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
  33 #include <linux/dma-mapping.h>
  34 #include <linux/iommu.h>
  35 #include <linux/hmm.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/sched/task.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/slab.h>
  40 #include <linux/swap.h>
  41 #include <linux/swiotlb.h>
  42
  43 #include <drm/ttm/ttm_bo_api.h>
  44 #include <drm/ttm/ttm_bo_driver.h>
  45 #include <drm/ttm/ttm_placement.h>
  46 #include <drm/ttm/ttm_module.h>
  47 #include <drm/ttm/ttm_page_alloc.h>
  48
  49 #include <drm/drm_debugfs.h>
  50 #include <drm/amdgpu_drm.h>
  51
  52 #include "amdgpu.h"
  53 #include "amdgpu_object.h"
  54 #include "amdgpu_trace.h"
  55 #include "amdgpu_amdkfd.h"
  56 #include "amdgpu_sdma.h"
  57 #include "bif/bif_4_1_d.h"
  58
  59 static int amdgpu_map_buffer(struct ttm_buffer_object *bo,
  60                              struct ttm_mem_reg *mem, unsigned num_pages,
  61                              uint64_t offset, unsigned window,
  62                              struct amdgpu_ring *ring,
  63                              uint64_t *addr);
  64
  65 static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev);
  66 static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev);
  67
  68 static int amdgpu_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
  69 {
  70         return 0;
  71 }
  72
  73 /**
  74  * amdgpu_init_mem_type - Initialize a memory manager for a specific type of
  75  * memory request.
  76  *
  77  * @bdev: The TTM BO device object (contains a reference to amdgpu_device)
  78  * @type: The type of memory requested
  79  * @man: The memory type manager for each domain
  80  *
  81  * This is called by ttm_bo_init_mm() when a buffer object is being
  82  * initialized.
  83  */
  84 static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
  85                                 struct ttm_mem_type_manager *man)
  86 {
  87         struct amdgpu_device *adev;
  88
  89         adev = amdgpu_ttm_adev(bdev);
  90
  91         switch (type) {
  92         case TTM_PL_SYSTEM:
  93                 /* System memory */
  94                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
  95                 man->available_caching = TTM_PL_MASK_CACHING;
  96                 man->default_caching = TTM_PL_FLAG_CACHED;
  97                 break;
  98         case TTM_PL_TT:
  99                 /* GTT memory  */
 100                 man->func = &amdgpu_gtt_mgr_func;
 101                 man->gpu_offset = adev->gmc.gart_start;
 102                 man->available_caching = TTM_PL_MASK_CACHING;
 103                 man->default_caching = TTM_PL_FLAG_CACHED;
 104                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE | TTM_MEMTYPE_FLAG_CMA;
 105                 break;
 106         case TTM_PL_VRAM:
 107                 /* "On-card" video ram */
 108                 man->func = &amdgpu_vram_mgr_func;
 109                 man->gpu_offset = adev->gmc.vram_start;
 110                 man->flags = TTM_MEMTYPE_FLAG_FIXED |
 111                              TTM_MEMTYPE_FLAG_MAPPABLE;
 112                 man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
 113                 man->default_caching = TTM_PL_FLAG_WC;
 114                 break;
 115         case AMDGPU_PL_GDS:
 116         case AMDGPU_PL_GWS:
 117         case AMDGPU_PL_OA:
 118                 /* On-chip GDS memory*/
 119                 man->func = &ttm_bo_manager_func;
 120                 man->gpu_offset = 0;
 121                 man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_CMA;
 122                 man->available_caching = TTM_PL_FLAG_UNCACHED;
 123                 man->default_caching = TTM_PL_FLAG_UNCACHED;
 124                 break;
 125         default:
 126                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 127                 return -EINVAL;
 128         }
 129         return 0;
 130 }
 131
 132 /**
 133  * amdgpu_evict_flags - Compute placement flags
 134  *
 135  * @bo: The buffer object to evict
 136  * @placement: Possible destination(s) for evicted BO
 137  *
 138  * Fill in placement data when ttm_bo_evict() is called
 139  */
 140 static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
 141                                 struct ttm_placement *placement)
 142 {
 143         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
 144         struct amdgpu_bo *abo;
 145         static const struct ttm_place placements = {
 146                 .fpfn = 0,
 147                 .lpfn = 0,
 148                 .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM
 149         };
 150
 151         /* Don't handle scatter gather BOs */
 152         if (bo->type == ttm_bo_type_sg) {
 153                 placement->num_placement = 0;
 154                 placement->num_busy_placement = 0;
 155                 return;
 156         }
 157
 158         /* Object isn't an AMDGPU object so ignore */
 159         if (!amdgpu_bo_is_amdgpu_bo(bo)) {
 160                 placement->placement = &placements;
 161                 placement->busy_placement = &placements;
 162                 placement->num_placement = 1;
 163                 placement->num_busy_placement = 1;
 164                 return;
 165         }
 166
 167         abo = ttm_to_amdgpu_bo(bo);
 168         switch (bo->mem.mem_type) {
 169         case AMDGPU_PL_GDS:
 170         case AMDGPU_PL_GWS:
 171         case AMDGPU_PL_OA:
 172                 placement->num_placement = 0;
 173                 placement->num_busy_placement = 0;
 174                 return;
 175
 176         case TTM_PL_VRAM:
 177                 if (!adev->mman.buffer_funcs_enabled) {
 178                         /* Move to system memory */
 179                         amdgpu_bo_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_CPU);
 180                 } else if (!amdgpu_gmc_vram_full_visible(&adev->gmc) &&
 181                            !(abo->flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED) &&
 182                            amdgpu_bo_in_cpu_visible_vram(abo)) {
 183
 184                         /* Try evicting to the CPU inaccessible part of VRAM
 185                          * first, but only set GTT as busy placement, so this
 186                          * BO will be evicted to GTT rather than causing other
 187                          * BOs to be evicted from VRAM
 188                          */
 189                         amdgpu_bo_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_VRAM |
 190                                                          AMDGPU_GEM_DOMAIN_GTT);
 191                         abo->placements[0].fpfn = adev->gmc.visible_vram_size >> PAGE_SHIFT;
 192                         abo->placements[0].lpfn = 0;
 193                         abo->placement.busy_placement = &abo->placements[1];
 194                         abo->placement.num_busy_placement = 1;
 195                 } else {
 196                         /* Move to GTT memory */
 197                         amdgpu_bo_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_GTT);
 198                 }
 199                 break;
 200         case TTM_PL_TT:
 201         default:
 202                 amdgpu_bo_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_CPU);
 203                 break;
 204         }
 205         *placement = abo->placement;
 206 }
 207
 208 /**
 209  * amdgpu_verify_access - Verify access for a mmap call
 210  *
 211  * @bo: The buffer object to map
 212  * @filp: The file pointer from the process performing the mmap
 213  *
 214  * This is called by ttm_bo_mmap() to verify whether a process
 215  * has the right to mmap a BO to their process space.
 216  */
 217 static int amdgpu_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 218 {
 219         struct amdgpu_bo *abo = ttm_to_amdgpu_bo(bo);
 220
 221         /*
 222          * Don't verify access for KFD BOs. They don't have a GEM
 223          * object associated with them.
 224          */
 225         if (abo->kfd_bo)
 226                 return 0;
 227
 228         if (amdgpu_ttm_tt_get_usermm(bo->ttm))
 229                 return -EPERM;
 230         return drm_vma_node_verify_access(&abo->tbo.base.vma_node,
 231                                           filp->private_data);
 232 }
 233
 234 /**
 235  * amdgpu_move_null - Register memory for a buffer object
 236  *
 237  * @bo: The bo to assign the memory to
 238  * @new_mem: The memory to be assigned.
 239  *
 240  * Assign the memory from new_mem to the memory of the buffer object bo.
 241  */
 242 static void amdgpu_move_null(struct ttm_buffer_object *bo,
 243                              struct ttm_mem_reg *new_mem)
 244 {
 245         struct ttm_mem_reg *old_mem = &bo->mem;
 246
 247         BUG_ON(old_mem->mm_node != NULL);
 248         *old_mem = *new_mem;
 249         new_mem->mm_node = NULL;
 250 }
 251
 252 /**
 253  * amdgpu_mm_node_addr - Compute the GPU relative offset of a GTT buffer.
 254  *
 255  * @bo: The bo to assign the memory to.
 256  * @mm_node: Memory manager node for drm allocator.
 257  * @mem: The region where the bo resides.
 258  *
 259  */
 260 static uint64_t amdgpu_mm_node_addr(struct ttm_buffer_object *bo,
 261                                     struct drm_mm_node *mm_node,
 262                                     struct ttm_mem_reg *mem)
 263 {
 264         uint64_t addr = 0;
 265
 266         if (mm_node->start != AMDGPU_BO_INVALID_OFFSET) {
 267                 addr = mm_node->start << PAGE_SHIFT;
 268                 addr += bo->bdev->man[mem->mem_type].gpu_offset;
 269         }
 270         return addr;
 271 }
 272
 273 /**
 274  * amdgpu_find_mm_node - Helper function finds the drm_mm_node corresponding to
 275  * @offset. It also modifies the offset to be within the drm_mm_node returned
 276  *
 277  * @mem: The region where the bo resides.
 278  * @offset: The offset that drm_mm_node is used for finding.
 279  *
 280  */
 281 static struct drm_mm_node *amdgpu_find_mm_node(struct ttm_mem_reg *mem,
 282                                                unsigned long *offset)
 283 {
 284         struct drm_mm_node *mm_node = mem->mm_node;
 285
 286         while (*offset >= (mm_node->size << PAGE_SHIFT)) {
 287                 *offset -= (mm_node->size << PAGE_SHIFT);
 288                 ++mm_node;
 289         }
 290         return mm_node;
 291 }
 292
 293 /**
 294  * amdgpu_copy_ttm_mem_to_mem - Helper function for copy
 295  *
 296  * The function copies @size bytes from {src->mem + src->offset} to
 297  * {dst->mem + dst->offset}. src->bo and dst->bo could be same BO for a
 298  * move and different for a BO to BO copy.
 299  *
 300  * @f: Returns the last fence if multiple jobs are submitted.
