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

   1 /*
   2  * Copyright 2009 Jerome Glisse.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * The above copyright notice and this permission notice (including the
  22  * next paragraph) shall be included in all copies or substantial portions
  23  * of the Software.
  24  *
  25  */
  26 /*
  27  * Authors:
  28  *    Jerome Glisse <glisse@freedesktop.org>
  29  *    Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
  30  *    Dave Airlie
  31  */
  32
  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->gem_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 reservation_object *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->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 retry = 0;
 798         int r = 0;
 799
 800         if (!mm) /* Happens during process shutdown */
 801                 return -ESRCH;
 802
 803         if (unlikely(!mirror)) {
 804                 DRM_DEBUG_DRIVER("Failed to get hmm_mirror\n");
 805                 r = -EFAULT;
 806                 goto out;
 807         }
 808
 809         vma = find_vma(mm, start);
 810         if (unlikely(!vma || start < vma->vm_start)) {
 811                 r = -EFAULT;
 812                 goto out;
 813         }
 814         if (unlikely((gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) &&
 815                 vma->vm_file)) {
 816                 r = -EPERM;
 817                 goto out;
 818         }
 819
 820         range = kzalloc(sizeof(*range), GFP_KERNEL);
 821         if (unlikely(!range)) {
 822                 r = -ENOMEM;
 823                 goto out;
 824         }
 825
 826         pfns = kvmalloc_array(ttm->num_pages, sizeof(*pfns), GFP_KERNEL);
 827         if (unlikely(!pfns)) {
 828                 r = -ENOMEM;
 829                 goto out_free_ranges;
 830         }
 831
 832         amdgpu_hmm_init_range(range);
 833         range->default_flags = range->flags[HMM_PFN_VALID];
 834         range->default_flags |= amdgpu_ttm_tt_is_readonly(ttm) ?
 835                                 0 : range->flags[HMM_PFN_WRITE];
 836         range->pfn_flags_mask = 0;
 837         range->pfns = pfns;
 838         hmm_range_register(range, mirror, start,
 839                            start + ttm->num_pages * PAGE_SIZE, PAGE_SHIFT);
 840
 841 retry:
 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
 851         r = hmm_range_fault(range, true);
 852         if (unlikely(r < 0)) {
 853                 if (likely(r == -EAGAIN)) {
 854                         /*
 855                          * return -EAGAIN, mmap_sem is dropped
 856                          */
 857                         if (retry++ < MAX_RETRY_HMM_RANGE_FAULT)
 858                                 goto retry;
 859                         else
 860                                 pr_err("Retry hmm fault too many times\n");
 861                 }
 862
 863                 goto out_up_read;
 864         }
 865
 866         up_read(&mm->mmap_sem);
 867
 868         for (i = 0; i < ttm->num_pages; i++) {
 869                 pages[i] = hmm_device_entry_to_page(range, pfns[i]);
 870                 if (unlikely(!pages[i])) {
 871                         pr_err("Page fault failed for pfn[%lu] = 0x%llx\n",
 872                                i, pfns[i]);
 873                         r = -ENOMEM;
 874
 875                         goto out_free_pfns;
 876                 }
 877         }
 878
 879         gtt->range = range;
 880
 881         return 0;
 882
 883 out_up_read:
 884         if (likely(r != -EAGAIN))
 885                 up_read(&mm->mmap_sem);
 886 out_free_pfns:
 887         hmm_range_unregister(range);
 888         kvfree(pfns);
 889 out_free_ranges:
 890         kfree(range);
 891 out:
 892         return r;
 893 }
 894
 895 /**
 896  * amdgpu_ttm_tt_userptr_range_done - stop HMM track the CPU page table change
 897  * Check if the pages backing this ttm range have been invalidated
 898  *
 899  * Returns: true if pages are still valid
 900  */
 901 bool amdgpu_ttm_tt_get_user_pages_done(struct ttm_tt *ttm)
 902 {
 903         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 904         bool r = false;
 905
 906         if (!gtt || !gtt->userptr)
 907                 return false;
 908
 909         DRM_DEBUG_DRIVER("user_pages_done 0x%llx pages 0x%lx\n",
 910                 gtt->userptr, ttm->num_pages);
 911
 912         WARN_ONCE(!gtt->range || !gtt->range->pfns,
 913                 "No user pages to check\n");
 914
 915         if (gtt->range) {
 916                 r = hmm_range_valid(gtt->range);
 917                 hmm_range_unregister(gtt->range);
 918
 919                 kvfree(gtt->range->pfns);
 920                 kfree(gtt->range);
 921                 gtt->range = NULL;
 922         }
 923
 924         return r;
 925 }
 926 #endif
 927
 928 /**
 929  * amdgpu_ttm_tt_set_user_pages - Copy pages in, putting old pages as necessary.
 930  *
 931  * Called by amdgpu_cs_list_validate(). This creates the page list
 932  * that backs user memory and will ultimately be mapped into the device
 933  * address space.
 934  */
 935 void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct page **pages)
 936 {
 937         unsigned long i;
 938
 939         for (i = 0; i < ttm->num_pages; ++i)
 940                 ttm->pages[i] = pages ? pages[i] : NULL;
 941 }
 942
 943 /**
 944  * amdgpu_ttm_tt_pin_userptr -  prepare the sg table with the user pages
 945  *
 946  * Called by amdgpu_ttm_backend_bind()
 947  **/
 948 static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt *ttm)
 949 {
 950         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
 951         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 952         unsigned nents;
 953         int r;
 954
 955         int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
 956         enum dma_data_direction direction = write ?
 957                 DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 958
 959         /* Allocate an SG array and squash pages into it */
 960         r = sg_alloc_table_from_pages(ttm->sg, ttm->pages, ttm->num_pages, 0,
 961                                       ttm->num_pages << PAGE_SHIFT,
 962                                       GFP_KERNEL);
 963         if (r)
 964                 goto release_sg;
 965
 966         /* Map SG to device */
 967         r = -ENOMEM;
 968         nents = dma_map_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
 969         if (nents != ttm->sg->nents)
 970                 goto release_sg;
 971
 972         /* convert SG to linear array of pages and dma addresses */
 973         drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
 974                                          gtt->ttm.dma_address, ttm->num_pages);
 975
 976         return 0;
 977
 978 release_sg:
 979         kfree(ttm->sg);
 980         return r;
 981 }
 982
 983 /**
 984  * amdgpu_ttm_tt_unpin_userptr - Unpin and unmap userptr pages
 985  */
 986 static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
 987 {
 988         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
 989         struct amdgpu_ttm_tt *gtt = (void *)ttm;
 990
 991         int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
 992         enum dma_data_direction direction = write ?
 993                 DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 994
 995         /* double check that we don't free the table twice */
 996         if (!ttm->sg->sgl)
 997                 return;
 998
 999         /* unmap the pages mapped to the device */
1000         dma_unmap_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
1001
1002         sg_free_table(ttm->sg);
1003
1004 #if IS_ENABLED(CONFIG_DRM_AMDGPU_USERPTR)
1005         if (gtt->range &&
1006             ttm->pages[0] == hmm_device_entry_to_page(gtt->range,
1007                                                       gtt->range->pfns[0]))
1008                 WARN_ONCE(1, "Missing get_user_page_done\n");
1009 #endif
1010 }
1011
1012 int amdgpu_ttm_gart_bind(struct amdgpu_device *adev,
1013                                 struct ttm_buffer_object *tbo,
1014                                 uint64_t flags)
1015 {
1016         struct amdgpu_bo *abo = ttm_to_amdgpu_bo(tbo);
1017         struct ttm_tt *ttm = tbo->ttm;
1018         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1019         int r;
1020
1021         if (abo->flags & AMDGPU_GEM_CREATE_MQD_GFX9) {
1022                 uint64_t page_idx = 1;
1023
1024                 r = amdgpu_gart_bind(adev, gtt->offset, page_idx,
1025                                 ttm->pages, gtt->ttm.dma_address, flags);
1026                 if (r)
1027                         goto gart_bind_fail;
1028
1029                 /* Patch mtype of the second part BO */
1030                 flags &= ~AMDGPU_PTE_MTYPE_VG10_MASK;
1031                 flags |= AMDGPU_PTE_MTYPE_VG10(AMDGPU_MTYPE_NC);
1032
1033                 r = amdgpu_gart_bind(adev,
1034                                 gtt->offset + (page_idx << PAGE_SHIFT),
1035                                 ttm->num_pages - page_idx,
1036                                 &ttm->pages[page_idx],
1037                                 &(gtt->ttm.dma_address[page_idx]), flags);
1038         } else {
1039                 r = amdgpu_gart_bind(adev, gtt->offset, ttm->num_pages,
1040                                      ttm->pages, gtt->ttm.dma_address, flags);
1041         }
1042
1043 gart_bind_fail:
1044         if (r)
1045                 DRM_ERROR("failed to bind %lu pages at 0x%08llX\n",
1046                           ttm->num_pages, gtt->offset);
1047
1048         return r;
1049 }
1050
1051 /**
1052  * amdgpu_ttm_backend_bind - Bind GTT memory
1053  *
1054  * Called by ttm_tt_bind() on behalf of ttm_bo_handle_move_mem().
