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665 lines
17 KiB
665 lines
17 KiB
/* |
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* \file drm_vm.c |
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* Memory mapping for DRM |
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* |
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* \author Rickard E. (Rik) Faith <[email protected]> |
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* \author Gareth Hughes <[email protected]> |
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*/ |
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|
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/* |
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* Created: Mon Jan 4 08:58:31 1999 by [email protected] |
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* |
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. |
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
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* All Rights Reserved. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a |
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* copy of this software and associated documentation files (the "Software"), |
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* to deal in the Software without restriction, including without limitation |
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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* and/or sell copies of the Software, and to permit persons to whom the |
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* Software is furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice (including the next |
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* paragraph) shall be included in all copies or substantial portions of the |
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* Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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* OTHER DEALINGS IN THE SOFTWARE. |
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*/ |
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|
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#include <linux/export.h> |
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#include <linux/pci.h> |
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#include <linux/seq_file.h> |
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#include <linux/vmalloc.h> |
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#include <linux/pgtable.h> |
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|
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#if defined(__ia64__) |
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#include <linux/efi.h> |
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#include <linux/slab.h> |
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#endif |
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#include <linux/mem_encrypt.h> |
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|
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#include <drm/drm_device.h> |
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#include <drm/drm_drv.h> |
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#include <drm/drm_file.h> |
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#include <drm/drm_framebuffer.h> |
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#include <drm/drm_print.h> |
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|
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#include "drm_internal.h" |
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#include "drm_legacy.h" |
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|
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struct drm_vma_entry { |
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struct list_head head; |
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struct vm_area_struct *vma; |
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pid_t pid; |
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}; |
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|
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static void drm_vm_open(struct vm_area_struct *vma); |
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static void drm_vm_close(struct vm_area_struct *vma); |
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|
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static pgprot_t drm_io_prot(struct drm_local_map *map, |
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struct vm_area_struct *vma) |
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{ |
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pgprot_t tmp = vm_get_page_prot(vma->vm_flags); |
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|
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#if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) || \ |
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defined(__mips__) |
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if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING)) |
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tmp = pgprot_noncached(tmp); |
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else |
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tmp = pgprot_writecombine(tmp); |
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#elif defined(__ia64__) |
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if (efi_range_is_wc(vma->vm_start, vma->vm_end - |
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vma->vm_start)) |
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tmp = pgprot_writecombine(tmp); |
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else |
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tmp = pgprot_noncached(tmp); |
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#elif defined(__sparc__) || defined(__arm__) |
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tmp = pgprot_noncached(tmp); |
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#endif |
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return tmp; |
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} |
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|
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static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma) |
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{ |
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pgprot_t tmp = vm_get_page_prot(vma->vm_flags); |
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|
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#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) |
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tmp = pgprot_noncached_wc(tmp); |
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#endif |
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return tmp; |
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} |
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|
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/* |
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* \c fault method for AGP virtual memory. |
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* |
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* \param vma virtual memory area. |
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* \param address access address. |
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* \return pointer to the page structure. |
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* |
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* Find the right map and if it's AGP memory find the real physical page to |
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* map, get the page, increment the use count and return it. |
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*/ |
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#if IS_ENABLED(CONFIG_AGP) |
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static vm_fault_t drm_vm_fault(struct vm_fault *vmf) |
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{ |
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struct vm_area_struct *vma = vmf->vma; |
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struct drm_file *priv = vma->vm_file->private_data; |
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struct drm_device *dev = priv->minor->dev; |
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struct drm_local_map *map = NULL; |
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struct drm_map_list *r_list; |
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struct drm_hash_item *hash; |
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|
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/* |
