diff options
Diffstat (limited to 'drivers/char/drm/drm_vm.c')
| -rw-r--r-- | drivers/char/drm/drm_vm.c | 365 |
1 files changed, 192 insertions, 173 deletions
diff --git a/drivers/char/drm/drm_vm.c b/drivers/char/drm/drm_vm.c index 39ea96e42c5b..3f73aa774c80 100644 --- a/drivers/char/drm/drm_vm.c +++ b/drivers/char/drm/drm_vm.c @@ -1,7 +1,7 @@ /** - * \file drm_vm.h + * \file drm_vm.c * Memory mapping for DRM - * + * * \author Rickard E. (Rik) Faith <faith@valinux.com> * \author Gareth Hughes <gareth@valinux.com> */ @@ -47,32 +47,34 @@ static void drm_vm_close(struct vm_area_struct *vma); * \param vma virtual memory area. * \param address access address. * \return pointer to the page structure. - * + * * Find the right map and if it's AGP memory find the real physical page to * map, get the page, increment the use count and return it. */ #if __OS_HAS_AGP static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, - unsigned long address) + unsigned long address) { - drm_file_t *priv = vma->vm_file->private_data; + drm_file_t *priv = vma->vm_file->private_data; drm_device_t *dev = priv->head->dev; - drm_map_t *map = NULL; - drm_map_list_t *r_list; + drm_map_t *map = NULL; + drm_map_list_t *r_list; struct list_head *list; /* - * Find the right map - */ + * Find the right map + */ if (!drm_core_has_AGP(dev)) goto vm_nopage_error; - if(!dev->agp || !dev->agp->cant_use_aperture) goto vm_nopage_error; + if (!dev->agp || !dev->agp->cant_use_aperture) + goto vm_nopage_error; list_for_each(list, &dev->maplist->head) { r_list = list_entry(list, drm_map_list_t, head); map = r_list->map; - if (!map) continue; + if (!map) + continue; if (r_list->user_token == VM_OFFSET(vma)) break; } @@ -85,45 +87,47 @@ static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, #ifdef __alpha__ /* - * Adjust to a bus-relative address - */ + * 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) { + * 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) + agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) break; } - if (!agpmem) goto vm_nopage_error; + if (!agpmem) + goto vm_nopage_error; /* - * Get the page, inc the use count, and return it - */ + * Get the page, inc the use count, and return it + */ offset = (baddr - agpmem->bound) >> PAGE_SHIFT; page = virt_to_page(__va(agpmem->memory->memory[offset])); get_page(page); - DRM_DEBUG("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n", - baddr, __va(agpmem->memory->memory[offset]), offset, - page_count(page)); + DRM_DEBUG + ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n", + baddr, __va(agpmem->memory->memory[offset]), offset, + page_count(page)); return page; - } -vm_nopage_error: - return NOPAGE_SIGBUS; /* Disallow mremap */ + } + vm_nopage_error: + return NOPAGE_SIGBUS; /* Disallow mremap */ } -#else /* __OS_HAS_AGP */ +#else /* __OS_HAS_AGP */ static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, - unsigned long address) + unsigned long address) { return NOPAGE_SIGBUS; } -#endif /* __OS_HAS_AGP */ +#endif /* __OS_HAS_AGP */ /** * \c nopage method for shared virtual memory. @@ -131,22 +135,24 @@ static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, * \param vma virtual memory area. * \param address access address. * \return pointer to the page structure. - * + * * Get the the mapping, find the real physical page to map, get the page, and * return it. */ static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma, - unsigned long address) + unsigned long address) { - drm_map_t *map = (drm_map_t *)vma->vm_private_data; - unsigned long offset; - unsigned long i; - struct page *page; + drm_map_t *map = (drm_map_t *) vma->vm_private_data; + unsigned long offset; + unsigned long i; + struct page *page; - if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */ - if (!map) return NOPAGE_OOM; /* Nothing allocated */ + if (address > vma->vm_end) + return NOPAGE_SIGBUS; /* Disallow mremap */ + if (!map) + return NOPAGE_OOM; /* Nothing allocated */ - offset = address - vma->vm_start; + offset = address - vma->vm_start; i = (unsigned long)map->handle + offset; page = (map->type == _DRM_CONSISTENT) ? virt_to_page((void *)i) : vmalloc_to_page((void *)i); @@ -158,19 +164,18 @@ static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma, return page; } - /** * \c close method for shared virtual memory. - * + * * \param vma virtual memory area. - * + * * Deletes map information if we are the last * person to close a mapping and it's not in the global maplist. */ static void drm_vm_shm_close(struct vm_area_struct *vma) { - drm_file_t *priv = vma->vm_file->private_data; - drm_device_t *dev = priv->head->dev; + drm_file_t *priv = vma->vm_file->private_data; + drm_device_t *dev = priv->head->dev; drm_vma_entry_t *pt, *prev, *next; drm_map_t *map; drm_map_list_t *r_list; @@ -186,7 +191,8 @@ static void drm_vm_shm_close(struct vm_area_struct *vma) down(&dev->struct_sem); for (pt = dev->vmalist, prev = NULL; pt; pt = next) { next = pt->next; - if (pt->vma->vm_private_data == map) found_maps++; + if (pt->vma->vm_private_data == map) + found_maps++; if (pt->vma == vma) { if (prev) { prev->next = pt->next; @@ -199,8 +205,7 @@ static void drm_vm_shm_close(struct vm_area_struct *vma) } } /* We were the only map that was found */ - if(found_maps == 1 && - map->flags & _DRM_REMOVABLE) { + 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. */ @@ -208,10 +213,11 @@ static void drm_vm_shm_close(struct vm_area_struct *vma) list = &dev->maplist->head; list_for_each(list, &dev->maplist->head) { r_list = list_entry(list, drm_map_list_t, head); - if (r_list->map == map) found_maps++; + if (r_list->map == map) + found_maps++; } - if(!found_maps) { + if (!found_maps) { drm_dma_handle_t dmah; switch (map->type) { @@ -251,27 +257,29 @@ static void drm_vm_shm_close(struct vm_area_struct *vma) * \param vma virtual memory area. * \param address access address. * \return pointer to the page structure. - * + * * Determine the page number from the page offset and get it from drm_device_dma::pagelist. */ static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma, - unsigned long address) + unsigned long address) { - drm_file_t *priv = vma->vm_file->private_data; - drm_device_t *dev = priv->head->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)))); + drm_file_t *priv = vma->vm_file->private_data; + drm_device_t *dev = priv->head->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); @@ -285,13 +293,13 @@ static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma, * \param vma virtual memory area. * \param address access address. * \return pointer to the page structure. - * + * * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. */ static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma, - unsigned long address) + unsigned long address) { - drm_map_t *map = (drm_map_t *)vma->vm_private_data; + drm_map_t *map = (drm_map_t *) vma->vm_private_data; drm_file_t *priv = vma->vm_file->private_data; drm_device_t *dev = priv->head->dev; drm_sg_mem_t *entry = dev->sg; @@ -300,10 +308,12 @@ static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma, 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 */ - + 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 - (unsigned long)dev->sg->virtual; @@ -314,76 +324,78 @@ static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma, return page; } - static struct page *drm_vm_nopage(struct vm_area_struct *vma, - unsigned long address, - int *type) { - if (type) *type = VM_FAULT_MINOR; + unsigned long address, int *type) +{ + if (type) + *type = VM_FAULT_MINOR; return drm_do_vm_nopage(vma, address); } static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma, - unsigned long address, - int *type) { - if (type) *type = VM_FAULT_MINOR; + unsigned long address, int *type) +{ + if (type) + *type = VM_FAULT_MINOR; return drm_do_vm_shm_nopage(vma, address); } static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma, - unsigned long address, - int *type) { - if (type) *type = VM_FAULT_MINOR; + unsigned long address, int *type) +{ + if (type) + *type = VM_FAULT_MINOR; return drm_do_vm_dma_nopage(vma, address); } static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma, - unsigned long address, - int *type) { - if (type) *type = VM_FAULT_MINOR; + unsigned long address, int *type) +{ + if (type) + *type = VM_FAULT_MINOR; return drm_do_vm_sg_nopage(vma, address); } /** AGP