drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /**************************************************************************
   3  *
   4  * Copyright 2009-2015 VMware, Inc., Palo Alto, CA., USA
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "vmwgfx_drv.h"
  29 #include <drm/ttm/ttm_bo_driver.h>
  30 #include <drm/ttm/ttm_placement.h>
  31
  32 static const struct ttm_place vram_placement_flags = {
  33         .fpfn = 0,
  34         .lpfn = 0,
  35         .mem_type = TTM_PL_VRAM,
  36         .flags = 0
  37 };
  38
  39 static const struct ttm_place sys_placement_flags = {
  40         .fpfn = 0,
  41         .lpfn = 0,
  42         .mem_type = TTM_PL_SYSTEM,
  43         .flags = 0
  44 };
  45
  46 static const struct ttm_place gmr_placement_flags = {
  47         .fpfn = 0,
  48         .lpfn = 0,
  49         .mem_type = VMW_PL_GMR,
  50         .flags = 0
  51 };
  52
  53 static const struct ttm_place mob_placement_flags = {
  54         .fpfn = 0,
  55         .lpfn = 0,
  56         .mem_type = VMW_PL_MOB,
  57         .flags = 0
  58 };
  59
  60 struct ttm_placement vmw_vram_placement = {
  61         .num_placement = 1,
  62         .placement = &vram_placement_flags,
  63         .num_busy_placement = 1,
  64         .busy_placement = &vram_placement_flags
  65 };
  66
  67 static const struct ttm_place vram_gmr_placement_flags[] = {
  68         {
  69                 .fpfn = 0,
  70                 .lpfn = 0,
  71                 .mem_type = TTM_PL_VRAM,
  72                 .flags = 0
  73         }, {
  74                 .fpfn = 0,
  75                 .lpfn = 0,
  76                 .mem_type = VMW_PL_GMR,
  77                 .flags = 0
  78         }
  79 };
  80
  81 static const struct ttm_place gmr_vram_placement_flags[] = {
  82         {
  83                 .fpfn = 0,
  84                 .lpfn = 0,
  85                 .mem_type = VMW_PL_GMR,
  86                 .flags = 0
  87         }, {
  88                 .fpfn = 0,
  89                 .lpfn = 0,
  90                 .mem_type = TTM_PL_VRAM,
  91                 .flags = 0
  92         }
  93 };
  94
  95 struct ttm_placement vmw_vram_gmr_placement = {
  96         .num_placement = 2,
  97         .placement = vram_gmr_placement_flags,
  98         .num_busy_placement = 1,
  99         .busy_placement = &gmr_placement_flags
 100 };
 101
 102 struct ttm_placement vmw_vram_sys_placement = {
 103         .num_placement = 1,
 104         .placement = &vram_placement_flags,
 105         .num_busy_placement = 1,
 106         .busy_placement = &sys_placement_flags
 107 };
 108
 109 struct ttm_placement vmw_sys_placement = {
 110         .num_placement = 1,
 111         .placement = &sys_placement_flags,
 112         .num_busy_placement = 1,
 113         .busy_placement = &sys_placement_flags
 114 };
 115
 116 static const struct ttm_place evictable_placement_flags[] = {
 117         {
 118                 .fpfn = 0,
 119                 .lpfn = 0,
 120                 .mem_type = TTM_PL_SYSTEM,
 121                 .flags = 0
 122         }, {
 123                 .fpfn = 0,
 124                 .lpfn = 0,
 125                 .mem_type = TTM_PL_VRAM,
 126                 .flags = 0
 127         }, {
 128                 .fpfn = 0,
 129                 .lpfn = 0,
 130                 .mem_type = VMW_PL_GMR,
 131                 .flags = 0
 132         }, {
 133                 .fpfn = 0,
 134                 .lpfn = 0,
