced_fops = { + .open = tracing_open_generic, + .read = ftraced_read, + .write = ftraced_write, +}; + +/** + * ftrace_force_update - force an update to all recording ftrace functions + */ +int ftrace_force_update(void) +{ + int ret = 0; + + if (unlikely(ftrace_disabled)) + return -ENODEV; + + mutex_lock(&ftrace_sysctl_lock); + mutex_lock(&ftraced_lock); + + /* + * If ftraced_trigger is not set, then there is nothing + * to update. + */ + if (ftraced_trigger && !ftrace_update_code()) + ret = -EBUSY; + + mutex_unlock(&ftraced_lock); + mutex_unlock(&ftrace_sysctl_lock); + + return ret; +} + +static void ftrace_force_shutdown(void) +{ + struct task_struct *task; + int command = FTRACE_DISABLE_CALLS | FTRACE_UPDATE_TRACE_FUNC; + + mutex_lock(&ftraced_lock); + task = ftraced_task; + ftraced_task = NULL; + ftraced_suspend = -1; + ftrace_run_update_code(command); + mutex_unlock(&ftraced_lock); + + if (task) + kthread_stop(task); +} + +static __init int ftrace_init_debugfs(void) +{ + struct dentry *d_tracer; + struct dentry *entry; + + d_tracer = tracing_init_dentry(); + + entry = debugfs_create_file("available_filter_functions", 0444, + d_tracer, NULL, &ftrace_avail_fops); + if (!entry) + pr_warning("Could not create debugfs " + "'available_filter_functions' entry\n"); + + entry = debugfs_create_file("failures", 0444, + d_tracer, NULL, &ftrace_failures_fops); + if (!entry) + pr_warning("Could not create debugfs 'failures' entry\n"); + + entry = debugfs_create_file("set_ftrace_filter", 0644, d_tracer, + NULL, &ftrace_filter_fops); + if (!entry) + pr_warning("Could not create debugfs " + "'set_ftrace_filter' entry\n"); + + entry = debugfs_create_file("set_ftrace_notrace", 0644, d_tracer, + NULL, &ftrace_notrace_fops); + if (!entry) + pr_warning("Could not create debugfs " + "'set_ftrace_notrace' entry\n"); + + entry = debugfs_create_file("ftraced_enabled", 0644, d_tracer, + NULL, &ftraced_fops); + if (!entry) + pr_warning("Could not create debugfs " + "'ftraced_enabled' entry\n"); + return 0; +} + +fs_initcall(ftrace_init_debugfs); + +static int __init ftrace_dynamic_init(void) +{ + struct task_struct *p; + unsigned long addr; + int ret; + + addr = (unsigned long)ftrace_record_ip; + + stop_machine_run(ftrace_dyn_arch_init, &addr, NR_CPUS); + + /* ftrace_dyn_arch_init places the return code in addr */ + if (addr) { + ret = (int)addr; + goto failed; + } + + ret = ftrace_dyn_table_alloc(); + if (ret) + goto failed; + + p = kthread_run(ftraced, NULL, "ftraced"); + if (IS_ERR(p)) { + ret = -1; + goto failed; + } + + last_ftrace_enabled = ftrace_enabled = 1; + ftraced_task = p; + + return 0; + + failed: + ftrace_disabled = 1; + return ret; +} + +core_initcall(ftrace_dynamic_init); +#else +# define ftrace_startup() do { } while (0) +# define ftrace_shutdown() do { } while (0) +# define ftrace_startup_sysctl() do { } while (0) +# define ftrace_shutdown_sysctl() do { } while (0) +# define ftrace_force_shutdown() do { } while (0) +#endif /* CONFIG_DYNAMIC_FTRACE */ + +/** + * ftrace_kill - totally shutdown ftrace + * + * This is a safety measure. If something was detected that seems + * wrong, calling this function will keep ftrace from doing + * any more modifications, and updates. + * used when something went wrong. + */ +void ftrace_kill(void) +{ + mutex_lock(&ftrace_sysctl_lock); + ftrace_disabled = 1; + ftrace_enabled = 0; + + clear_ftrace_function(); + mutex_unlock(&ftrace_sysctl_lock); + + /* Try to totally disable ftrace */ + ftrace_force_shutdown(); +} + +/** + * register_ftrace_function - register a function for profiling + * @ops - ops structure that holds the function for profiling. + * + * Register a function to be called by all functions in the + * kernel. + * + * Note: @ops->func and all the functions it calls must be labeled + * with "notrace", otherwise it will go into a + * recursive loop. + */ +int register_ftrace_function(struct ftrace_ops *ops) +{ + int ret; + + if (unlikely(ftrace_disabled)) + return -1; + + mutex_lock(&ftrace_sysctl_lock); + ret = __register_ftrace_function(ops); + ftrace_startup(); + mutex_unlock(&ftrace_sysctl_lock); + + return ret; +} + +/** + * unregister_ftrace_function - unresgister a function for profiling. + * @ops - ops structure that holds the function to unregister + * + * Unregister a function that was added to be called by ftrace profiling. + */ +int unregister_ftrace_function(struct ftrace_ops *ops) +{ + int ret; + + mutex_lock(&ftrace_sysctl_lock); + ret = __unregister_ftrace_function(ops); + ftrace_shutdown(); + mutex_unlock(&ftrace_sysctl_lock); + + return ret; +} + +int +ftrace_enable_sysctl(struct ctl_table *table, int write, + struct file *file, void __user *buffer, size_t *lenp, + loff_t *ppos) +{ + int ret; + + if (unlikely(ftrace_disabled)) + return -ENODEV; + + mutex_lock(&ftrace_sysctl_lock); + + ret = proc_dointvec(table, write, file, buffer, lenp, ppos); + + if (ret || !write || (last_ftrace_enabled == ftrace_enabled)) + goto out; + + last_ftrace_enabled = ftrace_enabled; + + if (ftrace_enabled) { + + ftrace_startup_sysctl(); + + /* we are starting ftrace again */ + if (ftrace_list != &ftrace_list_end) { + if (ftrace_list->next == &ftrace_list_end) + ftrace_trace_function = ftrace_list->func; + else + ftrace_trace_function = ftrace_list_func; + } + + } else { + /* stopping ftrace calls (just send to ftrace_stub) */ + ftrace_trace_function = ftrace_stub; + + ftrace_shutdown_sysctl(); + } + + out: + mutex_unlock(&ftrace_sysctl_lock); + return ret; +} Index: linux-2.6.26/kernel/trace/trace.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/trace.c @@ -0,0 +1,3100 @@ +/* + * ring buffer based function tracer + * + * Copyright (C) 2007-2008 Steven Rostedt + * Copyright (C) 2008 Ingo Molnar + * + * Originally taken from the RT patch by: + * Arnaldo Carvalho de Melo + * + * Based on code from the latency_tracer, that is: + * Copyright (C) 2004-2006 Ingo Molnar + * Copyright (C) 2004 William Lee Irwin III + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "trace.h" + +unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; +unsigned long __read_mostly tracing_thresh; + +static unsigned long __read_mostly tracing_nr_buffers; +static cpumask_t __read_mostly tracing_buffer_mask; + +#define for_each_tracing_cpu(cpu) \ + for_each_cpu_mask(cpu, tracing_buffer_mask) + +static int trace_alloc_page(void); +static int trace_free_page(void); + +static int tracing_disabled = 1; + +static unsigned long tracing_pages_allocated; + +long +ns2usecs(cycle_t nsec) +{ + nsec += 500; + do_div(nsec, 1000); + return nsec; +} + +cycle_t ftrace_now(int cpu) +{ + return cpu_clock(cpu); +} + +/* + * The global_trace is the descriptor that holds the tracing + * buffers for the live tracing. For each CPU, it contains + * a link list of pages that will store trace entries. The + * page descriptor of the pages in the memory is used to hold + * the link list by linking the lru item in the page descriptor + * to each of the pages in the buffer per CPU. + * + * For each active CPU there is a data field that holds the + * pages for the buffer for that CPU. Each CPU has the same number + * of pages allocated for its buffer. + */ +static struct trace_array global_trace; + +static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); + +/* + * The max_tr is used to snapshot the global_trace when a maximum + * latency is reached. Some tracers will use this to store a maximum + * trace while it continues examining live traces. + * + * The buffers for the max_tr are set up the same as the global_trace. + * When a snapshot is taken, the link list of the max_tr is swapped + * with the link list of the global_trace and the buffers are reset for + * the global_trace so the tracing can continue. + */ +static struct trace_array max_tr; + +static DEFINE_PER_CPU(struct trace_array_cpu, max_data); + +/* tracer_enabled is used to toggle activation of a tracer */ +static int tracer_enabled = 1; + +/* + * trace_nr_entries is the number of entries that is allocated + * for a buffer. Note, the number of entries is always rounded + * to ENTRIES_PER_PAGE. + */ +static unsigned long trace_nr_entries = 65536UL; + +/* trace_types holds a link list of available tracers. */ +static struct tracer *trace_types __read_mostly; + +/* current_trace points to the tracer that is currently active */ +static struct tracer *current_trace __read_mostly; + +/* + * max_tracer_type_len is used to simplify the allocating of + * buffers to read userspace tracer names. We keep track of + * the longest tracer name registered. + */ +static int max_tracer_type_len; + +/* + * trace_types_lock is used to protect the trace_types list. + * This lock is also used to keep user access serialized. + * Accesses from userspace will grab this lock while userspace + * activities happen inside the kernel. + */ +static DEFINE_MUTEX(trace_types_lock); + +/* trace_wait is a waitqueue for tasks blocked on trace_poll */ +static DECLARE_WAIT_QUEUE_HEAD(trace_wait); + +/* trace_flags holds iter_ctrl options */ +unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; + +static notrace void no_trace_init(struct trace_array *tr) +{ + int cpu; + + if(tr->ctrl) + for_each_online_cpu(cpu) + tracing_reset(tr->data[cpu]); + tracer_enabled = 0; +} + +/* dummy trace to disable tracing */ +static struct tracer no_tracer __read_mostly = { + .name = "none", + .init = no_trace_init +}; + + +/** + * trace_wake_up - wake up tasks waiting for trace input + * + * Simply wakes up any task that is blocked on the trace_wait + * queue. These is used with trace_poll for tasks polling the trace. + */ +void trace_wake_up(void) +{ + /* + * The runqueue_is_locked() can fail, but this is the best we + * have for now: + */ + if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) + wake_up(&trace_wait); +} + +#define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) + +static int __init set_nr_entries(char *str) +{ + unsigned long nr_entries; + int ret; + + if (!str) + return 0; + ret = strict_strtoul(str, 0, &nr_entries); + /* nr_entries can not be zero */ + if (ret < 0 || nr_entries == 0) + return 0; + trace_nr_entries = nr_entries; + return 1; +} +__setup("trace_entries=", set_nr_entries); + +unsigned long nsecs_to_usecs(unsigned long nsecs) +{ + return nsecs / 1000; +} + +/* + * trace_flag_type is an enumeration that holds different + * states when a trace occurs. These are: + * IRQS_OFF - interrupts were disabled + * NEED_RESCED - reschedule is requested + * HARDIRQ - inside an interrupt handler + * SOFTIRQ - inside a softirq handler + */ +enum trace_flag_type { + TRACE_FLAG_IRQS_OFF = 0x01, + TRACE_FLAG_NEED_RESCHED = 0x02, + TRACE_FLAG_HARDIRQ = 0x04, + TRACE_FLAG_SOFTIRQ = 0x08, +}; + +/* + * TRACE_ITER_SYM_MASK masks the options in trace_flags that + * control the output of kernel symbols. + */ +#define TRACE_ITER_SYM_MASK \ + (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) + +/* These must match the bit postions in trace_iterator_flags */ +static const char *trace_options[] = { + "print-parent", + "sym-offset", + "sym-addr", + "verbose", + "raw", + "hex", + "bin", + "block", + "stacktrace", + "sched-tree", + NULL +}; + +/* + * ftrace_max_lock is used to protect the swapping of buffers + * when taking a max snapshot. The buffers themselves are + * protected by per_cpu spinlocks. But the action of the swap + * needs its own lock. + * + * This is defined as a raw_spinlock_t in order to help + * with performance when lockdep debugging is enabled. + */ +static raw_spinlock_t ftrace_max_lock = + (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; + +/* + * Copy the new maximum trace into the separate maximum-trace + * structure. (this way the maximum trace is permanently saved, + * for later retrieval via /debugfs/tracing/latency_trace) + */ +static void +__update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) +{ + struct trace_array_cpu *data = tr->data[cpu]; + + max_tr.cpu = cpu; + max_tr.time_start = data->preempt_timestamp; + + data = max_tr.data[cpu]; + data->saved_latency = tracing_max_latency; + + memcpy(data->comm, tsk->comm, TASK_COMM_LEN); + data->pid = tsk->pid; + data->uid = tsk->uid; + data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; + data->policy = tsk->policy; + data->rt_priority = tsk->rt_priority; + + /* record this tasks comm */ + tracing_record_cmdline(current); +} + +#define CHECK_COND(cond) \ + if (unlikely(cond)) { \ + tracing_disabled = 1; \ + WARN_ON(1); \ + return -1; \ + } + +/** + * check_pages - integrity check of trace buffers + * + * As a safty measure we check to make sure the data pages have not + * been corrupted. + */ +int check_pages(struct trace_array_cpu *data) +{ + struct page *page, *tmp; + + CHECK_COND(data->trace_pages.next->prev != &data->trace_pages); + CHECK_COND(data->trace_pages.prev->next != &data->trace_pages); + + list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { + CHECK_COND(page->lru.next->prev != &page->lru); + CHECK_COND(page->lru.prev->next != &page->lru); + } + + return 0; +} + +/** + * head_page - page address of the first page in per_cpu buffer. + * + * head_page returns the page address of the first page in + * a per_cpu buffer. This also preforms various consistency + * checks to make sure the buffer has not been corrupted. + */ +void *head_page(struct trace_array_cpu *data) +{ + struct page *page; + + if (list_empty(&data->trace_pages)) + return NULL; + + page = list_entry(data->trace_pages.next, struct page, lru); + BUG_ON(&page->lru == &data->trace_pages); + + return page_address(page); +} + +/** + * trace_seq_printf - sequence printing of trace information + * @s: trace sequence descriptor + * @fmt: printf format string + * + * The tracer may use either sequence operations or its own + * copy to user routines. To simplify formating of a trace + * trace_seq_printf is used to store strings into a special + * buffer (@s). Then the output may be either used by + * the sequencer or pulled into another buffer. + */ +int +trace_seq_printf(struct trace_seq *s, const char *fmt, ...) +{ + int len = (PAGE_SIZE - 1) - s->len; + va_list ap; + int ret; + + if (!len) + return 0; + + va_start(ap, fmt); + ret = vsnprintf(s->buffer + s->len, len, fmt, ap); + va_end(ap); + + /* If we can't write it all, don't bother writing anything */ + if (ret >= len) + return 0; + + s->len += ret; + + return len; +} + +/** + * trace_seq_puts - trace sequence printing of simple string + * @s: trace sequence descriptor + * @str: simple string to record + * + * The tracer may use either the sequence operations or its own + * copy to user routines. This function records a simple string + * into a special buffer (@s) for later retrieval by a sequencer + * or other mechanism. + */ +static int +trace_seq_puts(struct trace_seq *s, const char *str) +{ + int len = strlen(str); + + if (len > ((PAGE_SIZE - 1) - s->len)) + return 0; + + memcpy(s->buffer + s->len, str, len); + s->len += len; + + return len; +} + +static int +trace_seq_putc(struct trace_seq *s, unsigned char c) +{ + if (s->len >= (PAGE_SIZE - 1)) + return 0; + + s->buffer[s->len++] = c; + + return 1; +} + +static int +trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) +{ + if (len > ((PAGE_SIZE - 1) - s->len)) + return 0; + + memcpy(s->buffer + s->len, mem, len); + s->len += len; + + return len; +} + +#define HEX_CHARS 17 +static const char hex2asc[] = "0123456789abcdef"; + +static int +trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) +{ + unsigned char hex[HEX_CHARS]; + unsigned char *data = mem; + unsigned char byte; + int i, j; + + BUG_ON(len >= HEX_CHARS); + +#ifdef __BIG_ENDIAN + for (i = 0, j = 0; i < len; i++) { +#else + for (i = len-1, j = 0; i >= 0; i--) { +#endif + byte = data[i]; + + hex[j++] = hex2asc[byte & 0x0f]; + hex[j++] = hex2asc[byte >> 4]; + } + hex[j++] = ' '; + + return trace_seq_putmem(s, hex, j); +} + +static void +trace_seq_reset(struct trace_seq *s) +{ + s->len = 0; + s->readpos = 0; +} + +ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) +{ + int len; + int ret; + + if (s->len <= s->readpos) + return -EBUSY; + + len = s->len - s->readpos; + if (cnt > len) + cnt = len; + ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); + if (ret) + return -EFAULT; + + s->readpos += len; + return cnt; +} + +static void +trace_print_seq(struct seq_file *m, struct trace_seq *s) +{ + int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; + + s->buffer[len] = 0; + seq_puts(m, s->buffer); + + trace_seq_reset(s); +} + +/* + * flip the trace buffers between two trace descriptors. + * This usually is the buffers between the global_trace and + * the max_tr to record a snapshot of a current trace. + * + * The ftrace_max_lock must be held. + */ +static void +flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) +{ + struct list_head flip_pages; + + INIT_LIST_HEAD(&flip_pages); + + memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, + sizeof(struct trace_array_cpu) - + offsetof(struct trace_array_cpu, trace_head_idx)); + + check_pages(tr1); + check_pages(tr2); + list_splice_init(&tr1->trace_pages, &flip_pages); + list_splice_init(&tr2->trace_pages, &tr1->trace_pages); + list_splice_init(&flip_pages, &tr2->trace_pages); + BUG_ON(!list_empty(&flip_pages)); + check_pages(tr1); + check_pages(tr2); +} + +/** + * update_max_tr - snapshot all trace buffers from global_trace to max_tr + * @tr: tracer + * @tsk: the task with the latency + * @cpu: The cpu that initiated the trace. + * + * Flip the buffers between the @tr and the max_tr and record information + * about which task was the cause of this latency. + */ +void +update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) +{ + struct trace_array_cpu *data; + int i; + + WARN_ON_ONCE(!irqs_disabled()); + __raw_spin_lock(&ftrace_max_lock); + /* clear out all the previous traces */ + for_each_tracing_cpu(i) { + data = tr->data[i]; + flip_trace(max_tr.data[i], data); + tracing_reset(data); + } + + __update_max_tr(tr, tsk, cpu); + __raw_spin_unlock(&ftrace_max_lock); +} + +/** + * update_max_tr_single - only copy one trace over, and reset the rest + * @tr - tracer + * @tsk - task with the latency + * @cpu - the cpu of the buffer to copy. + * + * Flip the trace of a single CPU buffer between the @tr and the max_tr. + */ +void +update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) +{ + struct trace_array_cpu *data = tr->data[cpu]; + int i; + + WARN_ON_ONCE(!irqs_disabled()); + __raw_spin_lock(&ftrace_max_lock); + for_each_tracing_cpu(i) + tracing_reset(max_tr.data[i]); + + flip_trace(max_tr.data[cpu], data); + tracing_reset(data); + + __update_max_tr(tr, tsk, cpu); + __raw_spin_unlock(&ftrace_max_lock); +} + +/** + * register_tracer - register a tracer with the ftrace system. + * @type - the plugin for the tracer + * + * Register a new plugin tracer. + */ +int register_tracer(struct tracer *type) +{ + struct tracer *t; + int len; + int ret = 0; + + if (!type->name) { + pr_info("Tracer must have a name\n"); + return -1; + } + + mutex_lock(&trace_types_lock); + for (t = trace_types; t; t = t->next) { + if (strcmp(type->name, t->name) == 0) { + /* already found */ + pr_info("Trace %s already registered\n", + type->name); + ret = -1; + goto out; + } + } + +#ifdef CONFIG_FTRACE_STARTUP_TEST + if (type->selftest) { + struct tracer *saved_tracer = current_trace; + struct trace_array_cpu *data; + struct trace_array *tr = &global_trace; + int saved_ctrl = tr->ctrl; + int i; + /* + * Run a selftest on this tracer. + * Here we reset the trace buffer, and set the current + * tracer to be this tracer. The tracer can then run some + * internal tracing to verify that everything is in order. + * If we fail, we do not register this tracer. + */ + for_each_tracing_cpu(i) { + data = tr->data[i]; + if (!head_page(data)) + continue; + tracing_reset(data); + } + current_trace = type; + tr->ctrl = 0; + /* the test is responsible for initializing and enabling */ + pr_info("Testing tracer %s: ", type->name); + ret = type->selftest(type, tr); + /* the test is responsible for resetting too */ + current_trace = saved_tracer; + tr->ctrl = saved_ctrl; + if (ret) { + printk(KERN_CONT "FAILED!\n"); + goto out; + } + /* Only reset on passing, to avoid touching corrupted buffers */ + for_each_tracing_cpu(i) { + data = tr->data[i]; + if (!head_page(data)) + continue; + tracing_reset(data); + } + printk(KERN_CONT "PASSED\n"); + } +#endif + + type->next = trace_types; + trace_types = type; + len = strlen(type->name); + if (len > max_tracer_type_len) + max_tracer_type_len = len; + + out: + mutex_unlock(&trace_types_lock); + + return ret; +} + +void unregister_tracer(struct tracer *type) +{ + struct tracer **t; + int len; + + mutex_lock(&trace_types_lock); + for (t = &trace_types; *t; t = &(*t)->next) { + if (*t == type) + goto found; + } + pr_info("Trace %s not registered\n", type->name); + goto out; + + found: + *t = (*t)->next; + if (strlen(type->name) != max_tracer_type_len) + goto out; + + max_tracer_type_len = 0; + for (t = &trace_types; *t; t = &(*t)->next) { + len = strlen((*t)->name); + if (len > max_tracer_type_len) + max_tracer_type_len = len; + } + out: + mutex_unlock(&trace_types_lock); +} + +void tracing_reset(struct trace_array_cpu *data) +{ + data->trace_idx = 0; + data->overrun = 0; + data->trace_head = data->trace_tail = head_page(data); + data->trace_head_idx = 0; + data->trace_tail_idx = 0; +} + +#define SAVED_CMDLINES 128 +static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; +static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; +static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; +static int cmdline_idx; +static DEFINE_SPINLOCK(trace_cmdline_lock); + +/* temporary disable recording */ +atomic_t trace_record_cmdline_disabled __read_mostly; + +static void trace_init_cmdlines(void) +{ + memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); + memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); + cmdline_idx = 0; +} + +void trace_stop_cmdline_recording(void); + +static void trace_save_cmdline(struct task_struct *tsk) +{ + unsigned map; + unsigned idx; + + if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) + return; + + /* + * It's not the end of the world if we don't get + * the lock, but we also don't want to spin + * nor do we want to disable interrupts, + * so if we miss here, then better luck next time. + */ + if (!spin_trylock(&trace_cmdline_lock)) + return; + + idx = map_pid_to_cmdline[tsk->pid]; + if (idx >= SAVED_CMDLINES) { + idx = (cmdline_idx + 1) % SAVED_CMDLINES; + + map = map_cmdline_to_pid[idx]; + if (map <= PID_MAX_DEFAULT) + map_pid_to_cmdline[map] = (unsigned)-1; + + map_pid_to_cmdline[tsk->pid] = idx; + + cmdline_idx = idx; + } + + memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); + + spin_unlock(&trace_cmdline_lock); +} + +static char *trace_find_cmdline(int pid) +{ + char *cmdline = "<...>"; + unsigned map; + + if (!pid) + return ""; + + if (pid > PID_MAX_DEFAULT) + goto out; + + map = map_pid_to_cmdline[pid]; + if (map >= SAVED_CMDLINES) + goto out; + + cmdline = saved_cmdlines[map]; + + out: + return cmdline; +} + +void tracing_record_cmdline(struct task_struct *tsk) +{ + if (atomic_read(&trace_record_cmdline_disabled)) + return; + + trace_save_cmdline(tsk); +} + +static inline struct list_head * +trace_next_list(struct trace_array_cpu *data, struct list_head *next) +{ + /* + * Roundrobin - but skip the head (which is not a real page): + */ + next = next->next; + if (unlikely(next == &data->trace_pages)) + next = next->next; + BUG_ON(next == &data->trace_pages); + + return next; +} + +static inline void * +trace_next_page(struct trace_array_cpu *data, void *addr) +{ + struct list_head *next; + struct page *page; + + page = virt_to_page(addr); + + next = trace_next_list(data, &page->lru); + page = list_entry(next, struct page, lru); + + return page_address(page); +} + +static inline struct trace_entry * +tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data) +{ + unsigned long idx, idx_next; + struct trace_entry *entry; + + data->trace_idx++; + idx = data->trace_head_idx; + idx_next = idx + 1; + + BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); + + entry = data->trace_head + idx * TRACE_ENTRY_SIZE; + + if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { + data->trace_head = trace_next_page(data, data->trace_head); + idx_next = 0; + } + + if (data->trace_head == data->trace_tail && + idx_next == data->trace_tail_idx) { + /* overrun */ + data->overrun++; + data->trace_tail_idx++; + if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { + data->trace_tail = + trace_next_page(data, data->trace_tail); + data->trace_tail_idx = 0; + } + } + + data->trace_head_idx = idx_next; + + return entry; +} + +static inline void +tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) +{ + struct task_struct *tsk = current; + unsigned long pc; + + pc = preempt_count(); + + entry->preempt_count = pc & 0xff; + entry->pid = (tsk) ? tsk->pid : 0; + entry->t = ftrace_now(raw_smp_processor_id()); + entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | + ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | + ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | + (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); +} + +void +trace_function(struct trace_array *tr, struct trace_array_cpu *data, + unsigned long ip, unsigned long parent_ip, unsigned long flags) +{ + struct trace_entry *entry; + unsigned long irq_flags; + + raw_local_irq_save(irq_flags); + __raw_spin_lock(&data->lock); + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_FN; + entry->fn.ip = ip; + entry->fn.parent_ip = parent_ip; + __raw_spin_unlock(&data->lock); + raw_local_irq_restore(irq_flags); +} + +void +ftrace(struct trace_array *tr, struct trace_array_cpu *data, + unsigned long ip, unsigned long parent_ip, unsigned long flags) +{ + if (likely(!atomic_read(&data->disabled))) + trace_function(tr, data, ip, parent_ip, flags); +} + +void __trace_stack(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + int skip) +{ + struct trace_entry *entry; + struct stack_trace trace; + + if (!(trace_flags & TRACE_ITER_STACKTRACE)) + return; + + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_STACK; + + memset(&entry->stack, 0, sizeof(entry->stack)); + + trace.nr_entries = 0; + trace.max_entries = FTRACE_STACK_ENTRIES; + trace.skip = skip; + trace.entries = entry->stack.caller; + + save_stack_trace(&trace); +} + +void +__trace_special(void *__tr, void *__data, + unsigned long arg1, unsigned long arg2, unsigned long arg3) +{ + struct trace_array_cpu *data = __data; + struct trace_array *tr = __tr; + struct trace_entry *entry; + unsigned long irq_flags; + + raw_local_irq_save(irq_flags); + __raw_spin_lock(&data->lock); + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, 0); + entry->type = TRACE_SPECIAL; + entry->special.arg1 = arg1; + entry->special.arg2 = arg2; + entry->special.arg3 = arg3; + __trace_stack(tr, data, irq_flags, 4); + __raw_spin_unlock(&data->lock); + raw_local_irq_restore(irq_flags); + + trace_wake_up(); +} + +void +tracing_sched_switch_trace(struct trace_array *tr, + struct trace_array_cpu *data, + struct task_struct *prev, + struct task_struct *next, + unsigned long flags) +{ + struct trace_entry *entry; + unsigned long irq_flags; + + raw_local_irq_save(irq_flags); + __raw_spin_lock(&data->lock); + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_CTX; + entry->ctx.prev_pid = prev->pid; + entry->ctx.prev_prio = prev->prio; + entry->ctx.prev_state = prev->state; + entry->ctx.next_pid = next->pid; + entry->ctx.next_prio = next->prio; + entry->ctx.next_state = next->state; + __trace_stack(tr, data, flags, 5); + __raw_spin_unlock(&data->lock); + raw_local_irq_restore(irq_flags); +} + +void +tracing_sched_wakeup_trace(struct trace_array *tr, + struct trace_array_cpu *data, + struct task_struct *wakee, + struct task_struct *curr, + unsigned long flags) +{ + struct trace_entry *entry; + unsigned long irq_flags; + + raw_local_irq_save(irq_flags); + __raw_spin_lock(&data->lock); + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_WAKE; + entry->ctx.prev_pid = curr->pid; + entry->ctx.prev_prio = curr->prio; + entry->ctx.prev_state = curr->state; + entry->ctx.next_pid = wakee->pid; + entry->ctx.next_prio = wakee->prio; + entry->ctx.next_state = wakee->state; + __trace_stack(tr, data, flags, 6); + __raw_spin_unlock(&data->lock); + raw_local_irq_restore(irq_flags); + + trace_wake_up(); +} + +void +ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) +{ + struct trace_array *tr = &global_trace; + struct trace_array_cpu *data; + unsigned long flags; + long disabled; + int cpu; + + if (tracing_disabled || current_trace == &no_tracer || !tr->ctrl) + return; + + local_irq_save(flags); + cpu = raw_smp_processor_id(); + data = tr->data[cpu]; + disabled = atomic_inc_return(&data->disabled); + + if (likely(disabled == 1)) + __trace_special(tr, data, arg1, arg2, arg3); + + atomic_dec(&data->disabled); + local_irq_restore(flags); +} + +#ifdef CONFIG_FTRACE +static void +function_trace_call(unsigned long ip, unsigned long parent_ip) +{ + struct trace_array *tr = &global_trace; + struct trace_array_cpu *data; + unsigned long flags; + long disabled; + int cpu; + + if (unlikely(!tracer_enabled)) + return; + + if (skip_trace(ip)) + return; + + local_irq_save(flags); + cpu = raw_smp_processor_id(); + data = tr->data[cpu]; + disabled = atomic_inc_return(&data->disabled); + + if (likely(disabled == 1)) + trace_function(tr, data, ip, parent_ip, flags); + + atomic_dec(&data->disabled); + local_irq_restore(flags); +} + +static struct ftrace_ops trace_ops __read_mostly = +{ + .func = function_trace_call, +}; + +void tracing_start_function_trace(void) +{ + register_ftrace_function(&trace_ops); +} + +void tracing_stop_function_trace(void) +{ + unregister_ftrace_function(&trace_ops); +} +#endif + +enum trace_file_type { + TRACE_FILE_LAT_FMT = 1, +}; + +static struct trace_entry * +trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, + struct trace_iterator *iter, int cpu) +{ + struct page *page; + struct trace_entry *array; + + if (iter->next_idx[cpu] >= tr->entries || + iter->next_idx[cpu] >= data->trace_idx || + (data->trace_head == data->trace_tail && + data->trace_head_idx == data->trace_tail_idx)) + return NULL; + + if (!iter->next_page[cpu]) { + /* Initialize the iterator for this cpu trace buffer */ + WARN_ON(!data->trace_tail); + page = virt_to_page(data->trace_tail); + iter->next_page[cpu] = &page->lru; + iter->next_page_idx[cpu] = data->trace_tail_idx; + } + + page = list_entry(iter->next_page[cpu], struct page, lru); + BUG_ON(&data->trace_pages == &page->lru); + + array = page_address(page); + + WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); + return &array[iter->next_page_idx[cpu]]; +} + +static struct trace_entry * +find_next_entry(struct trace_iterator *iter, int *ent_cpu) +{ + struct trace_array *tr = iter->tr; + struct trace_entry *ent, *next = NULL; + int next_cpu = -1; + int cpu; + + for_each_tracing_cpu(cpu) { + if (!head_page(tr->data[cpu])) + continue; + ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); + /* + * Pick the entry with the smallest timestamp: + */ + if (ent && (!next || ent->t < next->t)) { + next = ent; + next_cpu = cpu; + } + } + + if (ent_cpu) + *ent_cpu = next_cpu; + + return next; +} + +static void trace_iterator_increment(struct trace_iterator *iter) +{ + iter->idx++; + iter->next_idx[iter->cpu]++; + iter->next_page_idx[iter->cpu]++; + + if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { + struct trace_array_cpu *data = iter->tr->data[iter->cpu]; + + iter->next_page_idx[iter->cpu] = 0; + iter->next_page[iter->cpu] = + trace_next_list(data, iter->next_page[iter->cpu]); + } +} + +static void trace_consume(struct trace_iterator *iter) +{ + struct trace_array_cpu *data = iter->tr->data[iter->cpu]; + + data->trace_tail_idx++; + if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { + data->trace_tail = trace_next_page(data, data->trace_tail); + data->trace_tail_idx = 0; + } + + /* Check if we empty it, then reset the index */ + if (data->trace_head == data->trace_tail && + data->trace_head_idx == data->trace_tail_idx) + data->trace_idx = 0; +} + +static void *find_next_entry_inc(struct trace_iterator *iter) +{ + struct trace_entry *next; + int next_cpu = -1; + + next = find_next_entry(iter, &next_cpu); + + iter->prev_ent = iter->ent; + iter->prev_cpu = iter->cpu; + + iter->ent = next; + iter->cpu = next_cpu; + + if (next) + trace_iterator_increment(iter); + + return next ? iter : NULL; +} + +static void *s_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct trace_iterator *iter = m->private; + void *last_ent = iter->ent; + int i = (int)*pos; + void *ent; + + (*pos)++; + + /* can't go backwards */ + if (iter->idx > i) + return NULL; + + if (iter->idx < 0) + ent = find_next_entry_inc(iter); + else + ent = iter; + + while (ent && iter->idx < i) + ent = find_next_entry_inc(iter); + + iter->pos = *pos; + + if (last_ent && !ent) + seq_puts(m, "\n\nvim:ft=help\n"); + + return ent; +} + +static void *s_start(struct seq_file *m, loff_t *pos) +{ + struct trace_iterator *iter = m->private; + void *p = NULL; + loff_t l = 0; + int i; + + mutex_lock(&trace_types_lock); + + if (!current_trace || current_trace != iter->trace) { + mutex_unlock(&trace_types_lock); + return NULL; + } + + atomic_inc(&trace_record_cmdline_disabled); + + /* let the tracer grab locks here if needed */ + if (current_trace->start) + current_trace->start(iter); + + if (*pos != iter->pos) { + iter->ent = NULL; + iter->cpu = 0; + iter->idx = -1; + iter->prev_ent = NULL; + iter->prev_cpu = -1; + + for_each_tracing_cpu(i) { + iter->next_idx[i] = 0; + iter->next_page[i] = NULL; + } + + for (p = iter; p && l < *pos; p = s_next(m, p, &l)) + ; + + } else { + l = *pos - 1; + p = s_next(m, p, &l); + } + + return p; +} + +static void s_stop(struct seq_file *m, void *p) +{ + struct trace_iterator *iter = m->private; + + atomic_dec(&trace_record_cmdline_disabled); + + /* let the tracer release locks here if needed */ + if (current_trace && current_trace == iter->trace && iter->trace->stop) + iter->trace->stop(iter); + + mutex_unlock(&trace_types_lock); +} + +#define KRETPROBE_MSG "[unknown/kretprobe'd]" + +#ifdef CONFIG_KRETPROBES +static inline int kretprobed(unsigned long addr) +{ + return addr == (unsigned long)kretprobe_trampoline; +} +#else +static inline int kretprobed(unsigned long addr) +{ + return 0; +} +#endif /* CONFIG_KRETPROBES */ + +static int +seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) +{ +#ifdef CONFIG_KALLSYMS + char str[KSYM_SYMBOL_LEN]; + + kallsyms_lookup(address, NULL, NULL, NULL, str); + + return trace_seq_printf(s, fmt, str); +#endif + return 1; +} + +static int +seq_print_sym_offset(struct trace_seq *s, const char *fmt, + unsigned long address) +{ +#ifdef CONFIG_KALLSYMS + char str[KSYM_SYMBOL_LEN]; + + sprint_symbol(str, address); + return trace_seq_printf(s, fmt, str); +#endif + return 1; +} + +#ifndef CONFIG_64BIT +# define IP_FMT "%08lx" +#else +# define IP_FMT "%016lx" +#endif + +static int +seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) +{ + int ret; + + if (!ip) + return trace_seq_printf(s, "0"); + + if (sym_flags & TRACE_ITER_SYM_OFFSET) + ret = seq_print_sym_offset(s, "%s", ip); + else + ret = seq_print_sym_short(s, "%s", ip); + + if (!ret) + return 0; + + if (sym_flags & TRACE_ITER_SYM_ADDR) + ret = trace_seq_printf(s, " <" IP_FMT ">", ip); + return ret; +} + +static void print_lat_help_header(struct seq_file *m) +{ + seq_puts(m, "# _------=> CPU# \n"); + seq_puts(m, "# / _-----=> irqs-off \n"); + seq_puts(m, "# | / _----=> need-resched \n"); + seq_puts(m, "# || / _---=> hardirq/softirq \n"); + seq_puts(m, "# ||| / _--=> preempt-depth \n"); + seq_puts(m, "# |||| / \n"); + seq_puts(m, "# ||||| delay \n"); + seq_puts(m, "# cmd pid ||||| time | caller \n"); + seq_puts(m, "# \\ / ||||| \\ | / \n"); +} + +static void print_func_help_header(struct seq_file *m) +{ + seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); + seq_puts(m, "# | | | | |\n"); +} + + +static void +print_trace_header(struct seq_file *m, struct trace_iterator *iter) +{ + unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); + struct trace_array *tr = iter->tr; + struct trace_array_cpu *data = tr->data[tr->cpu]; + struct tracer *type = current_trace; + unsigned long total = 0; + unsigned long entries = 0; + int cpu; + const char *name = "preemption"; + + if (type) + name = type->name; + + for_each_tracing_cpu(cpu) { + if (head_page(tr->data[cpu])) { + total += tr->data[cpu]->trace_idx; + if (tr->data[cpu]->trace_idx > tr->entries) + entries += tr->entries; + else + entries += tr->data[cpu]->trace_idx; + } + } + + seq_printf(m, "%s latency trace v1.1.5 on %s\n", + name, UTS_RELEASE); + seq_puts(m, "-----------------------------------" + "---------------------------------\n"); + seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" + " (M:%s VP:%d, KP:%d, SP:%d HP:%d", + nsecs_to_usecs(data->saved_latency), + entries, + total, + tr->cpu, +#if defined(CONFIG_PREEMPT_NONE) + "server", +#elif defined(CONFIG_PREEMPT_VOLUNTARY) + "desktop", +#elif defined(CONFIG_PREEMPT_DESKTOP) + "preempt", +#else + "unknown", +#endif + /* These are reserved for later use */ + 0, 0, 0, 0); +#ifdef CONFIG_SMP + seq_printf(m, " #P:%d)\n", num_online_cpus()); +#else + seq_puts(m, ")\n"); +#endif + seq_puts(m, " -----------------\n"); + seq_printf(m, " | task: %.16s-%d " + "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", + data->comm, data->pid, data->uid, data->nice, + data->policy, data->rt_priority); + seq_puts(m, " -----------------\n"); + + if (data->critical_start) { + seq_puts(m, " => started at: "); + seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); + trace_print_seq(m, &iter->seq); + seq_puts(m, "\n => ended at: "); + seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); + trace_print_seq(m, &iter->seq); + seq_puts(m, "\n"); + } + + seq_puts(m, "\n"); +} + +static void +lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) +{ + int hardirq, softirq; + char *comm; + + comm = trace_find_cmdline(entry->pid); + + trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); + trace_seq_printf(s, "%d", cpu); + trace_seq_printf(s, "%c%c", + (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', + ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); + + hardirq = entry->flags & TRACE_FLAG_HARDIRQ; + softirq = entry->flags & TRACE_FLAG_SOFTIRQ; + if (hardirq && softirq) { + trace_seq_putc(s, 'H'); + } else { + if (hardirq) { + trace_seq_putc(s, 'h'); + } else { + if (softirq) + trace_seq_putc(s, 's'); + else + trace_seq_putc(s, '.'); + } + } + + if (entry->preempt_count) + trace_seq_printf(s, "%x", entry->preempt_count); + else + trace_seq_puts(s, "."); +} + +unsigned long preempt_mark_thresh = 100; + +static void +lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, + unsigned long rel_usecs) +{ + trace_seq_printf(s, " %4lldus", abs_usecs); + if (rel_usecs > preempt_mark_thresh) + trace_seq_puts(s, "!: "); + else if (rel_usecs > 1) + trace_seq_puts(s, "+: "); + else + trace_seq_puts(s, " : "); +} + +static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; + +static int +print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) +{ + struct trace_seq *s = &iter->seq; + unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); + struct trace_entry *next_entry = find_next_entry(iter, NULL); + unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); + struct trace_entry *entry = iter->ent; + unsigned long abs_usecs; + unsigned long rel_usecs; + char *comm; + int S, T; + int i; + unsigned state; + + if (!next_entry) + next_entry = entry; + rel_usecs = ns2usecs(next_entry->t - entry->t); + abs_usecs = ns2usecs(entry->t - iter->tr->time_start); + + if (verbose) { + comm = trace_find_cmdline(entry->pid); + trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" + " %ld.%03ldms (+%ld.%03ldms): ", + comm, + entry->pid, cpu, entry->flags, + entry->preempt_count, trace_idx, + ns2usecs(entry->t), + abs_usecs/1000, + abs_usecs % 1000, rel_usecs/1000, + rel_usecs % 1000); + } else { + lat_print_generic(s, entry, cpu); + lat_print_timestamp(s, abs_usecs, rel_usecs); + } + switch (entry->type) { + case TRACE_FN: + seq_print_ip_sym(s, entry->fn.ip, sym_flags); + trace_seq_puts(s, " ("); + if (kretprobed(entry->fn.parent_ip)) + trace_seq_puts(s, KRETPROBE_MSG); + else + seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); + trace_seq_puts(s, ")\n"); + break; + case TRACE_CTX: + case TRACE_WAKE: + T = entry->ctx.next_state < sizeof(state_to_char) ? + state_to_char[entry->ctx.next_state] : 'X'; + + state = entry->ctx.prev_state ? __ffs(entry->ctx.prev_state) + 1 : 0; + S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; + comm = trace_find_cmdline(entry->ctx.next_pid); + trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c %s\n", + entry->ctx.prev_pid, + entry->ctx.prev_prio, + S, entry->type == TRACE_CTX ? "==>" : " +", + entry->ctx.next_pid, + entry->ctx.next_prio, + T, comm); + break; + case TRACE_SPECIAL: + trace_seq_printf(s, "# %ld %ld %ld\n", + entry->special.arg1, + entry->special.arg2, + entry->special.arg3); + break; + case TRACE_STACK: + for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { + if (i) + trace_seq_puts(s, " <= "); + seq_print_ip_sym(s, entry->stack.caller[i], sym_flags); + } + trace_seq_puts(s, "\n"); + break; + default: + trace_seq_printf(s, "Unknown type %d\n", entry->type); + } + return 1; +} + +static int print_trace_fmt(struct trace_iterator *iter) +{ + struct trace_seq *s = &iter->seq; + unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); + struct trace_entry *entry; + unsigned long usec_rem; + unsigned long long t; + unsigned long secs; + char *comm; + int ret; + int S, T; + int i; + + entry = iter->ent; + + comm = trace_find_cmdline(iter->ent->pid); + + t = ns2usecs(entry->t); + usec_rem = do_div(t, 1000000ULL); + secs = (unsigned long)t; + + ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); + if (!ret) + return 0; + ret = trace_seq_printf(s, "[%02d] ", iter->cpu); + if (!ret) + return 0; + ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); + if (!ret) + return 0; + + switch (entry->type) { + case TRACE_FN: + ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); + if (!ret) + return 0; + if ((sym_flags & TRACE_ITER_PRINT_PARENT) && + entry->fn.parent_ip) { + ret = trace_seq_printf(s, " <-"); + if (!ret) + return 0; + if (kretprobed(entry->fn.parent_ip)) + ret = trace_seq_puts(s, KRETPROBE_MSG); + else + ret = seq_print_ip_sym(s, entry->fn.parent_ip, + sym_flags); + if (!ret) + return 0; + } + ret = trace_seq_printf(s, "\n"); + if (!ret) + return 0; + break; + case TRACE_CTX: + case TRACE_WAKE: + S = entry->ctx.prev_state < sizeof(state_to_char) ? + state_to_char[entry->ctx.prev_state] : 'X'; + T = entry->ctx.next_state < sizeof(state_to_char) ? + state_to_char[entry->ctx.next_state] : 'X'; + ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c\n", + entry->ctx.prev_pid, + entry->ctx.prev_prio, + S, + entry->type == TRACE_CTX ? "==>" : " +", + entry->ctx.next_pid, + entry->ctx.next_prio, + T); + if (!ret) + return 0; + break; + case TRACE_SPECIAL: + ret = trace_seq_printf(s, "# %ld %ld %ld\n", + entry->special.arg1, + entry->special.arg2, + entry->special.arg3); + if (!ret) + return 0; + break; + case TRACE_STACK: + for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { + if (i) { + ret = trace_seq_puts(s, " <= "); + if (!ret) + return 0; + } + ret = seq_print_ip_sym(s, entry->stack.caller[i], + sym_flags); + if (!ret) + return 0; + } + ret = trace_seq_puts(s, "\n"); + if (!ret) + return 0; + break; + } + return 1; +} + +static int print_raw_fmt(struct trace_iterator *iter) +{ + struct trace_seq *s = &iter->seq; + struct trace_entry *entry; + int ret; + int S, T; + + entry = iter->ent; + + ret = trace_seq_printf(s, "%d %d %llu ", + entry->pid, iter->cpu, entry->t); + if (!ret) + return 0; + + switch (entry->type) { + case TRACE_FN: + ret = trace_seq_printf(s, "%x %x\n", + entry->fn.ip, entry->fn.parent_ip); + if (!ret) + return 0; + break; + case TRACE_CTX: + case TRACE_WAKE: + S = entry->ctx.prev_state < sizeof(state_to_char) ? + state_to_char[entry->ctx.prev_state] : 'X'; + T = entry->ctx.next_state < sizeof(state_to_char) ? + state_to_char[entry->ctx.next_state] : 'X'; + if (entry->type == TRACE_WAKE) + S = '+'; + ret = trace_seq_printf(s, "%d %d %c %d %d %c\n", + entry->ctx.prev_pid, + entry->ctx.prev_prio, + S, + entry->ctx.next_pid, + entry->ctx.next_prio, + T); + if (!ret) + return 0; + break; + case TRACE_SPECIAL: + case TRACE_STACK: + ret = trace_seq_printf(s, "# %ld %ld %ld\n", + entry->special.arg1, + entry->special.arg2, + entry->special.arg3); + if (!ret) + return 0; + break; + } + return 1; +} + +#define SEQ_PUT_FIELD_RET(s, x) \ +do { \ + if (!trace_seq_putmem(s, &(x), sizeof(x))) \ + return 0; \ +} while (0) + +#define SEQ_PUT_HEX_FIELD_RET(s, x) \ +do { \ + if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ + return 0; \ +} while (0) + +static int print_hex_fmt(struct trace_iterator *iter) +{ + struct trace_seq *s = &iter->seq; + unsigned char newline = '\n'; + struct trace_entry *entry; + int S, T; + + entry = iter->ent; + + SEQ_PUT_HEX_FIELD_RET(s, entry->pid); + SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); + SEQ_PUT_HEX_FIELD_RET(s, entry->t); + + switch (entry->type) { + case TRACE_FN: + SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); + SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); + break; + case TRACE_CTX: + case TRACE_WAKE: + S = entry->ctx.prev_state < sizeof(state_to_char) ? + state_to_char[entry->ctx.prev_state] : 'X'; + T = entry->ctx.next_state < sizeof(state_to_char) ? + state_to_char[entry->ctx.next_state] : 'X'; + if (entry->type == TRACE_WAKE) + S = '+'; + SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); + SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); + SEQ_PUT_HEX_FIELD_RET(s, S); + SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); + SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); + SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); + SEQ_PUT_HEX_FIELD_RET(s, T); + break; + case TRACE_SPECIAL: + case TRACE_STACK: + SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); + SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); + SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); + break; + } + SEQ_PUT_FIELD_RET(s, newline); + + return 1; +} + +static int print_bin_fmt(struct trace_iterator *iter) +{ + struct trace_seq *s = &iter->seq; + struct trace_entry *entry; + + entry = iter->ent; + + SEQ_PUT_FIELD_RET(s, entry->pid); + SEQ_PUT_FIELD_RET(s, entry->cpu); + SEQ_PUT_FIELD_RET(s, entry->t); + + switch (entry->type) { + case TRACE_FN: + SEQ_PUT_FIELD_RET(s, entry->fn.ip); + SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); + break; + case TRACE_CTX: + SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); + SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); + SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); + SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); + SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); + SEQ_PUT_FIELD_RET(s, entry->ctx.next_state); + break; + case TRACE_SPECIAL: + case TRACE_STACK: + SEQ_PUT_FIELD_RET(s, entry->special.arg1); + SEQ_PUT_FIELD_RET(s, entry->special.arg2); + SEQ_PUT_FIELD_RET(s, entry->special.arg3); + break; + } + return 1; +} + +static int trace_empty(struct trace_iterator *iter) +{ + struct trace_array_cpu *data; + int cpu; + + for_each_tracing_cpu(cpu) { + data = iter->tr->data[cpu]; + + if (head_page(data) && data->trace_idx && + (data->trace_tail != data->trace_head || + data->trace_tail_idx != data->trace_head_idx)) + return 0; + } + return 1; +} + +static int print_trace_line(struct trace_iterator *iter) +{ + if (iter->trace && iter->trace->print_line) + return iter->trace->print_line(iter); + + if (trace_flags & TRACE_ITER_BIN) + return print_bin_fmt(iter); + + if (trace_flags & TRACE_ITER_HEX) + return print_hex_fmt(iter); + + if (trace_flags & TRACE_ITER_RAW) + return print_raw_fmt(iter); + + if (iter->iter_flags & TRACE_FILE_LAT_FMT) + return print_lat_fmt(iter, iter->idx, iter->cpu); + + return print_trace_fmt(iter); +} + +static int s_show(struct seq_file *m, void *v) +{ + struct trace_iterator *iter = v; + + if (iter->ent == NULL) { + if (iter->tr) { + seq_printf(m, "# tracer: %s\n", iter->trace->name); + seq_puts(m, "#\n"); + } + if (iter->iter_flags & TRACE_FILE_LAT_FMT) { + /* print nothing if the buffers are empty */ + if (trace_empty(iter)) + return 0; + print_trace_header(m, iter); + if (!(trace_flags & TRACE_ITER_VERBOSE)) + print_lat_help_header(m); + } else { + if (!(trace_flags & TRACE_ITER_VERBOSE)) + print_func_help_header(m); + } + } else { + print_trace_line(iter); + trace_print_seq(m, &iter->seq); + } + + return 0; +} + +static struct seq_operations tracer_seq_ops = { + .start = s_start, + .next = s_next, + .stop = s_stop, + .show = s_show, +}; + +static struct trace_iterator * +__tracing_open(struct inode *inode, struct file *file, int *ret) +{ + struct trace_iterator *iter; + + if (tracing_disabled) { + *ret = -ENODEV; + return NULL; + } + + iter = kzalloc(sizeof(*iter), GFP_KERNEL); + if (!iter) { + *ret = -ENOMEM; + goto out; + } + + mutex_lock(&trace_types_lock); + if (current_trace && current_trace->print_max) + iter->tr = &max_tr; + else + iter->tr = inode->i_private; + iter->trace = current_trace; + iter->pos = -1; + + /* TODO stop tracer */ + *ret = seq_open(file, &tracer_seq_ops); + if (!*ret) { + struct seq_file *m = file->private_data; + m->private = iter; + + /* stop the trace while dumping */ + if (iter->tr->ctrl) + tracer_enabled = 0; + + if (iter->trace && iter->trace->open) + iter->trace->open(iter); + } else { + kfree(iter); + iter = NULL; + } + mutex_unlock(&trace_types_lock); + + out: + return iter; +} + +int tracing_open_generic(struct inode *inode, struct file *filp) +{ + if (tracing_disabled) + return -ENODEV; + + filp->private_data = inode->i_private; + return 0; +} + +int tracing_release(struct inode *inode, struct file *file) +{ + struct seq_file *m = (struct seq_file *)file->private_data; + struct trace_iterator *iter = m->private; + + mutex_lock(&trace_types_lock); + if (iter->trace && iter->trace->close) + iter->trace->close(iter); + + /* reenable tracing if it was previously enabled */ + if (iter->tr->ctrl) + tracer_enabled = 1; + mutex_unlock(&trace_types_lock); + + seq_release(inode, file); + kfree(iter); + return 0; +} + +static int tracing_open(struct inode *inode, struct file *file) +{ + int ret; + + __tracing_open(inode, file, &ret); + + return ret; +} + +static int tracing_lt_open(struct inode *inode, struct file *file) +{ + struct trace_iterator *iter; + int ret; + + iter = __tracing_open(inode, file, &ret); + + if (!ret) + iter->iter_flags |= TRACE_FILE_LAT_FMT; + + return ret; +} + + +static void * +t_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct tracer *t = m->private; + + (*pos)++; + + if (t) + t = t->next; + + m->private = t; + + return t; +} + +static void *t_start(struct seq_file *m, loff_t *pos) +{ + struct tracer *t = m->private; + loff_t l = 0; + + mutex_lock(&trace_types_lock); + for (; t && l < *pos; t = t_next(m, t, &l)) + ; + + return t; +} + +static void t_stop(struct seq_file *m, void *p) +{ + mutex_unlock(&trace_types_lock); +} + +static int t_show(struct seq_file *m, void *v) +{ + struct tracer *t = v; + + if (!t) + return 0; + + seq_printf(m, "%s", t->name); + if (t->next) + seq_putc(m, ' '); + else + seq_putc(m, '\n'); + + return 0; +} + +static struct seq_operations show_traces_seq_ops = { + .start = t_start, + .next = t_next, + .stop = t_stop, + .show = t_show, +}; + +static int show_traces_open(struct inode *inode, struct file *file) +{ + int ret; + + if (tracing_disabled) + return -ENODEV; + + ret = seq_open(file, &show_traces_seq_ops); + if (!ret) { + struct seq_file *m = file->private_data; + m->private = trace_types; + } + + return ret; +} + +static struct file_operations tracing_fops = { + .open = tracing_open, + .read = seq_read, + .llseek = seq_lseek, + .release = tracing_release, +}; + +static struct file_operations tracing_lt_fops = { + .open = tracing_lt_open, + .read = seq_read, + .llseek = seq_lseek, + .release = tracing_release, +}; + +static struct file_operations show_traces_fops = { + .open = show_traces_open, + .read = seq_read, + .release = seq_release, +}; + +/* + * Only trace on a CPU if the bitmask is set: + */ +static cpumask_t tracing_cpumask = CPU_MASK_ALL; + +/* + * When tracing/tracing_cpu_mask is modified then this holds + * the new bitmask we are about to install: + */ +static cpumask_t tracing_cpumask_new; + +/* + * The tracer itself will not take this lock, but still we want + * to provide a consistent cpumask to user-space: + */ +static DEFINE_MUTEX(tracing_cpumask_update_lock); + +/* + * Temporary storage for the character representation of the + * CPU bitmask (and one more byte for the newline): + */ +static char mask_str[NR_CPUS + 1]; + +static ssize_t +tracing_cpumask_read(struct file *filp, char __user *ubuf, + size_t count, loff_t *ppos) +{ + int len; + + mutex_lock(&tracing_cpumask_update_lock); + + len = cpumask_scnprintf(mask_str, count, tracing_cpumask); + if (count - len < 2) { + count = -EINVAL; + goto out_err; + } + len += sprintf(mask_str + len, "\n"); + count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); + +out_err: + mutex_unlock(&tracing_cpumask_update_lock); + + return count; +} + +static ssize_t +tracing_cpumask_write(struct file *filp, const char __user *ubuf, + size_t count, loff_t *ppos) +{ + int err, cpu; + + mutex_lock(&tracing_cpumask_update_lock); + err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); + if (err) + goto err_unlock; + + raw_local_irq_disable(); + __raw_spin_lock(&ftrace_max_lock); + for_each_tracing_cpu(cpu) { + /* + * Increase/decrease the disabled counter if we are + * about to flip a bit in the cpumask: + */ + if (cpu_isset(cpu, tracing_cpumask) && + !cpu_isset(cpu, tracing_cpumask_new)) { + atomic_inc(&global_trace.data[cpu]->disabled); + } + if (!cpu_isset(cpu, tracing_cpumask) && + cpu_isset(cpu, tracing_cpumask_new)) { + atomic_dec(&global_trace.data[cpu]->disabled); + } + } + __raw_spin_unlock(&ftrace_max_lock); + raw_local_irq_enable(); + + tracing_cpumask = tracing_cpumask_new; + + mutex_unlock(&tracing_cpumask_update_lock); + + return count; + +err_unlock: + mutex_unlock(&tracing_cpumask_update_lock); + + return err; +} + +static struct file_operations tracing_cpumask_fops = { + .open = tracing_open_generic, + .read = tracing_cpumask_read, + .write = tracing_cpumask_write, +}; + +static ssize_t +tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + char *buf; + int r = 0; + int len = 0; + int i; + + /* calulate max size */ + for (i = 0; trace_options[i]; i++) { + len += strlen(trace_options[i]); + len += 3; /* "no" and space */ + } + + /* +2 for \n and \0 */ + buf = kmalloc(len + 2, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + for (i = 0; trace_options[i]; i++) { + if (trace_flags & (1 << i)) + r += sprintf(buf + r, "%s ", trace_options[i]); + else + r += sprintf(buf + r, "no%s ", trace_options[i]); + } + + r += sprintf(buf + r, "\n"); + WARN_ON(r >= len + 2); + + r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); + + kfree(buf); + + return r; +} + +static ssize_t +tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + char buf[64]; + char *cmp = buf; + int neg = 0; + int i; + + if (cnt >= sizeof(buf)) + return -EINVAL; + + if (copy_from_user(&buf, ubuf, cnt)) + return -EFAULT; + + buf[cnt] = 0; + + if (strncmp(buf, "no", 2) == 0) { + neg = 1; + cmp += 2; + } + + for (i = 0; trace_options[i]; i++) { + int len = strlen(trace_options[i]); + + if (strncmp(cmp, trace_options[i], len) == 0) { + if (neg) + trace_flags &= ~(1 << i); + else + trace_flags |= (1 << i); + break; + } + } + /* + * If no option could be set, return an error: + */ + if (!trace_options[i]) + return -EINVAL; + + filp->f_pos += cnt; + + return cnt; +} + +static struct file_operations tracing_iter_fops = { + .open = tracing_open_generic, + .read = tracing_iter_ctrl_read, + .write = tracing_iter_ctrl_write, +}; + +static const char readme_msg[] = + "tracing mini-HOWTO:\n\n" + "# mkdir /debug\n" + "# mount -t debugfs nodev /debug\n\n" + "# cat /debug/tracing/available_tracers\n" + "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" + "# cat /debug/tracing/current_tracer\n" + "none\n" + "# echo sched_switch > /debug/tracing/current_tracer\n" + "# cat /debug/tracing/current_tracer\n" + "sched_switch\n" + "# cat /debug/tracing/iter_ctrl\n" + "noprint-parent nosym-offset nosym-addr noverbose\n" + "# echo print-parent > /debug/tracing/iter_ctrl\n" + "# echo 1 > /debug/tracing/tracing_enabled\n" + "# cat /debug/tracing/trace > /tmp/trace.txt\n" + "echo 0 > /debug/tracing/tracing_enabled\n" +; + +static ssize_t +tracing_readme_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + return simple_read_from_buffer(ubuf, cnt, ppos, + readme_msg, strlen(readme_msg)); +} + +static struct file_operations tracing_readme_fops = { + .open = tracing_open_generic, + .read = tracing_readme_read, +}; + +static ssize_t +tracing_ctrl_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + struct trace_array *tr = filp->private_data; + char buf[64]; + int r; + + r = sprintf(buf, "%ld\n", tr->ctrl); + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); +} + +static ssize_t +tracing_ctrl_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + struct trace_array *tr = filp->private_data; + char buf[64]; + long val; + int ret; + + if (cnt >= sizeof(buf)) + return -EINVAL; + + if (copy_from_user(&buf, ubuf, cnt)) + return -EFAULT; + + buf[cnt] = 0; + + ret = strict_strtoul(buf, 10, &val); + if (ret < 0) + return ret; + + val = !!val; + + mutex_lock(&trace_types_lock); + if (tr->ctrl ^ val) { + if (val) + tracer_enabled = 1; + else + tracer_enabled = 0; + + tr->ctrl = val; + + if (current_trace && current_trace->ctrl_update) + current_trace->ctrl_update(tr); + } + mutex_unlock(&trace_types_lock); + + filp->f_pos += cnt; + + return cnt; +} + +static ssize_t +tracing_set_trace_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + char buf[max_tracer_type_len+2]; + int r; + + mutex_lock(&trace_types_lock); + if (current_trace) + r = sprintf(buf, "%s\n", current_trace->name); + else + r = sprintf(buf, "\n"); + mutex_unlock(&trace_types_lock); + + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); +} + +static ssize_t +tracing_set_trace_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + struct trace_array *tr = &global_trace; + struct tracer *t; + char buf[max_tracer_type_len+1]; + int i; + + if (cnt > max_tracer_type_len) + cnt = max_tracer_type_len; + + if (copy_from_user(&buf, ubuf, cnt)) + return -EFAULT; + + buf[cnt] = 0; + + /* strip ending whitespace. */ + for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) + buf[i] = 0; + + mutex_lock(&trace_types_lock); + for (t = trace_types; t; t = t->next) { + if (strcmp(t->name, buf) == 0) + break; + } + if (!t || t == current_trace) + goto out; + + if (current_trace && current_trace->reset) + current_trace->reset(tr); + + current_trace = t; + if (t->init) + t->init(tr); + + out: + mutex_unlock(&trace_types_lock); + + filp->f_pos += cnt; + + return cnt; +} + +static ssize_t +tracing_max_lat_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + unsigned long *ptr = filp->private_data; + char buf[64]; + int r; + + r = snprintf(buf, sizeof(buf), "%ld\n", + *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); + if (r > sizeof(buf)) + r = sizeof(buf); + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); +} + +static ssize_t +tracing_max_lat_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + long *ptr = filp->private_data; + char buf[64]; + long val; + int ret; + + if (cnt >= sizeof(buf)) + return -EINVAL; + + if (copy_from_user(&buf, ubuf, cnt)) + return -EFAULT; + + buf[cnt] = 0; + + ret = strict_strtoul(buf, 10, &val); + if (ret < 0) + return ret; + + *ptr = val * 1000; + + return cnt; +} + +static atomic_t tracing_reader; + +static int tracing_open_pipe(struct inode *inode, struct file *filp) +{ + struct trace_iterator *iter; + + if (tracing_disabled) + return -ENODEV; + + /* We only allow for reader of the pipe */ + if (atomic_inc_return(&tracing_reader) != 1) { + atomic_dec(&tracing_reader); + return -EBUSY; + } + + /* create a buffer to store the information to pass to userspace */ + iter = kzalloc(sizeof(*iter), GFP_KERNEL); + if (!iter) + return -ENOMEM; + + mutex_lock(&trace_types_lock); + iter->tr = &global_trace; + iter->trace = current_trace; + filp->private_data = iter; + + if (iter->trace->pipe_open) + iter->trace->pipe_open(iter); + mutex_unlock(&trace_types_lock); + + return 0; +} + +static int tracing_release_pipe(struct inode *inode, struct file *file) +{ + struct trace_iterator *iter = file->private_data; + + kfree(iter); + atomic_dec(&tracing_reader); + + return 0; +} + +static unsigned int +tracing_poll_pipe(struct file *filp, poll_table *poll_table) +{ + struct trace_iterator *iter = filp->private_data; + + if (trace_flags & TRACE_ITER_BLOCK) { + /* + * Always select as readable when in blocking mode + */ + return POLLIN | POLLRDNORM; + } else { + if (!trace_empty(iter)) + return POLLIN | POLLRDNORM; + poll_wait(filp, &trace_wait, poll_table); + if (!trace_empty(iter)) + return POLLIN | POLLRDNORM; + + return 0; + } +} + +/* + * Consumer reader. + */ +static ssize_t +tracing_read_pipe(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + struct trace_iterator *iter = filp->private_data; + struct trace_array_cpu *data; + static cpumask_t mask; + unsigned long flags; +#ifdef CONFIG_FTRACE + int ftrace_save; +#endif + int cpu; + ssize_t sret; + + /* return any leftover data */ + sret = trace_seq_to_user(&iter->seq, ubuf, cnt); + if (sret != -EBUSY) + return sret; + sret = 0; + + trace_seq_reset(&iter->seq); + + mutex_lock(&trace_types_lock); + if (iter->trace->read) { + sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); + if (sret) + goto out; + } + + while (trace_empty(iter)) { + + if ((filp->f_flags & O_NONBLOCK)) { + sret = -EAGAIN; + goto out; + } + + /* + * This is a make-shift waitqueue. The reason we don't use + * an actual wait queue is because: + * 1) we only ever have one waiter + * 2) the tracing, traces all functions, we don't want + * the overhead of calling wake_up and friends + * (and tracing them too) + * Anyway, this is really very primitive wakeup. + */ + set_current_state(TASK_INTERRUPTIBLE); + iter->tr->waiter = current; + + mutex_unlock(&trace_types_lock); + + /* sleep for 100 msecs, and try again. */ + schedule_timeout(HZ/10); + + mutex_lock(&trace_types_lock); + + iter->tr->waiter = NULL; + + if (signal_pending(current)) { + sret = -EINTR; + goto out; + } + + if (iter->trace != current_trace) + goto out; + + /* + * We block until we read something and tracing is disabled. + * We still block if tracing is disabled, but we have never + * read anything. This allows a user to cat this file, and + * then enable tracing. But after we have read something, + * we give an EOF when tracing is again disabled. + * + * iter->pos will be 0 if we haven't read anything. + */ + if (!tracer_enabled && iter->pos) + break; + + continue; + } + + /* stop when tracing is finished */ + if (trace_empty(iter)) + goto out; + + if (cnt >= PAGE_SIZE) + cnt = PAGE_SIZE - 1; + + /* reset all but tr, trace, and overruns */ + memset(&iter->seq, 0, + sizeof(struct trace_iterator) - + offsetof(struct trace_iterator, seq)); + iter->pos = -1; + + /* + * We need to stop all tracing on all CPUS to read the + * the next buffer. This is a bit expensive, but is + * not done often. We fill all what we can read, + * and then release the locks again. + */ + + cpus_clear(mask); + local_irq_save(flags); +#ifdef CONFIG_FTRACE + ftrace_save = ftrace_enabled; + ftrace_enabled = 0; +#endif + smp_wmb(); + for_each_tracing_cpu(cpu) { + data = iter->tr->data[cpu]; + + if (!head_page(data) || !data->trace_idx) + continue; + + atomic_inc(&data->disabled); + cpu_set(cpu, mask); + } + + for_each_cpu_mask(cpu, mask) { + data = iter->tr->data[cpu]; + __raw_spin_lock(&data->lock); + + if (data->overrun > iter->last_overrun[cpu]) + iter->overrun[cpu] += + data->overrun - iter->last_overrun[cpu]; + iter->last_overrun[cpu] = data->overrun; + } + + while (find_next_entry_inc(iter) != NULL) { + int ret; + int len = iter->seq.len; + + ret = print_trace_line(iter); + if (!ret) { + /* don't print partial lines */ + iter->seq.len = len; + break; + } + + trace_consume(iter); + + if (iter->seq.len >= cnt) + break; + } + + for_each_cpu_mask(cpu, mask) { + data = iter->tr->data[cpu]; + __raw_spin_unlock(&data->lock); + } + + for_each_cpu_mask(cpu, mask) { + data = iter->tr->data[cpu]; + atomic_dec(&data->disabled); + } +#ifdef CONFIG_FTRACE + ftrace_enabled = ftrace_save; +#endif + local_irq_restore(flags); + + /* Now copy what we have to the user */ + sret = trace_seq_to_user(&iter->seq, ubuf, cnt); + if (iter->seq.readpos >= iter->seq.len) + trace_seq_reset(&iter->seq); + if (sret == -EBUSY) + sret = 0; + +out: + mutex_unlock(&trace_types_lock); + + return sret; +} + +static ssize_t +tracing_entries_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + struct trace_array *tr = filp->private_data; + char buf[64]; + int r; + + r = sprintf(buf, "%lu\n", tr->entries); + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); +} + +static ssize_t +tracing_entries_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + unsigned long val; + char buf[64]; + int i, ret; + + if (cnt >= sizeof(buf)) + return -EINVAL; + + if (copy_from_user(&buf, ubuf, cnt)) + return -EFAULT; + + buf[cnt] = 0; + + ret = strict_strtoul(buf, 10, &val); + if (ret < 0) + return ret; + + /* must have at least 1 entry */ + if (!val) + return -EINVAL; + + mutex_lock(&trace_types_lock); + + if (current_trace != &no_tracer) { + cnt = -EBUSY; + pr_info("ftrace: set current_tracer to none" + " before modifying buffer size\n"); + goto out; + } + + if (val > global_trace.entries) { + long pages_requested; + unsigned long freeable_pages; + + /* make sure we have enough memory before mapping */ + pages_requested = + (val + (ENTRIES_PER_PAGE-1)) / ENTRIES_PER_PAGE; + + /* account for each buffer (and max_tr) */ + pages_requested *= tracing_nr_buffers * 2; + + /* Check for overflow */ + if (pages_requested < 0) { + cnt = -ENOMEM; + goto out; + } + + freeable_pages = determine_dirtyable_memory(); + + /* we only allow to request 1/4 of useable memory */ + if (pages_requested > + ((freeable_pages + tracing_pages_allocated) / 4)) { + cnt = -ENOMEM; + goto out; + } + + while (global_trace.entries < val) { + if (trace_alloc_page()) { + cnt = -ENOMEM; + goto out; + } + /* double check that we don't go over the known pages */ + if (tracing_pages_allocated > pages_requested) + break; + } + + } else { + /* include the number of entries in val (inc of page entries) */ + while (global_trace.entries > val + (ENTRIES_PER_PAGE - 1)) + trace_free_page(); + } + + /* check integrity */ + for_each_tracing_cpu(i) + check_pages(global_trace.data[i]); + + filp->f_pos += cnt; + + /* If check pages failed, return ENOMEM */ + if (tracing_disabled) + cnt = -ENOMEM; + out: + max_tr.entries = global_trace.entries; + mutex_unlock(&trace_types_lock); + + return cnt; +} + +static struct file_operations tracing_max_lat_fops = { + .open = tracing_open_generic, + .read = tracing_max_lat_read, + .write = tracing_max_lat_write, +}; + +static struct file_operations tracing_ctrl_fops = { + .open = tracing_open_generic, + .read = tracing_ctrl_read, + .write = tracing_ctrl_write, +}; + +static struct file_operations set_tracer_fops = { + .open = tracing_open_generic, + .read = tracing_set_trace_read, + .write = tracing_set_trace_write, +}; + +static struct file_operations tracing_pipe_fops = { + .open = tracing_open_pipe, + .poll = tracing_poll_pipe, + .read = tracing_read_pipe, + .release = tracing_release_pipe, +}; + +static struct file_operations tracing_entries_fops = { + .open = tracing_open_generic, + .read = tracing_entries_read, + .write = tracing_entries_write, +}; + +#ifdef CONFIG_DYNAMIC_FTRACE + +static ssize_t +tracing_read_long(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + unsigned long *p = filp->private_data; + char buf[64]; + int r; + + r = sprintf(buf, "%ld\n", *p); + + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); +} + +static struct file_operations tracing_read_long_fops = { + .open = tracing_open_generic, + .read = tracing_read_long, +}; +#endif + +static struct dentry *d_tracer; + +struct dentry *tracing_init_dentry(void) +{ + static int once; + + if (d_tracer) + return d_tracer; + + d_tracer = debugfs_create_dir("tracing", NULL); + + if (!d_tracer && !once) { + once = 1; + pr_warning("Could not create debugfs directory 'tracing'\n"); + return NULL; + } + + return d_tracer; +} + +#ifdef CONFIG_FTRACE_SELFTEST +/* Let selftest have access to static functions in this file */ +#include "trace_selftest.c" +#endif + +static __init void tracer_init_debugfs(void) +{ + struct dentry *d_tracer; + struct dentry *entry; + + d_tracer = tracing_init_dentry(); + + entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, + &global_trace, &tracing_ctrl_fops); + if (!entry) + pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); + + entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, + NULL, &tracing_iter_fops); + if (!entry) + pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); + + entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, + NULL, &tracing_cpumask_fops); + if (!entry) + pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); + + entry = debugfs_create_file("latency_trace", 0444, d_tracer, + &global_trace, &tracing_lt_fops); + if (!entry) + pr_warning("Could not create debugfs 'latency_trace' entry\n"); + + entry = debugfs_create_file("trace", 0444, d_tracer, + &global_trace, &tracing_fops); + if (!entry) + pr_warning("Could not create debugfs 'trace' entry\n"); + + entry = debugfs_create_file("available_tracers", 0444, d_tracer, + &global_trace, &show_traces_fops); + if (!entry) + pr_warning("Could not create debugfs 'trace' entry\n"); + + entry = debugfs_create_file("current_tracer", 0444, d_tracer, + &global_trace, &set_tracer_fops); + if (!entry) + pr_warning("Could not create debugfs 'trace' entry\n"); + + entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, + &tracing_max_latency, + &tracing_max_lat_fops); + if (!entry) + pr_warning("Could not create debugfs " + "'tracing_max_latency' entry\n"); + + entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, + &tracing_thresh, &tracing_max_lat_fops); + if (!entry) + pr_warning("Could not create debugfs " + "'tracing_threash' entry\n"); + entry = debugfs_create_file("README", 0644, d_tracer, + NULL, &tracing_readme_fops); + if (!entry) + pr_warning("Could not create debugfs 'README' entry\n"); + + entry = debugfs_create_file("trace_pipe", 0644, d_tracer, + NULL, &tracing_pipe_fops); + if (!entry) + pr_warning("Could not create debugfs " + "'tracing_threash' entry\n"); + + entry = debugfs_create_file("trace_entries", 0644, d_tracer, + &global_trace, &tracing_entries_fops); + if (!entry) + pr_warning("Could not create debugfs " + "'tracing_threash' entry\n"); + +#ifdef CONFIG_DYNAMIC_FTRACE + entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, + &ftrace_update_tot_cnt, + &tracing_read_long_fops); + if (!entry) + pr_warning("Could not create debugfs " + "'dyn_ftrace_total_info' entry\n"); +#endif +} + +static int trace_alloc_page(void) +{ + struct trace_array_cpu *data; + struct page *page, *tmp; + LIST_HEAD(pages); + void *array; + unsigned pages_allocated = 0; + int i; + + /* first allocate a page for each CPU */ + for_each_tracing_cpu(i) { + array = (void *)__get_free_page(GFP_KERNEL); + if (array == NULL) { + printk(KERN_ERR "tracer: failed to allocate page" + "for trace buffer!\n"); + goto free_pages; + } + + pages_allocated++; + page = virt_to_page(array); + list_add(&page->lru, &pages); + +/* Only allocate if we are actually using the max trace */ +#ifdef CONFIG_TRACER_MAX_TRACE + array = (void *)__get_free_page(GFP_KERNEL); + if (array == NULL) { + printk(KERN_ERR "tracer: failed to allocate page" + "for trace buffer!\n"); + goto free_pages; + } + pages_allocated++; + page = virt_to_page(array); + list_add(&page->lru, &pages); +#endif + } + + /* Now that we successfully allocate a page per CPU, add them */ + for_each_tracing_cpu(i) { + data = global_trace.data[i]; + page = list_entry(pages.next, struct page, lru); + list_del_init(&page->lru); + list_add_tail(&page->lru, &data->trace_pages); + ClearPageLRU(page); + +#ifdef CONFIG_TRACER_MAX_TRACE + data = max_tr.data[i]; + page = list_entry(pages.next, struct page, lru); + list_del_init(&page->lru); + list_add_tail(&page->lru, &data->trace_pages); + SetPageLRU(page); +#endif + } + tracing_pages_allocated += pages_allocated; + global_trace.entries += ENTRIES_PER_PAGE; + + return 0; + + free_pages: + list_for_each_entry_safe(page, tmp, &pages, lru) { + list_del_init(&page->lru); + __free_page(page); + } + return -ENOMEM; +} + +static int trace_free_page(void) +{ + struct trace_array_cpu *data; + struct page *page; + struct list_head *p; + int i; + int ret = 0; + + /* free one page from each buffer */ + for_each_tracing_cpu(i) { + data = global_trace.data[i]; + p = data->trace_pages.next; + if (p == &data->trace_pages) { + /* should never happen */ + WARN_ON(1); + tracing_disabled = 1; + ret = -1; + break; + } + page = list_entry(p, struct page, lru); + ClearPageLRU(page); + list_del(&page->lru); + tracing_pages_allocated--; + tracing_pages_allocated--; + __free_page(page); + + tracing_reset(data); + +#ifdef CONFIG_TRACER_MAX_TRACE + data = max_tr.data[i]; + p = data->trace_pages.next; + if (p == &data->trace_pages) { + /* should never happen */ + WARN_ON(1); + tracing_disabled = 1; + ret = -1; + break; + } + page = list_entry(p, struct page, lru); + ClearPageLRU(page); + list_del(&page->lru); + __free_page(page); + + tracing_reset(data); +#endif + } + global_trace.entries -= ENTRIES_PER_PAGE; + + return ret; +} + +__init static int tracer_alloc_buffers(void) +{ + struct trace_array_cpu *data; + void *array; + struct page *page; + int pages = 0; + int ret = -ENOMEM; + int i; + + /* TODO: make the number of buffers hot pluggable with CPUS */ + tracing_nr_buffers = num_possible_cpus(); + tracing_buffer_mask = cpu_possible_map; + + /* Allocate the first page for all buffers */ + for_each_tracing_cpu(i) { + data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); + max_tr.data[i] = &per_cpu(max_data, i); + + array = (void *)__get_free_page(GFP_KERNEL); + if (array == NULL) { + printk(KERN_ERR "tracer: failed to allocate page" + "for trace buffer!\n"); + goto free_buffers; + } + + /* set the array to the list */ + INIT_LIST_HEAD(&data->trace_pages); + page = virt_to_page(array); + list_add(&page->lru, &data->trace_pages); + /* use the LRU flag to differentiate the two buffers */ + ClearPageLRU(page); + + data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; + max_tr.data[i]->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; + +/* Only allocate if we are actually using the max trace */ +#ifdef CONFIG_TRACER_MAX_TRACE + array = (void *)__get_free_page(GFP_KERNEL); + if (array == NULL) { + printk(KERN_ERR "tracer: failed to allocate page" + "for trace buffer!\n"); + goto free_buffers; + } + + INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); + page = virt_to_page(array); + list_add(&page->lru, &max_tr.data[i]->trace_pages); + SetPageLRU(page); +#endif + } + + /* + * Since we allocate by orders of pages, we may be able to + * round up a bit. + */ + global_trace.entries = ENTRIES_PER_PAGE; + pages++; + + while (global_trace.entries < trace_nr_entries) { + if (trace_alloc_page()) + break; + pages++; + } + max_tr.entries = global_trace.entries; + + pr_info("tracer: %d pages allocated for %ld entries of %ld bytes\n", + pages, trace_nr_entries, (long)TRACE_ENTRY_SIZE); + pr_info(" actual entries %ld\n", global_trace.entries); + + tracer_init_debugfs(); + + trace_init_cmdlines(); + + register_tracer(&no_tracer); + current_trace = &no_tracer; + + /* All seems OK, enable tracing */ + global_trace.ctrl = tracer_enabled; + tracing_disabled = 0; + + return 0; + + free_buffers: + for (i-- ; i >= 0; i--) { + struct page *page, *tmp; + struct trace_array_cpu *data = global_trace.data[i]; + + if (data) { + list_for_each_entry_safe(page, tmp, + &data->trace_pages, lru) { + list_del_init(&page->lru); + __free_page(page); + } + } + +#ifdef CONFIG_TRACER_MAX_TRACE + data = max_tr.data[i]; + if (data) { + list_for_each_entry_safe(page, tmp, + &data->trace_pages, lru) { + list_del_init(&page->lru); + __free_page(page); + } + } +#endif + } + return ret; +} +fs_initcall(tracer_alloc_buffers); Index: linux-2.6.26/kernel/trace/trace.h =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/trace.h @@ -0,0 +1,313 @@ +#ifndef _LINUX_KERNEL_TRACE_H +#define _LINUX_KERNEL_TRACE_H + +#include +#include +#include +#include + +enum trace_type { + __TRACE_FIRST_TYPE = 0, + + TRACE_FN, + TRACE_CTX, + TRACE_WAKE, + TRACE_STACK, + TRACE_SPECIAL, + + __TRACE_LAST_TYPE +}; + +/* + * Function trace entry - function address and parent function addres: + */ +struct ftrace_entry { + unsigned long ip; + unsigned long parent_ip; +}; + +/* + * Context switch trace entry - which task (and prio) we switched from/to: + */ +struct ctx_switch_entry { + unsigned int prev_pid; + unsigned char prev_prio; + unsigned char prev_state; + unsigned int next_pid; + unsigned char next_prio; + unsigned char next_state; +}; + +/* + * Special (free-form) trace entry: + */ +struct special_entry { + unsigned long arg1; + unsigned long arg2; + unsigned long arg3; +}; + +/* + * Stack-trace entry: + */ + +#define FTRACE_STACK_ENTRIES 8 + +struct stack_entry { + unsigned long caller[FTRACE_STACK_ENTRIES]; +}; + +/* + * The trace entry - the most basic unit of tracing. This is what + * is printed in the end as a single line in the trace output, such as: + * + * bash-15816 [01] 235.197585: idle_cpu <- irq_enter + */ +struct trace_entry { + char type; + char cpu; + char flags; + char preempt_count; + int pid; + cycle_t t; + union { + struct ftrace_entry fn; + struct ctx_switch_entry ctx; + struct special_entry special; + struct stack_entry stack; + }; +}; + +#define TRACE_ENTRY_SIZE sizeof(struct trace_entry) + +/* + * The CPU trace array - it consists of thousands of trace entries + * plus some other descriptor data: (for example which task started + * the trace, etc.) + */ +struct trace_array_cpu { + struct list_head trace_pages; + atomic_t disabled; + raw_spinlock_t lock; + struct lock_class_key lock_key; + + /* these fields get copied into max-trace: */ + unsigned trace_head_idx; + unsigned trace_tail_idx; + void *trace_head; /* producer */ + void *trace_tail; /* consumer */ + unsigned long trace_idx; + unsigned long overrun; + unsigned long saved_latency; + unsigned long critical_start; + unsigned long critical_end; + unsigned long critical_sequence; + unsigned long nice; + unsigned long policy; + unsigned long rt_priority; + cycle_t preempt_timestamp; + pid_t pid; + uid_t uid; + char comm[TASK_COMM_LEN]; +}; + +struct trace_iterator; + +/* + * The trace array - an array of per-CPU trace arrays. This is the + * highest level data structure that individual tracers deal with. + * They have on/off state as well: + */ +struct trace_array { + unsigned long entries; + long ctrl; + int cpu; + cycle_t time_start; + struct task_struct *waiter; + struct trace_array_cpu *data[NR_CPUS]; +}; + +/* + * A specific tracer, represented by methods that operate on a trace array: + */ +struct tracer { + const char *name; + void (*init)(struct trace_array *tr); + void (*reset)(struct trace_array *tr); + void (*open)(struct trace_iterator *iter); + void (*pipe_open)(struct trace_iterator *iter); + void (*close)(struct trace_iterator *iter); + void (*start)(struct trace_iterator *iter); + void (*stop)(struct trace_iterator *iter); + ssize_t (*read)(struct trace_iterator *iter, + struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos); + void (*ctrl_update)(struct trace_array *tr); +#ifdef CONFIG_FTRACE_STARTUP_TEST + int (*selftest)(struct tracer *trace, + struct trace_array *tr); +#endif + int (*print_line)(struct trace_iterator *iter); + struct tracer *next; + int print_max; +}; + +struct trace_seq { + unsigned char buffer[PAGE_SIZE]; + unsigned int len; + unsigned int readpos; +}; + +/* + * Trace iterator - used by printout routines who present trace + * results to users and which routines might sleep, etc: + */ +struct trace_iterator { + struct trace_array *tr; + struct tracer *trace; + void *private; + long last_overrun[NR_CPUS]; + long overrun[NR_CPUS]; + + /* The below is zeroed out in pipe_read */ + struct trace_seq seq; + struct trace_entry *ent; + int cpu; + + struct trace_entry *prev_ent; + int prev_cpu; + + unsigned long iter_flags; + loff_t pos; + unsigned long next_idx[NR_CPUS]; + struct list_head *next_page[NR_CPUS]; + unsigned next_page_idx[NR_CPUS]; + long idx; +}; + +void tracing_reset(struct trace_array_cpu *data); +int tracing_open_generic(struct inode *inode, struct file *filp); +struct dentry *tracing_init_dentry(void); +void ftrace(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long ip, + unsigned long parent_ip, + unsigned long flags); +void tracing_sched_switch_trace(struct trace_array *tr, + struct trace_array_cpu *data, + struct task_struct *prev, + struct task_struct *next, + unsigned long flags); +void tracing_record_cmdline(struct task_struct *tsk); + +void tracing_sched_wakeup_trace(struct trace_array *tr, + struct trace_array_cpu *data, + struct task_struct *wakee, + struct task_struct *cur, + unsigned long flags); +void trace_special(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long arg1, + unsigned long arg2, + unsigned long arg3); +void trace_function(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long ip, + unsigned long parent_ip, + unsigned long flags); + +void tracing_start_function_trace(void); +void tracing_stop_function_trace(void); +void tracing_start_cmdline_record(void); +void tracing_stop_cmdline_record(void); +int register_tracer(struct tracer *type); +void unregister_tracer(struct tracer *type); + +extern unsigned long nsecs_to_usecs(unsigned long nsecs); + +extern unsigned long tracing_max_latency; +extern unsigned long tracing_thresh; + +void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); +void update_max_tr_single(struct trace_array *tr, + struct task_struct *tsk, int cpu); + +extern cycle_t ftrace_now(int cpu); + +#ifdef CONFIG_CONTEXT_SWITCH_TRACER +typedef void +(*tracer_switch_func_t)(void *private, + void *__rq, + struct task_struct *prev, + struct task_struct *next); + +struct tracer_switch_ops { + tracer_switch_func_t func; + void *private; + struct tracer_switch_ops *next; +}; + +#endif /* CONFIG_CONTEXT_SWITCH_TRACER */ + +#ifdef CONFIG_DYNAMIC_FTRACE +extern unsigned long ftrace_update_tot_cnt; +#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func +extern int DYN_FTRACE_TEST_NAME(void); +#endif + +#ifdef CONFIG_FTRACE_STARTUP_TEST +#ifdef CONFIG_FTRACE +extern int trace_selftest_startup_function(struct tracer *trace, + struct trace_array *tr); +#endif +#ifdef CONFIG_IRQSOFF_TRACER +extern int trace_selftest_startup_irqsoff(struct tracer *trace, + struct trace_array *tr); +#endif +#ifdef CONFIG_PREEMPT_TRACER +extern int trace_selftest_startup_preemptoff(struct tracer *trace, + struct trace_array *tr); +#endif +#if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER) +extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, + struct trace_array *tr); +#endif +#ifdef CONFIG_SCHED_TRACER +extern int trace_selftest_startup_wakeup(struct tracer *trace, + struct trace_array *tr); +#endif +#ifdef CONFIG_CONTEXT_SWITCH_TRACER +extern int trace_selftest_startup_sched_switch(struct tracer *trace, + struct trace_array *tr); +#endif +#endif /* CONFIG_FTRACE_STARTUP_TEST */ + +extern void *head_page(struct trace_array_cpu *data); +extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...); +extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, + size_t cnt); +extern long ns2usecs(cycle_t nsec); + +extern unsigned long trace_flags; + +/* + * trace_iterator_flags is an enumeration that defines bit + * positions into trace_flags that controls the output. + * + * NOTE: These bits must match the trace_options array in + * trace.c. + */ +enum trace_iterator_flags { + TRACE_ITER_PRINT_PARENT = 0x01, + TRACE_ITER_SYM_OFFSET = 0x02, + TRACE_ITER_SYM_ADDR = 0x04, + TRACE_ITER_VERBOSE = 0x08, + TRACE_ITER_RAW = 0x10, + TRACE_ITER_HEX = 0x20, + TRACE_ITER_BIN = 0x40, + TRACE_ITER_BLOCK = 0x80, + TRACE_ITER_STACKTRACE = 0x100, + TRACE_ITER_SCHED_TREE = 0x200, +}; + +#endif /* _LINUX_KERNEL_TRACE_H */ Index: linux-2.6.26/kernel/trace/trace_functions.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/trace_functions.c @@ -0,0 +1,78 @@ +/* + * ring buffer based function tracer + * + * Copyright (C) 2007-2008 Steven Rostedt + * Copyright (C) 2008 Ingo Molnar + * + * Based on code from the latency_tracer, that is: + * + * Copyright (C) 2004-2006 Ingo Molnar + * Copyright (C) 2004 William Lee Irwin III + */ +#include +#include +#include +#include + +#include "trace.h" + +static void function_reset(struct trace_array *tr) +{ + int cpu; + + tr->time_start = ftrace_now(tr->cpu); + + for_each_online_cpu(cpu) + tracing_reset(tr->data[cpu]); +} + +static void start_function_trace(struct trace_array *tr) +{ + function_reset(tr); + tracing_start_cmdline_record(); + tracing_start_function_trace(); +} + +static void stop_function_trace(struct trace_array *tr) +{ + tracing_stop_function_trace(); + tracing_stop_cmdline_record(); +} + +static void function_trace_init(struct trace_array *tr) +{ + if (tr->ctrl) + start_function_trace(tr); +} + +static void function_trace_reset(struct trace_array *tr) +{ + if (tr->ctrl) + stop_function_trace(tr); +} + +static void function_trace_ctrl_update(struct trace_array *tr) +{ + if (tr->ctrl) + start_function_trace(tr); + else + stop_function_trace(tr); +} + +static struct tracer function_trace __read_mostly = +{ + .name = "ftrace", + .init = function_trace_init, + .reset = function_trace_reset, + .ctrl_update = function_trace_ctrl_update, +#ifdef CONFIG_FTRACE_SELFTEST + .selftest = trace_selftest_startup_function, +#endif +}; + +static __init int init_function_trace(void) +{ + return register_tracer(&function_trace); +} + +device_initcall(init_function_trace); Index: linux-2.6.26/kernel/trace/trace_irqsoff.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/trace_irqsoff.c @@ -0,0 +1,486 @@ +/* + * trace irqs off criticall timings + * + * Copyright (C) 2007-2008 Steven Rostedt + * Copyright (C) 2008 Ingo Molnar + * + * From code in the latency_tracer, that is: + * + * Copyright (C) 2004-2006 Ingo Molnar + * Copyright (C) 2004 William Lee Irwin III + */ +#include +#include +#include +#include +#include +#include + +#include "trace.h" + +static struct trace_array *irqsoff_trace __read_mostly; +static int tracer_enabled __read_mostly; + +static DEFINE_PER_CPU(int, tracing_cpu); + +static DEFINE_SPINLOCK(max_trace_lock); + +enum { + TRACER_IRQS_OFF = (1 << 1), + TRACER_PREEMPT_OFF = (1 << 2), +}; + +static int trace_type __read_mostly; + +#ifdef CONFIG_PREEMPT_TRACER +static inline int +preempt_trace(void) +{ + return ((trace_type & TRACER_PREEMPT_OFF) && preempt_count()); +} +#else +# define preempt_trace() (0) +#endif + +#ifdef CONFIG_IRQSOFF_TRACER +static inline int +irq_trace(void) +{ + return ((trace_type & TRACER_IRQS_OFF) && + irqs_disabled()); +} +#else +# define irq_trace() (0) +#endif + +/* + * Sequence count - we record it when starting a measurement and + * skip the latency if the sequence has changed - some other section + * did a maximum and could disturb our measurement with serial console + * printouts, etc. Truly coinciding maximum latencies should be rare + * and what happens together happens separately as well, so this doesnt + * decrease the validity of the maximum found: + */ +static __cacheline_aligned_in_smp unsigned long max_sequence; + +#ifdef CONFIG_FTRACE +/* + * irqsoff uses its own tracer function to keep the overhead down: + */ +static void +irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip) +{ + struct trace_array *tr = irqsoff_trace; + struct trace_array_cpu *data; + unsigned long flags; + long disabled; + int cpu; + + /* + * Does not matter if we preempt. We test the flags + * afterward, to see if irqs are disabled or not. + * If we preempt and get a false positive, the flags + * test will fail. + */ + cpu = raw_smp_processor_id(); + if (likely(!per_cpu(tracing_cpu, cpu))) + return; + + local_save_flags(flags); + /* slight chance to get a false positive on tracing_cpu */ + if (!irqs_disabled_flags(flags)) + return; + + data = tr->data[cpu]; + disabled = atomic_inc_return(&data->disabled); + + if (likely(disabled == 1)) + trace_function(tr, data, ip, parent_ip, flags); + + atomic_dec(&data->disabled); +} + +static struct ftrace_ops trace_ops __read_mostly = +{ + .func = irqsoff_tracer_call, +}; +#endif /* CONFIG_FTRACE */ + +/* + * Should this new latency be reported/recorded? + */ +static int report_latency(cycle_t delta) +{ + if (tracing_thresh) { + if (delta < tracing_thresh) + return 0; + } else { + if (delta <= tracing_max_latency) + return 0; + } + return 1; +} + +static void +check_critical_timing(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long parent_ip, + int cpu) +{ + unsigned long latency, t0, t1; + cycle_t T0, T1, delta; + unsigned long flags; + + /* + * usecs conversion is slow so we try to delay the conversion + * as long as possible: + */ + T0 = data->preempt_timestamp; + T1 = ftrace_now(cpu); + delta = T1-T0; + + local_save_flags(flags); + + if (!report_latency(delta)) + goto out; + + spin_lock_irqsave(&max_trace_lock, flags); + + /* check if we are still the max latency */ + if (!report_latency(delta)) + goto out_unlock; + + trace_function(tr, data, CALLER_ADDR0, parent_ip, flags); + + latency = nsecs_to_usecs(delta); + + if (data->critical_sequence != max_sequence) + goto out_unlock; + + tracing_max_latency = delta; + t0 = nsecs_to_usecs(T0); + t1 = nsecs_to_usecs(T1); + + data->critical_end = parent_ip; + + update_max_tr_single(tr, current, cpu); + + max_sequence++; + +out_unlock: + spin_unlock_irqrestore(&max_trace_lock, flags); + +out: + data->critical_sequence = max_sequence; + data->preempt_timestamp = ftrace_now(cpu); + tracing_reset(data); + trace_function(tr, data, CALLER_ADDR0, parent_ip, flags); +} + +static inline void +start_critical_timing(unsigned long ip, unsigned long parent_ip) +{ + int cpu; + struct trace_array *tr = irqsoff_trace; + struct trace_array_cpu *data; + unsigned long flags; + + if (likely(!tracer_enabled)) + return; + + cpu = raw_smp_processor_id(); + + if (per_cpu(tracing_cpu, cpu)) + return; + + data = tr->data[cpu]; + + if (unlikely(!data) || atomic_read(&data->disabled)) + return; + + atomic_inc(&data->disabled); + + data->critical_sequence = max_sequence; + data->preempt_timestamp = ftrace_now(cpu); + data->critical_start = parent_ip ? : ip; + tracing_reset(data); + + local_save_flags(flags); + + trace_function(tr, data, ip, parent_ip, flags); + + per_cpu(tracing_cpu, cpu) = 1; + + atomic_dec(&data->disabled); +} + +static inline void +stop_critical_timing(unsigned long ip, unsigned long parent_ip) +{ + int cpu; + struct trace_array *tr = irqsoff_trace; + struct trace_array_cpu *data; + unsigned long flags; + + cpu = raw_smp_processor_id(); + /* Always clear the tracing cpu on stopping the trace */ + if (unlikely(per_cpu(tracing_cpu, cpu))) + per_cpu(tracing_cpu, cpu) = 0; + else + return; + + if (!tracer_enabled) + return; + + data = tr->data[cpu]; + + if (unlikely(!data) || unlikely(!head_page(data)) || + !data->critical_start || atomic_read(&data->disabled)) + return; + + atomic_inc(&data->disabled); + + local_save_flags(flags); + trace_function(tr, data, ip, parent_ip, flags); + check_critical_timing(tr, data, parent_ip ? : ip, cpu); + data->critical_start = 0; + atomic_dec(&data->disabled); +} + +/* start and stop critical timings used to for stoppage (in idle) */ +void start_critical_timings(void) +{ + if (preempt_trace() || irq_trace()) + start_critical_timing(CALLER_ADDR0, CALLER_ADDR1); +} + +void stop_critical_timings(void) +{ + if (preempt_trace() || irq_trace()) + stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1); +} + +#ifdef CONFIG_IRQSOFF_TRACER +#ifdef CONFIG_PROVE_LOCKING +void time_hardirqs_on(unsigned long a0, unsigned long a1) +{ + if (!preempt_trace() && irq_trace()) + stop_critical_timing(a0, a1); +} + +void time_hardirqs_off(unsigned long a0, unsigned long a1) +{ + if (!preempt_trace() && irq_trace()) + start_critical_timing(a0, a1); +} + +#else /* !CONFIG_PROVE_LOCKING */ + +/* + * Stubs: + */ + +void early_boot_irqs_off(void) +{ +} + +void early_boot_irqs_on(void) +{ +} + +void trace_softirqs_on(unsigned long ip) +{ +} + +void trace_softirqs_off(unsigned long ip) +{ +} + +inline void print_irqtrace_events(struct task_struct *curr) +{ +} + +/* + * We are only interested in hardirq on/off events: + */ +void trace_hardirqs_on(void) +{ + if (!preempt_trace() && irq_trace()) + stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1); +} +EXPORT_SYMBOL(trace_hardirqs_on); + +void trace_hardirqs_off(void) +{ + if (!preempt_trace() && irq_trace()) + start_critical_timing(CALLER_ADDR0, CALLER_ADDR1); +} +EXPORT_SYMBOL(trace_hardirqs_off); + +void trace_hardirqs_on_caller(unsigned long caller_addr) +{ + if (!preempt_trace() && irq_trace()) + stop_critical_timing(CALLER_ADDR0, caller_addr); +} +EXPORT_SYMBOL(trace_hardirqs_on_caller); + +void trace_hardirqs_off_caller(unsigned long caller_addr) +{ + if (!preempt_trace() && irq_trace()) + start_critical_timing(CALLER_ADDR0, caller_addr); +} +EXPORT_SYMBOL(trace_hardirqs_off_caller); + +#endif /* CONFIG_PROVE_LOCKING */ +#endif /* CONFIG_IRQSOFF_TRACER */ + +#ifdef CONFIG_PREEMPT_TRACER +void trace_preempt_on(unsigned long a0, unsigned long a1) +{ + stop_critical_timing(a0, a1); +} + +void trace_preempt_off(unsigned long a0, unsigned long a1) +{ + start_critical_timing(a0, a1); +} +#endif /* CONFIG_PREEMPT_TRACER */ + +static void start_irqsoff_tracer(struct trace_array *tr) +{ + register_ftrace_function(&trace_ops); + tracer_enabled = 1; +} + +static void stop_irqsoff_tracer(struct trace_array *tr) +{ + tracer_enabled = 0; + unregister_ftrace_function(&trace_ops); +} + +static void __irqsoff_tracer_init(struct trace_array *tr) +{ + irqsoff_trace = tr; + /* make sure that the tracer is visible */ + smp_wmb(); + + if (tr->ctrl) + start_irqsoff_tracer(tr); +} + +static void irqsoff_tracer_reset(struct trace_array *tr) +{ + if (tr->ctrl) + stop_irqsoff_tracer(tr); +} + +static void irqsoff_tracer_ctrl_update(struct trace_array *tr) +{ + if (tr->ctrl) + start_irqsoff_tracer(tr); + else + stop_irqsoff_tracer(tr); +} + +static void irqsoff_tracer_open(struct trace_iterator *iter) +{ + /* stop the trace while dumping */ + if (iter->tr->ctrl) + stop_irqsoff_tracer(iter->tr); +} + +static void irqsoff_tracer_close(struct trace_iterator *iter) +{ + if (iter->tr->ctrl) + start_irqsoff_tracer(iter->tr); +} + +#ifdef CONFIG_IRQSOFF_TRACER +static void irqsoff_tracer_init(struct trace_array *tr) +{ + trace_type = TRACER_IRQS_OFF; + + __irqsoff_tracer_init(tr); +} +static struct tracer irqsoff_tracer __read_mostly = +{ + .name = "irqsoff", + .init = irqsoff_tracer_init, + .reset = irqsoff_tracer_reset, + .open = irqsoff_tracer_open, + .close = irqsoff_tracer_close, + .ctrl_update = irqsoff_tracer_ctrl_update, + .print_max = 1, +#ifdef CONFIG_FTRACE_SELFTEST + .selftest = trace_selftest_startup_irqsoff, +#endif +}; +# define register_irqsoff(trace) register_tracer(&trace) +#else +# define register_irqsoff(trace) do { } while (0) +#endif + +#ifdef CONFIG_PREEMPT_TRACER +static void preemptoff_tracer_init(struct trace_array *tr) +{ + trace_type = TRACER_PREEMPT_OFF; + + __irqsoff_tracer_init(tr); +} + +static struct tracer preemptoff_tracer __read_mostly = +{ + .name = "preemptoff", + .init = preemptoff_tracer_init, + .reset = irqsoff_tracer_reset, + .open = irqsoff_tracer_open, + .close = irqsoff_tracer_close, + .ctrl_update = irqsoff_tracer_ctrl_update, + .print_max = 1, +#ifdef CONFIG_FTRACE_SELFTEST + .selftest = trace_selftest_startup_preemptoff, +#endif +}; +# define register_preemptoff(trace) register_tracer(&trace) +#else +# define register_preemptoff(trace) do { } while (0) +#endif + +#if defined(CONFIG_IRQSOFF_TRACER) && \ + defined(CONFIG_PREEMPT_TRACER) + +static void preemptirqsoff_tracer_init(struct trace_array *tr) +{ + trace_type = TRACER_IRQS_OFF | TRACER_PREEMPT_OFF; + + __irqsoff_tracer_init(tr); +} + +static struct tracer preemptirqsoff_tracer __read_mostly = +{ + .name = "preemptirqsoff", + .init = preemptirqsoff_tracer_init, + .reset = irqsoff_tracer_reset, + .open = irqsoff_tracer_open, + .close = irqsoff_tracer_close, + .ctrl_update = irqsoff_tracer_ctrl_update, + .print_max = 1, +#ifdef CONFIG_FTRACE_SELFTEST + .selftest = trace_selftest_startup_preemptirqsoff, +#endif +}; + +# define register_preemptirqsoff(trace) register_tracer(&trace) +#else +# define register_preemptirqsoff(trace) do { } while (0) +#endif + +__init static int init_irqsoff_tracer(void) +{ + register_irqsoff(irqsoff_tracer); + register_preemptoff(preemptoff_tracer); + register_preemptirqsoff(preemptirqsoff_tracer); + + return 0; +} +device_initcall(init_irqsoff_tracer); Index: linux-2.6.26/kernel/trace/trace_sched_switch.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/trace_sched_switch.c @@ -0,0 +1,286 @@ +/* + * trace context switch + * + * Copyright (C) 2007 Steven Rostedt + * + */ +#include +#include +#include +#include +#include +#include +#include + +#include "trace.h" + +static struct trace_array *ctx_trace; +static int __read_mostly tracer_enabled; +static atomic_t sched_ref; + +static void +sched_switch_func(void *private, void *__rq, struct task_struct *prev, + struct task_struct *next) +{ + struct trace_array **ptr = private; + struct trace_array *tr = *ptr; + struct trace_array_cpu *data; + unsigned long flags; + long disabled; + int cpu; + + tracing_record_cmdline(prev); + tracing_record_cmdline(next); + + if (!tracer_enabled) + return; + + local_irq_save(flags); + cpu = raw_smp_processor_id(); + data = tr->data[cpu]; + disabled = atomic_inc_return(&data->disabled); + + if (likely(disabled == 1)) + tracing_sched_switch_trace(tr, data, prev, next, flags); + + atomic_dec(&data->disabled); + local_irq_restore(flags); +} + +static notrace void +sched_switch_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct task_struct *prev; + struct task_struct *next; + struct rq *__rq; + + if (!atomic_read(&sched_ref)) + return; + + /* skip prev_pid %d next_pid %d prev_state %ld */ + (void)va_arg(*args, int); + (void)va_arg(*args, int); + (void)va_arg(*args, long); + __rq = va_arg(*args, typeof(__rq)); + prev = va_arg(*args, typeof(prev)); + next = va_arg(*args, typeof(next)); + + /* + * If tracer_switch_func only points to the local + * switch func, it still needs the ptr passed to it. + */ + sched_switch_func(probe_data, __rq, prev, next); +} + +static void +wakeup_func(void *private, void *__rq, struct task_struct *wakee, struct + task_struct *curr) +{ + struct trace_array **ptr = private; + struct trace_array *tr = *ptr; + struct trace_array_cpu *data; + unsigned long flags; + long disabled; + int cpu; + + if (!tracer_enabled) + return; + + tracing_record_cmdline(curr); + + local_irq_save(flags); + cpu = raw_smp_processor_id(); + data = tr->data[cpu]; + disabled = atomic_inc_return(&data->disabled); + + if (likely(disabled == 1)) + tracing_sched_wakeup_trace(tr, data, wakee, curr, flags); + + atomic_dec(&data->disabled); + local_irq_restore(flags); +} + +static notrace void +wake_up_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct task_struct *curr; + struct task_struct *task; + struct rq *__rq; + + if (likely(!tracer_enabled)) + return; + + /* Skip pid %d state %ld */ + (void)va_arg(*args, int); + (void)va_arg(*args, long); + /* now get the meat: "rq %p task %p rq->curr %p" */ + __rq = va_arg(*args, typeof(__rq)); + task = va_arg(*args, typeof(task)); + curr = va_arg(*args, typeof(curr)); + + tracing_record_cmdline(task); + tracing_record_cmdline(curr); + + wakeup_func(probe_data, __rq, task, curr); +} + +static void sched_switch_reset(struct trace_array *tr) +{ + int cpu; + + tr->time_start = ftrace_now(tr->cpu); + + for_each_online_cpu(cpu) + tracing_reset(tr->data[cpu]); +} + +static int tracing_sched_register(void) +{ + int ret; + + ret = marker_probe_register("kernel_sched_wakeup", + "pid %d state %ld ## rq %p task %p rq->curr %p", + wake_up_callback, + &ctx_trace); + if (ret) { + pr_info("wakeup trace: Couldn't add marker" + " probe to kernel_sched_wakeup\n"); + return ret; + } + + ret = marker_probe_register("kernel_sched_wakeup_new", + "pid %d state %ld ## rq %p task %p rq->curr %p", + wake_up_callback, + &ctx_trace); + if (ret) { + pr_info("wakeup trace: Couldn't add marker" + " probe to kernel_sched_wakeup_new\n"); + goto fail_deprobe; + } + + ret = marker_probe_register("kernel_sched_schedule", + "prev_pid %d next_pid %d prev_state %ld " + "## rq %p prev %p next %p", + sched_switch_callback, + &ctx_trace); + if (ret) { + pr_info("sched trace: Couldn't add marker" + " probe to kernel_sched_schedule\n"); + goto fail_deprobe_wake_new; + } + + return ret; +fail_deprobe_wake_new: + marker_probe_unregister("kernel_sched_wakeup_new", + wake_up_callback, + &ctx_trace); +fail_deprobe: + marker_probe_unregister("kernel_sched_wakeup", + wake_up_callback, + &ctx_trace); + return ret; +} + +static void tracing_sched_unregister(void) +{ + marker_probe_unregister("kernel_sched_schedule", + sched_switch_callback, + &ctx_trace); + marker_probe_unregister("kernel_sched_wakeup_new", + wake_up_callback, + &ctx_trace); + marker_probe_unregister("kernel_sched_wakeup", + wake_up_callback, + &ctx_trace); +} + +static void tracing_start_sched_switch(void) +{ + long ref; + + ref = atomic_inc_return(&sched_ref); + if (ref == 1) + tracing_sched_register(); +} + +static void tracing_stop_sched_switch(void) +{ + long ref; + + ref = atomic_dec_and_test(&sched_ref); + if (ref) + tracing_sched_unregister(); +} + +void tracing_start_cmdline_record(void) +{ + tracing_start_sched_switch(); +} + +void tracing_stop_cmdline_record(void) +{ + tracing_stop_sched_switch(); +} + +static void start_sched_trace(struct trace_array *tr) +{ + sched_switch_reset(tr); + tracer_enabled = 1; + tracing_start_cmdline_record(); +} + +static void stop_sched_trace(struct trace_array *tr) +{ + tracing_stop_cmdline_record(); + tracer_enabled = 0; +} + +static void sched_switch_trace_init(struct trace_array *tr) +{ + ctx_trace = tr; + + if (tr->ctrl) + start_sched_trace(tr); +} + +static void sched_switch_trace_reset(struct trace_array *tr) +{ + if (tr->ctrl) + stop_sched_trace(tr); +} + +static void sched_switch_trace_ctrl_update(struct trace_array *tr) +{ + /* When starting a new trace, reset the buffers */ + if (tr->ctrl) + start_sched_trace(tr); + else + stop_sched_trace(tr); +} + +static struct tracer sched_switch_trace __read_mostly = +{ + .name = "sched_switch", + .init = sched_switch_trace_init, + .reset = sched_switch_trace_reset, + .ctrl_update = sched_switch_trace_ctrl_update, +#ifdef CONFIG_FTRACE_SELFTEST + .selftest = trace_selftest_startup_sched_switch, +#endif +}; + +__init static int init_sched_switch_trace(void) +{ + int ret = 0; + + if (atomic_read(&sched_ref)) + ret = tracing_sched_register(); + if (ret) { + pr_info("error registering scheduler trace\n"); + return ret; + } + return register_tracer(&sched_switch_trace); +} +device_initcall(init_sched_switch_trace); Index: linux-2.6.26/kernel/trace/trace_sched_wakeup.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/trace_sched_wakeup.c @@ -0,0 +1,447 @@ +/* + * trace task wakeup timings + * + * Copyright (C) 2007-2008 Steven Rostedt + * Copyright (C) 2008 Ingo Molnar + * + * Based on code from the latency_tracer, that is: + * + * Copyright (C) 2004-2006 Ingo Molnar + * Copyright (C) 2004 William Lee Irwin III + */ +#include +#include +#include +#include +#include +#include +#include + +#include "trace.h" + +static struct trace_array *wakeup_trace; +static int __read_mostly tracer_enabled; + +static struct task_struct *wakeup_task; +static int wakeup_cpu; +static unsigned wakeup_prio = -1; + +static DEFINE_SPINLOCK(wakeup_lock); + +static void __wakeup_reset(struct trace_array *tr); + +#ifdef CONFIG_FTRACE +/* + * irqsoff uses its own tracer function to keep the overhead down: + */ +static void +wakeup_tracer_call(unsigned long ip, unsigned long parent_ip) +{ + struct trace_array *tr = wakeup_trace; + struct trace_array_cpu *data; + unsigned long flags; + long disabled; + int resched; + int cpu; + + if (likely(!wakeup_task)) + return; + + resched = need_resched(); + preempt_disable_notrace(); + + cpu = raw_smp_processor_id(); + data = tr->data[cpu]; + disabled = atomic_inc_return(&data->disabled); + if (unlikely(disabled != 1)) + goto out; + + spin_lock_irqsave(&wakeup_lock, flags); + + if (unlikely(!wakeup_task)) + goto unlock; + + /* + * The task can't disappear because it needs to + * wake up first, and we have the wakeup_lock. + */ + if (task_cpu(wakeup_task) != cpu) + goto unlock; + + trace_function(tr, data, ip, parent_ip, flags); + + unlock: + spin_unlock_irqrestore(&wakeup_lock, flags); + + out: + atomic_dec(&data->disabled); + + /* + * To prevent recursion from the scheduler, if the + * resched flag was set before we entered, then + * don't reschedule. + */ + if (resched) + preempt_enable_no_resched_notrace(); + else + preempt_enable_notrace(); +} + +static struct ftrace_ops trace_ops __read_mostly = +{ + .func = wakeup_tracer_call, +}; +#endif /* CONFIG_FTRACE */ + +/* + * Should this new latency be reported/recorded? + */ +static int report_latency(cycle_t delta) +{ + if (tracing_thresh) { + if (delta < tracing_thresh) + return 0; + } else { + if (delta <= tracing_max_latency) + return 0; + } + return 1; +} + +static void notrace +wakeup_sched_switch(void *private, void *rq, struct task_struct *prev, + struct task_struct *next) +{ + unsigned long latency = 0, t0 = 0, t1 = 0; + struct trace_array **ptr = private; + struct trace_array *tr = *ptr; + struct trace_array_cpu *data; + cycle_t T0, T1, delta; + unsigned long flags; + long disabled; + int cpu; + + if (unlikely(!tracer_enabled)) + return; + + /* + * When we start a new trace, we set wakeup_task to NULL + * and then set tracer_enabled = 1. We want to make sure + * that another CPU does not see the tracer_enabled = 1 + * and the wakeup_task with an older task, that might + * actually be the same as next. + */ + smp_rmb(); + + if (next != wakeup_task) + return; + + /* The task we are waiting for is waking up */ + data = tr->data[wakeup_cpu]; + + /* disable local data, not wakeup_cpu data */ + cpu = raw_smp_processor_id(); + disabled = atomic_inc_return(&tr->data[cpu]->disabled); + if (likely(disabled != 1)) + goto out; + + spin_lock_irqsave(&wakeup_lock, flags); + + /* We could race with grabbing wakeup_lock */ + if (unlikely(!tracer_enabled || next != wakeup_task)) + goto out_unlock; + + trace_function(tr, data, CALLER_ADDR1, CALLER_ADDR2, flags); + + /* + * usecs conversion is slow so we try to delay the conversion + * as long as possible: + */ + T0 = data->preempt_timestamp; + T1 = ftrace_now(cpu); + delta = T1-T0; + + if (!report_latency(delta)) + goto out_unlock; + + latency = nsecs_to_usecs(delta); + + tracing_max_latency = delta; + t0 = nsecs_to_usecs(T0); + t1 = nsecs_to_usecs(T1); + + update_max_tr(tr, wakeup_task, wakeup_cpu); + +out_unlock: + __wakeup_reset(tr); + spin_unlock_irqrestore(&wakeup_lock, flags); +out: + atomic_dec(&tr->data[cpu]->disabled); +} + +static notrace void +sched_switch_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct task_struct *prev; + struct task_struct *next; + struct rq *__rq; + + /* skip prev_pid %d next_pid %d prev_state %ld */ + (void)va_arg(*args, int); + (void)va_arg(*args, int); + (void)va_arg(*args, long); + __rq = va_arg(*args, typeof(__rq)); + prev = va_arg(*args, typeof(prev)); + next = va_arg(*args, typeof(next)); + + tracing_record_cmdline(prev); + + /* + * If tracer_switch_func only points to the local + * switch func, it still needs the ptr passed to it. + */ + wakeup_sched_switch(probe_data, __rq, prev, next); +} + +static void __wakeup_reset(struct trace_array *tr) +{ + struct trace_array_cpu *data; + int cpu; + + assert_spin_locked(&wakeup_lock); + + for_each_possible_cpu(cpu) { + data = tr->data[cpu]; + tracing_reset(data); + } + + wakeup_cpu = -1; + wakeup_prio = -1; + + if (wakeup_task) + put_task_struct(wakeup_task); + + wakeup_task = NULL; +} + +static void wakeup_reset(struct trace_array *tr) +{ + unsigned long flags; + + spin_lock_irqsave(&wakeup_lock, flags); + __wakeup_reset(tr); + spin_unlock_irqrestore(&wakeup_lock, flags); +} + +static void +wakeup_check_start(struct trace_array *tr, struct task_struct *p, + struct task_struct *curr) +{ + int cpu = smp_processor_id(); + unsigned long flags; + long disabled; + + if (likely(!rt_task(p)) || + p->prio >= wakeup_prio || + p->prio >= curr->prio) + return; + + disabled = atomic_inc_return(&tr->data[cpu]->disabled); + if (unlikely(disabled != 1)) + goto out; + + /* interrupts should be off from try_to_wake_up */ + spin_lock(&wakeup_lock); + + /* check for races. */ + if (!tracer_enabled || p->prio >= wakeup_prio) + goto out_locked; + + /* reset the trace */ + __wakeup_reset(tr); + + wakeup_cpu = task_cpu(p); + wakeup_prio = p->prio; + + wakeup_task = p; + get_task_struct(wakeup_task); + + local_save_flags(flags); + + tr->data[wakeup_cpu]->preempt_timestamp = ftrace_now(cpu); + trace_function(tr, tr->data[wakeup_cpu], + CALLER_ADDR1, CALLER_ADDR2, flags); + +out_locked: + spin_unlock(&wakeup_lock); +out: + atomic_dec(&tr->data[cpu]->disabled); +} + +static notrace void +wake_up_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct trace_array **ptr = probe_data; + struct trace_array *tr = *ptr; + struct task_struct *curr; + struct task_struct *task; + struct rq *__rq; + + if (likely(!tracer_enabled)) + return; + + /* Skip pid %d state %ld */ + (void)va_arg(*args, int); + (void)va_arg(*args, long); + /* now get the meat: "rq %p task %p rq->curr %p" */ + __rq = va_arg(*args, typeof(__rq)); + task = va_arg(*args, typeof(task)); + curr = va_arg(*args, typeof(curr)); + + tracing_record_cmdline(task); + tracing_record_cmdline(curr); + + wakeup_check_start(tr, task, curr); +} + +static void start_wakeup_tracer(struct trace_array *tr) +{ + int ret; + + ret = marker_probe_register("kernel_sched_wakeup", + "pid %d state %ld ## rq %p task %p rq->curr %p", + wake_up_callback, + &wakeup_trace); + if (ret) { + pr_info("wakeup trace: Couldn't add marker" + " probe to kernel_sched_wakeup\n"); + return; + } + + ret = marker_probe_register("kernel_sched_wakeup_new", + "pid %d state %ld ## rq %p task %p rq->curr %p", + wake_up_callback, + &wakeup_trace); + if (ret) { + pr_info("wakeup trace: Couldn't add marker" + " probe to kernel_sched_wakeup_new\n"); + goto fail_deprobe; + } + + ret = marker_probe_register("kernel_sched_schedule", + "prev_pid %d next_pid %d prev_state %ld " + "## rq %p prev %p next %p", + sched_switch_callback, + &wakeup_trace); + if (ret) { + pr_info("sched trace: Couldn't add marker" + " probe to kernel_sched_schedule\n"); + goto fail_deprobe_wake_new; + } + + wakeup_reset(tr); + + /* + * Don't let the tracer_enabled = 1 show up before + * the wakeup_task is reset. This may be overkill since + * wakeup_reset does a spin_unlock after setting the + * wakeup_task to NULL, but I want to be safe. + * This is a slow path anyway. + */ + smp_wmb(); + + tracer_enabled = 1; + register_ftrace_function(&trace_ops); + + return; +fail_deprobe_wake_new: + marker_probe_unregister("kernel_sched_wakeup_new", + wake_up_callback, + &wakeup_trace); +fail_deprobe: + marker_probe_unregister("kernel_sched_wakeup", + wake_up_callback, + &wakeup_trace); +} + +static void stop_wakeup_tracer(struct trace_array *tr) +{ + tracer_enabled = 0; + unregister_ftrace_function(&trace_ops); + marker_probe_unregister("kernel_sched_schedule", + sched_switch_callback, + &wakeup_trace); + marker_probe_unregister("kernel_sched_wakeup_new", + wake_up_callback, + &wakeup_trace); + marker_probe_unregister("kernel_sched_wakeup", + wake_up_callback, + &wakeup_trace); +} + +static void wakeup_tracer_init(struct trace_array *tr) +{ + wakeup_trace = tr; + + if (tr->ctrl) + start_wakeup_tracer(tr); +} + +static void wakeup_tracer_reset(struct trace_array *tr) +{ + if (tr->ctrl) { + stop_wakeup_tracer(tr); + /* make sure we put back any tasks we are tracing */ + wakeup_reset(tr); + } +} + +static void wakeup_tracer_ctrl_update(struct trace_array *tr) +{ + if (tr->ctrl) + start_wakeup_tracer(tr); + else + stop_wakeup_tracer(tr); +} + +static void wakeup_tracer_open(struct trace_iterator *iter) +{ + /* stop the trace while dumping */ + if (iter->tr->ctrl) + stop_wakeup_tracer(iter->tr); +} + +static void wakeup_tracer_close(struct trace_iterator *iter) +{ + /* forget about any processes we were recording */ + if (iter->tr->ctrl) + start_wakeup_tracer(iter->tr); +} + +static struct tracer wakeup_tracer __read_mostly = +{ + .name = "wakeup", + .init = wakeup_tracer_init, + .reset = wakeup_tracer_reset, + .open = wakeup_tracer_open, + .close = wakeup_tracer_close, + .ctrl_update = wakeup_tracer_ctrl_update, + .print_max = 1, +#ifdef CONFIG_FTRACE_SELFTEST + .selftest = trace_selftest_startup_wakeup, +#endif +}; + +__init static int init_wakeup_tracer(void) +{ + int ret; + + ret = register_tracer(&wakeup_tracer); + if (ret) + return ret; + + return 0; +} +device_initcall(init_wakeup_tracer); Index: linux-2.6.26/kernel/trace/trace_selftest.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/trace_selftest.c @@ -0,0 +1,540 @@ +/* Include in trace.c */ + +#include +#include + +static inline int trace_valid_entry(struct trace_entry *entry) +{ + switch (entry->type) { + case TRACE_FN: + case TRACE_CTX: + case TRACE_WAKE: + case TRACE_STACK: + case TRACE_SPECIAL: + return 1; + } + return 0; +} + +static int +trace_test_buffer_cpu(struct trace_array *tr, struct trace_array_cpu *data) +{ + struct trace_entry *entries; + struct page *page; + int idx = 0; + int i; + + BUG_ON(list_empty(&data->trace_pages)); + page = list_entry(data->trace_pages.next, struct page, lru); + entries = page_address(page); + + check_pages(data); + if (head_page(data) != entries) + goto failed; + + /* + * The starting trace buffer always has valid elements, + * if any element exists. + */ + entries = head_page(data); + + for (i = 0; i < tr->entries; i++) { + + if (i < data->trace_idx && !trace_valid_entry(&entries[idx])) { + printk(KERN_CONT ".. invalid entry %d ", + entries[idx].type); + goto failed; + } + + idx++; + if (idx >= ENTRIES_PER_PAGE) { + page = virt_to_page(entries); + if (page->lru.next == &data->trace_pages) { + if (i != tr->entries - 1) { + printk(KERN_CONT ".. entries buffer mismatch"); + goto failed; + } + } else { + page = list_entry(page->lru.next, struct page, lru); + entries = page_address(page); + } + idx = 0; + } + } + + page = virt_to_page(entries); + if (page->lru.next != &data->trace_pages) { + printk(KERN_CONT ".. too many entries"); + goto failed; + } + + return 0; + + failed: + /* disable tracing */ + tracing_disabled = 1; + printk(KERN_CONT ".. corrupted trace buffer .. "); + return -1; +} + +/* + * Test the trace buffer to see if all the elements + * are still sane. + */ +static int trace_test_buffer(struct trace_array *tr, unsigned long *count) +{ + unsigned long flags, cnt = 0; + int cpu, ret = 0; + + /* Don't allow flipping of max traces now */ + raw_local_irq_save(flags); + __raw_spin_lock(&ftrace_max_lock); + for_each_possible_cpu(cpu) { + if (!head_page(tr->data[cpu])) + continue; + + cnt += tr->data[cpu]->trace_idx; + + ret = trace_test_buffer_cpu(tr, tr->data[cpu]); + if (ret) + break; + } + __raw_spin_unlock(&ftrace_max_lock); + raw_local_irq_restore(flags); + + if (count) + *count = cnt; + + return ret; +} + +#ifdef CONFIG_FTRACE + +#ifdef CONFIG_DYNAMIC_FTRACE + +#define __STR(x) #x +#define STR(x) __STR(x) + +/* Test dynamic code modification and ftrace filters */ +int trace_selftest_startup_dynamic_tracing(struct tracer *trace, + struct trace_array *tr, + int (*func)(void)) +{ + unsigned long count; + int ret; + int save_ftrace_enabled = ftrace_enabled; + int save_tracer_enabled = tracer_enabled; + char *func_name; + + /* The ftrace test PASSED */ + printk(KERN_CONT "PASSED\n"); + pr_info("Testing dynamic ftrace: "); + + /* enable tracing, and record the filter function */ + ftrace_enabled = 1; + tracer_enabled = 1; + + /* passed in by parameter to fool gcc from optimizing */ + func(); + + /* update the records */ + ret = ftrace_force_update(); + if (ret) { + printk(KERN_CONT ".. ftraced failed .. "); + return ret; + } + + /* + * Some archs *cough*PowerPC*cough* add charachters to the + * start of the function names. We simply put a '*' to + * accomodate them. + */ + func_name = "*" STR(DYN_FTRACE_TEST_NAME); + + /* filter only on our function */ + ftrace_set_filter(func_name, strlen(func_name), 1); + + /* enable tracing */ + tr->ctrl = 1; + trace->init(tr); + /* Sleep for a 1/10 of a second */ + msleep(100); + + /* we should have nothing in the buffer */ + ret = trace_test_buffer(tr, &count); + if (ret) + goto out; + + if (count) { + ret = -1; + printk(KERN_CONT ".. filter did not filter .. "); + goto out; + } + + /* call our function again */ + func(); + + /* sleep again */ + msleep(100); + + /* stop the tracing. */ + tr->ctrl = 0; + trace->ctrl_update(tr); + ftrace_enabled = 0; + + /* check the trace buffer */ + ret = trace_test_buffer(tr, &count); + trace->reset(tr); + + /* we should only have one item */ + if (!ret && count != 1) { + printk(KERN_CONT ".. filter failed count=%ld ..", count); + ret = -1; + goto out; + } + out: + ftrace_enabled = save_ftrace_enabled; + tracer_enabled = save_tracer_enabled; + + /* Enable tracing on all functions again */ + ftrace_set_filter(NULL, 0, 1); + + return ret; +} +#else +# define trace_selftest_startup_dynamic_tracing(trace, tr, func) ({ 0; }) +#endif /* CONFIG_DYNAMIC_FTRACE */ +/* + * Simple verification test of ftrace function tracer. + * Enable ftrace, sleep 1/10 second, and then read the trace + * buffer to see if all is in order. + */ +int +trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr) +{ + unsigned long count; + int ret; + int save_ftrace_enabled = ftrace_enabled; + int save_tracer_enabled = tracer_enabled; + + /* make sure msleep has been recorded */ + msleep(1); + + /* force the recorded functions to be traced */ + ret = ftrace_force_update(); + if (ret) { + printk(KERN_CONT ".. ftraced failed .. "); + return ret; + } + + /* start the tracing */ + ftrace_enabled = 1; + tracer_enabled = 1; + + tr->ctrl = 1; + trace->init(tr); + /* Sleep for a 1/10 of a second */ + msleep(100); + /* stop the tracing. */ + tr->ctrl = 0; + trace->ctrl_update(tr); + ftrace_enabled = 0; + + /* check the trace buffer */ + ret = trace_test_buffer(tr, &count); + trace->reset(tr); + + if (!ret && !count) { + printk(KERN_CONT ".. no entries found .."); + ret = -1; + goto out; + } + + ret = trace_selftest_startup_dynamic_tracing(trace, tr, + DYN_FTRACE_TEST_NAME); + + out: + ftrace_enabled = save_ftrace_enabled; + tracer_enabled = save_tracer_enabled; + + /* kill ftrace totally if we failed */ + if (ret) + ftrace_kill(); + + return ret; +} +#endif /* CONFIG_FTRACE */ + +#ifdef CONFIG_IRQSOFF_TRACER +int +trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr) +{ + unsigned long save_max = tracing_max_latency; + unsigned long count; + int ret; + + /* start the tracing */ + tr->ctrl = 1; + trace->init(tr); + /* reset the max latency */ + tracing_max_latency = 0; + /* disable interrupts for a bit */ + local_irq_disable(); + udelay(100); + local_irq_enable(); + /* stop the tracing. */ + tr->ctrl = 0; + trace->ctrl_update(tr); + /* check both trace buffers */ + ret = trace_test_buffer(tr, NULL); + if (!ret) + ret = trace_test_buffer(&max_tr, &count); + trace->reset(tr); + + if (!ret && !count) { + printk(KERN_CONT ".. no entries found .."); + ret = -1; + } + + tracing_max_latency = save_max; + + return ret; +} +#endif /* CONFIG_IRQSOFF_TRACER */ + +#ifdef CONFIG_PREEMPT_TRACER +int +trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr) +{ + unsigned long save_max = tracing_max_latency; + unsigned long count; + int ret; + + /* start the tracing */ + tr->ctrl = 1; + trace->init(tr); + /* reset the max latency */ + tracing_max_latency = 0; + /* disable preemption for a bit */ + preempt_disable(); + udelay(100); + preempt_enable(); + /* stop the tracing. */ + tr->ctrl = 0; + trace->ctrl_update(tr); + /* check both trace buffers */ + ret = trace_test_buffer(tr, NULL); + if (!ret) + ret = trace_test_buffer(&max_tr, &count); + trace->reset(tr); + + if (!ret && !count) { + printk(KERN_CONT ".. no entries found .."); + ret = -1; + } + + tracing_max_latency = save_max; + + return ret; +} +#endif /* CONFIG_PREEMPT_TRACER */ + +#if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER) +int +trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *tr) +{ + unsigned long save_max = tracing_max_latency; + unsigned long count; + int ret; + + /* start the tracing */ + tr->ctrl = 1; + trace->init(tr); + + /* reset the max latency */ + tracing_max_latency = 0; + + /* disable preemption and interrupts for a bit */ + preempt_disable(); + local_irq_disable(); + udelay(100); + preempt_enable(); + /* reverse the order of preempt vs irqs */ + local_irq_enable(); + + /* stop the tracing. */ + tr->ctrl = 0; + trace->ctrl_update(tr); + /* check both trace buffers */ + ret = trace_test_buffer(tr, NULL); + if (ret) + goto out; + + ret = trace_test_buffer(&max_tr, &count); + if (ret) + goto out; + + if (!ret && !count) { + printk(KERN_CONT ".. no entries found .."); + ret = -1; + goto out; + } + + /* do the test by disabling interrupts first this time */ + tracing_max_latency = 0; + tr->ctrl = 1; + trace->ctrl_update(tr); + preempt_disable(); + local_irq_disable(); + udelay(100); + preempt_enable(); + /* reverse the order of preempt vs irqs */ + local_irq_enable(); + + /* stop the tracing. */ + tr->ctrl = 0; + trace->ctrl_update(tr); + /* check both trace buffers */ + ret = trace_test_buffer(tr, NULL); + if (ret) + goto out; + + ret = trace_test_buffer(&max_tr, &count); + + if (!ret && !count) { + printk(KERN_CONT ".. no entries found .."); + ret = -1; + goto out; + } + + out: + trace->reset(tr); + tracing_max_latency = save_max; + + return ret; +} +#endif /* CONFIG_IRQSOFF_TRACER && CONFIG_PREEMPT_TRACER */ + +#ifdef CONFIG_SCHED_TRACER +static int trace_wakeup_test_thread(void *data) +{ + /* Make this a RT thread, doesn't need to be too high */ + struct sched_param param = { .sched_priority = 5 }; + struct completion *x = data; + + sched_setscheduler(current, SCHED_FIFO, ¶m); + + /* Make it know we have a new prio */ + complete(x); + + /* now go to sleep and let the test wake us up */ + set_current_state(TASK_INTERRUPTIBLE); + schedule(); + + /* we are awake, now wait to disappear */ + while (!kthread_should_stop()) { + /* + * This is an RT task, do short sleeps to let + * others run. + */ + msleep(100); + } + + return 0; +} + +int +trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr) +{ + unsigned long save_max = tracing_max_latency; + struct task_struct *p; + struct completion isrt; + unsigned long count; + int ret; + + init_completion(&isrt); + + /* create a high prio thread */ + p = kthread_run(trace_wakeup_test_thread, &isrt, "ftrace-test"); + if (IS_ERR(p)) { + printk(KERN_CONT "Failed to create ftrace wakeup test thread "); + return -1; + } + + /* make sure the thread is running at an RT prio */ + wait_for_completion(&isrt); + + /* start the tracing */ + tr->ctrl = 1; + trace->init(tr); + /* reset the max latency */ + tracing_max_latency = 0; + + /* sleep to let the RT thread sleep too */ + msleep(100); + + /* + * Yes this is slightly racy. It is possible that for some + * strange reason that the RT thread we created, did not + * call schedule for 100ms after doing the completion, + * and we do a wakeup on a task that already is awake. + * But that is extremely unlikely, and the worst thing that + * happens in such a case, is that we disable tracing. + * Honestly, if this race does happen something is horrible + * wrong with the system. + */ + + wake_up_process(p); + + /* stop the tracing. */ + tr->ctrl = 0; + trace->ctrl_update(tr); + /* check both trace buffers */ + ret = trace_test_buffer(tr, NULL); + if (!ret) + ret = trace_test_buffer(&max_tr, &count); + + + trace->reset(tr); + + tracing_max_latency = save_max; + + /* kill the thread */ + kthread_stop(p); + + if (!ret && !count) { + printk(KERN_CONT ".. no entries found .."); + ret = -1; + } + + return ret; +} +#endif /* CONFIG_SCHED_TRACER */ + +#ifdef CONFIG_CONTEXT_SWITCH_TRACER +int +trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr) +{ + unsigned long count; + int ret; + + /* start the tracing */ + tr->ctrl = 1; + trace->init(tr); + /* Sleep for a 1/10 of a second */ + msleep(100); + /* stop the tracing. */ + tr->ctrl = 0; + trace->ctrl_update(tr); + /* check the trace buffer */ + ret = trace_test_buffer(tr, &count); + trace->reset(tr); + + if (!ret && !count) { + printk(KERN_CONT ".. no entries found .."); + ret = -1; + } + + return ret; +} +#endif /* CONFIG_CONTEXT_SWITCH_TRACER */ Index: linux-2.6.26/kernel/trace/trace_selftest_dynamic.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/trace_selftest_dynamic.c @@ -0,0 +1,7 @@ +#include "trace.h" + +int DYN_FTRACE_TEST_NAME(void) +{ + /* used to call mcount */ + return 0; +} Index: linux-2.6.26/lib/Kconfig.debug =================================================================== --- linux-2.6.26.orig/lib/Kconfig.debug +++ linux-2.6.26/lib/Kconfig.debug @@ -634,6 +634,8 @@ config LATENCYTOP Enable this option if you want to use the LatencyTOP tool to find out which userspace is blocking on what kernel operations. +source kernel/trace/Kconfig + config PROVIDE_OHCI1394_DMA_INIT bool "Remote debugging over FireWire early on boot" depends on PCI && X86 Index: linux-2.6.26/lib/Makefile =================================================================== --- linux-2.6.26.orig/lib/Makefile +++ linux-2.6.26/lib/Makefile @@ -8,6 +8,15 @@ lib-y := ctype.o string.o vsprintf.o cmd sha1.o irq_regs.o reciprocal_div.o argv_split.o \ proportions.o prio_heap.o ratelimit.o +ifdef CONFIG_FTRACE +# Do not profile string.o, since it may be used in early boot or vdso +CFLAGS_REMOVE_string.o = -pg +# Also do not profile any debug utilities +CFLAGS_REMOVE_spinlock_debug.o = -pg +CFLAGS_REMOVE_list_debug.o = -pg +CFLAGS_REMOVE_debugobjects.o = -pg +endif + lib-$(CONFIG_MMU) += ioremap.o lib-$(CONFIG_SMP) += cpumask.o Index: linux-2.6.26/mm/page-writeback.c =================================================================== --- linux-2.6.26.orig/mm/page-writeback.c +++ linux-2.6.26/mm/page-writeback.c @@ -126,8 +126,6 @@ static void background_writeout(unsigned static struct prop_descriptor vm_completions; static struct prop_descriptor vm_dirties; -static unsigned long determine_dirtyable_memory(void); - /* * couple the period to the dirty_ratio: * @@ -347,7 +345,13 @@ static unsigned long highmem_dirtyable_m #endif } -static unsigned long determine_dirtyable_memory(void) +/** + * determine_dirtyable_memory - amount of memory that may be used + * + * Returns the numebr of pages that can currently be freed and used + * by the kernel for direct mappings. + */ +unsigned long determine_dirtyable_memory(void) { unsigned long x; Index: linux-2.6.26/scripts/Makefile.lib =================================================================== --- linux-2.6.26.orig/scripts/Makefile.lib +++ linux-2.6.26/scripts/Makefile.lib @@ -96,7 +96,8 @@ basename_flags = -D"KBUILD_BASENAME=KBUI modname_flags = $(if $(filter 1,$(words $(modname))),\ -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))") -_c_flags = $(KBUILD_CFLAGS) $(ccflags-y) $(CFLAGS_$(basetarget).o) +orig_c_flags = $(KBUILD_CFLAGS) $(ccflags-y) $(CFLAGS_$(basetarget).o) +_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags)) _a_flags = $(KBUILD_AFLAGS) $(asflags-y) $(AFLAGS_$(basetarget).o) _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) patches/frace-use-tsc.patch0000664000076400007640000000073211043564061014721 0ustar tglxtglxUse tsc as ftrace clock till we get all the sched_clock fixes in. --- kernel/trace/trace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/kernel/trace/trace.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace.c +++ linux-2.6.26/kernel/trace/trace.c @@ -60,7 +60,7 @@ ns2usecs(cycle_t nsec) cycle_t ftrace_now(int cpu) { - return cpu_clock(cpu); + return sched_clock(); } /* patches/ftrace-function-record-nop.patch0000664000076400007640000000243111043564061017413 0ustar tglxtglxFrom: Steven Rostedt Subject: ftrace: define function trace nop When CONFIG_FTRACE is not enabled, the tracing_start_functon_trace and tracing_stop_function_Trace should be nops. Signed-off-by: Steven Rostedt --- kernel/trace/trace.h | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) Index: linux-2.6.26/kernel/trace/trace.h =================================================================== --- linux-2.6.26.orig/kernel/trace/trace.h +++ linux-2.6.26/kernel/trace/trace.h @@ -216,8 +216,6 @@ void trace_function(struct trace_array * unsigned long parent_ip, unsigned long flags); -void tracing_start_function_trace(void); -void tracing_stop_function_trace(void); void tracing_start_cmdline_record(void); void tracing_stop_cmdline_record(void); int register_tracer(struct tracer *type); @@ -234,6 +232,14 @@ void update_max_tr_single(struct trace_a extern cycle_t ftrace_now(int cpu); +#ifdef CONFIG_FTRACE +void tracing_start_function_trace(void); +void tracing_stop_function_trace(void); +#else +# define tracing_start_function_trace() do { } while (0) +# define tracing_stop_function_trace() do { } while (0) +#endif + #ifdef CONFIG_CONTEXT_SWITCH_TRACER typedef void (*tracer_switch_func_t)(void *private, patches/ftrace-use-preempt-disable-not-irq-disable.patch0000664000076400007640000000360311043564061022361 0ustar tglxtglxFrom: Steven Rostedt Subject: ftrace: avoid lockdep recursion The function_trace_call needs to find the cpu it is running on to be able to disable the trace to pretect from recursion. It currently performs a local_irq_save, but when lockdep is on, this may cause unwanted recursion if lockdep happens to call something that is traced. This patch changes this to use preempt_disable instead. Signed-off-by: Steven Rostedt --- kernel/trace/trace.