drivers/gpu/drm/i915/gem/i915_gem_ttm.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2021 Intel Corporation
   4  */
   5
   6 #include <linux/shmem_fs.h>
   7
   8 #include <drm/ttm/ttm_bo_driver.h>
   9 #include <drm/ttm/ttm_placement.h>
  10 #include <drm/drm_buddy.h>
  11
  12 #include "i915_drv.h"
  13 #include "i915_ttm_buddy_manager.h"
  14 #include "intel_memory_region.h"
  15 #include "intel_region_ttm.h"
  16
  17 #include "gem/i915_gem_mman.h"
  18 #include "gem/i915_gem_object.h"
  19 #include "gem/i915_gem_region.h"
  20 #include "gem/i915_gem_ttm.h"
  21 #include "gem/i915_gem_ttm_move.h"
  22 #include "gem/i915_gem_ttm_pm.h"
  23 #include "gt/intel_gpu_commands.h"
  24
  25 #define I915_TTM_PRIO_PURGE     0
  26 #define I915_TTM_PRIO_NO_PAGES  1
  27 #define I915_TTM_PRIO_HAS_PAGES 2
  28 #define I915_TTM_PRIO_NEEDS_CPU_ACCESS 3
  29
  30 /*
  31  * Size of struct ttm_place vector in on-stack struct ttm_placement allocs
  32  */
  33 #define I915_TTM_MAX_PLACEMENTS INTEL_REGION_UNKNOWN
  34
  35 /**
  36  * struct i915_ttm_tt - TTM page vector with additional private information
  37  * @ttm: The base TTM page vector.
  38  * @dev: The struct device used for dma mapping and unmapping.
  39  * @cached_rsgt: The cached scatter-gather table.
  40  * @is_shmem: Set if using shmem.
  41  * @filp: The shmem file, if using shmem backend.
  42  *
  43  * Note that DMA may be going on right up to the point where the page-
  44  * vector is unpopulated in delayed destroy. Hence keep the
  45  * scatter-gather table mapped and cached up to that point. This is
  46  * different from the cached gem object io scatter-gather table which
  47  * doesn't have an associated dma mapping.
  48  */
  49 struct i915_ttm_tt {
  50         struct ttm_tt ttm;
  51         struct device *dev;
  52         struct i915_refct_sgt cached_rsgt;
  53
  54         bool is_shmem;
  55         struct file *filp;
  56 };
  57
  58 static const struct ttm_place sys_placement_flags = {
  59         .fpfn = 0,
  60         .lpfn = 0,
  61         .mem_type = I915_PL_SYSTEM,
  62         .flags = 0,
  63 };
  64
  65 static struct ttm_placement i915_sys_placement = {
  66         .num_placement = 1,
  67         .placement = &sys_placement_flags,
  68         .num_busy_placement = 1,
  69         .busy_placement = &sys_placement_flags,
  70 };
  71
  72 /**
  73  * i915_ttm_sys_placement - Return the struct ttm_placement to be
  74  * used for an object in system memory.
  75  *
  76  * Rather than making the struct extern, use this
  77  * function.
  78  *
  79  * Return: A pointer to a static variable for sys placement.
  80  */
  81 struct ttm_placement *i915_ttm_sys_placement(void)
  82 {
  83         return &i915_sys_placement;
  84 }
  85
  86 static int i915_ttm_err_to_gem(int err)
  87 {
  88         /* Fastpath */
  89         if (likely(!err))
  90                 return 0;
  91
  92         switch (err) {
  93         case -EBUSY:
  94                 /*
  95                  * TTM likes to convert -EDEADLK to -EBUSY, and wants us to
  96                  * restart the operation, since we don't record the contending
  97                  * lock. We use -EAGAIN to restart.
  98                  */
  99                 return -EAGAIN;
 100         case -ENOSPC:
 101                 /*
 102                  * Memory type / region is full, and we can't evict.
 103                  * Except possibly system, that returns -ENOMEM;
 104                  */
 105                 return -ENXIO;
 106         default:
 107                 break;
 108         }
 109
 110         return err;
 111 }
 112
 113 static enum ttm_caching
 114 i915_ttm_select_tt_caching(const struct drm_i915_gem_object *obj)
 115 {
 116         /*
 117          * Objects only allowed in system get cached cpu-mappings, or when
 118          * evicting lmem-only buffers to system for swapping. Other objects get
 119          * WC mapping for now. Even if in system.
