WebSVN – Kolibri OS – Blame – /drivers/video/drm/ttm/ttm_bo_manager.c

Rev	Author	Line No.	Line
4075	Serge	1	/**************************************************************************
		2	*
		3	* Copyright (c) 2007-2010 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
		29	*/
		30
		31	#include
		32	#include
		33	#include
		34	#include
		35	#include
		36	#include
		37	#include
		38
		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
		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,
5078	serge	53	uint32_t flags,
4075	Serge	54	struct ttm_mem_reg *mem)
		55	{
		56	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
		57	struct drm_mm *mm = &rman->mm;
		58	struct drm_mm_node *node = NULL;
5078	serge	59	enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
4075	Serge	60	unsigned long lpfn;
		61	int ret;
		62
		63	lpfn = placement->lpfn;
		64	if (!lpfn)
		65	lpfn = man->size;
		66
4112	Serge	67	node = kzalloc(sizeof(*node), GFP_KERNEL);
		68	if (!node)
		69	return -ENOMEM;
		70
5078	serge	71	if (flags & TTM_PL_FLAG_TOPDOWN)
		72	aflags = DRM_MM_CREATE_TOP;
		73
4075	Serge	74	spin_lock(&rman->lock);
5078	serge	75	ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
		76	mem->page_alignment, 0,
4112	Serge	77	placement->fpfn, lpfn,
5078	serge	78	DRM_MM_SEARCH_BEST,
		79	aflags);
4075	Serge	80	spin_unlock(&rman->lock);
		81
4112	Serge	82	if (unlikely(ret)) {
		83	kfree(node);
		84	} else {
4075	Serge	85	mem->mm_node = node;
		86	mem->start = node->start;
4112	Serge	87	}
		88
4075	Serge	89	return 0;
		90	}
		91
		92	static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
		93	struct ttm_mem_reg *mem)
		94	{
		95	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
		96
		97	if (mem->mm_node) {
		98	spin_lock(&rman->lock);
4112	Serge	99	drm_mm_remove_node(mem->mm_node);
4075	Serge	100	spin_unlock(&rman->lock);
4112	Serge	101
		102	kfree(mem->mm_node);
4075	Serge	103	mem->mm_node = NULL;
		104	}
		105	}
		106
		107	static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
		108	unsigned long p_size)
		109	{
		110	struct ttm_range_manager *rman;
		111
		112	rman = kzalloc(sizeof(*rman), GFP_KERNEL);
		113	if (!rman)
		114	return -ENOMEM;
		115
		116	drm_mm_init(&rman->mm, 0, p_size);
		117	spin_lock_init(&rman->lock);
		118	man->priv = rman;
		119	return 0;
		120	}
		121
		122	static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
		123	{
		124	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
		125	struct drm_mm *mm = &rman->mm;
		126
		127	spin_lock(&rman->lock);
		128	if (drm_mm_clean(mm)) {
		129	drm_mm_takedown(mm);
		130	spin_unlock(&rman->lock);
		131	kfree(rman);
		132	man->priv = NULL;
		133	return 0;
		134	}
		135	spin_unlock(&rman->lock);
		136	return -EBUSY;
		137	}
		138
		139	static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
		140	const char *prefix)
		141	{
		142	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
		143
		144	spin_lock(&rman->lock);
		145	drm_mm_debug_table(&rman->mm, prefix);
		146	spin_unlock(&rman->lock);
		147	}
		148
		149	const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
		150	ttm_bo_man_init,
		151	ttm_bo_man_takedown,
		152	ttm_bo_man_get_node,
		153	ttm_bo_man_put_node,
		154	ttm_bo_man_debug
		155	};
		156	EXPORT_SYMBOL(ttm_bo_manager_func);

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(root)/drivers/video/drm/ttm/ttm_bo_manager.c @ 6104 – Rev 5078