drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c

   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 <linux/dma-mapping.h>
  26 #include <drm/ttm/ttm_range_manager.h>
  27
  28 #include "amdgpu.h"
  29 #include "amdgpu_vm.h"
  30 #include "amdgpu_res_cursor.h"
  31 #include "amdgpu_atomfirmware.h"
  32 #include "atom.h"
  33
  34 struct amdgpu_vram_reservation {
  35         u64 start;
  36         u64 size;
  37         struct list_head allocated;
  38         struct list_head blocks;
  39 };
  40
  41 static inline struct amdgpu_vram_mgr *
  42 to_vram_mgr(struct ttm_resource_manager *man)
  43 {
  44         return container_of(man, struct amdgpu_vram_mgr, manager);
  45 }
  46
  47 static inline struct amdgpu_device *
  48 to_amdgpu_device(struct amdgpu_vram_mgr *mgr)
  49 {
  50         return container_of(mgr, struct amdgpu_device, mman.vram_mgr);
  51 }
  52
  53 /**
  54  * DOC: mem_info_vram_total
  55  *
  56  * The amdgpu driver provides a sysfs API for reporting current total VRAM
  57  * available on the device
  58  * The file mem_info_vram_total is used for this and returns the total
  59  * amount of VRAM in bytes
  60  */
  61 static ssize_t amdgpu_mem_info_vram_total_show(struct device *dev,
  62                 struct device_attribute *attr, char *buf)
  63 {
  64         struct drm_device *ddev = dev_get_drvdata(dev);
  65         struct amdgpu_device *adev = drm_to_adev(ddev);
  66
  67         return sysfs_emit(buf, "%llu\n", adev->gmc.real_vram_size);
  68 }
  69
  70 /**
  71  * DOC: mem_info_vis_vram_total
  72  *
  73  * The amdgpu driver provides a sysfs API for reporting current total
  74  * visible VRAM available on the device
  75  * The file mem_info_vis_vram_total is used for this and returns the total
  76  * amount of visible VRAM in bytes
  77  */
  78 static ssize_t amdgpu_mem_info_vis_vram_total_show(struct device *dev,
  79                 struct device_attribute *attr, char *buf)
  80 {
  81         struct drm_device *ddev = dev_get_drvdata(dev);
  82         struct amdgpu_device *adev = drm_to_adev(ddev);
  83
  84         return sysfs_emit(buf, "%llu\n", adev->gmc.visible_vram_size);
  85 }
  86
  87 /**
  88  * DOC: mem_info_vram_used
  89  *
  90  * The amdgpu driver provides a sysfs API for reporting current total VRAM
  91  * available on the device
  92  * The file mem_info_vram_used is used for this and returns the total
  93  * amount of currently used VRAM in bytes
  94  */
  95 static ssize_t amdgpu_mem_info_vram_used_show(struct device *dev,
  96                                               struct device_attribute *attr,
  97                                               char *buf)
  98 {
  99         struct drm_device *ddev = dev_get_drvdata(dev);
 100         struct amdgpu_device *adev = drm_to_adev(ddev);
 101         struct ttm_resource_manager *man = &adev->mman.vram_mgr.manager;
 102
 103         return sysfs_emit(buf, "%llu\n", ttm_resource_manager_usage(man));
 104 }
 105
 106 /**
 107  * DOC: mem_info_vis_vram_used
 108  *
 109  * The amdgpu driver provides a sysfs API for reporting current total of
 110  * used visible VRAM
 111  * The file mem_info_vis_vram_used is used for this and returns the total
 112  * amount of currently used visible VRAM in bytes
 113  */
 114 static ssize_t amdgpu_mem_info_vis_vram_used_show(struct device *dev,
 115                                                   struct device_attribute *attr,
 116                                                   char *buf)
 117 {
 118         struct drm_device *ddev = dev_get_drvdata(dev);
 119         struct amdgpu_device *adev = drm_to_adev(ddev);
 120
 121         return sysfs_emit(buf, "%llu\n",
 122                           amdgpu_vram_mgr_vis_usage(&adev->mman.vram_mgr));
 123 }
 124
 125 /**
 126  * DOC: mem_info_vram_vendor
 127  *
 128  * The amdgpu driver provides a sysfs API for reporting the vendor of the
 129  * installed VRAM
 130  * The file mem_info_vram_vendor is used for this and returns the name of the
 131  * vendor.