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) Index: linux-2.6.26/kernel/trace/trace.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace.c +++ linux-2.6.26/kernel/trace/trace.c @@ -983,7 +983,7 @@ function_trace_call(unsigned long ip, un struct trace_array_cpu *data; unsigned long flags; long disabled; - int cpu; + int cpu, resched; if (unlikely(!tracer_enabled)) return; @@ -991,16 +991,30 @@ function_trace_call(unsigned long ip, un if (skip_trace(ip)) return; - local_irq_save(flags); + resched = need_resched(); + preempt_disable_notrace(); cpu = raw_smp_processor_id(); data = tr->data[cpu]; disabled = atomic_inc_return(&data->disabled); - if (likely(disabled == 1)) + if (likely(disabled == 1)) { + local_save_flags(flags); trace_function(tr, data, ip, parent_ip, flags); + } atomic_dec(&data->disabled); - local_irq_restore(flags); + + /* + * To prevent recursion with schedule(), we look at the + * resched flag before disabling preemption. If it is already + * set, then we may be just calling schedule, and we don't + * want to call schedule again. But if it was not set, then + * it is fine to call schedule() if we need to. + */ + if (resched) + preempt_enable_no_resched_notrace(); + else + preempt_enable_notrace(); } static struct ftrace_ops trace_ops __read_mostly = patches/cycles-to-ns-trace-fix.patch0000664000076400007640000000454511043564060016465 0ustar tglxtglx--- arch/x86/kernel/tsc_32.c | 9 ++++++++- arch/x86/kernel/tsc_64.c | 5 ++++- include/asm-x86/timer.h | 3 --- 3 files changed, 12 insertions(+), 5 deletions(-) Index: linux-2.6.26/arch/x86/kernel/tsc_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/tsc_32.c +++ linux-2.6.26/arch/x86/kernel/tsc_32.c @@ -114,6 +114,7 @@ static void set_cyc2ns_scale(unsigned lo unsigned long long notrace native_sched_clock(void) { unsigned long long this_offset; + unsigned long long ret; /* * Fall back to jiffies if there's no TSC available: @@ -127,11 +128,17 @@ unsigned long long notrace native_sched /* No locking but a rare wrong value is not a big deal: */ return (jiffies_64 - INITIAL_JIFFIES) * (1000000000 / HZ); + preempt_disable_notrace(); + /* read the Time Stamp Counter: */ rdtscll(this_offset); /* return the value in ns */ - return cycles_2_ns(this_offset); + ret = cycles_2_ns(this_offset); + + preempt_enable_notrace(); + + return ret; } /* We need to define a real function for sched_clock, to override the Index: linux-2.6.26/arch/x86/kernel/tsc_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/tsc_64.c +++ linux-2.6.26/arch/x86/kernel/tsc_64.c @@ -66,6 +66,7 @@ static void set_cyc2ns_scale(unsigned lo unsigned long long native_sched_clock(void) { unsigned long a = 0; + unsigned long long ret; /* Could do CPU core sync here. Opteron can execute rdtsc speculatively, * which means it is not completely exact and may not be monotonous @@ -73,8 +74,10 @@ unsigned long long native_sched_clock(vo * scheduling purposes. */ + preempt_disable_notrace(); rdtscll(a); - return cycles_2_ns(a); + ret = cycles_2_ns(a); + preempt_enable_notrace(); } /* We need to define a real function for sched_clock, to override the Index: linux-2.6.26/include/asm-x86/timer.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/timer.h +++ linux-2.6.26/include/asm-x86/timer.h @@ -51,11 +51,8 @@ static inline notrace unsigned long long static inline notrace unsigned long long cycles_2_ns(unsigned long long cyc) { unsigned long long ns; - unsigned long flags; - local_irq_save(flags); ns = __cycles_2_ns(cyc); - local_irq_restore(flags); return ns; } patches/native-sched-clock-booboo.patch0000664000076400007640000000160611043564060017200 0ustar tglxtglxFrom efault@gmx.de Tue May 20 00:39:33 2008 Date: Tue, 20 May 2008 06:27:45 +0200 From: Mike Galbraith To: Steven Rostedt Subject: Re: 2.6.25.4-rt2 (native_sched_clock() booboo) On Mon, 2008-05-19 at 18:43 -0400, Steven Rostedt wrote: > We are pleased to announce the 2.6.25.4-rt2 tree, which can be > downloaded from the location: I noticed a booboo watching the build. --- arch/x86/kernel/tsc_64.c | 1 + 1 file changed, 1 insertion(+) Index: linux-2.6.26/arch/x86/kernel/tsc_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/tsc_64.c +++ linux-2.6.26/arch/x86/kernel/tsc_64.c @@ -78,6 +78,7 @@ unsigned long long native_sched_clock(vo rdtscll(a); ret = cycles_2_ns(a); preempt_enable_notrace(); + return ret; } /* We need to define a real function for sched_clock, to override the patches/tracer-add-event-markers.patch0000664000076400007640000002017311043564060017047 0ustar tglxtglxAdd markers to various events This patch adds markers to various events in the kernel. (interrupts, task activation and hrtimers) Signed-off-by: Steven Rostedt --- arch/x86/kernel/apic_32.c | 2 + arch/x86/kernel/irq_32.c | 3 ++ arch/x86/kernel/irq_64.c | 3 ++ arch/x86/kernel/traps_32.c | 3 ++ arch/x86/kernel/traps_64.c | 3 ++ arch/x86/mm/fault.c | 3 ++ include/linux/ftrace.h | 49 +++++++++++++++++++++++++++++++++++++++++++++ kernel/hrtimer.c | 6 +++++ kernel/sched.c | 7 ++++++ 9 files changed, 79 insertions(+) Index: linux-2.6.26/arch/x86/kernel/apic_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/apic_32.c +++ linux-2.6.26/arch/x86/kernel/apic_32.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include @@ -604,6 +605,7 @@ void smp_apic_timer_interrupt(struct pt_ { struct pt_regs *old_regs = set_irq_regs(regs); + ftrace_event_irq(-1, user_mode(regs), regs->eip); /* * NOTE! We'd better ACK the irq immediately, * because timer handling can be slow. Index: linux-2.6.26/arch/x86/kernel/irq_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/irq_32.c +++ linux-2.6.26/arch/x86/kernel/irq_32.c @@ -16,6 +16,8 @@ #include #include +#include + #include #include @@ -85,6 +87,7 @@ unsigned int do_IRQ(struct pt_regs *regs old_regs = set_irq_regs(regs); irq_enter(); + ftrace_event_irq(irq, user_mode(regs), regs->eip); #ifdef CONFIG_DEBUG_STACKOVERFLOW /* Debugging check for stack overflow: is there less than 1KB free? */ { Index: linux-2.6.26/arch/x86/kernel/irq_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/irq_64.c +++ linux-2.6.26/arch/x86/kernel/irq_64.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -169,6 +170,8 @@ asmlinkage unsigned int do_IRQ(struct pt irq_enter(); irq = __get_cpu_var(vector_irq)[vector]; + ftrace_event_irq(irq, user_mode(regs), regs->ip); + #ifdef CONFIG_DEBUG_STACKOVERFLOW stack_overflow_check(regs); #endif Index: linux-2.6.26/arch/x86/kernel/traps_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/traps_32.c +++ linux-2.6.26/arch/x86/kernel/traps_32.c @@ -31,6 +31,7 @@ #include #include #include +#include #ifdef CONFIG_EISA #include @@ -835,6 +836,8 @@ notrace __kprobes void do_nmi(struct pt_ nmi_enter(); + ftrace_event_irq(-1, user_mode(regs), regs->eip); + cpu = smp_processor_id(); ++nmi_count(cpu); Index: linux-2.6.26/arch/x86/kernel/traps_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/traps_64.c +++ linux-2.6.26/arch/x86/kernel/traps_64.c @@ -32,6 +32,7 @@ #include #include #include +#include #include @@ -835,6 +836,8 @@ asmlinkage notrace __kprobes void defau cpu = smp_processor_id(); + ftrace_event_irq(-1, user_mode(regs), regs->ip); + /* Only the BSP gets external NMIs from the system. */ if (!cpu) reason = get_nmi_reason(); Index: linux-2.6.26/arch/x86/mm/fault.c =================================================================== --- linux-2.6.26.orig/arch/x86/mm/fault.c +++ linux-2.6.26/arch/x86/mm/fault.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include @@ -602,6 +603,8 @@ void __kprobes do_page_fault(struct pt_r /* get the address */ address = read_cr2(); + ftrace_event_fault(regs->ip, error_code, address); + si_code = SEGV_MAPERR; if (notify_page_fault(regs)) Index: linux-2.6.26/include/linux/ftrace.h =================================================================== --- linux-2.6.26.orig/include/linux/ftrace.h +++ linux-2.6.26/include/linux/ftrace.h @@ -4,6 +4,7 @@ #ifdef CONFIG_FTRACE #include +#include #include extern int ftrace_enabled; @@ -140,4 +141,52 @@ static inline void ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } #endif +#ifdef CONFIG_EVENT_TRACER +#include + +static inline void ftrace_event_irq(int irq, int user, unsigned long ip) +{ + trace_mark(ftrace_event_irq, "%d %d %ld", irq, user, ip); +} + +static inline void ftrace_event_fault(unsigned long ip, unsigned long error, + unsigned long addr) +{ + trace_mark(ftrace_event_fault, "%ld %ld %ld", ip, error, addr); +} + +static inline void ftrace_event_timer_set(void *p1, void *p2) +{ + trace_mark(ftrace_event_timer_set, "%p %p", p1, p2); +} + +static inline void ftrace_event_timer_triggered(void *p1, void *p2) +{ + trace_mark(ftrace_event_timer_triggered, "%p %p", p1, p2); +} + +static inline void ftrace_event_timestamp(ktime_t *time) +{ + trace_mark(ftrace_event_hrtimer, "%p", time); +} + +static inline void ftrace_event_task_activate(struct task_struct *p, int cpu) +{ + trace_mark(ftrace_event_task_activate, "%p %d", p, cpu); +} + +static inline void ftrace_event_task_deactivate(struct task_struct *p, int cpu) +{ + trace_mark(ftrace_event_task_deactivate, "%p %d", p, cpu); +} +#else +# define ftrace_event_irq(irq, user, ip) do { } while (0) +# define ftrace_event_fault(ip, error, addr) do { } while (0) +# define ftrace_event_timer_set(p1, p2) do { } while (0) +# define ftrace_event_timer_triggered(p1, p2) do { } while (0) +# define ftrace_event_timestamp(now) do { } while (0) +# define ftrace_event_task_activate(p, cpu) do { } while (0) +# define ftrace_event_task_deactivate(p, cpu) do { } while (0) +#endif /* CONFIG_TRACE_EVENTS */ + #endif /* _LINUX_FTRACE_H */ Index: linux-2.6.26/kernel/hrtimer.c =================================================================== --- linux-2.6.26.orig/kernel/hrtimer.c +++ linux-2.6.26/kernel/hrtimer.c @@ -44,6 +44,7 @@ #include #include #include +#include #include @@ -840,6 +841,8 @@ static void enqueue_hrtimer(struct hrtim debug_hrtimer_activate(timer); + ftrace_event_timer_set(&timer->expires, timer); + /* * Find the right place in the rbtree: */ @@ -1293,6 +1296,7 @@ void hrtimer_interrupt(struct clock_even retry: now = ktime_get(); + ftrace_event_timestamp(&now); expires_next.tv64 = KTIME_MAX; @@ -1321,6 +1325,8 @@ void hrtimer_interrupt(struct clock_even break; } + ftrace_event_timer_triggered(&timer->expires, timer); + /* Move softirq callbacks to the pending list */ if (timer->cb_mode == HRTIMER_CB_SOFTIRQ) { __remove_hrtimer(timer, base, Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -86,6 +86,11 @@ #define PRIO_TO_NICE(prio) ((prio) - MAX_RT_PRIO - 20) #define TASK_NICE(p) PRIO_TO_NICE((p)->static_prio) +#define __PRIO(prio) \ + ((prio) <= 99 ? 199 - (prio) : (prio) - 120) + +#define PRIO(p) __PRIO((p)->prio) + /* * 'User priority' is the nice value converted to something we * can work with better when scaling various scheduler parameters, @@ -1635,6 +1640,7 @@ static void activate_task(struct rq *rq, if (task_contributes_to_load(p)) rq->nr_uninterruptible--; + ftrace_event_task_activate(p, cpu_of(rq)); enqueue_task(rq, p, wakeup); inc_nr_running(p, rq); } @@ -1647,6 +1653,7 @@ static void deactivate_task(struct rq *r if (task_contributes_to_load(p)) rq->nr_uninterruptible++; + ftrace_event_task_deactivate(p, cpu_of(rq)); dequeue_task(rq, p, sleep); dec_nr_running(p, rq); } patches/tracer-event-trace.patch0000664000076400007640000006307611043564060015764 0ustar tglxtglxAdd event tracer. This patch adds a event trace that hooks into various events in the kernel. Although it can be used separately, it is mainly to help other traces (wakeup and preempt off) with seeing various events in the traces without having to enable the heavy mcount hooks. Signed-off-by: Steven Rostedt --- kernel/trace/Kconfig | 8 kernel/trace/Makefile | 1 kernel/trace/trace.c | 220 ++++++++++++++++ kernel/trace/trace.h | 98 +++++++ kernel/trace/trace_events.c | 566 ++++++++++++++++++++++++++++++++++++++++++ kernel/trace/trace_selftest.c | 7 6 files changed, 900 insertions(+) Index: linux-2.6.26/kernel/trace/Kconfig =================================================================== --- linux-2.6.26.orig/kernel/trace/Kconfig +++ linux-2.6.26/kernel/trace/Kconfig @@ -85,6 +85,14 @@ config SCHED_TRACER This tracer tracks the latency of the highest priority task to be scheduled in, starting from the point it has woken up. +config EVENT_TRACER + bool "trace kernel events" + select CONTEXT_SWITCH_TRACER + help + This option activates the event tracer of the latency_tracer. + It activates markers through out the kernel for tracing. + This option has a fairly low overhead when enabled. + config CONTEXT_SWITCH_TRACER bool "Trace process context switches" depends on HAVE_FTRACE Index: linux-2.6.26/kernel/trace/Makefile =================================================================== --- linux-2.6.26.orig/kernel/trace/Makefile +++ linux-2.6.26/kernel/trace/Makefile @@ -18,5 +18,6 @@ obj-$(CONFIG_FTRACE) += trace_functions. obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o +obj-$(CONFIG_EVENT_TRACER) += trace_events.o libftrace-y := ftrace.o Index: linux-2.6.26/kernel/trace/trace.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace.c +++ linux-2.6.26/kernel/trace/trace.c @@ -975,6 +975,126 @@ ftrace_special(unsigned long arg1, unsig local_irq_restore(flags); } +void tracing_event_irq(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + int irq, int usermode, + unsigned long retip) +{ + struct trace_entry *entry; + + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_IRQ; + entry->irq.ip = ip; + entry->irq.irq = irq; + entry->irq.ret_ip = retip; + entry->irq.usermode = usermode; +} + +void tracing_event_fault(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + unsigned long retip, + unsigned long error_code, + unsigned long address) +{ + struct trace_entry *entry; + + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_FAULT; + entry->fault.ip = ip; + entry->fault.ret_ip = retip; + entry->fault.errorcode = error_code; + entry->fault.address = address; +} + +void tracing_event_timer_set(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + ktime_t *expires, void *timer) +{ + struct trace_entry *entry; + + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_TIMER_SET; + entry->timer.ip = ip; + entry->timer.expire = *expires; + entry->timer.timer = timer; +} + +void tracing_event_timer_triggered(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + ktime_t *expired, void *timer) +{ + struct trace_entry *entry; + + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_TIMER_TRIG; + entry->timer.ip = ip; + entry->timer.expire = *expired; + entry->timer.timer = timer; +} + +void tracing_event_timestamp(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + ktime_t *now) +{ + struct trace_entry *entry; + + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_TIMESTAMP; + entry->timestamp.ip = ip; + entry->timestamp.now = *now; +} + +void tracing_event_task_activate(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + struct task_struct *p, + int task_cpu) +{ + struct trace_entry *entry; + + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_TASK_ACT; + entry->task.ip = ip; + entry->task.pid = p->pid; + entry->task.prio = p->prio; + entry->task.cpu = task_cpu; +} + +void tracing_event_task_deactivate(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + struct task_struct *p, + int task_cpu) +{ + struct trace_entry *entry; + + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_TASK_DEACT; + entry->task.ip = ip; + entry->task.pid = p->pid; + entry->task.prio = p->prio; + entry->task.cpu = task_cpu; +} + #ifdef CONFIG_FTRACE static void function_trace_call(unsigned long ip, unsigned long parent_ip) @@ -1514,6 +1634,55 @@ print_lat_fmt(struct trace_iterator *ite } trace_seq_puts(s, "\n"); break; + case TRACE_IRQ: + seq_print_ip_sym(s, entry->irq.ip, sym_flags); + if (entry->irq.irq >= 0) + trace_seq_printf(s, " %d ", entry->irq.irq); + if (entry->irq.usermode) + trace_seq_puts(s, " (usermode)\n "); + else { + trace_seq_puts(s, " ("); + seq_print_ip_sym(s, entry->irq.ret_ip, sym_flags); + trace_seq_puts(s, ")\n"); + } + break; + case TRACE_FAULT: + seq_print_ip_sym(s, entry->fault.ip, sym_flags); + trace_seq_printf(s, " %lx ", entry->fault.errorcode); + trace_seq_puts(s, " ("); + seq_print_ip_sym(s, entry->fault.ret_ip, sym_flags); + trace_seq_puts(s, ")"); + trace_seq_printf(s, " [%lx]\n", entry->fault.address); + break; + case TRACE_TIMER_SET: + seq_print_ip_sym(s, entry->timer.ip, sym_flags); + trace_seq_printf(s, " (%Ld) (%p)\n", + entry->timer.expire, entry->timer.timer); + break; + case TRACE_TIMER_TRIG: + seq_print_ip_sym(s, entry->timer.ip, sym_flags); + trace_seq_printf(s, " (%Ld) (%p)\n", + entry->timer.expire, entry->timer.timer); + break; + case TRACE_TIMESTAMP: + seq_print_ip_sym(s, entry->timestamp.ip, sym_flags); + trace_seq_printf(s, " (%Ld)\n", + entry->timestamp.now.tv64); + break; + case TRACE_TASK_ACT: + seq_print_ip_sym(s, entry->task.ip, sym_flags); + comm = trace_find_cmdline(entry->task.pid); + trace_seq_printf(s, " %s %d %d [%d]\n", + comm, entry->task.pid, + entry->task.prio, entry->task.cpu); + break; + case TRACE_TASK_DEACT: + seq_print_ip_sym(s, entry->task.ip, sym_flags); + comm = trace_find_cmdline(entry->task.pid); + trace_seq_printf(s, " %s %d %d [%d]\n", + comm, entry->task.pid, + entry->task.prio, entry->task.cpu); + break; default: trace_seq_printf(s, "Unknown type %d\n", entry->type); } @@ -1614,6 +1783,57 @@ static int print_trace_fmt(struct trace_ if (!ret) return 0; break; + case TRACE_IRQ: + seq_print_ip_sym(s, entry->irq.ip, sym_flags); + if (entry->irq.irq >= 0) + trace_seq_printf(s, " %d ", entry->irq.irq); + if (entry->irq.usermode) + trace_seq_puts(s, " (usermode)\n "); + else { + trace_seq_puts(s, " ("); + seq_print_ip_sym(s, entry->irq.ret_ip, sym_flags); + trace_seq_puts(s, ")\n"); + } + break; + case TRACE_FAULT: + seq_print_ip_sym(s, entry->fault.ip, sym_flags); + trace_seq_printf(s, " %lx ", entry->fault.errorcode); + trace_seq_puts(s, " ("); + seq_print_ip_sym(s, entry->fault.ret_ip, sym_flags); + trace_seq_puts(s, ")"); + trace_seq_printf(s, " [%lx]\n", entry->fault.address); + break; + case TRACE_TIMER_SET: + seq_print_ip_sym(s, entry->timer.ip, sym_flags); + trace_seq_printf(s, " (%Ld) (%p)\n", + entry->timer.expire, entry->timer.timer); + break; + case TRACE_TIMER_TRIG: + seq_print_ip_sym(s, entry->timer.ip, sym_flags); + trace_seq_printf(s, " (%Ld) (%p)\n", + entry->timer.expire, entry->timer.timer); + break; + case TRACE_TIMESTAMP: + seq_print_ip_sym(s, entry->timestamp.ip, sym_flags); + trace_seq_printf(s, " (%Ld)\n", + entry->timestamp.now.tv64); + break; + case TRACE_TASK_ACT: + seq_print_ip_sym(s, entry->task.ip, sym_flags); + comm = trace_find_cmdline(entry->task.pid); + trace_seq_printf(s, " %s %d %d [%d]\n", + comm, entry->task.pid, + entry->task.prio, entry->task.cpu); + break; + case TRACE_TASK_DEACT: + seq_print_ip_sym(s, entry->task.ip, sym_flags); + comm = trace_find_cmdline(entry->task.pid); + trace_seq_printf(s, " %s %d %d [%d]\n", + comm, entry->task.pid, + entry->task.prio, entry->task.cpu); + break; + default: + trace_seq_printf(s, "Unknown type %d\n", entry->type); } return 1; } Index: linux-2.6.26/kernel/trace/trace.h =================================================================== --- linux-2.6.26.orig/kernel/trace/trace.h +++ linux-2.6.26/kernel/trace/trace.h @@ -14,6 +14,13 @@ enum trace_type { TRACE_WAKE, TRACE_STACK, TRACE_SPECIAL, + TRACE_IRQ, + TRACE_FAULT, + TRACE_TIMER_SET, + TRACE_TIMER_TRIG, + TRACE_TIMESTAMP, + TRACE_TASK_ACT, + TRACE_TASK_DEACT, __TRACE_LAST_TYPE }; @@ -47,6 +54,45 @@ struct special_entry { unsigned long arg3; }; +struct irq_entry { + unsigned long ip; + unsigned long ret_ip; + unsigned irq; + unsigned usermode; +}; + +struct fault_entry { + unsigned long ip; + unsigned long ret_ip; + unsigned long errorcode; + unsigned long address; +}; + +struct timer_entry { + unsigned long ip; + ktime_t expire; + void *timer; +}; + +struct timestamp_entry { + unsigned long ip; + ktime_t now; +}; + +struct task_entry { + unsigned long ip; + pid_t pid; + unsigned prio; + int cpu; +}; + +struct wakeup_entry { + unsigned long ip; + pid_t pid; + unsigned prio; + unsigned curr_prio; +}; + /* * Stack-trace entry: */ @@ -75,6 +121,12 @@ struct trace_entry { struct ctx_switch_entry ctx; struct special_entry special; struct stack_entry stack; + struct irq_entry irq; + struct fault_entry fault; + struct timer_entry timer; + struct timestamp_entry timestamp; + struct task_entry task; + struct wakeup_entry wakeup; }; }; @@ -215,6 +267,52 @@ void trace_function(struct trace_array * unsigned long ip, unsigned long parent_ip, unsigned long flags); +void tracing_event_irq(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + int irq, int usermode, + unsigned long retip); +void tracing_event_fault(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + unsigned long retip, + unsigned long error_code, + unsigned long address); +void tracing_event_timer_set(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + ktime_t *expires, void *timer); +void tracing_event_timer_triggered(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + ktime_t *expired, void *timer); +void tracing_event_timestamp(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + ktime_t *now); +void tracing_event_task_activate(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + struct task_struct *p, + int cpu); +void tracing_event_task_deactivate(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + struct task_struct *p, + int cpu); +void tracing_event_wakeup(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + pid_t pid, int prio, + int curr_prio); void tracing_start_cmdline_record(void); void tracing_stop_cmdline_record(void); Index: linux-2.6.26/kernel/trace/trace_events.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/trace_events.c @@ -0,0 +1,566 @@ +/* + * trace task events + * + * Copyright (C) 2007 Steven Rostedt + * + * Based on code from the latency_tracer, that is: + * + * Copyright (C) 2004-2006 Ingo Molnar + * Copyright (C) 2004 William Lee Irwin III + */ +#include +#include +#include +#include +#include +#include + +#include "trace.h" + +static struct trace_array __read_mostly *events_trace; +static int __read_mostly tracer_enabled; +static atomic_t event_ref; + +static void event_reset(struct trace_array *tr) +{ + struct trace_array_cpu *data; + int cpu; + + for_each_possible_cpu(cpu) { + data = tr->data[cpu]; + tracing_reset(data); + } + + tr->time_start = ftrace_now(raw_smp_processor_id()); +} + +#define getarg(arg, ap) arg = va_arg(ap, typeof(arg)); + +static void +event_irq_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct trace_array *tr = probe_data; + struct trace_array_cpu *data; + unsigned long ip, flags; + int irq, user, cpu; + long disable; + + if (!tracer_enabled) + return; + + getarg(irq, *args); + getarg(user, *args); + getarg(ip, *args); + + /* interrupts should be off, we are in an interrupt */ + cpu = smp_processor_id(); + data = tr->data[cpu]; + + disable = atomic_inc_return(&data->disabled); + if (disable != 1) + goto out; + + local_save_flags(flags); + tracing_event_irq(tr, data, flags, CALLER_ADDR1, irq, user, ip); + + out: + atomic_dec(&data->disabled); +} + +static void +event_fault_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct trace_array *tr = probe_data; + struct trace_array_cpu *data; + unsigned long ip, flags, error, addr; + long disable; + int cpu; + + if (!tracer_enabled) + return; + + getarg(ip, *args); + getarg(error, *args); + getarg(addr, *args); + + preempt_disable_notrace(); + cpu = smp_processor_id(); + data = tr->data[cpu]; + + disable = atomic_inc_return(&data->disabled); + if (disable != 1) + goto out; + + local_save_flags(flags); + tracing_event_fault(tr, data, flags, CALLER_ADDR1, ip, error, addr); + + out: + atomic_dec(&data->disabled); + preempt_enable_notrace(); +} + +static void +event_timer_set_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct trace_array *tr = probe_data; + struct trace_array_cpu *data; + unsigned long flags; + ktime_t *expires; + void *timer; + long disable; + int cpu; + + if (!tracer_enabled) + return; + + getarg(expires, *args); + getarg(timer, *args); + + /* interrupts should be off, we are in an interrupt */ + cpu = smp_processor_id(); + data = tr->data[cpu]; + + disable = atomic_inc_return(&data->disabled); + if (disable != 1) + goto out; + + local_save_flags(flags); + tracing_event_timer_set(tr, data, flags, CALLER_ADDR1, expires, timer); + + out: + atomic_dec(&data->disabled); +} + +static void +event_timer_triggered_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct trace_array *tr = probe_data; + struct trace_array_cpu *data; + unsigned long flags; + ktime_t *expired; + void *timer; + long disable; + int cpu; + + if (!tracer_enabled) + return; + + getarg(expired, *args); + getarg(timer, *args); + + /* interrupts should be off, we are in an interrupt */ + cpu = smp_processor_id(); + data = tr->data[cpu]; + + disable = atomic_inc_return(&data->disabled); + if (disable != 1) + goto out; + + local_save_flags(flags); + tracing_event_timer_triggered(tr, data, flags, CALLER_ADDR1, expired, timer); + + out: + atomic_dec(&data->disabled); +} + +static void +event_hrtimer_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct trace_array *tr = probe_data; + struct trace_array_cpu *data; + unsigned long flags; + ktime_t *now; + long disable; + int cpu; + + if (!tracer_enabled) + return; + + getarg(now, *args); + + /* interrupts should be off, we are in an interrupt */ + cpu = smp_processor_id(); + data = tr->data[cpu]; + + disable = atomic_inc_return(&data->disabled); + if (disable != 1) + goto out; + + local_save_flags(flags); + tracing_event_timestamp(tr, data, flags, CALLER_ADDR1, now); + + out: + atomic_dec(&data->disabled); +} + +static void +event_task_activate_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct trace_array *tr = probe_data; + struct trace_array_cpu *data; + unsigned long flags; + struct task_struct *p; + long disable; + int cpu, rqcpu; + + if (!tracer_enabled) + return; + + getarg(p, *args); + getarg(rqcpu, *args); + + /* interrupts should be off, we are in an interrupt */ + cpu = smp_processor_id(); + data = tr->data[cpu]; + + disable = atomic_inc_return(&data->disabled); + if (disable != 1) + goto out; + + local_save_flags(flags); + tracing_event_task_activate(tr, data, flags, CALLER_ADDR1, p, rqcpu); + + out: + atomic_dec(&data->disabled); +} + +static void +event_task_deactivate_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct trace_array *tr = probe_data; + struct trace_array_cpu *data; + unsigned long flags; + struct task_struct *p; + long disable; + int cpu, rqcpu; + + if (!tracer_enabled) + return; + + getarg(p, *args); + getarg(rqcpu, *args); + + /* interrupts should be off, we are in an interrupt */ + cpu = smp_processor_id(); + data = tr->data[cpu]; + + disable = atomic_inc_return(&data->disabled); + if (disable != 1) + goto out; + + local_save_flags(flags); + tracing_event_task_deactivate(tr, data, flags, CALLER_ADDR1, p, rqcpu); + + out: + atomic_dec(&data->disabled); +} + +static void +event_wakeup_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct trace_array *tr = probe_data; + struct trace_array_cpu *data; + unsigned long flags; + struct task_struct *wakee, *curr; + long disable, ignore2; + void *ignore3; + int ignore1; + int cpu; + + if (!tracer_enabled) + return; + + getarg(ignore1, *args); + getarg(ignore2, *args); + getarg(ignore3, *args); + + getarg(wakee, *args); + getarg(curr, *args); + + /* interrupts should be disabled */ + cpu = smp_processor_id(); + data = tr->data[cpu]; + + disable = atomic_inc_return(&data->disabled); + if (unlikely(disable != 1)) + goto out; + + local_save_flags(flags); + /* record process's command line */ + tracing_record_cmdline(wakee); + tracing_record_cmdline(curr); + + tracing_sched_wakeup_trace(tr, data, wakee, curr, flags); + + out: + atomic_dec(&data->disabled); +} +static void +event_ctx_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct trace_array *tr = probe_data; + struct trace_array_cpu *data; + unsigned long flags; + struct task_struct *prev; + struct task_struct *next; + long disable, ignore2; + void *ignore3; + int ignore1; + int cpu; + + if (!tracer_enabled) + return; + + /* skip prev_pid %d next_pid %d prev_state %ld */ + getarg(ignore1, *args); + getarg(ignore1, *args); + getarg(ignore2, *args); + getarg(ignore3, *args); + + prev = va_arg(*args, typeof(prev)); + next = va_arg(*args, typeof(next)); + + tracing_record_cmdline(prev); + tracing_record_cmdline(next); + + /* interrupts should be disabled */ + cpu = smp_processor_id(); + data = tr->data[cpu]; + disable = atomic_inc_return(&data->disabled); + + if (likely(disable != 1)) + goto out; + + local_save_flags(flags); + tracing_sched_switch_trace(tr, data, prev, next, flags); + out: + atomic_dec(&data->disabled); +} + +static int event_register_marker(const char *name, const char *format, + marker_probe_func *probe, void *data) +{ + int ret; + + ret = marker_probe_register(name, format, probe, data); + if (ret) { + pr_info("event trace: Couldn't add marker" + " probe to %s\n", name); + return ret; + } + + return 0; +} + +static void event_tracer_register(struct trace_array *tr) +{ + int ret; + + ret = event_register_marker("ftrace_event_irq", "%d %d %ld", + event_irq_callback, tr); + if (ret) + return; + + ret = event_register_marker("ftrace_event_fault", "%ld %ld %ld", + event_fault_callback, tr); + if (ret) + goto out1; + + ret = event_register_marker("ftrace_event_timer_set", "%p %p", + event_timer_set_callback, tr); + if (ret) + goto out2; + + ret = event_register_marker("ftrace_event_timer_triggered", "%p %p", + event_timer_triggered_callback, tr); + if (ret) + goto out3; + + ret = event_register_marker("ftrace_event_hrtimer", "%p", + event_hrtimer_callback, tr); + if (ret) + goto out4; + + ret = event_register_marker("ftrace_event_task_activate", "%p %d", + event_task_activate_callback, tr); + if (ret) + goto out5; + + ret = event_register_marker("ftrace_event_task_deactivate", "%p %d", + event_task_deactivate_callback, tr); + if (ret) + goto out6; + + ret = event_register_marker("kernel_sched_wakeup", + "pid %d state %ld ## rq %p task %p rq->curr %p", + event_wakeup_callback, tr); + if (ret) + goto out7; + + ret = event_register_marker("kernel_sched_wakeup_new", + "pid %d state %ld ## rq %p task %p rq->curr %p", + event_wakeup_callback, tr); + if (ret) + goto out8; + + ret = event_register_marker("kernel_sched_schedule", + "prev_pid %d next_pid %d prev_state %ld " + "## rq %p prev %p next %p", + event_ctx_callback, tr); + if (ret) + goto out9; + + return; + + out9: + marker_probe_unregister("kernel_sched_wakeup_new", + event_wakeup_callback, tr); + out8: + marker_probe_unregister("kernel_sched_wakeup", + event_wakeup_callback, tr); + out7: + marker_probe_unregister("ftrace_event_task_deactivate", + event_task_deactivate_callback, tr); + out6: + marker_probe_unregister("ftrace_event_task_activate", + event_task_activate_callback, tr); + out5: + marker_probe_unregister("ftrace_event_hrtimer", + event_hrtimer_callback, tr); + out4: + marker_probe_unregister("ftrace_event_timer_triggered", + event_timer_triggered_callback, tr); + out3: + marker_probe_unregister("ftrace_event_timer_set", + event_timer_set_callback, tr); + out2: + marker_probe_unregister("ftrace_event_fault", + event_fault_callback, tr); + out1: + marker_probe_unregister("ftrace_event_irq", + event_irq_callback, tr); +} + +static void event_tracer_unregister(struct trace_array *tr) +{ + marker_probe_unregister("kernel_sched_schedule", + event_ctx_callback, tr); + marker_probe_unregister("kernel_sched_wakeup_new", + event_wakeup_callback, tr); + marker_probe_unregister("kernel_sched_wakeup", + event_wakeup_callback, tr); + marker_probe_unregister("ftrace_event_task_deactivate", + event_task_deactivate_callback, tr); + marker_probe_unregister("ftrace_event_task_activate", + event_task_activate_callback, tr); + marker_probe_unregister("ftrace_event_hrtimer", + event_hrtimer_callback, tr); + marker_probe_unregister("ftrace_event_timer_triggered", + event_timer_triggered_callback, tr); + marker_probe_unregister("ftrace_event_timer_set", + event_timer_set_callback, tr); + marker_probe_unregister("ftrace_event_fault", + event_fault_callback, tr); + marker_probe_unregister("ftrace_event_irq", + event_irq_callback, tr); +} + +void trace_event_register(struct trace_array *tr) +{ + long ref; + + ref = atomic_inc_return(&event_ref); + if (ref == 1) + event_tracer_register(tr); +} + +void trace_event_unregister(struct trace_array *tr) +{ + long ref; + + ref = atomic_dec_and_test(&event_ref); + if (ref) + event_tracer_unregister(tr); +} + +static void start_event_trace(struct trace_array *tr) +{ + event_reset(tr); + trace_event_register(tr); + tracing_start_function_trace(); + tracer_enabled = 1; +} + +static void stop_event_trace(struct trace_array *tr) +{ + tracer_enabled = 0; + tracing_stop_function_trace(); + trace_event_unregister(tr); +} + +static void event_trace_init(struct trace_array *tr) +{ + events_trace = tr; + + if (tr->ctrl) + start_event_trace(tr); +} + +static void event_trace_reset(struct trace_array *tr) +{ + if (tr->ctrl) + stop_event_trace(tr); +} + +static void event_trace_ctrl_update(struct trace_array *tr) +{ + if (tr->ctrl) + start_event_trace(tr); + else + stop_event_trace(tr); +} + +static void event_trace_open(struct trace_iterator *iter) +{ + /* stop the trace while dumping */ + if (iter->tr->ctrl) + tracer_enabled = 0; +} + +static void event_trace_close(struct trace_iterator *iter) +{ + if (iter->tr->ctrl) + tracer_enabled = 1; +} + +static struct tracer event_trace __read_mostly = +{ + .name = "events", + .init = event_trace_init, + .reset = event_trace_reset, + .open = event_trace_open, + .close = event_trace_close, + .ctrl_update = event_trace_ctrl_update, +}; + +__init static int init_event_trace(void) +{ + int ret; + + ret = register_tracer(&event_trace); + if (ret) + return ret; + + return 0; +} + +device_initcall(init_event_trace); Index: linux-2.6.26/kernel/trace/trace_selftest.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace_selftest.c +++ linux-2.6.26/kernel/trace/trace_selftest.c @@ -11,6 +11,13 @@ static inline int trace_valid_entry(stru case TRACE_WAKE: case TRACE_STACK: case TRACE_SPECIAL: + case TRACE_IRQ: + case TRACE_FAULT: + case TRACE_TIMER_SET: + case TRACE_TIMER_TRIG: + case TRACE_TIMESTAMP: + case TRACE_TASK_ACT: + case TRACE_TASK_DEACT: return 1; } return 0; patches/trace-histograms.patch0000664000076400007640000005650411043564060015543 0ustar tglxtglxCritical latency timings histogram This patch adds hooks into the latency tracer to give us histograms of interrupts off, preemption off and wakeup timings. This code was based off of work done by Yi Yang But heavily modified to work with the new tracer, and some clean ups by Steven Rostedt This adds the following to /debugfs/tracing latency_hist/ - root dir for historgrams. Under latency_hist there is (depending on what's configured): interrupt_off_latency/ - latency histograms of interrupts off. preempt_interrupts_off_latency/ - latency histograms of preemption and/or interrupts off. preempt_off_latency/ - latency histograms of preemption off. wakeup_latency/ - latency histograms of wakeup timings. Under each of the above is a file labeled: CPU# for each possible CPU were # is the CPU number. reset - writing into this file will reset the histogram back to zeros and start again. Signed-off-by: Steven Rostedt --- kernel/trace/Kconfig | 22 + kernel/trace/Makefile | 4 kernel/trace/trace_hist.c | 638 +++++++++++++++++++++++++++++++++++++++++++ kernel/trace/trace_hist.h | 39 ++ kernel/trace/trace_irqsoff.c | 19 + 5 files changed, 722 insertions(+) Index: linux-2.6.26/kernel/trace/Kconfig =================================================================== --- linux-2.6.26.orig/kernel/trace/Kconfig +++ linux-2.6.26/kernel/trace/Kconfig @@ -133,3 +133,25 @@ config FTRACE_STARTUP_TEST a series of tests are made to verify that the tracer is functioning properly. It will do tests on all the configured tracers of ftrace. + +config INTERRUPT_OFF_HIST + bool "Interrupts off critical timings histogram" + depends on IRQSOFF_TRACER + help + This option uses the infrastructure of the critical + irqs off timings to create a histogram of latencies. + +config PREEMPT_OFF_HIST + bool "Preempt off critical timings histogram" + depends on PREEMPT_TRACER + help + This option uses the infrastructure of the critical + preemption off timings to create a histogram of latencies. + +config WAKEUP_LATENCY_HIST + bool "Interrupts off critical timings histogram" + select TRACING + select MARKERS + help + This option uses the infrastructure of the wakeup tracer + to create a histogram of latencies. Index: linux-2.6.26/kernel/trace/Makefile =================================================================== --- linux-2.6.26.orig/kernel/trace/Makefile +++ linux-2.6.26/kernel/trace/Makefile @@ -20,4 +20,8 @@ obj-$(CONFIG_PREEMPT_TRACER) += trace_ir obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o obj-$(CONFIG_EVENT_TRACER) += trace_events.o +obj-$(CONFIG_INTERRUPT_OFF_HIST) += trace_hist.o +obj-$(CONFIG_PREEMPT_OFF_HIST) += trace_hist.o +obj-$(CONFIG_WAKEUP_LATENCY_HIST) += trace_hist.o + libftrace-y := ftrace.o Index: linux-2.6.26/kernel/trace/trace_hist.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/trace_hist.c @@ -0,0 +1,638 @@ +/* + * kernel/trace/trace_hist.c + * + * Add support for histograms of preemption-off latency and + * interrupt-off latency and wakeup latency, it depends on + * Real-Time Preemption Support. + * + * Copyright (C) 2005 MontaVista Software, Inc. + * Yi Yang + * + * Converted to work with the new latency tracer. + * Copyright (C) 2008 Red Hat, Inc. + * Steven Rostedt + * + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "trace.h" +#include "trace_hist.h" + +enum { + INTERRUPT_LATENCY = 0, + PREEMPT_LATENCY, + PREEMPT_INTERRUPT_LATENCY, + WAKEUP_LATENCY, +}; + +#define MAX_ENTRY_NUM 10240 + +struct hist_data { + atomic_t hist_mode; /* 0 log, 1 don't log */ + unsigned long min_lat; + unsigned long avg_lat; + unsigned long max_lat; + unsigned long long beyond_hist_bound_samples; + unsigned long long accumulate_lat; + unsigned long long total_samples; + unsigned long long hist_array[MAX_ENTRY_NUM]; +}; + +static char *latency_hist_dir_root = "latency_hist"; + +#ifdef CONFIG_INTERRUPT_OFF_HIST +static DEFINE_PER_CPU(struct hist_data, interrupt_off_hist); +static char *interrupt_off_hist_dir = "interrupt_off_latency"; +#endif + +#ifdef CONFIG_PREEMPT_OFF_HIST +static DEFINE_PER_CPU(struct hist_data, preempt_off_hist); +static char *preempt_off_hist_dir = "preempt_off_latency"; +#endif + +#if defined(CONFIG_PREEMPT_OFF_HIST) && defined(CONFIG_INTERRUPT_OFF_HIST) +static DEFINE_PER_CPU(struct hist_data, preempt_irqs_off_hist); +static char *preempt_irqs_off_hist_dir = "preempt_interrupts_off_latency"; +#endif + +#ifdef CONFIG_WAKEUP_LATENCY_HIST +static DEFINE_PER_CPU(struct hist_data, wakeup_latency_hist); +static char *wakeup_latency_hist_dir = "wakeup_latency"; +#endif + +static inline u64 u64_div(u64 x, u64 y) +{ + do_div(x, y); + return x; +} + +void notrace latency_hist(int latency_type, int cpu, unsigned long latency) +{ + struct hist_data *my_hist; + + if ((cpu < 0) || (cpu >= NR_CPUS) || (latency_type < INTERRUPT_LATENCY) + || (latency_type > WAKEUP_LATENCY) || (latency < 0)) + return; + + switch (latency_type) { +#ifdef CONFIG_INTERRUPT_OFF_HIST + case INTERRUPT_LATENCY: + my_hist = &per_cpu(interrupt_off_hist, cpu); + break; +#endif + +#ifdef CONFIG_PREEMPT_OFF_HIST + case PREEMPT_LATENCY: + my_hist = &per_cpu(preempt_off_hist, cpu); + break; +#endif + +#if defined(CONFIG_PREEMPT_OFF_HIST) && defined(CONFIG_INTERRUPT_OFF_HIST) + case PREEMPT_INTERRUPT_LATENCY: + my_hist = &per_cpu(preempt_irqs_off_hist, cpu); + break; +#endif + +#ifdef CONFIG_WAKEUP_LATENCY_HIST + case WAKEUP_LATENCY: + my_hist = &per_cpu(wakeup_latency_hist, cpu); + break; +#endif + default: + return; + } + + if (atomic_read(&my_hist->hist_mode) == 0) + return; + + if (latency >= MAX_ENTRY_NUM) + my_hist->beyond_hist_bound_samples++; + else + my_hist->hist_array[latency]++; + + if (latency < my_hist->min_lat) + my_hist->min_lat = latency; + else if (latency > my_hist->max_lat) + my_hist->max_lat = latency; + + my_hist->total_samples++; + my_hist->accumulate_lat += latency; + my_hist->avg_lat = (unsigned long) u64_div(my_hist->accumulate_lat, + my_hist->total_samples); + return; +} + +static void *l_start(struct seq_file *m, loff_t *pos) +{ + loff_t *index_ptr = kmalloc(sizeof(loff_t), GFP_KERNEL); + loff_t index = *pos; + struct hist_data *my_hist = m->private; + + if (!index_ptr) + return NULL; + + if (index == 0) { + atomic_dec(&my_hist->hist_mode); + seq_printf(m, "#Minimum latency: %lu microseconds.\n" + "#Average latency: %lu microseconds.\n" + "#Maximum latency: %lu microseconds.\n" + "#Total samples: %llu\n" + "#There are %llu samples greater or equal" + " than %d microseconds\n" + "#usecs\t%16s\n" + , my_hist->min_lat + , my_hist->avg_lat + , my_hist->max_lat + , my_hist->total_samples + , my_hist->beyond_hist_bound_samples + , MAX_ENTRY_NUM, "samples"); + } + if (index >= MAX_ENTRY_NUM) + return NULL; + + *index_ptr = index; + return index_ptr; +} + +static void *l_next(struct seq_file *m, void *p, loff_t *pos) +{ + loff_t *index_ptr = p; + struct hist_data *my_hist = m->private; + + if (++*pos >= MAX_ENTRY_NUM) { + atomic_inc(&my_hist->hist_mode); + return NULL; + } + *index_ptr = *pos; + return index_ptr; +} + +static void l_stop(struct seq_file *m, void *p) +{ + kfree(p); +} + +static int l_show(struct seq_file *m, void *p) +{ + int index = *(loff_t *) p; + struct hist_data *my_hist = m->private; + + seq_printf(m, "%5d\t%16llu\n", index, my_hist->hist_array[index]); + return 0; +} + +static struct seq_operations latency_hist_seq_op = { + .start = l_start, + .next = l_next, + .stop = l_stop, + .show = l_show +}; + +static int latency_hist_open(struct inode *inode, struct file *file) +{ + int ret; + + ret = seq_open(file, &latency_hist_seq_op); + if (!ret) { + struct seq_file *seq = file->private_data; + seq->private = inode->i_private; + } + return ret; +} + +static struct file_operations latency_hist_fops = { + .open = latency_hist_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static void hist_reset(struct hist_data *hist) +{ + atomic_dec(&hist->hist_mode); + + memset(hist->hist_array, 0, sizeof(hist->hist_array)); + hist->beyond_hist_bound_samples = 0UL; + hist->min_lat = 0xFFFFFFFFUL; + hist->max_lat = 0UL; + hist->total_samples = 0UL; + hist->accumulate_lat = 0UL; + hist->avg_lat = 0UL; + + atomic_inc(&hist->hist_mode); +} + +ssize_t latency_hist_reset(struct file *file, const char __user *a, + size_t size, loff_t *off) +{ + int cpu; + struct hist_data *hist; + int latency_type = (long)file->private_data; + + switch (latency_type) { + +#ifdef CONFIG_WAKEUP_LATENCY_HIST + case WAKEUP_LATENCY: + for_each_online_cpu(cpu) { + hist = &per_cpu(wakeup_latency_hist, cpu); + hist_reset(hist); + } + break; +#endif + +#ifdef CONFIG_PREEMPT_OFF_HIST + case PREEMPT_LATENCY: + for_each_online_cpu(cpu) { + hist = &per_cpu(preempt_off_hist, cpu); + hist_reset(hist); + } + break; +#endif + +#ifdef CONFIG_INTERRUPT_OFF_HIST + case INTERRUPT_LATENCY: + for_each_online_cpu(cpu) { + hist = &per_cpu(interrupt_off_hist, cpu); + hist_reset(hist); + } + break; +#endif + +#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST) + case PREEMPT_INTERRUPT_LATENCY: + for_each_online_cpu(cpu) { + hist = &per_cpu(preempt_irqs_off_hist, cpu); + hist_reset(hist); + } + break; +#endif + } + + return size; +} + +static struct file_operations latency_hist_reset_fops = { + .open = tracing_open_generic, + .write = latency_hist_reset, +}; + +#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST) +#ifdef CONFIG_INTERRUPT_OFF_HIST +static DEFINE_PER_CPU(cycles_t, hist_irqsoff_start); +static DEFINE_PER_CPU(int, hist_irqsoff_tracing); +#endif +#ifdef CONFIG_PREEMPT_OFF_HIST +static DEFINE_PER_CPU(cycles_t, hist_preemptoff_start); +static DEFINE_PER_CPU(int, hist_preemptoff_tracing); +#endif +#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST) +static DEFINE_PER_CPU(cycles_t, hist_preemptirqsoff_start); +static DEFINE_PER_CPU(int, hist_preemptirqsoff_tracing); +#endif + +notrace void tracing_hist_preempt_start(void) +{ + cycle_t uninitialized_var(start); + int start_set = 0; + int cpu; + + if (!preempt_count() && !irqs_disabled()) + return; + + /* cpu is only used if we are in atomic */ + cpu = raw_smp_processor_id(); + +#ifdef CONFIG_INTERRUPT_OFF_HIST + if (irqs_disabled() && + !per_cpu(hist_irqsoff_tracing, cpu)) { + per_cpu(hist_irqsoff_tracing, cpu) = 1; + start_set++; + start = ftrace_now(cpu); + per_cpu(hist_irqsoff_start, cpu) = start; + } +#endif + +#ifdef CONFIG_PREEMPT_OFF_HIST + if (preempt_count() && + !per_cpu(hist_preemptoff_tracing, cpu)) { + per_cpu(hist_preemptoff_tracing, cpu) = 1; + if (1 || !(start_set++)) + start = ftrace_now(cpu); + per_cpu(hist_preemptoff_start, cpu) = start; + + } +#endif + +#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST) + if (!per_cpu(hist_preemptirqsoff_tracing, cpu)) { + per_cpu(hist_preemptirqsoff_tracing, cpu) = 1; + if (1 || !(start_set)) + start = ftrace_now(cpu); + per_cpu(hist_preemptirqsoff_start, cpu) = start; + } +#endif +} + +notrace void tracing_hist_preempt_stop(int irqs_on) +{ + long latency; + cycle_t start; + cycle_t uninitialized_var(stop); + int stop_set = 0; + int cpu; + + /* irqs_on == TRACE_STOP if we must stop tracing. */ + + /* cpu is only used if we are in atomic */ + cpu = raw_smp_processor_id(); + +#ifdef CONFIG_INTERRUPT_OFF_HIST + if (irqs_on && + per_cpu(hist_irqsoff_tracing, cpu)) { + stop = ftrace_now(cpu); + stop_set++; + start = per_cpu(hist_irqsoff_start, cpu); + latency = (long)nsecs_to_usecs(stop - start); + if (latency > 1000000) { + printk("%d: latency = %ld (%lu)\n", __LINE__, latency, latency); + printk("%d: start=%Ld stop=%Ld\n", __LINE__, start, stop); + } + barrier(); + per_cpu(hist_irqsoff_tracing, cpu) = 0; + latency_hist(INTERRUPT_LATENCY, cpu, latency); + } +#endif + +#ifdef CONFIG_PREEMPT_OFF_HIST + if ((!irqs_on || irqs_on == TRACE_STOP) && + per_cpu(hist_preemptoff_tracing, cpu)) { + WARN_ON(!preempt_count()); + if (1 || !(stop_set++)) + stop = ftrace_now(cpu); + start = per_cpu(hist_preemptoff_start, cpu); + latency = (long)nsecs_to_usecs(stop - start); + if (latency > 1000000) { + printk("%d: latency = %ld (%lu)\n", __LINE__, latency, latency); + printk("%d: start=%Ld stop=%Ld\n", __LINE__, start, stop); + } + barrier(); + per_cpu(hist_preemptoff_tracing, cpu) = 0; + latency_hist(PREEMPT_LATENCY, cpu, latency); + } +#endif + +#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST) + if (((!irqs_on && !irqs_disabled()) || + (irqs_on && !preempt_count()) || + (irqs_on == TRACE_STOP)) && + per_cpu(hist_preemptirqsoff_tracing, cpu)) { + WARN_ON(!preempt_count() && !irqs_disabled()); + if (1 || !stop_set) + stop = ftrace_now(cpu); + start = per_cpu(hist_preemptirqsoff_start, cpu); + latency = (long)nsecs_to_usecs(stop - start); + if (latency > 1000000) { + printk("%d: latency = %ld (%lu)\n", __LINE__, latency, latency); + printk("%d: start=%Ld stop=%Ld\n", __LINE__, start, stop); + } + barrier(); + per_cpu(hist_preemptirqsoff_tracing, cpu) = 0; + latency_hist(PREEMPT_INTERRUPT_LATENCY, cpu, latency); + } +#endif +} +#endif + +#ifdef CONFIG_WAKEUP_LATENCY_HIST +int tracing_wakeup_hist __read_mostly = 1; + +static unsigned wakeup_prio = (unsigned)-1 ; +static struct task_struct *wakeup_task; +static cycle_t wakeup_start; +static DEFINE_SPINLOCK(wakeup_lock); + +notrace void tracing_hist_wakeup_start(struct task_struct *p, + struct task_struct *curr) +{ + unsigned long flags; + + if (likely(!rt_task(p)) || + p->prio >= wakeup_prio || + p->prio >= curr->prio) + return; + + spin_lock_irqsave(&wakeup_lock, flags); + if (wakeup_task) + put_task_struct(wakeup_task); + + get_task_struct(p); + wakeup_task = p; + wakeup_prio = p->prio; + wakeup_start = ftrace_now(raw_smp_processor_id()); + spin_unlock_irqrestore(&wakeup_lock, flags); +} + +notrace void tracing_hist_wakeup_stop(struct task_struct *next) +{ + unsigned long flags; + long latency; + cycle_t stop; + + if (next != wakeup_task) + return; + + stop = ftrace_now(raw_smp_processor_id()); + + spin_lock_irqsave(&wakeup_lock, flags); + if (wakeup_task != next) + goto out; + + latency = (long)nsecs_to_usecs(stop - wakeup_start); + + latency_hist(WAKEUP_LATENCY, smp_processor_id(), latency); + + put_task_struct(wakeup_task); + wakeup_task = NULL; + wakeup_prio = (unsigned)-1; + out: + spin_unlock_irqrestore(&wakeup_lock, flags); + +} + +static void +sched_switch_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct task_struct *prev; + struct task_struct *next; + struct rq *__rq; + + /* skip prev_pid %d next_pid %d prev_state %ld */ + (void)va_arg(*args, int); + (void)va_arg(*args, int); + (void)va_arg(*args, long); + __rq = va_arg(*args, typeof(__rq)); + prev = va_arg(*args, typeof(prev)); + next = va_arg(*args, typeof(next)); + + tracing_hist_wakeup_stop(next); +} + +static void +wake_up_callback(void *probe_data, void *call_data, + const char *format, va_list *args) +{ + struct task_struct *curr; + struct task_struct *task; + struct rq *__rq; + + /* Skip pid %d state %ld */ + (void)va_arg(*args, int); + (void)va_arg(*args, long); + /* now get the meat: "rq %p task %p rq->curr %p" */ + __rq = va_arg(*args, typeof(__rq)); + task = va_arg(*args, typeof(task)); + curr = va_arg(*args, typeof(curr)); + + tracing_hist_wakeup_start(task, curr); +} + +#endif + +static __init int latency_hist_init(void) +{ + struct dentry *latency_hist_root = NULL; + struct dentry *dentry; + struct dentry *entry; + int i = 0, len = 0; + struct hist_data *my_hist; + char name[64]; + + dentry = tracing_init_dentry(); + + latency_hist_root = + debugfs_create_dir(latency_hist_dir_root, dentry); + +#ifdef CONFIG_INTERRUPT_OFF_HIST + dentry = debugfs_create_dir(interrupt_off_hist_dir, + latency_hist_root); + for_each_possible_cpu(i) { + len = sprintf(name, "CPU%d", i); + name[len] = '\0'; + entry = debugfs_create_file(name, 0444, dentry, + &per_cpu(interrupt_off_hist, i), + &latency_hist_fops); + my_hist = &per_cpu(interrupt_off_hist, i); + atomic_set(&my_hist->hist_mode, 1); + my_hist->min_lat = 0xFFFFFFFFUL; + } + entry = debugfs_create_file("reset", 0444, dentry, + (void *)INTERRUPT_LATENCY, + &latency_hist_reset_fops); +#endif + +#ifdef CONFIG_PREEMPT_OFF_HIST + dentry = debugfs_create_dir(preempt_off_hist_dir, + latency_hist_root); + for_each_possible_cpu(i) { + len = sprintf(name, "CPU%d", i); + name[len] = '\0'; + entry = debugfs_create_file(name, 0444, dentry, + &per_cpu(preempt_off_hist, i), + &latency_hist_fops); + my_hist = &per_cpu(preempt_off_hist, i); + atomic_set(&my_hist->hist_mode, 1); + my_hist->min_lat = 0xFFFFFFFFUL; + } + entry = debugfs_create_file("reset", 0444, dentry, + (void *)PREEMPT_LATENCY, + &latency_hist_reset_fops); +#endif + +#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST) + dentry = debugfs_create_dir(preempt_irqs_off_hist_dir, + latency_hist_root); + for_each_possible_cpu(i) { + len = sprintf(name, "CPU%d", i); + name[len] = '\0'; + entry = debugfs_create_file(name, 0444, dentry, + &per_cpu(preempt_off_hist, i), + &latency_hist_fops); + my_hist = &per_cpu(preempt_irqs_off_hist, i); + atomic_set(&my_hist->hist_mode, 1); + my_hist->min_lat = 0xFFFFFFFFUL; + } + entry = debugfs_create_file("reset", 0444, dentry, + (void *)PREEMPT_INTERRUPT_LATENCY, + &latency_hist_reset_fops); +#endif + +#ifdef CONFIG_WAKEUP_LATENCY_HIST + + i = marker_probe_register("kernel_sched_wakeup", + "pid %d state %ld ## rq %p task %p rq->curr %p", + wake_up_callback, NULL); + if (i) { + pr_info("wakeup hist: Couldn't add marker" + " probe to kernel_sched_wakeup\n"); + goto out_wake; + } + + i = marker_probe_register("kernel_sched_wakeup_new", + "pid %d state %ld ## rq %p task %p rq->curr %p", + wake_up_callback, NULL); + if (i) { + pr_info("wakeup hist: Couldn't add marker" + " probe to kernel_sched_wakeup_new\n"); + goto fail_deprobe; + } + + i = marker_probe_register("kernel_sched_schedule", + "prev_pid %d next_pid %d prev_state %ld " + "## rq %p prev %p next %p", + sched_switch_callback, NULL); + if (i) { + pr_info("wakeup hist: Couldn't add marker" + " probe to kernel_sched_schedule\n"); + goto fail_deprobe_wake_new; + } + + dentry = debugfs_create_dir(wakeup_latency_hist_dir, + latency_hist_root); + for_each_possible_cpu(i) { + len = sprintf(name, "CPU%d", i); + name[len] = '\0'; + entry = debugfs_create_file(name, 0444, dentry, + &per_cpu(wakeup_latency_hist, i), + &latency_hist_fops); + my_hist = &per_cpu(wakeup_latency_hist, i); + atomic_set(&my_hist->hist_mode, 1); + my_hist->min_lat = 0xFFFFFFFFUL; + } + entry = debugfs_create_file("reset", 0444, dentry, + (void *)WAKEUP_LATENCY, + &latency_hist_reset_fops); + + goto out_wake; + +fail_deprobe_wake_new: + marker_probe_unregister("kernel_sched_wakeup_new", + wake_up_callback, NULL); +fail_deprobe: + marker_probe_unregister("kernel_sched_wakeup", + wake_up_callback, NULL); + out_wake: +#endif + return 0; + +} + +__initcall(latency_hist_init); Index: linux-2.6.26/kernel/trace/trace_hist.h =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/trace_hist.h @@ -0,0 +1,39 @@ +/* + * kernel/trace/trace_hist.h + * + * Add support for histograms of preemption-off latency and + * interrupt-off latency and wakeup latency, it depends on + * Real-Time Preemption Support. + * + * Copyright (C) 2005 MontaVista Software, Inc. + * Yi Yang + * + * Converted to work with the new latency tracer. + * Copyright (C) 2008 Red Hat, Inc. + * Steven Rostedt + * + */ +#ifndef _LIB_TRACING_TRACER_HIST_H_ +#define _LIB_TRACING_TRACER_HIST_H_ + +#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST) +# define TRACE_STOP 2 +void tracing_hist_preempt_start(void); +void tracing_hist_preempt_stop(int irqs_on); +#else +# define tracing_hist_preempt_start() do { } while (0) +# define tracing_hist_preempt_stop(irqs_off) do { } while (0) +#endif + +#ifdef CONFIG_WAKEUP_LATENCY_HIST +void tracing_hist_wakeup_start(struct task_struct *p, + struct task_struct *curr); +void tracing_hist_wakeup_stop(struct task_struct *next); +extern int tracing_wakeup_hist; +#else +# define tracing_hist_wakeup_start(p, curr) do { } while (0) +# define tracing_hist_wakeup_stop(next) do { } while (0) +# define tracing_wakeup_hist 0 +#endif + +#endif /* ifndef _LIB_TRACING_TRACER_HIST_H_ */ Index: linux-2.6.26/kernel/trace/trace_irqsoff.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace_irqsoff.c +++ linux-2.6.26/kernel/trace/trace_irqsoff.c @@ -17,6 +17,7 @@ #include #include "trace.h" +#include "trace_hist.h" static struct trace_array *irqsoff_trace __read_mostly; static int tracer_enabled __read_mostly; @@ -252,10 +253,14 @@ void start_critical_timings(void) { if (preempt_trace() || irq_trace()) start_critical_timing(CALLER_ADDR0, CALLER_ADDR1); + + tracing_hist_preempt_start(); } void stop_critical_timings(void) { + tracing_hist_preempt_stop(TRACE_STOP); + if (preempt_trace() || irq_trace()) stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1); } @@ -264,6 +269,8 @@ void stop_critical_timings(void) #ifdef CONFIG_PROVE_LOCKING void time_hardirqs_on(unsigned long a0, unsigned long a1) { + tracing_hist_preempt_stop(1); + if (!preempt_trace() && irq_trace()) stop_critical_timing(a0, a1); } @@ -272,6 +279,8 @@ void time_hardirqs_off(unsigned long a0, { if (!preempt_trace() && irq_trace()) start_critical_timing(a0, a1); + + tracing_hist_preempt_start(); } #else /* !CONFIG_PROVE_LOCKING */ @@ -305,6 +314,8 @@ inline void print_irqtrace_events(struct */ void trace_hardirqs_on(void) { + tracing_hist_preempt_stop(1); + if (!preempt_trace() && irq_trace()) stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1); } @@ -314,11 +325,15 @@ void trace_hardirqs_off(void) { if (!preempt_trace() && irq_trace()) start_critical_timing(CALLER_ADDR0, CALLER_ADDR1); + + tracing_hist_preempt_start(); } EXPORT_SYMBOL(trace_hardirqs_off); void trace_hardirqs_on_caller(unsigned long caller_addr) { + tracing_hist_preempt_stop(1); + if (!preempt_trace() && irq_trace()) stop_critical_timing(CALLER_ADDR0, caller_addr); } @@ -328,6 +343,8 @@ void trace_hardirqs_off_caller(unsigned { if (!preempt_trace() && irq_trace()) start_critical_timing(CALLER_ADDR0, caller_addr); + + tracing_hist_preempt_start(); } EXPORT_SYMBOL(trace_hardirqs_off_caller); @@ -337,12 +354,14 @@ EXPORT_SYMBOL(trace_hardirqs_off_caller) #ifdef CONFIG_PREEMPT_TRACER void trace_preempt_on(unsigned long a0, unsigned long a1) { + tracing_hist_preempt_stop(0); stop_critical_timing(a0, a1); } void trace_preempt_off(unsigned long a0, unsigned long a1) { start_critical_timing(a0, a1); + tracing_hist_preempt_start(); } #endif /* CONFIG_PREEMPT_TRACER */ patches/trace_hist-divzero.patch0000664000076400007640000000550411043564057016074 0ustar tglxtglxDate: Tue, 27 May 2008 03:21:25 +0200 From: Carsten Emde To: Steven Rostedt Cc: Thomas Gleixner Subject: trace_hist.c: divide-by-zero problem (2) Parts/Attachments: 1 Shown 20 lines Text 2 Shown 86 lines Text ---------------------------------------- Steven, do we really need to continuously calculate the average latency and spend lots of time in the division function? I don't think so. It is probably sufficient to calculate the average latency only when we display it. What do you think? Carsten. The division function of a 64-bit divisor divided by a 64-bit dividend to calculate the average latency may be time-consuming on a 32-bit system. We, therefore, no longer calculate the average whenever a new latency value is added but only when we display the histogram data. Signed-off-by: Carsten Emde --- kernel/trace/trace_hist.c | 21 ++++++++------------- 1 file changed, 8 insertions(+), 13 deletions(-) Index: linux-2.6.26/kernel/trace/trace_hist.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace_hist.c +++ linux-2.6.26/kernel/trace/trace_hist.c @@ -17,7 +17,6 @@ #include #include #include -#include #include #include #include @@ -68,15 +67,10 @@ static DEFINE_PER_CPU(struct hist_data, static char *wakeup_latency_hist_dir = "wakeup_latency"; #endif -static inline u64 u64_div(u64 x, u64 y) -{ - do_div(x, y); - return x; -} - void notrace latency_hist(int latency_type, int cpu, unsigned long latency) { struct hist_data *my_hist; + unsigned long long total_samples; if ((cpu < 0) || (cpu >= NR_CPUS) || (latency_type < INTERRUPT_LATENCY) || (latency_type > WAKEUP_LATENCY) || (latency < 0)) @@ -123,10 +117,11 @@ void notrace latency_hist(int latency_ty else if (latency > my_hist->max_lat) my_hist->max_lat = latency; - my_hist->total_samples++; + total_samples = my_hist->total_samples++; my_hist->accumulate_lat += latency; - my_hist->avg_lat = (unsigned long) u64_div(my_hist->accumulate_lat, - my_hist->total_samples); + if (likely(total_samples)) + my_hist->avg_lat = (unsigned long) + div64_u64(my_hist->accumulate_lat, total_samples); return; } @@ -220,11 +215,11 @@ static void hist_reset(struct hist_data atomic_dec(&hist->hist_mode); memset(hist->hist_array, 0, sizeof(hist->hist_array)); - hist->beyond_hist_bound_samples = 0UL; + hist->beyond_hist_bound_samples = 0ULL; hist->min_lat = 0xFFFFFFFFUL; hist->max_lat = 0UL; - hist->total_samples = 0UL; - hist->accumulate_lat = 0UL; + hist->total_samples = 0ULL; + hist->accumulate_lat = 0ULL; hist->avg_lat = 0UL; atomic_inc(&hist->hist_mode); patches/event-tracer-syscall-x86_64.patch0000664000076400007640000000747211043564057017300 0ustar tglxtglxAdd hooks to x86 to track syscalls for event trace. This code was taken from the work by Ingo Molnar. Signed-off-by: Steven Rostedt --- arch/x86/ia32/ia32entry.S | 9 +++++++ arch/x86/kernel/entry_64.S | 4 +++ include/asm-x86/calling.h | 50 ++++++++++++++++++++++++++++++++++++++++++++ include/asm-x86/unistd_64.h | 2 + 4 files changed, 64 insertions(+), 1 deletion(-) Index: linux-2.6.26/arch/x86/ia32/ia32entry.S =================================================================== --- linux-2.6.26.orig/arch/x86/ia32/ia32entry.S +++ linux-2.6.26/arch/x86/ia32/ia32entry.S @@ -131,7 +131,9 @@ sysenter_do_call: cmpl $(IA32_NR_syscalls-1),%eax ja ia32_badsys IA32_ARG_FIXUP 1 + TRACE_SYS_IA32_CALL call *ia32_sys_call_table(,%rax,8) + TRACE_SYS_RET movq %rax,RAX-ARGOFFSET(%rsp) GET_THREAD_INFO(%r10) cli @@ -238,7 +240,9 @@ cstar_do_call: cmpl $IA32_NR_syscalls-1,%eax ja ia32_badsys IA32_ARG_FIXUP 1 + TRACE_SYS_IA32_CALL call *ia32_sys_call_table(,%rax,8) + TRACE_SYS_RET movq %rax,RAX-ARGOFFSET(%rsp) GET_THREAD_INFO(%r10) cli @@ -331,8 +335,10 @@ ia32_do_syscall: cmpl $(IA32_NR_syscalls-1),%eax ja int_ret_from_sys_call /* ia32_tracesys has set RAX(%rsp) */ IA32_ARG_FIXUP + TRACE_SYS_IA32_CALL call *ia32_sys_call_table(,%rax,8) # xxx: rip relative ia32_sysret: + TRACE_SYS_RET movq %rax,RAX-ARGOFFSET(%rsp) jmp int_ret_from_sys_call @@ -403,7 +409,7 @@ END(ia32_ptregs_common) .section .rodata,"a" .align 8 -ia32_sys_call_table: +ENTRY(ia32_sys_call_table) .quad sys_restart_syscall .quad sys_exit .quad stub32_fork @@ -731,4 +737,5 @@ ia32_sys_call_table: .quad sys32_fallocate .quad compat_sys_timerfd_settime /* 325 */ .quad compat_sys_timerfd_gettime +.globl ia32_syscall_end ia32_syscall_end: Index: linux-2.6.26/arch/x86/kernel/entry_64.S =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/entry_64.S +++ linux-2.6.26/arch/x86/kernel/entry_64.S @@ -357,7 +357,9 @@ ENTRY(system_call_after_swapgs) cmpq $__NR_syscall_max,%rax ja badsys movq %r10,%rcx + TRACE_SYS_CALL call *sys_call_table(,%rax,8) # XXX: rip relative + TRACE_SYS_RET movq %rax,RAX-ARGOFFSET(%rsp) /* * Syscall return path ending with SYSRET (fast path) @@ -436,7 +438,9 @@ tracesys: cmpq $__NR_syscall_max,%rax ja int_ret_from_sys_call /* RAX(%rsp) set to -ENOSYS above */ movq %r10,%rcx /* fixup for C */ + TRACE_SYS_CALL call *sys_call_table(,%rax,8) + TRACE_SYS_RET movq %rax,RAX-ARGOFFSET(%rsp) /* Use IRET because user could have changed frame */ Index: linux-2.6.26/include/asm-x86/calling.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/calling.h +++ linux-2.6.26/include/asm-x86/calling.h @@ -166,3 +166,53 @@ .byte 0xf1 .endm + +/* + * latency-tracing helpers: + */ + + .macro TRACE_SYS_CALL + +#ifdef CONFIG_EVENT_TRACER + SAVE_ARGS + + mov %rdx, %rcx + mov %rsi, %rdx + mov %rdi, %rsi + mov %rax, %rdi + + call sys_call + + RESTORE_ARGS +#endif + .endm + + + .macro TRACE_SYS_IA32_CALL + +#ifdef CONFIG_EVENT_TRACER + SAVE_ARGS + + mov %rdx, %rcx + mov %rsi, %rdx + mov %rdi, %rsi + mov %rax, %rdi + + call sys_ia32_call + + RESTORE_ARGS +#endif + .endm + + .macro TRACE_SYS_RET + +#ifdef CONFIG_EVENT_TRACER + SAVE_ARGS + + mov %rax, %rdi + + call sys_ret + + RESTORE_ARGS +#endif + .endm Index: linux-2.6.26/include/asm-x86/unistd_64.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/unistd_64.h +++ linux-2.6.26/include/asm-x86/unistd_64.h @@ -11,6 +11,8 @@ * Note: holes are not allowed. */ +#define NR_syscalls (__NR_syscall_max+1) + /* at least 8 syscall per cacheline */ #define __NR_read 0 __SYSCALL(__NR_read, sys_read) patches/event-tracer-syscall-i386.patch0000664000076400007640000000352111043564057017022 0ustar tglxtglxhooks into i386 to track event calls. This code was taken from the work by Ingo Molnar. Signed-off-by: Steven Rostedt --- arch/x86/kernel/entry_32.S | 15 +++++++++++++++ include/asm-x86/unistd_32.h | 2 ++ 2 files changed, 17 insertions(+) Index: linux-2.6.26/arch/x86/kernel/entry_32.S =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/entry_32.S +++ linux-2.6.26/arch/x86/kernel/entry_32.S @@ -314,6 +314,11 @@ sysenter_past_esp: pushl %eax CFI_ADJUST_CFA_OFFSET 4 SAVE_ALL +#ifdef CONFIG_EVENT_TRACE + pushl %edx; pushl %ecx; pushl %ebx; pushl %eax + call sys_call + popl %eax; popl %ebx; popl %ecx; popl %edx +#endif ENABLE_INTERRUPTS(CLBR_NONE) /* @@ -344,6 +349,11 @@ sysenter_past_esp: movl TI_flags(%ebp), %ecx testw $_TIF_ALLWORK_MASK, %cx jne syscall_exit_work +#ifdef CONFIG_EVENT_TRACE + pushl %eax + call sys_ret + popl %eax +#endif /* if something modifies registers it must also disable sysexit */ movl PT_EIP(%esp), %edx movl PT_OLDESP(%esp), %ecx @@ -367,6 +377,11 @@ ENTRY(system_call) pushl %eax # save orig_eax CFI_ADJUST_CFA_OFFSET 4 SAVE_ALL +#ifdef CONFIG_EVENT_TRACE + pushl %edx; pushl %ecx; pushl %ebx; pushl %eax + call sys_call + popl %eax; popl %ebx; popl %ecx; popl %edx +#endif GET_THREAD_INFO(%ebp) # system call tracing in operation / emulation /* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */ Index: linux-2.6.26/include/asm-x86/unistd_32.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/unistd_32.h +++ linux-2.6.26/include/asm-x86/unistd_32.h @@ -333,6 +333,8 @@ #define __NR_timerfd_settime 325 #define __NR_timerfd_gettime 326 +#define NR_syscalls 327 + #ifdef __KERNEL__ #define __ARCH_WANT_IPC_PARSE_VERSION patches/trace-events-handle-syscalls.patch0000664000076400007640000002134411043564057017753 0ustar tglxtglxAdd syscall tracing in event trace. Signed-off-by: Steven Rostedt --- kernel/trace/trace.c | 104 ++++++++++++++++++++++++++++++++++++++++++ kernel/trace/trace.h | 30 ++++++++++++ kernel/trace/trace_events.c | 92 +++++++++++++++++++++++++++++++++++++ kernel/trace/trace_selftest.c | 2 4 files changed, 228 insertions(+) Index: linux-2.6.26/kernel/trace/trace.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace.c +++ linux-2.6.26/kernel/trace/trace.c @@ -32,6 +32,9 @@ #include +#include +#include + #include "trace.h" unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; @@ -1095,6 +1098,42 @@ void tracing_event_task_deactivate(struc entry->task.cpu = task_cpu; } +void tracing_event_syscall(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + unsigned long nr, + unsigned long p1, + unsigned long p2, + unsigned long p3) +{ + struct trace_entry *entry; + + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_SYSCALL; + entry->syscall.ip = ip; + entry->syscall.nr = nr; + entry->syscall.p1 = p1; + entry->syscall.p2 = p2; + entry->syscall.p3 = p3; +} + +void tracing_event_sysret(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + unsigned long ret) +{ + struct trace_entry *entry; + + entry = tracing_get_trace_entry(tr, data); + tracing_generic_entry_update(entry, flags); + entry->type = TRACE_SYSRET; + entry->sysret.ip = ip; + entry->sysret.ret = ret; +} + #ifdef CONFIG_FTRACE static void function_trace_call(unsigned long ip, unsigned long parent_ip) @@ -1559,6 +1598,13 @@ lat_print_timestamp(struct trace_seq *s, static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; +extern unsigned long sys_call_table[NR_syscalls]; + +#if defined(CONFIG_COMPAT) && defined(CONFIG_X86) +extern unsigned long ia32_sys_call_table[], ia32_syscall_end[]; +# define IA32_NR_syscalls (ia32_syscall_end - ia32_sys_call_table) +#endif + static int print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) { @@ -1569,6 +1615,7 @@ print_lat_fmt(struct trace_iterator *ite struct trace_entry *entry = iter->ent; unsigned long abs_usecs; unsigned long rel_usecs; + unsigned long nr; char *comm; int S, T; int i; @@ -1683,6 +1730,34 @@ print_lat_fmt(struct trace_iterator *ite comm, entry->task.pid, entry->task.prio, entry->task.cpu); break; + case TRACE_SYSCALL: + seq_print_ip_sym(s, entry->syscall.ip, sym_flags); + nr = entry->syscall.nr; + trace_seq_putc(s, ' '); +#if defined(CONFIG_COMPAT) && defined(CONFIG_X86) + if (nr & 0x80000000) { + nr &= ~0x80000000; + if (nr < IA32_NR_syscalls) + seq_print_ip_sym(s, ia32_sys_call_table[nr], 0); + else + trace_seq_printf(s, "", nr); + } else +#endif + if (nr < NR_syscalls) + seq_print_ip_sym(s, sys_call_table[nr], 0); + else + trace_seq_printf(s, "", nr); + + trace_seq_printf(s, " (%lx %lx %lx)\n", + entry->syscall.p1, + entry->syscall.p2, + entry->syscall.p3); + break; + case TRACE_SYSRET: + seq_print_ip_sym(s, entry->sysret.ip, sym_flags); + trace_seq_printf(s, " < (%ld)\n", + entry->sysret.ret); + break; default: trace_seq_printf(s, "Unknown type %d\n", entry->type); } @@ -1697,6 +1772,7 @@ static int print_trace_fmt(struct trace_ unsigned long usec_rem; unsigned long long t; unsigned long secs; + long nr; char *comm; int ret; int S, T; @@ -1832,6 +1908,34 @@ static int print_trace_fmt(struct trace_ comm, entry->task.pid, entry->task.prio, entry->task.cpu); break; + case TRACE_SYSCALL: + seq_print_ip_sym(s, entry->syscall.ip, sym_flags); + nr = entry->syscall.nr; + trace_seq_putc(s, ' '); +#if defined(CONFIG_COMPAT) && defined(CONFIG_X86) + if (nr & 0x80000000) { + nr &= ~0x80000000; + if (nr < IA32_NR_syscalls) + seq_print_ip_sym(s, ia32_sys_call_table[nr], 0); + else + trace_seq_printf(s, "", nr); + } else +#endif + if (nr < NR_syscalls) + seq_print_ip_sym(s, sys_call_table[nr], 0); + else + trace_seq_printf(s, "", nr); + + trace_seq_printf(s, " (%lx %lx %lx)\n", + entry->syscall.p1, + entry->syscall.p2, + entry->syscall.p3); + break; + case TRACE_SYSRET: + seq_print_ip_sym(s, entry->sysret.ip, sym_flags); + trace_seq_printf(s, "< (%ld)\n", + entry->sysret.ret); + break; default: trace_seq_printf(s, "Unknown type %d\n", entry->type); } Index: linux-2.6.26/kernel/trace/trace.h =================================================================== --- linux-2.6.26.orig/kernel/trace/trace.h +++ linux-2.6.26/kernel/trace/trace.h @@ -21,6 +21,8 @@ enum trace_type { TRACE_TIMESTAMP, TRACE_TASK_ACT, TRACE_TASK_DEACT, + TRACE_SYSCALL, + TRACE_SYSRET, __TRACE_LAST_TYPE }; @@ -93,6 +95,19 @@ struct wakeup_entry { unsigned curr_prio; }; +struct syscall_entry { + unsigned long ip; + unsigned long nr; + unsigned long p1; + unsigned long p2; + unsigned long p3; +}; + +struct sysret_entry { + unsigned long ip; + unsigned long ret; +}; + /* * Stack-trace entry: */ @@ -127,6 +142,8 @@ struct trace_entry { struct timestamp_entry timestamp; struct task_entry task; struct wakeup_entry wakeup; + struct syscall_entry syscall; + struct sysret_entry sysret; }; }; @@ -313,6 +330,19 @@ void tracing_event_wakeup(struct trace_a unsigned long ip, pid_t pid, int prio, int curr_prio); +void tracing_event_syscall(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + unsigned long nr, + unsigned long p1, + unsigned long p2, + unsigned long p3); +void tracing_event_sysret(struct trace_array *tr, + struct trace_array_cpu *data, + unsigned long flags, + unsigned long ip, + unsigned long ret); void tracing_start_cmdline_record(void); void tracing_stop_cmdline_record(void); Index: linux-2.6.26/kernel/trace/trace_events.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace_events.c +++ linux-2.6.26/kernel/trace/trace_events.c @@ -34,6 +34,98 @@ static void event_reset(struct trace_arr tr->time_start = ftrace_now(raw_smp_processor_id()); } +/* HACK */ +void notrace +sys_call(unsigned long nr, unsigned long p1, unsigned long p2, unsigned long p3) +{ + struct trace_array *tr; + struct trace_array_cpu *data; + unsigned long flags; + unsigned long ip; + int cpu; + + if (!tracer_enabled) + return; + + tr = events_trace; + local_irq_save(flags); + cpu = raw_smp_processor_id(); + data = tr->data[cpu]; + + atomic_inc(&data->disabled); + if (atomic_read(&data->disabled) != 1) + goto out; + + ip = CALLER_ADDR0; + + tracing_event_syscall(tr, data, flags, ip, nr, p1, p2, p3); + + out: + atomic_dec(&data->disabled); + local_irq_restore(flags); +} + +#if defined(CONFIG_COMPAT) && defined(CONFIG_X86) +void notrace +sys_ia32_call(unsigned long nr, unsigned long p1, unsigned long p2, + unsigned long p3) +{ + struct trace_array *tr; + struct trace_array_cpu *data; + unsigned long flags; + unsigned long ip; + int cpu; + + if (!tracer_enabled) + return; + + tr = events_trace; + local_irq_save(flags); + cpu = raw_smp_processor_id(); + data = tr->data[cpu]; + + atomic_inc(&data->disabled); + if (atomic_read(&data->disabled) != 1) + goto out; + + ip = CALLER_ADDR0; + tracing_event_syscall(tr, data, flags, ip, nr | 0x80000000, p1, p2, p3); + + out: + atomic_dec(&data->disabled); + local_irq_restore(flags); +} +#endif + +void notrace +sys_ret(unsigned long ret) +{ + struct trace_array *tr; + struct trace_array_cpu *data; + unsigned long flags; + unsigned long ip; + int cpu; + + if (!tracer_enabled) + return; + + tr = events_trace; + local_irq_save(flags); + cpu = raw_smp_processor_id(); + data = tr->data[cpu]; + + atomic_inc(&data->disabled); + if (atomic_read(&data->disabled) != 1) + goto out; + + ip = CALLER_ADDR0; + tracing_event_sysret(tr, data, flags, ip, ret); + + out: + atomic_dec(&data->disabled); + local_irq_restore(flags); +} + #define getarg(arg, ap) arg = va_arg(ap, typeof(arg)); static void Index: linux-2.6.26/kernel/trace/trace_selftest.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace_selftest.c +++ linux-2.6.26/kernel/trace/trace_selftest.c @@ -18,6 +18,8 @@ static inline int trace_valid_entry(stru case TRACE_TIMESTAMP: case TRACE_TASK_ACT: case TRACE_TASK_DEACT: + case TRACE_SYSCALL: + case TRACE_SYSRET: return 1; } return 0; patches/preempt-trace.patch0000664000076400007640000001517611043564057015045 0ustar tglxtglxTrack preempt disable nesting This code was largly influenced by work from Ingo Molnar. Signed-off-by: Steven Rostedt --- arch/arm/kernel/traps.c | 1 + arch/x86/kernel/traps_32.c | 1 + arch/x86/kernel/traps_64.c | 1 + include/linux/preempt.h | 3 ++- include/linux/sched.h | 13 +++++++++++++ kernel/sched.c | 17 +++++++++++++++-- kernel/trace/Kconfig | 8 ++++++++ kernel/trace/Makefile | 2 ++ kernel/trace/preempt-trace.c | 30 ++++++++++++++++++++++++++++++ 9 files changed, 73 insertions(+), 3 deletions(-) Index: linux-2.6.26/arch/arm/kernel/traps.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/traps.c +++ linux-2.6.26/arch/arm/kernel/traps.c @@ -357,6 +357,7 @@ asmlinkage void do_unexp_fiq (struct pt_ { printk("Hmm. Unexpected FIQ received, but trying to continue\n"); printk("You may have a hardware problem...\n"); + print_preempt_trace(current); } /* Index: linux-2.6.26/arch/x86/kernel/traps_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/traps_32.c +++ linux-2.6.26/arch/x86/kernel/traps_32.c @@ -261,6 +261,7 @@ show_trace_log_lvl(struct task_struct *t { dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl); printk("%s =======================\n", log_lvl); + print_preempt_trace(task); } void show_trace(struct task_struct *task, struct pt_regs *regs, Index: linux-2.6.26/arch/x86/kernel/traps_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/traps_64.c +++ linux-2.6.26/arch/x86/kernel/traps_64.c @@ -389,6 +389,7 @@ show_trace(struct task_struct *tsk, stru printk("\nCall Trace:\n"); dump_trace(tsk, regs, stack, bp, &print_trace_ops, NULL); printk("\n"); + print_preempt_trace(tsk); } static void Index: linux-2.6.26/include/linux/preempt.h =================================================================== --- linux-2.6.26.orig/include/linux/preempt.h +++ linux-2.6.26/include/linux/preempt.h @@ -10,7 +10,8 @@ #include #include -#if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER) +#if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER) || \ + defined(CONFIG_PREEMPT_TRACE) extern void add_preempt_count(int val); extern void sub_preempt_count(int val); #else Index: linux-2.6.26/include/linux/sched.h =================================================================== --- linux-2.6.26.orig/include/linux/sched.h +++ linux-2.6.26/include/linux/sched.h @@ -1261,6 +1261,13 @@ struct task_struct { unsigned int lockdep_recursion; #endif +#define MAX_PREEMPT_TRACE 25 + +#ifdef CONFIG_PREEMPT_TRACE + unsigned long preempt_trace_eip[MAX_PREEMPT_TRACE]; + unsigned long preempt_trace_parent_eip[MAX_PREEMPT_TRACE]; +#endif + /* journalling filesystem info */ void *journal_info; @@ -2241,6 +2248,12 @@ static inline void inc_syscw(struct task } #endif +#ifdef CONFIG_PREEMPT_TRACE +void print_preempt_trace(struct task_struct *tsk); +#else +# define print_preempt_trace(tsk) do { } while (0) +#endif + #ifdef CONFIG_SMP void migration_init(void); #else Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -4064,7 +4064,8 @@ void scheduler_tick(void) } #if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \ - defined(CONFIG_PREEMPT_TRACER)) + defined(CONFIG_PREEMPT_TRACER) || \ + defined(CONFIG_PREEMPT_TRACE)) static inline unsigned long get_parent_ip(unsigned long addr) { @@ -4078,6 +4079,9 @@ static inline unsigned long get_parent_i void __kprobes add_preempt_count(int val) { + unsigned long eip = CALLER_ADDR0; + unsigned long parent_eip = get_parent_ip(CALLER_ADDR1); + #ifdef CONFIG_DEBUG_PREEMPT /* * Underflow? @@ -4086,6 +4090,15 @@ void __kprobes add_preempt_count(int val return; #endif preempt_count() += val; +#ifdef CONFIG_PREEMPT_TRACE + if (val <= 10) { + unsigned int idx = preempt_count() & PREEMPT_MASK; + if (idx < MAX_PREEMPT_TRACE) { + current->preempt_trace_eip[idx] = eip; + current->preempt_trace_parent_eip[idx] = parent_eip; + } + } +#endif #ifdef CONFIG_DEBUG_PREEMPT /* * Spinlock count overflowing soon? @@ -4094,7 +4107,7 @@ void __kprobes add_preempt_count(int val PREEMPT_MASK - 10); #endif if (preempt_count() == val) - trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1)); + trace_preempt_off(eip, parent_eip); } EXPORT_SYMBOL(add_preempt_count); Index: linux-2.6.26/kernel/trace/Kconfig =================================================================== --- linux-2.6.26.orig/kernel/trace/Kconfig +++ linux-2.6.26/kernel/trace/Kconfig @@ -155,3 +155,11 @@ config WAKEUP_LATENCY_HIST help This option uses the infrastructure of the wakeup tracer to create a histogram of latencies. + +config PREEMPT_TRACE + bool "Keep a record of preempt disabled spots" + depends on DEBUG_KERNEL + depends on PREEMPT + select TRACING + help + Keeps a record of the last 25 preempt disabled locations. Index: linux-2.6.26/kernel/trace/Makefile =================================================================== --- linux-2.6.26.orig/kernel/trace/Makefile +++ linux-2.6.26/kernel/trace/Makefile @@ -24,4 +24,6 @@ obj-$(CONFIG_INTERRUPT_OFF_HIST) += trac obj-$(CONFIG_PREEMPT_OFF_HIST) += trace_hist.o obj-$(CONFIG_WAKEUP_LATENCY_HIST) += trace_hist.o +obj-$(CONFIG_PREEMPT_TRACE) += preempt-trace.o + libftrace-y := ftrace.o Index: linux-2.6.26/kernel/trace/preempt-trace.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/trace/preempt-trace.c @@ -0,0 +1,30 @@ +#include +#include +#include + +void print_preempt_trace(struct task_struct *task) +{ + unsigned int count; + unsigned int i, lim; + + if (!task) + task = current; + + count = task_thread_info(task)->preempt_count; + lim = count & PREEMPT_MASK; + + if (lim >= MAX_PREEMPT_TRACE) + lim = MAX_PREEMPT_TRACE-1; + printk("---------------------------\n"); + printk("| preempt count: %08x ]\n", count); + printk("| %d-level deep critical section nesting:\n", lim); + printk("----------------------------------------\n"); + for (i = 1; i <= lim; i++) { + printk(".. [<%08lx>] .... ", task->preempt_trace_eip[i]); + print_symbol("%s\n", task->preempt_trace_eip[i]); + printk(".....[<%08lx>] .. ( <= ", + task->preempt_trace_parent_eip[i]); + print_symbol("%s)\n", task->preempt_trace_parent_eip[i]); + } + printk("\n"); +} patches/ftrace-hotplug-fix.patch0000664000076400007640000001026311043564056015774 0ustar tglxtglxFrom: Steven Rostedt Subject: ftrace: cpu hotplug fix Peter Zijlstra found that taking down and bringing up a new CPU caused ftrace to crash the kernel. This was due to some arch calls that were being traced by the function tracer before the smp_processor_id was set up. Since the function tracer uses smp_processor_id it caused a triple fault. Instead of adding notrace all over the architecture code to prevent this problem, it is easier to simply disable the function tracer when bringing up a new CPU. Signed-off-by: Steven Rostedt --- include/linux/ftrace.h | 11 ++++++++--- kernel/cpu.c | 9 +++++++++ kernel/trace/ftrace.c | 23 +++++++++++++++++++++++ kernel/trace/trace_irqsoff.c | 3 +++ kernel/trace/trace_sched_wakeup.c | 2 +- 5 files changed, 44 insertions(+), 4 deletions(-) Index: linux-2.6.26/include/linux/ftrace.h =================================================================== --- linux-2.6.26.orig/include/linux/ftrace.h +++ linux-2.6.26/include/linux/ftrace.h @@ -33,10 +33,15 @@ void clear_ftrace_function(void); extern void ftrace_stub(unsigned long a0, unsigned long a1); +void ftrace_enable(void); +void ftrace_disable(void); + #else /* !CONFIG_FTRACE */ -# define register_ftrace_function(ops) do { } while (0) -# define unregister_ftrace_function(ops) do { } while (0) -# define clear_ftrace_function(ops) do { } while (0) +# define register_ftrace_function(ops) do { } while (0) +# define unregister_ftrace_function(ops) do { } while (0) +# define clear_ftrace_function(ops) do { } while (0) +# define ftrace_enable() do { } while (0) +# define ftrace_disable() do { } while (0) #endif /* CONFIG_FTRACE */ #ifdef CONFIG_DYNAMIC_FTRACE Index: linux-2.6.26/kernel/cpu.c =================================================================== --- linux-2.6.26.orig/kernel/cpu.c +++ linux-2.6.26/kernel/cpu.c @@ -14,6 +14,7 @@ #include #include #include +#include /* Serializes the updates to cpu_online_map, cpu_present_map */ static DEFINE_MUTEX(cpu_add_remove_lock); @@ -300,8 +301,16 @@ static int __cpuinit _cpu_up(unsigned in goto out_notify; } + /* + * Disable function tracing while bringing up a new CPU. + * We don't want to trace functions that can not handle a + * smp_processor_id() call. + */ + ftrace_disable(); + /* Arch-specific enabling code. */ ret = __cpu_up(cpu); + ftrace_enable(); if (ret != 0) goto out_notify; BUG_ON(!cpu_online(cpu)); Index: linux-2.6.26/kernel/trace/ftrace.c =================================================================== --- linux-2.6.26.orig/kernel/trace/ftrace.c +++ linux-2.6.26/kernel/trace/ftrace.c @@ -151,6 +151,29 @@ static int __unregister_ftrace_function( return ret; } +static int save_ftrace_enabled; + +void ftrace_disable(void) +{ + mutex_lock(&ftrace_sysctl_lock); + + save_ftrace_enabled = ftrace_enabled; + ftrace_enabled = 0; +} + +void ftrace_enable(void) +{ + /* ftrace_enable must be paired with ftrace_disable */ + if (!mutex_is_locked(&ftrace_sysctl_lock)) { + WARN_ON(1); + return; + } + + ftrace_enabled = save_ftrace_enabled; + + mutex_unlock(&ftrace_sysctl_lock); +} + #ifdef CONFIG_DYNAMIC_FTRACE static struct task_struct *ftraced_task; Index: linux-2.6.26/kernel/trace/trace_irqsoff.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace_irqsoff.c +++ linux-2.6.26/kernel/trace/trace_irqsoff.c @@ -77,6 +77,9 @@ irqsoff_tracer_call(unsigned long ip, un long disabled; int cpu; + if (unlikely(!ftrace_enabled)) + return; + /* * Does not matter if we preempt. We test the flags * afterward, to see if irqs are disabled or not. Index: linux-2.6.26/kernel/trace/trace_sched_wakeup.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace_sched_wakeup.c +++ linux-2.6.26/kernel/trace/trace_sched_wakeup.c @@ -44,7 +44,7 @@ wakeup_tracer_call(unsigned long ip, uns int resched; int cpu; - if (likely(!wakeup_task)) + if (likely(!wakeup_task) || !ftrace_enabled) return; resched = need_resched(); patches/ftrace-stop-trace-on-crash.patch0000664000076400007640000001124011043564056017313 0ustar tglxtglxSubject: fix-tracer-wreckage-wtf-is-this-code-all-features.patch From: Thomas Gleixner Date: Thu, 19 Jun 2008 19:24:14 +0200 Signed-off-by: Thomas Gleixner --- arch/x86/kernel/traps_32.c | 2 ++ arch/x86/kernel/traps_64.c | 3 +++ include/linux/ftrace.h | 11 ++++++++--- kernel/trace/ftrace.c | 17 +++++++++++++++++ kernel/trace/trace.c | 31 +++++++++++++++++++++++++++++++ 5 files changed, 61 insertions(+), 3 deletions(-) Index: linux-2.6.26/arch/x86/kernel/traps_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/traps_32.c +++ linux-2.6.26/arch/x86/kernel/traps_32.c @@ -393,6 +393,8 @@ int __kprobes __die(const char *str, str unsigned short ss; unsigned long sp; + ftrace_stop(); + printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter); #ifdef CONFIG_PREEMPT printk("PREEMPT "); Index: linux-2.6.26/arch/x86/kernel/traps_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/traps_64.c +++ linux-2.6.26/arch/x86/kernel/traps_64.c @@ -566,6 +566,9 @@ void __kprobes oops_end(unsigned long fl int __kprobes __die(const char * str, struct pt_regs * regs, long err) { static int die_counter; + + ftrace_stop(); + printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter); #ifdef CONFIG_PREEMPT printk("PREEMPT "); Index: linux-2.6.26/include/linux/ftrace.h =================================================================== --- linux-2.6.26.orig/include/linux/ftrace.h +++ linux-2.6.26/include/linux/ftrace.h @@ -36,12 +36,18 @@ extern void ftrace_stub(unsigned long a0 void ftrace_enable(void); void ftrace_disable(void); +/* totally disable ftrace - can not re-enable after this */ +void ftrace_kill(void); +void __ftrace_kill(void); + #else /* !CONFIG_FTRACE */ # define register_ftrace_function(ops) do { } while (0) # define unregister_ftrace_function(ops) do { } while (0) # define clear_ftrace_function(ops) do { } while (0) # define ftrace_enable() do { } while (0) # define ftrace_disable() do { } while (0) +# define ftrace_kill() do { } while (0) +# define __ftrace_kill() do { } while (0) #endif /* CONFIG_FTRACE */ #ifdef CONFIG_DYNAMIC_FTRACE @@ -93,9 +99,6 @@ void ftrace_enable_daemon(void); # define ftrace_enable_daemon() do { } while (0) #endif /* CONFIG_DYNAMIC_FTRACE */ -/* totally disable ftrace - can not re-enable after this */ -void ftrace_kill(void); - static inline void tracer_disable(void) { #ifdef CONFIG_FTRACE @@ -141,9 +144,11 @@ static inline void tracer_disable(void) #ifdef CONFIG_TRACING extern void ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3); +void ftrace_stop(void); #else static inline void ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } +static inline void ftrace_stop(void) { } #endif #ifdef CONFIG_EVENT_TRACER Index: linux-2.6.26/kernel/trace/ftrace.c =================================================================== --- linux-2.6.26.orig/kernel/trace/ftrace.c +++ linux-2.6.26/kernel/trace/ftrace.c @@ -1639,6 +1639,23 @@ void ftrace_kill(void) } /** + * __ftrace_kill - shutdown ftrace in a mean fashion + * + * In case of system failure we want to stop ftrace as soon as + * possible. This is like ftrace_kill but does not grab the + * mutexes nor does it call the kstop machine. + * + * This one is save to use in atomic. + */ +void __ftrace_kill(void) +{ + ftrace_disabled = 1; + ftrace_enabled = 0; + + clear_ftrace_function(); +} + +/** * register_ftrace_function - register a function for profiling * @ops - ops structure that holds the function for profiling. * Index: linux-2.6.26/kernel/trace/trace.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace.c +++ linux-2.6.26/kernel/trace/trace.c @@ -3211,6 +3211,37 @@ static __init void tracer_init_debugfs(v #endif } +/** + * ftrace_stop - called when we need to drastically disable the tracer. + */ +void ftrace_stop(void) +{ + struct tracer *saved_tracer = current_trace; + struct trace_array *tr = &global_trace; + struct trace_array_cpu *data; + int i; + + __ftrace_kill(); + for_each_tracing_cpu(i) { + data = tr->data[i]; + atomic_inc(&data->disabled); + } + tracer_enabled = 0; + + /* + * TODO: make a safe method to ctrl_update. + * ctrl_update may schedule, but currently only + * does when ftrace is enabled. + */ + if (tr->ctrl) { + tr->ctrl = 0; + if (saved_tracer && saved_tracer->ctrl_update) + saved_tracer->ctrl_update(tr); + } + + +} + static int trace_alloc_page(void) { struct trace_array_cpu *data; patches/ftrace-document-update1.patch0000664000076400007640000004047411043564056016714 0ustar tglxtglxFrom: Steven Rostedt Subject: ftrace: document updates The following updates were recommended by Elias Oltmanns and Randy Dunlap. Signed-off-by: Steven Rostedt --- Documentation/ftrace.txt | 134 ++++++++++++++++++++++++----------------------- 1 file changed, 71 insertions(+), 63 deletions(-) Index: linux-2.6.26/Documentation/ftrace.txt =================================================================== --- linux-2.6.26.orig/Documentation/ftrace.txt +++ linux-2.6.26/Documentation/ftrace.txt @@ -2,8 +2,11 @@ ======================== Copyright 2008 Red Hat Inc. -Author: Steven Rostedt + Author: Steven Rostedt + License: The GNU Free Documentation License, Version 1.2 +Reviewers: Elias Oltmanns and Randy Dunlap +Writen for: 2.6.26-rc8 linux-2.6-tip.git tip/tracing/ftrace branch Introduction ------------ @@ -46,7 +49,7 @@ of ftrace. Here is a list of some of the that is configured. available_tracers : This holds the different types of tracers that - has been compiled into the kernel. The tracers + have been compiled into the kernel. The tracers listed here can be configured by echoing in their name into current_tracer. @@ -90,11 +93,13 @@ of ftrace. Here is a list of some of the trace_entries : This sets or displays the number of trace entries each CPU buffer can hold. The tracer buffers are the same size for each CPU, so care must be - taken when modifying the trace_entries. The number - of actually entries will be the number given - times the number of possible CPUS. The buffers - are saved as individual pages, and the actual entries - will always be rounded up to entries per page. + taken when modifying the trace_entries. The trace + buffers are allocated in pages (blocks of memory that + the kernel uses for allocation, usually 4 KB in size). + Since each entry is smaller than a page, if the last + allocated page has room for more entries than were + requested, the rest of the page is used to allocate + entries. This can only be updated when the current_tracer is set to "none". @@ -114,13 +119,13 @@ of ftrace. Here is a list of some of the in performance. This also has a side effect of enabling or disabling specific functions to be traced. Echoing in names of functions into this - file will limit the trace to only those files. + file will limit the trace to only these functions. set_ftrace_notrace: This has the opposite effect that set_ftrace_filter has. Any function that is added here will not be traced. If a function exists - in both set_ftrace_filter and set_ftrace_notrace - the function will _not_ bet traced. + in both set_ftrace_filter and set_ftrace_notrace, + the function will _not_ be traced. available_filter_functions : When a function is encountered the first time by the dynamic tracer, it is recorded and @@ -138,7 +143,7 @@ Here are the list of current tracers tha ftrace - function tracer that uses mcount to trace all functions. It is possible to filter out which functions that are - traced when dynamic ftrace is configured in. + to be traced when dynamic ftrace is configured in. sched_switch - traces the context switches between tasks. @@ -297,13 +302,13 @@ explains which is which. The above is mostly meaningful for kernel developers. - time: This differs from the trace output where as the trace output - contained a absolute timestamp. This timestamp is relative - to the start of the first entry in the the trace. + time: This differs from the trace file output. The trace file output + included an absolute timestamp. The timestamp used by the + latency_trace file is relative to the start of the trace. delay: This is just to help catch your eye a bit better. And needs to be fixed to be only relative to the same CPU. - The marks is determined by the difference between this + The marks are determined by the difference between this current trace and the next trace. '!' - greater than preempt_mark_thresh (default 100) '+' - greater than 1 microsecond @@ -322,13 +327,13 @@ output. To see what is available, simply print-parent nosym-offset nosym-addr noverbose noraw nohex nobin \ noblock nostacktrace nosched-tree -To disable one of the options, echo in the option appended with "no". +To disable one of the options, echo in the option prepended with "no". echo noprint-parent > /debug/tracing/iter_ctrl To enable an option, leave off the "no". - echo sym-offest > /debug/tracing/iter_ctrl + echo sym-offset > /debug/tracing/iter_ctrl Here are the available options: @@ -344,7 +349,7 @@ Here are the available options: sym-offset - Display not only the function name, but also the offset in the function. For example, instead of seeing just - "ktime_get" you will see "ktime_get+0xb/0x20" + "ktime_get", you will see "ktime_get+0xb/0x20". sym-offset: bash-4000 [01] 1477.606694: simple_strtoul+0x6/0xa0 @@ -364,7 +369,7 @@ Here are the available options: user applications that can translate the raw numbers better than having it done in the kernel. - hex - similar to raw, but the numbers will be in a hexadecimal format. + hex - Similar to raw, but the numbers will be in a hexadecimal format. bin - This will print out the formats in raw binary. @@ -381,7 +386,7 @@ sched_switch ------------ This tracer simply records schedule switches. Here's an example -on how to implement it. +of how to use it. # echo sched_switch > /debug/tracing/current_tracer # echo 1 > /debug/tracing/tracing_enabled @@ -470,7 +475,7 @@ interrupt from triggering or the mouse i kernel know of a new mouse event. The result is a latency with the reaction time. -The irqsoff tracer tracks the time interrupts are disabled and when +The irqsoff tracer tracks the time interrupts are disabled to the time they are re-enabled. When a new maximum latency is hit, it saves off the trace so that it may be retrieved at a later time. Every time a new maximum in reached, the old saved trace is discarded and the new @@ -519,7 +524,7 @@ The difference between the 6 and the dis because the clock must have incremented between the time of recording the max latency and recording the function that had that latency. -Note the above had ftrace_enabled not set. If we set the ftrace_enabled +Note the above had ftrace_enabled not set. If we set the ftrace_enabled, we get a much larger output: # tracer: irqsoff @@ -570,21 +575,21 @@ vim:ft=help Here we traced a 50 microsecond latency. But we also see all the -functions that were called during that time. Note that enabling -function tracing we endure an added overhead. This overhead may -extend the latency times. But never the less, this trace has provided -some very helpful debugging. +functions that were called during that time. Note that by enabling +function tracing, we endure an added overhead. This overhead may +extend the latency times. But nevertheless, this trace has provided +some very helpful debugging information. preemptoff ---------- -When preemption is disabled we may be able to receive interrupts but -the task can not be preempted and a higher priority task must wait +When preemption is disabled, we may be able to receive interrupts but +the task cannot be preempted and a higher priority task must wait for preemption to be enabled again before it can preempt a lower priority task. -The preemptoff tracer traces the places that disables preemption. +The preemptoff tracer traces the places that disable preemption. Like the irqsoff, it records the maximum latency that preemption was disabled. The control of preemptoff is much like the irqsoff. @@ -696,7 +701,7 @@ Notice that the __do_softirq when called It may seem that we missed a preempt enabled. What really happened is that the preempt count is held on the threads stack and we switched to the softirq stack (4K stacks in effect). The code -does not copy the preempt count, but because interrupts are disabled +does not copy the preempt count, but because interrupts are disabled, we don't need to worry about it. Having a tracer like this is good to let people know what really happens inside the kernel. @@ -732,7 +737,7 @@ To record this time, use the preemptirqs Again, using this trace is much like the irqsoff and preemptoff tracers. - # echo preemptoff > /debug/tracing/current_tracer + # echo preemptirqsoff > /debug/tracing/current_tracer # echo 0 > /debug/tracing/tracing_max_latency # echo 1 > /debug/tracing/tracing_enabled # ls -ltr @@ -862,9 +867,9 @@ This is a very interesting trace. It sta the ls task. We see that the task had the "need_resched" bit set with the 'N' in the trace. Interrupts are disabled in the spin_lock and the trace started. We see that a schedule took place to run -sshd. When the interrupts were enabled we took an interrupt. -On return of the interrupt the softirq ran. We took another interrupt -while running the softirq as we see with the capital 'H'. +sshd. When the interrupts were enabled, we took an interrupt. +On return from the interrupt handler, the softirq ran. We took another +interrupt while running the softirq as we see with the capital 'H'. wakeup @@ -876,9 +881,9 @@ time it executes. This is also known as I stress the point that this is about RT tasks. It is also important to know the scheduling latency of non-RT tasks, but the average schedule latency is better for non-RT tasks. Tools like -LatencyTop is more appropriate for such measurements. +LatencyTop are more appropriate for such measurements. -Real-Time environments is interested in the worst case latency. +Real-Time environments are interested in the worst case latency. That is the longest latency it takes for something to happen, and not the average. We can have a very fast scheduler that may only have a large latency once in a while, but that would not work well @@ -889,8 +894,8 @@ tasks that are unpredictable will overwr of RT tasks. Since this tracer only deals with RT tasks, we will run this slightly -different than we did with the previous tracers. Instead of performing -an 'ls' we will run 'sleep 1' under 'chrt' which changes the +differently than we did with the previous tracers. Instead of performing +an 'ls', we will run 'sleep 1' under 'chrt' which changes the priority of the task. # echo wakeup > /debug/tracing/current_tracer @@ -924,9 +929,9 @@ wakeup latency trace v1.1.5 on 2.6.26-rc vim:ft=help -Running this on an idle system we see that it only took 4 microseconds +Running this on an idle system, we see that it only took 4 microseconds to perform the task switch. Note, since the trace marker in the -schedule is before the actual "switch" we stop the tracing when +schedule is before the actual "switch", we stop the tracing when the recorded task is about to schedule in. This may change if we add a new marker at the end of the scheduler. @@ -992,12 +997,15 @@ ksoftirq-7 1d..4 50us : schedule ( The interrupt went off while running ksoftirqd. This task runs at SCHED_OTHER. Why didn't we see the 'N' set early? This may be -a harmless bug with x86_32 and 4K stacks. The need_reched() function -that tests if we need to reschedule looks on the actual stack. -Where as the setting of the NEED_RESCHED bit happens on the -task's stack. But because we are in a hard interrupt, the test -is with the interrupts stack which has that to be false. We don't -see the 'N' until we switch back to the task's stack. +a harmless bug with x86_32 and 4K stacks. On x86_32 with 4K stacks +configured, the interrupt and softirq runs with their own stack. +Some information is held on the top of the task's stack (need_resched +and preempt_count are both stored there). The setting of the NEED_RESCHED +bit is done directly to the task's stack, but the reading of the +NEED_RESCHED is done by looking at the current stack, which in this case +is the stack for the hard interrupt. This hides the fact that NEED_RESCHED +has been set. We don't see the 'N' until we switch back to the task's +assigned stack. ftrace ------ @@ -1067,10 +1075,10 @@ this works is the mcount function call ( every kernel function, produced by the -pg switch in gcc), starts of pointing to a simple return. -When dynamic ftrace is initialized, it calls kstop_machine to make it -act like a uniprocessor so that it can freely modify code without -worrying about other processors executing that same code. At -initialization, the mcount calls are change to call a "record_ip" +When dynamic ftrace is initialized, it calls kstop_machine to make +the machine act like a uniprocessor so that it can freely modify code +without worrying about other processors executing that same code. At +initialization, the mcount calls are changed to call a "record_ip" function. After this, the first time a kernel function is called, it has the calling address saved in a hash table. @@ -1085,8 +1093,8 @@ traced, is that we can now selectively c want to trace and which ones we want the mcount calls to remain as nops. -Two files that contain to the enabling and disabling of recorded -functions are: +Two files are used, one for enabling and one for disabling the tracing +of recorded functions. They are: set_ftrace_filter @@ -1094,7 +1102,7 @@ and set_ftrace_notrace -A list of available functions that you can add to this files is listed +A list of available functions that you can add to these files is listed in: available_filter_functions @@ -1133,9 +1141,9 @@ sys_nanosleep Perhaps this isn't enough. The filters also allow simple wild cards. -Only the following is currently available +Only the following are currently available - * - will match functions that begins with + * - will match functions that begin with * - will match functions that end with ** - will match functions that have in it @@ -1187,7 +1195,7 @@ This is because the '>' and '>>' act jus To rewrite the filters, use '>' To append to the filters, use '>>' -To clear out a filter so that all functions will be recorded again. +To clear out a filter so that all functions will be recorded again: # echo > /debug/tracing/set_ftrace_filter # cat /debug/tracing/set_ftrace_filter @@ -1246,8 +1254,8 @@ ftraced As mentioned above, when dynamic ftrace is configured in, a kernel thread wakes up once a second and checks to see if there are mcount -calls that need to be converted into nops. If there is not, then -it simply goes back to sleep. But if there is, it will call +calls that need to be converted into nops. If there are not any, then +it simply goes back to sleep. But if there are some, it will call kstop_machine to convert the calls to nops. There may be a case that you do not want this added latency. @@ -1262,8 +1270,8 @@ mcount calls to nops. Remember that ther to calling mcount. Without this kernel thread, that overhead will exist. -Any write to the ftraced_enabled file will cause the kstop_machine -to run if there are recorded calls to mcount. This means that a +If there are recorded calls to mcount, any write to the ftraced_enabled +file will cause the kstop_machine to run. This means that a user can manually perform the updates when they want to by simply echoing a '0' into the ftraced_enabled file. @@ -1315,7 +1323,7 @@ trace entries Having too much or not enough data can be troublesome in diagnosing some issue in the kernel. The file trace_entries is used to modify -the size of the internal trace buffers. The numbers listed +the size of the internal trace buffers. The number listed is the number of entries that can be recorded per CPU. To know the full size, multiply the number of possible CPUS with the number of entries. @@ -1323,7 +1331,7 @@ number of entries. # cat /debug/tracing/trace_entries 65620 -Note, to modify this you must have tracing fulling disabled. To do that, +Note, to modify this, you must have tracing completely disabled. To do that, echo "none" into the current_tracer. # echo none > /debug/tracing/current_tracer @@ -1344,7 +1352,7 @@ it will add them. This shows us that 85 entries can fit on a single page. The number of pages that will be allocated is a percentage of available -memory. Allocating too much will produces an error. +memory. Allocating too much will produce an error. # echo 1000000000000 > /debug/tracing/trace_entries -bash: echo: write error: Cannot allocate memory patches/ftrace-document-event-tracer.patch0000664000076400007640000003045711043564056017750 0ustar tglxtglx--- Documentation/ftrace.txt | 260 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 260 insertions(+) Index: linux-2.6.26/Documentation/ftrace.txt =================================================================== --- linux-2.6.26.orig/Documentation/ftrace.txt +++ linux-2.6.26/Documentation/ftrace.txt @@ -7,6 +7,7 @@ Copyright 2008 Red Hat Inc. Reviewers: Elias Oltmanns and Randy Dunlap Writen for: 2.6.26-rc8 linux-2.6-tip.git tip/tracing/ftrace branch + (RT patch edition) Introduction ------------ @@ -164,6 +165,8 @@ Here are the list of current tracers tha the highest priority task to get scheduled after it has been woken up. + events - Traces various kernel events (interrupts, timers, system calls). + none - This is not a tracer. To remove all tracers from tracing simply echo "none" into current_tracer. @@ -1007,6 +1010,263 @@ is the stack for the hard interrupt. Thi has been set. We don't see the 'N' until we switch back to the task's assigned stack. + +events +------ + +The events tracer records various events that happen in the kernel. +Having this with function tracer produces more useful information +than just having ftrace alone. But ftrace can be overflowing with +information, and running events tracer without ftrace may be helpful +enough. + + # sysctl kernel.ftrace_enabled=0 + # echo events > /debug/tracing/current_tracer + # echo 1 > /debug/tracing/tracing_enabled + # usleep 1 + # echo 0 > /debug/tracing/tracing_enabled + # cat /debug/tracing/trace + +[ I trimmed this output to just show the various traces ] + +# tracer: events +# +# TASK-PID CPU# TIMESTAMP FUNCTION +# | | | | | + bash-3270 [00] 326.468161: syscall_exit< (7) + bash-3270 [00] 326.468164: sysenter_enter sys_dup2 (a 1 1) + bash-3270 [00] 326.468166: syscall_exit< (1) + bash-3270 [00] 326.468167: sysenter_enter sys_fcntl64 (a 1 1) + bash-3270 [00] 326.468168: syscall_exit< (1) + bash-3270 [00] 326.468169: sysenter_enter sys_close (a 1 1) + bash-3270 [00] 326.468170: syscall_exit< (0) + bash-3270 [00] 326.468175: sysenter_enter sys_rt_sigprocmask (0 0 0) + bash-3270 [00] 326.468175: syscall_exit< (0) +[...] + bash-3270 [00] 326.468302: sysenter_enter sys_write (1 b7fbb000 b7f1d000) + bash-3270 [00] 326.468306: activate_task sshd 3268 120 [1] + bash-3270 [00] 326.468307: 0:140:R + 3268:120:S + bash-3270 [00] 326.468309: syscall_exit< (19) + -0 [01] 326.468309: 0:140:R ==> 3268:120:R + sshd-3268 [01] 326.468315: syscall_exit< (1) + sshd-3268 [01] 326.468316: sysenter_enter sys_rt_sigprocmask (0 bf9d95b8 bfa93678) + sshd-3268 [01] 326.468317: syscall_exit< (0) + sshd-3268 [01] 326.468318: sysenter_enter sys_rt_sigprocmask (2 bf9d9638 bfa936f8) + sshd-3268 [01] 326.468318: syscall_exit< (0) + sshd-3268 [01] 326.468319: sysenter_enter sys_read (b bf9d563c bfa8f6fc) + sshd-3268 [01] 326.468323: syscall_exit< (19) + bash-3270 [00] 326.468330: sysenter_enter sys_write (3 b7fbb000 b7f1d000) + bash-3270 [00] 326.468333: syscall_exit< (1) + sshd-3268 [01] 326.468336: sysenter_enter sys_select (d8 80074528 80073e88) + sshd-3268 [01] 326.468340: syscall_exit< (2) + +[...] + + bash-3270 [01] 328.471447: smp_apic_timer_interrupt -1 (usermode) + bash-3270 [01] 328.471447: hrtimer_interrupt (286035251144) + bash-3270 [01] 328.471448: hrtimer_interrupt (286035250000) (cabd93a4) + +[...] + + bash-3270 [01] 330.337906: sysenter_enter sys_pipe (80f29cc 0 0) + bash-3270 [01] 330.337910: syscall_exit< (0) + bash-3270 [01] 330.337911: sysenter_enter sys_clone (1200011 0 0) + bash-3270 [01] 330.337931: smp_apic_timer_interrupt -1 (rt_spin_unlock) + bash-3270 [01] 330.337932: hrtimer_interrupt (287904251119) + bash-3270 [01] 330.337933: hrtimer_interrupt (287904250000) (cabd93a4) + bash-3270 [01] 330.337936: activate_task sirq-timer/1 19 49 [1] + -0 [00] 330.337937: clockevents_program_event (288552039947) (647784092) + -0 [00] 330.337937: enqueue_hrtimer (287905000000) (cabd03a4) + bash-3270 [01] 330.337937: 3270:120:R + 19: 49:S + -0 [00] 330.337938: clockevents_program_event (287905000000) (742994) + bash-3270 [01] 330.337940: activate_task sirq-rcu/1 26 49 [1] + bash-3270 [01] 330.337941: 3270:120:R + 26: 49:S + bash-3270 [01] 330.337942: enqueue_hrtimer (287905250000) (cabd93a4) + bash-3270 [01] 330.337942: clockevents_program_event (287905250000) (988495) + bash-3270 [01] 330.337945: 3270:120:R ==> 19: 49:R + sirq-timer/1-19 [01] 330.337947: activate_task kondemand/1 2302 115 [1] + sirq-timer/1-19 [01] 330.337948: 19: 49:R + 2302:115:S + sirq-timer/1-19 [01] 330.337952: deactivate_task sirq-timer/1 19 49 [1] + sirq-timer/1-19 [01] 330.337953: 19: 49:S ==> 26: 49:R + sirq-rcu/1-26 [01] 330.337955: deactivate_task sirq-rcu/1 26 49 [1] + sirq-rcu/1-26 [01] 330.337956: 26: 49:S ==> 2302:115:R + kondemand/1-2302 [01] 330.337959: deactivate_task kondemand/1 2302 115 [1] + kondemand/1-2302 [01] 330.337960: 2302:115:S ==> 3270:120:R + bash-3270 [01] 330.338007: 3270:120:R + 3302:120:R + bash-3270 [01] 330.338009: 3270:120:R ==> 3302:120:R + usleep-3302 [01] 330.338011: do_page_fault 3 (__put_user_4) [b7fb3708] + usleep-3302 [01] 330.338019: syscall_exit< (-167586576) + usleep-3302 [01] 330.338020: do_page_fault 14 () [b7fc3410] + +[...] + + usleep-3302 [01] 330.338081: do_page_fault 14 () [43807c30] + usleep-3302 [01] 330.338083: sysenter_enter sys_rt_sigprocmask (2 80fb380 80fb380) + usleep-3302 [01] 330.338084: syscall_exit< (0) + usleep-3302 [01] 330.338085: do_page_fault 7 () [80f8230] +[...] + + usleep-3302 [00] 330.348695: deactivate_task usleep 3302 120 [0] + usleep-3302 [00] 330.348696: 3302:120:T ==> 0:140:R + -0 [00] 330.348699: clockevents_program_event (288552039947) (637007252) + -0 [00] 330.348700: enqueue_hrtimer (288104000000) (cabd03a4) + -0 [00] 330.348700: clockevents_program_event (288104000000) (188966439) + -0 [00] 330.348851: do_IRQ 217 (mwait_idle_with_hints) + -0 [00] 330.348852: activate_task IRQ-217 476 49 [1] + -0 [00] 330.348854: 0:140:R + 476: 49:S + -0 [01] 330.348855: 0:140:R ==> 476: 49:R + -0 [00] 330.348856: clockevents_program_event (288552039947) (636850255) + -0 [00] 330.348856: enqueue_hrtimer (288104000000) (cabd03a4) + -0 [00] 330.348857: clockevents_program_event (288104000000) (188809576) + IRQ-217-476 [01] 330.348860: activate_task sirq-block/1 22 49 [1] + +[...] + + usleep-3302 [00] 330.349245: do_page_fault 14 () [43880800] + usleep-3302 [00] 330.349247: sysenter_enter sys_nanosleep (bf861910 0 0) + usleep-3302 [00] 330.349248: enqueue_hrtimer (287915583157) (f45f3f44) + usleep-3302 [00] 330.349249: clockevents_program_event (287915583157) (268) + usleep-3302 [00] 330.349250: deactivate_task usleep 3302 120 [0] + usleep-3302 [00] 330.349252: 3302:120:S ==> 0:140:R + -0 [00] 330.349253: smp_apic_timer_interrupt -1 (cpu_idle) + -0 [00] 330.349254: hrtimer_interrupt (287915587897) + -0 [00] 330.349254: hrtimer_interrupt (287915583157) (f45f3f44) + -0 [00] 330.349255: activate_task usleep 3302 120 [0] + -0 [00] 330.349256: 0:140:R + 3302:120:S + -0 [00] 330.349257: clockevents_program_event (287916000000) (408972) + -0 [00] 330.349258: 0:140:R ==> 3302:120:R + usleep-3302 [00] 330.349259: syscall_exit< (0) + usleep-3302 [00] 330.349268: sysenter_enter sys_exit_group (0 4 4) +[...] + +The "function" formats for the event entries are: + + The wake up and schedule events are the same as the sched_switch + tracer. They will not be repeated here. + + interrupt: + + (|"usermode") + + The above example contains: + + bash-3270 [01] 328.471447: smp_apic_timer_interrupt -1 (usermode) + + Here the timer interrupt went off while bash was in usermode. The + timer interrupt handler is smp_apic_timer_interrupt. The + "-1" is that the timer interrupt event handler does not pass + in an IRQ number. + + -0 [00] 330.348851: do_IRQ 217 (mwait_idle_with_hints) + + Here, the interrupt "217" triggered while the idle thread was + in kernel mode running "mwait_idle_with_hints". + + + page faults: + + () [] + + Examples: + + usleep-3302 [01] 330.338011: do_page_fault 3 (__put_user_4) [b7fb3708] + + A page fault happened in the kernel function "__put_user_4". + This is normal when the kernel tries to write to user memory + and the memory is not allocated yet. The address was at + 0xb7fb3708. + + + usleep-3302 [01] 330.338020: do_page_fault 14 () [b7fc3410] + + This example shows a much more common case. This is simply + the usleep programm faulting in stack addresses. + + + timer set: + + () () + + When a timer is queued, the expires time is recorded as well + as the pointer to the timer structure. The pointer is just + a way to see which timer has been set, and can be used to + track other updates to it. + + Example: + + usleep-3302 [00] 330.349248: enqueue_hrtimer (287915583157) (f45f3f44) + + The usleep program enqueued a timer to go off at the timestamp + 287915583157 and the pointer used is 0xf45f3f44. + + + timer triggered: + + () () + + Similar to the timer set, this is the format when the timer + is triggered. + + Example: + + -0 [00] 330.349254: hrtimer_interrupt (287915583157) (f45f3f44) + + The hrtimer_interrupt handled the timer set by our usleep + program. + + task activated: + + [] + + When a task is queued to run, the 8 character command line of + the task, the task PID, the task kernel priority (remmeber + this is the inverse of userland priority, where 0 is highest), + and the task CPU are all recorded in the trace entry. + + Example: + + -0 [00] 330.349255: activate_task usleep 3302 120 [0] + + The timer interrupt woke up the usleep task. The activate_task + is a kenel function to queue the task. + + task deactivate: + + [] + + This is the same format as the activate task. This gets called + when the task is removed from the run queue and goes to + sleep. + + Example: + + usleep-3302 [00] 330.348695: deactivate_task usleep 3302 120 [0] + + After scheduling a timer interrupt to wake itself up, the + usleep program removed itself from the run queue to sleep. + + + system call: + + ( ) + + When a system call is made, the trace records the kernel + function entry point (ususally in assembly), it looks + up the system call in the system call table for the kernel + function entry for the system call. It then records the + first three parameters of the system call (p1, p2, p3). + + Example: + + usleep-3302 [00] 330.349247: sysenter_enter sys_nanosleep (bf861910 0 0) + + The "sysenter_enter" is a label in the assembly of in the + kernel that handles system call exceptions. + + The "sys_nanosleep" is the kernel function to handle the + nanosleep system call. The bf861910 is the pointer to the + timespec passed into the system call. + ftrace ------ patches/ftrace-preempt-trace-check.patch0000664000076400007640000000235011043412763017344 0ustar tglxtglxSubject: ftrace: only trace preempt off with preempt tracer From: Steven Rostedt When PREEMPT_TRACER and IRQSOFF_TRACER are both configured and irqsoff tracer is running, the preempt_off sections might also be traced. Thanks to Andrew Morton for pointing out my mistake of spin_lock disabling interrupts while he was reviewing ftrace.txt. Seems that my example I used actually hit this bug. Signed-off-by: Steven Rostedt --- kernel/trace/trace_irqsoff.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) Index: linux-2.6.26/kernel/trace/trace_irqsoff.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace_irqsoff.c +++ linux-2.6.26/kernel/trace/trace_irqsoff.c @@ -358,13 +358,15 @@ EXPORT_SYMBOL(trace_hardirqs_off_caller) void trace_preempt_on(unsigned long a0, unsigned long a1) { tracing_hist_preempt_stop(0); - stop_critical_timing(a0, a1); + if (preempt_trace()) + stop_critical_timing(a0, a1); } void trace_preempt_off(unsigned long a0, unsigned long a1) { start_critical_timing(a0, a1); - tracing_hist_preempt_start(); + if (preempt_trace()) + tracing_hist_preempt_start(); } #endif /* CONFIG_PREEMPT_TRACER */ patches/trace-do-not-wakeup-when-irqs-disabled.patch0000664000076400007640000000201111043423513021512 0ustar tglxtglxSubject: trace-do-not-wakeup-when-irqs-disabled.patch From: Thomas Gleixner Date: Wed, 23 Jul 2008 23:52:47 +0200 When PREEMPT_RT is enabled then the wakeup code (including the tracer) can be called with interrupts disabled which triggers the might sleep check in rt_spin_lock_fastlock(). Do not call wakeup when interrupts are disabled in the PREEMPT_RT case. Signed-off-by: Thomas Gleixner --- kernel/trace/trace.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) Index: linux-2.6.26/kernel/trace/trace.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace.c +++ linux-2.6.26/kernel/trace/trace.c @@ -163,7 +163,10 @@ void trace_wake_up(void) * have for now: */ if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) - wake_up(&trace_wait); +#ifdef CONFIG_PREEMPT_RT + if (!irqs_disabled()) +#endif + wake_up(&trace_wait); } #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) patches/trace-add-event-markers-arm.patch0000664000076400007640000000137011043564055017444 0ustar tglxtglx--- arch/arm/kernel/irq.c | 4 ++++ 1 file changed, 4 insertions(+) Index: linux-2.6.26/arch/arm/kernel/irq.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/irq.c +++ linux-2.6.26/arch/arm/kernel/irq.c @@ -37,6 +37,8 @@ #include #include +#include + #include #include @@ -113,6 +115,8 @@ asmlinkage void __exception asm_do_IRQ(u struct pt_regs *old_regs = set_irq_regs(regs); struct irq_desc *desc = irq_desc + irq; + ftrace_event_irq(irq, user_mode(regs), instruction_pointer(regs)); + /* * Some hardware gives randomly wrong interrupts. Rather * than crashing, do something sensible. patches/powerpc-ftrace-stop-on-oops.patch0000664000076400007640000000161611043564055017561 0ustar tglxtglxSubject: powerpc: ftrace stop on crash From: Thomas Gleixner Date: Sun, 27 Jul 2008 09:42:36 +0200 Stop tracing, when we run into an oops/bug. That way we can see what led to that. Signed-off-by: Thomas Gleixner --- arch/powerpc/kernel/traps.c | 3 +++ 1 file changed, 3 insertions(+) Index: linux-2.6.26/arch/powerpc/kernel/traps.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/traps.c +++ linux-2.6.26/arch/powerpc/kernel/traps.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #include @@ -111,6 +112,8 @@ int die(const char *str, struct pt_regs if (debugger(regs)) return 1; + ftrace_stop(); + oops_enter(); if (die.lock_owner != raw_smp_processor_id()) { patches/ppc-gtod-notrace-fix.patch0000664000076400007640000000076011043564055016216 0ustar tglxtglx--- arch/powerpc/kernel/time.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/arch/powerpc/kernel/time.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/time.c +++ linux-2.6.26/arch/powerpc/kernel/time.c @@ -796,7 +796,7 @@ static cycle_t rtc_read(void) return (cycle_t)get_rtc(); } -static cycle_t timebase_read(void) +static cycle_t notrace timebase_read(void) { return (cycle_t)get_tb(); } patches/ppc32_notrace_init_functions.patch0000664000076400007640000000306611043564055020043 0ustar tglxtglxSubject: don't trace early init functions for ppc32 By: Luotao Fu If the latency tracer is turned on in the kernel config, _mcount calls are added automatically to every function call during compiling since -pg compiling flag is set. _mcount() checks first the variable mcount_enabled. (see implementation of _mcount() in arch/powerpc/kernel/entry_32.S) This will stuck forever if _mcount is called before mcount_enabled is initialized. Hence we mark some init functions as notrace, so that _mcount calls are not added to these functions. Signed-off-by: Luotao Fu --- arch/powerpc/kernel/cputable.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6.26/arch/powerpc/kernel/cputable.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/cputable.c +++ linux-2.6.26/arch/powerpc/kernel/cputable.c @@ -1541,7 +1541,7 @@ static struct cpu_spec __initdata cpu_sp static struct cpu_spec the_cpu_spec; -struct cpu_spec * __init identify_cpu(unsigned long offset, unsigned int pvr) +notrace struct cpu_spec * __init identify_cpu(unsigned long offset, unsigned int pvr) { struct cpu_spec *s = cpu_specs; struct cpu_spec *t = &the_cpu_spec; @@ -1588,7 +1588,7 @@ struct cpu_spec * __init identify_cpu(un return NULL; } -void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end) +notrace void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end) { struct fixup_entry { unsigned long mask; patches/ftrace-m68knommu-add-FTRACE-support.patch0000664000076400007640000000637111043704546020576 0ustar tglxtglxFrom 674ceaadcb008adc57249a54c1b5b20c74c8c80b Mon Sep 17 00:00:00 2001 From: Sebastian Siewior Date: Wed, 9 Jul 2008 13:33:20 +0200 Subject: [PATCH] m68knommu: add FTRACE support due to a gcc bug or feature or me too stupid, the following patch has to be applied to gcc: |m68k: remove label generation on -pg | |haven't found a reason why this flag is needed. Maybe glibc needs this label. |However this implementation puts the labels too far away. | |Signed-off-by: Sebastian Siewior | |--- a/gcc/config/m68k/linux.h |+++ b/gcc/config/m68k/linux.h |@@ -143,7 +143,6 @@ along with GCC; see the file COPYING3. | #undef FUNCTION_PROFILER | #define FUNCTION_PROFILER(FILE, LABELNO) \ | { \ |- asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO)); \ | if (flag_pic) \ | fprintf (FILE, "\tbsr.l _mcount@PLTPC\n"); \ | else \ |--- a/gcc/config/m68k/m68k.h |+++ b/gcc/config/m68k/m68k.h |@@ -576,7 +576,7 @@ extern enum reg_class regno_reg_class[]; | #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) 0 | | #define FUNCTION_PROFILER(FILE, LABELNO) \ |- asm_fprintf (FILE, "\tlea %LLP%d,%Ra0\n\tjsr mcount\n", (LABELNO)) |+ asm_fprintf (FILE, "\tjsr mcount\n", (LABELNO)) | | #define EXIT_IGNORE_STACK 1 | Signed-off-by: Sebastian Siewior Signed-off-by: Thomas Gleixner --- arch/m68knommu/Kconfig | 1 arch/m68knommu/kernel/process.c | 2 + arch/m68knommu/platform/coldfire/entry.S | 33 +++++++++++++++++++++++++++++++ 3 files changed, 36 insertions(+) Index: linux-2.6.26/arch/m68knommu/Kconfig =================================================================== --- linux-2.6.26.orig/arch/m68knommu/Kconfig +++ linux-2.6.26/arch/m68knommu/Kconfig @@ -179,6 +179,7 @@ config M527x config COLDFIRE bool depends on (M5206 || M5206e || M520x || M523x || M5249 || M527x || M5272 || M528x || M5307 || M532x || M5407) + select HAVE_FTRACE default y config CLOCK_SET Index: linux-2.6.26/arch/m68knommu/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/m68knommu/kernel/process.c +++ linux-2.6.26/arch/m68knommu/kernel/process.c @@ -74,7 +74,9 @@ void cpu_idle(void) { /* endless idle loop with no priority at all */ while (1) { + stop_critical_timings(); idle(); + start_critical_timings(); preempt_enable_no_resched(); schedule(); preempt_disable(); Index: linux-2.6.26/arch/m68knommu/platform/coldfire/entry.S =================================================================== --- linux-2.6.26.orig/arch/m68knommu/platform/coldfire/entry.S +++ linux-2.6.26/arch/m68knommu/platform/coldfire/entry.S @@ -55,6 +55,39 @@ sw_usp: .globl inthandler .globl fasthandler +#ifdef CONFIG_FTRACE +ENTRY(_mcount) + linkw %fp, #0 + + moveal ftrace_trace_function, %a0 + movel #ftrace_stub, %d0 + cmpl %a0@, %d0 + + bnew do_mcount + + unlk %fp + rts + +do_mcount: + + movel %fp, %d0 + moveal %d0, %a1 + + moveal %a1@, %a0 + movel %a0@(4), %sp@- /* push parent ip */ + movel %a1@(4), %sp@- /* push ip */ + + moveal ftrace_trace_function, %a0 + jsr %a0@ + + unlk %fp + +.globl ftrace_stub +ftrace_stub: + rts +END(mcount) +#endif + enosys: mov.l #sys_ni_syscall,%d3 bra 1f patches/ftrace-m68knommu-generic-stacktrace-function.patch0000664000076400007640000000612711043701644022746 0ustar tglxtglxFrom 616acbc45cdc24f145edd2960f6f6a0a5c2579b6 Mon Sep 17 00:00:00 2001 From: Sebastian Siewior Date: Wed, 9 Jul 2008 13:36:37 +0200 Subject: [PATCH] m68knommu: generic stacktrace function This provides the generic stack trace interface which is based on x86 and required by ftrace. A proper sollution will come once I unify this and the current m68knommu stack trace algo. Signed-off-by: Sebastian Siewior Signed-off-by: Thomas Gleixner --- arch/m68knommu/kernel/Makefile | 5 +- arch/m68knommu/kernel/stacktrace.c | 69 +++++++++++++++++++++++++++++++++++++ 2 files changed, 72 insertions(+), 2 deletions(-) create mode 100644 arch/m68knommu/kernel/stacktrace.c Index: linux-2.6.26/arch/m68knommu/kernel/Makefile =================================================================== --- linux-2.6.26.orig/arch/m68knommu/kernel/Makefile +++ linux-2.6.26/arch/m68knommu/kernel/Makefile @@ -7,5 +7,6 @@ extra-y := vmlinux.lds obj-y += dma.o entry.o init_task.o irq.o m68k_ksyms.o process.o ptrace.o \ setup.o signal.o syscalltable.o sys_m68k.o time.o traps.o -obj-$(CONFIG_MODULES) += module.o -obj-$(CONFIG_COMEMPCI) += comempci.o +obj-$(CONFIG_MODULES) += module.o +obj-$(CONFIG_COMEMPCI) += comempci.o +obj-$(CONFIG_STACKTRACE) += stacktrace.o Index: linux-2.6.26/arch/m68knommu/kernel/stacktrace.c =================================================================== --- /dev/null +++ linux-2.6.26/arch/m68knommu/kernel/stacktrace.c @@ -0,0 +1,69 @@ +/* + * Quick & dirty stacktrace implementation. + */ +#include +#include + +typedef void (save_stack_addr_t)(void *data, unsigned long addr, int reliable); + +static void save_stack_address(void *data, unsigned long addr, int reliable) +{ + struct stack_trace *trace = data; + if (!reliable) + return; + if (trace->skip > 0) { + trace->skip--; + return; + } + if (trace->nr_entries < trace->max_entries) + trace->entries[trace->nr_entries++] = addr; +} + +static void print_context_stack(unsigned long *stack, + save_stack_addr_t *sstack_func, struct stack_trace *trace) +{ + unsigned long *last_stack; + unsigned long *endstack; + unsigned long addr; + + addr = (unsigned long) stack; + endstack = (unsigned long *) PAGE_ALIGN(addr); + + last_stack = stack - 1; + while (stack <= endstack && stack > last_stack) { + + addr = *(stack + 1); + sstack_func(trace, addr, 1); + + last_stack = stack; + stack = (unsigned long *)*stack; + } +} + +static noinline long *get_current_stack(void) +{ + unsigned long *stack; + + stack = (unsigned long *)&stack; + stack++; + return stack; +} + +static void save_current_stack(save_stack_addr_t *sstack_func, + struct stack_trace *trace) +{ + unsigned long *stack; + + stack = get_current_stack(); + print_context_stack(stack, save_stack_address, trace); +} + +/* + * Save stack-backtrace addresses into a stack_trace buffer. + */ +void save_stack_trace(struct stack_trace *trace) +{ + save_current_stack(save_stack_address, trace); + if (trace->nr_entries < trace->max_entries) + trace->entries[trace->nr_entries++] = ULONG_MAX; +} patches/sched-enable-irqs-in-preempt-in-notifier-call.patch0000664000076400007640000000205511043547303022756 0ustar tglxtglxFrom: Thomas Gleixner Date: Mon, 14 Jan 2008 14:02:44 +0200 Subject: CFS: enable irqs in fire_sched_in_preempt_notifier KVM expects the notifier call with irqs enabled. It's necessary due to a possible IPI call. Make the preempt-rt version behave the same way as mainline. Signed-off-by: Thomas Gleixner --- kernel/sched.c | 9 +++++++++ 1 file changed, 9 insertions(+) Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -2353,8 +2353,17 @@ static void fire_sched_in_preempt_notifi struct preempt_notifier *notifier; struct hlist_node *node; + if (hlist_empty(&curr->preempt_notifiers)) + return; + + /* + * The KVM sched in notifier expects to be called with + * interrupts enabled. + */ + local_irq_enable(); hlist_for_each_entry(notifier, node, &curr->preempt_notifiers, link) notifier->ops->sched_in(notifier, raw_smp_processor_id()); + local_irq_disable(); } static void patches/spinlock-trylock-cleanup-sungem.patch0000664000076400007640000000116011043564054020506 0ustar tglxtglx--- drivers/net/sungem.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) Index: linux-2.6.26/drivers/net/sungem.c =================================================================== --- linux-2.6.26.orig/drivers/net/sungem.c +++ linux-2.6.26/drivers/net/sungem.c @@ -1033,10 +1033,8 @@ static int gem_start_xmit(struct sk_buff (csum_stuff_off << 21)); } - local_irq_save(flags); - if (!spin_trylock(&gp->tx_lock)) { + if (!spin_trylock_irqsave(&gp->tx_lock, flags)) { /* Tell upper layer to requeue */ - local_irq_restore(flags); return NETDEV_TX_LOCKED; } /* We raced with gem_do_stop() */ patches/x86_64-tsc-sync-irqflags-fix.patch0000664000076400007640000000140111043564054017345 0ustar tglxtglx--- arch/x86/kernel/tsc_sync.c | 4 ++++ 1 file changed, 4 insertions(+) Index: linux-2.6.26/arch/x86/kernel/tsc_sync.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/tsc_sync.c +++ linux-2.6.26/arch/x86/kernel/tsc_sync.c @@ -101,6 +101,7 @@ static __cpuinit void check_tsc_warp(voi */ void __cpuinit check_tsc_sync_source(int cpu) { + unsigned long flags; int cpus = 2; /* @@ -121,8 +122,11 @@ void __cpuinit check_tsc_sync_source(int /* * Wait for the target to arrive: */ + local_save_flags(flags); + local_irq_enable(); while (atomic_read(&start_count) != cpus-1) cpu_relax(); + local_irq_restore(flags); /* * Trigger the target to continue into the measurement too: */ patches/neptune-no-at-keyboard.patch0000664000076400007640000000331211043564054016547 0ustar tglxtglxneptune needs this to boot ... --- drivers/input/keyboard/atkbd.c | 15 +++++++++++++++ drivers/input/mouse/psmouse-base.c | 15 +++++++++++++++ 2 files changed, 30 insertions(+) Index: linux-2.6.26/drivers/input/keyboard/atkbd.c =================================================================== --- linux-2.6.26.orig/drivers/input/keyboard/atkbd.c +++ linux-2.6.26/drivers/input/keyboard/atkbd.c @@ -1455,8 +1455,23 @@ static struct dmi_system_id atkbd_dmi_qu { } }; +static int __read_mostly noatkbd; + +static int __init noatkbd_setup(char *str) +{ + noatkbd = 1; + printk(KERN_INFO "debug: not setting up AT keyboard.