 120          */
 121         if (obj->mm.n_placements <= 1)
 122                 return ttm_cached;
 123
 124         return ttm_write_combined;
 125 }
 126
 127 static void
 128 i915_ttm_place_from_region(const struct intel_memory_region *mr,
 129                            struct ttm_place *place,
 130                            resource_size_t offset,
 131                            resource_size_t size,
 132                            unsigned int flags)
 133 {
 134         memset(place, 0, sizeof(*place));
 135         place->mem_type = intel_region_to_ttm_type(mr);
 136
 137         if (mr->type == INTEL_MEMORY_SYSTEM)
 138                 return;
 139
 140         if (flags & I915_BO_ALLOC_CONTIGUOUS)
 141                 place->flags |= TTM_PL_FLAG_CONTIGUOUS;
 142         if (offset != I915_BO_INVALID_OFFSET) {
 143                 place->fpfn = offset >> PAGE_SHIFT;
 144                 place->lpfn = place->fpfn + (size >> PAGE_SHIFT);
 145         } else if (mr->io_size && mr->io_size < mr->total) {
 146                 if (flags & I915_BO_ALLOC_GPU_ONLY) {
 147                         place->flags |= TTM_PL_FLAG_TOPDOWN;
 148                 } else {
 149                         place->fpfn = 0;
 150                         place->lpfn = mr->io_size >> PAGE_SHIFT;
 151                 }
 152         }
 153 }
 154
 155 static void
 156 i915_ttm_placement_from_obj(const struct drm_i915_gem_object *obj,
 157                             struct ttm_place *requested,
 158                             struct ttm_place *busy,
 159                             struct ttm_placement *placement)
 160 {
 161         unsigned int num_allowed = obj->mm.n_placements;
 162         unsigned int flags = obj->flags;
 163         unsigned int i;
 164
 165         placement->num_placement = 1;
 166         i915_ttm_place_from_region(num_allowed ? obj->mm.placements[0] :
 167                                    obj->mm.region, requested, obj->bo_offset,
 168                                    obj->base.size, flags);
 169
 170         /* Cache this on object? */
 171         placement->num_busy_placement = num_allowed;
 172         for (i = 0; i < placement->num_busy_placement; ++i)
 173                 i915_ttm_place_from_region(obj->mm.placements[i], busy + i,
 174                                            obj->bo_offset, obj->base.size, flags);
 175
 176         if (num_allowed == 0) {
 177                 *busy = *requested;
 178                 placement->num_busy_placement = 1;
 179         }
 180
 181         placement->placement = requested;
 182         placement->busy_placement = busy;
 183 }
 184
 185 static int i915_ttm_tt_shmem_populate(struct ttm_device *bdev,
 186                                       struct ttm_tt *ttm,
 187                                       struct ttm_operation_ctx *ctx)
 188 {
 189         struct drm_i915_private *i915 = container_of(bdev, typeof(*i915), bdev);
 190         struct intel_memory_region *mr = i915->mm.regions[INTEL_MEMORY_SYSTEM];
 191         struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
 192         const unsigned int max_segment = i915_sg_segment_size();
 193         const size_t size = (size_t)ttm->num_pages << PAGE_SHIFT;
 194         struct file *filp = i915_tt->filp;
 195         struct sgt_iter sgt_iter;
 196         struct sg_table *st;
 197         struct page *page;
 198         unsigned long i;
 199         int err;
 200
 201         if (!filp) {
 202                 struct address_space *mapping;
 203                 gfp_t mask;
 204
 205                 filp = shmem_file_setup("i915-shmem-tt", size, VM_NORESERVE);
 206                 if (IS_ERR(filp))
 207                         return PTR_ERR(filp);
 208
 209                 mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
 210
 211                 mapping = filp->f_mapping;
 212                 mapping_set_gfp_mask(mapping, mask);
 213                 GEM_BUG_ON(!(mapping_gfp_mask(mapping) & __GFP_RECLAIM));
 214
 215                 i915_tt->filp = filp;
 216         }
 217
 218         st = &i915_tt->cached_rsgt.table;
 219         err = shmem_sg_alloc_table(i915, st, size, mr, filp->f_mapping,
 220                                    max_segment);
 221         if (err)
 222                 return err;
 223
 224         err = dma_map_sgtable(i915_tt->dev, st, DMA_BIDIRECTIONAL,
 225                               DMA_ATTR_SKIP_CPU_SYNC);
 226         if (err)
 227                 goto err_free_st;
 228
 229         i = 0;
 230         for_each_sgt_page(page, sgt_iter, st)
 231                 ttm->pages[i++] = page;
 232
 233         if (ttm->page_flags & TTM_TT_FLAG_SWAPPED)
 234                 ttm->page_flags &= ~TTM_TT_FLAG_SWAPPED;
 235
 236         return 0;
 237
 238 err_free_st:
 239         shmem_sg_free_table(st, filp->f_mapping, false, false);
 240
 241         return err;
 242 }
 243
 244 static void i915_ttm_tt_shmem_unpopulate(struct ttm_tt *ttm)
 245 {
 246         struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
 247         bool backup = ttm->page_flags & TTM_TT_FLAG_SWAPPED;
 248         struct sg_table *st = &i915_tt->cached_rsgt.table;
 249
 250         shmem_sg_free_table(st, file_inode(i915_tt->filp)->i_mapping,
 251                             backup, backup);
 252 }
 253
 254 static void i915_ttm_tt_release(struct kref *ref)
 255 {
 256         struct i915_ttm_tt *i915_tt =
 257                 container_of(ref, typeof(*i915_tt), cached_rsgt.kref);
 258         struct sg_table *st = &i915_tt->cached_rsgt.table;
 259
 260         GEM_WARN_ON(st->sgl);
 261
 262         kfree(i915_tt);
 263 }
 264
 265 static const struct i915_refct_sgt_ops tt_rsgt_ops = {
 266         .release = i915_ttm_tt_release
 267 };
 268
 269 static struct ttm_tt *i915_ttm_tt_create(struct ttm_buffer_object *bo,
 270                                          uint32_t page_flags)
 271 {
 272         struct drm_i915_private *i915 = container_of(bo->bdev, typeof(*i915),
 273                                                      bdev);
 274         struct ttm_resource_manager *man =
 275                 ttm_manager_type(bo->bdev, bo->resource->mem_type);
 276         struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
 277         unsigned long ccs_pages = 0;
 278         enum ttm_caching caching;
 279         struct i915_ttm_tt *i915_tt;
 280         int ret;
 281
 282         if (!obj)
 283                 return NULL;
 284
 285         i915_tt = kzalloc(sizeof(*i915_tt), GFP_KERNEL);
 286         if (!i915_tt)
 287                 return NULL;
 288
 289         if (obj->flags & I915_BO_ALLOC_CPU_CLEAR &&
 290             man->use_tt)
 291                 page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
 292
 293         caching = i915_ttm_select_tt_caching(obj);
 294         if (i915_gem_object_is_shrinkable(obj) && caching == ttm_cached) {
 295                 page_flags |= TTM_TT_FLAG_EXTERNAL |
 296                               TTM_TT_FLAG_EXTERNAL_MAPPABLE;
 297                 i915_tt->is_shmem = true;
 298         }
 299
 300         if (i915_gem_object_needs_ccs_pages(obj))
 301                 ccs_pages = DIV_ROUND_UP(DIV_ROUND_UP(bo->base.size,
 302                                                       NUM_BYTES_PER_CCS_BYTE),
 303                                          PAGE_SIZE);
 304
 305         ret = ttm_tt_init(&i915_tt->ttm, bo, page_flags, caching, ccs_pages);
 306         if (ret)
 307                 goto err_free;
 308
 309         __i915_refct_sgt_init(&i915_tt->cached_rsgt, bo->base.size,
 310                               &tt_rsgt_ops);
 311
 312         i915_tt->dev = obj->base.dev->dev;
 313
 314         return &i915_tt->ttm;
 315
 316 err_free:
 317         kfree(i915_tt);
 318         return NULL;
 319 }
 320
 321 static int i915_ttm_tt_populate(struct ttm_device *bdev,
 322                                 struct ttm_tt *ttm,
 323                                 struct ttm_operation_ctx *ctx)
 324 {
 325         struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
 326
 327         if (i915_tt->is_shmem)
 328                 return i915_ttm_tt_shmem_populate(bdev, ttm, ctx);
 329
 330         return ttm_pool_alloc(&bdev->pool, ttm, ctx);
 331 }
 332
 333 static void i915_ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
 334 {
 335         struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
 336         struct sg_table *st = &i915_tt->cached_rsgt.table;
 337
 338         if (st->sgl)
 339                 dma_unmap_sgtable(i915_tt->dev, st, DMA_BIDIRECTIONAL, 0);
 340
 341         if (i915_tt->is_shmem) {
 342                 i915_ttm_tt_shmem_unpopulate(ttm);
 343         } else {
 344                 sg_free_table(st);
 345                 ttm_pool_free(&bdev->pool, ttm);
 346         }
 347 }
 348
 349 static void i915_ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
 350 {
 351         struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
 352
 353         if (i915_tt->filp)
 354                 fput(i915_tt->filp);
 355
 356         ttm_tt_fini(ttm);
 357         i915_refct_sgt_put(&i915_tt->cached_rsgt);
 358 }
 359
 360 static bool i915_ttm_eviction_valuable(struct ttm_buffer_object *bo,
 361                                        const struct ttm_place *place)
 362 {
 363         struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
 364
 365         if (!obj)
 366                 return false;
 367
 368         /*
 369          * EXTERNAL objects should never be swapped out by TTM, instead we need
 370          * to handle that ourselves. TTM will already skip such objects for us,
 371          * but we would like to avoid grabbing locks for no good reason.