 132  */
 133 static ssize_t amdgpu_mem_info_vram_vendor(struct device *dev,
 134                                            struct device_attribute *attr,
 135                                            char *buf)
 136 {
 137         struct drm_device *ddev = dev_get_drvdata(dev);
 138         struct amdgpu_device *adev = drm_to_adev(ddev);
 139
 140         switch (adev->gmc.vram_vendor) {
 141         case SAMSUNG:
 142                 return sysfs_emit(buf, "samsung\n");
 143         case INFINEON:
 144                 return sysfs_emit(buf, "infineon\n");
 145         case ELPIDA:
 146                 return sysfs_emit(buf, "elpida\n");
 147         case ETRON:
 148                 return sysfs_emit(buf, "etron\n");
 149         case NANYA:
 150                 return sysfs_emit(buf, "nanya\n");
 151         case HYNIX:
 152                 return sysfs_emit(buf, "hynix\n");
 153         case MOSEL:
 154                 return sysfs_emit(buf, "mosel\n");
 155         case WINBOND:
 156                 return sysfs_emit(buf, "winbond\n");
 157         case ESMT:
 158                 return sysfs_emit(buf, "esmt\n");
 159         case MICRON:
 160                 return sysfs_emit(buf, "micron\n");
 161         default:
 162                 return sysfs_emit(buf, "unknown\n");
 163         }
 164 }
 165
 166 static DEVICE_ATTR(mem_info_vram_total, S_IRUGO,
 167                    amdgpu_mem_info_vram_total_show, NULL);
 168 static DEVICE_ATTR(mem_info_vis_vram_total, S_IRUGO,
 169                    amdgpu_mem_info_vis_vram_total_show,NULL);
 170 static DEVICE_ATTR(mem_info_vram_used, S_IRUGO,
 171                    amdgpu_mem_info_vram_used_show, NULL);
 172 static DEVICE_ATTR(mem_info_vis_vram_used, S_IRUGO,
 173                    amdgpu_mem_info_vis_vram_used_show, NULL);
 174 static DEVICE_ATTR(mem_info_vram_vendor, S_IRUGO,
 175                    amdgpu_mem_info_vram_vendor, NULL);
 176
 177 static struct attribute *amdgpu_vram_mgr_attributes[] = {
 178         &dev_attr_mem_info_vram_total.attr,
 179         &dev_attr_mem_info_vis_vram_total.attr,
 180         &dev_attr_mem_info_vram_used.attr,
 181         &dev_attr_mem_info_vis_vram_used.attr,
 182         &dev_attr_mem_info_vram_vendor.attr,
 183         NULL
 184 };
 185
 186 const struct attribute_group amdgpu_vram_mgr_attr_group = {
 187         .attrs = amdgpu_vram_mgr_attributes
 188 };
 189
 190 /**
 191  * amdgpu_vram_mgr_vis_size - Calculate visible block size
 192  *
 193  * @adev: amdgpu_device pointer
 194  * @block: DRM BUDDY block structure
 195  *
 196  * Calculate how many bytes of the DRM BUDDY block are inside visible VRAM
 197  */
 198 static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev,
 199                                     struct drm_buddy_block *block)
 200 {
 201         u64 start = amdgpu_vram_mgr_block_start(block);
 202         u64 end = start + amdgpu_vram_mgr_block_size(block);
 203
 204         if (start >= adev->gmc.visible_vram_size)
 205                 return 0;
 206
 207         return (end > adev->gmc.visible_vram_size ?
 208                 adev->gmc.visible_vram_size : end) - start;
 209 }
 210
 211 /**
 212  * amdgpu_vram_mgr_bo_visible_size - CPU visible BO size
 213  *
 214  * @bo: &amdgpu_bo buffer object (must be in VRAM)
 215  *
 216  * Returns:
 217  * How much of the given &amdgpu_bo buffer object lies in CPU visible VRAM.
