1 /* 2 * Copyright 2016 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Christian König 23 */ 24 25 #include <drm/ttm/ttm_range_manager.h> 26 27 #include "amdgpu.h" 28 29 struct amdgpu_gtt_node { 30 struct ttm_buffer_object *tbo; 31 struct ttm_range_mgr_node base; 32 }; 33 34 static inline struct amdgpu_gtt_mgr * 35 to_gtt_mgr(struct ttm_resource_manager *man) 36 { 37 return container_of(man, struct amdgpu_gtt_mgr, manager); 38 } 39 40 static inline struct amdgpu_gtt_node * 41 to_amdgpu_gtt_node(struct ttm_resource *res) 42 { 43 return container_of(res, struct amdgpu_gtt_node, base.base); 44 } 45 46 /** 47 * DOC: mem_info_gtt_total 48 * 49 * The amdgpu driver provides a sysfs API for reporting current total size of 50 * the GTT. 51 * The file mem_info_gtt_total is used for this, and returns the total size of 52 * the GTT block, in bytes 53 */ 54 static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev, 55 struct device_attribute *attr, 56 char *buf) 57 { 58 struct drm_device *ddev = dev_get_drvdata(dev); 59 struct amdgpu_device *adev = drm_to_adev(ddev); 60 struct ttm_resource_manager *man; 61 62 man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT); 63 return sysfs_emit(buf, "%llu\n", man->size * PAGE_SIZE); 64 } 65 66 /** 67 * DOC: mem_info_gtt_used 68 * 69 * The amdgpu driver provides a sysfs API for reporting current total amount of 70 * used GTT. 71 * The file mem_info_gtt_used is used for this, and returns the current used 72 * size of the GTT block, in bytes 73 */ 74 static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev, 75 struct device_attribute *attr, 76 char *buf) 77 { 78 struct drm_device *ddev = dev_get_drvdata(dev); 79 struct amdgpu_device *adev = drm_to_adev(ddev); 80 81 return sysfs_emit(buf, "%llu\n", amdgpu_gtt_mgr_usage(&adev->mman.gtt_mgr)); 82 } 83 84 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO, 85 amdgpu_mem_info_gtt_total_show, NULL); 86 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO, 87 amdgpu_mem_info_gtt_used_show, NULL); 88 89 static struct attribute *amdgpu_gtt_mgr_attributes[] = { 90 &dev_attr_mem_info_gtt_total.attr, 91 &dev_attr_mem_info_gtt_used.attr, 92 NULL 93 }; 94 95 const struct attribute_group amdgpu_gtt_mgr_attr_group = { 96 .attrs = amdgpu_gtt_mgr_attributes 97 }; 98 99 /** 100 * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space 101 * 102 * @res: the mem object to check 103 * 104 * Check if a mem object has already address space allocated. 105 */ 106 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *res) 107 { 108 struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(res); 109 110 return drm_mm_node_allocated(&node->base.mm_nodes[0]); 111 } 112 113 /** 114 * amdgpu_gtt_mgr_new - allocate a new node 115 * 116 * @man: TTM memory type manager 117 * @tbo: TTM BO we need this range for 118 * @place: placement flags and restrictions 119 * @res: the resulting mem object 120 * 121 * Dummy, allocate the node but no space for it yet. 122 */ 123 static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man, 124 struct ttm_buffer_object *tbo, 125 const struct ttm_place *place, 126 struct ttm_resource **res) 127 { 128 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 129 uint32_t num_pages = PFN_UP(tbo->base.size); 130 struct amdgpu_gtt_node *node; 131 int r; 132 133 if (!(place->flags & TTM_PL_FLAG_TEMPORARY) && 134 atomic64_add_return(num_pages, &mgr->used) > man->size) { 135 atomic64_sub(num_pages, &mgr->used); 136 return -ENOSPC; 137 } 138 139 node = kzalloc(struct_size(node, base.mm_nodes, 1), GFP_KERNEL); 140 if (!node) { 141 r = -ENOMEM; 142 goto err_out; 143 } 144 145 node->tbo = tbo; 146 ttm_resource_init(tbo, place, &node->base.base); 147 148 if (place->lpfn) { 149 spin_lock(&mgr->lock); 150 r = drm_mm_insert_node_in_range(&mgr->mm, 151 &node->base.mm_nodes[0], 152 num_pages, tbo->page_alignment, 153 0, place->fpfn, place->lpfn, 154 DRM_MM_INSERT_BEST); 155 spin_unlock(&mgr->lock); 156 if (unlikely(r)) 157 goto err_free; 158 159 node->base.base.start = node->base.mm_nodes[0].start; 160 } else { 161 node->base.mm_nodes[0].start = 0; 162 node->base.mm_nodes[0].size = node->base.base.num_pages; 163 node->base.base.start = AMDGPU_BO_INVALID_OFFSET; 164 } 165 166 *res = &node->base.base; 167 return 0; 168 169 err_free: 170 ttm_resource_fini(man, &node->base.base); 171 kfree(node); 172 173 err_out: 174 if (!