 301  */
 302 int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev,
 303                                struct amdgpu_copy_mem *src,
 304                                struct amdgpu_copy_mem *dst,
 305                                uint64_t size,
 306                                struct dma_resv *resv,
 307                                struct dma_fence **f)
 308 {
 309         struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
 310         struct drm_mm_node *src_mm, *dst_mm;
 311         uint64_t src_node_start, dst_node_start, src_node_size,
 312                  dst_node_size, src_page_offset, dst_page_offset;
 313         struct dma_fence *fence = NULL;
 314         int r = 0;
 315         const uint64_t GTT_MAX_BYTES = (AMDGPU_GTT_MAX_TRANSFER_SIZE *
 316                                         AMDGPU_GPU_PAGE_SIZE);
 317
 318         if (!adev->mman.buffer_funcs_enabled) {
 319                 DRM_ERROR("Trying to move memory with ring turned off.\n");
 320                 return -EINVAL;
 321         }
 322
 323         src_mm = amdgpu_find_mm_node(src->mem, &src->offset);
 324         src_node_start = amdgpu_mm_node_addr(src->bo, src_mm, src->mem) +
 325                                              src->offset;
 326         src_node_size = (src_mm->size << PAGE_SHIFT) - src->offset;
 327         src_page_offset = src_node_start & (PAGE_SIZE - 1);
 328
 329         dst_mm = amdgpu_find_mm_node(dst->mem, &dst->offset);
 330         dst_node_start = amdgpu_mm_node_addr(dst->bo, dst_mm, dst->mem) +
 331                                              dst->offset;
 332         dst_node_size = (dst_mm->size << PAGE_SHIFT) - dst->offset;
 333         dst_page_offset = dst_node_start & (PAGE_SIZE - 1);
 334
 335         mutex_lock(&adev->mman.gtt_window_lock);
 336
 337         while (size) {
 338                 unsigned long cur_size;
 339                 uint64_t from = src_node_start, to = dst_node_start;
 340                 struct dma_fence *next;
 341
 342                 /* Copy size cannot exceed GTT_MAX_BYTES. So if src or dst
 343                  * begins at an offset, then adjust the size accordingly
 344                  */
 345                 cur_size = min3(min(src_node_size, dst_node_size), size,
 346                                 GTT_MAX_BYTES);
 347                 if (cur_size + src_page_offset > GTT_MAX_BYTES ||
 348                     cur_size + dst_page_offset > GTT_MAX_BYTES)
 349                         cur_size -= max(src_page_offset, dst_page_offset);
 350
 351                 /* Map only what needs to be accessed. Map src to window 0 and
 352                  * dst to window 1
 353                  */
 354                 if (src->mem->start == AMDGPU_BO_INVALID_OFFSET) {
 355                         r = amdgpu_map_buffer(src->bo, src->mem,
 356                                         PFN_UP(cur_size + src_page_offset),
 357                                         src_node_start, 0, ring,
 358                                         &from);
 359                         if (r)
 360                                 goto error;
 361                         /* Adjust the offset because amdgpu_map_buffer returns
 362                          * start of mapped page
 363                          */
 364                         from += src_page_offset;
 365                 }
 366
 367                 if (dst->mem->start == AMDGPU_BO_INVALID_OFFSET) {
 368                         r = amdgpu_map_buffer(dst->bo, dst->mem,
 369                                         PFN_UP(cur_size + dst_page_offset),
 370                                         dst_node_start, 1, ring,
 371                                         &to);
 372                         if (r)
 373                                 goto error;
 374                         to += dst_page_offset;
 375                 }
 376
 377                 r = amdgpu_copy_buffer(ring, from, to, cur_size,
 378                                        resv, &next, false, true);
 379                 if (r)
 380                         goto error;
 381
 382                 dma_fence_put(fence);
 383                 fence = next;
 384
 385                 size -= cur_size;
 386                 if (!size)
 387                         break;
 388
 389                 src_node_size -= cur_size;
 390                 if (!src_node_size) {
 391                         src_node_start = amdgpu_mm_node_addr(src->bo, ++src_mm,
 392                                                              src->mem);
 393                         src_node_size = (src_mm->size << PAGE_SHIFT);
 394                         src_page_offset = 0;
 395                 } else {
 396                         src_node_start += cur_size;
 397                         src_page_offset = src_node_start & (PAGE_SIZE - 1);
 398                 }
 399                 dst_node_size -= cur_size;
 400                 if (!dst_node_size) {
 401                         dst_node_start = amdgpu_mm_node_addr(dst->bo, ++dst_mm,
 402                                                              dst->mem);
 403                         dst_node_size = (dst_mm->size << PAGE_SHIFT);
 404                         dst_page_offset = 0;
 405                 } else {
 406                         dst_node_start += cur_size;
 407                         dst_page_offset = dst_node_start & (PAGE_SIZE - 1);
 408                 }
 409         }
 410 error:
 411         mutex_unlock(&adev->mman.gtt_window_lock);
 412         if (f)
 413                 *f = dma_fence_get(fence);
 414         dma_fence_put(fence);
 415         return r;
 416 }
 417
 418 /**
 419  * amdgpu_move_blit - Copy an entire buffer to another buffer
 420  *
 421  * This is a helper called by amdgpu_bo_move() and amdgpu_move_vram_ram() to
 422  * help move buffers to and from VRAM.
 423  */
 424 static int amdgpu_move_blit(struct ttm_buffer_object *bo,
 425                             bool evict, bool no_wait_gpu,
 426                             struct ttm_mem_reg *new_mem,
 427                             struct ttm_mem_reg *old_mem)
 428 {
 429         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
 430         struct amdgpu_copy_mem src, dst;
 431         struct dma_fence *fence = NULL;
 432         int r;
 433
 434         src.bo = bo;
 435         dst.bo = bo;
 436         src.mem = old_mem;
 437         dst.mem = new_mem;
 438         src.offset = 0;
 439         dst.offset = 0;
 440
 441         r = amdgpu_ttm_copy_mem_to_mem(adev, &src, &dst,
 442                                        new_mem->num_pages << PAGE_SHIFT,
 443                                        bo->base.resv, &fence);
 444         if (r)
 445                 goto error;
 446
 447         /* clear the space being freed */
 448         if (old_mem->mem_type == TTM_PL_VRAM &&
 449             (ttm_to_amdgpu_bo(bo)->flags &
 450              AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE)) {
 451                 struct dma_fence *wipe_fence = NULL;
 452
 453                 r = amdgpu_fill_buffer(ttm_to_amdgpu_bo(bo), AMDGPU_POISON,
 454                                        NULL, &wipe_fence);
 455                 if (r) {
 456                         goto error;
 457                 } else if (wipe_fence) {
 458                         dma_fence_put(fence);
 459                         fence = wipe_fence;
 460                 }
 461         }
 462
 463         /* Always block for VM page tables before committing the new location */
 464         if (bo->type == ttm_bo_type_kernel)
 465                 r = ttm_bo_move_accel_cleanup(bo, fence, true, new_mem);
 466         else
 467                 r = ttm_bo_pipeline_move(bo, fence, evict, new_mem);
 468         dma_fence_put(fence);
 469         return r;
 470
 471 error:
 472         if (fence)
 473                 dma_fence_wait(fence, false);
 474         dma_fence_put(fence);
 475         return r;
 476 }
 477
 478 /**
 479  * amdgpu_move_vram_ram - Copy VRAM buffer to RAM buffer
 480  *
 481  * Called by amdgpu_bo_move().
 482  */
 483 static int amdgpu_move_vram_ram(struct ttm_buffer_object *bo, bool evict,
 484                                 struct ttm_operation_ctx *ctx,
 485                                 struct ttm_mem_reg *new_mem)
 486 {
 487         struct amdgpu_device *adev;
 488         struct ttm_mem_reg *old_mem = &bo->mem;
 489         struct ttm_mem_reg tmp_mem;
 490         struct ttm_place placements;
 491         struct ttm_placement placement;
 492         int r;
 493
 494         adev = amdgpu_ttm_adev(bo->bdev);
 495
 496         /* create space/pages for new_mem in GTT space */
 497         tmp_mem = *new_mem;
 498         tmp_mem.mm_node = NULL;
 499         placement.num_placement = 1;
 500         placement.placement = &placements;
 501         placement.num_busy_placement = 1;
 502         placement.busy_placement = &placements;
 503         placements.fpfn = 0;
 504         placements.lpfn = 0;
 505         placements.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT;
 506         r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx);
 507         if (unlikely(r)) {
 508                 pr_err("Failed to find GTT space for blit from VRAM\n");
 509                 return r;
 510         }
 511
 512         /* set caching flags */
 513         r = ttm_tt_set_placement_caching(bo->ttm, tmp_mem.placement);
 514         if (unlikely(r)) {
 515                 goto out_cleanup;
 516         }
 517
 518         /* Bind the memory to the GTT space */
 519         r = ttm_tt_bind(bo->ttm, &tmp_mem, ctx);
 520         if (unlikely(r)) {
 521                 goto out_cleanup;
 522         }
 523
 524         /* blit VRAM to GTT */
 525         r = amdgpu_move_blit(bo, evict, ctx->no_wait_gpu, &tmp_mem, old_mem);
 526         if (unlikely(r)) {
 527                 goto out_cleanup;
 528         }
 529
 530         /* move BO (in tmp_mem) to new_mem */
 531         r = ttm_bo_move_ttm(bo, ctx, new_mem);
 532 out_cleanup:
 533         ttm_bo_mem_put(bo, &tmp_mem);
 534         return r;
 535 }
 536
 537 /**
 538  * amdgpu_move_ram_vram - Copy buffer from RAM to VRAM
 539  *
 540  * Called by amdgpu_bo_move().
 541  */
 542 static int amdgpu_move_ram_vram(struct ttm_buffer_object *bo, bool evict,
 543                                 struct ttm_operation_ctx *ctx,
 544                                 struct ttm_mem_reg *new_mem)
 545 {
 546         struct amdgpu_device *adev;
 547         struct ttm_mem_reg *old_mem = &bo->mem;
 548         struct ttm_mem_reg tmp_mem;
 549         struct ttm_placement placement;
 550         struct ttm_place placements;
 551         int r;
 552
 553         adev = amdgpu_ttm_adev(bo->bdev);
 554
 555         /* make space in GTT for old_mem buffer */
 556         tmp_mem = *new_mem;
 557         tmp_mem.mm_node = NULL;
 558         placement.num_placement = 1;
 559         placement.placement = &placements;
 560         placement.num_busy_placement = 1;
 561         placement.busy_placement = &placements;
 562         placements.fpfn = 0;
 563         placements.lpfn = 0;
 564         placements.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT;
 565         r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx);
 566         if (unlikely(r)) {
 567                 pr_err("Failed to find GTT space for blit to VRAM\n");
 568                 return r;
 569         }
 570
 571         /* move/bind old memory to GTT space */
 572         r = ttm_bo_move_ttm(bo, ctx, &tmp_mem);
 573         if (unlikely(r)) {
 574                 goto out_cleanup;
 575         }
 576
 577         /* copy to VRAM */
 578         r = amdgpu_move_blit(bo, evict, ctx->no_wait_gpu, new_mem, old_mem);
 579         if (unlikely(r)) {
 580                 goto out_cleanup;
 581         }
 582 out_cleanup:
 583         ttm_bo_mem_put(bo, &tmp_mem);
 584         return r;
 585 }
 586
 587 /**
 588  * amdgpu_mem_visible - Check that memory can be accessed by ttm_bo_move_memcpy
 589  *
 590  * Called by amdgpu_bo_move()
 591  */
 592 static bool amdgpu_mem_visible(struct amdgpu_device *adev,
 593                                struct ttm_mem_reg *mem)
 594 {
 595         struct drm_mm_node *nodes = mem->mm_node;
 596
 597         if (mem->mem_type == TTM_PL_SYSTEM ||
 598             mem->mem_type == TTM_PL_TT)
 599                 return true;
 600         if (mem->mem_type != TTM_PL_VRAM)
 601                 return false;
 602
 603         /* ttm_mem_reg_ioremap only supports contiguous memory */
 604         if (nodes->size != mem->num_pages)
 605                 return false;
 606
 607         return ((nodes->start + nodes->size) << PAGE_SHIFT)
 608                 <= adev->gmc.visible_vram_size;
 609 }
 610
 611 /**
 612  * amdgpu_bo_move - Move a buffer object to a new memory location
 613  *
 614  * Called by ttm_bo_handle_move_mem()
 615  */
 616 static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
 617                           struct ttm_operation_ctx *ctx,
 618                           struct ttm_mem_reg *new_mem)
 619 {
 620         struct amdgpu_device *adev;
 621         struct amdgpu_bo *abo;
 622         struct ttm_mem_reg *old_mem = &bo->mem;
 623         int r;
 624
 625         /* Can't move a pinned BO */
 626         abo = ttm_to_amdgpu_bo(bo);
 627         if (WARN_ON_ONCE(abo->pin_count > 0))
 628                 return -EINVAL;
 629
 630         adev = amdgpu_ttm_adev(bo->bdev);
 631
 632         if (old_mem->mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
 633                 amdgpu_move_null(bo, new_mem);
 634                 return 0;
 635         }
 636         if ((old_mem->mem_type == TTM_PL_TT &&
 637              new_mem->mem_type == TTM_PL_SYSTEM) ||
 638             (old_mem->mem_type == TTM_PL_SYSTEM &&
 639              new_mem->mem_type == TTM_PL_TT)) {
 640                 /* bind is enough */
 641                 amdgpu_move_null(bo, new_mem);
 642                 return 0;
 643         }
 644         if (old_mem->mem_type == AMDGPU_PL_GDS ||
 645             old_mem->mem_type == AMDGPU_PL_GWS ||
 646             old_mem->mem_type == AMDGPU_PL_OA ||
 647             new_mem->mem_type == AMDGPU_PL_GDS ||
 648             new_mem->mem_type == AMDGPU_PL_GWS ||
 649             new_mem->mem_type == AMDGPU_PL_OA) {
 650                 /* Nothing to save here */
 651                 amdgpu_move_null(bo, new_mem);
 652                 return 0;
 653         }
 654
 655         if (!adev->mman.buffer_funcs_enabled) {
 656                 r = -ENODEV;
 657                 goto memcpy;
 658         }
 659
 660         if (old_mem->mem_type == TTM_PL_VRAM &&
 661             new_mem->mem_type == TTM_PL_SYSTEM) {
 662                 r = amdgpu_move_vram_ram(bo, evict, ctx, new_mem);
 663         } else if (old_mem->mem_type == TTM_PL_SYSTEM &&
 664                    new_mem->mem_type == TTM_PL_VRAM) {
 665                 r = amdgpu_move_ram_vram(bo, evict, ctx, new_mem);
 666         } else {
 667                 r = amdgpu_move_blit(bo, evict, ctx->no_wait_gpu,
 668                                      new_mem, old_mem);
 669         }
 670
 671         if (r) {
 672 memcpy:
 673                 /* Check that all memory is CPU accessible */
 674                 if (!amdgpu_mem_visible(adev, old_mem) ||
 675                     !amdgpu_mem_visible(adev, new_mem)) {
 676                         pr_err("Move buffer fallback to memcpy unavailable\n");
 677                         return r;
 678                 }
 679
 680                 r = ttm_bo_move_memcpy(bo, ctx, new_mem);
 681                 if (r)
 682                         return r;
 683         }
 684
 685         if (bo->type == ttm_bo_type_device &&
 686             new_mem->mem_type == TTM_PL_VRAM &&
 687             old_mem->mem_type != TTM_PL_VRAM) {
 688                 /* amdgpu_bo_fault_reserve_notify will re-set this if the CPU
 689                  * accesses the BO after it's moved.