 218  */
 219 u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo)
 220 {
 221         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 222         struct ttm_resource *res = bo->tbo.resource;
 223         struct amdgpu_vram_mgr_resource *vres = to_amdgpu_vram_mgr_resource(res);
 224         struct drm_buddy_block *block;
 225         u64 usage = 0;
 226
 227         if (amdgpu_gmc_vram_full_visible(&adev->gmc))
 228                 return amdgpu_bo_size(bo);
 229
 230         if (res->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT)
 231                 return 0;
 232
 233         list_for_each_entry(block, &vres->blocks, link)
 234                 usage += amdgpu_vram_mgr_vis_size(adev, block);
 235
 236         return usage;
 237 }
 238
 239 /* Commit the reservation of VRAM pages */
 240 static void amdgpu_vram_mgr_do_reserve(struct ttm_resource_manager *man)
 241 {
 242         struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 243         struct amdgpu_device *adev = to_amdgpu_device(mgr);
 244         struct drm_buddy *mm = &mgr->mm;
 245         struct amdgpu_vram_reservation *rsv, *temp;
 246         struct drm_buddy_block *block;
 247         uint64_t vis_usage;
 248
 249         list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, blocks) {
 250                 if (drm_buddy_alloc_blocks(mm, rsv->start, rsv->start + rsv->size,
 251                                            rsv->size, mm->chunk_size, &rsv->allocated,
 252                                            DRM_BUDDY_RANGE_ALLOCATION))
 253                         continue;
 254
 255                 block = amdgpu_vram_mgr_first_block(&rsv->allocated);
 256                 if (!block)
 257                         continue;
 258
 259                 dev_dbg(adev->dev, "Reservation 0x%llx - %lld, Succeeded\n",
 260                         rsv->start, rsv->size);
 261
 262                 vis_usage = amdgpu_vram_mgr_vis_size(adev, block);
 263                 atomic64_add(vis_usage, &mgr->vis_usage);
 264                 spin_lock(&man->bdev->lru_lock);
 265                 man->usage += rsv->size;
 266                 spin_unlock(&man->bdev->lru_lock);
 267                 list_move(&rsv->blocks, &mgr->reserved_pages);
 268         }
 269 }
 270
 271 /**
 272  * amdgpu_vram_mgr_reserve_range - Reserve a range from VRAM
 273  *
 274  * @mgr: amdgpu_vram_mgr pointer
 275  * @start: start address of the range in VRAM
 276  * @size: size of the range
 277  *
 278  * Reserve memory from start address with the specified size in VRAM
 279  */
 280 int amdgpu_vram_mgr_reserve_range(struct amdgpu_vram_mgr *mgr,
 281                                   uint64_t start, uint64_t size)
 282 {
 283         struct amdgpu_vram_reservation *rsv;
 284
 285         rsv = kzalloc(sizeof(*rsv), GFP_KERNEL);
 286         if (!rsv)
 287                 return -ENOMEM;
 288
 289         INIT_LIST_HEAD(&rsv->allocated);
 290         INIT_LIST_HEAD(&rsv->blocks);
 291
 292         rsv->start = start;
 293         rsv->size = size;
 294
 295         mutex_lock(&mgr->lock);
 296         list_add_tail(&rsv->blocks, &mgr->reservations_pending);
 297         amdgpu_vram_mgr_do_reserve(&mgr->manager);
 298         mutex_unlock(&mgr->lock);
 299
 300         return 0;
 301 }
 302
 303 /**
 304  * amdgpu_vram_mgr_query_page_status - query the reservation status
 305  *
 306  * @mgr: amdgpu_vram_mgr pointer
 307  * @start: start address of a page in VRAM
 308  *
 309  * Returns:
 310  *      -EBUSY: the page is still hold and in pending list
 311  *      0: the page has been reserved
 312  *      -ENOENT: the input page is not a reservation
 313  */
 314 int amdgpu_vram_mgr_query_page_status(struct amdgpu_vram_mgr *mgr,
 315                                       uint64_t start)
 316 {
 317         struct amdgpu_vram_reservation *rsv;
 318         int ret;
 319
 320         mutex_lock(&mgr->lock);
 321
 322         list_for_each_entry(rsv, &mgr->reservations_pending, blocks) {
 323                 if (rsv->start <= start &&
 324                     (start < (rsv->start + rsv->size))) {
 325                         ret = -EBUSY;
 326                         goto out;
 327                 }
 328         }
 329
 330         list_for_each_entry(rsv, &mgr->reserved_pages, blocks) {
 331                 if (rsv->start <= start &&
 332                     (start < (rsv->start + rsv->size))) {
 333                         ret = 0;
 334                         goto out;
 335                 }
 336         }
 337
 338         ret = -ENOENT;
 339 out:
 340         mutex_unlock(&mgr->lock);
 341         return ret;
 342 }
 343
 344 /**
 345  * amdgpu_vram_mgr_new - allocate new ranges
 346  *
 347  * @man: TTM memory type manager
 348  * @tbo: TTM BO we need this range for
 349  * @place: placement flags and restrictions
 350  * @res: the resulting mem object
 351  *
 352  * Allocate VRAM for the given BO.
