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 static inline struct drm_buddy_block *
  54 amdgpu_vram_mgr_first_block(struct list_head *list)
  55 {
  56         return list_first_entry_or_null(list, struct drm_buddy_block, link);
  57 }
  58
  59 static inline bool amdgpu_is_vram_mgr_blocks_contiguous(struct list_head *head)
  60 {
  61         struct drm_buddy_block *block;
  62         u64 start, size;
  63
  64         block = amdgpu_vram_mgr_first_block(head);
  65         if (!block)
  66                 return false;
  67
  68         while (head != block->link.next) {
  69                 start = amdgpu_vram_mgr_block_start(block);
  70                 size = amdgpu_vram_mgr_block_size(block);
  71
  72                 block = list_entry(block->link.next, struct drm_buddy_block, link);
  73                 if (start + size != amdgpu_vram_mgr_block_start(block))
  74                         return false;
  75         }
  76
  77         return true;
  78 }
  79
  80
  81
  82 /**
  83  * DOC: mem_info_vram_total
  84  *
  85  * The amdgpu driver provides a sysfs API for reporting current total VRAM
  86  * available on the device
  87  * The file mem_info_vram_total is used for this and returns the total
  88  * amount of VRAM in bytes
  89  */
  90 static ssize_t amdgpu_mem_info_vram_total_show(struct device *dev,
  91                 struct device_attribute *attr, char *buf)
  92 {
  93         struct drm_device *ddev = dev_get_drvdata(dev);
  94         struct amdgpu_device *adev = drm_to_adev(ddev);
  95
  96         return sysfs_emit(buf, "%llu\n", adev->gmc.real_vram_size);
  97 }
  98
  99 /**
 100  * DOC: mem_info_vis_vram_total
 101  *
 102  * The amdgpu driver provides a sysfs API for reporting current total
 103  * visible VRAM available on the device
 104  * The file mem_info_vis_vram_total is used for this and returns the total
 105  * amount of visible VRAM in bytes
 106  */
 107 static ssize_t amdgpu_mem_info_vis_vram_total_show(struct device *dev,
 108                 struct device_attribute *attr, char *buf)
 109 {
 110         struct drm_device *ddev = dev_get_drvdata(dev);
 111         struct amdgpu_device *adev = drm_to_adev(ddev);
 112
 113         return sysfs_emit(buf, "%llu\n", adev->gmc.visible_vram_size);
 114 }
 115
 116 /**
 117  * DOC: mem_info_vram_used
 118  *
 119  * The amdgpu driver provides a sysfs API for reporting current total VRAM
 120  * available on the device
 121  * The file mem_info_vram_used is used for this and returns the total
 122  * amount of currently used VRAM in bytes
 123  */
 124 static ssize_t amdgpu_mem_info_vram_used_show(struct device *dev,
 125                                               struct device_attribute *attr,
 126                                               char *buf)
 127 {
 128         struct drm_device *ddev = dev_get_drvdata(dev);
 129         struct amdgpu_device *adev = drm_to_adev(ddev);
 130         struct ttm_resource_manager *man = &adev->mman.vram_mgr.manager;
 131
 132         return sysfs_emit(buf, "%llu\n", ttm_resource_manager_usage(man));
 133 }
 134
 135 /**
 136  * DOC: mem_info_vis_vram_used
 137  *
 138  * The amdgpu driver provides a sysfs API for reporting current total of
 139  * used visible VRAM
 140  * The file mem_info_vis_vram_used is used for this and returns the total
 141  * amount of currently used visible VRAM in bytes
 142  */
 143 static ssize_t amdgpu_mem_info_vis_vram_used_show(struct device *dev,
 144                                                   struct device_attribute *attr,
 145                                                   char *buf)
 146 {
 147         struct drm_device *ddev = dev_get_drvdata(dev);
 148         struct amdgpu_device *adev = drm_to_adev(ddev);
 149
 150         return sysfs_emit(buf, "%llu\n",
 151                           amdgpu_vram_mgr_vis_usage(&adev->mman.vram_mgr));
 152 }
 153
 154 /**
 155  * DOC: mem_info_vram_vendor
 156  *
 157  * The amdgpu driver provides a sysfs API for reporting the vendor of the
 158  * installed VRAM
 159  * The file mem_info_vram_vendor is used for this and returns the name of the
 160  * vendor.
