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 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 lockmgr(&rman->lock, LK_EXCLUSIVE); 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 lockmgr(&rman->lock, LK_RELEASE); 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 lockmgr(&rman->lock, LK_RELEASE); 82 } while (node == NULL); 83 84 mem->mm_node = node; 85 mem->start = node->start; 86 return 0; 87 } 88 89 static 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 lockmgr(&rman->lock, LK_EXCLUSIVE); 96 drm_mm_put_block(mem->mm_node); 97 lockmgr(&rman->lock, LK_RELEASE); 98 mem->mm_node = NULL; 99 } 100 } 101 102 static int ttm_bo_man_init(struct ttm_mem_type_manager *man, 103 unsigned long p_size) 104 { 105 struct ttm_range_manager *rman; 106 107 rman = kmalloc(sizeof(*rman), M_DRM, M_ZERO | M_WAITOK); 108 if (!rman) 109 return -ENOMEM; 110 111 drm_mm_init(&rman->mm, 0, p_size); 112 113 lockinit(&rman->lock, "ttmrman", 0, LK_CANRECURSE); 114 man->priv = rman; 115 return 0; 116 } 117 118 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man) 119 { 120 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 121 struct drm_mm *mm = &rman->mm; 122 123 lockmgr(&rman->lock, LK_EXCLUSIVE); 124 if (drm_mm_clean(mm)) { 125 drm_mm_takedown(mm); 126 lockmgr(&rman->lock, LK_RELEASE); 127 kfree(rman); 128 man->priv = NULL; 129 return 0; 130 } 131 lockmgr(&rman->lock, LK_RELEASE); 132 return -EBUSY; 133 } 134 135 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man, 136 const char *prefix) 137 { 138 struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; 139 140 lockmgr(&rman->lock, LK_EXCLUSIVE); 141 drm_mm_debug_table(&rman->mm, prefix); 142 lockmgr(&rman->lock, LK_RELEASE); 143 } 144 145 const struct ttm_mem_type_manager_func ttm_bo_manager_func = { 146 ttm_bo_man_init, 147 ttm_bo_man_takedown, 148 ttm_bo_man_get_node, 149 ttm_bo_man_put_node, 150 ttm_bo_man_debug 151 }; 152 EXPORT_SYMBOL(ttm_bo_manager_func); 153