 353  */
 354 static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
 355                                struct ttm_buffer_object *tbo,
 356                                const struct ttm_place *place,
 357                                struct ttm_resource **res)
 358 {
 359         u64 vis_usage = 0, max_bytes, cur_size, min_block_size;
 360         struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 361         struct amdgpu_device *adev = to_amdgpu_device(mgr);
 362         struct amdgpu_vram_mgr_resource *vres;
 363         u64 size, remaining_size, lpfn, fpfn;
 364         struct drm_buddy *mm = &mgr->mm;
 365         struct drm_buddy_block *block;
 366         unsigned long pages_per_block;
 367         int r;
 368
 369         lpfn = place->lpfn << PAGE_SHIFT;
 370         if (!lpfn)
 371                 lpfn = man->size;
 372
 373         fpfn = place->fpfn << PAGE_SHIFT;
 374
 375         max_bytes = adev->gmc.mc_vram_size;
 376         if (tbo->type != ttm_bo_type_kernel)
 377                 max_bytes -= AMDGPU_VM_RESERVED_VRAM;
 378
 379         if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
 380                 pages_per_block = ~0ul;
 381         } else {
 382 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 383                 pages_per_block = HPAGE_PMD_NR;
 384 #else
 385                 /* default to 2MB */
 386                 pages_per_block = 2UL << (20UL - PAGE_SHIFT);
 387 #endif
 388                 pages_per_block = max_t(uint32_t, pages_per_block,
 389                                         tbo->page_alignment);
 390         }
 391
 392         vres = kzalloc(sizeof(*vres), GFP_KERNEL);
 393         if (!vres)
 394                 return -ENOMEM;
 395
 396         ttm_resource_init(tbo, place, &vres->base);
 397
 398         /* bail out quickly if there's likely not enough VRAM for this BO */
 399         if (ttm_resource_manager_usage(man) > max_bytes) {
 400                 r = -ENOSPC;
 401                 goto error_fini;
 402         }
 403
 404         INIT_LIST_HEAD(&vres->blocks);
 405
 406         if (place->flags & TTM_PL_FLAG_TOPDOWN)
 407                 vres->flags |= DRM_BUDDY_TOPDOWN_ALLOCATION;
 408
 409         if (fpfn || lpfn != man->size)
 410                 /* Allocate blocks in desired range */
 411                 vres->flags |= DRM_BUDDY_RANGE_ALLOCATION;
 412
 413         remaining_size = vres->base.num_pages << PAGE_SHIFT;
 414
 415         mutex_lock(&mgr->lock);
 416         while (remaining_size) {
 417                 if (tbo->page_alignment)
 418                         min_block_size = tbo->page_alignment << PAGE_SHIFT;
 419                 else
 420                         min_block_size = mgr->default_page_size;
 421
 422                 BUG_ON(min_block_size < mm->chunk_size);
 423
 424                 /* Limit maximum size to 2GiB due to SG table limitations */
 425                 size = min(remaining_size, 2ULL << 30);
 426
 427                 if (size >= pages_per_block << PAGE_SHIFT)
 428                         min_block_size = pages_per_block << PAGE_SHIFT;
 429
 430                 cur_size = size;
 431
 432                 if (fpfn + size != place->lpfn << PAGE_SHIFT) {
 433                         /*
 434                          * Except for actual range allocation, modify the size and
 435                          * min_block_size conforming to continuous flag enablement
 436                          */
 437                         if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
 438                                 size = roundup_pow_of_two(size);
 439                                 min_block_size = size;
 440                         /*
 441                          * Modify the size value if size is not
 442                          * aligned with min_block_size
 443                          */
 444                         } else if (!IS_ALIGNED(size, min_block_size)) {
 445                                 size = round_up(size, min_block_size);
 446                         }
 447                 }
 448
 449                 r = drm_buddy_alloc_blocks(mm, fpfn,
 450                                            lpfn,
 451                                            size,
 452                                            min_block_size,
 453                                            &vres->blocks,
 454                                            vres->flags);
 455                 if (unlikely(r))