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* Find the right map |
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*/ |
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if (!dev->agp) |
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goto vm_fault_error; |
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|
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if (!dev->agp || !dev->agp->cant_use_aperture) |
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goto vm_fault_error; |
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if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) |
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goto vm_fault_error; |
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r_list = drm_hash_entry(hash, struct drm_map_list, hash); |
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map = r_list->map; |
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|
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if (map && map->type == _DRM_AGP) { |
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/* |
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* Using vm_pgoff as a selector forces us to use this unusual |
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* addressing scheme. |
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*/ |
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resource_size_t offset = vmf->address - vma->vm_start; |
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resource_size_t baddr = map->offset + offset; |
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struct drm_agp_mem *agpmem; |
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struct page *page; |
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|
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#ifdef __alpha__ |
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/* |
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* Adjust to a bus-relative address |
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*/ |
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baddr -= dev->hose->mem_space->start; |
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#endif |
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/* |
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* It's AGP memory - find the real physical page to map |
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*/ |
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list_for_each_entry(agpmem, &dev->agp->memory, head) { |
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if (agpmem->bound <= baddr && |
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agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) |
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break; |
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} |
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if (&agpmem->head == &dev->agp->memory) |
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goto vm_fault_error; |
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/* |
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* Get the page, inc the use count, and return it |
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*/ |
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offset = (baddr - agpmem->bound) >> PAGE_SHIFT; |
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page = agpmem->memory->pages[offset]; |
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get_page(page); |
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vmf->page = page; |
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DRM_DEBUG |
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("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n", |
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(unsigned long long)baddr, |
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agpmem->memory->pages[offset], |
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(unsigned long long)offset, |
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page_count(page)); |
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return 0; |
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} |
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vm_fault_error: |
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return VM_FAULT_SIGBUS; /* Disallow mremap */ |
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} |
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#else |
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static vm_fault_t drm_vm_fault(struct vm_fault *vmf) |
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{ |
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return VM_FAULT_SIGBUS; |
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} |
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#endif |
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/* |
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* \c nopage method for shared virtual memory. |
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* |
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* \param vma virtual memory area. |
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* \param address access address. |
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* \return pointer to the page structure. |
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* |
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* Get the mapping, find the real physical page to map, get the page, and |
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* return it. |
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*/ |
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static vm_fault_t drm_vm_shm_fault(struct vm_fault *vmf) |
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{ |
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struct vm_area_struct *vma = vmf->vma; |
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struct drm_local_map *map = vma->vm_private_data; |
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unsigned long offset; |
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unsigned long i; |
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struct page *page; |
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if (!map) |
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return VM_FAULT_SIGBUS; /* Nothing allocated */ |
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offset = vmf->address - vma->vm_start; |
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i = (unsigned long)map->handle + offset; |
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page = vmalloc_to_page((void *)i); |
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if (!page) |
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return VM_FAULT_SIGBUS; |
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get_page(page); |
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vmf->page = page; |
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DRM_DEBUG("shm_fault 0x%lx\n", offset); |
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return 0; |
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} |
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/* |
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* \c close method for shared virtual memory. |
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* |
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* \param vma virtual memory area. |
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* |
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* Deletes map information if we are the last |
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* person to close a mapping and it's not in the global maplist. |
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*/ |
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static void drm_vm_shm_close(struct vm_area_struct *vma) |
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{ |
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struct drm_file *priv = vma->vm_file->private_data; |
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struct drm_device *dev = priv->minor->dev; |
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struct drm_vma_entry *pt, *temp; |
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struct drm_local_map *map; |
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struct drm_map_list *r_list; |
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int found_maps = 0; |
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DRM_DEBUG("0x%08lx,0x%08lx\n", |
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vma->vm_start, vma->vm_end - vma->vm_start); |
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map = vma->vm_private_data; |
