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 <[email protected]>
  29  *    Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
  30  *    Dave Airlie
  31  */
  32 #include <drm/ttm/ttm_bo_api.h>
  33 #include <drm/ttm/ttm_bo_driver.h>
  34 #include <drm/ttm/ttm_placement.h>
  35 #include <drm/ttm/ttm_module.h>
  36 #include <drm/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 <linux/iommu.h>
  46 #include "amdgpu.h"
  47 #include "amdgpu_object.h"
  48 #include "amdgpu_trace.h"
  49 #include "amdgpu_amdkfd.h"
  50 #include "bif/bif_4_1_d.h"
  51
  52 #define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
  53
  54 static int amdgpu_map_buffer(struct ttm_buffer_object *bo,
  55                              struct ttm_mem_reg *mem, unsigned num_pages,
  56                              uint64_t offset, unsigned window,
  57                              struct amdgpu_ring *ring,
  58                              uint64_t *addr);
  59
  60 static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev);
  61 static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev);
  62
  63 /*
  64  * Global memory.
  65  */
  66
  67 /**
  68  * amdgpu_ttm_mem_global_init - Initialize and acquire reference to
  69  * memory object
  70  *
  71  * @ref: Object for initialization.
  72  *
  73  * This is called by drm_global_item_ref() when an object is being
  74  * initialized.
  75  */
  76 static int amdgpu_ttm_mem_global_init(struct drm_global_reference *ref)
  77 {
  78         return ttm_mem_global_init(ref->object);
  79 }
  80
  81 /**
  82  * amdgpu_ttm_mem_global_release - Drop reference to a memory object
  83  *
  84  * @ref: Object being removed
  85  *
  86  * This is called by drm_global_item_unref() when an object is being
  87  * released.
  88  */
  89 static void amdgpu_ttm_mem_global_release(struct drm_global_reference *ref)
  90 {
  91         ttm_mem_global_release(ref->object);
  92 }
  93
  94 /**
  95  * amdgpu_ttm_global_init - Initialize global TTM memory reference
  96  *                                                      structures.
  97  *
  98  * @adev:       AMDGPU device for which the global structures need to be
  99  *                      registered.
 100  *
 101  * This is called as part of the AMDGPU ttm init from amdgpu_ttm_init()
 102  * during bring up.
 103  */
 104 static int amdgpu_ttm_global_init(struct amdgpu_device *adev)
 105 {
 106         struct drm_global_reference *global_ref;
 107         struct amdgpu_ring *ring;
 108         struct drm_sched_rq *rq;
 109         int r;
 110
 111         /* ensure reference is false in case init fails */
 112         adev->mman.mem_global_referenced = false;
 113
 114         global_ref = &adev->mman.mem_global_ref;
 115         global_ref->global_type = DRM_GLOBAL_TTM_MEM;
 116         global_ref->size = sizeof(struct ttm_mem_global);
 117         global_ref->init = &amdgpu_ttm_mem_global_init;
 118         global_ref->release = &amdgpu_ttm_mem_global_release;
 119         r = drm_global_item_ref(global_ref);
 120         if (r) {
 121                 DRM_ERROR("Failed setting up TTM memory accounting "
 122                           "subsystem.\n");
 123                 goto error_mem;
 124         }
 125
 126         adev->mman.bo_global_ref.mem_glob =
 127                 adev->mman.mem_global_ref.object;
 128         global_ref = &adev->mman.bo_global_ref.ref;
 129         global_ref->global_type = DRM_GLOBAL_TTM_BO;
 130         global_ref->size = sizeof(struct ttm_bo_global);
 131         global_ref->init = &ttm_bo_global_init;
 132         global_ref->release = &ttm_bo_global_release;
 133         r = drm_global_item_ref(global_ref);
 134         if (r) {
 135                 DRM_ERROR("Failed setting up TTM BO subsystem.\n");
 136                 goto error_bo;
 137         }
 138
 139         mutex_init(&adev->mman.gtt_window_lock);
 140
 141         ring = adev->mman.buffer_funcs_ring;
 142         rq = &ring->sched.sched_rq[DRM_SCHED_PRIORITY_KERNEL];
 143         r = drm_sched_entity_init(&ring->sched, &adev->mman.entity,
 144                                   rq, NULL);
 145         if (r) {
 146                 DRM_ERROR("Failed setting up TTM BO move run queue.\n");
 147                 goto error_entity;
 148         }
 149
 150         adev->mman.mem_global_referenced = true;
 151
 152         return 0;
 153
 154 error_entity:
 155         drm_global_item_unref(&adev->mman.bo_global_ref.ref);
 156 error_bo:
 157         drm_global_item_unref(&adev->mman.mem_global_ref);
 158 error_mem:
 159         return r;
 160 }
 161
 162 static void amdgpu_ttm_global_fini(struct amdgpu_device *adev)
 163 {
 164         if (adev->mman.mem_global_referenced) {
 165                 drm_sched_entity_fini(adev->mman.entity.sched,
 166                                       &adev->mman.entity);
 167                 mutex_destroy(&adev->mman.gtt_window_lock);
 168                 drm_global_item_unref(&adev->mman.bo_global_ref.ref);
 169                 drm_global_item_unref(&adev->mman.mem_global_ref);
 170                 adev->mman.mem_global_referenced = false;
 171         }
 172 }
 173
 174 static int amdgpu_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
 175 {
 176         return 0;
 177 }
 178
 179 /**
 180  * amdgpu_init_mem_type -       Initialize a memory manager for a specific
 181  *                                                      type of memory request.
 182  *
 183  * @bdev:       The TTM BO device object (contains a reference to
 184  *                      amdgpu_device)
 185  * @type:       The type of memory requested
 186  * @man:
 187  *
 188  * This is called by ttm_bo_init_mm() when a buffer object is being
 189  * initialized.
 190  */
 191 static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 192                                 struct ttm_mem_type_manager *man)
 193 {
 194         struct amdgpu_device *adev;
 195
 196         adev = amdgpu_ttm_adev(bdev);
 197
 198         switch (type) {
 199         case TTM_PL_SYSTEM:
 200                 /* System memory */
 201                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 202                 man->available_caching = TTM_PL_MASK_CACHING;
 203                 man->default_caching = TTM_PL_FLAG_CACHED;
 204                 break;
 205         case TTM_PL_TT:
 206                 /* GTT memory  */
 207                 man->func = &amdgpu_gtt_mgr_func;
 208                 man->gpu_offset = adev->gmc.gart_start;
 209                 man->available_caching = TTM_PL_MASK_CACHING;
 210                 man->default_caching = TTM_PL_FLAG_CACHED;
 211                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE | TTM_MEMTYPE_FLAG_CMA;
 212                 break;
 213         case TTM_PL_VRAM:
 214                 /* "On-card" video ram */
 215                 man->func = &amdgpu_vram_mgr_func;
 216                 man->gpu_offset = adev->gmc.vram_start;
 217                 man->flags = TTM_MEMTYPE_FLAG_FIXED |
 218                              TTM_MEMTYPE_FLAG_MAPPABLE;
 219                 man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
 220                 man->default_caching = TTM_PL_FLAG_WC;
 221                 break;
 222         case AMDGPU_PL_GDS:
 223         case AMDGPU_PL_GWS:
 224         case AMDGPU_PL_OA:
 225                 /* On-chip GDS memory*/
 226                 man->func = &ttm_bo_manager_func;
 227                 man->gpu_offset = 0;
 228                 man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_CMA;
 229                 man->available_caching = TTM_PL_FLAG_UNCACHED;
 230                 man->default_caching = TTM_PL_FLAG_UNCACHED;
 231                 break;
 232         default:
 233                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 234                 return -EINVAL;
 235         }
 236         return 0;
 237 }
 238
 239 /**
 240  * amdgpu_evict_flags - Compute placement flags
 241  *
 242  * @bo: The buffer object to evict
 243  * @placement: Possible destination(s) for evicted BO
 244  *
 245  * Fill in placement data when ttm_bo_evict() is called
 246  */
 247 static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
 248                                 struct ttm_placement *placement)
 249 {
 250         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
 251         struct amdgpu_bo *abo;
 252         static const struct ttm_place placements = {
 253                 .fpfn = 0,
 254                 .lpfn = 0,
 255                 .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM
 256         };
 257
 258         /* Don't handle scatter gather BOs */
 259         if (bo->type == ttm_bo_type_sg) {
 260                 placement->num_placement = 0;
 261                 placement->num_busy_placement = 0;
 262                 return;
 263         }
 264
 265         /* Object isn't an AMDGPU object so ignore */
 266         if (!amdgpu_ttm_bo_is_amdgpu_bo(bo)) {
 267                 placement->placement = &placements;
 268                 placement->busy_placement = &placements;
 269                 placement->num_placement = 1;
 270                 placement->num_busy_placement = 1;
 271                 return;
 272         }
 273
 274         abo = ttm_to_amdgpu_bo(bo);
 275         switch (bo->mem.mem_type) {
 276         case TTM_PL_VRAM:
 277                 if (!adev->mman.buffer_funcs_enabled) {
 278                         /* Move to system memory */
 279                         amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_CPU);
 280                 } else if (adev->gmc.visible_vram_size < adev->gmc.real_vram_size &&
 281                            !(abo->flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED) &&
 282                            amdgpu_bo_in_cpu_visible_vram(abo)) {
 283
 284                         /* Try evicting to the CPU inaccessible part of VRAM
 285                          * first, but only set GTT as busy placement, so this
 286                          * BO will be evicted to GTT rather than causing other
 287                          * BOs to be evicted from VRAM
 288                          */
 289                         amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_VRAM |
 290                                                          AMDGPU_GEM_DOMAIN_GTT);
 291                         abo->placements[0].fpfn = adev->gmc.visible_vram_size >> PAGE_SHIFT;
 292                         abo->placements[0].lpfn = 0;
 293                         abo->placement.busy_placement = &abo->placements[1];
 294                         abo->placement.num_busy_placement = 1;
 295                 } else {
 296                         /* Move to GTT memory */
 297                         amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_GTT);
 298                 }
 299                 break;
 300         case TTM_PL_TT:
 301         default:
 302                 amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_CPU);
 303         }
 304         *placement = abo->placement;
 305 }
 306
 307 /**
 308  * amdgpu_verify_access - Verify access for a mmap call
 309  *
 310  * @bo:         The buffer object to map
 311  * @filp:       The file pointer from the process performing the mmap
 312  *
 313  * This is called by ttm_bo_mmap() to verify whether a process
 314  * has the right to mmap a BO to their process space.
 315  */
 316 static int amdgpu_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 317 {
 318         struct amdgpu_bo *abo = ttm_to_amdgpu_bo(bo);
 319
 320         /*
 321          * Don't verify access for KFD BOs. They don't have a GEM
 322          * object associated with them.
 323          */
 324         if (abo->kfd_bo)
 325                 return 0;
 326
 327         if (amdgpu_ttm_tt_get_usermm(bo->ttm))
 328                 return -EPERM;
 329         return drm_vma_node_verify_access(&abo->gem_base.vma_node,
 330                                           filp->private_data);
 331 }
 332
 333 /**
 334  * amdgpu_move_null - Register memory for a buffer object
 335  *
 336  * @bo:                 The bo to assign the memory to
 337  * @new_mem:    The memory to be assigned.
 338  *
 339  * Assign the memory from new_mem to the memory of the buffer object
 340  * bo.
 341  */
 342 static void amdgpu_move_null(struct ttm_buffer_object *bo,
 343                              struct ttm_mem_reg *new_mem)
 344 {
 345         struct ttm_mem_reg *old_mem = &bo->mem;
 346
 347         BUG_ON(old_mem->mm_node != NULL);
 348         *old_mem = *new_mem;
 349         new_mem->mm_node = NULL;
 350 }
 351
 352 /**
 353  * amdgpu_mm_node_addr -        Compute the GPU relative offset of a GTT
 354  *                                                      buffer.