1055  * This handles binding GTT memory to the device address space.
1056  */
1057 static int amdgpu_ttm_backend_bind(struct ttm_tt *ttm,
1058                                    struct ttm_mem_reg *bo_mem)
1059 {
1060         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
1061         struct amdgpu_ttm_tt *gtt = (void*)ttm;
1062         uint64_t flags;
1063         int r = 0;
1064
1065         if (gtt->userptr) {
1066                 r = amdgpu_ttm_tt_pin_userptr(ttm);
1067                 if (r) {
1068                         DRM_ERROR("failed to pin userptr\n");
1069                         return r;
1070                 }
1071         }
1072         if (!ttm->num_pages) {
1073                 WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
1074                      ttm->num_pages, bo_mem, ttm);
1075         }
1076
1077         if (bo_mem->mem_type == AMDGPU_PL_GDS ||
1078             bo_mem->mem_type == AMDGPU_PL_GWS ||
1079             bo_mem->mem_type == AMDGPU_PL_OA)
1080                 return -EINVAL;
1081
1082         if (!amdgpu_gtt_mgr_has_gart_addr(bo_mem)) {
1083                 gtt->offset = AMDGPU_BO_INVALID_OFFSET;
1084                 return 0;
1085         }
1086
1087         /* compute PTE flags relevant to this BO memory */
1088         flags = amdgpu_ttm_tt_pte_flags(adev, ttm, bo_mem);
1089
1090         /* bind pages into GART page tables */
1091         gtt->offset = (u64)bo_mem->start << PAGE_SHIFT;
1092         r = amdgpu_gart_bind(adev, gtt->offset, ttm->num_pages,
1093                 ttm->pages, gtt->ttm.dma_address, flags);
1094
1095         if (r)
1096                 DRM_ERROR("failed to bind %lu pages at 0x%08llX\n",
1097                           ttm->num_pages, gtt->offset);
1098         return r;
1099 }
1100
1101 /**
1102  * amdgpu_ttm_alloc_gart - Allocate GART memory for buffer object
1103  */
1104 int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
1105 {
1106         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
1107         struct ttm_operation_ctx ctx = { false, false };
1108         struct amdgpu_ttm_tt *gtt = (void*)bo->ttm;
1109         struct ttm_mem_reg tmp;
1110         struct ttm_placement placement;
1111         struct ttm_place placements;
1112         uint64_t addr, flags;
1113         int r;
1114
1115         if (bo->mem.start != AMDGPU_BO_INVALID_OFFSET)
1116                 return 0;
1117
1118         addr = amdgpu_gmc_agp_addr(bo);
1119         if (addr != AMDGPU_BO_INVALID_OFFSET) {
1120                 bo->mem.start = addr >> PAGE_SHIFT;
1121         } else {
1122
1123                 /* allocate GART space */
1124                 tmp = bo->mem;
1125                 tmp.mm_node = NULL;
1126                 placement.num_placement = 1;
1127                 placement.placement = &placements;
1128                 placement.num_busy_placement = 1;
1129                 placement.busy_placement = &placements;
1130                 placements.fpfn = 0;
1131                 placements.lpfn = adev->gmc.gart_size >> PAGE_SHIFT;
1132                 placements.flags = (bo->mem.placement & ~TTM_PL_MASK_MEM) |
1133                         TTM_PL_FLAG_TT;
1134
1135                 r = ttm_bo_mem_space(bo, &placement, &tmp, &ctx);
1136                 if (unlikely(r))
1137                         return r;
1138
1139                 /* compute PTE flags for this buffer object */
1140                 flags = amdgpu_ttm_tt_pte_flags(adev, bo->ttm, &tmp);
1141
1142                 /* Bind pages */
1143                 gtt->offset = (u64)tmp.start << PAGE_SHIFT;
1144                 r = amdgpu_ttm_gart_bind(adev, bo, flags);
1145                 if (unlikely(r)) {
1146                         ttm_bo_mem_put(bo, &tmp);
1147                         return r;
1148                 }
1149
1150                 ttm_bo_mem_put(bo, &bo->mem);
1151                 bo->mem = tmp;
1152         }
1153
1154         bo->offset = (bo->mem.start << PAGE_SHIFT) +
1155                 bo->bdev->man[bo->mem.mem_type].gpu_offset;
1156
1157         return 0;
1158 }
1159
1160 /**
1161  * amdgpu_ttm_recover_gart - Rebind GTT pages
1162  *
1163  * Called by amdgpu_gtt_mgr_recover() from amdgpu_device_reset() to
1164  * rebind GTT pages during a GPU reset.
1165  */
1166 int amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo)
1167 {
1168         struct amdgpu_device *adev = amdgpu_ttm_adev(tbo->bdev);
1169         uint64_t flags;
1170         int r;
1171
1172         if (!tbo->ttm)
1173                 return 0;
1174
1175         flags = amdgpu_ttm_tt_pte_flags(adev, tbo->ttm, &tbo->mem);
1176         r = amdgpu_ttm_gart_bind(adev, tbo, flags);
1177
1178         return r;
1179 }
1180
1181 /**
1182  * amdgpu_ttm_backend_unbind - Unbind GTT mapped pages
1183  *
1184  * Called by ttm_tt_unbind() on behalf of ttm_bo_move_ttm() and
1185  * ttm_tt_destroy().
1186  */
1187 static int amdgpu_ttm_backend_unbind(struct ttm_tt *ttm)
1188 {
1189         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
1190         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1191         int r;
1192
1193         /* if the pages have userptr pinning then clear that first */
1194         if (gtt->userptr)
1195                 amdgpu_ttm_tt_unpin_userptr(ttm);
1196
1197         if (gtt->offset == AMDGPU_BO_INVALID_OFFSET)
1198                 return 0;
1199
1200         /* unbind shouldn't be done for GDS/GWS/OA in ttm_bo_clean_mm */
1201         r = amdgpu_gart_unbind(adev, gtt->offset, ttm->num_pages);
1202         if (r)
1203                 DRM_ERROR("failed to unbind %lu pages at 0x%08llX\n",
1204                           gtt->ttm.ttm.num_pages, gtt->offset);
1205         return r;
1206 }
1207
1208 static void amdgpu_ttm_backend_destroy(struct ttm_tt *ttm)
1209 {
1210         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1211
1212         if (gtt->usertask)
1213                 put_task_struct(gtt->usertask);
1214
1215         ttm_dma_tt_fini(&gtt->ttm);
1216         kfree(gtt);
1217 }
1218
1219 static struct ttm_backend_func amdgpu_backend_func = {
1220         .bind = &amdgpu_ttm_backend_bind,
1221         .unbind = &amdgpu_ttm_backend_unbind,
1222         .destroy = &amdgpu_ttm_backend_destroy,
1223 };
1224
1225 /**
1226  * amdgpu_ttm_tt_create - Create a ttm_tt object for a given BO
1227  *
1228  * @bo: The buffer object to create a GTT ttm_tt object around
1229  *
1230  * Called by ttm_tt_create().