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mutex_lock(&dev->struct_mutex); |
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list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
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if (pt->vma->vm_private_data == map) |
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found_maps++; |
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if (pt->vma == vma) { |
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list_del(&pt->head); |
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kfree(pt); |
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} |
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} |
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/* We were the only map that was found */ |
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if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { |
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/* Check to see if we are in the maplist, if we are not, then |
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* we delete this mappings information. |
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*/ |
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found_maps = 0; |
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list_for_each_entry(r_list, &dev->maplist, head) { |
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if (r_list->map == map) |
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found_maps++; |
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} |
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if (!found_maps) { |
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switch (map->type) { |
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case _DRM_REGISTERS: |
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case _DRM_FRAME_BUFFER: |
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arch_phys_wc_del(map->mtrr); |
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iounmap(map->handle); |
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break; |
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case _DRM_SHM: |
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vfree(map->handle); |
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break; |
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case _DRM_AGP: |
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case _DRM_SCATTER_GATHER: |
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break; |
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case _DRM_CONSISTENT: |
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dma_free_coherent(dev->dev, |
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map->size, |
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map->handle, |
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map->offset); |
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break; |
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} |
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kfree(map); |
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} |
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} |
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mutex_unlock(&dev->struct_mutex); |
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} |
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/* |
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* \c fault method for DMA virtual memory. |
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* |
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* \param address access address. |
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* \return pointer to the page structure. |
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* |
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* Determine the page number from the page offset and get it from drm_device_dma::pagelist. |
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*/ |
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static vm_fault_t drm_vm_dma_fault(struct vm_fault *vmf) |
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{ |
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struct vm_area_struct *vma = vmf->vma; |
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struct drm_file *priv = vma->vm_file->private_data; |
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struct drm_device *dev = priv->minor->dev; |
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struct drm_device_dma *dma = dev->dma; |
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unsigned long offset; |
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unsigned long page_nr; |
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struct page *page; |
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if (!dma) |
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return VM_FAULT_SIGBUS; /* Error */ |
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if (!dma->pagelist) |
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return VM_FAULT_SIGBUS; /* Nothing allocated */ |
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offset = vmf->address - vma->vm_start; |
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/* vm_[pg]off[set] should be 0 */ |
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page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */ |
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page = virt_to_page((void *)dma->pagelist[page_nr]); |
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get_page(page); |
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vmf->page = page; |
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DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr); |
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return 0; |
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} |
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/* |
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* \c fault method for scatter-gather virtual memory. |
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* |
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* \param address access address. |
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* \return pointer to the page structure. |
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* |
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* Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. |
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*/ |
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static vm_fault_t drm_vm_sg_fault(struct vm_fault *vmf) |
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{ |
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struct vm_area_struct *vma = vmf->vma; |
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struct drm_local_map *map = vma->vm_private_data; |
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struct drm_file *priv = vma->vm_file->private_data; |
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struct drm_device *dev = priv->minor->dev; |
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struct drm_sg_mem *entry = dev->sg; |
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unsigned long offset; |
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unsigned long map_offset; |
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unsigned long page_offset; |
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struct page *page; |
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if (!entry) |
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return VM_FAULT_SIGBUS; /* Error */ |
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if (!entry->pagelist) |
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return VM_FAULT_SIGBUS; /* Nothing allocated */ |
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offset = vmf->address - vma->vm_start; |
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map_offset = map->offset - (unsigned long)dev->sg->virtual; |
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page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); |
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page = entry->pagelist[page_offset]; |
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get_page(page); |
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vmf->page = page; |
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return 0; |
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} |
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/** AGP virtual memory operations */ |
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static const struct vm_operations_struct drm_vm_ops = { |
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.fault = drm_vm_fault, |
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.open = drm_vm_open, |