 690                  */
 691                 abo->flags &= ~AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
 692         }
 693
 694         /* update statistics */
 695         atomic64_add((u64)bo->num_pages << PAGE_SHIFT, &adev->num_bytes_moved);
 696         return 0;
 697 }
 698
 699 /**
 700  * amdgpu_ttm_io_mem_reserve - Reserve a block of memory during a fault
 701  *
 702  * Called by ttm_mem_io_reserve() ultimately via ttm_bo_vm_fault()
 703  */
 704 static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 705 {
 706         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 707         struct amdgpu_device *adev = amdgpu_ttm_adev(bdev);
 708         struct drm_mm_node *mm_node = mem->mm_node;
 709
 710         mem->bus.addr = NULL;
 711         mem->bus.offset = 0;
 712         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 713         mem->bus.base = 0;
 714         mem->bus.is_iomem = false;
 715         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 716                 return -EINVAL;
 717         switch (mem->mem_type) {
 718         case TTM_PL_SYSTEM:
 719                 /* system memory */
 720                 return 0;
 721         case TTM_PL_TT:
 722                 break;
 723         case TTM_PL_VRAM:
 724                 mem->bus.offset = mem->start << PAGE_SHIFT;
 725                 /* check if it's visible */
 726                 if ((mem->bus.offset + mem->bus.size) > adev->gmc.visible_vram_size)
 727                         return -EINVAL;
 728                 /* Only physically contiguous buffers apply. In a contiguous
 729                  * buffer, size of the first mm_node would match the number of
 730                  * pages in ttm_mem_reg.
 731                  */
 732                 if (adev->mman.aper_base_kaddr &&
 733                     (mm_node->size == mem->num_pages))
 734                         mem->bus.addr = (u8 *)adev->mman.aper_base_kaddr +
 735                                         mem->bus.offset;
 736
 737                 mem->bus.base = adev->gmc.aper_base;
 738                 mem->bus.is_iomem = true;
 739                 break;
 740         default:
 741                 return -EINVAL;
 742         }
 743         return 0;
 744 }
 745
 746 static void amdgpu_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 747 {
 748 }
 749
 750 static unsigned long amdgpu_ttm_io_mem_pfn(struct ttm_buffer_object *bo,
 751                                            unsigned long page_offset)
 752 {
 753         struct drm_mm_node *mm;
 754         unsigned long offset = (page_offset << PAGE_SHIFT);
 755
 756         mm = amdgpu_find_mm_node(&bo->mem, &offset);
 757         return (bo->mem.bus.base >> PAGE_SHIFT) + mm->start +
 758                 (offset >> PAGE_SHIFT);
 759 }
 760
 761 /*
 762  * TTM backend functions.
 763  */
 764 struct amdgpu_ttm_tt {
 765         struct ttm_dma_tt       ttm;
 766         u64                     offset;
 767         uint64_t                userptr;
 768         struct task_struct      *usertask;
 769         uint32_t                userflags;
 770 #if IS_ENABLED(CONFIG_DRM_AMDGPU_USERPTR)
 771         struct hmm_range        *range;
 772 #endif
 773 };
 774
 775 /**
 776  * amdgpu_ttm_tt_get_user_pages - get device accessible pages that back user
 777  * memory and start HMM tracking CPU page table update
 778  *
 779  * Calling function must call amdgpu_ttm_tt_userptr_range_done() once and only
 780  * once afterwards to stop HMM tracking
 781  */
 782 #if IS_ENABLED(CONFIG_DRM_AMDGPU_USERPTR)
 783
 784 #define MAX_RETRY_HMM_RANGE_FAULT       16
 785
 786 int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages)
 787 {
 788         struct hmm_mirror *mirror = bo->mn ? &bo->mn->mirror : NULL;
 789         struct ttm_tt *ttm = bo->tbo.ttm;
 790         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 791         struct mm_struct *mm = gtt->usertask->mm;
 792         unsigned long start = gtt->userptr;
 793         struct vm_area_struct *vma;
 794         struct hmm_range *range;
 795         unsigned long i;
 796         uint64_t *pfns;
 797         int r = 0;
 798
 799         if (!mm) /* Happens during process shutdown */
 800                 return -ESRCH;
 801
 802         if (unlikely(!mirror)) {
 803                 DRM_DEBUG_DRIVER("Failed to get hmm_mirror\n");
 804                 r = -EFAULT;
 805                 goto out;
 806         }
 807
 808         vma = find_vma(mm, start);
 809         if (unlikely(!vma || start < vma->vm_start)) {
 810                 r = -EFAULT;
 811                 goto out;
 812         }
 813         if (unlikely((gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) &&
 814                 vma->vm_file)) {
 815                 r = -EPERM;
 816                 goto out;
 817         }
 818
 819         range = kzalloc(sizeof(*range), GFP_KERNEL);
 820         if (unlikely(!range)) {
 821                 r = -ENOMEM;
 822                 goto out;
 823         }
 824
 825         pfns = kvmalloc_array(ttm->num_pages, sizeof(*pfns), GFP_KERNEL);
 826         if (unlikely(!pfns)) {
 827                 r = -ENOMEM;
 828                 goto out_free_ranges;
 829         }
 830
 831         amdgpu_hmm_init_range(range);
 832         range->default_flags = range->flags[HMM_PFN_VALID];
 833         range->default_flags |= amdgpu_ttm_tt_is_readonly(ttm) ?
 834                                 0 : range->flags[HMM_PFN_WRITE];
 835         range->pfn_flags_mask = 0;
 836         range->pfns = pfns;
 837         range->start = start;
 838         range->end = start + ttm->num_pages * PAGE_SIZE;
 839
 840         hmm_range_register(range, mirror);
 841
 842         /*
 843          * Just wait for range to be valid, safe to ignore return value as we
 844          * will use the return value of hmm_range_fault() below under the
 845          * mmap_sem to ascertain the validity of the range.
 846          */
 847         hmm_range_wait_until_valid(range, HMM_RANGE_DEFAULT_TIMEOUT);
 848
 849         down_read(&mm->mmap_sem);
 850         r = hmm_range_fault(range, 0);
 851         up_read(&mm->mmap_sem);
 852
 853         if (unlikely(r < 0))
 854                 goto out_free_pfns;
 855
 856         for (i = 0; i < ttm->num_pages; i++) {
 857                 pages[i] = hmm_device_entry_to_page(range, pfns[i]);
 858                 if (unlikely(!pages[i])) {
 859                         pr_err("Page fault failed for pfn[%lu] = 0x%llx\n",
 860                                i, pfns[i]);
 861                         r = -ENOMEM;
 862
 863                         goto out_free_pfns;
 864                 }
 865         }
 866
 867         gtt->range = range;
 868
 869         return 0;
 870
 871 out_free_pfns:
 872         hmm_range_unregister(range);
 873         kvfree(pfns);
 874 out_free_ranges:
 875         kfree(range);
 876 out:
 877         return r;
 878 }
 879
 880 /**
 881  * amdgpu_ttm_tt_userptr_range_done - stop HMM track the CPU page table change
 882  * Check if the pages backing this ttm range have been invalidated
 883  *
 884  * Returns: true if pages are still valid
 885  */
 886 bool amdgpu_ttm_tt_get_user_pages_done(struct ttm_tt *ttm)
 887 {
 888         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 889         bool r = false;
 890
 891         if (!gtt || !gtt->userptr)
 892                 return false;
 893
 894         DRM_DEBUG_DRIVER("user_pages_done 0x%llx pages 0x%lx\n",
 895                 gtt->userptr, ttm->num_pages);
 896
 897         WARN_ONCE(!gtt->range || !gtt->range->pfns,
 898                 "No user pages to check\n");
 899
 900         if (gtt->range) {
 901                 r = hmm_range_valid(gtt->range);
 902                 hmm_range_unregister(gtt->range);
 903
 904                 kvfree(gtt->range->pfns);
 905                 kfree(gtt->range);
 906                 gtt->range = NULL;
 907         }
 908
 909         return r;
 910 }
 911 #endif
 912
 913 /**
 914  * amdgpu_ttm_tt_set_user_pages - Copy pages in, putting old pages as necessary.
 915  *
 916  * Called by amdgpu_cs_list_validate(). This creates the page list
 917  * that backs user memory and will ultimately be mapped into the device
 918  * address space.
 919  */
 920 void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct page **pages)
 921 {
 922         unsigned long i;
 923
 924         for (i = 0; i < ttm->num_pages; ++i)
 925                 ttm->pages[i] = pages ? pages[i] : NULL;
 926 }
 927
 928 /**
 929  * amdgpu_ttm_tt_pin_userptr -  prepare the sg table with the user pages
 930  *
 931  * Called by amdgpu_ttm_backend_bind()
 932  **/
 933 static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt *ttm)
 934 {
 935         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
 936         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 937         unsigned nents;
 938         int r;
 939
 940         int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
 941         enum dma_data_direction direction = write ?
