kernel/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

   1 /*
   2  * Copyright 2009 Jerome Glisse.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * The above copyright notice and this permission notice (including the
  22  * next paragraph) shall be included in all copies or substantial portions
  23  * of the Software.
  24  *
  25  */
  26 /*
  27  * Authors:
  28  *    Jerome Glisse <glisse@freedesktop.org>
  29  *    Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
  30  *    Dave Airlie
  31  */
  32 #include <ttm/ttm_bo_api.h>
  33 #include <ttm/ttm_bo_driver.h>
  34 #include <ttm/ttm_placement.h>
  35 #include <ttm/ttm_module.h>
  36 #include <ttm/ttm_page_alloc.h>
  37 #include <drm/drmP.h>
  38 #include <drm/amdgpu_drm.h>
  39 #include <linux/seq_file.h>
  40 #include <linux/slab.h>
  41 #include <linux/swiotlb.h>
  42 #include <linux/swap.h>
  43 #include <linux/pagemap.h>
  44 #include <linux/debugfs.h>
  45 #include "amdgpu.h"
  46 #include "bif/bif_4_1_d.h"
  47
  48 #define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
  49
  50 static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev);
  51 static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev);
  52
  53 static struct amdgpu_device *amdgpu_get_adev(struct ttm_bo_device *bdev)
  54 {
  55         struct amdgpu_mman *mman;
  56         struct amdgpu_device *adev;
  57
  58         mman = container_of(bdev, struct amdgpu_mman, bdev);
  59         adev = container_of(mman, struct amdgpu_device, mman);
  60         return adev;
  61 }
  62
  63
  64 /*
  65  * Global memory.
  66  */
  67 static int amdgpu_ttm_mem_global_init(struct drm_global_reference *ref)
  68 {
  69         return ttm_mem_global_init(ref->object);
  70 }
  71
  72 static void amdgpu_ttm_mem_global_release(struct drm_global_reference *ref)
  73 {
  74         ttm_mem_global_release(ref->object);
  75 }
  76
  77 static int amdgpu_ttm_global_init(struct amdgpu_device *adev)
  78 {
  79         struct drm_global_reference *global_ref;
  80         int r;
  81
  82         adev->mman.mem_global_referenced = false;
  83         global_ref = &adev->mman.mem_global_ref;
  84         global_ref->global_type = DRM_GLOBAL_TTM_MEM;
  85         global_ref->size = sizeof(struct ttm_mem_global);
  86         global_ref->init = &amdgpu_ttm_mem_global_init;
  87         global_ref->release = &amdgpu_ttm_mem_global_release;
  88         r = drm_global_item_ref(global_ref);
  89         if (r != 0) {
  90                 DRM_ERROR("Failed setting up TTM memory accounting "
  91                           "subsystem.\n");
  92                 return r;
  93         }
  94
  95         adev->mman.bo_global_ref.mem_glob =
  96                 adev->mman.mem_global_ref.object;
  97         global_ref = &adev->mman.bo_global_ref.ref;
  98         global_ref->global_type = DRM_GLOBAL_TTM_BO;
  99         global_ref->size = sizeof(struct ttm_bo_global);
 100         global_ref->init = &ttm_bo_global_init;
 101         global_ref->release = &ttm_bo_global_release;
 102         r = drm_global_item_ref(global_ref);
 103         if (r != 0) {
 104                 DRM_ERROR("Failed setting up TTM BO subsystem.\n");
 105                 drm_global_item_unref(&adev->mman.mem_global_ref);
 106                 return r;
 107         }
 108
 109         adev->mman.mem_global_referenced = true;
 110         return 0;
 111 }
 112
 113 static void amdgpu_ttm_global_fini(struct amdgpu_device *adev)
 114 {
 115         if (adev->mman.mem_global_referenced) {
 116                 drm_global_item_unref(&adev->mman.bo_global_ref.ref);
 117                 drm_global_item_unref(&adev->mman.mem_global_ref);
 118                 adev->mman.mem_global_referenced = false;
 119         }
 120 }
 121
 122 static int amdgpu_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
 123 {
 124         return 0;
 125 }
 126
 127 static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 128                                 struct ttm_mem_type_manager *man)
 129 {
 130         struct amdgpu_device *adev;
 131
 132         adev = amdgpu_get_adev(bdev);
 133
 134         switch (type) {
 135         case TTM_PL_SYSTEM:
 136                 /* System memory */
 137                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 138                 man->available_caching = TTM_PL_MASK_CACHING;
 139                 man->default_caching = TTM_PL_FLAG_CACHED;
 140                 break;
 141         case TTM_PL_TT:
 142                 man->func = &ttm_bo_manager_func;
 143                 man->gpu_offset = adev->mc.gtt_start;
 144                 man->available_caching = TTM_PL_MASK_CACHING;
 145                 man->default_caching = TTM_PL_FLAG_CACHED;
 146                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE | TTM_MEMTYPE_FLAG_CMA;
 147                 break;
 148         case TTM_PL_VRAM:
 149                 /* "On-card" video ram */
 150                 man->func = &ttm_bo_manager_func;
 151                 man->gpu_offset = adev->mc.vram_start;
 152                 man->flags = TTM_MEMTYPE_FLAG_FIXED |
 153                              TTM_MEMTYPE_FLAG_MAPPABLE;
 154                 man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
 155                 man->default_caching = TTM_PL_FLAG_WC;
 156                 break;
 157         case AMDGPU_PL_GDS:
 158         case AMDGPU_PL_GWS:
 159         case AMDGPU_PL_OA:
 160                 /* On-chip GDS memory*/
 161                 man->func = &ttm_bo_manager_func;
 162                 man->gpu_offset = 0;
 163                 man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_CMA;
 164                 man->available_caching = TTM_PL_FLAG_UNCACHED;
 165                 man->default_caching = TTM_PL_FLAG_UNCACHED;
 166                 break;
 167         default:
 168                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 169                 return -EINVAL;