 161  */
 162 static ssize_t amdgpu_mem_info_vram_vendor(struct device *dev,
 163                                            struct device_attribute *attr,
 164                                            char *buf)
 165 {
 166         struct drm_device *ddev = dev_get_drvdata(dev);
 167         struct amdgpu_device *adev = drm_to_adev(ddev);
 168
 169         switch (adev->gmc.vram_vendor) {
 170         case SAMSUNG:
 171                 return sysfs_emit(buf, "samsung\n");
 172         case INFINEON:
 173                 return sysfs_emit(buf, "infineon\n");
 174         case ELPIDA:
 175                 return sysfs_emit(buf, "elpida\n");
 176         case ETRON:
 177                 return sysfs_emit(buf, "etron\n");
 178         case NANYA:
 179                 return sysfs_emit(buf, "nanya\n");
 180         case HYNIX:
 181                 return sysfs_emit(buf, "hynix\n");
 182         case MOSEL:
 183                 return sysfs_emit(buf, "mosel\n");
 184         case WINBOND:
 185                 return sysfs_emit(buf, "winbond\n");
 186         case ESMT:
 187                 return sysfs_emit(buf, "esmt\n");
 188         case MICRON:
 189                 return sysfs_emit(buf, "micron\n");
 190         default:
 191                 return sysfs_emit(buf, "unknown\n");
 192         }
 193 }
 194
 195 static DEVICE_ATTR(mem_info_vram_total, S_IRUGO,
 196                    amdgpu_mem_info_vram_total_show, NULL);
 197 static DEVICE_ATTR(mem_info_vis_vram_total, S_IRUGO,
 198                    amdgpu_mem_info_vis_vram_total_show,NULL);
 199 static DEVICE_ATTR(mem_info_vram_used, S_IRUGO,
 200                    amdgpu_mem_info_vram_used_show, NULL);
 201 static DEVICE_ATTR(mem_info_vis_vram_used, S_IRUGO,
 202                    amdgpu_mem_info_vis_vram_used_show, NULL);
 203 static DEVICE_ATTR(mem_info_vram_vendor, S_IRUGO,
 204                    amdgpu_mem_info_vram_vendor, NULL);
 205
 206 static struct attribute *amdgpu_vram_mgr_attributes[] = {
 207         &dev_attr_mem_info_vram_total.attr,
 208         &dev_attr_mem_info_vis_vram_total.attr,
 209         &dev_attr_mem_info_vram_used.attr,
 210         &dev_attr_mem_info_vis_vram_used.attr,
 211         &dev_attr_mem_info_vram_vendor.attr,
 212         NULL
 213 };
 214
 215 const struct attribute_group amdgpu_vram_mgr_attr_group = {
 216         .attrs = amdgpu_vram_mgr_attributes
 217 };
 218
 219 /**
 220  * amdgpu_vram_mgr_vis_size - Calculate visible block size
 221  *
 222  * @adev: amdgpu_device pointer
 223  * @block: DRM BUDDY block structure
 224  *
 225  * Calculate how many bytes of the DRM BUDDY block are inside visible VRAM
 226  */
 227 static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev,
 228                                     struct drm_buddy_block *block)
 229 {
 230         u64 start = amdgpu_vram_mgr_block_start(block);
 231         u64 end = start + amdgpu_vram_mgr_block_size(block);
 232
 233         if (start >= adev->gmc.visible_vram_size)
 234                 return 0;
 235
 236         return (end > adev->gmc.visible_vram_size ?
 237                 adev->gmc.visible_vram_size : end) - start;
 238 }
 239
 240 /**
 241  * amdgpu_vram_mgr_bo_visible_size - CPU visible BO size
 242  *
 243  * @bo: &amdgpu_bo buffer object (must be in VRAM)
 244  *
 245  * Returns:
 246  * How much of the given &amdgpu_bo buffer object lies in CPU visible VRAM.