(place->flags & TTM_PL_FLAG_TEMPORARY)) 175 atomic64_sub(num_pages, &mgr->used); 176 177 return r; 178 } 179 180 /** 181 * amdgpu_gtt_mgr_del - free ranges 182 * 183 * @man: TTM memory type manager 184 * @res: TTM memory object 185 * 186 * Free the allocated GTT again. 187 */ 188 static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man, 189 struct ttm_resource *res) 190 { 191 struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(res); 192 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 193 194 spin_lock(&mgr->lock); 195 if (drm_mm_node_allocated(&node->base.mm_nodes[0])) 196 drm_mm_remove_node(&node->base.mm_nodes[0]); 197 spin_unlock(&mgr->lock); 198 199 if (!(res->placement & TTM_PL_FLAG_TEMPORARY)) 200 atomic64_sub(res->num_pages, &mgr->used); 201 202 ttm_resource_fini(man, res); 203 kfree(node); 204 } 205 206 /** 207 * amdgpu_gtt_mgr_usage - return usage of GTT domain 208 * 209 * @mgr: amdgpu_gtt_mgr pointer 210 * 211 * Return how many bytes are used in the GTT domain 212 */ 213 uint64_t amdgpu_gtt_mgr_usage(struct amdgpu_gtt_mgr *mgr) 214 { 215 return atomic64_read(&mgr->used) * PAGE_SIZE; 216 } 217 218 /** 219 * amdgpu_gtt_mgr_recover - re-init gart 220 * 221 * @mgr: amdgpu_gtt_mgr pointer 222 * 223 * Re-init the gart for each known BO in the GTT. 224 */ 225 void amdgpu_gtt_mgr_recover(struct amdgpu_gtt_mgr *mgr) 226 { 227 struct amdgpu_gtt_node *node; 228 struct drm_mm_node *mm_node; 229 struct amdgpu_device *adev; 230 231 adev = container_of(mgr, typeof(*adev), mman.gtt_mgr); 232 spin_lock(&mgr->lock); 233 drm_mm_for_each_node(mm_node, &mgr->mm) { 234 node = container_of(mm_node, typeof(*node), base.mm_nodes[0]); 235 amdgpu_ttm_recover_gart(node->tbo); 236 } 237 spin_unlock(&mgr->lock); 238 239 amdgpu_gart_invalidate_tlb(adev); 240 } 241 242 /** 243 * amdgpu_gtt_mgr_debug - dump VRAM table 244 * 245 * @man: TTM memory type manager 246 * @printer: DRM printer to use 247 * 248 * Dump the table content using printk. 249 */ 250 static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man, 251 struct drm_printer *printer) 252 { 253 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 254 255 spin_lock(&mgr->lock); 256 drm_mm_print(&mgr->mm, printer); 257 spin_unlock(&mgr->lock); 258 259 drm_printf(printer, "man size:%llu pages, gtt used:%llu pages\n", 260 man->size, atomic64_read(&mgr->used)); 261 } 262 263 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = { 264 .alloc = amdgpu_gtt_mgr_new, 265 .free = amdgpu_gtt_mgr_del, 266 .debug = amdgpu_gtt_mgr_debug 267 }; 268 269 /** 270 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM 271 * 272 * @adev: amdgpu_device pointer 273 * @gtt_size: maximum size of GTT 274 * 275 * Allocate and initialize the GTT manager. 276 */ 277 int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size) 278 { 279 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr; 280 struct ttm_resource_manager *man = &mgr->manager; 281 uint64_t start, size; 282 283 man->use_tt = true; 284 man->func = &amdgpu_gtt_mgr_func; 285 286 ttm_resource_manager_init(man, &adev->mman.bdev, 287 gtt_size >> PAGE_SHIFT); 288 289 start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS; 290 size = (adev->gmc.gart_size >> PAGE_SHIFT) - start; 291 drm_mm_init(&mgr->mm, start, size); 292 spin_lock_init(&mgr->lock); 293 atomic64_set(&mgr->used, 0); 294 295 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager); 296 ttm_resource_manager_set_used(man, true); 297 return 0; 298 } 299 300 /** 301 * amdgpu_gtt_mgr_fini - free and destroy GTT manager 302 * 303 * @adev: amdgpu_device pointer 304 * 305 * Destroy and free the GTT manager, returns -EBUSY if ranges are still 306 * allocated inside it. 307 */ 308 void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev) 309 { 310 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr; 311 struct ttm_resource_manager *man = &mgr->manager; 312 int ret; 313 314 ttm_resource_manager_set_used(man, false); 315 316 ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man); 317 if (ret) 318 return; 319 320 spin_lock(&mgr->lock); 321 drm_mm_takedown(&mgr->mm); 322 spin_unlock(&mgr->lock); 323 324 ttm_resource_manager_cleanup(man); 325 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL); 326 } 327