1231  */
1232 static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_buffer_object *bo,
1233                                            uint32_t page_flags)
1234 {
1235         struct amdgpu_device *adev;
1236         struct amdgpu_ttm_tt *gtt;
1237
1238         adev = amdgpu_ttm_adev(bo->bdev);
1239
1240         gtt = kzalloc(sizeof(struct amdgpu_ttm_tt), GFP_KERNEL);
1241         if (gtt == NULL) {
1242                 return NULL;
1243         }
1244         gtt->ttm.ttm.func = &amdgpu_backend_func;
1245
1246         /* allocate space for the uninitialized page entries */
1247         if (ttm_sg_tt_init(&gtt->ttm, bo, page_flags)) {
1248                 kfree(gtt);
1249                 return NULL;
1250         }
1251         return &gtt->ttm.ttm;
1252 }
1253
1254 /**
1255  * amdgpu_ttm_tt_populate - Map GTT pages visible to the device
1256  *
1257  * Map the pages of a ttm_tt object to an address space visible
1258  * to the underlying device.
1259  */
1260 static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm,
1261                         struct ttm_operation_ctx *ctx)
1262 {
1263         struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
1264         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1265         bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
1266
1267         /* user pages are bound by amdgpu_ttm_tt_pin_userptr() */
1268         if (gtt && gtt->userptr) {
1269                 ttm->sg = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
1270                 if (!ttm->sg)
1271                         return -ENOMEM;
1272
1273                 ttm->page_flags |= TTM_PAGE_FLAG_SG;
1274                 ttm->state = tt_unbound;
1275                 return 0;
1276         }
1277
1278         if (slave && ttm->sg) {
1279                 drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
1280                                                  gtt->ttm.dma_address,
1281                                                  ttm->num_pages);
1282                 ttm->state = tt_unbound;
1283                 return 0;
1284         }
1285
1286 #ifdef CONFIG_SWIOTLB
1287         if (adev->need_swiotlb && swiotlb_nr_tbl()) {
1288                 return ttm_dma_populate(&gtt->ttm, adev->dev, ctx);
1289         }
1290 #endif
1291
1292         /* fall back to generic helper to populate the page array
1293          * and map them to the device */
1294         return ttm_populate_and_map_pages(adev->dev, &gtt->ttm, ctx);
1295 }
1296
1297 /**
1298  * amdgpu_ttm_tt_unpopulate - unmap GTT pages and unpopulate page arrays
1299  *
1300  * Unmaps pages of a ttm_tt object from the device address space and
1301  * unpopulates the page array backing it.
1302  */
1303 static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
1304 {
1305         struct amdgpu_device *adev;
1306         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1307         bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
1308
1309         if (gtt && gtt->userptr) {
1310                 amdgpu_ttm_tt_set_user_pages(ttm, NULL);
1311                 kfree(ttm->sg);
1312                 ttm->page_flags &= ~TTM_PAGE_FLAG_SG;
1313                 return;
1314         }
1315
1316         if (slave)
1317                 return;
1318
1319         adev = amdgpu_ttm_adev(ttm->bdev);
1320
1321 #ifdef CONFIG_SWIOTLB
1322         if (adev->need_swiotlb && swiotlb_nr_tbl()) {
1323                 ttm_dma_unpopulate(&gtt->ttm, adev->dev);
1324                 return;
1325         }
1326 #endif
1327
1328         /* fall back to generic helper to unmap and unpopulate array */
1329         ttm_unmap_and_unpopulate_pages(adev->dev, &gtt->ttm);
1330 }
1331
1332 /**
1333  * amdgpu_ttm_tt_set_userptr - Initialize userptr GTT ttm_tt for the current
1334  * task
1335  *
1336  * @ttm: The ttm_tt object to bind this userptr object to
1337  * @addr:  The address in the current tasks VM space to use
1338  * @flags: Requirements of userptr object.
1339  *
1340  * Called by amdgpu_gem_userptr_ioctl() to bind userptr pages
1341  * to current task
1342  */
1343 int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr,
1344                               uint32_t flags)
1345 {
1346         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1347
1348         if (gtt == NULL)
1349                 return -EINVAL;
1350
1351         gtt->userptr = addr;
1352         gtt->userflags = flags;
1353
1354         if (gtt->usertask)
1355                 put_task_struct(gtt->usertask);
1356         gtt->usertask = current->group_leader;
1357         get_task_struct(gtt->usertask);
1358
1359         return 0;
1360 }
1361
1362 /**
1363  * amdgpu_ttm_tt_get_usermm - Return memory manager for ttm_tt object
1364  */
1365 struct mm_struct *amdgpu_ttm_tt_get_usermm(struct ttm_tt *ttm)
1366 {
1367         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1368
1369         if (gtt == NULL)
1370                 return NULL;
1371
1372         if (gtt->usertask == NULL)
1373                 return NULL;
1374
1375         return gtt->usertask->mm;
1376 }
1377
1378 /**
1379  * amdgpu_ttm_tt_affect_userptr - Determine if a ttm_tt object lays inside an
1380  * address range for the current task.
1381  *
1382  */
1383 bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
1384                                   unsigned long end)
1385 {
1386         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1387         unsigned long size;
1388
1389         if (gtt == NULL || !gtt->userptr)
1390                 return false;
1391
1392         /* Return false if no part of the ttm_tt object lies within
1393          * the range
1394          */
1395         size = (unsigned long)gtt->ttm.ttm.num_pages * PAGE_SIZE;
1396         if (gtt->userptr > end || gtt->userptr + size <= start)
1397                 return false;
1398
1399         return true;
1400 }
1401
1402 /**
1403  * amdgpu_ttm_tt_is_userptr - Have the pages backing by userptr?
1404  */
1405 bool amdgpu_ttm_tt_is_userptr(struct ttm_tt *ttm)
1406 {
1407         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1408
1409         if (gtt == NULL || !gtt->userptr)
1410                 return false;
1411
1412         return true;
1413 }
1414
1415 /**
1416  * amdgpu_ttm_tt_is_readonly - Is the ttm_tt object read only?
1417  */
1418 bool amdgpu_ttm_tt_is_readonly(struct ttm_tt *ttm)
1419 {
1420         struct amdgpu_ttm_tt *gtt = (void *)ttm;
1421
1422         if (gtt == NULL)
1423                 return false;
1424
1425         return !!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
1426 }
1427
1428 /**
1429  * amdgpu_ttm_tt_pde_flags - Compute PDE flags for ttm_tt object
1430  *
1431  * @ttm: The ttm_tt object to compute the flags for
1432  * @mem: The memory registry backing this ttm_tt object
1433  *
1434  * Figure out the flags to use for a VM PDE (Page Directory Entry).
1435  */
1436 uint64_t amdgpu_ttm_tt_pde_flags(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
1437 {
1438         uint64_t flags = 0;
1439
1440         if (mem && mem->mem_type != TTM_PL_SYSTEM)
1441                 flags |= AMDGPU_PTE_VALID;
1442
1443         if (mem && mem->mem_type == TTM_PL_TT) {
1444                 flags |= AMDGPU_PTE_SYSTEM;
1445
1446                 if (ttm->caching_state == tt_cached)
1447                         flags |= AMDGPU_PTE_SNOOPED;
1448         }
1449
1450         return flags;
1451 }
1452
1453 /**
1454  * amdgpu_ttm_tt_pte_flags - Compute PTE flags for ttm_tt object
1455  *
1456  * @ttm: The ttm_tt object to compute the flags for
1457  * @mem: The memory registry backing this ttm_tt object
1458
1459  * Figure out the flags to use for a VM PTE (Page Table Entry).
1460  */
1461 uint64_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
1462                                  struct ttm_mem_reg *mem)
1463 {
1464         uint64_t flags = amdgpu_ttm_tt_pde_flags(ttm, mem);
1465
1466         flags |= adev->gart.gart_pte_flags;
1467         flags |= AMDGPU_PTE_READABLE;
1468
1469         if (!amdgpu_ttm_tt_is_readonly(ttm))
1470                 flags |= AMDGPU_PTE_WRITEABLE;
1471
1472         return flags;
1473 }
1474
1475 /**
1476  * amdgpu_ttm_bo_eviction_valuable - Check to see if we can evict a buffer
1477  * object.
1478  *
1479  * Return true if eviction is sensible. Called by ttm_mem_evict_first() on
1480  * behalf of ttm_bo_mem_force_space() which tries to evict buffer objects until
1481  * it can find space for a new object and by ttm_bo_force_list_clean() which is
1482  * used to clean out a memory space.