 355  */
 356 static uint64_t amdgpu_mm_node_addr(struct ttm_buffer_object *bo,
 357                                     struct drm_mm_node *mm_node,
 358                                     struct ttm_mem_reg *mem)
 359 {
 360         uint64_t addr = 0;
 361
 362         if (mem->mem_type != TTM_PL_TT || amdgpu_gtt_mgr_has_gart_addr(mem)) {
 363                 addr = mm_node->start << PAGE_SHIFT;
 364                 addr += bo->bdev->man[mem->mem_type].gpu_offset;
 365         }
 366         return addr;
 367 }
 368
 369 /**
 370  * amdgpu_find_mm_node -        Helper function finds the drm_mm_node
 371  *                                              corresponding to @offset. It also modifies
 372  *                                                      the offset to be within the drm_mm_node
 373  *                                                      returned
 374  */
 375 static struct drm_mm_node *amdgpu_find_mm_node(struct ttm_mem_reg *mem,
 376                                                unsigned long *offset)
 377 {
 378         struct drm_mm_node *mm_node = mem->mm_node;
 379
 380         while (*offset >= (mm_node->size << PAGE_SHIFT)) {
 381                 *offset -= (mm_node->size << PAGE_SHIFT);
 382                 ++mm_node;
 383         }
 384         return mm_node;
 385 }
 386
 387 /**
 388  * amdgpu_copy_ttm_mem_to_mem - Helper function for copy
 389  *
 390  * The function copies @size bytes from {src->mem + src->offset} to
 391  * {dst->mem + dst->offset}. src->bo and dst->bo could be same BO for a
 392  * move and different for a BO to BO copy.
 393  *
 394  * @f: Returns the last fence if multiple jobs are submitted.
 395  */
 396 int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev,
 397                                struct amdgpu_copy_mem *src,
 398                                struct amdgpu_copy_mem *dst,
 399                                uint64_t size,
 400                                struct reservation_object *resv,
 401                                struct dma_fence **f)
 402 {
 403         struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
 404         struct drm_mm_node *src_mm, *dst_mm;
 405         uint64_t src_node_start, dst_node_start, src_node_size,
 406                  dst_node_size, src_page_offset, dst_page_offset;
 407         struct dma_fence *fence = NULL;
 408         int r = 0;
 409         const uint64_t GTT_MAX_BYTES = (AMDGPU_GTT_MAX_TRANSFER_SIZE *
 410                                         AMDGPU_GPU_PAGE_SIZE);
 411
 412         if (!adev->mman.buffer_funcs_enabled) {
 413                 DRM_ERROR("Trying to move memory with ring turned off.\n");
 414                 return -EINVAL;
 415         }
 416
 417         src_mm = amdgpu_find_mm_node(src->mem, &src->offset);
 418         src_node_start = amdgpu_mm_node_addr(src->bo, src_mm, src->mem) +
 419                                              src->offset;
 420         src_node_size = (src_mm->size << PAGE_SHIFT) - src->offset;
 421         src_page_offset = src_node_start & (PAGE_SIZE - 1);
 422
 423         dst_mm = amdgpu_find_mm_node(dst->mem, &dst->offset);
 424         dst_node_start = amdgpu_mm_node_addr(dst->bo, dst_mm, dst->mem) +
 425                                              dst->offset;
 426         dst_node_size = (dst_mm->size << PAGE_SHIFT) - dst->offset;
 427         dst_page_offset = dst_node_start & (PAGE_SIZE - 1);
 428
 429         mutex_lock(&adev->mman.gtt_window_lock);
 430
 431         while (size) {
 432                 unsigned long cur_size;
 433                 uint64_t from = src_node_start, to = dst_node_start;
 434                 struct dma_fence *next;
 435
 436                 /* Copy size cannot exceed GTT_MAX_BYTES. So if src or dst
 437                  * begins at an offset, then adjust the size accordingly
 438                  */
 439                 cur_size = min3(min(src_node_size, dst_node_size), size,
 440                                 GTT_MAX_BYTES);
 441                 if (cur_size + src_page_offset > GTT_MAX_BYTES ||
 442                     cur_size + dst_page_offset > GTT_MAX_BYTES)
 443                         cur_size -= max(src_page_offset, dst_page_offset);
 444
 445                 /* Map only what needs to be accessed. Map src to window 0 and
 446                  * dst to window 1
 447                  */
 448                 if (src->mem->mem_type == TTM_PL_TT &&
 449                     !amdgpu_gtt_mgr_has_gart_addr(src->mem)) {
 450                         r = amdgpu_map_buffer(src->bo, src->mem,
 451                                         PFN_UP(cur_size + src_page_offset),
 452                                         src_node_start, 0, ring,
 453                                         &from);
 454                         if (r)
 455                                 goto error;
 456                         /* Adjust the offset because amdgpu_map_buffer returns
 457                          * start of mapped page
 458                          */
 459                         from += src_page_offset;
 460                 }
 461
 462                 if (dst->mem->mem_type == TTM_PL_TT &&
 463                     !amdgpu_gtt_mgr_has_gart_addr(dst->mem)) {
 464                         r = amdgpu_map_buffer(dst->bo, dst->mem,
 465                                         PFN_UP(cur_size + dst_page_offset),
 466                                         dst_node_start, 1, ring,
 467                                         &to);
 468                         if (r)
 469                                 goto error;
 470                         to += dst_page_offset;
 471                 }
 472
 473                 r = amdgpu_copy_buffer(ring, from, to, cur_size,
 474                                        resv, &next, false, true);
 475                 if (r)
 476                         goto error;
 477
 478                 dma_fence_put(fence);
 479                 fence = next;
 480
 481                 size -= cur_size;
 482                 if (!size)
 483                         break;
 484
 485                 src_node_size -= cur_size;
 486                 if (!src_node_size) {
 487                         src_node_start = amdgpu_mm_node_addr(src->bo, ++src_mm,
 488                                                              src->mem);
 489                         src_node_size = (src_mm->size << PAGE_SHIFT);
 490                 } else {
 491                         src_node_start += cur_size;
 492                         src_page_offset = src_node_start & (PAGE_SIZE - 1);
 493                 }
 494                 dst_node_size -= cur_size;
 495                 if (!dst_node_size) {
 496                         dst_node_start = amdgpu_mm_node_addr(dst->bo, ++dst_mm,
 497                                                              dst->mem);
 498                         dst_node_size = (dst_mm->size << PAGE_SHIFT);
 499                 } else {
 500                         dst_node_start += cur_size;
 501                         dst_page_offset = dst_node_start & (PAGE_SIZE - 1);
 502                 }
 503         }
 504 error:
 505         mutex_unlock(&adev->mman.gtt_window_lock);
 506         if (f)
 507                 *f = dma_fence_get(fence);
 508         dma_fence_put(fence);
 509         return r;
 510 }
 511
 512 /**
 513  * amdgpu_move_blit - Copy an entire buffer to another buffer
 514  *
 515  * This is a helper called by amdgpu_bo_move() and
 516  * amdgpu_move_vram_ram() to help move buffers to and from VRAM.
 517  */
 518 static int amdgpu_move_blit(struct ttm_buffer_object *bo,
 519                             bool evict, bool no_wait_gpu,
 520                             struct ttm_mem_reg *new_mem,
 521                             struct ttm_mem_reg *old_mem)
 522 {
 523         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
 524         struct amdgpu_copy_mem src, dst;
 525         struct dma_fence *fence = NULL;
 526         int r;
 527
 528         src.bo = bo;
 529         dst.bo = bo;
 530         src.mem = old_mem;
 531         dst.mem = new_mem;
 532         src.offset = 0;
 533         dst.offset = 0;
 534
 535         r = amdgpu_ttm_copy_mem_to_mem(adev, &src, &dst,
 536                                        new_mem->num_pages << PAGE_SHIFT,
 537                                        bo->resv, &fence);
 538         if (r)
 539                 goto error;
 540
 541         r = ttm_bo_pipeline_move(bo, fence, evict, new_mem);
 542         dma_fence_put(fence);
 543         return r;
 544
 545 error:
 546         if (fence)
 547                 dma_fence_wait(fence, false);
 548         dma_fence_put(fence);
 549         return r;
 550 }
 551
 552 /**
 553  * amdgpu_move_vram_ram - Copy VRAM buffer to RAM buffer
 554  *
 555  * Called by amdgpu_bo_move().
 556  */
 557 static int amdgpu_move_vram_ram(struct ttm_buffer_object *bo, bool evict,
 558                                 struct ttm_operation_ctx *ctx,
 559                                 struct ttm_mem_reg *new_mem)
 560 {
 561         struct amdgpu_device *adev;
 562         struct ttm_mem_reg *old_mem = &bo->mem;
 563         struct ttm_mem_reg tmp_mem;
 564         struct ttm_place placements;
 565         struct ttm_placement placement;
 566         int r;
 567
 568         adev = amdgpu_ttm_adev(bo->bdev);
 569
 570         /* create space/pages for new_mem in GTT space */
 571         tmp_mem = *new_mem;
 572         tmp_mem.mm_node = NULL;
 573         placement.num_placement = 1;
 574         placement.placement = &placements;
 575         placement.num_busy_placement = 1;
 576         placement.busy_placement = &placements;
 577         placements.fpfn = 0;
 578         placements.lpfn = 0;
 579         placements.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT;
 580         r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx);
 581         if (unlikely(r)) {
 582                 return r;
 583         }
 584
 585         /* set caching flags */
 586         r = ttm_tt_set_placement_caching(bo->ttm, tmp_mem.placement);
 587         if (unlikely(r)) {
 588                 goto out_cleanup;
 589         }
 590
 591         /* Bind the memory to the GTT space */
 592         r = ttm_tt_bind(bo->ttm, &tmp_mem, ctx);
 593         if (unlikely(r)) {
 594                 goto out_cleanup;
 595         }
 596
 597         /* blit VRAM to GTT */
 598         r = amdgpu_move_blit(bo, true, ctx->no_wait_gpu, &tmp_mem, old_mem);
 599         if (unlikely(r)) {
 600                 goto out_cleanup;
 601         }
 602
 603         /* move BO (in tmp_mem) to new_mem */
 604         r = ttm_bo_move_ttm(bo, ctx, new_mem);
 605 out_cleanup:
 606         ttm_bo_mem_put(bo, &tmp_mem);
 607         return r;
 608 }
 609
 610 /**
 611  * amdgpu_move_ram_vram - Copy buffer from RAM to VRAM
 612  *
 613  * Called by amdgpu_bo_move().
