[net-next-2.6.git] / drivers / gpu / drm / ttm / ttm_bo_manager.c

/**************************************************************************
 *
 * Copyright (c) 2007-2010 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 "ttm/ttm_bo_driver.h"
#include "ttm/ttm_placement.h"
#include "drm_mm.h"
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/module.h>

/**
 * Currently we use a spinlock for the lock, but a mutex *may* be
 * more appropriate to reduce scheduling latency if the range manager
 * ends up with very fragmented allocation patterns.
 */

struct ttm_range_manager {
	struct drm_mm mm;
	spinlock_t lock;
};

static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
			       struct ttm_buffer_object *bo,
			       struct ttm_placement *placement,
			       struct ttm_mem_reg *mem)
{
	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
	struct drm_mm *mm = &rman->mm;
	struct drm_mm_node *node = NULL;
	unsigned long lpfn;
	int ret;

	lpfn = placement->lpfn;
	if (!lpfn)
		lpfn = man->size;
	do {
		ret = drm_mm_pre_get(mm);
		if (unlikely(ret))
			return ret;

		spin_lock(&rman->lock);
		node = drm_mm_search_free_in_range(mm,
					mem->num_pages, mem->page_alignment,
					placement->fpfn, lpfn, 1);
		if (unlikely(node == NULL)) {
			spin_unlock(&rman->lock);
			return 0;
		}
		node = drm_mm_get_block_atomic_range(node, mem->num_pages,
						     mem->page_alignment,
						     placement->fpfn,
						     lpfn);
		spin_unlock(&rman->lock);
	} while (node == NULL);

	mem->mm_node = node;
	mem->start = node->start;
	return 0;
}

static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
				struct ttm_mem_reg *mem)
{
	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;

	if (mem->mm_node) {
		spin_lock(&rman->lock);
		drm_mm_put_block(mem->mm_node);
		spin_unlock(&rman->lock);
		mem->mm_node = NULL;
	}
}

static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
			   unsigned long p_size)
{
	struct ttm_range_manager *rman;
	int ret;

	rman = kzalloc(sizeof(*rman), GFP_KERNEL);
	if (!rman)
		return -ENOMEM;

	ret = drm_mm_init(&rman->mm, 0, p_size);
	if (ret) {
		kfree(rman);
		return ret;
	}

	spin_lock_init(&rman->lock);
	man->priv = rman;
	return 0;
}

static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
{
	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
	struct drm_mm *mm = &rman->mm;

	spin_lock(&rman->lock);
	if (drm_mm_clean(mm)) {
		drm_mm_takedown(mm);
		spin_unlock(&rman->lock);
		kfree(rman);
		man->priv = NULL;
		return 0;
	}
	spin_unlock(&rman->lock);
	return -EBUSY;
}

static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
			     const char *prefix)
{
	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;

	spin_lock(&rman->lock);
	drm_mm_debug_table(&rman->mm, prefix);
	spin_unlock(&rman->lock);
}