 135                 .mem_type = VMW_PL_MOB,
 136                 .flags = 0
 137         }
 138 };
 139
 140 static const struct ttm_place nonfixed_placement_flags[] = {
 141         {
 142                 .fpfn = 0,
 143                 .lpfn = 0,
 144                 .mem_type = TTM_PL_SYSTEM,
 145                 .flags = 0
 146         }, {
 147                 .fpfn = 0,
 148                 .lpfn = 0,
 149                 .mem_type = VMW_PL_GMR,
 150                 .flags = 0
 151         }, {
 152                 .fpfn = 0,
 153                 .lpfn = 0,
 154                 .mem_type = VMW_PL_MOB,
 155                 .flags = 0
 156         }
 157 };
 158
 159 struct ttm_placement vmw_evictable_placement = {
 160         .num_placement = 4,
 161         .placement = evictable_placement_flags,
 162         .num_busy_placement = 1,
 163         .busy_placement = &sys_placement_flags
 164 };
 165
 166 struct ttm_placement vmw_srf_placement = {
 167         .num_placement = 1,
 168         .num_busy_placement = 2,
 169         .placement = &gmr_placement_flags,
 170         .busy_placement = gmr_vram_placement_flags
 171 };
 172
 173 struct ttm_placement vmw_mob_placement = {
 174         .num_placement = 1,
 175         .num_busy_placement = 1,
 176         .placement = &mob_placement_flags,
 177         .busy_placement = &mob_placement_flags
 178 };
 179
 180 struct ttm_placement vmw_nonfixed_placement = {
 181         .num_placement = 3,
 182         .placement = nonfixed_placement_flags,
 183         .num_busy_placement = 1,
 184         .busy_placement = &sys_placement_flags
 185 };
 186
 187 struct vmw_ttm_tt {
 188         struct ttm_tt dma_ttm;
 189         struct vmw_private *dev_priv;
 190         int gmr_id;
 191         struct vmw_mob *mob;
 192         int mem_type;
 193         struct sg_table sgt;
 194         struct vmw_sg_table vsgt;
 195         uint64_t sg_alloc_size;
 196         bool mapped;
 197         bool bound;
 198 };
 199
 200 const size_t vmw_tt_size = sizeof(struct vmw_ttm_tt);
 201
 202 /**
 203  * __vmw_piter_non_sg_next: Helper functions to advance
 204  * a struct vmw_piter iterator.
 205  *
 206  * @viter: Pointer to the iterator.
 207  *
 208  * These functions return false if past the end of the list,
 209  * true otherwise. Functions are selected depending on the current
 210  * DMA mapping mode.
 211  */
 212 static bool __vmw_piter_non_sg_next(struct vmw_piter *viter)
 213 {
 214         return ++(viter->i) < viter->num_pages;
 215 }
 216
 217 static bool __vmw_piter_sg_next(struct vmw_piter *viter)
 218 {
 219         bool ret = __vmw_piter_non_sg_next(viter);
 220
 221         return __sg_page_iter_dma_next(&viter->iter) && ret;
 222 }
 223
 224
 225 static dma_addr_t __vmw_piter_dma_addr(struct vmw_piter *viter)
 226 {
 227         return viter->addrs[viter->i];
 228 }
 229
 230 static dma_addr_t __vmw_piter_sg_addr(struct vmw_piter *viter)
 231 {
 232         return sg_page_iter_dma_address(&viter->iter);
 233 }
 234
 235
 236 /**
 237  * vmw_piter_start - Initialize a struct vmw_piter.
 238  *
 239  * @viter: Pointer to the iterator to initialize
 240  * @vsgt: Pointer to a struct vmw_sg_table to initialize from
 241  * @p_offset: Pointer offset used to update current array position
 242  *
 243  * Note that we're following the convention of __sg_page_iter_start, so that
 244  * the iterator doesn't point to a valid page after initialization; it has
 245  * to be advanced one step first.