 614  */
 615 static int amdgpu_move_ram_vram(struct ttm_buffer_object *bo, bool evict,
 616                                 struct ttm_operation_ctx *ctx,
 617                                 struct ttm_mem_reg *new_mem)
 618 {
 619         struct amdgpu_device *adev;
 620         struct ttm_mem_reg *old_mem = &bo->mem;
 621         struct ttm_mem_reg tmp_mem;
 622         struct ttm_placement placement;
 623         struct ttm_place placements;
 624         int r;
 625
 626         adev = amdgpu_ttm_adev(bo->bdev);
 627
 628         /* make space in GTT for old_mem buffer */
 629         tmp_mem = *new_mem;
 630         tmp_mem.mm_node = NULL;
 631         placement.num_placement = 1;
 632         placement.placement = &placements;
 633         placement.num_busy_placement = 1;
 634         placement.busy_placement = &placements;
 635         placements.fpfn = 0;
 636         placements.lpfn = 0;
 637         placements.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT;
 638         r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx);
 639         if (unlikely(r)) {
 640                 return r;
 641         }
 642
 643         /* move/bind old memory to GTT space */
 644         r = ttm_bo_move_ttm(bo, ctx, &tmp_mem);
 645         if (unlikely(r)) {
 646                 goto out_cleanup;
 647         }
 648
 649         /* copy to VRAM */
 650         r = amdgpu_move_blit(bo, true, ctx->no_wait_gpu, new_mem, old_mem);
 651         if (unlikely(r)) {
 652                 goto out_cleanup;
 653         }
 654 out_cleanup:
 655         ttm_bo_mem_put(bo, &tmp_mem);
 656         return r;
 657 }
 658
 659 /**
 660  * amdgpu_bo_move - Move a buffer object to a new memory location
 661  *
 662  * Called by ttm_bo_handle_move_mem()
 663  */
 664 static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
 665                           struct ttm_operation_ctx *ctx,
 666                           struct ttm_mem_reg *new_mem)
 667 {
 668         struct amdgpu_device *adev;
 669         struct amdgpu_bo *abo;
 670         struct ttm_mem_reg *old_mem = &bo->mem;
 671         int r;
 672
 673         /* Can't move a pinned BO */
 674         abo = ttm_to_amdgpu_bo(bo);
 675         if (WARN_ON_ONCE(abo->pin_count > 0))
 676                 return -EINVAL;
 677
 678         adev = amdgpu_ttm_adev(bo->bdev);
 679
 680         if (old_mem->mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
 681                 amdgpu_move_null(bo, new_mem);
 682                 return 0;
 683         }
 684         if ((old_mem->mem_type == TTM_PL_TT &&
 685              new_mem->mem_type == TTM_PL_SYSTEM) ||
 686             (old_mem->mem_type == TTM_PL_SYSTEM &&
 687              new_mem->mem_type == TTM_PL_TT)) {
 688                 /* bind is enough */
 689                 amdgpu_move_null(bo, new_mem);
 690                 return 0;
 691         }
 692
 693         if (!adev->mman.buffer_funcs_enabled)
 694                 goto memcpy;
 695
 696         if (old_mem->mem_type == TTM_PL_VRAM &&
 697             new_mem->mem_type == TTM_PL_SYSTEM) {
 698                 r = amdgpu_move_vram_ram(bo, evict, ctx, new_mem);
 699         } else if (old_mem->mem_type == TTM_PL_SYSTEM &&
 700                    new_mem->mem_type == TTM_PL_VRAM) {
 701                 r = amdgpu_move_ram_vram(bo, evict, ctx, new_mem);
 702         } else {
 703                 r = amdgpu_move_blit(bo, evict, ctx->no_wait_gpu,
 704                                      new_mem, old_mem);
 705         }
 706
 707         if (r) {
 708 memcpy:
 709                 r = ttm_bo_move_memcpy(bo, ctx, new_mem);
 710                 if (r) {
 711                         return r;
 712                 }
 713         }
 714
 715         if (bo->type == ttm_bo_type_device &&
 716             new_mem->mem_type == TTM_PL_VRAM &&
 717             old_mem->mem_type != TTM_PL_VRAM) {
 718                 /* amdgpu_bo_fault_reserve_notify will re-set this if the CPU
 719                  * accesses the BO after it's moved.
 720                  */
 721                 abo->flags &= ~AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
 722         }
 723
 724         /* update statistics */
 725         atomic64_add((u64)bo->num_pages << PAGE_SHIFT, &adev->num_bytes_moved);
 726         return 0;
 727 }
 728
 729 /**
 730  * amdgpu_ttm_io_mem_reserve - Reserve a block of memory during a fault
 731  *
 732  * Called by ttm_mem_io_reserve() ultimately via ttm_bo_vm_fault()
 733  */
 734 static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 735 {
 736         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 737         struct amdgpu_device *adev = amdgpu_ttm_adev(bdev);
 738         struct drm_mm_node *mm_node = mem->mm_node;
 739
 740         mem->bus.addr = NULL;
 741         mem->bus.offset = 0;
 742         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 743         mem->bus.base = 0;
 744         mem->bus.is_iomem = false;
 745         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 746                 return -EINVAL;
 747         switch (mem->mem_type) {
 748         case TTM_PL_SYSTEM:
 749                 /* system memory */
 750                 return 0;
 751         case TTM_PL_TT:
 752                 break;
 753         case TTM_PL_VRAM:
 754                 mem->bus.offset = mem->start << PAGE_SHIFT;
 755                 /* check if it's visible */
 756                 if ((mem->bus.offset + mem->bus.size) > adev->gmc.visible_vram_size)
 757                         return -EINVAL;
 758                 /* Only physically contiguous buffers apply. In a contiguous
 759                  * buffer, size of the first mm_node would match the number of
 760                  * pages in ttm_mem_reg.
 761                  */
 762                 if (adev->mman.aper_base_kaddr &&
 763                     (mm_node->size == mem->num_pages))
 764                         mem->bus.addr = (u8 *)adev->mman.aper_base_kaddr +
 765                                         mem->bus.offset;
 766
 767                 mem->bus.base = adev->gmc.aper_base;
 768                 mem->bus.is_iomem = true;
 769                 break;
 770         default:
 771                 return -EINVAL;
 772         }
 773         return 0;
 774 }
 775
 776 static void amdgpu_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 777 {
 778 }
 779
 780 static unsigned long amdgpu_ttm_io_mem_pfn(struct ttm_buffer_object *bo,
 781                                            unsigned long page_offset)
 782 {
 783         struct drm_mm_node *mm;
 784         unsigned long offset = (page_offset << PAGE_SHIFT);
 785
 786         mm = amdgpu_find_mm_node(&bo->mem, &offset);
 787         return (bo->mem.bus.base >> PAGE_SHIFT) + mm->start +
 788                 (offset >> PAGE_SHIFT);
 789 }
 790
 791 /*
 792  * TTM backend functions.
 793  */
 794 struct amdgpu_ttm_gup_task_list {
 795         struct list_head        list;
 796         struct task_struct      *task;
 797 };
 798
 799 struct amdgpu_ttm_tt {
 800         struct ttm_dma_tt       ttm;
 801         u64                     offset;
 802         uint64_t                userptr;
 803         struct task_struct      *usertask;
 804         uint32_t                userflags;
 805         spinlock_t              guptasklock;
 806         struct list_head        guptasks;
 807         atomic_t                mmu_invalidations;
 808         uint32_t                last_set_pages;
 809 };
 810
 811 /**
 812  * amdgpu_ttm_tt_get_user_pages -       Pin pages of memory pointed to
 813  *                                                                      by a USERPTR pointer to memory
 814  *
 815  * Called by amdgpu_gem_userptr_ioctl() and amdgpu_cs_parser_bos().
 816  * This provides a wrapper around the get_user_pages() call to provide
 817  * device accessible pages that back user memory.
 818  */
 819 int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
 820 {
 821         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 822         struct mm_struct *mm = gtt->usertask->mm;
 823         unsigned int flags = 0;
 824         unsigned pinned = 0;
 825         int r;
 826
 827         if (!mm) /* Happens during process shutdown */
 828                 return -ESRCH;
 829
 830         if (!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY))
 831                 flags |= FOLL_WRITE;
 832
 833         down_read(&mm->mmap_sem);
 834
 835         if (gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) {
 836                 /* check that we only use anonymous memory
 837                    to prevent problems with writeback */
 838                 unsigned long end = gtt->userptr + ttm->num_pages * PAGE_SIZE;
 839                 struct vm_area_struct *vma;
 840
 841                 vma = find_vma(mm, gtt->userptr);
 842                 if (!vma || vma->vm_file || vma->vm_end < end) {
 843                         up_read(&mm->mmap_sem);
 844                         return -EPERM;
 845                 }
 846         }
 847
 848         /* loop enough times using contiguous pages of memory */
 849         do {
 850                 unsigned num_pages = ttm->num_pages - pinned;
 851                 uint64_t userptr = gtt->userptr + pinned * PAGE_SIZE;
 852                 struct page **p = pages + pinned;
 853                 struct amdgpu_ttm_gup_task_list guptask;
 854
 855                 guptask.task = current;
 856                 spin_lock(&gtt->guptasklock);
 857                 list_add(&guptask.list, &gtt->guptasks);
 858                 spin_unlock(&gtt->guptasklock);
 859
 860                 if (mm == current->mm)
 861                         r = get_user_pages(userptr, num_pages, flags, p, NULL);
 862                 else
 863                         r = get_user_pages_remote(gtt->usertask,
 864                                         mm, userptr, num_pages,
 865                                         flags, p, NULL, NULL);
 866
 867                 spin_lock(&gtt->guptasklock);
 868                 list_del(&guptask.list);
 869                 spin_unlock(&gtt->guptasklock);
 870
 871                 if (r < 0)
 872                         goto release_pages;
 873
 874                 pinned += r;
 875
 876         } while (pinned < ttm->num_pages);
 877
 878         up_read(&mm->mmap_sem);
 879         return 0;
 880
 881 release_pages:
 882         release_pages(pages, pinned);
 883         up_read(&mm->mmap_sem);
 884         return r;
 885 }
 886
 887 /**
 888  * amdgpu_ttm_tt_set_user_pages -       Copy pages in, putting old pages
 889  *                                                                      as necessary.
 890  *
 891  * Called by amdgpu_cs_list_validate().  This creates the page list
 892  * that backs user memory and will ultimately be mapped into the device
 893  * address space.
 894  */
 895 void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct page **pages)
 896 {
 897         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 898         unsigned i;
 899
 900         gtt->last_set_pages = atomic_read(&gtt->mmu_invalidations);
 901         for (i = 0; i < ttm->num_pages; ++i) {
 902                 if (ttm->pages[i])
 903                         put_page(ttm->pages[i]);
 904
 905                 ttm->pages[i] = pages ? pages[i] : NULL;
 906         }
 907 }
 908
 909 /**
 910  * amdgpu_ttm_tt_mark_user_page - Mark pages as dirty
 911  *
 912  * Called while unpinning userptr pages
 913  */
 914 void amdgpu_ttm_tt_mark_user_pages(struct ttm_tt *ttm)
 915 {
 916         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 917         unsigned i;
 918
 919         for (i = 0; i < ttm->num_pages; ++i) {
 920                 struct page *page = ttm->pages[i];
 921
 922                 if (!page)
 923                         continue;
 924
 925                 if (!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY))
 926                         set_page_dirty(page);
 927
 928                 mark_page_accessed(page);
 929         }
 930 }
 931
 932 /**
 933  * amdgpu_ttm_tt_pin_userptr -  prepare the sg table with the
 934  *                                                              user pages
 935  *
 936  * Called by amdgpu_ttm_backend_bind()
 937  **/
 938 static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt *ttm)
 939 {
 940         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
 941         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 942         unsigned nents;
 943         int r;
 944
 945         int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
 946         enum dma_data_direction direction = write ?
 947                 DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 948
 949         /* Allocate an SG array and squash pages into it */
 950         r = sg_alloc_table_from_pages(ttm->sg, ttm->pages, ttm->num_pages, 0,
 951                                       ttm->num_pages << PAGE_SHIFT,
 952                                       GFP_KERNEL);
 953         if (r)
 954                 goto release_sg;
 955
 956         /* Map SG to device */
 957         r = -ENOMEM;
 958         nents = dma_map_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
 959         if (nents != ttm->sg->nents)
 960                 goto release_sg;
 961
 962         /* convert SG to linear array of pages and dma addresses */
 963         drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
 964                                          gtt->ttm.dma_address, ttm->num_pages);
 965
 966         return 0;
 967
 968 release_sg:
 969         kfree(ttm->sg);
 970         return r;
 971 }
 972
 973 /**
 974  * amdgpu_ttm_tt_unpin_userptr - Unpin and unmap userptr pages
 975  */
 976 static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
 977 {
 978         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
 979         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 980
 981         int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
 982         enum dma_data_direction direction = write ?
