Rev 4560 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 3260 | Serge | 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 |
||
| 29 | */ |
||
| 30 | |||
| 31 | #include |
||
| 32 | #include |
||
| 33 | #include |
||
| 34 | #include |
||
| 35 | |||
| 36 | struct drm_global_item { |
||
| 37 | struct mutex mutex; |
||
| 38 | void *object; |
||
| 39 | int refcount; |
||
| 40 | }; |
||
| 41 | |||
| 42 | static struct drm_global_item glob[DRM_GLOBAL_NUM]; |
||
| 43 | |||
| 44 | void drm_global_init(void) |
||
| 45 | { |
||
| 46 | int i; |
||
| 47 | |||
| 48 | for (i = 0; i < DRM_GLOBAL_NUM; ++i) { |
||
| 49 | struct drm_global_item *item = &glob[i]; |
||
| 50 | mutex_init(&item->mutex); |
||
| 51 | item->object = NULL; |
||
| 52 | item->refcount = 0; |
||
| 53 | } |
||
| 54 | } |
||
| 55 | |||
| 56 | void drm_global_release(void) |
||
| 57 | { |
||
| 58 | int i; |
||
| 59 | for (i = 0; i < DRM_GLOBAL_NUM; ++i) { |
||
| 60 | struct drm_global_item *item = &glob[i]; |
||
| 61 | BUG_ON(item->object != NULL); |
||
| 62 | BUG_ON(item->refcount != 0); |
||
| 63 | } |
||
| 64 | } |
||
| 65 | |||
| 66 | int drm_global_item_ref(struct drm_global_reference *ref) |
||
| 67 | { |
||
| 68 | int ret; |
||
| 69 | struct drm_global_item *item = &glob[ref->global_type]; |
||
| 70 | |||
| 71 | mutex_lock(&item->mutex); |
||
| 72 | if (item->refcount == 0) { |
||
| 73 | item->object = kzalloc(ref->size, GFP_KERNEL); |
||
| 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 | |||
| 84 | } |
||
| 85 | ++item->refcount; |
||
| 86 | ref->object = item->object; |
||
| 87 | mutex_unlock(&item->mutex); |
||
| 88 | return 0; |
||
| 89 | out_err: |
||
| 90 | mutex_unlock(&item->mutex); |
||
| 91 | item->object = NULL; |
||
| 92 | return ret; |
||
| 93 | } |
||
| 94 | EXPORT_SYMBOL(drm_global_item_ref); |
||
| 95 | |||
| 96 | void drm_global_item_unref(struct drm_global_reference *ref) |
||
| 97 | { |
||
| 98 | struct drm_global_item *item = &glob[ref->global_type]; |
||
| 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); |
||
| 105 | item->object = NULL; |
||
| 106 | } |
||
| 107 | mutex_unlock(&item->mutex); |
||
| 108 | } |
||
| 109 | EXPORT_SYMBOL(drm_global_item_unref); |
||
| 110 |