 247  */
 248 u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo)
 249 {
 250         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 251         struct ttm_resource *res = bo->tbo.resource;
 252         struct amdgpu_vram_mgr_resource *vres = to_amdgpu_vram_mgr_resource(res);
 253         struct drm_buddy_block *block;
 254         u64 usage = 0;
 255
 256         if (amdgpu_gmc_vram_full_visible(&adev->gmc))
 257                 return amdgpu_bo_size(bo);
 258
 259         if (res->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT)
 260                 return 0;
 261
 262         list_for_each_entry(block, &vres->blocks, link)
 263                 usage += amdgpu_vram_mgr_vis_size(adev, block);
 264
 265         return usage;
 266 }
 267
 268 /* Commit the reservation of VRAM pages */
 269 static void amdgpu_vram_mgr_do_reserve(struct ttm_resource_manager *man)
 270 {
 271         struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 272         struct amdgpu_device *adev = to_amdgpu_device(mgr);
 273         struct drm_buddy *mm = &mgr->mm;
 274         struct amdgpu_vram_reservation *rsv, *temp;
 275         struct drm_buddy_block *block;
 276         uint64_t vis_usage;
 277
 278         list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, blocks) {
 279                 if (drm_buddy_alloc_blocks(mm, rsv->start, rsv->start + rsv->size,
 280                                            rsv->size, mm->chunk_size, &rsv->allocated,
 281                                            DRM_BUDDY_RANGE_ALLOCATION))
 282                         continue;
 283
 284                 block = amdgpu_vram_mgr_first_block(&rsv->allocated);
 285                 if (!block)
 286                         continue;
 287
 288                 dev_dbg(adev->dev, "Reservation 0x%llx - %lld, Succeeded\n",
 289                         rsv->start, rsv->size);
 290
 291                 vis_usage = amdgpu_vram_mgr_vis_size(adev, block);
 292                 atomic64_add(vis_usage, &mgr->vis_usage);
 293                 spin_lock(&man->bdev->lru_lock);
 294                 man->usage += rsv->size;
 295                 spin_unlock(&man->bdev->lru_lock);
 296                 list_move(&rsv->blocks, &mgr->reserved_pages);
 297         }
 298 }
 299
 300 /**
 301  * amdgpu_vram_mgr_reserve_range - Reserve a range from VRAM
 302  *
 303  * @mgr: amdgpu_vram_mgr pointer
 304  * @start: start address of the range in VRAM
 305  * @size: size of the range
 306  *
 307  * Reserve memory from start address with the specified size in VRAM
 308  */
 309 int amdgpu_vram_mgr_reserve_range(struct amdgpu_vram_mgr *mgr,
 310                                   uint64_t start, uint64_t size)
 311 {
 312         struct amdgpu_vram_reservation *rsv;
 313
 314         rsv = kzalloc(sizeof(*rsv), GFP_KERNEL);
 315         if (!rsv)
 316                 return -ENOMEM;
 317
 318         INIT_LIST_HEAD(&rsv->allocated);
 319         INIT_LIST_HEAD(&rsv->blocks);
 320
 321         rsv->start = start;
 322         rsv->size = size;
 323
 324         mutex_lock(&mgr->lock);
 325         list_add_tail(&rsv->blocks, &mgr->reservations_pending);
 326         amdgpu_vram_mgr_do_reserve(&mgr->manager);
 327         mutex_unlock(&mgr->lock);
 328
 329         return 0;
 330 }
 331
 332 /**
 333  * amdgpu_vram_mgr_query_page_status - query the reservation status
 334  *
 335  * @mgr: amdgpu_vram_mgr pointer
 336  * @start: start address of a page in VRAM
 337  *
 338  * Returns:
 339  *      -EBUSY: the page is still hold and in pending list
 340  *      0: the page has been reserved
 341  *      -ENOENT: the input page is not a reservation
 342  */
 343 int amdgpu_vram_mgr_query_page_status(struct amdgpu_vram_mgr *mgr,
 344                                       uint64_t start)
 345 {
 346         struct amdgpu_vram_reservation *rsv;
 347         int ret;
 348
 349         mutex_lock(&mgr->lock);
 350
 351         list_for_each_entry(rsv, &mgr->reservations_pending, blocks) {
 352                 if (rsv->start <= start &&
 353                     (start < (rsv->start + rsv->size))) {
 354                         ret = -EBUSY;
 355                         goto out;
 356                 }
 357         }
 358
 359         list_for_each_entry(rsv, &mgr->reserved_pages, blocks) {
 360                 if (rsv->start <= start &&
 361                     (start < (rsv->start + rsv->size))) {
 362                         ret = 0;
 363                         goto out;
 364                 }
 365         }
 366
 367         ret = -ENOENT;
 368 out:
 369         mutex_unlock(&mgr->lock);
 370         return ret;
 371 }
 372
 373 /**
 374  * amdgpu_vram_mgr_new - allocate new ranges
 375  *
 376  * @man: TTM memory type manager
 377  * @tbo: TTM BO we need this range for
 378  * @place: placement flags and restrictions
 379  * @res: the resulting mem object
 380  *
 381  * Allocate VRAM for the given BO.
