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 "amdgpu.h" 26 27 static inline struct amdgpu_gtt_mgr * 28 to_gtt_mgr(struct ttm_resource_manager *man) 29 { 30 return container_of(man, struct amdgpu_gtt_mgr, manager); 31 } 32 33 struct amdgpu_gtt_node { 34 struct drm_mm_node node; 35 struct ttm_buffer_object *tbo; 36 }; 37 38 /** 39 * DOC: mem_info_gtt_total 40 * 41 * The amdgpu driver provides a sysfs API for reporting current total size of 42 * the GTT. 43 * The file mem_info_gtt_total is used for this, and returns the total size of 44 * the GTT block, in bytes 45 */ 46 static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev, 47 struct device_attribute *attr, 48 char *buf) 49 { 50 struct drm_device *ddev = dev_get_drvdata(dev); 51 struct amdgpu_device *adev = drm_to_adev(ddev); 52 struct ttm_resource_manager *man; 53 54 man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT); 55 return sysfs_emit(buf, "%llu\n", man->size * PAGE_SIZE); 56 } 57 58 /** 59 * DOC: mem_info_gtt_used 60 * 61 * The amdgpu driver provides a sysfs API for reporting current total amount of 62 * used GTT. 63 * The file mem_info_gtt_used is used for this, and returns the current used 64 * size of the GTT block, in bytes 65 */ 66 static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev, 67 struct device_attribute *attr, 68 char *buf) 69 { 70 struct drm_device *ddev = dev_get_drvdata(dev); 71 struct amdgpu_device *adev = drm_to_adev(ddev); 72 struct ttm_resource_manager *man; 73 74 man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT); 75 return sysfs_emit(buf, "%llu\n", amdgpu_gtt_mgr_usage(man)); 76 } 77 78 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO, 79 amdgpu_mem_info_gtt_total_show, NULL); 80 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO, 81 amdgpu_mem_info_gtt_used_show, NULL); 82 83 /** 84 * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space 85 * 86 * @mem: the mem object to check 87 * 88 * Check if a mem object has already address space allocated. 89 */ 90 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *mem) 91 { 92 return mem->mm_node != NULL; 93 } 94 95 /** 96 * amdgpu_gtt_mgr_new - allocate a new node 97 * 98 * @man: TTM memory type manager 99 * @tbo: TTM BO we need this range for 100 * @place: placement flags and restrictions 101 * @mem: the resulting mem object 102 * 103 * Dummy, allocate the node but no space for it yet. 104 */ 105 static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man, 106 struct ttm_buffer_object *tbo, 107 const struct ttm_place *place, 108 struct ttm_resource *mem) 109 { 110 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 111 struct amdgpu_gtt_node *node; 112 int r; 113 114 spin_lock(&mgr->lock); 115 if ((&tbo->mem == mem || tbo->mem.mem_type != TTM_PL_TT) && 116 atomic64_read(&mgr->available) < mem->num_pages) { 117 spin_unlock(&mgr->lock); 118 return -ENOSPC; 119 } 120 atomic64_sub(mem->num_pages, &mgr->available); 121 spin_unlock(&mgr->lock); 122 123 if (!place->lpfn) { 124 mem->mm_node = NULL; 125 mem->start = AMDGPU_BO_INVALID_OFFSET; 126 return 0; 127 } 128 129 node = kzalloc(sizeof(*node), GFP_KERNEL); 130 if (!node) { 131 r = -ENOMEM; 132 goto err_out; 133 } 134 135 node->tbo = tbo; 136 137 spin_lock(&mgr->lock); 138 r = drm_mm_insert_node_in_range(&mgr->mm, &node->node, mem->num_pages, 139 mem->page_alignment, 0, place->fpfn, 140 place->lpfn, DRM_MM_INSERT_BEST); 141 spin_unlock(&mgr->lock); 142 143 if (unlikely(r)) 144 goto err_free; 145 146 mem->mm_node = node; 147 mem->start = node->node.start; 148 149 return 0; 150 151 err_free: 152 kfree(node); 153 154 err_out: 155 atomic64_add(mem->num_pages, &mgr->available); 156 157 return r; 158 } 159 160 /** 161 * amdgpu_gtt_mgr_del - free ranges 162 * 163 * @man: TTM memory type manager 164 * @mem: TTM memory object 165 * 166 * Free the allocated GTT again. 