 246  */
 247 void vmw_piter_start(struct vmw_piter *viter, const struct vmw_sg_table *vsgt,
 248                      unsigned long p_offset)
 249 {
 250         viter->i = p_offset - 1;
 251         viter->num_pages = vsgt->num_pages;
 252         viter->pages = vsgt->pages;
 253         switch (vsgt->mode) {
 254         case vmw_dma_alloc_coherent:
 255                 viter->next = &__vmw_piter_non_sg_next;
 256                 viter->dma_address = &__vmw_piter_dma_addr;
 257                 viter->addrs = vsgt->addrs;
 258                 break;
 259         case vmw_dma_map_populate:
 260         case vmw_dma_map_bind:
 261                 viter->next = &__vmw_piter_sg_next;
 262                 viter->dma_address = &__vmw_piter_sg_addr;
 263                 __sg_page_iter_start(&viter->iter.base, vsgt->sgt->sgl,
 264                                      vsgt->sgt->orig_nents, p_offset);
 265                 break;
 266         default:
 267                 BUG();
 268         }
 269 }
 270
 271 /**
 272  * vmw_ttm_unmap_from_dma - unmap  device addresses previsouly mapped for
 273  * TTM pages
 274  *
 275  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 276  *
 277  * Used to free dma mappings previously mapped by vmw_ttm_map_for_dma.
 278  */
 279 static void vmw_ttm_unmap_from_dma(struct vmw_ttm_tt *vmw_tt)
 280 {
 281         struct device *dev = vmw_tt->dev_priv->drm.dev;
 282
 283         dma_unmap_sgtable(dev, &vmw_tt->sgt, DMA_BIDIRECTIONAL, 0);
 284         vmw_tt->sgt.nents = vmw_tt->sgt.orig_nents;
 285 }
 286
 287 /**
 288  * vmw_ttm_map_for_dma - map TTM pages to get device addresses
 289  *
 290  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 291  *
 292  * This function is used to get device addresses from the kernel DMA layer.
 293  * However, it's violating the DMA API in that when this operation has been
 294  * performed, it's illegal for the CPU to write to the pages without first
 295  * unmapping the DMA mappings, or calling dma_sync_sg_for_cpu(). It is
 296  * therefore only legal to call this function if we know that the function
 297  * dma_sync_sg_for_cpu() is a NOP, and dma_sync_sg_for_device() is at most
 298  * a CPU write buffer flush.
 299  */
 300 static int vmw_ttm_map_for_dma(struct vmw_ttm_tt *vmw_tt)
 301 {
 302         struct device *dev = vmw_tt->dev_priv->drm.dev;
 303
 304         return dma_map_sgtable(dev, &vmw_tt->sgt, DMA_BIDIRECTIONAL, 0);
 305 }
 306
 307 /**
 308  * vmw_ttm_map_dma - Make sure TTM pages are visible to the device
 309  *
 310  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 311  *
 312  * Select the correct function for and make sure the TTM pages are
 313  * visible to the device. Allocate storage for the device mappings.
 314  * If a mapping has already been performed, indicated by the storage
 315  * pointer being non NULL, the function returns success.
 316  */
 317 static int vmw_ttm_map_dma(struct vmw_ttm_tt *vmw_tt)
 318 {
 319         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 320         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 321         struct vmw_sg_table *vsgt = &vmw_tt->vsgt;
 322         struct ttm_operation_ctx ctx = {
 323                 .interruptible = true,
 324                 .no_wait_gpu = false
 325         };
 326         struct vmw_piter iter;
 327         dma_addr_t old;
 328         int ret = 0;
 329         static size_t sgl_size;
 330         static size_t sgt_size;
 331         struct scatterlist *sg;
 332
 333         if (vmw_tt->mapped)
 334                 return 0;
 335
 336         vsgt->mode = dev_priv->map_mode;
 337         vsgt->pages = vmw_tt->dma_ttm.pages;
 338         vsgt->num_pages = vmw_tt->dma_ttm.num_pages;
 339         vsgt->addrs = vmw_tt->dma_ttm.dma_address;
 340         vsgt->sgt = &vmw_tt->sgt;
 341
 342         switch (dev_priv->map_mode) {
 343         case vmw_dma_map_bind:
 344         case vmw_dma_map_populate:
 345                 if (unlikely(!sgl_size)) {
 346                         sgl_size = ttm_round_pot(sizeof(struct scatterlist));
 347                         sgt_size = ttm_round_pot(sizeof(struct sg_table));
 348                 }
 349                 vmw_tt->sg_alloc_size = sgt_size + sgl_size * vsgt->num_pages;
 350                 ret = ttm_mem_global_alloc(glob, vmw_tt->sg_alloc_size, &ctx);
 351                 if (unlikely(ret != 0))
 352                         return ret;
 353
 354                 sg = __sg_alloc_table_from_pages(&vmw_tt->sgt, vsgt->pages,
 355                                 vsgt->num_pages, 0,
 356                                 (unsigned long) vsgt->num_pages << PAGE_SHIFT,
 357                                 dma_get_max_seg_size(dev_priv->drm.dev),
 358                                 NULL, 0, GFP_KERNEL);
 359                 if (IS_ERR(sg)) {
 360                         ret = PTR_ERR(sg);
 361                         goto out_sg_alloc_fail;
 362                 }
 363
 364                 if (vsgt->num_pages > vmw_tt->sgt.orig_nents) {
 365                         uint64_t over_alloc =
 366                                 sgl_size * (vsgt->num_pages -
 367                                             vmw_tt->sgt.orig_nents);
 368
 369                         ttm_mem_global_free(glob, over_alloc);
 370                         vmw_tt->sg_alloc_size -= over_alloc;
 371                 }
 372
 373                 ret = vmw_ttm_map_for_dma(vmw_tt);
 374                 if (unlikely(ret != 0))
 375                         goto out_map_fail;
 376
 377                 break;
 378         default:
 379                 break;
 380         }
 381
 382         old = ~((dma_addr_t) 0);
 383         vmw_tt->vsgt.num_regions = 0;
 384         for (vmw_piter_start(&iter, vsgt, 0); vmw_piter_next(&iter);) {
 385                 dma_addr_t cur = vmw_piter_dma_addr(&iter);
 386
 387                 if (cur != old + PAGE_SIZE)
 388                         vmw_tt->vsgt.num_regions++;
 389                 old = cur;
 390         }
 391
 392         vmw_tt->mapped = true;
 393         return 0;
 394
 395 out_map_fail:
 396         sg_free_table(vmw_tt->vsgt.sgt);
 397         vmw_tt->vsgt.sgt = NULL;
 398 out_sg_alloc_fail:
 399         ttm_mem_global_free(glob, vmw_tt->sg_alloc_size);
 400         return ret;
 401 }
 402
 403 /**
 404  * vmw_ttm_unmap_dma - Tear down any TTM page device mappings
 405  *
 406  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 407  *
 408  * Tear down any previously set up device DMA mappings and free
 409  * any storage space allocated for them. If there are no mappings set up,
 410  * this function is a NOP.
 411  */
 412 static void vmw_ttm_unmap_dma(struct vmw_ttm_tt *vmw_tt)
 413 {
 414         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 415
 416         if (!vmw_tt->vsgt.sgt)
 417                 return;
 418
 419         switch (dev_priv->map_mode) {
 420         case vmw_dma_map_bind:
 421         case vmw_dma_map_populate:
 422                 vmw_ttm_unmap_from_dma(vmw_tt);
 423                 sg_free_table(vmw_tt->vsgt.sgt);
 424                 vmw_tt->vsgt.sgt = NULL;
 425                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 426                                     vmw_tt->sg_alloc_size);
 427                 break;
 428         default:
 429                 break;
 430         }
 431         vmw_tt->mapped = false;
 432 }
 433
 434 /**
 435  * vmw_bo_sg_table - Return a struct vmw_sg_table object for a
 436  * TTM buffer object
 437  *
 438  * @bo: Pointer to a struct ttm_buffer_object
 439  *
 440  * Returns a pointer to a struct vmw_sg_table object. The object should
 441  * not be freed after use.
 442  * Note that for the device addresses to be valid, the buffer object must
 443  * either be reserved or pinned.