 382  */
 383 static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
 384                                struct ttm_buffer_object *tbo,
 385                                const struct ttm_place *place,
 386                                struct ttm_resource **res)
 387 {
 388         u64 vis_usage = 0, max_bytes, cur_size, min_block_size;
 389         struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 390         struct amdgpu_device *adev = to_amdgpu_device(mgr);
 391         struct amdgpu_vram_mgr_resource *vres;
 392         u64 size, remaining_size, lpfn, fpfn;
 393         struct drm_buddy *mm = &mgr->mm;
 394         struct drm_buddy_block *block;
 395         unsigned long pages_per_block;
 396         int r;
 397
 398         lpfn = (u64)place->lpfn << PAGE_SHIFT;
 399         if (!lpfn)
 400                 lpfn = man->size;
 401
 402         fpfn = (u64)place->fpfn << PAGE_SHIFT;
 403
 404         max_bytes = adev->gmc.mc_vram_size;
 405         if (tbo->type != ttm_bo_type_kernel)
 406                 max_bytes -= AMDGPU_VM_RESERVED_VRAM;
 407
 408         if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
 409                 pages_per_block = ~0ul;
 410         } else {
 411 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 412                 pages_per_block = HPAGE_PMD_NR;
 413 #else
 414                 /* default to 2MB */
 415                 pages_per_block = 2UL << (20UL - PAGE_SHIFT);
 416 #endif
 417                 pages_per_block = max_t(uint32_t, pages_per_block,
 418                                         tbo->page_alignment);
 419         }
 420
 421         vres = kzalloc(sizeof(*vres), GFP_KERNEL);
 422         if (!vres)
 423                 return -ENOMEM;
 424
 425         ttm_resource_init(tbo, place, &vres->base);
 426
 427         /* bail out quickly if there's likely not enough VRAM for this BO */
 428         if (ttm_resource_manager_usage(man) > max_bytes) {
 429                 r = -ENOSPC;
 430                 goto error_fini;
 431         }
 432
 433         INIT_LIST_HEAD(&vres->blocks);
 434
 435         if (place->flags & TTM_PL_FLAG_TOPDOWN)
 436                 vres->flags |= DRM_BUDDY_TOPDOWN_ALLOCATION;
 437
 438         if (fpfn || lpfn != mgr->mm.size)
 439                 /* Allocate blocks in desired range */
 440                 vres->flags |= DRM_BUDDY_RANGE_ALLOCATION;
 441
 442         remaining_size = (u64)vres->base.num_pages << PAGE_SHIFT;
 443
 444         mutex_lock(&mgr->lock);
 445         while (remaining_size) {
 446                 if (tbo->page_alignment)
 447                         min_block_size = (u64)tbo->page_alignment << PAGE_SHIFT;
 448                 else
 449                         min_block_size = mgr->default_page_size;
 450
 451                 BUG_ON(min_block_size < mm->chunk_size);
 452
 453                 /* Limit maximum size to 2GiB due to SG table limitations */
 454                 size = min(remaining_size, 2ULL << 30);
 455
 456                 if (size >= (u64)pages_per_block << PAGE_SHIFT)
 457                         min_block_size = (u64)pages_per_block << PAGE_SHIFT;
 458
 459                 cur_size = size;
 460
 461                 if (fpfn + size != (u64)place->lpfn << PAGE_SHIFT) {
 462                         /*
 463                          * Except for actual range allocation, modify the size and
 464                          * min_block_size conforming to continuous flag enablement
 465                          */
 466                         if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
 467                                 size = roundup_pow_of_two(size);
 468                                 min_block_size = size;
 469                         /*
 470                          * Modify the size value if size is not
 471                          * aligned with min_block_size
 472                          */
 473                         } else if (!IS_ALIGNED(size, min_block_size)) {