\n"); + + return 1; +} + +__setup("noatkbd", noatkbd_setup); + static int __init atkbd_init(void) { + if (noatkbd) + return 0; + dmi_check_system(atkbd_dmi_quirk_table); return serio_register_driver(&atkbd_drv); Index: linux-2.6.26/drivers/input/mouse/psmouse-base.c =================================================================== --- linux-2.6.26.orig/drivers/input/mouse/psmouse-base.c +++ linux-2.6.26/drivers/input/mouse/psmouse-base.c @@ -1597,10 +1597,25 @@ static int psmouse_get_maxproto(char *bu return sprintf(buffer, "%s\n", psmouse_protocol_by_type(type)->name); } +static int __read_mostly nopsmouse; + +static int __init nopsmouse_setup(char *str) +{ + nopsmouse = 1; + printk(KERN_INFO "debug: not setting up psmouse.\n"); + + return 1; +} + +__setup("nopsmouse", nopsmouse_setup); + static int __init psmouse_init(void) { int err; + if (nopsmouse) + return 0; + kpsmoused_wq = create_singlethread_workqueue("kpsmoused"); if (!kpsmoused_wq) { printk(KERN_ERR "psmouse: failed to create kpsmoused workqueue\n"); patches/rtmutex-debug.h-cleanup.patch0000664000076400007640000000300311043564054016723 0ustar tglxtglxSubject: [patch] lock debugging: clean up rtmutex-debug.h From: Ingo Molnar style cleanups. Signed-off-by: Ingo Molnar --- kernel/rtmutex-debug.h | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) Index: linux-2.6.26/kernel/rtmutex-debug.h =================================================================== --- linux-2.6.26.orig/kernel/rtmutex-debug.h +++ linux-2.6.26/kernel/rtmutex-debug.h @@ -17,17 +17,17 @@ extern void debug_rt_mutex_free_waiter(s extern void debug_rt_mutex_init(struct rt_mutex *lock, const char *name); extern void debug_rt_mutex_lock(struct rt_mutex *lock); extern void debug_rt_mutex_unlock(struct rt_mutex *lock); -extern void debug_rt_mutex_proxy_lock(struct rt_mutex *lock, - struct task_struct *powner); +extern void +debug_rt_mutex_proxy_lock(struct rt_mutex *lock, struct task_struct *powner); extern void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock); extern void debug_rt_mutex_deadlock(int detect, struct rt_mutex_waiter *waiter, struct rt_mutex *lock); extern void debug_rt_mutex_print_deadlock(struct rt_mutex_waiter *waiter); -# define debug_rt_mutex_reset_waiter(w) \ +# define debug_rt_mutex_reset_waiter(w) \ do { (w)->deadlock_lock = NULL; } while (0) -static inline int debug_rt_mutex_detect_deadlock(struct rt_mutex_waiter *waiter, - int detect) +static inline int +debug_rt_mutex_detect_deadlock(struct rt_mutex_waiter *waiter, int detect) { - return (waiter != NULL); + return waiter != NULL; } patches/netpoll-8139too-fix.patch0000664000076400007640000000116711043564054015652 0ustar tglxtglx--- drivers/net/8139too.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) Index: linux-2.6.26/drivers/net/8139too.c =================================================================== --- linux-2.6.26.orig/drivers/net/8139too.c +++ linux-2.6.26/drivers/net/8139too.c @@ -2199,7 +2199,11 @@ static irqreturn_t rtl8139_interrupt (in */ static void rtl8139_poll_controller(struct net_device *dev) { - disable_irq(dev->irq); + /* + * use _nosync() variant - might be used by netconsole + * from atomic contexts: + */ + disable_irq_nosync(dev->irq); rtl8139_interrupt(dev->irq, dev); enable_irq(dev->irq); } patches/kprobes-preempt-fix.patch0000664000076400007640000000334711043564054016172 0ustar tglxtglx arch/x86/kernel/kprobes.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) Index: linux-2.6.26/arch/x86/kernel/kprobes.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/kprobes.c +++ linux-2.6.26/arch/x86/kernel/kprobes.c @@ -451,7 +451,7 @@ static void __kprobes setup_singlestep(s /* Boost up -- we can execute copied instructions directly */ reset_current_kprobe(); regs->ip = (unsigned long)p->ainsn.insn; - preempt_enable_no_resched(); + preempt_enable(); return; } #endif @@ -477,7 +477,7 @@ static int __kprobes reenter_kprobe(stru arch_disarm_kprobe(p); regs->ip = (unsigned long)p->addr; reset_current_kprobe(); - preempt_enable_no_resched(); + preempt_enable(); break; #endif case KPROBE_HIT_ACTIVE: @@ -573,7 +573,7 @@ static int __kprobes kprobe_handler(stru } } /* else: not a kprobe fault; let the kernel handle it */ - preempt_enable_no_resched(); + preempt_enable(); return 0; } @@ -874,7 +874,7 @@ static int __kprobes post_kprobe_handler } reset_current_kprobe(); out: - preempt_enable_no_resched(); + preempt_enable(); /* * if somebody else is singlestepping across a probe point, flags @@ -908,7 +908,7 @@ int __kprobes kprobe_fault_handler(struc restore_previous_kprobe(kcb); else reset_current_kprobe(); - preempt_enable_no_resched(); + preempt_enable(); break; case KPROBE_HIT_ACTIVE: case KPROBE_HIT_SSDONE: @@ -1049,7 +1049,7 @@ int __kprobes longjmp_break_handler(stru memcpy((kprobe_opcode_t *)(kcb->jprobe_saved_sp), kcb->jprobes_stack, MIN_STACK_SIZE(kcb->jprobe_saved_sp)); - preempt_enable_no_resched(); + preempt_enable(); return 1; } return 0; patches/replace-bugon-by-warn-on.patch0000664000076400007640000000113311043564053016767 0ustar tglxtglx--- arch/x86/mm/highmem_32.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/arch/x86/mm/highmem_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/mm/highmem_32.c +++ linux-2.6.26/arch/x86/mm/highmem_32.c @@ -84,7 +84,7 @@ void *kmap_atomic_prot(struct page *page idx = type + KM_TYPE_NR*smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - BUG_ON(!pte_none(*(kmap_pte-idx))); + WARN_ON_ONCE(!pte_none(*(kmap_pte-idx))); set_pte(kmap_pte-idx, mk_pte(page, prot)); arch_flush_lazy_mmu_mode(); patches/i386-mark-atomic-irq-ops-raw.patch0000664000076400007640000000115511043564053017333 0ustar tglxtglx--- include/asm-x86/atomic_32.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6.26/include/asm-x86/atomic_32.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/atomic_32.h +++ linux-2.6.26/include/asm-x86/atomic_32.h @@ -188,10 +188,10 @@ static inline int atomic_add_return(int #ifdef CONFIG_M386 no_xadd: /* Legacy 386 processor */ - local_irq_save(flags); + raw_local_irq_save(flags); __i = atomic_read(v); atomic_set(v, i + __i); - local_irq_restore(flags); + raw_local_irq_restore(flags); return i + __i; #endif } patches/msi-suspend-resume-workaround.patch0000664000076400007640000000072111043564053020215 0ustar tglxtglx--- drivers/pci/msi.c | 4 ++++ 1 file changed, 4 insertions(+) Index: linux-2.6.26/drivers/pci/msi.c =================================================================== --- linux-2.6.26.orig/drivers/pci/msi.c +++ linux-2.6.26/drivers/pci/msi.c @@ -285,6 +285,10 @@ static void __pci_restore_msi_state(stru return; entry = get_irq_msi(dev->irq); + if (!entry) { + WARN_ON(1); + return; + } pos = entry->msi_attrib.pos; pci_intx_for_msi(dev, 0); patches/floppy-resume-fix.patch0000664000076400007640000000411211043564053015650 0ustar tglxtglxSubject: [patch] floppy: suspend/resume fix From: Ingo Molnar introduce a floppy platform-driver and suspend/resume ops to stop/start the floppy driver. Bug reported by Mikael Pettersson. Signed-off-by: Ingo Molnar --- drivers/block/floppy.c | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) Index: linux-2.6.26/drivers/block/floppy.c =================================================================== --- linux-2.6.26.orig/drivers/block/floppy.c +++ linux-2.6.26/drivers/block/floppy.c @@ -4145,6 +4145,28 @@ static void floppy_device_release(struct { } +static int floppy_suspend(struct platform_device *dev, pm_message_t state) +{ + floppy_release_irq_and_dma(); + + return 0; +} + +static int floppy_resume(struct platform_device *dev) +{ + floppy_grab_irq_and_dma(); + + return 0; +} + +static struct platform_driver floppy_driver = { + .suspend = floppy_suspend, + .resume = floppy_resume, + .driver = { + .name = "floppy", + }, +}; + static struct platform_device floppy_device[N_DRIVE]; static struct kobject *floppy_find(dev_t dev, int *part, void *data) @@ -4193,10 +4215,14 @@ static int __init floppy_init(void) if (err) goto out_put_disk; + err = platform_driver_register(&floppy_driver); + if (err) + goto out_unreg_blkdev; + floppy_queue = blk_init_queue(do_fd_request, &floppy_lock); if (!floppy_queue) { err = -ENOMEM; - goto out_unreg_blkdev; + goto out_unreg_driver; } blk_queue_max_sectors(floppy_queue, 64); @@ -4345,6 +4371,8 @@ out_flush_work: out_unreg_region: blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); blk_cleanup_queue(floppy_queue); +out_unreg_driver: + platform_driver_unregister(&floppy_driver); out_unreg_blkdev: unregister_blkdev(FLOPPY_MAJOR, "fd"); out_put_disk: @@ -4541,6 +4569,7 @@ static void __exit floppy_module_exit(vo blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); unregister_blkdev(FLOPPY_MAJOR, "fd"); + platform_driver_unregister(&floppy_driver); for (drive = 0; drive < N_DRIVE; drive++) { del_timer_sync(&motor_off_timer[drive]); patches/hrtimers-overrun-api.patch0000664000076400007640000000277411043564053016373 0ustar tglxtglx--- include/linux/hrtimer.h | 4 ++++ kernel/hrtimer.c | 22 ++++++++++++++++++++++ 2 files changed, 26 insertions(+) Index: linux-2.6.26/include/linux/hrtimer.h =================================================================== --- linux-2.6.26.orig/include/linux/hrtimer.h +++ linux-2.6.26/include/linux/hrtimer.h @@ -336,6 +336,10 @@ static inline u64 hrtimer_forward_now(st return hrtimer_forward(timer, timer->base->get_time(), interval); } +/* Overrun count: */ +extern unsigned long +hrtimer_overrun(struct hrtimer *timer, ktime_t now, ktime_t interval); + /* Precise sleep: */ extern long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, Index: linux-2.6.26/kernel/hrtimer.c =================================================================== --- linux-2.6.26.orig/kernel/hrtimer.c +++ linux-2.6.26/kernel/hrtimer.c @@ -825,6 +825,28 @@ u64 hrtimer_forward(struct hrtimer *time } EXPORT_SYMBOL_GPL(hrtimer_forward); +unsigned long +hrtimer_overrun(struct hrtimer *timer, ktime_t now, ktime_t interval) +{ + unsigned long orun = 1; + ktime_t delta; + + delta = ktime_sub(now, timer->expires); + + if (delta.tv64 < 0) + return 0; + + if (interval.tv64 < timer->base->resolution.tv64) + interval.tv64 = timer->base->resolution.tv64; + + if (unlikely(delta.tv64 >= interval.tv64)) + orun = ktime_divns(delta, ktime_to_ns(interval)) + 1; + + return orun; +} +EXPORT_SYMBOL_GPL(hrtimer_overrun); + + /* * enqueue_hrtimer - internal function to (re)start a timer * patches/mm-fix-latency.patch0000664000076400007640000000556311043564053015122 0ustar tglxtglxFrom: Hugh Dickins Subject: reduce pagetable-freeing latencies 2.6.15-rc1 moved the unlinking of a vma from its prio_tree and anon_vma into free_pgtables: so the vma is hidden from rmap and vmtruncate before freeing its page tables, allowing safe descent without page table lock. But free_pgtables is still called with preemption disabled, and Lee Revell has now detected high latency there. The right fix will be to rework the mmu_gathering, not to need preemption disabled; but for now an ugly CONFIG_PREEMPT block in free_pgtables, to make an initial unlinking pass with preemption enabled - made uglier by CONFIG_IA64 definitions (only ia64 actually uses the start and end given to tlb_finish_mmu, and our floor and ceiling don't quite work for those). These CONFIG choices being to minimize the additional TLB flushing. Signed-off-by: Hugh Dickins Signed-off-by: Ingo Molnar -- mm/memory.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) Index: linux-2.6.26/mm/memory.c =================================================================== --- linux-2.6.26.orig/mm/memory.c +++ linux-2.6.26/mm/memory.c @@ -271,18 +271,48 @@ void free_pgd_range(struct mmu_gather ** } while (pgd++, addr = next, addr != end); } +#ifdef CONFIG_IA64 +#define tlb_start_addr(tlb) (tlb)->start_addr +#define tlb_end_addr(tlb) (tlb)->end_addr +#else +#define tlb_start_addr(tlb) 0UL /* only ia64 really uses it */ +#define tlb_end_addr(tlb) 0UL /* only ia64 really uses it */ +#endif + void free_pgtables(struct mmu_gather **tlb, struct vm_area_struct *vma, unsigned long floor, unsigned long ceiling) { +#ifdef CONFIG_PREEMPT + struct vm_area_struct *unlink = vma; + int fullmm = (*tlb)->fullmm; + + if (!vma) /* Sometimes when exiting after an oops */ + return; + if (vma->vm_next) + tlb_finish_mmu(*tlb, tlb_start_addr(*tlb), tlb_end_addr(*tlb)); + /* + * Hide vma from rmap and vmtruncate before freeeing pgtables, + * with preemption enabled, except when unmapping just one area. + */ + while (unlink) { + anon_vma_unlink(unlink); + unlink_file_vma(unlink); + unlink = unlink->vm_next; + } + if (vma->vm_next) + *tlb = tlb_gather_mmu(vma->vm_mm, fullmm); +#endif while (vma) { struct vm_area_struct *next = vma->vm_next; unsigned long addr = vma->vm_start; +#ifndef CONFIG_PREEMPT /* * Hide vma from rmap and vmtruncate before freeing pgtables */ anon_vma_unlink(vma); unlink_file_vma(vma); +#endif if (is_vm_hugetlb_page(vma)) { hugetlb_free_pgd_range(tlb, addr, vma->vm_end, @@ -295,8 +325,10 @@ void free_pgtables(struct mmu_gather **t && !is_vm_hugetlb_page(next)) { vma = next; next = vma->vm_next; +#ifndef CONFIG_PREEMPT anon_vma_unlink(vma); unlink_file_vma(vma); +#endif } free_pgd_range(tlb, addr, vma->vm_end, floor, next? next->vm_start: ceiling); patches/ioapic-fix-too-fast-clocks.patch0000664000076400007640000000302711043564052017316 0ustar tglxtglxFrom: Akira Tsukamoto This one line patch adds upper bound testing inside timer_irq_works() when evaluating whether irq timer works or not on boot up. It fix the machines having problem with clock running too fast. What this patch do is, if timer interrupts running too fast through IO-APIC IRQ then false back to i8259A IRQ. I really appreciate for the feedback from ATI Xpress 200 chipset user, It should eliminate the needs of adding no_timer_check on kernel options. I have NEC laptop using ATI Xpress 200 chipset with Pentium M 1.8GHz and its clock keep going forward when kernel compiled with local APIC support. Many machines based on RS200 chipset seem to have the same problem, including Acer Ferrari 400X AMD notebook or Compaq R4000. Also I would like to have comments on upper bound limit, 16 ticks, which I chose in this patch. My laptop always reports around 20, which is double from normal. arch/x86/kernel/io_apic_32.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: linux-2.6.26/arch/x86/kernel/io_apic_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/io_apic_32.c +++ linux-2.6.26/arch/x86/kernel/io_apic_32.c @@ -1864,7 +1864,8 @@ static int __init timer_irq_works(void) * might have cached one ExtINT interrupt. Finally, at * least one tick may be lost due to delays. */ - if (time_after(jiffies, t1 + 4)) + if (time_after(jiffies, t1 + 4) && + time_before(jiffies, t1 + 16)) return 1; return 0; patches/fix-acpi-build-weirdness.patch0000664000076400007640000000136211043564052017056 0ustar tglxtglx arch/x86/pci/Makefile_32 | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: linux-2.6.26/arch/x86/pci/Makefile_32 =================================================================== --- linux-2.6.26.orig/arch/x86/pci/Makefile_32 +++ linux-2.6.26/arch/x86/pci/Makefile_32 @@ -5,12 +5,13 @@ obj-$(CONFIG_PCI_MMCONFIG) += mmconfig_3 obj-$(CONFIG_PCI_DIRECT) += direct.o obj-$(CONFIG_PCI_OLPC) += olpc.o +obj-$(CONFIG_ACPI) += acpi.o + pci-y := fixup.o # Do not change the ordering here. There is a nasty init function # ordering dependency which breaks when you move acpi.o below # legacy/irq.o -pci-$(CONFIG_ACPI) += acpi.o pci-y += legacy.o irq.o # Careful: VISWS and NUMAQ overrule the pci-y above. The colons are patches/move-native-irq.patch0000664000076400007640000000170311043564052015302 0ustar tglxtglx--- kernel/irq/migration.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) Index: linux-2.6.26/kernel/irq/migration.c =================================================================== --- linux-2.6.26.orig/kernel/irq/migration.c +++ linux-2.6.26/kernel/irq/migration.c @@ -61,6 +61,7 @@ void move_masked_irq(int irq) void move_native_irq(int irq) { struct irq_desc *desc = irq_desc + irq; + int mask = 1; if (likely(!(desc->status & IRQ_MOVE_PENDING))) return; @@ -68,8 +69,17 @@ void move_native_irq(int irq) if (unlikely(desc->status & IRQ_DISABLED)) return; - desc->chip->mask(irq); + /* + * If the irq is already in progress, it should be masked. + * If we unmask it, we might cause an interrupt storm on RT. + */ + if (unlikely(desc->status & IRQ_INPROGRESS)) + mask = 0; + + if (mask) + desc->chip->mask(irq); move_masked_irq(irq); - desc->chip->unmask(irq); + if (mask) + desc->chip->unmask(irq); } patches/dont-unmask-io_apic.patch0000664000076400007640000000130011043564052016111 0ustar tglxtglx--- arch/x86/kernel/io_apic_64.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: linux-2.6.26/arch/x86/kernel/io_apic_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/io_apic_64.c +++ linux-2.6.26/arch/x86/kernel/io_apic_64.c @@ -1450,7 +1450,8 @@ static void ack_apic_level(unsigned int irq_complete_move(irq); #ifdef CONFIG_GENERIC_PENDING_IRQ /* If we are moving the irq we need to mask it */ - if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) { + if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING) && + !(irq_desc[irq].status & IRQ_INPROGRESS)) { do_unmask_irq = 1; mask_IO_APIC_irq(irq); } patches/gcc-warnings-shut-up.patch0000664000076400007640000000104211043564052016240 0ustar tglxtglx net/core/flow.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/net/core/flow.c =================================================================== --- linux-2.6.26.orig/net/core/flow.c +++ linux-2.6.26/net/core/flow.c @@ -168,7 +168,7 @@ static int flow_key_compare(struct flowi void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir, flow_resolve_t resolver) { - struct flow_cache_entry *fle, **head; + struct flow_cache_entry *fle, **head = NULL /* shut up GCC */; unsigned int hash; int cpu; patches/nfs-stats-miss-preemption.patch0000664000076400007640000000233511043564052017334 0ustar tglxtglxSubject: nfs: fix missing preemption check From: Thomas Gleixner Date: Sun, 27 Jul 2008 00:54:19 +0200 NFS iostats use get_cpu()/put_cpu_no_preempt(). That misses a preemption check for no good reason and introduces long latencies when a wakeup of a higher priority task happens in the preempt disabled region. Signed-off-by: Thomas Gleixner --- fs/nfs/iostat.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6.26/fs/nfs/iostat.h =================================================================== --- linux-2.6.26.orig/fs/nfs/iostat.h +++ linux-2.6.26/fs/nfs/iostat.h @@ -125,7 +125,7 @@ static inline void nfs_inc_server_stats( cpu = get_cpu(); iostats = per_cpu_ptr(server->io_stats, cpu); iostats->events[stat] ++; - put_cpu_no_resched(); + put_cpu(); } static inline void nfs_inc_stats(struct inode *inode, enum nfs_stat_eventcounters stat) @@ -141,7 +141,7 @@ static inline void nfs_add_server_stats( cpu = get_cpu(); iostats = per_cpu_ptr(server->io_stats, cpu); iostats->bytes[stat] += addend; - put_cpu_no_resched(); + put_cpu(); } static inline void nfs_add_stats(struct inode *inode, enum nfs_stat_bytecounters stat, unsigned long addend) patches/random-driver-latency-fix.patch0000664000076400007640000000166611043564051017260 0ustar tglxtglx drivers/char/random.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) Index: linux-2.6.26/drivers/char/random.c =================================================================== --- linux-2.6.26.orig/drivers/char/random.c +++ linux-2.6.26/drivers/char/random.c @@ -581,8 +581,11 @@ static void add_timer_randomness(struct preempt_disable(); /* if over the trickle threshold, use only 1 in 4096 samples */ if (input_pool.entropy_count > trickle_thresh && - (__get_cpu_var(trickle_count)++ & 0xfff)) - goto out; + (__get_cpu_var(trickle_count)++ & 0xfff)) { + preempt_enable(); + return; + } + preempt_enable(); sample.jiffies = jiffies; sample.cycles = get_cycles(); @@ -624,8 +627,6 @@ static void add_timer_randomness(struct credit_entropy_bits(&input_pool, min_t(int, fls(delta>>1), 11)); } -out: - preempt_enable(); } void add_input_randomness(unsigned int type, unsigned int code, patches/apic-dumpstack.patch0000664000076400007640000000072411043564051015165 0ustar tglxtglx arch/x86/kernel/apic_32.c | 1 + 1 file changed, 1 insertion(+) Index: linux-2.6.26/arch/x86/kernel/apic_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/apic_32.c +++ linux-2.6.26/arch/x86/kernel/apic_32.c @@ -1337,6 +1337,7 @@ void smp_error_interrupt(struct pt_regs */ printk(KERN_DEBUG "APIC error on CPU%d: %02lx(%02lx)\n", smp_processor_id(), v , v1); + dump_stack(); irq_exit(); } patches/nmi-profiling-base.patch0000664000076400007640000002653511043564051015752 0ustar tglxtglxSubject: [patch] nmi-driven profiling for /proc/profile From: Ingo Molnar nmi-driven profiling for /proc/profile Signed-off-by: Ingo Molnar --- arch/x86/kernel/crash.c | 8 ---- arch/x86/kernel/irq_64.c | 2 + arch/x86/kernel/nmi_32.c | 89 ++++++++++++++++++++++++++++++++++++++++++---- arch/x86/kernel/nmi_64.c | 64 +++++++++++++++++++++++++++++++-- include/asm-x86/apic.h | 2 + include/linux/profile.h | 1 include/linux/sched.h | 1 kernel/profile.c | 9 +++- kernel/time/tick-common.c | 1 kernel/time/tick-sched.c | 2 - 10 files changed, 155 insertions(+), 24 deletions(-) Index: linux-2.6.26/arch/x86/kernel/crash.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/crash.c +++ linux-2.6.26/arch/x86/kernel/crash.c @@ -75,14 +75,6 @@ static int crash_nmi_callback(struct not return 1; } -static void smp_send_nmi_allbutself(void) -{ - cpumask_t mask = cpu_online_map; - cpu_clear(safe_smp_processor_id(), mask); - if (!cpus_empty(mask)) - send_IPI_mask(mask, NMI_VECTOR); -} - static struct notifier_block crash_nmi_nb = { .notifier_call = crash_nmi_callback, }; Index: linux-2.6.26/arch/x86/kernel/irq_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/irq_64.c +++ linux-2.6.26/arch/x86/kernel/irq_64.c @@ -166,6 +166,8 @@ asmlinkage unsigned int do_IRQ(struct pt unsigned vector = ~regs->orig_ax; unsigned irq; + irq_show_regs_callback(smp_processor_id(), regs); + exit_idle(); irq_enter(); irq = __get_cpu_var(vector_irq)[vector]; Index: linux-2.6.26/arch/x86/kernel/nmi_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/nmi_32.c +++ linux-2.6.26/arch/x86/kernel/nmi_32.c @@ -26,6 +26,7 @@ #include #include +#include #include "mach_traps.h" @@ -43,7 +44,7 @@ static cpumask_t backtrace_mask = CPU_MA atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */ unsigned int nmi_watchdog = NMI_DEFAULT; -static unsigned int nmi_hz = HZ; +static unsigned int nmi_hz = 1000; static DEFINE_PER_CPU(short, wd_enabled); @@ -93,7 +94,7 @@ int __init check_nmi_watchdog(void) for_each_possible_cpu(cpu) prev_nmi_count[cpu] = nmi_count(cpu); local_irq_enable(); - mdelay((20*1000)/nmi_hz); // wait 20 ticks + mdelay((100*1000)/nmi_hz); // wait 100 ticks for_each_possible_cpu(cpu) { #ifdef CONFIG_SMP @@ -316,6 +317,46 @@ EXPORT_SYMBOL(touch_nmi_watchdog); extern void die_nmi(struct pt_regs *, const char *msg); +int nmi_show_regs[NR_CPUS]; + +void nmi_show_all_regs(void) +{ + int i; + + if (system_state == SYSTEM_BOOTING) + return; + + printk(KERN_WARNING "nmi_show_all_regs(): start on CPU#%d.\n", + raw_smp_processor_id()); + dump_stack(); + + for_each_online_cpu(i) + nmi_show_regs[i] = 1; + + smp_send_nmi_allbutself(); + + for_each_online_cpu(i) { + while (nmi_show_regs[i] == 1) + barrier(); + } +} + +static DEFINE_SPINLOCK(nmi_print_lock); + +void irq_show_regs_callback(int cpu, struct pt_regs *regs) +{ + if (!nmi_show_regs[cpu]) + return; + + nmi_show_regs[cpu] = 0; + spin_lock(&nmi_print_lock); + printk(KERN_WARNING "NMI show regs on CPU#%d:\n", cpu); + printk(KERN_WARNING "apic_timer_irqs: %d\n", + per_cpu(irq_stat, cpu).apic_timer_irqs); + show_regs(regs); + spin_unlock(&nmi_print_lock); +} + notrace __kprobes int nmi_watchdog_tick(struct pt_regs *regs, unsigned reason) { @@ -330,6 +371,8 @@ nmi_watchdog_tick(struct pt_regs *regs, int cpu = smp_processor_id(); int rc = 0; + __profile_tick(CPU_PROFILING, regs); + /* check for other users first */ if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) { @@ -354,6 +397,9 @@ nmi_watchdog_tick(struct pt_regs *regs, sum = per_cpu(irq_stat, cpu).apic_timer_irqs + per_cpu(irq_stat, cpu).irq0_irqs; + irq_show_regs_callback(cpu, regs); + + /* if the apic timer isn't firing, this cpu isn't doing much */ /* if the none of the timers isn't firing, this cpu isn't doing much */ if (!touched && last_irq_sums[cpu] == sum) { /* @@ -361,11 +407,30 @@ nmi_watchdog_tick(struct pt_regs *regs, * wait a few IRQs (5 seconds) before doing the oops ... */ alert_counter[cpu]++; - if (alert_counter[cpu] == 5*nmi_hz) - /* - * die_nmi will return ONLY if NOTIFY_STOP happens.. - */ - die_nmi(regs, "BUG: NMI Watchdog detected LOCKUP"); + if (alert_counter[cpu] && !(alert_counter[cpu] % (5*nmi_hz))) { + int i; + + spin_lock(&nmi_print_lock); + printk(KERN_WARNING "NMI watchdog detected lockup on " + "CPU#%d (%d/%d)\n", cpu, alert_counter[cpu], + 5*nmi_hz); + show_regs(regs); + spin_unlock(&nmi_print_lock); + + for_each_online_cpu(i) { + if (i == cpu) + continue; + nmi_show_regs[i] = 1; + while (nmi_show_regs[i] == 1) + cpu_relax(); + } + printk(KERN_WARNING "NMI watchdog running again ...\n"); + for_each_online_cpu(i) + alert_counter[i] = 0; + + + } + } else { last_irq_sums[cpu] = sum; alert_counter[cpu] = 0; @@ -463,5 +528,15 @@ void __trigger_all_cpu_backtrace(void) } } +void smp_send_nmi_allbutself(void) +{ +#ifdef CONFIG_SMP + cpumask_t mask = cpu_online_map; + cpu_clear(safe_smp_processor_id(), mask); + if (!cpus_empty(mask)) + send_IPI_mask(mask, NMI_VECTOR); +#endif +} + EXPORT_SYMBOL(nmi_active); EXPORT_SYMBOL(nmi_watchdog); Index: linux-2.6.26/arch/x86/kernel/nmi_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/nmi_64.c +++ linux-2.6.26/arch/x86/kernel/nmi_64.c @@ -20,11 +20,13 @@ #include #include #include +#include #include #include #include #include +#include #include @@ -44,7 +46,7 @@ atomic_t nmi_active = ATOMIC_INIT(0); / static int panic_on_timeout; unsigned int nmi_watchdog = NMI_DEFAULT; -static unsigned int nmi_hz = HZ; +static unsigned int nmi_hz = 1000; static DEFINE_PER_CPU(short, wd_enabled); @@ -299,7 +301,7 @@ void touch_nmi_watchdog(void) unsigned cpu; /* - * Tell other CPUs to reset their alert counters. We cannot + * Tell other CPUs to reset their alert counters. We cannot * do it ourselves because the alert count increase is not * atomic. */ @@ -313,6 +315,41 @@ void touch_nmi_watchdog(void) } EXPORT_SYMBOL(touch_nmi_watchdog); +int nmi_show_regs[NR_CPUS]; + +void nmi_show_all_regs(void) +{ + int i; + + if (system_state == SYSTEM_BOOTING) + return; + + smp_send_nmi_allbutself(); + + for_each_online_cpu(i) + nmi_show_regs[i] = 1; + + for_each_online_cpu(i) { + while (nmi_show_regs[i] == 1) + barrier(); + } +} + +static DEFINE_SPINLOCK(nmi_print_lock); + +void irq_show_regs_callback(int cpu, struct pt_regs *regs) +{ + if (!nmi_show_regs[cpu]) + return; + + nmi_show_regs[cpu] = 0; + spin_lock(&nmi_print_lock); + printk(KERN_WARNING "NMI show regs on CPU#%d:\n", cpu); + printk(KERN_WARNING "apic_timer_irqs: %d\n", read_pda(apic_timer_irqs)); + show_regs(regs); + spin_unlock(&nmi_print_lock); +} + notrace __kprobes int nmi_watchdog_tick(struct pt_regs *regs, unsigned reason) { @@ -321,6 +358,9 @@ nmi_watchdog_tick(struct pt_regs *regs, int cpu = smp_processor_id(); int rc = 0; + irq_show_regs_callback(cpu, regs); + __profile_tick(CPU_PROFILING, regs); + /* check for other users first */ if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) { @@ -357,9 +397,20 @@ nmi_watchdog_tick(struct pt_regs *regs, * wait a few IRQs (5 seconds) before doing the oops ... */ local_inc(&__get_cpu_var(alert_counter)); - if (local_read(&__get_cpu_var(alert_counter)) == 5*nmi_hz) + if (local_read(&__get_cpu_var(alert_counter)) == 5*nmi_hz) { + int i; + + for_each_online_cpu(i) { + if (i == cpu) + continue; + nmi_show_regs[i] = 1; + while (nmi_show_regs[i] == 1) + cpu_relax(); + } + die_nmi("NMI Watchdog detected LOCKUP on CPU %d\n", regs, panic_on_timeout); + } } else { __get_cpu_var(last_irq_sum) = sum; local_set(&__get_cpu_var(alert_counter), 0); @@ -478,5 +529,12 @@ void __trigger_all_cpu_backtrace(void) } } +void smp_send_nmi_allbutself(void) +{ +#ifdef CONFIG_SMP + send_IPI_allbutself(NMI_VECTOR); +#endif +} + EXPORT_SYMBOL(nmi_active); EXPORT_SYMBOL(nmi_watchdog); Index: linux-2.6.26/include/asm-x86/apic.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/apic.h +++ linux-2.6.26/include/asm-x86/apic.h @@ -138,4 +138,6 @@ static inline void lapic_shutdown(void) #endif /* !CONFIG_X86_LOCAL_APIC */ +extern void smp_send_nmi_allbutself(void); + #endif /* __ASM_APIC_H */ Index: linux-2.6.26/include/linux/profile.h =================================================================== --- linux-2.6.26.orig/include/linux/profile.h +++ linux-2.6.26/include/linux/profile.h @@ -21,6 +21,7 @@ struct notifier_block; /* init basic kernel profiler */ void __init profile_init(void); +void __profile_tick(int type, struct pt_regs *regs); void profile_tick(int); /* Index: linux-2.6.26/include/linux/sched.h =================================================================== --- linux-2.6.26.orig/include/linux/sched.h +++ linux-2.6.26/include/linux/sched.h @@ -271,6 +271,7 @@ static inline void show_state(void) } extern void show_regs(struct pt_regs *); +extern void irq_show_regs_callback(int cpu, struct pt_regs *regs); /* * TASK is a pointer to the task whose backtrace we want to see (or NULL for current Index: linux-2.6.26/kernel/profile.c =================================================================== --- linux-2.6.26.orig/kernel/profile.c +++ linux-2.6.26/kernel/profile.c @@ -407,16 +407,19 @@ void profile_hits(int type, void *__pc, #endif /* !CONFIG_SMP */ EXPORT_SYMBOL_GPL(profile_hits); -void profile_tick(int type) +void __profile_tick(int type, struct pt_regs *regs) { - struct pt_regs *regs = get_irq_regs(); - if (type == CPU_PROFILING && timer_hook) timer_hook(regs); if (!user_mode(regs) && cpu_isset(smp_processor_id(), prof_cpu_mask)) profile_hit(type, (void *)profile_pc(regs)); } +void profile_tick(int type) +{ + return __profile_tick(type, get_irq_regs()); +} + #ifdef CONFIG_PROC_FS #include #include Index: linux-2.6.26/kernel/time/tick-common.c =================================================================== --- linux-2.6.26.orig/kernel/time/tick-common.c +++ linux-2.6.26/kernel/time/tick-common.c @@ -70,7 +70,6 @@ static void tick_periodic(int cpu) } update_process_times(user_mode(get_irq_regs())); - profile_tick(CPU_PROFILING); } /* Index: linux-2.6.26/kernel/time/tick-sched.c =================================================================== --- linux-2.6.26.orig/kernel/time/tick-sched.c +++ linux-2.6.26/kernel/time/tick-sched.c @@ -478,7 +478,6 @@ static void tick_nohz_handler(struct clo } update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING); /* Do not restart, when we are in the idle loop */ if (ts->tick_stopped) @@ -585,7 +584,6 @@ static enum hrtimer_restart tick_sched_t ts->idle_jiffies++; } update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING); } /* Do not restart, when we are in the idle loop */ patches/latency-tracing-ppc.patch0000664000076400007640000000143111043564051016120 0ustar tglxtglx arch/ppc/boot/Makefile | 9 +++++++++ 1 file changed, 9 insertions(+) Index: linux-2.6.26/arch/ppc/boot/Makefile =================================================================== --- linux-2.6.26.orig/arch/ppc/boot/Makefile +++ linux-2.6.26/arch/ppc/boot/Makefile @@ -15,6 +15,15 @@ # KBUILD_CFLAGS used when building rest of boot (takes effect recursively) KBUILD_CFLAGS += -fno-builtin -D__BOOTER__ -Iarch/$(ARCH)/boot/include + +ifdef CONFIG_MCOUNT +# do not trace the boot loader +nullstring := +space := $(nullstring) # end of the line +pg_flag = $(nullstring) -pg # end of the line +KBUILD_CFLAGS := $(subst ${pg_flag},${space},${KBUILD_CFLAGS}) +endif + HOSTCFLAGS += -Iarch/$(ARCH)/boot/include BOOT_TARGETS = zImage zImage.initrd znetboot znetboot.initrd patches/latency-tracing-arm.patch0000664000076400007640000002653311043564051016127 0ustar tglxtglx arch/arm/boot/compressed/head.S | 13 ++++ arch/arm/kernel/entry-common.S | 109 ++++++++++++++++++++++++++++++++++++++++ arch/arm/kernel/fiq.c | 4 - arch/arm/kernel/irq.c | 2 arch/arm/mm/copypage-v4mc.c | 4 - arch/arm/mm/copypage-xscale.c | 4 - arch/arm/mm/fault.c | 14 ++--- include/asm-arm/pgalloc.h | 4 - include/asm-arm/timex.h | 10 +++ include/asm-arm/unistd.h | 4 + 10 files changed, 151 insertions(+), 17 deletions(-) Index: linux-2.6.26/arch/arm/boot/compressed/head.S =================================================================== --- linux-2.6.26.orig/arch/arm/boot/compressed/head.S +++ linux-2.6.26/arch/arm/boot/compressed/head.S @@ -941,6 +941,19 @@ memdump: mov r12, r0 #endif .ltorg +#ifdef CONFIG_MCOUNT +/* CONFIG_MCOUNT causes boot header to be built with -pg requiring this + * trampoline + */ + .text + .align 0 + .type mcount %function + .global mcount +mcount: + mov pc, lr @ just return +#endif + + reloc_end: .align Index: linux-2.6.26/arch/arm/kernel/entry-common.S =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/entry-common.S +++ linux-2.6.26/arch/arm/kernel/entry-common.S @@ -3,6 +3,8 @@ * * Copyright (C) 2000 Russell King * + * FUNCTION_TRACE/mcount support (C) 2005 Timesys john.cooper@timesys.com + * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. @@ -451,5 +453,112 @@ ENTRY(sys_oabi_call_table) #undef ABI #undef OBSOLETE +#ifdef CONFIG_FRAME_POINTER + +#ifdef CONFIG_MCOUNT +/* + * At the point where we are in mcount() we maintain the + * frame of the prologue code and keep the call to mcount() + * out of the stack frame list: + + saved pc <---\ caller of instrumented routine + saved lr | + ip/prev_sp | + fp -----^ | + : | + | + -> saved pc | instrumented routine + | saved lr | + | ip/prev_sp | + | fp ---------/ + | : + | + | mcount + | saved pc + | saved lr + | ip/prev sp + -- fp + r3 + r2 + r1 + sp-> r0 + : + */ + + .text + .align 0 + .type mcount %function + .global mcount + +/* gcc -pg generated FUNCTION_PROLOGUE references mcount() + * and has already created the stack frame invocation for + * the routine we have been called to instrument. We create + * a complete frame nevertheless, as we want to use the same + * call to mcount() from c code. + */ +mcount: + + ldr ip, =mcount_enabled @ leave early, if disabled + ldr ip, [ip] + cmp ip, #0 + moveq pc,lr + + mov ip, sp + stmdb sp!, {r0 - r3, fp, ip, lr, pc} @ create stack frame + + ldr r1, [fp, #-4] @ get lr (the return address + @ of the caller of the + @ instrumented function) + mov r0, lr @ get lr - (the return address + @ of the instrumented function) + + sub fp, ip, #4 @ point fp at this frame + + bl __trace +1: + ldmdb fp, {r0 - r3, fp, sp, pc} @ pop entry frame and return + +#endif + +/* ARM replacement for unsupported gcc __builtin_return_address(n) + * where 0 < n. n == 0 is supported here as well. + * + * Walk up the stack frame until the desired frame is found or a NULL + * fp is encountered, return NULL in the latter case. + * + * Note: it is possible under code optimization for the stack invocation + * of an ancestor function (level N) to be removed before calling a + * descendant function (level N+1). No easy means is available to deduce + * this scenario with the result being [for example] caller_addr(0) when + * called from level N+1 returning level N-1 rather than the expected + * level N. This optimization issue appears isolated to the case of + * a call to a level N+1 routine made at the tail end of a level N + * routine -- the level N frame is deleted and a simple branch is made + * to the level N+1 routine. + */ + + .text + .align 0 + .type arm_return_addr %function + .global arm_return_addr + +arm_return_addr: + mov ip, r0 + mov r0, fp +3: + cmp r0, #0 + beq 1f @ frame list hit end, bail + cmp ip, #0 + beq 2f @ reached desired frame + ldr r0, [r0, #-12] @ else continue, get next fp + sub ip, ip, #1 + b 3b +2: + ldr r0, [r0, #-4] @ get target return address +1: + mov pc, lr + +#endif + #endif Index: linux-2.6.26/arch/arm/kernel/fiq.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/fiq.c +++ linux-2.6.26/arch/arm/kernel/fiq.c @@ -89,7 +89,7 @@ void set_fiq_handler(void *start, unsign * disable irqs for the duration. Note - these functions are almost * entirely coded in assembly. */ -void __attribute__((naked)) set_fiq_regs(struct pt_regs *regs) +void notrace __attribute__((naked)) set_fiq_regs(struct pt_regs *regs) { register unsigned long tmp; asm volatile ( @@ -107,7 +107,7 @@ void __attribute__((naked)) set_fiq_regs : "r" (®s->ARM_r8), "I" (PSR_I_BIT | PSR_F_BIT | FIQ_MODE)); } -void __attribute__((naked)) get_fiq_regs(struct pt_regs *regs) +void notrace __attribute__((naked)) get_fiq_regs(struct pt_regs *regs) { register unsigned long tmp; asm volatile ( Index: linux-2.6.26/arch/arm/kernel/irq.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/irq.c +++ linux-2.6.26/arch/arm/kernel/irq.c @@ -110,7 +110,7 @@ static struct irq_desc bad_irq_desc = { * come via this function. Instead, they should provide their * own 'handler' */ -asmlinkage void __exception asm_do_IRQ(unsigned int irq, struct pt_regs *regs) +asmlinkage void __exception notrace asm_do_IRQ(unsigned int irq, struct pt_regs *regs) { struct pt_regs *old_regs = set_irq_regs(regs); struct irq_desc *desc = irq_desc + irq; Index: linux-2.6.26/arch/arm/mm/copypage-v4mc.c =================================================================== --- linux-2.6.26.orig/arch/arm/mm/copypage-v4mc.c +++ linux-2.6.26/arch/arm/mm/copypage-v4mc.c @@ -44,7 +44,7 @@ static DEFINE_SPINLOCK(minicache_lock); * instruction. If your processor does not supply this, you have to write your * own copy_user_page that does the right thing. */ -static void __attribute__((naked)) +static void notrace __attribute__((naked)) mc_copy_user_page(void *from, void *to) { asm volatile( @@ -88,7 +88,7 @@ void v4_mc_copy_user_page(void *kto, con /* * ARMv4 optimised clear_user_page */ -void __attribute__((naked)) +void notrace __attribute__((naked)) v4_mc_clear_user_page(void *kaddr, unsigned long vaddr) { asm volatile( Index: linux-2.6.26/arch/arm/mm/copypage-xscale.c =================================================================== --- linux-2.6.26.orig/arch/arm/mm/copypage-xscale.c +++ linux-2.6.26/arch/arm/mm/copypage-xscale.c @@ -42,7 +42,7 @@ static DEFINE_SPINLOCK(minicache_lock); * Dcache aliasing issue. The writes will be forwarded to the write buffer, * and merged as appropriate. */ -static void __attribute__((naked)) +static void notrace __attribute__((naked)) mc_copy_user_page(void *from, void *to) { /* @@ -110,7 +110,7 @@ void xscale_mc_copy_user_page(void *kto, /* * XScale optimised clear_user_page */ -void __attribute__((naked)) +void notrace __attribute__((naked)) xscale_mc_clear_user_page(void *kaddr, unsigned long vaddr) { asm volatile( Index: linux-2.6.26/arch/arm/mm/fault.c =================================================================== --- linux-2.6.26.orig/arch/arm/mm/fault.c +++ linux-2.6.26/arch/arm/mm/fault.c @@ -239,7 +239,7 @@ out: return fault; } -static int __kprobes +static int notrace __kprobes do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { struct task_struct *tsk; @@ -338,7 +338,7 @@ no_context: * interrupt or a critical region, and should only copy the information * from the master page table, nothing more. */ -static int __kprobes +static int notrace __kprobes do_translation_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { @@ -381,7 +381,7 @@ bad_area: * Some section permission faults need to be handled gracefully. * They can happen due to a __{get,put}_user during an oops. */ -static int +static notrace int do_sect_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { do_bad_area(addr, fsr, regs); @@ -391,7 +391,7 @@ do_sect_fault(unsigned long addr, unsign /* * This abort handler always returns "fault". */ -static int +static notrace int do_bad(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { return 1; @@ -446,7 +446,7 @@ static struct fsr_info { { do_bad, SIGBUS, 0, "unknown 31" } }; -void __init +void __init notrace hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *), int sig, const char *name) { @@ -460,7 +460,7 @@ hook_fault_code(int nr, int (*fn)(unsign /* * Dispatch a data abort to the relevant handler. */ -asmlinkage void __exception +asmlinkage void __exception notrace do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { const struct fsr_info *inf = fsr_info + (fsr & 15) + ((fsr & (1 << 10)) >> 6); @@ -479,7 +479,7 @@ do_DataAbort(unsigned long addr, unsigne arm_notify_die("", regs, &info, fsr, 0); } -asmlinkage void __exception +asmlinkage void __exception notrace do_PrefetchAbort(unsigned long addr, struct pt_regs *regs) { do_translation_fault(addr, 0, regs); Index: linux-2.6.26/include/asm-arm/pgalloc.h =================================================================== --- linux-2.6.26.orig/include/asm-arm/pgalloc.h +++ linux-2.6.26/include/asm-arm/pgalloc.h @@ -111,7 +111,7 @@ static inline void __pmd_populate(pmd_t * * Ensure that we always set both PMD entries. */ -static inline void +static inline void notrace pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) { unsigned long pte_ptr = (unsigned long)ptep; @@ -124,7 +124,7 @@ pmd_populate_kernel(struct mm_struct *mm __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE); } -static inline void +static inline void notrace pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) { __pmd_populate(pmdp, page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE); Index: linux-2.6.26/include/asm-arm/timex.h =================================================================== --- linux-2.6.26.orig/include/asm-arm/timex.h +++ linux-2.6.26/include/asm-arm/timex.h @@ -16,9 +16,17 @@ typedef unsigned long cycles_t; +#ifndef mach_read_cycles + #define mach_read_cycles() (0) +#ifdef CONFIG_LATENCY_TIMING + #define mach_cycles_to_usecs(d) (d) + #define mach_usecs_to_cycles(d) (d) +#endif +#endif + static inline cycles_t get_cycles (void) { - return 0; + return mach_read_cycles(); } #endif Index: linux-2.6.26/include/asm-arm/unistd.h =================================================================== --- linux-2.6.26.orig/include/asm-arm/unistd.h +++ linux-2.6.26/include/asm-arm/unistd.h @@ -382,6 +382,10 @@ #define __NR_timerfd_settime (__NR_SYSCALL_BASE+353) #define __NR_timerfd_gettime (__NR_SYSCALL_BASE+354) +#ifndef __ASSEMBLY__ +#define NR_syscalls (__NR_fallocate + 1 - __NR_SYSCALL_BASE) +#endif + /* * The following SWIs are ARM private. */ patches/arm-latency-tracer-support.patch0000664000076400007640000000524111043564050017462 0ustar tglxtglxadd latency tracer support for EP93xx boards Add latency tracer support for the EP93xx platform. This is done by: - adding the correct Kconfig options - add (an empty) save_stack_trace implementation. -> Someone needs to implement save_stack_trace for arm :) Maybe we can use the implementation from rmk? - implementing mach_read_cycles (read out EP93XX_TIMER4_VALUE_LOW) - implementing mach_cycles_to_usecs (just the same way as for the PXA platform) - implementing mach_usecs_to_cycles (just the same way as for the PXA platform) Signed-off-by: Jan Altenberg --- arch/arm/Kconfig | 4 ++++ arch/arm/lib/Makefile | 1 + arch/arm/lib/stacktrace.c | 7 +++++++ include/asm-arm/arch-ep93xx/timex.h | 6 ++++++ 4 files changed, 18 insertions(+) Index: linux-2.6.26/arch/arm/Kconfig =================================================================== --- linux-2.6.26.orig/arch/arm/Kconfig +++ linux-2.6.26/arch/arm/Kconfig @@ -44,6 +44,10 @@ config GENERIC_CLOCKEVENTS_BROADCAST depends on GENERIC_CLOCKEVENTS default y if SMP && !LOCAL_TIMERS +config STACKTRACE_SUPPORT + bool + default y + config MMU bool default y Index: linux-2.6.26/arch/arm/lib/Makefile =================================================================== --- linux-2.6.26.orig/arch/arm/lib/Makefile +++ linux-2.6.26/arch/arm/lib/Makefile @@ -41,6 +41,7 @@ lib-$(CONFIG_ARCH_RPC) += ecard.o io-ac lib-$(CONFIG_ARCH_CLPS7500) += io-acorn.o lib-$(CONFIG_ARCH_L7200) += io-acorn.o lib-$(CONFIG_ARCH_SHARK) += io-shark.o +lib-$(CONFIG_STACKTRACE) += stacktrace.o $(obj)/csumpartialcopy.o: $(obj)/csumpartialcopygeneric.S $(obj)/csumpartialcopyuser.o: $(obj)/csumpartialcopygeneric.S Index: linux-2.6.26/arch/arm/lib/stacktrace.c =================================================================== --- /dev/null +++ linux-2.6.26/arch/arm/lib/stacktrace.c @@ -0,0 +1,7 @@ +#include +#include + +void save_stack_trace(struct stack_trace *trace) +{ +} + Index: linux-2.6.26/include/asm-arm/arch-ep93xx/timex.h =================================================================== --- linux-2.6.26.orig/include/asm-arm/arch-ep93xx/timex.h +++ linux-2.6.26/include/asm-arm/arch-ep93xx/timex.h @@ -1,5 +1,11 @@ /* * linux/include/asm-arm/arch-ep93xx/timex.h */ +#include +#include #define CLOCK_TICK_RATE 983040 + +#define mach_read_cycles() __raw_readl(EP93XX_TIMER4_VALUE_LOW) +#define mach_cycles_to_usecs(d) (((d) * ((1000000LL << 32) / CLOCK_TICK_RATE)) >> 32) +#define mach_usecs_to_cycles(d) (((d) * (((long long)CLOCK_TICK_RATE << 32) / 1000000)) >> 32) patches/latency-measurement-drivers.patch0000664000076400007640000004550311043564050017721 0ustar tglxtglx this patch adds: - histogram support to /dev/rtc - the /dev/blocker lock-latency test-device - the /dev/lpptest parallel-port irq latency test-device drivers/char/Kconfig | 40 ++++++++++ drivers/char/Makefile | 2 drivers/char/blocker.c | 109 +++++++++++++++++++++++++++++ drivers/char/lpptest.c | 178 ++++++++++++++++++++++++++++++++++++++++++++++++ drivers/char/rtc.c | 179 ++++++++++++++++++++++++++++++++++++++++++++++++- scripts/Makefile | 3 scripts/testlpp.c | 159 +++++++++++++++++++++++++++++++++++++++++++ 7 files changed, 668 insertions(+), 2 deletions(-) Index: linux-2.6.26/drivers/char/Kconfig =================================================================== --- linux-2.6.26.orig/drivers/char/Kconfig +++ linux-2.6.26/drivers/char/Kconfig @@ -797,6 +797,46 @@ config JS_RTC To compile this driver as a module, choose M here: the module will be called js-rtc. +config RTC_HISTOGRAM + bool "Real Time Clock Histogram Support" + default n + depends on RTC + ---help--- + If you say Y here then the kernel will track the delivery and + wakeup latency of /dev/rtc using tasks and will report a + histogram to the kernel log when the application closes /dev/rtc. + +config BLOCKER + tristate "Priority Inheritance Debugging (Blocker) Device Support" + depends on X86 + default y + ---help--- + If you say Y here then a device will be created that the userspace + pi_test suite uses to test and measure kernel locking primitives. + +config LPPTEST + tristate "Parallel Port Based Latency Measurement Device" + depends on !PARPORT && X86 + default y + ---help--- + If you say Y here then a device will be created that the userspace + testlpp utility uses to measure IRQ latencies of a target system + from an independent measurement system. + + NOTE: this code assumes x86 PCs and that the parallel port is + bidirectional and is on IRQ 7. + + to use the device, both the target and the source system needs to + run a kernel with CONFIG_LPPTEST enabled. To measure latencies, + use the scripts/testlpp utility in your kernel source directory, + and run it (as root) on the source system - it will start printing + out the latencies it took to get a response from the target system: + + Latency of response: 12.2 usecs (121265 cycles) + + then generate various workloads on the target system to see how + (worst-case-) latencies are impacted. + config SGI_DS1286 tristate "SGI DS1286 RTC support" depends on SGI_HAS_DS1286 Index: linux-2.6.26/drivers/char/Makefile =================================================================== --- linux-2.6.26.orig/drivers/char/Makefile +++ linux-2.6.26/drivers/char/Makefile @@ -87,6 +87,8 @@ obj-$(CONFIG_TOSHIBA) += toshiba.o obj-$(CONFIG_I8K) += i8k.o obj-$(CONFIG_DS1620) += ds1620.o obj-$(CONFIG_HW_RANDOM) += hw_random/ +obj-$(CONFIG_BLOCKER) += blocker.o +obj-$(CONFIG_LPPTEST) += lpptest.o obj-$(CONFIG_COBALT_LCD) += lcd.o obj-$(CONFIG_PPDEV) += ppdev.o obj-$(CONFIG_NWBUTTON) += nwbutton.o Index: linux-2.6.26/drivers/char/blocker.c =================================================================== --- /dev/null +++ linux-2.6.26/drivers/char/blocker.c @@ -0,0 +1,109 @@ +/* + * priority inheritance testing device + */ + +#include +#include +#include +#include + +#define BLOCKER_MINOR 221 + +#define BLOCK_IOCTL 4245 +#define BLOCK_SET_DEPTH 4246 + +#define BLOCKER_MAX_LOCK_DEPTH 10 + +void loop(int loops) +{ + int i; + + for (i = 0; i < loops; i++) + get_cycles(); +} + +static spinlock_t blocker_lock[BLOCKER_MAX_LOCK_DEPTH]; + +static unsigned int lock_depth = 1; + +void do_the_lock_and_loop(unsigned int args) +{ + int i, max; + + if (rt_task(current)) + max = lock_depth; + else if (lock_depth > 1) + max = (current->pid % lock_depth) + 1; + else + max = 1; + + /* Always lock from the top down */ + for (i = max-1; i >= 0; i--) + spin_lock(&blocker_lock[i]); + loop(args); + for (i = 0; i < max; i++) + spin_unlock(&blocker_lock[i]); +} + +static int blocker_open(struct inode *in, struct file *file) +{ + printk(KERN_INFO "blocker_open called\n"); + + return 0; +} + +static long blocker_ioctl(struct file *file, + unsigned int cmd, unsigned long args) +{ + switch(cmd) { + case BLOCK_IOCTL: + do_the_lock_and_loop(args); + return 0; + case BLOCK_SET_DEPTH: + if (args >= BLOCKER_MAX_LOCK_DEPTH) + return -EINVAL; + lock_depth = args; + return 0; + default: + return -EINVAL; + } +} + +static struct file_operations blocker_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .unlocked_ioctl = blocker_ioctl, + .open = blocker_open, +}; + +static struct miscdevice blocker_dev = +{ + BLOCKER_MINOR, + "blocker", + &blocker_fops +}; + +static int __init blocker_init(void) +{ + int i; + + if (misc_register(&blocker_dev)) + return -ENODEV; + + for (i = 0; i < BLOCKER_MAX_LOCK_DEPTH; i++) + spin_lock_init(blocker_lock + i); + + return 0; +} + +void __exit blocker_exit(void) +{ + printk(KERN_INFO "blocker device uninstalled\n"); + misc_deregister(&blocker_dev); +} + +module_init(blocker_init); +module_exit(blocker_exit); + +MODULE_LICENSE("GPL"); + Index: linux-2.6.26/drivers/char/lpptest.c =================================================================== --- /dev/null +++ linux-2.6.26/drivers/char/lpptest.c @@ -0,0 +1,178 @@ +/* + * /dev/lpptest device: test IRQ handling latencies over parallel port + * + * Copyright (C) 2005 Thomas Gleixner, Ingo Molnar + * + * licensed under the GPL + * + * You need to have CONFIG_PARPORT disabled for this device, it is a + * completely self-contained device that assumes sole ownership of the + * parallel port. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * API wrappers so that the code can be shared with the -rt tree: + */ +#ifndef local_irq_disable +# define local_irq_disable local_irq_disable +# define local_irq_enable local_irq_enable +#endif + +#ifndef IRQ_NODELAY +# define IRQ_NODELAY 0 +# define IRQF_NODELAY 0 +#endif + +/* + * Driver: + */ +#define LPPTEST_CHAR_MAJOR 245 +#define LPPTEST_DEVICE_NAME "lpptest" + +#define LPPTEST_IRQ 7 + +#define LPPTEST_TEST _IOR (LPPTEST_CHAR_MAJOR, 1, unsigned long long) +#define LPPTEST_DISABLE _IOR (LPPTEST_CHAR_MAJOR, 2, unsigned long long) +#define LPPTEST_ENABLE _IOR (LPPTEST_CHAR_MAJOR, 3, unsigned long long) + +static char dev_id[] = "lpptest"; + +#define INIT_PORT() outb(0x04, 0x37a) +#define ENABLE_IRQ() outb(0x10, 0x37a) +#define DISABLE_IRQ() outb(0, 0x37a) + +static unsigned char out = 0x5a; + +/** + * Interrupt handler. Flip a bit in the reply. + */ +static int lpptest_irq (int irq, void *dev_id) +{ + out ^= 0xff; + outb(out, 0x378); + + return IRQ_HANDLED; +} + +static cycles_t test_response(void) +{ + cycles_t now, end; + unsigned char in; + int timeout = 0; + + local_irq_disable(); + in = inb(0x379); + inb(0x378); + outb(0x08, 0x378); + now = get_cycles(); + while(1) { + if (inb(0x379) != in) + break; + if (timeout++ > 1000000) { + outb(0x00, 0x378); + local_irq_enable(); + + return 0; + } + } + end = get_cycles(); + outb(0x00, 0x378); + local_irq_enable(); + + return end - now; +} + +static int lpptest_open(struct inode *inode, struct file *file) +{ + return 0; +} + +static int lpptest_close(struct inode *inode, struct file *file) +{ + return 0; +} + +int lpptest_ioctl(struct inode *inode, struct file *file, unsigned int ioctl_num, unsigned long ioctl_param) +{ + int retval = 0; + + switch (ioctl_num) { + + case LPPTEST_DISABLE: + DISABLE_IRQ(); + break; + + case LPPTEST_ENABLE: + ENABLE_IRQ(); + break; + + case LPPTEST_TEST: { + + cycles_t diff = test_response(); + if (copy_to_user((void *)ioctl_param, (void*) &diff, sizeof(diff))) + goto errcpy; + break; + } + default: retval = -EINVAL; + } + + return retval; + + errcpy: + return -EFAULT; +} + +static struct file_operations lpptest_dev_fops = { + .ioctl = lpptest_ioctl, + .open = lpptest_open, + .release = lpptest_close, +}; + +static int __init lpptest_init (void) +{ + if (register_chrdev(LPPTEST_CHAR_MAJOR, LPPTEST_DEVICE_NAME, &lpptest_dev_fops)) + { + printk(KERN_NOTICE "Can't allocate major number %d for lpptest.\n", + LPPTEST_CHAR_MAJOR); + return -EAGAIN; + } + + if (request_irq (LPPTEST_IRQ, lpptest_irq, 0, "lpptest", dev_id)) { + printk (KERN_WARNING "lpptest: irq %d in use. Unload parport module!\n", LPPTEST_IRQ); + unregister_chrdev(LPPTEST_CHAR_MAJOR, LPPTEST_DEVICE_NAME); + return -EAGAIN; + } + irq_desc[LPPTEST_IRQ].status |= IRQ_NODELAY; + irq_desc[LPPTEST_IRQ].action->flags |= IRQF_NODELAY | IRQF_DISABLED; + + INIT_PORT(); + ENABLE_IRQ(); + + return 0; +} +module_init (lpptest_init); + +static void __exit lpptest_exit (void) +{ + DISABLE_IRQ(); + + free_irq(LPPTEST_IRQ, dev_id); + unregister_chrdev(LPPTEST_CHAR_MAJOR, LPPTEST_DEVICE_NAME); +} +module_exit (lpptest_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("lpp test module"); + Index: linux-2.6.26/drivers/char/rtc.c =================================================================== --- linux-2.6.26.orig/drivers/char/rtc.c +++ linux-2.6.26/drivers/char/rtc.c @@ -95,6 +95,32 @@ static unsigned long rtc_port; static int rtc_irq = PCI_IRQ_NONE; #endif +#ifdef CONFIG_MIPS +# include +#endif + +#ifdef CONFIG_RTC_HISTOGRAM + +static cycles_t last_interrupt_time; + +#include + +#define CPU_MHZ (cpu_khz / 1000) + +#define HISTSIZE 10000 +static int histogram[HISTSIZE]; + +static int rtc_state; + +enum rtc_states { + S_STARTUP, /* First round - let the application start */ + S_IDLE, /* Waiting for an interrupt */ + S_WAITING_FOR_READ, /* Signal delivered. waiting for rtc_read() */ + S_READ_MISSED, /* Signal delivered, read() deadline missed */ +}; + +#endif + #ifdef CONFIG_HPET_RTC_IRQ #undef RTC_IRQ #endif @@ -225,7 +251,146 @@ static inline unsigned char rtc_is_updat return uip; } +#ifndef RTC_IRQ +# undef CONFIG_RTC_HISTOGRAM +#endif + +static inline void rtc_open_event(void) +{ +#ifdef CONFIG_RTC_HISTOGRAM + int i; + + last_interrupt_time = 0; + rtc_state = S_STARTUP; + rtc_irq_data = 0; + + for (i = 0; i < HISTSIZE; i++) + histogram[i] = 0; +#endif +} + +static inline void rtc_wake_event(void) +{ +#ifndef CONFIG_RTC_HISTOGRAM + kill_fasync (&rtc_async_queue, SIGIO, POLL_IN); +#else + if (!(rtc_status & RTC_IS_OPEN)) + return; + + switch (rtc_state) { + /* Startup */ + case S_STARTUP: + kill_fasync (&rtc_async_queue, SIGIO, POLL_IN); + break; + /* Waiting for an interrupt */ + case S_IDLE: + kill_fasync (&rtc_async_queue, SIGIO, POLL_IN); + last_interrupt_time = get_cycles(); + rtc_state = S_WAITING_FOR_READ; + break; + + /* Signal has been delivered. waiting for rtc_read() */ + case S_WAITING_FOR_READ: + /* + * Well foo. The usermode application didn't + * schedule and read in time. + */ + last_interrupt_time = get_cycles(); + rtc_state = S_READ_MISSED; + printk("Read missed before next interrupt\n"); + break; + /* Signal has been delivered, read() deadline was missed */ + case S_READ_MISSED: + /* + * Not much we can do here. We're waiting for the usermode + * application to read the rtc + */ + last_interrupt_time = get_cycles(); + break; + } +#endif +} + +static inline void rtc_read_event(void) +{ +#ifdef CONFIG_RTC_HISTOGRAM + cycles_t now = get_cycles(); + + switch (rtc_state) { + /* Startup */ + case S_STARTUP: + rtc_state = S_IDLE; + break; + + /* Waiting for an interrupt */ + case S_IDLE: + printk("bug in rtc_read(): called in state S_IDLE!\n"); + break; + case S_WAITING_FOR_READ: /* + * Signal has been delivered. + * waiting for rtc_read() + */ + /* + * Well done + */ + case S_READ_MISSED: /* + * Signal has been delivered, read() + * deadline was missed + */ + /* + * So, you finally got here. + */ + if (!last_interrupt_time) + printk("bug in rtc_read(): last_interrupt_time = 0\n"); + rtc_state = S_IDLE; + { + cycles_t latency = now - last_interrupt_time; + unsigned long delta; /* Microseconds */ + + delta = latency; + delta /= CPU_MHZ; + + if (delta > 1000 * 1000) { + printk("rtc: eek\n"); + } else { + unsigned long slot = delta; + if (slot >= HISTSIZE) + slot = HISTSIZE - 1; + histogram[slot]++; + if (delta > 2000) + printk("wow! That was a " + "%ld millisec bump\n", + delta / 1000); + } + } + rtc_state = S_IDLE; + break; + } +#endif +} + +static inline void rtc_close_event(void) +{ +#ifdef CONFIG_RTC_HISTOGRAM + int i = 0; + unsigned long total = 0; + + for (i = 0; i < HISTSIZE; i++) + total += histogram[i]; + if (!total) + return; + + printk("\nrtc latency histogram of {%s/%d, %lu samples}:\n", + current->comm, current->pid, total); + for (i = 0; i < HISTSIZE; i++) { + if (histogram[i]) + printk("%d %d\n", i, histogram[i]); + } +#endif +} + #ifdef RTC_IRQ + /* * A very tiny interrupt handler. It runs with IRQF_DISABLED set, * but there is possibility of conflicting with the set_rtc_mmss() @@ -269,9 +434,9 @@ irqreturn_t rtc_interrupt(int irq, void if (rtc_callback) rtc_callback->func(rtc_callback->private_data); spin_unlock(&rtc_task_lock); - wake_up_interruptible(&rtc_wait); - kill_fasync(&rtc_async_queue, SIGIO, POLL_IN); + rtc_wake_event(); + wake_up_interruptible(&rtc_wait); return IRQ_HANDLED; } @@ -381,6 +546,8 @@ static ssize_t rtc_read(struct file *fil schedule(); } while (1); + rtc_read_event(); + if (count == sizeof(unsigned int)) { retval = put_user(data, (unsigned int __user *)buf) ?: sizeof(int); @@ -628,6 +795,11 @@ static int rtc_do_ioctl(unsigned int cmd save_freq_select = CMOS_READ(RTC_FREQ_SELECT); CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); + /* + * Make CMOS date writes nonpreemptible even on PREEMPT_RT. + * There's a limit to everything! =B-) + */ + preempt_disable(); #ifdef CONFIG_MACH_DECSTATION CMOS_WRITE(real_yrs, RTC_DEC_YEAR); #endif @@ -637,6 +809,7 @@ static int rtc_do_ioctl(unsigned int cmd CMOS_WRITE(hrs, RTC_HOURS); CMOS_WRITE(min, RTC_MINUTES); CMOS_WRITE(sec, RTC_SECONDS); + preempt_enable(); CMOS_WRITE(save_control, RTC_CONTROL); CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); @@ -739,6 +912,7 @@ static int rtc_open(struct inode *inode, if (rtc_status & RTC_IS_OPEN) goto out_busy; + rtc_open_event(); rtc_status |= RTC_IS_OPEN; rtc_irq_data = 0; @@ -792,6 +966,7 @@ no_irq: rtc_irq_data = 0; rtc_status &= ~RTC_IS_OPEN; spin_unlock_irq(&rtc_lock); + rtc_close_event(); return 0; } Index: linux-2.6.26/scripts/Makefile =================================================================== --- linux-2.6.26.orig/scripts/Makefile +++ linux-2.6.26/scripts/Makefile @@ -12,6 +12,9 @@ hostprogs-$(CONFIG_LOGO) += pnmt hostprogs-$(CONFIG_VT) += conmakehash hostprogs-$(CONFIG_PROM_CONSOLE) += conmakehash hostprogs-$(CONFIG_IKCONFIG) += bin2c +ifdef CONFIG_LPPTEST +hostprogs-y += testlpp +endif always := $(hostprogs-y) $(hostprogs-m) Index: linux-2.6.26/scripts/testlpp.c =================================================================== --- /dev/null +++ linux-2.6.26/scripts/testlpp.c @@ -0,0 +1,159 @@ +/* + * testlpp.c: use the /dev/lpptest device to test IRQ handling + * latencies over parallel port + * + * Copyright (C) 2005 Thomas Gleixner + * + * licensed under the GPL + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define LPPTEST_CHAR_MAJOR 245 +#define LPPTEST_DEVICE_NAME "lpptest" + +#define LPPTEST_TEST _IOR (LPPTEST_CHAR_MAJOR, 1, unsigned long long) +#define LPPTEST_DISABLE _IOR (LPPTEST_CHAR_MAJOR, 2, unsigned long long) +#define LPPTEST_ENABLE _IOR (LPPTEST_CHAR_MAJOR, 3, unsigned long long) + +#define HIST_SIZE 10000 + +static int hist_total; +static unsigned long hist[HIST_SIZE]; + +static void hist_hit(unsigned long usecs) +{ + hist_total++; + if (usecs >= HIST_SIZE-1) + hist[HIST_SIZE-1]++; + else + hist[usecs]++; +} + +static void print_hist(void) +{ + int i; + + printf("LPP latency histogram:\n"); + + for (i = 0; i < HIST_SIZE; i++) { + if (hist[i]) + printf("%3d usecs: %9ld\n", i, hist[i]); + } +} + +static inline unsigned long long int rdtsc(void) +{ + unsigned long long int x, y; + for (;;) { + __asm__ volatile ("rdtsc" : "=A" (x)); + __asm__ volatile ("rdtsc" : "=A" (y)); + if (y - x < 1000) + return y; + } +} + +static unsigned long long calibrate_loop(void) +{ + unsigned long long mytime1, mytime2; + + mytime1 = rdtsc(); + usleep(500000); + mytime2 = rdtsc(); + + return (mytime2 - mytime1) * 2; +} + +#define time_to_usecs(time) ((double)time*1000000.0/(double)cycles_per_sec) + +#define time_to_usecs_l(time) (long)(time*1000000/cycles_per_sec) + +int fd, total; +unsigned long long tim, sum_tim, min_tim = -1ULL, max_tim, cycles_per_sec; + +void cleanup(int sig) +{ + ioctl (fd, LPPTEST_ENABLE, &tim); + if (sig) + printf("[ interrupted - exiting ]\n"); + printf("\ntotal number of responses: %d\n", total); + printf("average reponse latency: %.2lf usecs\n", + time_to_usecs(sum_tim/total)); + printf("minimum latency: %.2lf usecs\n", + time_to_usecs(min_tim)); + printf("maximum latency: %.2lf usecs\n", + time_to_usecs(max_tim)); + print_hist(); + exit(0); +} + +#define HZ 3000 + +int main (int argc, char **argv) +{ + unsigned int nr_requests = 0; + + if (argc > 2) { + fprintf(stderr, "usage: testlpp []\n"); + exit(-1); + } + if (argc == 2) + nr_requests = atol(argv[1]); + + if (getuid() != 0) { + fprintf(stderr, "need to run as root!\n"); + exit(-1); + } + mknod("/dev/lpptest", S_IFCHR|0666, makedev(245, 1)); + + fd = open("/dev/lpptest", O_RDWR); + if (fd == -1) { + fprintf(stderr, "could not open /dev/lpptest, your kernel doesnt have CONFIG_LPPTEST enabled?\n"); + exit(-1); + } + + signal(SIGINT,&cleanup); + + ioctl (fd, LPPTEST_DISABLE, &tim); + + fprintf(stderr, "calibrating cycles to usecs: "); + cycles_per_sec = calibrate_loop(); + fprintf(stderr, "%lld cycles per usec\n", cycles_per_sec/1000000); + if (nr_requests) + fprintf(stderr, "[max # of requests: %u]\n", nr_requests); + fprintf(stderr, "starting %dHz test, hit Ctrl-C to stop:\n\n", HZ); + + while(1) { + ioctl (fd, LPPTEST_TEST, &tim); + if (tim == 0) + printf ("No response from target.\n"); + else { + hist_hit(time_to_usecs_l(tim)); + if (tim > max_tim) { + printf ("new max latency: %.2lf usecs (%Ld cycles)\n", time_to_usecs(tim), tim); + max_tim = tim; + } + if (tim < min_tim) + min_tim = tim; + total++; + if (total == nr_requests) + break; + sum_tim += tim; + } + usleep(1000000/HZ); + } + cleanup(0); + + return 0; +} + + patches/lockdep-show-held-locks.patch0000664000076400007640000000405511043564050016702 0ustar tglxtglxSubject: [patch] lockdep: show held locks when showing a stackdump From: Ingo Molnar show held locks when printing a backtrace. Signed-off-by: Ingo Molnar --- arch/x86/kernel/traps_32.c | 1 + arch/x86/kernel/traps_64.c | 1 + kernel/lockdep.c | 8 +++++++- 3 files changed, 9 insertions(+), 1 deletion(-) Index: linux-2.6.26/arch/x86/kernel/traps_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/traps_32.c +++ linux-2.6.26/arch/x86/kernel/traps_32.c @@ -262,6 +262,7 @@ show_trace_log_lvl(struct task_struct *t dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl); printk("%s =======================\n", log_lvl); print_preempt_trace(task); + debug_show_held_locks(task); } void show_trace(struct task_struct *task, struct pt_regs *regs, Index: linux-2.6.26/arch/x86/kernel/traps_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/traps_64.c +++ linux-2.6.26/arch/x86/kernel/traps_64.c @@ -389,6 +389,7 @@ show_trace(struct task_struct *tsk, stru printk("\nCall Trace:\n"); dump_trace(tsk, regs, stack, bp, &print_trace_ops, NULL); printk("\n"); + debug_show_held_locks(tsk); print_preempt_trace(tsk); } Index: linux-2.6.26/kernel/lockdep.c =================================================================== --- linux-2.6.26.orig/kernel/lockdep.c +++ linux-2.6.26/kernel/lockdep.c @@ -512,7 +512,11 @@ static void print_lock(struct held_lock static void lockdep_print_held_locks(struct task_struct *curr) { - int i, depth = curr->lockdep_depth; + int i, depth; + + if (!curr) + curr = current; + depth = curr->lockdep_depth; if (!depth) { printk("no locks held by %s/%d.\n", curr->comm, task_pid_nr(curr)); @@ -3235,6 +3239,8 @@ void __debug_show_held_locks(struct task printk("INFO: lockdep is turned off.\n"); return; } + if (task == current) + lockdep_print_held_locks(task); lockdep_print_held_locks(task); } EXPORT_SYMBOL_GPL(__debug_show_held_locks); patches/lockdep-lock_set_subclass.patch0000664000076400007640000000716511043564050017406 0ustar tglxtglxSubject: [patch] lockdep: lock_set_subclass - reset a held lock's subclass From: Peter Zijlstra this can be used to reset a held lock's subclass, for arbitrary-depth iterated data structures such as trees or lists which have per-node locks. Signed-off-by: Peter Zijlstra Signed-off-by: Ingo Molnar --- include/linux/lockdep.h | 4 ++ kernel/lockdep.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 73 insertions(+) Index: linux-2.6.26/include/linux/lockdep.h =================================================================== --- linux-2.6.26.orig/include/linux/lockdep.h +++ linux-2.6.26/include/linux/lockdep.h @@ -304,6 +304,9 @@ extern void lock_acquire(struct lockdep_ extern void lock_release(struct lockdep_map *lock, int nested, unsigned long ip); +extern void lock_set_subclass(struct lockdep_map *lock, unsigned int subclass, + unsigned long ip); + # define INIT_LOCKDEP .lockdep_recursion = 0, #define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0) @@ -320,6 +323,7 @@ static inline void lockdep_on(void) # define lock_acquire(l, s, t, r, c, i) do { } while (0) # define lock_release(l, n, i) do { } while (0) +# define lock_set_subclass(l, s, i) do { } while (0) # define lockdep_init() do { } while (0) # define lockdep_info() do { } while (0) # define lockdep_init_map(lock, name, key, sub) do { (void)(key); } while (0) Index: linux-2.6.26/kernel/lockdep.c =================================================================== --- linux-2.6.26.orig/kernel/lockdep.c +++ linux-2.6.26/kernel/lockdep.c @@ -2540,6 +2540,55 @@ static int check_unlock(struct task_stru return 1; } +static int +__lock_set_subclass(struct lockdep_map *lock, + unsigned int subclass, unsigned long ip) +{ + struct task_struct *curr = current; + struct held_lock *hlock, *prev_hlock; + struct lock_class *class; + unsigned int depth; + int i; + + depth = curr->lockdep_depth; + if (DEBUG_LOCKS_WARN_ON(!depth)) + return 0; + + prev_hlock = NULL; + for (i = depth-1; i >= 0; i--) { + hlock = curr->held_locks + i; + /* + * We must not cross into another context: + */ + if (prev_hlock && prev_hlock->irq_context != hlock->irq_context) + break; + if (hlock->instance == lock) + goto found_it; + prev_hlock = hlock; + } + return print_unlock_inbalance_bug(curr, lock, ip); + +found_it: + class = register_lock_class(lock, subclass, 0); + hlock->class = class; + + curr->lockdep_depth = i; + curr->curr_chain_key = hlock->prev_chain_key; + + for (; i < depth; i++) { + hlock = curr->held_locks + i; + if (!__lock_acquire(hlock->instance, + hlock->class->subclass, hlock->trylock, + hlock->read, hlock->check, hlock->hardirqs_off, + hlock->acquire_ip)) + return 0; + } + + if (DEBUG_LOCKS_WARN_ON(curr->lockdep_depth != depth)) + return 0; + return 1; +} + /* * Remove the lock to the list of currently held locks in a * potentially non-nested (out of order) manner. This is a @@ -2703,6 +2752,26 @@ static void check_flags(unsigned long fl #endif } +void +lock_set_subclass(struct lockdep_map *lock, + unsigned int subclass, unsigned long ip) +{ + unsigned long flags; + + if (unlikely(current->lockdep_recursion)) + return; + + raw_local_irq_save(flags); + current->lockdep_recursion = 1; + check_flags(flags); + if (__lock_set_subclass(lock, subclass, ip)) + check_chain_key(current); + current->lockdep_recursion = 0; + raw_local_irq_restore(flags); +} + +EXPORT_SYMBOL_GPL(lock_set_subclass); + /* * We are not always called with irqs disabled - do that here, * and also avoid lockdep recursion: patches/lockdep-prettify.patch0000664000076400007640000000364311043564050015547 0ustar tglxtglxSubject: [patch] lockdep: prettify output From: Ingo Molnar recent changes to the lockdep code made some of the printouts uglier - mend them. Signed-off-by: Ingo Molnar --- kernel/lockdep.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) Index: linux-2.6.26/kernel/lockdep.c =================================================================== --- linux-2.6.26.orig/kernel/lockdep.c +++ linux-2.6.26/kernel/lockdep.c @@ -581,7 +581,7 @@ static void print_lock_dependencies(stru static void print_kernel_version(void) { - printk("%s %.*s\n", init_utsname()->release, + printk("[ %s %.*s\n", init_utsname()->release, (int)strcspn(init_utsname()->version, " "), init_utsname()->version); } @@ -3131,13 +3131,13 @@ void __init lockdep_info(void) { printk("Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar\n"); - printk("... MAX_LOCKDEP_SUBCLASSES: %lu\n", MAX_LOCKDEP_SUBCLASSES); - printk("... MAX_LOCK_DEPTH: %lu\n", MAX_LOCK_DEPTH); - printk("... MAX_LOCKDEP_KEYS: %lu\n", MAX_LOCKDEP_KEYS); - printk("... CLASSHASH_SIZE: %lu\n", CLASSHASH_SIZE); - printk("... MAX_LOCKDEP_ENTRIES: %lu\n", MAX_LOCKDEP_ENTRIES); - printk("... MAX_LOCKDEP_CHAINS: %lu\n", MAX_LOCKDEP_CHAINS); - printk("... CHAINHASH_SIZE: %lu\n", CHAINHASH_SIZE); + printk("... MAX_LOCKDEP_SUBCLASSES: %6lu\n", MAX_LOCKDEP_SUBCLASSES); + printk("... MAX_LOCK_DEPTH: %6lu\n", MAX_LOCK_DEPTH); + printk("... MAX_LOCKDEP_KEYS: %6lu\n", MAX_LOCKDEP_KEYS); + printk("... CLASSHASH_SIZE: %6lu\n", CLASSHASH_SIZE); + printk("... MAX_LOCKDEP_ENTRIES: %6lu\n", MAX_LOCKDEP_ENTRIES); + printk("... MAX_LOCKDEP_CHAINS: %6lu\n", MAX_LOCKDEP_CHAINS); + printk("... CHAINHASH_SIZE: %6lu\n", CHAINHASH_SIZE); printk(" memory used by lock dependency info: %lu kB\n", (sizeof(struct lock_class) * MAX_LOCKDEP_KEYS + patches/lockdep-more-entries.patch0000664000076400007640000000133111043564047016310 0ustar tglxtglx--- kernel/lockdep_internals.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6.26/kernel/lockdep_internals.h =================================================================== --- linux-2.6.26.orig/kernel/lockdep_internals.h +++ linux-2.6.26/kernel/lockdep_internals.h @@ -15,12 +15,12 @@ * table (if it's not there yet), and we check it for lock order * conflicts and deadlocks. */ -#define MAX_LOCKDEP_ENTRIES 8192UL +#define MAX_LOCKDEP_ENTRIES 16384UL #define MAX_LOCKDEP_KEYS_BITS 11 #define MAX_LOCKDEP_KEYS (1UL << MAX_LOCKDEP_KEYS_BITS) -#define MAX_LOCKDEP_CHAINS_BITS 14 +#define MAX_LOCKDEP_CHAINS_BITS 15 #define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS) /* patches/loopback-revert.patch0000664000076400007640000000226211043564047015363 0ustar tglxtglx revert this commit: commit 58f539740b1ccfc5ef4e509ec2efe82621b546e3 Author: Eric Dumazet Date: Fri Oct 20 00:32:41 2006 -0700 [NET]: Can use __get_cpu_var() instead of per_cpu() in loopback driver. As BHs are off in loopback_xmit(), preemption cannot occurs, so we can use __get_cpu_var() instead of per_cpu() (and avoid a preempt_enable()/preempt_disable() pair) Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- drivers/net/loopback.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6.26/drivers/net/loopback.c =================================================================== --- linux-2.6.26.orig/drivers/net/loopback.c +++ linux-2.6.26/drivers/net/loopback.c @@ -152,11 +152,11 @@ static int loopback_xmit(struct sk_buff #endif dev->last_rx = jiffies; - /* it's OK to use per_cpu_ptr() because BHs are off */ pcpu_lstats = netdev_priv(dev); - lb_stats = per_cpu_ptr(pcpu_lstats, smp_processor_id()); + lb_stats = per_cpu_ptr(pcpu_lstats, get_cpu()); lb_stats->bytes += skb->len; lb_stats->packets++; + put_cpu(); netif_rx(skb); patches/arm-futex-atomic-cmpxchg.patch0000664000076400007640000001026311043564047017075 0ustar tglxtglxImplement futex macros for ARM Signed-off-by: Khem Raj Signed-off-by: Nicolas Pitre Signed-off-by: George Davis arch/arm/kernel/process.c | 2 include/asm-arm/futex.h | 125 ++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 124 insertions(+), 3 deletions(-) Index: linux-2.6.26/arch/arm/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/process.c +++ linux-2.6.26/arch/arm/kernel/process.c @@ -36,6 +36,8 @@ #include #include +DEFINE_SPINLOCK(futex_atomic_lock); + static const char *processor_modes[] = { "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" , "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26", Index: linux-2.6.26/include/asm-arm/futex.h =================================================================== --- linux-2.6.26.orig/include/asm-arm/futex.h +++ linux-2.6.26/include/asm-arm/futex.h @@ -1,6 +1,125 @@ -#ifndef _ASM_FUTEX_H -#define _ASM_FUTEX_H +#ifndef _ASM_ARM_FUTEX_H +#define _ASM_ARM_FUTEX_H -#include +#ifdef __KERNEL__ +#include +#include +#include + +extern spinlock_t futex_atomic_lock; + +#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ + __asm__ __volatile__ ( \ + "1: ldrt %1, [%2] \n" \ + insn \ + "2: strt %0, [%2] \n" \ + " mov %0, #0 \n" \ + "3: \n" \ + " .section __ex_table, \"a\" \n" \ + " .align 3 \n" \ + " .long 1b, 4f, 2b, 4f \n" \ + " .previous \n" \ + " .section .fixup,\"ax\" \n" \ + "4: mov %0, %4 \n" \ + " b 3b \n" \ + " .previous" \ + : "=&r" (ret), "=&r" (oldval) \ + : "r" (uaddr), "r" (oparg), "Ir" (-EFAULT) \ + : "cc", "memory") + +static inline int +futex_atomic_op_inuser (int encoded_op, int __user *uaddr) +{ + int op = (encoded_op >> 28) & 7; + int cmp = (encoded_op >> 24) & 15; + int oparg = (encoded_op << 8) >> 20; + int cmparg = (encoded_op << 20) >> 20; + int oldval = 0, ret; + if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) + oparg = 1 << oparg; + + if (!access_ok (VERIFY_WRITE, uaddr, sizeof(int))) + return -EFAULT; + + pagefault_disable(); + + spin_lock(&futex_atomic_lock); + + switch (op) { + case FUTEX_OP_SET: + __futex_atomic_op(" mov %0, %3\n", + ret, oldval, uaddr, oparg); + break; + case FUTEX_OP_ADD: + __futex_atomic_op(" add %0, %1, %3\n", + ret, oldval, uaddr, oparg); + break; + case FUTEX_OP_OR: + __futex_atomic_op(" orr %0, %1, %3\n", + ret, oldval, uaddr, oparg); + break; + case FUTEX_OP_ANDN: + __futex_atomic_op(" and %0, %1, %3\n", + ret, oldval, uaddr, oparg); + break; + case FUTEX_OP_XOR: + __futex_atomic_op(" eor %0, %1, %3\n", + ret, oldval, uaddr, oparg); + break; + default: + ret = -ENOSYS; + } + + spin_unlock(&futex_atomic_lock); + + pagefault_enable(); + + if (!ret) { + switch (cmp) { + case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; + case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; + case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; + case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; + case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; + case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; + default: ret = -ENOSYS; + } + } + return ret; +} + +static inline int +futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) +{ + int val; + + if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) + return -EFAULT; + + spin_lock(&futex_atomic_lock); + + __asm__ __volatile__( "@futex_atomic_cmpxchg_inatomic \n" + "1: ldrt %0, [%3] \n" + " teq %0, %1 \n" + "2: streqt %2, [%3] \n" + "3: \n" + " .section __ex_table, \"a\" \n" + " .align 3 \n" + " .long 1b, 4f, 2b, 4f \n" + " .previous \n" + " .section .fixup,\"ax\" \n" + "4: mov %0, %4 \n" + " b 3b \n" + " .previous" + : "=&r" (val) + : "r" (oldval), "r" (newval), "r" (uaddr), "Ir" (-EFAULT) + : "cc"); + + spin_unlock(&futex_atomic_lock); + + return val; +} + +#endif #endif patches/arm-preempt-config.patch0000664000076400007640000000177011043564046015762 0ustar tglxtglx arch/arm/Kconfig | 13 +------------ 1 file changed, 1 insertion(+), 12 deletions(-) Index: linux-2.6.26/arch/arm/Kconfig =================================================================== --- linux-2.6.26.orig/arch/arm/Kconfig +++ linux-2.6.26/arch/arm/Kconfig @@ -696,18 +696,7 @@ config LOCAL_TIMERS accounting to be spread across the timer interval, preventing a "thundering herd" at every timer tick. -config PREEMPT - bool "Preemptible Kernel (EXPERIMENTAL)" - depends on EXPERIMENTAL - help - This option reduces the latency of the kernel when reacting to - real-time or interactive events by allowing a low priority process to - be preempted even if it is in kernel mode executing a system call. - This allows applications to run more reliably even when the system is - under load. - - Say Y here if you are building a kernel for a desktop, embedded - or real-time system. Say N if you are unsure. +source kernel/Kconfig.preempt config NO_IDLE_HZ bool "Dynamic tick timer" patches/m68knommu-make-cmpxchg-RT-safe.patch0000664000076400007640000000253411043702654017726 0ustar tglxtglxFrom fb918e8b87e699c8174d8f7fbff1ab558c7389b0 Mon Sep 17 00:00:00 2001 From: Sebastian Siewior Date: Fri, 18 Apr 2008 17:02:29 +0200 Subject: [PATCH] m68knommu: make cmpxchg RT-safe Signed-off-by: Sebastian Siewior Signed-off-by: Thomas Gleixner --- include/asm-m68knommu/system.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) Index: linux-2.6.26/include/asm-m68knommu/system.h =================================================================== --- linux-2.6.26.orig/include/asm-m68knommu/system.h +++ linux-2.6.26/include/asm-m68knommu/system.h @@ -2,9 +2,10 @@ #define _M68KNOMMU_SYSTEM_H #include +#include +#include #include #include - /* * switch_to(n) should switch tasks to task ptr, first checking that * ptr isn't the current task, in which case it does nothing. This @@ -130,7 +131,7 @@ static inline unsigned long __xchg(unsig { unsigned long tmp, flags; - local_irq_save(flags); + raw_local_irq_save(flags); switch (size) { case 1: @@ -152,7 +153,7 @@ static inline unsigned long __xchg(unsig : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); break; } - local_irq_restore(flags); + raw_local_irq_restore(flags); return tmp; } #else patches/generic-cmpxchg-use-raw-local-irq-variant.patch0000664000076400007640000000206411043704002022216 0ustar tglxtglx--- include/asm-generic/cmpxchg-local.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) Index: linux-2.6.26/include/asm-generic/cmpxchg-local.h =================================================================== --- linux-2.6.26.orig/include/asm-generic/cmpxchg-local.h +++ linux-2.6.26/include/asm-generic/cmpxchg-local.h @@ -20,7 +20,7 @@ static inline unsigned long __cmpxchg_lo if (size == 8 && sizeof(unsigned long) != 8) wrong_size_cmpxchg(ptr); - local_irq_save(flags); + raw_local_irq_save(flags); switch (size) { case 1: prev = *(u8 *)ptr; if (prev == old) @@ -41,7 +41,7 @@ static inline unsigned long __cmpxchg_lo default: wrong_size_cmpxchg(ptr); } - local_irq_restore(flags); + raw_local_irq_restore(flags); return prev; } @@ -54,11 +54,11 @@ static inline u64 __cmpxchg64_local_gene u64 prev; unsigned long flags; - local_irq_save(flags); + raw_local_irq_save(flags); prev = *(u64 *)ptr; if (prev == old) *(u64 *)ptr = new; - local_irq_restore(flags); + raw_local_irq_restore(flags); return prev; } patches/preempt-softirqs-core.patch0000664000076400007640000004334711043564046016546 0ustar tglxtglx--- include/linux/bottom_half.h | 1 include/linux/interrupt.h | 13 +- include/linux/sched.h | 15 ++ kernel/Kconfig.preempt | 17 ++ kernel/sched.c | 28 +++- kernel/softirq.c | 277 +++++++++++++++++++++++++++++++++----------- 6 files changed, 283 insertions(+), 68 deletions(-) Index: linux-2.6.26/include/linux/bottom_half.h =================================================================== --- linux-2.6.26.orig/include/linux/bottom_half.h +++ linux-2.6.26/include/linux/bottom_half.h @@ -2,7 +2,6 @@ #define _LINUX_BH_H extern void local_bh_disable(void); -extern void __local_bh_enable(void); extern void _local_bh_enable(void); extern void local_bh_enable(void); extern void local_bh_enable_ip(unsigned long ip); Index: linux-2.6.26/include/linux/interrupt.h =================================================================== --- linux-2.6.26.orig/include/linux/interrupt.h +++ linux-2.6.26/include/linux/interrupt.h @@ -276,6 +276,8 @@ enum HRTIMER_SOFTIRQ, #endif RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ + /* Entries after this are ignored in split softirq mode */ + MAX_SOFTIRQ, }; /* softirq mask and active fields moved to irq_cpustat_t in @@ -288,14 +290,22 @@ struct softirq_action void *data; }; +#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0) +#define __do_raise_softirq_irqoff(nr) __raise_softirq_irqoff(nr) + asmlinkage void do_softirq(void); asmlinkage void __do_softirq(void); extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data); extern void softirq_init(void); -#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0) extern void raise_softirq_irqoff(unsigned int nr); extern void raise_softirq(unsigned int nr); +extern void wakeup_irqd(void); +#ifdef CONFIG_PREEMPT_SOFTIRQS +extern void wait_for_softirq(int softirq); +#else +# define wait_for_softirq(x) do {} while(0) +#endif /* Tasklets --- multithreaded analogue of BHs. @@ -407,6 +417,7 @@ extern void tasklet_kill(struct tasklet_ extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); extern void tasklet_init(struct tasklet_struct *t, void (*func)(unsigned long), unsigned long data); +void takeover_tasklets(unsigned int cpu); /* * Autoprobing for irqs: Index: linux-2.6.26/include/linux/sched.h =================================================================== --- linux-2.6.26.orig/include/linux/sched.h +++ linux-2.6.26/include/linux/sched.h @@ -90,6 +90,12 @@ struct sched_param { #include +#ifdef CONFIG_PREEMPT_SOFTIRQS +extern int softirq_preemption; +#else +# define softirq_preemption 0 +#endif + struct mem_cgroup; struct exec_domain; struct futex_pi_state; @@ -1536,6 +1542,7 @@ static inline void put_task_struct(struc #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ +#define PF_SOFTIRQ 0x04000000 /* softirq context */ #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ @@ -2106,6 +2113,7 @@ static inline int cond_resched_bkl(void) { return _cond_resched(); } +extern int cond_resched_softirq_context(void); /* * Does a critical section need to be broken due to another @@ -2121,6 +2129,13 @@ static inline int spin_needbreak(spinloc #endif } +static inline int softirq_need_resched(void) +{ + if (softirq_preemption && (current->flags & PF_SOFTIRQ)) + return need_resched(); + return 0; +} + /* * Reevaluate whether the task has signals pending delivery. * Wake the task if so. Index: linux-2.6.26/kernel/Kconfig.preempt =================================================================== --- linux-2.6.26.orig/kernel/Kconfig.preempt +++ linux-2.6.26/kernel/Kconfig.preempt @@ -91,3 +91,20 @@ config RCU_TRACE Say Y here if you want to enable RCU tracing Say N if you are unsure. + +config PREEMPT_SOFTIRQS + bool "Thread Softirqs" + default n +# depends on PREEMPT + help + This option reduces the latency of the kernel by 'threading' + soft interrupts. This means that all softirqs will execute + in softirqd's context. While this helps latency, it can also + reduce performance. + + The threading of softirqs can also be controlled via + /proc/sys/kernel/softirq_preemption runtime flag and the + sofirq-preempt=0/1 boot-time option. + + Say N if you are unsure. + Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -4001,7 +4001,7 @@ void account_system_time(struct task_str tmp = cputime_to_cputime64(cputime); if (hardirq_count() - hardirq_offset) cpustat->irq = cputime64_add(cpustat->irq, tmp); - else if (softirq_count()) + else if (softirq_count() || (p->flags & PF_SOFTIRQ)) cpustat->softirq = cputime64_add(cpustat->softirq, tmp); else if (p != rq->idle) cpustat->system = cputime64_add(cpustat->system, tmp); @@ -4357,7 +4357,7 @@ asmlinkage void __sched preempt_schedule int saved_lock_depth; /* Catch callers which need to be fixed */ - BUG_ON(ti->preempt_count || !irqs_disabled()); + WARN_ON_ONCE(ti->preempt_count || !irqs_disabled()); do { add_preempt_count(PREEMPT_ACTIVE); @@ -5327,9 +5327,12 @@ int cond_resched_lock(spinlock_t *lock) } EXPORT_SYMBOL(cond_resched_lock); +/* + * Voluntarily preempt a process context that has softirqs disabled: + */ int __sched cond_resched_softirq(void) { - BUG_ON(!in_softirq()); + WARN_ON_ONCE(!in_softirq()); if (need_resched() && system_state == SYSTEM_RUNNING) { local_bh_enable(); @@ -5341,6 +5344,25 @@ int __sched cond_resched_softirq(void) } EXPORT_SYMBOL(cond_resched_softirq); +/* + * Voluntarily preempt a softirq context (possible with softirq threading): + */ +int __sched cond_resched_softirq_context(void) +{ + WARN_ON_ONCE(!in_softirq()); + + if (softirq_need_resched() && system_state == SYSTEM_RUNNING) { + raw_local_irq_disable(); + _local_bh_enable(); + raw_local_irq_enable(); + __cond_resched(); + local_bh_disable(); + return 1; + } + return 0; +} +EXPORT_SYMBOL(cond_resched_softirq_context); + /** * yield - yield the current processor to other threads. * Index: linux-2.6.26/kernel/softirq.c =================================================================== --- linux-2.6.26.orig/kernel/softirq.c +++ linux-2.6.26/kernel/softirq.c @@ -6,9 +6,15 @@ * Distribute under GPLv2. * * Rewritten. Old one was good in 2.2, but in 2.3 it was immoral. --ANK (990903) + * + * Softirq-split implemetation by + * Copyright (C) 2005 Thomas Gleixner, Ingo Molnar */ #include +#include +#include +#include #include #include #include @@ -48,7 +54,41 @@ EXPORT_SYMBOL(irq_stat); static struct softirq_action softirq_vec[32] __cacheline_aligned_in_smp; -static DEFINE_PER_CPU(struct task_struct *, ksoftirqd); +struct softirqdata { + int nr; + unsigned long cpu; + struct task_struct *tsk; +#ifdef CONFIG_PREEMPT_SOFTIRQS + wait_queue_head_t wait; + int running; +#endif +}; + +static DEFINE_PER_CPU(struct softirqdata [MAX_SOFTIRQ], ksoftirqd); + +#ifdef CONFIG_PREEMPT_SOFTIRQS +/* + * Preempting the softirq causes cases that would not be a + * problem when the softirq is not preempted. That is a + * process may have code to spin while waiting for a softirq + * to finish on another CPU. But if it happens that the + * process has preempted the softirq, this could cause a + * deadlock. + */ +void wait_for_softirq(int softirq) +{ + struct softirqdata *data = &__get_cpu_var(ksoftirqd)[softirq]; + if (data->running) { + DECLARE_WAITQUEUE(wait, current); + set_current_state(TASK_UNINTERRUPTIBLE); + add_wait_queue(&data->wait, &wait); + if (data->running) + schedule(); + remove_wait_queue(&data->wait, &wait); + __set_current_state(TASK_RUNNING); + } +} +#endif /* * we cannot loop indefinitely here to avoid userspace starvation, @@ -56,16 +96,32 @@ static DEFINE_PER_CPU(struct task_struct * to the pending events, so lets the scheduler to balance * the softirq load for us. */ -static inline void wakeup_softirqd(void) +static void wakeup_softirqd(int softirq) { /* Interrupts are disabled: no need to stop preemption */ - struct task_struct *tsk = __get_cpu_var(ksoftirqd); + struct task_struct *tsk = __get_cpu_var(ksoftirqd)[softirq].tsk; if (tsk && tsk->state != TASK_RUNNING) wake_up_process(tsk); } /* + * Wake up the softirq threads which have work + */ +static void trigger_softirqs(void) +{ + u32 pending = local_softirq_pending(); + int curr = 0; + + while (pending) { + if (pending & 1) + wakeup_softirqd(curr); + pending >>= 1; + curr++; + } +} + +/* * This one is for softirq.c-internal use, * where hardirqs are disabled legitimately: */ @@ -100,20 +156,6 @@ void local_bh_disable(void) EXPORT_SYMBOL(local_bh_disable); -void __local_bh_enable(void) -{ - WARN_ON_ONCE(in_irq()); - - /* - * softirqs should never be enabled by __local_bh_enable(), - * it always nests inside local_bh_enable() sections: - */ - WARN_ON_ONCE(softirq_count() == SOFTIRQ_OFFSET); - - sub_preempt_count(SOFTIRQ_OFFSET); -} -EXPORT_SYMBOL_GPL(__local_bh_enable); - /* * Special-case - softirqs can safely be enabled in * cond_resched_softirq(), or by __do_softirq(), @@ -207,7 +249,7 @@ EXPORT_SYMBOL(local_bh_enable_ip); */ #define MAX_SOFTIRQ_RESTART 10 -asmlinkage void __do_softirq(void) +asmlinkage void ___do_softirq(void) { struct softirq_action *h; __u32 pending; @@ -217,9 +259,6 @@ asmlinkage void __do_softirq(void) pending = local_softirq_pending(); account_system_vtime(current); - __local_bh_disable((unsigned long)__builtin_return_address(0)); - trace_softirq_enter(); - cpu = smp_processor_id(); restart: /* Reset the pending bitmask before enabling irqs */ @@ -231,8 +270,17 @@ restart: do { if (pending & 1) { - h->action(h); + { + u32 preempt_count = preempt_count(); + h->action(h); + if (preempt_count != preempt_count()) { + print_symbol("BUG: softirq exited %s with wrong preemption count!\n", (unsigned long) h->action); + printk("entered with %08x, exited with %08x.\n", preempt_count, preempt_count()); + preempt_count() = preempt_count; + } + } rcu_bh_qsctr_inc(cpu); + cond_resched_softirq_context(); } h++; pending >>= 1; @@ -245,12 +293,34 @@ restart: goto restart; if (pending) - wakeup_softirqd(); + trigger_softirqs(); +} + +asmlinkage void __do_softirq(void) +{ +#ifdef CONFIG_PREEMPT_SOFTIRQS + /* + * 'preempt harder'. Push all softirq processing off to ksoftirqd. + */ + if (softirq_preemption) { + if (local_softirq_pending()) + trigger_softirqs(); + return; + } +#endif + /* + * 'immediate' softirq execution: + */ + __local_bh_disable((unsigned long)__builtin_return_address(0)); + trace_softirq_enter(); + + ___do_softirq(); trace_softirq_exit(); account_system_vtime(current); _local_bh_enable(); + } #ifndef __ARCH_HAS_DO_SOFTIRQ @@ -323,19 +393,11 @@ void irq_exit(void) */ inline void raise_softirq_irqoff(unsigned int nr) { - __raise_softirq_irqoff(nr); + __do_raise_softirq_irqoff(nr); - /* - * If we're in an interrupt or softirq, we're done - * (this also catches softirq-disabled code). We will - * actually run the softirq once we return from - * the irq or softirq. - * - * Otherwise we wake up ksoftirqd to make sure we - * schedule the softirq soon. - */ - if (!in_interrupt()) - wakeup_softirqd(); +#ifdef CONFIG_PREEMPT_SOFTIRQS + wakeup_softirqd(nr); +#endif } void raise_softirq(unsigned int nr) @@ -423,7 +485,7 @@ static void tasklet_action(struct softir t->next = NULL; *__get_cpu_var(tasklet_vec).tail = t; __get_cpu_var(tasklet_vec).tail = &(t->next); - __raise_softirq_irqoff(TASKLET_SOFTIRQ); + __do_raise_softirq_irqoff(TASKLET_SOFTIRQ); local_irq_enable(); } } @@ -458,7 +520,7 @@ static void tasklet_hi_action(struct sof t->next = NULL; *__get_cpu_var(tasklet_hi_vec).tail = t; __get_cpu_var(tasklet_hi_vec).tail = &(t->next); - __raise_softirq_irqoff(HI_SOFTIRQ); + __do_raise_softirq_irqoff(HI_SOFTIRQ); local_irq_enable(); } } @@ -507,13 +569,24 @@ void __init softirq_init(void) open_softirq(HI_SOFTIRQ, tasklet_hi_action, NULL); } -static int ksoftirqd(void * __bind_cpu) +static int ksoftirqd(void * __data) { + struct sched_param param = { .sched_priority = MAX_USER_RT_PRIO/2 }; + struct softirqdata *data = __data; + u32 mask = (1 << data->nr); + struct softirq_action *h; + +#ifdef CONFIG_PREEMPT_SOFTIRQS + init_waitqueue_head(&data->wait); +#endif + + sys_sched_setscheduler(current->pid, SCHED_FIFO, ¶m); + current->flags |= PF_SOFTIRQ; set_current_state(TASK_INTERRUPTIBLE); while (!kthread_should_stop()) { preempt_disable(); - if (!local_softirq_pending()) { + if (!(local_softirq_pending() & mask)) { preempt_enable_no_resched(); schedule(); preempt_disable(); @@ -521,19 +594,41 @@ static int ksoftirqd(void * __bind_cpu) __set_current_state(TASK_RUNNING); - while (local_softirq_pending()) { +#ifdef CONFIG_PREEMPT_SOFTIRQS + data->running = 1; +#endif + + while (local_softirq_pending() & mask) { /* Preempt disable stops cpu going offline. If already offline, we'll be on wrong CPU: don't process */ - if (cpu_is_offline((long)__bind_cpu)) + if (cpu_is_offline(data->cpu)) goto wait_to_die; - do_softirq(); + + local_irq_disable(); preempt_enable_no_resched(); + set_softirq_pending(local_softirq_pending() & ~mask); + local_bh_disable(); + local_irq_enable(); + + h = &softirq_vec[data->nr]; + if (h) + h->action(h); + rcu_bh_qsctr_inc(data->cpu); + + local_irq_disable(); + _local_bh_enable(); + local_irq_enable(); + cond_resched(); preempt_disable(); } preempt_enable(); set_current_state(TASK_INTERRUPTIBLE); +#ifdef CONFIG_PREEMPT_SOFTIRQS + data->running = 0; + wake_up(&data->wait); +#endif } __set_current_state(TASK_RUNNING); return 0; @@ -583,7 +678,7 @@ void tasklet_kill_immediate(struct taskl BUG(); } -static void takeover_tasklets(unsigned int cpu) +void takeover_tasklets(unsigned int cpu) { /* CPU is dead, so no lock needed. */ local_irq_disable(); @@ -609,49 +704,82 @@ static void takeover_tasklets(unsigned i } #endif /* CONFIG_HOTPLUG_CPU */ +static const char *softirq_names [] = +{ + [HI_SOFTIRQ] = "high", + [SCHED_SOFTIRQ] = "sched", + [TIMER_SOFTIRQ] = "timer", + [NET_TX_SOFTIRQ] = "net-tx", + [NET_RX_SOFTIRQ] = "net-rx", + [BLOCK_SOFTIRQ] = "block", + [TASKLET_SOFTIRQ] = "tasklet", +#ifdef CONFIG_HIGH_RES_TIMERS + [HRTIMER_SOFTIRQ] = "hrtimer", +#endif + [RCU_SOFTIRQ] = "rcu", +}; + static int __cpuinit cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { - int hotcpu = (unsigned long)hcpu; + int hotcpu = (unsigned long)hcpu, i; struct task_struct *p; switch (action) { case CPU_UP_PREPARE: case CPU_UP_PREPARE_FROZEN: - p = kthread_create(ksoftirqd, hcpu, "ksoftirqd/%d", hotcpu); - if (IS_ERR(p)) { - printk("ksoftirqd for %i failed\n", hotcpu); - return NOTIFY_BAD; + for (i = 0; i < MAX_SOFTIRQ; i++) { + per_cpu(ksoftirqd, hotcpu)[i].nr = i; + per_cpu(ksoftirqd, hotcpu)[i].cpu = hotcpu; + per_cpu(ksoftirqd, hotcpu)[i].tsk = NULL; } - kthread_bind(p, hotcpu); - per_cpu(ksoftirqd, hotcpu) = p; - break; + for (i = 0; i < MAX_SOFTIRQ; i++) { + p = kthread_create(ksoftirqd, + &per_cpu(ksoftirqd, hotcpu)[i], + "softirq-%s/%d", softirq_names[i], + hotcpu); + if (IS_ERR(p)) { + printk("ksoftirqd %d for %i failed\n", i, + hotcpu); + return NOTIFY_BAD; + } + kthread_bind(p, hotcpu); + per_cpu(ksoftirqd, hotcpu)[i].tsk = p; + } + break; + break; case CPU_ONLINE: case CPU_ONLINE_FROZEN: - wake_up_process(per_cpu(ksoftirqd, hotcpu)); + for (i = 0; i < MAX_SOFTIRQ; i++) + wake_up_process(per_cpu(ksoftirqd, hotcpu)[i].tsk); break; #ifdef CONFIG_HOTPLUG_CPU case CPU_UP_CANCELED: case CPU_UP_CANCELED_FROZEN: - if (!per_cpu(ksoftirqd, hotcpu)) - break; - /* Unbind so it can run. Fall thru. */ - kthread_bind(per_cpu(ksoftirqd, hotcpu), - any_online_cpu(cpu_online_map)); +#if 0 + for (i = 0; i < MAX_SOFTIRQ; i++) { + if (!per_cpu(ksoftirqd, hotcpu)[i].tsk) + continue; + kthread_bind(per_cpu(ksoftirqd, hotcpu)[i].tsk, + any_online_cpu(cpu_online_map)); + } +#endif case CPU_DEAD: case CPU_DEAD_FROZEN: { struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 }; - p = per_cpu(ksoftirqd, hotcpu); - per_cpu(ksoftirqd, hotcpu) = NULL; - sched_setscheduler(p, SCHED_FIFO, ¶m); - kthread_stop(p); + for (i = 0; i < MAX_SOFTIRQ; i++) { + p = per_cpu(ksoftirqd, hotcpu)[i].tsk; + per_cpu(ksoftirqd, hotcpu)[i].tsk = NULL; + sched_setscheduler(p, SCHED_FIFO, ¶m); + kthread_stop(p); + } takeover_tasklets(hotcpu); break; - } -#endif /* CONFIG_HOTPLUG_CPU */ } +#endif /* CONFIG_HOTPLUG_CPU */ + } return NOTIFY_OK; } @@ -670,6 +798,29 @@ __init int spawn_ksoftirqd(void) return 0; } + +#ifdef CONFIG_PREEMPT_SOFTIRQS + +int softirq_preemption = 1; + +EXPORT_SYMBOL(softirq_preemption); + +static int __init softirq_preempt_setup (char *str) +{ + if (!strncmp(str, "off", 3)) + softirq_preemption = 0; + else + get_option(&str, &softirq_preemption); + if (!softirq_preemption) + printk("turning off softirq preemption!\n"); + + return 1; +} + +__setup("softirq-preempt=", softirq_preempt_setup); + +#endif + #ifdef CONFIG_SMP /* * Call a function on all processors patches/preempt-irqs-core.patch0000664000076400007640000006444111043564046015650 0ustar tglxtglx--- include/linux/interrupt.h | 16 +- include/linux/irq.h | 26 +++- include/linux/sched.h | 15 ++ init/main.c | 5 kernel/irq/autoprobe.c | 1 kernel/irq/chip.c | 38 +++++ kernel/irq/handle.c | 37 +++++ kernel/irq/internals.h | 4 kernel/irq/manage.c | 292 +++++++++++++++++++++++++++++++++++++++++++++- kernel/irq/proc.c | 129 ++++++++++++++------ kernel/irq/spurious.c | 12 + kernel/sched.c | 23 +++ 12 files changed, 543 insertions(+), 55 deletions(-) Index: linux-2.6.26/include/linux/interrupt.h =================================================================== --- linux-2.6.26.orig/include/linux/interrupt.h +++ linux-2.6.26/include/linux/interrupt.h @@ -50,10 +50,12 @@ #define IRQF_SAMPLE_RANDOM 0x00000040 #define IRQF_SHARED 0x00000080 #define IRQF_PROBE_SHARED 0x00000100 -#define IRQF_TIMER 0x00000200 +#define __IRQF_TIMER 0x00000200 #define IRQF_PERCPU 0x00000400 #define IRQF_NOBALANCING 0x00000800 #define IRQF_IRQPOLL 0x00001000 +#define IRQF_NODELAY 0x00002000 +#define IRQF_TIMER (__IRQF_TIMER | IRQF_NODELAY) typedef irqreturn_t (*irq_handler_t)(int, void *); @@ -65,7 +67,7 @@ struct irqaction { void *dev_id; struct irqaction *next; int irq; - struct proc_dir_entry *dir; + struct proc_dir_entry *dir, *threaded; }; extern irqreturn_t no_action(int cpl, void *dev_id); @@ -215,6 +217,7 @@ static inline int disable_irq_wake(unsig #ifndef __ARCH_SET_SOFTIRQ_PENDING #define set_softirq_pending(x) (local_softirq_pending() = (x)) +// FIXME: PREEMPT_RT: set_bit()? #define or_softirq_pending(x) (local_softirq_pending() |= (x)) #endif @@ -290,8 +293,13 @@ struct softirq_action void *data; }; -#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0) -#define __do_raise_softirq_irqoff(nr) __raise_softirq_irqoff(nr) +#ifdef CONFIG_PREEMPT_HARDIRQS +# define __raise_softirq_irqoff(nr) raise_softirq_irqoff(nr) +# define __do_raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0) +#else +# define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0) +# define __do_raise_softirq_irqoff(nr) __raise_softirq_irqoff(nr) +#endif asmlinkage void do_softirq(void); asmlinkage void __do_softirq(void); Index: linux-2.6.26/include/linux/irq.h =================================================================== --- linux-2.6.26.orig/include/linux/irq.h +++ linux-2.6.26/include/linux/irq.h @@ -19,10 +19,12 @@ #include #include #include +#include #include #include #include +#include struct irq_desc; typedef void (*irq_flow_handler_t)(unsigned int irq, @@ -62,6 +64,7 @@ typedef void (*irq_flow_handler_t)(unsig #define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */ #define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */ #define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */ +#define IRQ_NODELAY 0x40000000 /* IRQ must run immediately */ #ifdef CONFIG_IRQ_PER_CPU # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU) @@ -142,6 +145,9 @@ struct irq_chip { * @irq_count: stats field to detect stalled irqs * @irqs_unhandled: stats field for spurious unhandled interrupts * @last_unhandled: aging timer for unhandled count + * @thread: Thread pointer for threaded preemptible irq handling + * @wait_for_handler: Waitqueue to wait for a running preemptible handler + * @cycles: Timestamp for stats and debugging * @lock: locking for SMP * @affinity: IRQ affinity on SMP * @cpu: cpu index useful for balancing @@ -164,6 +170,9 @@ struct irq_desc { unsigned int irq_count; /* For detecting broken IRQs */ unsigned int irqs_unhandled; unsigned long last_unhandled; /* Aging timer for unhandled count */ + struct task_struct *thread; + wait_queue_head_t wait_for_handler; + cycles_t timestamp; spinlock_t lock; #ifdef CONFIG_SMP cpumask_t affinity; @@ -387,7 +396,22 @@ extern int set_irq_msi(unsigned int irq, #define get_irq_data(irq) (irq_desc[irq].handler_data) #define get_irq_msi(irq) (irq_desc[irq].msi_desc) -#endif /* CONFIG_GENERIC_HARDIRQS */ +/* Early initialization of irqs */ +extern void early_init_hardirqs(void); +extern cycles_t irq_timestamp(unsigned int irq); + +#if defined(CONFIG_PREEMPT_HARDIRQS) +extern void init_hardirqs(void); +#else +static inline void init_hardirqs(void) { } +#endif + +#else /* end GENERIC HARDIRQS */ + +static inline void early_init_hardirqs(void) { } +static inline void init_hardirqs(void) { } + +#endif /* !CONFIG_GENERIC_HARDIRQS */ #endif /* !CONFIG_S390 */ Index: linux-2.6.26/include/linux/sched.h =================================================================== --- linux-2.6.26.orig/include/linux/sched.h +++ linux-2.6.26/include/linux/sched.h @@ -96,6 +96,12 @@ extern int softirq_preemption; # define softirq_preemption 0 #endif +#ifdef CONFIG_PREEMPT_HARDIRQS +extern int hardirq_preemption; +#else +# define hardirq_preemption 0 +#endif + struct mem_cgroup; struct exec_domain; struct futex_pi_state; @@ -1543,6 +1549,7 @@ static inline void put_task_struct(struc #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ #define PF_SOFTIRQ 0x04000000 /* softirq context */ +#define PF_HARDIRQ 0x08000000 /* hardirq context */ #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ @@ -2114,6 +2121,7 @@ static inline int cond_resched_bkl(void) return _cond_resched(); } extern int cond_resched_softirq_context(void); +extern int cond_resched_hardirq_context(void); /* * Does a critical section need to be broken due to another @@ -2136,6 +2144,13 @@ static inline int softirq_need_resched(v return 0; } +static inline int hardirq_need_resched(void) +{ + if (hardirq_preemption && (current->flags & PF_HARDIRQ)) + return need_resched(); + return 0; +} + /* * Reevaluate whether the task has signals pending delivery. * Wake the task if so. Index: linux-2.6.26/init/main.c =================================================================== --- linux-2.6.26.orig/init/main.c +++ linux-2.6.26/init/main.c @@ -47,6 +47,7 @@ #include #include #include +#include #include #include #include @@ -580,8 +581,10 @@ asmlinkage void __init start_kernel(void * fragile until we cpu_idle() for the first time. */ preempt_disable(); + build_all_zonelists(); page_alloc_init(); + early_init_hardirqs(); printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); parse_early_param(); parse_args("Booting kernel", static_command_line, __start___param, @@ -856,6 +859,8 @@ static int __init kernel_init(void * unu smp_prepare_cpus(setup_max_cpus); + init_hardirqs(); + do_pre_smp_initcalls(); smp_init(); Index: linux-2.6.26/kernel/irq/autoprobe.c =================================================================== --- linux-2.6.26.orig/kernel/irq/autoprobe.c +++ linux-2.6.26/kernel/irq/autoprobe.c @@ -7,6 +7,7 @@ */ #include +#include #include #include #include Index: linux-2.6.26/kernel/irq/chip.c =================================================================== --- linux-2.6.26.orig/kernel/irq/chip.c +++ linux-2.6.26/kernel/irq/chip.c @@ -287,8 +287,10 @@ static inline void mask_ack_irq(struct i if (desc->chip->mask_ack) desc->chip->mask_ack(irq); else { - desc->chip->mask(irq); - desc->chip->ack(irq); + if (desc->chip->mask) + desc->chip->mask(irq); + if (desc->chip->ack) + desc->chip->ack(irq); } } @@ -313,8 +315,10 @@ handle_simple_irq(unsigned int irq, stru spin_lock(&desc->lock); - if (unlikely(desc->status & IRQ_INPROGRESS)) + if (unlikely(desc->status & IRQ_INPROGRESS)) { + desc->status |= IRQ_PENDING; goto out_unlock; + } desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); kstat_cpu(cpu).irqs[irq]++; @@ -323,6 +327,11 @@ handle_simple_irq(unsigned int irq, stru goto out_unlock; desc->status |= IRQ_INPROGRESS; + /* + * hardirq redirection to the irqd process context: + */ + if (redirect_hardirq(desc)) + goto out_unlock; spin_unlock(&desc->lock); action_ret = handle_IRQ_event(irq, action); @@ -369,6 +378,13 @@ handle_level_irq(unsigned int irq, struc goto out_unlock; desc->status |= IRQ_INPROGRESS; + + /* + * hardirq redirection to the irqd process context: + */ + if (redirect_hardirq(desc)) + goto out_unlock; + spin_unlock(&desc->lock); action_ret = handle_IRQ_event(irq, action); @@ -421,6 +437,15 @@ handle_fasteoi_irq(unsigned int irq, str } desc->status |= IRQ_INPROGRESS; + /* + * In the threaded case we fall back to a mask+eoi sequence: + */ + if (redirect_hardirq(desc)) { + if (desc->chip->mask) + desc->chip->mask(irq); + goto out; + } + desc->status &= ~IRQ_PENDING; spin_unlock(&desc->lock); @@ -432,7 +457,6 @@ handle_fasteoi_irq(unsigned int irq, str desc->status &= ~IRQ_INPROGRESS; out: desc->chip->eoi(irq); - spin_unlock(&desc->lock); } @@ -481,6 +505,12 @@ handle_edge_irq(unsigned int irq, struct /* Mark the IRQ currently in progress.*/ desc->status |= IRQ_INPROGRESS; + /* + * hardirq redirection to the irqd process context: + */ + if (redirect_hardirq(desc)) + goto out_unlock; + do { struct irqaction *action = desc->action; irqreturn_t action_ret; Index: linux-2.6.26/kernel/irq/handle.c =================================================================== --- linux-2.6.26.orig/kernel/irq/handle.c +++ linux-2.6.26/kernel/irq/handle.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include @@ -133,24 +134,54 @@ irqreturn_t handle_IRQ_event(unsigned in handle_dynamic_tick(action); - if (!(action->flags & IRQF_DISABLED)) - local_irq_enable_in_hardirq(); + /* + * Unconditionally enable interrupts for threaded + * IRQ handlers: + */ + if (!hardirq_count() || !(action->flags & IRQF_DISABLED)) + local_irq_enable(); do { + unsigned int preempt_count = preempt_count(); + ret = action->handler(irq, action->dev_id); + if (preempt_count() != preempt_count) { + print_symbol("BUG: unbalanced irq-handler preempt count in %s!\n", (unsigned long) action->handler); + printk("entered with %08x, exited with %08x.\n", preempt_count, preempt_count()); + dump_stack(); + preempt_count() = preempt_count; + } if (ret == IRQ_HANDLED) status |= action->flags; retval |= ret; action = action->next; } while (action); - if (status & IRQF_SAMPLE_RANDOM) + if (status & IRQF_SAMPLE_RANDOM) { + local_irq_enable(); add_interrupt_randomness(irq); + } local_irq_disable(); return retval; } +int redirect_hardirq(struct irq_desc *desc) +{ + /* + * Direct execution: + */ + if (!hardirq_preemption || (desc->status & IRQ_NODELAY) || + !desc->thread) + return 0; + + BUG_ON(!irqs_disabled()); + if (desc->thread && desc->thread->state != TASK_RUNNING) + wake_up_process(desc->thread); + + return 1; +} + #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ /** * __do_IRQ - original all in one highlevel IRQ handler Index: linux-2.6.26/kernel/irq/internals.h =================================================================== --- linux-2.6.26.orig/kernel/irq/internals.h +++ linux-2.6.26/kernel/irq/internals.h @@ -10,6 +10,10 @@ extern void irq_chip_set_defaults(struct /* Set default handler: */ extern void compat_irq_chip_set_default_handler(struct irq_desc *desc); +extern int redirect_hardirq(struct irq_desc *desc); + +void recalculate_desc_flags(struct irq_desc *desc); + #ifdef CONFIG_PROC_FS extern void register_irq_proc(unsigned int irq); extern void register_handler_proc(unsigned int irq, struct irqaction *action); Index: linux-2.6.26/kernel/irq/manage.c =================================================================== --- linux-2.6.26.orig/kernel/irq/manage.c +++ linux-2.6.26/kernel/irq/manage.c @@ -8,8 +8,10 @@ */ #include -#include #include +#include +#include +#include #include #include @@ -42,8 +44,12 @@ void synchronize_irq(unsigned int irq) * Wait until we're out of the critical section. This might * give the wrong answer due to the lack of memory barriers. */ - while (desc->status & IRQ_INPROGRESS) - cpu_relax(); + if (hardirq_preemption && !(desc->status & IRQ_NODELAY)) + wait_event(desc->wait_for_handler, + !(desc->status & IRQ_INPROGRESS)); + else + while (desc->status & IRQ_INPROGRESS) + cpu_relax(); /* Ok, that indicated we're done: double-check carefully. */ spin_lock_irqsave(&desc->lock, flags); @@ -240,6 +246,21 @@ int set_irq_wake(unsigned int irq, unsig EXPORT_SYMBOL(set_irq_wake); /* + * If any action has IRQF_NODELAY then turn IRQ_NODELAY on: + */ +void recalculate_desc_flags(struct irq_desc *desc) +{ + struct irqaction *action; + + desc->status &= ~IRQ_NODELAY; + for (action = desc->action ; action; action = action->next) + if (action->flags & IRQF_NODELAY) + desc->status |= IRQ_NODELAY; +} + +static int start_irq_thread(int irq, struct irq_desc *desc); + +/* * Internal function that tells the architecture code whether a * particular irq has been exclusively allocated or is available * for driver use. @@ -304,6 +325,9 @@ int setup_irq(unsigned int irq, struct i rand_initialize_irq(irq); } + if (!(new->flags & IRQF_NODELAY)) + if (start_irq_thread(irq, desc)) + return -ENOMEM; /* * The following block of code has to be executed atomically */ @@ -344,6 +368,11 @@ int setup_irq(unsigned int irq, struct i if (new->flags & IRQF_NOBALANCING) desc->status |= IRQ_NO_BALANCING; + /* + * Propagate any possible IRQF_NODELAY flag into IRQ_NODELAY: + */ + recalculate_desc_flags(desc); + if (!shared) { irq_chip_set_defaults(desc->chip); @@ -400,7 +429,7 @@ int setup_irq(unsigned int irq, struct i new->irq = irq; register_irq_proc(irq); - new->dir = NULL; + new->dir = new->threaded = NULL; register_handler_proc(irq, new); return 0; @@ -471,6 +500,7 @@ void free_irq(unsigned int irq, void *de else desc->chip->disable(irq); } + recalculate_desc_flags(desc); spin_unlock_irqrestore(&desc->lock, flags); unregister_handler_proc(irq, action); @@ -596,3 +626,257 @@ int request_irq(unsigned int irq, irq_ha return retval; } EXPORT_SYMBOL(request_irq); + +#ifdef CONFIG_PREEMPT_HARDIRQS + +int hardirq_preemption = 1; + +EXPORT_SYMBOL(hardirq_preemption); + +static int __init hardirq_preempt_setup (char *str) +{ + if (!strncmp(str, "off", 3)) + hardirq_preemption = 0; + else + get_option(&str, &hardirq_preemption); + if (!hardirq_preemption) + printk("turning off hardirq preemption!\n"); + + return 1; +} + +__setup("hardirq-preempt=", hardirq_preempt_setup); + + +/* + * threaded simple handler + */ +static void thread_simple_irq(irq_desc_t *desc) +{ + struct irqaction *action = desc->action; + unsigned int irq = desc - irq_desc; + irqreturn_t action_ret; + + if (action && !desc->depth) { + spin_unlock(&desc->lock); + action_ret = handle_IRQ_event(irq, action); + cond_resched_hardirq_context(); + spin_lock_irq(&desc->lock); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret); + } + desc->status &= ~IRQ_INPROGRESS; +} + +/* + * threaded level type irq handler + */ +static void thread_level_irq(irq_desc_t *desc) +{ + unsigned int irq = desc - irq_desc; + + thread_simple_irq(desc); + if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask) + desc->chip->unmask(irq); +} + +/* + * threaded fasteoi type irq handler + */ +static void thread_fasteoi_irq(irq_desc_t *desc) +{ + unsigned int irq = desc - irq_desc; + + thread_simple_irq(desc); + if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask) + desc->chip->unmask(irq); +} + +/* + * threaded edge type IRQ handler + */ +static void thread_edge_irq(irq_desc_t *desc) +{ + unsigned int irq = desc - irq_desc; + + do { + struct irqaction *action = desc->action; + irqreturn_t action_ret; + + if (unlikely(!action)) { + desc->status &= ~IRQ_INPROGRESS; + desc->chip->mask(irq); + return; + } + + /* + * When another irq arrived while we were handling + * one, we could have masked the irq. + * Renable it, if it was not disabled in meantime. + */ + if (unlikely(((desc->status & (IRQ_PENDING | IRQ_MASKED)) == + (IRQ_PENDING | IRQ_MASKED)) && !desc->depth)) + desc->chip->unmask(irq); + + desc->status &= ~IRQ_PENDING; + spin_unlock(&desc->lock); + action_ret = handle_IRQ_event(irq, action); + cond_resched_hardirq_context(); + spin_lock_irq(&desc->lock); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret); + } while ((desc->status & IRQ_PENDING) && !desc->depth); + + desc->status &= ~IRQ_INPROGRESS; +} + +/* + * threaded edge type IRQ handler + */ +static void thread_do_irq(irq_desc_t *desc) +{ + unsigned int irq = desc - irq_desc; + + do { + struct irqaction *action = desc->action; + irqreturn_t action_ret; + + if (unlikely(!action)) { + desc->status &= ~IRQ_INPROGRESS; + desc->chip->disable(irq); + return; + } + + desc->status &= ~IRQ_PENDING; + spin_unlock(&desc->lock); + action_ret = handle_IRQ_event(irq, action); + cond_resched_hardirq_context(); + spin_lock_irq(&desc->lock); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret); + } while ((desc->status & IRQ_PENDING) && !desc->depth); + + desc->status &= ~IRQ_INPROGRESS; + desc->chip->end(irq); +} + +static void do_hardirq(struct irq_desc *desc) +{ + unsigned long flags; + + spin_lock_irqsave(&desc->lock, flags); + + if (!(desc->status & IRQ_INPROGRESS)) + goto out; + + if (desc->handle_irq == handle_simple_irq) + thread_simple_irq(desc); + else if (desc->handle_irq == handle_level_irq) + thread_level_irq(desc); + else if (desc->handle_irq == handle_fasteoi_irq) + thread_fasteoi_irq(desc); + else if (desc->handle_irq == handle_edge_irq) + thread_edge_irq(desc); + else + thread_do_irq(desc); + out: + spin_unlock_irqrestore(&desc->lock, flags); + + if (waitqueue_active(&desc->wait_for_handler)) + wake_up(&desc->wait_for_handler); +} + +extern asmlinkage void __do_softirq(void); + +static int do_irqd(void * __desc) +{ + struct sched_param param = { 0, }; + struct irq_desc *desc = __desc; + +#ifdef CONFIG_SMP + set_cpus_allowed(current, desc->affinity); +#endif + current->flags |= PF_NOFREEZE | PF_HARDIRQ; + + /* + * Set irq thread priority to SCHED_FIFO/50: + */ + param.sched_priority = MAX_USER_RT_PRIO/2; + + sys_sched_setscheduler(current->pid, SCHED_FIFO, ¶m); + + while (!kthread_should_stop()) { + local_irq_disable(); + set_current_state(TASK_INTERRUPTIBLE); + irq_enter(); + do_hardirq(desc); + irq_exit(); + local_irq_enable(); + cond_resched(); +#ifdef CONFIG_SMP + /* + * Did IRQ affinities change? + */ + if (!cpus_equal(current->cpus_allowed, desc->affinity)) + set_cpus_allowed(current, desc->affinity); +#endif + schedule(); + } + __set_current_state(TASK_RUNNING); + + return 0; +} + +static int ok_to_create_irq_threads; + +static int start_irq_thread(int irq, struct irq_desc *desc) +{ + if (desc->thread || !ok_to_create_irq_threads) + return 0; + + desc->thread = kthread_create(do_irqd, desc, "IRQ-%d", irq); + if (!desc->thread) { + printk(KERN_ERR "irqd: could not create IRQ thread %d!\n", irq); + return -ENOMEM; + } + + /* + * An interrupt may have come in before the thread pointer was + * stored in desc->thread; make sure the thread gets woken up in + * such a case: + */ + smp_mb(); + wake_up_process(desc->thread); + + return 0; +} + +void __init init_hardirqs(void) +{ + int i; + ok_to_create_irq_threads = 1; + + for (i = 0; i < NR_IRQS; i++) { + irq_desc_t *desc = irq_desc + i; + + if (desc->action && !(desc->status & IRQ_NODELAY)) + start_irq_thread(i, desc); + } +} + +#else + +static int start_irq_thread(int irq, struct irq_desc *desc) +{ + return 0; +} + +#endif + +void __init early_init_hardirqs(void) +{ + int i; + + for (i = 0; i < NR_IRQS; i++) + init_waitqueue_head(&irq_desc[i].wait_for_handler); +} Index: linux-2.6.26/kernel/irq/proc.c =================================================================== --- linux-2.6.26.orig/kernel/irq/proc.c +++ linux-2.6.26/kernel/irq/proc.c @@ -7,6 +7,8 @@ */ #include +#include +#include #include #include @@ -87,44 +89,6 @@ static int irq_spurious_read(char *page, jiffies_to_msecs(d->last_unhandled)); } -#define MAX_NAMELEN 128 - -static int name_unique(unsigned int irq, struct irqaction *new_action) -{ - struct irq_desc *desc = irq_desc + irq; - struct irqaction *action; - unsigned long flags; - int ret = 1; - - spin_lock_irqsave(&desc->lock, flags); - for (action = desc->action ; action; action = action->next) { - if ((action != new_action) && action->name && - !strcmp(new_action->name, action->name)) { - ret = 0; - break; - } - } - spin_unlock_irqrestore(&desc->lock, flags); - return ret; -} - -void register_handler_proc(unsigned int irq, struct irqaction *action) -{ - char name [MAX_NAMELEN]; - - if (!irq_desc[irq].dir || action->dir || !action->name || - !name_unique(irq, action)) - return; - - memset(name, 0, MAX_NAMELEN); - snprintf(name, MAX_NAMELEN, "%s", action->name); - - /* create /proc/irq/1234/handler/ */ - action->dir = proc_mkdir(name, irq_desc[irq].dir); -} - -#undef MAX_NAMELEN - #define MAX_NAMELEN 10 void register_irq_proc(unsigned int irq) @@ -167,10 +131,96 @@ void register_irq_proc(unsigned int irq) void unregister_handler_proc(unsigned int irq, struct irqaction *action) { + if (action->threaded) + remove_proc_entry(action->threaded->name, action->dir); if (action->dir) remove_proc_entry(action->dir->name, irq_desc[irq].dir); } +#ifndef CONFIG_PREEMPT_RT + +static int threaded_read_proc(char *page, char **start, off_t off, + int count, int *eof, void *data) +{ + return sprintf(page, "%c\n", + ((struct irqaction *)data)->flags & IRQF_NODELAY ? '0' : '1'); +} + +static int threaded_write_proc(struct file *file, const char __user *buffer, + unsigned long count, void *data) +{ + int c; + struct irqaction *action = data; + irq_desc_t *desc = irq_desc + action->irq; + + if (get_user(c, buffer)) + return -EFAULT; + if (c != '0' && c != '1') + return -EINVAL; + + spin_lock_irq(&desc->lock); + + if (c == '0') + action->flags |= IRQF_NODELAY; + if (c == '1') + action->flags &= ~IRQF_NODELAY; + recalculate_desc_flags(desc); + + spin_unlock_irq(&desc->lock); + + return 1; +} + +#endif + +#define MAX_NAMELEN 128 + +static int name_unique(unsigned int irq, struct irqaction *new_action) +{ + struct irq_desc *desc = irq_desc + irq; + struct irqaction *action; + + for (action = desc->action ; action; action = action->next) + if ((action != new_action) && action->name && + !strcmp(new_action->name, action->name)) + return 0; + return 1; +} + +void register_handler_proc(unsigned int irq, struct irqaction *action) +{ + char name [MAX_NAMELEN]; + + if (!irq_desc[irq].dir || action->dir || !action->name || + !name_unique(irq, action)) + return; + + memset(name, 0, MAX_NAMELEN); + snprintf(name, MAX_NAMELEN, "%s", action->name); + + /* create /proc/irq/1234/handler/ */ + action->dir = proc_mkdir(name, irq_desc[irq].dir); + + if (!action->dir) + return; +#ifndef CONFIG_PREEMPT_RT + { + struct proc_dir_entry *entry; + /* create /proc/irq/1234/handler/threaded */ + entry = create_proc_entry("threaded", 0600, action->dir); + if (!entry) + return; + entry->nlink = 1; + entry->data = (void *)action; + entry->read_proc = threaded_read_proc; + entry->write_proc = threaded_write_proc; + action->threaded = entry; + } +#endif +} + +#undef MAX_NAMELEN + void init_irq_proc(void) { int i; @@ -180,6 +230,9 @@ void init_irq_proc(void) if (!root_irq_dir) return; + /* create /proc/irq/prof_cpu_mask */ + create_prof_cpu_mask(root_irq_dir); + /* * Create entries for all existing IRQs. */ Index: linux-2.6.26/kernel/irq/spurious.c =================================================================== --- linux-2.6.26.orig/kernel/irq/spurious.c +++ linux-2.6.26/kernel/irq/spurious.c @@ -13,6 +13,11 @@ #include #include +#ifdef CONFIG_X86_IO_APIC +# include +# include +#endif + static int irqfixup __read_mostly; /* @@ -205,6 +210,12 @@ void note_interrupt(unsigned int irq, st * The interrupt is stuck */ __report_bad_irq(irq, desc, action_ret); +#ifdef CONFIG_X86_IO_APIC + if (!sis_apic_bug) { + sis_apic_bug = 1; + printk(KERN_ERR "turning off IO-APIC fast mode.\n"); + } +#else /* * Now kill the IRQ */ @@ -212,6 +223,7 @@ void note_interrupt(unsigned int irq, st desc->status |= IRQ_DISABLED | IRQ_SPURIOUS_DISABLED; desc->depth++; desc->chip->disable(irq); +#endif } desc->irqs_unhandled = 0; } Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -3999,7 +3999,7 @@ void account_system_time(struct task_str /* Add system time to cpustat. */ tmp = cputime_to_cputime64(cputime); - if (hardirq_count() - hardirq_offset) + if (hardirq_count() - hardirq_offset || (p->flags & PF_HARDIRQ)) cpustat->irq = cputime64_add(cpustat->irq, tmp); else if (softirq_count() || (p->flags & PF_SOFTIRQ)) cpustat->softirq = cputime64_add(cpustat->softirq, tmp); @@ -5363,6 +5363,27 @@ int __sched cond_resched_softirq_context } EXPORT_SYMBOL(cond_resched_softirq_context); +/* + * Preempt a hardirq context if necessary (possible with hardirq threading): + */ +int cond_resched_hardirq_context(void) +{ + WARN_ON_ONCE(!in_irq()); + WARN_ON_ONCE(!irqs_disabled()); + + if (hardirq_need_resched()) { + irq_exit(); + local_irq_enable(); + __cond_resched(); + local_irq_disable(); + __irq_enter(); + + return 1; + } + return 0; +} +EXPORT_SYMBOL(cond_resched_hardirq_context); + /** * yield - yield the current processor to other threads. * patches/preempt-irqs-direct-debug-keyboard.patch0000664000076400007640000000467211043564046021054 0ustar tglxtglx--- include/linux/sched.h | 6 ++++++ init/main.c | 2 ++ kernel/irq/handle.c | 31 +++++++++++++++++++++++++++++++ 3 files changed, 39 insertions(+) Index: linux-2.6.26/include/linux/sched.h =================================================================== --- linux-2.6.26.orig/include/linux/sched.h +++ linux-2.6.26/include/linux/sched.h @@ -304,6 +304,12 @@ extern void hrtick_resched(void); extern void sched_show_task(struct task_struct *p); +#ifdef CONFIG_GENERIC_HARDIRQS +extern int debug_direct_keyboard; +#else +# define debug_direct_keyboard 0 +#endif + #ifdef CONFIG_DETECT_SOFTLOCKUP extern void softlockup_tick(void); extern void spawn_softlockup_task(void); Index: linux-2.6.26/init/main.c =================================================================== --- linux-2.6.26.orig/init/main.c +++ linux-2.6.26/init/main.c @@ -889,5 +889,7 @@ static int __init kernel_init(void * unu * initmem segments and start the user-mode stuff.. */ init_post(); + WARN_ON(debug_direct_keyboard); + return 0; } Index: linux-2.6.26/kernel/irq/handle.c =================================================================== --- linux-2.6.26.orig/kernel/irq/handle.c +++ linux-2.6.26/kernel/irq/handle.c @@ -132,6 +132,11 @@ irqreturn_t handle_IRQ_event(unsigned in irqreturn_t ret, retval = IRQ_NONE; unsigned int status = 0; +#ifdef __i386__ + if (debug_direct_keyboard && irq == 1) + lockdep_off(); +#endif + handle_dynamic_tick(action); /* @@ -163,9 +168,30 @@ irqreturn_t handle_IRQ_event(unsigned in } local_irq_disable(); +#ifdef __i386__ + if (debug_direct_keyboard && irq == 1) + lockdep_on(); +#endif return retval; } +/* + * Hack - used for development only. + */ +int __read_mostly debug_direct_keyboard = 0; + +int __init debug_direct_keyboard_setup(char *str) +{ + debug_direct_keyboard = 1; + printk(KERN_INFO "Switching IRQ 1 (keyboard) to to direct!\n"); +#ifdef CONFIG_PREEMPT_RT + printk(KERN_INFO "WARNING: kernel may easily crash this way!\n"); +#endif + return 1; +} + +__setup("debug_direct_keyboard", debug_direct_keyboard_setup); + int redirect_hardirq(struct irq_desc *desc) { /* @@ -175,6 +201,11 @@ int redirect_hardirq(struct irq_desc *de !desc->thread) return 0; +#ifdef __i386__ + if (debug_direct_keyboard && (desc - irq_desc == 1)) + return 0; +#endif + BUG_ON(!irqs_disabled()); if (desc->thread && desc->thread->state != TASK_RUNNING) wake_up_process(desc->thread); patches/preempt-irqs-timer.patch0000664000076400007640000001625511043564046016040 0ustar tglxtglx--- include/linux/timer.h | 4 + kernel/timer.c | 130 +++++++++++++++++++++++++++++++++++++------------- 2 files changed, 100 insertions(+), 34 deletions(-) Index: linux-2.6.26/include/linux/timer.h =================================================================== --- linux-2.6.26.orig/include/linux/timer.h +++ linux-2.6.26/include/linux/timer.h @@ -166,10 +166,12 @@ static inline void add_timer(struct time __mod_timer(timer, timer->expires); } -#ifdef CONFIG_SMP +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_SOFTIRQS) + extern int timer_pending_sync(struct timer_list *timer); extern int try_to_del_timer_sync(struct timer_list *timer); extern int del_timer_sync(struct timer_list *timer); #else +# define timer_pending_sync(t) timer_pending(t) # define try_to_del_timer_sync(t) del_timer(t) # define del_timer_sync(t) del_timer(t) #endif Index: linux-2.6.26/kernel/timer.c =================================================================== --- linux-2.6.26.orig/kernel/timer.c +++ linux-2.6.26/kernel/timer.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #include #include @@ -69,6 +70,7 @@ struct tvec_root { struct tvec_base { spinlock_t lock; struct timer_list *running_timer; + wait_queue_head_t wait_for_running_timer; unsigned long timer_jiffies; struct tvec_root tv1; struct tvec tv2; @@ -247,9 +249,7 @@ EXPORT_SYMBOL_GPL(round_jiffies_relative static inline void set_running_timer(struct tvec_base *base, struct timer_list *timer) { -#ifdef CONFIG_SMP base->running_timer = timer; -#endif } static void internal_add_timer(struct tvec_base *base, struct timer_list *timer) @@ -524,7 +524,7 @@ int __mod_timer(struct timer_list *timer { struct tvec_base *base, *new_base; unsigned long flags; - int ret = 0; + int ret = 0, cpu; timer_stats_timer_set_start_info(timer); BUG_ON(!timer->function); @@ -538,7 +538,8 @@ int __mod_timer(struct timer_list *timer debug_timer_activate(timer); - new_base = __get_cpu_var(tvec_bases); + cpu = raw_smp_processor_id(); + new_base = per_cpu(tvec_bases, cpu); if (base != new_base) { /* @@ -597,6 +598,18 @@ void add_timer_on(struct timer_list *tim spin_unlock_irqrestore(&base->lock, flags); } +/* + * Wait for a running timer + */ +void wait_for_running_timer(struct timer_list *timer) +{ + struct tvec_base *base = timer->base; + + if (base->running_timer == timer) + wait_event(base->wait_for_running_timer, + base->running_timer != timer); +} + /** * mod_timer - modify a timer's timeout * @timer: the timer to be modified @@ -667,7 +680,35 @@ int del_timer(struct timer_list *timer) EXPORT_SYMBOL(del_timer); -#ifdef CONFIG_SMP +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_SOFTIRQS) +/* + * This function checks whether a timer is active and not running on any + * CPU. Upon successful (ret >= 0) exit the timer is not queued and the + * handler is not running on any CPU. + * + * It must not be called from interrupt contexts. + */ +int timer_pending_sync(struct timer_list *timer) +{ + struct tvec_base *base; + unsigned long flags; + int ret = -1; + + base = lock_timer_base(timer, &flags); + + if (base->running_timer == timer) + goto out; + + ret = 0; + if (timer_pending(timer)) + ret = 1; +out: + spin_unlock_irqrestore(&base->lock, flags); + + return ret; +} + + /** * try_to_del_timer_sync - Try to deactivate a timer * @timer: timer do del @@ -724,7 +765,7 @@ int del_timer_sync(struct timer_list *ti int ret = try_to_del_timer_sync(timer); if (ret >= 0) return ret; - cpu_relax(); + wait_for_running_timer(timer); } } @@ -770,6 +811,20 @@ static inline void __run_timers(struct t struct list_head *head = &work_list; int index = base->timer_jiffies & TVR_MASK; + if (softirq_need_resched()) { + spin_unlock_irq(&base->lock); + wake_up(&base->wait_for_running_timer); + cond_resched_softirq_context(); + cpu_relax(); + spin_lock_irq(&base->lock); + /* + * We can simply continue after preemption, nobody + * else can touch timer_jiffies so 'index' is still + * valid. Any new jiffy will be taken care of in + * subsequent loops: + */ + } + /* * Cascade timers: */ @@ -797,18 +852,17 @@ static inline void __run_timers(struct t int preempt_count = preempt_count(); fn(data); if (preempt_count != preempt_count()) { - printk(KERN_ERR "huh, entered %p " - "with preempt_count %08x, exited" - " with %08x?\n", - fn, preempt_count, - preempt_count()); - BUG(); + print_symbol("BUG: unbalanced timer-handler preempt count in %s!\n", (unsigned long) fn); + printk("entered with %08x, exited with %08x.