Rev 3764 | Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
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| 3260 | Serge | 1 | /************************************************************************** |
| 2 | * |
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| 3 | * Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA |
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| 4 | * All Rights Reserved. |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 7 | * copy of this software and associated documentation files (the |
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| 8 | * "Software"), to deal in the Software without restriction, including |
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| 9 | * without limitation the rights to use, copy, modify, merge, publish, |
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| 10 | * distribute, sub license, and/or sell copies of the Software, and to |
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| 11 | * permit persons to whom the Software is furnished to do so, subject to |
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| 12 | * the following conditions: |
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| 13 | * |
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| 14 | * The above copyright notice and this permission notice (including the |
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| 15 | * next paragraph) shall be included in all copies or substantial portions |
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| 16 | * of the Software. |
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| 17 | * |
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| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
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| 21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
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| 22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
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| 23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
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| 24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | * |
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| 26 | **************************************************************************/ |
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| 27 | /* |
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| 28 | * Authors: Thomas Hellstrom |
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| 29 | */ |
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| 30 | |||
| 31 | #include |
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| 32 | #include |
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| 33 | #include |
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| 34 | #include |
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| 35 | |||
| 36 | struct drm_global_item { |
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| 37 | struct mutex mutex; |
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| 38 | void *object; |
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| 39 | int refcount; |
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| 40 | }; |
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| 41 | |||
| 42 | static struct drm_global_item glob[DRM_GLOBAL_NUM]; |
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| 43 | |||
| 44 | void drm_global_init(void) |
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| 45 | { |
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| 46 | int i; |
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| 47 | |||
| 48 | for (i = 0; i < DRM_GLOBAL_NUM; ++i) { |
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| 49 | struct drm_global_item *item = &glob[i]; |
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| 50 | mutex_init(&item->mutex); |
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| 51 | item->object = NULL; |
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| 52 | item->refcount = 0; |
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| 53 | } |
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| 54 | } |
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| 55 | |||
| 56 | void drm_global_release(void) |
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| 57 | { |
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| 58 | int i; |
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| 59 | for (i = 0; i < DRM_GLOBAL_NUM; ++i) { |
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| 60 | struct drm_global_item *item = &glob[i]; |
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| 61 | BUG_ON(item->object != NULL); |
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| 62 | BUG_ON(item->refcount != 0); |
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| 63 | } |
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| 64 | } |
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| 65 | |||
| 66 | int drm_global_item_ref(struct drm_global_reference *ref) |
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| 67 | { |
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| 68 | int ret; |
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| 69 | struct drm_global_item *item = &glob[ref->global_type]; |
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| 70 | void *object; |
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| 71 | |||
| 72 | mutex_lock(&item->mutex); |
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| 73 | if (item->refcount == 0) { |
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| 74 | item->object = kzalloc(ref->size, GFP_KERNEL); |
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| 75 | if (unlikely(item->object == NULL)) { |
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| 76 | ret = -ENOMEM; |
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| 77 | goto out_err; |
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| 78 | } |
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| 79 | |||
| 80 | ref->object = item->object; |
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| 81 | ret = ref->init(ref); |
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| 82 | if (unlikely(ret != 0)) |
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| 83 | goto out_err; |
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| 84 | |||
| 85 | } |
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| 86 | ++item->refcount; |
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| 87 | ref->object = item->object; |
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| 88 | object = item->object; |
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| 89 | mutex_unlock(&item->mutex); |
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| 90 | return 0; |
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| 91 | out_err: |
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| 92 | mutex_unlock(&item->mutex); |
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| 93 | item->object = NULL; |
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| 94 | return ret; |
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| 95 | } |
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| 96 | EXPORT_SYMBOL(drm_global_item_ref); |
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| 97 | |||
| 98 | void drm_global_item_unref(struct drm_global_reference *ref) |
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| 99 | { |
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| 100 | struct drm_global_item *item = &glob[ref->global_type]; |
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| 101 | |||
| 102 | mutex_lock(&item->mutex); |
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| 103 | BUG_ON(item->refcount == 0); |
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| 104 | BUG_ON(ref->object != item->object); |
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| 105 | if (--item->refcount == 0) { |
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| 106 | ref->release(ref); |
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| 107 | item->object = NULL; |
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| 108 | } |
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| 109 | mutex_unlock(&item->mutex); |
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| 110 | } |
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| 111 | EXPORT_SYMBOL(drm_global_item_unref); |
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| 112 |