1483  */
1484 static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
1485                                             const struct ttm_place *place)
1486 {
1487         unsigned long num_pages = bo->mem.num_pages;
1488         struct drm_mm_node *node = bo->mem.mm_node;
1489         struct reservation_object_list *flist;
1490         struct dma_fence *f;
1491         int i;
1492
1493         /* Don't evict VM page tables while they are busy, otherwise we can't
1494          * cleanly handle page faults.
1495          */
1496         if (bo->type == ttm_bo_type_kernel &&
1497             !reservation_object_test_signaled_rcu(bo->resv, true))
1498                 return false;
1499
1500         /* If bo is a KFD BO, check if the bo belongs to the current process.
1501          * If true, then return false as any KFD process needs all its BOs to
1502          * be resident to run successfully
1503          */
1504         flist = reservation_object_get_list(bo->resv);
1505         if (flist) {
1506                 for (i = 0; i < flist->shared_count; ++i) {
1507                         f = rcu_dereference_protected(flist->shared[i],
1508                                 reservation_object_held(bo->resv));
1509                         if (amdkfd_fence_check_mm(f, current->mm))
1510                                 return false;
1511                 }
1512         }
1513
1514         switch (bo->mem.mem_type) {
1515         case TTM_PL_TT:
1516                 return true;
1517
1518         case TTM_PL_VRAM:
1519                 /* Check each drm MM node individually */
1520                 while (num_pages) {
1521                         if (place->fpfn < (node->start + node->size) &&
1522                             !(place->lpfn && place->lpfn <= node->start))
1523                                 return true;
1524
1525                         num_pages -= node->size;
1526                         ++node;
1527                 }
1528                 return false;
1529
1530         default:
1531                 break;
1532         }
1533
1534         return ttm_bo_eviction_valuable(bo, place);
1535 }
1536
1537 /**
1538  * amdgpu_ttm_access_memory - Read or Write memory that backs a buffer object.
1539  *
1540  * @bo:  The buffer object to read/write
1541  * @offset:  Offset into buffer object
1542  * @buf:  Secondary buffer to write/read from
1543  * @len: Length in bytes of access
1544  * @write:  true if writing
1545  *
1546  * This is used to access VRAM that backs a buffer object via MMIO
1547  * access for debugging purposes.
1548  */
1549 static int amdgpu_ttm_access_memory(struct ttm_buffer_object *bo,
1550                                     unsigned long offset,
1551                                     void *buf, int len, int write)
1552 {
1553         struct amdgpu_bo *abo = ttm_to_amdgpu_bo(bo);
1554         struct amdgpu_device *adev = amdgpu_ttm_adev(abo->tbo.bdev);
1555         struct drm_mm_node *nodes;
1556         uint32_t value = 0;
1557         int ret = 0;
1558         uint64_t pos;
1559         unsigned long flags;
1560
1561         if (bo->mem.mem_type != TTM_PL_VRAM)
1562                 return -EIO;
1563
1564         nodes = amdgpu_find_mm_node(&abo->tbo.mem, &offset);
1565         pos = (nodes->start << PAGE_SHIFT) + offset;
1566
1567         while (len && pos < adev->gmc.mc_vram_size) {
1568                 uint64_t aligned_pos = pos & ~(uint64_t)3;
1569                 uint32_t bytes = 4 - (pos & 3);
1570                 uint32_t shift = (pos & 3) * 8;
1571                 uint32_t mask = 0xffffffff << shift;
1572
1573                 if (len < bytes) {
1574                         mask &= 0xffffffff >> (bytes - len) * 8;
1575                         bytes = len;
1576                 }
1577
1578                 spin_lock_irqsave(&adev->mmio_idx_lock, flags);
1579                 WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)aligned_pos) | 0x80000000);
1580                 WREG32_NO_KIQ(mmMM_INDEX_HI, aligned_pos >> 31);
1581                 if (!write || mask != 0xffffffff)
1582                         value = RREG32_NO_KIQ(mmMM_DATA);
1583                 if (write) {
1584                         value &= ~mask;
1585                         value |= (*(uint32_t *)buf << shift) & mask;
1586                         WREG32_NO_KIQ(mmMM_DATA, value);
1587                 }
1588                 spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
1589                 if (!write) {
1590                         value = (value & mask) >> shift;
1591                         memcpy(buf, &value, bytes);
1592                 }
1593
1594                 ret += bytes;
1595                 buf = (uint8_t *)buf + bytes;
1596                 pos += bytes;
1597                 len -= bytes;
1598                 if (pos >= (nodes->start + nodes->size) << PAGE_SHIFT) {
1599                         ++nodes;
1600                         pos = (nodes->start << PAGE_SHIFT);
1601                 }
1602         }
1603
1604         return ret;
1605 }
1606
1607 static struct ttm_bo_driver amdgpu_bo_driver = {
1608         .ttm_tt_create = &amdgpu_ttm_tt_create,
1609         .ttm_tt_populate = &amdgpu_ttm_tt_populate,
1610         .ttm_tt_unpopulate = &amdgpu_ttm_tt_unpopulate,
1611         .invalidate_caches = &amdgpu_invalidate_caches,
1612         .init_mem_type = &amdgpu_init_mem_type,
1613         .eviction_valuable = amdgpu_ttm_bo_eviction_valuable,
1614         .evict_flags = &amdgpu_evict_flags,
1615         .move = &amdgpu_bo_move,
1616         .verify_access = &amdgpu_verify_access,
1617         .move_notify = &amdgpu_bo_move_notify,
1618         .release_notify = &amdgpu_bo_release_notify,
1619         .fault_reserve_notify = &amdgpu_bo_fault_reserve_notify,
1620         .io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
1621         .io_mem_free = &amdgpu_ttm_io_mem_free,
1622         .io_mem_pfn = amdgpu_ttm_io_mem_pfn,
1623         .access_memory = &amdgpu_ttm_access_memory,
1624         .del_from_lru_notify = &amdgpu_vm_del_from_lru_notify
1625 };
1626
1627 /*
1628  * Firmware Reservation functions
1629  */
1630 /**
1631  * amdgpu_ttm_fw_reserve_vram_fini - free fw reserved vram
1632  *
1633  * @adev: amdgpu_device pointer
1634  *
1635  * free fw reserved vram if it has been reserved.
1636  */
1637 static void amdgpu_ttm_fw_reserve_vram_fini(struct amdgpu_device *adev)
1638 {
1639         amdgpu_bo_free_kernel(&adev->fw_vram_usage.reserved_bo,
1640                 NULL, &adev->fw_vram_usage.va);
1641 }
1642
1643 /**
1644  * amdgpu_ttm_fw_reserve_vram_init - create bo vram reservation from fw
1645  *
1646  * @adev: amdgpu_device pointer
1647  *
1648  * create bo vram reservation from fw.