 983                 DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 984
 985         /* double check that we don't free the table twice */
 986         if (!ttm->sg->sgl)
 987                 return;
 988
 989         /* unmap the pages mapped to the device */
 990         dma_unmap_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
 991
 992         /* mark the pages as dirty */
 993         amdgpu_ttm_tt_mark_user_pages(ttm);
 994
 995         sg_free_table(ttm->sg);
 996 }
 997
 998 int amdgpu_ttm_gart_bind(struct amdgpu_device *adev,
 999                                 struct ttm_buffer_object *tbo,
1000                                 uint64_t flags)
1001 {
1002         struct amdgpu_bo *abo = ttm_to_amdgpu_bo(tbo);
1003         struct ttm_tt *ttm = tbo->ttm;
1004         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1005         int r;
1006
1007         if (abo->flags & AMDGPU_GEM_CREATE_MQD_GFX9) {
1008                 uint64_t page_idx = 1;
1009
1010                 r = amdgpu_gart_bind(adev, gtt->offset, page_idx,
1011                                 ttm->pages, gtt->ttm.dma_address, flags);
1012                 if (r)
1013                         goto gart_bind_fail;
1014
1015                 /* Patch mtype of the second part BO */
1016                 flags &=  ~AMDGPU_PTE_MTYPE_MASK;
1017                 flags |= AMDGPU_PTE_MTYPE(AMDGPU_MTYPE_NC);
1018
1019                 r = amdgpu_gart_bind(adev,
1020                                 gtt->offset + (page_idx << PAGE_SHIFT),
1021                                 ttm->num_pages - page_idx,
1022                                 &ttm->pages[page_idx],
1023                                 &(gtt->ttm.dma_address[page_idx]), flags);
1024         } else {
1025                 r = amdgpu_gart_bind(adev, gtt->offset, ttm->num_pages,
1026                                      ttm->pages, gtt->ttm.dma_address, flags);
1027         }
1028
1029 gart_bind_fail:
1030         if (r)
1031                 DRM_ERROR("failed to bind %lu pages at 0x%08llX\n",
1032                           ttm->num_pages, gtt->offset);
1033
1034         return r;
1035 }
1036
1037 /**
1038  * amdgpu_ttm_backend_bind - Bind GTT memory
1039  *
1040  * Called by ttm_tt_bind() on behalf of ttm_bo_handle_move_mem().
1041  * This handles binding GTT memory to the device address space.
1042  */
1043 static int amdgpu_ttm_backend_bind(struct ttm_tt *ttm,
1044                                    struct ttm_mem_reg *bo_mem)
1045 {
1046         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
1047         struct amdgpu_ttm_tt *gtt = (void*)ttm;
1048         uint64_t flags;
1049         int r = 0;
1050
1051         if (gtt->userptr) {
1052                 r = amdgpu_ttm_tt_pin_userptr(ttm);
1053                 if (r) {
1054                         DRM_ERROR("failed to pin userptr\n");
1055                         return r;
1056                 }
1057         }
1058         if (!ttm->num_pages) {
1059                 WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
1060                      ttm->num_pages, bo_mem, ttm);
1061         }
1062
1063         if (bo_mem->mem_type == AMDGPU_PL_GDS ||
1064             bo_mem->mem_type == AMDGPU_PL_GWS ||
1065             bo_mem->mem_type == AMDGPU_PL_OA)
1066                 return -EINVAL;
1067
1068         if (!amdgpu_gtt_mgr_has_gart_addr(bo_mem)) {
1069                 gtt->offset = AMDGPU_BO_INVALID_OFFSET;
1070                 return 0;
1071         }
1072
1073         /* compute PTE flags relevant to this BO memory */
1074         flags = amdgpu_ttm_tt_pte_flags(adev, ttm, bo_mem);
1075
1076         /* bind pages into GART page tables */
1077         gtt->offset = (u64)bo_mem->start << PAGE_SHIFT;
1078         r = amdgpu_gart_bind(adev, gtt->offset, ttm->num_pages,
1079                 ttm->pages, gtt->ttm.dma_address, flags);
1080
1081         if (r)
1082                 DRM_ERROR("failed to bind %lu pages at 0x%08llX\n",
1083                           ttm->num_pages, gtt->offset);
1084         return r;
1085 }
1086
1087 /**
1088  * amdgpu_ttm_alloc_gart - Allocate GART memory for buffer object
1089  */
1090 int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
1091 {
1092         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
1093         struct ttm_operation_ctx ctx = { false, false };
1094         struct amdgpu_ttm_tt *gtt = (void*)bo->ttm;
1095         struct ttm_mem_reg tmp;
1096         struct ttm_placement placement;
1097         struct ttm_place placements;
1098         uint64_t flags;
1099         int r;
1100
1101         if (bo->mem.mem_type != TTM_PL_TT ||
1102             amdgpu_gtt_mgr_has_gart_addr(&bo->mem))
1103                 return 0;
1104
1105         /* allocate GTT space */
1106         tmp = bo->mem;
1107         tmp.mm_node = NULL;
1108         placement.num_placement = 1;
1109         placement.placement = &placements;
1110         placement.num_busy_placement = 1;
1111         placement.busy_placement = &placements;
1112         placements.fpfn = 0;
1113         placements.lpfn = adev->gmc.gart_size >> PAGE_SHIFT;
1114         placements.flags = (bo->mem.placement & ~TTM_PL_MASK_MEM) |
1115                 TTM_PL_FLAG_TT;
1116
1117         r = ttm_bo_mem_space(bo, &placement, &tmp, &ctx);
1118         if (unlikely(r))
1119                 return r;
1120
1121         /* compute PTE flags for this buffer object */
1122         flags = amdgpu_ttm_tt_pte_flags(adev, bo->ttm, &tmp);
1123
1124         /* Bind pages */
1125         gtt->offset = (u64)tmp.start << PAGE_SHIFT;
1126         r = amdgpu_ttm_gart_bind(adev, bo, flags);
1127         if (unlikely(r)) {
1128                 ttm_bo_mem_put(bo, &tmp);
1129                 return r;
1130         }
1131
1132         ttm_bo_mem_put(bo, &bo->mem);
1133         bo->mem = tmp;
1134         bo->offset = (bo->mem.start << PAGE_SHIFT) +
1135                 bo->bdev->man[bo->mem.mem_type].gpu_offset;
1136
1137         return 0;
1138 }
1139
1140 /**
1141  * amdgpu_ttm_recover_gart - Rebind GTT pages
1142  *
1143  * Called by amdgpu_gtt_mgr_recover() from amdgpu_device_reset() to
1144  * rebind GTT pages during a GPU reset.
1145  */
1146 int amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo)
1147 {
1148         struct amdgpu_device *adev = amdgpu_ttm_adev(tbo->bdev);
1149         uint64_t flags;
1150         int r;
1151
1152         if (!tbo->ttm)
1153                 return 0;
1154
1155         flags = amdgpu_ttm_tt_pte_flags(adev, tbo->ttm, &tbo->mem);
1156         r = amdgpu_ttm_gart_bind(adev, tbo, flags);
1157
1158         return r;
1159 }
1160
1161 /**
1162  * amdgpu_ttm_backend_unbind - Unbind GTT mapped pages
1163  *
1164  * Called by ttm_tt_unbind() on behalf of ttm_bo_move_ttm() and
1165  * ttm_tt_destroy().
1166  */
1167 static int amdgpu_ttm_backend_unbind(struct ttm_tt *ttm)
1168 {
1169         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
1170         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1171         int r;
1172
1173         /* if the pages have userptr pinning then clear that first */
1174         if (gtt->userptr)
1175                 amdgpu_ttm_tt_unpin_userptr(ttm);
1176
1177         if (gtt->offset == AMDGPU_BO_INVALID_OFFSET)
1178                 return 0;
1179
1180         /* unbind shouldn't be done for GDS/GWS/OA in ttm_bo_clean_mm */
1181         r = amdgpu_gart_unbind(adev, gtt->offset, ttm->num_pages);
1182         if (r)
1183                 DRM_ERROR("failed to unbind %lu pages at 0x%08llX\n",
1184                           gtt->ttm.ttm.num_pages, gtt->offset);
1185         return r;
1186 }
1187
1188 static void amdgpu_ttm_backend_destroy(struct ttm_tt *ttm)
1189 {
1190         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1191
1192         if (gtt->usertask)
1193                 put_task_struct(gtt->usertask);
1194
1195         ttm_dma_tt_fini(&gtt->ttm);
1196         kfree(gtt);
1197 }
1198
1199 static struct ttm_backend_func amdgpu_backend_func = {
1200         .bind = &amdgpu_ttm_backend_bind,
1201         .unbind = &amdgpu_ttm_backend_unbind,
1202         .destroy = &amdgpu_ttm_backend_destroy,
1203 };
1204
1205 /**
1206  * amdgpu_ttm_tt_create - Create a ttm_tt object for a given BO
1207  *
1208  * @bo: The buffer object to create a GTT ttm_tt object around
1209  *
1210  * Called by ttm_tt_create().
1211  */
1212 static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_buffer_object *bo,
1213                                            uint32_t page_flags)
1214 {
1215         struct amdgpu_device *adev;
1216         struct amdgpu_ttm_tt *gtt;
1217
1218         adev = amdgpu_ttm_adev(bo->bdev);
1219
1220         gtt = kzalloc(sizeof(struct amdgpu_ttm_tt), GFP_KERNEL);
1221         if (gtt == NULL) {
1222                 return NULL;
1223         }
1224         gtt->ttm.ttm.func = &amdgpu_backend_func;
1225
1226         /* allocate space for the uninitialized page entries */
1227         if (ttm_sg_tt_init(&gtt->ttm, bo, page_flags)) {
1228                 kfree(gtt);
1229                 return NULL;
1230         }
1231         return &gtt->ttm.ttm;
1232 }
1233
1234 /**
1235  * amdgpu_ttm_tt_populate - Map GTT pages visible to the device
1236  *
1237  * Map the pages of a ttm_tt object to an address space visible
1238  * to the underlying device.
1239  */
1240 static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm,
1241                         struct ttm_operation_ctx *ctx)
1242 {
1243         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
1244         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1245         bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
1246
1247         /* user pages are bound by amdgpu_ttm_tt_pin_userptr() */
1248         if (gtt && gtt->userptr) {
1249                 ttm->sg = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
1250                 if (!ttm->sg)
1251                         return -ENOMEM;
1252
1253                 ttm->page_flags |= TTM_PAGE_FLAG_SG;
1254                 ttm->state = tt_unbound;
1255                 return 0;
1256         }
1257
1258         if (slave && ttm->sg) {
1259                 drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
1260                                                  gtt->ttm.dma_address,
1261                                                  ttm->num_pages);
1262                 ttm->state = tt_unbound;
1263                 return 0;
1264         }
1265
1266 #ifdef CONFIG_SWIOTLB
1267         if (adev->need_swiotlb && swiotlb_nr_tbl()) {
1268                 return ttm_dma_populate(&gtt->ttm, adev->dev, ctx);
1269         }
1270 #endif
1271
1272         /* fall back to generic helper to populate the page array
1273          * and map them to the device */
1274         return ttm_populate_and_map_pages(adev->dev, &gtt->ttm, ctx);
1275 }
1276
1277 /**
1278  * amdgpu_ttm_tt_unpopulate - unmap GTT pages and unpopulate page arrays
1279  *
1280  * Unmaps pages of a ttm_tt object from the device address space and
1281  * unpopulates the page array backing it.
1282  */
1283 static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
1284 {
1285         struct amdgpu_device *adev;
1286         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1287         bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
1288
1289         if (gtt && gtt->userptr) {
1290                 amdgpu_ttm_tt_set_user_pages(ttm, NULL);
1291                 kfree(ttm->sg);
1292                 ttm->page_flags &= ~TTM_PAGE_FLAG_SG;
1293                 return;
1294         }
1295
1296         if (slave)
1297                 return;
1298
1299         adev = amdgpu_ttm_adev(ttm->bdev);
1300
1301 #ifdef CONFIG_SWIOTLB
1302         if (adev->need_swiotlb && swiotlb_nr_tbl()) {
1303                 ttm_dma_unpopulate(&gtt->ttm, adev->dev);
1304                 return;
1305         }
1306 #endif
1307
1308         /* fall back to generic helper to unmap and unpopulate array */
1309         ttm_unmap_and_unpopulate_pages(adev->dev, &gtt->ttm);
1310 }
1311
1312 /**
1313  * amdgpu_ttm_tt_set_userptr -  Initialize userptr GTT ttm_tt
1314  *                                                              for the current task
1315  *
1316  * @ttm: The ttm_tt object to bind this userptr object to
1317  * @addr:  The address in the current tasks VM space to use
1318  * @flags: Requirements of userptr object.
