[deliverable/linux.git] / drivers / gpu / drm / ttm / ttm_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 <thellstrom-at-vmware-dot-com>
 */

#include "ttm/ttm_module.h"
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/module.h>

struct ttm_global_item {
	struct mutex mutex;
	void *object;
	int refcount;
};

static struct ttm_global_item glob[TTM_GLOBAL_NUM];

void ttm_global_init(void)
{
	int i;

	for (i = 0; i < TTM_GLOBAL_NUM; ++i) {
		struct ttm_global_item *item = &glob[i];
		mutex_init(&item->mutex);
		item->object = NULL;
		item->refcount = 0;
	}
}

void ttm_global_release(void)
{
	int i;
	for (i = 0; i < TTM_GLOBAL_NUM; ++i) {
		struct ttm_global_item *item = &glob[i];
		BUG_ON(item->object != NULL);
		BUG_ON(item->refcount != 0);
	}
}

int ttm_global_item_ref(struct ttm_global_reference *ref)
{
	int ret;
	struct ttm_global_item *item = &glob[ref->global_type];
	void *object;

	mutex_lock(&item->mutex);
	if (item->refcount == 0) {
		item->object = kmalloc(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;
	object = item->object;
	mutex_unlock(&item->mutex);
	return 0;
out_err:
	kfree(item->object);
	mutex_unlock(&item->mutex);
	item->object = NULL;
	return ret;
}
EXPORT_SYMBOL(ttm_global_item_ref);

void ttm_global_item_unref(struct ttm_global_reference *ref)
{
	struct ttm_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);
		kfree(item->object);
		item->object = NULL;
	}
	mutex_unlock(&item->mutex);
}
EXPORT_SYMBOL(ttm_global_item_unref);
Commit	Line	Data
ba4e7d97 TH	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 "ttm/ttm_module.h"
	32	#include <linux/mutex.h>
	33	#include <linux/slab.h>
	34	#include <linux/module.h>
	35
	36	struct ttm_global_item {
	37	struct mutex mutex;
	38	void *object;
	39	int refcount;
	40	};
	41
	42	static struct ttm_global_item glob[TTM_GLOBAL_NUM];
	43
	44	void ttm_global_init(void)
	45	{
	46	int i;
	47
	48	for (i = 0; i < TTM_GLOBAL_NUM; ++i) {
	49	struct ttm_global_item *item = &glob[i];
	50	mutex_init(&item->mutex);
	51	item->object = NULL;
	52	item->refcount = 0;
	53	}
	54	}
	55
	56	void ttm_global_release(void)
	57	{
	58	int i;
	59	for (i = 0; i < TTM_GLOBAL_NUM; ++i) {
	60	struct ttm_global_item *item = &glob[i];
	61	BUG_ON(item->object != NULL);
	62	BUG_ON(item->refcount != 0);
	63	}
	64	}
65
66	int ttm_global_item_ref(struct ttm_global_reference *ref)
67	{
68	int ret;
69	struct ttm_global_item *item = &glob[ref->global_type];
70	void *object;
71
72	mutex_lock(&item->mutex);
73	if (item->refcount == 0) {
74	item->object = kmalloc(ref->size, GFP_KERNEL);
75	if (unlikely(item->object == NULL)) {
76	ret = -ENOMEM;
77	goto out_err;
78	}
79
80	ref->object = item->object;
81	ret = ref->init(ref);
82	if (unlikely(ret != 0))
83	goto out_err;
84
85	++item->refcount;
86	}
87	ref->object = item->object;
88	object = item->object;
89	mutex_unlock(&item->mutex);
90	return 0;
91	out_err:
92	kfree(item->object);
93	mutex_unlock(&item->mutex);
94	item->object = NULL;
95	return ret;
96	}
97	EXPORT_SYMBOL(ttm_global_item_ref);
98
99	void ttm_global_item_unref(struct ttm_global_reference *ref)
100	{
101	struct ttm_global_item *item = &glob[ref->global_type];
102
103	mutex_lock(&item->mutex);
104	BUG_ON(item->refcount == 0);
105	BUG_ON(ref->object != item->object);
106	if (--item->refcount == 0) {
107	ref->release(ref);
108	kfree(item->object);
109	item->object = NULL;
110	}
111	mutex_unlock(&item->mutex);
112	}
113	EXPORT_SYMBOL(ttm_global_item_unref);
114