 456                         goto error_free_blocks;
 457
 458                 if (size > remaining_size)
 459                         remaining_size = 0;
 460                 else
 461                         remaining_size -= size;
 462         }
 463         mutex_unlock(&mgr->lock);
 464
 465         if (cur_size != size) {
 466                 struct drm_buddy_block *block;
 467                 struct list_head *trim_list;
 468                 u64 original_size;
 469                 LIST_HEAD(temp);
 470
 471                 trim_list = &vres->blocks;
 472                 original_size = vres->base.num_pages << PAGE_SHIFT;
 473
 474                 /*
 475                  * If size value is rounded up to min_block_size, trim the last
 476                  * block to the required size
 477                  */
 478                 if (!list_is_singular(&vres->blocks)) {
 479                         block = list_last_entry(&vres->blocks, typeof(*block), link);
 480                         list_move_tail(&block->link, &temp);
 481                         trim_list = &temp;
 482                         /*
 483                          * Compute the original_size value by subtracting the
 484                          * last block size with (aligned size - original size)
 485                          */
 486                         original_size = amdgpu_vram_mgr_block_size(block) - (size - cur_size);
 487                 }
 488
 489                 mutex_lock(&mgr->lock);
 490                 drm_buddy_block_trim(mm,
 491                                      original_size,
 492                                      trim_list);
 493                 mutex_unlock(&mgr->lock);
 494
 495                 if (!list_empty(&temp))
 496                         list_splice_tail(trim_list, &vres->blocks);
 497         }
 498
 499         list_for_each_entry(block, &vres->blocks, link)
 500                 vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
 501
 502         block = amdgpu_vram_mgr_first_block(&vres->blocks);
 503         if (!block) {
 504                 r = -EINVAL;
 505                 goto error_fini;
 506         }
 507
 508         vres->base.start = amdgpu_vram_mgr_block_start(block) >> PAGE_SHIFT;
 509
 510         if (amdgpu_is_vram_mgr_blocks_contiguous(&vres->blocks))
 511                 vres->base.placement |= TTM_PL_FLAG_CONTIGUOUS;
 512
 513         if (adev->gmc.xgmi.connected_to_cpu)
 514                 vres->base.bus.caching = ttm_cached;
 515         else
 516                 vres->base.bus.caching = ttm_write_combined;
 517
 518         atomic64_add(vis_usage, &mgr->vis_usage);
 519         *res = &vres->base;
 520         return 0;
 521
 522 error_free_blocks:
 523         drm_buddy_free_list(mm, &vres->blocks);
 524         mutex_unlock(&mgr->lock);
 525 error_fini:
 526         ttm_resource_fini(man, &vres->base);
 527         kfree(vres);
 528
 529         return r;
 530 }
 531
 532 /**
 533  * amdgpu_vram_mgr_del - free ranges
 534  *
 535  * @man: TTM memory type manager
 536  * @res: TTM memory object
 537  *
 538  * Free the allocated VRAM again.
 539  */
 540 static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man,
 541                                 struct ttm_resource *res)
 542 {
 543         struct amdgpu_vram_mgr_resource *vres = to_amdgpu_vram_mgr_resource(res);
 544         struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 545         struct amdgpu_device *adev = to_amdgpu_device(mgr);
 546         struct drm_buddy *mm = &mgr->mm;
 547         struct drm_buddy_block *block;
 548         uint64_t vis_usage = 0;
 549
 550         mutex_lock(&mgr->lock);
 551         list_for_each_entry(block, &vres->blocks, link)
 552                 vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
 553
 554         amdgpu_vram_mgr_do_reserve(man);
 555
 556         drm_buddy_free_list(mm, &vres->blocks);
 557         mutex_unlock(&mgr->lock);
 558
 559         atomic64_sub(vis_usage, &mgr->vis_usage);
 560
 561         ttm_resource_fini(man, res);
 562         kfree(vres);
 563 }
 564
 565 /**
 566  * amdgpu_vram_mgr_alloc_sgt - allocate and fill a sg table
 567  *
 568  * @adev: amdgpu device pointer
 569  * @res: TTM memory object
 570  * @offset: byte offset from the base of VRAM BO
 571  * @length: number of bytes to export in sg_table
 572  * @dev: the other device
 573  * @dir: dma direction
 574  * @sgt: resulting sg table
 575  *
 576  * Allocate and fill a sg table from a VRAM allocation.
