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
31 #include <sys/cdefs.h>
32 #include <dev/drm2/drmP.h>
33 #include <dev/drm2/drm_global.h>
34
35 MALLOC_DEFINE(M_DRM_GLOBAL, "drm_global", "DRM Global Items");
36
37 struct drm_global_item {
38 struct sx mutex;
39 void *object;
40 int refcount;
41 };
42
43 static struct drm_global_item glob[DRM_GLOBAL_NUM];
44
drm_global_init(void)45 void drm_global_init(void)
46 {
47 int i;
48
49 for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
50 struct drm_global_item *item = &glob[i];
51 sx_init(&item->mutex, "drmgi");
52 item->object = NULL;
53 item->refcount = 0;
54 }
55 }
56
drm_global_release(void)57 void drm_global_release(void)
58 {
59 int i;
60 for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
61 struct drm_global_item *item = &glob[i];
62 MPASS(item->object == NULL);
63 MPASS(item->refcount == 0);
64 sx_destroy(&item->mutex);
65 }
66 }
67
drm_global_item_ref(struct drm_global_reference * ref)68 int drm_global_item_ref(struct drm_global_reference *ref)
69 {
70 int ret;
71 struct drm_global_item *item = &glob[ref->global_type];
72
73 sx_xlock(&item->mutex);
74 if (item->refcount == 0) {
75 item->object = malloc(ref->size, M_DRM_GLOBAL,
76 M_NOWAIT | M_ZERO);
77 if (unlikely(item->object == NULL)) {
78 ret = -ENOMEM;
79 goto out_err;
80 }
81
82 ref->object = item->object;
83 ret = ref->init(ref);
84 if (unlikely(ret != 0))
85 goto out_err;
86
87 }
88 ++item->refcount;
89 ref->object = item->object;
90 sx_xunlock(&item->mutex);
91 return 0;
92 out_err:
93 sx_xunlock(&item->mutex);
94 item->object = NULL;
95 return ret;
96 }
97 EXPORT_SYMBOL(drm_global_item_ref);
98
drm_global_item_unref(struct drm_global_reference * ref)99 void drm_global_item_unref(struct drm_global_reference *ref)
100 {
101 struct drm_global_item *item = &glob[ref->global_type];
102
103 sx_xlock(&item->mutex);
104 MPASS(item->refcount != 0);
105 MPASS(ref->object == item->object);
106 if (--item->refcount == 0) {
107 ref->release(ref);
108 free(item->object, M_DRM_GLOBAL);
109 item->object = NULL;
110 }
111 sx_xunlock(&item->mutex);
112 }
113 EXPORT_SYMBOL(drm_global_item_unref);
114