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ttm_bo_manager.c revision 1.1.1.2 
      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 <thellstrom-at-vmware-dot-com>
     29  */
     30 
     31 #include <drm/ttm/ttm_module.h>
     32 #include <drm/ttm/ttm_bo_driver.h>
     33 #include <drm/ttm/ttm_placement.h>
     34 #include <drm/drm_mm.h>
     35 #include <linux/slab.h>
     36 #include <linux/spinlock.h>
     37 #include <linux/module.h>
     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 	enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
     59 	unsigned long lpfn;
     60 	int ret;
     61 
     62 	lpfn = placement->lpfn;
     63 	if (!lpfn)
     64 		lpfn = man->size;
     65 
     66 	node = kzalloc(sizeof(*node), GFP_KERNEL);
     67 	if (!node)
     68 		return -ENOMEM;
     69 
     70 	if (bo->mem.placement & TTM_PL_FLAG_TOPDOWN)
     71 		aflags = DRM_MM_CREATE_TOP;
     72 
     73 	spin_lock(&rman->lock);
     74 	ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
     75 					  mem->page_alignment, 0,
     76 					  placement->fpfn, lpfn,
     77 					  DRM_MM_SEARCH_BEST,
     78 					  aflags);
     79 	spin_unlock(&rman->lock);
     80 
     81 	if (unlikely(ret)) {
     82 		kfree(node);
     83 	} else {
     84 		mem->mm_node = node;
     85 		mem->start = node->start;
     86 	}
     87 
     88 	return 0;
     89 }
     90 
     91 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
     92 				struct ttm_mem_reg *mem)
     93 {
     94 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
     95 
     96 	if (mem->mm_node) {
     97 		spin_lock(&rman->lock);
     98 		drm_mm_remove_node(mem->mm_node);
     99 		spin_unlock(&rman->lock);
    100 
    101 		kfree(mem->mm_node);
    102 		mem->mm_node = NULL;
    103 	}
    104 }
    105 
    106 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
    107 			   unsigned long p_size)
    108 {
    109 	struct ttm_range_manager *rman;
    110 
    111 	rman = kzalloc(sizeof(*rman), GFP_KERNEL);
    112 	if (!rman)
    113 		return -ENOMEM;
    114 
    115 	drm_mm_init(&rman->mm, 0, p_size);
    116 	spin_lock_init(&rman->lock);
    117 	man->priv = rman;
    118 	return 0;
    119 }
    120 
    121 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
    122 {
    123 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
    124 	struct drm_mm *mm = &rman->mm;
    125 
    126 	spin_lock(&rman->lock);
    127 	if (drm_mm_clean(mm)) {
    128 		drm_mm_takedown(mm);
    129 		spin_unlock(&rman->lock);
    130 		kfree(rman);
    131 		man->priv = NULL;
    132 		return 0;
    133 	}
    134 	spin_unlock(&rman->lock);
    135 	return -EBUSY;
    136 }
    137 
    138 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
    139 			     const char *prefix)
    140 {
    141 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
    142 
    143 	spin_lock(&rman->lock);
    144 	drm_mm_debug_table(&rman->mm, prefix);
    145 	spin_unlock(&rman->lock);
    146 }
    147 
    148 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
    149 	ttm_bo_man_init,
    150 	ttm_bo_man_takedown,
    151 	ttm_bo_man_get_node,
    152 	ttm_bo_man_put_node,
    153 	ttm_bo_man_debug
    154 };
    155 EXPORT_SYMBOL(ttm_bo_manager_func);
    156