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,
		53	struct ttm_mem_reg *mem)
		54	{
		55	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
		56	struct drm_mm *mm = &rman->mm;
		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
4112	Serge	65	node = kzalloc(sizeof(*node), GFP_KERNEL);
		66	if (!node)
		67	return -ENOMEM;
		68
4075	Serge	69	spin_lock(&rman->lock);
4112	Serge	70	ret = drm_mm_insert_node_in_range(mm, node, mem->num_pages,
4075	Serge	71	mem->page_alignment,
4112	Serge	72	placement->fpfn, lpfn,
		73	DRM_MM_SEARCH_BEST);
4075	Serge	74	spin_unlock(&rman->lock);
		75
4112	Serge	76	if (unlikely(ret)) {
		77	kfree(node);
		78	} else {
4075	Serge	79	mem->mm_node = node;
		80	mem->start = node->start;
4112	Serge	81	}
		82
4075	Serge	83	return 0;
		84	}
		85
		86	static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
		87	struct ttm_mem_reg *mem)
		88	{
		89	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
		90
		91	if (mem->mm_node) {
		92	spin_lock(&rman->lock);
4112	Serge	93	drm_mm_remove_node(mem->mm_node);
4075	Serge	94	spin_unlock(&rman->lock);
4112	Serge	95
		96	kfree(mem->mm_node);
4075	Serge	97	mem->mm_node = NULL;
		98	}
		99	}
		100
		101	static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
		102	unsigned long p_size)
		103	{
		104	struct ttm_range_manager *rman;
		105
		106	rman = kzalloc(sizeof(*rman), GFP_KERNEL);
		107	if (!rman)
		108	return -ENOMEM;
		109
		110	drm_mm_init(&rman->mm, 0, p_size);
		111	spin_lock_init(&rman->lock);
		112	man->priv = rman;
		113	return 0;
		114	}
		115
		116	static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
		117	{
		118	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
		119	struct drm_mm *mm = &rman->mm;
		120
		121	spin_lock(&rman->lock);
		122	if (drm_mm_clean(mm)) {
		123	drm_mm_takedown(mm);
		124	spin_unlock(&rman->lock);
		125	kfree(rman);
		126	man->priv = NULL;
		127	return 0;
		128	}
		129	spin_unlock(&rman->lock);
		130	return -EBUSY;
		131	}
		132
		133	static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
		134	const char *prefix)
		135	{
		136	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
		137
		138	spin_lock(&rman->lock);
		139	drm_mm_debug_table(&rman->mm, prefix);
		140	spin_unlock(&rman->lock);
		141	}
		142
		143	const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
		144	ttm_bo_man_init,
		145	ttm_bo_man_takedown,
		146	ttm_bo_man_get_node,
		147	ttm_bo_man_put_node,
		148	ttm_bo_man_debug
		149	};
		150	EXPORT_SYMBOL(ttm_bo_manager_func);

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(root)/drivers/video/drm/ttm/ttm_bo_manager.c – Rev 4112