1649  */
1650 static int amdgpu_ttm_fw_reserve_vram_init(struct amdgpu_device *adev)
1651 {
1652         struct ttm_operation_ctx ctx = { false, false };
1653         struct amdgpu_bo_param bp;
1654         int r = 0;
1655         int i;
1656         u64 vram_size = adev->gmc.visible_vram_size;
1657         u64 offset = adev->fw_vram_usage.start_offset;
1658         u64 size = adev->fw_vram_usage.size;
1659         struct amdgpu_bo *bo;
1660
1661         memset(&bp, 0, sizeof(bp));
1662         bp.size = adev->fw_vram_usage.size;
1663         bp.byte_align = PAGE_SIZE;
1664         bp.domain = AMDGPU_GEM_DOMAIN_VRAM;
1665         bp.flags = AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
1666                 AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
1667         bp.type = ttm_bo_type_kernel;
1668         bp.resv = NULL;
1669         adev->fw_vram_usage.va = NULL;
1670         adev->fw_vram_usage.reserved_bo = NULL;
1671
1672         if (adev->fw_vram_usage.size > 0 &&
1673                 adev->fw_vram_usage.size <= vram_size) {
1674
1675                 r = amdgpu_bo_create(adev, &bp,
1676                                      &adev->fw_vram_usage.reserved_bo);
1677                 if (r)
1678                         goto error_create;
1679
1680                 r = amdgpu_bo_reserve(adev->fw_vram_usage.reserved_bo, false);
1681                 if (r)
1682                         goto error_reserve;
1683
1684                 /* remove the original mem node and create a new one at the
1685                  * request position
1686                  */
1687                 bo = adev->fw_vram_usage.reserved_bo;
1688                 offset = ALIGN(offset, PAGE_SIZE);
1689                 for (i = 0; i < bo->placement.num_placement; ++i) {
1690                         bo->placements[i].fpfn = offset >> PAGE_SHIFT;
1691                         bo->placements[i].lpfn = (offset + size) >> PAGE_SHIFT;
1692                 }
1693
1694                 ttm_bo_mem_put(&bo->tbo, &bo->tbo.mem);
1695                 r = ttm_bo_mem_space(&bo->tbo, &bo->placement,
1696                                      &bo->tbo.mem, &ctx);
1697                 if (r)
1698                         goto error_pin;
1699
1700                 r = amdgpu_bo_pin_restricted(adev->fw_vram_usage.reserved_bo,
1701                         AMDGPU_GEM_DOMAIN_VRAM,
1702                         adev->fw_vram_usage.start_offset,
1703                         (adev->fw_vram_usage.start_offset +
1704                         adev->fw_vram_usage.size));
1705                 if (r)
1706                         goto error_pin;
1707                 r = amdgpu_bo_kmap(adev->fw_vram_usage.reserved_bo,
1708                         &adev->fw_vram_usage.va);
1709                 if (r)
1710                         goto error_kmap;
1711
1712                 amdgpu_bo_unreserve(adev->fw_vram_usage.reserved_bo);
1713         }
1714         return r;
1715
1716 error_kmap:
1717         amdgpu_bo_unpin(adev->fw_vram_usage.reserved_bo);
1718 error_pin:
1719         amdgpu_bo_unreserve(adev->fw_vram_usage.reserved_bo);
1720 error_reserve:
1721         amdgpu_bo_unref(&adev->fw_vram_usage.reserved_bo);
1722 error_create:
1723         adev->fw_vram_usage.va = NULL;
1724         adev->fw_vram_usage.reserved_bo = NULL;
1725         return r;
1726 }
1727 /**
1728  * amdgpu_ttm_init - Init the memory management (ttm) as well as various
1729  * gtt/vram related fields.
1730  *
1731  * This initializes all of the memory space pools that the TTM layer
1732  * will need such as the GTT space (system memory mapped to the device),
1733  * VRAM (on-board memory), and on-chip memories (GDS, GWS, OA) which
1734  * can be mapped per VMID.
1735  */
1736 int amdgpu_ttm_init(struct amdgpu_device *adev)
1737 {
1738         uint64_t gtt_size;
1739         int r;
1740         u64 vis_vram_limit;
1741
1742         mutex_init(&adev->mman.gtt_window_lock);
1743
1744         /* No others user of address space so set it to 0 */
1745         r = ttm_bo_device_init(&adev->mman.bdev,
1746                                &amdgpu_bo_driver,
1747                                adev->ddev->anon_inode->i_mapping,
1748                                adev->need_dma32);
1749         if (r) {
1750                 DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
1751                 return r;
1752         }
1753         adev->mman.initialized = true;
1754
1755         /* We opt to avoid OOM on system pages allocations */
1756         adev->mman.bdev.no_retry = true;
1757
1758         /* Initialize VRAM pool with all of VRAM divided into pages */
1759         r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_VRAM,
1760                                 adev->gmc.real_vram_size >> PAGE_SHIFT);
1761         if (r) {
1762                 DRM_ERROR("Failed initializing VRAM heap.\n");
1763                 return r;
1764         }
1765
1766         /* Reduce size of CPU-visible VRAM if requested */
1767         vis_vram_limit = (u64)amdgpu_vis_vram_limit * 1024 * 1024;
1768         if (amdgpu_vis_vram_limit > 0 &&
1769             vis_vram_limit <= adev->gmc.visible_vram_size)
1770                 adev->gmc.visible_vram_size = vis_vram_limit;
1771
1772         /* Change the size here instead of the init above so only lpfn is affected */
1773         amdgpu_ttm_set_buffer_funcs_status(adev, false);
1774 #ifdef CONFIG_64BIT
1775         adev->mman.aper_base_kaddr = ioremap_wc(adev->gmc.aper_base,
1776                                                 adev->gmc.visible_vram_size);
1777 #endif
1778
1779         /*
1780          *The reserved vram for firmware must be pinned to the specified
1781          *place on the VRAM, so reserve it early.
1782          */
1783         r = amdgpu_ttm_fw_reserve_vram_init(adev);
1784         if (r) {
1785                 return r;
1786         }
1787
1788         /* allocate memory as required for VGA
1789          * This is used for VGA emulation and pre-OS scanout buffers to
1790          * avoid display artifacts while transitioning between pre-OS
1791          * and driver.  */
1792         r = amdgpu_bo_create_kernel(adev, adev->gmc.stolen_size, PAGE_SIZE,
1793                                     AMDGPU_GEM_DOMAIN_VRAM,
1794                                     &adev->stolen_vga_memory,
1795                                     NULL, NULL);
1796         if (r)
1797                 return r;
1798         DRM_INFO("amdgpu: %uM of VRAM memory ready\n",
1799                  (unsigned) (adev->gmc.real_vram_size / (1024 * 1024)));
1800
1801         /* Compute GTT size, either bsaed on 3/4th the size of RAM size
1802          * or whatever the user passed on module init */
1803         if (amdgpu_gtt_size == -1) {
1804                 struct sysinfo si;
1805
1806                 si_meminfo(&si);
1807                 gtt_size = min(max((AMDGPU_DEFAULT_GTT_SIZE_MB << 20),
1808                                adev->gmc.mc_vram_size),
1809                                ((uint64_t)si.totalram * si.mem_unit * 3/4));
1810         }
1811         else
1812                 gtt_size = (uint64_t)amdgpu_gtt_size << 20;
1813
1814         /* Initialize GTT memory pool */
1815         r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_TT, gtt_size >> PAGE_SHIFT);
1816         if (r) {
1817                 DRM_ERROR("Failed initializing GTT heap.\n");
1818                 return r;
1819         }
1820         DRM_INFO("amdgpu: %uM of GTT memory ready.\n",
1821                  (unsigned)(gtt_size / (1024 * 1024)));
1822
1823         /* Initialize various on-chip memory pools */
1824         r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_GDS,
1825                            adev->gds.gds_size);
1826         if (r) {
1827                 DRM_ERROR("Failed initializing GDS heap.\n");
1828                 return r;
1829         }
1830
1831         r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_GWS,
1832                            adev->gds.gws_size);
1833         if (r) {
1834                 DRM_ERROR("Failed initializing gws heap.\n");
1835                 return r;
1836         }
1837
1838         r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_OA,
1839                            adev->gds.oa_size);
1840         if (r) {
1841                 DRM_ERROR("Failed initializing oa heap.\n");
1842                 return r;
1843         }
1844
1845         /* Register debugfs entries for amdgpu_ttm */
1846         r = amdgpu_ttm_debugfs_init(adev);
1847         if (r) {
1848                 DRM_ERROR("Failed to init debugfs\n");
1849                 return r;
1850         }
1851         return 0;
1852 }
1853
1854 /**
1855  * amdgpu_ttm_late_init - Handle any late initialization for amdgpu_ttm
1856  */
1857 void amdgpu_ttm_late_init(struct amdgpu_device *adev)
1858 {
1859         /* return the VGA stolen memory (if any) back to VRAM */
1860         amdgpu_bo_free_kernel(&adev->stolen_vga_memory, NULL, NULL);
1861 }
1862
1863 /**
1864  * amdgpu_ttm_fini - De-initialize the TTM memory pools
1865  */
1866 void amdgpu_ttm_fini(struct amdgpu_device *adev)
1867 {
1868         if (!adev->mman.initialized)
1869                 return;
1870
1871         amdgpu_ttm_debugfs_fini(adev);
1872         amdgpu_ttm_fw_reserve_vram_fini(adev);
1873         if (adev->mman.aper_base_kaddr)
1874                 iounmap(adev->mman.aper_base_kaddr);
1875         adev->mman.aper_base_kaddr = NULL;
1876
1877         ttm_bo_clean_mm(&adev->mman.bdev, TTM_PL_VRAM);
1878         ttm_bo_clean_mm(&adev->mman.bdev, TTM_PL_TT);
1879         ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_GDS);
1880         ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_GWS);
1881         ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_OA);
1882         ttm_bo_device_release(&adev->mman.bdev);
1883         adev->mman.initialized = false;
1884         DRM_INFO("amdgpu: ttm finalized\n");
1885 }
1886
1887 /**
1888  * amdgpu_ttm_set_buffer_funcs_status - enable/disable use of buffer functions
1889  *
1890  * @adev: amdgpu_device pointer
1891  * @enable: true when we can use buffer functions.