\n", preempt_count, preempt_count()); + preempt_count() = preempt_count; } } + set_running_timer(base, NULL); + cond_resched_softirq_context(); spin_lock_irq(&base->lock); } } - set_running_timer(base, NULL); + wake_up(&base->wait_for_running_timer); spin_unlock_irq(&base->lock); } @@ -983,10 +1037,10 @@ void update_process_times(int user_tick) /* Note: this timer irq context must be accounted for as well. */ account_process_tick(p, user_tick); + scheduler_tick(); run_local_timers(); if (rcu_pending(cpu)) rcu_check_callbacks(cpu, user_tick); - scheduler_tick(); run_posix_cpu_timers(p); } @@ -1032,19 +1086,6 @@ static inline void calc_load(unsigned lo } /* - * This function runs timers and the timer-tq in bottom half context. - */ -static void run_timer_softirq(struct softirq_action *h) -{ - struct tvec_base *base = __get_cpu_var(tvec_bases); - - hrtimer_run_pending(); - - if (time_after_eq(jiffies, base->timer_jiffies)) - __run_timers(base); -} - -/* * Called by the local, per-CPU timer interrupt on SMP. */ void run_local_timers(void) @@ -1055,13 +1096,36 @@ void run_local_timers(void) } /* - * Called by the timer interrupt. xtime_lock must already be taken - * by the timer IRQ! + * Time of day handling: */ -static inline void update_times(unsigned long ticks) +static inline void update_times(void) { - update_wall_time(); - calc_load(ticks); + static unsigned long last_tick = INITIAL_JIFFIES; + unsigned long ticks, flags; + + write_seqlock_irqsave(&xtime_lock, flags); + ticks = jiffies - last_tick; + if (ticks) { + last_tick += ticks; + update_wall_time(); + calc_load(ticks); + } + write_sequnlock_irqrestore(&xtime_lock, flags); +} + + +/* + * This function runs timers and the timer-tq in bottom half context. + */ +static void run_timer_softirq(struct softirq_action *h) +{ + struct tvec_base *base = __get_cpu_var(tvec_bases); + + update_times(); + hrtimer_run_pending(); + + if (time_after_eq(jiffies, base->timer_jiffies)) + __run_timers(base); } /* @@ -1073,7 +1137,6 @@ static inline void update_times(unsigned void do_timer(unsigned long ticks) { jiffies_64 += ticks; - update_times(ticks); } #ifdef __ARCH_WANT_SYS_ALARM @@ -1407,6 +1470,7 @@ static int __cpuinit init_timers_cpu(int } spin_lock_init(&base->lock); + init_waitqueue_head(&base->wait_for_running_timer); for (j = 0; j < TVN_SIZE; j++) { INIT_LIST_HEAD(base->tv5.vec + j); patches/preempt-irqs-hrtimer.patch0000664000076400007640000001013411043564045016357 0ustar tglxtglx include/linux/hrtimer.h | 10 ++++++++++ kernel/hrtimer.c | 33 ++++++++++++++++++++++++++++++++- kernel/itimer.c | 1 + kernel/posix-timers.c | 3 +++ 4 files changed, 46 insertions(+), 1 deletion(-) Index: linux-2.6.26/include/linux/hrtimer.h =================================================================== --- linux-2.6.26.orig/include/linux/hrtimer.h +++ linux-2.6.26/include/linux/hrtimer.h @@ -195,6 +195,9 @@ struct hrtimer_cpu_base { int hres_active; unsigned long nr_events; #endif +#ifdef CONFIG_PREEMPT_SOFTIRQS + wait_queue_head_t wait; +#endif }; #ifdef CONFIG_HIGH_RES_TIMERS @@ -292,6 +295,13 @@ static inline int hrtimer_restart(struct return hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS); } +/* Softirq preemption could deadlock timer removal */ +#ifdef CONFIG_PREEMPT_SOFTIRQS + extern void hrtimer_wait_for_timer(const struct hrtimer *timer); +#else +# define hrtimer_wait_for_timer(timer) do { cpu_relax(); } while (0) +#endif + /* Query timers: */ extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer); extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp); Index: linux-2.6.26/kernel/hrtimer.c =================================================================== --- linux-2.6.26.orig/kernel/hrtimer.c +++ linux-2.6.26/kernel/hrtimer.c @@ -1088,7 +1088,7 @@ int hrtimer_cancel(struct hrtimer *timer if (ret >= 0) return ret; - cpu_relax(); + hrtimer_wait_for_timer(timer); } } EXPORT_SYMBOL_GPL(hrtimer_cancel); @@ -1207,6 +1207,32 @@ int hrtimer_get_res(const clockid_t whic } EXPORT_SYMBOL_GPL(hrtimer_get_res); +#ifdef CONFIG_PREEMPT_SOFTIRQS +# define wake_up_timer_waiters(b) wake_up(&(b)->wait) + +/** + * hrtimer_wait_for_timer - Wait for a running timer + * + * @timer: timer to wait for + * + * The function waits in case the timers callback function is + * currently executed on the waitqueue of the timer base. The + * waitqueue is woken up after the timer callback function has + * finished execution. + */ +void hrtimer_wait_for_timer(const struct hrtimer *timer) +{ + struct hrtimer_clock_base *base = timer->base; + + if (base && base->cpu_base) + wait_event(base->cpu_base->wait, + !(timer->state & HRTIMER_STATE_CALLBACK)); +} + +#else +# define wake_up_timer_waiters(b) do { } while (0) +#endif + static void run_hrtimer_pending(struct hrtimer_cpu_base *cpu_base) { spin_lock_irq(&cpu_base->lock); @@ -1259,6 +1285,8 @@ static void run_hrtimer_pending(struct h } } spin_unlock_irq(&cpu_base->lock); + + wake_up_timer_waiters(cpu_base); } static void __run_hrtimer(struct hrtimer *timer) @@ -1618,6 +1646,9 @@ static void __cpuinit init_hrtimers_cpu( INIT_LIST_HEAD(&cpu_base->cb_pending); hrtimer_init_hres(cpu_base); +#ifdef CONFIG_PREEMPT_SOFTIRQS + init_waitqueue_head(&cpu_base->wait); +#endif } #ifdef CONFIG_HOTPLUG_CPU Index: linux-2.6.26/kernel/itimer.c =================================================================== --- linux-2.6.26.orig/kernel/itimer.c +++ linux-2.6.26/kernel/itimer.c @@ -170,6 +170,7 @@ again: /* We are sharing ->siglock with it_real_fn() */ if (hrtimer_try_to_cancel(timer) < 0) { spin_unlock_irq(&tsk->sighand->siglock); + hrtimer_wait_for_timer(&tsk->signal->real_timer); goto again; } expires = timeval_to_ktime(value->it_value); Index: linux-2.6.26/kernel/posix-timers.c =================================================================== --- linux-2.6.26.orig/kernel/posix-timers.c +++ linux-2.6.26/kernel/posix-timers.c @@ -807,6 +807,7 @@ retry: unlock_timer(timr, flag); if (error == TIMER_RETRY) { + hrtimer_wait_for_timer(&timr->it.real.timer); rtn = NULL; // We already got the old time... goto retry; } @@ -846,6 +847,7 @@ retry_delete: if (timer_delete_hook(timer) == TIMER_RETRY) { unlock_timer(timer, flags); + hrtimer_wait_for_timer(&timer->it.real.timer); goto retry_delete; } @@ -878,6 +880,7 @@ retry_delete: if (timer_delete_hook(timer) == TIMER_RETRY) { unlock_timer(timer, flags); + hrtimer_wait_for_timer(&timer->it.real.timer); goto retry_delete; } list_del(&timer->list); patches/preempt-irqs-i386.patch0000664000076400007640000001164611043564045015407 0ustar tglxtglx--- arch/x86/kernel/i8259_32.c | 11 +++++++---- arch/x86/kernel/io_apic_32.c | 20 +++++--------------- arch/x86/mach-default/setup.c | 3 ++- arch/x86/mach-visws/visws_apic.c | 2 ++ arch/x86/mach-voyager/setup.c | 3 ++- 5 files changed, 18 insertions(+), 21 deletions(-) Index: linux-2.6.26/arch/x86/kernel/i8259_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/i8259_32.c +++ linux-2.6.26/arch/x86/kernel/i8259_32.c @@ -165,6 +165,8 @@ static void mask_and_ack_8259A(unsigned */ if (cached_irq_mask & irqmask) goto spurious_8259A_irq; + if (irq & 8) + outb(0x60+(irq&7),PIC_SLAVE_CMD); /* 'Specific EOI' to slave */ cached_irq_mask |= irqmask; handle_real_irq: @@ -292,10 +294,10 @@ void init_8259A(int auto_eoi) outb_pic(0x11, PIC_MASTER_CMD); /* ICW1: select 8259A-1 init */ outb_pic(0x20 + 0, PIC_MASTER_IMR); /* ICW2: 8259A-1 IR0-7 mapped to 0x20-0x27 */ outb_pic(1U << PIC_CASCADE_IR, PIC_MASTER_IMR); /* 8259A-1 (the master) has a slave on IR2 */ - if (auto_eoi) /* master does Auto EOI */ - outb_pic(MASTER_ICW4_DEFAULT | PIC_ICW4_AEOI, PIC_MASTER_IMR); - else /* master expects normal EOI */ - outb_pic(MASTER_ICW4_DEFAULT, PIC_MASTER_IMR); + if (!auto_eoi) /* master expects normal EOI */ + outb_p(MASTER_ICW4_DEFAULT, PIC_MASTER_IMR); + else /* master does Auto EOI */ + outb_p(MASTER_ICW4_DEFAULT | PIC_ICW4_AEOI, PIC_MASTER_IMR); outb_pic(0x11, PIC_SLAVE_CMD); /* ICW1: select 8259A-2 init */ outb_pic(0x20 + 8, PIC_SLAVE_IMR); /* ICW2: 8259A-2 IR0-7 mapped to 0x28-0x2f */ @@ -347,6 +349,7 @@ static irqreturn_t math_error_irq(int cp */ static struct irqaction fpu_irq = { .handler = math_error_irq, + .flags = IRQF_NODELAY, .mask = CPU_MASK_NONE, .name = "fpu", }; Index: linux-2.6.26/arch/x86/kernel/io_apic_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/io_apic_32.c +++ linux-2.6.26/arch/x86/kernel/io_apic_32.c @@ -270,18 +270,6 @@ static void __unmask_IO_APIC_irq (unsign __modify_IO_APIC_irq(irq, 0, 0x00010000); } -/* mask = 1, trigger = 0 */ -static void __mask_and_edge_IO_APIC_irq (unsigned int irq) -{ - __modify_IO_APIC_irq(irq, 0x00010000, 0x00008000); -} - -/* mask = 0, trigger = 1 */ -static void __unmask_and_level_IO_APIC_irq (unsigned int irq) -{ - __modify_IO_APIC_irq(irq, 0x00008000, 0x00010000); -} - static void mask_IO_APIC_irq (unsigned int irq) { unsigned long flags; @@ -1457,7 +1445,7 @@ void __init print_IO_APIC(void) return; } -#if 0 +#if 1 static void print_APIC_bitfield (int base) { @@ -1954,8 +1942,10 @@ static void ack_ioapic_quirk_irq(unsigne if (!(v & (1 << (i & 0x1f)))) { atomic_inc(&irq_mis_count); spin_lock(&ioapic_lock); - __mask_and_edge_IO_APIC_irq(irq); - __unmask_and_level_IO_APIC_irq(irq); + /* mask = 1, trigger = 0 */ + __modify_IO_APIC_irq(irq, 0x00010000, 0x00008000); + /* mask = 0, trigger = 1 */ + __modify_IO_APIC_irq(irq, 0x00008000, 0x00010000); spin_unlock(&ioapic_lock); } } Index: linux-2.6.26/arch/x86/mach-default/setup.c =================================================================== --- linux-2.6.26.orig/arch/x86/mach-default/setup.c +++ linux-2.6.26/arch/x86/mach-default/setup.c @@ -37,6 +37,7 @@ void __init pre_intr_init_hook(void) */ static struct irqaction irq2 = { .handler = no_action, + .flags = IRQF_NODELAY, .mask = CPU_MASK_NONE, .name = "cascade", }; @@ -85,7 +86,7 @@ void __init trap_init_hook(void) static struct irqaction irq0 = { .handler = timer_interrupt, - .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL, + .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_NODELAY, .mask = CPU_MASK_NONE, .name = "timer" }; Index: linux-2.6.26/arch/x86/mach-visws/visws_apic.c =================================================================== --- linux-2.6.26.orig/arch/x86/mach-visws/visws_apic.c +++ linux-2.6.26/arch/x86/mach-visws/visws_apic.c @@ -255,11 +255,13 @@ out_unlock: static struct irqaction master_action = { .handler = piix4_master_intr, .name = "PIIX4-8259", + .flags = IRQF_NODELAY, }; static struct irqaction cascade_action = { .handler = no_action, .name = "cascade", + .flags = IRQF_NODELAY, }; Index: linux-2.6.26/arch/x86/mach-voyager/setup.c =================================================================== --- linux-2.6.26.orig/arch/x86/mach-voyager/setup.c +++ linux-2.6.26/arch/x86/mach-voyager/setup.c @@ -20,6 +20,7 @@ void __init pre_intr_init_hook(void) */ static struct irqaction irq2 = { .handler = no_action, + .flags = IRQF_NODELAY, .mask = CPU_MASK_NONE, .name = "cascade", }; @@ -46,7 +47,7 @@ void __init trap_init_hook(void) static struct irqaction irq0 = { .handler = timer_interrupt, - .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL, + .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_NODELAY, .mask = CPU_MASK_NONE, .name = "timer" }; patches/preempt-irqs-i386-ioapic-mask-quirk.patch0000664000076400007640000001370411043564045020730 0ustar tglxtglxFrom mschmidt@redhat.com Thu Jun 21 13:32:02 2007 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [66.187.233.31]) by mail.tglx.de (Postfix) with ESMTP id CA11565C065 for ; Thu, 21 Jun 2007 13:32:02 +0200 (CEST) Received: from int-mx1.corp.redhat.com (int-mx1.corp.redhat.com [172.16.52.254]) by mx1.redhat.com (8.13.1/8.13.1) with ESMTP id l5LBVoq3016914; Thu, 21 Jun 2007 07:31:50 -0400 Received: from pobox.stuttgart.redhat.com (pobox.stuttgart.redhat.com [172.16.2.10]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id l5LBVmp0010104; Thu, 21 Jun 2007 07:31:49 -0400 Received: from [10.34.32.84] (brian.englab.brq.redhat.com [10.34.32.84]) by pobox.stuttgart.redhat.com (8.12.11.20060308/8.12.11) with ESMTP id l5LBVl5k000423; Thu, 21 Jun 2007 13:31:47 +0200 Message-ID: <467A61A3.7060804@redhat.com> Date: Thu, 21 Jun 2007 13:31:47 +0200 From: Michal Schmidt User-Agent: Thunderbird 1.5.0.12 (X11/20070529) MIME-Version: 1.0 To: Steven Rostedt CC: Ingo Molnar , Thomas Gleixner , linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH -rt] irq nobody cared workaround for i386 References: <4676CF81.2000205@redhat.com> <4677D7AF.7040700@redhat.com> <467932B4.6030800@redhat.com> <467936FE.8050704@redhat.com> In-Reply-To: <467936FE.8050704@redhat.com> X-Enigmail-Version: 0.94.2.0 Content-Type: text/plain; charset=ISO-8859-1 X-Evolution-Source: imap://tglx%40linutronix.de@localhost:8993/ Content-Transfer-Encoding: 8bit Steven Rostedt wrote: > Michal Schmidt wrote: > >> I came to the conclusion that the IO-APICs which need the fix for the >> nobody cared bug don't have the issue ack_ioapic_quirk_irq is designed >> to work-around. It should be safe simply to use the normal >> ack_ioapic_irq as the .eoi method in pcix_ioapic_chip. >> So this is the port of Steven's fix for the nobody cared bug to i386. It >> works fine on IBM LS21 I have access to. >> >> > You want to make that "apic > 0". Note the spacing. If it breaks > 80 characters, then simply put it to a new line. > > [...] > ACK > > -- Steve > OK, I fixed the spacing in both occurences. Signed-off-by: Michal Schmidt --- arch/x86/kernel/io_apic_32.c | 62 ++++++++++++++++++++++++++++++++++++++----- 1 file changed, 55 insertions(+), 7 deletions(-) Index: linux-2.6.26/arch/x86/kernel/io_apic_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/io_apic_32.c +++ linux-2.6.26/arch/x86/kernel/io_apic_32.c @@ -270,6 +270,18 @@ static void __unmask_IO_APIC_irq (unsign __modify_IO_APIC_irq(irq, 0, 0x00010000); } +/* trigger = 0 (edge mode) */ +static void __pcix_mask_IO_APIC_irq (unsigned int irq) +{ + __modify_IO_APIC_irq(irq, 0, 0x00008000); +} + +/* mask = 0, trigger = 1 (level mode) */ +static void __pcix_unmask_IO_APIC_irq (unsigned int irq) +{ + __modify_IO_APIC_irq(irq, 0x00008000, 0x00010000); +} + static void mask_IO_APIC_irq (unsigned int irq) { unsigned long flags; @@ -288,6 +300,24 @@ static void unmask_IO_APIC_irq (unsigned spin_unlock_irqrestore(&ioapic_lock, flags); } +static void pcix_mask_IO_APIC_irq (unsigned int irq) +{ + unsigned long flags; + + spin_lock_irqsave(&ioapic_lock, flags); + __pcix_mask_IO_APIC_irq(irq); + spin_unlock_irqrestore(&ioapic_lock, flags); +} + +static void pcix_unmask_IO_APIC_irq (unsigned int irq) +{ + unsigned long flags; + + spin_lock_irqsave(&ioapic_lock, flags); + __pcix_unmask_IO_APIC_irq(irq); + spin_unlock_irqrestore(&ioapic_lock, flags); +} + static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin) { struct IO_APIC_route_entry entry; @@ -1191,23 +1221,28 @@ static int assign_irq_vector(int irq) return vector; } + static struct irq_chip ioapic_chip; +static struct irq_chip pcix_ioapic_chip; #define IOAPIC_AUTO -1 #define IOAPIC_EDGE 0 #define IOAPIC_LEVEL 1 -static void ioapic_register_intr(int irq, int vector, unsigned long trigger) +static void ioapic_register_intr(int irq, int vector, unsigned long trigger, + int pcix) { + struct irq_chip *chip = pcix ? &pcix_ioapic_chip : &ioapic_chip; + if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) || trigger == IOAPIC_LEVEL) { irq_desc[irq].status |= IRQ_LEVEL; - set_irq_chip_and_handler_name(irq, &ioapic_chip, - handle_fasteoi_irq, "fasteoi"); + set_irq_chip_and_handler_name(irq, chip, handle_fasteoi_irq, + pcix ? "pcix-fasteoi" : "fasteoi"); } else { irq_desc[irq].status &= ~IRQ_LEVEL; - set_irq_chip_and_handler_name(irq, &ioapic_chip, - handle_edge_irq, "edge"); + set_irq_chip_and_handler_name(irq, chip, handle_edge_irq, + pcix ? "pcix-edge" : "edge"); } set_intr_gate(vector, interrupt[irq]); } @@ -1276,7 +1311,8 @@ static void __init setup_IO_APIC_irqs(vo if (IO_APIC_IRQ(irq)) { vector = assign_irq_vector(irq); entry.vector = vector; - ioapic_register_intr(irq, vector, IOAPIC_AUTO); + ioapic_register_intr(irq, vector, IOAPIC_AUTO, + apic > 0); if (!apic && (irq < 16)) disable_8259A_irq(irq); @@ -1970,6 +2006,18 @@ static struct irq_chip ioapic_chip __rea .retrigger = ioapic_retrigger_irq, }; +static struct irq_chip pcix_ioapic_chip __read_mostly = { + .name = "IO-APIC", + .startup = startup_ioapic_irq, + .mask = pcix_mask_IO_APIC_irq, + .unmask = pcix_unmask_IO_APIC_irq, + .ack = ack_ioapic_irq, + .eoi = ack_ioapic_irq, +#ifdef CONFIG_SMP + .set_affinity = set_ioapic_affinity_irq, +#endif + .retrigger = ioapic_retrigger_irq, +}; static inline void init_IO_APIC_traps(void) { @@ -2775,7 +2823,7 @@ int io_apic_set_pci_routing (int ioapic, mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq, edge_level, active_high_low); - ioapic_register_intr(irq, entry.vector, edge_level); + ioapic_register_intr(irq, entry.vector, edge_level, ioapic > 0); if (!ioapic && (irq < 16)) disable_8259A_irq(irq); patches/preempt-irqs-mips.patch0000664000076400007640000000107011043564045015654 0ustar tglxtglx--- arch/mips/kernel/i8253.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/arch/mips/kernel/i8253.c =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/i8253.c +++ linux-2.6.26/arch/mips/kernel/i8253.c @@ -97,7 +97,7 @@ static irqreturn_t timer_interrupt(int i static struct irqaction irq0 = { .handler = timer_interrupt, - .flags = IRQF_DISABLED | IRQF_NOBALANCING, + .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_NODELAY, .mask = CPU_MASK_NONE, .name = "timer" }; patches/preempt-irqs-x86-64.patch0000664000076400007640000000203511043564045015562 0ustar tglxtglx--- arch/x86/kernel/i8259_64.c | 1 + arch/x86/kernel/time_64.c | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-) Index: linux-2.6.26/arch/x86/kernel/i8259_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/i8259_64.c +++ linux-2.6.26/arch/x86/kernel/i8259_64.c @@ -405,6 +405,7 @@ void init_8259A(int auto_eoi) static struct irqaction irq2 = { .handler = no_action, + .flags = IRQF_NODELAY, .mask = CPU_MASK_NONE, .name = "cascade", }; Index: linux-2.6.26/arch/x86/kernel/time_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/time_64.c +++ linux-2.6.26/arch/x86/kernel/time_64.c @@ -101,7 +101,8 @@ unsigned long __init native_calculate_cp static struct irqaction irq0 = { .handler = timer_event_interrupt, - .flags = IRQF_DISABLED | IRQF_IRQPOLL | IRQF_NOBALANCING, + .flags = IRQF_DISABLED | IRQF_IRQPOLL | IRQF_NOBALANCING | + IRQF_NODELAY, .mask = CPU_MASK_NONE, .name = "timer" }; patches/preempt-irqs-x86-64-ioapic-mask-quirk.patch0000664000076400007640000000651211043564044021111 0ustar tglxtglx--- arch/x86/kernel/io_apic_64.c | 62 +++++++++++++++++++++++++++++++++---------- 1 file changed, 49 insertions(+), 13 deletions(-) Index: linux-2.6.26/arch/x86/kernel/io_apic_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/io_apic_64.c +++ linux-2.6.26/arch/x86/kernel/io_apic_64.c @@ -371,6 +371,9 @@ DO_ACTION( __mask, 0, |= 0x0 DO_ACTION( __unmask, 0, &= 0xfffeffff, ) /* mask = 0 */ +DO_ACTION( __pcix_mask, 0, &= 0xffff7fff, ) /* edge */ +DO_ACTION( __pcix_unmask, 0, = (reg & 0xfffeffff) | 0x00008000, ) /* level */ + static void mask_IO_APIC_irq (unsigned int irq) { unsigned long flags; @@ -388,6 +391,23 @@ static void unmask_IO_APIC_irq (unsigned __unmask_IO_APIC_irq(irq); spin_unlock_irqrestore(&ioapic_lock, flags); } +static void pcix_mask_IO_APIC_irq (unsigned int irq) +{ + unsigned long flags; + + spin_lock_irqsave(&ioapic_lock, flags); + __pcix_mask_IO_APIC_irq(irq); + spin_unlock_irqrestore(&ioapic_lock, flags); +} + +static void pcix_unmask_IO_APIC_irq (unsigned int irq) +{ + unsigned long flags; + + spin_lock_irqsave(&ioapic_lock, flags); + __pcix_unmask_IO_APIC_irq(irq); + spin_unlock_irqrestore(&ioapic_lock, flags); +} static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin) { @@ -813,17 +833,20 @@ void __setup_vector_irq(int cpu) static struct irq_chip ioapic_chip; +static struct irq_chip pcix_ioapic_chip; -static void ioapic_register_intr(int irq, unsigned long trigger) +static void ioapic_register_intr(int irq, unsigned long trigger, int pcix) { + struct irq_chip *chip = pcix ? &pcix_ioapic_chip : &ioapic_chip; + if (trigger) { irq_desc[irq].status |= IRQ_LEVEL; - set_irq_chip_and_handler_name(irq, &ioapic_chip, - handle_fasteoi_irq, "fasteoi"); + set_irq_chip_and_handler_name(irq, chip, handle_fasteoi_irq, + pcix ? "pcix-fasteoi" : "fasteoi"); } else { irq_desc[irq].status &= ~IRQ_LEVEL; - set_irq_chip_and_handler_name(irq, &ioapic_chip, - handle_edge_irq, "edge"); + set_irq_chip_and_handler_name(irq, chip, handle_edge_irq, + pcix ? "pcix-edge" : "edge"); } } @@ -868,7 +891,7 @@ static void setup_IO_APIC_irq(int apic, if (trigger) entry.mask = 1; - ioapic_register_intr(irq, trigger); + ioapic_register_intr(irq, trigger, apic > 0); if (irq < 16) disable_8259A_irq(irq); @@ -1498,14 +1521,27 @@ static void ack_apic_level(unsigned int } static struct irq_chip ioapic_chip __read_mostly = { - .name = "IO-APIC", - .startup = startup_ioapic_irq, - .mask = mask_IO_APIC_irq, - .unmask = unmask_IO_APIC_irq, - .ack = ack_apic_edge, - .eoi = ack_apic_level, + .name = "IO-APIC", + .startup = startup_ioapic_irq, + .mask = mask_IO_APIC_irq, + .unmask = unmask_IO_APIC_irq, + .ack = ack_apic_edge, + .eoi = ack_apic_level, +#ifdef CONFIG_SMP + .set_affinity = set_ioapic_affinity_irq, +#endif + .retrigger = ioapic_retrigger_irq, +}; + +static struct irq_chip pcix_ioapic_chip __read_mostly = { + .name = "IO-APIC", + .startup = startup_ioapic_irq, + .mask = pcix_mask_IO_APIC_irq, + .unmask = pcix_unmask_IO_APIC_irq, + .ack = ack_apic_edge, + .eoi = ack_apic_level, #ifdef CONFIG_SMP - .set_affinity = set_ioapic_affinity_irq, + .set_affinity = set_ioapic_affinity_irq, #endif .retrigger = ioapic_retrigger_irq, }; patches/preempt-irqs-arm.patch0000664000076400007640000000103211043564044015460 0ustar tglxtglx--- arch/arm/common/time-acorn.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/arch/arm/common/time-acorn.c =================================================================== --- linux-2.6.26.orig/arch/arm/common/time-acorn.c +++ linux-2.6.26/arch/arm/common/time-acorn.c @@ -75,7 +75,7 @@ ioc_timer_interrupt(int irq, void *dev_i static struct irqaction ioc_timer_irq = { .name = "timer", - .flags = IRQF_DISABLED, + .flags = IRQF_DISABLED | IRQF_NODELAY, .handler = ioc_timer_interrupt }; patches/preempt-irqs-arm-fix-oprofile.patch0000664000076400007640000000153711043564044020073 0ustar tglxtglxConvert XScale performance monitor unit (PMU) interrupt used by oprofile to IRQF_NODELAY. PMU results not useful if ISR is run as thread. Signed-off-by: Kevin Hilman arch/arm/oprofile/op_model_xscale.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: linux-2.6.26/arch/arm/oprofile/op_model_xscale.c =================================================================== --- linux-2.6.26.orig/arch/arm/oprofile/op_model_xscale.c +++ linux-2.6.26/arch/arm/oprofile/op_model_xscale.c @@ -381,8 +381,9 @@ static int xscale_pmu_start(void) { int ret; u32 pmnc = read_pmnc(); + int irq_flags = IRQF_DISABLED | IRQF_NODELAY; - ret = request_irq(XSCALE_PMU_IRQ, xscale_pmu_interrupt, IRQF_DISABLED, + ret = request_irq(XSCALE_PMU_IRQ, xscale_pmu_interrupt, irq_flags, "XScale PMU", (void *)results); if (ret < 0) { patches/preempt-irqs-ppc.patch0000664000076400007640000000326711043564044015477 0ustar tglxtglx--- arch/powerpc/kernel/entry_32.S | 4 ++-- arch/powerpc/kernel/irq.c | 1 - arch/powerpc/kernel/ppc_ksyms.c | 1 - 3 files changed, 2 insertions(+), 4 deletions(-) Index: linux-2.6.26/arch/powerpc/kernel/entry_32.S =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/entry_32.S +++ linux-2.6.26/arch/powerpc/kernel/entry_32.S @@ -910,7 +910,7 @@ global_dbcr0: #endif /* !(CONFIG_4xx || CONFIG_BOOKE) */ do_work: /* r10 contains MSR_KERNEL here */ - andi. r0,r9,_TIF_NEED_RESCHED + andi. r0,r9,(_TIF_NEED_RESCHED) beq do_user_signal do_resched: /* r10 contains MSR_KERNEL here */ @@ -924,7 +924,7 @@ recheck: MTMSRD(r10) /* disable interrupts */ rlwinm r9,r1,0,0,(31-THREAD_SHIFT) lwz r9,TI_FLAGS(r9) - andi. r0,r9,_TIF_NEED_RESCHED + andi. r0,r9,(_TIF_NEED_RESCHED) bne- do_resched andi. r0,r9,_TIF_SIGPENDING|_TIF_RESTORE_SIGMASK beq restore_user Index: linux-2.6.26/arch/powerpc/kernel/irq.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/irq.c +++ linux-2.6.26/arch/powerpc/kernel/irq.c @@ -94,7 +94,6 @@ extern atomic_t ipi_sent; #endif #ifdef CONFIG_PPC64 -EXPORT_SYMBOL(irq_desc); int distribute_irqs = 1; Index: linux-2.6.26/arch/powerpc/kernel/ppc_ksyms.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/ppc_ksyms.c +++ linux-2.6.26/arch/powerpc/kernel/ppc_ksyms.c @@ -157,7 +157,6 @@ EXPORT_SYMBOL(screen_info); #ifdef CONFIG_PPC32 EXPORT_SYMBOL(timer_interrupt); -EXPORT_SYMBOL(irq_desc); EXPORT_SYMBOL(tb_ticks_per_jiffy); EXPORT_SYMBOL(cacheable_memcpy); #endif patches/preempt-irqs-ppc-ack-irq-fixups.patch0000664000076400007640000000534211043564044020334 0ustar tglxtglxAs fasteoi type chips never had to define their ack() method before the recent Ingo's change to handle_fasteoi_irq(), any attempt to execute handler in thread resulted in the kernel crash. So, define their ack() methods to be the same as their eoi() ones... Signed-off-by: Sergei Shtylyov --- Since there was no feedback on three solutions I suggested, I'm going the way of least resistance and making the fasteoi type chips behave the way that handle_fasteoi_irq() is expecting from them... arch/powerpc/platforms/cell/interrupt.c | 1 + arch/powerpc/platforms/iseries/irq.c | 1 + arch/powerpc/platforms/pseries/xics.c | 2 ++ arch/powerpc/sysdev/mpic.c | 1 + 4 files changed, 5 insertions(+) Index: linux-2.6.26/arch/powerpc/platforms/cell/interrupt.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/cell/interrupt.c +++ linux-2.6.26/arch/powerpc/platforms/cell/interrupt.c @@ -91,6 +91,7 @@ static struct irq_chip iic_chip = { .typename = " CELL-IIC ", .mask = iic_mask, .unmask = iic_unmask, + .ack = iic_eoi, .eoi = iic_eoi, }; Index: linux-2.6.26/arch/powerpc/platforms/iseries/irq.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/iseries/irq.c +++ linux-2.6.26/arch/powerpc/platforms/iseries/irq.c @@ -278,6 +278,7 @@ static struct irq_chip iseries_pic = { .shutdown = iseries_shutdown_IRQ, .unmask = iseries_enable_IRQ, .mask = iseries_disable_IRQ, + .ack = iseries_end_IRQ, .eoi = iseries_end_IRQ }; Index: linux-2.6.26/arch/powerpc/platforms/pseries/xics.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/pseries/xics.c +++ linux-2.6.26/arch/powerpc/platforms/pseries/xics.c @@ -501,6 +501,7 @@ static struct irq_chip xics_pic_direct = .startup = xics_startup, .mask = xics_mask_irq, .unmask = xics_unmask_irq, + .ack = xics_eoi_direct, .eoi = xics_eoi_direct, .set_affinity = xics_set_affinity }; @@ -511,6 +512,7 @@ static struct irq_chip xics_pic_lpar = { .startup = xics_startup, .mask = xics_mask_irq, .unmask = xics_unmask_irq, + .ack = xics_eoi_lpar, .eoi = xics_eoi_lpar, .set_affinity = xics_set_affinity }; Index: linux-2.6.26/arch/powerpc/sysdev/mpic.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/sysdev/mpic.c +++ linux-2.6.26/arch/powerpc/sysdev/mpic.c @@ -867,6 +867,7 @@ void mpic_set_vector(unsigned int virq, static struct irq_chip mpic_irq_chip = { .mask = mpic_mask_irq, .unmask = mpic_unmask_irq, + .ack = mpic_end_irq, .eoi = mpic_end_irq, .set_type = mpic_set_irq_type, }; patches/preempt-irqs-ppc-fix-b5.patch0000664000076400007640000000314711043564044016564 0ustar tglxtglx To fix the following boot time error by removing ack member added by the rt patch. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Processor 1 found. Brought up 2 CPUs ------------[ cut here ]------------ kernel BUG at arch/powerpc/platforms/cell/interrupt.c:86! pu 0x1: Vector: 700 (Program Check) at [c00000000fff3c80] pc: c000000000033f9c: .iic_eoi+0x58/0x64 lr: c00000000009add8: .handle_percpu_irq+0xd4/0xf4 sp: c00000000fff3f00 msr: 9000000000021032 current = 0xc000000000fee040 paca = 0xc000000000509e80 pid = 0, comm = swapper kernel BUG at arch/powerpc/platforms/cell/interrupt.c:86! enter ? for help [link register ] c00000000009add8 .handle_percpu_irq+0xd4/0xf4 [c00000000fff3f00] c00000000009ada8 .handle_percpu_irq+0xa4/0xf4 (unreliable) [c00000000fff3f90] c000000000023bb8 .call_handle_irq+0x1c/0x2c [c000000000ff7950] c00000000000c910 .do_IRQ+0xf8/0x1b8 [c000000000ff79f0] c000000000034f34 .cbe_system_reset_exception+0x74/0xb4 [c000000000ff7a70] c000000000022610 .system_reset_exception+0x40/0xe0 [c000000000ff7af0] c000000000003378 system_reset_common+0xf8/0x100 --- arch/powerpc/platforms/cell/interrupt.c | 1 - 1 file changed, 1 deletion(-) Index: linux-2.6.26/arch/powerpc/platforms/cell/interrupt.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/cell/interrupt.c +++ linux-2.6.26/arch/powerpc/platforms/cell/interrupt.c @@ -91,7 +91,6 @@ static struct irq_chip iic_chip = { .typename = " CELL-IIC ", .mask = iic_mask, .unmask = iic_unmask, - .ack = iic_eoi, .eoi = iic_eoi, }; patches/preempt-irqs-ppc-fix-b6.patch0000664000076400007640000000265611043564043016570 0ustar tglxtglx To fix the following boot time warnings by setting soft_enabled and hard_enabled. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Freeing unused kernel memory: 248k freed BUG: scheduling with irqs disabled: rc.sysinit/0x00000000/373 caller is user_work+0x14/0x2c Call Trace: [C00000001FEC3D10] [C00000000000FAA0] .show_stack+0x68/0x1b0 (unreliable) [C00000001FEC3DB0] [C0000000003E78DC] .schedule+0x78/0x128 [C00000001FEC3E30] [C000000000008C40] user_work+0x14/0x2c BUG: scheduling with irqs disabled: sed/0x00000000/378 caller is user_work+0x14/0x2c Call Trace: [C00000000FA33D10] [C00000000000FAA0] .show_stack+0x68/0x1b0 (unreliable) [C00000000FA33DB0] [C0000000003E78DC] .schedule+0x78/0x128 [C00000000FA33E30] [C000000000008C40] user_work+0x14/0x2c - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Signed-off-by: Tsutomu Owa -- owa --- arch/powerpc/kernel/entry_64.S | 5 +++++ 1 file changed, 5 insertions(+) Index: linux-2.6.26/arch/powerpc/kernel/entry_64.S =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/entry_64.S +++ linux-2.6.26/arch/powerpc/kernel/entry_64.S @@ -623,6 +623,11 @@ do_work: user_work: #endif + /* here we are preempting the current task */ + li r0,1 + stb r0,PACASOFTIRQEN(r13) + stb r0,PACAHARDIRQEN(r13) + /* Enable interrupts */ ori r10,r10,MSR_EE mtmsrd r10,1 patches/preempt-irqs-ppc-fix-more-fasteoi.patch0000664000076400007640000000677211043564043020656 0ustar tglxtglxFrom sshtylyov@ru.mvista.com Thu May 17 15:18:39 2007 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.1.7-deb (2006-10-05) on debian X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=AWL autolearn=unavailable version=3.1.7-deb Received: from imap.sh.mvista.com (unknown [63.81.120.155]) by mail.tglx.de (Postfix) with ESMTP id BFD3A65C065 for ; Thu, 17 May 2007 15:18:39 +0200 (CEST) Received: from wasted.dev.rtsoft.ru (unknown [10.150.0.9]) by imap.sh.mvista.com (Postfix) with ESMTP id 8E3CB3EC9; Thu, 17 May 2007 06:18:35 -0700 (PDT) From: Sergei Shtylyov Organization: MontaVista Software Inc. To: mingo@elte.hu, tglx@linutronix.de Subject: [PATCH 2.6.21-rt2] PowerPC: revert fix for threaded fasteoi IRQ handlers Date: Thu, 17 May 2007 17:20:08 +0400 User-Agent: KMail/1.5 Cc: linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, dwalker@mvista.com References: <200611192243.34850.sshtylyov@ru.mvista.com> In-Reply-To: <200611192243.34850.sshtylyov@ru.mvista.com> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200705171719.34968.sshtylyov@ru.mvista.com> Content-Type: text/plain; charset="us-ascii" X-Evolution-Source: imap://tglx%40linutronix.de@localhost:8993/ Content-Transfer-Encoding: 8bit Revert the change to the "fasteoi" type chips as after handle_fasteoi_irq() had been fixed, they've become meaningless (and even dangerous -- as was the case with Celleb that has been fixed earlier)... Signed-off-by: Sergei Shtylyov --- The patch in question wasn't even initially accepted but then was erroneously restored along with the TOD patch. I've asked to revert it but to no avail, so here's the formal patch to revert it at last... arch/powerpc/platforms/iseries/irq.c | 1 - arch/powerpc/platforms/pseries/xics.c | 2 -- arch/powerpc/sysdev/mpic.c | 1 - 3 files changed, 4 deletions(-) Index: linux-2.6.26/arch/powerpc/platforms/iseries/irq.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/iseries/irq.c +++ linux-2.6.26/arch/powerpc/platforms/iseries/irq.c @@ -278,7 +278,6 @@ static struct irq_chip iseries_pic = { .shutdown = iseries_shutdown_IRQ, .unmask = iseries_enable_IRQ, .mask = iseries_disable_IRQ, - .ack = iseries_end_IRQ, .eoi = iseries_end_IRQ }; Index: linux-2.6.26/arch/powerpc/platforms/pseries/xics.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/pseries/xics.c +++ linux-2.6.26/arch/powerpc/platforms/pseries/xics.c @@ -501,7 +501,6 @@ static struct irq_chip xics_pic_direct = .startup = xics_startup, .mask = xics_mask_irq, .unmask = xics_unmask_irq, - .ack = xics_eoi_direct, .eoi = xics_eoi_direct, .set_affinity = xics_set_affinity }; @@ -512,7 +511,6 @@ static struct irq_chip xics_pic_lpar = { .startup = xics_startup, .mask = xics_mask_irq, .unmask = xics_unmask_irq, - .ack = xics_eoi_lpar, .eoi = xics_eoi_lpar, .set_affinity = xics_set_affinity }; Index: linux-2.6.26/arch/powerpc/sysdev/mpic.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/sysdev/mpic.c +++ linux-2.6.26/arch/powerpc/sysdev/mpic.c @@ -867,7 +867,6 @@ void mpic_set_vector(unsigned int virq, static struct irq_chip mpic_irq_chip = { .mask = mpic_mask_irq, .unmask = mpic_unmask_irq, - .ack = mpic_end_irq, .eoi = mpic_end_irq, .set_type = mpic_set_irq_type, }; patches/preempt-irqs-ppc-preempt-schedule-irq-entry-fix.patch0000664000076400007640000001065111043564043023451 0ustar tglxtglxFrom tsutomu.owa@toshiba.co.jp Tue May 22 13:47:39 2007 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.1.7-deb (2006-10-05) on debian X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=UNPARSEABLE_RELAY autolearn=unavailable version=3.1.7-deb Received: from inet-tsb5.toshiba.co.jp (inet-tsb5.toshiba.co.jp [202.33.96.24]) by mail.tglx.de (Postfix) with ESMTP id 57F7E65C065 for ; Tue, 22 May 2007 13:47:39 +0200 (CEST) Received: from tsb-wall.toshiba.co.jp ([133.199.160.134]) by inet-tsb5.toshiba.co.jp with ESMTP id l4MBlERT003242; Tue, 22 May 2007 20:47:14 +0900 (JST) Received: (from root@localhost) by tsb-wall.toshiba.co.jp id l4MBlEQK014361; Tue, 22 May 2007 20:47:14 +0900 (JST) Received: from ovp1.toshiba.co.jp [133.199.192.124] by tsb-wall.toshiba.co.jp with ESMTP id WAA14360; Tue, 22 May 2007 20:47:14 +0900 Received: from mx2.toshiba.co.jp (localhost [127.0.0.1]) by ovp1.toshiba.co.jp with ESMTP id l4MBlEDs007674; Tue, 22 May 2007 20:47:14 +0900 (JST) Received: from rdcgw.rdc.toshiba.co.jp by toshiba.co.jp id l4MBlDm9015993; Tue, 22 May 2007 20:47:13 +0900 (JST) Received: from island.swc.toshiba.co.jp by rdcgw.rdc.toshiba.co.jp (8.8.8p2+Sun/3.7W) with ESMTP id UAA17003; Tue, 22 May 2007 20:47:13 +0900 (JST) Received: from forest.toshiba.co.jp (forest [133.196.122.2]) by island.swc.toshiba.co.jp (Postfix) with ESMTP id 6A26B40002; Tue, 22 May 2007 20:47:13 +0900 (JST) Date: Tue, 22 May 2007 20:47:13 +0900 Message-ID: From: Tsutomu OWA To: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org Cc: mingo@elte.hu, tglx@linutronix.de Subject: [PATCH] powerpc 2.6.21-rt6: replace preempt_schedule w/ preempt_schedule_irq User-Agent: Wanderlust/2.8.1 (Something) Emacs/20.7 Mule/4.0 (HANANOEN) Organization: Software Engineering Center, TOSHIBA. MIME-Version: 1.0 (generated by SEMI 1.14.4 - "Hosorogi") Content-Type: text/plain; charset=US-ASCII X-Evolution-Source: imap://tglx%40linutronix.de@localhost:8993/ Content-Transfer-Encoding: 8bit Hi Ingo and Thomas, Please apply. Replace preempt_schedule() w/ preempt_schedule_irq() in irq return path, to avoid irq-entry recursion and stack overflow problems for powerpc64. It hits when doing netperf from another machine to the machine running rt kernel. This patch applies on top of linux-2.6.21 + patch-2.6.21-rt6. Compile, boot and netperf tested on celleb. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ~ $ uname -a Linux Linux 2.6.21-rt6 #1 SMP PREEMPT RT Tue May 22 19:18:00 JST 2007 ppc64 unkn own ~ $ Unable to handle kernel paging request for data at address 0xc0000180004cd9b 0 Faulting instruction address: 0xc00000000003da48 cpu 0x0: Vector: 300 (Data Access) at [c00000000fffba00] pc: c00000000003da48: .resched_task+0x34/0xc4 lr: c0000000000410b4: .try_to_wake_up+0x4cc/0x5a8 sp: c00000000fffbc80 msr: 9000000000001032 dar: c0000180004cd9b0 dsisr: 40000000 current = 0xc00000000244ed20 paca = 0xc0000000004cd980 pid = 425, comm = netserver enter ? for help [c00000000fffbd00] c0000000000410b4 .try_to_wake_up+0x4cc/0x5a8 [c00000000fffbde0] c0000000000880c8 .redirect_hardirq+0x68/0x88 [c00000000fffbe60] c00000000008aec8 .handle_level_irq+0x13c/0x220 [c00000000fffbf00] c000000000032538 .spider_irq_cascade+0x98/0xec [c00000000fffbf90] c000000000022280 .call_handle_irq+0x1c/0x2c [c0000000025abea0] c00000000000c33c .do_IRQ+0xc8/0x17c [c0000000025abf30] c00000000000444c hardware_interrupt_entry+0x18/0x4c --- arch/powerpc/kernel/entry_64.S | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) Index: linux-2.6.26/arch/powerpc/kernel/entry_64.S =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/entry_64.S +++ linux-2.6.26/arch/powerpc/kernel/entry_64.S @@ -623,8 +623,15 @@ do_work: user_work: #endif + andi. r0,r4,_TIF_NEED_RESCHED + beq 1f + + /* preempt_schedule_irq() expects interrupts disabled. */ + bl .preempt_schedule_irq + b .ret_from_except_lite + /* here we are preempting the current task */ - li r0,1 +1: li r0,1 stb r0,PACASOFTIRQEN(r13) stb r0,PACAHARDIRQEN(r13) @@ -632,12 +639,7 @@ user_work: ori r10,r10,MSR_EE mtmsrd r10,1 - andi. r0,r4,_TIF_NEED_RESCHED - beq 1f - bl .schedule - b .ret_from_except_lite - -1: bl .save_nvgprs + bl .save_nvgprs li r3,0 addi r4,r1,STACK_FRAME_OVERHEAD bl .do_signal patches/preempt-irqs-m68knommu-make-timer-interrupt-non-threaded.patch0000664000076400007640000000264211041657731025207 0ustar tglxtglxFrom 0b5363d39c40b92c1c6cc806ecef7086576e5162 Mon Sep 17 00:00:00 2001 From: Sebastian Siewior Date: Fri, 18 Apr 2008 17:02:23 +0200 Subject: [PATCH] m68knommu: make timer interrupt non threaded Signed-off-by: Sebastian Siewior --- arch/m68knommu/kernel/process.c | 6 ++++-- arch/m68knommu/platform/coldfire/pit.c | 2 +- 2 files changed, 5 insertions(+), 3 deletions(-) Index: linux-2.6.24.7/arch/m68knommu/kernel/process.c =================================================================== --- linux-2.6.24.7.orig/arch/m68knommu/kernel/process.c +++ linux-2.6.24.7/arch/m68knommu/kernel/process.c @@ -77,9 +77,11 @@ void cpu_idle(void) stop_critical_timings(); idle(); start_critical_timings(); - preempt_enable_no_resched(); - schedule(); + local_irq_disable(); + __preempt_enable_no_resched(); + __schedule(); preempt_disable(); + local_irq_enable(); } } Index: linux-2.6.24.7/arch/m68knommu/platform/coldfire/pit.c =================================================================== --- linux-2.6.24.7.orig/arch/m68knommu/platform/coldfire/pit.c +++ linux-2.6.24.7/arch/m68knommu/platform/coldfire/pit.c @@ -119,7 +119,7 @@ static irqreturn_t pit_tick(int irq, voi static struct irqaction pit_irq = { .name = "timer", - .flags = IRQF_DISABLED | IRQF_TIMER, + .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_NODELAY, .handler = pit_tick, }; patches/preempt-irqs-Kconfig.patch0000664000076400007640000000203211043564043016261 0ustar tglxtglx--- kernel/Kconfig.preempt | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) Index: linux-2.6.26/kernel/Kconfig.preempt =================================================================== --- linux-2.6.26.orig/kernel/Kconfig.preempt +++ linux-2.6.26/kernel/Kconfig.preempt @@ -108,3 +108,22 @@ config PREEMPT_SOFTIRQS Say N if you are unsure. +config PREEMPT_HARDIRQS + bool "Thread Hardirqs" + default n + depends on !GENERIC_HARDIRQS_NO__DO_IRQ + select PREEMPT_SOFTIRQS + help + This option reduces the latency of the kernel by 'threading' + hardirqs. This means that all (or selected) hardirqs will run + in their own kernel thread context. While this helps latency, + this feature can also reduce performance. + + The threading of hardirqs can also be controlled via the + /proc/sys/kernel/hardirq_preemption runtime flag and the + hardirq-preempt=0/1 boot-time option. Per-irq threading can + be enabled/disable via the /proc/irq///threaded + runtime flags. + + Say N if you are unsure. + patches/rt-apis.patch0000664000076400007640000000622611043564043013643 0ustar tglxtglx add new, -rt specific IRQ API variants. Maps to the same as before on non-PREEMPT_RT. include/linux/bottom_half.h | 8 ++++++++ include/linux/interrupt.h | 35 ++++++++++++++++++++++++++++++++++- 2 files changed, 42 insertions(+), 1 deletion(-) Index: linux-2.6.26/include/linux/bottom_half.h =================================================================== --- linux-2.6.26.orig/include/linux/bottom_half.h +++ linux-2.6.26/include/linux/bottom_half.h @@ -1,9 +1,17 @@ #ifndef _LINUX_BH_H #define _LINUX_BH_H +#ifdef CONFIG_PREEMPT_RT +# define local_bh_disable() do { } while (0) +# define __local_bh_disable(ip) do { } while (0) +# define _local_bh_enable() do { } while (0) +# define local_bh_enable() do { } while (0) +# define local_bh_enable_ip(ip) do { } while (0) +#else extern void local_bh_disable(void); extern void _local_bh_enable(void); extern void local_bh_enable(void); extern void local_bh_enable_ip(unsigned long ip); +#endif #endif /* _LINUX_BH_H */ Index: linux-2.6.26/include/linux/interrupt.h =================================================================== --- linux-2.6.26.orig/include/linux/interrupt.h +++ linux-2.6.26/include/linux/interrupt.h @@ -97,7 +97,7 @@ extern void devm_free_irq(struct device #ifdef CONFIG_LOCKDEP # define local_irq_enable_in_hardirq() do { } while (0) #else -# define local_irq_enable_in_hardirq() local_irq_enable() +# define local_irq_enable_in_hardirq() local_irq_enable_nort() #endif extern void disable_irq_nosync(unsigned int irq); @@ -485,4 +485,37 @@ static inline void init_irq_proc(void) int show_interrupts(struct seq_file *p, void *v); +#ifdef CONFIG_PREEMPT_RT +# define local_irq_disable_nort() do { } while (0) +# define local_irq_enable_nort() do { } while (0) +# define local_irq_enable_rt() local_irq_enable() +# define local_irq_save_nort(flags) do { local_save_flags(flags); } while (0) +# define local_irq_restore_nort(flags) do { (void)(flags); } while (0) +# define spin_lock_nort(lock) do { } while (0) +# define spin_unlock_nort(lock) do { } while (0) +# define spin_lock_bh_nort(lock) do { } while (0) +# define spin_unlock_bh_nort(lock) do { } while (0) +# define spin_lock_rt(lock) spin_lock(lock) +# define spin_unlock_rt(lock) spin_unlock(lock) +# define smp_processor_id_rt(cpu) (cpu) +# define in_atomic_rt() (!oops_in_progress && \ + (in_atomic() || irqs_disabled())) +# define read_trylock_rt(lock) ({read_lock(lock); 1; }) +#else +# define local_irq_disable_nort() local_irq_disable() +# define local_irq_enable_nort() local_irq_enable() +# define local_irq_enable_rt() do { } while (0) +# define local_irq_save_nort(flags) local_irq_save(flags) +# define local_irq_restore_nort(flags) local_irq_restore(flags) +# define spin_lock_rt(lock) do { } while (0) +# define spin_unlock_rt(lock) do { } while (0) +# define spin_lock_nort(lock) spin_lock(lock) +# define spin_unlock_nort(lock) spin_unlock(lock) +# define spin_lock_bh_nort(lock) spin_lock_bh(lock) +# define spin_unlock_bh_nort(lock) spin_unlock_bh(lock) +# define smp_processor_id_rt(cpu) smp_processor_id() +# define in_atomic_rt() 0 +# define read_trylock_rt(lock) read_trylock(lock) +#endif + #endif patches/rt-slab-new.patch0000664000076400007640000011510411043564043014413 0ustar tglxtglx new slab port. Signed-off-by: Ingo Molnar Folded in: From ak@suse.de Wed Sep 26 10:34:53 2007 Date: Mon, 17 Sep 2007 15:36:59 +0200 From: Andi Kleen To: mingo@elte.hu, Thomas Gleixner Cc: linux-rt-users@vger.kernel.org Subject: [PATCH] Fix alternate_node_alloc() on RT kernel __do_cache_allow/alternate_node_alloc() need to pass the this_cpu variable from the caller to cache_grow(); otherwise the slab lock for the wrong CPU can be released when a task switches CPUs inside cache_grow(). Signed-off-by: Andi Kleen --- mm/slab.c | 498 +++++++++++++++++++++++++++++++++++++++----------------------- 1 file changed, 319 insertions(+), 179 deletions(-) Index: linux-2.6.26/mm/slab.c =================================================================== --- linux-2.6.26.orig/mm/slab.c +++ linux-2.6.26/mm/slab.c @@ -117,6 +117,63 @@ #include /* + * On !PREEMPT_RT, raw irq flags are used as a per-CPU locking + * mechanism. + * + * On PREEMPT_RT, we use per-CPU locks for this. That's why the + * calling convention is changed slightly: a new 'flags' argument + * is passed to 'irq disable/enable' - the PREEMPT_RT code stores + * the CPU number of the lock there. + */ +#ifndef CONFIG_PREEMPT_RT +# define slab_irq_disable(cpu) \ + do { local_irq_disable(); (cpu) = smp_processor_id(); } while (0) +# define slab_irq_enable(cpu) local_irq_enable() +# define slab_irq_save(flags, cpu) \ + do { local_irq_save(flags); (cpu) = smp_processor_id(); } while (0) +# define slab_irq_restore(flags, cpu) local_irq_restore(flags) +/* + * In the __GFP_WAIT case we enable/disable interrupts on !PREEMPT_RT, + * which has no per-CPU locking effect since we are holding the cache + * lock in that case already. + * + * (On PREEMPT_RT, these are NOPs, but we have to drop/get the irq locks.) + */ +# define slab_irq_disable_nort() local_irq_disable() +# define slab_irq_enable_nort() local_irq_enable() +# define slab_irq_disable_rt(flags) do { (void)(flags); } while (0) +# define slab_irq_enable_rt(flags) do { (void)(flags); } while (0) +# define slab_spin_lock_irq(lock, cpu) \ + do { spin_lock_irq(lock); (cpu) = smp_processor_id(); } while (0) +# define slab_spin_unlock_irq(lock, cpu) \ + spin_unlock_irq(lock) +# define slab_spin_lock_irqsave(lock, flags, cpu) \ + do { spin_lock_irqsave(lock, flags); (cpu) = smp_processor_id(); } while (0) +# define slab_spin_unlock_irqrestore(lock, flags, cpu) \ + do { spin_unlock_irqrestore(lock, flags); } while (0) +#else +DEFINE_PER_CPU_LOCKED(int, slab_irq_locks) = { 0, }; +# define slab_irq_disable(cpu) (void)get_cpu_var_locked(slab_irq_locks, &(cpu)) +# define slab_irq_enable(cpu) put_cpu_var_locked(slab_irq_locks, cpu) +# define slab_irq_save(flags, cpu) \ + do { slab_irq_disable(cpu); (void) (flags); } while (0) +# define slab_irq_restore(flags, cpu) \ + do { slab_irq_enable(cpu); (void) (flags); } while (0) +# define slab_irq_disable_rt(cpu) slab_irq_disable(cpu) +# define slab_irq_enable_rt(cpu) slab_irq_enable(cpu) +# define slab_irq_disable_nort() do { } while (0) +# define slab_irq_enable_nort() do { } while (0) +# define slab_spin_lock_irq(lock, cpu) \ + do { slab_irq_disable(cpu); spin_lock(lock); } while (0) +# define slab_spin_unlock_irq(lock, cpu) \ + do { spin_unlock(lock); slab_irq_enable(cpu); } while (0) +# define slab_spin_lock_irqsave(lock, flags, cpu) \ + do { slab_irq_disable(cpu); spin_lock_irqsave(lock, flags); } while (0) +# define slab_spin_unlock_irqrestore(lock, flags, cpu) \ + do { spin_unlock_irqrestore(lock, flags); slab_irq_enable(cpu); } while (0) +#endif + +/* * DEBUG - 1 for kmem_cache_create() to honour; SLAB_RED_ZONE & SLAB_POISON. * 0 for faster, smaller code (especially in the critical paths). * @@ -312,7 +369,7 @@ struct kmem_list3 __initdata initkmem_li static int drain_freelist(struct kmem_cache *cache, struct kmem_list3 *l3, int tofree); static void free_block(struct kmem_cache *cachep, void **objpp, int len, - int node); + int node, int *this_cpu); static int enable_cpucache(struct kmem_cache *cachep); static void cache_reap(struct work_struct *unused); @@ -755,9 +812,10 @@ int slab_is_available(void) static DEFINE_PER_CPU(struct delayed_work, reap_work); -static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep) +static inline struct array_cache * +cpu_cache_get(struct kmem_cache *cachep, int this_cpu) { - return cachep->array[smp_processor_id()]; + return cachep->array[this_cpu]; } static inline struct kmem_cache *__find_general_cachep(size_t size, @@ -991,7 +1049,7 @@ static int transfer_objects(struct array #ifndef CONFIG_NUMA #define drain_alien_cache(cachep, alien) do { } while (0) -#define reap_alien(cachep, l3) do { } while (0) +#define reap_alien(cachep, l3, this_cpu) do { } while (0) static inline struct array_cache **alloc_alien_cache(int node, int limit) { @@ -1002,27 +1060,29 @@ static inline void free_alien_cache(stru { } -static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) +static inline int +cache_free_alien(struct kmem_cache *cachep, void *objp, int *this_cpu) { return 0; } static inline void *alternate_node_alloc(struct kmem_cache *cachep, - gfp_t flags) + gfp_t flags, int *this_cpu) { return NULL; } static inline void *____cache_alloc_node(struct kmem_cache *cachep, - gfp_t flags, int nodeid) + gfp_t flags, int nodeid, int *this_cpu) { return NULL; } #else /* CONFIG_NUMA */ -static void *____cache_alloc_node(struct kmem_cache *, gfp_t, int); -static void *alternate_node_alloc(struct kmem_cache *, gfp_t); +static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, + int nodeid, int *this_cpu); +static void *alternate_node_alloc(struct kmem_cache *, gfp_t, int *); static struct array_cache **alloc_alien_cache(int node, int limit) { @@ -1063,7 +1123,8 @@ static void free_alien_cache(struct arra } static void __drain_alien_cache(struct kmem_cache *cachep, - struct array_cache *ac, int node) + struct array_cache *ac, int node, + int *this_cpu) { struct kmem_list3 *rl3 = cachep->nodelists[node]; @@ -1077,7 +1138,7 @@ static void __drain_alien_cache(struct k if (rl3->shared) transfer_objects(rl3->shared, ac, ac->limit); - free_block(cachep, ac->entry, ac->avail, node); + free_block(cachep, ac->entry, ac->avail, node, this_cpu); ac->avail = 0; spin_unlock(&rl3->list_lock); } @@ -1086,15 +1147,16 @@ static void __drain_alien_cache(struct k /* * Called from cache_reap() to regularly drain alien caches round robin. */ -static void reap_alien(struct kmem_cache *cachep, struct kmem_list3 *l3) +static void +reap_alien(struct kmem_cache *cachep, struct kmem_list3 *l3, int *this_cpu) { - int node = __get_cpu_var(reap_node); + int node = per_cpu(reap_node, *this_cpu); if (l3->alien) { struct array_cache *ac = l3->alien[node]; if (ac && ac->avail && spin_trylock_irq(&ac->lock)) { - __drain_alien_cache(cachep, ac, node); + __drain_alien_cache(cachep, ac, node, this_cpu); spin_unlock_irq(&ac->lock); } } @@ -1103,21 +1165,22 @@ static void reap_alien(struct kmem_cache static void drain_alien_cache(struct kmem_cache *cachep, struct array_cache **alien) { - int i = 0; + int i = 0, this_cpu; struct array_cache *ac; unsigned long flags; for_each_online_node(i) { ac = alien[i]; if (ac) { - spin_lock_irqsave(&ac->lock, flags); - __drain_alien_cache(cachep, ac, i); - spin_unlock_irqrestore(&ac->lock, flags); + slab_spin_lock_irqsave(&ac->lock, flags, this_cpu); + __drain_alien_cache(cachep, ac, i, &this_cpu); + slab_spin_unlock_irqrestore(&ac->lock, flags, this_cpu); } } } -static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) +static inline int +cache_free_alien(struct kmem_cache *cachep, void *objp, int *this_cpu) { struct slab *slabp = virt_to_slab(objp); int nodeid = slabp->nodeid; @@ -1141,13 +1204,13 @@ static inline int cache_free_alien(struc spin_lock(&alien->lock); if (unlikely(alien->avail == alien->limit)) { STATS_INC_ACOVERFLOW(cachep); - __drain_alien_cache(cachep, alien, nodeid); + __drain_alien_cache(cachep, alien, nodeid, this_cpu); } alien->entry[alien->avail++] = objp; spin_unlock(&alien->lock); } else { spin_lock(&(cachep->nodelists[nodeid])->list_lock); - free_block(cachep, &objp, 1, nodeid); + free_block(cachep, &objp, 1, nodeid, this_cpu); spin_unlock(&(cachep->nodelists[nodeid])->list_lock); } return 1; @@ -1165,6 +1228,7 @@ static void __cpuinit cpuup_canceled(lon struct array_cache *nc; struct array_cache *shared; struct array_cache **alien; + int this_cpu; /* cpu is dead; no one can alloc from it. */ nc = cachep->array[cpu]; @@ -1174,29 +1238,31 @@ static void __cpuinit cpuup_canceled(lon if (!l3) goto free_array_cache; - spin_lock_irq(&l3->list_lock); + slab_spin_lock_irq(&l3->list_lock, this_cpu); /* Free limit for this kmem_list3 */ l3->free_limit -= cachep->batchcount; if (nc) - free_block(cachep, nc->entry, nc->avail, node); + free_block(cachep, nc->entry, nc->avail, node, + &this_cpu); if (!cpus_empty(*mask)) { - spin_unlock_irq(&l3->list_lock); + slab_spin_unlock_irq(&l3->list_lock, + this_cpu); goto free_array_cache; } shared = l3->shared; if (shared) { free_block(cachep, shared->entry, - shared->avail, node); + shared->avail, node, &this_cpu); l3->shared = NULL; } alien = l3->alien; l3->alien = NULL; - spin_unlock_irq(&l3->list_lock); + slab_spin_unlock_irq(&l3->list_lock, this_cpu); kfree(shared); if (alien) { @@ -1225,6 +1291,7 @@ static int __cpuinit cpuup_prepare(long struct kmem_list3 *l3 = NULL; int node = cpu_to_node(cpu); const int memsize = sizeof(struct kmem_list3); + int this_cpu; /* * We need to do this right in the beginning since @@ -1255,11 +1322,11 @@ static int __cpuinit cpuup_prepare(long cachep->nodelists[node] = l3; } - spin_lock_irq(&cachep->nodelists[node]->list_lock); + slab_spin_lock_irq(&cachep->nodelists[node]->list_lock, this_cpu); cachep->nodelists[node]->free_limit = (1 + nr_cpus_node(node)) * cachep->batchcount + cachep->num; - spin_unlock_irq(&cachep->nodelists[node]->list_lock); + slab_spin_unlock_irq(&cachep->nodelists[node]->list_lock, this_cpu); } /* @@ -1296,7 +1363,7 @@ static int __cpuinit cpuup_prepare(long l3 = cachep->nodelists[node]; BUG_ON(!l3); - spin_lock_irq(&l3->list_lock); + slab_spin_lock_irq(&l3->list_lock, this_cpu); if (!l3->shared) { /* * We are serialised from CPU_DEAD or @@ -1311,7 +1378,7 @@ static int __cpuinit cpuup_prepare(long alien = NULL; } #endif - spin_unlock_irq(&l3->list_lock); + slab_spin_unlock_irq(&l3->list_lock, this_cpu); kfree(shared); free_alien_cache(alien); } @@ -1388,11 +1455,13 @@ static void init_list(struct kmem_cache int nodeid) { struct kmem_list3 *ptr; + int this_cpu; ptr = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, nodeid); BUG_ON(!ptr); - local_irq_disable(); + WARN_ON(spin_is_locked(&list->list_lock)); + slab_irq_disable(this_cpu); memcpy(ptr, list, sizeof(struct kmem_list3)); /* * Do not assume that spinlocks can be initialized via memcpy: @@ -1401,7 +1470,7 @@ static void init_list(struct kmem_cache MAKE_ALL_LISTS(cachep, ptr, nodeid); cachep->nodelists[nodeid] = ptr; - local_irq_enable(); + slab_irq_enable(this_cpu); } /* @@ -1564,36 +1633,34 @@ void __init kmem_cache_init(void) /* 4) Replace the bootstrap head arrays */ { struct array_cache *ptr; + int this_cpu; ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); - local_irq_disable(); - BUG_ON(cpu_cache_get(&cache_cache) != &initarray_cache.cache); - memcpy(ptr, cpu_cache_get(&cache_cache), - sizeof(struct arraycache_init)); + slab_irq_disable(this_cpu); + BUG_ON(cpu_cache_get(&cache_cache, this_cpu) != &initarray_cache.cache); + memcpy(ptr, cpu_cache_get(&cache_cache, this_cpu), + sizeof(struct arraycache_init)); /* * Do not assume that spinlocks can be initialized via memcpy: */ spin_lock_init(&ptr->lock); - - cache_cache.array[smp_processor_id()] = ptr; - local_irq_enable(); + cache_cache.array[this_cpu] = ptr; + slab_irq_enable(this_cpu); ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); - local_irq_disable(); - BUG_ON(cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep) - != &initarray_generic.cache); - memcpy(ptr, cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep), - sizeof(struct arraycache_init)); + slab_irq_disable(this_cpu); + BUG_ON(cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep, this_cpu) + != &initarray_generic.cache); + memcpy(ptr, cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep, this_cpu), + sizeof(struct arraycache_init)); /* * Do not assume that spinlocks can be initialized via memcpy: */ spin_lock_init(&ptr->lock); - - malloc_sizes[INDEX_AC].cs_cachep->array[smp_processor_id()] = - ptr; - local_irq_enable(); + malloc_sizes[INDEX_AC].cs_cachep->array[this_cpu] = ptr; + slab_irq_enable(this_cpu); } /* 5) Replace the bootstrap kmem_list3's */ { @@ -1745,7 +1812,7 @@ static void store_stackinfo(struct kmem_ *addr++ = 0x12345678; *addr++ = caller; - *addr++ = smp_processor_id(); + *addr++ = raw_smp_processor_id(); size -= 3 * sizeof(unsigned long); { unsigned long *sptr = &caller; @@ -1900,7 +1967,11 @@ static void check_poison_obj(struct kmem } #endif +static void +__cache_free(struct kmem_cache *cachep, void *objp, int *this_cpu); + #if DEBUG + /** * slab_destroy_objs - destroy a slab and its objects * @cachep: cache pointer being destroyed @@ -1909,7 +1980,8 @@ static void check_poison_obj(struct kmem * Call the registered destructor for each object in a slab that is being * destroyed. */ -static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp) +static void +slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp) { int i; for (i = 0; i < cachep->num; i++) { @@ -1952,7 +2024,8 @@ static void slab_destroy_objs(struct kme * Before calling the slab must have been unlinked from the cache. The * cache-lock is not held/needed. */ -static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp) +static void +slab_destroy(struct kmem_cache *cachep, struct slab *slabp, int *this_cpu) { void *addr = slabp->s_mem - slabp->colouroff; @@ -1966,8 +2039,12 @@ static void slab_destroy(struct kmem_cac call_rcu(&slab_rcu->head, kmem_rcu_free); } else { kmem_freepages(cachep, addr); - if (OFF_SLAB(cachep)) - kmem_cache_free(cachep->slabp_cache, slabp); + if (OFF_SLAB(cachep)) { + if (this_cpu) + __cache_free(cachep->slabp_cache, slabp, this_cpu); + else + kmem_cache_free(cachep->slabp_cache, slabp); + } } } @@ -2064,6 +2141,8 @@ static size_t calculate_slab_order(struc static int __init_refok setup_cpu_cache(struct kmem_cache *cachep) { + int this_cpu; + if (g_cpucache_up == FULL) return enable_cpucache(cachep); @@ -2107,10 +2186,12 @@ static int __init_refok setup_cpu_cache( jiffies + REAPTIMEOUT_LIST3 + ((unsigned long)cachep) % REAPTIMEOUT_LIST3; - cpu_cache_get(cachep)->avail = 0; - cpu_cache_get(cachep)->limit = BOOT_CPUCACHE_ENTRIES; - cpu_cache_get(cachep)->batchcount = 1; - cpu_cache_get(cachep)->touched = 0; + this_cpu = raw_smp_processor_id(); + + cpu_cache_get(cachep, this_cpu)->avail = 0; + cpu_cache_get(cachep, this_cpu)->limit = BOOT_CPUCACHE_ENTRIES; + cpu_cache_get(cachep, this_cpu)->batchcount = 1; + cpu_cache_get(cachep, this_cpu)->touched = 0; cachep->batchcount = 1; cachep->limit = BOOT_CPUCACHE_ENTRIES; return 0; @@ -2400,19 +2481,19 @@ EXPORT_SYMBOL(kmem_cache_create); #if DEBUG static void check_irq_off(void) { +/* + * On PREEMPT_RT we use locks to protect the per-CPU lists, + * and keep interrupts enabled. + */ +#ifndef CONFIG_PREEMPT_RT BUG_ON(!irqs_disabled()); +#endif } static void check_irq_on(void) { +#ifndef CONFIG_PREEMPT_RT BUG_ON(irqs_disabled()); -} - -static void check_spinlock_acquired(struct kmem_cache *cachep) -{ -#ifdef CONFIG_SMP - check_irq_off(); - assert_spin_locked(&cachep->nodelists[numa_node_id()]->list_lock); #endif } @@ -2427,7 +2508,6 @@ static void check_spinlock_acquired_node #else #define check_irq_off() do { } while(0) #define check_irq_on() do { } while(0) -#define check_spinlock_acquired(x) do { } while(0) #define check_spinlock_acquired_node(x, y) do { } while(0) #endif @@ -2435,26 +2515,60 @@ static void drain_array(struct kmem_cach struct array_cache *ac, int force, int node); -static void do_drain(void *arg) +static void __do_drain(void *arg, int this_cpu) { struct kmem_cache *cachep = arg; + int node = cpu_to_node(this_cpu); struct array_cache *ac; - int node = numa_node_id(); check_irq_off(); - ac = cpu_cache_get(cachep); + ac = cpu_cache_get(cachep, this_cpu); spin_lock(&cachep->nodelists[node]->list_lock); - free_block(cachep, ac->entry, ac->avail, node); + free_block(cachep, ac->entry, ac->avail, node, &this_cpu); spin_unlock(&cachep->nodelists[node]->list_lock); ac->avail = 0; } +#ifdef CONFIG_PREEMPT_RT +static void do_drain(void *arg, int this_cpu) +{ + __do_drain(arg, this_cpu); +} +#else +static void do_drain(void *arg) +{ + __do_drain(arg, smp_processor_id()); +} +#endif + +#ifdef CONFIG_PREEMPT_RT +/* + * execute func() for all CPUs. On PREEMPT_RT we dont actually have + * to run on the remote CPUs - we only have to take their CPU-locks. + * (This is a rare operation, so cacheline bouncing is not an issue.) + */ +static void +slab_on_each_cpu(void (*func)(void *arg, int this_cpu), void *arg) +{ + unsigned int i; + + check_irq_on(); + for_each_online_cpu(i) { + spin_lock(&__get_cpu_lock(slab_irq_locks, i)); + func(arg, i); + spin_unlock(&__get_cpu_lock(slab_irq_locks, i)); + } +} +#else +# define slab_on_each_cpu(func, cachep) on_each_cpu(func, cachep, 1, 1) +#endif + static void drain_cpu_caches(struct kmem_cache *cachep) { struct kmem_list3 *l3; int node; - on_each_cpu(do_drain, cachep, 1, 1); + slab_on_each_cpu(do_drain, cachep); check_irq_on(); for_each_online_node(node) { l3 = cachep->nodelists[node]; @@ -2479,16 +2593,16 @@ static int drain_freelist(struct kmem_ca struct kmem_list3 *l3, int tofree) { struct list_head *p; - int nr_freed; + int nr_freed, this_cpu; struct slab *slabp; nr_freed = 0; while (nr_freed < tofree && !list_empty(&l3->slabs_free)) { - spin_lock_irq(&l3->list_lock); + slab_spin_lock_irq(&l3->list_lock, this_cpu); p = l3->slabs_free.prev; if (p == &l3->slabs_free) { - spin_unlock_irq(&l3->list_lock); + slab_spin_unlock_irq(&l3->list_lock, this_cpu); goto out; } @@ -2497,13 +2611,9 @@ static int drain_freelist(struct kmem_ca BUG_ON(slabp->inuse); #endif list_del(&slabp->list); - /* - * Safe to drop the lock. The slab is no longer linked - * to the cache. - */ l3->free_objects -= cache->num; - spin_unlock_irq(&l3->list_lock); - slab_destroy(cache, slabp); + slab_destroy(cache, slabp, &this_cpu); + slab_spin_unlock_irq(&l3->list_lock, this_cpu); nr_freed++; } out: @@ -2759,8 +2869,8 @@ static void slab_map_pages(struct kmem_c * Grow (by 1) the number of slabs within a cache. This is called by * kmem_cache_alloc() when there are no active objs left in a cache. */ -static int cache_grow(struct kmem_cache *cachep, - gfp_t flags, int nodeid, void *objp) +static int cache_grow(struct kmem_cache *cachep, gfp_t flags, int nodeid, + void *objp, int *this_cpu) { struct slab *slabp; size_t offset; @@ -2789,7 +2899,8 @@ static int cache_grow(struct kmem_cache offset *= cachep->colour_off; if (local_flags & __GFP_WAIT) - local_irq_enable(); + slab_irq_enable_nort(); + slab_irq_enable_rt(*this_cpu); /* * The test for missing atomic flag is performed here, rather than @@ -2818,8 +2929,10 @@ static int cache_grow(struct kmem_cache cache_init_objs(cachep, slabp); + slab_irq_disable_rt(*this_cpu); if (local_flags & __GFP_WAIT) - local_irq_disable(); + slab_irq_disable_nort(); + check_irq_off(); spin_lock(&l3->list_lock); @@ -2832,8 +2945,9 @@ static int cache_grow(struct kmem_cache opps1: kmem_freepages(cachep, objp); failed: + slab_irq_disable_rt(*this_cpu); if (local_flags & __GFP_WAIT) - local_irq_disable(); + slab_irq_disable_nort(); return 0; } @@ -2955,7 +3069,8 @@ bad: #define check_slabp(x,y) do { } while(0) #endif -static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags) +static void * +cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags, int *this_cpu) { int batchcount; struct kmem_list3 *l3; @@ -2965,7 +3080,7 @@ static void *cache_alloc_refill(struct k retry: check_irq_off(); node = numa_node_id(); - ac = cpu_cache_get(cachep); + ac = cpu_cache_get(cachep, *this_cpu); batchcount = ac->batchcount; if (!ac->touched && batchcount > BATCHREFILL_LIMIT) { /* @@ -2975,7 +3090,7 @@ retry: */ batchcount = BATCHREFILL_LIMIT; } - l3 = cachep->nodelists[node]; + l3 = cachep->nodelists[cpu_to_node(*this_cpu)]; BUG_ON(ac->avail > 0 || !l3); spin_lock(&l3->list_lock); @@ -2998,7 +3113,7 @@ retry: slabp = list_entry(entry, struct slab, list); check_slabp(cachep, slabp); - check_spinlock_acquired(cachep); + check_spinlock_acquired_node(cachep, cpu_to_node(*this_cpu)); /* * The slab was either on partial or free list so @@ -3012,8 +3127,9 @@ retry: STATS_INC_ACTIVE(cachep); STATS_SET_HIGH(cachep); - ac->entry[ac->avail++] = slab_get_obj(cachep, slabp, - node); + ac->entry[ac->avail++] = + slab_get_obj(cachep, slabp, + cpu_to_node(*this_cpu)); } check_slabp(cachep, slabp); @@ -3032,10 +3148,10 @@ alloc_done: if (unlikely(!ac->avail)) { int x; - x = cache_grow(cachep, flags | GFP_THISNODE, node, NULL); + x = cache_grow(cachep, flags | GFP_THISNODE, cpu_to_node(*this_cpu), NULL, this_cpu); /* cache_grow can reenable interrupts, then ac could change. */ - ac = cpu_cache_get(cachep); + ac = cpu_cache_get(cachep, *this_cpu); if (!x && ac->avail == 0) /* no objects in sight? abort */ return NULL; @@ -3187,21 +3303,22 @@ static inline int should_failslab(struct #endif /* CONFIG_FAILSLAB */ -static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags) +static inline void * +____cache_alloc(struct kmem_cache *cachep, gfp_t flags, int *this_cpu) { void *objp; struct array_cache *ac; check_irq_off(); - ac = cpu_cache_get(cachep); + ac = cpu_cache_get(cachep, *this_cpu); if (likely(ac->avail)) { STATS_INC_ALLOCHIT(cachep); ac->touched = 1; objp = ac->entry[--ac->avail]; } else { STATS_INC_ALLOCMISS(cachep); - objp = cache_alloc_refill(cachep, flags); + objp = cache_alloc_refill(cachep, flags, this_cpu); } return objp; } @@ -3213,7 +3330,8 @@ static inline void *____cache_alloc(stru * If we are in_interrupt, then process context, including cpusets and * mempolicy, may not apply and should not be used for allocation policy. */ -static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags) +static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags, + int *this_cpu) { int nid_alloc, nid_here; @@ -3225,7 +3343,7 @@ static void *alternate_node_alloc(struct else if (current->mempolicy) nid_alloc = slab_node(current->mempolicy); if (nid_alloc != nid_here) - return ____cache_alloc_node(cachep, flags, nid_alloc); + return ____cache_alloc_node(cachep, flags, nid_alloc, this_cpu); return NULL; } @@ -3237,7 +3355,7 @@ static void *alternate_node_alloc(struct * allocator to do its reclaim / fallback magic. We then insert the * slab into the proper nodelist and then allocate from it. */ -static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags) +static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags, int *this_cpu) { struct zonelist *zonelist; gfp_t local_flags; @@ -3265,7 +3383,8 @@ retry: cache->nodelists[nid] && cache->nodelists[nid]->free_objects) { obj = ____cache_alloc_node(cache, - flags | GFP_THISNODE, nid); + flags | GFP_THISNODE, nid, + this_cpu); if (obj) break; } @@ -3279,19 +3398,24 @@ retry: * set and go into memory reserves if necessary. */ if (local_flags & __GFP_WAIT) - local_irq_enable(); + slab_irq_enable_nort(); + slab_irq_enable_rt(*this_cpu); + kmem_flagcheck(cache, flags); obj = kmem_getpages(cache, local_flags, -1); + + slab_irq_disable_rt(*this_cpu); if (local_flags & __GFP_WAIT) - local_irq_disable(); + slab_irq_disable_nort(); + if (obj) { /* * Insert into the appropriate per node queues */ nid = page_to_nid(virt_to_page(obj)); - if (cache_grow(cache, flags, nid, obj)) { + if (cache_grow(cache, flags, nid, obj, this_cpu)) { obj = ____cache_alloc_node(cache, - flags | GFP_THISNODE, nid); + flags | GFP_THISNODE, nid, this_cpu); if (!obj) /* * Another processor may allocate the @@ -3312,7 +3436,7 @@ retry: * A interface to enable slab creation on nodeid */ static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, - int nodeid) + int nodeid, int *this_cpu) { struct list_head *entry; struct slab *slabp; @@ -3360,11 +3484,11 @@ retry: must_grow: spin_unlock(&l3->list_lock); - x = cache_grow(cachep, flags | GFP_THISNODE, nodeid, NULL); + x = cache_grow(cachep, flags | GFP_THISNODE, nodeid, NULL, this_cpu); if (x) goto retry; - return fallback_alloc(cachep, flags); + return fallback_alloc(cachep, flags, this_cpu); done: return obj; @@ -3386,39 +3510,41 @@ static __always_inline void * __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid, void *caller) { - unsigned long save_flags; + unsigned long irqflags; + int this_cpu; void *ptr; if (should_failslab(cachep, flags)) return NULL; cache_alloc_debugcheck_before(cachep, flags); - local_irq_save(save_flags); + + slab_irq_save(irqflags, this_cpu); if (unlikely(nodeid == -1)) - nodeid = numa_node_id(); + nodeid = cpu_to_node(this_cpu); if (unlikely(!cachep->nodelists[nodeid])) { /* Node not bootstrapped yet */ - ptr = fallback_alloc(cachep, flags); + ptr = fallback_alloc(cachep, flags, &this_cpu); goto out; } - if (nodeid == numa_node_id()) { + if (nodeid == cpu_to_node(this_cpu)) { /* * Use the locally cached objects if possible. * However ____cache_alloc does not allow fallback * to other nodes. It may fail while we still have * objects on other nodes available. */ - ptr = ____cache_alloc(cachep, flags); + ptr = ____cache_alloc(cachep, flags, &this_cpu); if (ptr) goto out; } /* ___cache_alloc_node can fall back to other nodes */ - ptr = ____cache_alloc_node(cachep, flags, nodeid); + ptr = ____cache_alloc_node(cachep, flags, nodeid, &this_cpu); out: - local_irq_restore(save_flags); + slab_irq_restore(irqflags, this_cpu); ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, caller); if (unlikely((flags & __GFP_ZERO) && ptr)) @@ -3428,33 +3554,33 @@ __cache_alloc_node(struct kmem_cache *ca } static __always_inline void * -__do_cache_alloc(struct kmem_cache *cache, gfp_t flags) +__do_cache_alloc(struct kmem_cache *cache, gfp_t flags, int *this_cpu) { void *objp; if (unlikely(current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) { - objp = alternate_node_alloc(cache, flags); + objp = alternate_node_alloc(cache, flags, this_cpu); if (objp) goto out; } - objp = ____cache_alloc(cache, flags); + objp = ____cache_alloc(cache, flags, this_cpu); /* * We may just have run out of memory on the local node. * ____cache_alloc_node() knows how to locate memory on other nodes */ - if (!objp) - objp = ____cache_alloc_node(cache, flags, numa_node_id()); - + if (!objp) + objp = ____cache_alloc_node(cache, flags, + cpu_to_node(*this_cpu), this_cpu); out: return objp; } #else static __always_inline void * -__do_cache_alloc(struct kmem_cache *cachep, gfp_t flags) +__do_cache_alloc(struct kmem_cache *cachep, gfp_t flags, int *this_cpu) { - return ____cache_alloc(cachep, flags); + return ____cache_alloc(cachep, flags, this_cpu); } #endif /* CONFIG_NUMA */ @@ -3463,15 +3589,16 @@ static __always_inline void * __cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller) { unsigned long save_flags; + int this_cpu; void *objp; if (should_failslab(cachep, flags)) return NULL; cache_alloc_debugcheck_before(cachep, flags); - local_irq_save(save_flags); - objp = __do_cache_alloc(cachep, flags); - local_irq_restore(save_flags); + slab_irq_save(save_flags, this_cpu); + objp = __do_cache_alloc(cachep, flags, &this_cpu); + slab_irq_restore(save_flags, this_cpu); objp = cache_alloc_debugcheck_after(cachep, flags, objp, caller); prefetchw(objp); @@ -3485,7 +3612,7 @@ __cache_alloc(struct kmem_cache *cachep, * Caller needs to acquire correct kmem_list's list_lock */ static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects, - int node) + int node, int *this_cpu) { int i; struct kmem_list3 *l3; @@ -3514,7 +3641,7 @@ static void free_block(struct kmem_cache * a different cache, refer to comments before * alloc_slabmgmt. */ - slab_destroy(cachep, slabp); + slab_destroy(cachep, slabp, this_cpu); } else { list_add(&slabp->list, &l3->slabs_free); } @@ -3528,11 +3655,12 @@ static void free_block(struct kmem_cache } } -static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac) +static void +cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac, int *this_cpu) { int batchcount; struct kmem_list3 *l3; - int node = numa_node_id(); + int node = cpu_to_node(*this_cpu); batchcount = ac->batchcount; #if DEBUG @@ -3554,7 +3682,7 @@ static void cache_flusharray(struct kmem } } - free_block(cachep, ac->entry, batchcount, node); + free_block(cachep, ac->entry, batchcount, node, this_cpu); free_done: #if STATS { @@ -3583,9 +3711,9 @@ free_done: * Release an obj back to its cache. If the obj has a constructed state, it must * be in this state _before_ it is released. Called with disabled ints. */ -static inline void __cache_free(struct kmem_cache *cachep, void *objp) +static void __cache_free(struct kmem_cache *cachep, void *objp, int *this_cpu) { - struct array_cache *ac = cpu_cache_get(cachep); + struct array_cache *ac = cpu_cache_get(cachep, *this_cpu); check_irq_off(); objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0)); @@ -3597,7 +3725,7 @@ static inline void __cache_free(struct k * variable to skip the call, which is mostly likely to be present in * the cache. */ - if (numa_platform && cache_free_alien(cachep, objp)) + if (numa_platform && cache_free_alien(cachep, objp, this_cpu)) return; if (likely(ac->avail < ac->limit)) { @@ -3606,7 +3734,7 @@ static inline void __cache_free(struct k return; } else { STATS_INC_FREEMISS(cachep); - cache_flusharray(cachep, ac); + cache_flusharray(cachep, ac, this_cpu); ac->entry[ac->avail++] = objp; } } @@ -3763,13 +3891,14 @@ EXPORT_SYMBOL(__kmalloc); void kmem_cache_free(struct kmem_cache *cachep, void *objp) { unsigned long flags; + int this_cpu; - local_irq_save(flags); + slab_irq_save(flags, this_cpu); debug_check_no_locks_freed(objp, obj_size(cachep)); if (!(cachep->flags & SLAB_DEBUG_OBJECTS)) debug_check_no_obj_freed(objp, obj_size(cachep)); - __cache_free(cachep, objp); - local_irq_restore(flags); + __cache_free(cachep, objp, &this_cpu); + slab_irq_restore(flags, this_cpu); } EXPORT_SYMBOL(kmem_cache_free); @@ -3786,16 +3915,17 @@ void kfree(const void *objp) { struct kmem_cache *c; unsigned long flags; + int this_cpu; if (unlikely(ZERO_OR_NULL_PTR(objp))) return; - local_irq_save(flags); + slab_irq_save(flags, this_cpu); kfree_debugcheck(objp); c = virt_to_cache(objp); debug_check_no_locks_freed(objp, obj_size(c)); debug_check_no_obj_freed(objp, obj_size(c)); - __cache_free(c, (void *)objp); - local_irq_restore(flags); + __cache_free(c, (void *)objp, &this_cpu); + slab_irq_restore(flags, this_cpu); } EXPORT_SYMBOL(kfree); @@ -3816,7 +3946,7 @@ EXPORT_SYMBOL_GPL(kmem_cache_name); */ static int alloc_kmemlist(struct kmem_cache *cachep) { - int node; + int node, this_cpu; struct kmem_list3 *l3; struct array_cache *new_shared; struct array_cache **new_alien = NULL; @@ -3844,11 +3974,11 @@ static int alloc_kmemlist(struct kmem_ca if (l3) { struct array_cache *shared = l3->shared; - spin_lock_irq(&l3->list_lock); + slab_spin_lock_irq(&l3->list_lock, this_cpu); if (shared) free_block(cachep, shared->entry, - shared->avail, node); + shared->avail, node, &this_cpu); l3->shared = new_shared; if (!l3->alien) { @@ -3857,7 +3987,7 @@ static int alloc_kmemlist(struct kmem_ca } l3->free_limit = (1 + nr_cpus_node(node)) * cachep->batchcount + cachep->num; - spin_unlock_irq(&l3->list_lock); + slab_spin_unlock_irq(&l3->list_lock, this_cpu); kfree(shared); free_alien_cache(new_alien); continue; @@ -3904,42 +4034,50 @@ struct ccupdate_struct { struct array_cache *new[NR_CPUS]; }; -static void do_ccupdate_local(void *info) +static void __do_ccupdate_local(void *info, int this_cpu) { struct ccupdate_struct *new = info; struct array_cache *old; check_irq_off(); - old = cpu_cache_get(new->cachep); + old = cpu_cache_get(new->cachep, this_cpu); - new->cachep->array[smp_processor_id()] = new->new[smp_processor_id()]; - new->new[smp_processor_id()] = old; + new->cachep->array[this_cpu] = new->new[this_cpu]; + new->new[this_cpu] = old; } +#ifdef CONFIG_PREEMPT_RT +static void do_ccupdate_local(void *arg, int this_cpu) +{ + __do_ccupdate_local(arg, this_cpu); +} +#else +static void do_ccupdate_local(void *arg) +{ + __do_ccupdate_local(arg, smp_processor_id()); +} +#endif + /* Always called with the cache_chain_mutex held */ static int do_tune_cpucache(struct kmem_cache *cachep, int limit, int batchcount, int shared) { - struct ccupdate_struct *new; - int i; - - new = kzalloc(sizeof(*new), GFP_KERNEL); - if (!new) - return -ENOMEM; + struct ccupdate_struct new; + int i, this_cpu; + memset(&new.new, 0, sizeof(new.new)); for_each_online_cpu(i) { - new->new[i] = alloc_arraycache(cpu_to_node(i), limit, + new.new[i] = alloc_arraycache(cpu_to_node(i), limit, batchcount); - if (!new->new[i]) { + if (!new.new[i]) { for (i--; i >= 0; i--) - kfree(new->new[i]); - kfree(new); + kfree(new.new[i]); return -ENOMEM; } } - new->cachep = cachep; + new.cachep = cachep; - on_each_cpu(do_ccupdate_local, (void *)new, 1, 1); + slab_on_each_cpu(do_ccupdate_local, (void *)&new); check_irq_on(); cachep->batchcount = batchcount; @@ -3947,15 +4085,15 @@ static int do_tune_cpucache(struct kmem_ cachep->shared = shared; for_each_online_cpu(i) { - struct array_cache *ccold = new->new[i]; + struct array_cache *ccold = new.new[i]; if (!ccold) continue; - spin_lock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock); - free_block(cachep, ccold->entry, ccold->avail, cpu_to_node(i)); - spin_unlock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock); + slab_spin_lock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock, this_cpu); + free_block(cachep, ccold->entry, ccold->avail, cpu_to_node(i), &this_cpu); + slab_spin_unlock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock, this_cpu); kfree(ccold); } - kfree(new); + return alloc_kmemlist(cachep); } @@ -4019,26 +4157,26 @@ static int enable_cpucache(struct kmem_c * if drain_array() is used on the shared array. */ void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, - struct array_cache *ac, int force, int node) + struct array_cache *ac, int force, int node) { - int tofree; + int tofree, this_cpu; if (!ac || !ac->avail) return; if (ac->touched && !force) { ac->touched = 0; } else { - spin_lock_irq(&l3->list_lock); + slab_spin_lock_irq(&l3->list_lock, this_cpu); if (ac->avail) { tofree = force ? ac->avail : (ac->limit + 4) / 5; if (tofree > ac->avail) tofree = (ac->avail + 1) / 2; - free_block(cachep, ac->entry, tofree, node); + free_block(cachep, ac->entry, tofree, node, &this_cpu); ac->avail -= tofree; memmove(ac->entry, &(ac->entry[tofree]), sizeof(void *) * ac->avail); } - spin_unlock_irq(&l3->list_lock); + slab_spin_unlock_irq(&l3->list_lock, this_cpu); } } @@ -4056,11 +4194,12 @@ void drain_array(struct kmem_cache *cach */ static void cache_reap(struct work_struct *w) { + int this_cpu = raw_smp_processor_id(), node = cpu_to_node(this_cpu); struct kmem_cache *searchp; struct kmem_list3 *l3; - int node = numa_node_id(); struct delayed_work *work = container_of(w, struct delayed_work, work); + int work_done = 0; if (!mutex_trylock(&cache_chain_mutex)) /* Give up. Setup the next iteration. */ @@ -4076,9 +4215,10 @@ static void cache_reap(struct work_struc */ l3 = searchp->nodelists[node]; - reap_alien(searchp, l3); + reap_alien(searchp, l3, &this_cpu); - drain_array(searchp, l3, cpu_cache_get(searchp), 0, node); + drain_array(searchp, l3, cpu_cache_get(searchp, this_cpu), + 0, node); /* * These are racy checks but it does not matter @@ -4167,7 +4307,7 @@ static int s_show(struct seq_file *m, vo unsigned long num_slabs, free_objects = 0, shared_avail = 0; const char *name; char *error = NULL; - int node; + int this_cpu, node; struct kmem_list3 *l3; active_objs = 0; @@ -4178,7 +4318,7 @@ static int s_show(struct seq_file *m, vo continue; check_irq_on(); - spin_lock_irq(&l3->list_lock); + slab_spin_lock_irq(&l3->list_lock, this_cpu); list_for_each_entry(slabp, &l3->slabs_full, list) { if (slabp->inuse != cachep->num && !error) @@ -4203,7 +4343,7 @@ static int s_show(struct seq_file *m, vo if (l3->shared) shared_avail += l3->shared->avail; - spin_unlock_irq(&l3->list_lock); + slab_spin_unlock_irq(&l3->list_lock, this_cpu); } num_slabs += active_slabs; num_objs = num_slabs * cachep->num; @@ -4399,7 +4539,7 @@ static int leaks_show(struct seq_file *m struct kmem_list3 *l3; const char *name; unsigned long *n = m->private; - int node; + int node, this_cpu; int i; if (!(cachep->flags & SLAB_STORE_USER)) @@ -4417,13 +4557,13 @@ static int leaks_show(struct seq_file *m continue; check_irq_on(); - spin_lock_irq(&l3->list_lock); + slab_spin_lock_irq(&l3->list_lock, this_cpu); list_for_each_entry(slabp, &l3->slabs_full, list) handle_slab(n, cachep, slabp); list_for_each_entry(slabp, &l3->slabs_partial, list) handle_slab(n, cachep, slabp); - spin_unlock_irq(&l3->list_lock); + slab_spin_unlock_irq(&l3->list_lock, this_cpu); } name = cachep->name; if (n[0] == n[1]) { patches/rt-page_alloc.patch0000664000076400007640000001267411043564042015000 0ustar tglxtglxSubject: rt-friendly per-cpu pages From: Ingo Molnar rt-friendly per-cpu pages: convert the irqs-off per-cpu locking method into a preemptible, explicit-per-cpu-locks method. Signed-off-by: Ingo Molnar --- mm/page_alloc.c | 100 ++++++++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 76 insertions(+), 24 deletions(-) Index: linux-2.6.26/mm/page_alloc.c =================================================================== --- linux-2.6.26.orig/mm/page_alloc.c +++ linux-2.6.26/mm/page_alloc.c @@ -162,6 +162,53 @@ static unsigned long __meminitdata dma_r EXPORT_SYMBOL(movable_zone); #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ +#ifdef CONFIG_PREEMPT_RT +static DEFINE_PER_CPU_LOCKED(int, pcp_locks); +#endif + +static inline void __lock_cpu_pcp(unsigned long *flags, int cpu) +{ +#ifdef CONFIG_PREEMPT_RT + spin_lock(&__get_cpu_lock(pcp_locks, cpu)); + flags = 0; +#else + local_irq_save(*flags); +#endif +} + +static inline void lock_cpu_pcp(unsigned long *flags, int *this_cpu) +{ +#ifdef CONFIG_PREEMPT_RT + (void)get_cpu_var_locked(pcp_locks, this_cpu); + flags = 0; +#else + local_irq_save(*flags); + *this_cpu = smp_processor_id(); +#endif +} + +static inline void unlock_cpu_pcp(unsigned long flags, int this_cpu) +{ +#ifdef CONFIG_PREEMPT_RT + put_cpu_var_locked(pcp_locks, this_cpu); +#else + local_irq_restore(flags); +#endif +} + +static struct per_cpu_pageset * +get_zone_pcp(struct zone *zone, unsigned long *flags, int *this_cpu) +{ + lock_cpu_pcp(flags, this_cpu); + return zone_pcp(zone, *this_cpu); +} + +static void +put_zone_pcp(struct zone *zone, unsigned long flags, int this_cpu) +{ + unlock_cpu_pcp(flags, this_cpu); +} + #if MAX_NUMNODES > 1 int nr_node_ids __read_mostly = MAX_NUMNODES; EXPORT_SYMBOL(nr_node_ids); @@ -507,8 +554,9 @@ static void free_one_page(struct zone *z static void __free_pages_ok(struct page *page, unsigned int order) { unsigned long flags; - int i; int reserved = 0; + int this_cpu; + int i; for (i = 0 ; i < (1 << order) ; ++i) reserved += free_pages_check(page + i); @@ -523,10 +571,10 @@ static void __free_pages_ok(struct page arch_free_page(page, order); kernel_map_pages(page, 1 << order, 0); - local_irq_save(flags); - __count_vm_events(PGFREE, 1 << order); + lock_cpu_pcp(&flags, &this_cpu); + count_vm_events(PGFREE, 1 << order); free_one_page(page_zone(page), page, order); - local_irq_restore(flags); + unlock_cpu_pcp(flags, this_cpu); } /* @@ -864,15 +912,16 @@ void drain_zone_pages(struct zone *zone, { unsigned long flags; int to_drain; + int this_cpu; - local_irq_save(flags); + lock_cpu_pcp(&flags, &this_cpu); if (pcp->count >= pcp->batch) to_drain = pcp->batch; else to_drain = pcp->count; free_pages_bulk(zone, to_drain, &pcp->list, 0); pcp->count -= to_drain; - local_irq_restore(flags); + unlock_cpu_pcp(flags, this_cpu); } #endif @@ -896,12 +945,15 @@ static void drain_pages(unsigned int cpu continue; pset = zone_pcp(zone, cpu); - + if (!pset) { + WARN_ON(1); + continue; + } pcp = &pset->pcp; - local_irq_save(flags); + lock_cpu_pcp(&flags, &cpu); free_pages_bulk(zone, pcp->count, &pcp->list, 0); pcp->count = 0; - local_irq_restore(flags); + unlock_cpu_pcp(flags, cpu); } } @@ -963,8 +1015,10 @@ void mark_free_pages(struct zone *zone) static void free_hot_cold_page(struct page *page, int cold) { struct zone *zone = page_zone(page); + struct per_cpu_pageset *pset; struct per_cpu_pages *pcp; unsigned long flags; + int this_cpu; if (PageAnon(page)) page->mapping = NULL; @@ -978,9 +1032,11 @@ static void free_hot_cold_page(struct pa arch_free_page(page, 0); kernel_map_pages(page, 1, 0); - pcp = &zone_pcp(zone, get_cpu())->pcp; - local_irq_save(flags); - __count_vm_event(PGFREE); + pset = get_zone_pcp(zone, &flags, &this_cpu); + pcp = &pset->pcp; + + count_vm_event(PGFREE); + if (cold) list_add_tail(&page->lru, &pcp->list); else @@ -991,8 +1047,7 @@ static void free_hot_cold_page(struct pa free_pages_bulk(zone, pcp->batch, &pcp->list, 0); pcp->count -= pcp->batch; } - local_irq_restore(flags); - put_cpu(); + put_zone_pcp(zone, flags, this_cpu); } void free_hot_page(struct page *page) @@ -1034,16 +1089,15 @@ static struct page *buffered_rmqueue(str unsigned long flags; struct page *page; int cold = !!(gfp_flags & __GFP_COLD); - int cpu; + struct per_cpu_pageset *pset; int migratetype = allocflags_to_migratetype(gfp_flags); + int this_cpu; again: - cpu = get_cpu(); + pset = get_zone_pcp(zone, &flags, &this_cpu); if (likely(order == 0)) { - struct per_cpu_pages *pcp; + struct per_cpu_pages *pcp = &pset->pcp; - pcp = &zone_pcp(zone, cpu)->pcp; - local_irq_save(flags); if (!pcp->count) { pcp->count = rmqueue_bulk(zone, 0, pcp->batch, &pcp->list, migratetype); @@ -1072,7 +1126,7 @@ again: list_del(&page->lru); pcp->count--; } else { - spin_lock_irqsave(&zone->lock, flags); + spin_lock(&zone->lock); page = __rmqueue(zone, order, migratetype); spin_unlock(&zone->lock); if (!page) @@ -1081,8 +1135,7 @@ again: __count_zone_vm_events(PGALLOC, zone, 1 << order); zone_statistics(preferred_zone, zone); - local_irq_restore(flags); - put_cpu(); + put_zone_pcp(zone, flags, this_cpu); VM_BUG_ON(bad_range(zone, page)); if (prep_new_page(page, order, gfp_flags)) @@ -1090,8 +1143,7 @@ again: return page; failed: - local_irq_restore(flags); - put_cpu(); + put_zone_pcp(zone, flags, this_cpu); return NULL; } patches/rt-mutex-preempt-debugging.patch0000664000076400007640000001326411043411775017457 0ustar tglxtglx--- include/linux/preempt.h | 18 +++++++++++++++--- include/linux/smp.h | 2 +- init/main.c | 2 +- kernel/sched.c | 24 ++++++++++++++++++++++-- kernel/softirq.c | 6 +++--- kernel/stop_machine.c | 2 +- 6 files changed, 43 insertions(+), 11 deletions(-) Index: linux-2.6.26/include/linux/preempt.h =================================================================== --- linux-2.6.26.orig/include/linux/preempt.h +++ linux-2.6.26/include/linux/preempt.h @@ -9,6 +9,7 @@ #include #include #include +#include #if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER) || \ defined(CONFIG_PREEMPT_TRACE) @@ -22,11 +23,12 @@ #define inc_preempt_count() add_preempt_count(1) #define dec_preempt_count() sub_preempt_count(1) -#define preempt_count() (current_thread_info()->preempt_count) +#define preempt_count() (current_thread_info()->preempt_count) #ifdef CONFIG_PREEMPT asmlinkage void preempt_schedule(void); +asmlinkage void preempt_schedule_irq(void); #define preempt_disable() \ do { \ @@ -34,12 +36,19 @@ do { \ barrier(); \ } while (0) -#define preempt_enable_no_resched() \ +#define __preempt_enable_no_resched() \ do { \ barrier(); \ dec_preempt_count(); \ } while (0) + +#ifdef CONFIG_DEBUG_PREEMPT +extern void notrace preempt_enable_no_resched(void); +#else +# define preempt_enable_no_resched() __preempt_enable_no_resched() +#endif + #define preempt_check_resched() \ do { \ if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \ @@ -48,7 +57,7 @@ do { \ #define preempt_enable() \ do { \ - preempt_enable_no_resched(); \ + __preempt_enable_no_resched(); \ barrier(); \ preempt_check_resched(); \ } while (0) @@ -85,6 +94,7 @@ do { \ #define preempt_disable() do { } while (0) #define preempt_enable_no_resched() do { } while (0) +#define __preempt_enable_no_resched() do { } while (0) #define preempt_enable() do { } while (0) #define preempt_check_resched() do { } while (0) @@ -92,6 +102,8 @@ do { \ #define preempt_enable_no_resched_notrace() do { } while (0) #define preempt_enable_notrace() do { } while (0) +#define preempt_schedule_irq() do { } while (0) + #endif #ifdef CONFIG_PREEMPT_NOTIFIERS Index: linux-2.6.26/include/linux/smp.h =================================================================== --- linux-2.6.26.orig/include/linux/smp.h +++ linux-2.6.26/include/linux/smp.h @@ -139,7 +139,7 @@ static inline void smp_send_reschedule(i #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) #define put_cpu() preempt_enable() -#define put_cpu_no_resched() preempt_enable_no_resched() +#define put_cpu_no_resched() __preempt_enable_no_resched() void smp_setup_processor_id(void); Index: linux-2.6.26/init/main.c =================================================================== --- linux-2.6.26.orig/init/main.c +++ linux-2.6.26/init/main.c @@ -469,7 +469,7 @@ static void noinline __init_refok rest_i * at least once to get things moving: */ init_idle_bootup_task(current); - preempt_enable_no_resched(); + __preempt_enable_no_resched(); schedule(); preempt_disable(); Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -2391,6 +2391,26 @@ fire_sched_out_preempt_notifiers(struct #endif +#ifdef CONFIG_DEBUG_PREEMPT +void notrace preempt_enable_no_resched(void) +{ + static int once = 1; + + barrier(); + dec_preempt_count(); + + if (once && !preempt_count()) { + once = 0; + printk(KERN_ERR "BUG: %s:%d task might have lost a preemption check!\n", + current->comm, current->pid); + dump_stack(); + } +} + +EXPORT_SYMBOL(preempt_enable_no_resched); +#endif + + /** * prepare_task_switch - prepare to switch tasks * @rq: the runqueue preparing to switch @@ -4296,7 +4316,7 @@ need_resched_nonpreemptible: if (unlikely(reacquire_kernel_lock(current) < 0)) goto need_resched_nonpreemptible; - preempt_enable_no_resched(); + __preempt_enable_no_resched(); if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) goto need_resched; } @@ -8010,7 +8030,7 @@ void __init sched_init(void) scheduler_running = 1; } -#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP +#if defined(CONFIG_DEBUG_SPINLOCK_SLEEP) || defined(CONFIG_DEBUG_PREEMPT) void __might_sleep(char *file, int line) { #ifdef in_atomic Index: linux-2.6.26/kernel/softirq.c =================================================================== --- linux-2.6.26.orig/kernel/softirq.c +++ linux-2.6.26/kernel/softirq.c @@ -385,7 +385,7 @@ void irq_exit(void) tick_nohz_stop_sched_tick(0); rcu_irq_exit(); #endif - preempt_enable_no_resched(); + __preempt_enable_no_resched(); } /* @@ -587,7 +587,7 @@ static int ksoftirqd(void * __data) while (!kthread_should_stop()) { preempt_disable(); if (!(local_softirq_pending() & mask)) { - preempt_enable_no_resched(); + __preempt_enable_no_resched(); schedule(); preempt_disable(); } @@ -606,7 +606,7 @@ static int ksoftirqd(void * __data) goto wait_to_die; local_irq_disable(); - preempt_enable_no_resched(); + __preempt_enable_no_resched(); set_softirq_pending(local_softirq_pending() & ~mask); local_bh_disable(); local_irq_enable(); Index: linux-2.6.26/kernel/stop_machine.c =================================================================== --- linux-2.6.26.orig/kernel/stop_machine.c +++ linux-2.6.26/kernel/stop_machine.c @@ -132,7 +132,7 @@ static void restart_machine(void) { stopmachine_set_state(STOPMACHINE_EXIT); local_irq_enable(); - preempt_enable_no_resched(); + __preempt_enable_no_resched(); } struct stop_machine_data { patches/rt-mutex-irq-flags-checking.patch0000664000076400007640000000464011043564042017502 0ustar tglxtglx--- include/linux/irqflags.h | 37 ++++++++++++++++++++++++++++++++----- 1 file changed, 32 insertions(+), 5 deletions(-) Index: linux-2.6.26/include/linux/irqflags.h =================================================================== --- linux-2.6.26.orig/include/linux/irqflags.h +++ linux-2.6.26/include/linux/irqflags.h @@ -11,6 +11,12 @@ #ifndef _LINUX_TRACE_IRQFLAGS_H #define _LINUX_TRACE_IRQFLAGS_H +#define BUILD_CHECK_IRQ_FLAGS(flags) \ + do { \ + BUILD_BUG_ON(sizeof(flags) != sizeof(unsigned long)); \ + typecheck(unsigned long, flags); \ + } while (0) + #ifdef CONFIG_TRACE_IRQFLAGS extern void trace_softirqs_on(unsigned long ip); extern void trace_softirqs_off(unsigned long ip); @@ -59,10 +65,15 @@ #define local_irq_disable() \ do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) #define local_irq_save(flags) \ - do { raw_local_irq_save(flags); trace_hardirqs_off(); } while (0) + do { \ + BUILD_CHECK_IRQ_FLAGS(flags); \ + raw_local_irq_save(flags); \ + trace_hardirqs_off(); \ + } while (0) #define local_irq_restore(flags) \ do { \ + BUILD_CHECK_IRQ_FLAGS(flags); \ if (raw_irqs_disabled_flags(flags)) { \ raw_local_irq_restore(flags); \ trace_hardirqs_off(); \ @@ -78,8 +89,16 @@ */ # define raw_local_irq_disable() local_irq_disable() # define raw_local_irq_enable() local_irq_enable() -# define raw_local_irq_save(flags) local_irq_save(flags) -# define raw_local_irq_restore(flags) local_irq_restore(flags) +# define raw_local_irq_save(flags) \ + do { \ + BUILD_CHECK_IRQ_FLAGS(flags); \ + local_irq_save(flags); \ + } while (0) +# define raw_local_irq_restore(flags) \ + do { \ + BUILD_CHECK_IRQ_FLAGS(flags); \ + local_irq_restore(flags); \ + } while (0) #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT @@ -89,7 +108,11 @@ raw_safe_halt(); \ } while (0) -#define local_save_flags(flags) raw_local_save_flags(flags) +#define local_save_flags(flags) \ + do { \ + BUILD_CHECK_IRQ_FLAGS(flags); \ + raw_local_save_flags(flags); \ + } while (0) #define irqs_disabled() \ ({ \ @@ -99,7 +122,11 @@ raw_irqs_disabled_flags(_flags); \ }) -#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) +#define irqs_disabled_flags(flags) \ +({ \ + BUILD_CHECK_IRQ_FLAGS(flags); \ + raw_irqs_disabled_flags(flags); \ +}) #endif /* CONFIG_X86 */ #endif patches/rt-mutex-trivial-tcp-preempt-fix.patch0000664000076400007640000000124611043564042020537 0ustar tglxtglx--- net/ipv4/tcp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6.26/net/ipv4/tcp.c =================================================================== --- linux-2.6.26.orig/net/ipv4/tcp.c +++ linux-2.6.26/net/ipv4/tcp.c @@ -1318,11 +1318,11 @@ int tcp_recvmsg(struct kiocb *iocb, stru (len > sysctl_tcp_dma_copybreak) && !(flags & MSG_PEEK) && !sysctl_tcp_low_latency && __get_cpu_var(softnet_data).net_dma) { - preempt_enable_no_resched(); + preempt_enable(); tp->ucopy.pinned_list = dma_pin_iovec_pages(msg->msg_iov, len); } else { - preempt_enable_no_resched(); + preempt_enable(); } } #endif patches/rt-mutex-trivial-route-cast-fix.patch0000664000076400007640000000077611043564042020374 0ustar tglxtglx--- net/ipv4/route.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/net/ipv4/route.c =================================================================== --- linux-2.6.26.orig/net/ipv4/route.c +++ linux-2.6.26/net/ipv4/route.c @@ -243,7 +243,7 @@ static __init void rt_hash_lock_init(voi spin_lock_init(&rt_hash_locks[i]); } #else -# define rt_hash_lock_addr(slot) NULL +# define rt_hash_lock_addr(slot) ((spinlock_t *)NULL) static inline void rt_hash_lock_init(void) { patches/rt-mutex-i386.patch0000664000076400007640000003173711043564041014543 0ustar tglxtglx--- arch/x86/Kconfig | 12 +++++++-- arch/x86/kernel/entry_32.S | 4 +-- arch/x86/kernel/process_32.c | 2 - include/asm-x86/rwsem.h | 51 +++++++++++++++++++-------------------- include/asm-x86/spinlock.h | 38 ++++++++++++++--------------- include/asm-x86/spinlock_types.h | 4 +-- 6 files changed, 60 insertions(+), 51 deletions(-) Index: linux-2.6.26/arch/x86/Kconfig =================================================================== --- linux-2.6.26.orig/arch/x86/Kconfig +++ linux-2.6.26/arch/x86/Kconfig @@ -95,10 +95,18 @@ config ARCH_MAY_HAVE_PC_FDC def_bool y config RWSEM_GENERIC_SPINLOCK - def_bool !X86_XADD + bool + depends on !X86_XADD || PREEMPT_RT + default y + +config ASM_SEMAPHORES + bool + default y config RWSEM_XCHGADD_ALGORITHM - def_bool X86_XADD + bool + depends on X86_XADD && !RWSEM_GENERIC_SPINLOCK + default y config ARCH_HAS_ILOG2_U32 def_bool n Index: linux-2.6.26/arch/x86/kernel/entry_32.S =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/entry_32.S +++ linux-2.6.26/arch/x86/kernel/entry_32.S @@ -481,7 +481,7 @@ ENDPROC(system_call) ALIGN RING0_PTREGS_FRAME # can't unwind into user space anyway work_pending: - testb $_TIF_NEED_RESCHED, %cl + testl $(_TIF_NEED_RESCHED), %ecx jz work_notifysig work_resched: call schedule @@ -494,7 +494,7 @@ work_resched: andl $_TIF_WORK_MASK, %ecx # is there any work to be done other # than syscall tracing? jz restore_all - testb $_TIF_NEED_RESCHED, %cl + testl $(_TIF_NEED_RESCHED), %ecx jnz work_resched work_notifysig: # deal with pending signals and Index: linux-2.6.26/arch/x86/kernel/process_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/process_32.c +++ linux-2.6.26/arch/x86/kernel/process_32.c @@ -191,7 +191,7 @@ void cpu_idle(void) start_critical_timings(); } tick_nohz_restart_sched_tick(); - preempt_enable_no_resched(); + __preempt_enable_no_resched(); schedule(); preempt_disable(); } Index: linux-2.6.26/include/asm-x86/rwsem.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/rwsem.h +++ linux-2.6.26/include/asm-x86/rwsem.h @@ -44,14 +44,14 @@ struct rwsem_waiter; -extern asmregparm struct rw_semaphore * - rwsem_down_read_failed(struct rw_semaphore *sem); -extern asmregparm struct rw_semaphore * - rwsem_down_write_failed(struct rw_semaphore *sem); -extern asmregparm struct rw_semaphore * - rwsem_wake(struct rw_semaphore *); -extern asmregparm struct rw_semaphore * - rwsem_downgrade_wake(struct rw_semaphore *sem); +extern asmregparm struct compat_rw_semaphore * + rwsem_down_read_failed(struct compat_rw_semaphore *sem); +extern asmregparm struct compat_rw_semaphore * + rwsem_down_write_failed(struct compat_rw_semaphore *sem); +extern asmregparm struct compat_rw_semaphore * + rwsem_wake(struct compat_rw_semaphore *); +extern asmregparm struct compat_rw_semaphore * + rwsem_downgrade_wake(struct compat_rw_semaphore *sem); /* * the semaphore definition @@ -64,7 +64,7 @@ extern asmregparm struct rw_semaphore * #define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS #define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS) -struct rw_semaphore { +struct compat_rw_semaphore { signed long count; spinlock_t wait_lock; struct list_head wait_list; @@ -86,23 +86,23 @@ struct rw_semaphore { LIST_HEAD_INIT((name).wait_list) __RWSEM_DEP_MAP_INIT(name) \ } -#define DECLARE_RWSEM(name) \ - struct rw_semaphore name = __RWSEM_INITIALIZER(name) +#define COMPAT_DECLARE_RWSEM(name) \ + struct compat_rw_semaphore name = __RWSEM_INITIALIZER(name) -extern void __init_rwsem(struct rw_semaphore *sem, const char *name, +extern void __compat_init_rwsem(struct compat_rw_semaphore *sem, const char *name, struct lock_class_key *key); -#define init_rwsem(sem) \ +#define compat_init_rwsem(sem) \ do { \ static struct lock_class_key __key; \ \ - __init_rwsem((sem), #sem, &__key); \ + __compat_init_rwsem((sem), #sem, &__key); \ } while (0) /* * lock for reading */ -static inline void __down_read(struct rw_semaphore *sem) +static inline void __down_read(struct compat_rw_semaphore *sem) { asm volatile("# beginning down_read\n\t" LOCK_PREFIX " incl (%%eax)\n\t" @@ -119,7 +119,7 @@ static inline void __down_read(struct rw /* * trylock for reading -- returns 1 if successful, 0 if contention */ -static inline int __down_read_trylock(struct rw_semaphore *sem) +static inline int __down_read_trylock(struct compat_rw_semaphore *sem) { __s32 result, tmp; asm volatile("# beginning __down_read_trylock\n\t" @@ -141,7 +141,8 @@ static inline int __down_read_trylock(st /* * lock for writing */ -static inline void __down_write_nested(struct rw_semaphore *sem, int subclass) +static inline void +__down_write_nested(struct compat_rw_semaphore *sem, int subclass) { int tmp; @@ -160,7 +161,7 @@ static inline void __down_write_nested(s : "memory", "cc"); } -static inline void __down_write(struct rw_semaphore *sem) +static inline void __down_write(struct compat_rw_semaphore *sem) { __down_write_nested(sem, 0); } @@ -168,7 +169,7 @@ static inline void __down_write(struct r /* * trylock for writing -- returns 1 if successful, 0 if contention */ -static inline int __down_write_trylock(struct rw_semaphore *sem) +static inline int __down_write_trylock(struct compat_rw_semaphore *sem) { signed long ret = cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE, @@ -181,7 +182,7 @@ static inline int __down_write_trylock(s /* * unlock after reading */ -static inline void __up_read(struct rw_semaphore *sem) +static inline void __up_read(struct compat_rw_semaphore *sem) { __s32 tmp = -RWSEM_ACTIVE_READ_BIAS; asm volatile("# beginning __up_read\n\t" @@ -199,7 +200,7 @@ static inline void __up_read(struct rw_s /* * unlock after writing */ -static inline void __up_write(struct rw_semaphore *sem) +static inline void __up_write(struct compat_rw_semaphore *sem) { asm volatile("# beginning __up_write\n\t" " movl %2,%%edx\n\t" @@ -218,7 +219,7 @@ static inline void __up_write(struct rw_ /* * downgrade write lock to read lock */ -static inline void __downgrade_write(struct rw_semaphore *sem) +static inline void __downgrade_write(struct compat_rw_semaphore *sem) { asm volatile("# beginning __downgrade_write\n\t" LOCK_PREFIX " addl %2,(%%eax)\n\t" @@ -235,7 +236,7 @@ static inline void __downgrade_write(str /* * implement atomic add functionality */ -static inline void rwsem_atomic_add(int delta, struct rw_semaphore *sem) +static inline void rwsem_atomic_add(int delta, struct compat_rw_semaphore *sem) { asm volatile(LOCK_PREFIX "addl %1,%0" : "+m" (sem->count) @@ -245,7 +246,7 @@ static inline void rwsem_atomic_add(int /* * implement exchange and add functionality */ -static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem) +static inline int rwsem_atomic_update(int delta, struct compat_rw_semaphore *sem) { int tmp = delta; @@ -256,7 +257,7 @@ static inline int rwsem_atomic_update(in return tmp + delta; } -static inline int rwsem_is_locked(struct rw_semaphore *sem) +static inline int rwsem_is_locked(struct compat_rw_semaphore *sem) { return (sem->count != 0); } Index: linux-2.6.26/include/asm-x86/spinlock.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/spinlock.h +++ linux-2.6.26/include/asm-x86/spinlock.h @@ -54,21 +54,21 @@ * much between them in performance though, especially as locks are out of line. */ #if (NR_CPUS < 256) -static inline int __raw_spin_is_locked(raw_spinlock_t *lock) +static inline int __raw_spin_is_locked(__raw_spinlock_t *lock) { int tmp = ACCESS_ONCE(lock->slock); return (((tmp >> 8) & 0xff) != (tmp & 0xff)); } -static inline int __raw_spin_is_contended(raw_spinlock_t *lock) +static inline int __raw_spin_is_contended(__raw_spinlock_t *lock) { int tmp = ACCESS_ONCE(lock->slock); return (((tmp >> 8) & 0xff) - (tmp & 0xff)) > 1; } -static __always_inline void __raw_spin_lock(raw_spinlock_t *lock) +static __always_inline void __raw_spin_lock(__raw_spinlock_t *lock) { short inc = 0x0100; @@ -89,7 +89,7 @@ static __always_inline void __raw_spin_l #define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock) -static __always_inline int __raw_spin_trylock(raw_spinlock_t *lock) +static __always_inline int __raw_spin_trylock(__raw_spinlock_t *lock) { int tmp; short new; @@ -110,7 +110,7 @@ static __always_inline int __raw_spin_tr return tmp; } -static __always_inline void __raw_spin_unlock(raw_spinlock_t *lock) +static __always_inline void __raw_spin_unlock(__raw_spinlock_t *lock) { asm volatile(UNLOCK_LOCK_PREFIX "incb %0" : "+m" (lock->slock) @@ -118,21 +118,21 @@ static __always_inline void __raw_spin_u : "memory", "cc"); } #else -static inline int __raw_spin_is_locked(raw_spinlock_t *lock) +static inline int __raw_spin_is_locked(__raw_spinlock_t *lock) { int tmp = ACCESS_ONCE(lock->slock); return (((tmp >> 16) & 0xffff) != (tmp & 0xffff)); } -static inline int __raw_spin_is_contended(raw_spinlock_t *lock) +static inline int __raw_spin_is_contended(__raw_spinlock_t *lock) { int tmp = ACCESS_ONCE(lock->slock); return (((tmp >> 16) & 0xffff) - (tmp & 0xffff)) > 1; } -static __always_inline void __raw_spin_lock(raw_spinlock_t *lock) +static __always_inline void __raw_spin_lock(__raw_spinlock_t *lock) { int inc = 0x00010000; int tmp; @@ -155,7 +155,7 @@ static __always_inline void __raw_spin_l #define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock) -static __always_inline int __raw_spin_trylock(raw_spinlock_t *lock) +static __always_inline int __raw_spin_trylock(__raw_spinlock_t *lock) { int tmp; int new; @@ -177,7 +177,7 @@ static __always_inline int __raw_spin_tr return tmp; } -static __always_inline void __raw_spin_unlock(raw_spinlock_t *lock) +static __always_inline void __raw_spin_unlock(__raw_spinlock_t *lock) { asm volatile(UNLOCK_LOCK_PREFIX "incw %0" : "+m" (lock->slock) @@ -186,7 +186,7 @@ static __always_inline void __raw_spin_u } #endif -static inline void __raw_spin_unlock_wait(raw_spinlock_t *lock) +static inline void __raw_spin_unlock_wait(__raw_spinlock_t *lock) { while (__raw_spin_is_locked(lock)) cpu_relax(); @@ -210,7 +210,7 @@ static inline void __raw_spin_unlock_wai * read_can_lock - would read_trylock() succeed? * @lock: the rwlock in question. */ -static inline int __raw_read_can_lock(raw_rwlock_t *lock) +static inline int __raw_read_can_lock(__raw_rwlock_t *lock) { return (int)(lock)->lock > 0; } @@ -219,12 +219,12 @@ static inline int __raw_read_can_lock(ra * write_can_lock - would write_trylock() succeed? * @lock: the rwlock in question. */ -static inline int __raw_write_can_lock(raw_rwlock_t *lock) +static inline int __raw_write_can_lock(__raw_rwlock_t *lock) { return (lock)->lock == RW_LOCK_BIAS; } -static inline void __raw_read_lock(raw_rwlock_t *rw) +static inline void __raw_read_lock(__raw_rwlock_t *rw) { asm volatile(LOCK_PREFIX " subl $1,(%0)\n\t" "jns 1f\n" @@ -233,7 +233,7 @@ static inline void __raw_read_lock(raw_r ::LOCK_PTR_REG (rw) : "memory"); } -static inline void __raw_write_lock(raw_rwlock_t *rw) +static inline void __raw_write_lock(__raw_rwlock_t *rw) { asm volatile(LOCK_PREFIX " subl %1,(%0)\n\t" "jz 1f\n" @@ -242,7 +242,7 @@ static inline void __raw_write_lock(raw_ ::LOCK_PTR_REG (rw), "i" (RW_LOCK_BIAS) : "memory"); } -static inline int __raw_read_trylock(raw_rwlock_t *lock) +static inline int __raw_read_trylock(__raw_rwlock_t *lock) { atomic_t *count = (atomic_t *)lock; @@ -253,7 +253,7 @@ static inline int __raw_read_trylock(raw return 0; } -static inline int __raw_write_trylock(raw_rwlock_t *lock) +static inline int __raw_write_trylock(__raw_rwlock_t *lock) { atomic_t *count = (atomic_t *)lock; @@ -263,12 +263,12 @@ static inline int __raw_write_trylock(ra return 0; } -static inline void __raw_read_unlock(raw_rwlock_t *rw) +static inline void __raw_read_unlock(__raw_rwlock_t *rw) { asm volatile(LOCK_PREFIX "incl %0" :"+m" (rw->lock) : : "memory"); } -static inline void __raw_write_unlock(raw_rwlock_t *rw) +static inline void __raw_write_unlock(__raw_rwlock_t *rw) { asm volatile(LOCK_PREFIX "addl %1, %0" : "+m" (rw->lock) : "i" (RW_LOCK_BIAS) : "memory"); Index: linux-2.6.26/include/asm-x86/spinlock_types.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/spinlock_types.h +++ linux-2.6.26/include/asm-x86/spinlock_types.h @@ -7,13 +7,13 @@ typedef struct { unsigned int slock; -} raw_spinlock_t; +} __raw_spinlock_t; #define __RAW_SPIN_LOCK_UNLOCKED { 0 } typedef struct { unsigned int lock; -} raw_rwlock_t; +} __raw_rwlock_t; #define __RAW_RW_LOCK_UNLOCKED { RW_LOCK_BIAS } patches/rt-mutex-x86-64.patch0000664000076400007640000001146411043564041014721 0ustar tglxtglx--- arch/x86/Kconfig | 2 +- arch/x86/kernel/entry_64.S | 18 +++++++++--------- arch/x86/kernel/traps_64.c | 8 ++++---- arch/x86/kernel/tsc_sync.c | 2 +- arch/x86/kernel/vsyscall_64.c | 2 +- 5 files changed, 16 insertions(+), 16 deletions(-) Index: linux-2.6.26/arch/x86/Kconfig =================================================================== --- linux-2.6.26.orig/arch/x86/Kconfig +++ linux-2.6.26/arch/x86/Kconfig @@ -105,7 +105,7 @@ config ASM_SEMAPHORES config RWSEM_XCHGADD_ALGORITHM bool - depends on X86_XADD && !RWSEM_GENERIC_SPINLOCK + depends on X86_XADD && !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT default y config ARCH_HAS_ILOG2_U32 Index: linux-2.6.26/arch/x86/kernel/entry_64.S =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/entry_64.S +++ linux-2.6.26/arch/x86/kernel/entry_64.S @@ -391,8 +391,8 @@ sysret_check: /* Handle reschedules */ /* edx: work, edi: workmask */ sysret_careful: - bt $TIF_NEED_RESCHED,%edx - jnc sysret_signal + testl $(_TIF_NEED_RESCHED),%edx + jz sysret_signal TRACE_IRQS_ON ENABLE_INTERRUPTS(CLBR_NONE) pushq %rdi @@ -415,7 +415,7 @@ sysret_signal: leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1 xorl %esi,%esi # oldset -> arg2 call ptregscall_common -1: movl $_TIF_NEED_RESCHED,%edi +1: movl $(_TIF_NEED_RESCHED),%edi /* Use IRET because user could have changed frame. This works because ptregscall_common has called FIXUP_TOP_OF_STACK. */ DISABLE_INTERRUPTS(CLBR_NONE) @@ -469,8 +469,8 @@ int_with_check: /* First do a reschedule test. */ /* edx: work, edi: workmask */ int_careful: - bt $TIF_NEED_RESCHED,%edx - jnc int_very_careful + testl $(_TIF_NEED_RESCHED),%edx + jz int_very_careful TRACE_IRQS_ON ENABLE_INTERRUPTS(CLBR_NONE) pushq %rdi @@ -505,7 +505,7 @@ int_signal: movq %rsp,%rdi # &ptregs -> arg1 xorl %esi,%esi # oldset -> arg2 call do_notify_resume -1: movl $_TIF_NEED_RESCHED,%edi +1: movl $(_TIF_NEED_RESCHED),%edi int_restore_rest: RESTORE_REST DISABLE_INTERRUPTS(CLBR_NONE) @@ -732,8 +732,8 @@ bad_iret: /* edi: workmask, edx: work */ retint_careful: CFI_RESTORE_STATE - bt $TIF_NEED_RESCHED,%edx - jnc retint_signal + testl $(_TIF_NEED_RESCHED),%edx + jz retint_signal TRACE_IRQS_ON ENABLE_INTERRUPTS(CLBR_NONE) pushq %rdi @@ -759,7 +759,7 @@ retint_signal: RESTORE_REST DISABLE_INTERRUPTS(CLBR_NONE) TRACE_IRQS_OFF - movl $_TIF_NEED_RESCHED,%edi + movl $(_TIF_NEED_RESCHED),%edi GET_THREAD_INFO(%rcx) jmp retint_check Index: linux-2.6.26/arch/x86/kernel/traps_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/traps_64.c +++ linux-2.6.26/arch/x86/kernel/traps_64.c @@ -518,7 +518,7 @@ int is_valid_bugaddr(unsigned long ip) return ud2 == 0x0b0f; } -static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED; +static raw_spinlock_t die_lock = RAW_SPIN_LOCK_UNLOCKED(die_lock); static int die_owner = -1; static unsigned int die_nest_count; @@ -532,11 +532,11 @@ unsigned __kprobes long oops_begin(void) /* racy, but better than risking deadlock. */ raw_local_irq_save(flags); cpu = smp_processor_id(); - if (!__raw_spin_trylock(&die_lock)) { + if (!spin_trylock(&die_lock)) { if (cpu == die_owner) /* nested oops. should stop eventually */; else - __raw_spin_lock(&die_lock); + spin_lock(&die_lock); } die_nest_count++; die_owner = cpu; @@ -552,7 +552,7 @@ void __kprobes oops_end(unsigned long fl die_nest_count--; if (!die_nest_count) /* Nest count reaches zero, release the lock. */ - __raw_spin_unlock(&die_lock); + spin_unlock(&die_lock); raw_local_irq_restore(flags); if (!regs) { oops_exit(); Index: linux-2.6.26/arch/x86/kernel/tsc_sync.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/tsc_sync.c +++ linux-2.6.26/arch/x86/kernel/tsc_sync.c @@ -33,7 +33,7 @@ static __cpuinitdata atomic_t stop_count * we want to have the fastest, inlined, non-debug version * of a critical section, to be able to prove TSC time-warps: */ -static __cpuinitdata raw_spinlock_t sync_lock = __RAW_SPIN_LOCK_UNLOCKED; +static __cpuinitdata __raw_spinlock_t sync_lock = __RAW_SPIN_LOCK_UNLOCKED; static __cpuinitdata cycles_t last_tsc; static __cpuinitdata cycles_t max_warp; static __cpuinitdata int nr_warps; Index: linux-2.6.26/arch/x86/kernel/vsyscall_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/vsyscall_64.c +++ linux-2.6.26/arch/x86/kernel/vsyscall_64.c @@ -56,7 +56,7 @@ int __vgetcpu_mode __section_vgetcpu_mod struct vsyscall_gtod_data __vsyscall_gtod_data __section_vsyscall_gtod_data = { - .lock = SEQLOCK_UNLOCKED, + .lock = __RAW_SEQLOCK_UNLOCKED(__vsyscall_gtod_data.lock), .sysctl_enabled = 1, }; patches/rt-mutex-core.patch0000664000076400007640000053421211043564041014776 0ustar tglxtglx--- drivers/input/ff-memless.c | 1 fs/proc/array.c | 27 + include/linux/bit_spinlock.h | 4 include/linux/init_task.h | 3 include/linux/mutex.h | 63 +++ include/linux/pickop.h | 32 + include/linux/plist.h | 4 include/linux/rt_lock.h | 286 +++++++++++++++++ include/linux/rtmutex.h | 6 include/linux/rwsem-spinlock.h | 35 +- include/linux/rwsem.h | 108 +++++- include/linux/sched.h | 80 +++- include/linux/semaphore.h | 78 +++- include/linux/seqlock.h | 270 +++++++++++++--- include/linux/spinlock.h | 609 ++++++++++++++++++++++++++---------- include/linux/spinlock_api_smp.h | 91 +++-- include/linux/spinlock_api_up.h | 74 ++-- include/linux/spinlock_types.h | 61 ++- include/linux/spinlock_types_up.h | 6 include/linux/spinlock_up.h | 8 kernel/Makefile | 6 kernel/fork.c | 6 kernel/futex.c | 4 kernel/lockdep.c | 2 kernel/rt.c | 634 ++++++++++++++++++++++++++++++++++++++ kernel/rtmutex-debug.c | 108 ++---- kernel/rtmutex.c | 450 +++++++++++++++++++++++--- kernel/rwsem.c | 44 +- kernel/sched.c | 66 ++- kernel/sched_clock.c | 4 kernel/semaphore.c | 46 +- kernel/spinlock.c | 264 ++++++++++----- kernel/trace/trace.c | 8 kernel/trace/trace.h | 2 lib/dec_and_lock.c | 4 lib/kernel_lock.c | 4 lib/locking-selftest.c | 6 lib/plist.c | 2 lib/rwsem-spinlock.c | 29 - lib/rwsem.c | 6 lib/spinlock_debug.c | 64 +-- 41 files changed, 2898 insertions(+), 707 deletions(-) Index: linux-2.6.26/drivers/input/ff-memless.c =================================================================== --- linux-2.6.26.orig/drivers/input/ff-memless.c +++ linux-2.6.26/drivers/input/ff-memless.