 170         }
 171         return 0;
 172 }
 173
 174 static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
 175                                 struct ttm_placement *placement)
 176 {
 177         struct amdgpu_bo *rbo;
 178         static struct ttm_place placements = {
 179                 .fpfn = 0,
 180                 .lpfn = 0,
 181                 .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM
 182         };
 183
 184         if (!amdgpu_ttm_bo_is_amdgpu_bo(bo)) {
 185                 placement->placement = &placements;
 186                 placement->busy_placement = &placements;
 187                 placement->num_placement = 1;
 188                 placement->num_busy_placement = 1;
 189                 return;
 190         }
 191         rbo = container_of(bo, struct amdgpu_bo, tbo);
 192         switch (bo->mem.mem_type) {
 193         case TTM_PL_VRAM:
 194                 if (rbo->adev->mman.buffer_funcs_ring->ready == false)
 195                         amdgpu_ttm_placement_from_domain(rbo, AMDGPU_GEM_DOMAIN_CPU);
 196                 else
 197                         amdgpu_ttm_placement_from_domain(rbo, AMDGPU_GEM_DOMAIN_GTT);
 198                 break;
 199         case TTM_PL_TT:
 200         default:
 201                 amdgpu_ttm_placement_from_domain(rbo, AMDGPU_GEM_DOMAIN_CPU);
 202         }
 203         *placement = rbo->placement;
 204 }
 205
 206 static int amdgpu_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 207 {
 208         struct amdgpu_bo *rbo = container_of(bo, struct amdgpu_bo, tbo);
 209
 210         return drm_vma_node_verify_access(&rbo->gem_base.vma_node, filp);
 211 }
 212
 213 static void amdgpu_move_null(struct ttm_buffer_object *bo,
 214                              struct ttm_mem_reg *new_mem)
 215 {
 216         struct ttm_mem_reg *old_mem = &bo->mem;
 217
 218         BUG_ON(old_mem->mm_node != NULL);
 219         *old_mem = *new_mem;
 220         new_mem->mm_node = NULL;
 221 }
 222
 223 static int amdgpu_move_blit(struct ttm_buffer_object *bo,
 224                         bool evict, bool no_wait_gpu,
 225                         struct ttm_mem_reg *new_mem,
 226                         struct ttm_mem_reg *old_mem)
 227 {
 228         struct amdgpu_device *adev;
 229         struct amdgpu_ring *ring;
 230         uint64_t old_start, new_start;
 231         struct fence *fence;
 232         int r;
 233
 234         adev = amdgpu_get_adev(bo->bdev);
 235         ring = adev->mman.buffer_funcs_ring;
 236         old_start = old_mem->start << PAGE_SHIFT;
 237         new_start = new_mem->start << PAGE_SHIFT;
 238
 239         switch (old_mem->mem_type) {
 240         case TTM_PL_VRAM:
 241                 old_start += adev->mc.vram_start;
 242                 break;
 243         case TTM_PL_TT:
 244                 old_start += adev->mc.gtt_start;
 245                 break;
 246         default:
 247                 DRM_ERROR("Unknown placement %d\n", old_mem->mem_type);
 248                 return -EINVAL;
 249         }
 250         switch (new_mem->mem_type) {
 251         case TTM_PL_VRAM:
 252                 new_start += adev->mc.vram_start;
 253                 break;
 254         case TTM_PL_TT:
 255                 new_start += adev->mc.gtt_start;
 256                 break;
 257         default:
 258                 DRM_ERROR("Unknown placement %d\n", old_mem->mem_type);
 259                 return -EINVAL;
 260         }
 261         if (!ring->ready) {
 262                 DRM_ERROR("Trying to move memory with ring turned off.\n");
 263                 return -EINVAL;
 264         }
 265
 266         BUILD_BUG_ON((PAGE_SIZE % AMDGPU_GPU_PAGE_SIZE) != 0);
 267
 268         r = amdgpu_copy_buffer(ring, old_start, new_start,
 269                                new_mem->num_pages * PAGE_SIZE, /* bytes */
 270                                bo->resv, &fence);
 271         /* FIXME: handle copy error */
 272         r = ttm_bo_move_accel_cleanup(bo, fence,
 273                                       evict, no_wait_gpu, new_mem);
 274         fence_put(fence);
 275         return r;
 276 }
 277
 278 static int amdgpu_move_vram_ram(struct ttm_buffer_object *bo,
 279                                 bool evict, bool interruptible,
 280                                 bool no_wait_gpu,
 281                                 struct ttm_mem_reg *new_mem)
 282 {
 283         struct amdgpu_device *adev;
 284         struct ttm_mem_reg *old_mem = &bo->mem;
 285         struct ttm_mem_reg tmp_mem;
 286         struct ttm_place placements;
 287         struct ttm_placement placement;
 288         int r;
 289
 290         adev = amdgpu_get_adev(bo->bdev);
 291         tmp_mem = *new_mem;
 292         tmp_mem.mm_node = NULL;
 293         placement.num_placement = 1;
 294         placement.placement = &placements;
 295         placement.num_busy_placement = 1;
 296         placement.busy_placement = &placements;
 297         placements.fpfn = 0;
 298         placements.lpfn = 0;
 299         placements.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT;
 300         r = ttm_bo_mem_space(bo, &placement, &tmp_mem,
 301                              interruptible, no_wait_gpu);
 302         if (unlikely(r)) {
 303                 return r;
 304         }
 305
 306         r = ttm_tt_set_placement_caching(bo->ttm, tmp_mem.placement);
 307         if (unlikely(r)) {
 308                 goto out_cleanup;
 309         }
 310
 311         r = ttm_tt_bind(bo->ttm, &tmp_mem);
 312         if (unlikely(r)) {
 313                 goto out_cleanup;
 314         }
 315         r = amdgpu_move_blit(bo, true, no_wait_gpu, &tmp_mem, old_mem);
 316         if (unlikely(r)) {
 317                 goto out_cleanup;
 318         }
 319         r = ttm_bo_move_ttm(bo, true, no_wait_gpu, new_mem);
 320 out_cleanup:
 321         ttm_bo_mem_put(bo, &tmp_mem);
 322         return r;
 323 }
 324
 325 static int amdgpu_move_ram_vram(struct ttm_buffer_object *bo,
 326                                 bool evict, bool interruptible,
 327                                 bool no_wait_gpu,
 328                                 struct ttm_mem_reg *new_mem)
 329 {
 330         struct amdgpu_device *adev;
 331         struct ttm_mem_reg *old_mem = &bo->mem;
 332         struct ttm_mem_reg tmp_mem;
 333         struct ttm_placement placement;
 334         struct ttm_place placements;
 335         int r;
 336
 337         adev = amdgpu_get_adev(bo->bdev);
 338         tmp_mem = *new_mem;
 339         tmp_mem.mm_node = NULL;
 340         placement.num_placement = 1;
 341         placement.placement = &placements;
 342         placement.num_busy_placement = 1;
 343         placement.busy_placement = &placements;
 344         placements.fpfn = 0;
 345         placements.lpfn = 0;
 346         placements.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT;
 347         r = ttm_bo_mem_space(bo, &placement, &tmp_mem,
 348                              interruptible, no_wait_gpu);
 349         if (unlikely(r)) {
 350                 return r;
 351         }
 352         r = ttm_bo_move_ttm(bo, true, no_wait_gpu, &tmp_mem);
 353         if (unlikely(r)) {
 354                 goto out_cleanup;
 355         }
 356         r = amdgpu_move_blit(bo, true, no_wait_gpu, new_mem, old_mem);
 357         if (unlikely(r)) {
 358                 goto out_cleanup;
 359         }
 360 out_cleanup:
 361         ttm_bo_mem_put(bo, &tmp_mem);
 362         return r;
 363 }
 364
 365 static int amdgpu_bo_move(struct ttm_buffer_object *bo,
 366                         bool evict, bool interruptible,
 367                         bool no_wait_gpu,
 368                         struct ttm_mem_reg *new_mem)
 369 {
 370         struct amdgpu_device *adev;
 371         struct ttm_mem_reg *old_mem = &bo->mem;
 372         int r;
 373
 374         adev = amdgpu_get_adev(bo->bdev);
 375         if (old_mem->mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
 376                 amdgpu_move_null(bo, new_mem);
 377                 return 0;
 378         }
 379         if ((old_mem->mem_type == TTM_PL_TT &&
 380              new_mem->mem_type == TTM_PL_SYSTEM) ||
 381             (old_mem->mem_type == TTM_PL_SYSTEM &&
 382              new_mem->mem_type == TTM_PL_TT)) {
 383                 /* bind is enough */
 384                 amdgpu_move_null(bo, new_mem);
 385                 return 0;
 386         }
 387         if (adev->mman.buffer_funcs == NULL ||
 388             adev->mman.buffer_funcs_ring == NULL ||
 389             !adev->mman.buffer_funcs_ring->ready) {
 390                 /* use memcpy */
 391                 goto memcpy;
 392         }
 393
 394         if (old_mem->mem_type == TTM_PL_VRAM &&
 395             new_mem->mem_type == TTM_PL_SYSTEM) {
 396                 r = amdgpu_move_vram_ram(bo, evict, interruptible,
 397                                         no_wait_gpu, new_mem);
 398         } else if (old_mem->mem_type == TTM_PL_SYSTEM &&
 399                    new_mem->mem_type == TTM_PL_VRAM) {
 400                 r = amdgpu_move_ram_vram(bo, evict, interruptible,
 401                                             no_wait_gpu, new_mem);
 402         } else {
 403                 r = amdgpu_move_blit(bo, evict, no_wait_gpu, new_mem, old_mem);
 404         }
 405
 406         if (r) {
 407 memcpy:
 408                 r = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, new_mem);
 409                 if (r) {
 410                         return r;
 411                 }
 412         }
 413
 414         /* update statistics */
 415         atomic64_add((u64)bo->num_pages << PAGE_SHIFT, &adev->num_bytes_moved);
 416         return 0;
 417 }
 418
 419 static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 420 {
 421         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 422         struct amdgpu_device *adev = amdgpu_get_adev(bdev);
 423
 424         mem->bus.addr = NULL;
 425         mem->bus.offset = 0;
 426         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 427         mem->bus.base = 0;
 428         mem->bus.is_iomem = false;
 429         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 430                 return -EINVAL;
 431         switch (mem->mem_type) {
 432         case TTM_PL_SYSTEM:
 433                 /* system memory */
 434                 return 0;
 435         case TTM_PL_TT:
 436                 break;
 437         case TTM_PL_VRAM:
 438                 mem->bus.offset = mem->start << PAGE_SHIFT;
 439                 /* check if it's visible */
 440                 if ((mem->bus.offset + mem->bus.size) > adev->mc.visible_vram_size)
 441                         return -EINVAL;
 442                 mem->bus.base = adev->mc.aper_base;
 443                 mem->bus.is_iomem = true;
 444 #ifdef __alpha__
 445                 /*
 446                  * Alpha: use bus.addr to hold the ioremap() return,
 447                  * so we can modify bus.base below.
 448                  */
 449                 if (mem->placement & TTM_PL_FLAG_WC)
 450                         mem->bus.addr =
 451                                 ioremap_wc(mem->bus.base + mem->bus.offset,
 452                                            mem->bus.size);
 453                 else
 454                         mem->bus.addr =
 455                                 ioremap_nocache(mem->bus.base + mem->bus.offset,
 456                                                 mem->bus.size);
 457
 458                 /*
 459                  * Alpha: Use just the bus offset plus
 460                  * the hose/domain memory base for bus.base.
 461                  * It then can be used to build PTEs for VRAM
 462                  * access, as done in ttm_bo_vm_fault().