 942                 DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 943
 944         /* Allocate an SG array and squash pages into it */
 945         r = sg_alloc_table_from_pages(ttm->sg, ttm->pages, ttm->num_pages, 0,
 946                                       ttm->num_pages << PAGE_SHIFT,
 947                                       GFP_KERNEL);
 948         if (r)
 949                 goto release_sg;
 950
 951         /* Map SG to device */
 952         r = -ENOMEM;
 953         nents = dma_map_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
 954         if (nents != ttm->sg->nents)
 955                 goto release_sg;
 956
 957         /* convert SG to linear array of pages and dma addresses */
 958         drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
 959                                          gtt->ttm.dma_address, ttm->num_pages);
 960
 961         return 0;
 962
 963 release_sg:
 964         kfree(ttm->sg);
 965         return r;
 966 }
 967
 968 /**
 969  * amdgpu_ttm_tt_unpin_userptr - Unpin and unmap userptr pages
 970  */
 971 static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
 972 {
 973         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
 974         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 975
 976         int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
 977         enum dma_data_direction direction = write ?
 978                 DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 979
 980         /* double check that we don't free the table twice */
 981         if (!ttm->sg->sgl)
 982                 return;
 983
 984         /* unmap the pages mapped to the device */
 985         dma_unmap_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
 986
 987         sg_free_table(ttm->sg);
 988
 989 #if IS_ENABLED(CONFIG_DRM_AMDGPU_USERPTR)
 990         if (gtt->range &&
 991             ttm->pages[0] == hmm_device_entry_to_page(gtt->range,
 992                                                       gtt->range->pfns[0]))
 993                 WARN_ONCE(1, "Missing get_user_page_done\n");
 994 #endif
 995 }
 996
 997 int amdgpu_ttm_gart_bind(struct amdgpu_device *adev,
 998                                 struct ttm_buffer_object *tbo,
 999                                 uint64_t flags)
1000 {
1001         struct amdgpu_bo *abo = ttm_to_amdgpu_bo(tbo);
1002         struct ttm_tt *ttm = tbo->ttm;
1003         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1004         int r;
1005
1006         if (abo->flags & AMDGPU_GEM_CREATE_MQD_GFX9) {
1007                 uint64_t page_idx = 1;
1008
1009                 r = amdgpu_gart_bind(adev, gtt->offset, page_idx,
1010                                 ttm->pages, gtt->ttm.dma_address, flags);
1011                 if (r)
1012                         goto gart_bind_fail;
1013
1014                 /* Patch mtype of the second part BO */
1015                 flags &= ~AMDGPU_PTE_MTYPE_VG10_MASK;
1016                 flags |= AMDGPU_PTE_MTYPE_VG10(AMDGPU_MTYPE_NC);
1017
1018                 r = amdgpu_gart_bind(adev,
1019                                 gtt->offset + (page_idx << PAGE_SHIFT),
1020                                 ttm->num_pages - page_idx,
1021                                 &ttm->pages[page_idx],
1022                                 &(gtt->ttm.dma_address[page_idx]), flags);
1023         } else {
1024                 r = amdgpu_gart_bind(adev, gtt->offset, ttm->num_pages,
1025                                      ttm->pages, gtt->ttm.dma_address, flags);
1026         }
1027
1028 gart_bind_fail:
1029         if (r)
1030                 DRM_ERROR("failed to bind %lu pages at 0x%08llX\n",
1031                           ttm->num_pages, gtt->offset);
1032
1033         return r;
1034 }
1035
1036 /**
1037  * amdgpu_ttm_backend_bind - Bind GTT memory
1038  *
1039  * Called by ttm_tt_bind() on behalf of ttm_bo_handle_move_mem().
1040  * This handles binding GTT memory to the device address space.
1041  */
1042 static int amdgpu_ttm_backend_bind(struct ttm_tt *ttm,
1043                                    struct ttm_mem_reg *bo_mem)
1044 {
1045         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
1046         struct amdgpu_ttm_tt *gtt = (void*)ttm;
1047         uint64_t flags;
1048         int r = 0;
1049
1050         if (gtt->userptr) {
1051                 r = amdgpu_ttm_tt_pin_userptr(ttm);
1052                 if (r) {
1053                         DRM_ERROR("failed to pin userptr\n");
1054                         return r;
1055                 }
1056         }
1057         if (!ttm->num_pages) {
1058                 WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
1059                      ttm->num_pages, bo_mem, ttm);
1060         }
1061
1062         if (bo_mem->mem_type == AMDGPU_PL_GDS ||
1063             bo_mem->mem_type == AMDGPU_PL_GWS ||
1064             bo_mem->mem_type == AMDGPU_PL_OA)
1065                 return -EINVAL;
1066
1067         if (!amdgpu_gtt_mgr_has_gart_addr(bo_mem)) {
1068                 gtt->offset = AMDGPU_BO_INVALID_OFFSET;
1069                 return 0;
1070         }
1071
1072         /* compute PTE flags relevant to this BO memory */
1073         flags = amdgpu_ttm_tt_pte_flags(adev, ttm, bo_mem);
1074
1075         /* bind pages into GART page tables */
1076         gtt->offset = (u64)bo_mem->start << PAGE_SHIFT;
1077         r = amdgpu_gart_bind(adev, gtt->offset, ttm->num_pages,
1078                 ttm->pages, gtt->ttm.dma_address, flags);
1079
1080         if (r)
1081                 DRM_ERROR("failed to bind %lu pages at 0x%08llX\n",
1082                           ttm->num_pages, gtt->offset);
1083         return r;
1084 }
1085
1086 /**
1087  * amdgpu_ttm_alloc_gart - Allocate GART memory for buffer object
1088  */
1089 int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
1090 {
1091         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
1092         struct ttm_operation_ctx ctx = { false, false };
1093         struct amdgpu_ttm_tt *gtt = (void*)bo->ttm;
1094         struct ttm_mem_reg tmp;
1095         struct ttm_placement placement;
1096         struct ttm_place placements;
1097         uint64_t addr, flags;
1098         int r;
1099
1100         if (bo->mem.start != AMDGPU_BO_INVALID_OFFSET)
1101                 return 0;
1102
1103         addr = amdgpu_gmc_agp_addr(bo);
1104         if (addr != AMDGPU_BO_INVALID_OFFSET) {
1105                 bo->mem.start = addr >> PAGE_SHIFT;
1106         } else {
1107
1108                 /* allocate GART space */
1109                 tmp = bo->mem;
1110                 tmp.mm_node = NULL;
1111                 placement.num_placement = 1;
1112                 placement.placement = &placements;
1113                 placement.num_busy_placement = 1;
1114                 placement.busy_placement = &placements;
1115                 placements.fpfn = 0;
1116                 placements.lpfn = adev->gmc.gart_size >> PAGE_SHIFT;
1117                 placements.flags = (bo->mem.placement & ~TTM_PL_MASK_MEM) |
1118                         TTM_PL_FLAG_TT;
1119
1120                 r = ttm_bo_mem_space(bo, &placement, &tmp, &ctx);
1121                 if (unlikely(r))
1122                         return r;
1123
1124                 /* compute PTE flags for this buffer object */
1125                 flags = amdgpu_ttm_tt_pte_flags(adev, bo->ttm, &tmp);
1126
1127                 /* Bind pages */
1128                 gtt->offset = (u64)tmp.start << PAGE_SHIFT;
1129                 r = amdgpu_ttm_gart_bind(adev, bo, flags);
1130                 if (unlikely(r)) {
1131                         ttm_bo_mem_put(bo, &tmp);
1132                         return r;
1133                 }
1134
1135                 ttm_bo_mem_put(bo, &bo->mem);
1136                 bo->mem = tmp;
1137         }
1138
1139         bo->offset = (bo->mem.start << PAGE_SHIFT) +
1140                 bo->bdev->man[bo->mem.mem_type].gpu_offset;
1141
1142         return 0;
1143 }
1144
1145 /**
1146  * amdgpu_ttm_recover_gart - Rebind GTT pages
1147  *
1148  * Called by amdgpu_gtt_mgr_recover() from amdgpu_device_reset() to
1149  * rebind GTT pages during a GPU reset.
1150  */
1151 int amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo)
1152 {
1153         struct amdgpu_device *adev = amdgpu_ttm_adev(tbo->bdev);
1154         uint64_t flags;
1155         int r;
1156
1157         if (!tbo->ttm)
1158                 return 0;
1159
1160         flags = amdgpu_ttm_tt_pte_flags(adev, tbo->ttm, &tbo->mem);
1161         r = amdgpu_ttm_gart_bind(adev, tbo, flags);
1162
1163         return r;
1164 }
1165
1166 /**
1167  * amdgpu_ttm_backend_unbind - Unbind GTT mapped pages
1168  *
1169  * Called by ttm_tt_unbind() on behalf of ttm_bo_move_ttm() and
1170  * ttm_tt_destroy().
1171  */
1172 static int amdgpu_ttm_backend_unbind(struct ttm_tt *ttm)
1173 {
1174         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
1175         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1176         int r;
1177
1178         /* if the pages have userptr pinning then clear that first */
1179         if (gtt->userptr)
1180                 amdgpu_ttm_tt_unpin_userptr(ttm);
1181
1182         if (gtt->offset == AMDGPU_BO_INVALID_OFFSET)
1183                 return 0;
1184
1185         /* unbind shouldn't be done for GDS/GWS/OA in ttm_bo_clean_mm */
1186         r = amdgpu_gart_unbind(adev, gtt->offset, ttm->num_pages);
1187         if (r)
1188                 DRM_ERROR("failed to unbind %lu pages at 0x%08llX\n",
1189                           gtt->ttm.ttm.num_pages, gtt->offset);
1190         return r;
1191 }
1192
1193 static void amdgpu_ttm_backend_destroy(struct ttm_tt *ttm)
1194 {
1195         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1196
1197         if (gtt->usertask)
1198                 put_task_struct(gtt->usertask);
1199
1200         ttm_dma_tt_fini(&gtt->ttm);
1201         kfree(gtt);
1202 }
1203
1204 static struct ttm_backend_func amdgpu_backend_func = {
1205         .bind = &amdgpu_ttm_backend_bind,
1206         .unbind = &amdgpu_ttm_backend_unbind,
1207         .destroy = &amdgpu_ttm_backend_destroy,
1208 };
1209
1210 /**
1211  * amdgpu_ttm_tt_create - Create a ttm_tt object for a given BO
1212  *
1213  * @bo: The buffer object to create a GTT ttm_tt object around
1214  *
1215  * Called by ttm_tt_create().
1216  */
1217 static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_buffer_object *bo,
1218                                            uint32_t page_flags)
1219 {
1220         struct amdgpu_device *adev;
1221         struct amdgpu_ttm_tt *gtt;
1222
1223         adev = amdgpu_ttm_adev(bo->bdev);
1224
1225         gtt = kzalloc(sizeof(struct amdgpu_ttm_tt), GFP_KERNEL);
1226         if (gtt == NULL) {
1227                 return NULL;
1228         }
1229         gtt->ttm.ttm.func = &amdgpu_backend_func;
1230
1231         /* allocate space for the uninitialized page entries */
1232         if (ttm_sg_tt_init(&gtt->ttm, bo, page_flags)) {
1233                 kfree(gtt);
1234                 return NULL;
1235         }
1236         return &gtt->ttm.ttm;
1237 }
1238
1239 /**
1240  * amdgpu_ttm_tt_populate - Map GTT pages visible to the device
1241  *
1242  * Map the pages of a ttm_tt object to an address space visible
1243  * to the underlying device.