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include Index: linux-2.6.26/fs/proc/array.c =================================================================== --- linux-2.6.26.orig/fs/proc/array.c +++ linux-2.6.26/fs/proc/array.c @@ -137,12 +137,13 @@ static inline void task_name(struct seq_ */ static const char *task_state_array[] = { "R (running)", /* 0 */ - "S (sleeping)", /* 1 */ - "D (disk sleep)", /* 2 */ - "T (stopped)", /* 4 */ - "T (tracing stop)", /* 8 */ - "Z (zombie)", /* 16 */ - "X (dead)" /* 32 */ + "M (running-mutex)", /* 1 */ + "S (sleeping)", /* 2 */ + "D (disk sleep)", /* 4 */ + "T (stopped)", /* 8 */ + "T (tracing stop)", /* 16 */ + "Z (zombie)", /* 32 */ + "X (dead)" /* 64 */ }; static inline const char *get_task_state(struct task_struct *tsk) @@ -310,6 +311,19 @@ static inline void task_context_switch_c p->nivcsw); } +#define get_blocked_on(t) (-1) + +static inline void show_blocked_on(struct seq_file *m, struct task_struct *p) +{ + pid_t pid = get_blocked_on(p); + + if (pid < 0) + return; + + seq_printf(m, "BlckOn: %d\n", pid); +} + + int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { @@ -329,6 +343,7 @@ int proc_pid_status(struct seq_file *m, task_show_regs(m, task); #endif task_context_switch_counts(m, task); + show_blocked_on(m, task); return 0; } Index: linux-2.6.26/include/linux/bit_spinlock.h =================================================================== --- linux-2.6.26.orig/include/linux/bit_spinlock.h +++ linux-2.6.26/include/linux/bit_spinlock.h @@ -1,6 +1,8 @@ #ifndef __LINUX_BIT_SPINLOCK_H #define __LINUX_BIT_SPINLOCK_H +#if 0 + /* * bit-based spin_lock() * @@ -91,5 +93,7 @@ static inline int bit_spin_is_locked(int #endif } +#endif + #endif /* __LINUX_BIT_SPINLOCK_H */ Index: linux-2.6.26/include/linux/init_task.h =================================================================== --- linux-2.6.26.orig/include/linux/init_task.h +++ linux-2.6.26/include/linux/init_task.h @@ -10,6 +10,7 @@ #include #include #include +#include extern struct files_struct init_files; @@ -181,7 +182,7 @@ extern struct group_info init_groups; .journal_info = NULL, \ .cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \ .fs_excl = ATOMIC_INIT(0), \ - .pi_lock = __SPIN_LOCK_UNLOCKED(tsk.pi_lock), \ + .pi_lock = RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock), \ .pids = { \ [PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \ [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID), \ Index: linux-2.6.26/include/linux/mutex.h =================================================================== --- linux-2.6.26.orig/include/linux/mutex.h +++ linux-2.6.26/include/linux/mutex.h @@ -12,11 +12,73 @@ #include #include +#include #include #include #include +#ifdef CONFIG_PREEMPT_RT + +#include + +struct mutex { + struct rt_mutex lock; +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +}; + +#define __MUTEX_INITIALIZER(mutexname) \ + { \ + .lock = __RT_MUTEX_INITIALIZER(mutexname.lock) \ + } + +#define DEFINE_MUTEX(mutexname) \ + struct mutex mutexname = __MUTEX_INITIALIZER(mutexname) + +extern void +_mutex_init(struct mutex *lock, char *name, struct lock_class_key *key); + +extern void __lockfunc _mutex_lock(struct mutex *lock); +extern int __lockfunc _mutex_lock_interruptible(struct mutex *lock); +extern int __lockfunc _mutex_lock_killable(struct mutex *lock); +extern void __lockfunc _mutex_lock_nested(struct mutex *lock, int subclass); +extern int __lockfunc _mutex_lock_interruptible_nested(struct mutex *lock, int subclass); +extern int __lockfunc _mutex_lock_killable_nested(struct mutex *lock, int subclass); +extern int __lockfunc _mutex_trylock(struct mutex *lock); +extern void __lockfunc _mutex_unlock(struct mutex *lock); + +#define mutex_is_locked(l) rt_mutex_is_locked(&(l)->lock) +#define mutex_lock(l) _mutex_lock(l) +#define mutex_lock_interruptible(l) _mutex_lock_interruptible(l) +#define mutex_lock_killable(l) _mutex_lock_killable(l) +#define mutex_trylock(l) _mutex_trylock(l) +#define mutex_unlock(l) _mutex_unlock(l) +#define mutex_destroy(l) rt_mutex_destroy(&(l)->lock) + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define mutex_lock_nested(l, s) _mutex_lock_nested(l, s) +# define mutex_lock_interruptible_nested(l, s) \ + _mutex_lock_interruptible_nested(l, s) +# define mutex_lock_killable_nested(l, s) \ + _mutex_lock_killable_nested(l, s) +#else +# define mutex_lock_nested(l, s) _mutex_lock(l) +# define mutex_lock_interruptible_nested(l, s) \ + _mutex_lock_interruptible(l) +# define mutex_lock_killable_nested(l, s) \ + _mutex_lock_killable(l) +#endif + +# define mutex_init(mutex) \ +do { \ + static struct lock_class_key __key; \ + \ + _mutex_init((mutex), #mutex, &__key); \ +} while (0) + +#else /* * Simple, straightforward mutexes with strict semantics: * @@ -149,3 +211,4 @@ extern int mutex_trylock(struct mutex *l extern void mutex_unlock(struct mutex *lock); #endif +#endif Index: linux-2.6.26/include/linux/pickop.h =================================================================== --- /dev/null +++ linux-2.6.26/include/linux/pickop.h @@ -0,0 +1,32 @@ +#ifndef _LINUX_PICKOP_H +#define _LINUX_PICKOP_H + +#undef PICK_TYPE_EQUAL +#define PICK_TYPE_EQUAL(var, type) \ + __builtin_types_compatible_p(typeof(var), type) + +extern int __bad_func_type(void); + +#define PICK_FUNCTION(type1, type2, func1, func2, arg0, ...) \ +do { \ + if (PICK_TYPE_EQUAL((arg0), type1)) \ + func1((type1)(arg0), ##__VA_ARGS__); \ + else if (PICK_TYPE_EQUAL((arg0), type2)) \ + func2((type2)(arg0), ##__VA_ARGS__); \ + else __bad_func_type(); \ +} while (0) + +#define PICK_FUNCTION_RET(type1, type2, func1, func2, arg0, ...) \ +({ \ + unsigned long __ret; \ + \ + if (PICK_TYPE_EQUAL((arg0), type1)) \ + __ret = func1((type1)(arg0), ##__VA_ARGS__); \ + else if (PICK_TYPE_EQUAL((arg0), type2)) \ + __ret = func2((type2)(arg0), ##__VA_ARGS__); \ + else __ret = __bad_func_type(); \ + \ + __ret; \ +}) + +#endif /* _LINUX_PICKOP_H */ Index: linux-2.6.26/include/linux/plist.h =================================================================== --- linux-2.6.26.orig/include/linux/plist.h +++ linux-2.6.26/include/linux/plist.h @@ -81,7 +81,7 @@ struct plist_head { struct list_head prio_list; struct list_head node_list; #ifdef CONFIG_DEBUG_PI_LIST - spinlock_t *lock; + raw_spinlock_t *lock; #endif }; @@ -125,7 +125,7 @@ struct plist_node { * @lock: list spinlock, remembered for debugging */ static inline void -plist_head_init(struct plist_head *head, spinlock_t *lock) +plist_head_init(struct plist_head *head, raw_spinlock_t *lock) { INIT_LIST_HEAD(&head->prio_list); INIT_LIST_HEAD(&head->node_list); Index: linux-2.6.26/include/linux/rt_lock.h =================================================================== --- /dev/null +++ linux-2.6.26/include/linux/rt_lock.h @@ -0,0 +1,286 @@ +#ifndef __LINUX_RT_LOCK_H +#define __LINUX_RT_LOCK_H + +/* + * Real-Time Preemption Support + * + * started by Ingo Molnar: + * + * Copyright (C) 2004, 2005 Red Hat, Inc., Ingo Molnar + * + * This file contains the main data structure definitions. + */ +#include +#include +#include + +#ifdef CONFIG_PREEMPT_RT +/* + * spinlocks - an RT mutex plus lock-break field: + */ +typedef struct { + struct rt_mutex lock; + unsigned int break_lock; +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +} spinlock_t; + +#ifdef CONFIG_DEBUG_RT_MUTEXES +# define __SPIN_LOCK_UNLOCKED(name) \ + (spinlock_t) { { .wait_lock = _RAW_SPIN_LOCK_UNLOCKED(name) \ + , .save_state = 1, .file = __FILE__, .line = __LINE__ }, SPIN_DEP_MAP_INIT(name) } +#else +# define __SPIN_LOCK_UNLOCKED(name) \ + (spinlock_t) { { .wait_lock = _RAW_SPIN_LOCK_UNLOCKED(name) }, SPIN_DEP_MAP_INIT(name) } +#endif +# define SPIN_LOCK_UNLOCKED __SPIN_LOCK_UNLOCKED(spin_old_style) +#else /* !PREEMPT_RT */ + typedef raw_spinlock_t spinlock_t; +# ifdef CONFIG_DEBUG_SPINLOCK +# define _SPIN_LOCK_UNLOCKED \ + { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \ + .magic = SPINLOCK_MAGIC, \ + .owner = SPINLOCK_OWNER_INIT, \ + .owner_cpu = -1 } +# else +# define _SPIN_LOCK_UNLOCKED \ + { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED } +# endif +# define SPIN_LOCK_UNLOCKED _SPIN_LOCK_UNLOCKED +# define __SPIN_LOCK_UNLOCKED(name) _SPIN_LOCK_UNLOCKED +#endif + +#define __DEFINE_SPINLOCK(name) \ + spinlock_t name = __SPIN_LOCK_UNLOCKED(name) + +#define DEFINE_SPINLOCK(name) \ + spinlock_t name __cacheline_aligned_in_smp = __SPIN_LOCK_UNLOCKED(name) + +#ifdef CONFIG_PREEMPT_RT + +/* + * RW-semaphores are a spinlock plus a reader-depth count. + * + * Note that the semantics are different from the usual + * Linux rw-sems, in PREEMPT_RT mode we do not allow + * multiple readers to hold the lock at once, we only allow + * a read-lock owner to read-lock recursively. This is + * better for latency, makes the implementation inherently + * fair and makes it simpler as well: + */ +struct rw_semaphore { + struct rt_mutex lock; + int read_depth; +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +}; + +/* + * rwlocks - an RW semaphore plus lock-break field: + */ +typedef struct { + struct rt_mutex lock; + int read_depth; + unsigned int break_lock; +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +} rwlock_t; + +# ifdef CONFIG_DEBUG_RT_MUTEXES +# define __RW_LOCK_UNLOCKED(name) (rwlock_t) \ + { .lock = { .wait_lock = _RAW_SPIN_LOCK_UNLOCKED(name), \ + .save_state = 1, .file = __FILE__, .line = __LINE__ } } +# else +# define __RW_LOCK_UNLOCKED(name) (rwlock_t) \ + { .lock = { .wait_lock = _RAW_SPIN_LOCK_UNLOCKED(name) } } +# endif +#else /* !PREEMPT_RT */ + + typedef raw_rwlock_t rwlock_t; +# ifdef CONFIG_DEBUG_SPINLOCK +# define _RW_LOCK_UNLOCKED \ + (rwlock_t) { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \ + .magic = RWLOCK_MAGIC, \ + .owner = SPINLOCK_OWNER_INIT, \ + .owner_cpu = -1 } +# else +# define _RW_LOCK_UNLOCKED \ + (rwlock_t) { .raw_lock = __RAW_RW_LOCK_UNLOCKED } +# endif +# define __RW_LOCK_UNLOCKED(name) _RW_LOCK_UNLOCKED +#endif + +#define RW_LOCK_UNLOCKED __RW_LOCK_UNLOCKED(rw_old_style) + +#define DEFINE_RWLOCK(name) \ + rwlock_t name __cacheline_aligned_in_smp = __RW_LOCK_UNLOCKED(name) + +#ifdef CONFIG_PREEMPT_RT + +/* + * Semaphores - a spinlock plus the semaphore count: + */ +struct semaphore { + atomic_t count; + struct rt_mutex lock; +}; + +#define DECLARE_MUTEX(name) \ +struct semaphore name = \ + { .count = { 1 }, .lock = __RT_MUTEX_INITIALIZER(name.lock) } + +extern void +__sema_init(struct semaphore *sem, int val, char *name, char *file, int line); + +#define rt_sema_init(sem, val) \ + __sema_init(sem, val, #sem, __FILE__, __LINE__) + +extern void +__init_MUTEX(struct semaphore *sem, char *name, char *file, int line); +#define rt_init_MUTEX(sem) \ + __init_MUTEX(sem, #sem, __FILE__, __LINE__) + +extern void there_is_no_init_MUTEX_LOCKED_for_RT_semaphores(void); + +/* + * No locked initialization for RT semaphores + */ +#define rt_init_MUTEX_LOCKED(sem) \ + there_is_no_init_MUTEX_LOCKED_for_RT_semaphores() +extern void rt_down(struct semaphore *sem); +extern int rt_down_interruptible(struct semaphore *sem); +extern int rt_down_timeout(struct semaphore *sem, long jiffies); +extern int rt_down_trylock(struct semaphore *sem); +extern void rt_up(struct semaphore *sem); + +#define rt_sem_is_locked(s) rt_mutex_is_locked(&(s)->lock) +#define rt_sema_count(s) atomic_read(&(s)->count) + +extern int __bad_func_type(void); + +#include + +/* + * PICK_SEM_OP() is a small redirector to allow less typing of the lock + * types struct compat_semaphore, struct semaphore, at the front of the + * PICK_FUNCTION macro. + */ +#define PICK_SEM_OP(...) PICK_FUNCTION(struct compat_semaphore *, \ + struct semaphore *, ##__VA_ARGS__) +#define PICK_SEM_OP_RET(...) PICK_FUNCTION_RET(struct compat_semaphore *,\ + struct semaphore *, ##__VA_ARGS__) + +#define sema_init(sem, val) \ + PICK_SEM_OP(compat_sema_init, rt_sema_init, sem, val) + +#define init_MUTEX(sem) PICK_SEM_OP(compat_init_MUTEX, rt_init_MUTEX, sem) + +#define init_MUTEX_LOCKED(sem) \ + PICK_SEM_OP(compat_init_MUTEX_LOCKED, rt_init_MUTEX_LOCKED, sem) + +#define down(sem) PICK_SEM_OP(compat_down, rt_down, sem) + +#define down_timeout(sem, jiff) \ + PICK_SEM_OP_RET(compat_down_timeout, rt_down_timeout, sem, jiff) + +#define down_interruptible(sem) \ + PICK_SEM_OP_RET(compat_down_interruptible, rt_down_interruptible, sem) + +#define down_trylock(sem) \ + PICK_SEM_OP_RET(compat_down_trylock, rt_down_trylock, sem) + +#define up(sem) PICK_SEM_OP(compat_up, rt_up, sem) + +/* + * rwsems: + */ + +#define __RWSEM_INITIALIZER(name) \ + { .lock = __RT_MUTEX_INITIALIZER(name.lock) } + +#define DECLARE_RWSEM(lockname) \ + struct rw_semaphore lockname = __RWSEM_INITIALIZER(lockname) + +extern void __rt_rwsem_init(struct rw_semaphore *rwsem, char *name, + struct lock_class_key *key); + +# define rt_init_rwsem(sem) \ +do { \ + static struct lock_class_key __key; \ + \ + __rt_rwsem_init((sem), #sem, &__key); \ +} while (0) + +extern void rt_down_write(struct rw_semaphore *rwsem); +extern void +rt_down_read_nested(struct rw_semaphore *rwsem, int subclass); +extern void +rt_down_write_nested(struct rw_semaphore *rwsem, int subclass); +extern void rt_down_read(struct rw_semaphore *rwsem); +#ifdef CONFIG_DEBUG_LOCK_ALLOC +extern void rt_down_read_non_owner(struct rw_semaphore *rwsem); +#else +# define rt_down_read_non_owner(rwsem) rt_down_read(rwsem) +#endif +extern int rt_down_write_trylock(struct rw_semaphore *rwsem); +extern int rt_down_read_trylock(struct rw_semaphore *rwsem); +extern void rt_up_read(struct rw_semaphore *rwsem); +#ifdef CONFIG_DEBUG_LOCK_ALLOC +extern void rt_up_read_non_owner(struct rw_semaphore *rwsem); +#else +# define rt_up_read_non_owner(rwsem) rt_up_read(rwsem) +#endif +extern void rt_up_write(struct rw_semaphore *rwsem); +extern void rt_downgrade_write(struct rw_semaphore *rwsem); + +# define rt_rwsem_is_locked(rws) (rt_mutex_is_locked(&(rws)->lock)) + +#define PICK_RWSEM_OP(...) PICK_FUNCTION(struct compat_rw_semaphore *, \ + struct rw_semaphore *, ##__VA_ARGS__) +#define PICK_RWSEM_OP_RET(...) PICK_FUNCTION_RET(struct compat_rw_semaphore *,\ + struct rw_semaphore *, ##__VA_ARGS__) + +#define init_rwsem(rwsem) PICK_RWSEM_OP(compat_init_rwsem, rt_init_rwsem, rwsem) + +#define down_read(rwsem) PICK_RWSEM_OP(compat_down_read, rt_down_read, rwsem) + +#define down_read_non_owner(rwsem) \ + PICK_RWSEM_OP(compat_down_read_non_owner, rt_down_read_non_owner, rwsem) + +#define down_read_trylock(rwsem) \ + PICK_RWSEM_OP_RET(compat_down_read_trylock, rt_down_read_trylock, rwsem) + +#define down_write(rwsem) PICK_RWSEM_OP(compat_down_write, rt_down_write, rwsem) + +#define down_read_nested(rwsem, subclass) \ + PICK_RWSEM_OP(compat_down_read_nested, rt_down_read_nested, \ + rwsem, subclass) + +#define down_write_nested(rwsem, subclass) \ + PICK_RWSEM_OP(compat_down_write_nested, rt_down_write_nested, \ + rwsem, subclass) + +#define down_write_trylock(rwsem) \ + PICK_RWSEM_OP_RET(compat_down_write_trylock, rt_down_write_trylock,\ + rwsem) + +#define up_read(rwsem) PICK_RWSEM_OP(compat_up_read, rt_up_read, rwsem) + +#define up_read_non_owner(rwsem) \ + PICK_RWSEM_OP(compat_up_read_non_owner, rt_up_read_non_owner, rwsem) + +#define up_write(rwsem) PICK_RWSEM_OP(compat_up_write, rt_up_write, rwsem) + +#define downgrade_write(rwsem) \ + PICK_RWSEM_OP(compat_downgrade_write, rt_downgrade_write, rwsem) + +#define rwsem_is_locked(rwsem) \ + PICK_RWSEM_OP_RET(compat_rwsem_is_locked, rt_rwsem_is_locked, rwsem) + +#endif /* CONFIG_PREEMPT_RT */ + +#endif + Index: linux-2.6.26/include/linux/rtmutex.h =================================================================== --- linux-2.6.26.orig/include/linux/rtmutex.h +++ linux-2.6.26/include/linux/rtmutex.h @@ -24,7 +24,7 @@ * @owner: the mutex owner */ struct rt_mutex { - spinlock_t wait_lock; + raw_spinlock_t wait_lock; struct plist_head wait_list; struct task_struct *owner; #ifdef CONFIG_DEBUG_RT_MUTEXES @@ -63,7 +63,7 @@ struct hrtimer_sleeper; #endif #define __RT_MUTEX_INITIALIZER(mutexname) \ - { .wait_lock = __SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \ + { .wait_lock = RAW_SPIN_LOCK_UNLOCKED(mutexname) \ , .wait_list = PLIST_HEAD_INIT(mutexname.wait_list, mutexname.wait_lock) \ , .owner = NULL \ __DEBUG_RT_MUTEX_INITIALIZER(mutexname)} @@ -88,6 +88,8 @@ extern void rt_mutex_destroy(struct rt_m extern void rt_mutex_lock(struct rt_mutex *lock); extern int rt_mutex_lock_interruptible(struct rt_mutex *lock, int detect_deadlock); +extern int rt_mutex_lock_killable(struct rt_mutex *lock, + int detect_deadlock); extern int rt_mutex_timed_lock(struct rt_mutex *lock, struct hrtimer_sleeper *timeout, int detect_deadlock); Index: linux-2.6.26/include/linux/rwsem-spinlock.h =================================================================== --- linux-2.6.26.orig/include/linux/rwsem-spinlock.h +++ linux-2.6.26/include/linux/rwsem-spinlock.h @@ -28,7 +28,7 @@ struct rwsem_waiter; * - if activity is -1 then there is one active writer * - if wait_list is not empty, then there are processes waiting for the semaphore */ -struct rw_semaphore { +struct compat_rw_semaphore { __s32 activity; spinlock_t wait_lock; struct list_head wait_list; @@ -43,33 +43,32 @@ struct rw_semaphore { # define __RWSEM_DEP_MAP_INIT(lockname) #endif -#define __RWSEM_INITIALIZER(name) \ -{ 0, __SPIN_LOCK_UNLOCKED(name.wait_lock), LIST_HEAD_INIT((name).wait_list) \ - __RWSEM_DEP_MAP_INIT(name) } +#define __COMPAT_RWSEM_INITIALIZER(name) \ +{ 0, SPIN_LOCK_UNLOCKED, LIST_HEAD_INIT((name).wait_list) __RWSEM_DEP_MAP_INIT(name) } -#define DECLARE_RWSEM(name) \ - struct rw_semaphore name = __RWSEM_INITIALIZER(name) +#define COMPAT_DECLARE_RWSEM(name) \ + struct compat_rw_semaphore name = __COMPAT_RWSEM_INITIALIZER(name) -extern void __init_rwsem(struct rw_semaphore *sem, const char *name, +extern void __compat_init_rwsem(struct compat_rw_semaphore *sem, const char *name, struct lock_class_key *key); -#define init_rwsem(sem) \ +#define compat_init_rwsem(sem) \ do { \ static struct lock_class_key __key; \ \ - __init_rwsem((sem), #sem, &__key); \ + __compat_init_rwsem((sem), #sem, &__key); \ } while (0) -extern void __down_read(struct rw_semaphore *sem); -extern int __down_read_trylock(struct rw_semaphore *sem); -extern void __down_write(struct rw_semaphore *sem); -extern void __down_write_nested(struct rw_semaphore *sem, int subclass); -extern int __down_write_trylock(struct rw_semaphore *sem); -extern void __up_read(struct rw_semaphore *sem); -extern void __up_write(struct rw_semaphore *sem); -extern void __downgrade_write(struct rw_semaphore *sem); +extern void __down_read(struct compat_rw_semaphore *sem); +extern int __down_read_trylock(struct compat_rw_semaphore *sem); +extern void __down_write(struct compat_rw_semaphore *sem); +extern void __down_write_nested(struct compat_rw_semaphore *sem, int subclass); +extern int __down_write_trylock(struct compat_rw_semaphore *sem); +extern void __up_read(struct compat_rw_semaphore *sem); +extern void __up_write(struct compat_rw_semaphore *sem); +extern void __downgrade_write(struct compat_rw_semaphore *sem); -static inline int rwsem_is_locked(struct rw_semaphore *sem) +static inline int compat_rwsem_is_locked(struct compat_rw_semaphore *sem) { return (sem->activity != 0); } Index: linux-2.6.26/include/linux/rwsem.h =================================================================== --- linux-2.6.26.orig/include/linux/rwsem.h +++ linux-2.6.26/include/linux/rwsem.h @@ -9,53 +9,68 @@ #include +#ifdef CONFIG_PREEMPT_RT +# include +#endif + #include #include #include #include -struct rw_semaphore; +#ifndef CONFIG_PREEMPT_RT +/* + * On !PREEMPT_RT all rw-semaphores are compat: + */ +#define compat_rw_semaphore rw_semaphore +#endif + +struct compat_rw_semaphore; #ifdef CONFIG_RWSEM_GENERIC_SPINLOCK -#include /* use a generic implementation */ +# include /* use a generic implementation */ +# ifndef CONFIG_PREEMPT_RT +# define __RWSEM_INITIALIZER __COMPAT_RWSEM_INITIALIZER +# define DECLARE_RWSEM COMPAT_DECLARE_RWSEM +# endif #else -#include /* use an arch-specific implementation */ +# include /* use an arch-specific implementation */ #endif /* * lock for reading */ -extern void down_read(struct rw_semaphore *sem); +extern void compat_down_read(struct compat_rw_semaphore *sem); /* * trylock for reading -- returns 1 if successful, 0 if contention */ -extern int down_read_trylock(struct rw_semaphore *sem); +extern int compat_down_read_trylock(struct compat_rw_semaphore *sem); /* * lock for writing */ -extern void down_write(struct rw_semaphore *sem); +extern void compat_down_write(struct compat_rw_semaphore *sem); /* * trylock for writing -- returns 1 if successful, 0 if contention */ -extern int down_write_trylock(struct rw_semaphore *sem); +extern int compat_down_write_trylock(struct compat_rw_semaphore *sem); /* * release a read lock */ -extern void up_read(struct rw_semaphore *sem); +extern void compat_up_read(struct compat_rw_semaphore *sem); /* * release a write lock */ -extern void up_write(struct rw_semaphore *sem); +extern void compat_up_write(struct compat_rw_semaphore *sem); /* * downgrade write lock to read lock */ -extern void downgrade_write(struct rw_semaphore *sem); +extern void compat_downgrade_write(struct compat_rw_semaphore *sem); #ifdef CONFIG_DEBUG_LOCK_ALLOC /* @@ -71,21 +86,78 @@ extern void downgrade_write(struct rw_se * lockdep_set_class() at lock initialization time. * See Documentation/lockdep-design.txt for more details.) */ -extern void down_read_nested(struct rw_semaphore *sem, int subclass); -extern void down_write_nested(struct rw_semaphore *sem, int subclass); +extern void +compat_down_read_nested(struct compat_rw_semaphore *sem, int subclass); +extern void +compat_down_write_nested(struct compat_rw_semaphore *sem, int subclass); /* * Take/release a lock when not the owner will release it. * * [ This API should be avoided as much as possible - the * proper abstraction for this case is completions. ] */ -extern void down_read_non_owner(struct rw_semaphore *sem); -extern void up_read_non_owner(struct rw_semaphore *sem); +extern void +compat_down_read_non_owner(struct compat_rw_semaphore *sem); +extern void +compat_up_read_non_owner(struct compat_rw_semaphore *sem); #else -# define down_read_nested(sem, subclass) down_read(sem) -# define down_write_nested(sem, subclass) down_write(sem) -# define down_read_non_owner(sem) down_read(sem) -# define up_read_non_owner(sem) up_read(sem) +# define compat_down_read_nested(sem, subclass) compat_down_read(sem) +# define compat_down_write_nested(sem, subclass) compat_down_write(sem) +# define compat_down_read_non_owner(sem) compat_down_read(sem) +# define compat_up_read_non_owner(sem) compat_up_read(sem) #endif +#ifndef CONFIG_PREEMPT_RT + +#define DECLARE_RWSEM COMPAT_DECLARE_RWSEM + +/* + * NOTE, lockdep: this has to be a macro, so that separate class-keys + * get generated by the compiler, if the same function does multiple + * init_rwsem() calls to different rwsems. + */ +#define init_rwsem(rwsem) compat_init_rwsem(rwsem) + +static inline void down_read(struct compat_rw_semaphore *rwsem) +{ + compat_down_read(rwsem); +} +static inline int down_read_trylock(struct compat_rw_semaphore *rwsem) +{ + return compat_down_read_trylock(rwsem); +} +static inline void down_write(struct compat_rw_semaphore *rwsem) +{ + compat_down_write(rwsem); +} +static inline int down_write_trylock(struct compat_rw_semaphore *rwsem) +{ + return compat_down_write_trylock(rwsem); +} +static inline void up_read(struct compat_rw_semaphore *rwsem) +{ + compat_up_read(rwsem); +} +static inline void up_write(struct compat_rw_semaphore *rwsem) +{ + compat_up_write(rwsem); +} +static inline void downgrade_write(struct compat_rw_semaphore *rwsem) +{ + compat_downgrade_write(rwsem); +} +static inline int rwsem_is_locked(struct compat_rw_semaphore *sem) +{ + return compat_rwsem_is_locked(sem); +} +# define down_read_nested(sem, subclass) \ + compat_down_read_nested(sem, subclass) +# define down_write_nested(sem, subclass) \ + compat_down_write_nested(sem, subclass) +# define down_read_non_owner(sem) \ + compat_down_read_non_owner(sem) +# define up_read_non_owner(sem) \ + compat_up_read_non_owner(sem) +#endif /* !CONFIG_PREEMPT_RT */ + #endif /* _LINUX_RWSEM_H */ Index: linux-2.6.26/include/linux/sched.h =================================================================== --- linux-2.6.26.orig/include/linux/sched.h +++ linux-2.6.26/include/linux/sched.h @@ -171,6 +171,7 @@ print_cfs_rq(struct seq_file *m, int cpu #endif extern unsigned long long time_sync_thresh; +extern struct semaphore kernel_sem; /* * Task state bitmask. NOTE! These bits are also @@ -183,16 +184,18 @@ extern unsigned long long time_sync_thre * mistake. */ #define TASK_RUNNING 0 -#define TASK_INTERRUPTIBLE 1 -#define TASK_UNINTERRUPTIBLE 2 -#define __TASK_STOPPED 4 -#define __TASK_TRACED 8 +#define TASK_RUNNING_MUTEX 1 +#define TASK_INTERRUPTIBLE 2 +#define TASK_UNINTERRUPTIBLE 4 +#define __TASK_STOPPED 8 +#define __TASK_TRACED 16 /* in tsk->exit_state */ -#define EXIT_ZOMBIE 16 -#define EXIT_DEAD 32 +#define EXIT_ZOMBIE 32 +#define EXIT_DEAD 64 /* in tsk->state again */ -#define TASK_DEAD 64 -#define TASK_WAKEKILL 128 +#define TASK_NONINTERACTIVE 128 +#define TASK_DEAD 256 +#define TASK_WAKEKILL 512 /* Convenience macros for the sake of set_task_state */ #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) @@ -201,10 +204,12 @@ extern unsigned long long time_sync_thre /* Convenience macros for the sake of wake_up */ #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) -#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) +#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED | \ + TASK_RUNNING_MUTEX) /* get_task_state() */ -#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ +#define TASK_REPORT (TASK_RUNNING | TASK_RUNNING_MUTEX | \ + TASK_INTERRUPTIBLE | \ TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ __TASK_TRACED) @@ -1244,7 +1249,7 @@ struct task_struct { spinlock_t alloc_lock; /* Protection of the PI data structures: */ - spinlock_t pi_lock; + raw_spinlock_t pi_lock; #ifdef CONFIG_RT_MUTEXES /* PI waiters blocked on a rt_mutex held by this task */ @@ -1287,6 +1292,25 @@ struct task_struct { unsigned long preempt_trace_parent_eip[MAX_PREEMPT_TRACE]; #endif +#define MAX_LOCK_STACK MAX_PREEMPT_TRACE +#ifdef CONFIG_DEBUG_PREEMPT + int lock_count; +# ifdef CONFIG_PREEMPT_RT + struct rt_mutex *owned_lock[MAX_LOCK_STACK]; +# endif +#endif +#ifdef CONFIG_DETECT_SOFTLOCKUP + unsigned long softlockup_count; /* Count to keep track how long the + * thread is in the kernel without + * sleeping. + */ +#endif + /* realtime bits */ + +#ifdef CONFIG_DEBUG_RT_MUTEXES + void *last_kernel_lock; +#endif + /* journalling filesystem info */ void *journal_info; @@ -1536,6 +1560,7 @@ static inline void put_task_struct(struc #define PF_EXITING 0x00000004 /* getting shut down */ #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ +#define PF_NOSCHED 0x00000020 /* Userspace does not expect scheduling */ #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ #define PF_DUMPCORE 0x00000200 /* dumped core */ @@ -1717,6 +1742,7 @@ extern struct task_struct *curr_task(int extern void set_curr_task(int cpu, struct task_struct *p); void yield(void); +void __yield(void); /* * The default (Linux) execution domain. @@ -1791,6 +1817,9 @@ extern void do_timer(unsigned long ticks extern int wake_up_state(struct task_struct *tsk, unsigned int state); extern int wake_up_process(struct task_struct *tsk); +extern int wake_up_process_mutex(struct task_struct * tsk); +extern int wake_up_process_sync(struct task_struct * tsk); +extern int wake_up_process_mutex_sync(struct task_struct * tsk); extern void wake_up_new_task(struct task_struct *tsk, unsigned long clone_flags); #ifdef CONFIG_SMP @@ -2120,7 +2149,13 @@ static inline int cond_resched(void) return _cond_resched(); } #endif -extern int cond_resched_lock(spinlock_t * lock); +extern int __cond_resched_raw_spinlock(raw_spinlock_t *lock); +extern int __cond_resched_spinlock(spinlock_t *spinlock); + +#define cond_resched_lock(lock) \ + PICK_SPIN_OP_RET(__cond_resched_raw_spinlock, __cond_resched_spinlock,\ + lock) + extern int cond_resched_softirq(void); static inline int cond_resched_bkl(void) { @@ -2134,7 +2169,7 @@ extern int cond_resched_hardirq_context( * task waiting?: (technically does not depend on CONFIG_PREEMPT, * but a general need for low latency) */ -static inline int spin_needbreak(spinlock_t *lock) +static inline int __raw_spin_needbreak(raw_spinlock_t *lock) { #ifdef CONFIG_PREEMPT return spin_is_contended(lock); @@ -2143,6 +2178,23 @@ static inline int spin_needbreak(spinloc #endif } +#ifdef CONFIG_PREEMPT_RT +static inline int __spin_needbreak(spinlock_t *lock) +{ + return lock->break_lock; +} +#else +static inline int __spin_needbreak(spinlock_t *lock) +{ + /* should never be call outside of RT */ + BUG(); + return 0; +} +#endif + +#define spin_needbreak(lock) \ + PICK_SPIN_OP_RET(__raw_spin_needbreak, __spin_needbreak, lock) + static inline int softirq_need_resched(void) { if (softirq_preemption && (current->flags & PF_SOFTIRQ)) @@ -2316,7 +2368,7 @@ static inline void mm_init_owner(struct } #endif /* CONFIG_MM_OWNER */ -#define TASK_STATE_TO_CHAR_STR "RSDTtZX" +#define TASK_STATE_TO_CHAR_STR "RMSDTtZX" #endif /* __KERNEL__ */ Index: linux-2.6.26/include/linux/semaphore.h =================================================================== --- linux-2.6.26.orig/include/linux/semaphore.h +++ linux-2.6.26/include/linux/semaphore.h @@ -9,43 +9,87 @@ #ifndef __LINUX_SEMAPHORE_H #define __LINUX_SEMAPHORE_H -#include -#include +#ifndef CONFIG_PREEMPT_RT +# define compat_semaphore semaphore +#endif + +# include +# include /* Please don't access any members of this structure directly */ -struct semaphore { +struct compat_semaphore { spinlock_t lock; unsigned int count; struct list_head wait_list; }; -#define __SEMAPHORE_INITIALIZER(name, n) \ +#define __COMPAT_SEMAPHORE_INITIALIZER(name, n) \ { \ .lock = __SPIN_LOCK_UNLOCKED((name).lock), \ .count = n, \ .wait_list = LIST_HEAD_INIT((name).wait_list), \ } -#define __DECLARE_SEMAPHORE_GENERIC(name, count) \ - struct semaphore name = __SEMAPHORE_INITIALIZER(name, count) +#define __COMPAT_DECLARE_SEMAPHORE_GENERIC(name, count) \ + struct compat_semaphore name = __COMPAT_SEMAPHORE_INITIALIZER(name, count) -#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name, 1) +#define COMPAT_DECLARE_MUTEX(name) __COMPAT_DECLARE_SEMAPHORE_GENERIC(name, 1) -static inline void sema_init(struct semaphore *sem, int val) +static inline void compat_sema_init(struct compat_semaphore *sem, int val) { static struct lock_class_key __key; - *sem = (struct semaphore) __SEMAPHORE_INITIALIZER(*sem, val); + *sem = (struct compat_semaphore) __COMPAT_SEMAPHORE_INITIALIZER(*sem, val); lockdep_init_map(&sem->lock.dep_map, "semaphore->lock", &__key, 0); } -#define init_MUTEX(sem) sema_init(sem, 1) -#define init_MUTEX_LOCKED(sem) sema_init(sem, 0) +#define compat_init_MUTEX(sem) compat_sema_init(sem, 1) +#define compat_init_MUTEX_LOCKED(sem) compat_sema_init(sem, 0) + +extern void compat_down(struct compat_semaphore *sem); +extern int __must_check compat_down_interruptible(struct compat_semaphore *sem); +extern int __must_check compat_down_killable(struct compat_semaphore *sem); +extern int __must_check compat_down_trylock(struct compat_semaphore *sem); +extern int __must_check compat_down_timeout(struct compat_semaphore *sem, long jiffies); +extern void compat_up(struct compat_semaphore *sem); + +#ifdef CONFIG_PREEMPT_RT +# include +#else +#define DECLARE_MUTEX COMPAT_DECLARE_MUTEX -extern void down(struct semaphore *sem); -extern int __must_check down_interruptible(struct semaphore *sem); -extern int __must_check down_killable(struct semaphore *sem); -extern int __must_check down_trylock(struct semaphore *sem); -extern int __must_check down_timeout(struct semaphore *sem, long jiffies); -extern void up(struct semaphore *sem); +static inline void sema_init(struct compat_semaphore *sem, int val) +{ + compat_sema_init(sem, val); +} +static inline void init_MUTEX(struct compat_semaphore *sem) +{ + compat_init_MUTEX(sem); +} +static inline void init_MUTEX_LOCKED(struct compat_semaphore *sem) +{ + compat_init_MUTEX_LOCKED(sem); +} +static inline void down(struct compat_semaphore *sem) +{ + compat_down(sem); +} +static inline int down_interruptible(struct compat_semaphore *sem) +{ + return compat_down_interruptible(sem); +} +static inline int down_trylock(struct compat_semaphore *sem) +{ + return compat_down_trylock(sem); +} +static inline int down_timeout(struct compat_semaphore *sem, long jiffies) +{ + return compat_down_timeout(sem, jiffies); +} + +static inline void up(struct compat_semaphore *sem) +{ + compat_up(sem); +} +#endif /* CONFIG_PREEMPT_RT */ #endif /* __LINUX_SEMAPHORE_H */ Index: linux-2.6.26/include/linux/seqlock.h =================================================================== --- linux-2.6.26.orig/include/linux/seqlock.h +++ linux-2.6.26/include/linux/seqlock.h @@ -32,46 +32,80 @@ typedef struct { unsigned sequence; spinlock_t lock; -} seqlock_t; +} __seqlock_t; + +typedef struct { + unsigned sequence; + raw_spinlock_t lock; +} __raw_seqlock_t; + +#define seqlock_need_resched(seq) lock_need_resched(&(seq)->lock) + +#ifdef CONFIG_PREEMPT_RT +typedef __seqlock_t seqlock_t; +#else +typedef __raw_seqlock_t seqlock_t; +#endif + +typedef __raw_seqlock_t raw_seqlock_t; /* * These macros triggered gcc-3.x compile-time problems. We think these are * OK now. Be cautious. */ -#define __SEQLOCK_UNLOCKED(lockname) \ - { 0, __SPIN_LOCK_UNLOCKED(lockname) } +#define __RAW_SEQLOCK_UNLOCKED(lockname) \ + { 0, RAW_SPIN_LOCK_UNLOCKED(lockname) } + +#ifdef CONFIG_PREEMPT_RT +# define __SEQLOCK_UNLOCKED(lockname) { 0, __SPIN_LOCK_UNLOCKED(lockname) } +#else +# define __SEQLOCK_UNLOCKED(lockname) __RAW_SEQLOCK_UNLOCKED(lockname) +#endif #define SEQLOCK_UNLOCKED \ __SEQLOCK_UNLOCKED(old_style_seqlock_init) -#define seqlock_init(x) \ - do { \ - (x)->sequence = 0; \ - spin_lock_init(&(x)->lock); \ - } while (0) +#define raw_seqlock_init(x) \ + do { *(x) = (raw_seqlock_t) __RAW_SEQLOCK_UNLOCKED(x); spin_lock_init(&(x)->lock); } while (0) + +#define seqlock_init(x) \ + do { *(x) = (seqlock_t) __SEQLOCK_UNLOCKED(x); spin_lock_init(&(x)->lock); } while (0) #define DEFINE_SEQLOCK(x) \ seqlock_t x = __SEQLOCK_UNLOCKED(x) +#define DEFINE_RAW_SEQLOCK(name) \ + raw_seqlock_t name __cacheline_aligned_in_smp = \ + __RAW_SEQLOCK_UNLOCKED(name) + + /* Lock out other writers and update the count. * Acts like a normal spin_lock/unlock. * Don't need preempt_disable() because that is in the spin_lock already. */ -static inline void write_seqlock(seqlock_t *sl) +static inline void __write_seqlock(seqlock_t *sl) { spin_lock(&sl->lock); ++sl->sequence; smp_wmb(); } -static inline void write_sequnlock(seqlock_t *sl) +static __always_inline unsigned long __write_seqlock_irqsave(seqlock_t *sl) +{ + __write_seqlock(sl); + return 0; +} + +static inline void __write_sequnlock(seqlock_t *sl) { smp_wmb(); sl->sequence++; spin_unlock(&sl->lock); } -static inline int write_tryseqlock(seqlock_t *sl) +#define __write_sequnlock_irqrestore(sl, flags) __write_sequnlock(sl) + +static inline int __write_tryseqlock(seqlock_t *sl) { int ret = spin_trylock(&sl->lock); @@ -83,7 +117,7 @@ static inline int write_tryseqlock(seqlo } /* Start of read calculation -- fetch last complete writer token */ -static __always_inline unsigned read_seqbegin(const seqlock_t *sl) +static __always_inline unsigned __read_seqbegin(const seqlock_t *sl) { unsigned ret; @@ -103,13 +137,195 @@ repeat: * * If sequence value changed then writer changed data while in section. */ -static __always_inline int read_seqretry(const seqlock_t *sl, unsigned start) +static inline int __read_seqretry(seqlock_t *sl, unsigned iv) +{ + int ret; + + smp_rmb(); + ret = (iv & 1) | (sl->sequence ^ iv); + /* + * If invalid then serialize with the writer, to make sure we + * are not livelocking it: + */ + if (unlikely(ret)) { + unsigned long flags; + spin_lock_irqsave(&sl->lock, flags); + spin_unlock_irqrestore(&sl->lock, flags); + } + return ret; +} + +static __always_inline void __write_seqlock_raw(raw_seqlock_t *sl) +{ + spin_lock(&sl->lock); + ++sl->sequence; + smp_wmb(); +} + +static __always_inline unsigned long +__write_seqlock_irqsave_raw(raw_seqlock_t *sl) +{ + unsigned long flags; + + local_irq_save(flags); + __write_seqlock_raw(sl); + return flags; +} + +static __always_inline void __write_seqlock_irq_raw(raw_seqlock_t *sl) +{ + local_irq_disable(); + __write_seqlock_raw(sl); +} + +static __always_inline void __write_seqlock_bh_raw(raw_seqlock_t *sl) +{ + local_bh_disable(); + __write_seqlock_raw(sl); +} + +static __always_inline void __write_sequnlock_raw(raw_seqlock_t *sl) +{ + smp_wmb(); + sl->sequence++; + spin_unlock(&sl->lock); +} + +static __always_inline void +__write_sequnlock_irqrestore_raw(raw_seqlock_t *sl, unsigned long flags) +{ + __write_sequnlock_raw(sl); + local_irq_restore(flags); + preempt_check_resched(); +} + +static __always_inline void __write_sequnlock_irq_raw(raw_seqlock_t *sl) +{ + __write_sequnlock_raw(sl); + local_irq_enable(); + preempt_check_resched(); +} + +static __always_inline void __write_sequnlock_bh_raw(raw_seqlock_t *sl) +{ + __write_sequnlock_raw(sl); + local_bh_enable(); +} + +static __always_inline int __write_tryseqlock_raw(raw_seqlock_t *sl) +{ + int ret = spin_trylock(&sl->lock); + + if (ret) { + ++sl->sequence; + smp_wmb(); + } + return ret; +} + +static __always_inline unsigned __read_seqbegin_raw(const raw_seqlock_t *sl) +{ + unsigned ret = sl->sequence; + smp_rmb(); + return ret; +} + +static __always_inline int __read_seqretry_raw(const raw_seqlock_t *sl, unsigned start) { smp_rmb(); return (sl->sequence != start); } +extern int __bad_seqlock_type(void); + +/* + * PICK_SEQ_OP() is a small redirector to allow less typing of the lock + * types raw_seqlock_t, seqlock_t, at the front of the PICK_FUNCTION + * macro. + */ +#define PICK_SEQ_OP(...) \ + PICK_FUNCTION(raw_seqlock_t *, seqlock_t *, ##__VA_ARGS__) +#define PICK_SEQ_OP_RET(...) \ + PICK_FUNCTION_RET(raw_seqlock_t *, seqlock_t *, ##__VA_ARGS__) + +#define write_seqlock(sl) PICK_SEQ_OP(__write_seqlock_raw, __write_seqlock, sl) + +#define write_sequnlock(sl) \ + PICK_SEQ_OP(__write_sequnlock_raw, __write_sequnlock, sl) + +#define write_tryseqlock(sl) \ + PICK_SEQ_OP_RET(__write_tryseqlock_raw, __write_tryseqlock, sl) + +#define read_seqbegin(sl) \ + PICK_SEQ_OP_RET(__read_seqbegin_raw, __read_seqbegin, sl) + +#define read_seqretry(sl, iv) \ + PICK_SEQ_OP_RET(__read_seqretry_raw, __read_seqretry, sl, iv) + +#define write_seqlock_irqsave(lock, flags) \ +do { \ + flags = PICK_SEQ_OP_RET(__write_seqlock_irqsave_raw, \ + __write_seqlock_irqsave, lock); \ +} while (0) + +#define write_seqlock_irq(lock) \ + PICK_SEQ_OP(__write_seqlock_irq_raw, __write_seqlock, lock) + +#define write_seqlock_bh(lock) \ + PICK_SEQ_OP(__write_seqlock_bh_raw, __write_seqlock, lock) + +#define write_sequnlock_irqrestore(lock, flags) \ + PICK_SEQ_OP(__write_sequnlock_irqrestore_raw, \ + __write_sequnlock_irqrestore, lock, flags) + +#define write_sequnlock_bh(lock) \ + PICK_SEQ_OP(__write_sequnlock_bh_raw, __write_sequnlock, lock) + +#define write_sequnlock_irq(lock) \ + PICK_SEQ_OP(__write_sequnlock_irq_raw, __write_sequnlock, lock) + +static __always_inline +unsigned long __read_seqbegin_irqsave_raw(raw_seqlock_t *sl) +{ + unsigned long flags; + + local_irq_save(flags); + __read_seqbegin_raw(sl); + return flags; +} + +static __always_inline unsigned long __read_seqbegin_irqsave(seqlock_t *sl) +{ + __read_seqbegin(sl); + return 0; +} + +#define read_seqbegin_irqsave(lock, flags) \ +do { \ + flags = PICK_SEQ_OP_RET(__read_seqbegin_irqsave_raw, \ + __read_seqbegin_irqsave, lock); \ +} while (0) + +static __always_inline int +__read_seqretry_irqrestore(seqlock_t *sl, unsigned iv, unsigned long flags) +{ + return __read_seqretry(sl, iv); +} + +static __always_inline int +__read_seqretry_irqrestore_raw(raw_seqlock_t *sl, unsigned iv, + unsigned long flags) +{ + int ret = read_seqretry(sl, iv); + local_irq_restore(flags); + preempt_check_resched(); + return ret; +} + +#define read_seqretry_irqrestore(lock, iv, flags) \ + PICK_SEQ_OP_RET(__read_seqretry_irqrestore_raw, \ + __read_seqretry_irqrestore, lock, iv, flags) /* * Version using sequence counter only. @@ -166,32 +382,4 @@ static inline void write_seqcount_end(se smp_wmb(); s->sequence++; } - -/* - * Possible sw/hw IRQ protected versions of the interfaces. - */ -#define write_seqlock_irqsave(lock, flags) \ - do { local_irq_save(flags); write_seqlock(lock); } while (0) -#define write_seqlock_irq(lock) \ - do { local_irq_disable(); write_seqlock(lock); } while (0) -#define write_seqlock_bh(lock) \ - do { local_bh_disable(); write_seqlock(lock); } while (0) - -#define write_sequnlock_irqrestore(lock, flags) \ - do { write_sequnlock(lock); local_irq_restore(flags); } while(0) -#define write_sequnlock_irq(lock) \ - do { write_sequnlock(lock); local_irq_enable(); } while(0) -#define write_sequnlock_bh(lock) \ - do { write_sequnlock(lock); local_bh_enable(); } while(0) - -#define read_seqbegin_irqsave(lock, flags) \ - ({ local_irq_save(flags); read_seqbegin(lock); }) - -#define read_seqretry_irqrestore(lock, iv, flags) \ - ({ \ - int ret = read_seqretry(lock, iv); \ - local_irq_restore(flags); \ - ret; \ - }) - #endif /* __LINUX_SEQLOCK_H */ Index: linux-2.6.26/include/linux/spinlock.h =================================================================== --- linux-2.6.26.orig/include/linux/spinlock.h +++ linux-2.6.26/include/linux/spinlock.h @@ -44,6 +44,42 @@ * builds the _spin_*() APIs. * * linux/spinlock.h: builds the final spin_*() APIs. + * + * + * Public types and naming conventions: + * ------------------------------------ + * spinlock_t: type: sleep-lock + * raw_spinlock_t: type: spin-lock (debug) + * + * spin_lock([raw_]spinlock_t): API: acquire lock, both types + * + * + * Internal types and naming conventions: + * ------------------------------------- + * __raw_spinlock_t: type: lowlevel spin-lock + * + * _spin_lock(struct rt_mutex): API: acquire sleep-lock + * __spin_lock(raw_spinlock_t): API: acquire spin-lock (highlevel) + * _raw_spin_lock(raw_spinlock_t): API: acquire spin-lock (debug) + * __raw_spin_lock(__raw_spinlock_t): API: acquire spin-lock (lowlevel) + * + * + * spin_lock(raw_spinlock_t) translates into the following chain of + * calls/inlines/macros, if spin-lock debugging is enabled: + * + * spin_lock() [include/linux/spinlock.h] + * -> __spin_lock() [kernel/spinlock.c] + * -> _raw_spin_lock() [lib/spinlock_debug.c] + * -> __raw_spin_lock() [include/asm/spinlock.h] + * + * spin_lock(spinlock_t) translates into the following chain of + * calls/inlines/macros: + * + * spin_lock() [include/linux/spinlock.h] + * -> _spin_lock() [include/linux/spinlock.h] + * -> rt_spin_lock() [kernel/rtmutex.c] + * -> rt_spin_lock_fastlock() [kernel/rtmutex.c] + * -> rt_spin_lock_slowlock() [kernel/rtmutex.c] */ #include @@ -51,29 +87,15 @@ #include #include #include +#include #include #include +#include +#include #include /* - * Must define these before including other files, inline functions need them - */ -#define LOCK_SECTION_NAME ".text.lock."KBUILD_BASENAME - -#define LOCK_SECTION_START(extra) \ - ".subsection 1\n\t" \ - extra \ - ".ifndef " LOCK_SECTION_NAME "\n\t" \ - LOCK_SECTION_NAME ":\n\t" \ - ".endif\n" - -#define LOCK_SECTION_END \ - ".previous\n\t" - -#define __lockfunc __attribute__((section(".spinlock.text"))) - -/* * Pull the raw_spinlock_t and raw_rwlock_t definitions: */ #include @@ -89,36 +111,10 @@ extern int __lockfunc generic__raw_read_ # include #endif -#ifdef CONFIG_DEBUG_SPINLOCK - extern void __spin_lock_init(spinlock_t *lock, const char *name, - struct lock_class_key *key); -# define spin_lock_init(lock) \ -do { \ - static struct lock_class_key __key; \ - \ - __spin_lock_init((lock), #lock, &__key); \ -} while (0) - -#else -# define spin_lock_init(lock) \ - do { *(lock) = SPIN_LOCK_UNLOCKED; } while (0) -#endif - -#ifdef CONFIG_DEBUG_SPINLOCK - extern void __rwlock_init(rwlock_t *lock, const char *name, - struct lock_class_key *key); -# define rwlock_init(lock) \ -do { \ - static struct lock_class_key __key; \ - \ - __rwlock_init((lock), #lock, &__key); \ -} while (0) -#else -# define rwlock_init(lock) \ - do { *(lock) = RW_LOCK_UNLOCKED; } while (0) -#endif - -#define spin_is_locked(lock) __raw_spin_is_locked(&(lock)->raw_lock) +/* + * Pull the RT types: + */ +#include #ifdef CONFIG_GENERIC_LOCKBREAK #define spin_is_contended(lock) ((lock)->break_lock) @@ -126,12 +122,6 @@ do { \ #define spin_is_contended(lock) __raw_spin_is_contended(&(lock)->raw_lock) #endif -/** - * spin_unlock_wait - wait until the spinlock gets unlocked - * @lock: the spinlock in question. - */ -#define spin_unlock_wait(lock) __raw_spin_unlock_wait(&(lock)->raw_lock) - /* * Pull the _spin_*()/_read_*()/_write_*() functions/declarations: */ @@ -142,16 +132,16 @@ do { \ #endif #ifdef CONFIG_DEBUG_SPINLOCK - extern void _raw_spin_lock(spinlock_t *lock); -#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock) - extern int _raw_spin_trylock(spinlock_t *lock); - extern void _raw_spin_unlock(spinlock_t *lock); - extern void _raw_read_lock(rwlock_t *lock); - extern int _raw_read_trylock(rwlock_t *lock); - extern void _raw_read_unlock(rwlock_t *lock); - extern void _raw_write_lock(rwlock_t *lock); - extern int _raw_write_trylock(rwlock_t *lock); - extern void _raw_write_unlock(rwlock_t *lock); + extern __lockfunc void _raw_spin_lock(raw_spinlock_t *lock); +# define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock) + extern __lockfunc int _raw_spin_trylock(raw_spinlock_t *lock); + extern __lockfunc void _raw_spin_unlock(raw_spinlock_t *lock); + extern __lockfunc void _raw_read_lock(raw_rwlock_t *lock); + extern __lockfunc int _raw_read_trylock(raw_rwlock_t *lock); + extern __lockfunc void _raw_read_unlock(raw_rwlock_t *lock); + extern __lockfunc void _raw_write_lock(raw_rwlock_t *lock); + extern __lockfunc int _raw_write_trylock(raw_rwlock_t *lock); + extern __lockfunc void _raw_write_unlock(raw_rwlock_t *lock); #else # define _raw_spin_lock(lock) __raw_spin_lock(&(lock)->raw_lock) # define _raw_spin_lock_flags(lock, flags) \ @@ -166,134 +156,425 @@ do { \ # define _raw_write_unlock(rwlock) __raw_write_unlock(&(rwlock)->raw_lock) #endif -#define read_can_lock(rwlock) __raw_read_can_lock(&(rwlock)->raw_lock) -#define write_can_lock(rwlock) __raw_write_can_lock(&(rwlock)->raw_lock) +extern int __bad_spinlock_type(void); +extern int __bad_rwlock_type(void); + +extern void +__rt_spin_lock_init(spinlock_t *lock, char *name, struct lock_class_key *key); + +extern void __lockfunc rt_spin_lock(spinlock_t *lock); +extern void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass); +extern void __lockfunc rt_spin_unlock(spinlock_t *lock); +extern void __lockfunc rt_spin_unlock_wait(spinlock_t *lock); +extern int __lockfunc +rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags); +extern int __lockfunc rt_spin_trylock(spinlock_t *lock); +extern int _atomic_dec_and_spin_lock(spinlock_t *lock, atomic_t *atomic); /* - * Define the various spin_lock and rw_lock methods. Note we define these - * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various - * methods are defined as nops in the case they are not required. + * lockdep-less calls, for derived types like rwlock: + * (for trylock they can use rt_mutex_trylock() directly. */ -#define spin_trylock(lock) __cond_lock(lock, _spin_trylock(lock)) -#define read_trylock(lock) __cond_lock(lock, _read_trylock(lock)) -#define write_trylock(lock) __cond_lock(lock, _write_trylock(lock)) - -#define spin_lock(lock) _spin_lock(lock) +extern void __lockfunc __rt_spin_lock(struct rt_mutex *lock); +extern void __lockfunc __rt_spin_unlock(struct rt_mutex *lock); -#ifdef CONFIG_DEBUG_LOCK_ALLOC -# define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass) +#ifdef CONFIG_PREEMPT_RT +# define _spin_lock(l) rt_spin_lock(l) +# define _spin_lock_nested(l, s) rt_spin_lock_nested(l, s) +# define _spin_lock_bh(l) rt_spin_lock(l) +# define _spin_lock_irq(l) rt_spin_lock(l) +# define _spin_unlock(l) rt_spin_unlock(l) +# define _spin_unlock_no_resched(l) rt_spin_unlock(l) +# define _spin_unlock_bh(l) rt_spin_unlock(l) +# define _spin_unlock_irq(l) rt_spin_unlock(l) +# define _spin_unlock_irqrestore(l, f) rt_spin_unlock(l) +static inline unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock) +{ + rt_spin_lock(lock); + return 0; +} +static inline unsigned long __lockfunc +_spin_lock_irqsave_nested(spinlock_t *lock, int subclass) +{ + rt_spin_lock_nested(lock, subclass); + return 0; +} #else -# define spin_lock_nested(lock, subclass) _spin_lock(lock) +static inline unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock) +{ + return 0; +} +static inline unsigned long __lockfunc +_spin_lock_irqsave_nested(spinlock_t *lock, int subclass) +{ + return 0; +} +# define _spin_lock(l) do { } while (0) +# define _spin_lock_nested(l, s) do { } while (0) +# define _spin_lock_bh(l) do { } while (0) +# define _spin_lock_irq(l) do { } while (0) +# define _spin_unlock(l) do { } while (0) +# define _spin_unlock_no_resched(l) do { } while (0) +# define _spin_unlock_bh(l) do { } while (0) +# define _spin_unlock_irq(l) do { } while (0) +# define _spin_unlock_irqrestore(l, f) do { } while (0) #endif -#define write_lock(lock) _write_lock(lock) -#define read_lock(lock) _read_lock(lock) +#define _spin_lock_init(sl, n, f, l) \ +do { \ + static struct lock_class_key __key; \ + \ + __rt_spin_lock_init(sl, n, &__key); \ +} while (0) -#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) +# ifdef CONFIG_PREEMPT_RT +# define _spin_can_lock(l) (!rt_mutex_is_locked(&(l)->lock)) +# define _spin_is_locked(l) rt_mutex_is_locked(&(l)->lock) +# define _spin_unlock_wait(l) rt_spin_unlock_wait(l) + +# define _spin_trylock(l) rt_spin_trylock(l) +# define _spin_trylock_bh(l) rt_spin_trylock(l) +# define _spin_trylock_irq(l) rt_spin_trylock(l) +# define _spin_trylock_irqsave(l,f) rt_spin_trylock_irqsave(l, f) +# else + + extern int this_should_never_be_called_on_non_rt(spinlock_t *lock); +# define TSNBCONRT(l) this_should_never_be_called_on_non_rt(l) +# define _spin_can_lock(l) TSNBCONRT(l) +# define _spin_is_locked(l) TSNBCONRT(l) +# define _spin_unlock_wait(l) TSNBCONRT(l) + +# define _spin_trylock(l) TSNBCONRT(l) +# define _spin_trylock_bh(l) TSNBCONRT(l) +# define _spin_trylock_irq(l) TSNBCONRT(l) +# define _spin_trylock_irqsave(l,f) TSNBCONRT(l) +#endif -#define spin_lock_irqsave(lock, flags) flags = _spin_lock_irqsave(lock) -#define read_lock_irqsave(lock, flags) flags = _read_lock_irqsave(lock) -#define write_lock_irqsave(lock, flags) flags = _write_lock_irqsave(lock) +extern void __lockfunc rt_write_lock(rwlock_t *rwlock); +extern void __lockfunc rt_read_lock(rwlock_t *rwlock); +extern int __lockfunc rt_write_trylock(rwlock_t *rwlock); +extern int __lockfunc rt_write_trylock_irqsave(rwlock_t *trylock, + unsigned long *flags); +extern int __lockfunc rt_read_trylock(rwlock_t *rwlock); +extern void __lockfunc rt_write_unlock(rwlock_t *rwlock); +extern void __lockfunc rt_read_unlock(rwlock_t *rwlock); +extern unsigned long __lockfunc rt_write_lock_irqsave(rwlock_t *rwlock); +extern unsigned long __lockfunc rt_read_lock_irqsave(rwlock_t *rwlock); +extern void +__rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key); + +#define _rwlock_init(rwl, n, f, l) \ +do { \ + static struct lock_class_key __key; \ + \ + __rt_rwlock_init(rwl, n, &__key); \ +} while (0) -#ifdef CONFIG_DEBUG_LOCK_ALLOC -#define spin_lock_irqsave_nested(lock, flags, subclass) \ - flags = _spin_lock_irqsave_nested(lock, subclass) +#ifdef CONFIG_PREEMPT_RT +# define rt_read_can_lock(rwl) (!rt_mutex_is_locked(&(rwl)->lock)) +# define rt_write_can_lock(rwl) (!rt_mutex_is_locked(&(rwl)->lock)) #else -#define spin_lock_irqsave_nested(lock, flags, subclass) \ - flags = _spin_lock_irqsave(lock) + extern int rt_rwlock_can_lock_never_call_on_non_rt(rwlock_t *rwlock); +# define rt_read_can_lock(rwl) rt_rwlock_can_lock_never_call_on_non_rt(rwl) +# define rt_write_can_lock(rwl) rt_rwlock_can_lock_never_call_on_non_rt(rwl) #endif +# define _read_can_lock(rwl) rt_read_can_lock(rwl) +# define _write_can_lock(rwl) rt_write_can_lock(rwl) + +# define _read_trylock(rwl) rt_read_trylock(rwl) +# define _write_trylock(rwl) rt_write_trylock(rwl) +# define _write_trylock_irqsave(rwl, flags) \ + rt_write_trylock_irqsave(rwl, flags) + +# define _read_lock(rwl) rt_read_lock(rwl) +# define _write_lock(rwl) rt_write_lock(rwl) +# define _read_unlock(rwl) rt_read_unlock(rwl) +# define _write_unlock(rwl) rt_write_unlock(rwl) + +# define _read_lock_bh(rwl) rt_read_lock(rwl) +# define _write_lock_bh(rwl) rt_write_lock(rwl) +# define _read_unlock_bh(rwl) rt_read_unlock(rwl) +# define _write_unlock_bh(rwl) rt_write_unlock(rwl) + +# define _read_lock_irq(rwl) rt_read_lock(rwl) +# define _write_lock_irq(rwl) rt_write_lock(rwl) +# define _read_unlock_irq(rwl) rt_read_unlock(rwl) +# define _write_unlock_irq(rwl) rt_write_unlock(rwl) + +# define _read_lock_irqsave(rwl) rt_read_lock_irqsave(rwl) +# define _write_lock_irqsave(rwl) rt_write_lock_irqsave(rwl) + +# define _read_unlock_irqrestore(rwl, f) rt_read_unlock(rwl) +# define _write_unlock_irqrestore(rwl, f) rt_write_unlock(rwl) + +#ifdef CONFIG_DEBUG_SPINLOCK + extern void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name, + struct lock_class_key *key); +# define _raw_spin_lock_init(lock, name, file, line) \ +do { \ + static struct lock_class_key __key; \ + \ + __raw_spin_lock_init((lock), #lock, &__key); \ +} while (0) + #else +#define __raw_spin_lock_init(lock) \ + do { *(lock) = RAW_SPIN_LOCK_UNLOCKED(lock); } while (0) +# define _raw_spin_lock_init(lock, name, file, line) __raw_spin_lock_init(lock) +#endif -#define spin_lock_irqsave(lock, flags) _spin_lock_irqsave(lock, flags) -#define read_lock_irqsave(lock, flags) _read_lock_irqsave(lock, flags) -#define write_lock_irqsave(lock, flags) _write_lock_irqsave(lock, flags) -#define spin_lock_irqsave_nested(lock, flags, subclass) \ - spin_lock_irqsave(lock, flags) +/* + * PICK_SPIN_OP()/PICK_RW_OP() are simple redirectors for PICK_FUNCTION + */ +#define PICK_SPIN_OP(...) \ + PICK_FUNCTION(raw_spinlock_t *, spinlock_t *, ##__VA_ARGS__) +#define PICK_SPIN_OP_RET(...) \ + PICK_FUNCTION_RET(raw_spinlock_t *, spinlock_t *, ##__VA_ARGS__) +#define PICK_RW_OP(...) PICK_FUNCTION(raw_rwlock_t *, rwlock_t *, ##__VA_ARGS__) +#define PICK_RW_OP_RET(...) \ + PICK_FUNCTION_RET(raw_rwlock_t *, rwlock_t *, ##__VA_ARGS__) + +#define spin_lock_init(lock) \ + PICK_SPIN_OP(_raw_spin_lock_init, _spin_lock_init, lock, #lock, \ + __FILE__, __LINE__) +#ifdef CONFIG_DEBUG_SPINLOCK + extern void __raw_rwlock_init(raw_rwlock_t *lock, const char *name, + struct lock_class_key *key); +# define _raw_rwlock_init(lock, name, file, line) \ +do { \ + static struct lock_class_key __key; \ + \ + __raw_rwlock_init((lock), #lock, &__key); \ +} while (0) +#else +#define __raw_rwlock_init(lock) \ + do { *(lock) = RAW_RW_LOCK_UNLOCKED(lock); } while (0) +# define _raw_rwlock_init(lock, name, file, line) __raw_rwlock_init(lock) #endif -#define spin_lock_irq(lock) _spin_lock_irq(lock) -#define spin_lock_bh(lock) _spin_lock_bh(lock) +#define rwlock_init(lock) \ + PICK_RW_OP(_raw_rwlock_init, _rwlock_init, lock, #lock, \ + __FILE__, __LINE__) + +#define __spin_is_locked(lock) __raw_spin_is_locked(&(lock)->raw_lock) -#define read_lock_irq(lock) _read_lock_irq(lock) -#define read_lock_bh(lock) _read_lock_bh(lock) +#define spin_is_locked(lock) \ + PICK_SPIN_OP_RET(__spin_is_locked, _spin_is_locked, lock) -#define write_lock_irq(lock) _write_lock_irq(lock) -#define write_lock_bh(lock) _write_lock_bh(lock) +#define __spin_unlock_wait(lock) __raw_spin_unlock_wait(&(lock)->raw_lock) + +#define spin_unlock_wait(lock) \ + PICK_SPIN_OP(__spin_unlock_wait, _spin_unlock_wait, lock) /* - * We inline the unlock functions in the nondebug case: + * Define the various spin_lock and rw_lock methods. Note we define these + * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various + * methods are defined as nops in the case they are not required. */ -#if defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) || \ - !defined(CONFIG_SMP) -# define spin_unlock(lock) _spin_unlock(lock) -# define read_unlock(lock) _read_unlock(lock) -# define write_unlock(lock) _write_unlock(lock) -# define spin_unlock_irq(lock) _spin_unlock_irq(lock) -# define read_unlock_irq(lock) _read_unlock_irq(lock) -# define write_unlock_irq(lock) _write_unlock_irq(lock) +#define spin_trylock(lock) \ + __cond_lock(lock, PICK_SPIN_OP_RET(__spin_trylock, _spin_trylock, lock)) + +#define read_trylock(lock) \ + __cond_lock(lock, PICK_RW_OP_RET(__read_trylock, _read_trylock, lock)) + +#define write_trylock(lock) \ + __cond_lock(lock, PICK_RW_OP_RET(__write_trylock, _write_trylock, lock)) + +#define write_trylock_irqsave(lock, flags) \ + __cond_lock(lock, PICK_RW_OP_RET(__write_trylock_irqsave, \ + _write_trylock_irqsave, lock, &flags)) + +#define __spin_can_lock(lock) __raw_spin_can_lock(&(lock)->raw_lock) +#define __read_can_lock(lock) __raw_read_can_lock(&(lock)->raw_lock) +#define __write_can_lock(lock) __raw_write_can_lock(&(lock)->raw_lock) + +#define read_can_lock(lock) \ + __cond_lock(lock, PICK_RW_OP_RET(__read_can_lock, _read_can_lock, lock)) + +#define write_can_lock(lock) \ + __cond_lock(lock, PICK_RW_OP_RET(__write_can_lock, _write_can_lock,\ + lock)) + +#define spin_lock(lock) PICK_SPIN_OP(__spin_lock, _spin_lock, lock) + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define spin_lock_nested(lock, subclass) \ + PICK_SPIN_OP(__spin_lock_nested, _spin_lock_nested, lock, subclass) #else -# define spin_unlock(lock) \ - do {__raw_spin_unlock(&(lock)->raw_lock); __release(lock); } while (0) -# define read_unlock(lock) \ - do {__raw_read_unlock(&(lock)->raw_lock); __release(lock); } while (0) -# define write_unlock(lock) \ - do {__raw_write_unlock(&(lock)->raw_lock); __release(lock); } while (0) -# define spin_unlock_irq(lock) \ -do { \ - __raw_spin_unlock(&(lock)->raw_lock); \ - __release(lock); \ - local_irq_enable(); \ -} while (0) -# define read_unlock_irq(lock) \ -do { \ - __raw_read_unlock(&(lock)->raw_lock); \ - __release(lock); \ - local_irq_enable(); \ +# define spin_lock_nested(lock, subclass) spin_lock(lock) +#endif + +#define write_lock(lock) PICK_RW_OP(__write_lock, _write_lock, lock) + +#define read_lock(lock) PICK_RW_OP(__read_lock, _read_lock, lock) + +# define spin_lock_irqsave(lock, flags) \ +do { \ + BUILD_CHECK_IRQ_FLAGS(flags); \ + flags = PICK_SPIN_OP_RET(__spin_lock_irqsave, _spin_lock_irqsave, \ + lock); \ } while (0) -# define write_unlock_irq(lock) \ -do { \ - __raw_write_unlock(&(lock)->raw_lock); \ - __release(lock); \ - local_irq_enable(); \ + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define spin_lock_irqsave_nested(lock, flags, subclass) \ +do { \ + BUILD_CHECK_IRQ_FLAGS(flags); \ + flags = PICK_SPIN_OP_RET(__spin_lock_irqsave_nested, \ + _spin_lock_irqsave_nested, lock, subclass); \ } while (0) +#else +# define spin_lock_irqsave_nested(lock, flags, subclass) \ + spin_lock_irqsave(lock, flags) #endif -#define spin_unlock_irqrestore(lock, flags) \ - _spin_unlock_irqrestore(lock, flags) -#define spin_unlock_bh(lock) _spin_unlock_bh(lock) +# define read_lock_irqsave(lock, flags) \ +do { \ + BUILD_CHECK_IRQ_FLAGS(flags); \ + flags = PICK_RW_OP_RET(__read_lock_irqsave, _read_lock_irqsave, lock);\ +} while (0) + +# define write_lock_irqsave(lock, flags) \ +do { \ + BUILD_CHECK_IRQ_FLAGS(flags); \ + flags = PICK_RW_OP_RET(__write_lock_irqsave, _write_lock_irqsave,lock);\ +} while (0) + +#define spin_lock_irq(lock) PICK_SPIN_OP(__spin_lock_irq, _spin_lock_irq, lock) + +#define spin_lock_bh(lock) PICK_SPIN_OP(__spin_lock_bh, _spin_lock_bh, lock) + +#define read_lock_irq(lock) PICK_RW_OP(__read_lock_irq, _read_lock_irq, lock) + +#define read_lock_bh(lock) PICK_RW_OP(__read_lock_bh, _read_lock_bh, lock) -#define read_unlock_irqrestore(lock, flags) \ - _read_unlock_irqrestore(lock, flags) -#define read_unlock_bh(lock) _read_unlock_bh(lock) +#define write_lock_irq(lock) PICK_RW_OP(__write_lock_irq, _write_lock_irq, lock) -#define write_unlock_irqrestore(lock, flags) \ - _write_unlock_irqrestore(lock, flags) -#define write_unlock_bh(lock) _write_unlock_bh(lock) +#define write_lock_bh(lock) PICK_RW_OP(__write_lock_bh, _write_lock_bh, lock) -#define spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock)) +#define spin_unlock(lock) PICK_SPIN_OP(__spin_unlock, _spin_unlock, lock) -#define spin_trylock_irq(lock) \ -({ \ - local_irq_disable(); \ - spin_trylock(lock) ? \ - 1 : ({ local_irq_enable(); 0; }); \ -}) +#define read_unlock(lock) PICK_RW_OP(__read_unlock, _read_unlock, lock) + +#define write_unlock(lock) PICK_RW_OP(__write_unlock, _write_unlock, lock) + +#define spin_unlock_no_resched(lock) \ + PICK_SPIN_OP(__spin_unlock_no_resched, _spin_unlock_no_resched, lock) + +#define spin_unlock_irqrestore(lock, flags) \ +do { \ + BUILD_CHECK_IRQ_FLAGS(flags); \ + PICK_SPIN_OP(__spin_unlock_irqrestore, _spin_unlock_irqrestore, \ + lock, flags); \ +} while (0) + +#define spin_unlock_irq(lock) \ + PICK_SPIN_OP(__spin_unlock_irq, _spin_unlock_irq, lock) +#define spin_unlock_bh(lock) \ + PICK_SPIN_OP(__spin_unlock_bh, _spin_unlock_bh, lock) + +#define read_unlock_irqrestore(lock, flags) \ +do { \ + BUILD_CHECK_IRQ_FLAGS(flags); \ + PICK_RW_OP(__read_unlock_irqrestore, _read_unlock_irqrestore, \ + lock, flags); \ +} while (0) + +#define read_unlock_irq(lock) \ + PICK_RW_OP(__read_unlock_irq, _read_unlock_irq, lock) +#define read_unlock_bh(lock) PICK_RW_OP(__read_unlock_bh, _read_unlock_bh, lock) + +#define write_unlock_irqrestore(lock, flags) \ +do { \ + BUILD_CHECK_IRQ_FLAGS(flags); \ + PICK_RW_OP(__write_unlock_irqrestore, _write_unlock_irqrestore, \ + lock, flags); \ +} while (0) +#define write_unlock_irq(lock) \ + PICK_RW_OP(__write_unlock_irq, _write_unlock_irq, lock) + +#define write_unlock_bh(lock) \ + PICK_RW_OP(__write_unlock_bh, _write_unlock_bh, lock) + +#define spin_trylock_bh(lock) \ + __cond_lock(lock, PICK_SPIN_OP_RET(__spin_trylock_bh, _spin_trylock_bh,\ + lock)) + +#define spin_trylock_irq(lock) \ + __cond_lock(lock, PICK_SPIN_OP_RET(__spin_trylock_irq, \ + _spin_trylock_irq, lock)) #define spin_trylock_irqsave(lock, flags) \ -({ \ - local_irq_save(flags); \ - spin_trylock(lock) ? \ - 1 : ({ local_irq_restore(flags); 0; }); \ -}) + __cond_lock(lock, PICK_SPIN_OP_RET(__spin_trylock_irqsave, \ + _spin_trylock_irqsave, lock, &flags)) -#define write_trylock_irqsave(lock, flags) \ -({ \ - local_irq_save(flags); \ - write_trylock(lock) ? \ - 1 : ({ local_irq_restore(flags); 0; }); \ -}) +/* + * bit-based spin_lock() + * + * Don't use this unless you really need to: spin_lock() and spin_unlock() + * are significantly faster. + */ +static inline void bit_spin_lock(int bitnum, unsigned long *addr) +{ + /* + * Assuming the lock is uncontended, this never enters + * the body of the outer loop. If it is contended, then + * within the inner loop a non-atomic test is used to + * busywait with less bus contention for a good time to + * attempt to acquire the lock bit. + */ +#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) + while (test_and_set_bit(bitnum, addr)) + while (test_bit(bitnum, addr)) + cpu_relax(); +#endif + __acquire(bitlock); +} + +/* + * Return true if it was acquired + */ +static inline int bit_spin_trylock(int bitnum, unsigned long *addr) +{ +#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) + if (test_and_set_bit(bitnum, addr)) + return 0; +#endif + __acquire(bitlock); + return 1; +} + +/* + * bit-based spin_unlock() + */ +static inline void bit_spin_unlock(int bitnum, unsigned long *addr) +{ +#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) + BUG_ON(!test_bit(bitnum, addr)); + smp_mb__before_clear_bit(); + clear_bit(bitnum, addr); +#endif + __release(bitlock); +} + +/* + * Return true if the lock is held. + */ +static inline int bit_spin_is_locked(int bitnum, unsigned long *addr) +{ +#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) + return test_bit(bitnum, addr); +#else + return 1; +#endif +} + +/** + * __raw_spin_can_lock - would __raw_spin_trylock() succeed? + * @lock: the spinlock in question. + */ +#define __raw_spin_can_lock(lock) (!__raw_spin_is_locked(lock)) /* * Pull the atomic_t declaration: @@ -308,14 +589,22 @@ do { \ * Decrements @atomic by 1. If the result is 0, returns true and locks * @lock. Returns false for all other cases. */ -extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock); -#define atomic_dec_and_lock(atomic, lock) \ - __cond_lock(lock, _atomic_dec_and_lock(atomic, lock)) +/* "lock on reference count zero" */ +#ifndef ATOMIC_DEC_AND_LOCK +# include + extern int __atomic_dec_and_spin_lock(raw_spinlock_t *lock, atomic_t *atomic); +#endif + +#define atomic_dec_and_lock(atomic, lock) \ + __cond_lock(lock, PICK_SPIN_OP_RET(__atomic_dec_and_spin_lock, \ + _atomic_dec_and_spin_lock, lock, atomic)) /** * spin_can_lock - would spin_trylock() succeed? * @lock: the spinlock in question. */ -#define spin_can_lock(lock) (!spin_is_locked(lock)) +#define spin_can_lock(lock) \ + __cond_lock(lock, PICK_SPIN_OP_RET(__spin_can_lock, _spin_can_lock,\ + lock)) #endif /* __LINUX_SPINLOCK_H */ Index: linux-2.6.26/include/linux/spinlock_api_smp.h =================================================================== --- linux-2.6.26.orig/include/linux/spinlock_api_smp.h +++ linux-2.6.26/include/linux/spinlock_api_smp.h @@ -19,43 +19,58 @@ int in_lock_functions(unsigned long addr #define assert_spin_locked(x) BUG_ON(!spin_is_locked(x)) -void __lockfunc _spin_lock(spinlock_t *lock) __acquires(lock); -void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass) - __acquires(lock); -void __lockfunc _read_lock(rwlock_t *lock) __acquires(lock); -void __lockfunc _write_lock(rwlock_t *lock) __acquires(lock); -void __lockfunc _spin_lock_bh(spinlock_t *lock) __acquires(lock); -void __lockfunc _read_lock_bh(rwlock_t *lock) __acquires(lock); -void __lockfunc _write_lock_bh(rwlock_t *lock) __acquires(lock); -void __lockfunc _spin_lock_irq(spinlock_t *lock) __acquires(lock); -void __lockfunc _read_lock_irq(rwlock_t *lock) __acquires(lock); -void __lockfunc _write_lock_irq(rwlock_t *lock) __acquires(lock); -unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock) - __acquires(lock); -unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass) - __acquires(lock); -unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock) - __acquires(lock); -unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock) - __acquires(lock); -int __lockfunc _spin_trylock(spinlock_t *lock); -int __lockfunc _read_trylock(rwlock_t *lock); -int __lockfunc _write_trylock(rwlock_t *lock); -int __lockfunc _spin_trylock_bh(spinlock_t *lock); -void __lockfunc _spin_unlock(spinlock_t *lock) __releases(lock); -void __lockfunc _read_unlock(rwlock_t *lock) __releases(lock); -void __lockfunc _write_unlock(rwlock_t *lock) __releases(lock); -void __lockfunc _spin_unlock_bh(spinlock_t *lock) __releases(lock); -void __lockfunc _read_unlock_bh(rwlock_t *lock) __releases(lock); -void __lockfunc _write_unlock_bh(rwlock_t *lock) __releases(lock); -void __lockfunc _spin_unlock_irq(spinlock_t *lock) __releases(lock); -void __lockfunc _read_unlock_irq(rwlock_t *lock) __releases(lock); -void __lockfunc _write_unlock_irq(rwlock_t *lock) __releases(lock); -void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags) - __releases(lock); -void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags) - __releases(lock); -void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags) - __releases(lock); +#define ACQUIRE_SPIN __acquires(lock) +#define ACQUIRE_RW __acquires(lock) +#define RELEASE_SPIN __releases(lock) +#define RELEASE_RW __releases(lock) + +void __lockfunc __spin_lock(raw_spinlock_t *lock) ACQUIRE_SPIN; +void __lockfunc __spin_lock_nested(raw_spinlock_t *lock, int subclass) + ACQUIRE_SPIN; +void __lockfunc __read_lock(raw_rwlock_t *lock) ACQUIRE_RW; +void __lockfunc __write_lock(raw_rwlock_t *lock) ACQUIRE_RW; +void __lockfunc __spin_lock_bh(raw_spinlock_t *lock) ACQUIRE_SPIN; +void __lockfunc __read_lock_bh(raw_rwlock_t *lock) ACQUIRE_RW; +void __lockfunc __write_lock_bh(raw_rwlock_t *lock) ACQUIRE_RW; +void __lockfunc __spin_lock_irq(raw_spinlock_t *lock) ACQUIRE_SPIN; +void __lockfunc __read_lock_irq(raw_rwlock_t *lock) ACQUIRE_RW; +void __lockfunc __write_lock_irq(raw_rwlock_t *lock) ACQUIRE_RW; +unsigned long __lockfunc __spin_lock_irqsave(raw_spinlock_t *lock) + ACQUIRE_SPIN; +unsigned long __lockfunc +__spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass) ACQUIRE_SPIN; +unsigned long __lockfunc __read_lock_irqsave(raw_rwlock_t *lock) + ACQUIRE_RW; +unsigned long __lockfunc __write_lock_irqsave(raw_rwlock_t *lock) + ACQUIRE_RW; +int __lockfunc __spin_trylock(raw_spinlock_t *lock); +int __lockfunc +__spin_trylock_irqsave(raw_spinlock_t *lock, unsigned long *flags); +int __lockfunc __read_trylock(raw_rwlock_t *lock); +int __lockfunc __write_trylock(raw_rwlock_t *lock); +int __lockfunc +__write_trylock_irqsave(raw_rwlock_t *lock, unsigned long *flags); +int __lockfunc __spin_trylock_bh(raw_spinlock_t *lock); +int __lockfunc __spin_trylock_irq(raw_spinlock_t *lock); +void __lockfunc __spin_unlock(raw_spinlock_t *lock) RELEASE_SPIN; +void __lockfunc __spin_unlock_no_resched(raw_spinlock_t *lock) + RELEASE_SPIN; +void __lockfunc __read_unlock(raw_rwlock_t *lock) RELEASE_RW; +void __lockfunc __write_unlock(raw_rwlock_t *lock) RELEASE_RW; +void __lockfunc __spin_unlock_bh(raw_spinlock_t *lock) RELEASE_SPIN; +void __lockfunc __read_unlock_bh(raw_rwlock_t *lock) RELEASE_RW; +void __lockfunc __write_unlock_bh(raw_rwlock_t *lock) RELEASE_RW; +void __lockfunc __spin_unlock_irq(raw_spinlock_t *lock) RELEASE_SPIN; +void __lockfunc __read_unlock_irq(raw_rwlock_t *lock) RELEASE_RW; +void __lockfunc __write_unlock_irq(raw_rwlock_t *lock) RELEASE_RW; +void __lockfunc +__spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags) + RELEASE_SPIN; +void __lockfunc +__read_unlock_irqrestore(raw_rwlock_t *lock, unsigned long flags) + RELEASE_RW; +void +__lockfunc __write_unlock_irqrestore(raw_rwlock_t *lock, unsigned long flags) + RELEASE_RW; #endif /* __LINUX_SPINLOCK_API_SMP_H */ Index: linux-2.6.26/include/linux/spinlock_api_up.h =================================================================== --- linux-2.6.26.orig/include/linux/spinlock_api_up.h +++ linux-2.6.26/include/linux/spinlock_api_up.h @@ -33,12 +33,22 @@ #define __LOCK_IRQ(lock) \ do { local_irq_disable(); __LOCK(lock); } while (0) -#define __LOCK_IRQSAVE(lock, flags) \ - do { local_irq_save(flags); __LOCK(lock); } while (0) +#define __LOCK_IRQSAVE(lock) \ + ({ unsigned long __flags; local_irq_save(__flags); __LOCK(lock); __flags; }) + +#define __TRYLOCK_IRQSAVE(lock, flags) \ + ({ local_irq_save(*(flags)); __LOCK(lock); 1; }) + +#define __spin_trylock_irqsave(lock, flags) __TRYLOCK_IRQSAVE(lock, flags) + +#define __write_trylock_irqsave(lock, flags) __TRYLOCK_IRQSAVE(lock, flags) #define __UNLOCK(lock) \ do { preempt_enable(); __release(lock); (void)(lock); } while (0) +#define __UNLOCK_NO_RESCHED(lock) \ + do { __preempt_enable_no_resched(); __release(lock); (void)(lock); } while (0) + #define __UNLOCK_BH(lock) \ do { preempt_enable_no_resched(); local_bh_enable(); __release(lock); (void)(lock); } while (0) @@ -48,34 +58,36 @@ #define __UNLOCK_IRQRESTORE(lock, flags) \ do { local_irq_restore(flags); __UNLOCK(lock); } while (0) -#define _spin_lock(lock) __LOCK(lock) -#define _spin_lock_nested(lock, subclass) __LOCK(lock) -#define _read_lock(lock) __LOCK(lock) -#define _write_lock(lock) __LOCK(lock) -#define _spin_lock_bh(lock) __LOCK_BH(lock) -#define _read_lock_bh(lock) __LOCK_BH(lock) -#define _write_lock_bh(lock) __LOCK_BH(lock) -#define _spin_lock_irq(lock) __LOCK_IRQ(lock) -#define _read_lock_irq(lock) __LOCK_IRQ(lock) -#define _write_lock_irq(lock) __LOCK_IRQ(lock) -#define _spin_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags) -#define _read_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags) -#define _write_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags) -#define _spin_trylock(lock) ({ __LOCK(lock); 1; }) -#define _read_trylock(lock) ({ __LOCK(lock); 1; }) -#define _write_trylock(lock) ({ __LOCK(lock); 1; }) -#define _spin_trylock_bh(lock) ({ __LOCK_BH(lock); 1; }) -#define _spin_unlock(lock) __UNLOCK(lock) -#define _read_unlock(lock) __UNLOCK(lock) -#define _write_unlock(lock) __UNLOCK(lock) -#define _spin_unlock_bh(lock) __UNLOCK_BH(lock) -#define _write_unlock_bh(lock) __UNLOCK_BH(lock) -#define _read_unlock_bh(lock) __UNLOCK_BH(lock) -#define _spin_unlock_irq(lock) __UNLOCK_IRQ(lock) -#define _read_unlock_irq(lock) __UNLOCK_IRQ(lock) -#define _write_unlock_irq(lock) __UNLOCK_IRQ(lock) -#define _spin_unlock_irqrestore(lock, flags) __UNLOCK_IRQRESTORE(lock, flags) -#define _read_unlock_irqrestore(lock, flags) __UNLOCK_IRQRESTORE(lock, flags) -#define _write_unlock_irqrestore(lock, flags) __UNLOCK_IRQRESTORE(lock, flags) +#define __spin_lock(lock) __LOCK(lock) +#define __spin_lock_nested(lock, subclass) __LOCK(lock) +#define __read_lock(lock) __LOCK(lock) +#define __write_lock(lock) __LOCK(lock) +#define __spin_lock_bh(lock) __LOCK_BH(lock) +#define __read_lock_bh(lock) __LOCK_BH(lock) +#define __write_lock_bh(lock) __LOCK_BH(lock) +#define __spin_lock_irq(lock) __LOCK_IRQ(lock) +#define __read_lock_irq(lock) __LOCK_IRQ(lock) +#define __write_lock_irq(lock) __LOCK_IRQ(lock) +#define __spin_lock_irqsave(lock) __LOCK_IRQSAVE(lock) +#define __read_lock_irqsave(lock) __LOCK_IRQSAVE(lock) +#define __write_lock_irqsave(lock) __LOCK_IRQSAVE(lock) +#define __spin_trylock(lock) ({ __LOCK(lock); 1; }) +#define __read_trylock(lock) ({ __LOCK(lock); 1; }) +#define __write_trylock(lock) ({ __LOCK(lock); 1; }) +#define __spin_trylock_bh(lock) ({ __LOCK_BH(lock); 1; }) +#define __spin_trylock_irq(lock) ({ __LOCK_IRQ(lock); 1; }) +#define __spin_unlock(lock) __UNLOCK(lock) +#define __spin_unlock_no_resched(lock) __UNLOCK_NO_RESCHED(lock) +#define __read_unlock(lock) __UNLOCK(lock) +#define __write_unlock(lock) __UNLOCK(lock) +#define __spin_unlock_bh(lock) __UNLOCK_BH(lock) +#define __write_unlock_bh(lock) __UNLOCK_BH(lock) +#define __read_unlock_bh(lock) __UNLOCK_BH(lock) +#define __spin_unlock_irq(lock) __UNLOCK_IRQ(lock) +#define __read_unlock_irq(lock) __UNLOCK_IRQ(lock) +#define __write_unlock_irq(lock) __UNLOCK_IRQ(lock) +#define __spin_unlock_irqrestore(lock, flags) __UNLOCK_IRQRESTORE(lock, flags) +#define __read_unlock_irqrestore(lock, flags) __UNLOCK_IRQRESTORE(lock, flags) +#define __write_unlock_irqrestore(lock, flags) __UNLOCK_IRQRESTORE(lock, flags) #endif /* __LINUX_SPINLOCK_API_UP_H */ Index: linux-2.6.26/include/linux/spinlock_types.h =================================================================== --- linux-2.6.26.orig/include/linux/spinlock_types.h +++ linux-2.6.26/include/linux/spinlock_types.h @@ -15,10 +15,27 @@ # include #endif +/* + * Must define these before including other files, inline functions need them + */ +#define LOCK_SECTION_NAME ".text.lock."KBUILD_BASENAME + +#define LOCK_SECTION_START(extra) \ + ".subsection 1\n\t" \ + extra \ + ".ifndef " LOCK_SECTION_NAME "\n\t" \ + LOCK_SECTION_NAME ":\n\t" \ + ".endif\n" + +#define LOCK_SECTION_END \ + ".previous\n\t" + +#define __lockfunc __attribute__((section(".spinlock.text"))) + #include typedef struct { - raw_spinlock_t raw_lock; + __raw_spinlock_t raw_lock; #ifdef CONFIG_GENERIC_LOCKBREAK unsigned int break_lock; #endif @@ -29,12 +46,12 @@ typedef struct { #ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map dep_map; #endif -} spinlock_t; +} raw_spinlock_t; #define SPINLOCK_MAGIC 0xdead4ead typedef struct { - raw_rwlock_t raw_lock; + __raw_rwlock_t raw_lock; #ifdef CONFIG_GENERIC_LOCKBREAK unsigned int break_lock; #endif @@ -45,7 +62,7 @@ typedef struct { #ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map dep_map; #endif -} rwlock_t; +} raw_rwlock_t; #define RWLOCK_MAGIC 0xdeaf1eed @@ -64,24 +81,24 @@ typedef struct { #endif #ifdef CONFIG_DEBUG_SPINLOCK -# define __SPIN_LOCK_UNLOCKED(lockname) \ - (spinlock_t) { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \ +# define _RAW_SPIN_LOCK_UNLOCKED(lockname) \ + { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \ .magic = SPINLOCK_MAGIC, \ .owner = SPINLOCK_OWNER_INIT, \ .owner_cpu = -1, \ SPIN_DEP_MAP_INIT(lockname) } -#define __RW_LOCK_UNLOCKED(lockname) \ - (rwlock_t) { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \ +#define _RAW_RW_LOCK_UNLOCKED(lockname) \ + { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \ .magic = RWLOCK_MAGIC, \ .owner = SPINLOCK_OWNER_INIT, \ .owner_cpu = -1, \ RW_DEP_MAP_INIT(lockname) } #else -# define __SPIN_LOCK_UNLOCKED(lockname) \ - (spinlock_t) { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \ +# define _RAW_SPIN_LOCK_UNLOCKED(lockname) \ + { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \ SPIN_DEP_MAP_INIT(lockname) } -#define __RW_LOCK_UNLOCKED(lockname) \ - (rwlock_t) { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \ +# define _RAW_RW_LOCK_UNLOCKED(lockname) \ + { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \ RW_DEP_MAP_INIT(lockname) } #endif @@ -91,10 +108,22 @@ typedef struct { * Please use DEFINE_SPINLOCK()/DEFINE_RWLOCK() or * __SPIN_LOCK_UNLOCKED()/__RW_LOCK_UNLOCKED() as appropriate. */ -#define SPIN_LOCK_UNLOCKED __SPIN_LOCK_UNLOCKED(old_style_spin_init) -#define RW_LOCK_UNLOCKED __RW_LOCK_UNLOCKED(old_style_rw_init) -#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x) -#define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x) +# define RAW_SPIN_LOCK_UNLOCKED(lockname) \ + (raw_spinlock_t) _RAW_SPIN_LOCK_UNLOCKED(lockname) + +# define RAW_RW_LOCK_UNLOCKED(lockname) \ + (raw_rwlock_t) _RAW_RW_LOCK_UNLOCKED(lockname) + +#define DEFINE_RAW_SPINLOCK(name) \ + raw_spinlock_t name __cacheline_aligned_in_smp = \ + RAW_SPIN_LOCK_UNLOCKED(name) + +#define __DEFINE_RAW_SPINLOCK(name) \ + raw_spinlock_t name = RAW_SPIN_LOCK_UNLOCKED(name) + +#define DEFINE_RAW_RWLOCK(name) \ + raw_rwlock_t name __cacheline_aligned_in_smp = \ + RAW_RW_LOCK_UNLOCKED(name) #endif /* __LINUX_SPINLOCK_TYPES_H */ Index: linux-2.6.26/include/linux/spinlock_types_up.h =================================================================== --- linux-2.6.26.orig/include/linux/spinlock_types_up.h +++ linux-2.6.26/include/linux/spinlock_types_up.h @@ -16,13 +16,13 @@ typedef struct { volatile unsigned int slock; -} raw_spinlock_t; +} __raw_spinlock_t; #define __RAW_SPIN_LOCK_UNLOCKED { 1 } #else -typedef struct { } raw_spinlock_t; +typedef struct { } __raw_spinlock_t; #define __RAW_SPIN_LOCK_UNLOCKED { } @@ -30,7 +30,7 @@ typedef struct { } raw_spinlock_t; typedef struct { /* no debug version on UP */ -} raw_rwlock_t; +} __raw_rwlock_t; #define __RAW_RW_LOCK_UNLOCKED { } Index: linux-2.6.26/include/linux/spinlock_up.h =================================================================== --- linux-2.6.26.orig/include/linux/spinlock_up.h +++ linux-2.6.26/include/linux/spinlock_up.h @@ -20,19 +20,19 @@ #ifdef CONFIG_DEBUG_SPINLOCK #define __raw_spin_is_locked(x) ((x)->slock == 0) -static inline void __raw_spin_lock(raw_spinlock_t *lock) +static inline void __raw_spin_lock(__raw_spinlock_t *lock) { lock->slock = 0; } static inline void -__raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags) +__raw_spin_lock_flags(__raw_spinlock_t *lock, unsigned long flags) { local_irq_save(flags); lock->slock = 0; } -static inline int __raw_spin_trylock(raw_spinlock_t *lock) +static inline int __raw_spin_trylock(__raw_spinlock_t *lock) { char oldval = lock->slock; @@ -41,7 +41,7 @@ static inline int __raw_spin_trylock(raw return oldval > 0; } -static inline void __raw_spin_unlock(raw_spinlock_t *lock) +static inline void __raw_spin_unlock(__raw_spinlock_t *lock) { lock->slock = 1; } Index: linux-2.6.26/kernel/Makefile =================================================================== --- linux-2.6.26.orig/kernel/Makefile +++ linux-2.6.26/kernel/Makefile @@ -7,7 +7,7 @@ obj-y = sched.o fork.o exec_domain.o sysctl.o capability.o ptrace.o timer.o user.o \ signal.o sys.o kmod.o workqueue.o pid.o \ rcupdate.o extable.o params.o posix-timers.o \ - kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \ + kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o \ hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \ notifier.o ksysfs.o pm_qos_params.o sched_clock.o @@ -26,7 +26,10 @@ endif obj-$(CONFIG_SYSCTL_SYSCALL_CHECK) += sysctl_check.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-y += time/ +ifneq ($(CONFIG_PREEMPT_RT),y) +obj-y += mutex.o obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o +endif obj-$(CONFIG_LOCKDEP) += lockdep.o ifeq ($(CONFIG_PROC_FS),y) obj-$(CONFIG_LOCKDEP) += lockdep_proc.o @@ -38,6 +41,7 @@ endif obj-$(CONFIG_RT_MUTEXES) += rtmutex.o obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o +obj-$(CONFIG_PREEMPT_RT) += rt.o obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o obj-$(CONFIG_SMP) += cpu.o spinlock.o obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o Index: linux-2.6.26/kernel/fork.c =================================================================== --- linux-2.6.26.orig/kernel/fork.c +++ linux-2.6.26/kernel/fork.c @@ -851,6 +851,9 @@ static void rt_mutex_init_task(struct ta #ifdef CONFIG_RT_MUTEXES plist_head_init(&p->pi_waiters, &p->pi_lock); p->pi_blocked_on = NULL; +# ifdef CONFIG_DEBUG_RT_MUTEXES + p->last_kernel_lock = NULL; +# endif #endif } @@ -1067,6 +1070,9 @@ static struct task_struct *copy_process( retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs); if (retval) goto bad_fork_cleanup_io; +#ifdef CONFIG_DEBUG_PREEMPT + p->lock_count = 0; +#endif if (pid != &init_struct_pid) { retval = -ENOMEM; Index: linux-2.6.26/kernel/futex.c =================================================================== --- linux-2.6.26.orig/kernel/futex.c +++ linux-2.6.26/kernel/futex.c @@ -2088,7 +2088,11 @@ static int __init futex_init(void) futex_cmpxchg_enabled = 1; for (i = 0; i < ARRAY_SIZE(futex_queues); i++) { +#ifdef CONFIG_PREEMPT_RT + plist_head_init(&futex_queues[i].chain, NULL); +#else plist_head_init(&futex_queues[i].chain, &futex_queues[i].lock); +#endif spin_lock_init(&futex_queues[i].lock); } Index: linux-2.6.26/kernel/lockdep.c =================================================================== --- linux-2.6.26.orig/kernel/lockdep.c +++ linux-2.6.26/kernel/lockdep.c @@ -67,7 +67,7 @@ module_param(lock_stat, int, 0644); * to use a raw spinlock - we really dont want the spinlock * code to recurse back into the lockdep code... */ -static raw_spinlock_t lockdep_lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; +static __raw_spinlock_t lockdep_lock = (__raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; static int graph_lock(void) { Index: linux-2.6.26/kernel/rt.c =================================================================== --- /dev/null +++ linux-2.6.26/kernel/rt.c @@ -0,0 +1,634 @@ +/* + * kernel/rt.c + * + * Real-Time Preemption Support + * + * started by Ingo Molnar: + * + * Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar + * Copyright (C) 2006, Timesys Corp., Thomas Gleixner + * + * historic credit for proving that Linux spinlocks can be implemented via + * RT-aware mutexes goes to many people: The Pmutex project (Dirk Grambow + * and others) who prototyped it on 2.4 and did lots of comparative + * research and analysis; TimeSys, for proving that you can implement a + * fully preemptible kernel via the use of IRQ threading and mutexes; + * Bill Huey for persuasively arguing on lkml that the mutex model is the + * right one; and to MontaVista, who ported pmutexes to 2.6. + * + * This code is a from-scratch implementation and is not based on pmutexes, + * but the idea of converting spinlocks to mutexes is used here too. + * + * lock debugging, locking tree, deadlock detection: + * + * Copyright (C) 2004, LynuxWorks, Inc., Igor Manyilov, Bill Huey + * Released under the General Public License (GPL). + * + * Includes portions of the generic R/W semaphore implementation from: + * + * Copyright (c) 2001 David Howells (dhowells@redhat.com). + * - Derived partially from idea by Andrea Arcangeli + * - Derived also from comments by Linus + * + * Pending ownership of locks and ownership stealing: + * + * Copyright (C) 2005, Kihon Technologies Inc., Steven Rostedt + * + * (also by Steven Rostedt) + * - Converted single pi_lock to individual task locks. + * + * By Esben Nielsen: + * Doing priority inheritance with help of the scheduler. + * + * Copyright (C) 2006, Timesys Corp., Thomas Gleixner + * - major rework based on Esben Nielsens initial patch + * - replaced thread_info references by task_struct refs + * - removed task->pending_owner dependency + * - BKL drop/reacquire for semaphore style locks to avoid deadlocks + * in the scheduler return path as discussed with Steven Rostedt + * + * Copyright (C) 2006, Kihon Technologies Inc. + * Steven Rostedt + * - debugged and patched Thomas Gleixner's rework. + * - added back the cmpxchg to the rework. + * - turned atomic require back on for SMP. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "rtmutex_common.h" + +#ifdef CONFIG_PREEMPT_RT +/* + * Unlock these on crash: + */ +void zap_rt_locks(void) +{ + //trace_lock_init(); +} +#endif + +/* + * struct mutex functions + */ +void _mutex_init(struct mutex *lock, char *name, struct lock_class_key *key) +{ +#ifdef CONFIG_DEBUG_LOCK_ALLOC + /* + * Make sure we are not reinitializing a held lock: + */ + debug_check_no_locks_freed((void *)lock, sizeof(*lock)); + lockdep_init_map(&lock->dep_map, name, key, 0); +#endif + __rt_mutex_init(&lock->lock, name); +} +EXPORT_SYMBOL(_mutex_init); + +void __lockfunc _mutex_lock(struct mutex *lock) +{ + mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); + rt_mutex_lock(&lock->lock); +} +EXPORT_SYMBOL(_mutex_lock); + +int __lockfunc _mutex_lock_interruptible(struct mutex *lock) +{ + int ret; + + mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); + ret = rt_mutex_lock_interruptible(&lock->lock, 0); + if (ret) + mutex_release(&lock->dep_map, 1, _RET_IP_); + return ret; +} +EXPORT_SYMBOL(_mutex_lock_interruptible); + +int __lockfunc _mutex_lock_killable(struct mutex *lock) +{ + int ret; + + mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); + ret = rt_mutex_lock_killable(&lock->lock, 0); + if (ret) + mutex_release(&lock->dep_map, 1, _RET_IP_); + return ret; +} +EXPORT_SYMBOL(_mutex_lock_killable); + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +void __lockfunc _mutex_lock_nested(struct mutex *lock, int subclass) +{ + mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_); + rt_mutex_lock(&lock->lock); +} +EXPORT_SYMBOL(_mutex_lock_nested); + +int __lockfunc _mutex_lock_interruptible_nested(struct mutex *lock, int subclass) +{ + int ret; + + mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_); + ret = rt_mutex_lock_interruptible(&lock->lock, 0); + if (ret) + mutex_release(&lock->dep_map, 1, _RET_IP_); + return ret; +} +EXPORT_SYMBOL(_mutex_lock_interruptible_nested); + +int __lockfunc _mutex_lock_killable_nested(struct mutex *lock, int subclass) +{ + int ret; + + mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_); + ret = rt_mutex_lock_killable(&lock->lock, 0); + if (ret) + mutex_release(&lock->dep_map, 1, _RET_IP_); + return ret; +} +EXPORT_SYMBOL(_mutex_lock_killable_nested); +#endif + +int __lockfunc _mutex_trylock(struct mutex *lock) +{ + int ret = rt_mutex_trylock(&lock->lock); + + if (ret) + mutex_acquire(&lock->dep_map, 0, 1, _RET_IP_); + + return ret; +} +EXPORT_SYMBOL(_mutex_trylock); + +void __lockfunc _mutex_unlock(struct mutex *lock) +{ + mutex_release(&lock->dep_map, 1, _RET_IP_); + rt_mutex_unlock(&lock->lock); +} +EXPORT_SYMBOL(_mutex_unlock); + +/* + * rwlock_t functions + */ +int __lockfunc rt_write_trylock(rwlock_t *rwlock) +{ + int ret = rt_mutex_trylock(&rwlock->lock); + + if (ret) + rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_); + + return ret; +} +EXPORT_SYMBOL(rt_write_trylock); + +int __lockfunc rt_write_trylock_irqsave(rwlock_t *rwlock, unsigned long *flags) +{ + *flags = 0; + return rt_write_trylock(rwlock); +} +EXPORT_SYMBOL(rt_write_trylock_irqsave); + +int __lockfunc rt_read_trylock(rwlock_t *rwlock) +{ + struct rt_mutex *lock = &rwlock->lock; + unsigned long flags; + int ret; + + /* + * Read locks within the self-held write lock succeed. + */ + spin_lock_irqsave(&lock->wait_lock, flags); + if (rt_mutex_real_owner(lock) == current) { + spin_unlock_irqrestore(&lock->wait_lock, flags); + rwlock->read_depth++; + rwlock_acquire_read(&rwlock->dep_map, 0, 1, _RET_IP_); + return 1; + } + spin_unlock_irqrestore(&lock->wait_lock, flags); + + ret = rt_mutex_trylock(lock); + if (ret) + rwlock_acquire_read(&rwlock->dep_map, 0, 1, _RET_IP_); + + return ret; +} +EXPORT_SYMBOL(rt_read_trylock); + +void __lockfunc rt_write_lock(rwlock_t *rwlock) +{ + rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_); + __rt_spin_lock(&rwlock->lock); +} +EXPORT_SYMBOL(rt_write_lock); + +void __lockfunc rt_read_lock(rwlock_t *rwlock) +{ + unsigned long flags; + struct rt_mutex *lock = &rwlock->lock; + + rwlock_acquire_read(&rwlock->dep_map, 0, 0, _RET_IP_); + /* + * Read locks within the write lock succeed. + */ + spin_lock_irqsave(&lock->wait_lock, flags); + if (rt_mutex_real_owner(lock) == current) { + spin_unlock_irqrestore(&lock->wait_lock, flags); + rwlock->read_depth++; + return; + } + spin_unlock_irqrestore(&lock->wait_lock, flags); + __rt_spin_lock(lock); +} + +EXPORT_SYMBOL(rt_read_lock); + +void __lockfunc rt_write_unlock(rwlock_t *rwlock) +{ + /* NOTE: we always pass in '1' for nested, for simplicity */ + rwlock_release(&rwlock->dep_map, 1, _RET_IP_); + __rt_spin_unlock(&rwlock->lock); +} +EXPORT_SYMBOL(rt_write_unlock); + +void __lockfunc rt_read_unlock(rwlock_t *rwlock) +{ + struct rt_mutex *lock = &rwlock->lock; + unsigned long flags; + + rwlock_release(&rwlock->dep_map, 1, _RET_IP_); + // TRACE_WARN_ON(lock->save_state != 1); + /* + * Read locks within the self-held write lock succeed. + */ + spin_lock_irqsave(&lock->wait_lock, flags); + if (rt_mutex_real_owner(lock) == current && rwlock->read_depth) { + spin_unlock_irqrestore(&lock->wait_lock, flags); + rwlock->read_depth--; + return; + } + spin_unlock_irqrestore(&lock->wait_lock, flags); + __rt_spin_unlock(&rwlock->lock); +} +EXPORT_SYMBOL(rt_read_unlock); + +unsigned long __lockfunc rt_write_lock_irqsave(rwlock_t *rwlock) +{ + rt_write_lock(rwlock); + + return 0; +} +EXPORT_SYMBOL(rt_write_lock_irqsave); + +unsigned long __lockfunc rt_read_lock_irqsave(rwlock_t *rwlock) +{ + rt_read_lock(rwlock); + + return 0; +} +EXPORT_SYMBOL(rt_read_lock_irqsave); + +void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key) +{ +#ifdef CONFIG_DEBUG_LOCK_ALLOC + /* + * Make sure we are not reinitializing a held lock: + */ + debug_check_no_locks_freed((void *)rwlock, sizeof(*rwlock)); + lockdep_init_map(&rwlock->dep_map, name, key, 0); +#endif + __rt_mutex_init(&rwlock->lock, name); + rwlock->read_depth = 0; +} +EXPORT_SYMBOL(__rt_rwlock_init); + +/* + * rw_semaphores + */ + +void rt_up_write(struct rw_semaphore *rwsem) +{ + rwsem_release(&rwsem->dep_map, 1, _RET_IP_); + rt_mutex_unlock(&rwsem->lock); +} +EXPORT_SYMBOL(rt_up_write); + +void rt_up_read(struct rw_semaphore *rwsem) +{ + unsigned long flags; + + rwsem_release(&rwsem->dep_map, 1, _RET_IP_); + /* + * Read locks within the self-held write lock succeed. + */ + spin_lock_irqsave(&rwsem->lock.wait_lock, flags); + if (rt_mutex_real_owner(&rwsem->lock) == current && rwsem->read_depth) { + spin_unlock_irqrestore(&rwsem->lock.wait_lock, flags); + rwsem->read_depth--; + return; + } + spin_unlock_irqrestore(&rwsem->lock.wait_lock, flags); + rt_mutex_unlock(&rwsem->lock); +} +EXPORT_SYMBOL(rt_up_read); + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +void rt_up_read_non_owner(struct rw_semaphore *rwsem) +{ + unsigned long flags; + /* + * Read locks within the self-held write lock succeed. + */ + spin_lock_irqsave(&rwsem->lock.wait_lock, flags); + if (rt_mutex_real_owner(&rwsem->lock) == current && rwsem->read_depth) { + spin_unlock_irqrestore(&rwsem->lock.wait_lock, flags); + rwsem->read_depth--; + return; + } + spin_unlock_irqrestore(&rwsem->lock.wait_lock, flags); + rt_mutex_unlock(&rwsem->lock); +} +EXPORT_SYMBOL(rt_up_read_non_owner); +#endif + +/* + * downgrade a write lock into a read lock + * - just wake up any readers at the front of the queue + */ +void rt_downgrade_write(struct rw_semaphore *rwsem) +{ + BUG(); +} +EXPORT_SYMBOL(rt_downgrade_write); + +int rt_down_write_trylock(struct rw_semaphore *rwsem) +{ + int ret = rt_mutex_trylock(&rwsem->lock); + + if (ret) + rwsem_acquire(&rwsem->dep_map, 0, 1, _RET_IP_); + return ret; +} +EXPORT_SYMBOL(rt_down_write_trylock); + +void rt_down_write(struct rw_semaphore *rwsem) +{ + rwsem_acquire(&rwsem->dep_map, 0, 0, _RET_IP_); + rt_mutex_lock(&rwsem->lock); +} +EXPORT_SYMBOL(rt_down_write); + +void rt_down_write_nested(struct rw_semaphore *rwsem, int subclass) +{ + rwsem_acquire(&rwsem->dep_map, subclass, 0, _RET_IP_); + rt_mutex_lock(&rwsem->lock); +} +EXPORT_SYMBOL(rt_down_write_nested); + +int rt_down_read_trylock(struct rw_semaphore *rwsem) +{ + unsigned long flags; + int ret; + + /* + * Read locks within the self-held write lock succeed. + */ + spin_lock_irqsave(&rwsem->lock.wait_lock, flags); + if (rt_mutex_real_owner(&rwsem->lock) == current) { + spin_unlock_irqrestore(&rwsem->lock.wait_lock, flags); + rwsem_acquire_read(&rwsem->dep_map, 0, 1, _RET_IP_); + rwsem->read_depth++; + return 1; + } + spin_unlock_irqrestore(&rwsem->lock.wait_lock, flags); + + ret = rt_mutex_trylock(&rwsem->lock); + if (ret) + rwsem_acquire(&rwsem->dep_map, 0, 1, _RET_IP_); + return ret; +} +EXPORT_SYMBOL(rt_down_read_trylock); + +static void __rt_down_read(struct rw_semaphore *rwsem, int subclass) +{ + unsigned long flags; + + rwsem_acquire_read(&rwsem->dep_map, subclass, 0, _RET_IP_); + + /* + * Read locks within the write lock succeed. + */ + spin_lock_irqsave(&rwsem->lock.wait_lock, flags); + + if (rt_mutex_real_owner(&rwsem->lock) == current) { + spin_unlock_irqrestore(&rwsem->lock.wait_lock, flags); + rwsem->read_depth++; + return; + } + spin_unlock_irqrestore(&rwsem->lock.wait_lock, flags); + rt_mutex_lock(&rwsem->lock); +} + +void rt_down_read(struct rw_semaphore *rwsem) +{ + __rt_down_read(rwsem, 0); +} +EXPORT_SYMBOL(rt_down_read); + +void rt_down_read_nested(struct rw_semaphore *rwsem, int subclass) +{ + __rt_down_read(rwsem, subclass); +} +EXPORT_SYMBOL(rt_down_read_nested); + + +#ifdef CONFIG_DEBUG_LOCK_ALLOC + +/* + * Same as rt_down_read() but no lockdep calls: + */ +void rt_down_read_non_owner(struct rw_semaphore *rwsem) +{ + unsigned long flags; + /* + * Read locks within the write lock succeed. + */ + spin_lock_irqsave(&rwsem->lock.wait_lock, flags); + + if (rt_mutex_real_owner(&rwsem->lock) == current) { + spin_unlock_irqrestore(&rwsem->lock.wait_lock, flags); + rwsem->read_depth++; + return; + } + spin_unlock_irqrestore(&rwsem->lock.wait_lock, flags); + rt_mutex_lock(&rwsem->lock); +} +EXPORT_SYMBOL(rt_down_read_non_owner); + +#endif + +void __rt_rwsem_init(struct rw_semaphore *rwsem, char *name, + struct lock_class_key *key) +{ +#ifdef CONFIG_DEBUG_LOCK_ALLOC + /* + * Make sure we are not reinitializing a held lock: + */ + debug_check_no_locks_freed((void *)rwsem, sizeof(*rwsem)); + lockdep_init_map(&rwsem->dep_map, name, key, 0); +#endif + __rt_mutex_init(&rwsem->lock, name); + rwsem->read_depth = 0; +} +EXPORT_SYMBOL(__rt_rwsem_init); + +/* + * Semaphores + */ +/* + * Linux Semaphores implemented via RT-mutexes. + * + * In the down() variants we use the mutex as the semaphore blocking + * object: we always acquire it, decrease the counter and keep the lock + * locked if we did the 1->0 transition. The next down() will then block. + * + * In the up() path we atomically increase the counter and do the + * unlock if we were the one doing the 0->1 transition. + */ + +static inline void __down_complete(struct semaphore *sem) +{ + int count = atomic_dec_return(&sem->count); + + if (unlikely(count > 0)) + rt_mutex_unlock(&sem->lock); +} + +void rt_down(struct semaphore *sem) +{ + rt_mutex_lock(&sem->lock); + __down_complete(sem); +} +EXPORT_SYMBOL(rt_down); + +int rt_down_interruptible(struct semaphore *sem) +{ + int ret; + + ret = rt_mutex_lock_interruptible(&sem->lock, 0); + if (ret) + return ret; + __down_complete(sem); + return 0; +} +EXPORT_SYMBOL(rt_down_interruptible); + +int rt_down_timeout(struct semaphore *sem, long jiff) +{ + struct hrtimer_sleeper t; + struct timespec ts; + unsigned long expires = jiffies + jiff + 1; + int ret; + + /* + * rt_mutex_slowlock can use an interruptible, but this needs to + * be TASK_INTERRUPTIBLE. The down_timeout uses TASK_UNINTERRUPTIBLE. + * To handle this we loop if a signal caused the timeout and the + * we recalculate the new timeout. + * Yes Thomas, this is a hack! But we can fix it right later. + */ + do { + jiffies_to_timespec(jiff, &ts); + hrtimer_init_on_stack(&t.timer, HRTIMER_MODE_REL, CLOCK_MONOTONIC); + t.timer.expires = timespec_to_ktime(ts); + + ret = rt_mutex_timed_lock(&sem->lock, &t, 0); + if (ret != -EINTR) + break; + + /* signal occured, but the down_timeout doesn't handle them */ + jiff = expires - jiffies; + + } while (jiff > 0); + + if (!ret) + __down_complete(sem); + else + ret = -ETIME; + + return ret; +} +EXPORT_SYMBOL(rt_down_timeout); + +/* + * try to down the semaphore, 0 on success and 1 on failure. (inverted) + */ +int rt_down_trylock(struct semaphore *sem) +{ + /* + * Here we are a tiny bit different from ordinary Linux semaphores, + * because we can get 'transient' locking-failures when say a + * process decreases the count from 9 to 8 and locks/releases the + * embedded mutex internally. It would be quite complex to remove + * these transient failures so lets try it the simple way first: + */ + if (rt_mutex_trylock(&sem->lock)) { + __down_complete(sem); + return 0; + } + return 1; +} +EXPORT_SYMBOL(rt_down_trylock); + +void rt_up(struct semaphore *sem) +{ + int count; + + /* + * Disable preemption to make sure a highprio trylock-er cannot + * preempt us here and get into an infinite loop: + */ + preempt_disable(); + count = atomic_inc_return(&sem->count); + /* + * If we did the 0 -> 1 transition then we are the ones to unlock it: + */ + if (likely(count == 1)) + rt_mutex_unlock(&sem->lock); + preempt_enable(); +} +EXPORT_SYMBOL(rt_up); + +void __sema_init(struct semaphore *sem, int val, + char *name, char *file, int line) +{ + atomic_set(&sem->count, val); + switch (val) { + case 0: + __rt_mutex_init(&sem->lock, name); + rt_mutex_lock(&sem->lock); + break; + default: + __rt_mutex_init(&sem->lock, name); + break; + } +} +EXPORT_SYMBOL(__sema_init); + +void __init_MUTEX(struct semaphore *sem, char *name, char *file, + int line) +{ + __sema_init(sem, 1, name, file, line); +} +EXPORT_SYMBOL(__init_MUTEX); + Index: linux-2.6.26/kernel/rtmutex-debug.c =================================================================== --- linux-2.6.26.orig/kernel/rtmutex-debug.c +++ linux-2.6.26/kernel/rtmutex-debug.c @@ -16,6 +16,7 @@ * * See rt.c in preempt-rt for proper credits and further information */ +#include #include #include #include @@ -29,61 +30,6 @@ #include "rtmutex_common.h" -# define TRACE_WARN_ON(x) WARN_ON(x) -# define TRACE_BUG_ON(x) BUG_ON(x) - -# define TRACE_OFF() \ -do { \ - if (rt_trace_on) { \ - rt_trace_on = 0; \ - console_verbose(); \ - if (spin_is_locked(¤t->pi_lock)) \ - spin_unlock(¤t->pi_lock); \ - } \ -} while (0) - -# define TRACE_OFF_NOLOCK() \ -do { \ - if (rt_trace_on) { \ - rt_trace_on = 0; \ - console_verbose(); \ - } \ -} while (0) - -# define TRACE_BUG_LOCKED() \ -do { \ - TRACE_OFF(); \ - BUG(); \ -} while (0) - -# define TRACE_WARN_ON_LOCKED(c) \ -do { \ - if (unlikely(c)) { \ - TRACE_OFF(); \ - WARN_ON(1); \ - } \ -} while (0) - -# define TRACE_BUG_ON_LOCKED(c) \ -do { \ - if (unlikely(c)) \ - TRACE_BUG_LOCKED(); \ -} while (0) - -#ifdef CONFIG_SMP -# define SMP_TRACE_BUG_ON_LOCKED(c) TRACE_BUG_ON_LOCKED(c) -#else -# define SMP_TRACE_BUG_ON_LOCKED(c) do { } while (0) -#endif - -/* - * deadlock detection flag. We turn it off when we detect - * the first problem because we dont want to recurse back - * into the tracing code when doing error printk or - * executing a BUG(): - */ -static int rt_trace_on = 1; - static void printk_task(struct task_struct *p) { if (p) @@ -111,8 +57,8 @@ static void printk_lock(struct rt_mutex void rt_mutex_debug_task_free(struct task_struct *task) { - WARN_ON(!plist_head_empty(&task->pi_waiters)); - WARN_ON(task->pi_blocked_on); + DEBUG_LOCKS_WARN_ON(!plist_head_empty(&task->pi_waiters)); + DEBUG_LOCKS_WARN_ON(task->pi_blocked_on); } /* @@ -125,7 +71,7 @@ void debug_rt_mutex_deadlock(int detect, { struct task_struct *task; - if (!rt_trace_on || detect || !act_waiter) + if (!debug_locks || detect || !act_waiter) return; task = rt_mutex_owner(act_waiter->lock); @@ -139,7 +85,7 @@ void debug_rt_mutex_print_deadlock(struc { struct task_struct *task; - if (!waiter->deadlock_lock || !rt_trace_on) + if (!waiter->deadlock_lock || !debug_locks) return; rcu_read_lock(); @@ -149,7 +95,8 @@ void debug_rt_mutex_print_deadlock(struc return; } - TRACE_OFF_NOLOCK(); + if (!debug_locks_off()) + return; printk("\n============================================\n"); printk( "[ BUG: circular locking deadlock detected! ]\n"); @@ -180,7 +127,6 @@ void debug_rt_mutex_print_deadlock(struc printk("[ turning off deadlock detection." "Please report this trace. ]\n\n"); - local_irq_disable(); } void debug_rt_mutex_lock(struct rt_mutex *lock) @@ -189,7 +135,8 @@ void debug_rt_mutex_lock(struct rt_mutex void debug_rt_mutex_unlock(struct rt_mutex *lock) { - TRACE_WARN_ON_LOCKED(rt_mutex_owner(lock) != current); + if (debug_locks) + DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current); } void @@ -199,7 +146,7 @@ debug_rt_mutex_proxy_lock(struct rt_mute void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock) { - TRACE_WARN_ON_LOCKED(!rt_mutex_owner(lock)); + DEBUG_LOCKS_WARN_ON(!rt_mutex_owner(lock)); } void debug_rt_mutex_init_waiter(struct rt_mutex_waiter *waiter) @@ -213,9 +160,9 @@ void debug_rt_mutex_init_waiter(struct r void debug_rt_mutex_free_waiter(struct rt_mutex_waiter *waiter) { put_pid(waiter->deadlock_task_pid); - TRACE_WARN_ON(!plist_node_empty(&waiter->list_entry)); - TRACE_WARN_ON(!plist_node_empty(&waiter->pi_list_entry)); - TRACE_WARN_ON(waiter->task); + DEBUG_LOCKS_WARN_ON(!plist_node_empty(&waiter->list_entry)); + DEBUG_LOCKS_WARN_ON(!plist_node_empty(&waiter->pi_list_entry)); + DEBUG_LOCKS_WARN_ON(waiter->task); memset(waiter, 0x22, sizeof(*waiter)); } @@ -231,9 +178,36 @@ void debug_rt_mutex_init(struct rt_mutex void rt_mutex_deadlock_account_lock(struct rt_mutex *lock, struct task_struct *task) { +#ifdef CONFIG_DEBUG_PREEMPT + if (task->lock_count >= MAX_LOCK_STACK) { + if (!debug_locks_off()) + return; + printk("BUG: %s/%d: lock count overflow!\n", + task->comm, task->pid); + dump_stack(); + return; + } +#ifdef CONFIG_PREEMPT_RT + task->owned_lock[task->lock_count] = lock; +#endif + task->lock_count++; +#endif } void rt_mutex_deadlock_account_unlock(struct task_struct *task) { +#ifdef CONFIG_DEBUG_PREEMPT + if (!task->lock_count) { + if (!debug_locks_off()) + return; + printk("BUG: %s/%d: lock count underflow!\n", + task->comm, task->pid); + dump_stack(); + return; + } + task->lock_count--; +#ifdef CONFIG_PREEMPT_RT + task->owned_lock[task->lock_count] = NULL; +#endif +#endif } - Index: linux-2.6.26/kernel/rtmutex.c =================================================================== --- linux-2.6.26.orig/kernel/rtmutex.c +++ linux-2.6.26/kernel/rtmutex.c @@ -14,6 +14,7 @@ #include #include #include +#include #include "rtmutex_common.h" @@ -97,6 +98,22 @@ static inline void mark_rt_mutex_waiters } #endif +int pi_initialized; + +/* + * we initialize the wait_list runtime. (Could be done build-time and/or + * boot-time.) + */ +static inline void init_lists(struct rt_mutex *lock) +{ + if (unlikely(!lock->wait_list.prio_list.prev)) { + plist_head_init(&lock->wait_list, &lock->wait_lock); +#ifdef CONFIG_DEBUG_RT_MUTEXES + pi_initialized++; +#endif + } +} + /* * Calculate task priority from the waiter list priority * @@ -254,13 +271,13 @@ static int rt_mutex_adjust_prio_chain(st plist_add(&waiter->list_entry, &lock->wait_list); /* Release the task */ - spin_unlock_irqrestore(&task->pi_lock, flags); + spin_unlock(&task->pi_lock); put_task_struct(task); /* Grab the next task */ task = rt_mutex_owner(lock); get_task_struct(task); - spin_lock_irqsave(&task->pi_lock, flags); + spin_lock(&task->pi_lock); if (waiter == rt_mutex_top_waiter(lock)) { /* Boost the owner */ @@ -278,10 +295,10 @@ static int rt_mutex_adjust_prio_chain(st __rt_mutex_adjust_prio(task); } - spin_unlock_irqrestore(&task->pi_lock, flags); + spin_unlock(&task->pi_lock); top_waiter = rt_mutex_top_waiter(lock); - spin_unlock(&lock->wait_lock); + spin_unlock_irqrestore(&lock->wait_lock, flags); if (!detect_deadlock && waiter != top_waiter) goto out_put_task; @@ -305,7 +322,6 @@ static inline int try_to_steal_lock(stru { struct task_struct *pendowner = rt_mutex_owner(lock); struct rt_mutex_waiter *next; - unsigned long flags; if (!rt_mutex_owner_pending(lock)) return 0; @@ -313,9 +329,9 @@ static inline int try_to_steal_lock(stru if (pendowner == current) return 1; - spin_lock_irqsave(&pendowner->pi_lock, flags); + spin_lock(&pendowner->pi_lock); if (current->prio >= pendowner->prio) { - spin_unlock_irqrestore(&pendowner->pi_lock, flags); + spin_unlock(&pendowner->pi_lock); return 0; } @@ -325,7 +341,7 @@ static inline int try_to_steal_lock(stru * priority. */ if (likely(!rt_mutex_has_waiters(lock))) { - spin_unlock_irqrestore(&pendowner->pi_lock, flags); + spin_unlock(&pendowner->pi_lock); return 1; } @@ -333,7 +349,7 @@ static inline int try_to_steal_lock(stru next = rt_mutex_top_waiter(lock); plist_del(&next->pi_list_entry, &pendowner->pi_waiters); __rt_mutex_adjust_prio(pendowner); - spin_unlock_irqrestore(&pendowner->pi_lock, flags); + spin_unlock(&pendowner->pi_lock); /* * We are going to steal the lock and a waiter was @@ -350,10 +366,10 @@ static inline int try_to_steal_lock(stru * might be current: */ if (likely(next->task != current)) { - spin_lock_irqsave(¤t->pi_lock, flags); + spin_lock(¤t->pi_lock); plist_add(&next->pi_list_entry, ¤t->pi_waiters); __rt_mutex_adjust_prio(current); - spin_unlock_irqrestore(¤t->pi_lock, flags); + spin_unlock(¤t->pi_lock); } return 1; } @@ -412,14 +428,13 @@ static int try_to_take_rt_mutex(struct r */ static int task_blocks_on_rt_mutex(struct rt_mutex *lock, struct rt_mutex_waiter *waiter, - int detect_deadlock) + int detect_deadlock, unsigned long flags) { struct task_struct *owner = rt_mutex_owner(lock); struct rt_mutex_waiter *top_waiter = waiter; - unsigned long flags; int chain_walk = 0, res; - spin_lock_irqsave(¤t->pi_lock, flags); + spin_lock(¤t->pi_lock); __rt_mutex_adjust_prio(current); waiter->task = current; waiter->lock = lock; @@ -433,17 +448,17 @@ static int task_blocks_on_rt_mutex(struc current->pi_blocked_on = waiter; - spin_unlock_irqrestore(¤t->pi_lock, flags); + spin_unlock(¤t->pi_lock); if (waiter == rt_mutex_top_waiter(lock)) { - spin_lock_irqsave(&owner->pi_lock, flags); + spin_lock(&owner->pi_lock); plist_del(&top_waiter->pi_list_entry, &owner->pi_waiters); plist_add(&waiter->pi_list_entry, &owner->pi_waiters); __rt_mutex_adjust_prio(owner); if (owner->pi_blocked_on) chain_walk = 1; - spin_unlock_irqrestore(&owner->pi_lock, flags); + spin_unlock(&owner->pi_lock); } else if (debug_rt_mutex_detect_deadlock(waiter, detect_deadlock)) chain_walk = 1; @@ -458,12 +473,12 @@ static int task_blocks_on_rt_mutex(struc */ get_task_struct(owner); - spin_unlock(&lock->wait_lock); + spin_unlock_irqrestore(&lock->wait_lock, flags); res = rt_mutex_adjust_prio_chain(owner, detect_deadlock, lock, waiter, current); - spin_lock(&lock->wait_lock); + spin_lock_irq(&lock->wait_lock); return res; } @@ -476,13 +491,12 @@ static int task_blocks_on_rt_mutex(struc * * Called with lock->wait_lock held. */ -static void wakeup_next_waiter(struct rt_mutex *lock) +static void wakeup_next_waiter(struct rt_mutex *lock, int savestate) { struct rt_mutex_waiter *waiter; struct task_struct *pendowner; - unsigned long flags; - spin_lock_irqsave(¤t->pi_lock, flags); + spin_lock(¤t->pi_lock); waiter = rt_mutex_top_waiter(lock); plist_del(&waiter->list_entry, &lock->wait_list); @@ -499,7 +513,7 @@ static void wakeup_next_waiter(struct rt rt_mutex_set_owner(lock, pendowner, RT_MUTEX_OWNER_PENDING); - spin_unlock_irqrestore(¤t->pi_lock, flags); + spin_unlock(¤t->pi_lock); /* * Clear the pi_blocked_on variable and enqueue a possible @@ -508,7 +522,7 @@ static void wakeup_next_waiter(struct rt * waiter with higher priority than pending-owner->normal_prio * is blocked on the unboosted (pending) owner. */ - spin_lock_irqsave(&pendowner->pi_lock, flags); + spin_lock(&pendowner->pi_lock); WARN_ON(!pendowner->pi_blocked_on); WARN_ON(pendowner->pi_blocked_on != waiter); @@ -522,9 +536,12 @@ static void wakeup_next_waiter(struct rt next = rt_mutex_top_waiter(lock); plist_add(&next->pi_list_entry, &pendowner->pi_waiters); } - spin_unlock_irqrestore(&pendowner->pi_lock, flags); + spin_unlock(&pendowner->pi_lock); - wake_up_process(pendowner); + if (savestate) + wake_up_process_mutex(pendowner); + else + wake_up_process(pendowner); } /* @@ -533,22 +550,22 @@ static void wakeup_next_waiter(struct rt * Must be called with lock->wait_lock held */ static void remove_waiter(struct rt_mutex *lock, - struct rt_mutex_waiter *waiter) + struct rt_mutex_waiter *waiter, + unsigned long flags) { int first = (waiter == rt_mutex_top_waiter(lock)); struct task_struct *owner = rt_mutex_owner(lock); - unsigned long flags; int chain_walk = 0; - spin_lock_irqsave(¤t->pi_lock, flags); + spin_lock(¤t->pi_lock); plist_del(&waiter->list_entry, &lock->wait_list); waiter->task = NULL; current->pi_blocked_on = NULL; - spin_unlock_irqrestore(¤t->pi_lock, flags); + spin_unlock(¤t->pi_lock); if (first && owner != current) { - spin_lock_irqsave(&owner->pi_lock, flags); + spin_lock(&owner->pi_lock); plist_del(&waiter->pi_list_entry, &owner->pi_waiters); @@ -563,7 +580,7 @@ static void remove_waiter(struct rt_mute if (owner->pi_blocked_on) chain_walk = 1; - spin_unlock_irqrestore(&owner->pi_lock, flags); + spin_unlock(&owner->pi_lock); } WARN_ON(!plist_node_empty(&waiter->pi_list_entry)); @@ -574,11 +591,11 @@ static void remove_waiter(struct rt_mute /* gets dropped in rt_mutex_adjust_prio_chain()! */ get_task_struct(owner); - spin_unlock(&lock->wait_lock); + spin_unlock_irqrestore(&lock->wait_lock, flags); rt_mutex_adjust_prio_chain(owner, 0, lock, NULL, current); - spin_lock(&lock->wait_lock); + spin_lock_irq(&lock->wait_lock); } /* @@ -599,14 +616,302 @@ void rt_mutex_adjust_pi(struct task_stru return; } - spin_unlock_irqrestore(&task->pi_lock, flags); - /* gets dropped in rt_mutex_adjust_prio_chain()! */ get_task_struct(task); + spin_unlock_irqrestore(&task->pi_lock, flags); + rt_mutex_adjust_prio_chain(task, 0, NULL, NULL, task); } /* + * preemptible spin_lock functions: + */ + +#ifdef CONFIG_PREEMPT_RT + +static inline void +rt_spin_lock_fastlock(struct rt_mutex *lock, + void (*slowfn)(struct rt_mutex *lock)) +{ + might_sleep(); + + if (likely(rt_mutex_cmpxchg(lock, NULL, current))) + rt_mutex_deadlock_account_lock(lock, current); + else + slowfn(lock); +} + +static inline void +rt_spin_lock_fastunlock(struct rt_mutex *lock, + void (*slowfn)(struct rt_mutex *lock)) +{ + if (likely(rt_mutex_cmpxchg(lock, current, NULL))) + rt_mutex_deadlock_account_unlock(current); + else + slowfn(lock); +} + +/* + * Slow path lock function spin_lock style: this variant is very + * careful not to miss any non-lock wakeups. + * + * The wakeup side uses wake_up_process_mutex, which, combined with + * the xchg code of this function is a transparent sleep/wakeup + * mechanism nested within any existing sleep/wakeup mechanism. This + * enables the seemless use of arbitrary (blocking) spinlocks within + * sleep/wakeup event loops. + */ +static void noinline __sched +rt_spin_lock_slowlock(struct rt_mutex *lock) +{ + struct rt_mutex_waiter waiter; + unsigned long saved_state, state, flags; + + debug_rt_mutex_init_waiter(&waiter); + waiter.task = NULL; + + spin_lock_irqsave(&lock->wait_lock, flags); + init_lists(lock); + + /* Try to acquire the lock again: */ + if (try_to_take_rt_mutex(lock)) { + spin_unlock_irqrestore(&lock->wait_lock, flags); + return; + } + + BUG_ON(rt_mutex_owner(lock) == current); + + /* + * Here we save whatever state the task was in originally, + * we'll restore it at the end of the function and we'll take + * any intermediate wakeup into account as well, independently + * of the lock sleep/wakeup mechanism. When we get a real + * wakeup the task->state is TASK_RUNNING and we change + * saved_state accordingly. If we did not get a real wakeup + * then we return with the saved state. + */ + saved_state = xchg(¤t->state, TASK_UNINTERRUPTIBLE); + + for (;;) { + unsigned long saved_flags; + int saved_lock_depth = current->lock_depth; + + /* Try to acquire the lock */ + if (try_to_take_rt_mutex(lock)) + break; + /* + * waiter.task is NULL the first time we come here and + * when we have been woken up by the previous owner + * but the lock got stolen by an higher prio task. + */ + if (!waiter.task) { + task_blocks_on_rt_mutex(lock, &waiter, 0, flags); + /* Wakeup during boost ? */ + if (unlikely(!waiter.task)) + continue; + } + + /* + * Prevent schedule() to drop BKL, while waiting for + * the lock ! We restore lock_depth when we come back. + */ + saved_flags = current->flags & PF_NOSCHED; + current->lock_depth = -1; + current->flags &= ~PF_NOSCHED; + spin_unlock_irqrestore(&lock->wait_lock, flags); + + debug_rt_mutex_print_deadlock(&waiter); + + schedule_rt_mutex(lock); + + spin_lock_irqsave(&lock->wait_lock, flags); + current->flags |= saved_flags; + current->lock_depth = saved_lock_depth; + state = xchg(¤t->state, TASK_UNINTERRUPTIBLE); + if (unlikely(state == TASK_RUNNING)) + saved_state = TASK_RUNNING; + } + + state = xchg(¤t->state, saved_state); + if (unlikely(state == TASK_RUNNING)) + current->state = TASK_RUNNING; + + /* + * Extremely rare case, if we got woken up by a non-mutex wakeup, + * and we managed to steal the lock despite us not being the + * highest-prio waiter (due to SCHED_OTHER changing prio), then we + * can end up with a non-NULL waiter.task: + */ + if (unlikely(waiter.task)) + remove_waiter(lock, &waiter, flags); + /* + * try_to_take_rt_mutex() sets the waiter bit + * unconditionally. We might have to fix that up: + */ + fixup_rt_mutex_waiters(lock); + + spin_unlock_irqrestore(&lock->wait_lock, flags); + + debug_rt_mutex_free_waiter(&waiter); +} + +/* + * Slow path to release a rt_mutex spin_lock style + */ +static void noinline __sched +rt_spin_lock_slowunlock(struct rt_mutex *lock) +{ + unsigned long flags; + + spin_lock_irqsave(&lock->wait_lock, flags); + + debug_rt_mutex_unlock(lock); + + rt_mutex_deadlock_account_unlock(current); + + if (!rt_mutex_has_waiters(lock)) { + lock->owner = NULL; + spin_unlock_irqrestore(&lock->wait_lock, flags); + return; + } + + wakeup_next_waiter(lock, 1); + + spin_unlock_irqrestore(&lock->wait_lock, flags); + + /* Undo pi boosting.when necessary */ + rt_mutex_adjust_prio(current); +} + +void __lockfunc rt_spin_lock(spinlock_t *lock) +{ + rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock); + spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); +} +EXPORT_SYMBOL(rt_spin_lock); + +void __lockfunc __rt_spin_lock(struct rt_mutex *lock) +{ + rt_spin_lock_fastlock(lock, rt_spin_lock_slowlock); +} +EXPORT_SYMBOL(__rt_spin_lock); + +#ifdef CONFIG_DEBUG_LOCK_ALLOC + +void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass) +{ + rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock); + spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_); +} +EXPORT_SYMBOL(rt_spin_lock_nested); + +#endif + +void __lockfunc rt_spin_unlock(spinlock_t *lock) +{ + /* NOTE: we always pass in '1' for nested, for simplicity */ + spin_release(&lock->dep_map, 1, _RET_IP_); + rt_spin_lock_fastunlock(&lock->lock, rt_spin_lock_slowunlock); +} +EXPORT_SYMBOL(rt_spin_unlock); + +void __lockfunc __rt_spin_unlock(struct rt_mutex *lock) +{ + rt_spin_lock_fastunlock(lock, rt_spin_lock_slowunlock); +} +EXPORT_SYMBOL(__rt_spin_unlock); + +/* + * Wait for the lock to get unlocked: instead of polling for an unlock + * (like raw spinlocks do), we lock and unlock, to force the kernel to + * schedule if there's contention: + */ +void __lockfunc rt_spin_unlock_wait(spinlock_t *lock) +{ + spin_lock(lock); + spin_unlock(lock); +} +EXPORT_SYMBOL(rt_spin_unlock_wait); + +int __lockfunc rt_spin_trylock(spinlock_t *lock) +{ + int ret = rt_mutex_trylock(&lock->lock); + + if (ret) + spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); + + return ret; +} +EXPORT_SYMBOL(rt_spin_trylock); + +int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags) +{ + int ret; + + *flags = 0; + ret = rt_mutex_trylock(&lock->lock); + if (ret) + spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); + + return ret; +} +EXPORT_SYMBOL(rt_spin_trylock_irqsave); + +int _atomic_dec_and_spin_lock(spinlock_t *lock, atomic_t *atomic) +{ + /* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */ + if (atomic_add_unless(atomic, -1, 1)) + return 0; + rt_spin_lock(lock); + if (atomic_dec_and_test(atomic)) + return 1; + rt_spin_unlock(lock); + return 0; +} +EXPORT_SYMBOL(_atomic_dec_and_spin_lock); + +void +__rt_spin_lock_init(spinlock_t *lock, char *name, struct lock_class_key *key) +{ +#ifdef CONFIG_DEBUG_LOCK_ALLOC + /* + * Make sure we are not reinitializing a held lock: + */ + debug_check_no_locks_freed((void *)lock, sizeof(*lock)); + lockdep_init_map(&lock->dep_map, name, key, 0); +#endif + __rt_mutex_init(&lock->lock, name); +} +EXPORT_SYMBOL(__rt_spin_lock_init); + +#endif + +static inline int rt_release_bkl(struct rt_mutex *lock, unsigned long flags) +{ + int saved_lock_depth = current->lock_depth; + + current->lock_depth = -1; + /* + * try_to_take_lock set the waiters, make sure it's + * still correct. + */ + fixup_rt_mutex_waiters(lock); + spin_unlock_irqrestore(&lock->wait_lock, flags); + + up(&kernel_sem); + + spin_lock_irq(&lock->wait_lock); + + return saved_lock_depth; +} + +static inline void rt_reacquire_bkl(int saved_lock_depth) +{ + down(&kernel_sem); + current->lock_depth = saved_lock_depth; +} + +/* * Slow path lock function: */ static int __sched @@ -614,20 +919,29 @@ rt_mutex_slowlock(struct rt_mutex *lock, struct hrtimer_sleeper *timeout, int detect_deadlock) { + int ret = 0, saved_lock_depth = -1; struct rt_mutex_waiter waiter; - int ret = 0; + unsigned long flags; debug_rt_mutex_init_waiter(&waiter); waiter.task = NULL; - spin_lock(&lock->wait_lock); + spin_lock_irqsave(&lock->wait_lock, flags); + init_lists(lock); /* Try to acquire the lock again: */ if (try_to_take_rt_mutex(lock)) { - spin_unlock(&lock->wait_lock); + spin_unlock_irqrestore(&lock->wait_lock, flags); return 0; } + /* + * We drop the BKL here before we go into the wait loop to avoid a + * possible deadlock in the scheduler. + */ + if (unlikely(current->lock_depth >= 0)) + saved_lock_depth = rt_release_bkl(lock, flags); + set_current_state(state); /* Setup the timer, when timeout != NULL */ @@ -639,6 +953,8 @@ rt_mutex_slowlock(struct rt_mutex *lock, } for (;;) { + unsigned long saved_flags; + /* Try to acquire the lock: */ if (try_to_take_rt_mutex(lock)) break; @@ -664,7 +980,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, */ if (!waiter.task) { ret = task_blocks_on_rt_mutex(lock, &waiter, - detect_deadlock); + detect_deadlock, flags); /* * If we got woken up by the owner then start loop * all over without going into schedule to try @@ -683,22 +999,26 @@ rt_mutex_slowlock(struct rt_mutex *lock, if (unlikely(ret)) break; } + saved_flags = current->flags & PF_NOSCHED; + current->flags &= ~PF_NOSCHED; - spin_unlock(&lock->wait_lock); + spin_unlock_irq(&lock->wait_lock); debug_rt_mutex_print_deadlock(&waiter); if (waiter.task) schedule_rt_mutex(lock); - spin_lock(&lock->wait_lock); + spin_lock_irq(&lock->wait_lock); + + current->flags |= saved_flags; set_current_state(state); } set_current_state(TASK_RUNNING); if (unlikely(waiter.task)) - remove_waiter(lock, &waiter); + remove_waiter(lock, &waiter, flags); /* * try_to_take_rt_mutex() sets the waiter bit @@ -706,7 +1026,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, */ fixup_rt_mutex_waiters(lock); - spin_unlock(&lock->wait_lock); + spin_unlock_irqrestore(&lock->wait_lock, flags); /* Remove pending timer: */ if (unlikely(timeout)) @@ -720,6 +1040,10 @@ rt_mutex_slowlock(struct rt_mutex *lock, if (unlikely(ret)) rt_mutex_adjust_prio(current); + /* Must we reaquire the BKL? */ + if (unlikely(saved_lock_depth >= 0)) + rt_reacquire_bkl(saved_lock_depth); + debug_rt_mutex_free_waiter(&waiter); return ret; @@ -731,12 +1055,15 @@ rt_mutex_slowlock(struct rt_mutex *lock, static inline int rt_mutex_slowtrylock(struct rt_mutex *lock) { + unsigned long flags; int ret = 0; - spin_lock(&lock->wait_lock); + spin_lock_irqsave(&lock->wait_lock, flags); if (likely(rt_mutex_owner(lock) != current)) { + init_lists(lock); + ret = try_to_take_rt_mutex(lock); /* * try_to_take_rt_mutex() sets the lock waiters @@ -745,7 +1072,7 @@ rt_mutex_slowtrylock(struct rt_mutex *lo fixup_rt_mutex_waiters(lock); } - spin_unlock(&lock->wait_lock); + spin_unlock_irqrestore(&lock->wait_lock, flags); return ret; } @@ -756,7 +1083,9 @@ rt_mutex_slowtrylock(struct rt_mutex *lo static void __sched rt_mutex_slowunlock(struct rt_mutex *lock) { - spin_lock(&lock->wait_lock); + unsigned long flags; + + spin_lock_irqsave(&lock->wait_lock, flags); debug_rt_mutex_unlock(lock); @@ -764,13 +1093,13 @@ rt_mutex_slowunlock(struct rt_mutex *loc if (!rt_mutex_has_waiters(lock)) { lock->owner = NULL; - spin_unlock(&lock->wait_lock); + spin_unlock_irqrestore(&lock->wait_lock, flags); return; } - wakeup_next_waiter(lock); + wakeup_next_waiter(lock, 0); - spin_unlock(&lock->wait_lock); + spin_unlock_irqrestore(&lock->wait_lock, flags); /* Undo pi boosting if necessary: */ rt_mutex_adjust_prio(current); @@ -832,6 +1161,27 @@ rt_mutex_fastunlock(struct rt_mutex *loc } /** + * rt_mutex_lock_killable - lock a rt_mutex killable + * + * @lock: the rt_mutex to be locked + * @detect_deadlock: deadlock detection on/off + * + * Returns: + * 0 on success + * -EINTR when interrupted by a signal + * -EDEADLK when the lock would deadlock (when deadlock detection is on) + */ +int __sched rt_mutex_lock_killable(struct rt_mutex *lock, + int detect_deadlock) +{ + might_sleep(); + + return rt_mutex_fastlock(lock, TASK_KILLABLE, + detect_deadlock, rt_mutex_slowlock); +} +EXPORT_SYMBOL_GPL(rt_mutex_lock_killable); + +/** * rt_mutex_lock - lock a rt_mutex * * @lock: the rt_mutex to be locked Index: linux-2.6.26/kernel/rwsem.c =================================================================== --- linux-2.6.26.orig/kernel/rwsem.c +++ linux-2.6.26/kernel/rwsem.c @@ -16,7 +16,7 @@ /* * lock for reading */ -void __sched down_read(struct rw_semaphore *sem) +void __sched compat_down_read(struct compat_rw_semaphore *sem) { might_sleep(); rwsem_acquire_read(&sem->dep_map, 0, 0, _RET_IP_); @@ -24,12 +24,12 @@ void __sched down_read(struct rw_semapho LOCK_CONTENDED(sem, __down_read_trylock, __down_read); } -EXPORT_SYMBOL(down_read); +EXPORT_SYMBOL(compat_down_read); /* * trylock for reading -- returns 1 if successful, 0 if contention */ -int down_read_trylock(struct rw_semaphore *sem) +int compat_down_read_trylock(struct compat_rw_semaphore *sem) { int ret = __down_read_trylock(sem); @@ -38,12 +38,12 @@ int down_read_trylock(struct rw_semaphor return ret; } -EXPORT_SYMBOL(down_read_trylock); +EXPORT_SYMBOL(compat_down_read_trylock); /* * lock for writing */ -void __sched down_write(struct rw_semaphore *sem) +void __sched compat_down_write(struct compat_rw_semaphore *sem) { might_sleep(); rwsem_acquire(&sem->dep_map, 0, 0, _RET_IP_); @@ -51,12 +51,12 @@ void __sched down_write(struct rw_semaph LOCK_CONTENDED(sem, __down_write_trylock, __down_write); } -EXPORT_SYMBOL(down_write); +EXPORT_SYMBOL(compat_down_write); /* * trylock for writing -- returns 1 if successful, 0 if contention */ -int down_write_trylock(struct rw_semaphore *sem) +int compat_down_write_trylock(struct compat_rw_semaphore *sem) { int ret = __down_write_trylock(sem); @@ -65,36 +65,36 @@ int down_write_trylock(struct rw_semapho return ret; } -EXPORT_SYMBOL(down_write_trylock); +EXPORT_SYMBOL(compat_down_write_trylock); /* * release a read lock */ -void up_read(struct rw_semaphore *sem) +void compat_up_read(struct compat_rw_semaphore *sem) { rwsem_release(&sem->dep_map, 1, _RET_IP_); __up_read(sem); } -EXPORT_SYMBOL(up_read); +EXPORT_SYMBOL(compat_up_read); /* * release a write lock */ -void up_write(struct rw_semaphore *sem) +void compat_up_write(struct compat_rw_semaphore *sem) { rwsem_release(&sem->dep_map, 1, _RET_IP_); __up_write(sem); } -EXPORT_SYMBOL(up_write); +EXPORT_SYMBOL(compat_up_write); /* * downgrade write lock to read lock */ -void downgrade_write(struct rw_semaphore *sem) +void compat_downgrade_write(struct compat_rw_semaphore *sem) { /* * lockdep: a downgraded write will live on as a write @@ -103,11 +103,11 @@ void downgrade_write(struct rw_semaphore __downgrade_write(sem); } -EXPORT_SYMBOL(downgrade_write); +EXPORT_SYMBOL(compat_downgrade_write); #ifdef CONFIG_DEBUG_LOCK_ALLOC -void down_read_nested(struct rw_semaphore *sem, int subclass) +void compat_down_read_nested(struct compat_rw_semaphore *sem, int subclass) { might_sleep(); rwsem_acquire_read(&sem->dep_map, subclass, 0, _RET_IP_); @@ -115,18 +115,18 @@ void down_read_nested(struct rw_semaphor LOCK_CONTENDED(sem, __down_read_trylock, __down_read); } -EXPORT_SYMBOL(down_read_nested); +EXPORT_SYMBOL(compat_down_read_nested); -void down_read_non_owner(struct rw_semaphore *sem) +void compat_down_read_non_owner(struct compat_rw_semaphore *sem) { might_sleep(); __down_read(sem); } -EXPORT_SYMBOL(down_read_non_owner); +EXPORT_SYMBOL(compat_down_read_non_owner); -void down_write_nested(struct rw_semaphore *sem, int subclass) +void compat_down_write_nested(struct compat_rw_semaphore *sem, int subclass) { might_sleep(); rwsem_acquire(&sem->dep_map, subclass, 0, _RET_IP_); @@ -134,14 +134,14 @@ void down_write_nested(struct rw_semapho LOCK_CONTENDED(sem, __down_write_trylock, __down_write); } -EXPORT_SYMBOL(down_write_nested); +EXPORT_SYMBOL(compat_down_write_nested); -void up_read_non_owner(struct rw_semaphore *sem) +void compat_up_read_non_owner(struct compat_rw_semaphore *sem) { __up_read(sem); } -EXPORT_SYMBOL(up_read_non_owner); +EXPORT_SYMBOL(compat_up_read_non_owner); #endif Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -2106,7 +2106,8 @@ static int sched_balance_self(int cpu, i * * returns failure only if the task is already active. */ -static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync) +static int +try_to_wake_up(struct task_struct *p, unsigned int state, int sync, int mutex) { int cpu, orig_cpu, this_cpu, success = 0; unsigned long flags; @@ -2198,13 +2199,31 @@ out: int wake_up_process(struct task_struct *p) { - return try_to_wake_up(p, TASK_ALL, 0); + return try_to_wake_up(p, TASK_ALL, 0, 0); } EXPORT_SYMBOL(wake_up_process); +int wake_up_process_sync(struct task_struct * p) +{ + return try_to_wake_up(p, TASK_ALL, 1, 0); +} +EXPORT_SYMBOL(wake_up_process_sync); + +int wake_up_process_mutex(struct task_struct * p) +{ + return try_to_wake_up(p, TASK_ALL, 0, 1); +} +EXPORT_SYMBOL(wake_up_process_mutex); + +int wake_up_process_mutex_sync(struct task_struct * p) +{ + return try_to_wake_up(p, TASK_ALL, 1, 1); +} +EXPORT_SYMBOL(wake_up_process_mutex_sync); + int wake_up_state(struct task_struct *p, unsigned int state) { - return try_to_wake_up(p, state, 0); + return try_to_wake_up(p, state | TASK_RUNNING_MUTEX, 0, 0); } /* @@ -4408,7 +4427,8 @@ asmlinkage void __sched preempt_schedule int default_wake_function(wait_queue_t *curr, unsigned mode, int sync, void *key) { - return try_to_wake_up(curr->private, mode, sync); + return try_to_wake_up(curr->private, mode | TASK_RUNNING_MUTEX, + sync, 0); } EXPORT_SYMBOL(default_wake_function); @@ -4448,7 +4468,7 @@ void __wake_up(wait_queue_head_t *q, uns unsigned long flags; spin_lock_irqsave(&q->lock, flags); - __wake_up_common(q, mode, nr_exclusive, 0, key); + __wake_up_common(q, mode, nr_exclusive, 1, key); spin_unlock_irqrestore(&q->lock, flags); } EXPORT_SYMBOL(__wake_up); @@ -4498,7 +4518,7 @@ void complete(struct completion *x) spin_lock_irqsave(&x->wait.lock, flags); x->done++; - __wake_up_common(&x->wait, TASK_NORMAL, 1, 0, NULL); + __wake_up_common(&x->wait, TASK_NORMAL, 1, 1, NULL); spin_unlock_irqrestore(&x->wait.lock, flags); } EXPORT_SYMBOL(complete); @@ -4509,11 +4529,17 @@ void complete_all(struct completion *x) spin_lock_irqsave(&x->wait.lock, flags); x->done += UINT_MAX/2; - __wake_up_common(&x->wait, TASK_NORMAL, 0, 0, NULL); + __wake_up_common(&x->wait, TASK_NORMAL, 0, 1, NULL); spin_unlock_irqrestore(&x->wait.lock, flags); } EXPORT_SYMBOL(complete_all); +unsigned int completion_done(struct completion *x) +{ + return x->done; +} +EXPORT_SYMBOL(completion_done); + static inline long __sched do_wait_for_common(struct completion *x, long timeout, int state) { @@ -5283,10 +5309,7 @@ asmlinkage long sys_sched_yield(void) * Since we are going to call schedule() anyway, there's * no need to preempt or enable interrupts: */ - __release(rq->lock); - spin_release(&rq->lock.dep_map, 1, _THIS_IP_); - _raw_spin_unlock(&rq->lock); - preempt_enable_no_resched(); + spin_unlock_no_resched(&rq->lock); schedule(); @@ -5329,13 +5352,13 @@ EXPORT_SYMBOL(_cond_resched); * operations here to prevent schedule() from being called twice (once via * spin_unlock(), once by hand). */ -int cond_resched_lock(spinlock_t *lock) +int __cond_resched_raw_spinlock(raw_spinlock_t *lock) { int resched = need_resched() && system_state == SYSTEM_RUNNING; int ret = 0; if (spin_needbreak(lock) || resched) { - spin_unlock(lock); + spin_unlock_no_resched(lock); if (resched && need_resched()) __cond_resched(); else @@ -5345,15 +5368,16 @@ int cond_resched_lock(spinlock_t *lock) } return ret; } -EXPORT_SYMBOL(cond_resched_lock); +EXPORT_SYMBOL(__cond_resched_raw_spinlock); /* * Voluntarily preempt a process context that has softirqs disabled: */ int __sched cond_resched_softirq(void) { +#ifndef CONFIG_PREEMPT_RT WARN_ON_ONCE(!in_softirq()); - +#endif if (need_resched() && system_state == SYSTEM_RUNNING) { local_bh_enable(); __cond_resched(); @@ -5562,19 +5586,23 @@ void sched_show_task(struct task_struct unsigned state; state = p->state ? __ffs(p->state) + 1 : 0; - printk(KERN_INFO "%-13.13s %c", p->comm, - state < sizeof(stat_nam) - 1 ? stat_nam[state] : '?'); + printk("%-13.13s %c [%p]", p->comm, + state < sizeof(stat_nam) - 1 ? stat_nam[state] : '?', p); #if BITS_PER_LONG == 32 - if (state == TASK_RUNNING) + if (0 && (state == TASK_RUNNING)) printk(KERN_CONT " running "); else printk(KERN_CONT " %08lx ", thread_saved_pc(p)); #else - if (state == TASK_RUNNING) + if (0 && (state == TASK_RUNNING)) printk(KERN_CONT " running task "); else printk(KERN_CONT " %016lx ", thread_saved_pc(p)); #endif + if (task_curr(p)) + printk("[curr] "); + else if (p->se.on_rq) + printk("[on rq #%d] ", task_cpu(p)); #ifdef CONFIG_DEBUG_STACK_USAGE { unsigned long *n = end_of_stack(p); Index: linux-2.6.26/kernel/sched_clock.c =================================================================== --- linux-2.6.26.orig/kernel/sched_clock.c +++ linux-2.6.26/kernel/sched_clock.c @@ -38,7 +38,7 @@ struct sched_clock_data { * from within instrumentation code so we dont want to do any * instrumentation ourselves. */ - raw_spinlock_t lock; + __raw_spinlock_t lock; unsigned long prev_jiffies; u64 prev_raw; @@ -70,7 +70,7 @@ void sched_clock_init(void) for_each_possible_cpu(cpu) { struct sched_clock_data *scd = cpu_sdc(cpu); - scd->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; + scd->lock = (__raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; scd->prev_jiffies = now_jiffies; scd->prev_raw = 0; scd->tick_raw = 0; Index: linux-2.6.26/kernel/semaphore.c =================================================================== --- linux-2.6.26.orig/kernel/semaphore.c +++ linux-2.6.26/kernel/semaphore.c @@ -32,11 +32,11 @@ #include #include -static noinline void __down(struct semaphore *sem); -static noinline int __down_interruptible(struct semaphore *sem); -static noinline int __down_killable(struct semaphore *sem); -static noinline int __down_timeout(struct semaphore *sem, long jiffies); -static noinline void __up(struct semaphore *sem); +static noinline void __down(struct compat_semaphore *sem); +static noinline int __down_interruptible(struct compat_semaphore *sem); +static noinline int __down_killable(struct compat_semaphore *sem); +static noinline int __down_timeout(struct compat_semaphore *sem, long jiffies); +static noinline void __up(struct compat_semaphore *sem); /** * down - acquire the semaphore @@ -49,7 +49,7 @@ static noinline void __up(struct semapho * Use of this function is deprecated, please use down_interruptible() or * down_killable() instead. */ -void down(struct semaphore *sem) +void compat_down(struct compat_semaphore *sem) { unsigned long flags; @@ -60,7 +60,7 @@ void down(struct semaphore *sem) __down(sem); spin_unlock_irqrestore(&sem->lock, flags); } -EXPORT_SYMBOL(down); +EXPORT_SYMBOL(compat_down); /** * down_interruptible - acquire the semaphore unless interrupted @@ -71,7 +71,7 @@ EXPORT_SYMBOL(down); * If the sleep is interrupted by a signal, this function will return -EINTR. * If the semaphore is successfully acquired, this function returns 0. */ -int down_interruptible(struct semaphore *sem) +int compat_down_interruptible(struct compat_semaphore *sem) { unsigned long flags; int result = 0; @@ -85,7 +85,7 @@ int down_interruptible(struct semaphore return result; } -EXPORT_SYMBOL(down_interruptible); +EXPORT_SYMBOL(compat_down_interruptible); /** * down_killable - acquire the semaphore unless killed @@ -97,7 +97,7 @@ EXPORT_SYMBOL(down_interruptible); * -EINTR. If the semaphore is successfully acquired, this function returns * 0. */ -int down_killable(struct semaphore *sem) +int compat_down_killable(struct compat_semaphore *sem) { unsigned long flags; int result = 0; @@ -111,7 +111,7 @@ int down_killable(struct semaphore *sem) return result; } -EXPORT_SYMBOL(down_killable); +EXPORT_SYMBOL(compat_down_killable); /** * down_trylock - try to acquire the semaphore, without waiting @@ -126,7 +126,7 @@ EXPORT_SYMBOL(down_killable); * Unlike mutex_trylock, this function can be used from interrupt context, * and the semaphore can be released by any task or interrupt. */ -int down_trylock(struct semaphore *sem) +int compat_down_trylock(struct compat_semaphore *sem) { unsigned long flags; int count; @@ -139,7 +139,7 @@ int down_trylock(struct semaphore *sem) return (count < 0); } -EXPORT_SYMBOL(down_trylock); +EXPORT_SYMBOL(compat_down_trylock); /** * down_timeout - acquire the semaphore within a specified time @@ -151,7 +151,7 @@ EXPORT_SYMBOL(down_trylock); * If the semaphore is not released within the specified number of jiffies, * this function returns -ETIME. It returns 0 if the semaphore was acquired. */ -int down_timeout(struct semaphore *sem, long jiffies) +int compat_down_timeout(struct compat_semaphore *sem, long jiffies) { unsigned long flags; int result = 0; @@ -165,7 +165,7 @@ int down_timeout(struct semaphore *sem, return result; } -EXPORT_SYMBOL(down_timeout); +EXPORT_SYMBOL(compat_down_timeout); /** * up - release the semaphore @@ -174,7 +174,7 @@ EXPORT_SYMBOL(down_timeout); * Release the semaphore. Unlike mutexes, up() may be called from any * context and even by tasks which have never called down(). */ -void up(struct semaphore *sem) +void compat_up(struct compat_semaphore *sem) { unsigned long flags; @@ -185,7 +185,7 @@ void up(struct semaphore *sem) __up(sem); spin_unlock_irqrestore(&sem->lock, flags); } -EXPORT_SYMBOL(up); +EXPORT_SYMBOL(compat_up); /* Functions for the contended case */ @@ -200,7 +200,7 @@ struct semaphore_waiter { * constant, and thus optimised away by the compiler. Likewise the * 'timeout' parameter for the cases without timeouts. */ -static inline int __sched __down_common(struct semaphore *sem, long state, +static inline int __sched __down_common(struct compat_semaphore *sem, long state, long timeout) { struct task_struct *task = current; @@ -234,27 +234,27 @@ static inline int __sched __down_common( return -EINTR; } -static noinline void __sched __down(struct semaphore *sem) +static noinline void __sched __down(struct compat_semaphore *sem) { __down_common(sem, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); } -static noinline int __sched __down_interruptible(struct semaphore *sem) +static noinline int __sched __down_interruptible(struct compat_semaphore *sem) { return __down_common(sem, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); } -static noinline int __sched __down_killable(struct semaphore *sem) +static noinline int __sched __down_killable(struct compat_semaphore *sem) { return __down_common(sem, TASK_KILLABLE, MAX_SCHEDULE_TIMEOUT); } -static noinline int __sched __down_timeout(struct semaphore *sem, long jiffies) +static noinline int __sched __down_timeout(struct compat_semaphore *sem, long jiffies) { return __down_common(sem, TASK_UNINTERRUPTIBLE, jiffies); } -static noinline void __sched __up(struct semaphore *sem) +static noinline void __sched __up(struct compat_semaphore *sem) { struct semaphore_waiter *waiter = list_first_entry(&sem->wait_list, struct semaphore_waiter, list); Index: linux-2.6.26/kernel/spinlock.c =================================================================== --- linux-2.6.26.orig/kernel/spinlock.c +++ linux-2.6.26/kernel/spinlock.c @@ -21,7 +21,7 @@ #include #include -int __lockfunc _spin_trylock(spinlock_t *lock) +int __lockfunc __spin_trylock(raw_spinlock_t *lock) { preempt_disable(); if (_raw_spin_trylock(lock)) { @@ -32,9 +32,46 @@ int __lockfunc _spin_trylock(spinlock_t preempt_enable(); return 0; } -EXPORT_SYMBOL(_spin_trylock); +EXPORT_SYMBOL(__spin_trylock); -int __lockfunc _read_trylock(rwlock_t *lock) +int __lockfunc __spin_trylock_irq(raw_spinlock_t *lock) +{ + local_irq_disable(); + preempt_disable(); + + if (_raw_spin_trylock(lock)) { + spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); + return 1; + } + + __preempt_enable_no_resched(); + local_irq_enable(); + preempt_check_resched(); + + return 0; +} +EXPORT_SYMBOL(__spin_trylock_irq); + +int __lockfunc __spin_trylock_irqsave(raw_spinlock_t *lock, + unsigned long *flags) +{ + local_irq_save(*flags); + preempt_disable(); + + if (_raw_spin_trylock(lock)) { + spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); + return 1; + } + + __preempt_enable_no_resched(); + local_irq_restore(*flags); + preempt_check_resched(); + + return 0; +} +EXPORT_SYMBOL(__spin_trylock_irqsave); + +int __lockfunc __read_trylock(raw_rwlock_t *lock) { preempt_disable(); if (_raw_read_trylock(lock)) { @@ -45,9 +82,9 @@ int __lockfunc _read_trylock(rwlock_t *l preempt_enable(); return 0; } -EXPORT_SYMBOL(_read_trylock); +EXPORT_SYMBOL(__read_trylock); -int __lockfunc _write_trylock(rwlock_t *lock) +int __lockfunc __write_trylock(raw_rwlock_t *lock) { preempt_disable(); if (_raw_write_trylock(lock)) { @@ -58,7 +95,21 @@ int __lockfunc _write_trylock(rwlock_t * preempt_enable(); return 0; } -EXPORT_SYMBOL(_write_trylock); +EXPORT_SYMBOL(__write_trylock); + +int __lockfunc __write_trylock_irqsave(raw_rwlock_t *lock, unsigned long *flags) +{ + int ret; + + local_irq_save(*flags); + ret = __write_trylock(lock); + if (ret) + return ret; + + local_irq_restore(*flags); + return 0; +} +EXPORT_SYMBOL(__write_trylock_irqsave); /* * If lockdep is enabled then we use the non-preemption spin-ops @@ -67,15 +118,15 @@ EXPORT_SYMBOL(_write_trylock); */ #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC) -void __lockfunc _read_lock(rwlock_t *lock) +void __lockfunc __read_lock(raw_rwlock_t *lock) { preempt_disable(); rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_); LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock); } -EXPORT_SYMBOL(_read_lock); +EXPORT_SYMBOL(__read_lock); -unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock) +unsigned long __lockfunc __spin_lock_irqsave(raw_spinlock_t *lock) { unsigned long flags; @@ -94,27 +145,27 @@ unsigned long __lockfunc _spin_lock_irqs #endif return flags; } -EXPORT_SYMBOL(_spin_lock_irqsave); +EXPORT_SYMBOL(__spin_lock_irqsave); -void __lockfunc _spin_lock_irq(spinlock_t *lock) +void __lockfunc __spin_lock_irq(raw_spinlock_t *lock) { local_irq_disable(); preempt_disable(); spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock); } -EXPORT_SYMBOL(_spin_lock_irq); +EXPORT_SYMBOL(__spin_lock_irq); -void __lockfunc _spin_lock_bh(spinlock_t *lock) +void __lockfunc __spin_lock_bh(raw_spinlock_t *lock) { local_bh_disable(); preempt_disable(); spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock); } -EXPORT_SYMBOL(_spin_lock_bh); +EXPORT_SYMBOL(__spin_lock_bh); -unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock) +unsigned long __lockfunc __read_lock_irqsave(raw_rwlock_t *lock) { unsigned long flags; @@ -124,27 +175,27 @@ unsigned long __lockfunc _read_lock_irqs LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock); return flags; } -EXPORT_SYMBOL(_read_lock_irqsave); +EXPORT_SYMBOL(__read_lock_irqsave); -void __lockfunc _read_lock_irq(rwlock_t *lock) +void __lockfunc __read_lock_irq(raw_rwlock_t *lock) { local_irq_disable(); preempt_disable(); rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_); LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock); } -EXPORT_SYMBOL(_read_lock_irq); +EXPORT_SYMBOL(__read_lock_irq); -void __lockfunc _read_lock_bh(rwlock_t *lock) +void __lockfunc __read_lock_bh(raw_rwlock_t *lock) { local_bh_disable(); preempt_disable(); rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_); LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock); } -EXPORT_SYMBOL(_read_lock_bh); +EXPORT_SYMBOL(__read_lock_bh); -unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock) +unsigned long __lockfunc __write_lock_irqsave(raw_rwlock_t *lock) { unsigned long flags; @@ -154,43 +205,43 @@ unsigned long __lockfunc _write_lock_irq LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock); return flags; } -EXPORT_SYMBOL(_write_lock_irqsave); +EXPORT_SYMBOL(__write_lock_irqsave); -void __lockfunc _write_lock_irq(rwlock_t *lock) +void __lockfunc __write_lock_irq(raw_rwlock_t *lock) { local_irq_disable(); preempt_disable(); rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_); LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock); } -EXPORT_SYMBOL(_write_lock_irq); +EXPORT_SYMBOL(__write_lock_irq); -void __lockfunc _write_lock_bh(rwlock_t *lock) +void __lockfunc __write_lock_bh(raw_rwlock_t *lock) { local_bh_disable(); preempt_disable(); rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_); LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock); } -EXPORT_SYMBOL(_write_lock_bh); +EXPORT_SYMBOL(__write_lock_bh); -void __lockfunc _spin_lock(spinlock_t *lock) +void __lockfunc __spin_lock(raw_spinlock_t *lock) { preempt_disable(); spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock); } -EXPORT_SYMBOL(_spin_lock); +EXPORT_SYMBOL(__spin_lock); -void __lockfunc _write_lock(rwlock_t *lock) +void __lockfunc __write_lock(raw_rwlock_t *lock) { preempt_disable(); rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_); LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock); } -EXPORT_SYMBOL(_write_lock); +EXPORT_SYMBOL(__write_lock); #else /* CONFIG_PREEMPT: */ @@ -203,7 +254,7 @@ EXPORT_SYMBOL(_write_lock); */ #define BUILD_LOCK_OPS(op, locktype) \ -void __lockfunc _##op##_lock(locktype##_t *lock) \ +void __lockfunc __##op##_lock(locktype##_t *lock) \ { \ for (;;) { \ preempt_disable(); \ @@ -213,15 +264,16 @@ void __lockfunc _##op##_lock(locktype##_ \ if (!(lock)->break_lock) \ (lock)->break_lock = 1; \ - while (!op##_can_lock(lock) && (lock)->break_lock) \ - _raw_##op##_relax(&lock->raw_lock); \ + while (!__raw_##op##_can_lock(&(lock)->raw_lock) && \ + (lock)->break_lock) \ + __raw_##op##_relax(&lock->raw_lock); \ } \ (lock)->break_lock = 0; \ } \ \ -EXPORT_SYMBOL(_##op##_lock); \ +EXPORT_SYMBOL(__##op##_lock); \ \ -unsigned long __lockfunc _##op##_lock_irqsave(locktype##_t *lock) \ +unsigned long __lockfunc __##op##_lock_irqsave(locktype##_t *lock) \ { \ unsigned long flags; \ \ @@ -235,23 +287,24 @@ unsigned long __lockfunc _##op##_lock_ir \ if (!(lock)->break_lock) \ (lock)->break_lock = 1; \ - while (!op##_can_lock(lock) && (lock)->break_lock) \ - _raw_##op##_relax(&lock->raw_lock); \ + while (!