 463                  */
 464                 mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
 465                         adev->ddev->hose->dense_mem_base;
 466 #endif
 467                 break;
 468         default:
 469                 return -EINVAL;
 470         }
 471         return 0;
 472 }
 473
 474 static void amdgpu_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 475 {
 476 }
 477
 478 /*
 479  * TTM backend functions.
 480  */
 481 struct amdgpu_ttm_tt {
 482         struct ttm_dma_tt               ttm;
 483         struct amdgpu_device            *adev;
 484         u64                             offset;
 485         uint64_t                        userptr;
 486         struct mm_struct                *usermm;
 487         uint32_t                        userflags;
 488 };
 489
 490 /* prepare the sg table with the user pages */
 491 static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt *ttm)
 492 {
 493         struct amdgpu_device *adev = amdgpu_get_adev(ttm->bdev);
 494         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 495         unsigned pinned = 0, nents;
 496         int r;
 497
 498         int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
 499         enum dma_data_direction direction = write ?
 500                 DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 501
 502         if (current->mm != gtt->usermm)
 503                 return -EPERM;
 504
 505         if (gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) {
 506                 /* check that we only pin down anonymous memory
 507                    to prevent problems with writeback */
 508                 unsigned long end = gtt->userptr + ttm->num_pages * PAGE_SIZE;
 509                 struct vm_area_struct *vma;
 510
 511                 vma = find_vma(gtt->usermm, gtt->userptr);
 512                 if (!vma || vma->vm_file || vma->vm_end < end)
 513                         return -EPERM;
 514         }
 515
 516         do {
 517                 unsigned num_pages = ttm->num_pages - pinned;
 518                 uint64_t userptr = gtt->userptr + pinned * PAGE_SIZE;
 519                 struct page **pages = ttm->pages + pinned;
 520
 521                 r = get_user_pages(current, current->mm, userptr, num_pages,
 522                                    write, 0, pages, NULL);
 523                 if (r < 0)
 524                         goto release_pages;
 525
 526                 pinned += r;
 527
 528         } while (pinned < ttm->num_pages);
 529
 530         r = sg_alloc_table_from_pages(ttm->sg, ttm->pages, ttm->num_pages, 0,
 531                                       ttm->num_pages << PAGE_SHIFT,
 532                                       GFP_KERNEL);
 533         if (r)
 534                 goto release_sg;
 535
 536         r = -ENOMEM;
 537         nents = dma_map_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
 538         if (nents != ttm->sg->nents)
 539                 goto release_sg;
 540
 541         drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
 542                                          gtt->ttm.dma_address, ttm->num_pages);
 543
 544         return 0;
 545
 546 release_sg:
 547         kfree(ttm->sg);
 548
 549 release_pages:
 550         release_pages(ttm->pages, pinned, 0);
 551         return r;
 552 }
 553
 554 static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
 555 {
 556         struct amdgpu_device *adev = amdgpu_get_adev(ttm->bdev);
 557         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 558         struct sg_page_iter sg_iter;
 559
 560         int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
 561         enum dma_data_direction direction = write ?
 562                 DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 563
 564         /* double check that we don't free the table twice */
 565         if (!ttm->sg->sgl)
 566                 return;
 567
 568         /* free the sg table and pages again */
 569         dma_unmap_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
 570
 571         for_each_sg_page(ttm->sg->sgl, &sg_iter, ttm->sg->nents, 0) {
 572                 struct page *page = sg_page_iter_page(&sg_iter);
 573                 if (!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY))
 574                         set_page_dirty(page);
 575
 576                 mark_page_accessed(page);
 577                 page_cache_release(page);
 578         }
 579
 580         sg_free_table(ttm->sg);
 581 }
 582
 583 static int amdgpu_ttm_backend_bind(struct ttm_tt *ttm,
 584                                    struct ttm_mem_reg *bo_mem)
 585 {
 586         struct amdgpu_ttm_tt *gtt = (void*)ttm;
 587         uint32_t flags = amdgpu_ttm_tt_pte_flags(gtt->adev, ttm, bo_mem);
 588         int r;
 589
 590         if (gtt->userptr) {
 591                 r = amdgpu_ttm_tt_pin_userptr(ttm);
 592                 if (r) {
 593                         DRM_ERROR("failed to pin userptr\n");
 594                         return r;
 595                 }
 596         }
 597         gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
 598         if (!ttm->num_pages) {
 599                 WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
 600                      ttm->num_pages, bo_mem, ttm);
 601         }
 602
 603         if (bo_mem->mem_type == AMDGPU_PL_GDS ||
 604             bo_mem->mem_type == AMDGPU_PL_GWS ||
 605             bo_mem->mem_type == AMDGPU_PL_OA)
 606                 return -EINVAL;
 607
 608         r = amdgpu_gart_bind(gtt->adev, gtt->offset, ttm->num_pages,
 609                 ttm->pages, gtt->ttm.dma_address, flags);
 610
 611         if (r) {
 612                 DRM_ERROR("failed to bind %lu pages at 0x%08X\n",
 613                           ttm->num_pages, (unsigned)gtt->offset);
 614                 return r;
 615         }
 616         return 0;
 617 }
 618
 619 static int amdgpu_ttm_backend_unbind(struct ttm_tt *ttm)