1244  */
1245 static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm,
1246                         struct ttm_operation_ctx *ctx)
1247 {
1248         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
1249         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1250         bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
1251
1252         /* user pages are bound by amdgpu_ttm_tt_pin_userptr() */
1253         if (gtt && gtt->userptr) {
1254                 ttm->sg = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
1255                 if (!ttm->sg)
1256                         return -ENOMEM;
1257
1258                 ttm->page_flags |= TTM_PAGE_FLAG_SG;
1259                 ttm->state = tt_unbound;
1260                 return 0;
1261         }
1262
1263         if (slave && ttm->sg) {
1264                 drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
1265                                                  gtt->ttm.dma_address,
1266                                                  ttm->num_pages);
1267                 ttm->state = tt_unbound;
1268                 return 0;
1269         }
1270
1271 #ifdef CONFIG_SWIOTLB
1272         if (adev->need_swiotlb && swiotlb_nr_tbl()) {
1273                 return ttm_dma_populate(&gtt->ttm, adev->dev, ctx);
1274         }
1275 #endif
1276
1277         /* fall back to generic helper to populate the page array
1278          * and map them to the device */
1279         return ttm_populate_and_map_pages(adev->dev, &gtt->ttm, ctx);
1280 }
1281
1282 /**
1283  * amdgpu_ttm_tt_unpopulate - unmap GTT pages and unpopulate page arrays
1284  *
1285  * Unmaps pages of a ttm_tt object from the device address space and
1286  * unpopulates the page array backing it.
1287  */
1288 static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
1289 {
1290         struct amdgpu_device *adev;
1291         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1292         bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
1293
1294         if (gtt && gtt->userptr) {
1295                 amdgpu_ttm_tt_set_user_pages(ttm, NULL);
1296                 kfree(ttm->sg);
1297                 ttm->page_flags &= ~TTM_PAGE_FLAG_SG;
1298                 return;
1299         }
1300
1301         if (slave)
1302                 return;
1303
1304         adev = amdgpu_ttm_adev(ttm->bdev);
1305
1306 #ifdef CONFIG_SWIOTLB
1307         if (adev->need_swiotlb && swiotlb_nr_tbl()) {
1308                 ttm_dma_unpopulate(&gtt->ttm, adev->dev);
1309                 return;
1310         }
1311 #endif
1312
1313         /* fall back to generic helper to unmap and unpopulate array */
1314         ttm_unmap_and_unpopulate_pages(adev->dev, &gtt->ttm);
1315 }
1316
1317 /**
1318  * amdgpu_ttm_tt_set_userptr - Initialize userptr GTT ttm_tt for the current
1319  * task
1320  *
1321  * @ttm: The ttm_tt object to bind this userptr object to
1322  * @addr:  The address in the current tasks VM space to use
1323  * @flags: Requirements of userptr object.
1324  *
1325  * Called by amdgpu_gem_userptr_ioctl() to bind userptr pages
1326  * to current task
1327  */
1328 int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr,
1329                               uint32_t flags)
1330 {
1331         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1332
1333         if (gtt == NULL)
1334                 return -EINVAL;
1335
1336         gtt->userptr = addr;
1337         gtt->userflags = flags;
1338
1339         if (gtt->usertask)
1340                 put_task_struct(gtt->usertask);
1341         gtt->usertask = current->group_leader;
1342         get_task_struct(gtt->usertask);
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 inside an
1365  * address range for the current task.
1366  *
1367  */
1368 bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
1369                                   unsigned long end)
1370 {
1371         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1372         unsigned long size;
1373
1374         if (gtt == NULL || !gtt->userptr)
1375                 return false;
1376
1377         /* Return false if no part of the ttm_tt object lies within
1378          * the range
1379          */
1380         size = (unsigned long)gtt->ttm.ttm.num_pages * PAGE_SIZE;
1381         if (gtt->userptr > end || gtt->userptr + size <= start)
1382                 return false;
1383
1384         return true;
1385 }
1386
1387 /**
1388  * amdgpu_ttm_tt_is_userptr - Have the pages backing by userptr?
1389  */
1390 bool amdgpu_ttm_tt_is_userptr(struct ttm_tt *ttm)
1391 {
1392         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1393
1394         if (gtt == NULL || !gtt->userptr)
1395                 return false;
1396
1397         return true;
1398 }
1399
1400 /**
1401  * amdgpu_ttm_tt_is_readonly - Is the ttm_tt object read only?
1402  */
1403 bool amdgpu_ttm_tt_is_readonly(struct ttm_tt *ttm)
1404 {
1405         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1406
1407         if (gtt == NULL)
1408                 return false;
1409
1410         return !!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
1411 }
1412
1413 /**
1414  * amdgpu_ttm_tt_pde_flags - Compute PDE flags for ttm_tt object
1415  *
1416  * @ttm: The ttm_tt object to compute the flags for
1417  * @mem: The memory registry backing this ttm_tt object
1418  *
1419  * Figure out the flags to use for a VM PDE (Page Directory Entry).
1420  */
1421 uint64_t amdgpu_ttm_tt_pde_flags(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
1422 {
1423         uint64_t flags = 0;
1424
1425         if (mem && mem->mem_type != TTM_PL_SYSTEM)
1426                 flags |= AMDGPU_PTE_VALID;
1427
1428         if (mem && mem->mem_type == TTM_PL_TT) {
1429                 flags |= AMDGPU_PTE_SYSTEM;
1430
1431                 if (ttm->caching_state == tt_cached)
1432                         flags |= AMDGPU_PTE_SNOOPED;
1433         }
1434
1435         return flags;
1436 }
1437
1438 /**
1439  * amdgpu_ttm_tt_pte_flags - Compute PTE flags for ttm_tt object
1440  *
1441  * @ttm: The ttm_tt object to compute the flags for
1442  * @mem: The memory registry backing this ttm_tt object
1443
1444  * Figure out the flags to use for a VM PTE (Page Table Entry).
1445  */
1446 uint64_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
1447                                  struct ttm_mem_reg *mem)
1448 {
1449         uint64_t flags = amdgpu_ttm_tt_pde_flags(ttm, mem);
1450
1451         flags |= adev->gart.gart_pte_flags;
1452         flags |= AMDGPU_PTE_READABLE;
1453
1454         if (!amdgpu_ttm_tt_is_readonly(ttm))
1455                 flags |= AMDGPU_PTE_WRITEABLE;
1456
1457         return flags;
1458 }
1459
1460 /**
1461  * amdgpu_ttm_bo_eviction_valuable - Check to see if we can evict a buffer
1462  * object.
1463  *
1464  * Return true if eviction is sensible. Called by ttm_mem_evict_first() on
1465  * behalf of ttm_bo_mem_force_space() which tries to evict buffer objects until
1466  * it can find space for a new object and by ttm_bo_force_list_clean() which is
1467  * used to clean out a memory space.
1468  */
1469 static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
1470                                             const struct ttm_place *place)
1471 {
1472         unsigned long num_pages = bo->mem.num_pages;
1473         struct drm_mm_node *node = bo->mem.mm_node;
1474         struct dma_resv_list *flist;
1475         struct dma_fence *f;
1476         int i;
1477
1478         /* Don't evict VM page tables while they are busy, otherwise we can't
1479          * cleanly handle page faults.
1480          */
1481         if (bo->type == ttm_bo_type_kernel &&
1482             !dma_resv_test_signaled_rcu(bo->base.resv, true))
1483                 return false;
1484
1485         /* If bo is a KFD BO, check if the bo belongs to the current process.
1486          * If true, then return false as any KFD process needs all its BOs to
1487          * be resident to run successfully
1488          */
1489         flist = dma_resv_get_list(bo->base.resv);
1490         if (flist) {
1491                 for (i = 0; i < flist->shared_count; ++i) {
1492                         f = rcu_dereference_protected(flist->shared[i],
1493                                 dma_resv_held(bo->base.resv));
1494                         if (amdkfd_fence_check_mm(f, current->mm))
1495                                 return false;
1496                 }
1497         }
1498
1499         switch (bo->mem.mem_type) {
1500         case TTM_PL_TT:
1501                 return true;
1502
1503         case TTM_PL_VRAM:
1504                 /* Check each drm MM node individually */
1505                 while (num_pages) {
1506                         if (place->fpfn < (node->start + node->size) &&
1507                             !(place->lpfn && place->lpfn <= node->start))
1508                                 return true;
1509
1510                         num_pages -= node->size;
1511                         ++node;
1512                 }
1513                 return false;
1514
1515         default:
1516                 break;
1517         }
1518
1519         return ttm_bo_eviction_valuable(bo, place);
1520 }
1521
1522 /**
1523  * amdgpu_ttm_access_memory - Read or Write memory that backs a buffer object.
1524  *
1525  * @bo:  The buffer object to read/write
1526  * @offset:  Offset into buffer object
1527  * @buf:  Secondary buffer to write/read from
1528  * @len: Length in bytes of access
1529  * @write:  true if writing
1530  *
1531  * This is used to access VRAM that backs a buffer object via MMIO
1532  * access for debugging purposes.
1533  */
1534 static int amdgpu_ttm_access_memory(struct ttm_buffer_object *bo,
1535                                     unsigned long offset,
1536                                     void *buf, int len, int write)
1537 {
1538         struct amdgpu_bo *abo = ttm_to_amdgpu_bo(bo);
1539         struct amdgpu_device *adev = amdgpu_ttm_adev(abo->tbo.bdev);
1540         struct drm_mm_node *nodes;
1541         uint32_t value = 0;
1542         int ret = 0;
1543         uint64_t pos;
1544         unsigned long flags;
1545
1546         if (bo->mem.mem_type != TTM_PL_VRAM)
1547                 return -EIO;
1548
1549         nodes = amdgpu_find_mm_node(&abo->tbo.mem, &offset);
1550         pos = (nodes->start << PAGE_SHIFT) + offset;
1551
1552         while (len && pos < adev->gmc.mc_vram_size) {
1553                 uint64_t aligned_pos = pos & ~(uint64_t)3;
1554                 uint32_t bytes = 4 - (pos & 3);
1555                 uint32_t shift = (pos & 3) * 8;
1556                 uint32_t mask = 0xffffffff << shift;
1557
1558                 if (len < bytes) {
1559                         mask &= 0xffffffff >> (bytes - len) * 8;
1560                         bytes = len;
1561                 }
1562
1563                 spin_lock_irqsave(&adev->mmio_idx_lock, flags);
1564                 WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)aligned_pos) | 0x80000000);
1565                 WREG32_NO_KIQ(mmMM_INDEX_HI, aligned_pos >> 31);
1566                 if (!write || mask != 0xffffffff)
1567                         value = RREG32_NO_KIQ(mmMM_DATA);
1568                 if (write) {
1569                         value &= ~mask;
1570                         value |= (*(uint32_t *)buf << shift) & mask;
1571                         WREG32_NO_KIQ(mmMM_DATA, value);
1572                 }
1573                 spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
1574                 if (!write) {
1575                         value = (value & mask) >> shift;
1576                         memcpy(buf, &value, bytes);
1577                 }
1578
1579                 ret += bytes;
1580                 buf = (uint8_t *)buf + bytes;
1581                 pos += bytes;
1582                 len -= bytes;
1583                 if (pos >= (nodes->start + nodes->size) << PAGE_SHIFT) {
1584                         ++nodes;
1585                         pos = (nodes->start << PAGE_SHIFT);
1586                 }
1587         }
1588
1589         return ret;
1590 }
1591
1592 static struct ttm_bo_driver amdgpu_bo_driver = {
1593         .ttm_tt_create = &amdgpu_ttm_tt_create,
1594         .ttm_tt_populate = &amdgpu_ttm_tt_populate,
1595         .ttm_tt_unpopulate = &amdgpu_ttm_tt_unpopulate,
1596         .invalidate_caches = &amdgpu_invalidate_caches,
1597         .init_mem_type = &amdgpu_init_mem_type,
1598         .eviction_valuable = amdgpu_ttm_bo_eviction_valuable,
1599         .evict_flags = &amdgpu_evict_flags,
1600         .move = &amdgpu_bo_move,
1601         .verify_access = &amdgpu_verify_access,
1602         .move_notify = &amdgpu_bo_move_notify,
1603         .release_notify = &amdgpu_bo_release_notify,
1604         .fault_reserve_notify = &amdgpu_bo_fault_reserve_notify,
1605         .io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
1606         .io_mem_free = &amdgpu_ttm_io_mem_free,
1607         .io_mem_pfn = amdgpu_ttm_io_mem_pfn,
1608         .access_memory = &amdgpu_ttm_access_memory,
1609         .del_from_lru_notify = &amdgpu_vm_del_from_lru_notify
1610 };
1611
1612 /*
1613  * Firmware Reservation functions
1614  */
1615 /**
1616  * amdgpu_ttm_fw_reserve_vram_fini - free fw reserved vram
1617  *
1618  * @adev: amdgpu_device pointer
1619  *
1620  * free fw reserved vram if it has been reserved.
