| /** |
| * \file drm_vm.c |
| * Memory mapping for DRM |
| * |
| * \author Rickard E. (Rik) Faith <faith@valinux.com> |
| * \author Gareth Hughes <gareth@valinux.com> |
| */ |
| |
| /* |
| * 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. |
| */ |
| |
| #include "drmP.h" |
| #if defined(__ia64__) |
| #include <linux/efi.h> |
| #endif |
| |
| static void drm_vm_open(struct vm_area_struct *vma); |
| static void drm_vm_close(struct vm_area_struct *vma); |
| |
| static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma) |
| { |
| pgprot_t tmp = vm_get_page_prot(vma->vm_flags); |
| |
| #if defined(__i386__) || defined(__x86_64__) |
| if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) { |
| pgprot_val(tmp) |= _PAGE_PCD; |
| pgprot_val(tmp) &= ~_PAGE_PWT; |
| } |
| #elif defined(__powerpc__) |
| pgprot_val(tmp) |= _PAGE_NO_CACHE; |
| if (map_type == _DRM_REGISTERS) |
| pgprot_val(tmp) |= _PAGE_GUARDED; |
| #elif defined(__ia64__) |
| if (efi_range_is_wc(vma->vm_start, vma->vm_end - |
| vma->vm_start)) |
| tmp = pgprot_writecombine(tmp); |
| else |
| tmp = pgprot_noncached(tmp); |
| #elif defined(__sparc__) |
| tmp = pgprot_noncached(tmp); |
| #endif |
| return tmp; |
| } |
| |
| static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma) |
| { |
| pgprot_t tmp = vm_get_page_prot(vma->vm_flags); |
| |
| #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) |
| tmp |= _PAGE_NO_CACHE; |
| #endif |
| return tmp; |
| } |
| |
| /** |
| * \c fault method for AGP virtual memory. |
| * |
| * \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 int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| struct drm_file *priv = vma->vm_file->private_data; |
| struct drm_device *dev = priv->minor->dev; |
| struct drm_local_map *map = NULL; |
| struct drm_map_list *r_list; |
| struct drm_hash_item *hash; |
| |
| /* |
| * Find the right map |
| */ |
| if (!drm_core_has_AGP(dev)) |
| goto vm_fault_error; |
| |
| if (!dev->agp || !dev->agp->cant_use_aperture) |
| goto vm_fault_error; |
| |
| if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) |
| goto vm_fault_error; |
| |
| r_list = drm_hash_entry(hash, struct drm_map_list, hash); |
| map = r_list->map; |
| |
| if (map && map->type == _DRM_AGP) { |
| /* |
| * Using vm_pgoff as a selector forces us to use this unusual |
| * addressing scheme. |
| */ |
| unsigned long offset = (unsigned long)vmf->virtual_address - |
| vma->vm_start; |
| unsigned long baddr = map->offset + offset; |
| struct drm_agp_mem *agpmem; |
| struct page *page; |
| |
| #ifdef __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 |
| */ |
| list_for_each_entry(agpmem, &dev->agp->memory, head) { |
| if (agpmem->bound <= baddr && |
| agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) |
| break; |
| } |
| |
| if (!agpmem) |
| goto vm_fault_error; |
| |
| /* |
| * 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); |
| vmf->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)); |
| return 0; |
| } |
| vm_fault_error: |
| return VM_FAULT_SIGBUS; /* Disallow mremap */ |
| } |
| #else /* __OS_HAS_AGP */ |
| static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| return VM_FAULT_SIGBUS; |
| } |
| #endif /* __OS_HAS_AGP */ |
| |
| /** |
| * \c nopage method for shared virtual memory. |
| * |
| * \param vma virtual memory area. |
| * \param address access address. |
| * \return pointer to the page structure. |
| * |
| * Get the mapping, find the real physical page to map, get the page, and |
| * return it. |
| */ |
| static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| struct drm_local_map *map = vma->vm_private_data; |
| unsigned long offset; |
| unsigned long i; |
| struct page *page; |
| |
| if (!map) |
