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ba4e7d97 TH |
1 | /************************************************************************** |
2 | * | |
3 | * Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA | |
4 | * All Rights Reserved. | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a | |
7 | * copy of this software and associated documentation files (the | |
8 | * "Software"), to deal in the Software without restriction, including | |
9 | * without limitation the rights to use, copy, modify, merge, publish, | |
10 | * distribute, sub license, and/or sell copies of the Software, and to | |
11 | * permit persons to whom the Software is furnished to do so, subject to | |
12 | * the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the | |
15 | * next paragraph) shall be included in all copies or substantial portions | |
16 | * of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
25 | * | |
26 | **************************************************************************/ | |
27 | /* | |
28 | * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> | |
29 | */ | |
30 | ||
ba4e7d97 TH |
31 | #include <linux/mutex.h> |
32 | #include <linux/slab.h> | |
33 | #include <linux/module.h> | |
760285e7 | 34 | #include <drm/drm_global.h> |
ba4e7d97 | 35 | |
ba4420c2 | 36 | struct drm_global_item { |
ba4e7d97 TH |
37 | struct mutex mutex; |
38 | void *object; | |
39 | int refcount; | |
40 | }; | |
41 | ||
ba4420c2 | 42 | static struct drm_global_item glob[DRM_GLOBAL_NUM]; |
ba4e7d97 | 43 | |
ba4420c2 | 44 | void drm_global_init(void) |
ba4e7d97 TH |
45 | { |
46 | int i; | |
47 | ||
ba4420c2 DA |
48 | for (i = 0; i < DRM_GLOBAL_NUM; ++i) { |
49 | struct drm_global_item *item = &glob[i]; | |
ba4e7d97 TH |
50 | mutex_init(&item->mutex); |
51 | item->object = NULL; | |
52 | item->refcount = 0; | |
53 | } | |
54 | } | |
55 | ||
ba4420c2 | 56 | void drm_global_release(void) |
ba4e7d97 TH |
57 | { |
58 | int i; | |
ba4420c2 DA |
59 | for (i = 0; i < DRM_GLOBAL_NUM; ++i) { |
60 | struct drm_global_item *item = &glob[i]; | |
ba4e7d97 TH |
61 | BUG_ON(item->object != NULL); |
62 | BUG_ON(item->refcount != 0); | |
63 | } | |
64 | } | |
65 | ||
ba4420c2 | 66 | int drm_global_item_ref(struct drm_global_reference *ref) |
ba4e7d97 TH |
67 | { |
68 | int ret; | |
ba4420c2 | 69 | struct drm_global_item *item = &glob[ref->global_type]; |
ba4e7d97 TH |
70 | |
71 | mutex_lock(&item->mutex); | |
72 | if (item->refcount == 0) { | |
5fd9cbad | 73 | item->object = kzalloc(ref->size, GFP_KERNEL); |
ba4e7d97 TH |
74 | if (unlikely(item->object == NULL)) { |
75 | ret = -ENOMEM; | |
76 | goto out_err; | |
77 | } | |
78 | ||
79 | ref->object = item->object; | |
80 | ret = ref->init(ref); | |
81 | if (unlikely(ret != 0)) | |
82 | goto out_err; | |
83 | ||
ba4e7d97 | 84 | } |
df748b02 | 85 | ++item->refcount; |
ba4e7d97 | 86 | ref->object = item->object; |
ba4e7d97 TH |
87 | mutex_unlock(&item->mutex); |
88 | return 0; | |
89 | out_err: | |
ba4e7d97 TH |
90 | mutex_unlock(&item->mutex); |
91 | item->object = NULL; | |
92 | return ret; | |
93 | } | |
ba4420c2 | 94 | EXPORT_SYMBOL(drm_global_item_ref); |
ba4e7d97 | 95 | |
ba4420c2 | 96 | void drm_global_item_unref(struct drm_global_reference *ref) |
ba4e7d97 | 97 | { |
ba4420c2 | 98 | struct drm_global_item *item = &glob[ref->global_type]; |
ba4e7d97 TH |
99 | |
100 | mutex_lock(&item->mutex); | |
101 | BUG_ON(item->refcount == 0); | |
102 | BUG_ON(ref->object != item->object); | |
103 | if (--item->refcount == 0) { | |
104 | ref->release(ref); | |
ba4e7d97 TH |
105 | item->object = NULL; |
106 | } | |
107 | mutex_unlock(&item->mutex); | |
108 | } | |
ba4420c2 | 109 | EXPORT_SYMBOL(drm_global_item_unref); |
ba4e7d97 | 110 |