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 "ttm/ttm_module.h" 32#include "ttm/ttm_bo_driver.h" 33#include "ttm/ttm_placement.h" 34#include "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 45struct ttm_range_manager { 46 struct drm_mm mm; 47 spinlock_t lock; 48}; 49 50static 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 do { 65 ret = drm_mm_pre_get(mm); 66 if (unlikely(ret)) 67 return ret; 68 69 spin_lock(&rman->lock); 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)) { 74 spin_unlock(&rman->lock); 75 return 0; 76 } 77 node = drm_mm_get_block_atomic_range(node, mem->num_pages, 78 mem->page_alignment, 79 placement->fpfn, 80 lpfn); 81 spin_unlock(&rman->lock); 82 } while (node == NULL); 83 84 mem->mm_node = node; 85 mem->start = node->start; 86 return 0; 87} 88 89static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man, 90 struct ttm_mem_reg *mem) 91{ 92 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 93 94 if (mem->mm_node) { 95 spin_lock(&rman->lock); 96 drm_mm_put_block(mem->mm_node); 97 spin_unlock(&rman->lock); 98 mem->mm_node = NULL; 99 } 100} 101 102static int ttm_bo_man_init(struct ttm_mem_type_manager *man, 103 unsigned long p_size) 104{ 105 struct ttm_range_manager *rman; 106 int ret; 107 108 rman = kzalloc(sizeof(*rman), GFP_KERNEL); 109 if (!rman) 110 return -ENOMEM; 111 112 ret = drm_mm_init(&rman->mm, 0, p_size); 113 if (ret) { 114 kfree(rman); 115 return ret; 116 } 117 118 spin_lock_init(&rman->lock); 119 man->priv = rman; 120 return 0; 121} 122 123static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man) 124{ 125 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 126 struct drm_mm *mm = &rman->mm; 127 128 spin_lock(&rman->lock); 129 if (drm_mm_clean(mm)) { 130 drm_mm_takedown(mm); 131 spin_unlock(&rman->lock); 132 kfree(rman); 133 man->priv = NULL; 134 return 0; 135 } 136 spin_unlock(&rman->lock); 137 return -EBUSY; 138} 139 140static void ttm_bo_man_debug(struct ttm_mem_type_manager *man, 141 const char *prefix) 142{ 143 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 144 145 spin_lock(&rman->lock); 146 drm_mm_debug_table(&rman->mm, prefix); 147 spin_unlock(&rman->lock); 148} 149 150const 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}; 157EXPORT_SYMBOL(ttm_bo_manager_func); 158