__raw_##op##_can_lock(&(lock)->raw_lock) && \ + (lock)->break_lock) \ + __raw_##op##_relax(&lock->raw_lock); \ } \ (lock)->break_lock = 0; \ return flags; \ } \ \ -EXPORT_SYMBOL(_##op##_lock_irqsave); \ +EXPORT_SYMBOL(__##op##_lock_irqsave); \ \ -void __lockfunc _##op##_lock_irq(locktype##_t *lock) \ +void __lockfunc __##op##_lock_irq(locktype##_t *lock) \ { \ - _##op##_lock_irqsave(lock); \ + __##op##_lock_irqsave(lock); \ } \ \ -EXPORT_SYMBOL(_##op##_lock_irq); \ +EXPORT_SYMBOL(__##op##_lock_irq); \ \ -void __lockfunc _##op##_lock_bh(locktype##_t *lock) \ +void __lockfunc __##op##_lock_bh(locktype##_t *lock) \ { \ unsigned long flags; \ \ @@ -260,39 +313,40 @@ void __lockfunc _##op##_lock_bh(locktype /* irq-disabling. We use the generic preemption-aware */ \ /* function: */ \ /**/ \ - flags = _##op##_lock_irqsave(lock); \ + flags = __##op##_lock_irqsave(lock); \ local_bh_disable(); \ local_irq_restore(flags); \ } \ \ -EXPORT_SYMBOL(_##op##_lock_bh) +EXPORT_SYMBOL(__##op##_lock_bh) /* * Build preemption-friendly versions of the following * lock-spinning functions: * - * _[spin|read|write]_lock() - * _[spin|read|write]_lock_irq() - * _[spin|read|write]_lock_irqsave() - * _[spin|read|write]_lock_bh() + * __[spin|read|write]_lock() + * __[spin|read|write]_lock_irq() + * __[spin|read|write]_lock_irqsave() + * __[spin|read|write]_lock_bh() */ -BUILD_LOCK_OPS(spin, spinlock); -BUILD_LOCK_OPS(read, rwlock); -BUILD_LOCK_OPS(write, rwlock); +BUILD_LOCK_OPS(spin, raw_spinlock); +BUILD_LOCK_OPS(read, raw_rwlock); +BUILD_LOCK_OPS(write, raw_rwlock); #endif /* CONFIG_PREEMPT */ #ifdef CONFIG_DEBUG_LOCK_ALLOC -void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass) +void __lockfunc __spin_lock_nested(raw_spinlock_t *lock, int subclass) { preempt_disable(); spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_); LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock); } +EXPORT_SYMBOL(__spin_lock_nested); -EXPORT_SYMBOL(_spin_lock_nested); -unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass) +unsigned long __lockfunc +__spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass) { unsigned long flags; @@ -311,117 +365,130 @@ unsigned long __lockfunc _spin_lock_irqs #endif return flags; } - -EXPORT_SYMBOL(_spin_lock_irqsave_nested); +EXPORT_SYMBOL(__spin_lock_irqsave_nested); #endif -void __lockfunc _spin_unlock(spinlock_t *lock) +void __lockfunc __spin_unlock(raw_spinlock_t *lock) { spin_release(&lock->dep_map, 1, _RET_IP_); _raw_spin_unlock(lock); preempt_enable(); } -EXPORT_SYMBOL(_spin_unlock); +EXPORT_SYMBOL(__spin_unlock); + +void __lockfunc __spin_unlock_no_resched(raw_spinlock_t *lock) +{ + spin_release(&lock->dep_map, 1, _RET_IP_); + _raw_spin_unlock(lock); + __preempt_enable_no_resched(); +} +/* not exported */ -void __lockfunc _write_unlock(rwlock_t *lock) +void __lockfunc __write_unlock(raw_rwlock_t *lock) { rwlock_release(&lock->dep_map, 1, _RET_IP_); _raw_write_unlock(lock); preempt_enable(); } -EXPORT_SYMBOL(_write_unlock); +EXPORT_SYMBOL(__write_unlock); -void __lockfunc _read_unlock(rwlock_t *lock) +void __lockfunc __read_unlock(raw_rwlock_t *lock) { rwlock_release(&lock->dep_map, 1, _RET_IP_); _raw_read_unlock(lock); preempt_enable(); } -EXPORT_SYMBOL(_read_unlock); +EXPORT_SYMBOL(__read_unlock); -void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags) +void __lockfunc __spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags) { spin_release(&lock->dep_map, 1, _RET_IP_); _raw_spin_unlock(lock); + __preempt_enable_no_resched(); local_irq_restore(flags); - preempt_enable(); + preempt_check_resched(); } -EXPORT_SYMBOL(_spin_unlock_irqrestore); +EXPORT_SYMBOL(__spin_unlock_irqrestore); -void __lockfunc _spin_unlock_irq(spinlock_t *lock) +void __lockfunc __spin_unlock_irq(raw_spinlock_t *lock) { spin_release(&lock->dep_map, 1, _RET_IP_); _raw_spin_unlock(lock); + __preempt_enable_no_resched(); local_irq_enable(); - preempt_enable(); + preempt_check_resched(); } -EXPORT_SYMBOL(_spin_unlock_irq); +EXPORT_SYMBOL(__spin_unlock_irq); -void __lockfunc _spin_unlock_bh(spinlock_t *lock) +void __lockfunc __spin_unlock_bh(raw_spinlock_t *lock) { spin_release(&lock->dep_map, 1, _RET_IP_); _raw_spin_unlock(lock); - preempt_enable_no_resched(); + __preempt_enable_no_resched(); local_bh_enable_ip((unsigned long)__builtin_return_address(0)); } -EXPORT_SYMBOL(_spin_unlock_bh); +EXPORT_SYMBOL(__spin_unlock_bh); -void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags) +void __lockfunc __read_unlock_irqrestore(raw_rwlock_t *lock, unsigned long flags) { rwlock_release(&lock->dep_map, 1, _RET_IP_); _raw_read_unlock(lock); + __preempt_enable_no_resched(); local_irq_restore(flags); - preempt_enable(); + preempt_check_resched(); } -EXPORT_SYMBOL(_read_unlock_irqrestore); +EXPORT_SYMBOL(__read_unlock_irqrestore); -void __lockfunc _read_unlock_irq(rwlock_t *lock) +void __lockfunc __read_unlock_irq(raw_rwlock_t *lock) { rwlock_release(&lock->dep_map, 1, _RET_IP_); _raw_read_unlock(lock); + __preempt_enable_no_resched(); local_irq_enable(); - preempt_enable(); + preempt_check_resched(); } -EXPORT_SYMBOL(_read_unlock_irq); +EXPORT_SYMBOL(__read_unlock_irq); -void __lockfunc _read_unlock_bh(rwlock_t *lock) +void __lockfunc __read_unlock_bh(raw_rwlock_t *lock) { rwlock_release(&lock->dep_map, 1, _RET_IP_); _raw_read_unlock(lock); - preempt_enable_no_resched(); + __preempt_enable_no_resched(); local_bh_enable_ip((unsigned long)__builtin_return_address(0)); } -EXPORT_SYMBOL(_read_unlock_bh); +EXPORT_SYMBOL(__read_unlock_bh); -void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags) +void __lockfunc __write_unlock_irqrestore(raw_rwlock_t *lock, unsigned long flags) { rwlock_release(&lock->dep_map, 1, _RET_IP_); _raw_write_unlock(lock); + __preempt_enable_no_resched(); local_irq_restore(flags); - preempt_enable(); + preempt_check_resched(); } -EXPORT_SYMBOL(_write_unlock_irqrestore); +EXPORT_SYMBOL(__write_unlock_irqrestore); -void __lockfunc _write_unlock_irq(rwlock_t *lock) +void __lockfunc __write_unlock_irq(raw_rwlock_t *lock) { rwlock_release(&lock->dep_map, 1, _RET_IP_); _raw_write_unlock(lock); + __preempt_enable_no_resched(); local_irq_enable(); - preempt_enable(); + preempt_check_resched(); } -EXPORT_SYMBOL(_write_unlock_irq); +EXPORT_SYMBOL(__write_unlock_irq); -void __lockfunc _write_unlock_bh(rwlock_t *lock) +void __lockfunc __write_unlock_bh(raw_rwlock_t *lock) { rwlock_release(&lock->dep_map, 1, _RET_IP_); _raw_write_unlock(lock); - preempt_enable_no_resched(); + __preempt_enable_no_resched(); local_bh_enable_ip((unsigned long)__builtin_return_address(0)); } -EXPORT_SYMBOL(_write_unlock_bh); +EXPORT_SYMBOL(__write_unlock_bh); -int __lockfunc _spin_trylock_bh(spinlock_t *lock) +int __lockfunc __spin_trylock_bh(raw_spinlock_t *lock) { local_bh_disable(); preempt_disable(); @@ -430,11 +497,11 @@ int __lockfunc _spin_trylock_bh(spinlock return 1; } - preempt_enable_no_resched(); + __preempt_enable_no_resched(); local_bh_enable_ip((unsigned long)__builtin_return_address(0)); return 0; } -EXPORT_SYMBOL(_spin_trylock_bh); +EXPORT_SYMBOL(__spin_trylock_bh); int in_lock_functions(unsigned long addr) { @@ -442,6 +509,17 @@ int in_lock_functions(unsigned long addr extern char __lock_text_start[], __lock_text_end[]; return addr >= (unsigned long)__lock_text_start - && addr < (unsigned long)__lock_text_end; + && addr < (unsigned long)__lock_text_end; } EXPORT_SYMBOL(in_lock_functions); + +void notrace __debug_atomic_dec_and_test(atomic_t *v) +{ + static int warn_once = 1; + + if (!atomic_read(v) && warn_once) { + warn_once = 0; + printk("BUG: atomic counter underflow!\n"); + WARN_ON(1); + } +} Index: linux-2.6.26/kernel/trace/trace.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace.c +++ linux-2.6.26/kernel/trace/trace.c @@ -238,8 +238,8 @@ static const char *trace_options[] = { * This is defined as a raw_spinlock_t in order to help * with performance when lockdep debugging is enabled. */ -static raw_spinlock_t ftrace_max_lock = - (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; +static __raw_spinlock_t ftrace_max_lock = + (__raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; /* * Copy the new maximum trace into the separate maximum-trace @@ -3393,8 +3393,8 @@ __init static int tracer_alloc_buffers(v /* use the LRU flag to differentiate the two buffers */ ClearPageLRU(page); - data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; - max_tr.data[i]->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; + data->lock = (__raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; + max_tr.data[i]->lock = (__raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; /* Only allocate if we are actually using the max trace */ #ifdef CONFIG_TRACER_MAX_TRACE Index: linux-2.6.26/kernel/trace/trace.h =================================================================== --- linux-2.6.26.orig/kernel/trace/trace.h +++ linux-2.6.26/kernel/trace/trace.h @@ -157,7 +157,7 @@ struct trace_entry { struct trace_array_cpu { struct list_head trace_pages; atomic_t disabled; - raw_spinlock_t lock; + __raw_spinlock_t lock; struct lock_class_key lock_key; /* these fields get copied into max-trace: */ Index: linux-2.6.26/lib/dec_and_lock.c =================================================================== --- linux-2.6.26.orig/lib/dec_and_lock.c +++ linux-2.6.26/lib/dec_and_lock.c @@ -17,7 +17,7 @@ * because the spin-lock and the decrement must be * "atomic". */ -int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock) +int __atomic_dec_and_spin_lock(raw_spinlock_t *lock, atomic_t *atomic) { #ifdef CONFIG_SMP /* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */ @@ -32,4 +32,4 @@ int _atomic_dec_and_lock(atomic_t *atomi return 0; } -EXPORT_SYMBOL(_atomic_dec_and_lock); +EXPORT_SYMBOL(__atomic_dec_and_spin_lock); Index: linux-2.6.26/lib/kernel_lock.c =================================================================== --- linux-2.6.26.orig/lib/kernel_lock.c +++ linux-2.6.26/lib/kernel_lock.c @@ -24,7 +24,7 @@ * * Don't use in new code. */ -static DECLARE_MUTEX(kernel_sem); +DECLARE_MUTEX(kernel_sem); /* * Re-acquire the kernel semaphore. @@ -44,7 +44,7 @@ int __lockfunc __reacquire_kernel_lock(v BUG_ON(saved_lock_depth < 0); task->lock_depth = -1; - preempt_enable_no_resched(); + __preempt_enable_no_resched(); down(&kernel_sem); Index: linux-2.6.26/lib/locking-selftest.c =================================================================== --- linux-2.6.26.orig/lib/locking-selftest.c +++ linux-2.6.26/lib/locking-selftest.c @@ -940,6 +940,9 @@ static void dotest(void (*testcase_fn)(v { unsigned long saved_preempt_count = preempt_count(); int expected_failure = 0; +#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_DEBUG_RT_MUTEXES) + int saved_lock_count = current->lock_count; +#endif WARN_ON(irqs_disabled()); @@ -989,6 +992,9 @@ static void dotest(void (*testcase_fn)(v #endif reset_locks(); +#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_DEBUG_RT_MUTEXES) + current->lock_count = saved_lock_count; +#endif } static inline void print_testname(const char *testname) Index: linux-2.6.26/lib/plist.c =================================================================== --- linux-2.6.26.orig/lib/plist.c +++ linux-2.6.26/lib/plist.c @@ -53,7 +53,9 @@ static void plist_check_list(struct list static void plist_check_head(struct plist_head *head) { +#ifndef CONFIG_PREEMPT_RT WARN_ON(!head->lock); +#endif if (head->lock) WARN_ON_SMP(!spin_is_locked(head->lock)); plist_check_list(&head->prio_list); Index: linux-2.6.26/lib/rwsem-spinlock.c =================================================================== --- linux-2.6.26.orig/lib/rwsem-spinlock.c +++ linux-2.6.26/lib/rwsem-spinlock.c @@ -20,7 +20,7 @@ struct rwsem_waiter { /* * initialise the semaphore */ -void __init_rwsem(struct rw_semaphore *sem, const char *name, +void __compat_init_rwsem(struct compat_rw_semaphore *sem, const char *name, struct lock_class_key *key) { #ifdef CONFIG_DEBUG_LOCK_ALLOC @@ -44,8 +44,8 @@ void __init_rwsem(struct rw_semaphore *s * - woken process blocks are discarded from the list after having task zeroed * - writers are only woken if wakewrite is non-zero */ -static inline struct rw_semaphore * -__rwsem_do_wake(struct rw_semaphore *sem, int wakewrite) +static inline struct compat_rw_semaphore * +__rwsem_do_wake(struct compat_rw_semaphore *sem, int wakewrite) { struct rwsem_waiter *waiter; struct task_struct *tsk; @@ -103,8 +103,8 @@ __rwsem_do_wake(struct rw_semaphore *sem /* * wake a single writer */ -static inline struct rw_semaphore * -__rwsem_wake_one_writer(struct rw_semaphore *sem) +static inline struct compat_rw_semaphore * +__rwsem_wake_one_writer(struct compat_rw_semaphore *sem) { struct rwsem_waiter *waiter; struct task_struct *tsk; @@ -125,7 +125,7 @@ __rwsem_wake_one_writer(struct rw_semaph /* * get a read lock on the semaphore */ -void __sched __down_read(struct rw_semaphore *sem) +void __sched __down_read(struct compat_rw_semaphore *sem) { struct rwsem_waiter waiter; struct task_struct *tsk; @@ -168,7 +168,7 @@ void __sched __down_read(struct rw_semap /* * trylock for reading -- returns 1 if successful, 0 if contention */ -int __down_read_trylock(struct rw_semaphore *sem) +int __down_read_trylock(struct compat_rw_semaphore *sem) { unsigned long flags; int ret = 0; @@ -191,7 +191,8 @@ int __down_read_trylock(struct rw_semaph * get a write lock on the semaphore * - we increment the waiting count anyway to indicate an exclusive lock */ -void __sched __down_write_nested(struct rw_semaphore *sem, int subclass) +void __sched +__down_write_nested(struct compat_rw_semaphore *sem, int subclass) { struct rwsem_waiter waiter; struct task_struct *tsk; @@ -231,7 +232,7 @@ void __sched __down_write_nested(struct ; } -void __sched __down_write(struct rw_semaphore *sem) +void __sched __down_write(struct compat_rw_semaphore *sem) { __down_write_nested(sem, 0); } @@ -239,7 +240,7 @@ void __sched __down_write(struct rw_sema /* * trylock for writing -- returns 1 if successful, 0 if contention */ -int __down_write_trylock(struct rw_semaphore *sem) +int __down_write_trylock(struct compat_rw_semaphore *sem) { unsigned long flags; int ret = 0; @@ -260,7 +261,7 @@ int __down_write_trylock(struct rw_semap /* * release a read lock on the semaphore */ -void __up_read(struct rw_semaphore *sem) +void __up_read(struct compat_rw_semaphore *sem) { unsigned long flags; @@ -275,7 +276,7 @@ void __up_read(struct rw_semaphore *sem) /* * release a write lock on the semaphore */ -void __up_write(struct rw_semaphore *sem) +void __up_write(struct compat_rw_semaphore *sem) { unsigned long flags; @@ -292,7 +293,7 @@ void __up_write(struct rw_semaphore *sem * downgrade a write lock into a read lock * - just wake up any readers at the front of the queue */ -void __downgrade_write(struct rw_semaphore *sem) +void __downgrade_write(struct compat_rw_semaphore *sem) { unsigned long flags; @@ -305,7 +306,7 @@ void __downgrade_write(struct rw_semapho spin_unlock_irqrestore(&sem->wait_lock, flags); } -EXPORT_SYMBOL(__init_rwsem); +EXPORT_SYMBOL(__compat_init_rwsem); EXPORT_SYMBOL(__down_read); EXPORT_SYMBOL(__down_read_trylock); EXPORT_SYMBOL(__down_write_nested); Index: linux-2.6.26/lib/rwsem.c =================================================================== --- linux-2.6.26.orig/lib/rwsem.c +++ linux-2.6.26/lib/rwsem.c @@ -11,8 +11,8 @@ /* * Initialize an rwsem: */ -void __init_rwsem(struct rw_semaphore *sem, const char *name, - struct lock_class_key *key) +void __compat_init_rwsem(struct rw_semaphore *sem, const char *name, + struct lock_class_key *key) { #ifdef CONFIG_DEBUG_LOCK_ALLOC /* @@ -26,7 +26,7 @@ void __init_rwsem(struct rw_semaphore *s INIT_LIST_HEAD(&sem->wait_list); } -EXPORT_SYMBOL(__init_rwsem); +EXPORT_SYMBOL(__compat_init_rwsem); struct rwsem_waiter { struct list_head list; Index: linux-2.6.26/lib/spinlock_debug.c =================================================================== --- linux-2.6.26.orig/lib/spinlock_debug.c +++ linux-2.6.26/lib/spinlock_debug.c @@ -13,8 +13,8 @@ #include #include -void __spin_lock_init(spinlock_t *lock, const char *name, - struct lock_class_key *key) +void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name, + struct lock_class_key *key) { #ifdef CONFIG_DEBUG_LOCK_ALLOC /* @@ -23,16 +23,16 @@ void __spin_lock_init(spinlock_t *lock, debug_check_no_locks_freed((void *)lock, sizeof(*lock)); lockdep_init_map(&lock->dep_map, name, key, 0); #endif - lock->raw_lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; + lock->raw_lock = (__raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; lock->magic = SPINLOCK_MAGIC; lock->owner = SPINLOCK_OWNER_INIT; lock->owner_cpu = -1; } -EXPORT_SYMBOL(__spin_lock_init); +EXPORT_SYMBOL(__raw_spin_lock_init); -void __rwlock_init(rwlock_t *lock, const char *name, - struct lock_class_key *key) +void __raw_rwlock_init(raw_rwlock_t *lock, const char *name, + struct lock_class_key *key) { #ifdef CONFIG_DEBUG_LOCK_ALLOC /* @@ -41,15 +41,15 @@ void __rwlock_init(rwlock_t *lock, const debug_check_no_locks_freed((void *)lock, sizeof(*lock)); lockdep_init_map(&lock->dep_map, name, key, 0); #endif - lock->raw_lock = (raw_rwlock_t) __RAW_RW_LOCK_UNLOCKED; + lock->raw_lock = (__raw_rwlock_t) __RAW_RW_LOCK_UNLOCKED; lock->magic = RWLOCK_MAGIC; lock->owner = SPINLOCK_OWNER_INIT; lock->owner_cpu = -1; } -EXPORT_SYMBOL(__rwlock_init); +EXPORT_SYMBOL(__raw_rwlock_init); -static void spin_bug(spinlock_t *lock, const char *msg) +static void spin_bug(raw_spinlock_t *lock, const char *msg) { struct task_struct *owner = NULL; @@ -73,7 +73,7 @@ static void spin_bug(spinlock_t *lock, c #define SPIN_BUG_ON(cond, lock, msg) if (unlikely(cond)) spin_bug(lock, msg) static inline void -debug_spin_lock_before(spinlock_t *lock) +debug_spin_lock_before(raw_spinlock_t *lock) { SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic"); SPIN_BUG_ON(lock->owner == current, lock, "recursion"); @@ -81,13 +81,13 @@ debug_spin_lock_before(spinlock_t *lock) lock, "cpu recursion"); } -static inline void debug_spin_lock_after(spinlock_t *lock) +static inline void debug_spin_lock_after(raw_spinlock_t *lock) { lock->owner_cpu = raw_smp_processor_id(); lock->owner = current; } -static inline void debug_spin_unlock(spinlock_t *lock) +static inline void debug_spin_unlock(raw_spinlock_t *lock) { SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic"); SPIN_BUG_ON(!spin_is_locked(lock), lock, "already unlocked"); @@ -98,7 +98,7 @@ static inline void debug_spin_unlock(spi lock->owner_cpu = -1; } -static void __spin_lock_debug(spinlock_t *lock) +static void __spin_lock_debug(raw_spinlock_t *lock) { u64 i; u64 loops = loops_per_jiffy * HZ; @@ -125,7 +125,7 @@ static void __spin_lock_debug(spinlock_t } } -void _raw_spin_lock(spinlock_t *lock) +void __lockfunc _raw_spin_lock(raw_spinlock_t *lock) { debug_spin_lock_before(lock); if (unlikely(!__raw_spin_trylock(&lock->raw_lock))) @@ -133,7 +133,7 @@ void _raw_spin_lock(spinlock_t *lock) debug_spin_lock_after(lock); } -int _raw_spin_trylock(spinlock_t *lock) +int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock) { int ret = __raw_spin_trylock(&lock->raw_lock); @@ -148,13 +148,13 @@ int _raw_spin_trylock(spinlock_t *lock) return ret; } -void _raw_spin_unlock(spinlock_t *lock) +void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock) { debug_spin_unlock(lock); __raw_spin_unlock(&lock->raw_lock); } -static void rwlock_bug(rwlock_t *lock, const char *msg) +static void rwlock_bug(raw_rwlock_t *lock, const char *msg) { if (!debug_locks_off()) return; @@ -167,8 +167,8 @@ static void rwlock_bug(rwlock_t *lock, c #define RWLOCK_BUG_ON(cond, lock, msg) if (unlikely(cond)) rwlock_bug(lock, msg) -#if 0 /* __write_lock_debug() can lock up - maybe this can too? */ -static void __read_lock_debug(rwlock_t *lock) +#if 1 /* __write_lock_debug() can lock up - maybe this can too? */ +static void __raw_read_lock_debug(raw_rwlock_t *lock) { u64 i; u64 loops = loops_per_jiffy * HZ; @@ -193,13 +193,13 @@ static void __read_lock_debug(rwlock_t * } #endif -void _raw_read_lock(rwlock_t *lock) +void __lockfunc _raw_read_lock(raw_rwlock_t *lock) { RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); - __raw_read_lock(&lock->raw_lock); + __raw_read_lock_debug(lock); } -int _raw_read_trylock(rwlock_t *lock) +int __lockfunc _raw_read_trylock(raw_rwlock_t *lock) { int ret = __raw_read_trylock(&lock->raw_lock); @@ -212,13 +212,13 @@ int _raw_read_trylock(rwlock_t *lock) return ret; } -void _raw_read_unlock(rwlock_t *lock) +void __lockfunc _raw_read_unlock(raw_rwlock_t *lock) { RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); __raw_read_unlock(&lock->raw_lock); } -static inline void debug_write_lock_before(rwlock_t *lock) +static inline void debug_write_lock_before(raw_rwlock_t *lock) { RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); RWLOCK_BUG_ON(lock->owner == current, lock, "recursion"); @@ -226,13 +226,13 @@ static inline void debug_write_lock_befo lock, "cpu recursion"); } -static inline void debug_write_lock_after(rwlock_t *lock) +static inline void debug_write_lock_after(raw_rwlock_t *lock) { lock->owner_cpu = raw_smp_processor_id(); lock->owner = current; } -static inline void debug_write_unlock(rwlock_t *lock) +static inline void debug_write_unlock(raw_rwlock_t *lock) { RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); RWLOCK_BUG_ON(lock->owner != current, lock, "wrong owner"); @@ -242,8 +242,8 @@ static inline void debug_write_unlock(rw lock->owner_cpu = -1; } -#if 0 /* This can cause lockups */ -static void __write_lock_debug(rwlock_t *lock) +#if 1 /* This can cause lockups */ +static void __raw_write_lock_debug(raw_rwlock_t *lock) { u64 i; u64 loops = loops_per_jiffy * HZ; @@ -268,14 +268,14 @@ static void __write_lock_debug(rwlock_t } #endif -void _raw_write_lock(rwlock_t *lock) +void __lockfunc _raw_write_lock(raw_rwlock_t *lock) { debug_write_lock_before(lock); - __raw_write_lock(&lock->raw_lock); + __raw_write_lock_debug(lock); debug_write_lock_after(lock); } -int _raw_write_trylock(rwlock_t *lock) +int __lockfunc _raw_write_trylock(raw_rwlock_t *lock) { int ret = __raw_write_trylock(&lock->raw_lock); @@ -290,7 +290,7 @@ int _raw_write_trylock(rwlock_t *lock) return ret; } -void _raw_write_unlock(rwlock_t *lock) +void __lockfunc _raw_write_unlock(raw_rwlock_t *lock) { debug_write_unlock(lock); __raw_write_unlock(&lock->raw_lock); patches/rt-mutex-mips.patch0000664000076400007640000000715711043564040015020 0ustar tglxtglx--- arch/mips/Kconfig | 15 +++++++++++---- include/asm-mips/atomic.h | 26 +++++++++++++++++++++----- 2 files changed, 32 insertions(+), 9 deletions(-) Index: linux-2.6.26/arch/mips/Kconfig =================================================================== --- linux-2.6.26.orig/arch/mips/Kconfig +++ linux-2.6.26/arch/mips/Kconfig @@ -44,6 +44,7 @@ config BCM47XX select CEVT_R4K select CSRC_R4K select DMA_NONCOHERENT + select NO_SPINLOCK select HW_HAS_PCI select IRQ_CPU select SYS_HAS_CPU_MIPS32_R1 @@ -707,10 +708,17 @@ config GENERIC_LOCKBREAK config RWSEM_GENERIC_SPINLOCK bool + depends on !PREEMPT_RT default y config RWSEM_XCHGADD_ALGORITHM bool + depends on !PREEMPT_RT + +config ASM_SEMAPHORES + bool +# depends on !PREEMPT_RT + default y config ARCH_HAS_ILOG2_U32 bool @@ -819,6 +827,9 @@ config DMA_NONCOHERENT config DMA_NEED_PCI_MAP_STATE bool +config NO_SPINLOCK + bool + config EARLY_PRINTK bool "Early printk" if EMBEDDED && DEBUG_KERNEL depends on SYS_HAS_EARLY_PRINTK @@ -1964,10 +1975,6 @@ config SECCOMP endmenu -config RWSEM_GENERIC_SPINLOCK - bool - default y - config LOCKDEP_SUPPORT bool default y Index: linux-2.6.26/include/asm-mips/atomic.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/atomic.h +++ linux-2.6.26/include/asm-mips/atomic.h @@ -171,7 +171,9 @@ static __inline__ int atomic_add_return( : "=&r" (result), "=&r" (temp), "=m" (v->counter) : "Ir" (i), "m" (v->counter) : "memory"); - } else { + } +#if !defined(CONFIG_NO_SPINLOCK) && !defined(CONFIG_PREEMPT_RT) + else { unsigned long flags; raw_local_irq_save(flags); @@ -180,6 +182,7 @@ static __inline__ int atomic_add_return( v->counter = result; raw_local_irq_restore(flags); } +#endif smp_llsc_mb(); @@ -223,7 +226,9 @@ static __inline__ int atomic_sub_return( : "=&r" (result), "=&r" (temp), "=m" (v->counter) : "Ir" (i), "m" (v->counter) : "memory"); - } else { + } +#if !defined(CONFIG_NO_SPINLOCK) && !defined(CONFIG_PREEMPT_RT) + else { unsigned long flags; raw_local_irq_save(flags); @@ -232,6 +237,7 @@ static __inline__ int atomic_sub_return( v->counter = result; raw_local_irq_restore(flags); } +#endif smp_llsc_mb(); @@ -291,7 +297,9 @@ static __inline__ int atomic_sub_if_posi : "=&r" (result), "=&r" (temp), "=m" (v->counter) : "Ir" (i), "m" (v->counter) : "memory"); - } else { + } +#if !defined(CONFIG_NO_SPINLOCK) && !defined(CONFIG_PREEMPT_RT) + else { unsigned long flags; raw_local_irq_save(flags); @@ -301,6 +309,7 @@ static __inline__ int atomic_sub_if_posi v->counter = result; raw_local_irq_restore(flags); } +#endif smp_llsc_mb(); @@ -552,7 +561,9 @@ static __inline__ long atomic64_add_retu : "=&r" (result), "=&r" (temp), "=m" (v->counter) : "Ir" (i), "m" (v->counter) : "memory"); - } else { + } +#if !defined(CONFIG_NO_SPINLOCK) && !defined(CONFIG_PREEMPT_RT) + else { unsigned long flags; raw_local_irq_save(flags); @@ -561,6 +572,8 @@ static __inline__ long atomic64_add_retu v->counter = result; raw_local_irq_restore(flags); } +#endif +#endif smp_llsc_mb(); @@ -604,7 +617,9 @@ static __inline__ long atomic64_sub_retu : "=&r" (result), "=&r" (temp), "=m" (v->counter) : "Ir" (i), "m" (v->counter) : "memory"); - } else { + } +#if !defined(CONFIG_NO_SPINLOCK) && !defined(CONFIG_PREEMPT_RT) + else { unsigned long flags; raw_local_irq_save(flags); @@ -682,6 +697,7 @@ static __inline__ long atomic64_sub_if_p v->counter = result; raw_local_irq_restore(flags); } +#endif smp_llsc_mb(); patches/rt-mutex-ppc.patch0000664000076400007640000004126711043564040014632 0ustar tglxtglx--- arch/powerpc/Kconfig | 15 +++++++------ arch/powerpc/lib/locks.c | 4 +-- arch/ppc/Kconfig | 19 ++++++++++------ arch/ppc/kernel/entry.S | 4 +-- arch/ppc/lib/locks.c | 38 ++++++++++++++++----------------- drivers/macintosh/adb.c | 2 - include/asm-powerpc/rwsem.h | 40 +++++++++++++++++------------------ include/asm-powerpc/spinlock.h | 38 ++++++++++++++++----------------- include/asm-powerpc/spinlock_types.h | 4 +-- 9 files changed, 85 insertions(+), 79 deletions(-) Index: linux-2.6.26/arch/powerpc/Kconfig =================================================================== --- linux-2.6.26.orig/arch/powerpc/Kconfig +++ linux-2.6.26/arch/powerpc/Kconfig @@ -62,13 +62,6 @@ config LOCKDEP_SUPPORT bool default y -config RWSEM_GENERIC_SPINLOCK - bool - -config RWSEM_XCHGADD_ALGORITHM - bool - default y - config GENERIC_LOCKBREAK bool default y @@ -229,6 +222,14 @@ config HIGHMEM source kernel/time/Kconfig source kernel/Kconfig.hz source kernel/Kconfig.preempt + +config RWSEM_GENERIC_SPINLOCK + bool + default y + +config RWSEM_XCHGADD_ALGORITHM + bool + source "fs/Kconfig.binfmt" config HUGETLB_PAGE_SIZE_VARIABLE Index: linux-2.6.26/arch/powerpc/lib/locks.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/lib/locks.c +++ linux-2.6.26/arch/powerpc/lib/locks.c @@ -25,7 +25,7 @@ #include #include -void __spin_yield(raw_spinlock_t *lock) +void __spin_yield(__raw_spinlock_t *lock) { unsigned int lock_value, holder_cpu, yield_count; @@ -82,7 +82,7 @@ void __rw_yield(raw_rwlock_t *rw) } #endif -void __raw_spin_unlock_wait(raw_spinlock_t *lock) +void __raw_spin_unlock_wait(__raw_spinlock_t *lock) { while (lock->slock) { HMT_low(); Index: linux-2.6.26/arch/ppc/Kconfig =================================================================== --- linux-2.6.26.orig/arch/ppc/Kconfig +++ linux-2.6.26/arch/ppc/Kconfig @@ -16,13 +16,6 @@ config GENERIC_HARDIRQS bool default y -config RWSEM_GENERIC_SPINLOCK - bool - -config RWSEM_XCHGADD_ALGORITHM - bool - default y - config ARCH_HAS_ILOG2_U32 bool default y @@ -846,6 +839,18 @@ config ARCH_POPULATES_NODE_MAP source kernel/Kconfig.hz source kernel/Kconfig.preempt + +config RWSEM_GENERIC_SPINLOCK + bool + default y + +config ASM_SEMAPHORES + bool + default y + +config RWSEM_XCHGADD_ALGORITHM + bool + source "mm/Kconfig" source "fs/Kconfig.binfmt" Index: linux-2.6.26/arch/ppc/kernel/entry.S =================================================================== --- linux-2.6.26.orig/arch/ppc/kernel/entry.S +++ linux-2.6.26/arch/ppc/kernel/entry.S @@ -882,7 +882,7 @@ global_dbcr0: #endif /* !(CONFIG_4xx || CONFIG_BOOKE) */ do_work: /* r10 contains MSR_KERNEL here */ - andi. r0,r9,_TIF_NEED_RESCHED + andi. r0,r9,(_TIF_NEED_RESCHED) beq do_user_signal do_resched: /* r10 contains MSR_KERNEL here */ @@ -896,7 +896,7 @@ recheck: MTMSRD(r10) /* disable interrupts */ rlwinm r9,r1,0,0,18 lwz r9,TI_FLAGS(r9) - andi. r0,r9,_TIF_NEED_RESCHED + andi. r0,r9,(_TIF_NEED_RESCHED) bne- do_resched andi. r0,r9,_TIF_SIGPENDING beq restore_user Index: linux-2.6.26/arch/ppc/lib/locks.c =================================================================== --- linux-2.6.26.orig/arch/ppc/lib/locks.c +++ linux-2.6.26/arch/ppc/lib/locks.c @@ -42,7 +42,7 @@ static inline unsigned long __spin_trylo return ret; } -void _raw_spin_lock(spinlock_t *lock) +void __raw_spin_lock(raw_spinlock_t *lock) { int cpu = smp_processor_id(); unsigned int stuck = INIT_STUCK; @@ -62,9 +62,9 @@ void _raw_spin_lock(spinlock_t *lock) lock->owner_pc = (unsigned long)__builtin_return_address(0); lock->owner_cpu = cpu; } -EXPORT_SYMBOL(_raw_spin_lock); +EXPORT_SYMBOL(__raw_spin_lock); -int _raw_spin_trylock(spinlock_t *lock) +int __raw_spin_trylock(raw_spinlock_t *lock) { if (__spin_trylock(&lock->lock)) return 0; @@ -72,9 +72,9 @@ int _raw_spin_trylock(spinlock_t *lock) lock->owner_pc = (unsigned long)__builtin_return_address(0); return 1; } -EXPORT_SYMBOL(_raw_spin_trylock); +EXPORT_SYMBOL(__raw_spin_trylock); -void _raw_spin_unlock(spinlock_t *lp) +void __raw_spin_unlock(raw_spinlock_t *lp) { if ( !lp->lock ) printk("_spin_unlock(%p): no lock cpu %d curr PC %p %s/%d\n", @@ -88,13 +88,13 @@ void _raw_spin_unlock(spinlock_t *lp) wmb(); lp->lock = 0; } -EXPORT_SYMBOL(_raw_spin_unlock); +EXPORT_SYMBOL(__raw_spin_unlock); /* * For rwlocks, zero is unlocked, -1 is write-locked, * positive is read-locked. */ -static __inline__ int __read_trylock(rwlock_t *rw) +static __inline__ int __read_trylock(raw_rwlock_t *rw) { signed int tmp; @@ -114,13 +114,13 @@ static __inline__ int __read_trylock(rwl return tmp; } -int _raw_read_trylock(rwlock_t *rw) +int __raw_read_trylock(raw_rwlock_t *rw) { return __read_trylock(rw) > 0; } -EXPORT_SYMBOL(_raw_read_trylock); +EXPORT_SYMBOL(__raw_read_trylock); -void _raw_read_lock(rwlock_t *rw) +void __raw_read_lock(rwlock_t *rw) { unsigned int stuck; @@ -135,9 +135,9 @@ void _raw_read_lock(rwlock_t *rw) } } } -EXPORT_SYMBOL(_raw_read_lock); +EXPORT_SYMBOL(__raw_read_lock); -void _raw_read_unlock(rwlock_t *rw) +void __raw_read_unlock(raw_rwlock_t *rw) { if ( rw->lock == 0 ) printk("_read_unlock(): %s/%d (nip %08lX) lock %d\n", @@ -146,9 +146,9 @@ void _raw_read_unlock(rwlock_t *rw) wmb(); atomic_dec((atomic_t *) &(rw)->lock); } -EXPORT_SYMBOL(_raw_read_unlock); +EXPORT_SYMBOL(__raw_read_unlock); -void _raw_write_lock(rwlock_t *rw) +void __raw_write_lock(raw_rwlock_t *rw) { unsigned int stuck; @@ -164,18 +164,18 @@ void _raw_write_lock(rwlock_t *rw) } wmb(); } -EXPORT_SYMBOL(_raw_write_lock); +EXPORT_SYMBOL(__raw_write_lock); -int _raw_write_trylock(rwlock_t *rw) +int __raw_write_trylock(raw_rwlock_t *rw) { if (cmpxchg(&rw->lock, 0, -1) != 0) return 0; wmb(); return 1; } -EXPORT_SYMBOL(_raw_write_trylock); +EXPORT_SYMBOL(__raw_write_trylock); -void _raw_write_unlock(rwlock_t *rw) +void __raw_write_unlock(raw_rwlock_t *rw) { if (rw->lock >= 0) printk("_write_lock(): %s/%d (nip %08lX) lock %d\n", @@ -184,6 +184,6 @@ void _raw_write_unlock(rwlock_t *rw) wmb(); rw->lock = 0; } -EXPORT_SYMBOL(_raw_write_unlock); +EXPORT_SYMBOL(__raw_write_unlock); #endif Index: linux-2.6.26/drivers/macintosh/adb.c =================================================================== --- linux-2.6.26.orig/drivers/macintosh/adb.c +++ linux-2.6.26/drivers/macintosh/adb.c @@ -84,7 +84,7 @@ struct adb_driver *adb_controller; BLOCKING_NOTIFIER_HEAD(adb_client_list); static int adb_got_sleep; static int adb_inited; -static DECLARE_MUTEX(adb_probe_mutex); +static COMPAT_DECLARE_MUTEX(adb_probe_mutex); static int sleepy_trackpad; static int autopoll_devs; int __adb_probe_sync; Index: linux-2.6.26/include/asm-powerpc/rwsem.h =================================================================== --- linux-2.6.26.orig/include/asm-powerpc/rwsem.h +++ linux-2.6.26/include/asm-powerpc/rwsem.h @@ -21,7 +21,7 @@ /* * the semaphore definition */ -struct rw_semaphore { +struct compat_rw_semaphore { /* XXX this should be able to be an atomic_t -- paulus */ signed int count; #define RWSEM_UNLOCKED_VALUE 0x00000000 @@ -30,7 +30,7 @@ struct rw_semaphore { #define RWSEM_WAITING_BIAS (-0x00010000) #define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS #define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS) - spinlock_t wait_lock; + raw_spinlock_t wait_lock; struct list_head wait_list; #ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map dep_map; @@ -48,17 +48,17 @@ struct rw_semaphore { LIST_HEAD_INIT((name).wait_list) __RWSEM_DEP_MAP_INIT(name) } #define DECLARE_RWSEM(name) \ - struct rw_semaphore name = __RWSEM_INITIALIZER(name) + struct compat_rw_semaphore name = __RWSEM_INITIALIZER(name) -extern struct rw_semaphore *rwsem_down_read_failed(struct rw_semaphore *sem); -extern struct rw_semaphore *rwsem_down_write_failed(struct rw_semaphore *sem); -extern struct rw_semaphore *rwsem_wake(struct rw_semaphore *sem); -extern struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *sem); +extern struct compat_rw_semaphore *rwsem_down_read_failed(struct compat_rw_semaphore *sem); +extern struct compat_rw_semaphore *rwsem_down_write_failed(struct compat_rw_semaphore *sem); +extern struct compat_rw_semaphore *rwsem_wake(struct compat_rw_semaphore *sem); +extern struct compat_rw_semaphore *rwsem_downgrade_wake(struct compat_rw_semaphore *sem); -extern void __init_rwsem(struct rw_semaphore *sem, const char *name, +extern void __init_rwsem(struct compat_rw_semaphore *sem, const char *name, struct lock_class_key *key); -#define init_rwsem(sem) \ +#define compat_init_rwsem(sem) \ do { \ static struct lock_class_key __key; \ \ @@ -68,13 +68,13 @@ extern void __init_rwsem(struct rw_semap /* * lock for reading */ -static inline void __down_read(struct rw_semaphore *sem) +static inline void __down_read(struct compat_rw_semaphore *sem) { if (unlikely(atomic_inc_return((atomic_t *)(&sem->count)) <= 0)) rwsem_down_read_failed(sem); } -static inline int __down_read_trylock(struct rw_semaphore *sem) +static inline int __down_read_trylock(struct compat_rw_semaphore *sem) { int tmp; @@ -90,7 +90,7 @@ static inline int __down_read_trylock(st /* * lock for writing */ -static inline void __down_write_nested(struct rw_semaphore *sem, int subclass) +static inline void __down_write_nested(struct compat_rw_semaphore *sem, int subclass) { int tmp; @@ -100,12 +100,12 @@ static inline void __down_write_nested(s rwsem_down_write_failed(sem); } -static inline void __down_write(struct rw_semaphore *sem) +static inline void __down_write(struct compat_rw_semaphore *sem) { __down_write_nested(sem, 0); } -static inline int __down_write_trylock(struct rw_semaphore *sem) +static inline int __down_write_trylock(struct compat_rw_semaphore *sem) { int tmp; @@ -117,7 +117,7 @@ static inline int __down_write_trylock(s /* * unlock after reading */ -static inline void __up_read(struct rw_semaphore *sem) +static inline void __up_read(struct compat_rw_semaphore *sem) { int tmp; @@ -129,7 +129,7 @@ static inline void __up_read(struct rw_s /* * unlock after writing */ -static inline void __up_write(struct rw_semaphore *sem) +static inline void __up_write(struct compat_rw_semaphore *sem) { if (unlikely(atomic_sub_return(RWSEM_ACTIVE_WRITE_BIAS, (atomic_t *)(&sem->count)) < 0)) @@ -139,7 +139,7 @@ static inline void __up_write(struct rw_ /* * implement atomic add functionality */ -static inline void rwsem_atomic_add(int delta, struct rw_semaphore *sem) +static inline void rwsem_atomic_add(int delta, struct compat_rw_semaphore *sem) { atomic_add(delta, (atomic_t *)(&sem->count)); } @@ -147,7 +147,7 @@ static inline void rwsem_atomic_add(int /* * downgrade write lock to read lock */ -static inline void __downgrade_write(struct rw_semaphore *sem) +static inline void __downgrade_write(struct compat_rw_semaphore *sem) { int tmp; @@ -159,12 +159,12 @@ static inline void __downgrade_write(str /* * implement exchange and add functionality */ -static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem) +static inline int rwsem_atomic_update(int delta, struct compat_rw_semaphore *sem) { return atomic_add_return(delta, (atomic_t *)(&sem->count)); } -static inline int rwsem_is_locked(struct rw_semaphore *sem) +static inline int compat_rwsem_is_locked(struct compat_rw_semaphore *sem) { return (sem->count != 0); } Index: linux-2.6.26/include/asm-powerpc/spinlock.h =================================================================== --- linux-2.6.26.orig/include/asm-powerpc/spinlock.h +++ linux-2.6.26/include/asm-powerpc/spinlock.h @@ -54,7 +54,7 @@ * This returns the old value in the lock, so we succeeded * in getting the lock if the return value is 0. */ -static __inline__ unsigned long __spin_trylock(raw_spinlock_t *lock) +static __inline__ unsigned long ___raw_spin_trylock(__raw_spinlock_t *lock) { unsigned long tmp, token; @@ -73,10 +73,10 @@ static __inline__ unsigned long __spin_t return tmp; } -static int __inline__ __raw_spin_trylock(raw_spinlock_t *lock) +static int __inline__ __raw_spin_trylock(__raw_spinlock_t *lock) { CLEAR_IO_SYNC; - return __spin_trylock(lock) == 0; + return ___raw_spin_trylock(lock) == 0; } /* @@ -96,19 +96,19 @@ static int __inline__ __raw_spin_trylock #if defined(CONFIG_PPC_SPLPAR) || defined(CONFIG_PPC_ISERIES) /* We only yield to the hypervisor if we are in shared processor mode */ #define SHARED_PROCESSOR (get_lppaca()->shared_proc) -extern void __spin_yield(raw_spinlock_t *lock); -extern void __rw_yield(raw_rwlock_t *lock); +extern void __spin_yield(__raw_spinlock_t *lock); +extern void __rw_yield(__raw_rwlock_t *lock); #else /* SPLPAR || ISERIES */ #define __spin_yield(x) barrier() #define __rw_yield(x) barrier() #define SHARED_PROCESSOR 0 #endif -static void __inline__ __raw_spin_lock(raw_spinlock_t *lock) +static void __inline__ __raw_spin_lock(__raw_spinlock_t *lock) { CLEAR_IO_SYNC; while (1) { - if (likely(__spin_trylock(lock) == 0)) + if (likely(___raw_spin_trylock(lock) == 0)) break; do { HMT_low(); @@ -119,13 +119,13 @@ static void __inline__ __raw_spin_lock(r } } -static void __inline__ __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags) +static void __inline__ __raw_spin_lock_flags(__raw_spinlock_t *lock, unsigned long flags) { unsigned long flags_dis; CLEAR_IO_SYNC; while (1) { - if (likely(__spin_trylock(lock) == 0)) + if (likely(___raw_spin_trylock(lock) == 0)) break; local_save_flags(flags_dis); local_irq_restore(flags); @@ -139,7 +139,7 @@ static void __inline__ __raw_spin_lock_f } } -static __inline__ void __raw_spin_unlock(raw_spinlock_t *lock) +static __inline__ void __raw_spin_unlock(__raw_spinlock_t *lock) { SYNC_IO; __asm__ __volatile__("# __raw_spin_unlock\n\t" @@ -148,7 +148,7 @@ static __inline__ void __raw_spin_unlock } #ifdef CONFIG_PPC64 -extern void __raw_spin_unlock_wait(raw_spinlock_t *lock); +extern void __raw_spin_unlock_wait(__raw_spinlock_t *lock); #else #define __raw_spin_unlock_wait(lock) \ do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0) @@ -180,7 +180,7 @@ extern void __raw_spin_unlock_wait(raw_s * This returns the old value in the lock + 1, * so we got a read lock if the return value is > 0. */ -static long __inline__ __read_trylock(raw_rwlock_t *rw) +static long __inline__ __read_trylock(__raw_rwlock_t *rw) { long tmp; @@ -204,7 +204,7 @@ static long __inline__ __read_trylock(ra * This returns the old value in the lock, * so we got the write lock if the return value is 0. */ -static __inline__ long __write_trylock(raw_rwlock_t *rw) +static __inline__ long __write_trylock(__raw_rwlock_t *rw) { long tmp, token; @@ -224,7 +224,7 @@ static __inline__ long __write_trylock(r return tmp; } -static void __inline__ __raw_read_lock(raw_rwlock_t *rw) +static void __inline__ __raw_read_lock(__raw_rwlock_t *rw) { while (1) { if (likely(__read_trylock(rw) > 0)) @@ -238,7 +238,7 @@ static void __inline__ __raw_read_lock(r } } -static void __inline__ __raw_write_lock(raw_rwlock_t *rw) +static void __inline__ __raw_write_lock(__raw_rwlock_t *rw) { while (1) { if (likely(__write_trylock(rw) == 0)) @@ -252,17 +252,17 @@ static void __inline__ __raw_write_lock( } } -static int __inline__ __raw_read_trylock(raw_rwlock_t *rw) +static int __inline__ __raw_read_trylock(__raw_rwlock_t *rw) { return __read_trylock(rw) > 0; } -static int __inline__ __raw_write_trylock(raw_rwlock_t *rw) +static int __inline__ __raw_write_trylock(__raw_rwlock_t *rw) { return __write_trylock(rw) == 0; } -static void __inline__ __raw_read_unlock(raw_rwlock_t *rw) +static void __inline__ __raw_read_unlock(__raw_rwlock_t *rw) { long tmp; @@ -279,7 +279,7 @@ static void __inline__ __raw_read_unlock : "cr0", "memory"); } -static __inline__ void __raw_write_unlock(raw_rwlock_t *rw) +static __inline__ void __raw_write_unlock(__raw_rwlock_t *rw) { __asm__ __volatile__("# write_unlock\n\t" LWSYNC_ON_SMP: : :"memory"); Index: linux-2.6.26/include/asm-powerpc/spinlock_types.h =================================================================== --- linux-2.6.26.orig/include/asm-powerpc/spinlock_types.h +++ linux-2.6.26/include/asm-powerpc/spinlock_types.h @@ -7,13 +7,13 @@ typedef struct { volatile unsigned int slock; -} raw_spinlock_t; +} __raw_spinlock_t; #define __RAW_SPIN_LOCK_UNLOCKED { 0 } typedef struct { volatile signed int lock; -} raw_rwlock_t; +} __raw_rwlock_t; #define __RAW_RW_LOCK_UNLOCKED { 0 } patches/rt-mutex-ppc-fix-a5.patch0000664000076400007640000000506411043564040015714 0ustar tglxtglx To fix the following compile error by changing names from __{read,write}_trylock to ___raw_{read,write}_trylock in asm-powerpc/spinlock.h - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - include/asm-powerpc/spinlock.h include/linux/spinlock_api_smp.h:49: error: conflicting types for '__read_trylock' include/asm/spinlock.h:183: error: previous definition of '__read_trylock' was here include/linux/spinlock_api_smp.h:50: error: conflicting types for '__write_trylock' include/asm/spinlock.h:207: error: previous definition of '__write_trylock' was here - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Signed-off-by: Tsutomu Owa -- owa --- include/asm-powerpc/spinlock.h | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) Index: linux-2.6.26/include/asm-powerpc/spinlock.h =================================================================== --- linux-2.6.26.orig/include/asm-powerpc/spinlock.h +++ linux-2.6.26/include/asm-powerpc/spinlock.h @@ -180,7 +180,7 @@ extern void __raw_spin_unlock_wait(__raw * This returns the old value in the lock + 1, * so we got a read lock if the return value is > 0. */ -static long __inline__ __read_trylock(__raw_rwlock_t *rw) +static long __inline__ ___raw_read_trylock(__raw_rwlock_t *rw) { long tmp; @@ -204,7 +204,7 @@ static long __inline__ __read_trylock(__ * This returns the old value in the lock, * so we got the write lock if the return value is 0. */ -static __inline__ long __write_trylock(__raw_rwlock_t *rw) +static __inline__ long ___raw_write_trylock(__raw_rwlock_t *rw) { long tmp, token; @@ -227,7 +227,7 @@ static __inline__ long __write_trylock(_ static void __inline__ __raw_read_lock(__raw_rwlock_t *rw) { while (1) { - if (likely(__read_trylock(rw) > 0)) + if (likely(___raw_read_trylock(rw) > 0)) break; do { HMT_low(); @@ -241,7 +241,7 @@ static void __inline__ __raw_read_lock(_ static void __inline__ __raw_write_lock(__raw_rwlock_t *rw) { while (1) { - if (likely(__write_trylock(rw) == 0)) + if (likely(___raw_write_trylock(rw) == 0)) break; do { HMT_low(); @@ -254,12 +254,12 @@ static void __inline__ __raw_write_lock( static int __inline__ __raw_read_trylock(__raw_rwlock_t *rw) { - return __read_trylock(rw) > 0; + return ___raw_read_trylock(rw) > 0; } static int __inline__ __raw_write_trylock(__raw_rwlock_t *rw) { - return __write_trylock(rw) == 0; + return ___raw_write_trylock(rw) == 0; } static void __inline__ __raw_read_unlock(__raw_rwlock_t *rw) patches/rt-mutex-arm.patch0000664000076400007640000000341711043564040014622 0ustar tglxtglx--- arch/arm/kernel/entry-common.S | 12 +++++++----- arch/arm/kernel/process.c | 6 ++++-- 2 files changed, 11 insertions(+), 7 deletions(-) Index: linux-2.6.26/arch/arm/kernel/entry-common.S =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/entry-common.S +++ linux-2.6.26/arch/arm/kernel/entry-common.S @@ -57,7 +57,8 @@ work_pending: b ret_slow_syscall @ Check work again work_resched: - bl schedule + bl __schedule + /* * "slow" syscall return path. "why" tells us if this was a real syscall. */ @@ -452,6 +453,7 @@ ENTRY(sys_oabi_call_table) #include "calls.S" #undef ABI #undef OBSOLETE +#endif #ifdef CONFIG_FRAME_POINTER @@ -501,11 +503,13 @@ mcount: ldr ip, =mcount_enabled @ leave early, if disabled ldr ip, [ip] cmp ip, #0 - moveq pc,lr + moveq pc, lr mov ip, sp stmdb sp!, {r0 - r3, fp, ip, lr, pc} @ create stack frame + mov r2, =mcount_trace_function + ldr r1, [fp, #-4] @ get lr (the return address @ of the caller of the @ instrumented function) @@ -514,7 +518,7 @@ mcount: sub fp, ip, #4 @ point fp at this frame - bl __trace + bl r2 1: ldmdb fp, {r0 - r3, fp, sp, pc} @ pop entry frame and return @@ -560,5 +564,3 @@ arm_return_addr: #endif -#endif - Index: linux-2.6.26/arch/arm/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/process.c +++ linux-2.6.26/arch/arm/kernel/process.c @@ -171,9 +171,11 @@ void cpu_idle(void) idle(); leds_event(led_idle_end); tick_nohz_restart_sched_tick(); - preempt_enable_no_resched(); - schedule(); + local_irq_disable(); + __preempt_enable_no_resched(); + __schedule(); preempt_disable(); + local_irq_enable(); } } patches/rt-mutex-compat-semaphores.patch0000664000076400007640000002170611043564040017473 0ustar tglxtglx drivers/acpi/osl.c | 12 ++++++------ drivers/media/dvb/dvb-core/dvb_frontend.c | 2 +- drivers/net/3c527.c | 2 +- drivers/net/hamradio/6pack.c | 2 +- drivers/net/hamradio/mkiss.c | 2 +- drivers/net/ppp_async.c | 2 +- drivers/pci/hotplug/ibmphp_hpc.c | 2 +- drivers/scsi/aacraid/aacraid.h | 2 +- drivers/usb/storage/usb.h | 2 +- fs/xfs/linux-2.6/sema.h | 9 +++++++-- fs/xfs/linux-2.6/xfs_buf.h | 4 ++-- include/linux/parport.h | 2 +- 12 files changed, 24 insertions(+), 19 deletions(-) Index: linux-2.6.26/drivers/acpi/osl.c =================================================================== --- linux-2.6.26.orig/drivers/acpi/osl.c +++ linux-2.6.26/drivers/acpi/osl.c @@ -768,12 +768,12 @@ void acpi_os_delete_lock(acpi_spinlock h acpi_status acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) { - struct semaphore *sem = NULL; + struct compat_semaphore *sem = NULL; - sem = acpi_os_allocate(sizeof(struct semaphore)); + sem = acpi_os_allocate(sizeof(struct compat_semaphore)); if (!sem) return AE_NO_MEMORY; - memset(sem, 0, sizeof(struct semaphore)); + memset(sem, 0, sizeof(struct compat_semaphore)); sema_init(sem, initial_units); @@ -794,7 +794,7 @@ acpi_os_create_semaphore(u32 max_units, acpi_status acpi_os_delete_semaphore(acpi_handle handle) { - struct semaphore *sem = (struct semaphore *)handle; + struct compat_semaphore *sem = (struct compat_semaphore *)handle; if (!sem) return AE_BAD_PARAMETER; @@ -814,7 +814,7 @@ acpi_status acpi_os_delete_semaphore(acp acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) { acpi_status status = AE_OK; - struct semaphore *sem = (struct semaphore *)handle; + struct compat_semaphore *sem = (struct compat_semaphore *)handle; long jiffies; int ret = 0; @@ -855,7 +855,7 @@ acpi_status acpi_os_wait_semaphore(acpi_ */ acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) { - struct semaphore *sem = (struct semaphore *)handle; + struct compat_semaphore *sem = (struct compat_semaphore *)handle; if (!sem || (units < 1)) return AE_BAD_PARAMETER; Index: linux-2.6.26/drivers/media/dvb/dvb-core/dvb_frontend.c =================================================================== --- linux-2.6.26.orig/drivers/media/dvb/dvb-core/dvb_frontend.c +++ linux-2.6.26/drivers/media/dvb/dvb-core/dvb_frontend.c @@ -97,7 +97,7 @@ struct dvb_frontend_private { struct dvb_device *dvbdev; struct dvb_frontend_parameters parameters; struct dvb_fe_events events; - struct semaphore sem; + struct compat_semaphore sem; struct list_head list_head; wait_queue_head_t wait_queue; struct task_struct *thread; Index: linux-2.6.26/drivers/net/3c527.c =================================================================== --- linux-2.6.26.orig/drivers/net/3c527.c +++ linux-2.6.26/drivers/net/3c527.c @@ -182,7 +182,7 @@ struct mc32_local u16 rx_ring_tail; /* index to rx de-queue end */ - struct semaphore cmd_mutex; /* Serialises issuing of execute commands */ + struct compat_semaphore cmd_mutex; /* Serialises issuing of execute commands */ struct completion execution_cmd; /* Card has completed an execute command */ struct completion xceiver_cmd; /* Card has completed a tx or rx command */ }; Index: linux-2.6.26/drivers/net/hamradio/6pack.c =================================================================== --- linux-2.6.26.orig/drivers/net/hamradio/6pack.c +++ linux-2.6.26/drivers/net/hamradio/6pack.c @@ -123,7 +123,7 @@ struct sixpack { struct timer_list tx_t; struct timer_list resync_t; atomic_t refcnt; - struct semaphore dead_sem; + struct compat_semaphore dead_sem; spinlock_t lock; }; Index: linux-2.6.26/drivers/net/hamradio/mkiss.c =================================================================== --- linux-2.6.26.orig/drivers/net/hamradio/mkiss.c +++ linux-2.6.26/drivers/net/hamradio/mkiss.c @@ -84,7 +84,7 @@ struct mkiss { #define CRC_MODE_SMACK_TEST 4 atomic_t refcnt; - struct semaphore dead_sem; + struct compat_semaphore dead_sem; }; /*---------------------------------------------------------------------------*/ Index: linux-2.6.26/drivers/net/ppp_async.c =================================================================== --- linux-2.6.26.orig/drivers/net/ppp_async.c +++ linux-2.6.26/drivers/net/ppp_async.c @@ -67,7 +67,7 @@ struct asyncppp { struct tasklet_struct tsk; atomic_t refcnt; - struct semaphore dead_sem; + struct compat_semaphore dead_sem; struct ppp_channel chan; /* interface to generic ppp layer */ unsigned char obuf[OBUFSIZE]; }; Index: linux-2.6.26/drivers/pci/hotplug/ibmphp_hpc.c =================================================================== --- linux-2.6.26.orig/drivers/pci/hotplug/ibmphp_hpc.c +++ linux-2.6.26/drivers/pci/hotplug/ibmphp_hpc.c @@ -104,7 +104,7 @@ static int to_debug = 0; static struct mutex sem_hpcaccess; // lock access to HPC static struct semaphore semOperations; // lock all operations and // access to data structures -static struct semaphore sem_exit; // make sure polling thread goes away +static struct compat_semaphore sem_exit; // make sure polling thread goes away static struct task_struct *ibmphp_poll_thread; //---------------------------------------------------------------------------- // local function prototypes Index: linux-2.6.26/drivers/scsi/aacraid/aacraid.h =================================================================== --- linux-2.6.26.orig/drivers/scsi/aacraid/aacraid.h +++ linux-2.6.26/drivers/scsi/aacraid/aacraid.h @@ -719,7 +719,7 @@ struct aac_fib_context { u32 unique; // unique value representing this context ulong jiffies; // used for cleanup - dmb changed to ulong struct list_head next; // used to link context's into a linked list - struct semaphore wait_sem; // this is used to wait for the next fib to arrive. + struct compat_semaphore wait_sem; // this is used to wait for the next fib to arrive. int wait; // Set to true when thread is in WaitForSingleObject unsigned long count; // total number of FIBs on FibList struct list_head fib_list; // this holds fibs and their attachd hw_fibs Index: linux-2.6.26/drivers/usb/storage/usb.h =================================================================== --- linux-2.6.26.orig/drivers/usb/storage/usb.h +++ linux-2.6.26/drivers/usb/storage/usb.h @@ -147,7 +147,7 @@ struct us_data { struct task_struct *ctl_thread; /* the control thread */ /* mutual exclusion and synchronization structures */ - struct semaphore sema; /* to sleep thread on */ + struct compat_semaphore sema; /* to sleep thread on */ struct completion notify; /* thread begin/end */ wait_queue_head_t delay_wait; /* wait during scan, reset */ struct completion scanning_done; /* wait for scan thread */ Index: linux-2.6.26/fs/xfs/linux-2.6/sema.h =================================================================== --- linux-2.6.26.orig/fs/xfs/linux-2.6/sema.h +++ linux-2.6.26/fs/xfs/linux-2.6/sema.h @@ -27,7 +27,7 @@ * sema_t structure just maps to struct semaphore in Linux kernel. */ -typedef struct semaphore sema_t; +typedef struct compat_semaphore sema_t; #define initnsema(sp, val, name) sema_init(sp, val) #define psema(sp, b) down(sp) @@ -36,7 +36,12 @@ typedef struct semaphore sema_t; static inline int issemalocked(sema_t *sp) { - return down_trylock(sp) || (up(sp), 0); + int rv; + + if ((rv = down_trylock(sp))) + return (rv); + up(sp); + return (0); } /* Index: linux-2.6.26/fs/xfs/linux-2.6/xfs_buf.h =================================================================== --- linux-2.6.26.orig/fs/xfs/linux-2.6/xfs_buf.h +++ linux-2.6.26/fs/xfs/linux-2.6/xfs_buf.h @@ -137,7 +137,7 @@ typedef int (*xfs_buf_bdstrat_t)(struct #define XB_PAGES 2 typedef struct xfs_buf { - struct semaphore b_sema; /* semaphore for lockables */ + struct compat_semaphore b_sema; /* semaphore for lockables */ unsigned long b_queuetime; /* time buffer was queued */ atomic_t b_pin_count; /* pin count */ wait_queue_head_t b_waiters; /* unpin waiters */ @@ -157,7 +157,7 @@ typedef struct xfs_buf { xfs_buf_iodone_t b_iodone; /* I/O completion function */ xfs_buf_relse_t b_relse; /* releasing function */ xfs_buf_bdstrat_t b_strat; /* pre-write function */ - struct semaphore b_iodonesema; /* Semaphore for I/O waiters */ + struct compat_semaphore b_iodonesema; /* Semaphore for I/O waiters */ void *b_fspriv; void *b_fspriv2; void *b_fspriv3; Index: linux-2.6.26/include/linux/parport.h =================================================================== --- linux-2.6.26.orig/include/linux/parport.h +++ linux-2.6.26/include/linux/parport.h @@ -266,7 +266,7 @@ enum ieee1284_phase { struct ieee1284_info { int mode; volatile enum ieee1284_phase phase; - struct semaphore irq; + struct compat_semaphore irq; }; /* A parallel port */ patches/percpu-locked-mm.patch0000664000076400007640000002733711043564037015441 0ustar tglxtglx arch/ppc/mm/init.c | 2 - arch/x86/mm/init_32.c | 2 - arch/x86/mm/init_64.c | 2 - include/asm-generic/percpu.h | 18 ++++++++- include/asm-generic/tlb.h | 9 +++- include/linux/percpu.h | 40 ++++++++++++++++++++ mm/swap.c | 85 ++++++++++++++++++++++++++++++++++++------- 7 files changed, 139 insertions(+), 19 deletions(-) Index: linux-2.6.26/arch/ppc/mm/init.c =================================================================== --- linux-2.6.26.orig/arch/ppc/mm/init.c +++ linux-2.6.26/arch/ppc/mm/init.c @@ -55,7 +55,7 @@ #endif #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE -DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); +DEFINE_PER_CPU_LOCKED(struct mmu_gather, mmu_gathers); unsigned long total_memory; unsigned long total_lowmem; Index: linux-2.6.26/arch/x86/mm/init_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/mm/init_32.c +++ linux-2.6.26/arch/x86/mm/init_32.c @@ -52,7 +52,7 @@ unsigned int __VMALLOC_RESERVE = 128 << unsigned long max_pfn_mapped; -DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); +DEFINE_PER_CPU_LOCKED(struct mmu_gather, mmu_gathers); unsigned long highstart_pfn, highend_pfn; static noinline int do_test_wp_bit(void); Index: linux-2.6.26/arch/x86/mm/init_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/mm/init_64.c +++ linux-2.6.26/arch/x86/mm/init_64.c @@ -49,7 +49,7 @@ static unsigned long dma_reserve __initdata; -DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); +DEFINE_PER_CPU_LOCKED(struct mmu_gather, mmu_gathers); int direct_gbpages __meminitdata #ifdef CONFIG_DIRECT_GBPAGES Index: linux-2.6.26/include/asm-generic/percpu.h =================================================================== --- linux-2.6.26.orig/include/asm-generic/percpu.h +++ linux-2.6.26/include/asm-generic/percpu.h @@ -9,6 +9,9 @@ */ #define per_cpu_var(var) per_cpu__##var +#define __per_cpu_var_lock(var) per_cpu_lock__##var##_locked +#define __per_cpu_var_lock_var(var) per_cpu__##var##_locked + #ifdef CONFIG_SMP /* @@ -60,6 +63,14 @@ extern unsigned long __per_cpu_offset[NR #define __raw_get_cpu_var(var) \ (*SHIFT_PERCPU_PTR(&per_cpu_var(var), __my_cpu_offset)) +#define per_cpu_lock(var, cpu) \ + (*SHIFT_PERCPU_PTR(&__per_cpu_var_lock(var), per_cpu_offset(cpu))) +#define per_cpu_var_locked(var, cpu) \ + (*SHIFT_PERCPU_PTR(&__per_cpu_var_lock_var(var), per_cpu_offset(cpu))) +#define __get_cpu_lock(var, cpu) \ + per_cpu_lock(var, cpu) +#define __get_cpu_var_locked(var, cpu) \ + per_cpu_var_locked(var, cpu) #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA extern void setup_per_cpu_areas(void); @@ -68,9 +79,11 @@ extern void setup_per_cpu_areas(void); #else /* ! SMP */ #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu_var(var))) +#define per_cpu_var_locked(var, cpu) (*((void)(cpu), &__per_cpu_var_lock_var(var))) #define __get_cpu_var(var) per_cpu_var(var) #define __raw_get_cpu_var(var) per_cpu_var(var) - +#define __get_cpu_lock(var, cpu) __per_cpu_var_lock(var) +#define __get_cpu_var_locked(var, cpu) __per_cpu_var_lock_var(var) #endif /* SMP */ #ifndef PER_CPU_ATTRIBUTES @@ -79,5 +92,8 @@ extern void setup_per_cpu_areas(void); #define DECLARE_PER_CPU(type, name) extern PER_CPU_ATTRIBUTES \ __typeof__(type) per_cpu_var(name) +#define DECLARE_PER_CPU_LOCKED(type, name) \ + extern PER_CPU_ATTRIBUTES spinlock_t __per_cpu_var_lock(name); \ + extern PER_CPU_ATTRIBUTES __typeof__(type) __per_cpu_var_lock_var(name) #endif /* _ASM_GENERIC_PERCPU_H_ */ Index: linux-2.6.26/include/asm-generic/tlb.h =================================================================== --- linux-2.6.26.orig/include/asm-generic/tlb.h +++ linux-2.6.26/include/asm-generic/tlb.h @@ -41,11 +41,12 @@ struct mmu_gather { unsigned int nr; /* set to ~0U means fast mode */ unsigned int need_flush;/* Really unmapped some ptes? */ unsigned int fullmm; /* non-zero means full mm flush */ + int cpu; struct page * pages[FREE_PTE_NR]; }; /* Users of the generic TLB shootdown code must declare this storage space. */ -DECLARE_PER_CPU(struct mmu_gather, mmu_gathers); +DECLARE_PER_CPU_LOCKED(struct mmu_gather, mmu_gathers); /* tlb_gather_mmu * Return a pointer to an initialized struct mmu_gather. @@ -53,8 +54,10 @@ DECLARE_PER_CPU(struct mmu_gather, mmu_g static inline struct mmu_gather * tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush) { - struct mmu_gather *tlb = &get_cpu_var(mmu_gathers); + int cpu; + struct mmu_gather *tlb = &get_cpu_var_locked(mmu_gathers, &cpu); + tlb->cpu = cpu; tlb->mm = mm; /* Use fast mode if only one CPU is online */ @@ -90,7 +93,7 @@ tlb_finish_mmu(struct mmu_gather *tlb, u /* keep the page table cache within bounds */ check_pgt_cache(); - put_cpu_var(mmu_gathers); + put_cpu_var_locked(mmu_gathers, tlb->cpu); } /* tlb_remove_page Index: linux-2.6.26/include/linux/percpu.h =================================================================== --- linux-2.6.26.orig/include/linux/percpu.h +++ linux-2.6.26/include/linux/percpu.h @@ -23,16 +23,33 @@ __attribute__((__section__(SHARED_ALIGNED_SECTION))) \ PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name \ ____cacheline_aligned_in_smp + +#define DEFINE_PER_CPU_LOCKED(type, name) \ + __attribute__((__section__(".data.percpu"))) \ + PER_CPU_ATTRIBUTES __DEFINE_SPINLOCK(per_cpu_lock__##name##_locked); \ + __attribute__((__section__(".data.percpu"))) \ + PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name##_locked + #else #define DEFINE_PER_CPU(type, name) \ PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ DEFINE_PER_CPU(type, name) + +#define DEFINE_PER_CPU_LOCKED(type, name) \ + PER_CPU_ATTRIBUTES __DEFINE_SPINLOCK(per_cpu_lock__##name##_locked); \ + PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name##_locked #endif #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) +#define EXPORT_PER_CPU_LOCKED_SYMBOL(var) \ + EXPORT_SYMBOL(per_cpu_lock__##var##_locked); \ + EXPORT_SYMBOL(per_cpu__##var##_locked) +#define EXPORT_PER_CPU_LOCKED_SYMBOL_GPL(var) \ + EXPORT_SYMBOL_GPL(per_cpu_lock__##var##_locked); \ + EXPORT_SYMBOL_GPL(per_cpu__##var##_locked) /* Enough to cover all DEFINE_PER_CPUs in kernel, including modules. */ #ifndef PERCPU_ENOUGH_ROOM @@ -56,6 +73,29 @@ &__get_cpu_var(var); })) #define put_cpu_var(var) preempt_enable() +/* + * Per-CPU data structures with an additional lock - useful for + * PREEMPT_RT code that wants to reschedule but also wants + * per-CPU data structures. + * + * 'cpu' gets updated with the CPU the task is currently executing on. + * + * NOTE: on normal !PREEMPT_RT kernels these per-CPU variables + * are the same as the normal per-CPU variables, so there no + * runtime overhead. + */ +#define get_cpu_var_locked(var, cpuptr) \ +(*({ \ + int __cpu = raw_smp_processor_id(); \ + \ + *(cpuptr) = __cpu; \ + spin_lock(&__get_cpu_lock(var, __cpu)); \ + &__get_cpu_var_locked(var, __cpu); \ +})) + +#define put_cpu_var_locked(var, cpu) \ + do { (void)cpu; spin_unlock(&__get_cpu_lock(var, cpu)); } while (0) + #ifdef CONFIG_SMP struct percpu_data { Index: linux-2.6.26/mm/swap.c =================================================================== --- linux-2.6.26.orig/mm/swap.c +++ linux-2.6.26/mm/swap.c @@ -34,10 +34,64 @@ /* How many pages do we try to swap or page in/out together? */ int page_cluster; +/* + * On PREEMPT_RT we don't want to disable preemption for cpu variables. + * We grab a cpu and then use that cpu to lock the variables accordingly. + */ +#ifdef CONFIG_PREEMPT_RT +static DEFINE_PER_CPU_LOCKED(struct pagevec, lru_add_pvecs) = { 0, }; +static DEFINE_PER_CPU_LOCKED(struct pagevec, lru_add_active_pvecs) = { 0, }; +static DEFINE_PER_CPU_LOCKED(struct pagevec, lru_rotate_pvecs) = { 0, }; + +#define swap_get_cpu_var_irq_save(var, flags, cpu) \ + ({ \ + (void)flags; \ + &get_cpu_var_locked(var, &cpu); \ + }) +#define swap_put_cpu_var_irq_restore(var, flags, cpu) \ + put_cpu_var_locked(var, cpu) +#define swap_get_cpu_var(var, cpu) \ + &get_cpu_var_locked(var, &cpu) +#define swap_put_cpu_var(var, cpu) \ + put_cpu_var_locked(var, cpu) +#define swap_per_cpu_lock(var, cpu) \ + ({ \ + spin_lock(&__get_cpu_lock(var, cpu)); \ + &__get_cpu_var_locked(var, cpu); \ + }) +#define swap_per_cpu_unlock(var, cpu) \ + spin_unlock(&__get_cpu_lock(var, cpu)); +#define swap_get_cpu() raw_smp_processor_id(); +#define swap_put_cpu() +#else static DEFINE_PER_CPU(struct pagevec, lru_add_pvecs) = { 0, }; static DEFINE_PER_CPU(struct pagevec, lru_add_active_pvecs) = { 0, }; static DEFINE_PER_CPU(struct pagevec, lru_rotate_pvecs) = { 0, }; +#define swap_get_cpu_var_irq_save(var, flags, cpu) \ + ({ \ + (void)cpu; \ + local_irq_save(flags); \ + &__get_cpu_var(var); \ + }) +#define swap_put_cpu_var_irq_restore(var, flags, cpu) \ + local_irq_restore(flags) +#define swap_get_cpu_var(var, cpu) \ + ({ (void)cpu; &get_cpu_var(var); }) +#define swap_put_cpu_var(var, cpu) \ + do { \ + (void)cpu; \ + put_cpu_var(var); \ + } while(0) +#define swap_per_cpu_lock(var, cpu) \ + &per_cpu(lru_add_pvecs, cpu) +#define swap_per_cpu_unlock(var, cpu) \ + do { } while(0) +#define swap_get_cpu() get_cpu() +#define swap_put_cpu() put_cpu(); + +#endif /* CONFIG_PREEMPT_RT */ + /* * This path almost never happens for VM activity - pages are normally * freed via pagevecs. But it gets used by networking. @@ -139,13 +193,13 @@ void rotate_reclaimable_page(struct pag PageLRU(page)) { struct pagevec *pvec; unsigned long flags; + int cpu; page_cache_get(page); - local_irq_save(flags); - pvec = &__get_cpu_var(lru_rotate_pvecs); + pvec = swap_get_cpu_var_irq_save(lru_rotate_pvecs, flags, cpu); if (!pagevec_add(pvec, page)) pagevec_move_tail(pvec); - local_irq_restore(flags); + swap_put_cpu_var_irq_restore(lru_rotate_pvecs, flags, cpu); } } @@ -192,22 +246,24 @@ EXPORT_SYMBOL(mark_page_accessed); */ void lru_cache_add(struct page *page) { - struct pagevec *pvec = &get_cpu_var(lru_add_pvecs); + int cpu; + struct pagevec *pvec = swap_get_cpu_var(lru_add_pvecs, cpu); page_cache_get(page); if (!pagevec_add(pvec, page)) __pagevec_lru_add(pvec); - put_cpu_var(lru_add_pvecs); + swap_put_cpu_var(lru_add_pvecs, cpu); } void lru_cache_add_active(struct page *page) { - struct pagevec *pvec = &get_cpu_var(lru_add_active_pvecs); + int cpu; + struct pagevec *pvec = swap_get_cpu_var(lru_add_active_pvecs, cpu); page_cache_get(page); if (!pagevec_add(pvec, page)) __pagevec_lru_add_active(pvec); - put_cpu_var(lru_add_active_pvecs); + swap_put_cpu_var(lru_add_active_pvecs, cpu); } /* @@ -219,15 +275,17 @@ static void drain_cpu_pagevecs(int cpu) { struct pagevec *pvec; - pvec = &per_cpu(lru_add_pvecs, cpu); + pvec = swap_per_cpu_lock(lru_add_pvecs, cpu); if (pagevec_count(pvec)) __pagevec_lru_add(pvec); + swap_per_cpu_unlock(lru_add_pvecs, cpu); - pvec = &per_cpu(lru_add_active_pvecs, cpu); + pvec = swap_per_cpu_lock(lru_add_active_pvecs, cpu); if (pagevec_count(pvec)) __pagevec_lru_add_active(pvec); + swap_per_cpu_unlock(lru_add_active_pvecs, cpu); - pvec = &per_cpu(lru_rotate_pvecs, cpu); + pvec = swap_per_cpu_lock(lru_rotate_pvecs, cpu); if (pagevec_count(pvec)) { unsigned long flags; @@ -236,12 +294,15 @@ static void drain_cpu_pagevecs(int cpu) pagevec_move_tail(pvec); local_irq_restore(flags); } + swap_per_cpu_unlock(lru_rotate_pvecs, cpu); } void lru_add_drain(void) { - drain_cpu_pagevecs(get_cpu()); - put_cpu(); + int cpu; + cpu = swap_get_cpu(); + drain_cpu_pagevecs(cpu); + swap_put_cpu(); } #ifdef CONFIG_NUMA patches/percpu-locked-netfilter.patch0000664000076400007640000001027011043564037017010 0ustar tglxtglx net/core/flow.c | 22 ++++++++++++++-------- net/ipv4/netfilter/arp_tables.c | 4 ++-- net/ipv4/netfilter/ip_tables.c | 2 +- 3 files changed, 17 insertions(+), 11 deletions(-) --- Index: linux-2.6.26/net/core/flow.c =================================================================== --- linux-2.6.26.orig/net/core/flow.c +++ linux-2.6.26/net/core/flow.c @@ -39,9 +39,10 @@ atomic_t flow_cache_genid = ATOMIC_INIT( static u32 flow_hash_shift; #define flow_hash_size (1 << flow_hash_shift) -static DEFINE_PER_CPU(struct flow_cache_entry **, flow_tables) = { NULL }; -#define flow_table(cpu) (per_cpu(flow_tables, cpu)) +static DEFINE_PER_CPU_LOCKED(struct flow_cache_entry **, flow_tables); + +#define flow_table(cpu) (per_cpu_var_locked(flow_tables, cpu)) static struct kmem_cache *flow_cachep __read_mostly; @@ -168,24 +169,24 @@ static int flow_key_compare(struct flowi void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir, flow_resolve_t resolver) { - struct flow_cache_entry *fle, **head = NULL /* shut up GCC */; + struct flow_cache_entry **table, *fle, **head = NULL /* shut up GCC */; unsigned int hash; int cpu; local_bh_disable(); - cpu = smp_processor_id(); + table = get_cpu_var_locked(flow_tables, &cpu); fle = NULL; /* Packet really early in init? Making flow_cache_init a * pre-smp initcall would solve this. --RR */ - if (!flow_table(cpu)) + if (!table) goto nocache; if (flow_hash_rnd_recalc(cpu)) flow_new_hash_rnd(cpu); hash = flow_hash_code(key, cpu); - head = &flow_table(cpu)[hash]; + head = &table[hash]; for (fle = *head; fle; fle = fle->next) { if (fle->family == family && fle->dir == dir && @@ -195,6 +196,7 @@ void *flow_cache_lookup(struct flowi *ke if (ret) atomic_inc(fle->object_ref); + put_cpu_var_locked(flow_tables, cpu); local_bh_enable(); return ret; @@ -220,6 +222,8 @@ void *flow_cache_lookup(struct flowi *ke } nocache: + put_cpu_var_locked(flow_tables, cpu); + { int err; void *obj; @@ -249,14 +253,15 @@ nocache: static void flow_cache_flush_tasklet(unsigned long data) { struct flow_flush_info *info = (void *)data; + struct flow_cache_entry **table; int i; int cpu; - cpu = smp_processor_id(); + table = get_cpu_var_locked(flow_tables, &cpu); for (i = 0; i < flow_hash_size; i++) { struct flow_cache_entry *fle; - fle = flow_table(cpu)[i]; + fle = table[i]; for (; fle; fle = fle->next) { unsigned genid = atomic_read(&flow_cache_genid); @@ -267,6 +272,7 @@ static void flow_cache_flush_tasklet(uns atomic_dec(fle->object_ref); } } + put_cpu_var_locked(flow_tables, cpu); if (atomic_dec_and_test(&info->cpuleft)) complete(&info->completion); Index: linux-2.6.26/net/ipv4/netfilter/arp_tables.c =================================================================== --- linux-2.6.26.orig/net/ipv4/netfilter/arp_tables.c +++ linux-2.6.26/net/ipv4/netfilter/arp_tables.c @@ -241,7 +241,7 @@ unsigned int arpt_do_table(struct sk_buf read_lock_bh(&table->lock); private = table->private; - table_base = (void *)private->entries[smp_processor_id()]; + table_base = (void *)private->entries[raw_smp_processor_id()]; e = get_entry(table_base, private->hook_entry[hook]); back = get_entry(table_base, private->underflow[hook]); @@ -1149,7 +1149,7 @@ static int do_add_counters(struct net *n i = 0; /* Choose the copy that is on our node */ - loc_cpu_entry = private->entries[smp_processor_id()]; + loc_cpu_entry = private->entries[raw_smp_processor_id()]; ARPT_ENTRY_ITERATE(loc_cpu_entry, private->size, add_counter_to_entry, Index: linux-2.6.26/net/ipv4/netfilter/ip_tables.c =================================================================== --- linux-2.6.26.orig/net/ipv4/netfilter/ip_tables.c +++ linux-2.6.26/net/ipv4/netfilter/ip_tables.c @@ -353,7 +353,7 @@ ipt_do_table(struct sk_buff *skb, read_lock_bh(&table->lock); IP_NF_ASSERT(table->valid_hooks & (1 << hook)); private = table->private; - table_base = (void *)private->entries[smp_processor_id()]; + table_base = (void *)private->entries[raw_smp_processor_id()]; e = get_entry(table_base, private->hook_entry[hook]); /* For return from builtin chain */ patches/percpu-locked-netfilter2.patch0000664000076400007640000001041511043564037017073 0ustar tglxtglx--- include/net/netfilter/nf_conntrack.h | 2 +- include/net/netfilter/nf_conntrack_ecache.h | 13 +++++++------ net/netfilter/nf_conntrack_ecache.c | 16 ++++++++-------- 3 files changed, 16 insertions(+), 15 deletions(-) Index: linux-2.6.26/include/net/netfilter/nf_conntrack.h =================================================================== --- linux-2.6.26.orig/include/net/netfilter/nf_conntrack.h +++ linux-2.6.26/include/net/netfilter/nf_conntrack.h @@ -264,7 +264,7 @@ extern atomic_t nf_conntrack_count; extern int nf_conntrack_max; DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat); -#define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++) +#define NF_CT_STAT_INC(count) (__raw_get_cpu_var(nf_conntrack_stat).count++) #define NF_CT_STAT_INC_ATOMIC(count) \ do { \ local_bh_disable(); \ Index: linux-2.6.26/include/net/netfilter/nf_conntrack_ecache.h =================================================================== --- linux-2.6.26.orig/include/net/netfilter/nf_conntrack_ecache.h +++ linux-2.6.26/include/net/netfilter/nf_conntrack_ecache.h @@ -15,16 +15,15 @@ struct nf_conntrack_ecache { struct nf_conn *ct; unsigned int events; }; -DECLARE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache); - -#define CONNTRACK_ECACHE(x) (__get_cpu_var(nf_conntrack_ecache).x) +DECLARE_PER_CPU_LOCKED(struct nf_conntrack_ecache, nf_conntrack_ecache); extern struct atomic_notifier_head nf_conntrack_chain; extern int nf_conntrack_register_notifier(struct notifier_block *nb); extern int nf_conntrack_unregister_notifier(struct notifier_block *nb); extern void nf_ct_deliver_cached_events(const struct nf_conn *ct); -extern void __nf_ct_event_cache_init(struct nf_conn *ct); +extern void __nf_ct_event_cache_init(struct nf_conntrack_ecache *ecache, + struct nf_conn *ct); extern void nf_ct_event_cache_flush(void); static inline void @@ -33,12 +32,14 @@ nf_conntrack_event_cache(enum ip_conntra { struct nf_conn *ct = (struct nf_conn *)skb->nfct; struct nf_conntrack_ecache *ecache; + int cpu; local_bh_disable(); - ecache = &__get_cpu_var(nf_conntrack_ecache); + ecache = &get_cpu_var_locked(nf_conntrack_ecache, &cpu); if (ct != ecache->ct) - __nf_ct_event_cache_init(ct); + __nf_ct_event_cache_init(ecache, ct); ecache->events |= event; + put_cpu_var_locked(nf_conntrack_ecache, cpu); local_bh_enable(); } Index: linux-2.6.26/net/netfilter/nf_conntrack_ecache.c =================================================================== --- linux-2.6.26.orig/net/netfilter/nf_conntrack_ecache.c +++ linux-2.6.26/net/netfilter/nf_conntrack_ecache.c @@ -29,8 +29,8 @@ EXPORT_SYMBOL_GPL(nf_conntrack_chain); ATOMIC_NOTIFIER_HEAD(nf_ct_expect_chain); EXPORT_SYMBOL_GPL(nf_ct_expect_chain); -DEFINE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache); -EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache); +DEFINE_PER_CPU_LOCKED(struct nf_conntrack_ecache, nf_conntrack_ecache); +EXPORT_PER_CPU_LOCKED_SYMBOL_GPL(nf_conntrack_ecache); /* deliver cached events and clear cache entry - must be called with locally * disabled softirqs */ @@ -52,22 +52,22 @@ __nf_ct_deliver_cached_events(struct nf_ void nf_ct_deliver_cached_events(const struct nf_conn *ct) { struct nf_conntrack_ecache *ecache; + int cpu; local_bh_disable(); - ecache = &__get_cpu_var(nf_conntrack_ecache); + ecache = &get_cpu_var_locked(nf_conntrack_ecache, &cpu); if (ecache->ct == ct) __nf_ct_deliver_cached_events(ecache); + put_cpu_var_locked(nf_conntrack_ecache, cpu); local_bh_enable(); } EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events); /* Deliver cached events for old pending events, if current conntrack != old */ -void __nf_ct_event_cache_init(struct nf_conn *ct) +void +__nf_ct_event_cache_init(struct nf_conntrack_ecache *ecache, struct nf_conn *ct) { - struct nf_conntrack_ecache *ecache; - /* take care of delivering potentially old events */ - ecache = &__get_cpu_var(nf_conntrack_ecache); BUG_ON(ecache->ct == ct); if (ecache->ct) __nf_ct_deliver_cached_events(ecache); @@ -85,7 +85,7 @@ void nf_ct_event_cache_flush(void) int cpu; for_each_possible_cpu(cpu) { - ecache = &per_cpu(nf_conntrack_ecache, cpu); + ecache = &__get_cpu_var_locked(nf_conntrack_ecache, cpu); if (ecache->ct) nf_ct_put(ecache->ct); } patches/percpu-locked-powerpc-fixups.patch0000664000076400007640000000217711043564037020016 0ustar tglxtglx--- arch/powerpc/mm/init_32.c | 2 +- arch/powerpc/mm/tlb_64.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6.26/arch/powerpc/mm/init_32.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/mm/init_32.c +++ linux-2.6.26/arch/powerpc/mm/init_32.c @@ -54,7 +54,7 @@ #endif #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE -DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); +DEFINE_PER_CPU_LOCKED(struct mmu_gather, mmu_gathers); unsigned long total_memory; unsigned long total_lowmem; Index: linux-2.6.26/arch/powerpc/mm/tlb_64.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/mm/tlb_64.c +++ linux-2.6.26/arch/powerpc/mm/tlb_64.c @@ -36,7 +36,7 @@ DEFINE_PER_CPU(struct ppc64_tlb_batch, p /* This is declared as we are using the more or less generic * include/asm-powerpc/tlb.h file -- tgall */ -DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); +DEFINE_PER_CPU_LOCKED(struct mmu_gather, mmu_gathers); DEFINE_PER_CPU(struct pte_freelist_batch *, pte_freelist_cur); unsigned long pte_freelist_forced_free; patches/net-core-preempt-fix.patch0000664000076400007640000000071211043564037016233 0ustar tglxtglx--- net/core/dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/net/core/dev.c =================================================================== --- linux-2.6.26.orig/net/core/dev.c +++ linux-2.6.26/net/core/dev.c @@ -1831,8 +1831,8 @@ int netif_rx_ni(struct sk_buff *skb) { int err; - preempt_disable(); err = netif_rx(skb); + preempt_disable(); if (local_softirq_pending()) do_softirq(); preempt_enable(); patches/bh-uptodate-lock.patch0000664000076400007640000001103211043564036015417 0ustar tglxtglx fs/buffer.c | 20 ++++++++------------ fs/ntfs/aops.c | 9 +++------ include/linux/buffer_head.h | 5 +---- 3 files changed, 12 insertions(+), 22 deletions(-) Index: linux-2.6.26/fs/buffer.c =================================================================== --- linux-2.6.26.orig/fs/buffer.c +++ linux-2.6.26/fs/buffer.c @@ -406,8 +406,7 @@ static void end_buffer_async_read(struct * decide that the page is now completely done. */ first = page_buffers(page); - local_irq_save(flags); - bit_spin_lock(BH_Uptodate_Lock, &first->b_state); + spin_lock_irqsave(&first->b_uptodate_lock, flags); clear_buffer_async_read(bh); unlock_buffer(bh); tmp = bh; @@ -420,8 +419,7 @@ static void end_buffer_async_read(struct } tmp = tmp->b_this_page; } while (tmp != bh); - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); - local_irq_restore(flags); + spin_unlock_irqrestore(&first->b_uptodate_lock, flags); /* * If none of the buffers had errors and they are all @@ -433,8 +431,7 @@ static void end_buffer_async_read(struct return; still_busy: - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); - local_irq_restore(flags); + spin_unlock_irqrestore(&first->b_uptodate_lock, flags); return; } @@ -469,8 +466,7 @@ static void end_buffer_async_write(struc } first = page_buffers(page); - local_irq_save(flags); - bit_spin_lock(BH_Uptodate_Lock, &first->b_state); + spin_lock_irqsave(&first->b_uptodate_lock, flags); clear_buffer_async_write(bh); unlock_buffer(bh); @@ -482,14 +478,12 @@ static void end_buffer_async_write(struc } tmp = tmp->b_this_page; } - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); - local_irq_restore(flags); + spin_unlock_irqrestore(&first->b_uptodate_lock, flags); end_page_writeback(page); return; still_busy: - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); - local_irq_restore(flags); + spin_unlock_irqrestore(&first->b_uptodate_lock, flags); return; } @@ -3174,6 +3168,7 @@ struct buffer_head *alloc_buffer_head(gf struct buffer_head *ret = kmem_cache_alloc(bh_cachep, gfp_flags); if (ret) { INIT_LIST_HEAD(&ret->b_assoc_buffers); + spin_lock_init(&ret->b_uptodate_lock); get_cpu_var(bh_accounting).nr++; recalc_bh_state(); put_cpu_var(bh_accounting); @@ -3185,6 +3180,7 @@ EXPORT_SYMBOL(alloc_buffer_head); void free_buffer_head(struct buffer_head *bh) { BUG_ON(!list_empty(&bh->b_assoc_buffers)); + BUG_ON(spin_is_locked(&bh->b_uptodate_lock)); kmem_cache_free(bh_cachep, bh); get_cpu_var(bh_accounting).nr--; recalc_bh_state(); Index: linux-2.6.26/fs/ntfs/aops.c =================================================================== --- linux-2.6.26.orig/fs/ntfs/aops.c +++ linux-2.6.26/fs/ntfs/aops.c @@ -107,8 +107,7 @@ static void ntfs_end_buffer_async_read(s "0x%llx.", (unsigned long long)bh->b_blocknr); } first = page_buffers(page); - local_irq_save(flags); - bit_spin_lock(BH_Uptodate_Lock, &first->b_state); + spin_lock_irqsave(&first->b_uptodate_lock, flags); clear_buffer_async_read(bh); unlock_buffer(bh); tmp = bh; @@ -123,8 +122,7 @@ static void ntfs_end_buffer_async_read(s } tmp = tmp->b_this_page; } while (tmp != bh); - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); - local_irq_restore(flags); + spin_unlock_irqrestore(&first->b_uptodate_lock, flags); /* * If none of the buffers had errors then we can set the page uptodate, * but we first have to perform the post read mst fixups, if the @@ -159,8 +157,7 @@ static void ntfs_end_buffer_async_read(s unlock_page(page); return; still_busy: - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); - local_irq_restore(flags); + spin_unlock_irqrestore(&first->b_uptodate_lock, flags); return; } Index: linux-2.6.26/include/linux/buffer_head.h =================================================================== --- linux-2.6.26.orig/include/linux/buffer_head.h +++ linux-2.6.26/include/linux/buffer_head.h @@ -21,10 +21,6 @@ enum bh_state_bits { BH_Dirty, /* Is dirty */ BH_Lock, /* Is locked */ BH_Req, /* Has been submitted for I/O */ - BH_Uptodate_Lock,/* Used by the first bh in a page, to serialise - * IO completion of other buffers in the page - */ - BH_Mapped, /* Has a disk mapping */ BH_New, /* Disk mapping was newly created by get_block */ BH_Async_Read, /* Is under end_buffer_async_read I/O */ @@ -73,6 +69,7 @@ struct buffer_head { struct address_space *b_assoc_map; /* mapping this buffer is associated with */ atomic_t b_count; /* users using this buffer_head */ + spinlock_t b_uptodate_lock; }; /* patches/bh-state-lock.patch0000664000076400007640000000600411043564036014715 0ustar tglxtglx I was compiling a kernel in a shell that I set to a priority of 20, and it locked up on the bit_spin_lock crap of jbd. This patch adds another spinlock to the buffer head and uses that instead of the bit_spins. From: Steven Rostedt Signed-off-by: Ingo Molnar -- fs/buffer.c | 3 ++- include/linux/buffer_head.h | 1 + include/linux/jbd.h | 12 ++++++------ 3 files changed, 9 insertions(+), 7 deletions(-) Index: linux-2.6.26/fs/buffer.c =================================================================== --- linux-2.6.26.orig/fs/buffer.c +++ linux-2.6.26/fs/buffer.c @@ -40,7 +40,6 @@ #include #include #include -#include static int fsync_buffers_list(spinlock_t *lock, struct list_head *list); @@ -3169,6 +3168,7 @@ struct buffer_head *alloc_buffer_head(gf if (ret) { INIT_LIST_HEAD(&ret->b_assoc_buffers); spin_lock_init(&ret->b_uptodate_lock); + spin_lock_init(&ret->b_state_lock); get_cpu_var(bh_accounting).nr++; recalc_bh_state(); put_cpu_var(bh_accounting); @@ -3181,6 +3181,7 @@ void free_buffer_head(struct buffer_head { BUG_ON(!list_empty(&bh->b_assoc_buffers)); BUG_ON(spin_is_locked(&bh->b_uptodate_lock)); + BUG_ON(spin_is_locked(&bh->b_state_lock)); kmem_cache_free(bh_cachep, bh); get_cpu_var(bh_accounting).nr--; recalc_bh_state(); Index: linux-2.6.26/include/linux/buffer_head.h =================================================================== --- linux-2.6.26.orig/include/linux/buffer_head.h +++ linux-2.6.26/include/linux/buffer_head.h @@ -70,6 +70,7 @@ struct buffer_head { associated with */ atomic_t b_count; /* users using this buffer_head */ spinlock_t b_uptodate_lock; + spinlock_t b_state_lock; }; /* Index: linux-2.6.26/include/linux/jbd.h =================================================================== --- linux-2.6.26.orig/include/linux/jbd.h +++ linux-2.6.26/include/linux/jbd.h @@ -315,32 +315,32 @@ static inline struct journal_head *bh2jh static inline void jbd_lock_bh_state(struct buffer_head *bh) { - bit_spin_lock(BH_State, &bh->b_state); + spin_lock(&bh->b_state_lock); } static inline int jbd_trylock_bh_state(struct buffer_head *bh) { - return bit_spin_trylock(BH_State, &bh->b_state); + return spin_trylock(&bh->b_state_lock); } static inline int jbd_is_locked_bh_state(struct buffer_head *bh) { - return bit_spin_is_locked(BH_State, &bh->b_state); + return spin_is_locked(&bh->b_state_lock); } static inline void jbd_unlock_bh_state(struct buffer_head *bh) { - bit_spin_unlock(BH_State, &bh->b_state); + spin_unlock(&bh->b_state_lock); } static inline void jbd_lock_bh_journal_head(struct buffer_head *bh) { - bit_spin_lock(BH_JournalHead, &bh->b_state); + spin_lock_irq(&bh->b_uptodate_lock); } static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh) { - bit_spin_unlock(BH_JournalHead, &bh->b_state); + spin_unlock_irq(&bh->b_uptodate_lock); } struct jbd_revoke_table_s; patches/jbd_assertions_smp_only.patch0000664000076400007640000000367311043564036017222 0ustar tglxtglx fs/jbd/transaction.c | 6 +++--- include/linux/jbd.h | 9 +++++++++ 2 files changed, 12 insertions(+), 3 deletions(-) Index: linux-2.6.26/fs/jbd/transaction.c =================================================================== --- linux-2.6.26.orig/fs/jbd/transaction.c +++ linux-2.6.26/fs/jbd/transaction.c @@ -1546,7 +1546,7 @@ static void __journal_temp_unlink_buffer transaction_t *transaction; struct buffer_head *bh = jh2bh(jh); - J_ASSERT_JH(jh, jbd_is_locked_bh_state(bh)); + J_ASSERT_JH_SMP(jh, jbd_is_locked_bh_state(bh)); transaction = jh->b_transaction; if (transaction) assert_spin_locked(&transaction->t_journal->j_list_lock); @@ -1988,7 +1988,7 @@ void __journal_file_buffer(struct journa int was_dirty = 0; struct buffer_head *bh = jh2bh(jh); - J_ASSERT_JH(jh, jbd_is_locked_bh_state(bh)); + J_ASSERT_JH_SMP(jh, jbd_is_locked_bh_state(bh)); assert_spin_locked(&transaction->t_journal->j_list_lock); J_ASSERT_JH(jh, jh->b_jlist < BJ_Types); @@ -2077,7 +2077,7 @@ void __journal_refile_buffer(struct jour int was_dirty; struct buffer_head *bh = jh2bh(jh); - J_ASSERT_JH(jh, jbd_is_locked_bh_state(bh)); + J_ASSERT_JH_SMP(jh, jbd_is_locked_bh_state(bh)); if (jh->b_transaction) assert_spin_locked(&jh->b_transaction->t_journal->j_list_lock); Index: linux-2.6.26/include/linux/jbd.h =================================================================== --- linux-2.6.26.orig/include/linux/jbd.h +++ linux-2.6.26/include/linux/jbd.h @@ -260,6 +260,15 @@ void buffer_assertion_failure(struct buf #define J_ASSERT_JH(jh, expr) J_ASSERT(expr) #endif +/* + * For assertions that are only valid on SMP (e.g. spin_is_locked()): + */ +#ifdef CONFIG_SMP +# define J_ASSERT_JH_SMP(jh, expr) J_ASSERT_JH(jh, expr) +#else +# define J_ASSERT_JH_SMP(jh, assert) do { } while (0) +#endif + #if defined(JBD_PARANOID_IOFAIL) #define J_EXPECT(expr, why...) J_ASSERT(expr) #define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr) patches/tasklet-redesign.patch0000664000076400007640000002244111043564036015530 0ustar tglxtglxFrom: Ingo Molnar tasklet redesign: make it saner and make it easier to thread. Signed-off-by: Ingo Molnar ---- include/linux/interrupt.h | 33 ++++---- kernel/softirq.c | 184 ++++++++++++++++++++++++++++++++-------------- 2 files changed, 149 insertions(+), 68 deletions(-) Index: linux-2.6.26/include/linux/interrupt.h =================================================================== --- linux-2.6.26.orig/include/linux/interrupt.h +++ linux-2.6.26/include/linux/interrupt.h @@ -328,8 +328,9 @@ extern void wait_for_softirq(int softirq to be executed on some cpu at least once after this. * If the tasklet is already scheduled, but its excecution is still not started, it will be executed only once. - * If this tasklet is already running on another CPU (or schedule is called - from tasklet itself), it is rescheduled for later. + * If this tasklet is already running on another CPU, it is rescheduled + for later. + * Schedule must not be called from the tasklet itself (a lockup occurs) * Tasklet is strictly serialized wrt itself, but not wrt another tasklets. If client needs some intertask synchronization, he makes it with spinlocks. @@ -354,15 +355,25 @@ struct tasklet_struct name = { NULL, 0, enum { TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ - TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ + TASKLET_STATE_RUN, /* Tasklet is running (SMP only) */ + TASKLET_STATE_PENDING /* Tasklet is pending */ }; -#ifdef CONFIG_SMP +#define TASKLET_STATEF_SCHED (1 << TASKLET_STATE_SCHED) +#define TASKLET_STATEF_RUN (1 << TASKLET_STATE_RUN) +#define TASKLET_STATEF_PENDING (1 << TASKLET_STATE_PENDING) + +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT) static inline int tasklet_trylock(struct tasklet_struct *t) { return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); } +static inline int tasklet_tryunlock(struct tasklet_struct *t) +{ + return cmpxchg(&t->state, TASKLET_STATEF_RUN, 0) == TASKLET_STATEF_RUN; +} + static inline void tasklet_unlock(struct tasklet_struct *t) { smp_mb__before_clear_bit(); @@ -375,6 +386,7 @@ static inline void tasklet_unlock_wait(s } #else #define tasklet_trylock(t) 1 +#define tasklet_tryunlock(t) 1 #define tasklet_unlock_wait(t) do { } while (0) #define tasklet_unlock(t) do { } while (0) #endif @@ -409,17 +421,8 @@ static inline void tasklet_disable(struc smp_mb(); } -static inline void tasklet_enable(struct tasklet_struct *t) -{ - smp_mb__before_atomic_dec(); - atomic_dec(&t->count); -} - -static inline void tasklet_hi_enable(struct tasklet_struct *t) -{ - smp_mb__before_atomic_dec(); - atomic_dec(&t->count); -} +extern void tasklet_enable(struct tasklet_struct *t); +extern void tasklet_hi_enable(struct tasklet_struct *t); extern void tasklet_kill(struct tasklet_struct *t); extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); Index: linux-2.6.26/kernel/softirq.c =================================================================== --- linux-2.6.26.orig/kernel/softirq.c +++ linux-2.6.26/kernel/softirq.c @@ -427,15 +427,45 @@ struct tasklet_head static DEFINE_PER_CPU(struct tasklet_head, tasklet_vec) = { NULL }; static DEFINE_PER_CPU(struct tasklet_head, tasklet_hi_vec) = { NULL }; +static void inline +__tasklet_common_schedule(struct tasklet_struct *t, struct tasklet_head *head, unsigned int nr) +{ + if (tasklet_trylock(t)) { +again: + /* We may have been preempted before tasklet_trylock + * and __tasklet_action may have already run. + * So double check the sched bit while the takslet + * is locked before adding it to the list. + */ + if (test_bit(TASKLET_STATE_SCHED, &t->state)) { + t->next = NULL; + *head->tail = t; + head->tail = &(t->next); + raise_softirq_irqoff(nr); + tasklet_unlock(t); + } else { + /* This is subtle. If we hit the corner case above + * It is possible that we get preempted right here, + * and another task has successfully called + * tasklet_schedule(), then this function, and + * failed on the trylock. Thus we must be sure + * before releasing the tasklet lock, that the + * SCHED_BIT is clear. Otherwise the tasklet + * may get its SCHED_BIT set, but not added to the + * list + */ + if (!tasklet_tryunlock(t)) + goto again; + } + } +} + void __tasklet_schedule(struct tasklet_struct *t) { unsigned long flags; local_irq_save(flags); - t->next = NULL; - *__get_cpu_var(tasklet_vec).tail = t; - __get_cpu_var(tasklet_vec).tail = &(t->next); - raise_softirq_irqoff(TASKLET_SOFTIRQ); + __tasklet_common_schedule(t, &__get_cpu_var(tasklet_vec), TASKLET_SOFTIRQ); local_irq_restore(flags); } @@ -446,83 +476,131 @@ void __tasklet_hi_schedule(struct taskle unsigned long flags; local_irq_save(flags); - t->next = NULL; - *__get_cpu_var(tasklet_hi_vec).tail = t; - __get_cpu_var(tasklet_hi_vec).tail = &(t->next); - raise_softirq_irqoff(HI_SOFTIRQ); + __tasklet_common_schedule(t, &__get_cpu_var(tasklet_vec), HI_SOFTIRQ); local_irq_restore(flags); } EXPORT_SYMBOL(__tasklet_hi_schedule); -static void tasklet_action(struct softirq_action *a) +void tasklet_enable(struct tasklet_struct *t) { - struct tasklet_struct *list; + if (!atomic_dec_and_test(&t->count)) + return; + if (test_and_clear_bit(TASKLET_STATE_PENDING, &t->state)) + tasklet_schedule(t); +} - local_irq_disable(); - list = __get_cpu_var(tasklet_vec).head; - __get_cpu_var(tasklet_vec).head = NULL; - __get_cpu_var(tasklet_vec).tail = &__get_cpu_var(tasklet_vec).head; - local_irq_enable(); +EXPORT_SYMBOL(tasklet_enable); + +void tasklet_hi_enable(struct tasklet_struct *t) +{ + if (!atomic_dec_and_test(&t->count)) + return; + if (test_and_clear_bit(TASKLET_STATE_PENDING, &t->state)) + tasklet_hi_schedule(t); +} + +EXPORT_SYMBOL(tasklet_hi_enable); + +static void +__tasklet_action(struct softirq_action *a, struct tasklet_struct *list) +{ + int loops = 1000000; while (list) { struct tasklet_struct *t = list; list = list->next; - if (tasklet_trylock(t)) { - if (!atomic_read(&t->count)) { - if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state)) - BUG(); - t->func(t->data); - tasklet_unlock(t); - continue; - } - tasklet_unlock(t); + /* + * Should always succeed - after a tasklist got on the + * list (after getting the SCHED bit set from 0 to 1), + * nothing but the tasklet softirq it got queued to can + * lock it: + */ + if (!tasklet_trylock(t)) { + WARN_ON(1); + continue; } - local_irq_disable(); t->next = NULL; - *__get_cpu_var(tasklet_vec).tail = t; - __get_cpu_var(tasklet_vec).tail = &(t->next); - __do_raise_softirq_irqoff(TASKLET_SOFTIRQ); - local_irq_enable(); + + /* + * If we cannot handle the tasklet because it's disabled, + * mark it as pending. tasklet_enable() will later + * re-schedule the tasklet. + */ + if (unlikely(atomic_read(&t->count))) { +out_disabled: + /* implicit unlock: */ + wmb(); + t->state = TASKLET_STATEF_PENDING; + continue; + } + + /* + * After this point on the tasklet might be rescheduled + * on another CPU, but it can only be added to another + * CPU's tasklet list if we unlock the tasklet (which we + * dont do yet). + */ + if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state)) + WARN_ON(1); + +again: + t->func(t->data); + + /* + * Try to unlock the tasklet. We must use cmpxchg, because + * another CPU might have scheduled or disabled the tasklet. + * We only allow the STATE_RUN -> 0 transition here. + */ + while (!tasklet_tryunlock(t)) { + /* + * If it got disabled meanwhile, bail out: + */ + if (atomic_read(&t->count)) + goto out_disabled; + /* + * If it got scheduled meanwhile, re-execute + * the tasklet function: + */ + if (test_and_clear_bit(TASKLET_STATE_SCHED, &t->state)) + goto again; + if (!--loops) { + printk("hm, tasklet state: %08lx\n", t->state); + WARN_ON(1); + tasklet_unlock(t); + break; + } + } } } -static void tasklet_hi_action(struct softirq_action *a) +static void tasklet_action(struct softirq_action *a) { struct tasklet_struct *list; local_irq_disable(); - list = __get_cpu_var(tasklet_hi_vec).head; - __get_cpu_var(tasklet_hi_vec).head = NULL; - __get_cpu_var(tasklet_hi_vec).tail = &__get_cpu_var(tasklet_hi_vec).head; + list = __get_cpu_var(tasklet_vec).head; + __get_cpu_var(tasklet_vec).head = NULL; + __get_cpu_var(tasklet_vec).tail = &__get_cpu_var(tasklet_vec).head; local_irq_enable(); - while (list) { - struct tasklet_struct *t = list; + __tasklet_action(a, list); +} - list = list->next; +static void tasklet_hi_action(struct softirq_action *a) +{ + struct tasklet_struct *list; - if (tasklet_trylock(t)) { - if (!atomic_read(&t->count)) { - if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state)) - BUG(); - t->func(t->data); - tasklet_unlock(t); - continue; - } - tasklet_unlock(t); - } + local_irq_disable(); + list = __get_cpu_var(tasklet_hi_vec).head; + __get_cpu_var(tasklet_hi_vec).head = NULL; + __get_cpu_var(tasklet_hi_vec).tail = &__get_cpu_var(tasklet_vec).head; + local_irq_enable(); - local_irq_disable(); - t->next = NULL; - *__get_cpu_var(tasklet_hi_vec).tail = t; - __get_cpu_var(tasklet_hi_vec).tail = &(t->next); - __do_raise_softirq_irqoff(HI_SOFTIRQ); - local_irq_enable(); - } + __tasklet_action(a, list); } patches/tasklet-busy-loop-hack.patch0000664000076400007640000000322711043564036016566 0ustar tglxtglx--- include/linux/interrupt.h | 6 ++---- kernel/softirq.c | 20 ++++++++++++++++++++ 2 files changed, 22 insertions(+), 4 deletions(-) Index: linux-2.6.26/include/linux/interrupt.h =================================================================== --- linux-2.6.26.orig/include/linux/interrupt.h +++ linux-2.6.26/include/linux/interrupt.h @@ -380,10 +380,8 @@ static inline void tasklet_unlock(struct clear_bit(TASKLET_STATE_RUN, &(t)->state); } -static inline void tasklet_unlock_wait(struct tasklet_struct *t) -{ - while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } -} +extern void tasklet_unlock_wait(struct tasklet_struct *t); + #else #define tasklet_trylock(t) 1 #define tasklet_tryunlock(t) 1 Index: linux-2.6.26/kernel/softirq.c =================================================================== --- linux-2.6.26.orig/kernel/softirq.c +++ linux-2.6.26/kernel/softirq.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -647,6 +648,25 @@ void __init softirq_init(void) open_softirq(HI_SOFTIRQ, tasklet_hi_action, NULL); } +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT) + +void tasklet_unlock_wait(struct tasklet_struct *t) +{ + while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { + /* + * Hack for now to avoid this busy-loop: + */ +#ifdef CONFIG_PREEMPT_RT + msleep(1); +#else + barrier(); +#endif + } +} +EXPORT_SYMBOL(tasklet_unlock_wait); + +#endif + static int ksoftirqd(void * __data) { struct sched_param param = { .sched_priority = MAX_USER_RT_PRIO/2 }; patches/disable-irqpoll.patch0000664000076400007640000000176011043564036015347 0ustar tglxtglx kernel/irq/spurious.c | 10 ++++++++++ 1 file changed, 10 insertions(+) Index: linux-2.6.26/kernel/irq/spurious.c =================================================================== --- linux-2.6.26.orig/kernel/irq/spurious.c +++ linux-2.6.26/kernel/irq/spurious.c @@ -244,6 +244,11 @@ MODULE_PARM_DESC(noirqdebug, "Disable ir static int __init irqfixup_setup(char *str) { +#ifdef CONFIG_PREEMPT_RT + printk(KERN_WARNING "irqfixup boot option not supported " + "w/ CONFIG_PREEMPT_RT\n"); + return 1; +#endif irqfixup = 1; printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n"); printk(KERN_WARNING "This may impact system performance.\n"); @@ -257,6 +262,11 @@ MODULE_PARM_DESC("irqfixup", "0: No fixu static int __init irqpoll_setup(char *str) { +#ifdef CONFIG_PREEMPT_RT + printk(KERN_WARNING "irqpoll boot option not supported " + "w/ CONFIG_PREEMPT_RT\n"); + return 1; +#endif irqfixup = 2; printk(KERN_WARNING "Misrouted IRQ fixup and polling support " "enabled\n"); patches/kstat-add-rt-stats.patch0000664000076400007640000001227011043564035015714 0ustar tglxtglxFrom: Thomas Gleixner Subject: add rt stats to /proc/stat add RT stats to /proc/stat Signed-off-by: Ingo Molnar fs/proc/proc_misc.c | 24 ++++++++++++++++++------ include/linux/kernel_stat.h | 2 ++ kernel/sched.c | 6 +++++- 3 files changed, 25 insertions(+), 7 deletions(-) Index: linux-2.6.26/fs/proc/proc_misc.c =================================================================== --- linux-2.6.26.orig/fs/proc/proc_misc.c +++ linux-2.6.26/fs/proc/proc_misc.c @@ -476,7 +476,8 @@ static int show_stat(struct seq_file *p, { int i; unsigned long jif; - cputime64_t user, nice, system, idle, iowait, irq, softirq, steal; + cputime64_t user_rt, user, nice, system_rt, system, idle, + iowait, irq, softirq, steal; cputime64_t guest; u64 sum = 0; struct timespec boottime; @@ -486,7 +487,7 @@ static int show_stat(struct seq_file *p, if (!per_irq_sum) return -ENOMEM; - user = nice = system = idle = iowait = + user_rt = user = nice = system_rt = system = idle = iowait = irq = softirq = steal = cputime64_zero; guest = cputime64_zero; getboottime(&boottime); @@ -503,6 +504,8 @@ static int show_stat(struct seq_file *p, irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq); softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq); steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal); + user_rt = cputime64_add(user_rt, kstat_cpu(i).cpustat.user_rt); + system_rt = cputime64_add(system_rt, kstat_cpu(i).cpustat.system_rt); guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest); for (j = 0; j < NR_IRQS; j++) { unsigned int temp = kstat_cpu(i).irqs[j]; @@ -511,7 +514,10 @@ static int show_stat(struct seq_file *p, } } - seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n", + user = cputime64_add(user_rt, user); + system = cputime64_add(system_rt, system); + + seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n", (unsigned long long)cputime64_to_clock_t(user), (unsigned long long)cputime64_to_clock_t(nice), (unsigned long long)cputime64_to_clock_t(system), @@ -520,13 +526,17 @@ static int show_stat(struct seq_file *p, (unsigned long long)cputime64_to_clock_t(irq), (unsigned long long)cputime64_to_clock_t(softirq), (unsigned long long)cputime64_to_clock_t(steal), + (unsigned long long)cputime64_to_clock_t(user_rt), + (unsigned long long)cputime64_to_clock_t(system_rt), (unsigned long long)cputime64_to_clock_t(guest)); for_each_online_cpu(i) { /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ - user = kstat_cpu(i).cpustat.user; + user_rt = kstat_cpu(i).cpustat.user_rt; + system_rt = kstat_cpu(i).cpustat.system_rt; + user = cputime64_add(user_rt, kstat_cpu(i).cpustat.user); nice = kstat_cpu(i).cpustat.nice; - system = kstat_cpu(i).cpustat.system; + system = cputime64_add(system_rt, kstat_cpu(i).cpustat.system); idle = kstat_cpu(i).cpustat.idle; iowait = kstat_cpu(i).cpustat.iowait; irq = kstat_cpu(i).cpustat.irq; @@ -534,7 +544,7 @@ static int show_stat(struct seq_file *p, steal = kstat_cpu(i).cpustat.steal; guest = kstat_cpu(i).cpustat.guest; seq_printf(p, - "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n", + "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n", i, (unsigned long long)cputime64_to_clock_t(user), (unsigned long long)cputime64_to_clock_t(nice), @@ -544,6 +554,8 @@ static int show_stat(struct seq_file *p, (unsigned long long)cputime64_to_clock_t(irq), (unsigned long long)cputime64_to_clock_t(softirq), (unsigned long long)cputime64_to_clock_t(steal), + (unsigned long long)cputime64_to_clock_t(user_rt), + (unsigned long long)cputime64_to_clock_t(system_rt), (unsigned long long)cputime64_to_clock_t(guest)); } seq_printf(p, "intr %llu", (unsigned long long)sum); Index: linux-2.6.26/include/linux/kernel_stat.h =================================================================== --- linux-2.6.26.orig/include/linux/kernel_stat.h +++ linux-2.6.26/include/linux/kernel_stat.h @@ -23,6 +23,8 @@ struct cpu_usage_stat { cputime64_t idle; cputime64_t iowait; cputime64_t steal; + cputime64_t user_rt; + cputime64_t system_rt; cputime64_t guest; }; Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -3981,7 +3981,9 @@ void account_user_time(struct task_struc /* Add user time to cpustat. */ tmp = cputime_to_cputime64(cputime); - if (TASK_NICE(p) > 0) + if (rt_task(p)) + cpustat->user_rt = cputime64_add(cpustat->user_rt, tmp); + else if (TASK_NICE(p) > 0) cpustat->nice = cputime64_add(cpustat->nice, tmp); else cpustat->user = cputime64_add(cpustat->user, tmp); @@ -4042,6 +4044,8 @@ void account_system_time(struct task_str cpustat->irq = cputime64_add(cpustat->irq, tmp); else if (softirq_count() || (p->flags & PF_SOFTIRQ)) cpustat->softirq = cputime64_add(cpustat->softirq, tmp); + else if (rt_task(p)) + cpustat->system_rt = cputime64_add(cpustat->system_rt, tmp); else if (p != rq->idle) cpustat->system = cputime64_add(cpustat->system, tmp); else if (atomic_read(&rq->nr_iowait) > 0) patches/preempt-realtime-warn-and-bug-on.patch0000664000076400007640000000174711043564035020436 0ustar tglxtglx--- include/asm-generic/bug.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) Index: linux-2.6.26/include/asm-generic/bug.h =================================================================== --- linux-2.6.26.orig/include/asm-generic/bug.h +++ linux-2.6.26/include/asm-generic/bug.h @@ -3,6 +3,8 @@ #include +extern void __WARN_ON(const char *func, const char *file, const int line); + #ifdef CONFIG_BUG #ifdef CONFIG_GENERIC_BUG @@ -81,4 +83,16 @@ extern void warn_on_slowpath(const char # define WARN_ON_SMP(x) do { } while (0) #endif +#ifdef CONFIG_PREEMPT_RT +# define BUG_ON_RT(c) BUG_ON(c) +# define BUG_ON_NONRT(c) do { } while (0) +# define WARN_ON_RT(condition) WARN_ON(condition) +# define WARN_ON_NONRT(condition) do { } while (0) +#else +# define BUG_ON_RT(c) do { } while (0) +# define BUG_ON_NONRT(c) BUG_ON(c) +# define WARN_ON_RT(condition) do { } while (0) +# define WARN_ON_NONRT(condition) WARN_ON(condition) +#endif + #endif patches/cputimer-thread-rt_A0.patch0000664000076400007640000002142511043564035016323 0ustar tglxtglxIngo, This patch re-adds the posix-cpu-timer functionality by running it from a per-cpu RT thread. This allows cpu rlimits to be enforced against RT processes that would otherwise starve the system. thanks -john Signed-off-by: John Stultz include/linux/init_task.h | 1 include/linux/posix-timers.h | 2 include/linux/sched.h | 2 init/main.c | 2 kernel/fork.c | 2 kernel/posix-cpu-timers.c | 176 ++++++++++++++++++++++++++++++++++++++++++- 6 files changed, 180 insertions(+), 5 deletions(-) Index: linux-2.6.26/include/linux/init_task.h =================================================================== --- linux-2.6.26.orig/include/linux/init_task.h +++ linux-2.6.26/include/linux/init_task.h @@ -182,6 +182,7 @@ extern struct group_info init_groups; .journal_info = NULL, \ .cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \ .fs_excl = ATOMIC_INIT(0), \ + .posix_timer_list = NULL, \ .pi_lock = RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock), \ .pids = { \ [PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \ Index: linux-2.6.26/include/linux/posix-timers.h =================================================================== --- linux-2.6.26.orig/include/linux/posix-timers.h +++ linux-2.6.26/include/linux/posix-timers.h @@ -115,4 +115,6 @@ void set_process_cpu_timer(struct task_s long clock_nanosleep_restart(struct restart_block *restart_block); +int posix_cpu_thread_init(void); + #endif Index: linux-2.6.26/include/linux/sched.h =================================================================== --- linux-2.6.26.orig/include/linux/sched.h +++ linux-2.6.26/include/linux/sched.h @@ -1184,6 +1184,8 @@ struct task_struct { unsigned long long it_sched_expires; struct list_head cpu_timers[3]; + struct task_struct* posix_timer_list; + /* process credentials */ uid_t uid,euid,suid,fsuid; gid_t gid,egid,sgid,fsgid; Index: linux-2.6.26/init/main.c =================================================================== --- linux-2.6.26.orig/init/main.c +++ linux-2.6.26/init/main.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #include #include @@ -783,6 +784,7 @@ static void __init do_pre_smp_initcalls( extern int spawn_ksoftirqd(void); migration_init(); + posix_cpu_thread_init(); spawn_ksoftirqd(); if (!nosoftlockup) spawn_softlockup_task(); Index: linux-2.6.26/kernel/fork.c =================================================================== --- linux-2.6.26.orig/kernel/fork.c +++ linux-2.6.26/kernel/fork.c @@ -991,7 +991,7 @@ static struct task_struct *copy_process( INIT_LIST_HEAD(&p->cpu_timers[0]); INIT_LIST_HEAD(&p->cpu_timers[1]); INIT_LIST_HEAD(&p->cpu_timers[2]); - + p->posix_timer_list = NULL; p->lock_depth = -1; /* -1 = no lock */ do_posix_clock_monotonic_gettime(&p->start_time); p->real_start_time = p->start_time; Index: linux-2.6.26/kernel/posix-cpu-timers.c =================================================================== --- linux-2.6.26.orig/kernel/posix-cpu-timers.c +++ linux-2.6.26/kernel/posix-cpu-timers.c @@ -577,7 +577,7 @@ static void arm_timer(struct k_itimer *t p->cpu_timers : p->signal->cpu_timers); head += CPUCLOCK_WHICH(timer->it_clock); - BUG_ON(!irqs_disabled()); + BUG_ON_NONRT(!irqs_disabled()); spin_lock(&p->sighand->siglock); listpos = head; @@ -734,7 +734,7 @@ int posix_cpu_timer_set(struct k_itimer /* * Disarm any old timer after extracting its expiry time. */ - BUG_ON(!irqs_disabled()); + BUG_ON_NONRT(!irqs_disabled()); ret = 0; spin_lock(&p->sighand->siglock); @@ -1316,12 +1316,11 @@ out: * already updated our counts. We need to check if any timers fire now. * Interrupts are disabled. */ -void run_posix_cpu_timers(struct task_struct *tsk) +void __run_posix_cpu_timers(struct task_struct *tsk) { LIST_HEAD(firing); struct k_itimer *timer, *next; - BUG_ON(!irqs_disabled()); #define UNEXPIRED(clock) \ (cputime_eq(tsk->it_##clock##_expires, cputime_zero) || \ @@ -1384,6 +1383,169 @@ void run_posix_cpu_timers(struct task_st } } +#include +#include +DEFINE_PER_CPU(struct task_struct *, posix_timer_task); +DEFINE_PER_CPU(struct task_struct *, posix_timer_tasklist); + +static int posix_cpu_timers_thread(void *data) +{ + int cpu = (long)data; + + BUG_ON(per_cpu(posix_timer_task,cpu) != current); + + + while (!kthread_should_stop()) { + struct task_struct *tsk = NULL; + struct task_struct *next = NULL; + + if (cpu_is_offline(cpu)) { + goto wait_to_die; + } + + /* grab task list */ + raw_local_irq_disable(); + tsk = per_cpu(posix_timer_tasklist, cpu); + per_cpu(posix_timer_tasklist, cpu) = NULL; + raw_local_irq_enable(); + + + /* its possible the list is empty, just return */ + if (!tsk) { + set_current_state(TASK_INTERRUPTIBLE); + schedule(); + __set_current_state(TASK_RUNNING); + continue; + } + + /* Process task list */ + while (1) { + /* save next */ + next = tsk->posix_timer_list; + + /* run the task timers, clear its ptr and + * unreference it + */ + __run_posix_cpu_timers(tsk); + tsk->posix_timer_list = NULL; + put_task_struct(tsk); + + /* check if this is the last on the list */ + if (next == tsk) + break; + tsk = next; + } + } + return 0; + +wait_to_die: + /* Wait for kthread_stop */ + set_current_state(TASK_INTERRUPTIBLE); + while (!kthread_should_stop()) { + schedule(); + set_current_state(TASK_INTERRUPTIBLE); + } + __set_current_state(TASK_RUNNING); + return 0; +} + +void run_posix_cpu_timers(struct task_struct *tsk) +{ + unsigned long cpu = smp_processor_id(); + struct task_struct *tasklist; + + BUG_ON(!irqs_disabled()); + if(!per_cpu(posix_timer_task, cpu)) + return; + /* get per-cpu references */ + tasklist = per_cpu(posix_timer_tasklist, cpu); + + /* check to see if we're already queued */ + if (!tsk->posix_timer_list) { + get_task_struct(tsk); + if (tasklist) { + tsk->posix_timer_list = tasklist; + } else { + /* + * The list is terminated by a self-pointing + * task_struct + */ + tsk->posix_timer_list = tsk; + } + per_cpu(posix_timer_tasklist, cpu) = tsk; + } + /* XXX signal the thread somehow */ + wake_up_process(per_cpu(posix_timer_task,cpu)); +} + + + + +/* + * posix_cpu_thread_call - callback that gets triggered when a CPU is added. + * Here we can start up the necessary migration thread for the new CPU. + */ +static int posix_cpu_thread_call(struct notifier_block *nfb, unsigned long action, + void *hcpu) +{ + int cpu = (long)hcpu; + struct task_struct *p; + struct sched_param param; + + switch (action) { + case CPU_UP_PREPARE: + p = kthread_create(posix_cpu_timers_thread, hcpu, + "posix_cpu_timers/%d",cpu); + if (IS_ERR(p)) + return NOTIFY_BAD; + p->flags |= PF_NOFREEZE; + kthread_bind(p, cpu); + /* Must be high prio to avoid getting starved */ + param.sched_priority = MAX_RT_PRIO-1; + sched_setscheduler(p, SCHED_FIFO, ¶m); + per_cpu(posix_timer_task,cpu) = p; + break; + case CPU_ONLINE: + /* Strictly unneccessary, as first user will wake it. */ + wake_up_process(per_cpu(posix_timer_task,cpu)); + break; +#ifdef CONFIG_HOTPLUG_CPU + case CPU_UP_CANCELED: + /* Unbind it from offline cpu so it can run. Fall thru. */ + kthread_bind(per_cpu(posix_timer_task,cpu), + any_online_cpu(cpu_online_map)); + kthread_stop(per_cpu(posix_timer_task,cpu)); + per_cpu(posix_timer_task,cpu) = NULL; + break; + case CPU_DEAD: + kthread_stop(per_cpu(posix_timer_task,cpu)); + per_cpu(posix_timer_task,cpu) = NULL; + break; +#endif + } + return NOTIFY_OK; +} + +/* Register at highest priority so that task migration (migrate_all_tasks) + * happens before everything else. + */ +static struct notifier_block __devinitdata posix_cpu_thread_notifier = { + .notifier_call = posix_cpu_thread_call, + .priority = 10 +}; + +int __init posix_cpu_thread_init(void) +{ + void *cpu = (void *)(long)smp_processor_id(); + /* Start one for boot CPU. */ + posix_cpu_thread_call(&posix_cpu_thread_notifier, CPU_UP_PREPARE, cpu); + posix_cpu_thread_call(&posix_cpu_thread_notifier, CPU_ONLINE, cpu); + register_cpu_notifier(&posix_cpu_thread_notifier); + return 0; +} + + + /* * Set one of the process-wide special case CPU timers. * The tasklist_lock and tsk->sighand->siglock must be held by the caller. @@ -1649,6 +1811,12 @@ static __init int init_posix_cpu_timers( .nsleep = thread_cpu_nsleep, .nsleep_restart = thread_cpu_nsleep_restart, }; + unsigned long cpu; + + /* init the per-cpu posix_timer_tasklets */ + for_each_cpu_mask(cpu, cpu_possible_map) { + per_cpu(posix_timer_tasklist, cpu) = NULL; + } register_posix_clock(CLOCK_PROCESS_CPUTIME_ID, &process); register_posix_clock(CLOCK_THREAD_CPUTIME_ID, &thread); patches/cputimer-thread-rt-fix.patch0000664000076400007640000000313111043564035016561 0ustar tglxtglx--- kernel/posix-cpu-timers.c | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-) Index: linux-2.6.26/kernel/posix-cpu-timers.c =================================================================== --- linux-2.6.26.orig/kernel/posix-cpu-timers.c +++ linux-2.6.26/kernel/posix-cpu-timers.c @@ -1321,18 +1321,6 @@ void __run_posix_cpu_timers(struct task_ LIST_HEAD(firing); struct k_itimer *timer, *next; - -#define UNEXPIRED(clock) \ - (cputime_eq(tsk->it_##clock##_expires, cputime_zero) || \ - cputime_lt(clock##_ticks(tsk), tsk->it_##clock##_expires)) - - if (UNEXPIRED(prof) && UNEXPIRED(virt) && - (tsk->it_sched_expires == 0 || - tsk->se.sum_exec_runtime < tsk->it_sched_expires)) - return; - -#undef UNEXPIRED - /* * Double-check with locks held. */ @@ -1457,6 +1445,19 @@ void run_posix_cpu_timers(struct task_st BUG_ON(!irqs_disabled()); if(!per_cpu(posix_timer_task, cpu)) return; + + +#define UNEXPIRED(clock) \ + (cputime_eq(tsk->it_##clock##_expires, cputime_zero) || \ + cputime_lt(clock##_ticks(tsk), tsk->it_##clock##_expires)) + + if (UNEXPIRED(prof) && UNEXPIRED(virt) && + (tsk->it_sched_expires == 0 || + tsk->sum_exec_runtime < tsk->it_sched_expires)) + return; + +#undef UNEXPIRED + /* get per-cpu references */ tasklist = per_cpu(posix_timer_tasklist, cpu); @@ -1475,7 +1476,7 @@ void run_posix_cpu_timers(struct task_st per_cpu(posix_timer_tasklist, cpu) = tsk; } /* XXX signal the thread somehow */ - wake_up_process(per_cpu(posix_timer_task,cpu)); + wake_up_process(per_cpu(posix_timer_task, cpu)); } patches/posix-cpu-timers-fix.patch0000664000076400007640000000164411043564035016300 0ustar tglxtglx kernel/posix-cpu-timers.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) Index: linux-2.6.26/kernel/posix-cpu-timers.c =================================================================== --- linux-2.6.26.orig/kernel/posix-cpu-timers.c +++ linux-2.6.26/kernel/posix-cpu-timers.c @@ -1325,6 +1325,12 @@ void __run_posix_cpu_timers(struct task_ * Double-check with locks held. */ read_lock(&tasklist_lock); + /* Make sure the task doesn't exit under us. */ + if (unlikely(tsk->exit_state)) { + read_unlock(&tasklist_lock); + return; + } + if (likely(tsk->signal != NULL)) { spin_lock(&tsk->sighand->siglock); @@ -1453,7 +1459,7 @@ void run_posix_cpu_timers(struct task_st if (UNEXPIRED(prof) && UNEXPIRED(virt) && (tsk->it_sched_expires == 0 || - tsk->sum_exec_runtime < tsk->it_sched_expires)) + tsk->se.sum_exec_runtime < tsk->it_sched_expires)) return; #undef UNEXPIRED patches/vortex-fix.patch0000664000076400007640000000516311043564035014377 0ustar tglxtglx Argh, cut and paste wasn't enough... Use this patch instead. It needs an irq disable. But, believe it or not, on SMP this is actually better. If the irq is shared (as it is in Mark's case), we don't stop the irq of other devices from being handled on another CPU (unfortunately for Mark, he pinned all interrupts to one CPU). Andrew, should this be changed in mainline too? -- Steve Signed-off-by: Steven Rostedt drivers/net/3c59x.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-) Index: linux-2.6.26/drivers/net/3c59x.c =================================================================== --- linux-2.6.26.orig/drivers/net/3c59x.c +++ linux-2.6.26/drivers/net/3c59x.c @@ -791,9 +791,9 @@ static void poll_vortex(struct net_devic { struct vortex_private *vp = netdev_priv(dev); unsigned long flags; - local_irq_save(flags); + local_irq_save_nort(flags); (vp->full_bus_master_rx ? boomerang_interrupt:vortex_interrupt)(dev->irq,dev); - local_irq_restore(flags); + local_irq_restore_nort(flags); } #endif @@ -1738,6 +1738,7 @@ vortex_timer(unsigned long data) int next_tick = 60*HZ; int ok = 0; int media_status, old_window; + unsigned long flags; if (vortex_debug > 2) { printk(KERN_DEBUG "%s: Media selection timer tick happened, %s.\n", @@ -1745,7 +1746,7 @@ vortex_timer(unsigned long data) printk(KERN_DEBUG "dev->watchdog_timeo=%d\n", dev->watchdog_timeo); } - disable_irq_lockdep(dev->irq); + spin_lock_irqsave(&vp->lock, flags); old_window = ioread16(ioaddr + EL3_CMD) >> 13; EL3WINDOW(4); media_status = ioread16(ioaddr + Wn4_Media); @@ -1768,10 +1769,7 @@ vortex_timer(unsigned long data) case XCVR_MII: case XCVR_NWAY: { ok = 1; - /* Interrupts are already disabled */ - spin_lock(&vp->lock); vortex_check_media(dev, 0); - spin_unlock(&vp->lock); } break; default: /* Other media types handled by Tx timeouts. */ @@ -1827,7 +1825,7 @@ leave_media_alone: dev->name, media_tbl[dev->if_port].name); EL3WINDOW(old_window); - enable_irq_lockdep(dev->irq); + spin_unlock_irqrestore(&vp->lock, flags); mod_timer(&vp->timer, RUN_AT(next_tick)); if (vp->deferred) iowrite16(FakeIntr, ioaddr + EL3_CMD); @@ -1861,12 +1859,12 @@ static void vortex_tx_timeout(struct net * Block interrupts because vortex_interrupt does a bare spin_lock() */ unsigned long flags; - local_irq_save(flags); + local_irq_save_nort(flags); if (vp->full_bus_master_tx) boomerang_interrupt(dev->irq, dev); else vortex_interrupt(dev->irq, dev); - local_irq_restore(flags); + local_irq_restore_nort(flags); } } patches/serial-locking-rt-cleanup.patch0000664000076400007640000000214711043564034017235 0ustar tglxtglx drivers/serial/8250.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) Index: linux-2.6.26/drivers/serial/8250.c =================================================================== --- linux-2.6.26.orig/drivers/serial/8250.c +++ linux-2.6.26/drivers/serial/8250.c @@ -2536,14 +2536,10 @@ serial8250_console_write(struct console touch_nmi_watchdog(); - local_irq_save(flags); - if (up->port.sysrq) { - /* serial8250_handle_port() already took the lock */ - locked = 0; - } else if (oops_in_progress) { - locked = spin_trylock(&up->port.lock); - } else - spin_lock(&up->port.lock); + if (up->port.sysrq || oops_in_progress) + locked = spin_trylock_irqsave(&up->port.lock, flags); + else + spin_lock_irqsave(&up->port.lock, flags); /* * First save the IER then disable the interrupts @@ -2575,8 +2571,7 @@ serial8250_console_write(struct console check_modem_status(up); if (locked) - spin_unlock(&up->port.lock); - local_irq_restore(flags); + spin_unlock_irqrestore(&up->port.lock, flags); } static int __init serial8250_console_setup(struct console *co, char *options) patches/fix-emac-locking-2.6.16.patch0000664000076400007640000000551711043564034016133 0ustar tglxtglx drivers/net/ibm_emac/ibm_emac_core.c | 11 +++++++++++ drivers/net/ibm_emac/ibm_emac_core.h | 2 ++ 2 files changed, 13 insertions(+) Index: linux-2.6.26/drivers/net/ibm_emac/ibm_emac_core.c =================================================================== --- linux-2.6.26.orig/drivers/net/ibm_emac/ibm_emac_core.c +++ linux-2.6.26/drivers/net/ibm_emac/ibm_emac_core.c @@ -1058,6 +1058,8 @@ static inline int emac_xmit_finish(struc ++dev->stats.tx_packets; dev->stats.tx_bytes += len; + spin_unlock(&dev->tx_lock); + return 0; } @@ -1071,6 +1073,7 @@ static int emac_start_xmit(struct sk_buf u16 ctrl = EMAC_TX_CTRL_GFCS | EMAC_TX_CTRL_GP | MAL_TX_CTRL_READY | MAL_TX_CTRL_LAST | emac_tx_csum(dev, skb); + spin_lock(&dev->tx_lock); slot = dev->tx_slot++; if (dev->tx_slot == NUM_TX_BUFF) { dev->tx_slot = 0; @@ -1133,6 +1136,8 @@ static int emac_start_xmit_sg(struct sk_ if (likely(!nr_frags && len <= MAL_MAX_TX_SIZE)) return emac_start_xmit(skb, ndev); + spin_lock(&dev->tx_lock); + len -= skb->data_len; /* Note, this is only an *estimation*, we can still run out of empty @@ -1201,6 +1206,7 @@ static int emac_start_xmit_sg(struct sk_ stop_queue: netif_stop_queue(ndev); DBG2("%d: stopped TX queue" NL, dev->def->index); + spin_unlock(&dev->tx_lock); return 1; } #else @@ -1240,6 +1246,7 @@ static void emac_poll_tx(void *param) DBG2("%d: poll_tx, %d %d" NL, dev->def->index, dev->tx_cnt, dev->ack_slot); + spin_lock(&dev->tx_lock); if (dev->tx_cnt) { u16 ctrl; int slot = dev->ack_slot, n = 0; @@ -1249,6 +1256,7 @@ static void emac_poll_tx(void *param) struct sk_buff *skb = dev->tx_skb[slot]; ++n; + spin_unlock(&dev->tx_lock); if (skb) { dev_kfree_skb(skb); dev->tx_skb[slot] = NULL; @@ -1258,6 +1266,7 @@ static void emac_poll_tx(void *param) if (unlikely(EMAC_IS_BAD_TX(ctrl))) emac_parse_tx_error(dev, ctrl); + spin_lock(&dev->tx_lock); if (--dev->tx_cnt) goto again; } @@ -1270,6 +1279,7 @@ static void emac_poll_tx(void *param) DBG2("%d: tx %d pkts" NL, dev->def->index, n); } } + spin_unlock(&dev->tx_lock); } static inline void emac_recycle_rx_skb(struct ocp_enet_private *dev, int slot, @@ -1964,6 +1974,7 @@ static int __init emac_probe(struct ocp_ dev->ndev = ndev; dev->ldev = &ocpdev->dev; dev->def = ocpdev->def; + spin_lock_init(&dev->tx_lock); /* Find MAL device we are connected to */ maldev = Index: linux-2.6.26/drivers/net/ibm_emac/ibm_emac_core.h =================================================================== --- linux-2.6.26.orig/drivers/net/ibm_emac/ibm_emac_core.h +++ linux-2.6.26/drivers/net/ibm_emac/ibm_emac_core.h @@ -193,6 +193,8 @@ struct ocp_enet_private { struct ibm_emac_error_stats estats; struct net_device_stats nstats; + spinlock_t tx_lock; + struct device* ldev; }; patches/serial-slow-machines.patch0000664000076400007640000000317711043564034016314 0ustar tglxtglx--- drivers/char/tty_io.c | 4 ++++ drivers/serial/8250.c | 11 ++++++++++- 2 files changed, 14 insertions(+), 1 deletion(-) Index: linux-2.6.26/drivers/char/tty_io.c =================================================================== --- linux-2.6.26.orig/drivers/char/tty_io.c +++ linux-2.6.26/drivers/char/tty_io.c @@ -3795,10 +3795,14 @@ void tty_flip_buffer_push(struct tty_str tty->buf.tail->commit = tty->buf.tail->used; spin_unlock_irqrestore(&tty->buf.lock, flags); +#ifndef CONFIG_PREEMPT_RT if (tty->low_latency) flush_to_ldisc(&tty->buf.work.work); else schedule_delayed_work(&tty->buf.work, 1); +#else + flush_to_ldisc(&tty->buf.work.work); +#endif } EXPORT_SYMBOL(tty_flip_buffer_push); Index: linux-2.6.26/drivers/serial/8250.c =================================================================== --- linux-2.6.26.orig/drivers/serial/8250.c +++ linux-2.6.26/drivers/serial/8250.c @@ -1454,7 +1454,10 @@ static irqreturn_t serial8250_interrupt( { struct irq_info *i = dev_id; struct list_head *l, *end = NULL; - int pass_counter = 0, handled = 0; +#ifndef CONFIG_PREEMPT_RT + int pass_counter = 0; +#endif + int handled = 0; DEBUG_INTR("serial8250_interrupt(%d)...", irq); @@ -1492,12 +1495,18 @@ static irqreturn_t serial8250_interrupt( l = l->next; + /* + * On preempt-rt we can be preempted and run in our + * own thread. + */ +#ifndef CONFIG_PREEMPT_RT if (l == i->head && pass_counter++ > PASS_LIMIT) { /* If we hit this, we're dead. */ printk(KERN_ERR "serial8250: too much work for " "irq%d\n", irq); break; } +#endif } while (l != end); spin_unlock(&i->lock); patches/preempt-realtime-ftrace.patch0000664000076400007640000000607511043564034017004 0ustar tglxtglx--- kernel/trace/ftrace.c | 4 ++-- kernel/trace/trace.c | 2 +- kernel/trace/trace_hist.c | 2 +- kernel/trace/trace_irqsoff.c | 2 +- kernel/trace/trace_sched_wakeup.c | 2 +- 5 files changed, 6 insertions(+), 6 deletions(-) Index: linux-2.6.26/kernel/trace/ftrace.c =================================================================== --- linux-2.6.26.orig/kernel/trace/ftrace.c +++ linux-2.6.26/kernel/trace/ftrace.c @@ -42,7 +42,7 @@ static int last_ftrace_enabled; */ static int ftrace_disabled __read_mostly; -static DEFINE_SPINLOCK(ftrace_lock); +static DEFINE_RAW_SPINLOCK(ftrace_lock); static DEFINE_MUTEX(ftrace_sysctl_lock); static struct ftrace_ops ftrace_list_end __read_mostly = @@ -194,7 +194,7 @@ static struct hlist_head ftrace_hash[FTR static DEFINE_PER_CPU(int, ftrace_shutdown_disable_cpu); -static DEFINE_SPINLOCK(ftrace_shutdown_lock); +static DEFINE_RAW_SPINLOCK(ftrace_shutdown_lock); static DEFINE_MUTEX(ftraced_lock); static DEFINE_MUTEX(ftrace_regex_lock); Index: linux-2.6.26/kernel/trace/trace.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace.c +++ linux-2.6.26/kernel/trace/trace.c @@ -669,7 +669,7 @@ static unsigned map_pid_to_cmdline[PID_M static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; static int cmdline_idx; -static DEFINE_SPINLOCK(trace_cmdline_lock); +static DEFINE_RAW_SPINLOCK(trace_cmdline_lock); /* temporary disable recording */ atomic_t trace_record_cmdline_disabled __read_mostly; Index: linux-2.6.26/kernel/trace/trace_hist.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace_hist.c +++ linux-2.6.26/kernel/trace/trace_hist.c @@ -412,7 +412,7 @@ int tracing_wakeup_hist __read_mostly = static unsigned wakeup_prio = (unsigned)-1 ; static struct task_struct *wakeup_task; static cycle_t wakeup_start; -static DEFINE_SPINLOCK(wakeup_lock); +static DEFINE_RAW_SPINLOCK(wakeup_lock); notrace void tracing_hist_wakeup_start(struct task_struct *p, struct task_struct *curr) Index: linux-2.6.26/kernel/trace/trace_irqsoff.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace_irqsoff.c +++ linux-2.6.26/kernel/trace/trace_irqsoff.c @@ -24,7 +24,7 @@ static int tracer_enabled __read_most static DEFINE_PER_CPU(int, tracing_cpu); -static DEFINE_SPINLOCK(max_trace_lock); +static DEFINE_RAW_SPINLOCK(max_trace_lock); enum { TRACER_IRQS_OFF = (1 << 1), Index: linux-2.6.26/kernel/trace/trace_sched_wakeup.c =================================================================== --- linux-2.6.26.orig/kernel/trace/trace_sched_wakeup.c +++ linux-2.6.26/kernel/trace/trace_sched_wakeup.c @@ -26,7 +26,7 @@ static struct task_struct *wakeup_task; static int wakeup_cpu; static unsigned wakeup_prio = -1; -static DEFINE_SPINLOCK(wakeup_lock); +static DEFINE_RAW_SPINLOCK(wakeup_lock); static void __wakeup_reset(struct trace_array *tr); patches/preempt-realtime-ftrace-disable-ftraced.patch0000664000076400007640000000121311043564034022000 0ustar tglxtglx--- init/main.c | 4 ++++ 1 file changed, 4 insertions(+) Index: linux-2.6.26/init/main.c =================================================================== --- linux-2.6.26.orig/init/main.c +++ linux-2.6.26/init/main.c @@ -62,6 +62,7 @@ #include #include #include +#include #include #include @@ -343,6 +344,9 @@ static int __init rdinit_setup(char *str { unsigned int i; +#ifdef CONFIG_PREEMPT_RT + ftrace_disable_daemon(); +#endif ramdisk_execute_command = str; /* See "auto" comment in init_setup */ for (i = 1; i < MAX_INIT_ARGS; i++) patches/preempt-realtime-arm.patch0000664000076400007640000001700611043564033016312 0ustar tglxtglx--- arch/arm/kernel/dma.c | 2 +- arch/arm/kernel/irq.c | 2 +- arch/arm/kernel/process.c | 2 +- arch/arm/kernel/signal.c | 8 ++++++++ arch/arm/kernel/smp.c | 2 +- arch/arm/kernel/traps.c | 4 ++-- arch/arm/mm/consistent.c | 2 +- arch/arm/mm/copypage-v4mc.c | 2 +- arch/arm/mm/copypage-v6.c | 2 +- arch/arm/mm/copypage-xscale.c | 2 +- arch/arm/mm/mmu.c | 2 +- include/asm-arm/dma.h | 2 +- include/asm-arm/futex.h | 2 +- include/asm-arm/tlb.h | 9 ++++++--- 14 files changed, 27 insertions(+), 16 deletions(-) Index: linux-2.6.26/arch/arm/kernel/dma.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/dma.c +++ linux-2.6.26/arch/arm/kernel/dma.c @@ -20,7 +20,7 @@ #include -DEFINE_SPINLOCK(dma_spin_lock); +DEFINE_RAW_SPINLOCK(dma_spin_lock); EXPORT_SYMBOL(dma_spin_lock); static dma_t dma_chan[MAX_DMA_CHANNELS]; Index: linux-2.6.26/arch/arm/kernel/irq.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/irq.c +++ linux-2.6.26/arch/arm/kernel/irq.c @@ -102,7 +102,7 @@ unlock: /* Handle bad interrupts */ static struct irq_desc bad_irq_desc = { .handle_irq = handle_bad_irq, - .lock = SPIN_LOCK_UNLOCKED + .lock = RAW_SPIN_LOCK_UNLOCKED(bad_irq_desc.lock) }; /* Index: linux-2.6.26/arch/arm/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/process.c +++ linux-2.6.26/arch/arm/kernel/process.c @@ -36,7 +36,7 @@ #include #include -DEFINE_SPINLOCK(futex_atomic_lock); +DEFINE_RAW_SPINLOCK(futex_atomic_lock); static const char *processor_modes[] = { "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" , Index: linux-2.6.26/arch/arm/kernel/signal.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/signal.c +++ linux-2.6.26/arch/arm/kernel/signal.c @@ -623,6 +623,14 @@ static int do_signal(sigset_t *oldset, s siginfo_t info; int signr; +#ifdef CONFIG_PREEMPT_RT + /* + * Fully-preemptible kernel does not need interrupts disabled: + */ + local_irq_enable(); + preempt_check_resched(); +#endif + /* * We want the common case to go fast, which * is why we may in certain cases get here from Index: linux-2.6.26/arch/arm/kernel/smp.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/smp.c +++ linux-2.6.26/arch/arm/kernel/smp.c @@ -542,7 +542,7 @@ static void ipi_call_function(unsigned i cpu_clear(cpu, data->unfinished); } -static DEFINE_SPINLOCK(stop_lock); +static DEFINE_RAW_SPINLOCK(stop_lock); /* * ipi_cpu_stop - handle IPI from smp_send_stop() Index: linux-2.6.26/arch/arm/kernel/traps.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/traps.c +++ linux-2.6.26/arch/arm/kernel/traps.c @@ -225,7 +225,7 @@ static void __die(const char *str, int e } } -DEFINE_SPINLOCK(die_lock); +DEFINE_RAW_SPINLOCK(die_lock); /* * This function is protected against re-entrancy. @@ -268,7 +268,7 @@ void arm_notify_die(const char *str, str } static LIST_HEAD(undef_hook); -static DEFINE_SPINLOCK(undef_lock); +static DEFINE_RAW_SPINLOCK(undef_lock); void register_undef_hook(struct undef_hook *hook) { Index: linux-2.6.26/arch/arm/mm/consistent.c =================================================================== --- linux-2.6.26.orig/arch/arm/mm/consistent.c +++ linux-2.6.26/arch/arm/mm/consistent.c @@ -40,7 +40,7 @@ * These are the page tables (2MB each) covering uncached, DMA consistent allocations */ static pte_t *consistent_pte[NUM_CONSISTENT_PTES]; -static DEFINE_SPINLOCK(consistent_lock); +static DEFINE_RAW_SPINLOCK(consistent_lock); /* * VM region handling support. Index: linux-2.6.26/arch/arm/mm/copypage-v4mc.c =================================================================== --- linux-2.6.26.orig/arch/arm/mm/copypage-v4mc.c +++ linux-2.6.26/arch/arm/mm/copypage-v4mc.c @@ -30,7 +30,7 @@ #define minicache_pgprot __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | \ L_PTE_CACHEABLE) -static DEFINE_SPINLOCK(minicache_lock); +static DEFINE_RAW_SPINLOCK(minicache_lock); /* * ARMv4 mini-dcache optimised copy_user_page Index: linux-2.6.26/arch/arm/mm/copypage-v6.c =================================================================== --- linux-2.6.26.orig/arch/arm/mm/copypage-v6.c +++ linux-2.6.26/arch/arm/mm/copypage-v6.c @@ -26,7 +26,7 @@ #define from_address (0xffff8000) #define to_address (0xffffc000) -static DEFINE_SPINLOCK(v6_lock); +static DEFINE_RAW_SPINLOCK(v6_lock); /* * Copy the user page. No aliasing to deal with so we can just Index: linux-2.6.26/arch/arm/mm/copypage-xscale.c =================================================================== --- linux-2.6.26.orig/arch/arm/mm/copypage-xscale.c +++ linux-2.6.26/arch/arm/mm/copypage-xscale.c @@ -32,7 +32,7 @@ #define minicache_pgprot __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | \ L_PTE_CACHEABLE) -static DEFINE_SPINLOCK(minicache_lock); +static DEFINE_RAW_SPINLOCK(minicache_lock); /* * XScale mini-dcache optimised copy_user_page Index: linux-2.6.26/arch/arm/mm/mmu.c =================================================================== --- linux-2.6.26.orig/arch/arm/mm/mmu.c +++ linux-2.6.26/arch/arm/mm/mmu.c @@ -25,7 +25,7 @@ #include "mm.h" -DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); +DEFINE_PER_CPU_LOCKED(struct mmu_gather, mmu_gathers); extern void _stext, _etext, __data_start, _end; extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; Index: linux-2.6.26/include/asm-arm/dma.h =================================================================== --- linux-2.6.26.orig/include/asm-arm/dma.h +++ linux-2.6.26/include/asm-arm/dma.h @@ -27,7 +27,7 @@ typedef unsigned int dmamode_t; #define DMA_MODE_CASCADE 2 #define DMA_AUTOINIT 4 -extern spinlock_t dma_spin_lock; +extern raw_spinlock_t dma_spin_lock; static inline unsigned long claim_dma_lock(void) { Index: linux-2.6.26/include/asm-arm/futex.h =================================================================== --- linux-2.6.26.orig/include/asm-arm/futex.h +++ linux-2.6.26/include/asm-arm/futex.h @@ -7,7 +7,7 @@ #include #include -extern spinlock_t futex_atomic_lock; +extern raw_spinlock_t futex_atomic_lock; #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ __asm__ __volatile__ ( \ Index: linux-2.6.26/include/asm-arm/tlb.h =================================================================== --- linux-2.6.26.orig/include/asm-arm/tlb.h +++ linux-2.6.26/include/asm-arm/tlb.h @@ -36,15 +36,18 @@ struct mmu_gather { struct mm_struct *mm; unsigned int fullmm; + int cpu; }; -DECLARE_PER_CPU(struct mmu_gather, mmu_gathers); +DECLARE_PER_CPU_LOCKED(struct mmu_gather, mmu_gathers); static inline struct mmu_gather * tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush) { - struct mmu_gather *tlb = &get_cpu_var(mmu_gathers); + int cpu; + struct mmu_gather *tlb = &get_cpu_var_locked(mmu_gathers, &cpu); + tlb->cpu = cpu; tlb->mm = mm; tlb->fullmm = full_mm_flush; @@ -60,7 +63,7 @@ tlb_finish_mmu(struct mmu_gather *tlb, u /* keep the page table cache within bounds */ check_pgt_cache(); - put_cpu_var(mmu_gathers); + put_cpu_var_locked(mmu_gathers, tlb->cpu); } #define tlb_remove_tlb_entry(tlb,ptep,address) do { } while (0) patches/preempt-realtime-arm-rawlock-in-mmu_context-h.patch0000664000076400007640000000322511043564033023141 0ustar tglxtglxFrom khilman@mvista.com Fri Aug 31 05:09:03 2007 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.1.7-deb (2006-10-05) on debian X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=AWL autolearn=unavailable version=3.1.7-deb Received: from paris.hilman.org (deeprooted.net [216.254.16.51]) by mail.tglx.de (Postfix) with ESMTP id 1F21965C003 for ; Fri, 31 Aug 2007 05:09:03 +0200 (CEST) Received: by paris.hilman.org (Postfix, from userid 1000) id C5837E4C5FE; Thu, 30 Aug 2007 20:09:02 -0700 (PDT) Message-Id: <20070831030841.799694742@mvista.com> User-Agent: quilt/0.45-1 Date: Thu, 30 Aug 2007 20:08:41 -0700 From: Kevin Hilman To: Ingo Molnar , Thomas Gleixner Cc: LKML , RT-Users Subject: [PATCH 2.6.23-rc2-rt2] ARM: use raw lock in __new_context X-Evolution-Source: imap://tglx%40linutronix.de@localhost:8993/ Content-Transfer-Encoding: 8bit Mime-Version: 1.0 The ARM CPU ASID lock should be raw as it's used by schedule() when creating a new context. Signed-off-by: Kevin Hilman --- arch/arm/mm/context.