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 <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <dev/drm2/drmP.h> 35 #include <dev/drm2/ttm/ttm_module.h> 36 #include <dev/drm2/ttm/ttm_bo_driver.h> 37 #include <dev/drm2/ttm/ttm_placement.h> 38 #include <dev/drm2/drm_mm.h> 39 40 /** 41 * Currently we use a spinlock for the lock, but a mutex *may* be 42 * more appropriate to reduce scheduling latency if the range manager 43 * ends up with very fragmented allocation patterns. 44 */ 45 46 struct ttm_range_manager { 47 struct drm_mm mm; 48 struct mtx lock; 49 }; 50 51 MALLOC_DEFINE(M_TTM_RMAN, "ttm_rman", "TTM Range Manager"); 52 53 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man, 54 struct ttm_buffer_object *bo, 55 struct ttm_placement *placement, 56 struct ttm_mem_reg *mem) 57 { 58 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 59 struct drm_mm *mm = &rman->mm; 60 struct drm_mm_node *node = NULL; 61 unsigned long lpfn; 62 int ret; 63 64 lpfn = placement->lpfn; 65 if (!lpfn) 66 lpfn = man->size; 67 do { 68 ret = drm_mm_pre_get(mm); 69 if (unlikely(ret)) 70 return ret; 71 72 mtx_lock(&rman->lock); 73 node = drm_mm_search_free_in_range(mm, 74 mem->num_pages, mem->page_alignment, 75 placement->fpfn, lpfn, 1); 76 if (unlikely(node == NULL)) { 77 mtx_unlock(&rman->lock); 78 return 0; 79 } 80 node = drm_mm_get_block_atomic_range(node, mem->num_pages, 81 mem->page_alignment, 82 placement->fpfn, 83 lpfn); 84 mtx_unlock(&rman->lock); 85 } while (node == NULL); 86 87 mem->mm_node = node; 88 mem->start = node->start; 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 mtx_lock(&rman->lock); 99 drm_mm_put_block(mem->mm_node); 100 mtx_unlock(&rman->lock); 101 mem->mm_node = NULL; 102 } 103 } 104 105 static int ttm_bo_man_init(struct ttm_mem_type_manager *man, 106 unsigned long p_size) 107 { 108 struct ttm_range_manager *rman; 109 int ret; 110 111 rman = malloc(sizeof(*rman), M_TTM_RMAN, M_ZERO | M_WAITOK); 112 ret = drm_mm_init(&rman->mm, 0, p_size); 113 if (ret) { 114 free(rman, M_TTM_RMAN); 115 return ret; 116 } 117 118 mtx_init(&rman->lock, "ttmrman", NULL, MTX_DEF); 119 man->priv = rman; 120 return 0; 121 } 122 123 static 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 mtx_lock(&rman->lock); 129 if (drm_mm_clean(mm)) { 130 drm_mm_takedown(mm); 131 mtx_unlock(&rman->lock); 132 mtx_destroy(&rman->lock); 133 free(rman, M_TTM_RMAN); 134 man->priv = NULL; 135 return 0; 136 } 137 mtx_unlock(&rman->lock); 138 return -EBUSY; 139 } 140 141 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man, 142 const char *prefix) 143 { 144 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 145 146 mtx_lock(&rman->lock); 147 drm_mm_debug_table(&rman->mm, prefix); 148 mtx_unlock(&rman->lock); 149 } 150 151 const struct ttm_mem_type_manager_func ttm_bo_manager_func = { 152 ttm_bo_man_init, 153 ttm_bo_man_takedown, 154 ttm_bo_man_get_node, 155 ttm_bo_man_put_node, 156 ttm_bo_man_debug 157 }; 158