 372          */
 373         if (bo->ttm && bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL)
 374                 return false;
 375
 376         /* Will do for now. Our pinned objects are still on TTM's LRU lists */
 377         if (!i915_gem_object_evictable(obj))
 378                 return false;
 379
 380         return ttm_bo_eviction_valuable(bo, place);
 381 }
 382
 383 static void i915_ttm_evict_flags(struct ttm_buffer_object *bo,
 384                                  struct ttm_placement *placement)
 385 {
 386         *placement = i915_sys_placement;
 387 }
 388
 389 /**
 390  * i915_ttm_free_cached_io_rsgt - Free object cached LMEM information
 391  * @obj: The GEM object
 392  * This function frees any LMEM-related information that is cached on
 393  * the object. For example the radix tree for fast page lookup and the
 394  * cached refcounted sg-table
 395  */
 396 void i915_ttm_free_cached_io_rsgt(struct drm_i915_gem_object *obj)
 397 {
 398         struct radix_tree_iter iter;
 399         void __rcu **slot;
 400
 401         if (!obj->ttm.cached_io_rsgt)
 402                 return;
 403
 404         rcu_read_lock();
 405         radix_tree_for_each_slot(slot, &obj->ttm.get_io_page.radix, &iter, 0)
 406                 radix_tree_delete(&obj->ttm.get_io_page.radix, iter.index);
 407         rcu_read_unlock();
 408
 409         i915_refct_sgt_put(obj->ttm.cached_io_rsgt);
 410         obj->ttm.cached_io_rsgt = NULL;
 411 }
 412
 413 /**
 414  * i915_ttm_purge - Clear an object of its memory
 415  * @obj: The object
 416  *
 417  * This function is called to clear an object of it's memory when it is
 418  * marked as not needed anymore.
 419  *
 420  * Return: 0 on success, negative error code on failure.
 421  */
 422 int i915_ttm_purge(struct drm_i915_gem_object *obj)
 423 {
 424         struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
 425         struct i915_ttm_tt *i915_tt =
 426                 container_of(bo->ttm, typeof(*i915_tt), ttm);
 427         struct ttm_operation_ctx ctx = {
 428                 .interruptible = true,
 429                 .no_wait_gpu = false,
 430         };
 431         struct ttm_placement place = {};
 432         int ret;
 433
 434         if (obj->mm.madv == __I915_MADV_PURGED)
 435                 return 0;
 436
 437         ret = ttm_bo_validate(bo, &place, &ctx);
 438         if (ret)
 439                 return ret;
 440
 441         if (bo->ttm && i915_tt->filp) {
 442                 /*
 443                  * The below fput(which eventually calls shmem_truncate) might
 444                  * be delayed by worker, so when directly called to purge the
 445                  * pages(like by the shrinker) we should try to be more
 446                  * aggressive and release the pages immediately.