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/arch/arm/mm/context.c =================================================================== --- linux-2.6.26.orig/arch/arm/mm/context.c +++ linux-2.6.26/arch/arm/mm/context.c @@ -14,7 +14,7 @@ #include #include -static DEFINE_SPINLOCK(cpu_asid_lock); +static DEFINE_RAW_SPINLOCK(cpu_asid_lock); unsigned int cpu_last_asid = ASID_FIRST_VERSION; /* patches/arm-trace-preempt-idle.patch0000664000076400007640000000520111043412046016507 0ustar tglxtglxFrom linux-rt-users-owner@vger.kernel.org Fri Jul 13 20:13:14 2007 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.1.7-deb (2006-10-05) on debian X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=AWL autolearn=unavailable version=3.1.7-deb Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by mail.tglx.de (Postfix) with ESMTP id 5902865C3EB; Fri, 13 Jul 2007 20:13:14 +0200 (CEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933095AbXGMSNN (ORCPT + 1 other); Fri, 13 Jul 2007 14:13:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933031AbXGMSNM (ORCPT ); Fri, 13 Jul 2007 14:13:12 -0400 Received: from deeprooted.net ([216.254.16.51]:38941 "EHLO paris.hilman.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1760089AbXGMSNH (ORCPT ); Fri, 13 Jul 2007 14:13:07 -0400 Received: by paris.hilman.org (Postfix, from userid 1000) id E61B1D2857A; Fri, 13 Jul 2007 10:52:28 -0700 (PDT) Message-Id: <20070713175228.623525155@mvista.com> References: <20070713175214.336577416@mvista.com> User-Agent: quilt/0.45-1 Date: Fri, 13 Jul 2007 10:52:18 -0700 From: Kevin Hilman To: tglx@linutronix.de, mingo@elte.hu Cc: linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH -rt 4/6] Add trace_preempt_*_idle() support for ARM. Content-Disposition: inline; filename=arm-trace-preempt-idle.patch Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk X-Mailing-List: linux-rt-users@vger.kernel.org X-Filter-To: .Kernel.rt-users X-Evolution-Source: imap://tglx%40linutronix.de@localhost:8993/ Content-Transfer-Encoding: 8bit Mime-Version: 1.0 Add trace functions to ARM idle loop and also move the tick_nohz_restart_sched_tick() after the local_irq_disable() as is done on x86. Signed-off-by: Kevin Hilman --- arch/arm/kernel/process.c | 2 ++ 1 file changed, 2 insertions(+) Index: linux-2.6.26/arch/arm/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/arm/kernel/process.c +++ linux-2.6.26/arch/arm/kernel/process.c @@ -166,6 +166,7 @@ void cpu_idle(void) if (!idle) idle = default_idle; leds_event(led_idle_start); + trace_preempt_exit_idle(); tick_nohz_stop_sched_tick(1); while (!need_resched()) idle(); @@ -175,6 +176,7 @@ void cpu_idle(void) __preempt_enable_no_resched(); __schedule(); preempt_disable(); + trace_preempt_enter_idle(); local_irq_enable(); } } patches/preempt-realtime-arm-bagde4.patch0000664000076400007640000000224411043564033017434 0ustar tglxtglx--- arch/arm/mach-sa1100/badge4.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) Index: linux-2.6.26/arch/arm/mach-sa1100/badge4.c =================================================================== --- linux-2.6.26.orig/arch/arm/mach-sa1100/badge4.c +++ linux-2.6.26/arch/arm/mach-sa1100/badge4.c @@ -240,15 +240,22 @@ void badge4_set_5V(unsigned subsystem, i /* detect on->off and off->on transitions */ if ((!old_5V_bitmap) && (badge4_5V_bitmap)) { /* was off, now on */ - printk(KERN_INFO "%s: enabling 5V supply rail\n", __func__); GPSR = BADGE4_GPIO_PCMEN5V; } else if ((old_5V_bitmap) && (!badge4_5V_bitmap)) { /* was on, now off */ - printk(KERN_INFO "%s: disabling 5V supply rail\n", __func__); GPCR = BADGE4_GPIO_PCMEN5V; } local_irq_restore(flags); + + /* detect on->off and off->on transitions */ + if ((!old_5V_bitmap) && (badge4_5V_bitmap)) { + /* was off, now on */ + printk(KERN_INFO "%s: enabling 5V supply rail\n", __FUNCTION__); + } else if ((old_5V_bitmap) && (!badge4_5V_bitmap)) { + /* was on, now off */ + printk(KERN_INFO "%s: disabling 5V supply rail\n", __FUNCTION__); + } } EXPORT_SYMBOL(badge4_set_5V); patches/preempt-realtime-arm-footbridge.patch0000664000076400007640000000221211043564033020425 0ustar tglxtglx--- arch/arm/mach-footbridge/netwinder-hw.c | 2 +- arch/arm/mach-footbridge/netwinder-leds.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6.26/arch/arm/mach-footbridge/netwinder-hw.c =================================================================== --- linux-2.6.26.orig/arch/arm/mach-footbridge/netwinder-hw.c +++ linux-2.6.26/arch/arm/mach-footbridge/netwinder-hw.c @@ -67,7 +67,7 @@ static inline void wb977_ww(int reg, int /* * This is a lock for accessing ports GP1_IO_BASE and GP2_IO_BASE */ -DEFINE_SPINLOCK(gpio_lock); +DEFINE_RAW_SPINLOCK(gpio_lock); static unsigned int current_gpio_op; static unsigned int current_gpio_io; Index: linux-2.6.26/arch/arm/mach-footbridge/netwinder-leds.c =================================================================== --- linux-2.6.26.orig/arch/arm/mach-footbridge/netwinder-leds.c +++ linux-2.6.26/arch/arm/mach-footbridge/netwinder-leds.c @@ -32,7 +32,7 @@ static char led_state; static char hw_led_state; static DEFINE_SPINLOCK(leds_lock); -extern spinlock_t gpio_lock; +extern raw_spinlock_t gpio_lock; static void netwinder_leds_event(led_event_t evt) { patches/preempt-realtime-arm-integrator.patch0000664000076400007640000000206111043564032020460 0ustar tglxtglx--- arch/arm/mach-integrator/core.c | 2 +- arch/arm/mach-integrator/pci_v3.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6.26/arch/arm/mach-integrator/core.c =================================================================== --- linux-2.6.26.orig/arch/arm/mach-integrator/core.c +++ linux-2.6.26/arch/arm/mach-integrator/core.c @@ -164,7 +164,7 @@ static struct amba_pl010_data integrator #define CM_CTRL IO_ADDRESS(INTEGRATOR_HDR_BASE) + INTEGRATOR_HDR_CTRL_OFFSET -static DEFINE_SPINLOCK(cm_lock); +static DEFINE_RAW_SPINLOCK(cm_lock); /** * cm_control - update the CM_CTRL register. Index: linux-2.6.26/arch/arm/mach-integrator/pci_v3.c =================================================================== --- linux-2.6.26.orig/arch/arm/mach-integrator/pci_v3.c +++ linux-2.6.26/arch/arm/mach-integrator/pci_v3.c @@ -162,7 +162,7 @@ * 7:2 register number * */ -static DEFINE_SPINLOCK(v3_lock); +static DEFINE_RAW_SPINLOCK(v3_lock); #define PCI_BUS_NONMEM_START 0x00000000 #define PCI_BUS_NONMEM_SIZE SZ_256M patches/preempt-realtime-arm-ixp4xx.patch0000664000076400007640000000114611043564032017551 0ustar tglxtglx--- arch/arm/mach-ixp4xx/common-pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/arch/arm/mach-ixp4xx/common-pci.c =================================================================== --- linux-2.6.26.orig/arch/arm/mach-ixp4xx/common-pci.c +++ linux-2.6.26/arch/arm/mach-ixp4xx/common-pci.c @@ -53,7 +53,7 @@ unsigned long ixp4xx_pci_reg_base = 0; * these transactions are atomic or we will end up * with corrupt data on the bus or in a driver. */ -static DEFINE_SPINLOCK(ixp4xx_pci_lock); +static DEFINE_RAW_SPINLOCK(ixp4xx_pci_lock); /* * Read from PCI config space patches/preempt-realtime-arm-pxa.patch0000664000076400007640000000152411043564032017075 0ustar tglxtglx--- include/asm-arm/arch-pxa/timex.h | 6 ++++++ 1 file changed, 6 insertions(+) Index: linux-2.6.26/include/asm-arm/arch-pxa/timex.h =================================================================== --- linux-2.6.26.orig/include/asm-arm/arch-pxa/timex.h +++ linux-2.6.26/include/asm-arm/arch-pxa/timex.h @@ -16,6 +16,8 @@ #define CLOCK_TICK_RATE 3686400 #elif defined(CONFIG_PXA27x) /* PXA27x timer base */ +#include +#include #ifdef CONFIG_MACH_MAINSTONE #define CLOCK_TICK_RATE 3249600 #else @@ -24,3 +26,7 @@ #else #define CLOCK_TICK_RATE 3250000 #endif + +#define mach_read_cycles() OSCR +#define mach_cycles_to_usecs(d) (((d) * ((1000000LL << 32) / CLOCK_TICK_RATE)) >> 32) +#define mach_usecs_to_cycles(d) (((d) * (((long long)CLOCK_TICK_RATE << 32) / 1000000)) >> 32) patches/preempt-realtime-arm-shark.patch0000664000076400007640000000101611043564032017411 0ustar tglxtglx--- arch/arm/mach-shark/leds.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/arch/arm/mach-shark/leds.c =================================================================== --- linux-2.6.26.orig/arch/arm/mach-shark/leds.c +++ linux-2.6.26/arch/arm/mach-shark/leds.c @@ -32,7 +32,7 @@ static char led_state; static short hw_led_state; static short saved_state; -static DEFINE_SPINLOCK(leds_lock); +static DEFINE_RAW_SPINLOCK(leds_lock); short sequoia_read(int addr) { outw(addr,0x24); patches/preempt-realtime-mips.patch0000664000076400007640000007100011043564032016474 0ustar tglxtglx arch/mips/Kconfig | 12 +- arch/mips/kernel/asm-offsets.c | 3 arch/mips/kernel/entry.S | 20 ++-- arch/mips/kernel/i8259.c | 2 arch/mips/kernel/module.c | 2 arch/mips/kernel/process.c | 6 - arch/mips/kernel/scall32-o32.S | 2 arch/mips/kernel/scall64-64.S | 2 arch/mips/kernel/scall64-n32.S | 2 arch/mips/kernel/scall64-o32.S | 2 arch/mips/kernel/signal.c | 4 arch/mips/kernel/signal32.c | 4 arch/mips/kernel/smp.c | 27 +++++ arch/mips/kernel/traps.c | 2 arch/mips/mm/init.c | 2 arch/mips/sibyte/sb1250/irq.c | 6 + arch/mips/sibyte/sb1250/smp.c | 2 arch/mips/sibyte/swarm/setup.c | 6 + include/asm-mips/asmmacro.h | 8 - include/asm-mips/atomic.h | 1 include/asm-mips/bitops.h | 5 - include/asm-mips/hw_irq.h | 1 include/asm-mips/i8259.h | 2 include/asm-mips/io.h | 1 include/asm-mips/linkage.h | 5 + include/asm-mips/m48t35.h | 2 include/asm-mips/rwsem.h | 176 ++++++++++++++++++++++++++++++++++++++ include/asm-mips/spinlock.h | 18 +-- include/asm-mips/spinlock_types.h | 4 include/asm-mips/time.h | 2 include/asm-mips/timeofday.h | 5 + include/asm-mips/uaccess.h | 12 -- 32 files changed, 291 insertions(+), 57 deletions(-) Index: linux-2.6.26/arch/mips/Kconfig =================================================================== --- linux-2.6.26.orig/arch/mips/Kconfig +++ linux-2.6.26/arch/mips/Kconfig @@ -708,16 +708,13 @@ config GENERIC_LOCKBREAK config RWSEM_GENERIC_SPINLOCK bool - depends on !PREEMPT_RT default y config RWSEM_XCHGADD_ALGORITHM bool - depends on !PREEMPT_RT config ASM_SEMAPHORES bool -# depends on !PREEMPT_RT default y config ARCH_HAS_ILOG2_U32 @@ -1973,6 +1970,15 @@ config SECCOMP If unsure, say Y. Only embedded should say N here. +config GENERIC_TIME + bool + default y + +source "kernel/time/Kconfig" + +config CPU_SPEED + int "CPU speed used for clocksource/clockevent calculations" + default 600 endmenu config LOCKDEP_SUPPORT Index: linux-2.6.26/arch/mips/kernel/asm-offsets.c =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/asm-offsets.c +++ linux-2.6.26/arch/mips/kernel/asm-offsets.c @@ -10,10 +10,13 @@ */ #include #include +#include #include #include #include #include +#include + #include #include Index: linux-2.6.26/arch/mips/kernel/entry.S =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/entry.S +++ linux-2.6.26/arch/mips/kernel/entry.S @@ -30,7 +30,7 @@ .align 5 #ifndef CONFIG_PREEMPT FEXPORT(ret_from_exception) - local_irq_disable # preempt stop + raw_local_irq_disable # preempt stop b __ret_from_irq #endif FEXPORT(ret_from_irq) @@ -41,7 +41,7 @@ FEXPORT(__ret_from_irq) beqz t0, resume_kernel resume_userspace: - local_irq_disable # make sure we dont miss an + raw_local_irq_disable # make sure we dont miss an # interrupt setting need_resched # between sampling and return LONG_L a2, TI_FLAGS($28) # current->work @@ -51,7 +51,9 @@ resume_userspace: #ifdef CONFIG_PREEMPT resume_kernel: - local_irq_disable + raw_local_irq_disable + lw t0, kernel_preemption + beqz t0, restore_all lw t0, TI_PRE_COUNT($28) bnez t0, restore_all need_resched: @@ -61,7 +63,9 @@ need_resched: LONG_L t0, PT_STATUS(sp) # Interrupts off? andi t0, 1 beqz t0, restore_all + raw_local_irq_disable jal preempt_schedule_irq + sw zero, TI_PRE_COUNT($28) b need_resched #endif @@ -69,7 +73,7 @@ FEXPORT(ret_from_fork) jal schedule_tail # a0 = struct task_struct *prev FEXPORT(syscall_exit) - local_irq_disable # make sure need_resched and + raw_local_irq_disable # make sure need_resched and # signals dont change between # sampling and return LONG_L a2, TI_FLAGS($28) # current->work @@ -142,12 +146,14 @@ FEXPORT(restore_partial) # restore part .set at work_pending: - andi t0, a2, _TIF_NEED_RESCHED # a2 is preloaded with TI_FLAGS + # a2 is preloaded with TI_FLAGS + andi t0, a2, _TIF_NEED_RESCHED beqz t0, work_notifysig work_resched: + raw_local_irq_enable t0 jal schedule - local_irq_disable # make sure need_resched and + raw_local_irq_disable # make sure need_resched and # signals dont change between # sampling and return LONG_L a2, TI_FLAGS($28) @@ -170,7 +176,7 @@ syscall_exit_work: li t0, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT and t0, a2 # a2 is preloaded with TI_FLAGS beqz t0, work_pending # trace bit set? - local_irq_enable # could let do_syscall_trace() + raw_local_irq_enable # could let do_syscall_trace() # call schedule() instead move a0, sp li a1, 1 Index: linux-2.6.26/arch/mips/kernel/i8259.c =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/i8259.c +++ linux-2.6.26/arch/mips/kernel/i8259.c @@ -29,7 +29,7 @@ */ static int i8259A_auto_eoi = -1; -DEFINE_SPINLOCK(i8259A_lock); +DEFINE_RAW_SPINLOCK(i8259A_lock); static void disable_8259A_irq(unsigned int irq); static void enable_8259A_irq(unsigned int irq); static void mask_and_ack_8259A(unsigned int irq); Index: linux-2.6.26/arch/mips/kernel/module.c =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/module.c +++ linux-2.6.26/arch/mips/kernel/module.c @@ -40,7 +40,7 @@ struct mips_hi16 { static struct mips_hi16 *mips_hi16_list; static LIST_HEAD(dbe_list); -static DEFINE_SPINLOCK(dbe_lock); +static DEFINE_RAW_SPINLOCK(dbe_lock); void *module_alloc(unsigned long size) { Index: linux-2.6.26/arch/mips/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/process.c +++ linux-2.6.26/arch/mips/kernel/process.c @@ -64,9 +64,11 @@ void __noreturn cpu_idle(void) (*cpu_wait)(); } tick_nohz_restart_sched_tick(); - preempt_enable_no_resched(); - schedule(); + local_irq_disable(); + __preempt_enable_no_resched(); + __schedule(); preempt_disable(); + local_irq_enable(); } } Index: linux-2.6.26/arch/mips/kernel/scall32-o32.S =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/scall32-o32.S +++ linux-2.6.26/arch/mips/kernel/scall32-o32.S @@ -73,7 +73,7 @@ stack_done: 1: sw v0, PT_R2(sp) # result o32_syscall_exit: - local_irq_disable # make sure need_resched and + raw_local_irq_disable # make sure need_resched and # signals dont change between # sampling and return lw a2, TI_FLAGS($28) # current->work Index: linux-2.6.26/arch/mips/kernel/scall64-64.S =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/scall64-64.S +++ linux-2.6.26/arch/mips/kernel/scall64-64.S @@ -72,7 +72,7 @@ NESTED(handle_sys64, PT_SIZE, sp) 1: sd v0, PT_R2(sp) # result n64_syscall_exit: - local_irq_disable # make sure need_resched and + raw_local_irq_disable # make sure need_resched and # signals dont change between # sampling and return LONG_L a2, TI_FLAGS($28) # current->work Index: linux-2.6.26/arch/mips/kernel/scall64-n32.S =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/scall64-n32.S +++ linux-2.6.26/arch/mips/kernel/scall64-n32.S @@ -69,7 +69,7 @@ NESTED(handle_sysn32, PT_SIZE, sp) sd v0, PT_R0(sp) # set flag for syscall restarting 1: sd v0, PT_R2(sp) # result - local_irq_disable # make sure need_resched and + raw_local_irq_disable # make sure need_resched and # signals dont change between # sampling and return LONG_L a2, TI_FLAGS($28) # current->work Index: linux-2.6.26/arch/mips/kernel/scall64-o32.S =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/scall64-o32.S +++ linux-2.6.26/arch/mips/kernel/scall64-o32.S @@ -98,7 +98,7 @@ NESTED(handle_sys, PT_SIZE, sp) 1: sd v0, PT_R2(sp) # result o32_syscall_exit: - local_irq_disable # make need_resched and + raw_local_irq_disable # make need_resched and # signals dont change between # sampling and return LONG_L a2, TI_FLAGS($28) Index: linux-2.6.26/arch/mips/kernel/signal.c =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/signal.c +++ linux-2.6.26/arch/mips/kernel/signal.c @@ -629,6 +629,10 @@ static void do_signal(struct pt_regs *re siginfo_t info; int signr; +#ifdef CONFIG_PREEMPT_RT + local_irq_enable(); + preempt_check_resched(); +#endif /* * We want the common case to go fast, which is why we may in certain * cases get here from kernel mode. Just return without doing anything Index: linux-2.6.26/arch/mips/kernel/signal32.c =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/signal32.c +++ linux-2.6.26/arch/mips/kernel/signal32.c @@ -655,6 +655,10 @@ static int setup_rt_frame_32(struct k_si if (err) goto give_sigsegv; +#ifdef CONFIG_PREEMPT_RT + local_irq_enable(); + preempt_check_resched(); +#endif /* * Arguments to signal handler: * Index: linux-2.6.26/arch/mips/kernel/smp.c =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/smp.c +++ linux-2.6.26/arch/mips/kernel/smp.c @@ -131,7 +131,22 @@ asmlinkage __cpuinit void start_secondar cpu_idle(); } -DEFINE_SPINLOCK(smp_call_lock); +DEFINE_RAW_SPINLOCK(smp_call_lock); + +/* + * this function sends a 'reschedule' IPI to all other CPUs. + * This is used when RT tasks are starving and other CPUs + * might be able to run them. + */ +void smp_send_reschedule_allbutself(void) +{ + int cpu = smp_processor_id(); + int i; + + for (i = 0; i < NR_CPUS; i++) + if (cpu_online(i) && i != cpu) + core_send_ipi(i, SMP_RESCHEDULE_YOURSELF); +} struct call_data_struct *call_data; @@ -358,6 +373,8 @@ int setup_profiling_timer(unsigned int m return 0; } +static DEFINE_RAW_SPINLOCK(tlbstate_lock); + static void flush_tlb_all_ipi(void *info) { local_flush_tlb_all(); @@ -415,6 +432,7 @@ static inline void smp_on_each_tlb(void void flush_tlb_mm(struct mm_struct *mm) { preempt_disable(); + spin_lock(&tlbstate_lock); if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) { smp_on_other_tlbs(flush_tlb_mm_ipi, mm); @@ -427,6 +445,7 @@ void flush_tlb_mm(struct mm_struct *mm) if (cpu_context(cpu, mm)) cpu_context(cpu, mm) = 0; } + spin_unlock(&tlbstate_lock); local_flush_tlb_mm(mm); preempt_enable(); @@ -450,6 +469,8 @@ void flush_tlb_range(struct vm_area_stru struct mm_struct *mm = vma->vm_mm; preempt_disable(); + spin_lock(&tlbstate_lock); + if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) { struct flush_tlb_data fd = { .vma = vma, @@ -467,6 +488,7 @@ void flush_tlb_range(struct vm_area_stru if (cpu_context(cpu, mm)) cpu_context(cpu, mm) = 0; } + spin_unlock(&tlbstate_lock); local_flush_tlb_range(vma, start, end); preempt_enable(); } @@ -498,6 +520,8 @@ static void flush_tlb_page_ipi(void *inf void flush_tlb_page(struct vm_area_struct *vma, unsigned long page) { preempt_disable(); + spin_lock(&tlbstate_lock); + if ((atomic_read(&vma->vm_mm->mm_users) != 1) || (current->mm != vma->vm_mm)) { struct flush_tlb_data fd = { .vma = vma, @@ -514,6 +538,7 @@ void flush_tlb_page(struct vm_area_struc if (cpu_context(cpu, vma->vm_mm)) cpu_context(cpu, vma->vm_mm) = 0; } + spin_unlock(&tlbstate_lock); local_flush_tlb_page(vma, page); preempt_enable(); } Index: linux-2.6.26/arch/mips/kernel/traps.c =================================================================== --- linux-2.6.26.orig/arch/mips/kernel/traps.c +++ linux-2.6.26/arch/mips/kernel/traps.c @@ -340,7 +340,7 @@ void show_registers(const struct pt_regs printk("\n"); } -static DEFINE_SPINLOCK(die_lock); +static DEFINE_RAW_SPINLOCK(die_lock); void __noreturn die(const char * str, const struct pt_regs * regs) { Index: linux-2.6.26/arch/mips/mm/init.c =================================================================== --- linux-2.6.26.orig/arch/mips/mm/init.c +++ linux-2.6.26/arch/mips/mm/init.c @@ -61,7 +61,7 @@ #endif /* CONFIG_MIPS_MT_SMTC */ -DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); +DEFINE_PER_CPU_LOCKED(struct mmu_gather, mmu_gathers); /* * We have up to 8 empty zeroed pages so we can map one of the right colour Index: linux-2.6.26/arch/mips/sibyte/sb1250/irq.c =================================================================== --- linux-2.6.26.orig/arch/mips/sibyte/sb1250/irq.c +++ linux-2.6.26/arch/mips/sibyte/sb1250/irq.c @@ -82,7 +82,7 @@ static struct irq_chip sb1250_irq_type = /* Store the CPU id (not the logical number) */ int sb1250_irq_owner[SB1250_NR_IRQS]; -DEFINE_SPINLOCK(sb1250_imr_lock); +DEFINE_RAW_SPINLOCK(sb1250_imr_lock); void sb1250_mask_irq(int cpu, int irq) { @@ -316,6 +316,10 @@ void __init arch_init_irq(void) #ifdef CONFIG_KGDB imask |= STATUSF_IP6; #endif + +#ifdef CONFIG_HIGH_RES_TIMERS + imask |= STATUSF_IP7; +#endif /* Enable necessary IPs, disable the rest */ change_c0_status(ST0_IM, imask); Index: linux-2.6.26/arch/mips/sibyte/sb1250/smp.c =================================================================== --- linux-2.6.26.orig/arch/mips/sibyte/sb1250/smp.c +++ linux-2.6.26/arch/mips/sibyte/sb1250/smp.c @@ -97,7 +97,7 @@ static void __cpuinit sb1250_smp_finish( extern void sb1250_clockevent_init(void); sb1250_clockevent_init(); - local_irq_enable(); + raw_local_irq_enable(); } /* Index: linux-2.6.26/arch/mips/sibyte/swarm/setup.c =================================================================== --- linux-2.6.26.orig/arch/mips/sibyte/swarm/setup.c +++ linux-2.6.26/arch/mips/sibyte/swarm/setup.c @@ -136,6 +136,12 @@ void __init plat_mem_setup(void) if (m41t81_probe()) swarm_rtc_type = RTC_M4LT81; +#ifdef CONFIG_HIGH_RES_TIMERS + /* + * set the mips_hpt_frequency here + */ + mips_hpt_frequency = CONFIG_CPU_SPEED * 1000000; +#endif printk("This kernel optimized for " #ifdef CONFIG_SIMULATION "simulation" Index: linux-2.6.26/include/asm-mips/asmmacro.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/asmmacro.h +++ linux-2.6.26/include/asm-mips/asmmacro.h @@ -21,7 +21,7 @@ #endif #ifdef CONFIG_MIPS_MT_SMTC - .macro local_irq_enable reg=t0 + .macro raw_local_irq_enable reg=t0 mfc0 \reg, CP0_TCSTATUS ori \reg, \reg, TCSTATUS_IXMT xori \reg, \reg, TCSTATUS_IXMT @@ -29,21 +29,21 @@ _ehb .endm - .macro local_irq_disable reg=t0 + .macro raw_local_irq_disable reg=t0 mfc0 \reg, CP0_TCSTATUS ori \reg, \reg, TCSTATUS_IXMT mtc0 \reg, CP0_TCSTATUS _ehb .endm #else - .macro local_irq_enable reg=t0 + .macro raw_local_irq_enable reg=t0 mfc0 \reg, CP0_STATUS ori \reg, \reg, 1 mtc0 \reg, CP0_STATUS irq_enable_hazard .endm - .macro local_irq_disable reg=t0 + .macro raw_local_irq_disable reg=t0 mfc0 \reg, CP0_STATUS ori \reg, \reg, 1 xori \reg, \reg, 1 Index: linux-2.6.26/include/asm-mips/atomic.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/atomic.h +++ linux-2.6.26/include/asm-mips/atomic.h @@ -573,7 +573,6 @@ static __inline__ long atomic64_add_retu raw_local_irq_restore(flags); } #endif -#endif smp_llsc_mb(); Index: linux-2.6.26/include/asm-mips/bitops.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/bitops.h +++ linux-2.6.26/include/asm-mips/bitops.h @@ -606,9 +606,6 @@ static inline unsigned long __ffs(unsign } /* - * fls - find last bit set. - * @word: The word to search - * * This is defined the same way as ffs. * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. */ @@ -626,6 +623,8 @@ static inline int fls64(__u64 word) return 64 - word; } +#define __bi_local_irq_save(x) raw_local_irq_save(x) +#define __bi_local_irq_restore(x) raw_local_irq_restore(x) #else #include #endif Index: linux-2.6.26/include/asm-mips/hw_irq.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/hw_irq.h +++ linux-2.6.26/include/asm-mips/hw_irq.h @@ -9,6 +9,7 @@ #define __ASM_HW_IRQ_H #include +#include extern atomic_t irq_err_count; Index: linux-2.6.26/include/asm-mips/i8259.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/i8259.h +++ linux-2.6.26/include/asm-mips/i8259.h @@ -35,7 +35,7 @@ #define SLAVE_ICW4_DEFAULT 0x01 #define PIC_ICW4_AEOI 2 -extern spinlock_t i8259A_lock; +extern raw_spinlock_t i8259A_lock; extern int i8259A_irq_pending(unsigned int irq); extern void make_8259A_irq(unsigned int irq); Index: linux-2.6.26/include/asm-mips/io.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/io.h +++ linux-2.6.26/include/asm-mips/io.h @@ -15,6 +15,7 @@ #include #include #include +#include #include #include Index: linux-2.6.26/include/asm-mips/linkage.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/linkage.h +++ linux-2.6.26/include/asm-mips/linkage.h @@ -3,6 +3,11 @@ #ifdef __ASSEMBLY__ #include + +/* stuff */ +#define (x) x +#define + #endif #define __weak __attribute__((weak)) Index: linux-2.6.26/include/asm-mips/m48t35.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/m48t35.h +++ linux-2.6.26/include/asm-mips/m48t35.h @@ -6,7 +6,7 @@ #include -extern spinlock_t rtc_lock; +extern raw_spinlock_t rtc_lock; struct m48t35_rtc { volatile u8 pad[0x7ff8]; /* starts at 0x7ff8 */ Index: linux-2.6.26/include/asm-mips/rwsem.h =================================================================== --- /dev/null +++ linux-2.6.26/include/asm-mips/rwsem.h @@ -0,0 +1,176 @@ +/* + * include/asm-mips/rwsem.h: R/W semaphores for MIPS using the stuff + * in lib/rwsem.c. Adapted largely from include/asm-ppc/rwsem.h + * by john.cooper@timesys.com + */ + +#ifndef _MIPS_RWSEM_H +#define _MIPS_RWSEM_H + +#ifndef _LINUX_RWSEM_H +#error "please don't include asm/rwsem.h directly, use linux/rwsem.h instead" +#endif + +#ifdef __KERNEL__ +#include +#include +#include +#include + +/* + * the semaphore definition + */ +struct compat_rw_semaphore { + /* XXX this should be able to be an atomic_t -- paulus */ + signed long count; +#define RWSEM_UNLOCKED_VALUE 0x00000000 +#define RWSEM_ACTIVE_BIAS 0x00000001 +#define RWSEM_ACTIVE_MASK 0x0000ffff +#define RWSEM_WAITING_BIAS (-0x00010000) +#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS +#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS) + raw_spinlock_t wait_lock; + struct list_head wait_list; +#if RWSEM_DEBUG + int debug; +#endif +}; + +/* + * initialisation + */ +#if RWSEM_DEBUG +#define __RWSEM_DEBUG_INIT , 0 +#else +#define __RWSEM_DEBUG_INIT /* */ +#endif + +#define __COMPAT_RWSEM_INITIALIZER(name) \ + { RWSEM_UNLOCKED_VALUE, SPIN_LOCK_UNLOCKED, \ + LIST_HEAD_INIT((name).wait_list) \ + __RWSEM_DEBUG_INIT } + +#define COMPAT_DECLARE_RWSEM(name) \ + struct compat_rw_semaphore name = __COMPAT_RWSEM_INITIALIZER(name) + +extern struct compat_rw_semaphore *rwsem_down_read_failed(struct compat_rw_semaphore *sem); +extern struct compat_rw_semaphore *rwsem_down_write_failed(struct compat_rw_semaphore *sem); +extern struct compat_rw_semaphore *rwsem_wake(struct compat_rw_semaphore *sem); +extern struct compat_rw_semaphore *rwsem_downgrade_wake(struct compat_rw_semaphore *sem); + +static inline void compat_init_rwsem(struct compat_rw_semaphore *sem) +{ + sem->count = RWSEM_UNLOCKED_VALUE; + spin_lock_init(&sem->wait_lock); + INIT_LIST_HEAD(&sem->wait_list); +#if RWSEM_DEBUG + sem->debug = 0; +#endif +} + +/* + * lock for reading + */ +static inline void __down_read(struct compat_rw_semaphore *sem) +{ + if (atomic_inc_return((atomic_t *)(&sem->count)) > 0) + smp_wmb(); + else + rwsem_down_read_failed(sem); +} + +static inline int __down_read_trylock(struct compat_rw_semaphore *sem) +{ + int tmp; + + while ((tmp = sem->count) >= 0) { + if (tmp == cmpxchg(&sem->count, tmp, + tmp + RWSEM_ACTIVE_READ_BIAS)) { + smp_wmb(); + return 1; + } + } + return 0; +} + +/* + * lock for writing + */ +static inline void __down_write(struct compat_rw_semaphore *sem) +{ + int tmp; + + tmp = atomic_add_return(RWSEM_ACTIVE_WRITE_BIAS, + (atomic_t *)(&sem->count)); + if (tmp == RWSEM_ACTIVE_WRITE_BIAS) + smp_wmb(); + else + rwsem_down_write_failed(sem); +} + +static inline int __down_write_trylock(struct compat_rw_semaphore *sem) +{ + int tmp; + + tmp = cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE, + RWSEM_ACTIVE_WRITE_BIAS); + smp_wmb(); + return tmp == RWSEM_UNLOCKED_VALUE; +} + +/* + * unlock after reading + */ +static inline void __up_read(struct compat_rw_semaphore *sem) +{ + int tmp; + + smp_wmb(); + tmp = atomic_dec_return((atomic_t *)(&sem->count)); + if (tmp < -1 && (tmp & RWSEM_ACTIVE_MASK) == 0) + rwsem_wake(sem); +} + +/* + * unlock after writing + */ +static inline void __up_write(struct compat_rw_semaphore *sem) +{ + smp_wmb(); + if (atomic_sub_return(RWSEM_ACTIVE_WRITE_BIAS, + (atomic_t *)(&sem->count)) < 0) + rwsem_wake(sem); +} + +/* + * implement atomic add functionality + */ +static inline void rwsem_atomic_add(int delta, struct compat_rw_semaphore *sem) +{ + atomic_add(delta, (atomic_t *)(&sem->count)); +} + +/* + * downgrade write lock to read lock + */ +static inline void __downgrade_write(struct compat_rw_semaphore *sem) +{ + int tmp; + + smp_wmb(); + tmp = atomic_add_return(-RWSEM_WAITING_BIAS, (atomic_t *)(&sem->count)); + if (tmp < 0) + rwsem_downgrade_wake(sem); +} + +/* + * implement exchange and add functionality + */ +static inline int rwsem_atomic_update(int delta, struct compat_rw_semaphore *sem) +{ + smp_mb(); + return atomic_add_return(delta, (atomic_t *)(&sem->count)); +} + +#endif /* __KERNEL__ */ +#endif /* _MIPS_RWSEM_H */ Index: linux-2.6.26/include/asm-mips/spinlock.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/spinlock.h +++ linux-2.6.26/include/asm-mips/spinlock.h @@ -28,7 +28,7 @@ * We make no fairness assumptions. They have a cost. */ -static inline void __raw_spin_lock(raw_spinlock_t *lock) +static inline void __raw_spin_lock(__raw_spinlock_t *lock) { unsigned int tmp; @@ -70,7 +70,7 @@ static inline void __raw_spin_lock(raw_s smp_llsc_mb(); } -static inline void __raw_spin_unlock(raw_spinlock_t *lock) +static inline void __raw_spin_unlock(__raw_spinlock_t *lock) { smp_mb(); @@ -83,7 +83,7 @@ static inline void __raw_spin_unlock(raw : "memory"); } -static inline unsigned int __raw_spin_trylock(raw_spinlock_t *lock) +static inline unsigned int __raw_spin_trylock(__raw_spinlock_t *lock) { unsigned int temp, res; @@ -144,7 +144,7 @@ static inline unsigned int __raw_spin_tr */ #define __raw_write_can_lock(rw) (!(rw)->lock) -static inline void __raw_read_lock(raw_rwlock_t *rw) +static inline void __raw_read_lock(__raw_rwlock_t *rw) { unsigned int tmp; @@ -189,7 +189,7 @@ static inline void __raw_read_lock(raw_r /* Note the use of sub, not subu which will make the kernel die with an overflow exception if we ever try to unlock an rwlock that is already unlocked or is being held by a writer. */ -static inline void __raw_read_unlock(raw_rwlock_t *rw) +static inline void __raw_read_unlock(__raw_rwlock_t *rw) { unsigned int tmp; @@ -223,7 +223,7 @@ static inline void __raw_read_unlock(raw } } -static inline void __raw_write_lock(raw_rwlock_t *rw) +static inline void __raw_write_lock(__raw_rwlock_t *rw) { unsigned int tmp; @@ -265,7 +265,7 @@ static inline void __raw_write_lock(raw_ smp_llsc_mb(); } -static inline void __raw_write_unlock(raw_rwlock_t *rw) +static inline void __raw_write_unlock(__raw_rwlock_t *rw) { smp_mb(); @@ -277,7 +277,7 @@ static inline void __raw_write_unlock(ra : "memory"); } -static inline int __raw_read_trylock(raw_rwlock_t *rw) +static inline int __raw_read_trylock(__raw_rwlock_t *rw) { unsigned int tmp; int ret; @@ -321,7 +321,7 @@ static inline int __raw_read_trylock(raw return ret; } -static inline int __raw_write_trylock(raw_rwlock_t *rw) +static inline int __raw_write_trylock(__raw_rwlock_t *rw) { unsigned int tmp; int ret; Index: linux-2.6.26/include/asm-mips/spinlock_types.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/spinlock_types.h +++ linux-2.6.26/include/asm-mips/spinlock_types.h @@ -7,13 +7,13 @@ typedef struct { volatile unsigned int lock; -} raw_spinlock_t; +} __raw_spinlock_t; #define __RAW_SPIN_LOCK_UNLOCKED { 0 } typedef struct { volatile unsigned int lock; -} raw_rwlock_t; +} __raw_rwlock_t; #define __RAW_RW_LOCK_UNLOCKED { 0 } Index: linux-2.6.26/include/asm-mips/time.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/time.h +++ linux-2.6.26/include/asm-mips/time.h @@ -19,7 +19,7 @@ #include #include -extern spinlock_t rtc_lock; +extern raw_spinlock_t rtc_lock; /* * RTC ops. By default, they point to weak no-op RTC functions. Index: linux-2.6.26/include/asm-mips/timeofday.h =================================================================== --- /dev/null +++ linux-2.6.26/include/asm-mips/timeofday.h @@ -0,0 +1,5 @@ +#ifndef _ASM_MIPS_TIMEOFDAY_H +#define _ASM_MIPS_TIMEOFDAY_H +#include +#endif + Index: linux-2.6.26/include/asm-mips/uaccess.h =================================================================== --- linux-2.6.26.orig/include/asm-mips/uaccess.h +++ linux-2.6.26/include/asm-mips/uaccess.h @@ -434,7 +434,6 @@ extern size_t __copy_user(void *__to, co const void *__cu_from; \ long __cu_len; \ \ - might_sleep(); \ __cu_to = (to); \ __cu_from = (from); \ __cu_len = (n); \ @@ -490,7 +489,6 @@ extern size_t __copy_user_inatomic(void const void *__cu_from; \ long __cu_len; \ \ - might_sleep(); \ __cu_to = (to); \ __cu_from = (from); \ __cu_len = (n); \ @@ -569,7 +567,6 @@ extern size_t __copy_user_inatomic(void const void __user *__cu_from; \ long __cu_len; \ \ - might_sleep(); \ __cu_to = (to); \ __cu_from = (from); \ __cu_len = (n); \ @@ -600,7 +597,6 @@ extern size_t __copy_user_inatomic(void const void __user *__cu_from; \ long __cu_len; \ \ - might_sleep(); \ __cu_to = (to); \ __cu_from = (from); \ __cu_len = (n); \ @@ -618,7 +614,6 @@ extern size_t __copy_user_inatomic(void const void __user *__cu_from; \ long __cu_len; \ \ - might_sleep(); \ __cu_to = (to); \ __cu_from = (from); \ __cu_len = (n); \ @@ -645,7 +640,6 @@ __clear_user(void __user *addr, __kernel { __kernel_size_t res; - might_sleep(); __asm__ __volatile__( "move\t$4, %1\n\t" "move\t$5, $0\n\t" @@ -694,7 +688,6 @@ __strncpy_from_user(char *__to, const ch { long res; - might_sleep(); __asm__ __volatile__( "move\t$4, %1\n\t" "move\t$5, %2\n\t" @@ -731,7 +724,6 @@ strncpy_from_user(char *__to, const char { long res; - might_sleep(); __asm__ __volatile__( "move\t$4, %1\n\t" "move\t$5, %2\n\t" @@ -750,7 +742,6 @@ static inline long __strlen_user(const c { long res; - might_sleep(); __asm__ __volatile__( "move\t$4, %1\n\t" __MODULE_JAL(__strlen_user_nocheck_asm) @@ -780,7 +771,6 @@ static inline long strlen_user(const cha { long res; - might_sleep(); __asm__ __volatile__( "move\t$4, %1\n\t" __MODULE_JAL(__strlen_user_asm) @@ -797,7 +787,6 @@ static inline long __strnlen_user(const { long res; - might_sleep(); __asm__ __volatile__( "move\t$4, %1\n\t" "move\t$5, %2\n\t" @@ -828,7 +817,6 @@ static inline long strnlen_user(const ch { long res; - might_sleep(); __asm__ __volatile__( "move\t$4, %1\n\t" "move\t$5, %2\n\t" patches/preempt-realtime-x86_64.patch0000664000076400007640000002561711043564031016476 0ustar tglxtglx arch/x86/kernel/early_printk.c | 2 +- arch/x86/kernel/head64.c | 6 +++++- arch/x86/kernel/i8259_64.c | 2 +- arch/x86/kernel/io_apic_64.c | 13 +++++++------ arch/x86/kernel/nmi_64.c | 2 ++ arch/x86/kernel/process_64.c | 9 ++++++--- arch/x86/kernel/signal_64.c | 7 +++++++ arch/x86/kernel/smp.c | 12 +++++++++++- arch/x86/kernel/tlb_64.c | 2 +- arch/x86/kernel/traps_64.c | 5 ++--- include/asm-x86/acpi.h | 4 ++-- include/asm-x86/hw_irq_64.h | 2 +- include/asm-x86/i8259.h | 2 +- include/asm-x86/spinlock.h | 6 +++--- include/asm-x86/tlbflush.h | 2 ++ include/asm-x86/vgtod.h | 2 +- 16 files changed, 53 insertions(+), 25 deletions(-) Index: linux-2.6.26/arch/x86/kernel/early_printk.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/early_printk.c +++ linux-2.6.26/arch/x86/kernel/early_printk.c @@ -198,7 +198,7 @@ static int early_console_initialized; void early_printk(const char *fmt, ...) { - char buf[512]; + static char buf[512]; int n; va_list ap; Index: linux-2.6.26/arch/x86/kernel/head64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/head64.c +++ linux-2.6.26/arch/x86/kernel/head64.c @@ -29,7 +29,11 @@ static void __init zap_identity_mappings { pgd_t *pgd = pgd_offset_k(0UL); pgd_clear(pgd); - __flush_tlb_all(); + /* + * preempt_disable/enable does not work this early in the + * bootup yet: + */ + write_cr3(read_cr3()); } /* Don't add a printk in there. printk relies on the PDA which is not initialized Index: linux-2.6.26/arch/x86/kernel/i8259_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/i8259_64.c +++ linux-2.6.26/arch/x86/kernel/i8259_64.c @@ -97,8 +97,8 @@ static void (*__initdata interrupt[NR_VE */ static int i8259A_auto_eoi; -DEFINE_SPINLOCK(i8259A_lock); static void mask_and_ack_8259A(unsigned int); +DEFINE_RAW_SPINLOCK(i8259A_lock); static struct irq_chip i8259A_chip = { .name = "XT-PIC", Index: linux-2.6.26/arch/x86/kernel/io_apic_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/io_apic_64.c +++ linux-2.6.26/arch/x86/kernel/io_apic_64.c @@ -95,8 +95,8 @@ int timer_over_8254 __initdata = 1; /* Where if anywhere is the i8259 connect in external int mode */ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 }; -static DEFINE_SPINLOCK(ioapic_lock); -DEFINE_SPINLOCK(vector_lock); +static DEFINE_RAW_SPINLOCK(ioapic_lock); +DEFINE_RAW_SPINLOCK(vector_lock); /* * # of IRQ routing registers @@ -222,6 +222,9 @@ static inline void io_apic_sync(unsigned reg ACTION; \ io_apic_modify(entry->apic, reg); \ FINAL; \ + /* Force POST flush by reading: */ \ + reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \ + \ if (!entry->next) \ break; \ entry = irq_2_pin + entry->next; \ @@ -366,10 +369,8 @@ static void add_pin_to_irq(unsigned int static void name##_IO_APIC_irq (unsigned int irq) \ __DO_ACTION(R, ACTION, FINAL) -DO_ACTION( __mask, 0, |= 0x00010000, io_apic_sync(entry->apic) ) - /* mask = 1 */ -DO_ACTION( __unmask, 0, &= 0xfffeffff, ) - /* mask = 0 */ +DO_ACTION( __mask, 0, |= 0x00010000, ) /* mask = 1 */ +DO_ACTION( __unmask, 0, &= 0xfffeffff, ) /* mask = 0 */ DO_ACTION( __pcix_mask, 0, &= 0xffff7fff, ) /* edge */ DO_ACTION( __pcix_unmask, 0, = (reg & 0xfffeffff) | 0x00008000, ) /* level */ Index: linux-2.6.26/arch/x86/kernel/nmi_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/nmi_64.c +++ linux-2.6.26/arch/x86/kernel/nmi_64.c @@ -67,7 +67,9 @@ static int endflag __initdata = 0; */ static __init void nmi_cpu_busy(void *data) { +#ifndef CONFIG_PREEMPT_RT local_irq_enable_in_hardirq(); +#endif /* Intentionally don't use cpu_relax here. This is to make sure that the performance counter really ticks, even if there is a simulator or similar that catches the Index: linux-2.6.26/arch/x86/kernel/process_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/process_64.c +++ linux-2.6.26/arch/x86/kernel/process_64.c @@ -176,9 +176,11 @@ void cpu_idle(void) } tick_nohz_restart_sched_tick(); - preempt_enable_no_resched(); - schedule(); + local_irq_disable(); + __preempt_enable_no_resched(); + __schedule(); preempt_disable(); + local_irq_enable(); } } @@ -258,7 +260,7 @@ void exit_thread(void) struct thread_struct *t = &me->thread; if (me->thread.io_bitmap_ptr) { - struct tss_struct *tss = &per_cpu(init_tss, get_cpu()); + struct tss_struct *tss; kfree(t->io_bitmap_ptr); t->io_bitmap_ptr = NULL; @@ -266,6 +268,7 @@ void exit_thread(void) /* * Careful, clear this in the TSS too: */ + tss = &per_cpu(init_tss, get_cpu()); memset(tss->io_bitmap, 0xff, t->io_bitmap_max); t->io_bitmap_max = 0; put_cpu(); Index: linux-2.6.26/arch/x86/kernel/signal_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/signal_64.c +++ linux-2.6.26/arch/x86/kernel/signal_64.c @@ -417,6 +417,13 @@ static void do_signal(struct pt_regs *re int signr; sigset_t *oldset; +#ifdef CONFIG_PREEMPT_RT + /* + * Fully-preemptible kernel does not need interrupts disabled: + */ + local_irq_enable(); + preempt_check_resched(); +#endif /* * We want the common case to go fast, which is why we may in certain * cases get here from kernel mode. Just return without doing anything Index: linux-2.6.26/arch/x86/kernel/smp.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/smp.c +++ linux-2.6.26/arch/x86/kernel/smp.c @@ -122,10 +122,20 @@ static void native_smp_send_reschedule(i } /* + * this function sends a 'reschedule' IPI to all other CPUs. + * This is used when RT tasks are starving and other CPUs + * might be able to run them: + */ +void smp_send_reschedule_allbutself(void) +{ + send_IPI_allbutself(RESCHEDULE_VECTOR); +} + +/* * Structure and data for smp_call_function(). This is designed to minimise * static memory requirements. It also looks cleaner. */ -static DEFINE_SPINLOCK(call_lock); +static DEFINE_RAW_SPINLOCK(call_lock); struct call_data_struct { void (*func) (void *info); Index: linux-2.6.26/arch/x86/kernel/tlb_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/tlb_64.c +++ linux-2.6.26/arch/x86/kernel/tlb_64.c @@ -44,7 +44,7 @@ union smp_flush_state { cpumask_t flush_cpumask; struct mm_struct *flush_mm; unsigned long flush_va; - spinlock_t tlbstate_lock; + raw_spinlock_t tlbstate_lock; }; char pad[SMP_CACHE_BYTES]; } ____cacheline_aligned; Index: linux-2.6.26/arch/x86/kernel/traps_64.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/traps_64.c +++ linux-2.6.26/arch/x86/kernel/traps_64.c @@ -263,7 +263,7 @@ void dump_trace(struct task_struct *tsk, unsigned long *stack, unsigned long bp, const struct stacktrace_ops *ops, void *data) { - const unsigned cpu = get_cpu(); + const unsigned cpu = raw_smp_processor_id(); unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr; unsigned used = 0; struct thread_info *tinfo; @@ -347,7 +347,6 @@ void dump_trace(struct task_struct *tsk, * This handles the process stack: */ bp = print_context_stack(tinfo, stack, bp, ops, data, NULL); - put_cpu(); } EXPORT_SYMBOL(dump_trace); @@ -399,7 +398,7 @@ _show_stack(struct task_struct *tsk, str { unsigned long *stack; int i; - const int cpu = smp_processor_id(); + const int cpu = raw_smp_processor_id(); unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); Index: linux-2.6.26/include/asm-x86/acpi.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/acpi.h +++ linux-2.6.26/include/asm-x86/acpi.h @@ -49,8 +49,8 @@ #define ACPI_ASM_MACROS #define BREAKPOINT3 -#define ACPI_DISABLE_IRQS() local_irq_disable() -#define ACPI_ENABLE_IRQS() local_irq_enable() +#define ACPI_DISABLE_IRQS() local_irq_disable_nort() +#define ACPI_ENABLE_IRQS() local_irq_enable_nort() #define ACPI_FLUSH_CPU_CACHE() wbinvd() int __acpi_acquire_global_lock(unsigned int *lock); Index: linux-2.6.26/include/asm-x86/hw_irq_64.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/hw_irq_64.h +++ linux-2.6.26/include/asm-x86/hw_irq_64.h @@ -118,7 +118,7 @@ void i8254_timer_resume(void); typedef int vector_irq_t[NR_VECTORS]; DECLARE_PER_CPU(vector_irq_t, vector_irq); extern void __setup_vector_irq(int cpu); -extern spinlock_t vector_lock; +extern raw_spinlock_t vector_lock; /* * Various low-level irq details needed by irq.c, process.c, Index: linux-2.6.26/include/asm-x86/i8259.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/i8259.h +++ linux-2.6.26/include/asm-x86/i8259.h @@ -24,7 +24,7 @@ extern unsigned int cached_irq_mask; #define SLAVE_ICW4_DEFAULT 0x01 #define PIC_ICW4_AEOI 2 -extern spinlock_t i8259A_lock; +extern raw_spinlock_t i8259A_lock; extern void init_8259A(int auto_eoi); extern void enable_8259A_irq(unsigned int irq); Index: linux-2.6.26/include/asm-x86/spinlock.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/spinlock.h +++ linux-2.6.26/include/asm-x86/spinlock.h @@ -274,8 +274,8 @@ static inline void __raw_write_unlock(__ : "+m" (rw->lock) : "i" (RW_LOCK_BIAS) : "memory"); } -#define _raw_spin_relax(lock) cpu_relax() -#define _raw_read_relax(lock) cpu_relax() -#define _raw_write_relax(lock) cpu_relax() +#define __raw_spin_relax(lock) cpu_relax() +#define __raw_read_relax(lock) cpu_relax() +#define __raw_write_relax(lock) cpu_relax() #endif Index: linux-2.6.26/include/asm-x86/tlbflush.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/tlbflush.h +++ linux-2.6.26/include/asm-x86/tlbflush.h @@ -17,7 +17,9 @@ static inline void __native_flush_tlb(void) { + preempt_disable(); write_cr3(read_cr3()); + preempt_enable(); } static inline void __native_flush_tlb_global(void) Index: linux-2.6.26/include/asm-x86/vgtod.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/vgtod.h +++ linux-2.6.26/include/asm-x86/vgtod.h @@ -5,7 +5,7 @@ #include struct vsyscall_gtod_data { - seqlock_t lock; + raw_seqlock_t lock; /* open coded 'struct timespec' */ time_t wall_time_sec; patches/preempt-realtime-ia64.patch0000664000076400007640000011632411043564031016277 0ustar tglxtglx Hi, This is a first version of my port of Ingo's -rt kernel to the IA64 arch. So far the kernel boots with PREEMPT_RT enabled (on a 4-cpu tiger), and that's about it. I've not done extensive tests (only scripts/rt-tester), nor any measurements of any kind. There's very probably many bugs I'm not aware of. But there is already one thing I know should be fixed : I've changed the declaration of (struct zone).lock (in include/linux/mmzone.h) from spinlock_t to raw_spinlock_t. I did this because on IA64, cpu_idle(), which is not allowed to call schedule(), calls check_pgt_cache(). I guess this could be fixed by moving this call to another kernel thread... ideas are welcome. Simon. Signed-off-by: Simon.Derr@bull.net arch/ia64/Kconfig | 64 +++++++++++++++++++++++++ arch/ia64/kernel/asm-offsets.c | 2 arch/ia64/kernel/entry.S | 18 ++----- arch/ia64/kernel/fsys.S | 21 ++++++++ arch/ia64/kernel/iosapic.c | 33 ++++++++++++- arch/ia64/kernel/mca.c | 2 arch/ia64/kernel/perfmon.c | 6 +- arch/ia64/kernel/process.c | 10 ++-- arch/ia64/kernel/sal.c | 2 arch/ia64/kernel/salinfo.c | 6 +- arch/ia64/kernel/signal.c | 8 +++ arch/ia64/kernel/smp.c | 16 ++++++ arch/ia64/kernel/smpboot.c | 3 + arch/ia64/kernel/time.c | 74 +++++++++++++++++++---------- arch/ia64/kernel/traps.c | 10 ++-- arch/ia64/kernel/unwind.c | 4 - arch/ia64/kernel/unwind_i.h | 2 arch/ia64/mm/init.c | 2 arch/ia64/mm/tlb.c | 2 include/asm-ia64/irqflags.h | 95 ++++++++++++++++++++++++++++++++++++++ include/asm-ia64/mmu_context.h | 2 include/asm-ia64/processor.h | 6 +- include/asm-ia64/rtc.h | 7 ++ include/asm-ia64/rwsem.h | 32 ++++++------ include/asm-ia64/sal.h | 2 include/asm-ia64/spinlock.h | 26 ++++------ include/asm-ia64/spinlock_types.h | 4 - include/asm-ia64/system.h | 69 --------------------------- include/asm-ia64/tlb.h | 10 ++-- 29 files changed, 372 insertions(+), 166 deletions(-) Index: linux-2.6.26/arch/ia64/Kconfig =================================================================== --- linux-2.6.26.orig/arch/ia64/Kconfig +++ linux-2.6.26/arch/ia64/Kconfig @@ -58,6 +58,7 @@ config GENERIC_LOCKBREAK config RWSEM_XCHGADD_ALGORITHM bool + depends on !PREEMPT_RT default y config ARCH_HAS_ILOG2_U32 @@ -319,6 +320,69 @@ config SMP If you don't know what to do here, say N. + +config GENERIC_TIME + bool + default y + +config HIGH_RES_TIMERS + bool "High-Resolution Timers" + help + + POSIX timers are available by default. This option enables + high-resolution POSIX timers. With this option the resolution + is at least 1 microsecond. High resolution is not free. If + enabled this option will add a small overhead each time a + timer expires that is not on a 1/HZ tick boundary. If no such + timers are used the overhead is nil. + + This option enables two additional POSIX CLOCKS, + CLOCK_REALTIME_HR and CLOCK_MONOTONIC_HR. Note that this + option does not change the resolution of CLOCK_REALTIME or + CLOCK_MONOTONIC which remain at 1/HZ resolution. + +config HIGH_RES_RESOLUTION + int "High-Resolution-Timer resolution (nanoseconds)" + depends on HIGH_RES_TIMERS + default 1000 + help + + This sets the resolution of timers accessed with + CLOCK_REALTIME_HR and CLOCK_MONOTONIC_HR. Too + fine a resolution (small a number) will usually not + be observable due to normal system latencies. For an + 800 MHZ processor about 10,000 is the recommended maximum + (smallest number). If you don't need that sort of resolution, + higher numbers may generate less overhead. + +choice + prompt "Clock source" + depends on HIGH_RES_TIMERS + default HIGH_RES_TIMER_ITC + help + This option allows you to choose the hardware source in charge + of generating high precision interruptions on your system. + On IA-64 these are: + + + ITC Interval Time Counter 1/CPU clock + HPET High Precision Event Timer ~ (XXX:have to check the spec) + + The ITC timer is available on all the ia64 computers because + it is integrated directly into the processor. However it may not + give correct results on MP machines with processors running + at different clock rates. In this case you may want to use + the HPET if available on your machine. + + +config HIGH_RES_TIMER_ITC + bool "Interval Time Counter/ITC" + +config HIGH_RES_TIMER_HPET + bool "High Precision Event Timer/HPET" + +endchoice + config NR_CPUS int "Maximum number of CPUs (2-1024)" range 2 1024 Index: linux-2.6.26/arch/ia64/kernel/asm-offsets.c =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/asm-offsets.c +++ linux-2.6.26/arch/ia64/kernel/asm-offsets.c @@ -265,6 +265,7 @@ void foo(void) offsetof (struct pal_min_state_area_s, pmsa_xip)); BLANK(); +#ifdef CONFIG_TIME_INTERPOLATION /* used by fsys_gettimeofday in arch/ia64/kernel/fsys.S */ DEFINE(IA64_GTOD_LOCK_OFFSET, offsetof (struct fsyscall_gtod_data_t, lock)); @@ -286,4 +287,5 @@ void foo(void) offsetof (struct itc_jitter_data_t, itc_jitter)); DEFINE(IA64_ITC_LASTCYCLE_OFFSET, offsetof (struct itc_jitter_data_t, itc_lastcycle)); +#endif } Index: linux-2.6.26/arch/ia64/kernel/entry.S =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/entry.S +++ linux-2.6.26/arch/ia64/kernel/entry.S @@ -1169,21 +1169,17 @@ skip_rbs_switch: .work_pending: tbit.z p6,p0=r31,TIF_NEED_RESCHED // is resched not needed? (p6) br.cond.sptk.few .notify -#ifdef CONFIG_PREEMPT -(pKStk) dep r21=-1,r0,PREEMPT_ACTIVE_BIT,1 +(pKStk) br.cond.sptk.many .fromkernel ;; -(pKStk) st4 [r20]=r21 -#endif ssm psr.i // enable interrupts br.call.spnt.many rp=schedule -.ret9: cmp.eq p6,p0=r0,r0 // p6 <- 1 (re-check) - rsm psr.i // disable interrupts +.ret9a: rsm psr.i // disable interrupts ;; -#ifdef CONFIG_PREEMPT -(pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13 - ;; -(pKStk) st4 [r20]=r0 // preempt_count() <- 0 -#endif + br.cond.sptk.many .endpreemptdep +.fromkernel: + br.call.spnt.many rp=preempt_schedule_irq +.ret9b: rsm psr.i // disable interrupts +.endpreemptdep: (pLvSys)br.cond.sptk.few .work_pending_syscall_end br.cond.sptk.many .work_processed_kernel Index: linux-2.6.26/arch/ia64/kernel/fsys.S =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/fsys.S +++ linux-2.6.26/arch/ia64/kernel/fsys.S @@ -26,6 +26,7 @@ #include "entry.h" +#ifdef CONFIG_TIME_INTERPOLATION /* * See Documentation/ia64/fsys.txt for details on fsyscalls. * @@ -371,6 +372,26 @@ ENTRY(fsys_clock_gettime) br.many .gettime END(fsys_clock_gettime) + +#else // !CONFIG_TIME_INTERPOLATION + +# define fsys_gettimeofday 0 +# define fsys_clock_gettime 0 + +.fail_einval: + mov r8 = EINVAL + mov r10 = -1 + FSYS_RETURN + +.fail_efault: + mov r8 = EFAULT + mov r10 = -1 + FSYS_RETURN + +#endif + + + /* * long fsys_rt_sigprocmask (int how, sigset_t *set, sigset_t *oset, size_t sigsetsize). */ Index: linux-2.6.26/arch/ia64/kernel/iosapic.c =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/iosapic.c +++ linux-2.6.26/arch/ia64/kernel/iosapic.c @@ -111,7 +111,7 @@ (PAGE_SIZE / sizeof(struct iosapic_rte_info)) #define RTE_PREALLOCATED (1) -static DEFINE_SPINLOCK(iosapic_lock); +static DEFINE_RAW_SPINLOCK(iosapic_lock); /* * These tables map IA-64 vectors to the IOSAPIC pin that generates this @@ -390,6 +390,34 @@ iosapic_startup_level_irq (unsigned int return 0; } +/* + * In the preemptible case mask the IRQ first then handle it and ack it. + */ +#ifdef CONFIG_PREEMPT_HARDIRQS + +static void +iosapic_ack_level_irq (unsigned int irq) +{ + ia64_vector vec = irq_to_vector(irq); + struct iosapic_rte_info *rte; + + move_irq(irq); + mask_irq(irq); + list_for_each_entry(rte, &iosapic_intr_info[vec].rtes, rte_list) + iosapic_eoi(rte->addr, vec); +} + +static void +iosapic_end_level_irq (unsigned int irq) +{ + if (!(irq_desc[irq].status & IRQ_INPROGRESS)) + unmask_irq(irq); +} + +#else /* !CONFIG_PREEMPT_HARDIRQS */ + +#define iosapic_ack_level_irq nop + static void iosapic_end_level_irq (unsigned int irq) { @@ -412,10 +440,11 @@ iosapic_end_level_irq (unsigned int irq) } } +#endif + #define iosapic_shutdown_level_irq mask_irq #define iosapic_enable_level_irq unmask_irq #define iosapic_disable_level_irq mask_irq -#define iosapic_ack_level_irq nop static struct irq_chip irq_type_iosapic_level = { .name = "IO-SAPIC-level", Index: linux-2.6.26/arch/ia64/kernel/mca.c =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/mca.c +++ linux-2.6.26/arch/ia64/kernel/mca.c @@ -349,7 +349,7 @@ ia64_mca_spin(const char *func) typedef struct ia64_state_log_s { - spinlock_t isl_lock; + raw_spinlock_t isl_lock; int isl_index; unsigned long isl_count; ia64_err_rec_t *isl_log[IA64_MAX_LOGS]; /* need space to store header + error log */ Index: linux-2.6.26/arch/ia64/kernel/perfmon.c =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/perfmon.c +++ linux-2.6.26/arch/ia64/kernel/perfmon.c @@ -280,7 +280,7 @@ typedef struct { */ typedef struct pfm_context { - spinlock_t ctx_lock; /* context protection */ + raw_spinlock_t ctx_lock; /* context protection */ pfm_context_flags_t ctx_flags; /* bitmask of flags (block reason incl.) */ unsigned int ctx_state; /* state: active/inactive (no bitfield) */ @@ -369,7 +369,7 @@ typedef struct pfm_context { * mostly used to synchronize between system wide and per-process */ typedef struct { - spinlock_t pfs_lock; /* lock the structure */ + raw_spinlock_t pfs_lock; /* lock the structure */ unsigned int pfs_task_sessions; /* number of per task sessions */ unsigned int pfs_sys_sessions; /* number of per system wide sessions */ @@ -510,7 +510,7 @@ static pfm_intr_handler_desc_t *pfm_alt static struct proc_dir_entry *perfmon_dir; static pfm_uuid_t pfm_null_uuid = {0,}; -static spinlock_t pfm_buffer_fmt_lock; +static raw_spinlock_t pfm_buffer_fmt_lock; static LIST_HEAD(pfm_buffer_fmt_list); static pmu_config_t *pmu_conf; Index: linux-2.6.26/arch/ia64/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/process.c +++ linux-2.6.26/arch/ia64/kernel/process.c @@ -94,6 +94,9 @@ show_stack (struct task_struct *task, un void dump_stack (void) { + if (irqs_disabled()) { + printk("Uh oh.. entering dump_stack() with irqs disabled.\n"); + } show_stack(NULL, NULL); } @@ -328,10 +331,11 @@ cpu_idle (void) normal_xtp(); #endif } - preempt_enable_no_resched(); - schedule(); + __preempt_enable_no_resched(); + __schedule(); + preempt_disable(); - check_pgt_cache(); + if (cpu_is_offline(cpu)) play_dead(); } Index: linux-2.6.26/arch/ia64/kernel/sal.c =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/sal.c +++ linux-2.6.26/arch/ia64/kernel/sal.c @@ -18,7 +18,7 @@ #include #include - __cacheline_aligned DEFINE_SPINLOCK(sal_lock); + __cacheline_aligned DEFINE_RAW_SPINLOCK(sal_lock); unsigned long sal_platform_features; unsigned short sal_revision; Index: linux-2.6.26/arch/ia64/kernel/salinfo.c =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/salinfo.c +++ linux-2.6.26/arch/ia64/kernel/salinfo.c @@ -140,7 +140,7 @@ enum salinfo_state { struct salinfo_data { cpumask_t cpu_event; /* which cpus have outstanding events */ - struct semaphore mutex; + struct compat_semaphore mutex; u8 *log_buffer; u64 log_size; u8 *oemdata; /* decoded oem data */ @@ -156,8 +156,8 @@ struct salinfo_data { static struct salinfo_data salinfo_data[ARRAY_SIZE(salinfo_log_name)]; -static DEFINE_SPINLOCK(data_lock); -static DEFINE_SPINLOCK(data_saved_lock); +static DEFINE_RAW_SPINLOCK(data_lock); +static DEFINE_RAW_SPINLOCK(data_saved_lock); /** salinfo_platform_oemdata - optional callback to decode oemdata from an error * record. Index: linux-2.6.26/arch/ia64/kernel/signal.c =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/signal.c +++ linux-2.6.26/arch/ia64/kernel/signal.c @@ -456,6 +456,14 @@ ia64_do_signal (struct sigscratch *scr, long errno = scr->pt.r8; # define ERR_CODE(c) (IS_IA32_PROCESS(&scr->pt) ? -(c) : (c)) +#ifdef CONFIG_PREEMPT_RT + /* + * Fully-preemptible kernel does not need interrupts disabled: + */ + local_irq_enable(); + preempt_check_resched(); +#endif + /* * In the ia64_leave_kernel code path, we want the common case to go fast, which * is why we may in certain cases get here from kernel mode. Just return without Index: linux-2.6.26/arch/ia64/kernel/smp.c =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/smp.c +++ linux-2.6.26/arch/ia64/kernel/smp.c @@ -276,6 +276,22 @@ smp_send_reschedule (int cpu) } /* + * this function sends a 'reschedule' IPI to all other CPUs. + * This is used when RT tasks are starving and other CPUs + * might be able to run them: + */ +void smp_send_reschedule_allbutself(void) +{ + unsigned int cpu; + + for_each_online_cpu(cpu) { + if (cpu != smp_processor_id()) + platform_send_ipi(cpu, IA64_IPI_RESCHEDULE, + IA64_IPI_DM_INT, 0); + } +} + +/* * Called with preemption disabled. */ static void Index: linux-2.6.26/arch/ia64/kernel/smpboot.c =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/smpboot.c +++ linux-2.6.26/arch/ia64/kernel/smpboot.c @@ -371,6 +371,8 @@ smp_setup_percpu_timer (void) { } +extern void register_itc_clockevent(void); + static void __cpuinit smp_callin (void) { @@ -449,6 +451,7 @@ smp_callin (void) #ifdef CONFIG_IA32_SUPPORT ia32_gdt_init(); #endif + register_itc_clockevent(); /* * Allow the master to continue. Index: linux-2.6.26/arch/ia64/kernel/time.c =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/time.c +++ linux-2.6.26/arch/ia64/kernel/time.c @@ -149,6 +149,7 @@ timer_interrupt (int irq, void *dev_id) platform_timer_interrupt(irq, dev_id); +#if 0 new_itm = local_cpu_data->itm_next; if (!time_after(ia64_get_itc(), new_itm)) @@ -156,29 +157,48 @@ timer_interrupt (int irq, void *dev_id) ia64_get_itc(), new_itm); profile_tick(CPU_PROFILING); +#endif + + if (time_after(ia64_get_itc(), local_cpu_data->itm_tick_next)) { - while (1) { - update_process_times(user_mode(get_irq_regs())); + unsigned long new_tick_itm; + new_tick_itm = local_cpu_data->itm_tick_next; - new_itm += local_cpu_data->itm_delta; + profile_tick(CPU_PROFILING, get_irq_regs()); - if (smp_processor_id() == time_keeper_id) { - /* - * Here we are in the timer irq handler. We have irqs locally - * disabled, but we don't know if the timer_bh is running on - * another CPU. We need to avoid to SMP race by acquiring the - * xtime_lock. - */ - write_seqlock(&xtime_lock); - do_timer(1); - local_cpu_data->itm_next = new_itm; - write_sequnlock(&xtime_lock); - } else - local_cpu_data->itm_next = new_itm; + while (1) { + update_process_times(user_mode(get_irq_regs())); + + new_tick_itm += local_cpu_data->itm_tick_delta; + + if (smp_processor_id() == time_keeper_id) { + /* + * Here we are in the timer irq handler. We have irqs locally + * disabled, but we don't know if the timer_bh is running on + * another CPU. We need to avoid to SMP race by acquiring the + * xtime_lock. + */ + write_seqlock(&xtime_lock); + do_timer(get_irq_regs()); + local_cpu_data->itm_tick_next = new_tick_itm; + write_sequnlock(&xtime_lock); + } else + local_cpu_data->itm_tick_next = new_tick_itm; + + if (time_after(new_tick_itm, ia64_get_itc())) + break; + } + } - if (time_after(new_itm, ia64_get_itc())) - break; + if (time_after(ia64_get_itc(), local_cpu_data->itm_timer_next)) { + if (itc_clockevent.event_handler) + itc_clockevent.event_handler(get_irq_regs()); + // FIXME, really, please + new_itm = local_cpu_data->itm_tick_next; + + if (time_after(new_itm, local_cpu_data->itm_timer_next)) + new_itm = local_cpu_data->itm_timer_next; /* * Allow IPIs to interrupt the timer loop. */ @@ -196,8 +216,8 @@ timer_interrupt (int irq, void *dev_id) * too fast (with the potentially devastating effect * of losing monotony of time). */ - while (!time_after(new_itm, ia64_get_itc() + local_cpu_data->itm_delta/2)) - new_itm += local_cpu_data->itm_delta; + while (!time_after(new_itm, ia64_get_itc() + local_cpu_data->itm_tick_delta/2)) + new_itm += local_cpu_data->itm_tick_delta; ia64_set_itm(new_itm); /* double check, in case we got hit by a (slow) PMI: */ } while (time_after_eq(ia64_get_itc(), new_itm)); @@ -216,7 +236,7 @@ ia64_cpu_local_tick (void) /* arrange for the cycle counter to generate a timer interrupt: */ ia64_set_itv(IA64_TIMER_VECTOR); - delta = local_cpu_data->itm_delta; + delta = local_cpu_data->itm_tick_delta; /* * Stagger the timer tick for each CPU so they don't occur all at (almost) the * same time: @@ -225,8 +245,8 @@ ia64_cpu_local_tick (void) unsigned long hi = 1UL << ia64_fls(cpu); shift = (2*(cpu - hi) + 1) * delta/hi/2; } - local_cpu_data->itm_next = ia64_get_itc() + delta + shift; - ia64_set_itm(local_cpu_data->itm_next); + local_cpu_data->itm_tick_next = ia64_get_itc() + delta + shift; + ia64_set_itm(local_cpu_data->itm_tick_next); } static int nojitter; @@ -284,7 +304,7 @@ ia64_init_itm (void) itc_freq = (platform_base_freq*itc_ratio.num)/itc_ratio.den; - local_cpu_data->itm_delta = (itc_freq + HZ/2) / HZ; + local_cpu_data->itm_tick_delta = (itc_freq + HZ/2) / HZ; printk(KERN_DEBUG "CPU %d: base freq=%lu.%03luMHz, ITC ratio=%u/%u, " "ITC freq=%lu.%03luMHz", smp_processor_id(), platform_base_freq / 1000000, (platform_base_freq / 1000) % 1000, @@ -304,6 +324,7 @@ ia64_init_itm (void) local_cpu_data->nsec_per_cyc = ((NSEC_PER_SEC<mfh = 1; } - preempt_enable_no_resched(); + __preempt_enable_no_resched(); } static inline int Index: linux-2.6.26/arch/ia64/kernel/unwind.c =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/unwind.c +++ linux-2.6.26/arch/ia64/kernel/unwind.c @@ -82,7 +82,7 @@ typedef unsigned long unw_word; typedef unsigned char unw_hash_index_t; static struct { - spinlock_t lock; /* spinlock for unwind data */ + raw_spinlock_t lock; /* spinlock for unwind data */ /* list of unwind tables (one per load-module) */ struct unw_table *tables; @@ -146,7 +146,7 @@ static struct { # endif } unw = { .tables = &unw.kernel_table, - .lock = __SPIN_LOCK_UNLOCKED(unw.lock), + .lock = RAW_SPIN_LOCK_UNLOCKED(unw.lock), .save_order = { UNW_REG_RP, UNW_REG_PFS, UNW_REG_PSP, UNW_REG_PR, UNW_REG_UNAT, UNW_REG_LC, UNW_REG_FPSR, UNW_REG_PRI_UNAT_GR Index: linux-2.6.26/arch/ia64/kernel/unwind_i.h =================================================================== --- linux-2.6.26.orig/arch/ia64/kernel/unwind_i.h +++ linux-2.6.26/arch/ia64/kernel/unwind_i.h @@ -154,7 +154,7 @@ struct unw_script { unsigned long ip; /* ip this script is for */ unsigned long pr_mask; /* mask of predicates script depends on */ unsigned long pr_val; /* predicate values this script is for */ - rwlock_t lock; + raw_rwlock_t lock; unsigned int flags; /* see UNW_FLAG_* in unwind.h */ unsigned short lru_chain; /* used for least-recently-used chain */ unsigned short coll_chain; /* used for hash collisions */ Index: linux-2.6.26/arch/ia64/mm/init.c =================================================================== --- linux-2.6.26.orig/arch/ia64/mm/init.c +++ linux-2.6.26/arch/ia64/mm/init.c @@ -37,7 +37,7 @@ #include #include -DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); +DEFINE_PER_CPU_LOCKED(struct mmu_gather, mmu_gathers); extern void ia64_tlb_init (void); Index: linux-2.6.26/arch/ia64/mm/tlb.c =================================================================== --- linux-2.6.26.orig/arch/ia64/mm/tlb.c +++ linux-2.6.26/arch/ia64/mm/tlb.c @@ -39,7 +39,7 @@ static struct { } purge; struct ia64_ctx ia64_ctx = { - .lock = __SPIN_LOCK_UNLOCKED(ia64_ctx.lock), + .lock = RAW_SPIN_LOCK_UNLOCKED(ia64_ctx.lock), .next = 1, .max_ctx = ~0U }; Index: linux-2.6.26/include/asm-ia64/irqflags.h =================================================================== --- /dev/null +++ linux-2.6.26/include/asm-ia64/irqflags.h @@ -0,0 +1,95 @@ + +/* + * include/asm-i64/irqflags.h + * + * IRQ flags handling + * + * This file gets included from lowlevel asm headers too, to provide + * wrapped versions of the local_irq_*() APIs, based on the + * raw_local_irq_*() macros from the lowlevel headers. + */ +#ifndef _ASM_IRQFLAGS_H +#define _ASM_IRQFLAGS_H + +/* For spinlocks etc */ + +/* + * - clearing psr.i is implicitly serialized (visible by next insn) + * - setting psr.i requires data serialization + * - we need a stop-bit before reading PSR because we sometimes + * write a floating-point register right before reading the PSR + * and that writes to PSR.mfl + */ +#define __local_irq_save(x) \ +do { \ + ia64_stop(); \ + (x) = ia64_getreg(_IA64_REG_PSR); \ + ia64_stop(); \ + ia64_rsm(IA64_PSR_I); \ +} while (0) + +#define __local_irq_disable() \ +do { \ + ia64_stop(); \ + ia64_rsm(IA64_PSR_I); \ +} while (0) + +#define __local_irq_restore(x) ia64_intrin_local_irq_restore((x) & IA64_PSR_I) + +#ifdef CONFIG_IA64_DEBUG_IRQ + + extern unsigned long last_cli_ip; + +# define __save_ip() last_cli_ip = ia64_getreg(_IA64_REG_IP) + +# define raw_local_irq_save(x) \ +do { \ + unsigned long psr; \ + \ + __local_irq_save(psr); \ + if (psr & IA64_PSR_I) \ + __save_ip(); \ + (x) = psr; \ +} while (0) + +# define raw_local_irq_disable() do { unsigned long x; local_irq_save(x); } while (0) + +# define raw_local_irq_restore(x) \ +do { \ + unsigned long old_psr, psr = (x); \ + \ + local_save_flags(old_psr); \ + __local_irq_restore(psr); \ + if ((old_psr & IA64_PSR_I) && !(psr & IA64_PSR_I)) \ + __save_ip(); \ +} while (0) + +#else /* !CONFIG_IA64_DEBUG_IRQ */ +# define raw_local_irq_save(x) __local_irq_save(x) +# define raw_local_irq_disable() __local_irq_disable() +# define raw_local_irq_restore(x) __local_irq_restore(x) +#endif /* !CONFIG_IA64_DEBUG_IRQ */ + +#define raw_local_irq_enable() ({ ia64_stop(); ia64_ssm(IA64_PSR_I); ia64_srlz_d(); }) +#define raw_local_save_flags(flags) ({ ia64_stop(); (flags) = ia64_getreg(_IA64_REG_PSR); }) + +#define raw_irqs_disabled() \ +({ \ + unsigned long __ia64_id_flags; \ + local_save_flags(__ia64_id_flags); \ + (__ia64_id_flags & IA64_PSR_I) == 0; \ +}) + +#define raw_irqs_disabled_flags(flags) ((flags & IA64_PSR_I) == 0) + + +#define raw_safe_halt() ia64_pal_halt_light() /* PAL_HALT_LIGHT */ + +/* TBD... */ +# define TRACE_IRQS_ON +# define TRACE_IRQS_OFF +# define TRACE_IRQS_ON_STR +# define TRACE_IRQS_OFF_STR + +#endif + Index: linux-2.6.26/include/asm-ia64/mmu_context.h =================================================================== --- linux-2.6.26.orig/include/asm-ia64/mmu_context.h +++ linux-2.6.26/include/asm-ia64/mmu_context.h @@ -32,7 +32,7 @@ #include struct ia64_ctx { - spinlock_t lock; + raw_spinlock_t lock; unsigned int next; /* next context number to use */ unsigned int limit; /* available free range */ unsigned int max_ctx; /* max. context value supported by all CPUs */ Index: linux-2.6.26/include/asm-ia64/processor.h =================================================================== --- linux-2.6.26.orig/include/asm-ia64/processor.h +++ linux-2.6.26/include/asm-ia64/processor.h @@ -188,8 +188,10 @@ union ia64_rr { */ struct cpuinfo_ia64 { __u32 softirq_pending; - __u64 itm_delta; /* # of clock cycles between clock ticks */ - __u64 itm_next; /* interval timer mask value to use for next clock tick */ + __u64 itm_tick_delta; /* # of clock cycles between clock ticks */ + __u64 itm_tick_next; /* interval timer mask value to use for next clock tick */ + __u64 itm_timer_next; + __u64 __itm_next; __u64 nsec_per_cyc; /* (1000000000<count = RWSEM_UNLOCKED_VALUE; spin_lock_init(&sem->wait_lock); @@ -70,7 +70,7 @@ init_rwsem (struct rw_semaphore *sem) * lock for reading */ static inline void -__down_read (struct rw_semaphore *sem) +__down_read (struct compat_rw_semaphore *sem) { long result = ia64_fetchadd8_acq((unsigned long *)&sem->count, 1); @@ -82,7 +82,7 @@ __down_read (struct rw_semaphore *sem) * lock for writing */ static inline void -__down_write (struct rw_semaphore *sem) +__down_write (struct compat_rw_semaphore *sem) { long old, new; @@ -99,7 +99,7 @@ __down_write (struct rw_semaphore *sem) * unlock after reading */ static inline void -__up_read (struct rw_semaphore *sem) +__up_read (struct compat_rw_semaphore *sem) { long result = ia64_fetchadd8_rel((unsigned long *)&sem->count, -1); @@ -111,7 +111,7 @@ __up_read (struct rw_semaphore *sem) * unlock after writing */ static inline void -__up_write (struct rw_semaphore *sem) +__up_write (struct compat_rw_semaphore *sem) { long old, new; @@ -128,7 +128,7 @@ __up_write (struct rw_semaphore *sem) * trylock for reading -- returns 1 if successful, 0 if contention */ static inline int -__down_read_trylock (struct rw_semaphore *sem) +__down_read_trylock (struct compat_rw_semaphore *sem) { long tmp; while ((tmp = sem->count) >= 0) { @@ -143,7 +143,7 @@ __down_read_trylock (struct rw_semaphore * trylock for writing -- returns 1 if successful, 0 if contention */ static inline int -__down_write_trylock (struct rw_semaphore *sem) +__down_write_trylock (struct compat_rw_semaphore *sem) { long tmp = cmpxchg_acq(&sem->count, RWSEM_UNLOCKED_VALUE, RWSEM_ACTIVE_WRITE_BIAS); @@ -154,7 +154,7 @@ __down_write_trylock (struct rw_semaphor * downgrade write lock to read lock */ static inline void -__downgrade_write (struct rw_semaphore *sem) +__downgrade_write (struct compat_rw_semaphore *sem) { long old, new; @@ -174,7 +174,7 @@ __downgrade_write (struct rw_semaphore * #define rwsem_atomic_add(delta, sem) atomic64_add(delta, (atomic64_t *)(&(sem)->count)) #define rwsem_atomic_update(delta, sem) atomic64_add_return(delta, (atomic64_t *)(&(sem)->count)) -static inline int rwsem_is_locked(struct rw_semaphore *sem) +static inline int compat_rwsem_is_locked(struct compat_rw_semaphore *sem) { return (sem->count != 0); } Index: linux-2.6.26/include/asm-ia64/sal.h =================================================================== --- linux-2.6.26.orig/include/asm-ia64/sal.h +++ linux-2.6.26/include/asm-ia64/sal.h @@ -43,7 +43,7 @@ #include #include -extern spinlock_t sal_lock; +extern raw_spinlock_t sal_lock; /* SAL spec _requires_ eight args for each call. */ #define __IA64_FW_CALL(entry,result,a0,a1,a2,a3,a4,a5,a6,a7) \ Index: linux-2.6.26/include/asm-ia64/spinlock.h =================================================================== --- linux-2.6.26.orig/include/asm-ia64/spinlock.h +++ linux-2.6.26/include/asm-ia64/spinlock.h @@ -17,8 +17,6 @@ #include #include -#define __raw_spin_lock_init(x) ((x)->lock = 0) - #ifdef ASM_SUPPORTED /* * Try to get the lock. If we fail to get the lock, make a non-standard call to @@ -30,7 +28,7 @@ #define IA64_SPINLOCK_CLOBBERS "ar.ccv", "ar.pfs", "p14", "p15", "r27", "r28", "r29", "r30", "b6", "memory" static inline void -__raw_spin_lock_flags (raw_spinlock_t *lock, unsigned long flags) +__raw_spin_lock_flags (__raw_spinlock_t *lock, unsigned long flags) { register volatile unsigned int *ptr asm ("r31") = &lock->lock; @@ -89,7 +87,7 @@ __raw_spin_lock_flags (raw_spinlock_t *l #define __raw_spin_lock(lock) __raw_spin_lock_flags(lock, 0) /* Unlock by doing an ordered store and releasing the cacheline with nta */ -static inline void __raw_spin_unlock(raw_spinlock_t *x) { +static inline void __raw_spin_unlock(__raw_spinlock_t *x) { barrier(); asm volatile ("st4.rel.nta [%0] = r0\n\t" :: "r"(x)); } @@ -109,7 +107,7 @@ do { \ } while (ia64_spinlock_val); \ } \ } while (0) -#define __raw_spin_unlock(x) do { barrier(); ((raw_spinlock_t *) x)->lock = 0; } while (0) +#define __raw_spin_unlock(x) do { barrier(); ((__raw_spinlock_t *) x)->lock = 0; } while (0) #endif /* !ASM_SUPPORTED */ #define __raw_spin_is_locked(x) ((x)->lock != 0) @@ -122,7 +120,7 @@ do { \ #define __raw_read_lock(rw) \ do { \ - raw_rwlock_t *__read_lock_ptr = (rw); \ + __raw_rwlock_t *__read_lock_ptr = (rw); \ \ while (unlikely(ia64_fetchadd(1, (int *) __read_lock_ptr, acq) < 0)) { \ ia64_fetchadd(-1, (int *) __read_lock_ptr, rel); \ @@ -133,7 +131,7 @@ do { \ #define __raw_read_unlock(rw) \ do { \ - raw_rwlock_t *__read_lock_ptr = (rw); \ + __raw_rwlock_t *__read_lock_ptr = (rw); \ ia64_fetchadd(-1, (int *) __read_lock_ptr, rel); \ } while (0) @@ -165,7 +163,7 @@ do { \ (result == 0); \ }) -static inline void __raw_write_unlock(raw_rwlock_t *x) +static inline void __raw_write_unlock(__raw_rwlock_t *x) { u8 *y = (u8 *)x; barrier(); @@ -193,7 +191,7 @@ static inline void __raw_write_unlock(ra (ia64_val == 0); \ }) -static inline void __raw_write_unlock(raw_rwlock_t *x) +static inline void __raw_write_unlock(__raw_rwlock_t *x) { barrier(); x->write_lock = 0; @@ -201,10 +199,10 @@ static inline void __raw_write_unlock(ra #endif /* !ASM_SUPPORTED */ -static inline int __raw_read_trylock(raw_rwlock_t *x) +static inline int __raw_read_trylock(__raw_rwlock_t *x) { union { - raw_rwlock_t lock; + __raw_rwlock_t lock; __u32 word; } old, new; old.lock = new.lock = *x; @@ -213,8 +211,8 @@ static inline int __raw_read_trylock(raw return (u32)ia64_cmpxchg4_acq((__u32 *)(x), new.word, old.word) == old.word; } -#define _raw_spin_relax(lock) cpu_relax() -#define _raw_read_relax(lock) cpu_relax() -#define _raw_write_relax(lock) cpu_relax() +#define __raw_spin_relax(lock) cpu_relax() +#define __raw_read_relax(lock) cpu_relax() +#define __raw_write_relax(lock) cpu_relax() #endif /* _ASM_IA64_SPINLOCK_H */ Index: linux-2.6.26/include/asm-ia64/spinlock_types.h =================================================================== --- linux-2.6.26.orig/include/asm-ia64/spinlock_types.h +++ linux-2.6.26/include/asm-ia64/spinlock_types.h @@ -7,14 +7,14 @@ typedef struct { volatile unsigned int lock; -} raw_spinlock_t; +} __raw_spinlock_t; #define __RAW_SPIN_LOCK_UNLOCKED { 0 } typedef struct { volatile unsigned int read_counter : 31; volatile unsigned int write_lock : 1; -} raw_rwlock_t; +} __raw_rwlock_t; #define __RAW_RW_LOCK_UNLOCKED { 0, 0 } Index: linux-2.6.26/include/asm-ia64/system.h =================================================================== --- linux-2.6.26.orig/include/asm-ia64/system.h +++ linux-2.6.26/include/asm-ia64/system.h @@ -106,81 +106,14 @@ extern struct ia64_boot_param { */ #define set_mb(var, value) do { (var) = (value); mb(); } while (0) -#define safe_halt() ia64_pal_halt_light() /* PAL_HALT_LIGHT */ /* * The group barrier in front of the rsm & ssm are necessary to ensure * that none of the previous instructions in the same group are * affected by the rsm/ssm. */ -/* For spinlocks etc */ -/* - * - clearing psr.i is implicitly serialized (visible by next insn) - * - setting psr.i requires data serialization - * - we need a stop-bit before reading PSR because we sometimes - * write a floating-point register right before reading the PSR - * and that writes to PSR.mfl - */ -#define __local_irq_save(x) \ -do { \ - ia64_stop(); \ - (x) = ia64_getreg(_IA64_REG_PSR); \ - ia64_stop(); \ - ia64_rsm(IA64_PSR_I); \ -} while (0) - -#define __local_irq_disable() \ -do { \ - ia64_stop(); \ - ia64_rsm(IA64_PSR_I); \ -} while (0) - -#define __local_irq_restore(x) ia64_intrin_local_irq_restore((x) & IA64_PSR_I) - -#ifdef CONFIG_IA64_DEBUG_IRQ - - extern unsigned long last_cli_ip; - -# define __save_ip() last_cli_ip = ia64_getreg(_IA64_REG_IP) - -# define local_irq_save(x) \ -do { \ - unsigned long __psr; \ - \ - __local_irq_save(__psr); \ - if (__psr & IA64_PSR_I) \ - __save_ip(); \ - (x) = __psr; \ -} while (0) - -# define local_irq_disable() do { unsigned long __x; local_irq_save(__x); } while (0) - -# define local_irq_restore(x) \ -do { \ - unsigned long __old_psr, __psr = (x); \ - \ - local_save_flags(__old_psr); \ - __local_irq_restore(__psr); \ - if ((__old_psr & IA64_PSR_I) && !(__psr & IA64_PSR_I)) \ - __save_ip(); \ -} while (0) - -#else /* !CONFIG_IA64_DEBUG_IRQ */ -# define local_irq_save(x) __local_irq_save(x) -# define local_irq_disable() __local_irq_disable() -# define local_irq_restore(x) __local_irq_restore(x) -#endif /* !CONFIG_IA64_DEBUG_IRQ */ - -#define local_irq_enable() ({ ia64_stop(); ia64_ssm(IA64_PSR_I); ia64_srlz_d(); }) -#define local_save_flags(flags) ({ ia64_stop(); (flags) = ia64_getreg(_IA64_REG_PSR); }) - -#define irqs_disabled() \ -({ \ - unsigned long __ia64_id_flags; \ - local_save_flags(__ia64_id_flags); \ - (__ia64_id_flags & IA64_PSR_I) == 0; \ -}) +#include #ifdef __KERNEL__ Index: linux-2.6.26/include/asm-ia64/tlb.h =================================================================== --- linux-2.6.26.orig/include/asm-ia64/tlb.h +++ linux-2.6.26/include/asm-ia64/tlb.h @@ -40,6 +40,7 @@ #include #include #include +#include #include #include @@ -61,6 +62,7 @@ struct mmu_gather { unsigned char need_flush; /* really unmapped some PTEs? */ unsigned long start_addr; unsigned long end_addr; + int cpu; struct page *pages[FREE_PTE_NR]; }; @@ -91,7 +93,7 @@ extern struct ia64_tr_entry __per_cpu_id #define RR_TO_RID(val) ((val >> 8) & 0xffffff) /* Users of the generic TLB shootdown code must declare this storage space. */ -DECLARE_PER_CPU(struct mmu_gather, mmu_gathers); +DECLARE_PER_CPU_LOCKED(struct mmu_gather, mmu_gathers); /* * Flush the TLB for address range START to END and, if not in fast mode, release the @@ -153,8 +155,10 @@ ia64_tlb_flush_mmu (struct mmu_gather *t static inline struct mmu_gather * tlb_gather_mmu (struct mm_struct *mm, unsigned int full_mm_flush) { - struct mmu_gather *tlb = &get_cpu_var(mmu_gathers); + int cpu; + struct mmu_gather *tlb = &get_cpu_var_locked(mmu_gathers, &cpu); + tlb->cpu = cpu; tlb->mm = mm; /* * Use fast mode if only 1 CPU is online. @@ -191,7 +195,7 @@ tlb_finish_mmu (struct mmu_gather *tlb, /* keep the page table cache within bounds */ check_pgt_cache(); - put_cpu_var(mmu_gathers); + put_cpu_var_locked(mmu_gathers, tlb->cpu); } /* patches/preempt-realtime-powerpc.patch0000664000076400007640000004000711043564031017205 0ustar tglxtglx--- arch/powerpc/kernel/smp.c | 12 ++++++++- arch/powerpc/kernel/traps.c | 9 +++++-- arch/powerpc/platforms/cell/smp.c | 2 - arch/powerpc/platforms/chrp/smp.c | 2 - arch/powerpc/platforms/chrp/time.c | 2 - arch/powerpc/platforms/powermac/feature.c | 2 - arch/powerpc/platforms/powermac/nvram.c | 2 - arch/powerpc/platforms/powermac/pic.c | 2 - arch/powerpc/platforms/pseries/smp.c | 2 - arch/ppc/8260_io/enet.c | 2 - arch/ppc/8260_io/fcc_enet.c | 2 - arch/ppc/8xx_io/commproc.c | 2 - arch/ppc/8xx_io/enet.c | 2 - arch/ppc/8xx_io/fec.c | 2 - arch/ppc/kernel/smp.c | 12 ++++++++- arch/ppc/kernel/traps.c | 6 +++- arch/ppc/platforms/hdpu.c | 2 - arch/ppc/platforms/sbc82xx.c | 2 - arch/ppc/syslib/cpm2_common.c | 2 - arch/ppc/syslib/open_pic.c | 2 - arch/ppc/syslib/open_pic2.c | 2 - include/asm-powerpc/hw_irq.h | 38 +++++++++++++++++------------- 22 files changed, 73 insertions(+), 38 deletions(-) Index: linux-2.6.26/arch/powerpc/kernel/smp.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/smp.c +++ linux-2.6.26/arch/powerpc/kernel/smp.c @@ -128,6 +128,16 @@ void smp_send_reschedule(int cpu) smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE); } +/* + * this function sends a 'reschedule' IPI to all other CPUs. + * This is used when RT tasks are starving and other CPUs + * might be able to run them: + */ +void smp_send_reschedule_allbutself(void) +{ + smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_RESCHEDULE); +} + #ifdef CONFIG_DEBUGGER void smp_send_debugger_break(int cpu) { @@ -159,7 +169,7 @@ static void stop_this_cpu(void *dummy) * static memory requirements. It also looks cleaner. * Stolen from the i386 version. */ -static __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock); +static __cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(call_lock); static struct call_data_struct { void (*func) (void *info); Index: linux-2.6.26/arch/powerpc/kernel/traps.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/traps.c +++ linux-2.6.26/arch/powerpc/kernel/traps.c @@ -98,11 +98,11 @@ static inline void pmac_backlight_unblan int die(const char *str, struct pt_regs *regs, long err) { static struct { - spinlock_t lock; + raw_spinlock_t lock; u32 lock_owner; int lock_owner_depth; } die = { - .lock = __SPIN_LOCK_UNLOCKED(die.lock), + .lock = _RAW_SPIN_LOCK_UNLOCKED(die.lock), .lock_owner = -1, .lock_owner_depth = 0 }; @@ -191,6 +191,11 @@ void _exception(int signr, struct pt_reg addr, regs->nip, regs->link, code); } +#ifdef CONFIG_PREEMPT_RT + local_irq_enable(); + preempt_check_resched(); +#endif + memset(&info, 0, sizeof(info)); info.si_signo = signr; info.si_code = code; Index: linux-2.6.26/arch/powerpc/platforms/cell/smp.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/cell/smp.c +++ linux-2.6.26/arch/powerpc/platforms/cell/smp.c @@ -135,7 +135,7 @@ static void __devinit smp_iic_setup_cpu( iic_setup_cpu(); } -static DEFINE_SPINLOCK(timebase_lock); +static DEFINE_RAW_SPINLOCK(timebase_lock); static unsigned long timebase = 0; static void __devinit cell_give_timebase(void) Index: linux-2.6.26/arch/powerpc/platforms/chrp/smp.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/chrp/smp.c +++ linux-2.6.26/arch/powerpc/platforms/chrp/smp.c @@ -42,7 +42,7 @@ static void __devinit smp_chrp_setup_cpu mpic_setup_this_cpu(); } -static DEFINE_SPINLOCK(timebase_lock); +static DEFINE_RAW_SPINLOCK(timebase_lock); static unsigned int timebase_upper = 0, timebase_lower = 0; void __devinit smp_chrp_give_timebase(void) Index: linux-2.6.26/arch/powerpc/platforms/chrp/time.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/chrp/time.c +++ linux-2.6.26/arch/powerpc/platforms/chrp/time.c @@ -27,7 +27,7 @@ #include #include -extern spinlock_t rtc_lock; +extern raw_spinlock_t rtc_lock; static int nvram_as1 = NVRAM_AS1; static int nvram_as0 = NVRAM_AS0; Index: linux-2.6.26/arch/powerpc/platforms/powermac/feature.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/powermac/feature.c +++ linux-2.6.26/arch/powerpc/platforms/powermac/feature.c @@ -59,7 +59,7 @@ extern struct device_node *k2_skiplist[2 * We use a single global lock to protect accesses. Each driver has * to take care of its own locking */ -DEFINE_SPINLOCK(feature_lock); +DEFINE_RAW_SPINLOCK(feature_lock); #define LOCK(flags) spin_lock_irqsave(&feature_lock, flags); #define UNLOCK(flags) spin_unlock_irqrestore(&feature_lock, flags); Index: linux-2.6.26/arch/powerpc/platforms/powermac/nvram.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/powermac/nvram.c +++ linux-2.6.26/arch/powerpc/platforms/powermac/nvram.c @@ -80,7 +80,7 @@ static int is_core_99; static int core99_bank = 0; static int nvram_partitions[3]; // XXX Turn that into a sem -static DEFINE_SPINLOCK(nv_lock); +static DEFINE_RAW_SPINLOCK(nv_lock); static int (*core99_write_bank)(int bank, u8* datas); static int (*core99_erase_bank)(int bank); Index: linux-2.6.26/arch/powerpc/platforms/powermac/pic.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/powermac/pic.c +++ linux-2.6.26/arch/powerpc/platforms/powermac/pic.c @@ -63,7 +63,7 @@ static int max_irqs; static int max_real_irqs; static u32 level_mask[4]; -static DEFINE_SPINLOCK(pmac_pic_lock); +static DEFINE_RAW_SPINLOCK(pmac_pic_lock); #define NR_MASK_WORDS ((NR_IRQS + 31) / 32) static unsigned long ppc_lost_interrupts[NR_MASK_WORDS]; Index: linux-2.6.26/arch/powerpc/platforms/pseries/smp.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/pseries/smp.c +++ linux-2.6.26/arch/powerpc/platforms/pseries/smp.c @@ -148,7 +148,7 @@ static void __devinit smp_xics_setup_cpu } #endif /* CONFIG_XICS */ -static DEFINE_SPINLOCK(timebase_lock); +static DEFINE_RAW_SPINLOCK(timebase_lock); static unsigned long timebase = 0; static void __devinit pSeries_give_timebase(void) Index: linux-2.6.26/arch/ppc/8260_io/enet.c =================================================================== --- linux-2.6.26.orig/arch/ppc/8260_io/enet.c +++ linux-2.6.26/arch/ppc/8260_io/enet.c @@ -115,7 +115,7 @@ struct scc_enet_private { scc_t *sccp; struct net_device_stats stats; uint tx_full; - spinlock_t lock; + raw_spinlock_t lock; }; static int scc_enet_open(struct net_device *dev); Index: linux-2.6.26/arch/ppc/8260_io/fcc_enet.c =================================================================== --- linux-2.6.26.orig/arch/ppc/8260_io/fcc_enet.c +++ linux-2.6.26/arch/ppc/8260_io/fcc_enet.c @@ -364,7 +364,7 @@ struct fcc_enet_private { volatile fcc_enet_t *ep; struct net_device_stats stats; uint tx_free; - spinlock_t lock; + raw_spinlock_t lock; #ifdef CONFIG_USE_MDIO uint phy_id; Index: linux-2.6.26/arch/ppc/8xx_io/commproc.c =================================================================== --- linux-2.6.26.orig/arch/ppc/8xx_io/commproc.c +++ linux-2.6.26/arch/ppc/8xx_io/commproc.c @@ -332,7 +332,7 @@ cpm_setbrg(uint brg, uint rate) /* * dpalloc / dpfree bits. */ -static spinlock_t cpm_dpmem_lock; +static raw_spinlock_t cpm_dpmem_lock; /* * 16 blocks should be enough to satisfy all requests * until the memory subsystem goes up... Index: linux-2.6.26/arch/ppc/8xx_io/enet.c =================================================================== --- linux-2.6.26.orig/arch/ppc/8xx_io/enet.c +++ linux-2.6.26/arch/ppc/8xx_io/enet.c @@ -143,7 +143,7 @@ struct scc_enet_private { unsigned char *rx_vaddr[RX_RING_SIZE]; struct net_device_stats stats; uint tx_full; - spinlock_t lock; + raw_spinlock_t lock; }; static int scc_enet_open(struct net_device *dev); Index: linux-2.6.26/arch/ppc/8xx_io/fec.c =================================================================== --- linux-2.6.26.orig/arch/ppc/8xx_io/fec.c +++ linux-2.6.26/arch/ppc/8xx_io/fec.c @@ -164,7 +164,7 @@ struct fec_enet_private { struct net_device_stats stats; uint tx_full; - spinlock_t lock; + raw_spinlock_t lock; #ifdef CONFIG_USE_MDIO uint phy_id; Index: linux-2.6.26/arch/ppc/kernel/smp.c =================================================================== --- linux-2.6.26.orig/arch/ppc/kernel/smp.c +++ linux-2.6.26/arch/ppc/kernel/smp.c @@ -136,6 +136,16 @@ void smp_send_reschedule(int cpu) smp_message_pass(cpu, PPC_MSG_RESCHEDULE); } +/* + * this function sends a 'reschedule' IPI to all other CPUs. + * This is used when RT tasks are starving and other CPUs + * might be able to run them: + */ +void smp_send_reschedule_allbutself(void) +{ + smp_message_pass(MSG_ALL_BUT_SELF, PPC_MSG_RESCHEDULE, 0, 0); +} + #ifdef CONFIG_XMON void smp_send_xmon_break(int cpu) { @@ -160,7 +170,7 @@ void smp_send_stop(void) * static memory requirements. It also looks cleaner. * Stolen from the i386 version. */ -static DEFINE_SPINLOCK(call_lock); +static DEFINE_RAW_SPINLOCK(call_lock); static struct call_data_struct { void (*func) (void *info); Index: linux-2.6.26/arch/ppc/kernel/traps.c =================================================================== --- linux-2.6.26.orig/arch/ppc/kernel/traps.c +++ linux-2.6.26/arch/ppc/kernel/traps.c @@ -72,7 +72,7 @@ void (*debugger_fault_handler)(struct pt * Trap & Exception support */ -DEFINE_SPINLOCK(die_lock); +DEFINE_RAW_SPINLOCK(die_lock); int die(const char * str, struct pt_regs * fp, long err) { @@ -108,6 +108,10 @@ void _exception(int signr, struct pt_reg debugger(regs); die("Exception in kernel mode", regs, signr); } +#ifdef CONFIG_PREEMPT_RT + local_irq_enable(); + preempt_check_resched(); +#endif info.si_signo = signr; info.si_errno = 0; info.si_code = code; Index: linux-2.6.26/arch/ppc/platforms/hdpu.c =================================================================== --- linux-2.6.26.orig/arch/ppc/platforms/hdpu.c +++ linux-2.6.26/arch/ppc/platforms/hdpu.c @@ -54,7 +54,7 @@ static void parse_bootinfo(unsigned long static void hdpu_set_l1pe(void); static void hdpu_cpustate_set(unsigned char new_state); #ifdef CONFIG_SMP -static DEFINE_SPINLOCK(timebase_lock); +static DEFINE_RAW_SPINLOCK(timebase_lock); static unsigned int timebase_upper = 0, timebase_lower = 0; extern int smp_tb_synchronized; Index: linux-2.6.26/arch/ppc/platforms/sbc82xx.c =================================================================== --- linux-2.6.26.orig/arch/ppc/platforms/sbc82xx.c +++ linux-2.6.26/arch/ppc/platforms/sbc82xx.c @@ -63,7 +63,7 @@ static void sbc82xx_time_init(void) static volatile char *sbc82xx_i8259_map; static char sbc82xx_i8259_mask = 0xff; -static DEFINE_SPINLOCK(sbc82xx_i8259_lock); +static DEFINE_RAW_SPINLOCK(sbc82xx_i8259_lock); static void sbc82xx_i8259_mask_and_ack_irq(unsigned int irq_nr) { Index: linux-2.6.26/arch/ppc/syslib/cpm2_common.c =================================================================== --- linux-2.6.26.orig/arch/ppc/syslib/cpm2_common.c +++ linux-2.6.26/arch/ppc/syslib/cpm2_common.c @@ -114,7 +114,7 @@ cpm2_fastbrg(uint brg, uint rate, int di /* * dpalloc / dpfree bits. */ -static spinlock_t cpm_dpmem_lock; +static raw_spinlock_t cpm_dpmem_lock; /* 16 blocks should be enough to satisfy all requests * until the memory subsystem goes up... */ static rh_block_t cpm_boot_dpmem_rh_block[16]; Index: linux-2.6.26/arch/ppc/syslib/open_pic.c =================================================================== --- linux-2.6.26.orig/arch/ppc/syslib/open_pic.c +++ linux-2.6.26/arch/ppc/syslib/open_pic.c @@ -526,7 +526,7 @@ void openpic_reset_processor_phys(u_int } #if defined(CONFIG_SMP) || defined(CONFIG_PM) -static DEFINE_SPINLOCK(openpic_setup_lock); +static DEFINE_RAW_SPINLOCK(openpic_setup_lock); #endif #ifdef CONFIG_SMP Index: linux-2.6.26/arch/ppc/syslib/open_pic2.c =================================================================== --- linux-2.6.26.orig/arch/ppc/syslib/open_pic2.c +++ linux-2.6.26/arch/ppc/syslib/open_pic2.c @@ -380,7 +380,7 @@ static void openpic2_set_spurious(u_int vec); } -static DEFINE_SPINLOCK(openpic2_setup_lock); +static DEFINE_RAW_SPINLOCK(openpic2_setup_lock); /* * Initialize a timer interrupt (and disable it) Index: linux-2.6.26/include/asm-powerpc/hw_irq.h =================================================================== --- linux-2.6.26.orig/include/asm-powerpc/hw_irq.h +++ linux-2.6.26/include/asm-powerpc/hw_irq.h @@ -16,7 +16,7 @@ extern void timer_interrupt(struct pt_re #ifdef CONFIG_PPC64 #include -static inline unsigned long local_get_flags(void) +static inline unsigned long raw_local_get_flags(void) { unsigned long flags; @@ -39,18 +39,21 @@ static inline unsigned long raw_local_ir return flags; } -extern void raw_local_irq_restore(unsigned long); extern void iseries_handle_interrupts(void); +extern unsigned long raw_local_get_flags(void); +extern unsigned long raw_local_irq_disable(void); +extern void raw_local_irq_restore(unsigned long); #define raw_local_irq_enable() raw_local_irq_restore(1) -#define raw_local_save_flags(flags) ((flags) = local_get_flags()) +#define raw_local_save_flags(flags) ((flags) = raw_local_get_flags()) #define raw_local_irq_save(flags) ((flags) = raw_local_irq_disable()) -#define raw_irqs_disabled() (local_get_flags() == 0) +#define raw_irqs_disabled() (raw_local_get_flags() == 0) #define raw_irqs_disabled_flags(flags) ((flags) == 0) -#define __hard_irq_enable() __mtmsrd(mfmsr() | MSR_EE, 1) -#define __hard_irq_disable() __mtmsrd(mfmsr() & ~MSR_EE, 1) + +#define __hard_irq_enable() __mtmsrd(mfmsr() | MSR_EE, 1) +#define __hard_irq_disable() __mtmsrd(mfmsr() & ~MSR_EE, 1) #define hard_irq_disable() \ do { \ @@ -59,17 +62,17 @@ extern void iseries_handle_interrupts(vo get_paca()->hard_enabled = 0; \ } while(0) -#else +#else /* CONFIG_PPC64 */ #if defined(CONFIG_BOOKE) #define SET_MSR_EE(x) mtmsr(x) -#define local_irq_restore(flags) __asm__ __volatile__("wrtee %0" : : "r" (flags) : "memory") +#define raw_local_irq_restore(flags) __asm__ __volatile__("wrtee %0" : : "r" (flags) : "memory") #else #define SET_MSR_EE(x) mtmsr(x) -#define local_irq_restore(flags) mtmsr(flags) -#endif +#define raw_local_irq_restore(flags) mtmsr(flags) +#endif /* CONFIG_BOOKE */ -static inline void local_irq_disable(void) +static inline void raw_local_irq_disable(void) { #ifdef CONFIG_BOOKE __asm__ __volatile__("wrteei 0": : :"memory"); @@ -81,7 +84,7 @@ static inline void local_irq_disable(voi #endif } -static inline void local_irq_enable(void) +static inline void raw_local_irq_enable(void) { #ifdef CONFIG_BOOKE __asm__ __volatile__("wrteei 1": : :"memory"); @@ -93,7 +96,7 @@ static inline void local_irq_enable(void #endif } -static inline void local_irq_save_ptr(unsigned long *flags) +static inline void raw_local_irq_save_ptr(unsigned long *flags) { unsigned long msr; msr = mfmsr(); @@ -106,13 +109,16 @@ static inline void local_irq_save_ptr(un __asm__ __volatile__("": : :"memory"); } -#define local_save_flags(flags) ((flags) = mfmsr()) -#define local_irq_save(flags) local_irq_save_ptr(&flags) -#define irqs_disabled() ((mfmsr() & MSR_EE) == 0) +#define raw_local_save_flags(flags) ((flags) = mfmsr()) +#define raw_local_irq_save(flags) raw_local_irq_save_ptr(&flags) +#define raw_irqs_disabled() ((mfmsr() & MSR_EE) == 0) +#define raw_irqs_disabled_flags(flags) ((flags & MSR_EE) == 0) #define hard_irq_enable() local_irq_enable() #define hard_irq_disable() local_irq_disable() +#include + #endif /* CONFIG_PPC64 */ /* patches/preempt-realtime-powerpc-update.patch0000664000076400007640000000414711043564030020471 0ustar tglxtglx--- arch/powerpc/Kconfig.debug | 4 ++++ arch/powerpc/kernel/idle.c | 2 +- include/asm-powerpc/hw_irq.h | 2 +- include/asm-powerpc/pmac_feature.h | 2 +- 4 files changed, 7 insertions(+), 3 deletions(-) Index: linux-2.6.26/arch/powerpc/Kconfig.debug =================================================================== --- linux-2.6.26.orig/arch/powerpc/Kconfig.debug +++ linux-2.6.26/arch/powerpc/Kconfig.debug @@ -2,6 +2,10 @@ menu "Kernel hacking" source "lib/Kconfig.debug" +config TRACE_IRQFLAGS_SUPPORT + bool + default y + config DEBUG_STACKOVERFLOW bool "Check for stack overflows" depends on DEBUG_KERNEL Index: linux-2.6.26/arch/powerpc/kernel/idle.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/idle.c +++ linux-2.6.26/arch/powerpc/kernel/idle.c @@ -95,7 +95,7 @@ void cpu_idle(void) tick_nohz_restart_sched_tick(); if (cpu_should_die()) cpu_die(); - preempt_enable_no_resched(); + __preempt_enable_no_resched(); schedule(); preempt_disable(); } Index: linux-2.6.26/include/asm-powerpc/hw_irq.h =================================================================== --- linux-2.6.26.orig/include/asm-powerpc/hw_irq.h +++ linux-2.6.26/include/asm-powerpc/hw_irq.h @@ -117,7 +117,7 @@ static inline void raw_local_irq_save_pt #define hard_irq_enable() local_irq_enable() #define hard_irq_disable() local_irq_disable() -#include +#include #endif /* CONFIG_PPC64 */ Index: linux-2.6.26/include/asm-powerpc/pmac_feature.h =================================================================== --- linux-2.6.26.orig/include/asm-powerpc/pmac_feature.h +++ linux-2.6.26/include/asm-powerpc/pmac_feature.h @@ -378,7 +378,7 @@ extern struct macio_chip* macio_find(str * Those are exported by pmac feature for internal use by arch code * only like the platform function callbacks, do not use directly in drivers */ -extern spinlock_t feature_lock; +extern raw_spinlock_t feature_lock; extern struct device_node *uninorth_node; extern u32 __iomem *uninorth_base; patches/preempt-realtime-powerpc-b2.patch0000664000076400007640000000477711043564030017523 0ustar tglxtglx To convert the spinlocks into the raw onces to fix the following warnings/errors. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Badness at arch/powerpc/kernel/entry_64.S:651 Call Trace: [C0000000006133E0] [C00000000000FAAC] show_stack+0x68/0x1b0 (unreliable) [C000000000613480] [C0000000001EF004] .repor000001EF004] .report_bug+0x94/0xe8 [C000000000613510] [C0000000003EAD58] .program_check_exception+0x170/0x5a8 [C00000000000487C] program_check_common+0xfc/0x100 --- arch/powerpc/kernel/irq.c | 2 +- arch/powerpc/kernel/rtas.c | 2 +- arch/powerpc/mm/hash_native_64.c | 2 +- include/asm-powerpc/rtas.h | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-) Index: linux-2.6.26/arch/powerpc/kernel/irq.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/irq.c +++ linux-2.6.26/arch/powerpc/kernel/irq.c @@ -423,7 +423,7 @@ void do_softirq(void) #ifdef CONFIG_PPC_MERGE static LIST_HEAD(irq_hosts); -static DEFINE_SPINLOCK(irq_big_lock); +static DEFINE_RAW_SPINLOCK(irq_big_lock); static DEFINE_PER_CPU(unsigned int, irq_radix_reader); static unsigned int irq_radix_writer; struct irq_map_entry irq_map[NR_IRQS]; Index: linux-2.6.26/arch/powerpc/kernel/rtas.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/rtas.c +++ linux-2.6.26/arch/powerpc/kernel/rtas.c @@ -40,7 +40,7 @@ #include struct rtas_t rtas = { - .lock = SPIN_LOCK_UNLOCKED + .lock = RAW_SPIN_LOCK_UNLOCKED(lock) }; EXPORT_SYMBOL(rtas); Index: linux-2.6.26/arch/powerpc/mm/hash_native_64.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/mm/hash_native_64.c +++ linux-2.6.26/arch/powerpc/mm/hash_native_64.c @@ -36,7 +36,7 @@ #define HPTE_LOCK_BIT 3 -static DEFINE_SPINLOCK(native_tlbie_lock); +static DEFINE_RAW_SPINLOCK(native_tlbie_lock); static inline void __tlbie(unsigned long va, int psize, int ssize) { Index: linux-2.6.26/include/asm-powerpc/rtas.h =================================================================== --- linux-2.6.26.orig/include/asm-powerpc/rtas.h +++ linux-2.6.26/include/asm-powerpc/rtas.h @@ -58,7 +58,7 @@ struct rtas_t { unsigned long entry; /* physical address pointer */ unsigned long base; /* physical address pointer */ unsigned long size; - spinlock_t lock; + raw_spinlock_t lock; struct rtas_args args; struct device_node *dev; /* virtual address pointer */ }; patches/preempt-realtime-powerpc-b3.patch0000664000076400007640000000375011043564030017512 0ustar tglxtglx To fix the following runtime warning. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - BUG: using smp_processor_id() in preemptible [00000000] code: init/371 caller is .pgtable_free_tlb+0x2c/0x14c Call Trace: [C00000000FF6B770] [C00000000000FAAC] .show_stack+0x68/0x1b0 (unreliable) [C00000000FF6B810] [C0000000001F7190] .debug_smp_processor_id+0xc8/0xf8 [C00000000FF6B8A0] [C00000000002C52C] .pgtable_free_tlb+0x2c/0x14c [C00000000FF6B940] [C0000000000B6528] .free_pgd_range+0x234/0x3bc [C00000000FF6BA40] [C0000000000B6AB8] .free_pgtables+0x224/0x260 [C00000000FF6BB00] [C0000000000B7FE8] .exit_mmap+0x100/0x208 [C00000000FF6BBC0] [C000000000055FB0] .mmput+0x70/0x12c [C00000000FF6BC50] [C00000000005B728] .exit_mm+0x150/0x170 [C00000000FF6BCE0] [C00000000005D80C] .do_exit+0x28c/0x9bc [C00000000FF6BDA0] [C00000000005DFF0] .sys_exit_group+0x0/0x8 [C00000000FF6BE30] [C000000000008634] syscall_exit+0x0/0x40 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Would it be better to just use raw_smp_processor_id() rather than tlb->cpu? Signed-off-by: Tsutomu Owa -- owa --- arch/powerpc/mm/tlb_64.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) Index: linux-2.6.26/arch/powerpc/mm/tlb_64.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/mm/tlb_64.c +++ linux-2.6.26/arch/powerpc/mm/tlb_64.c @@ -91,8 +91,11 @@ static void pte_free_submit(struct pte_f void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf) { - /* This is safe since tlb_gather_mmu has disabled preemption */ - cpumask_t local_cpumask = cpumask_of_cpu(smp_processor_id()); + /* + * This is safe since tlb_gather_mmu has disabled preemption. + * tlb->cpu is set by tlb_gather_mmu as well. + */ + cpumask_t local_cpumask = cpumask_of_cpu(tlb->cpu); struct pte_freelist_batch **batchp = &__get_cpu_var(pte_freelist_cur); if (atomic_read(&tlb->mm->mm_users) < 2 || patches/preempt-realtime-powerpc-b4.patch0000664000076400007640000000725011043564030017512 0ustar tglxtglx At Wed, 07 Mar 2007 11:10:59 +0100, Benjamin Herrenschmidt wrote: > > On Wed, 2007-03-07 at 10:16 +0100, Ingo Molnar wrote: > > * Tsutomu OWA wrote: > > > > > @@ -342,6 +342,7 @@ static int xmon_core(struct pt_regs *reg > > > > > > msr = mfmsr(); > > > mtmsr(msr & ~MSR_EE); /* disable interrupts */ > > > + preempt_disable(); > > > > i'm not an xmon expert, but maybe it might make more sense to first > > disable preemption, then interrupts - otherwise you could be preempted > > right after having disabled these interrupts (and be scheduled to > > another CPU, etc.). What is the difference between local_irq_save() and > > the above 'disable interrupts' sequence? If it's not the same and > > xmon_core() relied on having hardirqs disabled then it might make sense > > to do a local_irq_save() there, instead of a preempt_disable(). > > powerpc 64 bits nowadays does lazy HW masking, so local_irq_disable() > will not actually switch MSR_EE off. However, xmon needs that to happen > (though we have a nicer accessor to do it, I suspect some bitrot need > fixing in there, possibly already fixed in .21) > > I agree that preempt_disable() should be put before the MSR tweaking > though. As all of you said, I'm resending the patch here. To fix the following runtime warnings when entering xmon. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Entering xmon BUG: using smp_processor_id() in preemptible [00000000] code: khvcd/280 caller is .xmon_core+0xb8/0x8ec Call Trace: [C00000000FD737C0] [C00000000000FAAC] .show_stack+0x68/0x1b0 (unreliable) [C00000000FD73860] [C0000000001F71F0] .debug_smp_processor_id+0xc8/0xf8 [C00000000FD738F0] [C00000000004AF30] .xmon_core+0xb8/0x8ec [C00000000FD73A80] [C00000000004B918] .xmon+0x38/0x4c [C00000000FD73C60] [C00000000004BA8C] .sysrq_handle_xmon+0x48/0x5c [C00000000FD73CD0] [C000000000243A68] .__handle_sysrq+0xe0/0x1b0 [C00000000FD73D70] [C000000000244974] .hvc_poll+0x18c/0x2b4 [C00000000FD73E50] [C000000000244E80] .khvcd+0x88/0x164 [C00000000FD73EE0] [C000000000075014] .kthread+0x124/0x174 [C00000000FD73F90] [C000000000023D48] .kernel_thread+0x4c/0x68 BUG: khvcd:280 task might have lost a preemption check! Call Trace: [C00000000FD73740] [C00000000000FAAC] .show_stack+0x68/0x1b0 (unreliable) [C00000000FD737E0] [C000000000054920] .preempt_enable_no_resched+0x64/0x7c [C00000000FD73860] [C0000000001F71F8] .debug_smp_processor_id+0xd0/0xf8 [C00000000FD738F0] [C00000000004AF30] .xmon_core+0xb8/0x8ec [C00000000FD73A80] [C00000000004B918] .xmon+0x38/0x4c [C00000000FD73C60] [C00000000004BA8C] .sysrq_handle_xmon+0x48/0x5c [C00000000FD73CD0] [C000000000243A68] .__handle_sysrq+0xe0/0x1b0 [C00000000FD73D70] [C000000000244974] .hvc_poll+0x18c/0x2b4 [C00000000FD73E50] [C000000000244E80] .khvcd+0x88/0x164 [C00000000FD73EE0] [C000000000075014] .kthread+0x124/0x174 [C00000000FD73F90] [C000000000023D48] .kernel_thread+0x4c/0x68 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - thanks a lot! Signed-off-by: Tsutomu Owa -- owa --- arch/powerpc/xmon/xmon.c | 2 ++ 1 file changed, 2 insertions(+) Index: linux-2.6.26/arch/powerpc/xmon/xmon.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/xmon/xmon.c +++ linux-2.6.26/arch/powerpc/xmon/xmon.c @@ -342,6 +342,7 @@ static int xmon_core(struct pt_regs *reg unsigned long timeout; #endif + preempt_disable(); local_irq_save(flags); bp = in_breakpoint_table(regs->nip, &offset); @@ -518,6 +519,7 @@ static int xmon_core(struct pt_regs *reg insert_cpu_bpts(); local_irq_restore(flags); + preempt_enable(); return cmd != 'X' && cmd != EOF; } patches/preempt-realtime-powerpc-add-raw-relax-macros.patch0000664000076400007640000000214011043564027023116 0ustar tglxtglxFrom tsutomu.owa@toshiba.co.jp Mon May 14 15:26:25 2007 Date: Mon, 14 May 2007 15:26:25 +0900 From: Tsutomu OWA To: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org Cc: mingo@elte.hu, tglx@linutronix.de Subject: Re: [patch 1/4] powerpc 2.6.21-rt1: fix a build breakage by adding __raw_*_relax() macros Add missing macros to fix a build breakage for PREEMPT_DESKTOP. Signed-off-by: Tsutomu OWA -- owa --- include/asm-powerpc/spinlock.h | 4 ++++ 1 file changed, 4 insertions(+) Index: linux-2.6.26/include/asm-powerpc/spinlock.h =================================================================== --- linux-2.6.26.orig/include/asm-powerpc/spinlock.h +++ linux-2.6.26/include/asm-powerpc/spinlock.h @@ -290,5 +290,9 @@ static __inline__ void __raw_write_unloc #define _raw_read_relax(lock) __rw_yield(lock) #define _raw_write_relax(lock) __rw_yield(lock) +#define __raw_spin_relax(lock) cpu_relax() +#define __raw_read_relax(lock) cpu_relax() +#define __raw_write_relax(lock) cpu_relax() + #endif /* __KERNEL__ */ #endif /* __ASM_SPINLOCK_H */ patches/preempt-realtime-powerpc-tlb-batching.patch0000664000076400007640000000375311043564027021555 0ustar tglxtglxFrom tsutomu.owa@toshiba.co.jp Tue May 15 15:27:26 2007 Date: Tue, 15 May 2007 15:27:26 +0900 From: Tsutomu OWA To: Arnd Bergmann Cc: linuxppc-dev@ozlabs.org, Thomas Gleixner , mingo@elte.hu, linux-kernel@vger.kernel.org Subject: Re: [patch 4/4] powerpc 2.6.21-rt1: reduce scheduling latency by changing tlb flush size At Mon, 14 May 2007 16:40:02 +0200, Arnd Bergmann wrote: > > +#if defined(CONFIG_PPC_CELLEB) && defined(CONFIG_PREEMPT_RT) > > +/* Since tlb flush takes long time on Celleb, reduce it to 1 when Celleb && RT */ > > +#define PPC64_TLB_BATCH_NR 1 > With this code, you get silent side-effects of enabling PPC_CELLEB > along with another platform. > Maybe instead you should change the hpte_need_flush() to always flush > when running on the celleb platform and PREEMPT_RT is enabled. OK, how about this one? thanks a lot! Since flushing tlb needs expensive hypervisor call(s) on celleb, always flush it on RT to reduce scheduling latency. Signed-off-by: Tsutomu OWA -- owa --- arch/powerpc/mm/tlb_64.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) Index: linux-2.6.26/arch/powerpc/mm/tlb_64.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/mm/tlb_64.c +++ linux-2.6.26/arch/powerpc/mm/tlb_64.c @@ -30,6 +30,7 @@ #include #include #include +#include DEFINE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch); @@ -207,6 +208,18 @@ void hpte_need_flush(struct mm_struct *m batch->pte[i] = rpte; batch->vaddr[i] = vaddr; batch->index = ++i; + +#ifdef CONFIG_PREEMPT_RT + /* + * Since flushing tlb needs expensive hypervisor call(s) on celleb, + * always flush it on RT to reduce scheduling latency. + */ + if (machine_is(celleb)) { + flush_tlb_pending(); + return; + } +#endif /* CONFIG_PREEMPT_RT */ + if (i >= PPC64_TLB_BATCH_NR) __flush_tlb_pending(batch); } patches/preempt-realtime-powerpc-celleb-raw-spinlocks.patch0000664000076400007640000000313311043564027023227 0ustar tglxtglxFrom tsutomu.owa@toshiba.co.jp Mon May 14 15:28:23 2007 Date: Mon, 14 May 2007 15:28:23 +0900 From: Tsutomu OWA To: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org Cc: mingo@elte.hu, tglx@linutronix.de Subject: Re: [patch 2/4] powerpc 2.6.21-rt1: convert spinlocks to raw ones for Celleb. Convert more spinlocks to raw ones for Celleb. Signed-off-by: Tsutomu OWA -- owa --- arch/powerpc/platforms/cell/beat_htab.c | 2 +- arch/powerpc/platforms/cell/beat_interrupt.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6.26/arch/powerpc/platforms/cell/beat_htab.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/cell/beat_htab.c +++ linux-2.6.26/arch/powerpc/platforms/cell/beat_htab.c @@ -40,7 +40,7 @@ #define DBG_LOW(fmt...) do { } while (0) #endif -static DEFINE_SPINLOCK(beat_htab_lock); +static DEFINE_RAW_SPINLOCK(beat_htab_lock); static inline unsigned int beat_read_mask(unsigned hpte_group) { Index: linux-2.6.26/arch/powerpc/platforms/cell/beat_interrupt.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/platforms/cell/beat_interrupt.c +++ linux-2.6.26/arch/powerpc/platforms/cell/beat_interrupt.c @@ -30,7 +30,7 @@ #include "beat_wrapper.h" #define MAX_IRQS NR_IRQS -static DEFINE_SPINLOCK(beatic_irq_mask_lock); +static DEFINE_RAW_SPINLOCK(beatic_irq_mask_lock); static uint64_t beatic_irq_mask_enable[(MAX_IRQS+255)/64]; static uint64_t beatic_irq_mask_ack[(MAX_IRQS+255)/64]; patches/preempt-realtime-powerpc-missing-raw-spinlocks.patch0000664000076400007640000000754511043564027023465 0ustar tglxtglxFrom sshtylyov@ru.mvista.com Thu Jun 21 22:24:22 2007 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.1.7-deb (2006-10-05) on debian X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=AWL autolearn=unavailable version=3.1.7-deb Received: from imap.sh.mvista.com (unknown [63.81.120.155]) by mail.tglx.de (Postfix) with ESMTP id 2149065C065 for ; Thu, 21 Jun 2007 22:24:22 +0200 (CEST) Received: from wasted.dev.rtsoft.ru (unknown [10.150.0.9]) by imap.sh.mvista.com (Postfix) with ESMTP id D27113EC9; Thu, 21 Jun 2007 13:24:15 -0700 (PDT) From: Sergei Shtylyov Organization: MontaVista Software Inc. To: tglx@linutronix.de, bruce.ashfield@gmail.com, rostedt@goodmis.org Subject: [PATCH] (2.6.20-rt3) PowerPC: convert spinlocks into raw Date: Thu, 21 Jun 2007 23:25:58 +0300 User-Agent: KMail/1.5 MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="iso-8859-1" Message-Id: <200706220025.58799.sshtylyov@ru.mvista.com> X-Evolution-Source: imap://tglx%40linutronix.de@localhost:8993/ Content-Transfer-Encoding: 8bit Convert the spinlocks in the PowerPC interrupt related code into the raw ones, also convert the PURR and PMC related spinlocks... Signed-off-by: Mark A. Greer Signed-off-by: Sergei Shtylyov --- Resending in hopes it still can apply -- if it doesn't, bug me again... :-) --- arch/powerpc/kernel/pmc.c | 2 +- arch/powerpc/sysdev/i8259.c | 2 +- arch/powerpc/sysdev/ipic.c | 2 +- arch/powerpc/sysdev/mpic.c | 2 +- include/asm-powerpc/mpic.h | 2 +- 5 files changed, 5 insertions(+), 5 deletions(-) Index: linux-2.6.26/arch/powerpc/kernel/pmc.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/kernel/pmc.c +++ linux-2.6.26/arch/powerpc/kernel/pmc.c @@ -37,7 +37,7 @@ static void dummy_perf(struct pt_regs *r } -static DEFINE_SPINLOCK(pmc_owner_lock); +static DEFINE_RAW_SPINLOCK(pmc_owner_lock); static void *pmc_owner_caller; /* mostly for debugging */ perf_irq_t perf_irq = dummy_perf; Index: linux-2.6.26/arch/powerpc/sysdev/i8259.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/sysdev/i8259.c +++ linux-2.6.26/arch/powerpc/sysdev/i8259.c @@ -23,7 +23,7 @@ static unsigned char cached_8259[2] = { #define cached_A1 (cached_8259[0]) #define cached_21 (cached_8259[1]) -static DEFINE_SPINLOCK(i8259_lock); +static DEFINE_RAW_SPINLOCK(i8259_lock); static struct irq_host *i8259_host; Index: linux-2.6.26/arch/powerpc/sysdev/ipic.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/sysdev/ipic.c +++ linux-2.6.26/arch/powerpc/sysdev/ipic.c @@ -31,7 +31,7 @@ static struct ipic * primary_ipic; static struct irq_chip ipic_level_irq_chip, ipic_edge_irq_chip; -static DEFINE_SPINLOCK(ipic_lock); +static DEFINE_RAW_SPINLOCK(ipic_lock); static struct ipic_info ipic_info[] = { [1] = { Index: linux-2.6.26/arch/powerpc/sysdev/mpic.c =================================================================== --- linux-2.6.26.orig/arch/powerpc/sysdev/mpic.c +++ linux-2.6.26/arch/powerpc/sysdev/mpic.c @@ -46,7 +46,7 @@ static struct mpic *mpics; static struct mpic *mpic_primary; -static DEFINE_SPINLOCK(mpic_lock); +static DEFINE_RAW_SPINLOCK(mpic_lock); #ifdef CONFIG_PPC32 /* XXX for now */ #ifdef CONFIG_IRQ_ALL_CPUS Index: linux-2.6.26/include/asm-powerpc/mpic.h =================================================================== --- linux-2.6.26.orig/include/asm-powerpc/mpic.h +++ linux-2.6.26/include/asm-powerpc/mpic.h @@ -280,7 +280,7 @@ struct mpic #ifdef CONFIG_MPIC_U3_HT_IRQS /* The fixup table */ struct mpic_irq_fixup *fixups; - spinlock_t fixup_lock; + raw_spinlock_t fixup_lock; #endif /* Register access method */ patches/preempt-realtime-i386.patch0000664000076400007640000005326711043564027016240 0ustar tglxtglx--- arch/Kconfig | 5 ++++ arch/x86/Kconfig.debug | 1 arch/x86/kernel/cpu/mtrr/generic.c | 2 - arch/x86/kernel/head_32.S | 1 arch/x86/kernel/i8253.c | 2 - arch/x86/kernel/i8259_32.c | 2 - arch/x86/kernel/io_apic_32.c | 4 +-- arch/x86/kernel/irq_32.c | 4 ++- arch/x86/kernel/microcode.c | 2 - arch/x86/kernel/nmi_32.c | 5 ++++ arch/x86/kernel/process_32.c | 20 ++++++++++++---- arch/x86/kernel/signal_32.c | 14 +++++++++++ arch/x86/kernel/traps_32.c | 18 ++++++++++++-- arch/x86/kernel/vm86_32.c | 1 arch/x86/mm/fault.c | 1 arch/x86/mm/highmem_32.c | 36 +++++++++++++++++++++++------ arch/x86/pci/common.c | 2 - arch/x86/pci/direct.c | 29 +++++++++++++++-------- arch/x86/pci/pci.h | 2 - include/asm-x86/highmem.h | 27 +++++++++++++++++++++ include/asm-x86/i8253.h | 2 - include/asm-x86/mach-default/irq_vectors.h | 2 - include/asm-x86/tlbflush.h | 22 +++++++++++++++++ include/asm-x86/xor_32.h | 19 +++++++++++++-- 24 files changed, 185 insertions(+), 38 deletions(-) Index: linux-2.6.26/arch/Kconfig =================================================================== --- linux-2.6.26.orig/arch/Kconfig +++ linux-2.6.26/arch/Kconfig @@ -16,6 +16,11 @@ config OPROFILE config HAVE_OPROFILE def_bool n +config PROFILE_NMI + bool + depends on OPROFILE + default y + config KPROBES bool "Kprobes" depends on KALLSYMS && MODULES Index: linux-2.6.26/arch/x86/Kconfig.debug =================================================================== --- linux-2.6.26.orig/arch/x86/Kconfig.debug +++ linux-2.6.26/arch/x86/Kconfig.debug @@ -122,6 +122,7 @@ config DEBUG_NX_TEST config 4KSTACKS bool "Use 4Kb for kernel stacks instead of 8Kb" depends on X86_32 + default y help If you say Y here the kernel will use a 4Kb stacksize for the kernel stack attached to each process/thread. This facilitates Index: linux-2.6.26/arch/x86/kernel/cpu/mtrr/generic.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/cpu/mtrr/generic.c +++ linux-2.6.26/arch/x86/kernel/cpu/mtrr/generic.c @@ -465,7 +465,7 @@ static unsigned long set_mtrr_state(void static unsigned long cr4 = 0; -static DEFINE_SPINLOCK(set_atomicity_lock); +static DEFINE_RAW_SPINLOCK(set_atomicity_lock); /* * Since we are disabling the cache don't allow any interrupts - they Index: linux-2.6.26/arch/x86/kernel/head_32.S =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/head_32.S +++ linux-2.6.26/arch/x86/kernel/head_32.S @@ -584,6 +584,7 @@ ignore_int: call printk #endif addl $(5*4),%esp + call dump_stack popl %ds popl %es popl %edx Index: linux-2.6.26/arch/x86/kernel/i8253.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/i8253.c +++ linux-2.6.26/arch/x86/kernel/i8253.c @@ -15,7 +15,7 @@ #include #include -DEFINE_SPINLOCK(i8253_lock); +DEFINE_RAW_SPINLOCK(i8253_lock); EXPORT_SYMBOL(i8253_lock); #ifdef CONFIG_X86_32 Index: linux-2.6.26/arch/x86/kernel/i8259_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/i8259_32.c +++ linux-2.6.26/arch/x86/kernel/i8259_32.c @@ -29,7 +29,7 @@ */ static int i8259A_auto_eoi; -DEFINE_SPINLOCK(i8259A_lock); +DEFINE_RAW_SPINLOCK(i8259A_lock); static void mask_and_ack_8259A(unsigned int); static struct irq_chip i8259A_chip = { Index: linux-2.6.26/arch/x86/kernel/io_apic_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/io_apic_32.c +++ linux-2.6.26/arch/x86/kernel/io_apic_32.c @@ -55,8 +55,8 @@ atomic_t irq_mis_count; /* Where if anywhere is the i8259 connect in external int mode */ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 }; -static DEFINE_SPINLOCK(ioapic_lock); -static DEFINE_SPINLOCK(vector_lock); +static DEFINE_RAW_SPINLOCK(ioapic_lock); +static DEFINE_RAW_SPINLOCK(vector_lock); int timer_over_8254 __initdata = 1; Index: linux-2.6.26/arch/x86/kernel/irq_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/irq_32.c +++ linux-2.6.26/arch/x86/kernel/irq_32.c @@ -79,6 +79,8 @@ unsigned int do_IRQ(struct pt_regs *regs u32 *isp; #endif + irq_show_regs_callback(smp_processor_id(), regs); + if (unlikely((unsigned)irq >= NR_IRQS)) { printk(KERN_EMERG "%s: cannot handle IRQ %d\n", __func__, irq); @@ -96,7 +98,7 @@ unsigned int do_IRQ(struct pt_regs *regs __asm__ __volatile__("andl %%esp,%0" : "=r" (sp) : "0" (THREAD_SIZE - 1)); if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) { - printk("do_IRQ: stack overflow: %ld\n", + printk("BUG: do_IRQ: stack overflow: %ld\n", sp - sizeof(struct thread_info)); dump_stack(); } Index: linux-2.6.26/arch/x86/kernel/microcode.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/microcode.c +++ linux-2.6.26/arch/x86/kernel/microcode.c @@ -117,7 +117,7 @@ MODULE_LICENSE("GPL"); #define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE) /* serialize access to the physical write to MSR 0x79 */ -static DEFINE_SPINLOCK(microcode_update_lock); +static DEFINE_RAW_SPINLOCK(microcode_update_lock); /* no concurrent ->write()s are allowed on /dev/cpu/microcode */ static DEFINE_MUTEX(microcode_mutex); Index: linux-2.6.26/arch/x86/kernel/nmi_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/nmi_32.c +++ linux-2.6.26/arch/x86/kernel/nmi_32.c @@ -57,7 +57,12 @@ static int endflag __initdata = 0; */ static __init void nmi_cpu_busy(void *data) { + /* + * avoid a warning, on PREEMPT_RT this wont run in hardirq context: + */ +#ifndef CONFIG_PREEMPT_RT local_irq_enable_in_hardirq(); +#endif /* Intentionally don't use cpu_relax here. This is to make sure that the performance counter really ticks, even if there is a simulator or similar that catches the Index: linux-2.6.26/arch/x86/kernel/process_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/process_32.c +++ linux-2.6.26/arch/x86/kernel/process_32.c @@ -230,8 +230,10 @@ void __show_registers(struct pt_regs *re regs->ax, regs->bx, regs->cx, regs->dx); printk("ESI: %08lx EDI: %08lx EBP: %08lx ESP: %08lx\n", regs->si, regs->di, regs->bp, sp); - printk(" DS: %04x ES: %04x FS: %04x GS: %04x SS: %04x\n", - (u16)regs->ds, (u16)regs->es, (u16)regs->fs, gs, ss); + printk(" DS: %04x ES: %04x FS: %04x GS: %04x SS: %04x" + " preempt:%08x\n", + (u16)regs->ds, (u16)regs->es, (u16)regs->fs, gs, ss, + preempt_count()); if (!all) return; @@ -303,15 +305,23 @@ void exit_thread(void) if (unlikely(test_thread_flag(TIF_IO_BITMAP))) { struct task_struct *tsk = current; struct thread_struct *t = &tsk->thread; - int cpu = get_cpu(); - struct tss_struct *tss = &per_cpu(init_tss, cpu); + void *io_bitmap_ptr = t->io_bitmap_ptr; + int cpu; + struct tss_struct *tss; - kfree(t->io_bitmap_ptr); + /* + * On PREEMPT_RT we must not call kfree() with + * preemption disabled, so we first zap the pointer: + */ t->io_bitmap_ptr = NULL; + kfree(io_bitmap_ptr); + clear_thread_flag(TIF_IO_BITMAP); /* * Careful, clear this in the TSS too: */ + cpu = get_cpu(); + tss = &per_cpu(init_tss, cpu); memset(tss->io_bitmap, 0xff, tss->io_bitmap_max); t->io_bitmap_max = 0; tss->io_bitmap_owner = NULL; Index: linux-2.6.26/arch/x86/kernel/signal_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/signal_32.c +++ linux-2.6.26/arch/x86/kernel/signal_32.c @@ -529,6 +529,13 @@ handle_signal(unsigned long sig, siginfo } } +#ifdef CONFIG_PREEMPT_RT + /* + * Fully-preemptible kernel does not need interrupts disabled: + */ + local_irq_enable(); + preempt_check_resched(); +#endif /* * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF * flag so that register information in the sigcontext is correct. @@ -583,6 +590,13 @@ static void do_signal(struct pt_regs *re int signr; sigset_t *oldset; +#ifdef CONFIG_PREEMPT_RT + /* + * Fully-preemptible kernel does not need interrupts disabled: + */ + local_irq_enable(); + preempt_check_resched(); +#endif /* * We want the common case to go fast, which is why we may in certain * cases get here from kernel mode. Just return without doing anything Index: linux-2.6.26/arch/x86/kernel/traps_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/traps_32.c +++ linux-2.6.26/arch/x86/kernel/traps_32.c @@ -328,6 +328,12 @@ void dump_stack(void) EXPORT_SYMBOL(dump_stack); +#if defined(CONFIG_DEBUG_STACKOVERFLOW) && defined(CONFIG_EVENT_TRACE) +extern unsigned long worst_stack_left; +#else +# define worst_stack_left -1L +#endif + void show_registers(struct pt_regs *regs) { int i; @@ -440,7 +446,7 @@ void die(const char *str, struct pt_regs u32 lock_owner; int lock_owner_depth; } die = { - .lock = __RAW_SPIN_LOCK_UNLOCKED, + .lock = RAW_SPIN_LOCK_UNLOCKED(die.lock), .lock_owner = -1, .lock_owner_depth = 0 }; @@ -451,7 +457,7 @@ void die(const char *str, struct pt_regs if (die.lock_owner != raw_smp_processor_id()) { console_verbose(); raw_local_irq_save(flags); - __raw_spin_lock(&die.lock); + spin_lock(&die.lock); die.lock_owner = smp_processor_id(); die.lock_owner_depth = 0; bust_spinlocks(1); @@ -471,7 +477,7 @@ void die(const char *str, struct pt_regs bust_spinlocks(0); die.lock_owner = -1; add_taint(TAINT_DIE); - __raw_spin_unlock(&die.lock); + spin_unlock(&die.lock); raw_local_irq_restore(flags); if (!regs) @@ -512,6 +518,11 @@ do_trap(int trapnr, int signr, char *str if (!user_mode(regs)) goto kernel_trap; +#ifdef CONFIG_PREEMPT_RT + local_irq_enable(); + preempt_check_resched(); +#endif + trap_signal: /* * We want error_code and trap_no set for userspace faults and @@ -789,6 +800,7 @@ void notrace __kprobes die_nmi(struct pt crash_kexec(regs); } + nmi_exit(); do_exit(SIGSEGV); } Index: linux-2.6.26/arch/x86/kernel/vm86_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/vm86_32.c +++ linux-2.6.26/arch/x86/kernel/vm86_32.c @@ -136,6 +136,7 @@ struct pt_regs *save_v86_state(struct ke local_irq_enable(); if (!current->thread.vm86_info) { + local_irq_disable(); printk("no vm86_info: BAD\n"); do_exit(SIGSEGV); } Index: linux-2.6.26/arch/x86/mm/fault.c =================================================================== --- linux-2.6.26.orig/arch/x86/mm/fault.c +++ linux-2.6.26/arch/x86/mm/fault.c @@ -364,6 +364,7 @@ static int is_f00f_bug(struct pt_regs *r nr = (address - idt_descr.address) >> 3; if (nr == 6) { + zap_rt_locks(); do_invalid_op(regs, 0); return 1; } Index: linux-2.6.26/arch/x86/mm/highmem_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/mm/highmem_32.c +++ linux-2.6.26/arch/x86/mm/highmem_32.c @@ -18,6 +18,27 @@ void kunmap(struct page *page) kunmap_high(page); } +void kunmap_virt(void *ptr) +{ + struct page *page; + + if ((unsigned long)ptr < PKMAP_ADDR(0)) + return; + page = pte_page(pkmap_page_table[PKMAP_NR((unsigned long)ptr)]); + kunmap(page); +} + +struct page *kmap_to_page(void *ptr) +{ + struct page *page; + + if ((unsigned long)ptr < PKMAP_ADDR(0)) + return virt_to_page(ptr); + page = pte_page(pkmap_page_table[PKMAP_NR((unsigned long)ptr)]); + return page; +} +EXPORT_SYMBOL_GPL(kmap_to_page); /* PREEMPT_RT converts some modules to use this */ + static void debug_kmap_atomic_prot(enum km_type type) { #ifdef CONFIG_DEBUG_HIGHMEM @@ -69,7 +90,7 @@ static void debug_kmap_atomic_prot(enum * However when holding an atomic kmap is is not legal to sleep, so atomic * kmaps are appropriate for short, tight code paths only. */ -void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot) +void *__kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot) { enum fixed_addresses idx; unsigned long vaddr; @@ -91,12 +112,12 @@ void *kmap_atomic_prot(struct page *page return (void *)vaddr; } -void *kmap_atomic(struct page *page, enum km_type type) +void *__kmap_atomic(struct page *page, enum km_type type) { return kmap_atomic_prot(page, type, kmap_prot); } -void kunmap_atomic(void *kvaddr, enum km_type type) +void __kunmap_atomic(void *kvaddr, enum km_type type) { unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id(); @@ -123,7 +144,7 @@ void kunmap_atomic(void *kvaddr, enum km /* This is the same as kmap_atomic() but can map memory that doesn't * have a struct page associated with it. */ -void *kmap_atomic_pfn(unsigned long pfn, enum km_type type) +void *__kmap_atomic_pfn(unsigned long pfn, enum km_type type) { enum fixed_addresses idx; unsigned long vaddr; @@ -138,7 +159,7 @@ void *kmap_atomic_pfn(unsigned long pfn, return (void*) vaddr; } -struct page *kmap_atomic_to_page(void *ptr) +struct page *__kmap_atomic_to_page(void *ptr) { unsigned long idx, vaddr = (unsigned long)ptr; pte_t *pte; @@ -153,5 +174,6 @@ struct page *kmap_atomic_to_page(void *p EXPORT_SYMBOL(kmap); EXPORT_SYMBOL(kunmap); -EXPORT_SYMBOL(kmap_atomic); -EXPORT_SYMBOL(kunmap_atomic); +EXPORT_SYMBOL(kunmap_virt); +EXPORT_SYMBOL(__kmap_atomic); +EXPORT_SYMBOL(__kunmap_atomic); Index: linux-2.6.26/arch/x86/pci/common.c =================================================================== --- linux-2.6.26.orig/arch/x86/pci/common.c +++ linux-2.6.26/arch/x86/pci/common.c @@ -75,7 +75,7 @@ int pcibios_scanned; * This interrupt-safe spinlock protects all accesses to PCI * configuration space. */ -DEFINE_SPINLOCK(pci_config_lock); +DEFINE_RAW_SPINLOCK(pci_config_lock); static int __devinit can_skip_ioresource_align(const struct dmi_system_id *d) { Index: linux-2.6.26/arch/x86/pci/direct.c =================================================================== --- linux-2.6.26.orig/arch/x86/pci/direct.c +++ linux-2.6.26/arch/x86/pci/direct.c @@ -220,16 +220,23 @@ static int __init pci_check_type1(void) unsigned int tmp; int works = 0; - local_irq_save(flags); + spin_lock_irqsave(&pci_config_lock, flags); outb(0x01, 0xCFB); tmp = inl(0xCF8); outl(0x80000000, 0xCF8); - if (inl(0xCF8) == 0x80000000 && pci_sanity_check(&pci_direct_conf1)) { - works = 1; + + if (inl(0xCF8) == 0x80000000) { + spin_unlock_irqrestore(&pci_config_lock, flags); + + if (pci_sanity_check(&pci_direct_conf1)) + works = 1; + + spin_lock_irqsave(&pci_config_lock, flags); } outl(tmp, 0xCF8); - local_irq_restore(flags); + + spin_unlock_irqrestore(&pci_config_lock, flags); return works; } @@ -239,17 +246,19 @@ static int __init pci_check_type2(void) unsigned long flags; int works = 0; - local_irq_save(flags); + spin_lock_irqsave(&pci_config_lock, flags); outb(0x00, 0xCFB); outb(0x00, 0xCF8); outb(0x00, 0xCFA); - if (inb(0xCF8) == 0x00 && inb(0xCFA) == 0x00 && - pci_sanity_check(&pci_direct_conf2)) { - works = 1; - } - local_irq_restore(flags); + if (inb(0xCF8) == 0x00 && inb(0xCFA) == 0x00) { + spin_unlock_irqrestore(&pci_config_lock, flags); + + if (pci_sanity_check(&pci_direct_conf2)) + works = 1; + } else + spin_unlock_irqrestore(&pci_config_lock, flags); return works; } Index: linux-2.6.26/arch/x86/pci/pci.h =================================================================== --- linux-2.6.26.orig/arch/x86/pci/pci.h +++ linux-2.6.26/arch/x86/pci/pci.h @@ -81,7 +81,7 @@ struct irq_routing_table { extern unsigned int pcibios_irq_mask; extern int pcibios_scanned; -extern spinlock_t pci_config_lock; +extern raw_spinlock_t pci_config_lock; extern int (*pcibios_enable_irq)(struct pci_dev *dev); extern void (*pcibios_disable_irq)(struct pci_dev *dev); Index: linux-2.6.26/include/asm-x86/highmem.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/highmem.h +++ linux-2.6.26/include/asm-x86/highmem.h @@ -61,6 +61,16 @@ extern void *kmap_high(struct page *page extern void kunmap_high(struct page *page); void *kmap(struct page *page); +extern void kunmap_virt(void *ptr); +extern struct page *kmap_to_page(void *ptr); +void kunmap(struct page *page); + +void *__kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot); +void *__kmap_atomic(struct page *page, enum km_type type); +void __kunmap_atomic(void *kvaddr, enum km_type type); +void *__kmap_atomic_pfn(unsigned long pfn, enum km_type type); +struct page *__kmap_atomic_to_page(void *ptr); + void kunmap(struct page *page); void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot); void *kmap_atomic(struct page *page, enum km_type type); @@ -74,6 +84,23 @@ struct page *kmap_atomic_to_page(void *p #define flush_cache_kmaps() do { } while (0) +/* + * on PREEMPT_RT kmap_atomic() is a wrapper that uses kmap(): + */ +#ifdef CONFIG_PREEMPT_RT +# define kmap_atomic_prot(page, type, prot) kmap(page) +# define kmap_atomic(page, type) kmap(page) +# define kmap_atomic_pfn(pfn, type) kmap(pfn_to_page(pfn)) +# define kunmap_atomic(kvaddr, type) kunmap_virt(kvaddr) +# define kmap_atomic_to_page(kvaddr) kmap_to_page(kvaddr) +#else +# define kmap_atomic_prot(page, type, prot) __kmap_atomic_prot(page, type, prot) +# define kmap_atomic(page, type) __kmap_atomic(page, type) +# define kmap_atomic_pfn(pfn, type) __kmap_atomic_pfn(pfn, type) +# define kunmap_atomic(kvaddr, type) __kunmap_atomic(kvaddr, type) +# define kmap_atomic_to_page(kvaddr) __kmap_atomic_to_page(kvaddr) +#endif + #endif /* __KERNEL__ */ #endif /* _ASM_HIGHMEM_H */ Index: linux-2.6.26/include/asm-x86/i8253.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/i8253.h +++ linux-2.6.26/include/asm-x86/i8253.h @@ -6,7 +6,7 @@ #define PIT_CH0 0x40 #define PIT_CH2 0x42 -extern spinlock_t i8253_lock; +extern raw_spinlock_t i8253_lock; extern struct clock_event_device *global_clock_event; Index: linux-2.6.26/include/asm-x86/mach-default/irq_vectors.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/mach-default/irq_vectors.h +++ linux-2.6.26/include/asm-x86/mach-default/irq_vectors.h @@ -63,7 +63,7 @@ * levels. (0x80 is the syscall vector) */ #define FIRST_DEVICE_VECTOR 0x31 -#define FIRST_SYSTEM_VECTOR 0xef +#define FIRST_SYSTEM_VECTOR 0xee #define TIMER_IRQ 0 Index: linux-2.6.26/include/asm-x86/tlbflush.