1319  *
1320  * Called by amdgpu_gem_userptr_ioctl() to bind userptr pages
1321  * to current task
1322  */
1323 int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr,
1324                               uint32_t flags)
1325 {
1326         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1327
1328         if (gtt == NULL)
1329                 return -EINVAL;
1330
1331         gtt->userptr = addr;
1332         gtt->userflags = flags;
1333
1334         if (gtt->usertask)
1335                 put_task_struct(gtt->usertask);
1336         gtt->usertask = current->group_leader;
1337         get_task_struct(gtt->usertask);
1338
1339         spin_lock_init(&gtt->guptasklock);
1340         INIT_LIST_HEAD(&gtt->guptasks);
1341         atomic_set(&gtt->mmu_invalidations, 0);
1342         gtt->last_set_pages = 0;
1343
1344         return 0;
1345 }
1346
1347 /**
1348  * amdgpu_ttm_tt_get_usermm - Return memory manager for ttm_tt object
1349  */
1350 struct mm_struct *amdgpu_ttm_tt_get_usermm(struct ttm_tt *ttm)
1351 {
1352         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1353
1354         if (gtt == NULL)
1355                 return NULL;
1356
1357         if (gtt->usertask == NULL)
1358                 return NULL;
1359
1360         return gtt->usertask->mm;
1361 }
1362
1363 /**
1364  * amdgpu_ttm_tt_affect_userptr -       Determine if a ttm_tt object lays
1365  *                                                                      inside an address range for the
1366  *                                                                      current task.
1367  *
1368  */
1369 bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
1370                                   unsigned long end)
1371 {
1372         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1373         struct amdgpu_ttm_gup_task_list *entry;
1374         unsigned long size;
1375
1376         if (gtt == NULL || !gtt->userptr)
1377                 return false;
1378
1379         /* Return false if no part of the ttm_tt object lies within
1380          * the range
1381          */
1382         size = (unsigned long)gtt->ttm.ttm.num_pages * PAGE_SIZE;
1383         if (gtt->userptr > end || gtt->userptr + size <= start)
1384                 return false;
1385
1386         /* Search the lists of tasks that hold this mapping and see
1387          * if current is one of them.  If it is return false.
1388          */
1389         spin_lock(&gtt->guptasklock);
1390         list_for_each_entry(entry, &gtt->guptasks, list) {
1391                 if (entry->task == current) {
1392                         spin_unlock(&gtt->guptasklock);
1393                         return false;
1394                 }
1395         }
1396         spin_unlock(&gtt->guptasklock);
1397
1398         atomic_inc(&gtt->mmu_invalidations);
1399
1400         return true;
1401 }
1402
1403 /**
1404  * amdgpu_ttm_tt_userptr_invalidated -  Has the ttm_tt object been
1405  *                                                                              invalidated?
1406  */
1407 bool amdgpu_ttm_tt_userptr_invalidated(struct ttm_tt *ttm,
1408                                        int *last_invalidated)
1409 {
1410         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1411         int prev_invalidated = *last_invalidated;
1412
1413         *last_invalidated = atomic_read(&gtt->mmu_invalidations);
1414         return prev_invalidated != *last_invalidated;
1415 }
1416
1417 /**
1418  * amdgpu_ttm_tt_userptr_needs_pages -  Have the pages backing this
1419  *                                                                              ttm_tt object been invalidated
1420  *                                                                              since the last time they've
1421  *                                                                              been set?
1422  */
1423 bool amdgpu_ttm_tt_userptr_needs_pages(struct ttm_tt *ttm)
1424 {
1425         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1426
1427         if (gtt == NULL || !gtt->userptr)
1428                 return false;
1429
1430         return atomic_read(&gtt->mmu_invalidations) != gtt->last_set_pages;
1431 }
1432
1433 /**
1434  * amdgpu_ttm_tt_is_readonly - Is the ttm_tt object read only?
1435  */
1436 bool amdgpu_ttm_tt_is_readonly(struct ttm_tt *ttm)
1437 {
1438         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1439
1440         if (gtt == NULL)
1441                 return false;
1442
1443         return !!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
1444 }
1445
1446 /**
1447  * amdgpu_ttm_tt_pte_flags - Compute PTE flags for ttm_tt object
1448  *
1449  * @ttm: The ttm_tt object to compute the flags for
1450  * @mem: The memory registry backing this ttm_tt object
1451  */
1452 uint64_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
1453                                  struct ttm_mem_reg *mem)
1454 {
1455         uint64_t flags = 0;
1456
1457         if (mem && mem->mem_type != TTM_PL_SYSTEM)
1458                 flags |= AMDGPU_PTE_VALID;
1459
1460         if (mem && mem->mem_type == TTM_PL_TT) {
1461                 flags |= AMDGPU_PTE_SYSTEM;
1462
1463                 if (ttm->caching_state == tt_cached)
1464                         flags |= AMDGPU_PTE_SNOOPED;
1465         }
1466
1467         flags |= adev->gart.gart_pte_flags;
1468         flags |= AMDGPU_PTE_READABLE;
1469
1470         if (!amdgpu_ttm_tt_is_readonly(ttm))
1471                 flags |= AMDGPU_PTE_WRITEABLE;
1472
1473         return flags;
1474 }
1475
1476 /**
1477  * amdgpu_ttm_bo_eviction_valuable -    Check to see if we can evict
1478  *                                                                              a buffer object.
1479  *
1480  * Return true if eviction is sensible.  Called by
1481  * ttm_mem_evict_first() on behalf of ttm_bo_mem_force_space()
1482  * which tries to evict buffer objects until it can find space
1483  * for a new object and by ttm_bo_force_list_clean() which is
1484  * used to clean out a memory space.
1485  */
1486 static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
1487                                             const struct ttm_place *place)
1488 {
1489         unsigned long num_pages = bo->mem.num_pages;
1490         struct drm_mm_node *node = bo->mem.mm_node;
1491         struct reservation_object_list *flist;
1492         struct dma_fence *f;
1493         int i;
1494
1495         /* If bo is a KFD BO, check if the bo belongs to the current process.
1496          * If true, then return false as any KFD process needs all its BOs to
1497          * be resident to run successfully
1498          */
1499         flist = reservation_object_get_list(bo->resv);
1500         if (flist) {
1501                 for (i = 0; i < flist->shared_count; ++i) {
1502                         f = rcu_dereference_protected(flist->shared[i],
1503                                 reservation_object_held(bo->resv));
1504                         if (amdkfd_fence_check_mm(f, current->mm))
1505                                 return false;
1506                 }
1507         }
1508
1509         switch (bo->mem.mem_type) {
1510         case TTM_PL_TT:
1511                 return true;
1512
1513         case TTM_PL_VRAM:
1514                 /* Check each drm MM node individually */
1515                 while (num_pages) {
1516                         if (place->fpfn < (node->start + node->size) &&
1517                             !(place->lpfn && place->lpfn <= node->start))
1518                                 return true;
1519
1520                         num_pages -= node->size;
1521                         ++node;
1522                 }
1523                 return false;
1524
1525         default:
1526                 break;
1527         }
1528
1529         return ttm_bo_eviction_valuable(bo, place);
1530 }
1531
1532 /**
1533  * amdgpu_ttm_access_memory -   Read or Write memory that backs a
1534  *                                                              buffer object.
1535  *
1536  * @bo:  The buffer object to read/write
1537  * @offset:  Offset into buffer object
1538  * @buf:  Secondary buffer to write/read from
1539  * @len: Length in bytes of access
1540  * @write:  true if writing
1541  *
1542  * This is used to access VRAM that backs a buffer object via MMIO
1543  * access for debugging purposes.
1544  */
1545 static int amdgpu_ttm_access_memory(struct ttm_buffer_object *bo,
1546                                     unsigned long offset,
1547                                     void *buf, int len, int write)
1548 {
1549         struct amdgpu_bo *abo = ttm_to_amdgpu_bo(bo);
1550         struct amdgpu_device *adev = amdgpu_ttm_adev(abo->tbo.bdev);
1551         struct drm_mm_node *nodes;
1552         uint32_t value = 0;
1553         int ret = 0;
1554         uint64_t pos;
1555         unsigned long flags;
1556
1557         if (bo->mem.mem_type != TTM_PL_VRAM)
1558                 return -EIO;
1559
1560         nodes = amdgpu_find_mm_node(&abo->tbo.mem, &offset);
1561         pos = (nodes->start << PAGE_SHIFT) + offset;
1562
1563         while (len && pos < adev->gmc.mc_vram_size) {
1564                 uint64_t aligned_pos = pos & ~(uint64_t)3;
1565                 uint32_t bytes = 4 - (pos & 3);
1566                 uint32_t shift = (pos & 3) * 8;
1567                 uint32_t mask = 0xffffffff << shift;
1568
1569                 if (len < bytes) {
1570                         mask &= 0xffffffff >> (bytes - len) * 8;
1571                         bytes = len;
1572                 }
1573
1574                 spin_lock_irqsave(&adev->mmio_idx_lock, flags);
1575                 WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)aligned_pos) | 0x80000000);
1576                 WREG32_NO_KIQ(mmMM_INDEX_HI, aligned_pos >> 31);
1577                 if (!write || mask != 0xffffffff)
1578                         value = RREG32_NO_KIQ(mmMM_DATA);
1579                 if (write) {
1580                         value &= ~mask;
1581                         value |= (*(uint32_t *)buf << shift) & mask;
1582                         WREG32_NO_KIQ(mmMM_DATA, value);
1583                 }
1584                 spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
1585                 if (!write) {
1586                         value = (value & mask) >> shift;
1587                         memcpy(buf, &value, bytes);
1588                 }
1589
1590                 ret += bytes;
1591                 buf = (uint8_t *)buf + bytes;
1592                 pos += bytes;
1593                 len -= bytes;
1594                 if (pos >= (nodes->start + nodes->size) << PAGE_SHIFT) {
1595                         ++nodes;
1596                         pos = (nodes->start << PAGE_SHIFT);
1597                 }
1598         }
1599
1600         return ret;
1601 }
1602
1603 static struct ttm_bo_driver amdgpu_bo_driver = {
1604         .ttm_tt_create = &amdgpu_ttm_tt_create,
1605         .ttm_tt_populate = &amdgpu_ttm_tt_populate,
1606         .ttm_tt_unpopulate = &amdgpu_ttm_tt_unpopulate,
1607         .invalidate_caches = &amdgpu_invalidate_caches,
1608         .init_mem_type = &amdgpu_init_mem_type,
1609         .eviction_valuable = amdgpu_ttm_bo_eviction_valuable,
1610         .evict_flags = &amdgpu_evict_flags,
1611         .move = &amdgpu_bo_move,
1612         .verify_access = &amdgpu_verify_access,
1613         .move_notify = &amdgpu_bo_move_notify,
1614         .fault_reserve_notify = &amdgpu_bo_fault_reserve_notify,
1615         .io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
1616         .io_mem_free = &amdgpu_ttm_io_mem_free,
1617         .io_mem_pfn = amdgpu_ttm_io_mem_pfn,
1618         .access_memory = &amdgpu_ttm_access_memory
1619 };
1620
1621 /*
1622  * Firmware Reservation functions
1623  */
1624 /**
1625  * amdgpu_ttm_fw_reserve_vram_fini - free fw reserved vram
1626  *
1627  * @adev: amdgpu_device pointer
1628  *
1629  * free fw reserved vram if it has been reserved.