 620 {
 621         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 622
 623         /* unbind shouldn't be done for GDS/GWS/OA in ttm_bo_clean_mm */
 624         if (gtt->adev->gart.ready)
 625                 amdgpu_gart_unbind(gtt->adev, gtt->offset, ttm->num_pages);
 626
 627         if (gtt->userptr)
 628                 amdgpu_ttm_tt_unpin_userptr(ttm);
 629
 630         return 0;
 631 }
 632
 633 static void amdgpu_ttm_backend_destroy(struct ttm_tt *ttm)
 634 {
 635         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 636
 637         ttm_dma_tt_fini(&gtt->ttm);
 638         kfree(gtt);
 639 }
 640
 641 static struct ttm_backend_func amdgpu_backend_func = {
 642         .bind = &amdgpu_ttm_backend_bind,
 643         .unbind = &amdgpu_ttm_backend_unbind,
 644         .destroy = &amdgpu_ttm_backend_destroy,
 645 };
 646
 647 static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_bo_device *bdev,
 648                                     unsigned long size, uint32_t page_flags,
 649                                     struct page *dummy_read_page)
 650 {
 651         struct amdgpu_device *adev;
 652         struct amdgpu_ttm_tt *gtt;
 653
 654         adev = amdgpu_get_adev(bdev);
 655
 656         gtt = kzalloc(sizeof(struct amdgpu_ttm_tt), GFP_KERNEL);
 657         if (gtt == NULL) {
 658                 return NULL;
 659         }
 660         gtt->ttm.ttm.func = &amdgpu_backend_func;
 661         gtt->adev = adev;
 662         if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags, dummy_read_page)) {
 663                 kfree(gtt);
 664                 return NULL;
 665         }
 666         return &gtt->ttm.ttm;
 667 }
 668
 669 static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm)
 670 {
 671         struct amdgpu_device *adev;
 672         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 673         unsigned i;
 674         int r;
 675         bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
 676
 677         if (ttm->state != tt_unpopulated)
 678                 return 0;
 679
 680         if (gtt && gtt->userptr) {
 681                 ttm->sg = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
 682                 if (!ttm->sg)
 683                         return -ENOMEM;
 684
 685                 ttm->page_flags |= TTM_PAGE_FLAG_SG;
 686                 ttm->state = tt_unbound;
 687                 return 0;
 688         }
 689
 690         if (slave && ttm->sg) {
 691                 drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
 692                                                  gtt->ttm.dma_address, ttm->num_pages);
 693                 ttm->state = tt_unbound;
 694                 return 0;
 695         }
 696
 697         adev = amdgpu_get_adev(ttm->bdev);
 698
 699 #ifdef CONFIG_SWIOTLB
 700         if (swiotlb_nr_tbl()) {
 701                 return ttm_dma_populate(&gtt->ttm, adev->dev);
 702         }
 703 #endif
 704
 705         r = ttm_pool_populate(ttm);
 706         if (r) {
 707                 return r;
 708         }
 709
 710         for (i = 0; i < ttm->num_pages; i++) {
 711                 gtt->ttm.dma_address[i] = pci_map_page(adev->pdev, ttm->pages[i],
 712                                                        0, PAGE_SIZE,
 713                                                        PCI_DMA_BIDIRECTIONAL);
 714                 if (pci_dma_mapping_error(adev->pdev, gtt->ttm.dma_address[i])) {
 715                         while (i--) {
 716                                 pci_unmap_page(adev->pdev, gtt->ttm.dma_address[i],
 717                                                PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 718                                 gtt->ttm.dma_address[i] = 0;
 719                         }
 720                         ttm_pool_unpopulate(ttm);
 721                         return -EFAULT;
 722                 }
 723         }
 724         return 0;
 725 }
 726
 727 static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
 728 {
 729         struct amdgpu_device *adev;
 730         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 731         unsigned i;
 732         bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
 733
 734         if (gtt && gtt->userptr) {
 735                 kfree(ttm->sg);
 736                 ttm->page_flags &= ~TTM_PAGE_FLAG_SG;
 737                 return;
 738         }
 739
 740         if (slave)
 741                 return;
 742
 743         adev = amdgpu_get_adev(ttm->bdev);
 744
 745 #ifdef CONFIG_SWIOTLB
 746         if (swiotlb_nr_tbl()) {
 747                 ttm_dma_unpopulate(&gtt->ttm, adev->dev);
 748                 return;
 749         }
 750 #endif
 751
 752         for (i = 0; i < ttm->num_pages; i++) {
 753                 if (gtt->ttm.dma_address[i]) {
 754                         pci_unmap_page(adev->pdev, gtt->ttm.dma_address[i],
 755                                        PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 756                 }
 757         }
 758
 759         ttm_pool_unpopulate(ttm);
 760 }
 761
 762 int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr,
 763                               uint32_t flags)
 764 {
 765         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 766
 767         if (gtt == NULL)
 768                 return -EINVAL;
 769
 770         gtt->userptr = addr;
 771         gtt->usermm = current->mm;
 772         gtt->userflags = flags;
 773         return 0;
 774 }
 775
 776 bool amdgpu_ttm_tt_has_userptr(struct ttm_tt *ttm)
 777 {
 778         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 779
 780         if (gtt == NULL)
 781                 return false;
 782
 783         return !!gtt->userptr;
 784 }
 785
 786 bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
 787                                   unsigned long end)
 788 {