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.close = drm_vm_close, |
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}; |
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|
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/** Shared virtual memory operations */ |
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static const struct vm_operations_struct drm_vm_shm_ops = { |
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.fault = drm_vm_shm_fault, |
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.open = drm_vm_open, |
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.close = drm_vm_shm_close, |
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}; |
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|
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/** DMA virtual memory operations */ |
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static const struct vm_operations_struct drm_vm_dma_ops = { |
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.fault = drm_vm_dma_fault, |
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.open = drm_vm_open, |
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.close = drm_vm_close, |
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}; |
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|
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/** Scatter-gather virtual memory operations */ |
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static const struct vm_operations_struct drm_vm_sg_ops = { |
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.fault = drm_vm_sg_fault, |
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.open = drm_vm_open, |
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.close = drm_vm_close, |
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}; |
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|
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static void drm_vm_open_locked(struct drm_device *dev, |
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struct vm_area_struct *vma) |
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{ |
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struct drm_vma_entry *vma_entry; |
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|
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DRM_DEBUG("0x%08lx,0x%08lx\n", |
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vma->vm_start, vma->vm_end - vma->vm_start); |
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|
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vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL); |
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if (vma_entry) { |
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vma_entry->vma = vma; |
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vma_entry->pid = current->pid; |
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list_add(&vma_entry->head, &dev->vmalist); |
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} |
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} |
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static void drm_vm_open(struct vm_area_struct *vma) |
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{ |
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struct drm_file *priv = vma->vm_file->private_data; |
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struct drm_device *dev = priv->minor->dev; |
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|
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mutex_lock(&dev->struct_mutex); |
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drm_vm_open_locked(dev, vma); |
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mutex_unlock(&dev->struct_mutex); |
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} |
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|
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static void drm_vm_close_locked(struct drm_device *dev, |
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struct vm_area_struct *vma) |
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{ |
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struct drm_vma_entry *pt, *temp; |
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DRM_DEBUG("0x%08lx,0x%08lx\n", |
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vma->vm_start, vma->vm_end - vma->vm_start); |
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|
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list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
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if (pt->vma == vma) { |
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list_del(&pt->head); |
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kfree(pt); |
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break; |
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} |
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} |
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} |
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|
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/* |
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* \c close method for all virtual memory types. |
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* |
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* \param vma virtual memory area. |
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* |
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* Search the \p vma private data entry in drm_device::vmalist, unlink it, and |
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* free it. |
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*/ |
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static void drm_vm_close(struct vm_area_struct *vma) |
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{ |
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struct drm_file *priv = vma->vm_file->private_data; |
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struct drm_device *dev = priv->minor->dev; |
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|
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mutex_lock(&dev->struct_mutex); |
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drm_vm_close_locked(dev, vma); |
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mutex_unlock(&dev->struct_mutex); |
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} |
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/* |
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* mmap DMA memory. |
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* |
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* \param file_priv DRM file private. |
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* \param vma virtual memory area. |
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* \return zero on success or a negative number on failure. |
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* |
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* Sets the virtual memory area operations structure to vm_dma_ops, the file |
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* pointer, and calls vm_open(). |
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*/ |
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static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) |
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{ |
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struct drm_file *priv = filp->private_data; |
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struct drm_device *dev; |
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struct drm_device_dma *dma; |
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unsigned long length = vma->vm_end - vma->vm_start; |
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|
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dev = priv->minor->dev; |
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dma = dev->dma; |
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DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
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vma->vm_start, vma->vm_end, vma->vm_pgoff); |
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|
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/* Length must match exact page count */ |
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if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { |
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return -EINVAL; |
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} |
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|
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if (!capable(CAP_SYS_ADMIN) && |
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(dma->flags & _DRM_DMA_USE_PCI_RO)) { |