| return VM_FAULT_SIGBUS; /* Nothing allocated */ |
| |
| offset = (unsigned long)vmf->virtual_address - vma->vm_start; |
| i = (unsigned long)map->handle + offset; |
| page = vmalloc_to_page((void *)i); |
| if (!page) |
| return VM_FAULT_SIGBUS; |
| get_page(page); |
| vmf->page = page; |
| |
| DRM_DEBUG("shm_fault 0x%lx\n", offset); |
| return 0; |
| } |
| |
| /** |
| * \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) |
| { |
| struct drm_file *priv = vma->vm_file->private_data; |
| struct drm_device *dev = priv->minor->dev; |
| struct drm_vma_entry *pt, *temp; |
| struct drm_local_map *map; |
| struct drm_map_list *r_list; |
| int found_maps = 0; |
| |
| DRM_DEBUG("0x%08lx,0x%08lx\n", |
| vma->vm_start, vma->vm_end - vma->vm_start); |
| atomic_dec(&dev->vma_count); |
| |
| map = vma->vm_private_data; |
| |
| mutex_lock(&dev->struct_mutex); |
| list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
| if (pt->vma->vm_private_data == map) |
| found_maps++; |
| if (pt->vma == vma) { |
| list_del(&pt->head); |
| drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); |
| } |
| } |
| |
| /* 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_for_each_entry(r_list, &dev->maplist, head) { |
| if (r_list->map == map) |
| found_maps++; |
| } |
| |
| if (!found_maps) { |
| drm_dma_handle_t dmah; |
| |
| switch (map->type) { |
| case _DRM_REGISTERS: |
| case _DRM_FRAME_BUFFER: |
| if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { |
| int retcode; |
| retcode = mtrr_del(map->mtrr, |
| map->offset, |
| map->size); |
| DRM_DEBUG("mtrr_del = %d\n", retcode); |
| } |
| iounmap(map->handle); |
| break; |
| case _DRM_SHM: |
| vfree(map->handle); |
| break; |
| case _DRM_AGP: |
| case _DRM_SCATTER_GATHER: |
| break; |
| case _DRM_CONSISTENT: |
| dmah.vaddr = map->handle; |
| dmah.busaddr = map->offset; |
| dmah.size = map->size; |
| __drm_pci_free(dev, &dmah); |
| break; |
| case _DRM_GEM: |
| DRM_ERROR("tried to rmmap GEM object\n"); |
| break; |
| } |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| } |
| } |
| mutex_unlock(&dev->struct_mutex); |
| } |
| |
| /** |
| * \c fault method for DMA virtual memory. |
| * |
| * \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 int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| struct drm_file *priv = vma->vm_file->private_data; |
| struct drm_device *dev = priv->minor->dev; |
| struct drm_device_dma *dma = dev->dma; |
| unsigned long offset; |
| unsigned long page_nr; |
| struct page *page; |
| |
| if (!dma) |
| return VM_FAULT_SIGBUS; /* Error */ |
| if (!dma->pagelist) |
| return VM_FAULT_SIGBUS; /* Nothing allocated */ |
| |
| offset = (unsigned long)vmf->virtual_address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ |
| page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */ |
| page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK)))); |
| |
| get_page(page); |
| vmf->page = page; |
| |
| DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr); |
| return 0; |
| } |
| |
| /** |
| * \c fault method for scatter-gather virtual memory. |
| * |
| * \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 int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| struct drm_local_map *map = vma->vm_private_data; |
| struct drm_file *priv = vma->vm_file->private_data; |
| struct drm_device *dev = priv->minor->dev; |
| struct drm_sg_mem *entry = dev->sg; |
| unsigned long offset; |
| unsigned long map_offset; |
| unsigned long page_offset; |
| struct page *page; |
| |
| if (!entry) |
| return VM_FAULT_SIGBUS; /* Error */ |
| if (!entry->pagelist) |
| return VM_FAULT_SIGBUS; /* Nothing allocated */ |
| |
| offset = (unsigned long)vmf->virtual_address - vma->vm_start; |