 444  */
 445 const struct vmw_sg_table *vmw_bo_sg_table(struct ttm_buffer_object *bo)
 446 {
 447         struct vmw_ttm_tt *vmw_tt =
 448                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);
 449
 450         return &vmw_tt->vsgt;
 451 }
 452
 453
 454 static int vmw_ttm_bind(struct ttm_device *bdev,
 455                         struct ttm_tt *ttm, struct ttm_resource *bo_mem)
 456 {
 457         struct vmw_ttm_tt *vmw_be =
 458                 container_of(ttm, struct vmw_ttm_tt, dma_ttm);
 459         int ret = 0;
 460
 461         if (!bo_mem)
 462                 return -EINVAL;
 463
 464         if (vmw_be->bound)
 465                 return 0;
 466
 467         ret = vmw_ttm_map_dma(vmw_be);
 468         if (unlikely(ret != 0))
 469                 return ret;
 470
 471         vmw_be->gmr_id = bo_mem->start;
 472         vmw_be->mem_type = bo_mem->mem_type;
 473
 474         switch (bo_mem->mem_type) {
 475         case VMW_PL_GMR:
 476                 ret = vmw_gmr_bind(vmw_be->dev_priv, &vmw_be->vsgt,
 477                                     ttm->num_pages, vmw_be->gmr_id);
 478                 break;
 479         case VMW_PL_MOB:
 480                 if (unlikely(vmw_be->mob == NULL)) {
 481                         vmw_be->mob =
 482                                 vmw_mob_create(ttm->num_pages);
 483                         if (unlikely(vmw_be->mob == NULL))
 484                                 return -ENOMEM;
 485                 }
 486
 487                 ret = vmw_mob_bind(vmw_be->dev_priv, vmw_be->mob,
 488                                     &vmw_be->vsgt, ttm->num_pages,
 489                                     vmw_be->gmr_id);
 490                 break;
 491         default:
 492                 BUG();
 493         }
 494         vmw_be->bound = true;
 495         return ret;
 496 }
 497
 498 static void vmw_ttm_unbind(struct ttm_device *bdev,
 499                            struct ttm_tt *ttm)
 500 {
 501         struct vmw_ttm_tt *vmw_be =
 502                 container_of(ttm, struct vmw_ttm_tt, dma_ttm);
 503
 504         if (!vmw_be->bound)
 505                 return;
 506
 507         switch (vmw_be->mem_type) {
 508         case VMW_PL_GMR:
 509                 vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
 510                 break;
 511         case VMW_PL_MOB:
 512                 vmw_mob_unbind(vmw_be->dev_priv, vmw_be->mob);
 513                 break;
 514         default:
 515                 BUG();
 516         }
 517
 518         if (vmw_be->dev_priv->map_mode == vmw_dma_map_bind)
 519                 vmw_ttm_unmap_dma(vmw_be);
 520         vmw_be->bound = false;
 521 }
 522
 523
 524 static void vmw_ttm_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
 525 {
 526         struct vmw_ttm_tt *vmw_be =
 527                 container_of(ttm, struct vmw_ttm_tt, dma_ttm);
 528
 529         vmw_ttm_unbind(bdev, ttm);
 530         ttm_tt_destroy_common(bdev, ttm);
 531         vmw_ttm_unmap_dma(vmw_be);
 532         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 533                 ttm_tt_fini(&vmw_be->dma_ttm);
 534         else
 535                 ttm_tt_fini(ttm);
 536
 537         if (vmw_be->mob)
 538                 vmw_mob_destroy(vmw_be->mob);
 539
 540         kfree(vmw_be);
 541 }
 542
 543
 544 static int vmw_ttm_populate(struct ttm_device *bdev,
 545                             struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
 546 {
 547         unsigned int i;
 548         int ret;
 549
 550         /* TODO: maybe completely drop this ? */
 551         if (ttm_tt_is_populated(ttm))
 552                 return 0;
 553
 554         ret = ttm_pool_alloc(&bdev->pool, ttm, ctx);
 555         if (ret)
 556                 return ret;
 557
 558         for (i = 0; i < ttm->num_pages; ++i) {
 559                 ret = ttm_mem_global_alloc_page(&ttm_mem_glob, ttm->pages[i],