const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
	ttm_bo_man_init,
	ttm_bo_man_takedown,
	ttm_bo_man_get_node,
	ttm_bo_man_put_node,
	ttm_bo_man_debug
};
EXPORT_SYMBOL(ttm_bo_manager_func);
Commit	Line	Data
d961db75 BS	1	/**************************************************************************
d961db75 BS	2	*
d7a67cb1	3	* Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
d961db75 BS	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 "ttm/ttm_bo_driver.h"
	33	#include "ttm/ttm_placement.h"
d7a67cb1	34	#include "drm_mm.h"
d961db75	35	#include <linux/slab.h>
d7a67cb1	36	#include <linux/spinlock.h>
d961db75 BS	37	#include <linux/module.h>
d961db75 BS	38
d7a67cb1 TH	39	/**
	40	* Currently we use a spinlock for the lock, but a mutex may be
	41	* more appropriate to reduce scheduling latency if the range manager
	42	* ends up with very fragmented allocation patterns.
	43	*/
	44
	45	struct ttm_range_manager {
	46	struct drm_mm mm;
	47	spinlock_t lock;
	48	};
	49
d961db75 BS	50	static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
	51	struct ttm_buffer_object *bo,
	52	struct ttm_placement *placement,
	53	struct ttm_mem_reg *mem)
	54	{
d7a67cb1 TH	55	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
d7a67cb1 TH	56	struct drm_mm *mm = &rman->mm;
d961db75 BS	57	struct drm_mm_node *node = NULL;
	58	unsigned long lpfn;
	59	int ret;
	60
	61	lpfn = placement->lpfn;
	62	if (!lpfn)
	63	lpfn = man->size;
	64	do {
	65	ret = drm_mm_pre_get(mm);
	66	if (unlikely(ret))
	67	return ret;
	68
d7a67cb1	69	spin_lock(&rman->lock);
d961db75 BS	70	node = drm_mm_search_free_in_range(mm,
	71	mem->num_pages, mem->page_alignment,
	72	placement->fpfn, lpfn, 1);
	73	if (unlikely(node == NULL)) {
d7a67cb1	74	spin_unlock(&rman->lock);
d961db75 BS	75	return 0;
	76	}
	77	node = drm_mm_get_block_atomic_range(node, mem->num_pages,
d7a67cb1 TH	78	mem->page_alignment,
	79	placement->fpfn,
	80	lpfn);
	81	spin_unlock(&rman->lock);
d961db75 BS	82	} while (node == NULL);
	83
	84	mem->mm_node = node;
	85	mem->start = node->start;
	86	return 0;
	87	}
	88
	89	static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
	90	struct ttm_mem_reg *mem)
	91	{
d7a67cb1	92	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
d961db75 BS	93
d961db75 BS	94	if (mem->mm_node) {
d7a67cb1	95	spin_lock(&rman->lock);
d961db75	96	drm_mm_put_block(mem->mm_node);
d7a67cb1	97	spin_unlock(&rman->lock);
d961db75 BS	98	mem->mm_node = NULL;
	99	}
	100	}
	101
	102	static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
	103	unsigned long p_size)
	104	{
d7a67cb1	105	struct ttm_range_manager *rman;
d961db75 BS	106	int ret;
d961db75 BS	107
d7a67cb1 TH	108	rman = kzalloc(sizeof(*rman), GFP_KERNEL);
d7a67cb1 TH	109	if (!rman)
d961db75 BS	110	return -ENOMEM;
d961db75 BS	111
d7a67cb1	112	ret = drm_mm_init(&rman->mm, 0, p_size);
d961db75	113	if (ret) {
d7a67cb1	114	kfree(rman);
d961db75 BS	115	return ret;
	116	}
	117
d7a67cb1 TH	118	spin_lock_init(&rman->lock);
d7a67cb1 TH	119	man->priv = rman;
d961db75 BS	120	return 0;
	121	}
	122
	123	static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
	124	{
d7a67cb1 TH	125	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
d7a67cb1 TH	126	struct drm_mm *mm = &rman->mm;
d961db75	127
d7a67cb1	128	spin_lock(&rman->lock);
d961db75 BS	129	if (drm_mm_clean(mm)) {
d961db75 BS	130	drm_mm_takedown(mm);
d7a67cb1 TH	131	spin_unlock(&rman->lock);
d7a67cb1 TH	132	kfree(rman);
d961db75	133	man->priv = NULL;
d7a67cb1 TH	134	return 0;
	135	}
	136	spin_unlock(&rman->lock);
	137	return -EBUSY;
d961db75 BS	138	}
	139
	140	static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
	141	const char *prefix)
	142	{
d7a67cb1	143	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
d961db75	144
d7a67cb1 TH	145	spin_lock(&rman->lock);
	146	drm_mm_debug_table(&rman->mm, prefix);
	147	spin_unlock(&rman->lock);
d961db75 BS	148	}
	149
	150	const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
	151	ttm_bo_man_init,
	152	ttm_bo_man_takedown,
	153	ttm_bo_man_get_node,
	154	ttm_bo_man_put_node,
	155	ttm_bo_man_debug
	156	};
	157	EXPORT_SYMBOL(ttm_bo_manager_func);