 447                  */
 448                 shmem_truncate_range(file_inode(i915_tt->filp),
 449                                      0, (loff_t)-1);
 450                 fput(fetch_and_zero(&i915_tt->filp));
 451         }
 452
 453         obj->write_domain = 0;
 454         obj->read_domains = 0;
 455         i915_ttm_adjust_gem_after_move(obj);
 456         i915_ttm_free_cached_io_rsgt(obj);
 457         obj->mm.madv = __I915_MADV_PURGED;
 458
 459         return 0;
 460 }
 461
 462 static int i915_ttm_shrink(struct drm_i915_gem_object *obj, unsigned int flags)
 463 {
 464         struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
 465         struct i915_ttm_tt *i915_tt =
 466                 container_of(bo->ttm, typeof(*i915_tt), ttm);
 467         struct ttm_operation_ctx ctx = {
 468                 .interruptible = true,
 469                 .no_wait_gpu = flags & I915_GEM_OBJECT_SHRINK_NO_GPU_WAIT,
 470         };
 471         struct ttm_placement place = {};
 472         int ret;
 473
 474         if (!bo->ttm || bo->resource->mem_type != TTM_PL_SYSTEM)
 475                 return 0;
 476
 477         GEM_BUG_ON(!i915_tt->is_shmem);
 478
 479         if (!i915_tt->filp)
 480                 return 0;
 481
 482         ret = ttm_bo_wait_ctx(bo, &ctx);
 483         if (ret)
 484                 return ret;
 485
 486         switch (obj->mm.madv) {
 487         case I915_MADV_DONTNEED:
 488                 return i915_ttm_purge(obj);
 489         case __I915_MADV_PURGED:
 490                 return 0;
 491         }
 492
 493         if (bo->ttm->page_flags & TTM_TT_FLAG_SWAPPED)
 494                 return 0;
 495
 496         bo->ttm->page_flags |= TTM_TT_FLAG_SWAPPED;
 497         ret = ttm_bo_validate(bo, &place, &ctx);
 498         if (ret) {
 499                 bo->ttm->page_flags &= ~TTM_TT_FLAG_SWAPPED;
 500                 return ret;
 501         }
 502
 503         if (flags & I915_GEM_OBJECT_SHRINK_WRITEBACK)
 504                 __shmem_writeback(obj->base.size, i915_tt->filp->f_mapping);
 505
 506         return 0;
 507 }
 508
 509 static void i915_ttm_delete_mem_notify(struct ttm_buffer_object *bo)
 510 {
 511         struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
 512
 513         if (likely(obj)) {
 514                 __i915_gem_object_pages_fini(obj);
 515                 i915_ttm_free_cached_io_rsgt(obj);
 516         }
 517 }
 518
 519 static struct i915_refct_sgt *i915_ttm_tt_get_st(struct ttm_tt *ttm)
 520 {
 521         struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
 522         struct sg_table *st;
 523         int ret;
 524
 525         if (i915_tt->cached_rsgt.table.sgl)
 526                 return i915_refct_sgt_get(&i915_tt->cached_rsgt);
 527
 528         st = &i915_tt->cached_rsgt.table;
 529         ret = sg_alloc_table_from_pages_segment(st,
 530                         ttm->pages, ttm->num_pages,
 531                         0, (unsigned long)ttm->num_pages << PAGE_SHIFT,
 532                         i915_sg_segment_size(), GFP_KERNEL);
 533         if (ret) {
 534                 st->sgl = NULL;
 535                 return ERR_PTR(ret);
 536         }
 537
 538         ret = dma_map_sgtable(i915_tt->dev, st, DMA_BIDIRECTIONAL, 0);
 539         if (ret) {
 540                 sg_free_table(st);
 541                 return ERR_PTR(ret);
 542         }
 543
 544         return i915_refct_sgt_get(&i915_tt->cached_rsgt);
 545 }
 546
 547 /**
 548  * i915_ttm_resource_get_st - Get a refcounted sg-table pointing to the
 549  * resource memory
 550  * @obj: The GEM object used for sg-table caching
 551  * @res: The struct ttm_resource for which an sg-table is requested.
 552  *
 553  * This function returns a refcounted sg-table representing the memory
 554  * pointed to by @res. If @res is the object's current resource it may also
 555  * cache the sg_table on the object or attempt to access an already cached
 556  * sg-table. The refcounted sg-table needs to be put when no-longer in use.
 557  *
 558  * Return: A valid pointer to a struct i915_refct_sgt or error pointer on
 559  * failure.
 560  */
 561 struct i915_refct_sgt *
 562 i915_ttm_resource_get_st(struct drm_i915_gem_object *obj,
 563                          struct ttm_resource *res)
 564 {
 565         struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
 566         u32 page_alignment;
 567
 568         if (!i915_ttm_gtt_binds_lmem(res))
 569                 return i915_ttm_tt_get_st(bo->ttm);
 570
 571         page_alignment = bo->page_alignment << PAGE_SHIFT;
 572         if (!page_alignment)
 573                 page_alignment = obj->mm.region->min_page_size;
 574
 575         /*
 576          * If CPU mapping differs, we need to add the ttm_tt pages to
 577          * the resulting st. Might make sense for GGTT.
 578          */
 579         GEM_WARN_ON(!i915_ttm_cpu_maps_iomem(res));
 580         if (bo->resource == res) {
 581                 if (!obj->ttm.cached_io_rsgt) {
 582                         struct i915_refct_sgt *rsgt;
 583
 584                         rsgt = intel_region_ttm_resource_to_rsgt(obj->mm.region,
 585                                                                  res,
 586                                                                  page_alignment);
 587                         if (IS_ERR(rsgt))
 588                                 return rsgt;
 589
 590                         obj->ttm.cached_io_rsgt = rsgt;
 591                 }
 592                 return i915_refct_sgt_get(obj->ttm.cached_io_rsgt);
 593         }
 594
 595         return intel_region_ttm_resource_to_rsgt(obj->mm.region, res,
 596                                                  page_alignment);
 597 }
 598
 599 static int i915_ttm_truncate(struct drm_i915_gem_object *obj)
 600 {
 601         struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
 602         int err;
 603
 604         WARN_ON_ONCE(obj->mm.madv == I915_MADV_WILLNEED);
 605
 606         err = i915_ttm_move_notify(bo);
 607         if (err)
 608                 return err;
 609
 610         return i915_ttm_purge(obj);
 611 }
 612
 613 static void i915_ttm_swap_notify(struct ttm_buffer_object *bo)
 614 {
 615         struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
 616         int ret;
 617
 618         if (!obj)
 619                 return;
 620
 621         ret = i915_ttm_move_notify(bo);
 622         GEM_WARN_ON(ret);
 623         GEM_WARN_ON(obj->ttm.cached_io_rsgt);
 624         if (!ret && obj->mm.madv != I915_MADV_WILLNEED)
 625                 i915_ttm_purge(obj);
 626 }
 627
 628 /**
 629  * i915_ttm_resource_mappable - Return true if the ttm resource is CPU
 630  * accessible.
 631  * @res: The TTM resource to check.
 632  *
 633  * This is interesting on small-BAR systems where we may encounter lmem objects
 634  * that can't be accessed via the CPU.
