Rob Clark | cd5351f | 2011-11-12 12:09:40 -0600 | [diff] [blame] | 1 | /* |
Rob Clark | 8bb0daf | 2013-02-11 12:43:09 -0500 | [diff] [blame] | 2 | * drivers/gpu/drm/omapdrm/omap_gem_helpers.c |
Rob Clark | cd5351f | 2011-11-12 12:09:40 -0600 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2011 Texas Instruments |
| 5 | * Author: Rob Clark <rob.clark@linaro.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License version 2 as published by |
| 9 | * the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 14 | * more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along with |
| 17 | * this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | /* temporary copy of drm_gem_{get,put}_pages() until the |
| 21 | * "drm/gem: add functions to get/put pages" patch is merged.. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/shmem_fs.h> |
| 27 | |
| 28 | #include <drm/drmP.h> |
| 29 | |
| 30 | /** |
| 31 | * drm_gem_get_pages - helper to allocate backing pages for a GEM object |
| 32 | * @obj: obj in question |
| 33 | * @gfpmask: gfp mask of requested pages |
| 34 | */ |
YAMANE Toshiaki | b1ca079 | 2012-11-14 19:40:29 +0900 | [diff] [blame] | 35 | struct page **_drm_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask) |
Rob Clark | cd5351f | 2011-11-12 12:09:40 -0600 | [diff] [blame] | 36 | { |
| 37 | struct inode *inode; |
| 38 | struct address_space *mapping; |
| 39 | struct page *p, **pages; |
| 40 | int i, npages; |
| 41 | |
| 42 | /* This is the shared memory object that backs the GEM resource */ |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 43 | inode = file_inode(obj->filp); |
Rob Clark | cd5351f | 2011-11-12 12:09:40 -0600 | [diff] [blame] | 44 | mapping = inode->i_mapping; |
| 45 | |
| 46 | npages = obj->size >> PAGE_SHIFT; |
| 47 | |
| 48 | pages = drm_malloc_ab(npages, sizeof(struct page *)); |
| 49 | if (pages == NULL) |
| 50 | return ERR_PTR(-ENOMEM); |
| 51 | |
| 52 | gfpmask |= mapping_gfp_mask(mapping); |
| 53 | |
| 54 | for (i = 0; i < npages; i++) { |
| 55 | p = shmem_read_mapping_page_gfp(mapping, i, gfpmask); |
| 56 | if (IS_ERR(p)) |
| 57 | goto fail; |
| 58 | pages[i] = p; |
| 59 | |
| 60 | /* There is a hypothetical issue w/ drivers that require |
| 61 | * buffer memory in the low 4GB.. if the pages are un- |
| 62 | * pinned, and swapped out, they can end up swapped back |
| 63 | * in above 4GB. If pages are already in memory, then |
| 64 | * shmem_read_mapping_page_gfp will ignore the gfpmask, |
| 65 | * even if the already in-memory page disobeys the mask. |
| 66 | * |
| 67 | * It is only a theoretical issue today, because none of |
| 68 | * the devices with this limitation can be populated with |
| 69 | * enough memory to trigger the issue. But this BUG_ON() |
| 70 | * is here as a reminder in case the problem with |
| 71 | * shmem_read_mapping_page_gfp() isn't solved by the time |
| 72 | * it does become a real issue. |
| 73 | * |
| 74 | * See this thread: http://lkml.org/lkml/2011/7/11/238 |
| 75 | */ |
| 76 | BUG_ON((gfpmask & __GFP_DMA32) && |
| 77 | (page_to_pfn(p) >= 0x00100000UL)); |
| 78 | } |
| 79 | |