1621  */
1622 static void amdgpu_ttm_fw_reserve_vram_fini(struct amdgpu_device *adev)
1623 {
1624         amdgpu_bo_free_kernel(&adev->fw_vram_usage.reserved_bo,
1625                 NULL, &adev->fw_vram_usage.va);
1626 }
1627
1628 /**
1629  * amdgpu_ttm_fw_reserve_vram_init - create bo vram reservation from fw
1630  *
1631  * @adev: amdgpu_device pointer
1632  *
1633  * create bo vram reservation from fw.
1634  */
1635 static int amdgpu_ttm_fw_reserve_vram_init(struct amdgpu_device *adev)
1636 {
1637         struct ttm_operation_ctx ctx = { false, false };
1638         struct amdgpu_bo_param bp;
1639         int r = 0;
1640         int i;
1641         u64 vram_size = adev->gmc.visible_vram_size;
1642         u64 offset = adev->fw_vram_usage.start_offset;
1643         u64 size = adev->fw_vram_usage.size;
1644         struct amdgpu_bo *bo;
1645
1646         memset(&bp, 0, sizeof(bp));
1647         bp.size = adev->fw_vram_usage.size;
1648         bp.byte_align = PAGE_SIZE;
1649         bp.domain = AMDGPU_GEM_DOMAIN_VRAM;
1650         bp.flags = AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
1651                 AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
1652         bp.type = ttm_bo_type_kernel;
1653         bp.resv = NULL;
1654         adev->fw_vram_usage.va = NULL;
1655         adev->fw_vram_usage.reserved_bo = NULL;
1656
1657         if (adev->fw_vram_usage.size > 0 &&
1658                 adev->fw_vram_usage.size <= vram_size) {
1659
1660                 r = amdgpu_bo_create(adev, &bp,
1661                                      &adev->fw_vram_usage.reserved_bo);
1662                 if (r)
1663                         goto error_create;
1664
1665                 r = amdgpu_bo_reserve(adev->fw_vram_usage.reserved_bo, false);
1666                 if (r)
1667                         goto error_reserve;
1668
1669                 /* remove the original mem node and create a new one at the
1670                  * request position
1671                  */
1672                 bo = adev->fw_vram_usage.reserved_bo;
1673                 offset = ALIGN(offset, PAGE_SIZE);
1674                 for (i = 0; i < bo->placement.num_placement; ++i) {
1675                         bo->placements[i].fpfn = offset >> PAGE_SHIFT;
1676                         bo->placements[i].lpfn = (offset + size) >> PAGE_SHIFT;
1677                 }
1678
1679                 ttm_bo_mem_put(&bo->tbo, &bo->tbo.mem);
1680                 r = ttm_bo_mem_space(&bo->tbo, &bo->placement,
1681                                      &bo->tbo.mem, &ctx);
1682                 if (r)
1683                         goto error_pin;
1684
1685                 r = amdgpu_bo_pin_restricted(adev->fw_vram_usage.reserved_bo,
1686                         AMDGPU_GEM_DOMAIN_VRAM,
1687                         adev->fw_vram_usage.start_offset,
1688                         (adev->fw_vram_usage.start_offset +
1689                         adev->fw_vram_usage.size));
1690                 if (r)
1691                         goto error_pin;
1692                 r = amdgpu_bo_kmap(adev->fw_vram_usage.reserved_bo,
1693                         &adev->fw_vram_usage.va);
1694                 if (r)
1695                         goto error_kmap;
1696
1697                 amdgpu_bo_unreserve(adev->fw_vram_usage.reserved_bo);
1698         }
1699         return r;
1700
1701 error_kmap:
1702         amdgpu_bo_unpin(adev->fw_vram_usage.reserved_bo);
1703 error_pin:
1704         amdgpu_bo_unreserve(adev->fw_vram_usage.reserved_bo);
1705 error_reserve:
1706         amdgpu_bo_unref(&adev->fw_vram_usage.reserved_bo);
1707 error_create:
1708         adev->fw_vram_usage.va = NULL;
1709         adev->fw_vram_usage.reserved_bo = NULL;
1710         return r;
1711 }
1712 /**
1713  * amdgpu_ttm_init - Init the memory management (ttm) as well as various
1714  * gtt/vram related fields.
1715  *
1716  * This initializes all of the memory space pools that the TTM layer
1717  * will need such as the GTT space (system memory mapped to the device),
1718  * VRAM (on-board memory), and on-chip memories (GDS, GWS, OA) which
1719  * can be mapped per VMID.
1720  */
1721 int amdgpu_ttm_init(struct amdgpu_device *adev)
1722 {
1723         uint64_t gtt_size;
1724         int r;
1725         u64 vis_vram_limit;
1726         void *stolen_vga_buf;
1727
1728         mutex_init(&adev->mman.gtt_window_lock);
1729
1730         /* No others user of address space so set it to 0 */
1731         r = ttm_bo_device_init(&adev->mman.bdev,
1732                                &amdgpu_bo_driver,
1733                                adev->ddev->anon_inode->i_mapping,
1734                                adev->ddev->vma_offset_manager,
1735                                dma_addressing_limited(adev->dev));
1736         if (r) {
1737                 DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
1738                 return r;
1739         }
1740         adev->mman.initialized = true;
1741
1742         /* We opt to avoid OOM on system pages allocations */
1743         adev->mman.bdev.no_retry = true;
1744
1745         /* Initialize VRAM pool with all of VRAM divided into pages */
1746         r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_VRAM,
1747                                 adev->gmc.real_vram_size >> PAGE_SHIFT);
1748         if (r) {
1749                 DRM_ERROR("Failed initializing VRAM heap.\n");
1750                 return r;
1751         }
1752
1753         /* Reduce size of CPU-visible VRAM if requested */
1754         vis_vram_limit = (u64)amdgpu_vis_vram_limit * 1024 * 1024;
1755         if (amdgpu_vis_vram_limit > 0 &&
1756             vis_vram_limit <= adev->gmc.visible_vram_size)
1757                 adev->gmc.visible_vram_size = vis_vram_limit;
1758
1759         /* Change the size here instead of the init above so only lpfn is affected */
1760         amdgpu_ttm_set_buffer_funcs_status(adev, false);
1761 #ifdef CONFIG_64BIT
1762         adev->mman.aper_base_kaddr = ioremap_wc(adev->gmc.aper_base,
1763                                                 adev->gmc.visible_vram_size);
1764 #endif
1765
1766         /*
1767          *The reserved vram for firmware must be pinned to the specified
1768          *place on the VRAM, so reserve it early.
1769          */
1770         r = amdgpu_ttm_fw_reserve_vram_init(adev);
1771         if (r) {
1772                 return r;
1773         }
1774
1775         /* allocate memory as required for VGA
1776          * This is used for VGA emulation and pre-OS scanout buffers to
1777          * avoid display artifacts while transitioning between pre-OS
1778          * and driver.  */
1779         r = amdgpu_bo_create_kernel(adev, adev->gmc.stolen_size, PAGE_SIZE,
1780                                     AMDGPU_GEM_DOMAIN_VRAM,
1781                                     &adev->stolen_vga_memory,
1782                                     NULL, &stolen_vga_buf);
1783         if (r)
1784                 return r;
1785         DRM_INFO("amdgpu: %uM of VRAM memory ready\n",
1786                  (unsigned) (adev->gmc.real_vram_size / (1024 * 1024)));
1787
1788         /* Compute GTT size, either bsaed on 3/4th the size of RAM size
1789          * or whatever the user passed on module init */
1790         if (amdgpu_gtt_size == -1) {
1791                 struct sysinfo si;
1792
1793                 si_meminfo(&si);
1794                 gtt_size = min(max((AMDGPU_DEFAULT_GTT_SIZE_MB << 20),
1795                                adev->gmc.mc_vram_size),
1796                                ((uint64_t)si.totalram * si.mem_unit * 3/4));
1797         }
1798         else
1799                 gtt_size = (uint64_t)amdgpu_gtt_size << 20;
1800
1801         /* Initialize GTT memory pool */
1802         r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_TT, gtt_size >> PAGE_SHIFT);
1803         if (r) {
1804                 DRM_ERROR("Failed initializing GTT heap.\n");
1805                 return r;
1806         }
1807         DRM_INFO("amdgpu: %uM of GTT memory ready.\n",
1808                  (unsigned)(gtt_size / (1024 * 1024)));
1809
1810         /* Initialize various on-chip memory pools */
1811         r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_GDS,
1812                            adev->gds.gds_size);
1813         if (r) {
1814                 DRM_ERROR("Failed initializing GDS heap.\n");
1815                 return r;
1816         }
1817
1818         r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_GWS,
1819                            adev->gds.gws_size);
1820         if (r) {
1821                 DRM_ERROR("Failed initializing gws heap.\n");
1822                 return r;
1823         }
1824
1825         r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_OA,
1826                            adev->gds.oa_size);
1827         if (r) {
1828                 DRM_ERROR("Failed initializing oa heap.\n");
1829                 return r;
1830         }
1831
1832         /* Register debugfs entries for amdgpu_ttm */
1833         r = amdgpu_ttm_debugfs_init(adev);
1834         if (r) {
1835                 DRM_ERROR("Failed to init debugfs\n");
1836                 return r;
1837         }
1838         return 0;
1839 }
1840
1841 /**
1842  * amdgpu_ttm_late_init - Handle any late initialization for amdgpu_ttm
1843  */
1844 void amdgpu_ttm_late_init(struct amdgpu_device *adev)
1845 {
1846         void *stolen_vga_buf;
1847         /* return the VGA stolen memory (if any) back to VRAM */
1848         amdgpu_bo_free_kernel(&adev->stolen_vga_memory, NULL, &stolen_vga_buf);
1849 }
1850
1851 /**
1852  * amdgpu_ttm_fini - De-initialize the TTM memory pools
1853  */
1854 void amdgpu_ttm_fini(struct amdgpu_device *adev)
1855 {
1856         if (!adev->mman.initialized)
1857                 return;
1858
1859         amdgpu_ttm_debugfs_fini(adev);
1860         amdgpu_ttm_fw_reserve_vram_fini(adev);
1861         if (adev->mman.aper_base_kaddr)
1862                 iounmap(adev->mman.aper_base_kaddr);
1863         adev->mman.aper_base_kaddr = NULL;
1864
1865         ttm_bo_clean_mm(&adev->mman.bdev, TTM_PL_VRAM);
1866         ttm_bo_clean_mm(&adev->mman.bdev, TTM_PL_TT);
1867         ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_GDS);
1868         ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_GWS);
1869         ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_OA);
1870         ttm_bo_device_release(&adev->mman.bdev);
1871         adev->mman.initialized = false;
1872         DRM_INFO("amdgpu: ttm finalized\n");
1873 }
1874
1875 /**
1876  * amdgpu_ttm_set_buffer_funcs_status - enable/disable use of buffer functions
1877  *
1878  * @adev: amdgpu_device pointer
1879  * @enable: true when we can use buffer functions.
1880  *
1881  * Enable/disable use of buffer functions during suspend/resume. This should
1882  * only be called at bootup or when userspace isn't running.