virtual memory operations */ -static struct vm_operations_struct drm_vm_ops = { +static struct vm_operations_struct drm_vm_ops = { .nopage = drm_vm_nopage, - .open = drm_vm_open, - .close = drm_vm_close, + .open = drm_vm_open, + .close = drm_vm_close, }; /** Shared virtual memory operations */ -static struct vm_operations_struct drm_vm_shm_ops = { +static struct vm_operations_struct drm_vm_shm_ops = { .nopage = drm_vm_shm_nopage, - .open = drm_vm_open, - .close = drm_vm_shm_close, + .open = drm_vm_open, + .close = drm_vm_shm_close, }; /** DMA virtual memory operations */ -static struct vm_operations_struct drm_vm_dma_ops = { +static struct vm_operations_struct drm_vm_dma_ops = { .nopage = drm_vm_dma_nopage, - .open = drm_vm_open, - .close = drm_vm_close, + .open = drm_vm_open, + .close = drm_vm_close, }; /** Scatter-gather virtual memory operations */ -static struct vm_operations_struct drm_vm_sg_ops = { +static struct vm_operations_struct drm_vm_sg_ops = { .nopage = drm_vm_sg_nopage, - .open = drm_vm_open, - .close = drm_vm_close, + .open = drm_vm_open, + .close = drm_vm_close, }; - /** * \c open method for shared virtual memory. - * + * * \param vma virtual memory area. - * + * * Create a new drm_vma_entry structure as the \p vma private data entry and * add it to drm_device::vmalist. */ static void drm_vm_open(struct vm_area_struct *vma) { - drm_file_t *priv = vma->vm_file->private_data; - drm_device_t *dev = priv->head->dev; + drm_file_t *priv = vma->vm_file->private_data; + drm_device_t *dev = priv->head->dev; drm_vma_entry_t *vma_entry; DRM_DEBUG("0x%08lx,0x%08lx\n", @@ -393,26 +405,26 @@ static void drm_vm_open(struct vm_area_struct *vma) vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS); if (vma_entry) { down(&dev->struct_sem); - vma_entry->vma = vma; + vma_entry->vma = vma; vma_entry->next = dev->vmalist; - vma_entry->pid = current->pid; - dev->vmalist = vma_entry; + vma_entry->pid = current->pid; + dev->vmalist = vma_entry; up(&dev->struct_sem); } } /** * \c close method for all virtual memory types. - * + * * \param vma virtual memory area. - * + * * Search the \p vma private data entry in drm_device::vmalist, unlink it, and * free it. */ static void drm_vm_close(struct vm_area_struct *vma) { - drm_file_t *priv = vma->vm_file->private_data; - drm_device_t *dev = priv->head->dev; + drm_file_t *priv = vma->vm_file->private_data; + drm_device_t *dev = priv->head->dev; drm_vma_entry_t *pt, *prev; DRM_DEBUG("0x%08lx,0x%08lx\n", @@ -440,43 +452,44 @@ static void drm_vm_close(struct vm_area_struct *vma) * \param filp file pointer. * \param vma virtual memory area. * \return zero on success or a negative number on failure. - * + * * Sets the virtual memory area operations structure to vm_dma_ops, the file * pointer, and calls vm_open(). */ static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) { - drm_file_t *priv = filp->private_data; - drm_device_t *dev; + 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; + unsigned long length = vma->vm_end - vma->vm_start; lock_kernel(); - dev = priv->head->dev; - dma = dev->dma; + dev = priv->head->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 */ + /* 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_ops = &drm_vm_dma_ops; - vma->vm_flags |= VM_RESERVED; /* Don't swap */ + vma->vm_flags |= VM_RESERVED; /* Don't swap */ - vma->vm_file = filp; /* Needed for drm_vm_open() */ + vma->vm_file = filp; /* Needed for drm_vm_open() */ drm_vm_open(vma); return 0; } -unsigned long drm_core_get_map_ofs(drm_map_t *map) +unsigned long drm_core_get_map_ofs(drm_map_t * map) { return map->offset; } + EXPORT_SYMBOL(drm_core_get_map_ofs); unsigned long drm_core_get_reg_ofs(struct drm_device *dev) @@ -487,6 +500,7 @@ unsigned long drm_core_get_reg_ofs(struct drm_device *dev) return 0; #endif } + EXPORT_SYMBOL(drm_core_get_reg_ofs); /** @@ -495,7 +509,7 @@ EXPORT_SYMBOL(drm_core_get_reg_ofs); * \param filp file pointer. * \param vma virtual memory area. * \return zero on success or a negative number on failure. - * + * * If the virtual memory area has no offset associated with it then it's a DMA * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, * checks that