 474                                 size = round_up(size, min_block_size);
 475                         }
 476                 }
 477
 478                 r = drm_buddy_alloc_blocks(mm, fpfn,
 479                                            lpfn,
 480                                            size,
 481                                            min_block_size,
 482                                            &vres->blocks,
 483                                            vres->flags);
 484                 if (unlikely(r))
 485                         goto error_free_blocks;
 486
 487                 if (size > remaining_size)
 488                         remaining_size = 0;
 489                 else
 490                         remaining_size -= size;
 491         }
 492         mutex_unlock(&mgr->lock);
 493
 494         if (cur_size != size) {
 495                 struct drm_buddy_block *block;
 496                 struct list_head *trim_list;
 497                 u64 original_size;
 498                 LIST_HEAD(temp);
 499
 500                 trim_list = &vres->blocks;
 501                 original_size = (u64)vres->base.num_pages << PAGE_SHIFT;
 502
 503                 /*
 504                  * If size value is rounded up to min_block_size, trim the last
 505                  * block to the required size
 506                  */
 507                 if (!list_is_singular(&vres->blocks)) {
 508                         block = list_last_entry(&vres->blocks, typeof(*block), link);
 509                         list_move_tail(&block->link, &temp);
 510                         trim_list = &temp;
 511                         /*
 512                          * Compute the original_size value by subtracting the
 513                          * last block size with (aligned size - original size)
 514                          */
 515                         original_size = amdgpu_vram_mgr_block_size(block) - (size - cur_size);
 516                 }
 517
 518                 mutex_lock(&mgr->lock);
 519                 drm_buddy_block_trim(mm,
 520                                      original_size,
 521                                      trim_list);
 522                 mutex_unlock(&mgr->lock);
 523
 524                 if (!list_empty(&temp))
 525                         list_splice_tail(trim_list, &vres->blocks);
 526         }
 527
 528         vres->base.start = 0;
 529         list_for_each_entry(block, &vres->blocks, link) {
 530                 unsigned long start;
 531
 532                 start = amdgpu_vram_mgr_block_start(block) +
 533                         amdgpu_vram_mgr_block_size(block);
 534                 start >>= PAGE_SHIFT;
 535
 536                 if (start > vres->base.num_pages)
 537                         start -= vres->base.num_pages;
 538                 else
 539                         start = 0;
 540                 vres->base.start = max(vres->base.start, start);
 541
 542                 vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
 543         }
 544
 545         if (amdgpu_is_vram_mgr_blocks_contiguous(&vres->blocks))
 546                 vres->base.placement |= TTM_PL_FLAG_CONTIGUOUS;
 547
 548         if (adev->gmc.xgmi.connected_to_cpu)
 549                 vres->base.bus.caching = ttm_cached;
 550         else
 551                 vres->base.bus.caching = ttm_write_combined;
 552
 553         atomic64_add(vis_usage, &mgr->vis_usage);
 554         *res = &vres->base;
 555         return 0;
 556
 557 error_free_blocks:
 558         drm_buddy_free_list(mm, &vres->blocks);
 559         mutex_unlock(&mgr->lock);
 560 error_fini:
 561         ttm_resource_fini(man, &vres->base);
 562         kfree(vres);
 563
 564         return r;
 565 }
 566
 567 /**
 568  * amdgpu_vram_mgr_del - free ranges
 569  *
 570  * @man: TTM memory type manager
 571  * @res: TTM memory object
 572  *
 573  * Free the allocated VRAM again.
