/* drm_vm.h -- Memory mapping for DRM -*- linux-c -*- * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.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 * VA LINUX SYSTEMS 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 * Gareth Hughes */ #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_shm_close), }; struct vm_operations_struct DRM(vm_dma_ops) = { nopage: DRM(vm_dma_nopage), open: DRM(vm_open), close: DRM(vm_close), }; struct vm_operations_struct DRM(vm_sg_ops) = { nopage: DRM(vm_sg_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 unused) #else /* Return type changed in 2.3.23 */ struct page *DRM(vm_nopage)(struct vm_area_struct *vma, unsigned long address, int unused) #endif { #if __REALLY_HAVE_AGP drm_file_t *priv = vma->vm_file->private_data; drm_device_t *dev = priv->dev; drm_map_t *map = NULL; drm_map_list_t *r_list; struct list_head *list; /* * Find the right map */ if(!dev->agp->cant_use_aperture) goto vm_nopage_error; list_for_each(list, &dev->maplist->head) { r_list = (drm_map_list_t *)list; map = r_list->map; if (!map) continue; if (map->offset == VM_OFFSET(vma)) break; } if (map && map->type == _DRM_AGP) { unsigned long offset = address - vma->vm_start; unsigned long baddr = VM_OFFSET(vma) + offset; struct drm_agp_mem *agpmem; struct page *page; #if __alpha__ /* * Adjust to a bus-relative address */ baddr -= dev->hose->mem_space->start; #endif /* * It's AGP memory - find the real physical page to map */ for(agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) { if (agpmem->bound <= baddr && agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) break; } if (!agpmem) goto vm_nopage_error; /* * Get the page, inc the use count, and return it */ offset = (baddr - agpmem->bound) >> PAGE_SHIFT; agpmem->memory->memory[offset] &= dev->agp->page_mask; page = virt_to_page(__va(agpmem->memory->memory[offset])); get_page(page); DRM_DEBUG("baddr = 0x%lx page = 0x%p, offset = 0x%lx\n", baddr, __va(agpmem->memory->memory[offset]), offset); #if LINUX_VERSION_CODE < 0x020317 return page_address(page); #else return page; #endif } vm_nopage_error: #endif /* __REALLY_HAVE_AGP */ 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 unused) #else /* Return type changed in 2.3.23 */ struct page *DRM(vm_shm_nopage)(struct vm_area_struct *vma, unsigned long address, int unused) #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 offset; unsigned long i; pgd_t *pgd; pmd_t *pmd; pte_t *pte; struct page *page; if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */ if (!map) return NOPAGE_OOM; /* Nothing allocated */ offset = address - vma->vm_start; i = (unsigned long)map->handle + offset; /* We have to walk page tables here because we need large SAREA's, and * they need to be virtually contiguous in kernel space. */ pgd = pgd_offset_k( i ); if( !pgd_present( *pgd ) ) return NOPAGE_OOM; pmd = pmd_offset( pgd, i ); if( !pmd_present( *pmd ) ) return NOPAGE_OOM; pte = pte_offset( pmd, i ); if( !pte_present( *pte ) ) return NOPAGE_OOM; page = pte_page(*pte); get_page(page); DRM_DEBUG("shm_nopage 0x%lx\n", address); #if LINUX_VERSION_CODE < 0x020317 return page_address(page); #else return page; #endif } /* Special close routine which deletes map information if we are the last * person to close a mapping and its not in the global maplist. */ void DRM(vm_shm_close)(struct vm_area_struct *vma) { drm_file_t *priv = vma->vm_file->private_data; drm_device_t *dev = priv->dev; drm_vma_entry_t *pt, *prev, *next; drm_map_t *map; drm_map_list_t *r_list; struct list_head *list; int found_maps = 0; 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 LINUX_VERSION_CODE >= 0x020300 map = vma->vm_private_data; #else map = vma->vm_pte; #endif down(&dev->struct_sem); for (pt = dev->vmalist, prev = NULL; pt; pt = next) { next = pt->next; #if LINUX_VERSION_CODE >= 0x020300 if (pt->vma->vm_private_data == map) found_maps++; #else if (pt->vma->vm_pte == map) found_maps++; #endif if (pt->vma == vma) { if (prev) { prev->next = pt->next; } else { dev->vmalist = pt->next; } DRM(free)(pt, sizeof(*pt), DRM_MEM_VMAS); } else { prev = pt; } } /* We were the only map that was found */ if(found_maps == 1 && map->flags & _DRM_REMOVABLE) { /* Check to see if we are in the maplist, if we are not, then * we delete this mappings information. */ found_maps = 0; list = &dev->maplist->head; list_for_each(list, &dev->maplist->head) { r_list = (drm_map_list_t *) list; if (r_list->map == map) found_maps++; } if(!found_maps) { switch (map->type) { case _DRM_REGISTERS: case _DRM_FRAME_BUFFER: #if __REALLY_HAVE_MTRR if (map->mtrr >= 0) { int retcode; retcode = mtrr_del(map->mtrr, map->offset, map->size); DRM_DEBUG("mtrr_del = %d\n", retcode); } #endif