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vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); |
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#if defined(__i386__) || defined(__x86_64__) |
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pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; |
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#else |
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/* Ye gads this is ugly. With more thought |
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we could move this up higher and use |
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`protection_map' instead. */ |
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vma->vm_page_prot = |
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__pgprot(pte_val |
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(pte_wrprotect |
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(__pte(pgprot_val(vma->vm_page_prot))))); |
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#endif |
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} |
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|
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vma->vm_ops = &drm_vm_dma_ops; |
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|
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vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
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|
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drm_vm_open_locked(dev, vma); |
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return 0; |
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} |
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static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev) |
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{ |
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#ifdef __alpha__ |
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return dev->hose->dense_mem_base; |
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#else |
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return 0; |
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#endif |
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} |
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|
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/* |
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* mmap DMA memory. |
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* |
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* \param file_priv DRM file private. |
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* \param vma virtual memory area. |
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* \return zero on success or a negative number on failure. |
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* |
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* If the virtual memory area has no offset associated with it then it's a DMA |
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* area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, |
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* checks that the restricted flag is not set, sets the virtual memory operations |
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* according to the mapping type and remaps the pages. Finally sets the file |
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* pointer and calls vm_open(). |
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*/ |
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static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) |
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{ |
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struct drm_file *priv = filp->private_data; |
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struct drm_device *dev = priv->minor->dev; |
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struct drm_local_map *map = NULL; |
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resource_size_t offset = 0; |
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struct drm_hash_item *hash; |
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|
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DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
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vma->vm_start, vma->vm_end, vma->vm_pgoff); |
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|
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if (!priv->authenticated) |
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return -EACCES; |
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|
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/* We check for "dma". On Apple's UniNorth, it's valid to have |
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* the AGP mapped at physical address 0 |
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* --BenH. |
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*/ |
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if (!vma->vm_pgoff |
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#if IS_ENABLED(CONFIG_AGP) |
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&& (!dev->agp |
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|| dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) |
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#endif |
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) |
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return drm_mmap_dma(filp, vma); |
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|
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if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { |
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DRM_ERROR("Could not find map\n"); |
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return -EINVAL; |
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} |
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|
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map = drm_hash_entry(hash, struct drm_map_list, hash)->map; |
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if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) |
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return -EPERM; |
|
|
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/* Check for valid size. */ |
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if (map->size < vma->vm_end - vma->vm_start) |
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return -EINVAL; |
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|
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if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { |
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vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); |
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#if defined(__i386__) || defined(__x86_64__) |
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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) { |
|
#if !defined(__arm__) |
|
case _DRM_AGP: |
|
if (dev->agp && 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__) |
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
|
#endif |
|
vma->vm_ops = &drm_vm_ops; |
|
break; |
|
} |
|
fallthrough; /* to _DRM_FRAME_BUFFER... */ |
|
#endif |
|
case _DRM_FRAME_BUFFER: |
|
case _DRM_REGISTERS: |
|
offset = drm_core_get_reg_ofs(dev); |
|
vma->vm_page_prot = drm_io_prot(map, 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%llx\n", |
|
map->type, |
|
vma->vm_start, vma->vm_end, (unsigned long long)(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); |
|
fallthrough; /* to _DRM_SHM */ |
|
case _DRM_SHM: |
|
vma->vm_ops = &drm_vm_shm_ops; |
|
vma->vm_private_data = (void *)map; |
|
break; |
|
case _DRM_SCATTER_GATHER: |
|
vma->vm_ops = &drm_vm_sg_ops; |
|
vma->vm_private_data = (void *)map; |
|
vma->vm_page_prot = drm_dma_prot(map->type, vma); |
|
break; |
|
default: |
|
return -EINVAL; /* This should never happen. */ |
|
} |
|
vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
|
|
|
drm_vm_open_locked(dev, vma); |
|
return 0; |
|
} |
|
|
|
int drm_legacy_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; |
|
|
|
if (drm_dev_is_unplugged(dev)) |
|
return -ENODEV; |
|
|
|
mutex_lock(&dev->struct_mutex); |
|
ret = drm_mmap_locked(filp, vma); |
|
mutex_unlock(&dev->struct_mutex); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(drm_legacy_mmap); |
|
|
|
#if IS_ENABLED(CONFIG_DRM_LEGACY) |
|
void drm_legacy_vma_flush(struct drm_device *dev) |
|
{ |
|
struct drm_vma_entry *vma, *vma_temp; |
|
|
|
/* Clear vma list (only needed for legacy drivers) */ |
|
list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { |
|
list_del(&vma->head); |
|
kfree(vma); |
|
} |
|
} |
|
#endif
|
|
|