 574  */
 575 static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man,
 576                                 struct ttm_resource *res)
 577 {
 578         struct amdgpu_vram_mgr_resource *vres = to_amdgpu_vram_mgr_resource(res);
 579         struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 580         struct amdgpu_device *adev = to_amdgpu_device(mgr);
 581         struct drm_buddy *mm = &mgr->mm;
 582         struct drm_buddy_block *block;
 583         uint64_t vis_usage = 0;
 584
 585         mutex_lock(&mgr->lock);
 586         list_for_each_entry(block, &vres->blocks, link)
 587                 vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
 588
 589         amdgpu_vram_mgr_do_reserve(man);
 590
 591         drm_buddy_free_list(mm, &vres->blocks);
 592         mutex_unlock(&mgr->lock);
 593
 594         atomic64_sub(vis_usage, &mgr->vis_usage);
 595
 596         ttm_resource_fini(man, res);
 597         kfree(vres);
 598 }
 599
 600 /**
 601  * amdgpu_vram_mgr_alloc_sgt - allocate and fill a sg table
 602  *
 603  * @adev: amdgpu device pointer
 604  * @res: TTM memory object
 605  * @offset: byte offset from the base of VRAM BO
 606  * @length: number of bytes to export in sg_table
 607  * @dev: the other device
 608  * @dir: dma direction
 609  * @sgt: resulting sg table
 610  *
 611  * Allocate and fill a sg table from a VRAM allocation.
 612  */
 613 int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev,
 614                               struct ttm_resource *res,
 615                               u64 offset, u64 length,
 616                               struct device *dev,
 617                               enum dma_data_direction dir,
 618                               struct sg_table **sgt)
 619 {
 620         struct amdgpu_res_cursor cursor;
 621         struct scatterlist *sg;
 622         int num_entries = 0;
 623         int i, r;
 624
 625         *sgt = kmalloc(sizeof(**sgt), GFP_KERNEL);
 626         if (!*sgt)
 627                 return -ENOMEM;
 628
 629         /* Determine the number of DRM_BUDDY blocks to export */
 630         amdgpu_res_first(res, offset, length, &cursor);
 631         while (cursor.remaining) {
 632                 num_entries++;
 633                 amdgpu_res_next(&cursor, cursor.size);
 634         }
 635
 636         r = sg_alloc_table(*sgt, num_entries, GFP_KERNEL);
 637         if (r)
 638                 goto error_free;
 639
 640         /* Initialize scatterlist nodes of sg_table */
 641         for_each_sgtable_sg((*sgt), sg, i)
 642                 sg->length = 0;
 643
 644         /*
 645          * Walk down DRM_BUDDY blocks to populate scatterlist nodes
 646          * @note: Use iterator api to get first the DRM_BUDDY block
 647          * and the number of bytes from it. Access the following
 648          * DRM_BUDDY block(s) if more buffer needs to exported
 649          */
 650         amdgpu_res_first(res, offset, length, &cursor);
 651         for_each_sgtable_sg((*sgt), sg, i) {
 652                 phys_addr_t phys = cursor.start + adev->gmc.aper_base;
 653                 size_t size = cursor.size;
 654                 dma_addr_t addr;
 655
 656                 addr = dma_map_resource(dev, phys, size, dir,
 657                                         DMA_ATTR_SKIP_CPU_SYNC);
 658                 r = dma_mapping_error(dev, addr);
 659                 if (r)
 660                         goto error_unmap;
 661
 662                 sg_set_page(sg, NULL, size, 0);
 663                 sg_dma_address(sg) = addr;
 664                 sg_dma_len(sg) = size;
 665
 666                 amdgpu_res_next(&cursor, cursor.size);
 667         }
 668
 669         return 0;
 670
 671 error_unmap:
 672         for_each_sgtable_sg((*sgt), sg, i) {
 673                 if (!sg->length)
 674                         continue;
 675
 676                 dma_unmap_resource(dev, sg->dma_address,
 677                                    sg->length, dir,
 678                                    DMA_ATTR_SKIP_CPU_SYNC);
 679         }
 680         sg_free_table(*sgt);
 681
 682 error_free:
 683         kfree(*sgt);
 684         return r;
 685 }
 686
 687 /**
 688  * amdgpu_vram_mgr_free_sgt - allocate and fill a sg table
 689  *
 690  * @dev: device pointer
 691  * @dir: data direction of resource to unmap
 692  * @sgt: sg table to free
 693  *
 694  * Free a previously allocate sg table.