 560                                                 PAGE_SIZE, ctx);
 561                 if (ret)
 562                         goto error;
 563         }
 564         return 0;
 565
 566 error:
 567         while (i--)
 568                 ttm_mem_global_free_page(&ttm_mem_glob, ttm->pages[i],
 569                                          PAGE_SIZE);
 570         ttm_pool_free(&bdev->pool, ttm);
 571         return ret;
 572 }
 573
 574 static void vmw_ttm_unpopulate(struct ttm_device *bdev,
 575                                struct ttm_tt *ttm)
 576 {
 577         struct vmw_ttm_tt *vmw_tt = container_of(ttm, struct vmw_ttm_tt,
 578                                                  dma_ttm);
 579         unsigned int i;
 580
 581         if (vmw_tt->mob) {
 582                 vmw_mob_destroy(vmw_tt->mob);
 583                 vmw_tt->mob = NULL;
 584         }
 585
 586         vmw_ttm_unmap_dma(vmw_tt);
 587
 588         for (i = 0; i < ttm->num_pages; ++i)
 589                 ttm_mem_global_free_page(&ttm_mem_glob, ttm->pages[i],
 590                                          PAGE_SIZE);
 591
 592         ttm_pool_free(&bdev->pool, ttm);
 593 }
 594
 595 static struct ttm_tt *vmw_ttm_tt_create(struct ttm_buffer_object *bo,
 596                                         uint32_t page_flags)
 597 {
 598         struct vmw_ttm_tt *vmw_be;
 599         int ret;
 600
 601         vmw_be = kzalloc(sizeof(*vmw_be), GFP_KERNEL);
 602         if (!vmw_be)
 603                 return NULL;
 604
 605         vmw_be->dev_priv = container_of(bo->bdev, struct vmw_private, bdev);
 606         vmw_be->mob = NULL;
 607
 608         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 609                 ret = ttm_sg_tt_init(&vmw_be->dma_ttm, bo, page_flags,
 610                                      ttm_cached);
 611         else
 612                 ret = ttm_tt_init(&vmw_be->dma_ttm, bo, page_flags,
 613                                   ttm_cached);
 614         if (unlikely(ret != 0))
 615                 goto out_no_init;
 616
 617         return &vmw_be->dma_ttm;
 618 out_no_init:
 619         kfree(vmw_be);
 620         return NULL;
 621 }
 622
 623 static void vmw_evict_flags(struct ttm_buffer_object *bo,
 624                      struct ttm_placement *placement)
 625 {
 626         *placement = vmw_sys_placement;
 627 }
 628
 629 static int vmw_ttm_io_mem_reserve(struct ttm_device *bdev, struct ttm_resource *mem)
 630 {
 631         struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
 632
 633         switch (mem->mem_type) {
 634         case TTM_PL_SYSTEM:
 635         case VMW_PL_GMR:
 636         case VMW_PL_MOB:
 637                 return 0;
 638         case TTM_PL_VRAM:
 639                 mem->bus.offset = (mem->start << PAGE_SHIFT) +
 640                         dev_priv->vram_start;
 641                 mem->bus.is_iomem = true;
 642                 mem->bus.caching = ttm_cached;
 643                 break;
 644         default:
 645                 return -EINVAL;
 646         }
 647         return 0;
 648 }
 649
 650 /**
 651  * vmw_move_notify - TTM move_notify_callback
 652  *
 653  * @bo: The TTM buffer object about to move.
 654  * @old_mem: The old memory where we move from
 655  * @new_mem: The struct ttm_resource indicating to what memory
 656  *       region the move is taking place.
 657  *
 658  * Calls move_notify for all subsystems needing it.
 659  * (currently only resources).
 660  */
 661 static void vmw_move_notify(struct ttm_buffer_object *bo,
 662                             struct ttm_resource *old_mem,
 663                             struct ttm_resource *new_mem)
 664 {
 665         vmw_bo_move_notify(bo, new_mem);
 666         vmw_query_move_notify(bo, old_mem, new_mem);
 667 }
 668
 669
 670 /**
 671  * vmw_swap_notify - TTM move_notify_callback
 672  *
 673  * @bo: The TTM buffer object about to be swapped out.