| map_offset = map->offset - (unsigned long)dev->sg->virtual; |
| page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); |
| page = entry->pagelist[page_offset]; |
| get_page(page); |
| vmf->page = page; |
| |
| return 0; |
| } |
| |
| static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| return drm_do_vm_fault(vma, vmf); |
| } |
| |
| static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| return drm_do_vm_shm_fault(vma, vmf); |
| } |
| |
| static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| return drm_do_vm_dma_fault(vma, vmf); |
| } |
| |
| static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| return drm_do_vm_sg_fault(vma, vmf); |
| } |
| |
| /** AGP virtual memory operations */ |
| static struct vm_operations_struct drm_vm_ops = { |
| .fault = drm_vm_fault, |
| .open = drm_vm_open, |
| .close = drm_vm_close, |
| }; |
| |
| /** Shared virtual memory operations */ |
| static struct vm_operations_struct drm_vm_shm_ops = { |
| .fault = drm_vm_shm_fault, |
| .open = drm_vm_open, |
| .close = drm_vm_shm_close, |
| }; |
| |
| /** DMA virtual memory operations */ |
| static struct vm_operations_struct drm_vm_dma_ops = { |
| .fault = drm_vm_dma_fault, |
| .open = drm_vm_open, |
| .close = drm_vm_close, |
| }; |
| |
| /** Scatter-gather virtual memory operations */ |
| static struct vm_operations_struct drm_vm_sg_ops = { |
| .fault = drm_vm_sg_fault, |
| .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. |
| */ |
| void drm_vm_open_locked(struct vm_area_struct *vma) |
| { |
| struct drm_file *priv = vma->vm_file->private_data; |
| struct drm_device *dev = priv->minor->dev; |
| struct drm_vma_entry *vma_entry; |
| |
| DRM_DEBUG("0x%08lx,0x%08lx\n", |
| vma->vm_start, vma->vm_end - vma->vm_start); |
| atomic_inc(&dev->vma_count); |
| |
| vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS); |
| if (vma_entry) { |
| vma_entry->vma = vma; |
| vma_entry->pid = current->pid; |
| list_add(&vma_entry->head, &dev->vmalist); |
| } |
| } |
| |
| static void drm_vm_open(struct vm_area_struct *vma) |
| { |
| struct drm_file *priv = vma->vm_file->private_data; |
| struct drm_device *dev = priv->minor->dev; |
| |
| mutex_lock(&dev->struct_mutex); |
| drm_vm_open_locked(vma); |
| mutex_unlock(&dev->struct_mutex); |
| } |
| |
| /** |
| * \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) |
| { |
| struct drm_file *priv = vma->vm_file->private_data; |
| struct drm_device *dev = priv->minor->dev; |
| struct drm_vma_entry *pt, *temp; |
| |
| DRM_DEBUG("0x%08lx,0x%08lx\n", |
| vma->vm_start, vma->vm_end - vma->vm_start); |
| atomic_dec(&dev->vma_count); |
| |
| mutex_lock(&dev->struct_mutex); |
| list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
| if (pt->vma == vma) { |
| list_del(&pt->head); |
| drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); |
| break; |
| } |
| } |
| mutex_unlock(&dev->struct_mutex); |
| } |
| |
| /** |
| * mmap DMA memory. |
| * |
| * \param file_priv DRM file private. |
| * \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) |
| { |
| struct drm_file *priv = filp->private_data; |
| struct drm_device *dev; |
| struct drm_device_dma *dma; |
| unsigned long length = vma->vm_end - vma->vm_start; |
| |
| dev = priv->minor->dev; |
| dma = dev->dma; |
| DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
| vma->vm_start, vma->vm_end, vma->vm_pgoff); |
| |
| /* Length must match exact page count */ |
| if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { |
| return -EINVAL; |
| } |
| |
| if (!capable(CAP_SYS_ADMIN) && |
| (dma->flags & _DRM_DMA_USE_PCI_RO)) { |
| 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))))); |
| #endif |
| } |
| |
| vma->vm_ops = &drm_vm_dma_ops; |
| |
| vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
| vma->vm_flags |= VM_DONTEXPAND; |
| |
| vma->vm_file = filp; /* Needed for drm_vm_open() */ |
| drm_vm_open_locked(vma); |
| return 0; |
| } |
| |
| unsigned long drm_core_get_map_ofs(struct drm_local_map * map) |
| { |
| return map->offset; |
| } |
| |
| EXPORT_SYMBOL(drm_core_get_map_ofs); |
| |
| unsigned long drm_core_get_reg_ofs(struct drm_device *dev) |
| { |
| #ifdef __alpha__ |
| return dev->hose->dense_mem_base - dev->hose->mem_space->start; |
| #else |
| return 0; |
| #endif |
| } |
| |
| EXPORT_SYMBOL(drm_core_get_reg_ofs); |
| |
| /** |
| * mmap DMA memory. |
| * |
| * \param file_priv DRM file private. |
| * \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 |
| * according to the mapping type and remaps the pages. Finally sets the file |
| * pointer and calls vm_open(). |
| */ |
| int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) |
| { |
| struct drm_file *priv = filp->private_data; |
| struct drm_device *dev = priv->minor->dev; |
| struct drm_local_map *map = NULL; |
| unsigned long offset = 0; |
| struct drm_hash_item *hash; |
| |
| DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
| vma->vm_start, vma->vm_end, vma->vm_pgoff); |
| |
| 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 |
| * --BenH. |
| */ |
| if (!vma->vm_pgoff |
| #if __OS_HAS_AGP |
| && (!dev->agp |
| || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) |
| #endif |
| ) |
| return drm_mmap_dma(filp, vma); |
| |
| if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { |
| DRM_ERROR("Could not find map\n"); |
| return -EINVAL; |
| } |
| |
| map = drm_hash_entry(hash, struct drm_map_list, hash)->map; |
| 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_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))))); |
| #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 fault() |
| */ |
| #if defined(__powerpc__) |
| pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; |
| #endif |
| vma->vm_ops = &drm_vm_ops; |
| break; |
| } |
| /* fall through to _DRM_FRAME_BUFFER... */ |
| case _DRM_FRAME_BUFFER: |
| case _DRM_REGISTERS: |
| offset = dev->driver->get_reg_ofs(dev); |
| vma->vm_flags |= VM_IO; /* not in core dump */ |
| vma->vm_page_prot = drm_io_prot(map->type, vma); |
| if (io_remap_pfn_range(vma, vma->vm_start, |
| (map->offset + offset) >> PAGE_SHIFT, |
| 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, map->offset + offset); |
| vma->vm_ops = &drm_vm_ops; |
| break; |
| case _DRM_CONSISTENT: |
| /* Consistent memory is really like shared memory. But |
| * it's allocated in a different way, so avoid fault */ |
| if (remap_pfn_range(vma, vma->vm_start, |
| page_to_pfn(virt_to_page(map->handle)), |
| vma->vm_end - vma->vm_start, vma->vm_page_prot)) |
| return -EAGAIN; |
| vma->vm_page_prot = drm_dma_prot(map->type, vma); |
| /* fall through to _DRM_SHM */ |
| case _DRM_SHM: |
| 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. */ |
| 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; |
| vma->vm_page_prot = drm_dma_prot(map->type, vma); |
| break; |
| default: |
| return -EINVAL; /* This should never happen. */ |
| } |
| vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
| vma->vm_flags |= VM_DONTEXPAND; |
| |
| vma->vm_file = filp; /* Needed for drm_vm_open() */ |
| drm_vm_open_locked(vma); |
| return 0; |
| } |
| |
| int drm_mmap(struct file *filp, struct vm_area_struct *vma) |
| { |
| struct drm_file *priv = filp->private_data; |
| struct drm_device *dev = priv->minor->dev; |
| int ret; |
| |
| mutex_lock(&dev->struct_mutex); |
| ret = drm_mmap_locked(filp, vma); |
| mutex_unlock(&dev->struct_mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_mmap); |