 695  */
 696 void amdgpu_vram_mgr_free_sgt(struct device *dev,
 697                               enum dma_data_direction dir,
 698                               struct sg_table *sgt)
 699 {
 700         struct scatterlist *sg;
 701         int i;
 702
 703         for_each_sgtable_sg(sgt, sg, i)
 704                 dma_unmap_resource(dev, sg->dma_address,
 705                                    sg->length, dir,
 706                                    DMA_ATTR_SKIP_CPU_SYNC);
 707         sg_free_table(sgt);
 708         kfree(sgt);
 709 }
 710
 711 /**
 712  * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part
 713  *
 714  * @mgr: amdgpu_vram_mgr pointer
 715  *
 716  * Returns how many bytes are used in the visible part of VRAM
 717  */
 718 uint64_t amdgpu_vram_mgr_vis_usage(struct amdgpu_vram_mgr *mgr)
 719 {
 720         return atomic64_read(&mgr->vis_usage);
 721 }
 722
 723 /**
 724  * amdgpu_vram_mgr_intersects - test each drm buddy block for intersection
 725  *
 726  * @man: TTM memory type manager
 727  * @res: The resource to test
 728  * @place: The place to test against
 729  * @size: Size of the new allocation
 730  *
 731  * Test each drm buddy block for intersection for eviction decision.
 732  */
 733 static bool amdgpu_vram_mgr_intersects(struct ttm_resource_manager *man,
 734                                        struct ttm_resource *res,
 735                                        const struct ttm_place *place,
 736                                        size_t size)
 737 {
 738         struct amdgpu_vram_mgr_resource *mgr = to_amdgpu_vram_mgr_resource(res);
 739         struct drm_buddy_block *block;
 740
 741         /* Check each drm buddy block individually */
 742         list_for_each_entry(block, &mgr->blocks, link) {
 743                 unsigned long fpfn =
 744                         amdgpu_vram_mgr_block_start(block) >> PAGE_SHIFT;
 745                 unsigned long lpfn = fpfn +
 746                         (amdgpu_vram_mgr_block_size(block) >> PAGE_SHIFT);
 747
 748                 if (place->fpfn < lpfn &&
 749                     (!place->lpfn || place->lpfn > fpfn))
 750                         return true;
 751         }
 752
 753         return false;
 754 }
 755
 756 /**
 757  * amdgpu_vram_mgr_compatible - test each drm buddy block for compatibility
 758  *
 759  * @man: TTM memory type manager
 760  * @res: The resource to test
 761  * @place: The place to test against
 762  * @size: Size of the new allocation
 763  *
 764  * Test each drm buddy block for placement compatibility.
 765  */
 766 static bool amdgpu_vram_mgr_compatible(struct ttm_resource_manager *man,
 767                                        struct ttm_resource *res,
 768                                        const struct ttm_place *place,
 769                                        size_t size)
 770 {
 771         struct amdgpu_vram_mgr_resource *mgr = to_amdgpu_vram_mgr_resource(res);
 772         struct drm_buddy_block *block;
 773
 774         /* Check each drm buddy block individually */
 775         list_for_each_entry(block, &mgr->blocks, link) {
 776                 unsigned long fpfn =
 777                         amdgpu_vram_mgr_block_start(block) >> PAGE_SHIFT;
 778                 unsigned long lpfn = fpfn +
 779                         (amdgpu_vram_mgr_block_size(block) >> PAGE_SHIFT);
 780
 781                 if (fpfn < place->fpfn ||
 782                     (place->lpfn && lpfn > place->lpfn))
 783                         return false;
 784         }
 785
 786         return true;
 787 }
 788
 789 /**
 790  * amdgpu_vram_mgr_debug - dump VRAM table
 791  *
 792  * @man: TTM memory type manager
 793  * @printer: DRM printer to use
 794  *
 795  * Dump the table content using printk.
