/* vm.c -- Memory mapping for DRM -*- linux-c -*- * Created: Mon Jan 4 08:58:31 1999 by faith@precisioninsight.com * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. * * Authors: * Rickard E. (Rik) Faith * */ #define __NO_VERSION__ #include "drmP.h" struct vm_operations_struct drm_vm_ops = { nopage: drm_vm_nopage, open: drm_vm_open, close: drm_vm_close, }; struct vm_operations_struct drm_vm_shm_ops = { nopage: drm_vm_shm_nopage, open: drm_vm_open, close: drm_vm_close, }; struct vm_operations_struct drm_vm_shm_lock_ops = { nopage: drm_vm_shm_nopage_lock, open: drm_vm_open, close: drm_vm_close, }; struct vm_operations_struct drm_vm_dma_ops = { nopage: drm_vm_dma_nopage, open: drm_vm_open, close: drm_vm_close, }; #if LINUX_VERSION_CODE < 0x020317 unsigned long drm_vm_nopage(struct vm_area_struct *vma, unsigned long address, int write_access) #else /* Return type changed in 2.3.23 */ struct page *drm_vm_nopage(struct vm_area_struct *vma, unsigned long address, int write_access) #endif { return NOPAGE_SIGBUS; /* Disallow mremap */ } #if LINUX_VERSION_CODE < 0x020317 unsigned long drm_vm_shm_nopage(struct vm_area_struct *vma, unsigned long address, int write_access) #else /* Return type changed in 2.3.23 */ struct page *drm_vm_shm_nopage(struct vm_area_struct *vma, unsigned long address, int write_access) #endif { #if LINUX_VERSION_CODE >= 0x020300 drm_map_t *map = (drm_map_t *)vma->vm_private_data; #else drm_map_t *map = (drm_map_t *)vma->vm_pte; #endif unsigned long physical; unsigned long offset; if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */ if (!map) return NOPAGE_OOM; /* Nothing allocated */ offset = address - vma->vm_start; physical = (unsigned long)map->handle + offset; atomic_inc(&virt_to_page(physical)->count); /* Dec. by kernel */ DRM_DEBUG("0x%08lx => 0x%08lx\n", address, physical); #if LINUX_VERSION_CODE < 0x020317 return physical; #else return virt_to_page(physical); #endif } #if LINUX_VERSION_CODE < 0x020317 unsigned long drm_vm_shm_nopage_lock(struct vm_area_struct *vma, unsigned long address, int write_access) #else /* Return type changed in 2.3.23 */ struct page *drm_vm_shm_nopage_lock(struct vm_area_struct *vma, unsigned long address, int write_access) #endif { drm_file_t *priv = vma->vm_file->private_data; drm_device_t *dev = priv->dev; unsigned long physical; unsigned long offset; unsigned long page; if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */ if (!dev->lock.hw_lock) return NOPAGE_OOM; /* Nothing allocated */ offset = address - vma->vm_start; page = offset >> PAGE_SHIFT; physical = (unsigned long)dev->lock.hw_lock + offset; atomic_inc(&virt_to_page(physical)->count); /* Dec. by kernel */ DRM_DEBUG("0x%08lx (page %lu) => 0x%08lx\n", address, page, physical); #if LINUX_VERSION_CODE < 0x020317 return physical; #else return virt_to_page(physical); #endif } #if LINUX_VERSION_CODE < 0x020317 unsigned long drm_vm_dma_nopage(struct vm_area_struct *vma, unsigned long address, int write_access) #else /* Return type changed in 2.3.23 */ struct page *drm_vm_dma_nopage(struct vm_area_struct *vma, unsigned long address, int write_access) #endif { drm_file_t *priv = vma->vm_file->private_data; drm_device_t *dev = priv->dev; drm_device_dma_t *dma = dev->dma; unsigned long physical; unsigned long offset; unsigned long page; if (!dma) return NOPAGE_SIGBUS; /* Error */ if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */ if (!dma->pagelist) return NOPAGE_OOM ; /* Nothing allocated */ offset = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ page = offset >> PAGE_SHIFT; physical = dma->pagelist[page] + (offset & (~PAGE_MASK)); atomic_inc(&virt_to_page(physical)->count); /* Dec. by kernel */ DRM_DEBUG("0x%08lx (page %lu) => 0x%08lx\n", address, page, physical); #if LINUX_VERSION_CODE < 0x020317 return physical; #else return virt_to_page(physical); #endif } void drm_vm_open(struct vm_area_struct *vma) { drm_file_t *priv = vma->vm_file->private_data; drm_device_t *dev = priv->dev; #if DRM_DEBUG_CODE drm_vma_entry_t *vma_entry; #endif DRM_DEBUG("0x%08lx,0x%08lx\n", vma->vm_start, vma->vm_end - vma->vm_start); atomic_inc(&dev->vma_count); #if LINUX_VERSION_CODE < 0x020333 /* The map can exist after the fd is closed. */ MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */ #endif #if DRM_DEBUG_CODE vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS); if (vma_entry) { down(&dev->struct_sem); vma_entry->vma = vma; vma_entry->next = dev->vmalist; vma_entry->pid = current->pid; dev->vmalist = vma_entry; up(&dev->struct_sem); } #endif } void drm_vm_close(struct vm_area_struct *vma) { drm_file_t *priv = vma->vm_file->private_data; drm_device_t *dev = priv->dev; #if DRM_DEBUG_CODE drm_vma_entry_t *pt, *prev; #endif DRM_DEBUG("0x%08lx,0x%08lx\n", vma->vm_start, vma->vm_end - vma->vm_start); #if LINUX_VERSION_CODE < 0x020333 MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */ #endif atomic_dec(&dev->vma_count); #if DRM_DEBUG_CODE down(&dev->struct_sem); for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) { if (pt->vma == vma) { if (prev) { prev->next = pt->next; } else { dev->vmalist = pt->next; } drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); break; } } up(&dev->struct_sem); #endif } int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) { drm_file_t *priv = filp->private_data; drm_device_t *dev; drm_device_dma_t *dma; unsigned long length = vma->vm_end - vma->vm_start; lock_kernel(); dev = priv->dev; dma = dev->dma; DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n", vma->vm_start, vma->vm_end, VM_OFFSET(vma)); /* Length must match exact page count */ if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { unlock_kernel(); return -EINVAL; } unlock_kernel(); vma->vm_ops = &drm_vm_dma_ops; vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */ #if LINUX_VERSION_CODE < 0x020203 /* KERNEL_VERSION(2,2,3) */ /* In Linux 2.2.3 and above, this is handled in do_mmap() in mm/mmap.c. */ ++filp->f_count; #endif vma->vm_file = filp; /* Needed for drm_vm_open() */ drm_vm_open(vma); return 0; } int drm_mmap(struct file *filp, struct vm_area_struct *vma) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->dev; drm_map_t *map = NULL; int i; DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n", vma->vm_start, vma->vm_end, VM_OFFSET(vma)); if (!VM_OFFSET(vma)) return drm_mmap_dma(filp, vma); /* A sequential search of a linked list is fine here because: 1) there will only be about 5-10 entries in the list and, 2) a DRI client only has to do this mapping once, so it doesn't have to be optimized for performance, even if the list was a bit longer. */ for (i = 0; i < dev->map_count; i++) { map = dev->maplist[i]; if (map->offset == VM_OFFSET(vma)) break; } if (i >= dev->map_count) return -EINVAL; if (!map || ((map->flags&_DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) return -EPERM; /* Check for valid size. */ if (map->size != vma->vm_end - vma->vm_start) return -EINVAL; if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { vma->vm_flags &= VM_MAYWRITE; #if defined(__i386__) pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; #else /* Ye gads this is ugly. With more thought we could move this up higher and use `protection_map' instead. */ vma->vm_page_prot = __pgprot(pte_val(pte_wrprotect( __pte(pgprot_val(vma->vm_page_prot))))); #endif } switch (map->type) { case _DRM_FRAME_BUFFER: case _DRM_REGISTERS: case _DRM_AGP: if (VM_OFFSET(vma) >= __pa(high_memory)) { #if defined(__i386__) || defined(__x86_64__) if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) { pgprot_val(vma->vm_page_prot) |= _PAGE_PCD; pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT; } #elif defined(__ia64__) if (map->type != _DRM_AGP) vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); #endif vma->vm_flags |= VM_IO; /* not in core dump */ } if (remap_page_range(vma->vm_start, VM_OFFSET(vma), vma->vm_end - vma->vm_start, vma->vm_page_prot)) return -EAGAIN; DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," " offset = 0x%lx\n", map->type, vma->vm_start, vma->vm_end, VM_OFFSET(vma)); vma->vm_ops = &drm_vm_ops; break; case _DRM_SHM: if (map->flags & _DRM_CONTAINS_LOCK) vma->vm_ops = &drm_vm_shm_lock_ops; else { vma->vm_ops = &drm_vm_shm_ops; #if LINUX_VERSION_CODE >= 0x020300 vma->vm_private_data = (void *)map; #else vma->vm_pte = (unsigned long)map; #endif } /* Don't let this area swap. Change when DRM_KERNEL advisory is supported. */ vma->vm_flags |= VM_LOCKED; break; default: return -EINVAL; /* This should never happen. */ } vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */ #if LINUX_VERSION_CODE < 0x020203 /* KERNEL_VERSION(2,2,3) */ /* In Linux 2.2.3 and above, this is handled in do_mmap() in mm/mmap.c. */ ++filp->f_count; #endif vma->vm_file = filp; /* Needed for drm_vm_open() */ drm_vm_open(vma); return 0; }