 789         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 790         unsigned long size;
 791
 792         if (gtt == NULL)
 793                 return false;
 794
 795         if (gtt->ttm.ttm.state != tt_bound || !gtt->userptr)
 796                 return false;
 797
 798         size = (unsigned long)gtt->ttm.ttm.num_pages * PAGE_SIZE;
 799         if (gtt->userptr > end || gtt->userptr + size <= start)
 800                 return false;
 801
 802         return true;
 803 }
 804
 805 bool amdgpu_ttm_tt_is_readonly(struct ttm_tt *ttm)
 806 {
 807         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 808
 809         if (gtt == NULL)
 810                 return false;
 811
 812         return !!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
 813 }
 814
 815 uint32_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
 816                                  struct ttm_mem_reg *mem)
 817 {
 818         uint32_t flags = 0;
 819
 820         if (mem && mem->mem_type != TTM_PL_SYSTEM)
 821                 flags |= AMDGPU_PTE_VALID;
 822
 823         if (mem && mem->mem_type == TTM_PL_TT) {
 824                 flags |= AMDGPU_PTE_SYSTEM;
 825
 826                 if (ttm->caching_state == tt_cached)
 827                         flags |= AMDGPU_PTE_SNOOPED;
 828         }
 829
 830         if (adev->asic_type >= CHIP_TONGA)
 831                 flags |= AMDGPU_PTE_EXECUTABLE;
 832
 833         flags |= AMDGPU_PTE_READABLE;
 834
 835         if (!amdgpu_ttm_tt_is_readonly(ttm))
 836                 flags |= AMDGPU_PTE_WRITEABLE;
 837
 838         return flags;
 839 }
 840
 841 static struct ttm_bo_driver amdgpu_bo_driver = {
 842         .ttm_tt_create = &amdgpu_ttm_tt_create,
 843         .ttm_tt_populate = &amdgpu_ttm_tt_populate,
 844         .ttm_tt_unpopulate = &amdgpu_ttm_tt_unpopulate,
 845         .invalidate_caches = &amdgpu_invalidate_caches,
 846         .init_mem_type = &amdgpu_init_mem_type,
 847         .evict_flags = &amdgpu_evict_flags,
 848         .move = &amdgpu_bo_move,
 849         .verify_access = &amdgpu_verify_access,
 850         .move_notify = &amdgpu_bo_move_notify,
 851         .fault_reserve_notify = &amdgpu_bo_fault_reserve_notify,
 852         .io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
 853         .io_mem_free = &amdgpu_ttm_io_mem_free,
 854 };
 855
 856 int amdgpu_ttm_init(struct amdgpu_device *adev)
 857 {
 858         int r;
 859
 860         r = amdgpu_ttm_global_init(adev);
 861         if (r) {
 862                 return r;
 863         }
 864         /* No others user of address space so set it to 0 */
 865         r = ttm_bo_device_init(&adev->mman.bdev,
 866                                adev->mman.bo_global_ref.ref.object,
 867                                &amdgpu_bo_driver,
 868                                adev->ddev->anon_inode->i_mapping,
 869                                DRM_FILE_PAGE_OFFSET,
 870                                adev->need_dma32);
 871         if (r) {
 872                 DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
 873                 return r;
 874         }
 875         adev->mman.initialized = true;
 876         r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_VRAM,
 877                                 adev->mc.real_vram_size >> PAGE_SHIFT);
 878         if (r) {
 879                 DRM_ERROR("Failed initializing VRAM heap.\n");
 880                 return r;
 881         }
 882         /* Change the size here instead of the init above so only lpfn is affected */
 883         amdgpu_ttm_set_active_vram_size(adev, adev->mc.visible_vram_size);
 884
 885         r = amdgpu_bo_create(adev, 256 * 1024, PAGE_SIZE, true,
 886                              AMDGPU_GEM_DOMAIN_VRAM,
 887                              AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED,
 888                              NULL, NULL, &adev->stollen_vga_memory);
 889         if (r) {
 890                 return r;
 891         }
 892         r = amdgpu_bo_reserve(adev->stollen_vga_memory, false);
 893         if (r)
 894                 return r;
 895         r = amdgpu_bo_pin(adev->stollen_vga_memory, AMDGPU_GEM_DOMAIN_VRAM, NULL);
 896         amdgpu_bo_unreserve(adev->stollen_vga_memory);
 897         if (r) {
 898                 amdgpu_bo_unref(&adev->stollen_vga_memory);
 899                 return r;
 900         }
 901         DRM_INFO("amdgpu: %uM of VRAM memory ready\n",
 902                  (unsigned) (adev->mc.real_vram_size / (1024 * 1024)));
 903         r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_TT,
 904                                 adev->mc.gtt_size >> PAGE_SHIFT);
 905         if (r) {
 906                 DRM_ERROR("Failed initializing GTT heap.\n");
 907                 return r;
 908         }
 909         DRM_INFO("amdgpu: %uM of GTT memory ready.\n",
 910                  (unsigned)(adev->mc.gtt_size / (1024 * 1024)));
 911
 912         adev->gds.mem.total_size = adev->gds.mem.total_size << AMDGPU_GDS_SHIFT;
 913         adev->gds.mem.gfx_partition_size = adev->gds.mem.gfx_partition_size << AMDGPU_GDS_SHIFT;
 914         adev->gds.mem.cs_partition_size = adev->gds.mem.cs_partition_size << AMDGPU_GDS_SHIFT;
 915         adev->gds.gws.total_size = adev->gds.gws.total_size << AMDGPU_GWS_SHIFT;
 916         adev->gds.gws.gfx_partition_size = adev->gds.gws.gfx_partition_size << AMDGPU_GWS_SHIFT;
 917         adev->gds.gws.cs_partition_size = adev->gds.gws.cs_partition_size << AMDGPU_GWS_SHIFT;
 918         adev->gds.oa.total_size = adev->gds.oa.total_size << AMDGPU_OA_SHIFT;
 919         adev->gds.oa.gfx_partition_size = adev->gds.oa.gfx_partition_size << AMDGPU_OA_SHIFT;
 920         adev->gds.oa.cs_partition_size = adev->gds.oa.cs_partition_size << AMDGPU_OA_SHIFT;
 921         /* GDS Memory */
 922         r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_GDS,
 923                                 adev->gds.mem.total_size >> PAGE_SHIFT);
 924         if (r) {