 796  */
 797 static void amdgpu_vram_mgr_debug(struct ttm_resource_manager *man,
 798                                   struct drm_printer *printer)
 799 {
 800         struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 801         struct drm_buddy *mm = &mgr->mm;
 802         struct drm_buddy_block *block;
 803
 804         drm_printf(printer, "  vis usage:%llu\n",
 805                    amdgpu_vram_mgr_vis_usage(mgr));
 806
 807         mutex_lock(&mgr->lock);
 808         drm_printf(printer, "default_page_size: %lluKiB\n",
 809                    mgr->default_page_size >> 10);
 810
 811         drm_buddy_print(mm, printer);
 812
 813         drm_printf(printer, "reserved:\n");
 814         list_for_each_entry(block, &mgr->reserved_pages, link)
 815                 drm_buddy_block_print(mm, block, printer);
 816         mutex_unlock(&mgr->lock);
 817 }
 818
 819 static const struct ttm_resource_manager_func amdgpu_vram_mgr_func = {
 820         .alloc  = amdgpu_vram_mgr_new,
 821         .free   = amdgpu_vram_mgr_del,
 822         .intersects = amdgpu_vram_mgr_intersects,
 823         .compatible = amdgpu_vram_mgr_compatible,
 824         .debug  = amdgpu_vram_mgr_debug
 825 };
 826
 827 /**
 828  * amdgpu_vram_mgr_init - init VRAM manager and DRM MM
 829  *
 830  * @adev: amdgpu_device pointer
 831  *
 832  * Allocate and initialize the VRAM manager.
 833  */
 834 int amdgpu_vram_mgr_init(struct amdgpu_device *adev)
 835 {
 836         struct amdgpu_vram_mgr *mgr = &adev->mman.vram_mgr;
 837         struct ttm_resource_manager *man = &mgr->manager;
 838         int err;
 839
 840         ttm_resource_manager_init(man, &adev->mman.bdev,
 841                                   adev->gmc.real_vram_size);
 842
 843         man->func = &amdgpu_vram_mgr_func;
 844
 845         err = drm_buddy_init(&mgr->mm, man->size, PAGE_SIZE);
 846         if (err)
 847                 return err;
 848
 849         mutex_init(&mgr->lock);
 850         INIT_LIST_HEAD(&mgr->reservations_pending);
 851         INIT_LIST_HEAD(&mgr->reserved_pages);
 852         mgr->default_page_size = PAGE_SIZE;
 853
 854         ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, &mgr->manager);
 855         ttm_resource_manager_set_used(man, true);
 856         return 0;
 857 }
 858
 859 /**
 860  * amdgpu_vram_mgr_fini - free and destroy VRAM manager
 861  *
 862  * @adev: amdgpu_device pointer
 863  *
 864  * Destroy and free the VRAM manager, returns -EBUSY if ranges are still
 865  * allocated inside it.
 866  */
 867 void amdgpu_vram_mgr_fini(struct amdgpu_device *adev)
 868 {
 869         struct amdgpu_vram_mgr *mgr = &adev->mman.vram_mgr;
 870         struct ttm_resource_manager *man = &mgr->manager;
 871         int ret;
 872         struct amdgpu_vram_reservation *rsv, *temp;
 873
 874         ttm_resource_manager_set_used(man, false);
 875
 876         ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
 877         if (ret)
 878                 return;
 879
 880         mutex_lock(&mgr->lock);
 881         list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, blocks)
 882                 kfree(rsv);
 883
 884         list_for_each_entry_safe(rsv, temp, &mgr->reserved_pages, blocks) {
 885                 drm_buddy_free_list(&mgr->mm, &rsv->allocated);
 886                 kfree(rsv);
 887         }
 888         drm_buddy_fini(&mgr->mm);
 889         mutex_unlock(&mgr->lock);
 890
 891         ttm_resource_manager_cleanup(man);
 892         ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, NULL);
 893 }