1630  */
1631 static void amdgpu_ttm_fw_reserve_vram_fini(struct amdgpu_device *adev)
1632 {
1633         amdgpu_bo_free_kernel(&adev->fw_vram_usage.reserved_bo,
1634                 NULL, &adev->fw_vram_usage.va);
1635 }
1636
1637 /**
1638  * amdgpu_ttm_fw_reserve_vram_init - create bo vram reservation from fw
1639  *
1640  * @adev: amdgpu_device pointer
1641  *
1642  * create bo vram reservation from fw.
1643  */
1644 static int amdgpu_ttm_fw_reserve_vram_init(struct amdgpu_device *adev)
1645 {
1646         struct ttm_operation_ctx ctx = { false, false };
1647         struct amdgpu_bo_param bp;
1648         int r = 0;
1649         int i;
1650         u64 vram_size = adev->gmc.visible_vram_size;
1651         u64 offset = adev->fw_vram_usage.start_offset;
1652         u64 size = adev->fw_vram_usage.size;
1653         struct amdgpu_bo *bo;
1654
1655         memset(&bp, 0, sizeof(bp));
1656         bp.size = adev->fw_vram_usage.size;
1657         bp.byte_align = PAGE_SIZE;
1658         bp.domain = AMDGPU_GEM_DOMAIN_VRAM;
1659         bp.flags = AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
1660                 AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
1661         bp.type = ttm_bo_type_kernel;
1662         bp.resv = NULL;
1663         adev->fw_vram_usage.va = NULL;
1664         adev->fw_vram_usage.reserved_bo = NULL;
1665
1666         if (adev->fw_vram_usage.size > 0 &&
1667                 adev->fw_vram_usage.size <= vram_size) {
1668
1669                 r = amdgpu_bo_create(adev, &bp,
1670                                      &adev->fw_vram_usage.reserved_bo);
1671                 if (r)
1672                         goto error_create;
1673
1674                 r = amdgpu_bo_reserve(adev->fw_vram_usage.reserved_bo, false);
1675                 if (r)
1676                         goto error_reserve;
1677
1678                 /* remove the original mem node and create a new one at the
1679                  * request position
1680                  */
1681                 bo = adev->fw_vram_usage.reserved_bo;
1682                 offset = ALIGN(offset, PAGE_SIZE);
1683                 for (i = 0; i < bo->placement.num_placement; ++i) {
1684                         bo->placements[i].fpfn = offset >> PAGE_SHIFT;
1685                         bo->placements[i].lpfn = (offset + size) >> PAGE_SHIFT;
1686                 }
1687
1688                 ttm_bo_mem_put(&bo->tbo, &bo->tbo.mem);
1689                 r = ttm_bo_mem_space(&bo->tbo, &bo->placement,
1690                                      &bo->tbo.mem, &ctx);
1691                 if (r)
1692                         goto error_pin;
1693
1694                 r = amdgpu_bo_pin_restricted(adev->fw_vram_usage.reserved_bo,
1695                         AMDGPU_GEM_DOMAIN_VRAM,
1696                         adev->fw_vram_usage.start_offset,
1697                         (adev->fw_vram_usage.start_offset +
1698                         adev->fw_vram_usage.size), NULL);
1699                 if (r)
1700                         goto error_pin;
1701                 r = amdgpu_bo_kmap(adev->fw_vram_usage.reserved_bo,
1702                         &adev->fw_vram_usage.va);
1703                 if (r)
1704                         goto error_kmap;
1705
1706                 amdgpu_bo_unreserve(adev->fw_vram_usage.reserved_bo);
1707         }
1708         return r;
1709
1710 error_kmap:
1711         amdgpu_bo_unpin(adev->fw_vram_usage.reserved_bo);
1712 error_pin:
1713         amdgpu_bo_unreserve(adev->fw_vram_usage.reserved_bo);
1714 error_reserve:
1715         amdgpu_bo_unref(&adev->fw_vram_usage.reserved_bo);
1716 error_create:
1717         adev->fw_vram_usage.va = NULL;
1718         adev->fw_vram_usage.reserved_bo = NULL;
1719         return r;
1720 }
1721 /**
1722  * amdgpu_ttm_init -    Init the memory management (ttm) as well as
1723  *                                              various gtt/vram related fields.
1724  *
1725  * This initializes all of the memory space pools that the TTM layer
1726  * will need such as the GTT space (system memory mapped to the device),
1727  * VRAM (on-board memory), and on-chip memories (GDS, GWS, OA) which
1728  * can be mapped per VMID.
1729  */
1730 int amdgpu_ttm_init(struct amdgpu_device *adev)
1731 {
1732         uint64_t gtt_size;
1733         int r;
1734         u64 vis_vram_limit;
1735
1736         /* initialize global references for vram/gtt */
1737         r = amdgpu_ttm_global_init(adev);
1738         if (r) {
1739                 return r;
1740         }
1741         /* No others user of address space so set it to 0 */
1742         r = ttm_bo_device_init(&adev->mman.bdev,
1743                                adev->mman.bo_global_ref.ref.object,
1744                                &amdgpu_bo_driver,
1745                                adev->ddev->anon_inode->i_mapping,
1746                                DRM_FILE_PAGE_OFFSET,
1747                                adev->need_dma32);
1748         if (r) {
1749                 DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
1750                 return r;
1751         }
1752         adev->mman.initialized = true;
1753
1754         /* We opt to avoid OOM on system pages allocations */
1755         adev->mman.bdev.no_retry = true;
1756
1757         /* Initialize VRAM pool with all of VRAM divided into pages */
1758         r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_VRAM,
1759                                 adev->gmc.real_vram_size >> PAGE_SHIFT);
1760         if (r) {
1761                 DRM_ERROR("Failed initializing VRAM heap.\n");
1762                 return r;
1763         }
1764
1765         /* Reduce size of CPU-visible VRAM if requested */
1766         vis_vram_limit = (u64)amdgpu_vis_vram_limit * 1024 * 1024;
1767         if (amdgpu_vis_vram_limit > 0 &&
1768             vis_vram_limit <= adev->gmc.visible_vram_size)
1769                 adev->gmc.visible_vram_size = vis_vram_limit;
1770
1771         /* Change the size here instead of the init above so only lpfn is affected */
1772         amdgpu_ttm_set_buffer_funcs_status(adev, false);
1773 #ifdef CONFIG_64BIT
1774         adev->mman.aper_base_kaddr = ioremap_wc(adev->gmc.aper_base,
1775                                                 adev->gmc.visible_vram_size);
1776 #endif
1777
1778         /*
1779          *The reserved vram for firmware must be pinned to the specified
1780          *place on the VRAM, so reserve it early.
1781          */
1782         r = amdgpu_ttm_fw_reserve_vram_init(adev);
1783         if (r) {
1784                 return r;
1785         }
1786
1787         /* allocate memory as required for VGA
1788          * This is used for VGA emulation and pre-OS scanout buffers to
1789          * avoid display artifacts while transitioning between pre-OS
1790          * and driver.  */
1791         if (adev->gmc.stolen_size) {
1792                 r = amdgpu_bo_create_kernel(adev, adev->gmc.stolen_size, PAGE_SIZE,
1793                                             AMDGPU_GEM_DOMAIN_VRAM,
1794                                             &adev->stolen_vga_memory,
1795                                             NULL, NULL);
1796                 if (r)
1797                         return r;
1798         }
1799         DRM_INFO("amdgpu: %uM of VRAM memory ready\n",
1800                  (unsigned) (adev->gmc.real_vram_size / (1024 * 1024)));
1801
1802         /* Compute GTT size, either bsaed on 3/4th the size of RAM size
1803          * or whatever the user passed on module init */
1804         if (amdgpu_gtt_size == -1) {
1805                 struct sysinfo si;
1806
1807                 si_meminfo(&si);
1808                 gtt_size = min(max((AMDGPU_DEFAULT_GTT_SIZE_MB << 20),
1809                                adev->gmc.mc_vram_size),
1810                                ((uint64_t)si.totalram * si.mem_unit * 3/4));
1811         }
1812         else
1813                 gtt_size = (uint64_t)amdgpu_gtt_size << 20;
1814
1815         /* Initialize GTT memory pool */
1816         r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_TT, gtt_size >> PAGE_SHIFT);
1817         if (r) {
1818                 DRM_ERROR("Failed initializing GTT heap.\n");
1819                 return r;
1820         }
1821         DRM_INFO("amdgpu: %uM of GTT memory ready.\n",
1822                  (unsigned)(gtt_size / (1024 * 1024)));
1823
1824         /* Initialize various on-chip memory pools */
1825         adev->gds.mem.total_size = adev->gds.mem.total_size << AMDGPU_GDS_SHIFT;
1826         adev->gds.mem.gfx_partition_size = adev->gds.mem.gfx_partition_size << AMDGPU_GDS_SHIFT;
1827         adev->gds.mem.cs_partition_size = adev->gds.mem.cs_partition_size << AMDGPU_GDS_SHIFT;
1828         adev->gds.gws.total_size = adev->gds.gws.total_size << AMDGPU_GWS_SHIFT;
1829         adev->gds.gws.gfx_partition_size = adev->gds.gws.gfx_partition_size << AMDGPU_GWS_SHIFT;
1830         adev->gds.gws.cs_partition_size = adev->gds.gws.cs_partition_size << AMDGPU_GWS_SHIFT;
1831         adev->gds.oa.total_size = adev->gds.oa.total_size << AMDGPU_OA_SHIFT;
1832         adev->gds.oa.gfx_partition_size = adev->gds.oa.gfx_partition_size << AMDGPU_OA_SHIFT;
1833         adev->gds.oa.cs_partition_size = adev->gds.oa.cs_partition_size << AMDGPU_OA_SHIFT;
1834         /* GDS Memory */
1835         if (adev->gds.mem.total_size) {
1836                 r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_GDS,
1837                                    adev->gds.mem.total_size >> PAGE_SHIFT);
1838                 if (r) {
1839                         DRM_ERROR("Failed initializing GDS heap.\n");
1840                         return r;
1841                 }
1842         }
1843
1844         /* GWS */
1845         if (adev->gds.gws.total_size) {
1846                 r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_GWS,
1847                                    adev->gds.gws.total_size >> PAGE_SHIFT);
1848                 if (r) {
1849                         DRM_ERROR("Failed initializing gws heap.\n");
1850                         return r;
1851                 }
1852         }
1853
1854         /* OA */
1855         if (adev->gds.oa.total_size) {
1856                 r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_OA,
1857                                    adev->gds.oa.total_size >> PAGE_SHIFT);
1858                 if (r) {
1859                         DRM_ERROR("Failed initializing oa heap.\n");
1860                         return r;
1861                 }
1862         }
1863
1864         /* Register debugfs entries for amdgpu_ttm */
1865         r = amdgpu_ttm_debugfs_init(adev);
1866         if (r) {
1867                 DRM_ERROR("Failed to init debugfs\n");
1868                 return r;
1869         }
1870         return 0;
1871 }
1872
1873 /**
1874  * amdgpu_ttm_late_init -       Handle any late initialization for
1875  *                                                      amdgpu_ttm
1876  */
1877 void amdgpu_ttm_late_init(struct amdgpu_device *adev)
1878 {
1879         /* return the VGA stolen memory (if any) back to VRAM */
1880         amdgpu_bo_free_kernel(&adev->stolen_vga_memory, NULL, NULL);
1881 }
1882
1883 /**
1884  * amdgpu_ttm_fini - De-initialize the TTM memory pools
1885  */
1886 void amdgpu_ttm_fini(struct amdgpu_device *adev)
1887 {
1888         if (!adev->mman.initialized)
1889                 return;
1890
1891         amdgpu_ttm_debugfs_fini(adev);
1892         amdgpu_ttm_fw_reserve_vram_fini(adev);
1893         if (adev->mman.aper_base_kaddr)
1894                 iounmap(adev->mman.aper_base_kaddr);
1895         adev->mman.aper_base_kaddr = NULL;
1896
1897         ttm_bo_clean_mm(&adev->mman.bdev, TTM_PL_VRAM);
1898         ttm_bo_clean_mm(&adev->mman.bdev, TTM_PL_TT);
1899         if (adev->gds.mem.total_size)
1900                 ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_GDS);
1901         if (adev->gds.gws.total_size)
1902                 ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_GWS);
1903         if (adev->gds.oa.total_size)
1904                 ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_OA);
1905         ttm_bo_device_release(&adev->mman.bdev);
1906         amdgpu_ttm_global_fini(adev);
1907         adev->mman.initialized = false;
1908         DRM_INFO("amdgpu: ttm finalized\n");
1909 }
1910
1911 /**
1912  * amdgpu_ttm_set_buffer_funcs_status - enable/disable use of buffer functions
1913  *
1914  * @adev: amdgpu_device pointer
1915  * @enable: true when we can use buffer functions.
