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.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 PFN_UP(node->base.size), 87 bo->page_alignment, 0, 88 place->fpfn, lpfn, mode); 89 spin_unlock(&rman->lock); 90 91 if (unlikely(ret)) { 92 ttm_resource_fini(man, &node->base); 93 kfree(node); 94 return ret; 95 } 96 97 node->base.start = node->mm_nodes[0].start; 98 *res = &node->base; 99 return 0; 100 } 101 102 static void ttm_range_man_free(struct ttm_resource_manager *man, 103 struct ttm_resource *res) 104 { 105 struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res); 106 struct ttm_range_manager *rman = to_range_manager(man); 107 108 spin_lock(&rman->lock); 109 drm_mm_remove_node(&node->mm_nodes[0]); 110 spin_unlock(&rman->lock); 111 112 ttm_resource_fini(man, res); 113 kfree(node); 114 } 115 116 static bool ttm_range_man_intersects(struct ttm_resource_manager *man, 117 struct ttm_resource *res, 118 const struct ttm_place *place, 119 size_t size) 120 { 121 struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0]; 122 u32 num_pages = PFN_UP(size); 123 124 /* Don't evict BOs outside of the requested placement range */ 125 if (place->fpfn >= (node->start + num_pages) || 126 (place->lpfn && place->lpfn <= node->start)) 127 return false; 128 129 return true; 130 } 131 132 static bool ttm_range_man_compatible(struct ttm_resource_manager *man, 133 struct ttm_resource *res, 134 const struct ttm_place *place, 135 size_t size) 136 { 137 struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0]; 138 u32 num_pages = PFN_UP(size); 139 140 if (node->start < place->fpfn || 141 (place->lpfn && (node->start + num_pages) > place->lpfn)) 142 return false; 143 144 return true; 145 } 146 147 static void ttm_range_man_debug(struct ttm_resource_manager *man, 148 struct drm_printer *printer) 149 { 150 struct ttm_range_manager *rman = to_range_manager(man); 151 152 spin_lock(&rman->lock); 153 drm_mm_print(&rman->mm, printer); 154 spin_unlock(&rman->lock); 155 } 156 157 static const struct ttm_resource_manager_func ttm_range_manager_func = { 158 .alloc = ttm_range_man_alloc, 159 .free = ttm_range_man_free, 160 .intersects = ttm_range_man_intersects, 161 .compatible = ttm_range_man_compatible, 162 .debug = ttm_range_man_debug 163 }; 164 165 /** 166 * ttm_range_man_init_nocheck - Initialise a generic range manager for the 167 * selected memory type. 168 * 169 * @bdev: ttm device 170 * @type: memory manager type 171 * @use_tt: if the memory manager uses tt 172 * @p_size: size of area to be managed in pages. 173 * 174 * The range manager is installed for this device in the type slot. 175 * 176 * Return: %0 on success or a negative error code on failure 177 */ 178 int ttm_range_man_init_nocheck(struct ttm_device *bdev, 179 unsigned type, bool use_tt, 180 unsigned long p_size) 181 { 182 struct ttm_resource_manager *man; 183 struct ttm_range_manager *rman; 184 185 rman = kzalloc(sizeof(*rman), GFP_KERNEL); 186 if (!rman) 187 return -ENOMEM; 188 189 man = &rman->manager; 190 man->use_tt = use_tt; 191 192 man->func = &ttm_range_manager_func; 193 194 ttm_resource_manager_init(man, bdev, p_size); 195 196 drm_mm_init(&rman->mm, 0, p_size); 197 spin_lock_init(&rman->lock); 198 199 ttm_set_driver_manager(bdev, type, &rman->manager); 200 ttm_resource_manager_set_used(man, true); 201 return 0; 202 } 203 EXPORT_SYMBOL(ttm_range_man_init_nocheck); 204 205 /** 206 * ttm_range_man_fini_nocheck - Remove the generic range manager from a slot 207 * and tear it down. 208 * 209 * @bdev: ttm device 210 * @type: memory manager type 211 * 212 * Return: %0 on success or a negative error code on failure 213 */ 214 int ttm_range_man_fini_nocheck(struct ttm_device *bdev, 215 unsigned type) 216 { 217 struct ttm_resource_manager *man = ttm_manager_type(bdev, type); 218 struct ttm_range_manager *rman = to_range_manager(man); 219 struct drm_mm *mm = &rman->mm; 220 int ret; 221 222 if (!man) 223 return 0; 224 225 ttm_resource_manager_set_used(man, false); 226 227 ret = ttm_resource_manager_evict_all(bdev, man); 228 if (ret) 229 return ret; 230 231 spin_lock(&rman->lock); 232 drm_mm_takedown(mm); 233 spin_unlock(&rman->lock); 234 235 ttm_resource_manager_cleanup(man); 236 ttm_set_driver_manager(bdev, type, NULL); 237 kfree(rman); 238 return 0; 239 } 240 EXPORT_SYMBOL(ttm_range_man_fini_nocheck); 241