1 /**************************************************************************
2 * Copyright (c) 2011, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 **************************************************************************/
24 * Initialize an already allocated GEM object of the specified size with
25 * no GEM provided backing store. Instead the caller is responsible for
26 * backing the object and handling it.
28 int drm_gem_private_object_init(struct drm_device *dev,
29 struct drm_gem_object *obj, size_t size)
31 BUG_ON((size & (PAGE_SIZE - 1)) != 0);
36 kref_init(&obj->refcount);
37 atomic_set(&obj->handle_count, 0);
43 void drm_gem_object_release_wrap(struct drm_gem_object *obj)
45 /* Remove the list map if one is present */
46 if (obj->map_list.map) {
47 struct drm_gem_mm *mm = obj->dev->mm_private;
48 struct drm_map_list *list = &obj->map_list;
49 drm_ht_remove_item(&mm->offset_hash, &list->hash);
50 drm_mm_put_block(list->file_offset_node);
55 drm_gem_object_release(obj);
59 * gem_create_mmap_offset - invent an mmap offset
62 * Standard implementation of offset generation for mmap as is
63 * duplicated in several drivers. This belongs in GEM.
65 int gem_create_mmap_offset(struct drm_gem_object *obj)
67 struct drm_device *dev = obj->dev;
68 struct drm_gem_mm *mm = dev->mm_private;
69 struct drm_map_list *list;
70 struct drm_local_map *map;
73 list = &obj->map_list;
74 list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
75 if (list->map == NULL)
79 map->size = obj->size;
82 list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
83 obj->size / PAGE_SIZE, 0, 0);
84 if (!list->file_offset_node) {
85 dev_err(dev->dev, "failed to allocate offset for bo %d\n",
90 list->file_offset_node = drm_mm_get_block(list->file_offset_node,
91 obj->size / PAGE_SIZE, 0);
92 if (!list->file_offset_node) {
96 list->hash.key = list->file_offset_node->start;
97 ret = drm_ht_insert_item(&mm->offset_hash, &list->hash);
99 dev_err(dev->dev, "failed to add to map hash\n");
105 drm_mm_put_block(list->file_offset_node);