1916  *
1917  * Enable/disable use of buffer functions during suspend/resume. This should
1918  * only be called at bootup or when userspace isn't running.
1919  */
1920 void amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable)
1921 {
1922         struct ttm_mem_type_manager *man = &adev->mman.bdev.man[TTM_PL_VRAM];
1923         uint64_t size;
1924
1925         if (!adev->mman.initialized || adev->in_gpu_reset)
1926                 return;
1927
1928         /* this just adjusts TTM size idea, which sets lpfn to the correct value */
1929         if (enable)
1930                 size = adev->gmc.real_vram_size;
1931         else
1932                 size = adev->gmc.visible_vram_size;
1933         man->size = size >> PAGE_SHIFT;
1934         adev->mman.buffer_funcs_enabled = enable;
1935 }
1936
1937 int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma)
1938 {
1939         struct drm_file *file_priv;
1940         struct amdgpu_device *adev;
1941
1942         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
1943                 return -EINVAL;
1944
1945         file_priv = filp->private_data;
1946         adev = file_priv->minor->dev->dev_private;
1947         if (adev == NULL)
1948                 return -EINVAL;
1949
1950         return ttm_bo_mmap(filp, vma, &adev->mman.bdev);
1951 }
1952
1953 static int amdgpu_map_buffer(struct ttm_buffer_object *bo,
1954                              struct ttm_mem_reg *mem, unsigned num_pages,
1955                              uint64_t offset, unsigned window,
1956                              struct amdgpu_ring *ring,
1957                              uint64_t *addr)
1958 {
1959         struct amdgpu_ttm_tt *gtt = (void *)bo->ttm;
1960         struct amdgpu_device *adev = ring->adev;
1961         struct ttm_tt *ttm = bo->ttm;
1962         struct amdgpu_job *job;
1963         unsigned num_dw, num_bytes;
1964         dma_addr_t *dma_address;
1965         struct dma_fence *fence;
1966         uint64_t src_addr, dst_addr;
1967         uint64_t flags;
1968         int r;
1969
1970         BUG_ON(adev->mman.buffer_funcs->copy_max_bytes <
1971                AMDGPU_GTT_MAX_TRANSFER_SIZE * 8);
1972
1973         *addr = adev->gmc.gart_start;
1974         *addr += (u64)window * AMDGPU_GTT_MAX_TRANSFER_SIZE *
1975                 AMDGPU_GPU_PAGE_SIZE;
1976
1977         num_dw = adev->mman.buffer_funcs->copy_num_dw;
1978         while (num_dw & 0x7)
1979                 num_dw++;
1980
1981         num_bytes = num_pages * 8;
1982
1983         r = amdgpu_job_alloc_with_ib(adev, num_dw * 4 + num_bytes, &job);
1984         if (r)
1985                 return r;
1986
1987         src_addr = num_dw * 4;
1988         src_addr += job->ibs[0].gpu_addr;
1989
1990         dst_addr = adev->gart.table_addr;
1991         dst_addr += window * AMDGPU_GTT_MAX_TRANSFER_SIZE * 8;
1992         amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_addr,
1993                                 dst_addr, num_bytes);
1994
1995         amdgpu_ring_pad_ib(ring, &job->ibs[0]);
1996         WARN_ON(job->ibs[0].length_dw > num_dw);
1997
1998         dma_address = &gtt->ttm.dma_address[offset >> PAGE_SHIFT];
1999         flags = amdgpu_ttm_tt_pte_flags(adev, ttm, mem);
2000         r = amdgpu_gart_map(adev, 0, num_pages, dma_address, flags,
2001                             &job->ibs[0].ptr[num_dw]);
2002         if (r)
2003                 goto error_free;
2004
2005         r = amdgpu_job_submit(job, ring, &adev->mman.entity,
2006                               AMDGPU_FENCE_OWNER_UNDEFINED, &fence);
2007         if (r)
2008                 goto error_free;
2009
2010         dma_fence_put(fence);
2011
2012         return r;
2013
2014 error_free:
2015         amdgpu_job_free(job);
2016         return r;
2017 }
2018
2019 int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
2020                        uint64_t dst_offset, uint32_t byte_count,
2021                        struct reservation_object *resv,
2022                        struct dma_fence **fence, bool direct_submit,
2023                        bool vm_needs_flush)
2024 {
2025         struct amdgpu_device *adev = ring->adev;
2026         struct amdgpu_job *job;
2027
2028         uint32_t max_bytes;
2029         unsigned num_loops, num_dw;
2030         unsigned i;
2031         int r;
2032
2033         if (direct_submit && !ring->ready) {
2034                 DRM_ERROR("Trying to move memory with ring turned off.\n");
2035                 return -EINVAL;
2036         }
2037
2038         max_bytes = adev->mman.buffer_funcs->copy_max_bytes;
2039         num_loops = DIV_ROUND_UP(byte_count, max_bytes);
2040         num_dw = num_loops * adev->mman.buffer_funcs->copy_num_dw;
2041
2042         /* for IB padding */
2043         while (num_dw & 0x7)
2044                 num_dw++;
2045
2046         r = amdgpu_job_alloc_with_ib(adev, num_dw * 4, &job);
2047         if (r)
2048                 return r;
2049
2050         job->vm_needs_flush = vm_needs_flush;
2051         if (resv) {
2052                 r = amdgpu_sync_resv(adev, &job->sync, resv,
2053                                      AMDGPU_FENCE_OWNER_UNDEFINED,
2054                                      false);
2055                 if (r) {
2056                         DRM_ERROR("sync failed (%d).\n", r);
2057                         goto error_free;
2058                 }
2059         }
2060
2061         for (i = 0; i < num_loops; i++) {
2062                 uint32_t cur_size_in_bytes = min(byte_count, max_bytes);
2063
2064                 amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_offset,
2065                                         dst_offset, cur_size_in_bytes);
2066
2067                 src_offset += cur_size_in_bytes;
2068                 dst_offset += cur_size_in_bytes;
2069                 byte_count -= cur_size_in_bytes;
2070         }
2071
2072         amdgpu_ring_pad_ib(ring, &job->ibs[0]);
2073         WARN_ON(job->ibs[0].length_dw > num_dw);
2074         if (direct_submit) {
2075                 r = amdgpu_ib_schedule(ring, job->num_ibs, job->ibs,
2076                                        NULL, fence);
2077                 job->fence = dma_fence_get(*fence);
2078                 if (r)
2079                         DRM_ERROR("Error scheduling IBs (%d)\n", r);
2080                 amdgpu_job_free(job);
2081         } else {
2082                 r = amdgpu_job_submit(job, ring, &adev->mman.entity,
2083                                       AMDGPU_FENCE_OWNER_UNDEFINED, fence);
2084                 if (r)
2085                         goto error_free;
2086         }
2087
2088         return r;
2089
2090 error_free:
2091         amdgpu_job_free(job);
2092         return r;
2093 }
2094
2095 int amdgpu_fill_buffer(struct amdgpu_bo *bo,
2096                        uint32_t src_data,
2097                        struct reservation_object *resv,
2098                        struct dma_fence **fence)
2099 {
2100         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
2101         uint32_t max_bytes = adev->mman.buffer_funcs->fill_max_bytes;
2102         struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
2103
2104         struct drm_mm_node *mm_node;
2105         unsigned long num_pages;
2106         unsigned int num_loops, num_dw;
2107
2108         struct amdgpu_job *job;
2109         int r;
2110
2111         if (!adev->mman.buffer_funcs_enabled) {
2112                 DRM_ERROR("Trying to clear memory with ring turned off.\n");
2113                 return -EINVAL;
2114         }
2115
2116         if (bo->tbo.mem.mem_type == TTM_PL_TT) {
2117                 r = amdgpu_ttm_alloc_gart(&bo->tbo);
2118                 if (r)
2119                         return r;
2120         }
2121
2122         num_pages = bo->tbo.num_pages;
2123         mm_node = bo->tbo.mem.mm_node;
2124         num_loops = 0;
2125         while (num_pages) {
2126                 uint32_t byte_count = mm_node->size << PAGE_SHIFT;
2127
2128                 num_loops += DIV_ROUND_UP(byte_count, max_bytes);
2129                 num_pages -= mm_node->size;
2130                 ++mm_node;
2131         }
2132         num_dw = num_loops * adev->mman.buffer_funcs->fill_num_dw;
2133
2134         /* for IB padding */
2135         num_dw += 64;
2136
2137         r = amdgpu_job_alloc_with_ib(adev, num_dw * 4, &job);
2138         if (r)
2139                 return r;
2140
2141         if (resv) {
2142                 r = amdgpu_sync_resv(adev, &job->sync, resv,
2143                                      AMDGPU_FENCE_OWNER_UNDEFINED, false);
2144                 if (r) {
2145                         DRM_ERROR("sync failed (%d).\n", r);
2146                         goto error_free;
2147                 }
2148         }
2149
2150         num_pages = bo->tbo.num_pages;
2151         mm_node = bo->tbo.mem.mm_node;
2152
2153         while (num_pages) {
2154                 uint32_t byte_count = mm_node->size << PAGE_SHIFT;
2155                 uint64_t dst_addr;
2156
2157                 dst_addr = amdgpu_mm_node_addr(&bo->tbo, mm_node, &bo->tbo.mem);
2158                 while (byte_count) {
2159                         uint32_t cur_size_in_bytes = min(byte_count, max_bytes);
2160
2161                         amdgpu_emit_fill_buffer(adev, &job->ibs[0], src_data,
2162                                                 dst_addr, cur_size_in_bytes);
2163
2164                         dst_addr += cur_size_in_bytes;
2165                         byte_count -= cur_size_in_bytes;
2166                 }
2167
2168                 num_pages -= mm_node->size;
2169                 ++mm_node;
2170         }
2171
2172         amdgpu_ring_pad_ib(ring, &job->ibs[0]);
2173         WARN_ON(job->ibs[0].length_dw > num_dw);
2174         r = amdgpu_job_submit(job, ring, &adev->mman.entity,
2175                               AMDGPU_FENCE_OWNER_UNDEFINED, fence);
2176         if (r)
2177                 goto error_free;
2178
2179         return 0;
2180
2181 error_free:
2182         amdgpu_job_free(job);
2183         return r;
2184 }
2185
2186 #if defined(CONFIG_DEBUG_FS)
2187
2188 static int amdgpu_mm_dump_table(struct seq_file *m, void *data)
2189 {
2190         struct drm_info_node *node = (struct drm_info_node *)m->private;
2191         unsigned ttm_pl = *(int *)node->info_ent->data;
2192         struct drm_device *dev = node->minor->dev;
2193         struct amdgpu_device *adev = dev->dev_private;
2194         struct ttm_mem_type_manager *man = &adev->mman.bdev.man[ttm_pl];
2195         struct drm_printer p = drm_seq_file_printer(m);
2196
2197         man->func->debug(man, &p);
2198         return 0;
2199 }
2200
2201 static int ttm_pl_vram = TTM_PL_VRAM;
2202 static int ttm_pl_tt = TTM_PL_TT;
2203
2204 static const struct drm_info_list amdgpu_ttm_debugfs_list[] = {
2205         {"amdgpu_vram_mm", amdgpu_mm_dump_table, 0, &ttm_pl_vram},
2206         {"amdgpu_gtt_mm", amdgpu_mm_dump_table, 0, &ttm_pl_tt},
2207         {"ttm_page_pool", ttm_page_alloc_debugfs, 0, NULL},
2208 #ifdef CONFIG_SWIOTLB
2209         {"ttm_dma_page_pool", ttm_dma_page_alloc_debugfs, 0, NULL}
2210 #endif
2211 };
2212
2213 /**
2214  * amdgpu_ttm_vram_read - Linear read access to VRAM
2215  *
2216  * Accesses VRAM via MMIO for debugging purposes.