 635  */
 636 bool i915_ttm_resource_mappable(struct ttm_resource *res)
 637 {
 638         struct i915_ttm_buddy_resource *bman_res = to_ttm_buddy_resource(res);
 639
 640         if (!i915_ttm_cpu_maps_iomem(res))
 641                 return true;
 642
 643         return bman_res->used_visible_size == bman_res->base.num_pages;
 644 }
 645
 646 static int i915_ttm_io_mem_reserve(struct ttm_device *bdev, struct ttm_resource *mem)
 647 {
 648         struct drm_i915_gem_object *obj = i915_ttm_to_gem(mem->bo);
 649         bool unknown_state;
 650
 651         if (!obj)
 652                 return -EINVAL;
 653
 654         if (!kref_get_unless_zero(&obj->base.refcount))
 655                 return -EINVAL;
 656
 657         assert_object_held(obj);
 658
 659         unknown_state = i915_gem_object_has_unknown_state(obj);
 660         i915_gem_object_put(obj);
 661         if (unknown_state)
 662                 return -EINVAL;
 663
 664         if (!i915_ttm_cpu_maps_iomem(mem))
 665                 return 0;
 666
 667         if (!i915_ttm_resource_mappable(mem))
 668                 return -EINVAL;
 669
 670         mem->bus.caching = ttm_write_combined;
 671         mem->bus.is_iomem = true;
 672
 673         return 0;
 674 }
 675
 676 static unsigned long i915_ttm_io_mem_pfn(struct ttm_buffer_object *bo,
 677                                          unsigned long page_offset)
 678 {
 679         struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
 680         struct scatterlist *sg;
 681         unsigned long base;
 682         unsigned int ofs;
 683
 684         GEM_BUG_ON(!obj);
 685         GEM_WARN_ON(bo->ttm);
 686
 687         base = obj->mm.region->iomap.base - obj->mm.region->region.start;
 688         sg = __i915_gem_object_get_sg(obj, &obj->ttm.get_io_page, page_offset, &ofs, true);
 689
 690         return ((base + sg_dma_address(sg)) >> PAGE_SHIFT) + ofs;
 691 }
 692
 693 /*
 694  * All callbacks need to take care not to downcast a struct ttm_buffer_object
 695  * without checking its subclass, since it might be a TTM ghost object.
 696  */
 697 static struct ttm_device_funcs i915_ttm_bo_driver = {
 698         .ttm_tt_create = i915_ttm_tt_create,
 699         .ttm_tt_populate = i915_ttm_tt_populate,
 700         .ttm_tt_unpopulate = i915_ttm_tt_unpopulate,
 701         .ttm_tt_destroy = i915_ttm_tt_destroy,
 702         .eviction_valuable = i915_ttm_eviction_valuable,
 703         .evict_flags = i915_ttm_evict_flags,
 704         .move = i915_ttm_move,
 705         .swap_notify = i915_ttm_swap_notify,
 706         .delete_mem_notify = i915_ttm_delete_mem_notify,
 707         .io_mem_reserve = i915_ttm_io_mem_reserve,
 708         .io_mem_pfn = i915_ttm_io_mem_pfn,
 709 };
 710
 711 /**
 712  * i915_ttm_driver - Return a pointer to the TTM device funcs
 713  *
 714  * Return: Pointer to statically allocated TTM device funcs.
 715  */
 716 struct ttm_device_funcs *i915_ttm_driver(void)
 717 {
 718         return &i915_ttm_bo_driver;
 719 }
 720
 721 static int __i915_ttm_get_pages(struct drm_i915_gem_object *obj,
 722                                 struct ttm_placement *placement)
 723 {
 724         struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
 725         struct ttm_operation_ctx ctx = {
 726                 .interruptible = true,
 727                 .no_wait_gpu = false,
 728         };
 729         int real_num_busy;
 730         int ret;
 731
 732         /* First try only the requested placement. No eviction. */
 733         real_num_busy = fetch_and_zero(&placement->num_busy_placement);
 734         ret = ttm_bo_validate(bo, placement, &ctx);
 735         if (ret) {
 736                 ret = i915_ttm_err_to_gem(ret);
 737                 /*
 738                  * Anything that wants to restart the operation gets to
 739                  * do that.
 740                  */
 741                 if (ret == -EDEADLK || ret == -EINTR || ret == -ERESTARTSYS ||
 742                     ret == -EAGAIN)
 743                         return ret;
 744
 745                 /*
 746                  * If the initial attempt fails, allow all accepted placements,
 747                  * evicting if necessary.
 748                  */
 749                 placement->num_busy_placement = real_num_busy;
 750                 ret = ttm_bo_validate(bo, placement, &ctx);
 751                 if (ret)
 752                         return i915_ttm_err_to_gem(ret);
 753         }
 754
 755         if (bo->ttm && !ttm_tt_is_populated(bo->ttm)) {
 756                 ret = ttm_tt_populate(bo->bdev, bo->ttm, &ctx);
 757                 if (ret)
 758                         return ret;
 759
 760                 i915_ttm_adjust_domains_after_move(obj);
 761                 i915_ttm_adjust_gem_after_move(obj);
 762         }
 763
 764         if (!i915_gem_object_has_pages(obj)) {
 765                 struct i915_refct_sgt *rsgt =
 766                         i915_ttm_resource_get_st(obj, bo->resource);
 767
 768                 if (IS_ERR(rsgt))
 769                         return PTR_ERR(rsgt);
 770
 771                 GEM_BUG_ON(obj->mm.rsgt);
 772                 obj->mm.rsgt = rsgt;
 773                 __i915_gem_object_set_pages(obj, &rsgt->table,
 774                                             i915_sg_dma_sizes(rsgt->table.sgl));
 775         }
 776
 777         GEM_BUG_ON(bo->ttm && ((obj->base.size >> PAGE_SHIFT) < bo->ttm->num_pages));
 778         i915_ttm_adjust_lru(obj);
 779         return ret;
 780 }
 781
 782 static int i915_ttm_get_pages(struct drm_i915_gem_object *obj)
 783 {
 784         struct ttm_place requested, busy[I915_TTM_MAX_PLACEMENTS];
 785         struct ttm_placement placement;
 786
 787         GEM_BUG_ON(obj->mm.n_placements > I915_TTM_MAX_PLACEMENTS);
 788
 789         /* Move to the requested placement. */
 790         i915_ttm_placement_from_obj(obj, &requested, busy, &placement);
 791
 792         return __i915_ttm_get_pages(obj, &placement);
 793 }
 794
 795 /**
 796  * DOC: Migration vs eviction
 797  *
 798  * GEM migration may not be the same as TTM migration / eviction. If
 799  * the TTM core decides to evict an object it may be evicted to a
 800  * TTM memory type that is not in the object's allowable GEM regions, or
 801  * in fact theoretically to a TTM memory type that doesn't correspond to
 802  * a GEM memory region. In that case the object's GEM region is not
 803  * updated, and the data is migrated back to the GEM region at
 804  * get_pages time. TTM may however set up CPU ptes to the object even
 805  * when it is evicted.
