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 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man, 51 struct ttm_buffer_object *bo, 52 const struct ttm_place *place, 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 = place->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 (place->flags & TTM_PL_FLAG_TOPDOWN) 71 aflags = DRM_MM_CREATE_TOP; 72 73 lockmgr(&rman->lock, LK_EXCLUSIVE); 74 ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages, 75 mem->page_alignment, 0, 76 place->fpfn, lpfn, 77 DRM_MM_SEARCH_BEST, 78 aflags); 79 lockmgr(&rman->lock, LK_RELEASE); 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 lockmgr(&rman->lock, LK_EXCLUSIVE); 98 drm_mm_remove_node(mem->mm_node); 99 lockmgr(&rman->lock, LK_RELEASE); 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 = kmalloc(sizeof(*rman), M_DRM, M_ZERO | M_WAITOK); 112 if (!rman) 113 return -ENOMEM; 114 115 drm_mm_init(&rman->mm, 0, p_size); 116 117 lockinit(&rman->lock, "ttmrman", 0, LK_CANRECURSE); 118 man->priv = rman; 119 return 0; 120 } 121 122 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man) 123 { 124 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 125 struct drm_mm *mm = &rman->mm; 126 127 lockmgr(&rman->lock, LK_EXCLUSIVE); 128 if (drm_mm_clean(mm)) { 129 drm_mm_takedown(mm); 130 lockmgr(&rman->lock, LK_RELEASE); 131 kfree(rman); 132 man->priv = NULL; 133 return 0; 134 } 135 lockmgr(&rman->lock, LK_RELEASE); 136 return -EBUSY; 137 } 138 139 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man, 140 const char *prefix) 141 { 142 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 143 144 lockmgr(&rman->lock, LK_EXCLUSIVE); 145 drm_mm_debug_table(&rman->mm, prefix); 146 lockmgr(&rman->lock, LK_RELEASE); 147 } 148 149 const struct ttm_mem_type_manager_func ttm_bo_manager_func = { 150 ttm_bo_man_init, 151 ttm_bo_man_takedown, 152 ttm_bo_man_get_node, 153 ttm_bo_man_put_node, 154 ttm_bo_man_debug 155 }; 156 EXPORT_SYMBOL(ttm_bo_manager_func); 157