1883  */
1884 void amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable)
1885 {
1886         struct ttm_mem_type_manager *man = &adev->mman.bdev.man[TTM_PL_VRAM];
1887         uint64_t size;
1888         int r;
1889
1890         if (!adev->mman.initialized || adev->in_gpu_reset ||
1891             adev->mman.buffer_funcs_enabled == enable)
1892                 return;
1893
1894         if (enable) {
1895                 struct amdgpu_ring *ring;
1896                 struct drm_sched_rq *rq;
1897
1898                 ring = adev->mman.buffer_funcs_ring;
1899                 rq = &ring->sched.sched_rq[DRM_SCHED_PRIORITY_KERNEL];
1900                 r = drm_sched_entity_init(&adev->mman.entity, &rq, 1, NULL);
1901                 if (r) {
1902                         DRM_ERROR("Failed setting up TTM BO move entity (%d)\n",
1903                                   r);
1904                         return;
1905                 }
1906         } else {
1907                 drm_sched_entity_destroy(&adev->mman.entity);
1908                 dma_fence_put(man->move);
1909                 man->move = NULL;
1910         }
1911
1912         /* this just adjusts TTM size idea, which sets lpfn to the correct value */
1913         if (enable)
1914                 size = adev->gmc.real_vram_size;
1915         else
1916                 size = adev->gmc.visible_vram_size;
1917         man->size = size >> PAGE_SHIFT;
1918         adev->mman.buffer_funcs_enabled = enable;
1919 }
1920
1921 int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma)
1922 {
1923         struct drm_file *file_priv = filp->private_data;
1924         struct amdgpu_device *adev = file_priv->minor->dev->dev_private;
1925
1926         if (adev == NULL)
1927                 return -EINVAL;
1928
1929         return ttm_bo_mmap(filp, vma, &adev->mman.bdev);
1930 }
1931
1932 static int amdgpu_map_buffer(struct ttm_buffer_object *bo,
1933                              struct ttm_mem_reg *mem, unsigned num_pages,
1934                              uint64_t offset, unsigned window,
1935                              struct amdgpu_ring *ring,
1936                              uint64_t *addr)
1937 {
1938         struct amdgpu_ttm_tt *gtt = (void *)bo->ttm;
1939         struct amdgpu_device *adev = ring->adev;
1940         struct ttm_tt *ttm = bo->ttm;
1941         struct amdgpu_job *job;
1942         unsigned num_dw, num_bytes;
1943         dma_addr_t *dma_address;
1944         struct dma_fence *fence;
1945         uint64_t src_addr, dst_addr;
1946         uint64_t flags;
1947         int r;
1948
1949         BUG_ON(adev->mman.buffer_funcs->copy_max_bytes <
1950                AMDGPU_GTT_MAX_TRANSFER_SIZE * 8);
1951
1952         *addr = adev->gmc.gart_start;
1953         *addr += (u64)window * AMDGPU_GTT_MAX_TRANSFER_SIZE *
1954                 AMDGPU_GPU_PAGE_SIZE;
1955
1956         num_dw = adev->mman.buffer_funcs->copy_num_dw;
1957         while (num_dw & 0x7)
1958                 num_dw++;
1959
1960         num_bytes = num_pages * 8;
1961
1962         r = amdgpu_job_alloc_with_ib(adev, num_dw * 4 + num_bytes, &job);
1963         if (r)
1964                 return r;
1965
1966         src_addr = num_dw * 4;
1967         src_addr += job->ibs[0].gpu_addr;
1968
1969         dst_addr = amdgpu_bo_gpu_offset(adev->gart.bo);
1970         dst_addr += window * AMDGPU_GTT_MAX_TRANSFER_SIZE * 8;
1971         amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_addr,
1972                                 dst_addr, num_bytes);
1973
1974         amdgpu_ring_pad_ib(ring, &job->ibs[0]);
1975         WARN_ON(job->ibs[0].length_dw > num_dw);
1976
1977         dma_address = &gtt->ttm.dma_address[offset >> PAGE_SHIFT];
1978         flags = amdgpu_ttm_tt_pte_flags(adev, ttm, mem);
1979         r = amdgpu_gart_map(adev, 0, num_pages, dma_address, flags,
1980                             &job->ibs[0].ptr[num_dw]);
1981         if (r)
1982                 goto error_free;
1983
1984         r = amdgpu_job_submit(job, &adev->mman.entity,
1985                               AMDGPU_FENCE_OWNER_UNDEFINED, &fence);
1986         if (r)
1987                 goto error_free;
1988
1989         dma_fence_put(fence);
1990
1991         return r;
1992
1993 error_free:
1994         amdgpu_job_free(job);
1995         return r;
1996 }
1997
1998 int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
1999                        uint64_t dst_offset, uint32_t byte_count,
2000                        struct dma_resv *resv,
2001                        struct dma_fence **fence, bool direct_submit,
2002                        bool vm_needs_flush)
2003 {
2004         struct amdgpu_device *adev = ring->adev;
2005         struct amdgpu_job *job;
2006
2007         uint32_t max_bytes;
2008         unsigned num_loops, num_dw;
2009         unsigned i;
2010         int r;
2011
2012         if (direct_submit && !ring->sched.ready) {
2013                 DRM_ERROR("Trying to move memory with ring turned off.\n");
2014                 return -EINVAL;
2015         }
2016
2017         max_bytes = adev->mman.buffer_funcs->copy_max_bytes;
2018         num_loops = DIV_ROUND_UP(byte_count, max_bytes);
2019         num_dw = num_loops * adev->mman.buffer_funcs->copy_num_dw;
2020
2021         /* for IB padding */
2022         while (num_dw & 0x7)
2023                 num_dw++;
2024
2025         r = amdgpu_job_alloc_with_ib(adev, num_dw * 4, &job);
2026         if (r)
2027                 return r;
2028
2029         if (vm_needs_flush) {
2030                 job->vm_pd_addr = amdgpu_gmc_pd_addr(adev->gart.bo);
2031                 job->vm_needs_flush = true;
2032         }
2033         if (resv) {
2034                 r = amdgpu_sync_resv(adev, &job->sync, resv,
2035                                      AMDGPU_FENCE_OWNER_UNDEFINED,
2036                                      false);
2037                 if (r) {
2038                         DRM_ERROR("sync failed (%d).\n", r);
2039                         goto error_free;
2040                 }
2041         }
2042
2043         for (i = 0; i < num_loops; i++) {
2044                 uint32_t cur_size_in_bytes = min(byte_count, max_bytes);
2045
2046                 amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_offset,
2047                                         dst_offset, cur_size_in_bytes);
2048
2049                 src_offset += cur_size_in_bytes;
2050                 dst_offset += cur_size_in_bytes;
2051                 byte_count -= cur_size_in_bytes;
2052         }
2053
2054         amdgpu_ring_pad_ib(ring, &job->ibs[0]);
2055         WARN_ON(job->ibs[0].length_dw > num_dw);
2056         if (direct_submit)
2057                 r = amdgpu_job_submit_direct(job, ring, fence);
2058         else
2059                 r = amdgpu_job_submit(job, &adev->mman.entity,
2060                                       AMDGPU_FENCE_OWNER_UNDEFINED, fence);
2061         if (r)
2062                 goto error_free;
2063
2064         return r;
2065
2066 error_free:
2067         amdgpu_job_free(job);
2068         DRM_ERROR("Error scheduling IBs (%d)\n", r);
2069         return r;
2070 }
2071
2072 int amdgpu_fill_buffer(struct amdgpu_bo *bo,
2073                        uint32_t src_data,
2074                        struct dma_resv *resv,
2075                        struct dma_fence **fence)
2076 {
2077         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
2078         uint32_t max_bytes = adev->mman.buffer_funcs->fill_max_bytes;
2079         struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
2080
2081         struct drm_mm_node *mm_node;
2082         unsigned long num_pages;
2083         unsigned int num_loops, num_dw;
2084
2085         struct amdgpu_job *job;
2086         int r;
2087
2088         if (!adev->mman.buffer_funcs_enabled) {
2089                 DRM_ERROR("Trying to clear memory with ring turned off.\n");
2090                 return -EINVAL;
2091         }
2092
2093         if (bo->tbo.mem.mem_type == TTM_PL_TT) {
2094                 r = amdgpu_ttm_alloc_gart(&bo->tbo);
2095                 if (r)
2096                         return r;
2097         }
2098
2099         num_pages = bo->tbo.num_pages;
2100         mm_node = bo->tbo.mem.mm_node;
2101         num_loops = 0;
2102         while (num_pages) {
2103                 uint64_t byte_count = mm_node->size << PAGE_SHIFT;
2104
2105                 num_loops += DIV_ROUND_UP_ULL(byte_count, max_bytes);
2106                 num_pages -= mm_node->size;
2107                 ++mm_node;
2108         }
2109         num_dw = num_loops * adev->mman.buffer_funcs->fill_num_dw;
2110
2111         /* for IB padding */
2112         num_dw += 64;
2113
2114         r = amdgpu_job_alloc_with_ib(adev, num_dw * 4, &job);
2115         if (r)
2116                 return r;
2117
2118         if (resv) {
2119                 r = amdgpu_sync_resv(adev, &job->sync, resv,
2120                                      AMDGPU_FENCE_OWNER_UNDEFINED, false);
2121                 if (r) {
2122                         DRM_ERROR("sync failed (%d).\n", r);
2123                         goto error_free;
2124                 }
2125         }
2126
2127         num_pages = bo->tbo.num_pages;
2128         mm_node = bo->tbo.mem.mm_node;
2129
2130         while (num_pages) {
2131                 uint64_t byte_count = mm_node->size << PAGE_SHIFT;
2132                 uint64_t dst_addr;
2133
2134                 dst_addr = amdgpu_mm_node_addr(&bo->tbo, mm_node, &bo->tbo.mem);
2135                 while (byte_count) {
2136                         uint32_t cur_size_in_bytes = min_t(uint64_t, byte_count,
2137                                                            max_bytes);
2138
2139                         amdgpu_emit_fill_buffer(adev, &job->ibs[0], src_data,
2140                                                 dst_addr, cur_size_in_bytes);
2141
2142                         dst_addr += cur_size_in_bytes;
2143                         byte_count -= cur_size_in_bytes;
2144                 }
2145
2146                 num_pages -= mm_node->size;
2147                 ++mm_node;
2148         }
2149
2150         amdgpu_ring_pad_ib(ring, &job->ibs[0]);
2151         WARN_ON(job->ibs[0].length_dw > num_dw);
2152         r = amdgpu_job_submit(job, &adev->mman.entity,
2153                               AMDGPU_FENCE_OWNER_UNDEFINED, fence);
2154         if (r)
2155                 goto error_free;
2156
2157         return 0;
2158
2159 error_free:
2160         amdgpu_job_free(job);
2161         return r;
2162 }
2163
2164 #if defined(CONFIG_DEBUG_FS)
2165
2166 static int amdgpu_mm_dump_table(struct seq_file *m, void *data)
2167 {
2168         struct drm_info_node *node = (struct drm_info_node *)m->private;
2169         unsigned ttm_pl = (uintptr_t)node->info_ent->data;
2170         struct drm_device *dev = node->minor->dev;
2171         struct amdgpu_device *adev = dev->dev_private;
2172         struct ttm_mem_type_manager *man = &adev->mman.bdev.man[ttm_pl];
2173         struct drm_printer p = drm_seq_file_printer(m);
2174
2175         man->func->debug(man, &p);
2176         return 0;
2177 }
2178
2179 static const struct drm_info_list amdgpu_ttm_debugfs_list[] = {
2180         {"amdgpu_vram_mm", amdgpu_mm_dump_table, 0, (void *)TTM_PL_VRAM},
2181         {"amdgpu_gtt_mm", amdgpu_mm_dump_table, 0, (void *)TTM_PL_TT},
2182         {"amdgpu_gds_mm", amdgpu_mm_dump_table, 0, (void *)AMDGPU_PL_GDS},
2183         {"amdgpu_gws_mm", amdgpu_mm_dump_table, 0, (void *)AMDGPU_PL_GWS},
2184         {"amdgpu_oa_mm", amdgpu_mm_dump_table, 0, (void *)AMDGPU_PL_OA},
2185         {"ttm_page_pool", ttm_page_alloc_debugfs, 0, NULL},
2186 #ifdef CONFIG_SWIOTLB
2187         {"ttm_dma_page_pool", ttm_dma_page_alloc_debugfs, 0, NULL}
2188 #endif
2189 };
2190
2191 /**
2192  * amdgpu_ttm_vram_read - Linear read access to VRAM
2193  *
2194  * Accesses VRAM via MMIO for debugging purposes.