the restricted flag is not set, sets the virtual memory operations @@ -504,17 +518,18 @@ EXPORT_SYMBOL(drm_core_get_reg_ofs); */ int drm_mmap(struct file *filp, struct vm_area_struct *vma) { - drm_file_t *priv = filp->private_data; - drm_device_t *dev = priv->head->dev; - drm_map_t *map = NULL; - drm_map_list_t *r_list; - unsigned long offset = 0; + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->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 (!priv->authenticated) + return -EACCES; /* We check for "dma". On Apple's UniNorth, it's valid to have * the AGP mapped at physical address 0 @@ -522,61 +537,66 @@ int drm_mmap(struct file *filp, struct vm_area_struct *vma) */ if (!VM_OFFSET(vma) #if __OS_HAS_AGP - && (!dev->agp || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) + && (!dev->agp + || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) #endif ) 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. */ + /* 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) { r_list = list_entry(list, drm_map_list_t, head); map = r_list->map; - if (!map) continue; + if (!map) + continue; if (r_list->user_token == VM_OFFSET(vma)) break; } - if (!map || ((map->flags&_DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) + 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; + /* 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_WRITE | VM_MAYWRITE); #if defined(__i386__) || defined(__x86_64__) 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))))); + /* 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 (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) { - /* - * On some platforms 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() - */ + case _DRM_AGP: + if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) { + /* + * On some platforms 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() + */ #if defined(__powerpc__) - pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; + pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; #endif - vma->vm_ops = &drm_vm_ops; - break; - } - /* fall through to _DRM_FRAME_BUFFER... */ + vma->vm_ops = &drm_vm_ops; + break; + } + /* fall through to _DRM_FRAME_BUFFER... */ case _DRM_FRAME_BUFFER: case _DRM_REGISTERS: #if defined(__i386__) || defined(__x86_64__) @@ -591,27 +611,25 @@ int drm_mmap(struct file *filp, struct vm_area_struct *vma) #endif vma->vm_flags |= VM_IO; /* not in core dump */ #if defined(__ia64__) - if (efi_range_is_wc(vma->vm_start, vma->vm_end - - vma->vm_start)) + if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start)) vma->vm_page_prot = - pgprot_writecombine(vma->vm_page_prot); + pgprot_writecombine(vma->vm_page_prot); else - vma->vm_page_prot = - pgprot_noncached(vma->vm_page_prot); + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); #endif offset = dev->driver->get_reg_ofs(dev); #ifdef __sparc__ if (io_remap_pfn_range(DRM_RPR_ARG(vma) vma->vm_start, - (map->offset + offset) >> PAGE_SHIFT, - vma->vm_end - vma->vm_start, - vma->vm_page_prot)) + (map->offset + offset) >> PAGE_SHIFT, + vma->vm_end - vma->vm_start, + vma->vm_page_prot)) #else if (io_remap_pfn_range(vma, vma->vm_start, - (map->offset + offset) >> PAGE_SHIFT, - vma->vm_end - vma->vm_start, - vma->vm_page_prot)) + (map->offset + offset) >> PAGE_SHIFT, + vma->vm_end - vma->vm_start, + vma->vm_page_prot)) #endif - return -EAGAIN; + return -EAGAIN; DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," " offset = 0x%lx\n", map->type, @@ -624,22 +642,23 @@ int drm_mmap(struct file *filp, struct vm_area_struct *vma) * allocate in a different way */ vma->vm_ops = &drm_vm_shm_ops; vma->vm_private_data = (void *)map; - /* Don't let this area swap. Change when - DRM_KERNEL advisory is supported. */ + /* 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; vma->vm_private_data = (void *)map; vma->vm_flags |= VM_RESERVED; - break; + break; default: return -EINVAL; /* This should never happen. */ } - vma->vm_flags |= VM_RESERVED; /* Don't swap */ + vma->vm_flags |= VM_RESERVED; /* Don't swap */ - vma->vm_file = filp; /* Needed for drm_vm_open() */ + vma->vm_file = filp; /* Needed for drm_vm_open() */ drm_vm_open(vma); return 0; } + EXPORT_SYMBOL(drm_mmap); |