2217  */
2218 static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf,
2219                                     size_t size, loff_t *pos)
2220 {
2221         struct amdgpu_device *adev = file_inode(f)->i_private;
2222         ssize_t result = 0;
2223         int r;
2224
2225         if (size & 0x3 || *pos & 0x3)
2226                 return -EINVAL;
2227
2228         if (*pos >= adev->gmc.mc_vram_size)
2229                 return -ENXIO;
2230
2231         while (size) {
2232                 unsigned long flags;
2233                 uint32_t value;
2234
2235                 if (*pos >= adev->gmc.mc_vram_size)
2236                         return result;
2237
2238                 spin_lock_irqsave(&adev->mmio_idx_lock, flags);
2239                 WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)*pos) | 0x80000000);
2240                 WREG32_NO_KIQ(mmMM_INDEX_HI, *pos >> 31);
2241                 value = RREG32_NO_KIQ(mmMM_DATA);
2242                 spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
2243
2244                 r = put_user(value, (uint32_t *)buf);
2245                 if (r)
2246                         return r;
2247
2248                 result += 4;
2249                 buf += 4;
2250                 *pos += 4;
2251                 size -= 4;
2252         }
2253
2254         return result;
2255 }
2256
2257 /**
2258  * amdgpu_ttm_vram_write - Linear write access to VRAM
2259  *
2260  * Accesses VRAM via MMIO for debugging purposes.
2261  */
2262 static ssize_t amdgpu_ttm_vram_write(struct file *f, const char __user *buf,
2263                                     size_t size, loff_t *pos)
2264 {
2265         struct amdgpu_device *adev = file_inode(f)->i_private;
2266         ssize_t result = 0;
2267         int r;
2268
2269         if (size & 0x3 || *pos & 0x3)
2270                 return -EINVAL;
2271
2272         if (*pos >= adev->gmc.mc_vram_size)
2273                 return -ENXIO;
2274
2275         while (size) {
2276                 unsigned long flags;
2277                 uint32_t value;
2278
2279                 if (*pos >= adev->gmc.mc_vram_size)
2280                         return result;
2281
2282                 r = get_user(value, (uint32_t *)buf);
2283                 if (r)
2284                         return r;
2285
2286                 spin_lock_irqsave(&adev->mmio_idx_lock, flags);
2287                 WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)*pos) | 0x80000000);
2288                 WREG32_NO_KIQ(mmMM_INDEX_HI, *pos >> 31);
2289                 WREG32_NO_KIQ(mmMM_DATA, value);
2290                 spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
2291
2292                 result += 4;
2293                 buf += 4;
2294                 *pos += 4;
2295                 size -= 4;
2296         }
2297
2298         return result;
2299 }
2300
2301 static const struct file_operations amdgpu_ttm_vram_fops = {
2302         .owner = THIS_MODULE,
2303         .read = amdgpu_ttm_vram_read,
2304         .write = amdgpu_ttm_vram_write,
2305         .llseek = default_llseek,
2306 };
2307
2308 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
2309
2310 /**
2311  * amdgpu_ttm_gtt_read - Linear read access to GTT memory
2312  */
2313 static ssize_t amdgpu_ttm_gtt_read(struct file *f, char __user *buf,
2314                                    size_t size, loff_t *pos)
2315 {
2316         struct amdgpu_device *adev = file_inode(f)->i_private;
2317         ssize_t result = 0;
2318         int r;
2319
2320         while (size) {
2321                 loff_t p = *pos / PAGE_SIZE;
2322                 unsigned off = *pos & ~PAGE_MASK;
2323                 size_t cur_size = min_t(size_t, size, PAGE_SIZE - off);
2324                 struct page *page;
2325                 void *ptr;
2326
2327                 if (p >= adev->gart.num_cpu_pages)
2328                         return result;
2329
2330                 page = adev->gart.pages[p];
2331                 if (page) {
2332                         ptr = kmap(page);
2333                         ptr += off;
2334
2335                         r = copy_to_user(buf, ptr, cur_size);
2336                         kunmap(adev->gart.pages[p]);
2337                 } else
2338                         r = clear_user(buf, cur_size);
2339
2340                 if (r)
2341                         return -EFAULT;
2342
2343                 result += cur_size;
2344                 buf += cur_size;
2345                 *pos += cur_size;
2346                 size -= cur_size;
2347         }
2348
2349         return result;
2350 }
2351
2352 static const struct file_operations amdgpu_ttm_gtt_fops = {
2353         .owner = THIS_MODULE,
2354         .read = amdgpu_ttm_gtt_read,
2355         .llseek = default_llseek
2356 };
2357
2358 #endif
2359
2360 /**
2361  * amdgpu_iomem_read - Virtual read access to GPU mapped memory
2362  *
2363  * This function is used to read memory that has been mapped to the
2364  * GPU and the known addresses are not physical addresses but instead
2365  * bus addresses (e.g., what you'd put in an IB or ring buffer).
2366  */
2367 static ssize_t amdgpu_iomem_read(struct file *f, char __user *buf,
2368                                  size_t size, loff_t *pos)
2369 {
2370         struct amdgpu_device *adev = file_inode(f)->i_private;
2371         struct iommu_domain *dom;
2372         ssize_t result = 0;
2373         int r;
2374
2375         /* retrieve the IOMMU domain if any for this device */
2376         dom = iommu_get_domain_for_dev(adev->dev);
2377
2378         while (size) {
2379                 phys_addr_t addr = *pos & PAGE_MASK;
2380                 loff_t off = *pos & ~PAGE_MASK;
2381                 size_t bytes = PAGE_SIZE - off;
2382                 unsigned long pfn;
2383                 struct page *p;
2384                 void *ptr;
2385
2386                 bytes = bytes < size ? bytes : size;
2387
2388                 /* Translate the bus address to a physical address.  If
2389                  * the domain is NULL it means there is no IOMMU active
2390                  * and the address translation is the identity
2391                  */
2392                 addr = dom ? iommu_iova_to_phys(dom, addr) : addr;
2393
2394                 pfn = addr >> PAGE_SHIFT;
2395                 if (!pfn_valid(pfn))
2396                         return -EPERM;
2397
2398                 p = pfn_to_page(pfn);
2399                 if (p->mapping != adev->mman.bdev.dev_mapping)
2400                         return -EPERM;
2401
2402                 ptr = kmap(p);
2403                 r = copy_to_user(buf, ptr + off, bytes);
2404                 kunmap(p);
2405                 if (r)
2406                         return -EFAULT;
2407
2408                 size -= bytes;
2409                 *pos += bytes;
2410                 result += bytes;
2411         }
2412
2413         return result;
2414 }
2415
2416 /**
2417  * amdgpu_iomem_write - Virtual write access to GPU mapped memory
2418  *
2419  * This function is used to write memory that has been mapped to the
2420  * GPU and the known addresses are not physical addresses but instead
2421  * bus addresses (e.g., what you'd put in an IB or ring buffer).
2422  */
2423 static ssize_t amdgpu_iomem_write(struct file *f, const char __user *buf,
2424                                  size_t size, loff_t *pos)
2425 {
2426         struct amdgpu_device *adev = file_inode(f)->i_private;
2427         struct iommu_domain *dom;
2428         ssize_t result = 0;
2429         int r;
2430
2431         dom = iommu_get_domain_for_dev(adev->dev);
2432
2433         while (size) {
2434                 phys_addr_t addr = *pos & PAGE_MASK;
2435                 loff_t off = *pos & ~PAGE_MASK;
2436                 size_t bytes = PAGE_SIZE - off;
2437                 unsigned long pfn;
2438                 struct page *p;
2439                 void *ptr;
2440
2441                 bytes = bytes < size ? bytes : size;
2442
2443                 addr = dom ? iommu_iova_to_phys(dom, addr) : addr;
2444
2445                 pfn = addr >> PAGE_SHIFT;
2446                 if (!pfn_valid(pfn))
2447                         return -EPERM;
2448
2449                 p = pfn_to_page(pfn);
2450                 if (p->mapping != adev->mman.bdev.dev_mapping)
2451                         return -EPERM;
2452
2453                 ptr = kmap(p);
2454                 r = copy_from_user(ptr + off, buf, bytes);
2455                 kunmap(p);
2456                 if (r)
2457                         return -EFAULT;
2458
2459                 size -= bytes;
2460                 *pos += bytes;
2461                 result += bytes;
2462         }
2463
2464         return result;
2465 }
2466
2467 static const struct file_operations amdgpu_ttm_iomem_fops = {
2468         .owner = THIS_MODULE,
2469         .read = amdgpu_iomem_read,
2470         .write = amdgpu_iomem_write,
2471         .llseek = default_llseek
2472 };
2473
2474 static const struct {
2475         char *name;
2476         const struct file_operations *fops;
2477         int domain;
2478 } ttm_debugfs_entries[] = {
2479         { "amdgpu_vram", &amdgpu_ttm_vram_fops, TTM_PL_VRAM },
2480 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
2481         { "amdgpu_gtt", &amdgpu_ttm_gtt_fops, TTM_PL_TT },
2482 #endif
2483         { "amdgpu_iomem", &amdgpu_ttm_iomem_fops, TTM_PL_SYSTEM },
2484 };
2485
2486 #endif
2487
2488 static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev)
2489 {
2490 #if defined(CONFIG_DEBUG_FS)
2491         unsigned count;
2492
2493         struct drm_minor *minor = adev->ddev->primary;
2494         struct dentry *ent, *root = minor->debugfs_root;
2495
2496         for (count = 0; count < ARRAY_SIZE(ttm_debugfs_entries); count++) {
2497                 ent = debugfs_create_file(
2498                                 ttm_debugfs_entries[count].name,
2499                                 S_IFREG | S_IRUGO, root,
2500                                 adev,
2501                                 ttm_debugfs_entries[count].fops);
2502                 if (IS_ERR(ent))
2503                         return PTR_ERR(ent);
2504                 if (ttm_debugfs_entries[count].domain == TTM_PL_VRAM)
2505                         i_size_write(ent->d_inode, adev->gmc.mc_vram_size);
2506                 else if (ttm_debugfs_entries[count].domain == TTM_PL_TT)
2507                         i_size_write(ent->d_inode, adev->gmc.gart_size);
2508                 adev->mman.debugfs_entries[count] = ent;
2509         }
2510
2511         count = ARRAY_SIZE(amdgpu_ttm_debugfs_list);
2512
2513 #ifdef CONFIG_SWIOTLB
2514         if (!(adev->need_swiotlb && swiotlb_nr_tbl()))
2515                 --count;
2516 #endif
2517
2518         return amdgpu_debugfs_add_files(adev, amdgpu_ttm_debugfs_list, count);
2519 #else
2520         return 0;
2521 #endif
2522 }
2523
2524 static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev)
2525 {
2526 #if defined(CONFIG_DEBUG_FS)
2527         unsigned i;
2528
2529         for (i = 0; i < ARRAY_SIZE(ttm_debugfs_entries); i++)
2530                 debugfs_remove(adev->mman.debugfs_entries[i]);
2531 #endif
2532 }