1 /**************************************************************************
2 * Copyright (c) 2011, Intel Corporation.
3 * All Rights Reserved.
4 *
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.
8 *
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
12 * more details.
13 *
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.
17 *
18 **************************************************************************/
19
20 #include <drm/drmP.h>
21 #include <drm/drm.h>
22
drm_gem_object_release_wrap(struct drm_gem_object * obj)23 void drm_gem_object_release_wrap(struct drm_gem_object *obj)
24 {
25 /* Remove the list map if one is present */
26 if (obj->map_list.map) {
27 struct drm_gem_mm *mm = obj->dev->mm_private;
28 struct drm_map_list *list = &obj->map_list;
29 drm_ht_remove_item(&mm->offset_hash, &list->hash);
30 drm_mm_put_block(list->file_offset_node);
31 kfree(list->map);
32 list->map = NULL;
33 }
34 drm_gem_object_release(obj);
35 }
36
37 /**
38 * gem_create_mmap_offset - invent an mmap offset
39 * @obj: our object
40 *
41 * Standard implementation of offset generation for mmap as is
42 * duplicated in several drivers. This belongs in GEM.
43 */
gem_create_mmap_offset(struct drm_gem_object * obj)44 int gem_create_mmap_offset(struct drm_gem_object *obj)
45 {
46 struct drm_device *dev = obj->dev;
47 struct drm_gem_mm *mm = dev->mm_private;
48 struct drm_map_list *list;
49 struct drm_local_map *map;
50 int ret;
51
52 list = &obj->map_list;
53 list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
54 if (list->map == NULL)
55 return -ENOMEM;
56 map = list->map;
57 map->type = _DRM_GEM;
58 map->size = obj->size;
59 map->handle = obj;
60
61 list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
62 obj->size / PAGE_SIZE, 0, 0);
63 if (!list->file_offset_node) {
64 dev_err(dev->dev, "failed to allocate offset for bo %d\n",
65 obj->name);
66 ret = -ENOSPC;
67 goto free_it;
68 }
69 list->file_offset_node = drm_mm_get_block(list->file_offset_node,
70 obj->size / PAGE_SIZE, 0);
71 if (!list->file_offset_node) {
72 ret = -ENOMEM;
73 goto free_it;
74 }
75 list->hash.key = list->file_offset_node->start;
76 ret = drm_ht_insert_item(&mm->offset_hash, &list->hash);
77 if (ret) {
78 dev_err(dev->dev, "failed to add to map hash\n");
79 goto free_mm;
80 }
81 return 0;
82
83 free_mm:
84 drm_mm_put_block(list->file_offset_node);
85 free_it:
86 kfree(list->map);
87 list->map = NULL;
88 return ret;
89 }
90