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 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; 58 enum drm_mm_insert_mode mode; 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 mode = DRM_MM_INSERT_BEST; 71 if (place->flags & TTM_PL_FLAG_TOPDOWN) 72 mode = DRM_MM_INSERT_HIGH; 73 74 lockmgr(&rman->lock, LK_EXCLUSIVE); 75 ret = drm_mm_insert_node_in_range(mm, node, 76 mem->num_pages, 77 mem->page_alignment, 0, 78 place->fpfn, lpfn, mode); 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 = kzalloc(sizeof(*rman), GFP_KERNEL); 112 if (!rman) 113 return -ENOMEM; 114 115 drm_mm_init(&rman->mm, 0, p_size); 116 lockinit(&rman->lock, "ttmrman", 0, 0); 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 lockmgr(&rman->lock, LK_EXCLUSIVE); 127 if (drm_mm_clean(mm)) { 128 drm_mm_takedown(mm); 129 lockmgr(&rman->lock, LK_RELEASE); 130 kfree(rman); 131 man->priv = NULL; 132 return 0; 133 } 134 lockmgr(&rman->lock, LK_RELEASE); 135 return -EBUSY; 136 } 137 138 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man, 139 struct drm_printer *printer) 140 { 141 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 142 143 lockmgr(&rman->lock, LK_EXCLUSIVE); 144 drm_mm_print(&rman->mm, printer); 145 lockmgr(&rman->lock, LK_RELEASE); 146 } 147 148 const struct ttm_mem_type_manager_func ttm_bo_manager_func = { 149 .init = ttm_bo_man_init, 150 .takedown = ttm_bo_man_takedown, 151 .get_node = ttm_bo_man_get_node, 152 .put_node = ttm_bo_man_put_node, 153 .debug = ttm_bo_man_debug 154 }; 155 EXPORT_SYMBOL(ttm_bo_manager_func); 156