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 * $FreeBSD: head/sys/dev/drm2/ttm/ttm_bo_manager.c 247835 2013-03-05 09:49:34Z kib $ 31 */ 32 33 #include <drm/ttm/ttm_module.h> 34 #include <drm/ttm/ttm_bo_driver.h> 35 #include <drm/ttm/ttm_placement.h> 36 #include <drm/drm_mm.h> 37 #include <linux/export.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 struct lock lock; 48 }; 49 50 MALLOC_DEFINE(M_TTM_RMAN, "ttm_rman", "TTM Range Manager"); 51 52 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man, 53 struct ttm_buffer_object *bo, 54 struct ttm_placement *placement, 55 struct ttm_mem_reg *mem) 56 { 57 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 58 struct drm_mm *mm = &rman->mm; 59 struct drm_mm_node *node = NULL; 60 unsigned long lpfn; 61 int ret; 62 63 lpfn = placement->lpfn; 64 if (!lpfn) 65 lpfn = man->size; 66 do { 67 ret = drm_mm_pre_get(mm); 68 if (unlikely(ret)) 69 return ret; 70 71 lockmgr(&rman->lock, LK_EXCLUSIVE); 72 node = drm_mm_search_free_in_range(mm, 73 mem->num_pages, mem->page_alignment, 74 placement->fpfn, lpfn, 1); 75 if (unlikely(node == NULL)) { 76 lockmgr(&rman->lock, LK_RELEASE); 77 return 0; 78 } 79 node = drm_mm_get_block_atomic_range(node, mem->num_pages, 80 mem->page_alignment, 81 placement->fpfn, 82 lpfn); 83 lockmgr(&rman->lock, LK_RELEASE); 84 } while (node == NULL); 85 86 mem->mm_node = node; 87 mem->start = node->start; 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 lockmgr(&rman->lock, LK_EXCLUSIVE); 98 drm_mm_put_block(mem->mm_node); 99 lockmgr(&rman->lock, LK_RELEASE); 100 mem->mm_node = NULL; 101 } 102 } 103 104 static int ttm_bo_man_init(struct ttm_mem_type_manager *man, 105 unsigned long p_size) 106 { 107 struct ttm_range_manager *rman; 108 int ret; 109 110 rman = kmalloc(sizeof(*rman), M_TTM_RMAN, M_ZERO | M_WAITOK); 111 if (!rman) 112 return -ENOMEM; 113 114 ret = drm_mm_init(&rman->mm, 0, p_size); 115 if (ret) { 116 kfree(rman, M_TTM_RMAN); 117 return ret; 118 } 119 120 lockinit(&rman->lock, "ttmrman", 0, LK_CANRECURSE); 121 man->priv = rman; 122 return 0; 123 } 124 125 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man) 126 { 127 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 128 struct drm_mm *mm = &rman->mm; 129 130 lockmgr(&rman->lock, LK_EXCLUSIVE); 131 if (drm_mm_clean(mm)) { 132 drm_mm_takedown(mm); 133 lockmgr(&rman->lock, LK_RELEASE); 134 kfree(rman, M_TTM_RMAN); 135 man->priv = NULL; 136 return 0; 137 } 138 lockmgr(&rman->lock, LK_RELEASE); 139 return -EBUSY; 140 } 141 142 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man, 143 const char *prefix) 144 { 145 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 146 147 lockmgr(&rman->lock, LK_EXCLUSIVE); 148 drm_mm_debug_table(&rman->mm, prefix); 149 lockmgr(&rman->lock, LK_RELEASE); 150 } 151 152 const struct ttm_mem_type_manager_func ttm_bo_manager_func = { 153 ttm_bo_man_init, 154 ttm_bo_man_takedown, 155 ttm_bo_man_get_node, 156 ttm_bo_man_put_node, 157 ttm_bo_man_debug 158 }; 159 EXPORT_SYMBOL(ttm_bo_manager_func); 160