 925                 DRM_ERROR("Failed initializing GDS heap.\n");
 926                 return r;
 927         }
 928
 929         /* GWS */
 930         r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_GWS,
 931                                 adev->gds.gws.total_size >> PAGE_SHIFT);
 932         if (r) {
 933                 DRM_ERROR("Failed initializing gws heap.\n");
 934                 return r;
 935         }
 936
 937         /* OA */
 938         r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_OA,
 939                                 adev->gds.oa.total_size >> PAGE_SHIFT);
 940         if (r) {
 941                 DRM_ERROR("Failed initializing oa heap.\n");
 942                 return r;
 943         }
 944
 945         r = amdgpu_ttm_debugfs_init(adev);
 946         if (r) {
 947                 DRM_ERROR("Failed to init debugfs\n");
 948                 return r;
 949         }
 950         return 0;
 951 }
 952
 953 void amdgpu_ttm_fini(struct amdgpu_device *adev)
 954 {
 955         int r;
 956
 957         if (!adev->mman.initialized)
 958                 return;
 959         amdgpu_ttm_debugfs_fini(adev);
 960         if (adev->stollen_vga_memory) {
 961                 r = amdgpu_bo_reserve(adev->stollen_vga_memory, false);
 962                 if (r == 0) {
 963                         amdgpu_bo_unpin(adev->stollen_vga_memory);
 964                         amdgpu_bo_unreserve(adev->stollen_vga_memory);
 965                 }
 966                 amdgpu_bo_unref(&adev->stollen_vga_memory);
 967         }
 968         ttm_bo_clean_mm(&adev->mman.bdev, TTM_PL_VRAM);
 969         ttm_bo_clean_mm(&adev->mman.bdev, TTM_PL_TT);
 970         ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_GDS);
 971         ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_GWS);
 972         ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_OA);
 973         ttm_bo_device_release(&adev->mman.bdev);
 974         amdgpu_gart_fini(adev);
 975         amdgpu_ttm_global_fini(adev);
 976         adev->mman.initialized = false;
 977         DRM_INFO("amdgpu: ttm finalized\n");
 978 }
 979
 980 /* this should only be called at bootup or when userspace
 981  * isn't running */
 982 void amdgpu_ttm_set_active_vram_size(struct amdgpu_device *adev, u64 size)
 983 {
 984         struct ttm_mem_type_manager *man;
 985
 986         if (!adev->mman.initialized)
 987                 return;
 988
 989         man = &adev->mman.bdev.man[TTM_PL_VRAM];
 990         /* this just adjusts TTM size idea, which sets lpfn to the correct value */
 991         man->size = size >> PAGE_SHIFT;
 992 }
 993
 994 int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma)
 995 {
 996         struct drm_file *file_priv;
 997         struct amdgpu_device *adev;
 998
 999         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
1000                 return -EINVAL;
1001
1002         file_priv = filp->private_data;
1003         adev = file_priv->minor->dev->dev_private;
1004         if (adev == NULL)
1005                 return -EINVAL;
1006
1007         return ttm_bo_mmap(filp, vma, &adev->mman.bdev);
1008 }
1009
1010 int amdgpu_copy_buffer(struct amdgpu_ring *ring,
1011                        uint64_t src_offset,
1012                        uint64_t dst_offset,
1013                        uint32_t byte_count,
1014                        struct reservation_object *resv,
1015                        struct fence **fence)
1016 {
1017         struct amdgpu_device *adev = ring->adev;
1018         uint32_t max_bytes;
1019         unsigned num_loops, num_dw;
1020         struct amdgpu_ib *ib;
1021         unsigned i;
1022         int r;
1023
1024         max_bytes = adev->mman.buffer_funcs->copy_max_bytes;
1025         num_loops = DIV_ROUND_UP(byte_count, max_bytes);
1026         num_dw = num_loops * adev->mman.buffer_funcs->copy_num_dw;
1027
1028         /* for IB padding */
1029         while (num_dw & 0x7)
1030                 num_dw++;
1031
1032         ib = kzalloc(sizeof(struct amdgpu_ib), GFP_KERNEL);
1033         if (!ib)
1034                 return -ENOMEM;
1035
1036         r = amdgpu_ib_get(ring, NULL, num_dw * 4, ib);
1037         if (r) {
1038                 kfree(ib);
1039                 return r;
1040         }
1041
1042         ib->length_dw = 0;
1043
1044         if (resv) {
1045                 r = amdgpu_sync_resv(adev, &ib->sync, resv,
1046                                      AMDGPU_FENCE_OWNER_UNDEFINED);
1047                 if (r) {
1048                         DRM_ERROR("sync failed (%d).\n", r);
1049                         goto error_free;
1050                 }
1051         }
1052
1053         for (i = 0; i < num_loops; i++) {
1054                 uint32_t cur_size_in_bytes = min(byte_count, max_bytes);
1055
1056                 amdgpu_emit_copy_buffer(adev, ib, src_offset, dst_offset,
1057                                         cur_size_in_bytes);
1058
1059                 src_offset += cur_size_in_bytes;
1060                 dst_offset += cur_size_in_bytes;
1061                 byte_count -= cur_size_in_bytes;
1062         }
1063
1064         amdgpu_vm_pad_ib(adev, ib);
1065         WARN_ON(ib->length_dw > num_dw);
1066         r = amdgpu_sched_ib_submit_kernel_helper(adev, ring, ib, 1,
1067                                                  &amdgpu_vm_free_job,
1068                                                  AMDGPU_FENCE_OWNER_UNDEFINED,
1069                                                  fence);
1070         if (r)
1071                 goto error_free;
1072
1073         if (!amdgpu_enable_scheduler) {
1074                 amdgpu_ib_free(adev, ib);
1075                 kfree(ib);
1076         }
1077         return 0;
1078 error_free:
1079         amdgpu_ib_free(adev, ib);
1080         kfree(ib);
1081         return r;
1082 }
1083
1084 #if defined(CONFIG_DEBUG_FS)
1085
1086 static int amdgpu_mm_dump_table(struct seq_file *m, void *data)
