1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */ 2 /************************************************************************** 3 * 4 * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA 5 * All Rights Reserved. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the 9 * "Software"), to deal in the Software without restriction, including 10 * without limitation the rights to use, copy, modify, merge, publish, 11 * distribute, sub license, and/or sell copies of the Software, and to 12 * permit persons to whom the Software is furnished to do so, subject to 13 * the following conditions: 14 * 15 * The above copyright notice and this permission notice (including the 16 * next paragraph) shall be included in all copies or substantial portions 17 * of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 25 * USE OR OTHER DEALINGS IN THE SOFTWARE. 26 * 27 **************************************************************************/ 28 /* 29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 30 */ 31 32 #include <drm/ttm/ttm_device.h> 33 #include <drm/ttm/ttm_placement.h> 34 #include <drm/ttm/ttm_range_manager.h> 35 #include <drm/ttm/ttm_bo_api.h> 36 #include <drm/drm_mm.h> 37 #include <linux/slab.h> 38 #include <linux/spinlock.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 ttm_resource_manager manager; 48 struct drm_mm mm; 49 spinlock_t lock; 50 }; 51 52 static inline struct ttm_range_manager * 53 to_range_manager(struct ttm_resource_manager *man) 54 { 55 return container_of(man, struct ttm_range_manager, manager); 56 } 57 58 static int ttm_range_man_alloc(struct ttm_resource_manager *man, 59 struct ttm_buffer_object *bo, 60 const struct ttm_place *place, 61 struct ttm_resource **res) 62 { 63 struct ttm_range_manager *rman = to_range_manager(man); 64 struct ttm_range_mgr_node *node; 65 struct drm_mm *mm = &rman->mm; 66 enum drm_mm_insert_mode mode; 67 unsigned long lpfn; 68 int ret; 69 70 lpfn = place->lpfn; 71 if (!lpfn) 72 lpfn = man->size; 73 74 node = kzalloc(struct_size(node, mm_nodes, 1), GFP_KERNEL); 75 if (!node) 76 return -ENOMEM; 77 78 mode = DRM_MM_INSERT_BEST; 79 if (place->flags & TTM_PL_FLAG_TOPDOWN) 80 mode = DRM_MM_INSERT_HIGH; 81 82 ttm_resource_init(bo, place, &node->base); 83 84 spin_lock(&rman->lock); 85 ret = drm_mm_insert_node_in_range(mm, &node->mm_nodes[0], 86 node->base.num_pages, 87 bo->page_alignment, 0, 88 place->fpfn, lpfn, mode); 89 spin_unlock(&rman->lock); 90 91 if (unlikely(ret)) { 92 kfree(node); 93 return ret; 94 } 95 96 node->base.start = node->mm_nodes[0].start; 97 *res = &node->base; 98 return 0; 99 } 100 101 static void ttm_range_man_free(struct ttm_resource_manager *man, 102 struct ttm_resource *res) 103 { 104 struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res); 105 struct ttm_range_manager *rman = to_range_manager(man); 106 107 spin_lock(&rman->lock); 108 drm_mm_remove_node(&node->mm_nodes[0]); 109 spin_unlock(&rman->lock); 110 111 kfree(node); 112 } 113 114 static void ttm_range_man_debug(struct ttm_resource_manager *man, 115 struct drm_printer *printer) 116 { 117 struct ttm_range_manager *rman = to_range_manager(man); 118 119 spin_lock(&rman->lock); 120 drm_mm_print(&rman->mm, printer); 121 spin_unlock(&rman->lock); 122 } 123 124 static const struct ttm_resource_manager_func ttm_range_manager_func = { 125 .alloc = ttm_range_man_alloc, 126 .free = ttm_range_man_free, 127 .debug = ttm_range_man_debug 128 }; 129 130 /** 131 * ttm_range_man_init 132 * 133 * @bdev: ttm device 134 * @type: memory manager type 135 * @use_tt: if the memory manager uses tt 136 * @p_size: size of area to be managed in pages. 137 * 138 * Initialise a generic range manager for the selected memory type. 139 * The range manager is installed for this device in the type slot. 140 */ 141 int ttm_range_man_init(struct ttm_device *bdev, 142 unsigned type, bool use_tt, 143 unsigned long p_size) 144 { 145 struct ttm_resource_manager *man; 146 struct ttm_range_manager *rman; 147 148 rman = kzalloc(sizeof(*rman), GFP_KERNEL); 149 if (!rman) 150 return -ENOMEM; 151 152 man = &rman->manager; 153 man->use_tt = use_tt; 154 155 man->func = &ttm_range_manager_func; 156 157 ttm_resource_manager_init(man, p_size); 158 159 drm_mm_init(&rman->mm, 0, p_size); 160 spin_lock_init(&rman->lock); 161 162 ttm_set_driver_manager(bdev, type, &rman->manager); 163 ttm_resource_manager_set_used(man, true); 164 return 0; 165 } 166 EXPORT_SYMBOL(ttm_range_man_init); 167 168 /** 169 * ttm_range_man_fini 170 * 171 * @bdev: ttm device 172 * @type: memory manager type 173 * 174 * Remove the generic range manager from a slot and tear it down. 175 */ 176 int ttm_range_man_fini(struct ttm_device *bdev, 177 unsigned type) 178 { 179 struct ttm_resource_manager *man = ttm_manager_type(bdev, type); 180 struct ttm_range_manager *rman = to_range_manager(man); 181 struct drm_mm *mm = &rman->mm; 182 int ret; 183 184 ttm_resource_manager_set_used(man, false); 185 186 ret = ttm_resource_manager_evict_all(bdev, man); 187 if (ret) 188 return ret; 189 190 spin_lock(&rman->lock); 191 drm_mm_clean(mm); 192 drm_mm_takedown(mm); 193 spin_unlock(&rman->lock); 194 195 ttm_resource_manager_cleanup(man); 196 ttm_set_driver_manager(bdev, type, NULL); 197 kfree(rman); 198 return 0; 199 } 200 EXPORT_SYMBOL(ttm_range_man_fini); 201