 674  */
 675 static void vmw_swap_notify(struct ttm_buffer_object *bo)
 676 {
 677         vmw_bo_swap_notify(bo);
 678         (void) ttm_bo_wait(bo, false, false);
 679 }
 680
 681 static int vmw_move(struct ttm_buffer_object *bo,
 682                     bool evict,
 683                     struct ttm_operation_ctx *ctx,
 684                     struct ttm_resource *new_mem,
 685                     struct ttm_place *hop)
 686 {
 687         struct ttm_resource_manager *old_man = ttm_manager_type(bo->bdev, bo->resource->mem_type);
 688         struct ttm_resource_manager *new_man = ttm_manager_type(bo->bdev, new_mem->mem_type);
 689         int ret;
 690
 691         if (new_man->use_tt && new_mem->mem_type != TTM_PL_SYSTEM) {
 692                 ret = vmw_ttm_bind(bo->bdev, bo->ttm, new_mem);
 693                 if (ret)
 694                         return ret;
 695         }
 696
 697         vmw_move_notify(bo, bo->resource, new_mem);
 698
 699         if (old_man->use_tt && new_man->use_tt) {
 700                 if (bo->resource->mem_type == TTM_PL_SYSTEM) {
 701                         ttm_bo_move_null(bo, new_mem);
 702                         return 0;
 703                 }
 704                 ret = ttm_bo_wait_ctx(bo, ctx);
 705                 if (ret)
 706                         goto fail;
 707
 708                 vmw_ttm_unbind(bo->bdev, bo->ttm);
 709                 ttm_resource_free(bo, &bo->resource);
 710                 ttm_bo_assign_mem(bo, new_mem);
 711                 return 0;
 712         } else {
 713                 ret = ttm_bo_move_memcpy(bo, ctx, new_mem);
 714                 if (ret)
 715                         goto fail;
 716         }
 717         return 0;
 718 fail:
 719         vmw_move_notify(bo, new_mem, bo->resource);
 720         return ret;
 721 }
 722
 723 struct ttm_device_funcs vmw_bo_driver = {
 724         .ttm_tt_create = &vmw_ttm_tt_create,
 725         .ttm_tt_populate = &vmw_ttm_populate,
 726         .ttm_tt_unpopulate = &vmw_ttm_unpopulate,
 727         .ttm_tt_destroy = &vmw_ttm_destroy,
 728         .eviction_valuable = ttm_bo_eviction_valuable,
 729         .evict_flags = vmw_evict_flags,
 730         .move = vmw_move,
 731         .swap_notify = vmw_swap_notify,
 732         .io_mem_reserve = &vmw_ttm_io_mem_reserve,
 733 };
 734
 735 int vmw_bo_create_and_populate(struct vmw_private *dev_priv,
 736                                unsigned long bo_size,
 737                                struct ttm_buffer_object **bo_p)
 738 {
 739         struct ttm_operation_ctx ctx = {
 740                 .interruptible = false,
 741                 .no_wait_gpu = false
 742         };
 743         struct ttm_buffer_object *bo;
 744         int ret;
 745
 746         ret = vmw_bo_create_kernel(dev_priv, bo_size,
 747                                    &vmw_sys_placement,
 748                                    &bo);
 749         if (unlikely(ret != 0))
 750                 return ret;
 751
 752         ret = ttm_bo_reserve(bo, false, true, NULL);
 753         BUG_ON(ret != 0);
 754         ret = vmw_ttm_populate(bo->bdev, bo->ttm, &ctx);
 755         if (likely(ret == 0)) {
 756                 struct vmw_ttm_tt *vmw_tt =
 757                         container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);
 758                 ret = vmw_ttm_map_dma(vmw_tt);
 759         }
 760
 761         ttm_bo_unreserve(bo);
 762
 763         if (likely(ret == 0))
 764                 *bo_p = bo;
 765         return ret;
 766 }