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/tlbflush.h +++ linux-2.6.26/include/asm-x86/tlbflush.h @@ -7,6 +7,21 @@ #include #include +/* + * TLB-flush needs to be nonpreemptible on PREEMPT_RT due to the + * following complex race scenario: + * + * if the current task is lazy-TLB and does a TLB flush and + * gets preempted after the movl %%r3, %0 but before the + * movl %0, %%cr3 then its ->active_mm might change and it will + * install the wrong cr3 when it switches back. This is not a + * problem for the lazy-TLB task itself, but if the next task it + * switches to has an ->mm that is also the lazy-TLB task's + * new ->active_mm, then the scheduler will assume that cr3 is + * the new one, while we overwrote it with the old one. The result + * is the wrong cr3 in the new (non-lazy-TLB) task, which typically + * causes an infinite pagefault upon the next userspace access. + */ #ifdef CONFIG_PARAVIRT #include #else @@ -97,6 +112,13 @@ static inline void __flush_tlb_one(unsig static inline void flush_tlb_mm(struct mm_struct *mm) { + /* + * This is safe on PREEMPT_RT because if we preempt + * right after the check but before the __flush_tlb(), + * and if ->active_mm changes, then we might miss a + * TLB flush, but that TLB flush happened already when + * ->active_mm was changed: + */ if (mm == current->active_mm) __flush_tlb(); } Index: linux-2.6.26/include/asm-x86/xor_32.h =================================================================== --- linux-2.6.26.orig/include/asm-x86/xor_32.h +++ linux-2.6.26/include/asm-x86/xor_32.h @@ -862,7 +862,21 @@ static struct xor_block_template xor_blo #include #undef XOR_TRY_TEMPLATES -#define XOR_TRY_TEMPLATES \ +/* + * MMX/SSE ops disable preemption for long periods of time, + * so on PREEMPT_RT use the register-based ops only: + */ +#ifdef CONFIG_PREEMPT_RT +# define XOR_TRY_TEMPLATES \ + do { \ + xor_speed(&xor_block_8regs); \ + xor_speed(&xor_block_8regs_p); \ + xor_speed(&xor_block_32regs); \ + xor_speed(&xor_block_32regs_p); \ + } while (0) +# define XOR_SELECT_TEMPLATE(FASTEST) (FASTEST) +#else +# define XOR_TRY_TEMPLATES \ do { \ xor_speed(&xor_block_8regs); \ xor_speed(&xor_block_8regs_p); \ @@ -879,5 +893,6 @@ do { \ /* We force the use of the SSE xor block because it can write around L2. We may also be able to load into the L1 only depending on how the cpu deals with a load to a line that is being prefetched. */ -#define XOR_SELECT_TEMPLATE(FASTEST) \ +# define XOR_SELECT_TEMPLATE(FASTEST) \ (cpu_has_xmm ? &xor_block_pIII_sse : FASTEST) +#endif /* CONFIG_PREEMPT_RT */ patches/remove-check-pgt-cache-calls.patch0000664000076400007640000000067011043564026017557 0ustar tglxtglx--- arch/x86/kernel/process_32.c | 1 - 1 file changed, 1 deletion(-) Index: linux-2.6.26/arch/x86/kernel/process_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/process_32.c +++ linux-2.6.26/arch/x86/kernel/process_32.c @@ -170,7 +170,6 @@ void cpu_idle(void) while (!need_resched()) { void (*idle)(void); - check_pgt_cache(); rmb(); idle = pm_idle; patches/preempt-irqs-i386-idle-poll-loop-fix.patch0000664000076400007640000000073411043564026021014 0ustar tglxtglx--- arch/x86/kernel/process.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) Index: linux-2.6.26/arch/x86/kernel/process.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/process.c +++ linux-2.6.26/arch/x86/kernel/process.c @@ -107,7 +107,9 @@ static void mwait_idle(void) static void poll_idle(void) { local_irq_enable(); - cpu_relax(); + do { + cpu_relax(); + } while (!need_resched()); } /* patches/preempt-realtime-sched.patch0000664000076400007640000006166211043564026016632 0ustar tglxtglx--- include/linux/sched.h | 47 ++++++ kernel/sched.c | 362 +++++++++++++++++++++++++++++++++++++++++++------- kernel/sched_rt.c | 61 ++++++++ 3 files changed, 424 insertions(+), 46 deletions(-) Index: linux-2.6.26/include/linux/sched.h =================================================================== --- linux-2.6.26.orig/include/linux/sched.h +++ linux-2.6.26/include/linux/sched.h @@ -90,6 +90,16 @@ struct sched_param { #include +#ifdef CONFIG_PREEMPT +extern int kernel_preemption; +#else +# define kernel_preemption 0 +#endif +#ifdef CONFIG_PREEMPT_VOLUNTARY +extern int voluntary_preemption; +#else +# define voluntary_preemption 0 +#endif #ifdef CONFIG_PREEMPT_SOFTIRQS extern int softirq_preemption; #else @@ -225,6 +235,28 @@ extern struct semaphore kernel_sem; #define set_task_state(tsk, state_value) \ set_mb((tsk)->state, (state_value)) +// #define PREEMPT_DIRECT + +#ifdef CONFIG_X86_LOCAL_APIC +extern void nmi_show_all_regs(void); +#else +# define nmi_show_all_regs() do { } while (0) +#endif + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct exec_domain; + /* * set_current_state() includes a barrier so that the write of current->state * is correctly serialised wrt the caller's subsequent test of whether to @@ -355,6 +387,11 @@ extern signed long schedule_timeout_inte extern signed long schedule_timeout_killable(signed long timeout); extern signed long schedule_timeout_uninterruptible(signed long timeout); asmlinkage void schedule(void); +/* + * This one can be called with interrupts disabled, only + * to be used by lowlevel arch code! + */ +asmlinkage void __sched __schedule(void); struct nsproxy; struct user_namespace; @@ -1545,6 +1582,15 @@ extern struct pid *cad_pid; extern void free_task(struct task_struct *tsk); #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) +#ifdef CONFIG_PREEMPT_RT +extern void __put_task_struct_cb(struct rcu_head *rhp); + +static inline void put_task_struct(struct task_struct *t) +{ + if (atomic_dec_and_test(&t->usage)) + call_rcu(&t->rcu, __put_task_struct_cb); +} +#else extern void __put_task_struct(struct task_struct *t); static inline void put_task_struct(struct task_struct *t) @@ -1552,6 +1598,7 @@ static inline void put_task_struct(struc if (atomic_dec_and_test(&t->usage)) __put_task_struct(t); } +#endif /* * Per process flags Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -4,6 +4,7 @@ * Kernel scheduler and related syscalls * * Copyright (C) 1991-2002 Linus Torvalds + * Copyright (C) 2004 Red Hat, Inc., Ingo Molnar * * 1996-12-23 Modified by Dave Grothe to fix bugs in semaphores and * make semaphores SMP safe @@ -16,6 +17,7 @@ * by Davide Libenzi, preemptible kernel bits by Robert Love. * 2003-09-03 Interactivity tuning by Con Kolivas. * 2004-04-02 Scheduler domains code by Nick Piggin + * 2004-10-13 Real-Time Preemption support by Ingo Molnar * 2007-04-15 Work begun on replacing all interactivity tuning with a * fair scheduling design by Con Kolivas. * 2007-05-05 Load balancing (smp-nice) and other improvements @@ -59,6 +61,7 @@ #include #include #include +#include #include #include #include @@ -108,6 +111,20 @@ #define NICE_0_LOAD SCHED_LOAD_SCALE #define NICE_0_SHIFT SCHED_LOAD_SHIFT +#if (BITS_PER_LONG < 64) +#define JIFFIES_TO_NS64(TIME) \ + ((unsigned long long)(TIME) * ((unsigned long) (1000000000 / HZ))) + +#define NS64_TO_JIFFIES(TIME) \ + ((((unsigned long long)((TIME)) >> BITS_PER_LONG) * \ + (1 + NS_TO_JIFFIES(~0UL))) + NS_TO_JIFFIES((unsigned long)(TIME))) +#else /* BITS_PER_LONG < 64 */ + +#define NS64_TO_JIFFIES(TIME) NS_TO_JIFFIES(TIME) +#define JIFFIES_TO_NS64(TIME) JIFFIES_TO_NS(TIME) + +#endif /* BITS_PER_LONG < 64 */ + /* * These are the 'tuning knobs' of the scheduler: * @@ -142,6 +159,32 @@ static inline void sg_inc_cpu_power(stru } #endif +#define TASK_PREEMPTS_CURR(p, rq) \ + ((p)->prio < (rq)->curr->prio) + +/* + * Tweaks for current + */ + +#ifdef CURRENT_PTR +struct task_struct * const ___current = &init_task; +struct task_struct ** const current_ptr = (struct task_struct ** const)&___current; +struct thread_info * const current_ti = &init_thread_union.thread_info; +struct thread_info ** const current_ti_ptr = (struct thread_info ** const)¤t_ti; + +EXPORT_SYMBOL(___current); +EXPORT_SYMBOL(current_ti); + +/* + * The scheduler itself doesnt want 'current' to be cached + * during context-switches: + */ +# undef current +# define current __current() +# undef current_thread_info +# define current_thread_info() __current_thread_info() +#endif + static inline int rt_policy(int policy) { if (unlikely(policy == SCHED_FIFO || policy == SCHED_RR)) @@ -423,6 +466,7 @@ struct rt_rq { unsigned long rt_nr_migratory; int overloaded; #endif + unsigned long rt_nr_uninterruptible; int rt_throttled; u64 rt_time; u64 rt_runtime; @@ -482,7 +526,7 @@ static struct root_domain def_root_domai */ struct rq { /* runqueue lock: */ - spinlock_t lock; + raw_spinlock_t lock; /* * nr_running and cpu_load should be in the same cacheline because @@ -520,6 +564,8 @@ struct rq { */ unsigned long nr_uninterruptible; + unsigned long switch_timestamp; + unsigned long slice_avg; struct task_struct *curr, *idle; unsigned long next_balance; struct mm_struct *prev_mm; @@ -569,6 +615,13 @@ struct rq { /* BKL stats */ unsigned int bkl_count; + + /* RT-overload stats: */ + unsigned long rto_schedule; + unsigned long rto_schedule_tail; + unsigned long rto_wakeup; + unsigned long rto_pulled; + unsigned long rto_pushed; #endif struct lock_class_key rq_lock_key; }; @@ -880,11 +933,23 @@ unsigned long long notrace cpu_clock(int } EXPORT_SYMBOL_GPL(cpu_clock); +/* + * We really dont want to do anything complex within switch_to() + * on PREEMPT_RT - this check enforces this. + */ +#ifdef prepare_arch_switch +# ifdef CONFIG_PREEMPT_RT +# error FIXME +# else +# define _finish_arch_switch finish_arch_switch +# endif +#endif + #ifndef prepare_arch_switch # define prepare_arch_switch(next) do { } while (0) #endif #ifndef finish_arch_switch -# define finish_arch_switch(prev) do { } while (0) +# define _finish_arch_switch(prev) do { } while (0) #endif static inline int task_current(struct rq *rq, struct task_struct *p) @@ -915,7 +980,7 @@ static inline void finish_lock_switch(st */ spin_acquire(&rq->lock.dep_map, 0, 0, _THIS_IP_); - spin_unlock_irq(&rq->lock); + spin_unlock(&rq->lock); } #else /* __ARCH_WANT_UNLOCKED_CTXSW */ @@ -956,8 +1021,8 @@ static inline void finish_lock_switch(st smp_wmb(); prev->oncpu = 0; #endif -#ifndef __ARCH_WANT_INTERRUPTS_ON_CTXSW - local_irq_enable(); +#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW + local_irq_disable(); #endif } #endif /* __ARCH_WANT_UNLOCKED_CTXSW */ @@ -1609,6 +1674,8 @@ static inline int normal_prio(struct tas prio = MAX_RT_PRIO-1 - p->rt_priority; else prio = __normal_prio(p); + +// trace_special_pid(p->pid, PRIO(p), __PRIO(prio)); return prio; } @@ -2117,6 +2184,13 @@ try_to_wake_up(struct task_struct *p, un if (!sched_feat(SYNC_WAKEUPS)) sync = 0; +#ifdef CONFIG_PREEMPT_RT + /* + * sync wakeups can increase wakeup latencies: + */ + if (rt_task(p)) + sync = 0; +#endif smp_wmb(); rq = task_rq_lock(p, &flags); old_state = p->state; @@ -2186,7 +2260,10 @@ out_running: p->pid, p->state, rq, p, rq->curr); check_preempt_curr(rq, p); - p->state = TASK_RUNNING; + if (mutex) + p->state = TASK_RUNNING_MUTEX; + else + p->state = TASK_RUNNING; #ifdef CONFIG_SMP if (p->sched_class->task_wake_up) p->sched_class->task_wake_up(rq, p); @@ -2487,7 +2564,7 @@ static void finish_task_switch(struct rq * Manfred Spraul */ prev_state = prev->state; - finish_arch_switch(prev); + _finish_arch_switch(prev); finish_lock_switch(rq, prev); #ifdef CONFIG_SMP if (current->sched_class->post_schedule) @@ -2514,12 +2591,15 @@ static void finish_task_switch(struct rq asmlinkage void schedule_tail(struct task_struct *prev) __releases(rq->lock) { - struct rq *rq = this_rq(); - - finish_task_switch(rq, prev); + preempt_disable(); // TODO: move this to fork setup + finish_task_switch(this_rq(), prev); + __preempt_enable_no_resched(); + local_irq_enable(); #ifdef __ARCH_WANT_UNLOCKED_CTXSW /* In this case, finish_task_switch does not reenable preemption */ preempt_enable(); +#else + preempt_check_resched(); #endif if (current->set_child_tid) put_user(task_pid_vnr(current), current->set_child_tid); @@ -2571,6 +2651,11 @@ context_switch(struct rq *rq, struct tas spin_release(&rq->lock.dep_map, 1, _THIS_IP_); #endif +#ifdef CURRENT_PTR + barrier(); + *current_ptr = next; + *current_ti_ptr = next->thread_info; +#endif /* Here we just switch the register state and the stack. */ switch_to(prev, next, prev); @@ -2617,6 +2702,11 @@ unsigned long nr_uninterruptible(void) return sum; } +unsigned long nr_uninterruptible_cpu(int cpu) +{ + return cpu_rq(cpu)->nr_uninterruptible; +} + unsigned long long nr_context_switches(void) { int i; @@ -4103,6 +4193,8 @@ void scheduler_tick(void) sched_clock_tick(); + BUG_ON(!irqs_disabled()); + spin_lock(&rq->lock); update_rq_clock(rq); update_cpu_load(rq); @@ -4194,8 +4286,8 @@ static noinline void __schedule_bug(stru { struct pt_regs *regs = get_irq_regs(); - printk(KERN_ERR "BUG: scheduling while atomic: %s/%d/0x%08x\n", - prev->comm, prev->pid, preempt_count()); + printk(KERN_ERR "BUG: scheduling while atomic: %s/0x%08x/%d, CPU#%d\n", + prev->comm, preempt_count(), prev->pid, smp_processor_id()); debug_show_held_locks(prev); if (irqs_disabled()) @@ -4212,6 +4304,8 @@ static noinline void __schedule_bug(stru */ static inline void schedule_debug(struct task_struct *prev) { + WARN_ON(system_state == SYSTEM_BOOTING); + /* * Test if we are atomic. Since do_exit() needs to call into * schedule() atomically, we ignore that path for now. @@ -4266,7 +4360,7 @@ pick_next_task(struct rq *rq, struct tas /* * schedule() is the main scheduler function. */ -asmlinkage void __sched schedule(void) +asmlinkage void __sched __schedule(void) { struct task_struct *prev, *next; unsigned long *switch_count; @@ -4275,7 +4369,6 @@ asmlinkage void __sched schedule(void) rcu_preempt_boost(); -need_resched: preempt_disable(); cpu = smp_processor_id(); rq = cpu_rq(cpu); @@ -4284,7 +4377,6 @@ need_resched: switch_count = &prev->nivcsw; release_kernel_lock(prev); -need_resched_nonpreemptible: schedule_debug(prev); @@ -4298,14 +4390,20 @@ need_resched_nonpreemptible: spin_lock(&rq->lock); clear_tsk_need_resched(prev); - if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) { + if ((prev->state & ~TASK_RUNNING_MUTEX) && + !(preempt_count() & PREEMPT_ACTIVE)) { if (unlikely(signal_pending_state(prev->state, prev))) prev->state = TASK_RUNNING; - else + else { + touch_softlockup_watchdog(); deactivate_task(rq, prev, 1); + } switch_count = &prev->nvcsw; } + if (preempt_count() & PREEMPT_ACTIVE) + sub_preempt_count(PREEMPT_ACTIVE); + #ifdef CONFIG_SMP if (prev->sched_class->pre_schedule) prev->sched_class->pre_schedule(rq, prev); @@ -4331,21 +4429,91 @@ need_resched_nonpreemptible: */ cpu = smp_processor_id(); rq = cpu_rq(cpu); - } else - spin_unlock_irq(&rq->lock); + __preempt_enable_no_resched(); + } else { + __preempt_enable_no_resched(); + spin_unlock(&rq->lock); + } hrtick_set(rq); - if (unlikely(reacquire_kernel_lock(current) < 0)) - goto need_resched_nonpreemptible; + reacquire_kernel_lock(current); + if (!irqs_disabled()) { + static int once = 1; + if (once) { + once = 0; + print_irqtrace_events(current); + WARN_ON(1); + } + } +} - __preempt_enable_no_resched(); - if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) - goto need_resched; +/* + * schedule() is the main scheduler function. + */ +asmlinkage void __sched schedule(void) +{ + WARN_ON(system_state == SYSTEM_BOOTING); + /* + * Test if we have interrupts disabled. + */ + if (unlikely(irqs_disabled())) { + printk(KERN_ERR "BUG: scheduling with irqs disabled: " + "%s/0x%08x/%d\n", current->comm, preempt_count(), + current->pid); + print_symbol("caller is %s\n", + (long)__builtin_return_address(0)); + dump_stack(); + } + + if (unlikely(current->flags & PF_NOSCHED)) { + current->flags &= ~PF_NOSCHED; + printk(KERN_ERR "%s:%d userspace BUG: scheduling in " + "user-atomic context!\n", current->comm, current->pid); + dump_stack(); + send_sig(SIGUSR2, current, 1); + } + + local_irq_disable(); + + do { + __schedule(); + } while (unlikely(test_thread_flag(TIF_NEED_RESCHED))); + + local_irq_enable(); } EXPORT_SYMBOL(schedule); #ifdef CONFIG_PREEMPT + +/* + * Global flag to turn preemption off on a CONFIG_PREEMPT kernel: + */ +int kernel_preemption = 1; + +static int __init preempt_setup (char *str) +{ + if (!strncmp(str, "off", 3)) { + if (kernel_preemption) { + printk(KERN_INFO "turning off kernel preemption!\n"); + kernel_preemption = 0; + } + return 1; + } + if (!strncmp(str, "on", 2)) { + if (!kernel_preemption) { + printk(KERN_INFO "turning on kernel preemption!\n"); + kernel_preemption = 1; + } + return 1; + } + get_option(&str, &kernel_preemption); + + return 1; +} + +__setup("preempt=", preempt_setup); + /* * this is the entry point to schedule() from in-kernel preemption * off of preempt_enable. Kernel preemptions off return from interrupt @@ -4357,6 +4525,8 @@ asmlinkage void __sched preempt_schedule struct task_struct *task = current; int saved_lock_depth; + if (!kernel_preemption) + return; /* * If there is a non-zero preempt_count or interrupts are disabled, * we do not want to preempt the current task. Just return.. @@ -4365,6 +4535,7 @@ asmlinkage void __sched preempt_schedule return; do { + local_irq_disable(); add_preempt_count(PREEMPT_ACTIVE); /* @@ -4374,9 +4545,9 @@ asmlinkage void __sched preempt_schedule */ saved_lock_depth = task->lock_depth; task->lock_depth = -1; - schedule(); + __schedule(); task->lock_depth = saved_lock_depth; - sub_preempt_count(PREEMPT_ACTIVE); + local_irq_enable(); /* * Check again in case we missed a preemption opportunity @@ -4388,10 +4559,10 @@ asmlinkage void __sched preempt_schedule EXPORT_SYMBOL(preempt_schedule); /* - * this is the entry point to schedule() from kernel preemption - * off of irq context. - * Note, that this is called and return with irqs disabled. This will - * protect us against recursive calling from irq. + * this is is the entry point for the IRQ return path. Called with + * interrupts disabled. To avoid infinite irq-entry recursion problems + * with fast-paced IRQ sources we do all of this carefully to never + * enable interrupts again. */ asmlinkage void __sched preempt_schedule_irq(void) { @@ -4399,10 +4570,17 @@ asmlinkage void __sched preempt_schedule struct task_struct *task = current; int saved_lock_depth; - /* Catch callers which need to be fixed */ - WARN_ON_ONCE(ti->preempt_count || !irqs_disabled()); + if (!kernel_preemption) + return; + /* + * If there is a non-zero preempt_count then just return. + * (interrupts are disabled) + */ + if (unlikely(ti->preempt_count)) + return; do { + local_irq_disable(); add_preempt_count(PREEMPT_ACTIVE); /* @@ -4412,11 +4590,9 @@ asmlinkage void __sched preempt_schedule */ saved_lock_depth = task->lock_depth; task->lock_depth = -1; - local_irq_enable(); - schedule(); + __schedule(); local_irq_disable(); task->lock_depth = saved_lock_depth; - sub_preempt_count(PREEMPT_ACTIVE); /* * Check again in case we missed a preemption opportunity @@ -4708,6 +4884,8 @@ void task_setprio(struct task_struct *p, p->prio = prio; +// trace_special_pid(p->pid, __PRIO(oldprio), PRIO(p)); + if (running) p->sched_class->set_curr_task(rq); if (on_rq) { @@ -4715,6 +4893,8 @@ void task_setprio(struct task_struct *p, check_class_changed(rq, p, prev_class, oldprio, running); } +// trace_special(prev_resched, _need_resched(), 0); + task_rq_unlock(rq, &flags); } @@ -5315,14 +5495,17 @@ asmlinkage long sys_sched_yield(void) */ spin_unlock_no_resched(&rq->lock); - schedule(); + __schedule(); + + local_irq_enable(); + preempt_check_resched(); return 0; } static void __cond_resched(void) { -#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP +#if defined(CONFIG_DEBUG_SPINLOCK_SLEEP) || defined(CONFIG_DEBUG_PREEMPT) __might_sleep(__FILE__, __LINE__); #endif /* @@ -5331,10 +5514,11 @@ static void __cond_resched(void) * cond_resched() call. */ do { + local_irq_disable(); add_preempt_count(PREEMPT_ACTIVE); - schedule(); - sub_preempt_count(PREEMPT_ACTIVE); + __schedule(); } while (need_resched()); + local_irq_enable(); } int __sched _cond_resched(void) @@ -5374,6 +5558,25 @@ int __cond_resched_raw_spinlock(raw_spin } EXPORT_SYMBOL(__cond_resched_raw_spinlock); +#ifdef CONFIG_PREEMPT_RT + +int __cond_resched_spinlock(spinlock_t *lock) +{ +#if (defined(CONFIG_SMP) && defined(CONFIG_PREEMPT)) || defined(CONFIG_PREEMPT_RT) + if (lock->break_lock) { + lock->break_lock = 0; + spin_unlock_no_resched(lock); + __cond_resched(); + spin_lock(lock); + return 1; + } +#endif + return 0; +} +EXPORT_SYMBOL(__cond_resched_spinlock); + +#endif + /* * Voluntarily preempt a process context that has softirqs disabled: */ @@ -5420,11 +5623,15 @@ int cond_resched_hardirq_context(void) WARN_ON_ONCE(!irqs_disabled()); if (hardirq_need_resched()) { +#ifndef CONFIG_PREEMPT_RT irq_exit(); +#endif local_irq_enable(); __cond_resched(); +#ifndef CONFIG_PREEMPT_RT local_irq_disable(); __irq_enter(); +#endif return 1; } @@ -5432,17 +5639,58 @@ int cond_resched_hardirq_context(void) } EXPORT_SYMBOL(cond_resched_hardirq_context); +#ifdef CONFIG_PREEMPT_VOLUNTARY + +int voluntary_preemption = 1; + +EXPORT_SYMBOL(voluntary_preemption); + +static int __init voluntary_preempt_setup (char *str) +{ + if (!strncmp(str, "off", 3)) + voluntary_preemption = 0; + else + get_option(&str, &voluntary_preemption); + if (!voluntary_preemption) + printk("turning off voluntary preemption!\n"); + + return 1; +} + +__setup("voluntary-preempt=", voluntary_preempt_setup); + +#endif + /** * yield - yield the current processor to other threads. * * This is a shortcut for kernel-space yielding - it marks the * thread runnable and calls sys_sched_yield(). */ -void __sched yield(void) +void __sched __yield(void) { set_current_state(TASK_RUNNING); sys_sched_yield(); } + +void __sched yield(void) +{ + static int once = 1; + + /* + * it's a bug to rely on yield() with RT priorities. We print + * the first occurance after bootup ... this will still give + * us an idea about the scope of the problem, without spamming + * the syslog: + */ + if (once && rt_task(current)) { + once = 0; + printk(KERN_ERR "BUG: %s:%d RT task yield()-ing!\n", + current->comm, current->pid); + dump_stack(); + } + __yield(); +} EXPORT_SYMBOL(yield); /* @@ -5624,6 +5872,7 @@ void sched_show_task(struct task_struct void show_state_filter(unsigned long state_filter) { struct task_struct *g, *p; + int do_unlock = 1; #if BITS_PER_LONG == 32 printk(KERN_INFO @@ -5632,7 +5881,16 @@ void show_state_filter(unsigned long sta printk(KERN_INFO " task PC stack pid father\n"); #endif +#ifdef CONFIG_PREEMPT_RT + if (!read_trylock(&tasklist_lock)) { + printk("hm, tasklist_lock write-locked.\n"); + printk("ignoring ...\n"); + do_unlock = 0; + } +#else read_lock(&tasklist_lock); +#endif + do_each_thread(g, p) { /* * reset the NMI-timeout, listing all files on a slow @@ -5648,7 +5906,8 @@ void show_state_filter(unsigned long sta #ifdef CONFIG_SCHED_DEBUG sysrq_sched_debug_show(); #endif - read_unlock(&tasklist_lock); + if (do_unlock) + read_unlock(&tasklist_lock); /* * Only show locks if all tasks are dumped: */ @@ -5810,11 +6069,18 @@ EXPORT_SYMBOL_GPL(set_cpus_allowed_ptr); static int __migrate_task(struct task_struct *p, int src_cpu, int dest_cpu) { struct rq *rq_dest, *rq_src; + unsigned long flags; int ret = 0, on_rq; if (unlikely(cpu_is_offline(dest_cpu))) return ret; + /* + * PREEMPT_RT: this relies on write_lock_irq(&tasklist_lock) + * disabling interrupts - which on PREEMPT_RT does not do: + */ + local_irq_save(flags); + rq_src = cpu_rq(src_cpu); rq_dest = cpu_rq(dest_cpu); @@ -5839,6 +6105,8 @@ done: ret = 1; fail: double_rq_unlock(rq_src, rq_dest); + local_irq_restore(flags); + return ret; } @@ -8047,6 +8315,9 @@ void __init sched_init(void) atomic_inc(&init_mm.mm_count); enter_lazy_tlb(&init_mm, current); +#ifdef CONFIG_PREEMPT_RT + printk("Real-Time Preemption Support (C) 2004-2007 Ingo Molnar\n"); +#endif /* * Make us the idle thread. Technically, schedule() should not be * called from this thread, however somewhere below it might be, @@ -8070,13 +8341,16 @@ void __might_sleep(char *file, int line) if ((in_atomic() || irqs_disabled()) && system_state == SYSTEM_RUNNING && !oops_in_progress) { + if (debug_direct_keyboard && hardirq_count()) + return; if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy) return; prev_jiffy = jiffies; printk(KERN_ERR "BUG: sleeping function called from invalid" - " context at %s:%d\n", file, line); - printk("in_atomic():%d, irqs_disabled():%d\n", - in_atomic(), irqs_disabled()); + " context %s(%d) at %s:%d\n", + current->comm, current->pid, file, line); + printk("in_atomic():%d [%08x], irqs_disabled():%d\n", + in_atomic(), preempt_count(), irqs_disabled()); debug_show_held_locks(current); if (irqs_disabled()) print_irqtrace_events(current); Index: linux-2.6.26/kernel/sched_rt.c =================================================================== --- linux-2.6.26.orig/kernel/sched_rt.c +++ linux-2.6.26/kernel/sched_rt.c @@ -533,6 +533,48 @@ static void dequeue_rt_entity(struct sch } } +static inline void incr_rt_nr_uninterruptible(struct task_struct *p, + struct rq *rq) +{ + rq->rt.rt_nr_uninterruptible++; +} + +static inline void decr_rt_nr_uninterruptible(struct task_struct *p, + struct rq *rq) +{ + rq->rt.rt_nr_uninterruptible--; +} + +unsigned long rt_nr_running(void) +{ + unsigned long i, sum = 0; + + for_each_online_cpu(i) + sum += cpu_rq(i)->rt.rt_nr_running; + + return sum; +} + +unsigned long rt_nr_running_cpu(int cpu) +{ + return cpu_rq(cpu)->rt.rt_nr_running; +} + +unsigned long rt_nr_uninterruptible(void) +{ + unsigned long i, sum = 0; + + for_each_online_cpu(i) + sum += cpu_rq(i)->rt.rt_nr_uninterruptible; + + return sum; +} + +unsigned long rt_nr_uninterruptible_cpu(int cpu) +{ + return cpu_rq(cpu)->rt.rt_nr_uninterruptible; +} + /* * Adding/removing a task to/from a priority array: */ @@ -544,6 +586,9 @@ static void enqueue_task_rt(struct rq *r rt_se->timeout = 0; enqueue_rt_entity(rt_se); + + if (p->state == TASK_UNINTERRUPTIBLE) + decr_rt_nr_uninterruptible(p, rq); } static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep) @@ -551,6 +596,10 @@ static void dequeue_task_rt(struct rq *r struct sched_rt_entity *rt_se = &p->rt; update_curr_rt(rq); + + if (p->state == TASK_UNINTERRUPTIBLE) + incr_rt_nr_uninterruptible(p, rq); + dequeue_rt_entity(rt_se); } @@ -909,6 +958,8 @@ static int push_rt_task(struct rq *rq) resched_task(lowest_rq->curr); + schedstat_inc(rq, rto_pushed); + spin_unlock(&lowest_rq->lock); ret = 1; @@ -1013,6 +1064,7 @@ static int pull_rt_task(struct rq *this_ */ next = p; + schedstat_inc(src_rq, rto_pulled); } skip: spin_unlock(&src_rq->lock); @@ -1024,8 +1076,10 @@ static int pull_rt_task(struct rq *this_ static void pre_schedule_rt(struct rq *rq, struct task_struct *prev) { /* Try to pull RT tasks here if we lower this rq's prio */ - if (unlikely(rt_task(prev)) && rq->rt.highest_prio > prev->prio) + if (unlikely(rt_task(prev)) && rq->rt.highest_prio > prev->prio) { pull_rt_task(rq); + schedstat_inc(rq, rto_schedule); + } } static void post_schedule_rt(struct rq *rq) @@ -1040,6 +1094,7 @@ static void post_schedule_rt(struct rq * if (unlikely(rq->rt.overloaded)) { spin_lock_irq(&rq->lock); push_rt_tasks(rq); + schedstat_inc(rq, rto_schedule_tail); spin_unlock_irq(&rq->lock); } } @@ -1052,8 +1107,10 @@ static void task_wake_up_rt(struct rq *r { if (!task_running(rq, p) && !test_tsk_need_resched(rq->curr) && - rq->rt.overloaded) + rq->rt.overloaded) { push_rt_tasks(rq); + schedstat_inc(rq, rto_wakeup); + } } static unsigned long patches/preempt-realtime-mmdrop-delayed.patch0000664000076400007640000001624511043564026020444 0ustar tglxtglx--- include/linux/mm_types.h | 3 + include/linux/sched.h | 8 ++ kernel/fork.c | 141 +++++++++++++++++++++++++++++++++++++++++++++++ kernel/sched.c | 6 +- 4 files changed, 157 insertions(+), 1 deletion(-) Index: linux-2.6.26/include/linux/mm_types.h =================================================================== --- linux-2.6.26.orig/include/linux/mm_types.h +++ linux-2.6.26/include/linux/mm_types.h @@ -206,6 +206,9 @@ struct mm_struct { /* Architecture-specific MM context */ mm_context_t context; + /* realtime bits */ + struct list_head delayed_drop; + /* Swap token stuff */ /* * Last value of global fault stamp as seen by this process. Index: linux-2.6.26/include/linux/sched.h =================================================================== --- linux-2.6.26.orig/include/linux/sched.h +++ linux-2.6.26/include/linux/sched.h @@ -1960,12 +1960,20 @@ extern struct mm_struct * mm_alloc(void) /* mmdrop drops the mm and the page tables */ extern void __mmdrop(struct mm_struct *); +extern void __mmdrop_delayed(struct mm_struct *); + static inline void mmdrop(struct mm_struct * mm) { if (unlikely(atomic_dec_and_test(&mm->mm_count))) __mmdrop(mm); } +static inline void mmdrop_delayed(struct mm_struct * mm) +{ + if (atomic_dec_and_test(&mm->mm_count)) + __mmdrop_delayed(mm); +} + /* mmput gets rid of the mappings and all user-space */ extern void mmput(struct mm_struct *); /* Grab a reference to a task's mm, if it is not already going away */ Index: linux-2.6.26/kernel/fork.c =================================================================== --- linux-2.6.26.orig/kernel/fork.c +++ linux-2.6.26/kernel/fork.c @@ -35,6 +35,7 @@ #include #include #include +#include #include #include #include @@ -43,6 +44,8 @@ #include #include #include +#include +#include #include #include #include @@ -74,6 +77,15 @@ DEFINE_PER_CPU(unsigned long, process_co __cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */ +/* + * Delayed mmdrop. In the PREEMPT_RT case we + * dont want to do this from the scheduling + * context. + */ +static DEFINE_PER_CPU(struct task_struct *, desched_task); + +static DEFINE_PER_CPU(struct list_head, delayed_drop_list); + int nr_processes(void) { int cpu; @@ -143,6 +155,8 @@ void __put_task_struct(struct task_struc void __init fork_init(unsigned long mempages) { + int i; + #ifndef __HAVE_ARCH_TASK_STRUCT_ALLOCATOR #ifndef ARCH_MIN_TASKALIGN #define ARCH_MIN_TASKALIGN L1_CACHE_BYTES @@ -173,6 +187,9 @@ void __init fork_init(unsigned long memp init_task.signal->rlim[RLIMIT_NPROC].rlim_max = max_threads/2; init_task.signal->rlim[RLIMIT_SIGPENDING] = init_task.signal->rlim[RLIMIT_NPROC]; + + for (i = 0; i < NR_CPUS; i++) + INIT_LIST_HEAD(&per_cpu(delayed_drop_list, i)); } int __attribute__((weak)) arch_dup_task_struct(struct task_struct *dst, @@ -250,6 +267,7 @@ static int dup_mmap(struct mm_struct *mm mm->locked_vm = 0; mm->mmap = NULL; mm->mmap_cache = NULL; + INIT_LIST_HEAD(&mm->delayed_drop); mm->free_area_cache = oldmm->mmap_base; mm->cached_hole_size = ~0UL; mm->map_count = 0; @@ -1224,7 +1242,9 @@ static struct task_struct *copy_process( attach_pid(p, PIDTYPE_PGID, task_pgrp(current)); attach_pid(p, PIDTYPE_SID, task_session(current)); list_add_tail_rcu(&p->tasks, &init_task.tasks); + preempt_disable(); __get_cpu_var(process_counts)++; + preempt_enable(); } attach_pid(p, PIDTYPE_PID, pid); nr_threads++; @@ -1690,3 +1710,124 @@ int unshare_files(struct files_struct ** task_unlock(task); return 0; } + +static int mmdrop_complete(void) +{ + struct list_head *head; + int ret = 0; + + head = &get_cpu_var(delayed_drop_list); + while (!list_empty(head)) { + struct mm_struct *mm = list_entry(head->next, + struct mm_struct, delayed_drop); + list_del(&mm->delayed_drop); + put_cpu_var(delayed_drop_list); + + __mmdrop(mm); + ret = 1; + + head = &get_cpu_var(delayed_drop_list); + } + put_cpu_var(delayed_drop_list); + + return ret; +} + +/* + * We dont want to do complex work from the scheduler, thus + * we delay the work to a per-CPU worker thread: + */ +void __mmdrop_delayed(struct mm_struct *mm) +{ + struct task_struct *desched_task; + struct list_head *head; + + head = &get_cpu_var(delayed_drop_list); + list_add_tail(&mm->delayed_drop, head); + desched_task = __get_cpu_var(desched_task); + if (desched_task) + wake_up_process(desched_task); + put_cpu_var(delayed_drop_list); +} + +static int desched_thread(void * __bind_cpu) +{ + set_user_nice(current, -10); + current->flags |= PF_NOFREEZE | PF_SOFTIRQ; + + set_current_state(TASK_INTERRUPTIBLE); + + while (!kthread_should_stop()) { + + if (mmdrop_complete()) + continue; + schedule(); + + /* + * This must be called from time to time on ia64, and is a + * no-op on other archs. Used to be in cpu_idle(), but with + * the new -rt semantics it can't stay there. + */ + check_pgt_cache(); + + set_current_state(TASK_INTERRUPTIBLE); + } + __set_current_state(TASK_RUNNING); + return 0; +} + +static int __devinit cpu_callback(struct notifier_block *nfb, + unsigned long action, + void *hcpu) +{ + int hotcpu = (unsigned long)hcpu; + struct task_struct *p; + + switch (action) { + case CPU_UP_PREPARE: + + BUG_ON(per_cpu(desched_task, hotcpu)); + INIT_LIST_HEAD(&per_cpu(delayed_drop_list, hotcpu)); + p = kthread_create(desched_thread, hcpu, "desched/%d", hotcpu); + if (IS_ERR(p)) { + printk("desched_thread for %i failed\n", hotcpu); + return NOTIFY_BAD; + } + per_cpu(desched_task, hotcpu) = p; + kthread_bind(p, hotcpu); + break; + case CPU_ONLINE: + + wake_up_process(per_cpu(desched_task, hotcpu)); + break; +#ifdef CONFIG_HOTPLUG_CPU + case CPU_UP_CANCELED: + + /* Unbind so it can run. Fall thru. */ + kthread_bind(per_cpu(desched_task, hotcpu), smp_processor_id()); + case CPU_DEAD: + + p = per_cpu(desched_task, hotcpu); + per_cpu(desched_task, hotcpu) = NULL; + kthread_stop(p); + takeover_tasklets(hotcpu); + break; +#endif /* CONFIG_HOTPLUG_CPU */ + } + return NOTIFY_OK; +} + +static struct notifier_block __devinitdata cpu_nfb = { + .notifier_call = cpu_callback +}; + +__init int spawn_desched_task(void) +{ + void *cpu = (void *)(long)smp_processor_id(); + + cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu); + cpu_callback(&cpu_nfb, CPU_ONLINE, cpu); + register_cpu_notifier(&cpu_nfb); + return 0; +} + Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -2572,8 +2572,12 @@ static void finish_task_switch(struct rq #endif fire_sched_in_preempt_notifiers(current); + /* + * Delay the final freeing of the mm or task, so that we dont have + * to do complex work from within the scheduler: + */ if (mm) - mmdrop(mm); + mmdrop_delayed(mm); if (unlikely(prev_state == TASK_DEAD)) { /* * Remove function-return probe instances associated with this patches/preempt-realtime-sched-i386.patch0000664000076400007640000000354111043564026017311 0ustar tglxtglx--- arch/x86/kernel/entry_32.S | 11 +++++++---- arch/x86/kernel/process_32.c | 4 +++- 2 files changed, 10 insertions(+), 5 deletions(-) Index: linux-2.6.26/arch/x86/kernel/entry_32.S =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/entry_32.S +++ linux-2.6.26/arch/x86/kernel/entry_32.S @@ -260,14 +260,18 @@ END(ret_from_exception) #ifdef CONFIG_PREEMPT ENTRY(resume_kernel) DISABLE_INTERRUPTS(CLBR_ANY) + cmpl $0, kernel_preemption + jz restore_nocheck cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ? jnz restore_nocheck need_resched: movl TI_flags(%ebp), %ecx # need_resched set ? testb $_TIF_NEED_RESCHED, %cl - jz restore_all + jz restore_nocheck testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ? - jz restore_all + jz restore_nocheck + DISABLE_INTERRUPTS(CLBR_ANY) + call preempt_schedule_irq jmp need_resched END(resume_kernel) @@ -484,12 +488,11 @@ work_pending: testl $(_TIF_NEED_RESCHED), %ecx jz work_notifysig work_resched: - call schedule + call __schedule LOCKDEP_SYS_EXIT DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt # setting need_resched or sigpending # between sampling and the iret - TRACE_IRQS_OFF movl TI_flags(%ebp), %ecx andl $_TIF_WORK_MASK, %ecx # is there any work to be done other # than syscall tracing? Index: linux-2.6.26/arch/x86/kernel/process_32.c =================================================================== --- linux-2.6.26.orig/arch/x86/kernel/process_32.c +++ linux-2.6.26/arch/x86/kernel/process_32.c @@ -189,10 +189,12 @@ void cpu_idle(void) idle(); start_critical_timings(); } + local_irq_disable(); tick_nohz_restart_sched_tick(); __preempt_enable_no_resched(); - schedule(); + __schedule(); preempt_disable(); + local_irq_enable(); } } patches/preempt-realtime-prevent-idle-boosting.patch0000664000076400007640000000341311043564025021751 0ustar tglxtglxSubject: Premmpt-RT: Preevent boosting of idle task Idle task boosting is a nono in general. There is one exception, when NOHZ is active: The idle task calls get_next_timer_interrupt() and holds the timer wheel base->lock on the CPU and another CPU wants to access the timer (probably to cancel it). We can safely ignore the boosting request, as the idle CPU runs this code with interrupts disabled and will complete the lock protected section without being interrupted. So there is no real need to boost. Signed-off-by: Thomas Gleixner --- kernel/sched.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -4871,6 +4871,25 @@ void task_setprio(struct task_struct *p, BUG_ON(prio < 0 || prio > MAX_PRIO); rq = task_rq_lock(p, &flags); + + /* + * Idle task boosting is a nono in general. There is one + * exception, when NOHZ is active: + * + * The idle task calls get_next_timer_interrupt() and holds + * the timer wheel base->lock on the CPU and another CPU wants + * to access the timer (probably to cancel it). We can safely + * ignore the boosting request, as the idle CPU runs this code + * with interrupts disabled and will complete the lock + * protected section without being interrupted. So there is no + * real need to boost. + */ + if (unlikely(p == rq->idle)) { + WARN_ON(p != rq->curr); + WARN_ON(p->pi_blocked_on); + goto out_unlock; + } + update_rq_clock(rq); oldprio = p->prio; @@ -4899,6 +4918,7 @@ void task_setprio(struct task_struct *p, } // trace_special(prev_resched, _need_resched(), 0); +out_unlock: task_rq_unlock(rq, &flags); } patches/schedule-tail-balance-disable-irqs.patch0000664000076400007640000000115311043564025020741 0ustar tglxtglx--- kernel/sched_rt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6.26/kernel/sched_rt.c =================================================================== --- linux-2.6.26.orig/kernel/sched_rt.c +++ linux-2.6.26/kernel/sched_rt.c @@ -1092,10 +1092,10 @@ static void post_schedule_rt(struct rq * * first via finish_lock_switch and then reaquire it here. */ if (unlikely(rq->rt.overloaded)) { - spin_lock_irq(&rq->lock); + spin_lock(&rq->lock); push_rt_tasks(rq); schedstat_inc(rq, rto_schedule_tail); - spin_unlock_irq(&rq->lock); + spin_unlock(&rq->lock); } } patches/preempt-realtime-sched-cpupri.patch0000664000076400007640000000067711043564025020130 0ustar tglxtglx--- kernel/sched_cpupri.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/kernel/sched_cpupri.h =================================================================== --- linux-2.6.26.orig/kernel/sched_cpupri.h +++ linux-2.6.26/kernel/sched_cpupri.h @@ -12,7 +12,7 @@ /* values 2-101 are RT priorities 0-99 */ struct cpupri_vec { - spinlock_t lock; + raw_spinlock_t lock; int count; cpumask_t mask; }; patches/preempt-realtime-core.patch0000664000076400007640000010600711043564025016464 0ustar tglxtglx--- include/linux/completion.h | 1 include/linux/hardirq.h | 36 ++++++------ include/linux/kernel.h | 15 ++++- include/linux/profile.h | 12 ++-- include/linux/radix-tree.h | 13 ++++ include/linux/smp.h | 11 +++ include/linux/smp_lock.h | 2 include/linux/workqueue.h | 3 + kernel/Kconfig.preempt | 129 ++++++++++++++++++++++++++++----------------- kernel/exit.c | 20 ++++-- kernel/fork.c | 26 ++++++++- kernel/futex.c | 10 ++- kernel/notifier.c | 4 - kernel/sched.c | 2 kernel/signal.c | 4 + kernel/softirq.c | 14 ++++ kernel/stop_machine.c | 4 - kernel/sys.c | 1 kernel/user.c | 4 - kernel/workqueue.c | 54 +++++++++++++++++- lib/Kconfig.debug | 4 + lib/Makefile | 3 - lib/kernel_lock.c | 19 +++++- lib/locking-selftest.c | 29 ++++++---- lib/radix-tree.c | 6 ++ 25 files changed, 317 insertions(+), 109 deletions(-) Index: linux-2.6.26/include/linux/completion.h =================================================================== --- linux-2.6.26.orig/include/linux/completion.h +++ linux-2.6.26/include/linux/completion.h @@ -49,6 +49,7 @@ extern unsigned long wait_for_completion unsigned long timeout); extern unsigned long wait_for_completion_interruptible_timeout( struct completion *x, unsigned long timeout); +extern unsigned int completion_done(struct completion *x); extern void complete(struct completion *); extern void complete_all(struct completion *); Index: linux-2.6.26/include/linux/hardirq.h =================================================================== --- linux-2.6.26.orig/include/linux/hardirq.h +++ linux-2.6.26/include/linux/hardirq.h @@ -41,23 +41,25 @@ # error HARDIRQ_BITS is too low! #endif #endif +#define PREEMPT_ACTIVE_BITS 1 -#define PREEMPT_SHIFT 0 -#define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS) -#define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS) - -#define __IRQ_MASK(x) ((1UL << (x))-1) - -#define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT) -#define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT) -#define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT) - -#define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT) -#define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT) -#define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT) +#define PREEMPT_SHIFT 0 +#define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS) +#define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS) +#define PREEMPT_ACTIVE_SHIFT (HARDIRQ_SHIFT + HARDIRQ_BITS) + +#define __IRQ_MASK(x) ((1UL << (x))-1) + +#define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT) +#define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT) +#define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT) + +#define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT) +#define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT) +#define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT) #if PREEMPT_ACTIVE < (1 << (HARDIRQ_SHIFT + HARDIRQ_BITS)) -#error PREEMPT_ACTIVE is too low! +# error PREEMPT_ACTIVE is too low! #endif #define hardirq_count() (preempt_count() & HARDIRQ_MASK) @@ -68,9 +70,9 @@ * Are we doing bottom half or hardware interrupt processing? * Are we in a softirq context? Interrupt context? */ -#define in_irq() (hardirq_count()) -#define in_softirq() (softirq_count()) -#define in_interrupt() (irq_count()) +#define in_irq() (hardirq_count() || (current->flags & PF_HARDIRQ)) +#define in_softirq() (softirq_count() || (current->flags & PF_SOFTIRQ)) +#define in_interrupt() (irq_count()) /* * Are we running in atomic context? WARNING: this macro cannot Index: linux-2.6.26/include/linux/kernel.h =================================================================== --- linux-2.6.26.orig/include/linux/kernel.h +++ linux-2.6.26/include/linux/kernel.h @@ -117,7 +117,7 @@ extern int _cond_resched(void); # define might_resched() do { } while (0) #endif -#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP +#if defined(CONFIG_DEBUG_SPINLOCK_SLEEP) || defined(CONFIG_DEBUG_PREEMPT) void __might_sleep(char *file, int line); # define might_sleep() \ do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) @@ -219,6 +219,18 @@ static inline bool printk_timed_ratelimi extern void __attribute__((format(printf, 1, 2))) early_printk(const char *fmt, ...); +#ifdef CONFIG_PREEMPT_RT +extern void zap_rt_locks(void); +#else +# define zap_rt_locks() do { } while (0) +#endif + +#ifdef CONFIG_PREEMPT_RT +extern void zap_rt_locks(void); +#else +# define zap_rt_locks() do { } while (0) +#endif + unsigned long int_sqrt(unsigned long); static inline void console_silent(void) @@ -246,6 +258,7 @@ extern int root_mountflags; /* Values used for system_state */ extern enum system_states { SYSTEM_BOOTING, + SYSTEM_BOOTING_SCHEDULER_OK, SYSTEM_RUNNING, SYSTEM_HALT, SYSTEM_POWER_OFF, Index: linux-2.6.26/include/linux/profile.h =================================================================== --- linux-2.6.26.orig/include/linux/profile.h +++ linux-2.6.26/include/linux/profile.h @@ -4,16 +4,18 @@ #include #include #include +#include #include #include extern int prof_on __read_mostly; -#define CPU_PROFILING 1 -#define SCHED_PROFILING 2 -#define SLEEP_PROFILING 3 -#define KVM_PROFILING 4 +#define CPU_PROFILING 1 +#define SCHED_PROFILING 2 +#define SLEEP_PROFILING 3 +#define KVM_PROFILING 4 +#define PREEMPT_PROFILING 5 struct proc_dir_entry; struct pt_regs; @@ -52,6 +54,8 @@ enum profile_type { PROFILE_MUNMAP }; +extern int prof_pid; + #ifdef CONFIG_PROFILING struct task_struct; Index: linux-2.6.26/include/linux/radix-tree.h =================================================================== --- linux-2.6.26.orig/include/linux/radix-tree.h +++ linux-2.6.26/include/linux/radix-tree.h @@ -161,7 +161,18 @@ radix_tree_gang_lookup(struct radix_tree unsigned long first_index, unsigned int max_items); unsigned long radix_tree_next_hole(struct radix_tree_root *root, unsigned long index, unsigned long max_scan); +/* + * On a mutex based kernel we can freely schedule within the radix code: + */ +#ifdef CONFIG_PREEMPT_RT +static inline int radix_tree_preload(gfp_t gfp_mask) +{ + return 0; +} +#else int radix_tree_preload(gfp_t gfp_mask); +#endif + void radix_tree_init(void); void *radix_tree_tag_set(struct radix_tree_root *root, unsigned long index, unsigned int tag); @@ -177,7 +188,9 @@ int radix_tree_tagged(struct radix_tree_ static inline void radix_tree_preload_end(void) { +#ifndef CONFIG_PREEMPT_RT preempt_enable(); +#endif } #endif /* _LINUX_RADIX_TREE_H */ Index: linux-2.6.26/include/linux/smp.h =================================================================== --- linux-2.6.26.orig/include/linux/smp.h +++ linux-2.6.26/include/linux/smp.h @@ -33,6 +33,16 @@ extern void smp_send_stop(void); */ extern void smp_send_reschedule(int cpu); +/* + * trigger a reschedule on all other CPUs: + */ +extern void smp_send_reschedule_allbutself(void); + +/* + * trigger a reschedule on all other CPUs: + */ +extern void smp_send_reschedule_allbutself(void); + /* * Prepare machine for booting other CPUs. @@ -100,6 +110,7 @@ static inline int up_smp_call_function(v 0; \ }) static inline void smp_send_reschedule(int cpu) { } +static inline void smp_send_reschedule_allbutself(void) { } #define num_booting_cpus() 1 #define smp_prepare_boot_cpu() do {} while (0) #define smp_call_function_single(cpuid, func, info, retry, wait) \ Index: linux-2.6.26/include/linux/smp_lock.h =================================================================== --- linux-2.6.26.orig/include/linux/smp_lock.h +++ linux-2.6.26/include/linux/smp_lock.h @@ -32,7 +32,7 @@ extern void __lockfunc unlock_kernel(voi #define lock_kernel() do { } while(0) #define unlock_kernel() do { } while(0) #define release_kernel_lock(task) do { } while(0) -#define reacquire_kernel_lock(task) 0 +#define reacquire_kernel_lock(task) do { } while(0) #define kernel_locked() 1 #endif /* CONFIG_LOCK_KERNEL */ Index: linux-2.6.26/include/linux/workqueue.h =================================================================== --- linux-2.6.26.orig/include/linux/workqueue.h +++ linux-2.6.26/include/linux/workqueue.h @@ -176,6 +176,9 @@ __create_workqueue_key(const char *name, #define create_freezeable_workqueue(name) __create_workqueue((name), 1, 1) #define create_singlethread_workqueue(name) __create_workqueue((name), 1, 0) +extern void set_workqueue_prio(struct workqueue_struct *wq, int policy, + int rt_priority, int nice); + extern void destroy_workqueue(struct workqueue_struct *wq); extern int queue_work(struct workqueue_struct *wq, struct work_struct *work); Index: linux-2.6.26/kernel/Kconfig.preempt =================================================================== --- linux-2.6.26.orig/kernel/Kconfig.preempt +++ linux-2.6.26/kernel/Kconfig.preempt @@ -1,14 +1,13 @@ - choice - prompt "Preemption Model" - default PREEMPT_NONE + prompt "Preemption Mode" + default PREEMPT_RT config PREEMPT_NONE bool "No Forced Preemption (Server)" help - This is the traditional Linux preemption model, geared towards + This is the traditional Linux preemption model geared towards throughput. It will still provide good latencies most of the - time, but there are no guarantees and occasional longer delays + time but there are no guarantees and occasional long delays are possible. Select this option if you are building a kernel for a server or @@ -21,7 +20,7 @@ config PREEMPT_VOLUNTARY help This option reduces the latency of the kernel by adding more "explicit preemption points" to the kernel code. These new - preemption points have been selected to reduce the maximum + preemption points have been selected to minimize the maximum latency of rescheduling, providing faster application reactions, at the cost of slightly lower throughput. @@ -33,25 +32,95 @@ config PREEMPT_VOLUNTARY Select this if you are building a kernel for a desktop system. -config PREEMPT +config PREEMPT_DESKTOP bool "Preemptible Kernel (Low-Latency Desktop)" help This option reduces the latency of the kernel by making - all kernel code (that is not executing in a critical section) + all kernel code that is not executing in a critical section preemptible. This allows reaction to interactive events by permitting a low priority process to be preempted involuntarily even if it is in kernel mode executing a system call and would - otherwise not be about to reach a natural preemption point. - This allows applications to run more 'smoothly' even when the - system is under load, at the cost of slightly lower throughput - and a slight runtime overhead to kernel code. + otherwise not about to reach a preemption point. This allows + applications to run more 'smoothly' even when the system is + under load, at the cost of slighly lower throughput and a + slight runtime overhead to kernel code. + + (According to profiles, when this mode is selected then even + during kernel-intense workloads the system is in an immediately + preemptible state more than 50% of the time.) Select this if you are building a kernel for a desktop or embedded system with latency requirements in the milliseconds range. +config PREEMPT_RT + bool "Complete Preemption (Real-Time)" + select PREEMPT_SOFTIRQS + select PREEMPT_HARDIRQS + select PREEMPT_RCU + select RT_MUTEXES + help + This option further reduces the scheduling latency of the + kernel by replacing almost every spinlock used by the kernel + with preemptible mutexes and thus making all but the most + critical kernel code involuntarily preemptible. The remaining + handful of lowlevel non-preemptible codepaths are short and + have a deterministic latency of a couple of tens of + microseconds (depending on the hardware). This also allows + applications to run more 'smoothly' even when the system is + under load, at the cost of lower throughput and runtime + overhead to kernel code. + + (According to profiles, when this mode is selected then even + during kernel-intense workloads the system is in an immediately + preemptible state more than 95% of the time.) + + Select this if you are building a kernel for a desktop, + embedded or real-time system with guaranteed latency + requirements of 100 usecs or lower. + endchoice +config PREEMPT + bool + default y + depends on PREEMPT_DESKTOP || PREEMPT_RT + +config PREEMPT_SOFTIRQS + bool "Thread Softirqs" + default n +# depends on PREEMPT + help + This option reduces the latency of the kernel by 'threading' + soft interrupts. This means that all softirqs will execute + in softirqd's context. While this helps latency, it can also + reduce performance. + + The threading of softirqs can also be controlled via + /proc/sys/kernel/softirq_preemption runtime flag and the + sofirq-preempt=0/1 boot-time option. + + Say N if you are unsure. + +config PREEMPT_HARDIRQS + bool "Thread Hardirqs" + default n + depends on !GENERIC_HARDIRQS_NO__DO_IRQ + select PREEMPT_SOFTIRQS + help + This option reduces the latency of the kernel by 'threading' + hardirqs. This means that all (or selected) hardirqs will run + in their own kernel thread context. While this helps latency, + this feature can also reduce performance. + + The threading of hardirqs can also be controlled via the + /proc/sys/kernel/hardirq_preemption runtime flag and the + hardirq-preempt=0/1 boot-time option. Per-irq threading can + be enabled/disable via the /proc/irq///threaded + runtime flags. + + Say N if you are unsure. + config PREEMPT_RCU bool "Preemptible RCU" depends on PREEMPT @@ -91,39 +160,3 @@ config RCU_TRACE Say Y here if you want to enable RCU tracing Say N if you are unsure. - -config PREEMPT_SOFTIRQS - bool "Thread Softirqs" - default n -# depends on PREEMPT - help - This option reduces the latency of the kernel by 'threading' - soft interrupts. This means that all softirqs will execute - in softirqd's context. While this helps latency, it can also - reduce performance. - - The threading of softirqs can also be controlled via - /proc/sys/kernel/softirq_preemption runtime flag and the - sofirq-preempt=0/1 boot-time option. - - Say N if you are unsure. - -config PREEMPT_HARDIRQS - bool "Thread Hardirqs" - default n - depends on !GENERIC_HARDIRQS_NO__DO_IRQ - select PREEMPT_SOFTIRQS - help - This option reduces the latency of the kernel by 'threading' - hardirqs. This means that all (or selected) hardirqs will run - in their own kernel thread context. While this helps latency, - this feature can also reduce performance. - - The threading of hardirqs can also be controlled via the - /proc/sys/kernel/hardirq_preemption runtime flag and the - hardirq-preempt=0/1 boot-time option. Per-irq threading can - be enabled/disable via the /proc/irq///threaded - runtime flags. - - Say N if you are unsure. - Index: linux-2.6.26/kernel/exit.c =================================================================== --- linux-2.6.26.orig/kernel/exit.c +++ linux-2.6.26/kernel/exit.c @@ -67,7 +67,9 @@ static void __unhash_process(struct task detach_pid(p, PIDTYPE_SID); list_del_rcu(&p->tasks); + preempt_disable(); __get_cpu_var(process_counts)--; + preempt_enable(); } list_del_rcu(&p->thread_group); remove_parent(p); @@ -683,9 +685,11 @@ static void exit_mm(struct task_struct * task_lock(tsk); tsk->mm = NULL; up_read(&mm->mmap_sem); + preempt_disable(); // FIXME enter_lazy_tlb(mm, current); /* We don't want this task to be frozen prematurely */ clear_freeze_flag(tsk); + preempt_enable(); task_unlock(tsk); mm_update_next_owner(mm); mmput(mm); @@ -1090,15 +1094,18 @@ NORET_TYPE void do_exit(long code) if (tsk->splice_pipe) __free_pipe_info(tsk->splice_pipe); - preempt_disable(); +again: + local_irq_disable(); /* causes final put_task_struct in finish_task_switch(). */ tsk->state = TASK_DEAD; - schedule(); - BUG(); - /* Avoid "noreturn function does return". */ - for (;;) - cpu_relax(); /* For when BUG is null */ + __schedule(); + printk(KERN_ERR "BUG: dead task %s:%d back from the grave!\n", + current->comm, current->pid); + printk(KERN_ERR ".... flags: %08x, count: %d, state: %08lx\n", + current->flags, atomic_read(¤t->usage), current->state); + printk(KERN_ERR ".... trying again ...\n"); + goto again; } EXPORT_SYMBOL_GPL(do_exit); @@ -1546,6 +1553,7 @@ repeat: list_for_each_entry(p, &tsk->children, sibling) { int ret = eligible_child(type, pid, options, p); + BUG_ON(!atomic_read(&p->usage)); if (!ret) continue; Index: linux-2.6.26/kernel/fork.c =================================================================== --- linux-2.6.26.orig/kernel/fork.c +++ linux-2.6.26/kernel/fork.c @@ -130,10 +130,13 @@ void free_task(struct task_struct *tsk) } EXPORT_SYMBOL(free_task); -void __put_task_struct(struct task_struct *tsk) +#ifdef CONFIG_PREEMPT_RT +void __put_task_struct_cb(struct rcu_head *rhp) { + struct task_struct *tsk = container_of(rhp, struct task_struct, rcu); + + BUG_ON(atomic_read(&tsk->usage)); WARN_ON(!tsk->exit_state); - WARN_ON(atomic_read(&tsk->usage)); WARN_ON(tsk == current); security_task_free(tsk); @@ -145,6 +148,23 @@ void __put_task_struct(struct task_struc free_task(tsk); } +#else + +void __put_task_struct(struct task_struct *tsk) +{ + WARN_ON(!(tsk->exit_state & (EXIT_DEAD | EXIT_ZOMBIE))); + BUG_ON(atomic_read(&tsk->usage)); + WARN_ON(tsk == current); + + security_task_free(tsk); + free_uid(tsk->user); + put_group_info(tsk->group_info); + + if (!profile_handoff_task(tsk)) + free_task(tsk); +} +#endif + /* * macro override instead of weak attribute alias, to workaround * gcc 4.1.0 and 4.1.1 bugs with weak attribute and empty functions. @@ -1175,11 +1195,13 @@ static struct task_struct *copy_process( * to ensure it is on a valid CPU (and if not, just force it back to * parent's CPU). This avoids alot of nasty races. */ + preempt_disable(); p->cpus_allowed = current->cpus_allowed; p->rt.nr_cpus_allowed = current->rt.nr_cpus_allowed; if (unlikely(!cpu_isset(task_cpu(p), p->cpus_allowed) || !cpu_online(task_cpu(p)))) set_task_cpu(p, smp_processor_id()); + preempt_enable(); /* CLONE_PARENT re-uses the old parent */ if (clone_flags & (CLONE_PARENT|CLONE_THREAD)) Index: linux-2.6.26/kernel/futex.c =================================================================== --- linux-2.6.26.orig/kernel/futex.c +++ linux-2.6.26/kernel/futex.c @@ -951,7 +951,7 @@ static int futex_requeue(u32 __user *uad plist_del(&this->list, &hb1->chain); plist_add(&this->list, &hb2->chain); this->lock_ptr = &hb2->lock; -#ifdef CONFIG_DEBUG_PI_LIST +#if defined(CONFIG_DEBUG_PI_LIST) && !defined(CONFIG_PREEMPT_RT) this->list.plist.lock = &hb2->lock; #endif } @@ -1008,7 +1008,7 @@ static inline void queue_me(struct futex prio = min(current->normal_prio, MAX_RT_PRIO); plist_node_init(&q->list, prio); -#ifdef CONFIG_DEBUG_PI_LIST +#if defined(CONFIG_DEBUG_PI_LIST) && !defined(CONFIG_PREEMPT_RT) q->list.plist.lock = &hb->lock; #endif plist_add(&q->list, &hb->chain); @@ -1293,6 +1293,10 @@ static int futex_wait(u32 __user *uaddr, * q.lock_ptr != 0 is not safe, because of ordering against wakeup. */ if (likely(!plist_node_empty(&q.list))) { + unsigned long nosched_flag = current->flags & PF_NOSCHED; + + current->flags &= ~PF_NOSCHED; + if (!abs_time) schedule(); else { @@ -1321,6 +1325,8 @@ static int futex_wait(u32 __user *uaddr, destroy_hrtimer_on_stack(&t.timer); } + + current->flags |= nosched_flag; } __set_current_state(TASK_RUNNING); Index: linux-2.6.26/kernel/notifier.c =================================================================== --- linux-2.6.26.orig/kernel/notifier.c +++ linux-2.6.26/kernel/notifier.c @@ -71,7 +71,7 @@ static int notifier_chain_unregister(str * @returns: notifier_call_chain returns the value returned by the * last notifier function called. */ -static int __kprobes notifier_call_chain(struct notifier_block **nl, +static int __kprobes notrace notifier_call_chain(struct notifier_block **nl, unsigned long val, void *v, int nr_to_call, int *nr_calls) { @@ -209,7 +209,7 @@ int blocking_notifier_chain_register(str * not yet working and interrupts must remain disabled. At * such times we must not call down_write(). */ - if (unlikely(system_state == SYSTEM_BOOTING)) + if (unlikely(system_state < SYSTEM_RUNNING)) return notifier_chain_register(&nh->head, n); down_write(&nh->rwsem); Index: linux-2.6.26/kernel/sched.c =================================================================== --- linux-2.6.26.orig/kernel/sched.c +++ linux-2.6.26/kernel/sched.c @@ -868,7 +868,7 @@ static DEFINE_PER_CPU(unsigned long long * enough to synchronize slowly diverging time sources and thus * it's good enough for tracing: */ -static DEFINE_SPINLOCK(time_sync_lock); +static DEFINE_RAW_SPINLOCK(time_sync_lock); static unsigned long long prev_global_time; static unsigned long long __sync_cpu_clock(unsigned long long time, int cpu) Index: linux-2.6.26/kernel/signal.c =================================================================== --- linux-2.6.26.orig/kernel/signal.c +++ linux-2.6.26/kernel/signal.c @@ -807,7 +807,9 @@ static int send_signal(int sig, struct s struct sigpending *pending; struct sigqueue *q; +#ifdef CONFIG_SMP assert_spin_locked(&t->sighand->siglock); +#endif if (!prepare_signal(sig, t)) return 0; @@ -1562,6 +1564,7 @@ static void ptrace_stop(int exit_code, i if (!unlikely(killed) && may_ptrace_stop()) { do_notify_parent_cldstop(current, CLD_TRAPPED); read_unlock(&tasklist_lock); + current->flags &= ~PF_NOSCHED; schedule(); } else { /* @@ -1630,6 +1633,7 @@ finish_stop(int stop_count) } do { + current->flags &= ~PF_NOSCHED; schedule(); } while (try_to_freeze()); /* Index: linux-2.6.26/kernel/softirq.c =================================================================== --- linux-2.6.26.orig/kernel/softirq.c +++ linux-2.6.26/kernel/softirq.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -122,6 +123,8 @@ static void trigger_softirqs(void) } } +#ifndef CONFIG_PREEMPT_RT + /* * This one is for softirq.c-internal use, * where hardirqs are disabled legitimately: @@ -239,6 +242,8 @@ void local_bh_enable_ip(unsigned long ip } EXPORT_SYMBOL(local_bh_enable_ip); +#endif + /* * We restart softirq processing MAX_SOFTIRQ_RESTART times, * and we fall back to softirqd after that. @@ -624,7 +629,7 @@ void tasklet_kill(struct tasklet_struct while (test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) { do - yield(); + msleep(1); while (test_bit(TASKLET_STATE_SCHED, &t->state)); } tasklet_unlock_wait(t); @@ -903,6 +908,11 @@ int softirq_preemption = 1; EXPORT_SYMBOL(softirq_preemption); +/* + * Real-Time Preemption depends on softirq threading: + */ +#ifndef CONFIG_PREEMPT_RT + static int __init softirq_preempt_setup (char *str) { if (!strncmp(str, "off", 3)) @@ -916,7 +926,7 @@ static int __init softirq_preempt_setup } __setup("softirq-preempt=", softirq_preempt_setup); - +#endif #endif #ifdef CONFIG_SMP Index: linux-2.6.26/kernel/stop_machine.c =================================================================== --- linux-2.6.26.orig/kernel/stop_machine.c +++ linux-2.6.26/kernel/stop_machine.c @@ -61,7 +61,7 @@ static int stopmachine(void *cpu) /* Yield in first stage: migration threads need to * help our sisters onto their CPUs. */ if (!prepared && !irqs_disabled) - yield(); + __yield(); cpu_relax(); } @@ -106,7 +106,7 @@ static int stop_machine(void) /* Wait for them all to come to life. */ while (atomic_read(&stopmachine_thread_ack) != stopmachine_num_threads) { - yield(); + __yield(); cpu_relax(); } Index: linux-2.6.26/kernel/sys.c =================================================================== --- linux-2.6.26.orig/kernel/sys.c +++ linux-2.6.26/kernel/sys.c @@ -36,6 +36,7 @@ #include #include +#include #include #include Index: linux-2.6.26/kernel/user.c =================================================================== --- linux-2.6.26.orig/kernel/user.c +++ linux-2.6.26/kernel/user.c @@ -377,11 +377,11 @@ void free_uid(struct user_struct *up) if (!up) return; - local_irq_save(flags); + local_irq_save_nort(flags); if (atomic_dec_and_lock(&up->__count, &uidhash_lock)) free_user(up, flags); else - local_irq_restore(flags); + local_irq_restore_nort(flags); } struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid) Index: linux-2.6.26/kernel/workqueue.c =================================================================== --- linux-2.6.26.orig/kernel/workqueue.c +++ linux-2.6.26/kernel/workqueue.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include #include @@ -34,6 +35,8 @@ #include #include +#include + /* * The per-CPU workqueue (if single thread, we always use the first * possible cpu). @@ -160,15 +163,16 @@ static void __queue_work(struct cpu_work * * We queue the work to the CPU on which it was submitted, but if the CPU dies * it can be processed by another CPU. + * + * Especially no such guarantee on PREEMPT_RT. */ int queue_work(struct workqueue_struct *wq, struct work_struct *work) { - int ret = 0; + int ret = 0, cpu = raw_smp_processor_id(); if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) { BUG_ON(!list_empty(&work->entry)); - __queue_work(wq_per_cpu(wq, get_cpu()), work); - put_cpu(); + __queue_work(wq_per_cpu(wq, cpu), work); ret = 1; } return ret; @@ -797,6 +801,49 @@ static void cleanup_workqueue_thread(str cwq->thread = NULL; } +void set_workqueue_thread_prio(struct workqueue_struct *wq, int cpu, + int policy, int rt_priority, int nice) +{ + struct sched_param param = { .sched_priority = rt_priority }; + struct cpu_workqueue_struct *cwq; + mm_segment_t oldfs = get_fs(); + struct task_struct *p; + unsigned long flags; + int ret; + + cwq = per_cpu_ptr(wq->cpu_wq, cpu); + spin_lock_irqsave(&cwq->lock, flags); + p = cwq->thread; + spin_unlock_irqrestore(&cwq->lock, flags); + + set_user_nice(p, nice); + + set_fs(KERNEL_DS); + ret = sys_sched_setscheduler(p->pid, policy, ¶m); + set_fs(oldfs); + + WARN_ON(ret); +} + +void set_workqueue_prio(struct workqueue_struct *wq, int policy, + int rt_priority, int nice) +{ + int cpu; + + /* We don't need the distraction of CPUs appearing and vanishing. */ + get_online_cpus(); + spin_lock(&workqueue_lock); + if (is_single_threaded(wq)) + set_workqueue_thread_prio(wq, 0, policy, rt_priority, nice); + else { + for_each_online_cpu(cpu) + set_workqueue_thread_prio(wq, cpu, policy, + rt_priority, nice); + } + spin_unlock(&workqueue_lock); + put_online_cpus(); +} + /** * destroy_workqueue - safely terminate a workqueue * @wq: target workqueue @@ -877,4 +924,5 @@ void __init init_workqueues(void) hotcpu_notifier(workqueue_cpu_callback, 0); keventd_wq = create_workqueue("events"); BUG_ON(!keventd_wq); + set_workqueue_prio(keventd_wq, SCHED_FIFO, 1, -20); } Index: linux-2.6.26/lib/Kconfig.debug =================================================================== --- linux-2.6.26.orig/lib/Kconfig.debug +++ linux-2.6.26/lib/Kconfig.debug @@ -279,6 +279,8 @@ config DEBUG_RT_MUTEXES help This allows rt mutex semantics violations and rt mutex related deadlocks (lockups) to be detected and reported automatically. + When realtime preemption is enabled this includes spinlocks, + rwlocks, mutexes and (rw)semaphores config DEBUG_PI_LIST bool @@ -302,7 +304,7 @@ config DEBUG_SPINLOCK config DEBUG_MUTEXES bool "Mutex debugging: basic checks" - depends on DEBUG_KERNEL + depends on DEBUG_KERNEL && !PREEMPT_RT help This feature allows mutex semantics violations to be detected and reported. Index: linux-2.6.26/lib/Makefile =================================================================== --- linux-2.6.26.orig/lib/Makefile +++ linux-2.6.26/lib/Makefile @@ -36,7 +36,8 @@ obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o -lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o +obj-$(CONFIG_PREEMPT_RT) += plist.o +obj-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o lib-$(CONFIG_GENERIC_FIND_FIRST_BIT) += find_next_bit.o lib-$(CONFIG_GENERIC_FIND_NEXT_BIT) += find_next_bit.o Index: linux-2.6.26/lib/kernel_lock.c =================================================================== --- linux-2.6.26.orig/lib/kernel_lock.c +++ linux-2.6.26/lib/kernel_lock.c @@ -35,22 +35,25 @@ DECLARE_MUTEX(kernel_sem); * about recursion, both due to the down() and due to the enabling of * preemption. schedule() will re-check the preemption flag after * reacquiring the semaphore. + * + * Called with interrupts disabled. */ int __lockfunc __reacquire_kernel_lock(void) { struct task_struct *task = current; int saved_lock_depth = task->lock_depth; + local_irq_enable(); BUG_ON(saved_lock_depth < 0); task->lock_depth = -1; - __preempt_enable_no_resched(); down(&kernel_sem); - preempt_disable(); task->lock_depth = saved_lock_depth; + local_irq_disable(); + return 0; } @@ -67,11 +70,15 @@ void __lockfunc lock_kernel(void) struct task_struct *task = current; int depth = task->lock_depth + 1; - if (likely(!depth)) + if (likely(!depth)) { /* * No recursion worries - we set up lock_depth _after_ */ down(&kernel_sem); +#ifdef CONFIG_DEBUG_RT_MUTEXES + current->last_kernel_lock = __builtin_return_address(0); +#endif + } task->lock_depth = depth; } @@ -82,8 +89,12 @@ void __lockfunc unlock_kernel(void) BUG_ON(task->lock_depth < 0); - if (likely(--task->lock_depth < 0)) + if (likely(--task->lock_depth == -1)) { +#ifdef CONFIG_DEBUG_RT_MUTEXES + current->last_kernel_lock = NULL; +#endif up(&kernel_sem); + } } EXPORT_SYMBOL(lock_kernel); Index: linux-2.6.26/lib/locking-selftest.c =================================================================== --- linux-2.6.26.orig/lib/locking-selftest.c +++ linux-2.6.26/lib/locking-selftest.c @@ -158,7 +158,7 @@ static void init_shared_classes(void) local_bh_disable(); \ local_irq_disable(); \ trace_softirq_enter(); \ - WARN_ON(!in_softirq()); + /* FIXME: preemptible softirqs. WARN_ON(!in_softirq()); */ #define SOFTIRQ_EXIT() \ trace_softirq_exit(); \ @@ -550,6 +550,11 @@ GENERATE_TESTCASE(init_held_rsem) #undef E /* + * FIXME: turns these into raw-spinlock tests on -rt + */ +#ifndef CONFIG_PREEMPT_RT + +/* * locking an irq-safe lock with irqs enabled: */ #define E1() \ @@ -890,6 +895,8 @@ GENERATE_PERMUTATIONS_3_EVENTS(irq_read_ #include "locking-selftest-softirq.h" // GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft) +#endif /* !CONFIG_PREEMPT_RT */ + #ifdef CONFIG_DEBUG_LOCK_ALLOC # define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map) # define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map) @@ -1004,7 +1011,7 @@ static inline void print_testname(const #define DO_TESTCASE_1(desc, name, nr) \ print_testname(desc"/"#nr); \ - dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ + dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ printk("\n"); #define DO_TESTCASE_1B(desc, name, nr) \ @@ -1012,17 +1019,17 @@ static inline void print_testname(const dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \ printk("\n"); -#define DO_TESTCASE_3(desc, name, nr) \ - print_testname(desc"/"#nr); \ - dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \ - dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ +#define DO_TESTCASE_3(desc, name, nr) \ + print_testname(desc"/"#nr); \ + dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \ + dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ printk("\n"); -#define DO_TESTCASE_3RW(desc, name, nr) \ - print_testname(desc"/"#nr); \ +#define DO_TESTCASE_3RW(desc, name, nr) \ + print_testname(desc"/"#nr); \ dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\ - dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ + dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ printk("\n"); @@ -1053,7 +1060,7 @@ static inline void print_testname(const print_testname(desc); \ dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ - dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ + dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ @@ -1185,6 +1192,7 @@ void locking_selftest(void) /* * irq-context testcases: */ +#ifndef CONFIG_PREEMPT_RT DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1); DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A); DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B); @@ -1194,6 +1202,7 @@ void locking_selftest(void) DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion); // DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2); +#endif if (unexpected_testcase_failures) { printk("-----------------------------------------------------------------\n"); Index: linux-2.6.26/lib/radix-tree.c =================================================================== --- linux-2.6.26.orig/lib/radix-tree.c +++ linux-2.6.26/lib/radix-tree.c @@ -157,12 +157,14 @@ radix_tree_node_alloc(struct radix_tree_ * succeed in getting a node here (and never reach * kmem_cache_alloc) */ + rtp = &get_cpu_var(radix_tree_preloads); rtp = &__get_cpu_var(radix_tree_preloads); if (rtp->nr) { ret = rtp->nodes[rtp->nr - 1]; rtp->nodes[rtp->nr - 1] = NULL; rtp->nr--; } + put_cpu_var(radix_tree_preloads); } if (ret == NULL) ret = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask); @@ -195,6 +197,8 @@ radix_tree_node_free(struct radix_tree_n call_rcu(&node->rcu_head, radix_tree_node_rcu_free); } +#ifndef CONFIG_PREEMPT_RT + /* * Load up this CPU's radix_tree_node buffer with sufficient objects to * ensure that the addition of a single element in the tree cannot fail. On @@ -227,6 +231,8 @@ out: } EXPORT_SYMBOL(radix_tree_preload); +#endif + /* * Return the maximum key which can be store into a * radix tree with height HEIGHT. patches/preempt-realtime-fs-block.patch0000664000076400007640000002560511043564025017240 0ustar tglxtglx--- block/blk-core.c | 6 ++-- fs/aio.c | 4 ++- fs/block_dev.c | 34 +++++++++++++++++++++------ fs/dcache.c | 5 ++-- fs/dnotify.c | 2 - fs/exec.c | 5 +++- fs/file.c | 5 ++-- fs/pipe.c | 12 +++++++++ fs/proc/proc_misc.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++ fs/proc/task_mmu.c | 4 ++- fs/xfs/linux-2.6/mrlock.h | 2 - fs/xfs/xfs_mount.h | 2 - include/linux/genhd.h | 9 +++++-- 13 files changed, 123 insertions(+), 23 deletions(-) Index: linux-2.6.26/block/blk-core.c =================================================================== --- linux-2.6.26.orig/block/blk-core.c +++ linux-2.6.26/block/blk-core.c @@ -192,7 +192,7 @@ EXPORT_SYMBOL(blk_dump_rq_flags); */ void blk_plug_device(struct request_queue *q) { - WARN_ON(!irqs_disabled()); + WARN_ON_NONRT(!irqs_disabled()); /* * don't plug a stopped queue, it must be paired with blk_start_queue() @@ -215,7 +215,7 @@ EXPORT_SYMBOL(blk_plug_device); */ int blk_remove_plug(struct request_queue *q) { - WARN_ON(!irqs_disabled()); + WARN_ON_NONRT(!irqs_disabled()); if (!test_bit(QUEUE_FLAG_PLUGGED, &q->queue_flags)) return 0; @@ -316,7 +316,7 @@ EXPORT_SYMBOL(blk_unplug); **/ void blk_start_queue(struct request_queue *q) { - WARN_ON(!irqs_disabled()); + WARN_ON_NONRT(!irqs_disabled()); queue_flag_clear(QUEUE_FLAG_STOPPED, q); Index: linux-2.6.26/fs/aio.c =================================================================== --- linux-2.6.26.orig/fs/aio.c +++ linux-2.6.26/fs/aio.c @@ -589,9 +589,11 @@ static void use_mm(struct mm_struct *mm) tsk->flags |= PF_BORROWED_MM; active_mm = tsk->active_mm; atomic_inc(&mm->mm_count); + local_irq_disable(); // FIXME + switch_mm(active_mm, mm, tsk); tsk->mm = mm; tsk->active_mm = mm; - switch_mm(active_mm, mm, tsk); + local_irq_enable(); task_unlock(tsk); mmdrop(active_mm); Index: linux-2.6.26/fs/block_dev.c =================================================================== --- linux-2.6.26.orig/fs/block_dev.c +++ linux-2.6.26/fs/block_dev.c @@ -1043,14 +1043,32 @@ static int __blkdev_get(struct block_dev * For now, block device ->open() routine must _not_ * examine anything in 'inode' argument except ->i_rdev. */ - struct file fake_file = {}; - struct dentry fake_dentry = {}; - fake_file.f_mode = mode; - fake_file.f_flags = flags; - fake_file.f_path.dentry = &fake_dentry; - fake_dentry.d_inode = bdev->bd_inode; - - return do_open(bdev, &fake_file, for_part); + struct file *fake_file; + struct dentry *fake_dentry; + int err = -ENOMEM; + + fake_file = kmalloc(sizeof(*fake_file), GFP_KERNEL); + if (!fake_file) + goto out; + memset(fake_file, 0, sizeof(*fake_file)); + + fake_dentry = kmalloc(sizeof(*fake_dentry), GFP_KERNEL); + if (!fake_dentry) + goto out_free_file; + memset(fake_dentry, 0, sizeof(*fake_dentry)); + + fake_file->f_mode = mode; + fake_file->f_flags = flags; + fake_file->f_path.dentry = fake_dentry; + fake_dentry->d_inode = bdev->bd_inode; + + err = do_open(bdev, fake_file, for_part); + + kfree(fake_dentry); +out_free_file: + kfree(fake_file); +out: + return err; } int blkdev_get(struct block_device *bdev, mode_t mode, unsigned flags) Index: linux-2.6.26/fs/dcache.c =================================================================== --- linux-2.6.26.orig/fs/dcache.c +++ linux-2.6.26/fs/dcache.c @@ -696,8 +696,9 @@ void shrink_dcache_for_umount(struct sup { struct dentry *dentry; - if (down_read_trylock(&sb->s_umount)) - BUG(); +// -rt: this might succeed there ... +// if (down_read_trylock(&sb->s_umount)) +// BUG(); dentry = sb->s_root; sb->s_root = NULL; Index: linux-2.6.26/fs/dnotify.c =================================================================== --- linux-2.6.26.orig/fs/dnotify.c +++ linux-2.6.26/fs/dnotify.c @@ -173,7 +173,7 @@ void dnotify_parent(struct dentry *dentr spin_lock(&dentry->d_lock); parent = dentry->d_parent; - if (parent->d_inode->i_dnotify_mask & event) { + if (unlikely(parent->d_inode->i_dnotify_mask & event)) { dget(parent); spin_unlock(&dentry->d_lock); __inode_dir_notify(parent->d_inode, event); Index: linux-2.6.26/fs/exec.c =================================================================== --- linux-2.6.26.orig/fs/exec.c +++ linux-2.6.26/fs/exec.c @@ -48,6 +48,7 @@ #include #include #include +#include #include #include #include @@ -735,10 +736,12 @@ static int exec_mmap(struct mm_struct *m } } task_lock(tsk); + local_irq_disable(); active_mm = tsk->active_mm; + activate_mm(active_mm, mm); tsk->mm = mm; tsk->active_mm = mm; - activate_mm(active_mm, mm); + local_irq_enable(); task_unlock(tsk); mm_update_next_owner(old_mm); arch_pick_mmap_layout(mm); Index: linux-2.6.26/fs/file.c =================================================================== --- linux-2.6.26.orig/fs/file.c +++ linux-2.6.26/fs/file.c @@ -101,14 +101,15 @@ void free_fdtable_rcu(struct rcu_head *r kfree(fdt->open_fds); kfree(fdt); } else { - fddef = &get_cpu_var(fdtable_defer_list); + + fddef = &per_cpu(fdtable_defer_list, raw_smp_processor_id()); + spin_lock(&fddef->lock); fdt->next = fddef->next; fddef->next = fdt; /* vmallocs are handled from the workqueue context */ schedule_work(&fddef->wq); spin_unlock(&fddef->lock); - put_cpu_var(fdtable_defer_list); } } Index: linux-2.6.26/fs/pipe.c =================================================================== --- linux-2.6.26.orig/fs/pipe.c +++ linux-2.6.26/fs/pipe.c @@ -386,8 +386,14 @@ redo: wake_up_interruptible_sync(&pipe->wait); kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT); } + /* + * Hack: we turn off atime updates for -RT kernels. + * Who uses them on pipes anyway? + */ +#ifndef CONFIG_PREEMPT_RT if (ret > 0) file_accessed(filp); +#endif return ret; } @@ -559,8 +565,14 @@ out: wake_up_interruptible_sync(&pipe->wait); kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); } + /* + * Hack: we turn off atime updates for -RT kernels. + * Who uses them on pipes anyway? + */ +#ifndef CONFIG_PREEMPT_RT if (ret > 0) file_update_time(filp); +#endif return ret; } Index: linux-2.6.26/fs/proc/proc_misc.c =================================================================== --- linux-2.6.26.orig/fs/proc/proc_misc.c +++ linux-2.6.26/fs/proc/proc_misc.c @@ -103,6 +103,27 @@ static int loadavg_read_proc(char *page, return proc_calc_metrics(page, start, off, count, eof, len); } +#ifdef CONFIG_PREEMPT_RT +static int loadavg_rt_read_proc(char *page, char **start, off_t off, + int count, int *eof, void *data) +{ + extern unsigned long avenrun_rt[]; + extern unsigned long rt_nr_running(void); + int a, b, c; + int len; + + a = avenrun_rt[0] + (FIXED_1/200); + b = avenrun_rt[1] + (FIXED_1/200); + c = avenrun_rt[2] + (FIXED_1/200); + len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n", + LOAD_INT(a), LOAD_FRAC(a), + LOAD_INT(b), LOAD_FRAC(b), + LOAD_INT(c), LOAD_FRAC(c), + rt_nr_running(), nr_threads, current->nsproxy->pid_ns->last_pid); + return proc_calc_metrics(page, start, off, count, eof, len); +} +#endif + static int uptime_read_proc(char *page, char **start, off_t off, int count, int *eof, void *data) { @@ -576,6 +597,38 @@ static int show_stat(struct seq_file *p, nr_iowait()); kfree(per_irq_sum); +#ifdef CONFIG_PREEMPT_RT + { + unsigned long nr_uninterruptible_cpu(int cpu); + extern int pi_initialized; + unsigned long rt_nr_running(void); + unsigned long rt_nr_running_cpu(int cpu); + unsigned long rt_nr_uninterruptible(void); + unsigned long rt_nr_uninterruptible_cpu(int cpu); + + int i; + + seq_printf(p, "pi_init: %d\n", pi_initialized); + seq_printf(p, "nr_running(): %ld\n", + nr_running()); + seq_printf(p, "nr_uninterruptible(): %ld\n", + nr_uninterruptible()); + for_each_online_cpu(i) + seq_printf(p, "nr_uninterruptible(%d): %ld\n", + i, nr_uninterruptible_cpu(i)); + seq_printf(p, "rt_nr_running(): %ld\n", + rt_nr_running()); + for_each_online_cpu(i) + seq_printf(p, "rt_nr_running(%d): %ld\n", + i, rt_nr_running_cpu(i)); + seq_printf(p, "nr_rt_uninterruptible(): %ld\n", + rt_nr_uninterruptible()); + for_each_online_cpu(i) + seq_printf(p, "nr_rt_uninterruptible(%d): %ld\n", + i, rt_nr_uninterruptible_cpu(i)); + } +#endif + return 0; } @@ -847,6 +900,9 @@ void __init proc_misc_init(void) int (*read_proc)(char*,char**,off_t,int,int*,void*); } *p, simple_ones[] = { {"loadavg", loadavg_read_proc}, +#ifdef CONFIG_PREEMPT_RT + {"loadavgrt", loadavg_rt_read_proc}, +#endif {"uptime", uptime_read_proc}, {"meminfo", meminfo_read_proc}, {"version", version_read_proc}, Index: linux-2.6.26/fs/proc/task_mmu.c =================================================================== --- linux-2.6.26.orig/fs/proc/task_mmu.c +++ linux-2.6.26/fs/proc/task_mmu.c @@ -137,8 +137,10 @@ static void *m_start(struct seq_file *m, vma = NULL; if ((unsigned long)l < mm->map_count) { vma = mm->mmap; - while (l-- && vma) + while (l-- && vma) { vma = vma->vm_next; + cond_resched(); + } goto out; } Index: linux-2.6.26/fs/xfs/linux-2.6/mrlock.h =================================================================== --- linux-2.6.26.orig/fs/xfs/linux-2.6/mrlock.h +++ linux-2.6.26/fs/xfs/linux-2.6/mrlock.h @@ -21,7 +21,7 @@ #include typedef struct { - struct rw_semaphore mr_lock; + struct compat_rw_semaphore mr_lock; #ifdef DEBUG int mr_writer; #endif Index: linux-2.6.26/fs/xfs/xfs_mount.h =================================================================== --- linux-2.6.26.orig/fs/xfs/xfs_mount.h +++ linux-2.6.26/fs/xfs/xfs_mount.h @@ -283,7 +283,7 @@ typedef struct xfs_mount { uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */ uint m_in_maxlevels; /* XFS_IN_MAXLEVELS */ struct xfs_perag *m_perag; /* per-ag accounting info */ - struct rw_semaphore m_peraglock; /* lock for m_perag (pointer) */ + struct compat_rw_semaphore m_peraglock; /* lock for m_perag (pointer) */ struct mutex m_growlock; /* growfs mutex */ int m_fixedfsid[2]; /* unchanged for life of FS */ uint m_dmevmask; /* DMI events for this FS */ Index: linux-2.6.26/include/linux/genhd.h =================================================================== --- linux-2.6.26.orig/include/linux/genhd.h +++ linux-2.6.26/include/linux/genhd.h @@ -164,8 +164,13 @@ static inline struct hd_struct *get_part } #ifdef CONFIG_SMP -#define __disk_stat_add(gendiskp, field, addnd) \ - (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd) +#define __disk_stat_add(gendiskp, field, addnd) \ +do { \ + preempt_disable(); \ + (per_cpu_ptr(gendiskp->dkstats, \ + smp_processor_id())->field += addnd); \ + preempt_enable(); \ +} while (0) #define disk_stat_read(gendiskp, field) \ ({ \ patches/preempt-realtime-acpi.patch0000664000076400007640000001164711043564024016454 0ustar tglxtglx--- drivers/acpi/ec.c | 12 ++++++++++++ drivers/acpi/hardware/hwregs.c | 12 ++++++------ drivers/acpi/processor_idle.c | 2 +- drivers/acpi/utilities/utmutex.c | 2 +- include/acpi/acglobal.h | 7 ++++++- include/acpi/acpiosxf.h | 2 +- 6 files changed, 27 insertions(+), 10 deletions(-) Index: linux-2.6.26/drivers/acpi/ec.c =================================================================== --- linux-2.6.26.orig/drivers/acpi/ec.c +++ linux-2.6.26/drivers/acpi/ec.c @@ -499,7 +499,19 @@ static u32 acpi_ec_gpe_handler(void *dat } clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) +#if 0 wake_up(&ec->wait); +#else + // hack ... + if (waitqueue_active(&ec->wait)) { + struct task_struct *task; + + task = list_entry(ec->wait.task_list.next, + wait_queue_t, task_list)->private; + if (task) + wake_up_process(task); + } +#endif if (state & ACPI_EC_FLAG_SCI) { if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) Index: linux-2.6.26/drivers/acpi/hardware/hwregs.c =================================================================== --- linux-2.6.26.orig/drivers/acpi/hardware/hwregs.c +++ linux-2.6.26/drivers/acpi/hardware/hwregs.c @@ -73,7 +73,7 @@ acpi_status acpi_hw_clear_acpi_status(vo ACPI_BITMASK_ALL_FIXED_STATUS, (u16) acpi_gbl_FADT.xpm1a_event_block.address)); - lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); + spin_lock_irqsave(acpi_gbl_hardware_lock, lock_flags); status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, ACPI_BITMASK_ALL_FIXED_STATUS); @@ -97,7 +97,7 @@ acpi_status acpi_hw_clear_acpi_status(vo status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block); unlock_and_exit: - acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); + spin_unlock_irqrestore(acpi_gbl_hardware_lock, lock_flags); return_ACPI_STATUS(status); } @@ -300,9 +300,9 @@ acpi_status acpi_get_register(u32 regist { acpi_status status; acpi_cpu_flags flags; - flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); + spin_lock_irqsave(acpi_gbl_hardware_lock, flags); status = acpi_get_register_unlocked(register_id, return_value); - acpi_os_release_lock(acpi_gbl_hardware_lock, flags); + spin_unlock_irqrestore(acpi_gbl_hardware_lock, flags); return status; } @@ -339,7 +339,7 @@ acpi_status acpi_set_register(u32 regist return_ACPI_STATUS(AE_BAD_PARAMETER); } - lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); + spin_lock_irqsave(acpi_gbl_hardware_lock, lock_flags); /* Always do a register read first so we can insert the new bits */ @@ -443,7 +443,7 @@ acpi_status acpi_set_register(u32 regist unlock_and_exit: - acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); + spin_unlock_irqrestore(acpi_gbl_hardware_lock, lock_flags); /* Normalize the value that was read */ Index: linux-2.6.26/drivers/acpi/processor_idle.c =================================================================== --- linux-2.6.26.orig/drivers/acpi/processor_idle.c +++ linux-2.6.26/drivers/acpi/processor_idle.c @@ -1532,7 +1532,7 @@ static int acpi_idle_enter_simple(struct } static int c3_cpu_count; -static DEFINE_SPINLOCK(c3_lock); +static DEFINE_RAW_SPINLOCK(c3_lock); /** * acpi_idle_enter_bm - enters C3 with proper BM handling Index: linux-2.6.26/drivers/acpi/utilities/utmutex.c =================================================================== --- linux-2.6.26.orig/drivers/acpi/utilities/utmutex.c +++ linux-2.6.26/drivers/acpi/utilities/utmutex.c @@ -116,7 +116,7 @@ void acpi_ut_mutex_terminate(void) /* Delete the spinlocks */ acpi_os_delete_lock(acpi_gbl_gpe_lock); - acpi_os_delete_lock(acpi_gbl_hardware_lock); +// acpi_os_delete_lock(acpi_gbl_hardware_lock); return_VOID; } Index: linux-2.6.26/include/acpi/acglobal.h =================================================================== --- linux-2.6.26.orig/include/acpi/acglobal.h +++ linux-2.6.26/include/acpi/acglobal.h @@ -184,7 +184,12 @@ ACPI_EXTERN u8 acpi_gbl_global_lock_pres * interrupt level */ ACPI_EXTERN spinlock_t _acpi_gbl_gpe_lock; /* For GPE data structs and registers */ -ACPI_EXTERN spinlock_t _acpi_gbl_hardware_lock; /* For ACPI H/W except GPE registers */ + +/* + * Need to be raw because it might be used in acpi_processor_idle(): + */ +ACPI_EXTERN raw_spinlock_t _acpi_gbl_hardware_lock; /* For ACPI H/W except GPE registers */ + #define acpi_gbl_gpe_lock &_acpi_gbl_gpe_lock #define acpi_gbl_hardware_lock &_acpi_gbl_hardware_lock Index: linux-2.6.26/include/acpi/acpiosxf.h =================================================================== --- linux-2.6.26.orig/include/acpi/acpiosxf.h +++ linux-2.6.26/include/acpi/acpiosxf.h @@ -61,7 +61,7 @@ typedef enum { OSL_EC_BURST_HANDLER } acpi_execute_type; -#define ACPI_NO_UNIT_LIMIT ((u32) -1) +#define ACPI_NO_UNIT_LIMIT (INT_MAX/2) #define ACPI_MUTEX_SEM 1 /* Functions for acpi_os_signal */ patches/preempt-realtime-ipc.patch0000664000076400007640000000571211043564024016307 0ustar tglxtglx--- ipc/mqueue.c | 5 +++++ ipc/msg.c | 25 +++++++++++++++++++------ ipc/sem.c | 6 ++++++ 3 files changed, 30 insertions(+), 6 deletions(-) Index: linux-2.6.26/ipc/mqueue.c =================================================================== --- linux-2.6.26.orig/ipc/mqueue.c +++ linux-2.6.26/ipc/mqueue.c @@ -792,12 +792,17 @@ static inline void pipelined_send(struct struct msg_msg *message, struct ext_wait_queue *receiver) { + /* + * Keep them in one critical section for PREEMPT_RT: + */ + preempt_disable(); receiver->msg = message; list_del(&receiver->list); receiver->state = STATE_PENDING; wake_up_process(receiver->task); smp_wmb(); receiver->state = STATE_READY; + preempt_enable(); } /* pipelined_receive() - if there is task waiting in sys_mq_timedsend() Index: linux-2.6.26/ipc/msg.c =================================================================== --- linux-2.6.26.orig/ipc/msg.c +++ linux-2.6.26/ipc/msg.c @@ -259,12 +259,19 @@ static void expunge_all(struct msg_queue while (tmp != &msq->q_receivers) { struct msg_receiver *msr; + /* + * Make sure that the wakeup doesnt preempt + * this CPU prematurely. (on PREEMPT_RT) + */ + preempt_disable(); + msr = list_entry(tmp, struct msg_receiver, r_list); tmp = tmp->next; msr->r_msg = NULL; - wake_up_process(msr->r_tsk); - smp_mb(); + wake_up_process(msr->r_tsk); /* serializes */ msr->r_msg = ERR_PTR(res); + + preempt_enable(); } } @@ -611,22 +618,28 @@ static inline int pipelined_send(struct !security_msg_queue_msgrcv(msq, msg, msr->r_tsk, msr->r_msgtype, msr->r_mode)) { + /* + * Make sure that the wakeup doesnt preempt + * this CPU prematurely. (on PREEMPT_RT) + */ + preempt_disable(); + list_del(&msr->r_list); if (msr->r_maxsize < msg->m_ts) { msr->r_msg = NULL; - wake_up_process(msr->r_tsk); - smp_mb(); + wake_up_process(msr->r_tsk); /* serializes */ msr->r_msg = ERR_PTR(-E2BIG); } else { msr->r_msg = NULL; msq->q_lrpid = task_pid_vnr(msr->r_tsk); msq->q_rtime = get_seconds(); - wake_up_process(msr->r_tsk); - smp_mb(); + wake_up_process(msr->r_tsk); /* serializes */ msr->r_msg = msg; + preempt_enable(); return 1; } + preempt_enable(); } } return 0; Index: linux-2.6.26/ipc/sem.c =================================================================== --- linux-2.6.26.orig/ipc/sem.c +++ linux-2.6.26/ipc/sem.c @@ -447,6 +447,11 @@ static void update_queue (struct sem_arr if (error <= 0) { struct sem_queue *n; remove_from_queue(sma,q); + /* + * make sure that the wakeup doesnt preempt + * _this_ cpu prematurely. (on preempt_rt) + */ + preempt_disable(); q->status = IN_WAKEUP; /* * Continue scanning. The next operation @@ -469,6 +474,7 @@ static void update_queue (struct sem_arr */ smp_wmb(); q->status = error; + preempt_enable(); q = n; } else { q = q->next; patches/preempt-realtime-sound.patch0000664000076400007640000000141611043564024016661 0ustar tglxtglx--- sound/core/pcm_lib.c | 2 ++ 1 file changed, 2 insertions(+) Index: linux-2.6.26/sound/core/pcm_lib.c =================================================================== --- linux-2.6.26.orig/sound/core/pcm_lib.c +++ linux-2.6.26/sound/core/pcm_lib.c @@ -29,6 +29,7 @@ #include #include +#include /* * fill ring buffer with silence * runtime->silence_start: starting pointer to silence area @@ -129,6 +130,7 @@ static void xrun(struct snd_pcm_substrea snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); #ifdef CONFIG_SND_PCM_XRUN_DEBUG if (substream->pstr->xrun_debug) { + user_trace_stop(); snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n", substream->pcm->card->number, substream->pcm->device, patches/preempt-realtime-mm.patch0000664000076400007640000001652411043564024016150 0ustar tglxtglx--- include/linux/pagevec.h | 2 +- include/linux/vmstat.h | 10 ++++++++++ mm/bounce.c | 4 ++-- mm/memory.c | 11 +++++++++-- mm/mmap.c | 10 ++++++++-- mm/vmscan.c | 10 ++++++++-- mm/vmstat.c | 38 ++++++++++++++++++++++++++++++++------ 7 files changed, 70 insertions(+), 15 deletions(-) Index: linux-2.6.26/include/linux/pagevec.h =================================================================== --- linux-2.6.26.orig/include/linux/pagevec.h +++ linux-2.6.26/include/linux/pagevec.h @@ -9,7 +9,7 @@ #define _LINUX_PAGEVEC_H /* 14 pointers + two long's align the pagevec structure to a power of two */ -#define PAGEVEC_SIZE 14 +#define PAGEVEC_SIZE 8 struct page; struct address_space; Index: linux-2.6.26/include/linux/vmstat.h =================================================================== --- linux-2.6.26.orig/include/linux/vmstat.h +++ linux-2.6.26/include/linux/vmstat.h @@ -63,7 +63,12 @@ DECLARE_PER_CPU(struct vm_event_state, v static inline void __count_vm_event(enum vm_event_item item) { +#ifdef CONFIG_PREEMPT_RT + get_cpu_var(vm_event_states).event[item]++; + put_cpu(); +#else __get_cpu_var(vm_event_states).event[item]++; +#endif } static inline void count_vm_event(enum vm_event_item item) @@ -74,7 +79,12 @@ static inline void count_vm_event(enum v static inline void __count_vm_events(enum vm_event_item item, long delta) { +#ifdef CONFIG_PREEMPT_RT + get_cpu_var(vm_event_states).event[item] += delta; + put_cpu(); +#else __get_cpu_var(vm_event_states).event[item] += delta; +#endif } static inline void count_vm_events(enum vm_event_item item, long delta) Index: linux-2.6.26/mm/bounce.c =================================================================== --- linux-2.6.26.orig/mm/bounce.c +++ linux-2.6.26/mm/bounce.c @@ -48,11 +48,11 @@ static void bounce_copy_vec(struct bio_v unsigned long flags; unsigned char *vto; - local_irq_save(flags); + local_irq_save_nort(flags); vto = kmap_atomic(to->bv_page, KM_BOUNCE_READ); memcpy(vto + to->bv_offset, vfrom, to->bv_len); kunmap_atomic(vto, KM_BOUNCE_READ); - local_irq_restore(flags); + local_irq_restore_nort(flags); } #else /* CONFIG_HIGHMEM */ Index: linux-2.6.26/mm/memory.c =================================================================== --- linux-2.6.26.orig/mm/memory.c +++ linux-2.6.26/mm/memory.c @@ -288,7 +288,9 @@ void free_pgtables(struct mmu_gather **t if (!vma) /* Sometimes when exiting after an oops */ return; +#ifndef CONFIG_PREEMPT_RT if (vma->vm_next) +#endif tlb_finish_mmu(*tlb, tlb_start_addr(*tlb), tlb_end_addr(*tlb)); /* * Hide vma from rmap and vmtruncate before freeeing pgtables, @@ -299,7 +301,9 @@ void free_pgtables(struct mmu_gather **t unlink_file_vma(unlink); unlink = unlink->vm_next; } +#ifndef CONFIG_PREEMPT_RT if (vma->vm_next) +#endif *tlb = tlb_gather_mmu(vma->vm_mm, fullmm); #endif while (vma) { @@ -866,10 +870,13 @@ static unsigned long unmap_page_range(st return addr; } -#ifdef CONFIG_PREEMPT +#if defined(CONFIG_PREEMPT) && !defined(CONFIG_PREEMPT_RT) # define ZAP_BLOCK_SIZE (8 * PAGE_SIZE) #else -/* No preempt: go for improved straight-line efficiency */ +/* + * No preempt: go for improved straight-line efficiency + * on PREEMPT_RT this is not a critical latency-path. + */ # define ZAP_BLOCK_SIZE (1024 * PAGE_SIZE) #endif Index: linux-2.6.26/mm/mmap.c =================================================================== --- linux-2.6.26.orig/mm/mmap.c +++ linux-2.6.26/mm/mmap.c @@ -1931,10 +1931,16 @@ asmlinkage long sys_munmap(unsigned long static inline void verify_mm_writelocked(struct mm_struct *mm) { #ifdef CONFIG_DEBUG_VM - if (unlikely(down_read_trylock(&mm->mmap_sem))) { +# ifdef CONFIG_PREEMPT_RT + if (unlikely(!rt_rwsem_is_locked(&mm->mmap_sem))) { WARN_ON(1); - up_read(&mm->mmap_sem); } +# else + if (unlikely(down_read_trylock(&mm->mmap_sem))) { + WARN_ON(1); + up_read(&mm->mmap_sem); + } +# endif #endif } Index: linux-2.6.26/mm/vmscan.c =================================================================== --- linux-2.6.26.orig/mm/vmscan.c +++ linux-2.6.26/mm/vmscan.c @@ -23,6 +23,7 @@ #include #include #include +#include #include /* for try_to_release_page(), buffer_heads_over_limit */ #include @@ -872,7 +873,7 @@ static unsigned long shrink_inactive_lis } nr_reclaimed += nr_freed; - local_irq_disable(); + local_irq_disable_nort(); if (current_is_kswapd()) { __count_zone_vm_events(PGSCAN_KSWAPD, zone, nr_scan); __count_vm_events(KSWAPD_STEAL, nr_freed); @@ -904,9 +905,14 @@ static unsigned long shrink_inactive_lis } } } while (nr_scanned < max_scan); + /* + * Non-PREEMPT_RT relies on IRQs-off protecting the page_states + * per-CPU data. PREEMPT_RT has that data protected even in + * __mod_page_state(), so no need to keep IRQs disabled. + */ spin_unlock(&zone->lru_lock); done: - local_irq_enable(); + local_irq_enable_nort(); pagevec_release(&pvec); return nr_reclaimed; } Index: linux-2.6.26/mm/vmstat.c =================================================================== --- linux-2.6.26.orig/mm/vmstat.c +++ linux-2.6.26/mm/vmstat.c @@ -152,10 +152,14 @@ static void refresh_zone_stat_thresholds void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, int delta) { - struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); - s8 *p = pcp->vm_stat_diff + item; + struct per_cpu_pageset *pcp; + int cpu; long x; + s8 *p; + cpu = get_cpu(); + pcp = zone_pcp(zone, cpu); + p = pcp->vm_stat_diff + item; x = delta + *p; if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) { @@ -163,6 +167,7 @@ void __mod_zone_page_state(struct zone * x = 0; } *p = x; + put_cpu(); } EXPORT_SYMBOL(__mod_zone_page_state); @@ -205,9 +210,13 @@ EXPORT_SYMBOL(mod_zone_page_state); */ void __inc_zone_state(struct zone *zone, enum zone_stat_item item) { - struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); - s8 *p = pcp->vm_stat_diff + item; + struct per_cpu_pageset *pcp; + int cpu; + s8 *p; + cpu = get_cpu(); + pcp = zone_pcp(zone, cpu); + p = pcp->vm_stat_diff + item; (*p)++; if (unlikely(*p > pcp->stat_threshold)) { @@ -216,18 +225,34 @@ void __inc_zone_state(struct zone *zone, zone_page_state_add(*p + overstep, zone, item); *p = -overstep; } + put_cpu(); } void __inc_zone_page_state(struct page *page, enum zone_stat_item item) { +#ifdef CONFIG_PREEMPT_RT + unsigned long flags; + struct zone *zone; + + zone = page_zone(page); + local_irq_save(flags); + __inc_zone_state(zone, item); + local_irq_restore(flags); +#else __inc_zone_state(page_zone(page), item); +#endif } EXPORT_SYMBOL(__inc_zone_page_state); void __dec_zone_state(struct zone *zone, enum zone_stat_item item) { - struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); - s8 *p = pcp->vm_stat_diff + item; + struct per_cpu_pageset *pcp; + int cpu; + s8 *p; + + cpu = get_cpu(); + pcp = zone_pcp(zone, cpu); + p = pcp->vm_stat_diff + item; (*p)--; @@ -237,6 +262,7 @@ void __dec_zone_state(struct zone *zone, zone_page_state_add(*p - overstep, zone, item); *p = overstep; } + put_cpu(); } void __dec_zone_page_state(struct page *page, enum zone_stat_item item) patches/preempt-realtime-init-show-enabled-debugs.patch0000664000076400007640000001002711043564023022306 0ustar tglxtglx--- init/main.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) Index: linux-2.6.26/init/main.c =================================================================== --- linux-2.6.26.orig/init/main.c +++ linux-2.6.26/init/main.c @@ -463,6 +463,8 @@ static void noinline __init_refok rest_i { int pid; + system_state = SYSTEM_BOOTING_SCHEDULER_OK; + kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); numa_default_policy(); pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); @@ -688,6 +690,9 @@ asmlinkage void __init start_kernel(void acpi_early_init(); /* before LAPIC and SMP init */ +#ifdef CONFIG_PREEMPT_RT + WARN_ON(irqs_disabled()); +#endif /* Do the rest non-__init'ed, we're now alive */ rest_init(); } @@ -786,12 +791,14 @@ __setup("nosoftlockup", nosoftlockup_set static void __init do_pre_smp_initcalls(void) { extern int spawn_ksoftirqd(void); + extern int spawn_desched_task(void); migration_init(); posix_cpu_thread_init(); spawn_ksoftirqd(); if (!nosoftlockup) spawn_softlockup_task(); + spawn_desched_task(); } static void run_init_process(char *init_filename) @@ -824,6 +831,9 @@ static int noinline init_post(void) printk(KERN_WARNING "Failed to execute %s\n", ramdisk_execute_command); } +#ifdef CONFIG_PREEMPT_RT + WARN_ON(irqs_disabled()); +#endif /* * We try each of these until one succeeds. @@ -888,7 +898,51 @@ static int __init kernel_init(void * unu ramdisk_execute_command = NULL; prepare_namespace(); } +#ifdef CONFIG_PREEMPT_RT + WARN_ON(irqs_disabled()); +#endif +#define DEBUG_COUNT (defined(CONFIG_DEBUG_RT_MUTEXES) + defined(CONFIG_CRITICAL_PREEMPT_TIMING) + defined(CONFIG_CRITICAL_IRQSOFF_TIMING) + defined(CONFIG_FUNCTION_TRACE) + defined(CONFIG_DEBUG_SLAB) + defined(CONFIG_DEBUG_PAGEALLOC) + defined(CONFIG_LOCKDEP)) + +#if DEBUG_COUNT > 0 + printk(KERN_ERR "*****************************************************************************\n"); + printk(KERN_ERR "* *\n"); +#if DEBUG_COUNT == 1 + printk(KERN_ERR "* REMINDER, the following debugging option is turned on in your .config: *\n"); +#else + printk(KERN_ERR "* REMINDER, the following debugging options are turned on in your .config: *\n"); +#endif + printk(KERN_ERR "* *\n"); +#ifdef CONFIG_DEBUG_RT_MUTEXES + printk(KERN_ERR "* CONFIG_DEBUG_RT_MUTEXES *\n"); +#endif +#ifdef CONFIG_CRITICAL_PREEMPT_TIMING + printk(KERN_ERR "* CONFIG_CRITICAL_PREEMPT_TIMING *\n"); +#endif +#ifdef CONFIG_CRITICAL_IRQSOFF_TIMING + printk(KERN_ERR "* CONFIG_CRITICAL_IRQSOFF_TIMING *\n"); +#endif +#ifdef CONFIG_FUNCTION_TRACE + printk(KERN_ERR "* CONFIG_FUNCTION_TRACE *\n"); +#endif +#ifdef CONFIG_DEBUG_SLAB + printk(KERN_ERR "* CONFIG_DEBUG_SLAB *\n"); +#endif +#ifdef CONFIG_DEBUG_PAGEALLOC + printk(KERN_ERR "* CONFIG_DEBUG_PAGEALLOC *\n"); +#endif +#ifdef CONFIG_LOCKDEP + printk(KERN_ERR "* CONFIG_LOCKDEP *\n"); +#endif + printk(KERN_ERR "* *\n"); +#if DEBUG_COUNT == 1 + printk(KERN_ERR "* it may increase runtime overhead and latencies. *\n"); +#else + printk(KERN_ERR "* they may increase runtime overhead and latencies. *\n"); +#endif + printk(KERN_ERR "* *\n"); + printk(KERN_ERR "*****************************************************************************\n"); +#endif /* * Ok, we have completed the initial bootup, and * we're essentially up and running. Get rid of the patches/preempt-realtime-compile-fixes.patch0000664000076400007640000000112211043564023020266 0ustar tglxtglx--- drivers/block/paride/pseudo.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.26/drivers/block/paride/pseudo.h =================================================================== --- linux-2.6.26.orig/drivers/block/paride/pseudo.h +++ linux-2.6.26/drivers/block/paride/pseudo.h @@ -43,7 +43,7 @@ static unsigned long ps_timeout; static int ps_tq_active = 0; static int ps_nice = 0; -static DEFINE_SPINLOCK(ps_spinlock __attribute__((unused))); +static __attribute__((unused)) DEFINE_SPINLOCK(ps_spinlock); static DECLARE_DELAYED_WORK(ps_tq, ps_tq_int); patches/preempt-realtime-console.patch0000664000076400007640000000346211043564023017175 0ustar tglxtglx--- drivers/video/console/fbcon.c | 5 +++-- include/linux/console.h | 1 + 2 files changed, 4 insertions(+), 2 deletions(-) Index: linux-2.6.26/drivers/video/console/fbcon.c =================================================================== --- linux-2.6.26.orig/drivers/video/console/fbcon.c +++ linux-2.6.26/drivers/video/console/fbcon.c @@ -1302,7 +1302,6 @@ static void fbcon_clear(struct vc_data * { struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]]; struct fbcon_ops *ops = info->fbcon_par; - struct display *p = &fb_display[vc->vc_num]; u_int y_break; @@ -1331,10 +1330,11 @@ static void fbcon_putcs(struct vc_data * struct display *p = &fb_display[vc->vc_num]; struct fbcon_ops *ops = info->fbcon_par; - if (!fbcon_is_inactive(vc, info)) + if (!fbcon_is_inactive(vc, info)) { ops->putcs(vc, info, s, count, real_y(p, ypos), xpos, get_color(vc, info, scr_readw(s), 1), get_color(vc, info, scr_readw(s), 0)); + } } static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos) @@ -3335,6 +3335,7 @@ static const struct consw fb_con = { .con_screen_pos = fbcon_screen_pos, .con_getxy = fbcon_getxy, .con_resize = fbcon_resize, + .con_preemptible = 1, }; static struct notifier_block fbcon_event_notifier = { Index: linux-2.6.26/include/linux/console.h =================================================================== --- linux-2.6.26.orig/include/linux/console.h +++ linux-2.6.26/include/linux/console.h @@ -55,6 +55,7 @@ struct consw { void (*con_invert_region)(struct vc_data *, u16 *, int); u16 *(*con_screen_pos)(struct vc_data *, int); unsigned long (*con_getxy)(struct vc_data *, unsigned long, int *, int *); + int con_preemptible; // can it reschedule from within printk? }; extern const struct consw *conswitchp; patches/preempt-realtime-debug-sysctl.patch0000664000076400007640000001133011043564023020131 0ustar tglxtglx Folded in: From leon.woestenberg@gmail.com Mon Mar 24 17:38:54 2008 Date: Fri, 29 Feb 2008 23:11:40 +0100 From: Leon Woestenberg To: linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Steven Rostedt Subject: [PATCH] Fix build, missing profile.h include in kernel/sysctl.c (against 2.6.24.3-rt3) Build fix for kernel/sysctl.c:356: error: 'prof_pid' undeclared here (not in a function). The fix is to include which defines prof_pid as external. Patch is against 2.6.24.3-rt3. Signed-off-by: Leon Woestenberg --- drivers/char/sysrq.c | 18 ++++++++++++++- drivers/char/tty_io.c | 1 kernel/panic.c | 1 kernel/sysctl.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 78 insertions(+), 1 deletion(-) Index: linux-2.6.26/drivers/char/sysrq.c =================================================================== --- linux-2.6.26.orig/drivers/char/sysrq.c +++ linux-2.6.26/drivers/char/sysrq.c @@ -251,6 +251,22 @@ static struct sysrq_key_op sysrq_showreg .enable_mask = SYSRQ_ENABLE_DUMP, }; +#if defined(__i386__) + +static void sysrq_handle_showallregs(int key, struct tty_struct *tty) +{ + nmi_show_all_regs(); +} + +static struct sysrq_key_op sysrq_showallregs_op = { + .handler = sysrq_handle_showallregs, + .help_msg = "showalLcpupc", + .action_msg = "Show Regs On All CPUs", +}; +#else +#define sysrq_showallregs_op (*(struct sysrq_key_op *)0) +#endif + static void sysrq_handle_showstate(int key, struct tty_struct *tty) { show_state(); @@ -404,7 +420,7 @@ static struct sysrq_key_op *sysrq_key_ta NULL, /* x */ /* y: May be registered on sparc64 for global register dump */ NULL, /* y */ - NULL /* z */ + &sysrq_showallregs_op, /* l */ }; /* key2index calculation, -1 on invalid index */ Index: linux-2.6.26/drivers/char/tty_io.c =================================================================== --- linux-2.6.26.orig/drivers/char/tty_io.c +++ linux-2.6.26/drivers/char/tty_io.c @@ -256,6 +256,7 @@ static int check_tty_count(struct tty_st printk(KERN_WARNING "Warning: dev (%s) tty->count(%d) " "!= #fd's(%d) in %s\n", tty->name, tty->count, count, routine); + dump_stack(); return count; } #endif Index: linux-2.6.26/kernel/panic.c =================================================================== --- linux-2.6.26.orig/kernel/panic.c +++ linux-2.6.26/kernel/panic.c @@ -80,6 +80,7 @@ NORET_TYPE void panic(const char * fmt, vsnprintf(buf, sizeof(buf), fmt, args); va_end(args); printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf); + dump_stack(); bust_spinlocks(0); /* Index: linux-2.6.26/kernel/sysctl.c =================================================================== --- linux-2.6.26.orig/kernel/sysctl.c +++ linux-2.6.26/kernel/sysctl.c @@ -47,6 +47,7 @@ #include #include #include +#include #include #include @@ -343,6 +344,54 @@ static struct ctl_table kern_table[] = { }, #endif { + .ctl_name = CTL_UNNUMBERED, + .procname = "prof_pid", + .data = &prof_pid, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, +#ifdef CONFIG_PREEMPT + { + .ctl_name = CTL_UNNUMBERED, + .procname = "kernel_preemption", + .data = &kernel_preemption, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, +#endif +#ifdef CONFIG_PREEMPT_VOLUNTARY + { + .ctl_name = CTL_UNNUMBERED, + .procname = "voluntary_preemption", + .data = &voluntary_preemption, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, +#endif +#if defined(CONFIG_PREEMPT_SOFTIRQS) && !defined(CONFIG_PREEMPT_RT) + { + .ctl_name = CTL_UNNUMBERED, + .procname = "softirq_preemption", + .data = &softirq_preemption, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, +#endif +#if defined(CONFIG_PREEMPT_HARDIRQS) && !defined(CONFIG_PREEMPT_RT) + { + .ctl_name = CTL_UNNUMBERED, + .procname = "hardirq_preemption", + .data = &hardirq_preemption, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, +#endif + { .ctl_name = KERN_PANIC, .procname = "panic", .data = &panic_timeout, @@ -350,6 +399,16 @@ static struct ctl_table kern_table[] = { .mode = 0644, .proc_handler = &proc_dointvec, }, +#ifdef CONFIG_GENERIC_HARDIRQS + { + .ctl_name = CTL_UNNUMBERED, + .procname = "debug_direct_keyboard", + .data = &debug_direct_keyboard, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, +#endif { .ctl_name = KERN_CORE_USES_PID, .procname = "core_uses_pid", patches/preempt-realtime-ide.patch0000664000076400007640000002163711043564023016300 0ustar tglxtglx--- drivers/ide/ide-floppy.c | 4 ++-- drivers/ide/ide-io.c | 4 ++-- drivers/ide/ide-iops.c | 20 ++++++++++---------- drivers/ide/ide-lib.c | 8 +++----- drivers/ide/ide-probe.c | 8 ++++---- drivers/ide/ide-taskfile.c | 6 +++--- drivers/ide/pci/alim15x3.c | 12 ++++++------ drivers/ide/pci/hpt366.c | 4 ++-- 8 files changed, 32 insertions(+), 34 deletions(-) Index: linux-2.6.26/drivers/ide/ide-floppy.c =================================================================== --- linux-2.6.26.orig/drivers/ide/ide-floppy.c +++ linux-2.6.26/drivers/ide/ide-floppy.c @@ -1171,9 +1171,9 @@ static int idefloppy_get_format_progress unsigned long flags; u8 stat; - local_irq_save(flags); + local_irq_save_nort(flags); stat = ide_read_status(drive); - local_irq_restore(flags); + local_irq_restore_nort(flags); progress_indication = ((stat & SEEK_STAT) == 0) ? 0 : 0x10000; } Index: linux-2.6.26/drivers/ide/ide-io.c =================================================================== --- linux-2.6.26.orig/drivers/ide/ide-io.c +++ linux-2.6.26/drivers/ide/ide-io.c @@ -1036,7 +1036,7 @@ static void ide_do_request (ide_hwgroup_ ide_get_lock(ide_intr, hwgroup); /* caller must own ide_lock */ - BUG_ON(!irqs_disabled()); + BUG_ON_NONRT(!irqs_disabled()); while (!hwgroup->busy) { hwgroup->busy = 1; @@ -1302,7 +1302,7 @@ void ide_timer_expiry (unsigned long dat disable_irq(hwif->irq); /* local CPU only, * as if we were handling an interrupt */ - local_irq_disable(); + local_irq_disable_nort(); if (hwgroup->polling) { startstop = handler(drive); } else if (drive_is_ready(drive)) { Index: linux-2.6.26/drivers/ide/ide-iops.c =================================================================== --- linux-2.6.26.orig/drivers/ide/ide-iops.c +++ linux-2.6.26/drivers/ide/ide-iops.c @@ -256,7 +256,7 @@ static void ata_input_data(ide_drive_t * unsigned long uninitialized_var(flags); if ((io_32bit & 2) && !mmio) { - local_irq_save(flags); + local_irq_save_nort(flags); ata_vlb_sync(io_ports->nsect_addr); } @@ -266,7 +266,7 @@ static void ata_input_data(ide_drive_t * insl(data_addr, buf, len / 4); if ((io_32bit & 2) && !mmio) - local_irq_restore(flags); + local_irq_restore_nort(flags); if ((len & 3) >= 2) { if (mmio) @@ -299,7 +299,7 @@ static void ata_output_data(ide_drive_t unsigned long uninitialized_var(flags); if ((io_32bit & 2) && !mmio) { - local_irq_save(flags); + local_irq_save_nort(flags); ata_vlb_sync(io_ports->nsect_addr); } @@ -309,7 +309,7 @@ static void ata_output_data(ide_drive_t outsl(data_addr, buf, len / 4); if ((io_32bit & 2) && !mmio) - local_irq_restore(flags); + local_irq_restore_nort(flags); if ((len & 3) >= 2) { if (mmio) @@ -537,12 +537,12 @@ static int __ide_wait_stat(ide_drive_t * if (!(stat & BUSY_STAT)) break; - local_irq_restore(flags); + local_irq_restore_nort(flags); *rstat = stat; return -EBUSY; } } - local_irq_restore(flags); + local_irq_restore_nort(flags); } /* * Allow status to settle, then read it again. @@ -711,17 +711,17 @@ int ide_driveid_update(ide_drive_t *driv printk("%s: CHECK for good STATUS\n", drive->name); return 0; } - local_irq_save(flags); + local_irq_save_nort(flags); SELECT_MASK(drive, 0); id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC); if (!id) { - local_irq_restore(flags); + local_irq_restore_nort(flags); return 0; } hwif->input_data(drive, NULL, id, SECTOR_SIZE); (void)ide_read_status(drive); /* clear drive IRQ */ - local_irq_enable(); - local_irq_restore(flags); + local_irq_enable_nort(); + local_irq_restore_nort(flags); ide_fix_driveid(id); if (id) { drive->id->dma_ultra = id->dma_ultra; Index: linux-2.6.26/drivers/ide/ide-lib.c =================================================================== --- linux-2.6.26.orig/drivers/ide/ide-lib.c +++ linux-2.6.26/drivers/ide/ide-lib.c @@ -438,14 +438,15 @@ int ide_set_xfer_rate(ide_drive_t *drive static void ide_dump_opcode(ide_drive_t *drive) { + unsigned long flags; struct request *rq; ide_task_t *task = NULL; - spin_lock(&ide_lock); + spin_lock_irqsave(&ide_lock, flags); rq = NULL; if (HWGROUP(drive)) rq = HWGROUP(drive)->rq; - spin_unlock(&ide_lock); + spin_unlock_irqrestore(&ide_lock, flags); if (!rq) return; @@ -543,10 +544,8 @@ static void ide_dump_atapi_error(ide_dri u8 ide_dump_status(ide_drive_t *drive, const char *msg, u8 stat) { - unsigned long flags; u8 err = 0; - local_irq_save(flags); printk("%s: %s: status=0x%02x { ", drive->name, msg, stat); if (stat & BUSY_STAT) printk("Busy "); @@ -569,7 +568,6 @@ u8 ide_dump_status(ide_drive_t *drive, c ide_dump_atapi_error(drive, err); } ide_dump_opcode(drive); - local_irq_restore(flags); return err; } Index: linux-2.6.26/drivers/ide/ide-probe.c =================================================================== --- linux-2.6.26.orig/drivers/ide/ide-probe.c +++ linux-2.6.26/drivers/ide/ide-probe.c @@ -127,7 +127,7 @@ static inline void do_identify (ide_driv hwif->input_data(drive, NULL, id, SECTOR_SIZE); drive->id_read = 1; - local_irq_enable(); + local_irq_enable_nort(); #ifdef DEBUG printk(KERN_INFO "%s: dumping identify data\n", drive->name); ide_dump_identify((u8 *)id); @@ -316,14 +316,14 @@ static int actual_try_to_identify (ide_d unsigned long flags; /* local CPU only; some systems need this */ - local_irq_save(flags); + local_irq_save_nort(flags); /* drive returned ID */ do_identify(drive, cmd); /* drive responded with ID */ rc = 0; /* clear drive IRQ */ (void)ide_read_status(drive); - local_irq_restore(flags); + local_irq_restore_nort(flags); } else { /* drive refused ID */ rc = 2; @@ -796,7 +796,7 @@ static int ide_probe_port(ide_hwif_t *hw rc = 0; } - local_irq_restore(flags); + local_irq_restore_nort(flags); /* * Use cached IRQ number. It might be (and is...) changed by probe Index: linux-2.6.26/drivers/ide/ide-taskfile.c =================================================================== --- linux-2.6.26.orig/drivers/ide/ide-taskfile.c +++ linux-2.6.26/drivers/ide/ide-taskfile.c @@ -270,7 +270,7 @@ static void ide_pio_sector(ide_drive_t * offset %= PAGE_SIZE; #ifdef CONFIG_HIGHMEM - local_irq_save(flags); + local_irq_save_nort(flags); #endif buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset; @@ -290,7 +290,7 @@ static void ide_pio_sector(ide_drive_t * kunmap_atomic(buf, KM_BIO_SRC_IRQ); #ifdef CONFIG_HIGHMEM - local_irq_restore(flags); + local_irq_restore_nort(flags); #endif } @@ -482,7 +482,7 @@ static ide_startstop_t pre_task_out_intr } if (!drive->unmask) - local_irq_disable(); + local_irq_disable_nort(); ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL); ide_pio_datablock(drive, rq, 1); Index: linux-2.6.26/drivers/ide/pci/alim15x3.c =================================================================== --- linux-2.6.26.orig/drivers/ide/pci/alim15x3.c +++ linux-2.6.26/drivers/ide/pci/alim15x3.c @@ -92,7 +92,7 @@ static void ali_set_pio_mode(ide_drive_t if (r_clc >= 16) r_clc = 0; } - local_irq_save(flags); + local_irq_save_nort(flags); /* * PIO mode => ATA FIFO on, ATAPI FIFO off @@ -114,7 +114,7 @@ static void ali_set_pio_mode(ide_drive_t pci_write_config_byte(dev, port, s_clc); pci_write_config_byte(dev, port+drive->select.b.unit+2, (a_clc << 4) | r_clc); - local_irq_restore(flags); + local_irq_restore_nort(flags); } /** @@ -225,7 +225,7 @@ static unsigned int __devinit init_chips isa_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL); - local_irq_save(flags); + local_irq_save_nort(flags); if (m5229_revision < 0xC2) { /* @@ -316,7 +316,7 @@ out: } pci_dev_put(north); pci_dev_put(isa_dev); - local_irq_restore(flags); + local_irq_restore_nort(flags); return 0; } @@ -378,7 +378,7 @@ static u8 __devinit ali_cable_detect(ide unsigned long flags; u8 cbl = ATA_CBL_PATA40, tmpbyte; - local_irq_save(flags); + local_irq_save_nort(flags); if (m5229_revision >= 0xC2) { /* @@ -399,7 +399,7 @@ static u8 __devinit ali_cable_detect(ide } } - local_irq_restore(flags); + local_irq_restore_nort(flags); return cbl; } Index: linux-2.6.26/drivers/ide/pci/hpt366.c =================================================================== --- linux-2.6.26.orig/drivers/ide/pci/hpt366.c +++ linux-2.6.26/drivers/ide/pci/hpt366.c @@ -1326,7 +1326,7 @@ static int __devinit init_dma_hpt366(ide dma_old = inb(base + 2); - local_irq_save(flags); + local_irq_save_nort(flags); dma_new = dma_old; pci_read_config_byte(dev, hwif->channel ? 0x4b : 0x43, &masterdma); @@ -1337,7 +1337,7 @@ static int __devinit init_dma_hpt366(ide if (dma_new != dma_old) outb(dma_new, base + 2); - local_irq_restore(flags); + local_irq_restore_nort(flags); printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx\n", hwif->name, base, base + 7); patches/preempt-realtime-input.patch0000664000076400007640000000246311043564023016672 0ustar tglxtglx--- drivers/input/gameport/gameport.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) Index: linux-2.6.26/drivers/input/gameport/gameport.c =================================================================== --- linux-2.6.26.orig/drivers/input/gameport/gameport.c +++ linux-2.6.26/drivers/input/gameport/gameport.c @@ -20,6 +20,7 @@ #include #include #include +#include #include /* HZ */ #include #include @@ -99,12 +100,12 @@ static int gameport_measure_speed(struct tx = 1 << 30; for(i = 0; i < 50; i++) { - local_irq_save(flags); + local_irq_save_nort(flags); GET_TIME(t1); for (t = 0; t < 50; t++) gameport_read(gameport); GET_TIME(t2); GET_TIME(t3); - local_irq_restore(flags); + local_irq_restore_nort(flags); udelay(i * 10); if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t; } @@ -123,11 +124,11 @@ static int gameport_measure_speed(struct tx = 1 << 30; for(i = 0; i < 50; i++) { - local_irq_save(flags); + local_irq_save_nort(flags); rdtscl(t1); for (t = 0; t < 50; t++) gameport_read(gameport); rdtscl(t2); - local_irq_restore(flags); + local_irq_restore_nort(flags); udelay(i * 10); if (t2 - t1 < tx) tx = t2 - t1; } patches/preempt-realtime-irqs.patch0000664000076400007640000001103411043564022016502 0ustar tglxtglx--- include/linux/irq.h | 10 ++++------ kernel/irq/handle.c | 10 +++++++++- kernel/irq/manage.c | 22 ++++++++++++++++------ kernel/irq/spurious.c | 3 +-- 4 files changed, 30 insertions(+), 15 deletions(-) Index: linux-2.6.26/include/linux/irq.h =================================================================== --- linux-2.6.26.orig/include/linux/irq.h +++ linux-2.6.26/include/linux/irq.h @@ -147,7 +147,6 @@ struct irq_chip { * @last_unhandled: aging timer for unhandled count * @thread: Thread pointer for threaded preemptible irq handling * @wait_for_handler: Waitqueue to wait for a running preemptible handler - * @cycles: Timestamp for stats and debugging * @lock: locking for SMP * @affinity: IRQ affinity on SMP * @cpu: cpu index useful for balancing @@ -170,10 +169,10 @@ struct irq_desc { unsigned int irq_count; /* For detecting broken IRQs */ unsigned int irqs_unhandled; unsigned long last_unhandled; /* Aging timer for unhandled count */ - struct task_struct *thread; - wait_queue_head_t wait_for_handler; - cycles_t timestamp; - spinlock_t lock; + struct task_struct *thread; + wait_queue_head_t wait_for_handler; + cycles_t timestamp; + raw_spinlock_t lock; #ifdef CONFIG_SMP cpumask_t affinity; unsigned int cpu; @@ -398,7 +397,6 @@ extern int set_irq_msi(unsigned int irq, /* Early initialization of irqs */ extern void early_init_hardirqs(void); -extern cycles_t irq_timestamp(unsigned int irq); #if defined(CONFIG_PREEMPT_HARDIRQS) extern void init_hardirqs(void); Index: linux-2.6.26/kernel/irq/handle.c =================================================================== --- linux-2.6.26.orig/kernel/irq/handle.c +++ linux-2.6.26/kernel/irq/handle.c @@ -54,12 +54,13 @@ struct irq_desc irq_desc[NR_IRQS] __cach .chip = &no_irq_chip, .handle_irq = handle_bad_irq, .depth = 1, - .lock = __SPIN_LOCK_UNLOCKED(irq_desc->lock), + .lock = RAW_SPIN_LOCK_UNLOCKED(irq_desc), #ifdef CONFIG_SMP .affinity = CPU_MASK_ALL #endif } }; +EXPORT_SYMBOL_GPL(irq_desc); /* * What should we do if we get a hw irq event on an illegal vector? @@ -248,6 +249,13 @@ unsigned int __do_IRQ(unsigned int irq) desc->chip->end(irq); return 1; } + /* + * If the task is currently running in user mode, don't + * detect soft lockups. If CONFIG_DETECT_SOFTLOCKUP is not + * configured, this should be optimized out. + */ + if (user_mode(get_irq_regs())) + touch_softlockup_watchdog(); spin_lock(&desc->lock); if (desc->chip->ack) Index: linux-2.6.26/kernel/irq/manage.c =================================================================== --- linux-2.6.26.orig/kernel/irq/manage.c +++ linux-2.6.26/kernel/irq/manage.c @@ -516,9 +516,9 @@ void free_irq(unsigned int irq, void *de * parallel with our fake */ if (action->flags & IRQF_SHARED) { - local_irq_save(flags); + local_irq_save_nort(flags); action->handler(irq, dev_id); - local_irq_restore(flags); + local_irq_restore_nort(flags); } #endif kfree(action); @@ -613,9 +613,9 @@ int request_irq(unsigned int irq, irq_ha */ unsigned long flags; - local_irq_save(flags); + local_irq_save_nort(flags); handler(irq, dev_id); - local_irq_restore(flags); + local_irq_restore_nort(flags); } #endif @@ -633,6 +633,11 @@ int hardirq_preemption = 1; EXPORT_SYMBOL(hardirq_preemption); +/* + * Real-Time Preemption depends on hardirq threading: + */ +#ifndef CONFIG_PREEMPT_RT + static int __init hardirq_preempt_setup (char *str) { if (!strncmp(str, "off", 3)) @@ -647,6 +652,7 @@ static int __init hardirq_preempt_setup __setup("hardirq-preempt=", hardirq_preempt_setup); +#endif /* * threaded simple handler @@ -806,12 +812,16 @@ static int do_irqd(void * __desc) sys_sched_setscheduler(current->pid, SCHED_FIFO, ¶m); while (!kthread_should_stop()) { - local_irq_disable(); + local_irq_disable_nort(); set_current_state(TASK_INTERRUPTIBLE); +#ifndef CONFIG_PREEMPT_RT irq_enter(); +#endif do_hardirq(desc); +#ifndef CONFIG_PREEMPT_RT irq_exit(); - local_irq_enable(); +#endif + local_irq_enable_nort(); cond_resched(); #ifdef CONFIG_SMP /* Index: linux-2.6.26/kernel/irq/spurious.c =================================================================== --- linux-2.6.26.orig/kernel/irq/spurious.c +++ linux-2.6.26/kernel/irq/spurious.c @@ -62,9 +62,8 @@ static int misrouted_irq(int irq) } action = action->next; } - local_irq_disable(); /* Now clean up the flags */ - spin_lock(&desc->lock); + spin_lock_irq(&desc->lock); action = desc->action; /* patches/preempt-realtime-net-drivers.patch0000664000076400007640000000104111043564022017763 0ustar tglxtglx--- drivers/net/tulip/tulip_core.c | 1 + 1 file changed, 1 insertion(+) Index: linux-2.6.26/drivers/net/tulip/tulip_core.c =================================================================== --- linux-2.6.26.orig/drivers/net/tulip/tulip_core.c +++ linux-2.6.26/drivers/net/tulip/tulip_core.c @@ -1799,6 +1799,7 @@ static void __devexit tulip_remove_one ( pci_iounmap(pdev, tp->base_addr); free_netdev (dev); pci_release_regions (pdev); + pci_disable_device (pdev); pci_set_drvdata (pdev, NULL); /* pci_power_off (pdev, -1); */ patches/preempt-realtime-printk.patch0000664000076400007640000001155411043564022017042 0ustar tglxtglx--- kernel/printk.c | 63 +++++++++++++++++++++++++++++++++++++++++++++----------- lib/ratelimit.c | 2 - 2 files changed, 52 insertions(+), 13 deletions(-) Index: linux-2.6.26/kernel/printk.c =================================================================== --- linux-2.6.26.orig/kernel/printk.c +++ linux-2.6.26/kernel/printk.c @@ -90,7 +90,7 @@ static int console_locked, console_suspe * It is also used in interesting ways to provide interlocking in * release_console_sem(). */ -static DEFINE_SPINLOCK(logbuf_lock); +static DEFINE_RAW_SPINLOCK(logbuf_lock); #define LOG_BUF_MASK (log_buf_len-1) #define LOG_BUF(idx) (log_buf[(idx) & LOG_BUF_MASK]) @@ -444,7 +444,7 @@ static void __call_console_drivers(unsig for (con = console_drivers; con; con = con->next) { if ((con->flags & CON_ENABLED) && con->write && - (cpu_online(smp_processor_id()) || + (cpu_online(raw_smp_processor_id()) || (con->flags & CON_ANYTIME))) con->write(con, &LOG_BUF(start), end - start); } @@ -560,6 +560,7 @@ static void zap_locks(void) spin_lock_init(&logbuf_lock); /* And make sure that we print immediately */ init_MUTEX(&console_sem); + zap_rt_locks(); } #if defined(CONFIG_PRINTK_TIME) @@ -642,7 +643,8 @@ static inline int can_use_console(unsign * interrupts disabled. It should return with 'lockbuf_lock' * released but interrupts still disabled. */ -static int acquire_console_semaphore_for_printk(unsigned int cpu) +static int acquire_console_semaphore_for_printk(unsigned int cpu, + unsigned long flags) { int retval = 0; @@ -663,6 +665,8 @@ static int acquire_console_semaphore_for } printk_cpu = UINT_MAX; spin_unlock(&logbuf_lock); + lockdep_on(); + local_irq_restore(flags); return retval; } @@ -685,7 +689,7 @@ asmlinkage int vprintk(const char *fmt, preempt_disable(); /* This stops the holder of console_sem just where we want him */ raw_local_irq_save(flags); - this_cpu = smp_processor_id(); + this_cpu = raw_smp_processor_id(); /* * Ouch, printk recursed into itself! @@ -700,7 +704,8 @@ asmlinkage int vprintk(const char *fmt, */ if (!oops_in_progress) { printk_recursion_bug = 1; - goto out_restore_irqs; + raw_local_irq_restore(flags); + goto out; } zap_locks(); } @@ -708,6 +713,7 @@ asmlinkage int vprintk(const char *fmt, lockdep_off(); spin_lock(&logbuf_lock); printk_cpu = this_cpu; + preempt_enable(); if (printk_recursion_bug) { printk_recursion_bug = 0; @@ -785,14 +791,10 @@ asmlinkage int vprintk(const char *fmt, * will release 'logbuf_lock' regardless of whether it * actually gets the semaphore or not. */ - if (acquire_console_semaphore_for_printk(this_cpu)) + if (acquire_console_semaphore_for_printk(this_cpu, flags)) release_console_sem(); - lockdep_on(); -out_restore_irqs: - raw_local_irq_restore(flags); - - preempt_enable(); +out: return printed_len; } EXPORT_SYMBOL(printk); @@ -1040,13 +1042,33 @@ void release_console_sem(void) _con_start = con_start; _log_end = log_end; con_start = log_end; /* Flush */ + /* + * on PREEMPT_RT, call console drivers with + * interrupts enabled (if printk was called + * with interrupts disabled): + */ +#ifdef CONFIG_PREEMPT_RT + spin_unlock_irqrestore(&logbuf_lock, flags); +#else spin_unlock(&logbuf_lock); +#endif call_console_drivers(_con_start, _log_end); +#ifndef CONFIG_PREEMPT_RT local_irq_restore(flags); +#endif } console_locked = 0; - up(&console_sem); spin_unlock_irqrestore(&logbuf_lock, flags); + up(&console_sem); + /* + * On PREEMPT_RT kernels __wake_up may sleep, so wake syslogd + * up only if we are in a preemptible section. We normally dont + * printk from non-preemptible sections so this is for the emergency + * case only. + */ +#ifdef CONFIG_PREEMPT_RT + if (!in_atomic() && !irqs_disabled()) +#endif if (wake_klogd) wake_up_klogd(); } @@ -1346,6 +1368,23 @@ int printk_ratelimit(void) } EXPORT_SYMBOL(printk_ratelimit); +static DEFINE_RAW_SPINLOCK(warn_lock); + +void __WARN_ON(const char *func, const char *file, const int line) +{ + unsigned long flags; + + spin_lock_irqsave(&warn_lock, flags); + printk("%s/%d[CPU#%d]: BUG in %s at %s:%d\n", + current->comm, current->pid, raw_smp_processor_id(), + func, file, line); + dump_stack(); + spin_unlock_irqrestore(&warn_lock, flags); +} + +EXPORT_SYMBOL(__WARN_ON); + + /** * printk_timed_ratelimit - caller-controlled printk ratelimiting * @caller_jiffies: pointer to caller's state Index: linux-2.6.26/lib/ratelimit.c =================================================================== --- linux-2.6.26.orig/lib/ratelimit.c +++ linux-2.6.26/lib/ratelimit.c @@ -21,7 +21,7 @@ */ int __ratelimit(int ratelimit_jiffies, int ratelimit_burst) { - static DEFINE_SPINLOCK(ratelimit_lock); + static DEFINE_RAW_SPINLOCK(ratelimit_lock); static unsigned toks = 10 * 5 * HZ; static unsigned long last_msg; static int missed; patches/preempt-realtime-profiling.patch0000664000076400007640000000213711043564022017521 0ustar tglxtglx--- kernel/profile.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) Index: linux-2.6.26/kernel/profile.c =================================================================== --- linux-2.6.26.orig/kernel/profile.c +++ linux-2.6.26/kernel/profile.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -44,6 +45,7 @@ int prof_on __read_mostly; EXPORT_SYMBOL_GPL(prof_on); static cpumask_t prof_cpu_mask = CPU_MASK_ALL; +int prof_pid = -1; #ifdef CONFIG_SMP static DEFINE_PER_CPU(struct profile_hit *[2], cpu_profile_hits); static DEFINE_PER_CPU(int, cpu_profile_flip); @@ -411,7 +413,8 @@ void __profile_tick(int type, struct pt_ { if (type == CPU_PROFILING && timer_hook) timer_hook(regs); - if (!user_mode(regs) && cpu_isset(smp_processor_id(), prof_cpu_mask)) + if (!user_mode(regs) && cpu_isset(smp_processor_id(), prof_cpu_mask) && + (prof_pid == -1 || prof_pid == current->pid)) profile_hit(type, (void *)profile_pc(regs)); } patches/preempt-realtime-rawlocks.patch0000664000076400007640000000776111043564022017365 0ustar tglxtglx--- drivers/oprofile/oprofilefs.c | 2 +- drivers/pci/access.c | 2 +- drivers/video/console/vgacon.c | 2 +- include/linux/kprobes.h | 2 +- include/linux/oprofile.h | 2 +- include/linux/percpu_counter.h | 2 +- kernel/kprobes.c | 2 +- kernel/softlockup.c | 2 +- 8 files changed, 8 insertions(+), 8 deletions(-) Index: linux-2.6.26/drivers/oprofile/oprofilefs.c =================================================================== --- linux-2.6.26.orig/drivers/oprofile/oprofilefs.c +++ linux-2.6.26/drivers/oprofile/oprofilefs.c @@ -21,7 +21,7 @@ #define OPROFILEFS_MAGIC 0x6f70726f -DEFINE_SPINLOCK(oprofilefs_lock); +DEFINE_RAW_SPINLOCK(oprofilefs_lock); static struct inode * oprofilefs_get_inode(struct super_block * sb, int mode) { Index: linux-2.6.26/drivers/pci/access.c =================================================================== --- linux-2.6.26.orig/drivers/pci/access.c +++ linux-2.6.26/drivers/pci/access.c @@ -12,7 +12,7 @@ * configuration space. */ -static DEFINE_SPINLOCK(pci_lock); +static DEFINE_RAW_SPINLOCK(pci_lock); /* * Wrappers for all PCI configuration access functions. They just check Index: linux-2.6.26/drivers/video/console/vgacon.c =================================================================== --- linux-2.6.26.orig/drivers/video/console/vgacon.c +++ linux-2.6.26/drivers/video/console/vgacon.c @@ -51,7 +51,7 @@ #include