1892  *
1893  * Enable/disable use of buffer functions during suspend/resume. This should
1894  * only be called at bootup or when userspace isn't running.
1895  */
1896 void amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable)
1897 {
1898         struct ttm_mem_type_manager *man = &adev->mman.bdev.man[TTM_PL_VRAM];
1899         uint64_t size;
1900         int r;
1901
1902         if (!adev->mman.initialized || adev->in_gpu_reset ||
1903             adev->mman.buffer_funcs_enabled == enable)
1904                 return;
1905
1906         if (enable) {
1907                 struct amdgpu_ring *ring;
1908                 struct drm_sched_rq *rq;
1909
1910                 ring = adev->mman.buffer_funcs_ring;
1911                 rq = &ring->sched.sched_rq[DRM_SCHED_PRIORITY_KERNEL];
1912                 r = drm_sched_entity_init(&adev->mman.entity, &rq, 1, NULL);
1913                 if (r) {
1914                         DRM_ERROR("Failed setting up TTM BO move entity (%d)\n",
1915                                   r);
1916                         return;
1917                 }
1918         } else {
1919                 drm_sched_entity_destroy(&adev->mman.entity);
1920                 dma_fence_put(man->move);
1921                 man->move = NULL;
1922         }
1923
1924         /* this just adjusts TTM size idea, which sets lpfn to the correct value */
1925         if (enable)
1926                 size = adev->gmc.real_vram_size;
1927         else
1928                 size = adev->gmc.visible_vram_size;
1929         man->size = size >> PAGE_SHIFT;
1930         adev->mman.buffer_funcs_enabled = enable;
1931 }
1932
1933 int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma)
1934 {
1935         struct drm_file *file_priv = filp->private_data;
1936         struct amdgpu_device *adev = file_priv->minor->dev->dev_private;
1937
1938         if (adev == NULL)
1939                 return -EINVAL;
1940
1941         return ttm_bo_mmap(filp, vma, &adev->mman.bdev);
1942 }
1943
1944 static int amdgpu_map_buffer(struct ttm_buffer_object *bo,
1945                              struct ttm_mem_reg *mem, unsigned num_pages,
1946                              uint64_t offset, unsigned window,
1947                              struct amdgpu_ring *ring,
1948                              uint64_t *addr)
1949 {
1950         struct amdgpu_ttm_tt *gtt = (void *)bo->ttm;
1951         struct amdgpu_device *adev = ring->adev;
1952         struct ttm_tt *ttm = bo->ttm;
1953         struct amdgpu_job *job;
1954         unsigned num_dw, num_bytes;
1955         dma_addr_t *dma_address;
1956         struct dma_fence *fence;
1957         uint64_t src_addr, dst_addr;
1958         uint64_t flags;
1959         int r;
1960
1961         BUG_ON(adev->mman.buffer_funcs->copy_max_bytes <
1962                AMDGPU_GTT_MAX_TRANSFER_SIZE * 8);
1963
1964         *addr = adev->gmc.gart_start;
1965         *addr += (u64)window * AMDGPU_GTT_MAX_TRANSFER_SIZE *
1966                 AMDGPU_GPU_PAGE_SIZE;
1967
1968         num_dw = adev->mman.buffer_funcs->copy_num_dw;
1969         while (num_dw & 0x7)
1970                 num_dw++;
1971
1972         num_bytes = num_pages * 8;
1973
1974         r = amdgpu_job_alloc_with_ib(adev, num_dw * 4 + num_bytes, &job);
1975         if (r)
1976                 return r;
1977
1978         src_addr = num_dw * 4;
1979         src_addr += job->ibs[0].gpu_addr;
1980
1981         dst_addr = amdgpu_bo_gpu_offset(adev->gart.bo);
1982         dst_addr += window * AMDGPU_GTT_MAX_TRANSFER_SIZE * 8;
1983         amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_addr,
1984                                 dst_addr, num_bytes);
1985
1986         amdgpu_ring_pad_ib(ring, &job->ibs[0]);
1987         WARN_ON(job->ibs[0].length_dw > num_dw);
1988
1989         dma_address = &gtt->ttm.dma_address[offset >> PAGE_SHIFT];
1990         flags = amdgpu_ttm_tt_pte_flags(adev, ttm, mem);
1991         r = amdgpu_gart_map(adev, 0, num_pages, dma_address, flags,
1992                             &job->ibs[0].ptr[num_dw]);
1993         if (r)
1994                 goto error_free;
1995
1996         r = amdgpu_job_submit(job, &adev->mman.entity,
1997                               AMDGPU_FENCE_OWNER_UNDEFINED, &fence);
1998         if (r)
1999                 goto error_free;
2000
2001         dma_fence_put(fence);
2002
2003         return r;
2004
2005 error_free:
2006         amdgpu_job_free(job);
2007         return r;
2008 }
2009
2010 int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
2011                        uint64_t dst_offset, uint32_t byte_count,
2012                        struct reservation_object *resv,
2013                        struct dma_fence **fence, bool direct_submit,
2014                        bool vm_needs_flush)
2015 {
2016         struct amdgpu_device *adev = ring->adev;
2017         struct amdgpu_job *job;
2018
2019         uint32_t max_bytes;
2020         unsigned num_loops, num_dw;
2021         unsigned i;
2022         int r;
2023
2024         if (direct_submit && !ring->sched.ready) {
2025                 DRM_ERROR("Trying to move memory with ring turned off.\n");
2026                 return -EINVAL;
2027         }
2028
2029         max_bytes = adev->mman.buffer_funcs->copy_max_bytes;
2030         num_loops = DIV_ROUND_UP(byte_count, max_bytes);
2031         num_dw = num_loops * adev->mman.buffer_funcs->copy_num_dw;
2032
2033         /* for IB padding */
2034         while (num_dw & 0x7)
2035                 num_dw++;
2036
2037         r = amdgpu_job_alloc_with_ib(adev, num_dw * 4, &job);
2038         if (r)
2039                 return r;
2040
2041         if (vm_needs_flush) {
2042                 job->vm_pd_addr = amdgpu_gmc_pd_addr(adev->gart.bo);
2043                 job->vm_needs_flush = true;
2044         }
2045         if (resv) {
2046                 r = amdgpu_sync_resv(adev, &job->sync, resv,
2047                                      AMDGPU_FENCE_OWNER_UNDEFINED,
2048                                      false);
2049                 if (r) {
2050                         DRM_ERROR("sync failed (%d).\n", r);
2051                         goto error_free;
2052                 }
2053         }
2054
2055         for (i = 0; i < num_loops; i++) {
2056                 uint32_t cur_size_in_bytes = min(byte_count, max_bytes);
2057
2058                 amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_offset,
2059                                         dst_offset, cur_size_in_bytes);
2060
2061                 src_offset += cur_size_in_bytes;
2062                 dst_offset += cur_size_in_bytes;
2063                 byte_count -= cur_size_in_bytes;
2064         }
2065
2066         amdgpu_ring_pad_ib(ring, &job->ibs[0]);
2067         WARN_ON(job->ibs[0].length_dw > num_dw);