1087 {
1088         struct drm_info_node *node = (struct drm_info_node *)m->private;
1089         unsigned ttm_pl = *(int *)node->info_ent->data;
1090         struct drm_device *dev = node->minor->dev;
1091         struct amdgpu_device *adev = dev->dev_private;
1092         struct drm_mm *mm = (struct drm_mm *)adev->mman.bdev.man[ttm_pl].priv;
1093         int ret;
1094         struct ttm_bo_global *glob = adev->mman.bdev.glob;
1095
1096         spin_lock(&glob->lru_lock);
1097         ret = drm_mm_dump_table(m, mm);
1098         spin_unlock(&glob->lru_lock);
1099         if (ttm_pl == TTM_PL_VRAM)
1100                 seq_printf(m, "man size:%llu pages, ram usage:%lluMB, vis usage:%lluMB\n",
1101                            adev->mman.bdev.man[ttm_pl].size,
1102                            (u64)atomic64_read(&adev->vram_usage) >> 20,
1103                            (u64)atomic64_read(&adev->vram_vis_usage) >> 20);
1104         return ret;
1105 }
1106
1107 static int ttm_pl_vram = TTM_PL_VRAM;
1108 static int ttm_pl_tt = TTM_PL_TT;
1109
1110 static struct drm_info_list amdgpu_ttm_debugfs_list[] = {
1111         {"amdgpu_vram_mm", amdgpu_mm_dump_table, 0, &ttm_pl_vram},
1112         {"amdgpu_gtt_mm", amdgpu_mm_dump_table, 0, &ttm_pl_tt},
1113         {"ttm_page_pool", ttm_page_alloc_debugfs, 0, NULL},
1114 #ifdef CONFIG_SWIOTLB
1115         {"ttm_dma_page_pool", ttm_dma_page_alloc_debugfs, 0, NULL}
1116 #endif
1117 };
1118
1119 static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf,
1120                                     size_t size, loff_t *pos)
1121 {
1122         struct amdgpu_device *adev = f->f_inode->i_private;
1123         ssize_t result = 0;
1124         int r;
1125
1126         if (size & 0x3 || *pos & 0x3)
1127                 return -EINVAL;
1128
1129         while (size) {
1130                 unsigned long flags;
1131                 uint32_t value;
1132
1133                 if (*pos >= adev->mc.mc_vram_size)
1134                         return result;
1135
1136                 spin_lock_irqsave(&adev->mmio_idx_lock, flags);
1137                 WREG32(mmMM_INDEX, ((uint32_t)*pos) | 0x80000000);
1138                 WREG32(mmMM_INDEX_HI, *pos >> 31);
1139                 value = RREG32(mmMM_DATA);
1140                 spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
1141
1142                 r = put_user(value, (uint32_t *)buf);
1143                 if (r)
1144                         return r;
1145
1146                 result += 4;
1147                 buf += 4;
1148                 *pos += 4;
1149                 size -= 4;
1150         }
1151
1152         return result;
1153 }
1154
1155 static const struct file_operations amdgpu_ttm_vram_fops = {
1156         .owner = THIS_MODULE,
1157         .read = amdgpu_ttm_vram_read,
1158         .llseek = default_llseek
1159 };
1160
1161 static ssize_t amdgpu_ttm_gtt_read(struct file *f, char __user *buf,
1162                                    size_t size, loff_t *pos)
1163 {
1164         struct amdgpu_device *adev = f->f_inode->i_private;
1165         ssize_t result = 0;
1166         int r;
1167
1168         while (size) {
1169                 loff_t p = *pos / PAGE_SIZE;
1170                 unsigned off = *pos & ~PAGE_MASK;
1171                 size_t cur_size = min_t(size_t, size, PAGE_SIZE - off);
1172                 struct page *page;
1173                 void *ptr;
1174
1175                 if (p >= adev->gart.num_cpu_pages)
1176                         return result;
1177
1178                 page = adev->gart.pages[p];
1179                 if (page) {
1180                         ptr = kmap(page);
1181                         ptr += off;
1182
1183                         r = copy_to_user(buf, ptr, cur_size);
1184                         kunmap(adev->gart.pages[p]);
1185                 } else
1186                         r = clear_user(buf, cur_size);
1187
1188                 if (r)
1189                         return -EFAULT;
1190
1191                 result += cur_size;
1192                 buf += cur_size;
1193                 *pos += cur_size;
1194                 size -= cur_size;
1195         }
1196
1197         return result;
1198 }
1199
1200 static const struct file_operations amdgpu_ttm_gtt_fops = {
1201         .owner = THIS_MODULE,
1202         .read = amdgpu_ttm_gtt_read,
1203         .llseek = default_llseek
1204 };
1205
1206 #endif
1207
1208 static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev)
1209 {
1210 #if defined(CONFIG_DEBUG_FS)
1211         unsigned count;
1212
1213         struct drm_minor *minor = adev->ddev->primary;
1214         struct dentry *ent, *root = minor->debugfs_root;
1215
1216         ent = debugfs_create_file("amdgpu_vram", S_IFREG | S_IRUGO, root,
1217                                   adev, &amdgpu_ttm_vram_fops);
1218         if (IS_ERR(ent))
1219                 return PTR_ERR(ent);
1220         i_size_write(ent->d_inode, adev->mc.mc_vram_size);
1221         adev->mman.vram = ent;
1222
1223         ent = debugfs_create_file("amdgpu_gtt", S_IFREG | S_IRUGO, root,
1224                                   adev, &amdgpu_ttm_gtt_fops);
1225         if (IS_ERR(ent))
1226                 return PTR_ERR(ent);
1227         i_size_write(ent->d_inode, adev->mc.gtt_size);
1228         adev->mman.gtt = ent;
1229
1230         count = ARRAY_SIZE(amdgpu_ttm_debugfs_list);
1231
1232 #ifdef CONFIG_SWIOTLB
1233         if (!swiotlb_nr_tbl())
1234                 --count;
1235 #endif
1236
1237         return amdgpu_debugfs_add_files(adev, amdgpu_ttm_debugfs_list, count);
1238 #else
1239
1240         return 0;
1241 #endif
1242 }
1243
1244 static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev)
1245 {
1246 #if defined(CONFIG_DEBUG_FS)
1247
1248         debugfs_remove(adev->mman.vram);
1249         adev->mman.vram = NULL;
1250
1251         debugfs_remove(adev->mman.gtt);
1252         adev->mman.gtt = NULL;
1253 #endif
1254 }