WebSVN – Kolibri OS – Diff – /drivers/video/drm/drm_global.c


/**************************************************************************
 *
 * Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/
/*
 * Authors: Thomas Hellstrom 
 */
 
#include 
#include 
#include 
 
#include 
 
struct drm_global_item {
	struct mutex mutex;
	void *object;
	int refcount;
};
 
static struct drm_global_item glob[DRM_GLOBAL_NUM];
 
void drm_global_init(void)
{
	int i;
 
	for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
		struct drm_global_item *item = &glob[i];
		mutex_init(&item->mutex);
		item->object = NULL;
		item->refcount = 0;
	}
}
 
void drm_global_release(void)
{
	int i;
	for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
		struct drm_global_item *item = &glob[i];
		BUG_ON(item->object != NULL);
		BUG_ON(item->refcount != 0);
	}
}
 
int drm_global_item_ref(struct drm_global_reference *ref)
{
	int ret;
	struct drm_global_item *item = &glob[ref->global_type];
 
	mutex_lock(&item->mutex);
	if (item->refcount == 0) {
		item->object = kzalloc(ref->size, GFP_KERNEL);
		if (unlikely(item->object == NULL)) {
			ret = -ENOMEM;
			goto out_err;
		}
 
		ref->object = item->object;
		ret = ref->init(ref);
		if (unlikely(ret != 0))
			goto out_err;
 
	}
	++item->refcount;
	ref->object = item->object;
	mutex_unlock(&item->mutex);
	return 0;
out_err:
	mutex_unlock(&item->mutex);
	item->object = NULL;
	return ret;
}
EXPORT_SYMBOL(drm_global_item_ref);
 
void drm_global_item_unref(struct drm_global_reference *ref)
{
	struct drm_global_item *item = &glob[ref->global_type];
 
	mutex_lock(&item->mutex);
	BUG_ON(item->refcount == 0);
	BUG_ON(ref->object != item->object);
	if (--item->refcount == 0) {
		ref->release(ref);
		item->object = NULL;
	}
	mutex_unlock(&item->mutex);
}
EXPORT_SYMBOL(drm_global_item_unref);