 806  * Gem forced migration using the i915_ttm_migrate() op, is allowed even
 807  * to regions that are not in the object's list of allowable placements.
 808  */
 809 static int __i915_ttm_migrate(struct drm_i915_gem_object *obj,
 810                               struct intel_memory_region *mr,
 811                               unsigned int flags)
 812 {
 813         struct ttm_place requested;
 814         struct ttm_placement placement;
 815         int ret;
 816
 817         i915_ttm_place_from_region(mr, &requested, obj->bo_offset,
 818                                    obj->base.size, flags);
 819         placement.num_placement = 1;
 820         placement.num_busy_placement = 1;
 821         placement.placement = &requested;
 822         placement.busy_placement = &requested;
 823
 824         ret = __i915_ttm_get_pages(obj, &placement);
 825         if (ret)
 826                 return ret;
 827
 828         /*
 829          * Reinitialize the region bindings. This is primarily
 830          * required for objects where the new region is not in
 831          * its allowable placements.
 832          */
 833         if (obj->mm.region != mr) {
 834                 i915_gem_object_release_memory_region(obj);
 835                 i915_gem_object_init_memory_region(obj, mr);
 836         }
 837
 838         return 0;
 839 }
 840
 841 static int i915_ttm_migrate(struct drm_i915_gem_object *obj,
 842                             struct intel_memory_region *mr)
 843 {
 844         return __i915_ttm_migrate(obj, mr, obj->flags);
 845 }
 846
 847 static void i915_ttm_put_pages(struct drm_i915_gem_object *obj,
 848                                struct sg_table *st)
 849 {
 850         /*
 851          * We're currently not called from a shrinker, so put_pages()
 852          * typically means the object is about to destroyed, or called
 853          * from move_notify(). So just avoid doing much for now.
 854          * If the object is not destroyed next, The TTM eviction logic
 855          * and shrinkers will move it out if needed.
 856          */
 857
 858         if (obj->mm.rsgt)
 859                 i915_refct_sgt_put(fetch_and_zero(&obj->mm.rsgt));
 860 }
 861
 862 /**
 863  * i915_ttm_adjust_lru - Adjust an object's position on relevant LRU lists.
 864  * @obj: The object
 865  */
 866 void i915_ttm_adjust_lru(struct drm_i915_gem_object *obj)
 867 {
 868         struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
 869         struct i915_ttm_tt *i915_tt =
 870                 container_of(bo->ttm, typeof(*i915_tt), ttm);
 871         bool shrinkable =
 872                 bo->ttm && i915_tt->filp && ttm_tt_is_populated(bo->ttm);
 873
 874         /*
 875          * Don't manipulate the TTM LRUs while in TTM bo destruction.
 876          * We're called through i915_ttm_delete_mem_notify().
 877          */
 878         if (!kref_read(&bo->kref))
 879                 return;
 880
 881         /*
 882          * We skip managing the shrinker LRU in set_pages() and just manage
 883          * everything here. This does at least solve the issue with having
 884          * temporary shmem mappings(like with evicted lmem) not being visible to
 885          * the shrinker. Only our shmem objects are shrinkable, everything else
 886          * we keep as unshrinkable.
 887          *
 888          * To make sure everything plays nice we keep an extra shrink pin in TTM
 889          * if the underlying pages are not currently shrinkable. Once we release
 890          * our pin, like when the pages are moved to shmem, the pages will then
 891          * be added to the shrinker LRU, assuming the caller isn't also holding
 892          * a pin.
 893          *
 894          * TODO: consider maybe also bumping the shrinker list here when we have
 895          * already unpinned it, which should give us something more like an LRU.
 896          *
 897          * TODO: There is a small window of opportunity for this function to
 898          * get called from eviction after we've dropped the last GEM refcount,
 899          * but before the TTM deleted flag is set on the object. Avoid
 900          * adjusting the shrinker list in such cases, since the object is
 901          * not available to the shrinker anyway due to its zero refcount.
 902          * To fix this properly we should move to a TTM shrinker LRU list for
 903          * these objects.
 904          */
 905         if (kref_get_unless_zero(&obj->base.refcount)) {
 906                 if (shrinkable != obj->mm.ttm_shrinkable) {
 907                         if (shrinkable) {
 908                                 if (obj->mm.madv == I915_MADV_WILLNEED)
 909                                         __i915_gem_object_make_shrinkable(obj);
 910                                 else
 911                                         __i915_gem_object_make_purgeable(obj);
 912                         } else {
 913                                 i915_gem_object_make_unshrinkable(obj);
 914                         }
 915
 916                         obj->mm.ttm_shrinkable = shrinkable;
 917                 }
 918                 i915_gem_object_put(obj);
 919         }
 920
 921         /*
 922          * Put on the correct LRU list depending on the MADV status
 923          */
 924         spin_lock(&bo->bdev->lru_lock);
 925         if (shrinkable) {
 926                 /* Try to keep shmem_tt from being considered for shrinking. */
 927                 bo->priority = TTM_MAX_BO_PRIORITY - 1;
 928         } else if (obj->mm.madv != I915_MADV_WILLNEED) {
 929                 bo->priority = I915_TTM_PRIO_PURGE;
 930         } else if (!i915_gem_object_has_pages(obj)) {
 931                 bo->priority = I915_TTM_PRIO_NO_PAGES;
 932         } else {
 933                 struct ttm_resource_manager *man =
 934                         ttm_manager_type(bo->bdev, bo->resource->mem_type);
 935
 936                 /*
 937                  * If we need to place an LMEM resource which doesn't need CPU
 938                  * access then we should try not to victimize mappable objects
 939                  * first, since we likely end up stealing more of the mappable
 940                  * portion. And likewise when we try to find space for a mappble
 941                  * object, we know not to ever victimize objects that don't
 942                  * occupy any mappable pages.