2068         if (direct_submit)
2069                 r = amdgpu_job_submit_direct(job, ring, fence);
2070         else
2071                 r = amdgpu_job_submit(job, &adev->mman.entity,
2072                                       AMDGPU_FENCE_OWNER_UNDEFINED, fence);
2073         if (r)
2074                 goto error_free;
2075
2076         return r;
2077
2078 error_free:
2079         amdgpu_job_free(job);
2080         DRM_ERROR("Error scheduling IBs (%d)\n", r);
2081         return r;
2082 }
2083
2084 int amdgpu_fill_buffer(struct amdgpu_bo *bo,
2085                        uint32_t src_data,
2086                        struct reservation_object *resv,
2087                        struct dma_fence **fence)
2088 {
2089         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
2090         uint32_t max_bytes = adev->mman.buffer_funcs->fill_max_bytes;
2091         struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
2092
2093         struct drm_mm_node *mm_node;
2094         unsigned long num_pages;
2095         unsigned int num_loops, num_dw;
2096
2097         struct amdgpu_job *job;
2098         int r;
2099
2100         if (!adev->mman.buffer_funcs_enabled) {
2101                 DRM_ERROR("Trying to clear memory with ring turned off.\n");
2102                 return -EINVAL;
2103         }
2104
2105         if (bo->tbo.mem.mem_type == TTM_PL_TT) {
2106                 r = amdgpu_ttm_alloc_gart(&bo->tbo);
2107                 if (r)
2108                         return r;
2109         }
2110
2111         num_pages = bo->tbo.num_pages;
2112         mm_node = bo->tbo.mem.mm_node;
2113         num_loops = 0;
2114         while (num_pages) {
2115                 uint64_t byte_count = mm_node->size << PAGE_SHIFT;
2116
2117                 num_loops += DIV_ROUND_UP_ULL(byte_count, max_bytes);
2118                 num_pages -= mm_node->size;
2119                 ++mm_node;
2120         }
2121         num_dw = num_loops * adev->mman.buffer_funcs->fill_num_dw;
2122
2123         /* for IB padding */
2124         num_dw += 64;
2125
2126         r = amdgpu_job_alloc_with_ib(adev, num_dw * 4, &job);
2127         if (r)
2128                 return r;
2129
2130         if (resv) {
2131                 r = amdgpu_sync_resv(adev, &job->sync, resv,
2132                                      AMDGPU_FENCE_OWNER_UNDEFINED, false);
2133                 if (r) {
2134                         DRM_ERROR("sync failed (%d).\n", r);
2135                         goto error_free;
2136                 }
2137         }
2138
2139         num_pages = bo->tbo.num_pages;
2140         mm_node = bo->tbo.mem.mm_node;
2141
2142         while (num_pages) {
2143                 uint64_t byte_count = mm_node->size << PAGE_SHIFT;
2144                 uint64_t dst_addr;
2145
2146                 dst_addr = amdgpu_mm_node_addr(&bo->tbo, mm_node, &bo->tbo.mem);
2147                 while (byte_count) {
2148                         uint32_t cur_size_in_bytes = min_t(uint64_t, byte_count,
2149                                                            max_bytes);
2150
2151                         amdgpu_emit_fill_buffer(adev, &job->ibs[0], src_data,
2152                                                 dst_addr, cur_size_in_bytes);
2153
2154                         dst_addr += cur_size_in_bytes;
2155                         byte_count -= cur_size_in_bytes;
2156                 }
2157
2158                 num_pages -= mm_node->size;
2159                 ++mm_node;
2160         }
2161
2162         amdgpu_ring_pad_ib(ring, &job->ibs[0]);
2163         WARN_ON(job->ibs[0].length_dw > num_dw);
2164         r = amdgpu_job_submit(job, &adev->mman.entity,
2165                               AMDGPU_FENCE_OWNER_UNDEFINED, fence);
2166         if (r)
2167                 goto error_free;
2168
2169         return 0;
2170
2171 error_free:
2172         amdgpu_job_free(job);
2173         return r;
2174 }
2175
2176 #if defined(CONFIG_DEBUG_FS)
2177
2178 static int amdgpu_mm_dump_table(struct seq_file *m, void *data)
2179 {
2180         struct drm_info_node *node = (struct drm_info_node *)m->private;
2181         unsigned ttm_pl = (uintptr_t)node->info_ent->data;
2182         struct drm_device *dev = node->minor->dev;
2183         struct amdgpu_device *adev = dev->dev_private;
2184         struct ttm_mem_type_manager *man = &adev->mman.bdev.man[ttm_pl];
2185         struct drm_printer p = drm_seq_file_printer(m);
2186
2187         man->func->debug(man, &p);
2188         return 0;
2189 }
2190
2191 static const struct drm_info_list amdgpu_ttm_debugfs_list[] = {
2192         {"amdgpu_vram_mm", amdgpu_mm_dump_table, 0, (void *)TTM_PL_VRAM},
2193         {"amdgpu_gtt_mm", amdgpu_mm_dump_table, 0, (void *)TTM_PL_TT},
2194         {"amdgpu_gds_mm", amdgpu_mm_dump_table, 0, (void *)AMDGPU_PL_GDS},
2195         {"amdgpu_gws_mm", amdgpu_mm_dump_table, 0, (void *)AMDGPU_PL_GWS},
2196         {"amdgpu_oa_mm", amdgpu_mm_dump_table, 0, (void *)AMDGPU_PL_OA},
2197         {"ttm_page_pool", ttm_page_alloc_debugfs, 0, NULL},
2198 #ifdef CONFIG_SWIOTLB
2199         {"ttm_dma_page_pool", ttm_dma_page_alloc_debugfs, 0, NULL}
2200 #endif
2201 };
2202
2203 /**
2204  * amdgpu_ttm_vram_read - Linear read access to VRAM
2205  *
2206  * Accesses VRAM via MMIO for debugging purposes.
2207  */
2208 static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf,
2209                                     size_t size, loff_t *pos)
2210 {
2211         struct amdgpu_device *adev = file_inode(f)->i_private;
2212         ssize_t result = 0;
2213         int r;
2214
2215         if (size & 0x3 || *pos & 0x3)
2216                 return -EINVAL;
2217
2218         if (*pos >= adev->gmc.mc_vram_size)
2219                 return -ENXIO;
2220
2221         while (size) {
2222                 unsigned long flags;
2223                 uint32_t value;
2224
2225                 if (*pos >= adev->gmc.mc_vram_size)
2226                         return result;
2227
2228                 spin_lock_irqsave(&adev->mmio_idx_lock, flags);
2229                 WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)*pos) | 0x80000000);
2230                 WREG32_NO_KIQ(mmMM_INDEX_HI, *pos >> 31);
2231                 value = RREG32_NO_KIQ(mmMM_DATA);
2232                 spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
2233
2234                 r = put_user(value, (uint32_t *)buf);
2235                 if (r)
2236                         return r;
2237
2238                 result += 4;
2239                 buf += 4;
2240                 *pos += 4;
2241                 size -= 4;
2242         }
2243
2244         return result;
2245 }
2246
2247 /**
2248  * amdgpu_ttm_vram_write - Linear write access to VRAM
2249  *
2250  * Accesses VRAM via MMIO for debugging purposes.