Rev 4560	Rev 6084
1	/**************************************************************************	1	/**************************************************************************
2	*	2	*
3	* Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA	3	* Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA
4	* All Rights Reserved.	4	* All Rights Reserved.
5	*	5	*
6	* Permission is hereby granted, free of charge, to any person obtaining a	6	* Permission is hereby granted, free of charge, to any person obtaining a
7	* copy of this software and associated documentation files (the	7	* copy of this software and associated documentation files (the
8	* "Software"), to deal in the Software without restriction, including	8	* "Software"), to deal in the Software without restriction, including
9	* without limitation the rights to use, copy, modify, merge, publish,	9	* without limitation the rights to use, copy, modify, merge, publish,
10	* distribute, sub license, and/or sell copies of the Software, and to	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	11	* permit persons to whom the Software is furnished to do so, subject to
12	* the following conditions:	12	* the following conditions:
13	*	13	*
14	* The above copyright notice and this permission notice (including the	14	* The above copyright notice and this permission notice (including the
15	* next paragraph) shall be included in all copies or substantial portions	15	* next paragraph) shall be included in all copies or substantial portions
16	* of the Software.	16	* of the Software.
17	*	17	*
18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR	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,	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL	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,	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	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	23	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24	* USE OR OTHER DEALINGS IN THE SOFTWARE.	24	* USE OR OTHER DEALINGS IN THE SOFTWARE.
25	*	25	*
26	**************************************************************************/	26	**************************************************************************/
27	/*	27	/*
28	* Authors: Thomas Hellstrom	28	* Authors: Thomas Hellstrom
29	*/	29	*/
30		30
31	#include	31	#include
32	#include	32	#include
33	#include	33	#include
34	#include	-
35	#include	34	#include
36		35
37	struct drm_global_item {	36	struct drm_global_item {
38	struct mutex mutex;	37	struct mutex mutex;
39	void *object;	38	void *object;
40	int refcount;	39	int refcount;
41	};	40	};
42		41
43	static struct drm_global_item glob[DRM_GLOBAL_NUM];	42	static struct drm_global_item glob[DRM_GLOBAL_NUM];
44		43
45	void drm_global_init(void)	44	void drm_global_init(void)
46	{	45	{
47	int i;	46	int i;
48		47
49	for (i = 0; i < DRM_GLOBAL_NUM; ++i) {	48	for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
50	struct drm_global_item *item = &glob[i];	49	struct drm_global_item *item = &glob[i];
51	mutex_init(&item->mutex);	50	mutex_init(&item->mutex);
52	item->object = NULL;	51	item->object = NULL;
53	item->refcount = 0;	52	item->refcount = 0;
54	}	53	}
55	}	54	}
56		55
57	void drm_global_release(void)	56	void drm_global_release(void)
58	{	57	{
59	int i;	58	int i;
60	for (i = 0; i < DRM_GLOBAL_NUM; ++i) {	59	for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
61	struct drm_global_item *item = &glob[i];	60	struct drm_global_item *item = &glob[i];
62	BUG_ON(item->object != NULL);	61	BUG_ON(item->object != NULL);
63	BUG_ON(item->refcount != 0);	62	BUG_ON(item->refcount != 0);
64	}	63	}
65	}	64	}
66		65
67	int drm_global_item_ref(struct drm_global_reference *ref)	66	int drm_global_item_ref(struct drm_global_reference *ref)
68	{	67	{
69	int ret;	68	int ret;
70	struct drm_global_item *item = &glob[ref->global_type];	69	struct drm_global_item *item = &glob[ref->global_type];
71		70
72	mutex_lock(&item->mutex);	71	mutex_lock(&item->mutex);
73	if (item->refcount == 0) {	72	if (item->refcount == 0) {
74	item->object = kzalloc(ref->size, GFP_KERNEL);	73	item->object = kzalloc(ref->size, GFP_KERNEL);
75	if (unlikely(item->object == NULL)) {	74	if (unlikely(item->object == NULL)) {
76	ret = -ENOMEM;	75	ret = -ENOMEM;
77	goto out_err;	76	goto out_err;
78	}	77	}
79		78
80	ref->object = item->object;	79	ref->object = item->object;
81	ret = ref->init(ref);	80	ret = ref->init(ref);
82	if (unlikely(ret != 0))	81	if (unlikely(ret != 0))
83	goto out_err;	82	goto out_err;
84		83
85	}	84	}
86	++item->refcount;	85	++item->refcount;
87	ref->object = item->object;	86	ref->object = item->object;
88	mutex_unlock(&item->mutex);	87	mutex_unlock(&item->mutex);
89	return 0;	88	return 0;
90	out_err:	89	out_err:
91	mutex_unlock(&item->mutex);	90	mutex_unlock(&item->mutex);
92	item->object = NULL;	91	item->object = NULL;
93	return ret;	92	return ret;
94	}	93	}
95	EXPORT_SYMBOL(drm_global_item_ref);	94	EXPORT_SYMBOL(drm_global_item_ref);
96		95
97	void drm_global_item_unref(struct drm_global_reference *ref)	96	void drm_global_item_unref(struct drm_global_reference *ref)
98	{	97	{
99	struct drm_global_item *item = &glob[ref->global_type];	98	struct drm_global_item *item = &glob[ref->global_type];
100		99
101	mutex_lock(&item->mutex);	100	mutex_lock(&item->mutex);
102	BUG_ON(item->refcount == 0);	101	BUG_ON(item->refcount == 0);
103	BUG_ON(ref->object != item->object);	102	BUG_ON(ref->object != item->object);
104	if (--item->refcount == 0) {	103	if (--item->refcount == 0) {
105	ref->release(ref);	104	ref->release(ref);
106	item->object = NULL;	105	item->object = NULL;
107	}	106	}
108	mutex_unlock(&item->mutex);	107	mutex_unlock(&item->mutex);
109	}	108	}
110	EXPORT_SYMBOL(drm_global_item_unref);	109	EXPORT_SYMBOL(drm_global_item_unref);

Subversion Repositories Kolibri OS

(root)/drivers/video/drm/drm_global.c @ 6132 – Rev 4560 → 6084