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/drmP.h> 26 #include "amdgpu.h" 27 28 struct amdgpu_vram_mgr { 29 struct drm_mm mm; 30 spinlock_t lock; 31 atomic64_t usage; 32 atomic64_t vis_usage; 33 }; 34 35 /** 36 * DOC: mem_info_vram_total 37 * 38 * The amdgpu driver provides a sysfs API for reporting current total VRAM 39 * available on the device 40 * The file mem_info_vram_total is used for this and returns the total 41 * amount of VRAM in bytes 42 */ 43 static ssize_t amdgpu_mem_info_vram_total_show(struct device *dev, 44 struct device_attribute *attr, char *buf) 45 { 46 struct drm_device *ddev = dev_get_drvdata(dev); 47 struct amdgpu_device *adev = ddev->dev_private; 48 49 return snprintf(buf, PAGE_SIZE, "%llu\n", adev->gmc.real_vram_size); 50 } 51 52 /** 53 * DOC: mem_info_vis_vram_total 54 * 55 * The amdgpu driver provides a sysfs API for reporting current total 56 * visible VRAM available on the device 57 * The file mem_info_vis_vram_total is used for this and returns the total 58 * amount of visible VRAM in bytes 59 */ 60 static ssize_t amdgpu_mem_info_vis_vram_total_show(struct device *dev, 61 struct device_attribute *attr, char *buf) 62 { 63 struct drm_device *ddev = dev_get_drvdata(dev); 64 struct amdgpu_device *adev = ddev->dev_private; 65 66 return snprintf(buf, PAGE_SIZE, "%llu\n", adev->gmc.visible_vram_size); 67 } 68 69 /** 70 * DOC: mem_info_vram_used 71 * 72 * The amdgpu driver provides a sysfs API for reporting current total VRAM 73 * available on the device 74 * The file mem_info_vram_used is used for this and returns the total 75 * amount of currently used VRAM in bytes 76 */ 77 static ssize_t amdgpu_mem_info_vram_used_show(struct device *dev, 78 struct device_attribute *attr, char *buf) 79 { 80 struct drm_device *ddev = dev_get_drvdata(dev); 81 struct amdgpu_device *adev = ddev->dev_private; 82 83 return snprintf(buf, PAGE_SIZE, "%llu\n", 84 amdgpu_vram_mgr_usage(&adev->mman.bdev.man[TTM_PL_VRAM])); 85 } 86 87 /** 88 * DOC: mem_info_vis_vram_used 89 * 90 * The amdgpu driver provides a sysfs API for reporting current total of 91 * used visible VRAM 92 * The file mem_info_vis_vram_used is used for this and returns the total 93 * amount of currently used visible VRAM in bytes 94 */ 95 static ssize_t amdgpu_mem_info_vis_vram_used_show(struct device *dev, 96 struct device_attribute *attr, char *buf) 97 { 98 struct drm_device *ddev = dev_get_drvdata(dev); 99 struct amdgpu_device *adev = ddev->dev_private; 100 101 return snprintf(buf, PAGE_SIZE, "%llu\n", 102 amdgpu_vram_mgr_vis_usage(&adev->mman.bdev.man[TTM_PL_VRAM])); 103 } 104 105 static DEVICE_ATTR(mem_info_vram_total, S_IRUGO, 106 amdgpu_mem_info_vram_total_show, NULL); 107 static DEVICE_ATTR(mem_info_vis_vram_total, S_IRUGO, 108 amdgpu_mem_info_vis_vram_total_show,NULL); 109 static DEVICE_ATTR(mem_info_vram_used, S_IRUGO, 110 amdgpu_mem_info_vram_used_show, NULL); 111 static DEVICE_ATTR(mem_info_vis_vram_used, S_IRUGO, 112 amdgpu_mem_info_vis_vram_used_show, NULL); 113 114 /** 115 * amdgpu_vram_mgr_init - init VRAM manager and DRM MM 116 * 117 * @man: TTM memory type manager 118 * @p_size: maximum size of VRAM 119 * 120 * Allocate and initialize the VRAM manager. 121 */ 122 static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man, 123 unsigned long p_size) 124 { 125 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev); 126 struct amdgpu_vram_mgr *mgr; 127 int ret; 128 129 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); 130 if (!mgr) 131 return -ENOMEM; 132 133 drm_mm_init(&mgr->mm, 0, p_size); 134 spin_lock_init(&mgr->lock); 135 man->priv = mgr; 136 137 /* Add the two VRAM-related sysfs files */ 138 ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_total); 139 if (ret) { 140 DRM_ERROR("Failed to create device file mem_info_vram_total\n"); 141 return ret; 142 } 143 ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_total); 144 if (ret) { 145 DRM_ERROR("Failed to create device file mem_info_vis_vram_total\n"); 146 return ret; 147 } 148 ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_used); 149 if (ret) { 150 DRM_ERROR("Failed to create device file mem_info_vram_used\n"); 151 return ret; 152 } 153 ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_used); 