 943                  */
 944                 if (i915_ttm_cpu_maps_iomem(bo->resource) &&
 945                     i915_ttm_buddy_man_visible_size(man) < man->size &&
 946                     !(obj->flags & I915_BO_ALLOC_GPU_ONLY))
 947                         bo->priority = I915_TTM_PRIO_NEEDS_CPU_ACCESS;
 948                 else
 949                         bo->priority = I915_TTM_PRIO_HAS_PAGES;
 950         }
 951
 952         ttm_bo_move_to_lru_tail(bo);
 953         spin_unlock(&bo->bdev->lru_lock);
 954 }
 955
 956 /*
 957  * TTM-backed gem object destruction requires some clarification.
 958  * Basically we have two possibilities here. We can either rely on the
 959  * i915 delayed destruction and put the TTM object when the object
 960  * is idle. This would be detected by TTM which would bypass the
 961  * TTM delayed destroy handling. The other approach is to put the TTM
 962  * object early and rely on the TTM destroyed handling, and then free
 963  * the leftover parts of the GEM object once TTM's destroyed list handling is
 964  * complete. For now, we rely on the latter for two reasons:
 965  * a) TTM can evict an object even when it's on the delayed destroy list,
 966  * which in theory allows for complete eviction.
 967  * b) There is work going on in TTM to allow freeing an object even when
 968  * it's not idle, and using the TTM destroyed list handling could help us
 969  * benefit from that.
 970  */
 971 static void i915_ttm_delayed_free(struct drm_i915_gem_object *obj)
 972 {
 973         GEM_BUG_ON(!obj->ttm.created);
 974
 975         ttm_bo_put(i915_gem_to_ttm(obj));
 976 }
 977
 978 static vm_fault_t vm_fault_ttm(struct vm_fault *vmf)
 979 {
 980         struct vm_area_struct *area = vmf->vma;
 981         struct ttm_buffer_object *bo = area->vm_private_data;
 982         struct drm_device *dev = bo->base.dev;
 983         struct drm_i915_gem_object *obj;
 984         vm_fault_t ret;
 985         int idx;
 986
 987         obj = i915_ttm_to_gem(bo);
 988         if (!obj)
 989                 return VM_FAULT_SIGBUS;
 990
 991         /* Sanity check that we allow writing into this object */
 992         if (unlikely(i915_gem_object_is_readonly(obj) &&
 993                      area->vm_flags & VM_WRITE))
 994                 return VM_FAULT_SIGBUS;
 995
 996         ret = ttm_bo_vm_reserve(bo, vmf);
 997         if (ret)
 998                 return ret;
 999
1000         if (obj->mm.madv != I915_MADV_WILLNEED) {
1001                 dma_resv_unlock(bo->base.resv);
1002                 return VM_FAULT_SIGBUS;
1003         }
1004
1005         if (!i915_ttm_resource_mappable(bo->resource)) {
1006                 int err = -ENODEV;
1007                 int i;
1008
1009                 for (i = 0; i < obj->mm.n_placements; i++) {
1010                         struct intel_memory_region *mr = obj->mm.placements[i];
1011                         unsigned int flags;
1012
1013                         if (!mr->io_size && mr->type != INTEL_MEMORY_SYSTEM)
1014                                 continue;
1015
1016                         flags = obj->flags;
1017                         flags &= ~I915_BO_ALLOC_GPU_ONLY;
1018                         err = __i915_ttm_migrate(obj, mr, flags);
1019                         if (!err)
1020                                 break;
1021                 }
1022
1023                 if (err) {
1024                         drm_dbg(dev, "Unable to make resource CPU accessible\n");
1025                         dma_resv_unlock(bo->base.resv);
1026                         return VM_FAULT_SIGBUS;
1027                 }
1028         }
1029
1030         if (drm_dev_enter(dev, &idx)) {
1031                 ret = ttm_bo_vm_fault_reserved(vmf, vmf->vma->vm_page_prot,
1032                                                TTM_BO_VM_NUM_PREFAULT);
1033                 drm_dev_exit(idx);
1034         } else {
1035                 ret = ttm_bo_vm_dummy_page(vmf, vmf->vma->vm_page_prot);
1036         }
1037         if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
1038                 return ret;
1039
1040         i915_ttm_adjust_lru(obj);
1041
1042         dma_resv_unlock(bo->base.resv);
1043         return ret;
1044 }
1045
1046 static int
1047 vm_access_ttm(struct vm_area_struct *area, unsigned long addr,
1048               void *buf, int len, int write)
1049 {
1050         struct drm_i915_gem_object *obj =
1051                 i915_ttm_to_gem(area->vm_private_data);
1052
1053         if (i915_gem_object_is_readonly(obj) && write)
1054                 return -EACCES;
1055
1056         return ttm_bo_vm_access(area, addr, buf, len, write);
1057 }
1058
1059 static void ttm_vm_open(struct vm_area_struct *vma)
1060 {
1061         struct drm_i915_gem_object *obj =
1062                 i915_ttm_to_gem(vma->vm_private_data);
1063
1064         GEM_BUG_ON(!obj);
1065         i915_gem_object_get(obj);
1066 }
1067
1068 static void ttm_vm_close(struct vm_area_struct *vma)
1069 {
1070         struct drm_i915_gem_object *obj =
1071                 i915_ttm_to_gem(vma->vm_private_data);
1072
1073         GEM_BUG_ON(!obj);
1074         i915_gem_object_put(obj);
1075 }
1076
1077 static const struct vm_operations_struct vm_ops_ttm = {
1078         .fault = vm_fault_ttm,
1079         .access = vm_access_ttm,
1080         .open = ttm_vm_open,
1081         .close = ttm_vm_close,
1082 };
1083
1084 static u64 i915_ttm_mmap_offset(struct drm_i915_gem_object *obj)
1085 {
1086         /* The ttm_bo must be allocated with I915_BO_ALLOC_USER */
1087         GEM_BUG_ON(!drm_mm_node_allocated(&obj->base.vma_node.vm_node));
1088
1089         return drm_vma_node_offset_addr(&obj->base.vma_node);
1090 }
1091
1092 static void i915_ttm_unmap_virtual(struct drm_i915_gem_object *obj)
1093 {
1094         ttm_bo_unmap_virtual(i915_gem_to_ttm(obj));
1095 }
1096
1097 static const struct drm_i915_gem_object_ops i915_gem_ttm_obj_ops = {
1098         .name = "i915_gem_object_ttm",
1099         .flags = I915_GEM_OBJECT_IS_SHRINKABLE |
1100                  I915_GEM_OBJECT_SELF_MANAGED_SHRINK_LIST,
1101
1102         .get_pages = i915_ttm_get_pages,
1103         .put_pages = i915_ttm_put_pages,
1104         .truncate = i915_ttm_truncate,
1105         .shrink = i915_ttm_shrink,
1106
1107         .adjust_lru = i915_ttm_adjust_lru,
1108         .delayed_free = i915_ttm_delayed_free,
1109         .migrate = i915_ttm_migrate,
1110
1111         .mmap_offset = i915_ttm_mmap_offset,
1112         .unmap_virtual = i915_ttm_unmap_virtual,
1113         .mmap_ops = &vm_ops_ttm,
1114 };
1115
1116 void i915_ttm_bo_destroy(struct ttm_buffer_object *bo)
1117 {
1118         struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
1119
1120         i915_gem_object_release_memory_region(obj);
1121         mutex_destroy(&obj->ttm.get_io_page.lock);
1122
1123         if (obj->ttm.created) {
1124                 /*
1125                  * We freely manage the shrinker LRU outide of the mm.pages life
1126                  * cycle. As a result when destroying the object we should be
1127                  * extra paranoid and ensure we remove it from the LRU, before
1128                  * we free the object.
