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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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3764 | Serge | 34 | #include |
3260 | Serge | 35 | #include |
36 | |||
37 | struct drm_global_item { |
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38 | struct mutex mutex; |
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39 | void *object; |
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40 | int refcount; |
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41 | }; |
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42 | |||
43 | static struct drm_global_item glob[DRM_GLOBAL_NUM]; |
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44 | |||
45 | void drm_global_init(void) |
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46 | { |
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47 | int i; |
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48 | |||
49 | for (i = 0; i < DRM_GLOBAL_NUM; ++i) { |
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50 | struct drm_global_item *item = &glob[i]; |
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51 | mutex_init(&item->mutex); |
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52 | item->object = NULL; |
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53 | item->refcount = 0; |
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54 | } |
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55 | } |
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56 | |||
57 | void drm_global_release(void) |
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58 | { |
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59 | int i; |
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60 | for (i = 0; i < DRM_GLOBAL_NUM; ++i) { |
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61 | struct drm_global_item *item = &glob[i]; |
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62 | BUG_ON(item->object != NULL); |
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63 | BUG_ON(item->refcount != 0); |
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64 | } |
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65 | } |
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66 | |||
67 | int drm_global_item_ref(struct drm_global_reference *ref) |
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68 | { |
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69 | int ret; |
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70 | struct drm_global_item *item = &glob[ref->global_type]; |
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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 | mutex_unlock(&item->mutex); |
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89 | return 0; |
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90 | out_err: |
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91 | mutex_unlock(&item->mutex); |
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92 | item->object = NULL; |
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93 | return ret; |
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94 | } |
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95 | EXPORT_SYMBOL(drm_global_item_ref); |
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96 | |||
97 | void drm_global_item_unref(struct drm_global_reference *ref) |
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98 | { |
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99 | struct drm_global_item *item = &glob[ref->global_type]; |
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100 | |||
101 | mutex_lock(&item->mutex); |
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102 | BUG_ON(item->refcount == 0); |
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103 | BUG_ON(ref->object != item->object); |
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104 | if (--item->refcount == 0) { |
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105 | ref->release(ref); |
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106 | item->object = NULL; |
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107 | } |
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108 | mutex_unlock(&item->mutex); |
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109 | } |
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110 | EXPORT_SYMBOL(drm_global_item_unref);>> |
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111 |