| 80 | return pages; |
| 81 | |
| 82 | fail: |
YAMANE Toshiaki | 4a19313 | 2012-11-14 19:40:43 +0900 | [diff] [blame] | 83 | while (i--) |
Rob Clark | cd5351f | 2011-11-12 12:09:40 -0600 | [diff] [blame] | 84 | page_cache_release(pages[i]); |
YAMANE Toshiaki | 4a19313 | 2012-11-14 19:40:43 +0900 | [diff] [blame] | 85 | |
Rob Clark | cd5351f | 2011-11-12 12:09:40 -0600 | [diff] [blame] | 86 | drm_free_large(pages); |
Thomas Meyer | 37fe58b | 2012-01-22 18:27:21 +0100 | [diff] [blame] | 87 | return ERR_CAST(p); |
Rob Clark | cd5351f | 2011-11-12 12:09:40 -0600 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | /** |
| 91 | * drm_gem_put_pages - helper to free backing pages for a GEM object |
| 92 | * @obj: obj in question |
| 93 | * @pages: pages to free |
| 94 | */ |
| 95 | void _drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, |
| 96 | bool dirty, bool accessed) |
| 97 | { |
| 98 | int i, npages; |
| 99 | |
| 100 | npages = obj->size >> PAGE_SHIFT; |
| 101 | |
| 102 | for (i = 0; i < npages; i++) { |
| 103 | if (dirty) |
| 104 | set_page_dirty(pages[i]); |
| 105 | |
| 106 | if (accessed) |
| 107 | mark_page_accessed(pages[i]); |
| 108 | |
| 109 | /* Undo the reference we took when populating the table */ |
| 110 | page_cache_release(pages[i]); |
| 111 | } |
| 112 | |
| 113 | drm_free_large(pages); |
| 114 | } |
Rob Clark | f7f9f45 | 2011-12-05 19:19:22 -0600 | [diff] [blame] | 115 | |
| 116 | int |
| 117 | _drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size) |
| 118 | { |
| 119 | struct drm_device *dev = obj->dev; |
| 120 | struct drm_gem_mm *mm = dev->mm_private; |
| 121 | struct drm_map_list *list; |
| 122 | struct drm_local_map *map; |
| 123 | int ret = 0; |
| 124 | |
| 125 | /* Set the object up for mmap'ing */ |
| 126 | list = &obj->map_list; |
| 127 | list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL); |
| 128 | if (!list->map) |
| 129 | return -ENOMEM; |
| 130 | |
| 131 | map = list->map; |
| 132 | map->type = _DRM_GEM; |
| 133 | map->size = size; |
| 134 | map->handle = obj; |
| 135 | |
| 136 | /* Get a DRM GEM mmap offset allocated... */ |
| 137 | list->file_offset_node = drm_mm_search_free(&mm->offset_manager, |
| 138 | size / PAGE_SIZE, 0, 0); |
| 139 | |
| 140 | if (!list->file_offset_node) { |
| 141 | DRM_ERROR("failed to allocate offset for bo %d\n", obj->name); |
| 142 | ret = -ENOSPC; |
| 143 | goto out_free_list; |
| 144 | } |
| 145 | |
| 146 | list->file_offset_node = drm_mm_get_block(list->file_offset_node, |
| 147 | size / PAGE_SIZE, 0); |
| 148 | if (!list->file_offset_node) { |
| 149 | ret = -ENOMEM; |
| 150 | goto out_free_list; |
| 151 | } |
| 152 | |
| 153 | list->hash.key = list->file_offset_node->start; |
| 154 | ret = drm_ht_insert_item(&mm->offset_hash, &list->hash); |
| 155 | if (ret) { |
| 156 | DRM_ERROR("failed to add to map hash\n"); |
| 157 | goto out_free_mm; |
| 158 | } |
| 159 | |
| 160 | return 0; |
| 161 | |
| 162 | out_free_mm: |
| 163 | drm_mm_put_block(list->file_offset_node); |
| 164 | out_free_list: |
| 165 | kfree(list->map); |
| 166 | list->map = NULL; |
| 167 | |
| 168 | return ret; |
| 169 | } |