2195  */
2196 static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf,
2197                                     size_t size, loff_t *pos)
2198 {
2199         struct amdgpu_device *adev = file_inode(f)->i_private;
2200         ssize_t result = 0;
2201         int r;
2202
2203         if (size & 0x3 || *pos & 0x3)
2204                 return -EINVAL;
2205
2206         if (*pos >= adev->gmc.mc_vram_size)
2207                 return -ENXIO;
2208
2209         while (size) {
2210                 unsigned long flags;
2211                 uint32_t value;
2212
2213                 if (*pos >= adev->gmc.mc_vram_size)
2214                         return result;
2215
2216                 spin_lock_irqsave(&adev->mmio_idx_lock, flags);
2217                 WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)*pos) | 0x80000000);
2218                 WREG32_NO_KIQ(mmMM_INDEX_HI, *pos >> 31);
2219                 value = RREG32_NO_KIQ(mmMM_DATA);
2220                 spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
2221
2222                 r = put_user(value, (uint32_t *)buf);
2223                 if (r)
2224                         return r;
2225
2226                 result += 4;
2227                 buf += 4;
2228                 *pos += 4;
2229                 size -= 4;
2230         }
2231
2232         return result;
2233 }
2234
2235 /**
2236  * amdgpu_ttm_vram_write - Linear write access to VRAM
2237  *
2238  * Accesses VRAM via MMIO for debugging purposes.
2239  */
2240 static ssize_t amdgpu_ttm_vram_write(struct file *f, const char __user *buf,
2241                                     size_t size, loff_t *pos)
2242 {
2243         struct amdgpu_device *adev = file_inode(f)->i_private;
2244         ssize_t result = 0;
2245         int r;
2246
2247         if (size & 0x3 || *pos & 0x3)
2248                 return -EINVAL;
2249
2250         if (*pos >= adev->gmc.mc_vram_size)
2251                 return -ENXIO;
2252
2253         while (size) {
2254                 unsigned long flags;
2255                 uint32_t value;
2256
2257                 if (*pos >= adev->gmc.mc_vram_size)
2258                         return result;
2259
2260                 r = get_user(value, (uint32_t *)buf);
2261                 if (r)
2262                         return r;
2263
2264                 spin_lock_irqsave(&adev->mmio_idx_lock, flags);
2265                 WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)*pos) | 0x80000000);
2266                 WREG32_NO_KIQ(mmMM_INDEX_HI, *pos >> 31);
2267                 WREG32_NO_KIQ(mmMM_DATA, value);
2268                 spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
2269
2270                 result += 4;
2271                 buf += 4;
2272                 *pos += 4;
2273                 size -= 4;
2274         }
2275
2276         return result;
2277 }
2278
2279 static const struct file_operations amdgpu_ttm_vram_fops = {
2280         .owner = THIS_MODULE,
2281         .read = amdgpu_ttm_vram_read,
2282         .write = amdgpu_ttm_vram_write,
2283         .llseek = default_llseek,
2284 };
2285
2286 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
2287
2288 /**
2289  * amdgpu_ttm_gtt_read - Linear read access to GTT memory
2290  */
2291 static ssize_t amdgpu_ttm_gtt_read(struct file *f, char __user *buf,
2292                                    size_t size, loff_t *pos)
2293 {
2294         struct amdgpu_device *adev = file_inode(f)->i_private;
2295         ssize_t result = 0;
2296         int r;
2297
2298         while (size) {
2299                 loff_t p = *pos / PAGE_SIZE;
2300                 unsigned off = *pos & ~PAGE_MASK;
2301                 size_t cur_size = min_t(size_t, size, PAGE_SIZE - off);
2302                 struct page *page;
2303                 void *ptr;
2304
2305                 if (p >= adev->gart.num_cpu_pages)
2306                         return result;
2307
2308                 page = adev->gart.pages[p];
2309                 if (page) {
2310                         ptr = kmap(page);
2311                         ptr += off;
2312
2313                         r = copy_to_user(buf, ptr, cur_size);
2314                         kunmap(adev->gart.pages[p]);
2315                 } else
2316                         r = clear_user(buf, cur_size);
2317
2318                 if (r)
2319                         return -EFAULT;
2320
2321                 result += cur_size;
2322                 buf += cur_size;
2323                 *pos += cur_size;
2324                 size -= cur_size;
2325         }
2326
2327         return result;
2328 }
2329
2330 static const struct file_operations amdgpu_ttm_gtt_fops = {
2331         .owner = THIS_MODULE,
2332         .read = amdgpu_ttm_gtt_read,
2333         .llseek = default_llseek
2334 };
2335
2336 #endif
2337
2338 /**
2339  * amdgpu_iomem_read - Virtual read access to GPU mapped memory
2340  *
2341  * This function is used to read memory that has been mapped to the
2342  * GPU and the known addresses are not physical addresses but instead
2343  * bus addresses (e.g., what you'd put in an IB or ring buffer).
2344  */
2345 static ssize_t amdgpu_iomem_read(struct file *f, char __user *buf,
2346                                  size_t size, loff_t *pos)
2347 {
2348         struct amdgpu_device *adev = file_inode(f)->i_private;
2349         struct iommu_domain *dom;
2350         ssize_t result = 0;
2351         int r;
2352
2353         /* retrieve the IOMMU domain if any for this device */
2354         dom = iommu_get_domain_for_dev(adev->dev);
2355
2356         while (size) {
2357                 phys_addr_t addr = *pos & PAGE_MASK;
2358                 loff_t off = *pos & ~PAGE_MASK;
2359                 size_t bytes = PAGE_SIZE - off;
2360                 unsigned long pfn;
2361                 struct page *p;
2362                 void *ptr;
2363
2364                 bytes = bytes < size ? bytes : size;
2365
2366                 /* Translate the bus address to a physical address.  If
2367                  * the domain is NULL it means there is no IOMMU active
2368                  * and the address translation is the identity
2369                  */
2370                 addr = dom ? iommu_iova_to_phys(dom, addr) : addr;
2371
2372                 pfn = addr >> PAGE_SHIFT;
2373                 if (!pfn_valid(pfn))
2374                         return -EPERM;
2375
2376                 p = pfn_to_page(pfn);
2377                 if (p->mapping != adev->mman.bdev.dev_mapping)
2378                         return -EPERM;
2379
2380                 ptr = kmap(p);
2381                 r = copy_to_user(buf, ptr + off, bytes);
2382                 kunmap(p);
2383                 if (r)
2384                         return -EFAULT;
2385
2386                 size -= bytes;
2387                 *pos += bytes;
2388                 result += bytes;
2389         }
2390
2391         return result;
2392 }
2393
2394 /**
2395  * amdgpu_iomem_write - Virtual write access to GPU mapped memory
2396  *
2397  * This function is used to write memory that has been mapped to the
2398  * GPU and the known addresses are not physical addresses but instead
2399  * bus addresses (e.g., what you'd put in an IB or ring buffer).
2400  */
2401 static ssize_t amdgpu_iomem_write(struct file *f, const char __user *buf,
2402                                  size_t size, loff_t *pos)
2403 {
2404         struct amdgpu_device *adev = file_inode(f)->i_private;
2405         struct iommu_domain *dom;
2406         ssize_t result = 0;
2407         int r;
2408
2409         dom = iommu_get_domain_for_dev(adev->dev);
2410
2411         while (size) {
2412                 phys_addr_t addr = *pos & PAGE_MASK;
2413                 loff_t off = *pos & ~PAGE_MASK;
2414                 size_t bytes = PAGE_SIZE - off;
2415                 unsigned long pfn;
2416                 struct page *p;
2417                 void *ptr;
2418
2419                 bytes = bytes < size ? bytes : size;
2420
2421                 addr = dom ? iommu_iova_to_phys(dom, addr) : addr;
2422
2423                 pfn = addr >> PAGE_SHIFT;
2424                 if (!pfn_valid(pfn))
2425                         return -EPERM;
2426
2427                 p = pfn_to_page(pfn);
2428                 if (p->mapping != adev->mman.bdev.dev_mapping)
2429                         return -EPERM;
2430
2431                 ptr = kmap(p);
2432                 r = copy_from_user(ptr + off, buf, bytes);
2433                 kunmap(p);
2434                 if (r)
2435                         return -EFAULT;
2436
2437                 size -= bytes;
2438                 *pos += bytes;
2439                 result += bytes;
2440         }
2441
2442         return result;
2443 }
2444
2445 static const struct file_operations amdgpu_ttm_iomem_fops = {
2446         .owner = THIS_MODULE,
2447         .read = amdgpu_iomem_read,
2448         .write = amdgpu_iomem_write,
2449         .llseek = default_llseek
2450 };
2451
2452 static const struct {
2453         char *name;
2454         const struct file_operations *fops;
2455         int domain;
2456 } ttm_debugfs_entries[] = {
2457         { "amdgpu_vram", &amdgpu_ttm_vram_fops, TTM_PL_VRAM },
2458 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
2459         { "amdgpu_gtt", &amdgpu_ttm_gtt_fops, TTM_PL_TT },
2460 #endif
2461         { "amdgpu_iomem", &amdgpu_ttm_iomem_fops, TTM_PL_SYSTEM },
2462 };
2463
2464 #endif
2465
2466 static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev)
2467 {
2468 #if defined(CONFIG_DEBUG_FS)
2469         unsigned count;
2470
2471         struct drm_minor *minor = adev->ddev->primary;
2472         struct dentry *ent, *root = minor->debugfs_root;
2473
2474         for (count = 0; count < ARRAY_SIZE(ttm_debugfs_entries); count++) {
2475                 ent = debugfs_create_file(
2476                                 ttm_debugfs_entries[count].name,
2477                                 S_IFREG | S_IRUGO, root,
2478                                 adev,
2479                                 ttm_debugfs_entries[count].fops);
2480                 if (IS_ERR(ent))
2481                         return PTR_ERR(ent);
2482                 if (ttm_debugfs_entries[count].domain == TTM_PL_VRAM)
2483                         i_size_write(ent->d_inode, adev->gmc.mc_vram_size);
2484                 else if (ttm_debugfs_entries[count].domain == TTM_PL_TT)
2485                         i_size_write(ent->d_inode, adev->gmc.gart_size);
2486                 adev->mman.debugfs_entries[count] = ent;
2487         }
2488
2489         count = ARRAY_SIZE(amdgpu_ttm_debugfs_list);
2490
2491 #ifdef CONFIG_SWIOTLB
2492         if (!(adev->need_swiotlb && swiotlb_nr_tbl()))
2493                 --count;
2494 #endif
2495
2496         return amdgpu_debugfs_add_files(adev, amdgpu_ttm_debugfs_list, count);
2497 #else
2498         return 0;
2499 #endif
2500 }
2501
2502 static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev)
2503 {
2504 #if defined(CONFIG_DEBUG_FS)
2505         unsigned i;
2506
2507         for (i = 0; i < ARRAY_SIZE(ttm_debugfs_entries); i++)
2508                 debugfs_remove(adev->mman.debugfs_entries[i]);
2509 #endif
2510 }