167 */ 168 static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man, 169 struct ttm_resource *mem) 170 { 171 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 172 struct amdgpu_gtt_node *node = mem->mm_node; 173 174 if (node) { 175 spin_lock(&mgr->lock); 176 drm_mm_remove_node(&node->node); 177 spin_unlock(&mgr->lock); 178 kfree(node); 179 } 180 181 atomic64_add(mem->num_pages, &mgr->available); 182 } 183 184 /** 185 * amdgpu_gtt_mgr_usage - return usage of GTT domain 186 * 187 * @man: TTM memory type manager 188 * 189 * Return how many bytes are used in the GTT domain 190 */ 191 uint64_t amdgpu_gtt_mgr_usage(struct ttm_resource_manager *man) 192 { 193 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 194 s64 result = man->size - atomic64_read(&mgr->available); 195 196 return (result > 0 ? result : 0) * PAGE_SIZE; 197 } 198 199 /** 200 * amdgpu_gtt_mgr_recover - re-init gart 201 * 202 * @man: TTM memory type manager 203 * 204 * Re-init the gart for each known BO in the GTT. 205 */ 206 int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man) 207 { 208 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 209 struct amdgpu_gtt_node *node; 210 struct drm_mm_node *mm_node; 211 int r = 0; 212 213 spin_lock(&mgr->lock); 214 drm_mm_for_each_node(mm_node, &mgr->mm) { 215 node = container_of(mm_node, struct amdgpu_gtt_node, node); 216 r = amdgpu_ttm_recover_gart(node->tbo); 217 if (r) 218 break; 219 } 220 spin_unlock(&mgr->lock); 221 222 return r; 223 } 224 225 /** 226 * amdgpu_gtt_mgr_debug - dump VRAM table 227 * 228 * @man: TTM memory type manager 229 * @printer: DRM printer to use 230 * 231 * Dump the table content using printk. 232 */ 233 static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man, 234 struct drm_printer *printer) 235 { 236 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 237 238 spin_lock(&mgr->lock); 239 drm_mm_print(&mgr->mm, printer); 240 spin_unlock(&mgr->lock); 241 242 drm_printf(printer, "man size:%llu pages, gtt available:%lld pages, usage:%lluMB\n", 243 man->size, (u64)atomic64_read(&mgr->available), 244 amdgpu_gtt_mgr_usage(man) >> 20); 245 } 246 247 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = { 248 .alloc = amdgpu_gtt_mgr_new, 249 .free = amdgpu_gtt_mgr_del, 250 .debug = amdgpu_gtt_mgr_debug 251 }; 252 253 /** 254 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM 255 * 256 * @adev: amdgpu_device pointer 257 * @gtt_size: maximum size of GTT 258 * 259 * Allocate and initialize the GTT manager. 260 */ 261 int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size) 262 { 263 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr; 264 struct ttm_resource_manager *man = &mgr->manager; 265 uint64_t start, size; 266 int ret; 267 268 man->use_tt = true; 269 man->func = &amdgpu_gtt_mgr_func; 270 271 ttm_resource_manager_init(man, gtt_size >> PAGE_SHIFT); 272 273 start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS; 274 size = (adev->gmc.gart_size >> PAGE_SHIFT) - start; 275 drm_mm_init(&mgr->mm, start, size); 276 spin_lock_init(&mgr->lock); 277 atomic64_set(&mgr->available, gtt_size >> PAGE_SHIFT); 278 279 ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_total); 280 if (ret) { 281 DRM_ERROR("Failed to create device file mem_info_gtt_total\n"); 282 return ret; 283 } 284 ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_used); 285 if (ret) { 286 DRM_ERROR("Failed to create device file mem_info_gtt_used\n"); 287 return ret; 288 } 289 290 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager); 291 ttm_resource_manager_set_used(man, true); 292 return 0; 293 } 294 295 /** 296 * amdgpu_gtt_mgr_fini - free and destroy GTT manager 297 * 298 * @adev: amdgpu_device pointer 299 * 300 * Destroy and free the GTT manager, returns -EBUSY if ranges are still 301 * allocated inside it. 302 */ 303 void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev) 304 { 305 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr; 306 struct ttm_resource_manager *man = &mgr->manager; 307 int ret; 308 309 ttm_resource_manager_set_used(man, false); 310 311 ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man); 312 if (ret) 313 return; 314 315 spin_lock(&mgr->lock); 316 drm_mm_takedown(&mgr->mm); 317 spin_unlock(&mgr->lock); 318 319 device_remove_file(adev->dev, &dev_attr_mem_info_gtt_total); 320 device_remove_file(adev->dev, &dev_attr_mem_info_gtt_used); 321 322 ttm_resource_manager_cleanup(man); 323 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL); 324 } 325