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__FBSDID("$FreeBSD$");
33
34#include <dev/drm2/drmP.h>
35#include <dev/drm2/drm_global.h>
36
37MALLOC_DEFINE(M_DRM_GLOBAL, "drm_global", "DRM Global Items");
38
39struct drm_global_item {
40	struct sx mutex;
41	void *object;
42	int refcount;
43};
44
45static struct drm_global_item glob[DRM_GLOBAL_NUM];
46
47void drm_global_init(void)
48{
49	int i;
50
51	for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
52		struct drm_global_item *item = &glob[i];
53		sx_init(&item->mutex, "drmgi");
54		item->object = NULL;
55		item->refcount = 0;
56	}
57}
58
59void drm_global_release(void)
60{
61	int i;
62	for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
63		struct drm_global_item *item = &glob[i];
64		MPASS(item->object == NULL);
65		MPASS(item->refcount == 0);
66		sx_destroy(&item->mutex);
67	}
68}
69
70int drm_global_item_ref(struct drm_global_reference *ref)
71{
72	int ret;
73	struct drm_global_item *item = &glob[ref->global_type];
74	void *object;
75
76	sx_xlock(&item->mutex);
77	if (item->refcount == 0) {
78		item->object = malloc(ref->size, M_DRM_GLOBAL,
79		    M_NOWAIT | M_ZERO);
80		if (unlikely(item->object == NULL)) {
81			ret = -ENOMEM;
82			goto out_err;
83		}
84
85		ref->object = item->object;
86		ret = ref->init(ref);
87		if (unlikely(ret != 0))
88			goto out_err;
89
90	}
91	++item->refcount;
92	ref->object = item->object;
93	object = item->object;
94	sx_xunlock(&item->mutex);
95	return 0;
96out_err:
97	sx_xunlock(&item->mutex);
98	item->object = NULL;
99	return ret;
100}
101EXPORT_SYMBOL(drm_global_item_ref);
102
103void drm_global_item_unref(struct drm_global_reference *ref)
104{
105	struct drm_global_item *item = &glob[ref->global_type];
106
107	sx_xlock(&item->mutex);
108	MPASS(item->refcount != 0);
109	MPASS(ref->object == item->object);
110	if (--item->refcount == 0) {
111		ref->release(ref);
112		free(item->object, M_DRM_GLOBAL);
113		item->object = NULL;
114	}
115	sx_xunlock(&item->mutex);
116}
117EXPORT_SYMBOL(drm_global_item_unref);
118