2251  */
2252 static ssize_t amdgpu_ttm_vram_write(struct file *f, const char __user *buf,
2253                                     size_t size, loff_t *pos)
2254 {
2255         struct amdgpu_device *adev = file_inode(f)->i_private;
2256         ssize_t result = 0;
2257         int r;
2258
2259         if (size & 0x3 || *pos & 0x3)
2260                 return -EINVAL;
2261
2262         if (*pos >= adev->gmc.mc_vram_size)
2263                 return -ENXIO;
2264
2265         while (size) {
2266                 unsigned long flags;
2267                 uint32_t value;
2268
2269                 if (*pos >= adev->gmc.mc_vram_size)
2270                         return result;
2271
2272                 r = get_user(value, (uint32_t *)buf);
2273                 if (r)
2274                         return r;
2275
2276                 spin_lock_irqsave(&adev->mmio_idx_lock, flags);
2277                 WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)*pos) | 0x80000000);
2278                 WREG32_NO_KIQ(mmMM_INDEX_HI, *pos >> 31);
2279                 WREG32_NO_KIQ(mmMM_DATA, value);
2280                 spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
2281
2282                 result += 4;
2283                 buf += 4;
2284                 *pos += 4;
2285                 size -= 4;
2286         }
2287
2288         return result;
2289 }
2290
2291 static const struct file_operations amdgpu_ttm_vram_fops = {
2292         .owner = THIS_MODULE,
2293         .read = amdgpu_ttm_vram_read,
2294         .write = amdgpu_ttm_vram_write,
2295         .llseek = default_llseek,
2296 };
2297
2298 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
2299
2300 /**
2301  * amdgpu_ttm_gtt_read - Linear read access to GTT memory
2302  */
2303 static ssize_t amdgpu_ttm_gtt_read(struct file *f, char __user *buf,
2304                                    size_t size, loff_t *pos)
2305 {
2306         struct amdgpu_device *adev = file_inode(f)->i_private;
2307         ssize_t result = 0;
2308         int r;
2309
2310         while (size) {
2311                 loff_t p = *pos / PAGE_SIZE;
2312                 unsigned off = *pos & ~PAGE_MASK;
2313                 size_t cur_size = min_t(size_t, size, PAGE_SIZE - off);
2314                 struct page *page;
2315                 void *ptr;
2316
2317                 if (p >= adev->gart.num_cpu_pages)
2318                         return result;
2319
2320                 page = adev->gart.pages[p];
2321                 if (page) {
2322                         ptr = kmap(page);
2323                         ptr += off;
2324
2325                         r = copy_to_user(buf, ptr, cur_size);
2326                         kunmap(adev->gart.pages[p]);
2327                 } else
2328                         r = clear_user(buf, cur_size);
2329
2330                 if (r)
2331                         return -EFAULT;
2332
2333                 result += cur_size;
2334                 buf += cur_size;
2335                 *pos += cur_size;
2336                 size -= cur_size;
2337         }
2338
2339         return result;
2340 }
2341
2342 static const struct file_operations amdgpu_ttm_gtt_fops = {
2343         .owner = THIS_MODULE,
2344         .read = amdgpu_ttm_gtt_read,
2345         .llseek = default_llseek
2346 };
2347
2348 #endif
2349
2350 /**
2351  * amdgpu_iomem_read - Virtual read access to GPU mapped memory
2352  *
2353  * This function is used to read memory that has been mapped to the
2354  * GPU and the known addresses are not physical addresses but instead
2355  * bus addresses (e.g., what you'd put in an IB or ring buffer).
2356  */
2357 static ssize_t amdgpu_iomem_read(struct file *f, char __user *buf,
2358                                  size_t size, loff_t *pos)
2359 {
2360         struct amdgpu_device *adev = file_inode(f)->i_private;
2361         struct iommu_domain *dom;
2362         ssize_t result = 0;
2363         int r;
2364
2365         /* retrieve the IOMMU domain if any for this device */
2366         dom = iommu_get_domain_for_dev(adev->dev);
2367
2368         while (size) {
2369                 phys_addr_t addr = *pos & PAGE_MASK;
2370                 loff_t off = *pos & ~PAGE_MASK;
2371                 size_t bytes = PAGE_SIZE - off;
2372                 unsigned long pfn;
2373                 struct page *p;
2374                 void *ptr;
2375
2376                 bytes = bytes < size ? bytes : size;
2377
2378                 /* Translate the bus address to a physical address.  If
2379                  * the domain is NULL it means there is no IOMMU active
2380                  * and the address translation is the identity
2381                  */
2382                 addr = dom ? iommu_iova_to_phys(dom, addr) : addr;
2383
2384                 pfn = addr >> PAGE_SHIFT;
2385                 if (!pfn_valid(pfn))
2386                         return -EPERM;
2387
2388                 p = pfn_to_page(pfn);
2389                 if (p->mapping != adev->mman.bdev.dev_mapping)
2390                         return -EPERM;
2391
2392                 ptr = kmap(p);
2393                 r = copy_to_user(buf, ptr + off, bytes);
2394                 kunmap(p);
2395                 if (r)
2396                         return -EFAULT;
2397
2398                 size -= bytes;
2399                 *pos += bytes;
2400                 result += bytes;
2401         }
2402
2403         return result;
2404 }
2405
2406 /**
2407  * amdgpu_iomem_write - Virtual write access to GPU mapped memory
2408  *
2409  * This function is used to write memory that has been mapped to the
2410  * GPU and the known addresses are not physical addresses but instead
2411  * bus addresses (e.g., what you'd put in an IB or ring buffer).
2412  */
2413 static ssize_t amdgpu_iomem_write(struct file *f, const char __user *buf,
2414                                  size_t size, loff_t *pos)
2415 {
2416         struct amdgpu_device *adev = file_inode(f)->i_private;
2417         struct iommu_domain *dom;
2418         ssize_t result = 0;
2419         int r;
2420
2421         dom = iommu_get_domain_for_dev(adev->dev);
2422
2423         while (size) {
2424                 phys_addr_t addr = *pos & PAGE_MASK;
2425                 loff_t off = *pos & ~PAGE_MASK;
2426                 size_t bytes = PAGE_SIZE - off;
2427                 unsigned long pfn;
2428                 struct page *p;
2429                 void *ptr;
2430
2431                 bytes = bytes < size ? bytes : size;
2432
2433                 addr = dom ? iommu_iova_to_phys(dom, addr) : addr;
2434
2435                 pfn = addr >> PAGE_SHIFT;
2436                 if (!pfn_valid(pfn))
2437                         return -EPERM;
2438
2439                 p = pfn_to_page(pfn);
2440                 if (p->mapping != adev->mman.bdev.dev_mapping)
2441                         return -EPERM;
2442
2443                 ptr = kmap(p);
2444                 r = copy_from_user(ptr + off, buf, bytes);
2445                 kunmap(p);
2446                 if (r)
2447                         return -EFAULT;
2448
2449                 size -= bytes;
2450                 *pos += bytes;
2451                 result += bytes;
2452         }
2453
2454         return result;
2455 }
2456
2457 static const struct file_operations amdgpu_ttm_iomem_fops = {
2458         .owner = THIS_MODULE,
2459         .read = amdgpu_iomem_read,
2460         .write = amdgpu_iomem_write,
2461         .llseek = default_llseek
2462 };
2463
2464 static const struct {
2465         char *name;
2466         const struct file_operations *fops;
2467         int domain;
2468 } ttm_debugfs_entries[] = {
2469         { "amdgpu_vram", &amdgpu_ttm_vram_fops, TTM_PL_VRAM },
2470 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
2471         { "amdgpu_gtt", &amdgpu_ttm_gtt_fops, TTM_PL_TT },
2472 #endif
2473         { "amdgpu_iomem", &amdgpu_ttm_iomem_fops, TTM_PL_SYSTEM },
2474 };
2475
2476 #endif
2477
2478 static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev)
2479 {
2480 #if defined(CONFIG_DEBUG_FS)
2481         unsigned count;
2482
2483         struct drm_minor *minor = adev->ddev->primary;
2484         struct dentry *ent, *root = minor->debugfs_root;
2485
2486         for (count = 0; count < ARRAY_SIZE(ttm_debugfs_entries); count++) {
2487                 ent = debugfs_create_file(
2488                                 ttm_debugfs_entries[count].name,
2489                                 S_IFREG | S_IRUGO, root,
2490                                 adev,
2491                                 ttm_debugfs_entries[count].fops);
2492                 if (IS_ERR(ent))
2493                         return PTR_ERR(ent);
2494                 if (ttm_debugfs_entries[count].domain == TTM_PL_VRAM)
2495                         i_size_write(ent->d_inode, adev->gmc.mc_vram_size);
2496                 else if (ttm_debugfs_entries[count].domain == TTM_PL_TT)
2497                         i_size_write(ent->d_inode, adev->gmc.gart_size);
2498                 adev->mman.debugfs_entries[count] = ent;
2499         }
2500
2501         count = ARRAY_SIZE(amdgpu_ttm_debugfs_list);
2502
2503 #ifdef CONFIG_SWIOTLB
2504         if (!(adev->need_swiotlb && swiotlb_nr_tbl()))
2505                 --count;
2506 #endif
2507
2508         return amdgpu_debugfs_add_files(adev, amdgpu_ttm_debugfs_list, count);
2509 #else
2510         return 0;
2511 #endif
2512 }
2513
2514 static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev)
2515 {
2516 #if defined(CONFIG_DEBUG_FS)
2517         unsigned i;
2518
2519         for (i = 0; i < ARRAY_SIZE(ttm_debugfs_entries); i++)
2520                 debugfs_remove(adev->mman.debugfs_entries[i]);
2521 #endif
2522 }