 577  */
 578 int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev,
 579                               struct ttm_resource *res,
 580                               u64 offset, u64 length,
 581                               struct device *dev,
 582                               enum dma_data_direction dir,
 583                               struct sg_table **sgt)
 584 {
 585         struct amdgpu_res_cursor cursor;
 586         struct scatterlist *sg;
 587         int num_entries = 0;
 588         int i, r;
 589
 590         *sgt = kmalloc(sizeof(**sgt), GFP_KERNEL);
 591         if (!*sgt)
 592                 return -ENOMEM;
 593
 594         /* Determine the number of DRM_BUDDY blocks to export */
 595         amdgpu_res_first(res, offset, length, &cursor);
 596         while (cursor.remaining) {
 597                 num_entries++;
 598                 amdgpu_res_next(&cursor, cursor.size);
 599         }
 600
 601         r = sg_alloc_table(*sgt, num_entries, GFP_KERNEL);
 602         if (r)
 603                 goto error_free;
 604
 605         /* Initialize scatterlist nodes of sg_table */
 606         for_each_sgtable_sg((*sgt), sg, i)
 607                 sg->length = 0;
 608
 609         /*
 610          * Walk down DRM_BUDDY blocks to populate scatterlist nodes
 611          * @note: Use iterator api to get first the DRM_BUDDY block
 612          * and the number of bytes from it. Access the following
 613          * DRM_BUDDY block(s) if more buffer needs to exported
 614          */
 615         amdgpu_res_first(res, offset, length, &cursor);
 616         for_each_sgtable_sg((*sgt), sg, i) {
 617                 phys_addr_t phys = cursor.start + adev->gmc.aper_base;
 618                 size_t size = cursor.size;
 619                 dma_addr_t addr;
 620
 621                 addr = dma_map_resource(dev, phys, size, dir,
 622                                         DMA_ATTR_SKIP_CPU_SYNC);
 623                 r = dma_mapping_error(dev, addr);
 624                 if (r)
 625                         goto error_unmap;
 626
 627                 sg_set_page(sg, NULL, size, 0);
 628                 sg_dma_address(sg) = addr;
 629                 sg_dma_len(sg) = size;
 630
 631                 amdgpu_res_next(&cursor, cursor.size);
 632         }
 633
 634         return 0;
 635
 636 error_unmap:
 637         for_each_sgtable_sg((*sgt), sg, i) {
 638                 if (!sg->length)
 639                         continue;
 640
 641                 dma_unmap_resource(dev, sg->dma_address,
 642                                    sg->length, dir,
 643                                    DMA_ATTR_SKIP_CPU_SYNC);
 644         }
 645         sg_free_table(*sgt);
 646
 647 error_free:
 648         kfree(*sgt);
 649         return r;
 650 }
 651
 652 /**
 653  * amdgpu_vram_mgr_free_sgt - allocate and fill a sg table
 654  *
 655  * @dev: device pointer
 656  * @dir: data direction of resource to unmap
 657  * @sgt: sg table to free
 658  *
 659  * Free a previously allocate sg table.
 660  */
 661 void amdgpu_vram_mgr_free_sgt(struct device *dev,
 662                               enum dma_data_direction dir,
 663                               struct sg_table *sgt)
 664 {
 665         struct scatterlist *sg;
 666         int i;
 667
 668         for_each_sgtable_sg(sgt, sg, i)
 669                 dma_unmap_resource(dev, sg->dma_address,
 670                                    sg->length, dir,
 671                                    DMA_ATTR_SKIP_CPU_SYNC);
 672         sg_free_table(sgt);
 673         kfree(sgt);
 674 }
 675
 676 /**
 677  * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part
 678  *
 679  * @mgr: amdgpu_vram_mgr pointer
 680  *
 681  * Returns how many bytes are used in the visible part of VRAM
 682  */
 683 uint64_t amdgpu_vram_mgr_vis_usage(struct amdgpu_vram_mgr *mgr)
 684 {
 685         return atomic64_read(&mgr->vis_usage);
 686 }
 687
 688 /**
 689  * amdgpu_vram_mgr_debug - dump VRAM table
 690  *
 691  * @man: TTM memory type manager
 692  * @printer: DRM printer to use
 693  *
 694  * Dump the table content using printk.