1129                  *
1130                  * Touching the ttm_shrinkable outside of the object lock here
1131                  * should be safe now that the last GEM object ref was dropped.
1132                  */
1133                 if (obj->mm.ttm_shrinkable)
1134                         i915_gem_object_make_unshrinkable(obj);
1135
1136                 i915_ttm_backup_free(obj);
1137
1138                 /* This releases all gem object bindings to the backend. */
1139                 __i915_gem_free_object(obj);
1140
1141                 call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
1142         } else {
1143                 __i915_gem_object_fini(obj);
1144         }
1145 }
1146
1147 /**
1148  * __i915_gem_ttm_object_init - Initialize a ttm-backed i915 gem object
1149  * @mem: The initial memory region for the object.
1150  * @obj: The gem object.
1151  * @size: Object size in bytes.
1152  * @flags: gem object flags.
1153  *
1154  * Return: 0 on success, negative error code on failure.
1155  */
1156 int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
1157                                struct drm_i915_gem_object *obj,
1158                                resource_size_t offset,
1159                                resource_size_t size,
1160                                resource_size_t page_size,
1161                                unsigned int flags)
1162 {
1163         static struct lock_class_key lock_class;
1164         struct drm_i915_private *i915 = mem->i915;
1165         struct ttm_operation_ctx ctx = {
1166                 .interruptible = true,
1167                 .no_wait_gpu = false,
1168         };
1169         enum ttm_bo_type bo_type;
1170         int ret;
1171
1172         drm_gem_private_object_init(&i915->drm, &obj->base, size);
1173         i915_gem_object_init(obj, &i915_gem_ttm_obj_ops, &lock_class, flags);
1174
1175         obj->bo_offset = offset;
1176
1177         /* Don't put on a region list until we're either locked or fully initialized. */
1178         obj->mm.region = mem;
1179         INIT_LIST_HEAD(&obj->mm.region_link);
1180
1181         INIT_RADIX_TREE(&obj->ttm.get_io_page.radix, GFP_KERNEL | __GFP_NOWARN);
1182         mutex_init(&obj->ttm.get_io_page.lock);
1183         bo_type = (obj->flags & I915_BO_ALLOC_USER) ? ttm_bo_type_device :
1184                 ttm_bo_type_kernel;
1185
1186         obj->base.vma_node.driver_private = i915_gem_to_ttm(obj);
1187
1188         /* Forcing the page size is kernel internal only */
1189         GEM_BUG_ON(page_size && obj->mm.n_placements);
1190
1191         /*
1192          * Keep an extra shrink pin to prevent the object from being made
1193          * shrinkable too early. If the ttm_tt is ever allocated in shmem, we
1194          * drop the pin. The TTM backend manages the shrinker LRU itself,
1195          * outside of the normal mm.pages life cycle.
1196          */
1197         i915_gem_object_make_unshrinkable(obj);
1198
1199         /*
1200          * If this function fails, it will call the destructor, but
1201          * our caller still owns the object. So no freeing in the
1202          * destructor until obj->ttm.created is true.
1203          * Similarly, in delayed_destroy, we can't call ttm_bo_put()
1204          * until successful initialization.
1205          */
1206         ret = ttm_bo_init_reserved(&i915->bdev, i915_gem_to_ttm(obj), bo_type,
1207                                    &i915_sys_placement, page_size >> PAGE_SHIFT,
1208                                    &ctx, NULL, NULL, i915_ttm_bo_destroy);
1209         if (ret)
1210                 return i915_ttm_err_to_gem(ret);
1211
1212         obj->ttm.created = true;
1213         i915_gem_object_release_memory_region(obj);
1214         i915_gem_object_init_memory_region(obj, mem);
1215         i915_ttm_adjust_domains_after_move(obj);
1216         i915_ttm_adjust_gem_after_move(obj);
1217         i915_gem_object_unlock(obj);
1218
1219         return 0;
1220 }
1221
1222 static const struct intel_memory_region_ops ttm_system_region_ops = {
1223         .init_object = __i915_gem_ttm_object_init,
1224         .release = intel_region_ttm_fini,
1225 };
1226
1227 struct intel_memory_region *
1228 i915_gem_ttm_system_setup(struct drm_i915_private *i915,
1229                           u16 type, u16 instance)
1230 {
1231         struct intel_memory_region *mr;
1232
1233         mr = intel_memory_region_create(i915, 0,
1234                                         totalram_pages() << PAGE_SHIFT,
1235                                         PAGE_SIZE, 0, 0,
1236                                         type, instance,
1237                                         &ttm_system_region_ops);
1238         if (IS_ERR(mr))
1239                 return mr;
1240
1241         intel_memory_region_set_name(mr, "system-ttm");
1242         return mr;
1243 }