DRM(ioremapfree)(map->handle, map->size); break; case _DRM_SHM: vfree(map->handle); break; case _DRM_AGP: case _DRM_SCATTER_GATHER: break; } DRM(free)(map, sizeof(*map), DRM_MEM_MAPS); } } up(&dev->struct_sem); } #if LINUX_VERSION_CODE < 0x020317 unsigned long DRM(vm_dma_nopage)(struct vm_area_struct *vma, unsigned long address, int unused) #else /* Return type changed in 2.3.23 */ struct page *DRM(vm_dma_nopage)(struct vm_area_struct *vma, unsigned long address, int unused) #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 offset; unsigned long page_nr; struct page *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_nr = offset >> PAGE_SHIFT; page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK)))); get_page(page); DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr); #if LINUX_VERSION_CODE < 0x020317 return page_address(page); #else return page; #endif } #if LINUX_VERSION_CODE < 0x020317 unsigned long DRM(vm_sg_nopage)(struct vm_area_struct *vma, unsigned long address, int unused) #else /* Return type changed in 2.3.23 */ struct page *DRM(vm_sg_nopage)(struct vm_area_struct *vma, unsigned long address, int unused) #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 drm_file_t *priv = vma->vm_file->private_data; drm_device_t *dev = priv->dev; drm_sg_mem_t *entry = dev->sg; unsigned long offset; unsigned long map_offset; unsigned long page_offset; struct page *page; if (!entry) return NOPAGE_SIGBUS; /* Error */ if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */ if (!entry->pagelist) return NOPAGE_OOM ; /* Nothing allocated */ offset = address - vma->vm_start; map_offset = map->offset - dev->sg->handle; page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); page = entry->pagelist[page_offset]; get_page(page); #if LINUX_VERSION_CODE < 0x020317 return page_address(page); #else return page; #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; drm_vma_entry_t *vma_entry; 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 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); } } void DRM(vm_close)(struct vm_area_struct *vma) { drm_file_t *priv = vma->vm_file->private_data; drm_device_t *dev = priv->dev; drm_vma_entry_t *pt, *prev; 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); 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); } 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_RESERVED; /* 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; } #ifndef DRIVER_GET_MAP_OFS #define DRIVER_GET_MAP_OFS() (map->offset) #endif #ifndef DRIVER_GET_REG_OFS #ifdef __alpha__ #define DRIVER_GET_REG_OFS() (dev->hose->dense_mem_base - \ dev->hose->mem_space->start) #else #define DRIVER_GET_REG_OFS() 0 #endif #endif 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; drm_map_list_t *r_list; unsigned long offset = 0; struct list_head *list; DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n", vma->vm_start, vma->vm_end, VM_OFFSET(vma)); if ( !priv->authenticated ) return -EACCES; 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. */ list_for_each(list, &dev->maplist->head) { unsigned long off; r_list = (drm_map_list_t *)list; map = r_list->map; if (!map) continue; off = DRIVER_GET_MAP_OFS(); if (off == VM_OFFSET(vma)) break; } 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_AGP: #if defined(__alpha__) /* * On Alpha we can't talk to bus dma address from the * CPU, so for memory of type DRM_AGP, we'll deal with * sorting out the real physical pages and mappings * in nopage() */ vma->vm_ops = &DRM(vm_ops); break; #endif /* fall through to _DRM_FRAME_BUFFER... */ case _DRM_FRAME_BUFFER: case _DRM_REGISTERS: if (VM_OFFSET(vma) >= __pa(high_memory)) { #if defined(__i386__) 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); #elif defined(__powerpc__) pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE | _PAGE_GUARDED; #endif vma->vm_flags |= VM_IO; /* not in core dump */ } offset = DRIVER_GET_REG_OFS(); #ifdef __sparc__ if (io_remap_page_range(vma->vm_start, VM_OFFSET(vma) + offset, vma->vm_end - vma->vm_start, vma->vm_page_prot, 0)) #else if (remap_page_range(vma->vm_start, VM_OFFSET(vma) + offset, vma->vm_end - vma->vm_start, vma->vm_page_prot)) #endif 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) + offset); vma->vm_ops = &DRM(vm_ops); break; case _DRM_SHM: 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_RESERVED; break; case _DRM_SCATTER_GATHER: vma->vm_ops = &DRM(vm_sg_ops); #if LINUX_VERSION_CODE >= 0x020300 vma->vm_private_data = (void *)map; #else vma->vm_pte = (unsigned long)map; #endif vma->vm_flags |= VM_RESERVED; break; default: return -EINVAL; /* This should never happen. */ } vma->vm_flags |= VM_RESERVED; /* 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; }