154 if (ret) { 155 DRM_ERROR("Failed to create device file mem_info_vis_vram_used\n"); 156 return ret; 157 } 158 159 return 0; 160 } 161 162 /** 163 * amdgpu_vram_mgr_fini - free and destroy VRAM manager 164 * 165 * @man: TTM memory type manager 166 * 167 * Destroy and free the VRAM manager, returns -EBUSY if ranges are still 168 * allocated inside it. 169 */ 170 static int amdgpu_vram_mgr_fini(struct ttm_mem_type_manager *man) 171 { 172 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev); 173 struct amdgpu_vram_mgr *mgr = man->priv; 174 175 spin_lock(&mgr->lock); 176 drm_mm_takedown(&mgr->mm); 177 spin_unlock(&mgr->lock); 178 kfree(mgr); 179 man->priv = NULL; 180 device_remove_file(adev->dev, &dev_attr_mem_info_vram_total); 181 device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_total); 182 device_remove_file(adev->dev, &dev_attr_mem_info_vram_used); 183 device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_used); 184 return 0; 185 } 186 187 /** 188 * amdgpu_vram_mgr_vis_size - Calculate visible node size 189 * 190 * @adev: amdgpu device structure 191 * @node: MM node structure 192 * 193 * Calculate how many bytes of the MM node are inside visible VRAM 194 */ 195 static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev, 196 struct drm_mm_node *node) 197 { 198 uint64_t start = node->start << PAGE_SHIFT; 199 uint64_t end = (node->size + node->start) << PAGE_SHIFT; 200 201 if (start >= adev->gmc.visible_vram_size) 202 return 0; 203 204 return (end > adev->gmc.visible_vram_size ? 205 adev->gmc.visible_vram_size : end) - start; 206 } 207 208 /** 209 * amdgpu_vram_mgr_bo_visible_size - CPU visible BO size 210 * 211 * @bo: &amdgpu_bo buffer object (must be in VRAM) 212 * 213 * Returns: 214 * How much of the given &amdgpu_bo buffer object lies in CPU visible VRAM. 215 */ 216 u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo) 217 { 218 struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); 219 struct ttm_mem_reg *mem = &bo->tbo.mem; 220 struct drm_mm_node *nodes = mem->mm_node; 221 unsigned pages = mem->num_pages; 222 u64 usage; 223 224 if (amdgpu_gmc_vram_full_visible(&adev->gmc)) 225 return amdgpu_bo_size(bo); 226 227 if (mem->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT) 228 return 0; 229 230 for (usage = 0; nodes && pages; pages -= nodes->size, nodes++) 231 usage += amdgpu_vram_mgr_vis_size(adev, nodes); 232 233 return usage; 234 } 235 236 /** 237 * amdgpu_vram_mgr_virt_start - update virtual start address 238 * 239 * @mem: ttm_mem_reg to update 240 * @node: just allocated node 241 * 242 * Calculate a virtual BO start address to easily check if everything is CPU 243 * accessible. 244 */ 245 static void amdgpu_vram_mgr_virt_start(struct ttm_mem_reg *mem, 246 struct drm_mm_node *node) 247 { 248 unsigned long start; 249 250 start = node->start + node->size; 251 if (start > mem->num_pages) 252 start -= mem->num_pages; 253 else 254 start = 0; 255 mem->start = max(mem->start, start); 256 } 257 258 /** 259 * amdgpu_vram_mgr_new - allocate new ranges 260 * 261 * @man: TTM memory type manager 262 * @tbo: TTM BO we need this range for 263 * @place: placement flags and restrictions 264 * @mem: the resulting mem object 265 * 266 * Allocate VRAM for the given BO. 267 */ 268 static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man, 269 struct ttm_buffer_object *tbo, 270 const struct ttm_place *place, 271 struct ttm_mem_reg *mem) 272 { 273 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev); 274 struct amdgpu_vram_mgr *mgr = man->priv; 275 struct drm_mm *mm = &mgr->mm; 276 struct drm_mm_node *nodes; 277 enum drm_mm_insert_mode mode; 278 unsigned long lpfn, num_nodes, pages_per_node, pages_left; 279 uint64_t usage = 0, vis_usage = 0; 280 unsigned i; 281 int r; 282 283 lpfn = place->lpfn; 284 if (!lpfn) 285 lpfn = man->size; 286 287 if (place->flags & TTM_PL_FLAG_CONTIGUOUS || 288 amdgpu_vram_page_split == -1) { 289 pages_per_node = ~0ul; 290 num_nodes = 1; 291 } else { 292 pages_per_node = max((uint32_t)amdgpu_vram_page_split, 293 mem->page_alignment); 294 num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node); 295 } 296 297 nodes = kvmalloc_array(num_nodes, sizeof(*nodes), 298 GFP_KERNEL | __GFP_ZERO); 299 if (!nodes) 300 return -ENOMEM; 301 302 mode = DRM_MM_INSERT_BEST; 303 if (place->flags & TTM_PL_FLAG_TOPDOWN) 304 mode = DRM_MM_INSERT_HIGH; 305 306 mem->start = 0; 307 pages_left = mem->num_pages; 308 309 spin_lock(&mgr->lock); 310 for (i = 0; pages_left >= pages_per_node; ++i) { 311 unsigned long pages = rounddown_pow_of_two(pages_left); 312 313 r = drm_mm_insert_node_in_range(mm, &nodes[i], pages, 314 pages_per_node, 0, 315 place->fpfn, lpfn, 316 mode); 317 if (unlikely(r)) 318 break; 319 320 usage += nodes[i].size << PAGE_SHIFT; 321 vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]); 322 amdgpu_vram_mgr_virt_start(mem, &nodes[i]); 323 pages_left -= pages; 324 } 325 326 for (; pages_left; ++i) { 327 unsigned long pages = min(pages_left, pages_per_node); 328 uint32_t alignment = mem->page_alignment; 329 330 if (pages == pages_per_node) 331 alignment = pages_per_node; 332 333 r = drm_mm_insert_node_in_range(mm, &nodes[i], 334 pages, alignment, 0, 335 place->fpfn, lpfn, 336 mode); 337 if (unlikely(r)) 338 goto error; 339 340 usage += nodes[i].size << PAGE_SHIFT; 341 vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]); 342 amdgpu_vram_mgr_virt_start(mem, &nodes[i]); 343 pages_left -= pages; 344 } 345 spin_unlock(&mgr->lock); 346 347 atomic64_add(usage, &mgr->usage); 348 atomic64_add(vis_usage, &mgr->vis_usage); 349 350 mem->mm_node = nodes; 351 352 return 0; 353 354 error: 355 while (i--) 356 drm_mm_remove_node(&nodes[i]); 357 spin_unlock(&mgr->lock); 358 359 kvfree(nodes); 360 return r == -ENOSPC ? 0 : r; 361 } 362 363 /** 364 * amdgpu_vram_mgr_del - free ranges 365 * 366 * @man: TTM memory type manager 367 * @tbo: TTM BO we need this range for 368 * @place: placement flags and restrictions 369 * @mem: TTM memory object 370 * 371 * Free the allocated VRAM again. 372 */ 373 static void amdgpu_vram_mgr_del(struct ttm_mem_type_manager *man, 374 struct ttm_mem_reg *mem) 375 { 376 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev); 377 struct amdgpu_vram_mgr *mgr = man->priv; 378 struct drm_mm_node *nodes = mem->mm_node; 379 uint64_t usage = 0, vis_usage = 0; 380 unsigned pages = mem->num_pages; 381 382 if (!mem->mm_node) 383 return; 384 385 spin_lock(&mgr->lock); 386 while (pages) { 387 pages -= nodes->size; 388 drm_mm_remove_node(nodes); 389 usage += nodes->size << PAGE_SHIFT; 390 vis_usage += amdgpu_vram_mgr_vis_size(adev, nodes); 391 ++nodes; 392 } 393 spin_unlock(&mgr->lock); 394 395 atomic64_sub(usage, &mgr->usage); 396 atomic64_sub(vis_usage, &mgr->vis_usage); 397 398 kvfree(mem->mm_node); 399 mem->mm_node = NULL; 400 } 401 402 /** 403 * amdgpu_vram_mgr_usage - how many bytes are used in this domain 404 * 405 * @man: TTM memory type manager 406 * 407 * Returns how many bytes are used in this domain. 408 */ 409 uint64_t amdgpu_vram_mgr_usage(struct ttm_mem_type_manager *man) 410 { 411 struct amdgpu_vram_mgr *mgr = man->priv; 412 413 return atomic64_read(&mgr->usage); 414 } 415 416 /** 417 * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part 418 * 419 * @man: TTM memory type manager 420 * 421 * Returns how many bytes are used in the visible part of VRAM 422 */ 423 uint64_t amdgpu_vram_mgr_vis_usage(struct ttm_mem_type_manager *man) 424 { 425 struct amdgpu_vram_mgr *mgr = man->priv; 426 427 return atomic64_read(&mgr->vis_usage); 428 } 429 430 /** 431 * amdgpu_vram_mgr_debug - dump VRAM table 432 * 433 * @man: TTM memory type manager 434 * @printer: DRM printer to use 435 * 436 * Dump the table content using printk. 437 */ 438 static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man, 439 struct drm_printer *printer) 440 { 441 struct amdgpu_vram_mgr *mgr = man->priv; 442 443 spin_lock(&mgr->lock); 444 drm_mm_print(&mgr->mm, printer); 445 spin_unlock(&mgr->lock); 446 447 drm_printf(printer, "man size:%llu pages, ram usage:%lluMB, vis usage:%lluMB\n", 448 man->size, amdgpu_vram_mgr_usage(man) >> 20, 449 amdgpu_vram_mgr_vis_usage(man) >> 20); 450 } 451 452 const struct ttm_mem_type_manager_func amdgpu_vram_mgr_func = { 453 .init = amdgpu_vram_mgr_init, 454 .takedown = amdgpu_vram_mgr_fini, 455 .get_node = amdgpu_vram_mgr_new, 456 .put_node = amdgpu_vram_mgr_del, 457 .debug = amdgpu_vram_mgr_debug 458 }; 459