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4075 Serge 1
/**************************************************************************
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 *
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 * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
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 * All Rights Reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the
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 * "Software"), to deal in the Software without restriction, including
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 * without limitation the rights to use, copy, modify, merge, publish,
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 * distribute, sub license, and/or sell copies of the Software, and to
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 * permit persons to whom the Software is furnished to do so, subject to
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 * the following conditions:
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 *
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 * The above copyright notice and this permission notice (including the
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 * next paragraph) shall be included in all copies or substantial portions
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 * of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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 * USE OR OTHER DEALINGS IN THE SOFTWARE.
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 *
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 **************************************************************************/
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/*
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 * Authors: Thomas Hellstrom 
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 */
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#include 
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#include 
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#include 
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#include 
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#include 
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#include 
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#include 
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/**
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 * Currently we use a spinlock for the lock, but a mutex *may* be
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 * more appropriate to reduce scheduling latency if the range manager
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 * ends up with very fragmented allocation patterns.
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 */
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struct ttm_range_manager {
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	struct drm_mm mm;
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	spinlock_t lock;
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};
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static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
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			       struct ttm_buffer_object *bo,
5271 serge 52
			       const struct ttm_place *place,
4075 Serge 53
			       struct ttm_mem_reg *mem)
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{
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	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
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	struct drm_mm *mm = &rman->mm;
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	struct drm_mm_node *node = NULL;
5271 serge 58
	enum drm_mm_search_flags sflags = DRM_MM_SEARCH_BEST;
5078 serge 59
	enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
4075 Serge 60
	unsigned long lpfn;
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	int ret;
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5271 serge 63
	lpfn = place->lpfn;
4075 Serge 64
	if (!lpfn)
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		lpfn = man->size;
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4112 Serge 67
	node = kzalloc(sizeof(*node), GFP_KERNEL);
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	if (!node)
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		return -ENOMEM;
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5271 serge 71
	if (place->flags & TTM_PL_FLAG_TOPDOWN) {
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		sflags = DRM_MM_SEARCH_BELOW;
5078 serge 73
		aflags = DRM_MM_CREATE_TOP;
5271 serge 74
	}
5078 serge 75
 
6104 serge 76
	spin_lock(&rman->lock);
5078 serge 77
	ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
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					  mem->page_alignment, 0,
5271 serge 79
					  place->fpfn, lpfn,
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					  sflags, aflags);
6104 serge 81
	spin_unlock(&rman->lock);
4075 Serge 82
 
4112 Serge 83
	if (unlikely(ret)) {
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		kfree(node);
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	} else {
6104 serge 86
		mem->mm_node = node;
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		mem->start = node->start;
4112 Serge 88
	}
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4075 Serge 90
	return 0;
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}
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static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
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				struct ttm_mem_reg *mem)
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{
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	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
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	if (mem->mm_node) {
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		spin_lock(&rman->lock);
4112 Serge 100
		drm_mm_remove_node(mem->mm_node);
4075 Serge 101
		spin_unlock(&rman->lock);
4112 Serge 102
 
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		kfree(mem->mm_node);
4075 Serge 104
		mem->mm_node = NULL;
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	}
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}
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static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
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			   unsigned long p_size)
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{
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	struct ttm_range_manager *rman;
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	rman = kzalloc(sizeof(*rman), GFP_KERNEL);
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	if (!rman)
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		return -ENOMEM;
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	drm_mm_init(&rman->mm, 0, p_size);
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	spin_lock_init(&rman->lock);
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	man->priv = rman;
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	return 0;
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}
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static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
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{
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	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
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	struct drm_mm *mm = &rman->mm;
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	spin_lock(&rman->lock);
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	if (drm_mm_clean(mm)) {
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		drm_mm_takedown(mm);
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		spin_unlock(&rman->lock);
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		kfree(rman);
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		man->priv = NULL;
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		return 0;
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	}
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	spin_unlock(&rman->lock);
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	return -EBUSY;
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}
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static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
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			     const char *prefix)
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{
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	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
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	spin_lock(&rman->lock);
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	drm_mm_debug_table(&rman->mm, prefix);
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	spin_unlock(&rman->lock);
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}
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const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
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	ttm_bo_man_init,
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	ttm_bo_man_takedown,
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	ttm_bo_man_get_node,
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	ttm_bo_man_put_node,
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	ttm_bo_man_debug
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};
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EXPORT_SYMBOL(ttm_bo_manager_func);