 695  */
 696 static void amdgpu_vram_mgr_debug(struct ttm_resource_manager *man,
 697                                   struct drm_printer *printer)
 698 {
 699         struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 700         struct drm_buddy *mm = &mgr->mm;
 701         struct drm_buddy_block *block;
 702
 703         drm_printf(printer, "  vis usage:%llu\n",
 704                    amdgpu_vram_mgr_vis_usage(mgr));
 705
 706         mutex_lock(&mgr->lock);
 707         drm_printf(printer, "default_page_size: %lluKiB\n",
 708                    mgr->default_page_size >> 10);
 709
 710         drm_buddy_print(mm, printer);
 711
 712         drm_printf(printer, "reserved:\n");
 713         list_for_each_entry(block, &mgr->reserved_pages, link)
 714                 drm_buddy_block_print(mm, block, printer);
 715         mutex_unlock(&mgr->lock);
 716 }
 717
 718 static const struct ttm_resource_manager_func amdgpu_vram_mgr_func = {
 719         .alloc  = amdgpu_vram_mgr_new,
 720         .free   = amdgpu_vram_mgr_del,
 721         .debug  = amdgpu_vram_mgr_debug
 722 };
 723
 724 /**
 725  * amdgpu_vram_mgr_init - init VRAM manager and DRM MM
 726  *
 727  * @adev: amdgpu_device pointer
 728  *
 729  * Allocate and initialize the VRAM manager.
 730  */
 731 int amdgpu_vram_mgr_init(struct amdgpu_device *adev)
 732 {
 733         struct amdgpu_vram_mgr *mgr = &adev->mman.vram_mgr;
 734         struct ttm_resource_manager *man = &mgr->manager;
 735         int err;
 736
 737         ttm_resource_manager_init(man, &adev->mman.bdev,
 738                                   adev->gmc.real_vram_size);
 739
 740         man->func = &amdgpu_vram_mgr_func;
 741
 742         err = drm_buddy_init(&mgr->mm, man->size, PAGE_SIZE);
 743         if (err)
 744                 return err;
 745
 746         mutex_init(&mgr->lock);
 747         INIT_LIST_HEAD(&mgr->reservations_pending);
 748         INIT_LIST_HEAD(&mgr->reserved_pages);
 749         mgr->default_page_size = PAGE_SIZE;
 750
 751         ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, &mgr->manager);
 752         ttm_resource_manager_set_used(man, true);
 753         return 0;
 754 }
 755
 756 /**
 757  * amdgpu_vram_mgr_fini - free and destroy VRAM manager
 758  *
 759  * @adev: amdgpu_device pointer
 760  *
 761  * Destroy and free the VRAM manager, returns -EBUSY if ranges are still
 762  * allocated inside it.
 763  */
 764 void amdgpu_vram_mgr_fini(struct amdgpu_device *adev)
 765 {
 766         struct amdgpu_vram_mgr *mgr = &adev->mman.vram_mgr;
 767         struct ttm_resource_manager *man = &mgr->manager;
 768         int ret;
 769         struct amdgpu_vram_reservation *rsv, *temp;
 770
 771         ttm_resource_manager_set_used(man, false);
 772
 773         ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
 774         if (ret)
 775                 return;
 776
 777         mutex_lock(&mgr->lock);
 778         list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, blocks)
 779                 kfree(rsv);
 780
 781         list_for_each_entry_safe(rsv, temp, &mgr->reserved_pages, blocks) {
 782                 drm_buddy_free_list(&mgr->mm, &rsv->blocks);
 783                 kfree(rsv);
 784         }
 785         drm_buddy_fini(&mgr->mm);
 786         mutex_unlock(&mgr->lock);
 787
 788         ttm_resource_manager_cleanup(man);
 789         ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, NULL);
 790 }