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 /**
 226  * __vmw_piter_non_sg_page: Helper functions to return a pointer
 227  * to the current page.
 228  *
 229  * @viter: Pointer to the iterator
 230  *
 231  * These functions return a pointer to the page currently
 232  * pointed to by @viter. Functions are selected depending on the
 233  * current mapping mode.
 234  */
 235 static struct page *__vmw_piter_non_sg_page(struct vmw_piter *viter)
 236 {
 237         return viter->pages[viter->i];
 238 }
 239
 240 /**
 241  * __vmw_piter_phys_addr: Helper functions to return the DMA
 242  * address of the current page.
 243  *
 244  * @viter: Pointer to the iterator
 245  *
 246  * These functions return the DMA address of the page currently
 247  * pointed to by @viter. Functions are selected depending on the
 248  * current mapping mode.
 249  */
 250 static dma_addr_t __vmw_piter_phys_addr(struct vmw_piter *viter)
 251 {
 252         return page_to_phys(viter->pages[viter->i]);
 253 }
 254
 255 static dma_addr_t __vmw_piter_dma_addr(struct vmw_piter *viter)
 256 {
 257         return viter->addrs[viter->i];
 258 }
 259
 260 static dma_addr_t __vmw_piter_sg_addr(struct vmw_piter *viter)
 261 {
 262         return sg_page_iter_dma_address(&viter->iter);
 263 }
 264
 265
 266 /**
 267  * vmw_piter_start - Initialize a struct vmw_piter.
 268  *
 269  * @viter: Pointer to the iterator to initialize
 270  * @vsgt: Pointer to a struct vmw_sg_table to initialize from
 271  * @p_offset: Pointer offset used to update current array position
 272  *
 273  * Note that we're following the convention of __sg_page_iter_start, so that
 274  * the iterator doesn't point to a valid page after initialization; it has
 275  * to be advanced one step first.
 276  */
 277 void vmw_piter_start(struct vmw_piter *viter, const struct vmw_sg_table *vsgt,
 278                      unsigned long p_offset)
 279 {
 280         viter->i = p_offset - 1;
 281         viter->num_pages = vsgt->num_pages;
 282         viter->page = &__vmw_piter_non_sg_page;
 283         viter->pages = vsgt->pages;
 284         switch (vsgt->mode) {
 285         case vmw_dma_phys:
 286                 viter->next = &__vmw_piter_non_sg_next;
 287                 viter->dma_address = &__vmw_piter_phys_addr;
 288                 break;
 289         case vmw_dma_alloc_coherent:
 290                 viter->next = &__vmw_piter_non_sg_next;
 291                 viter->dma_address = &__vmw_piter_dma_addr;
 292                 viter->addrs = vsgt->addrs;
 293                 break;
 294         case vmw_dma_map_populate:
 295         case vmw_dma_map_bind:
 296                 viter->next = &__vmw_piter_sg_next;
 297                 viter->dma_address = &__vmw_piter_sg_addr;
 298                 __sg_page_iter_start(&viter->iter.base, vsgt->sgt->sgl,
 299                                      vsgt->sgt->orig_nents, p_offset);
 300                 break;
 301         default:
 302                 BUG();
 303         }
 304 }
 305
 306 /**
 307  * vmw_ttm_unmap_from_dma - unmap  device addresses previsouly mapped for
 308  * TTM pages
 309  *
 310  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 311  *
 312  * Used to free dma mappings previously mapped by vmw_ttm_map_for_dma.
 313  */
 314 static void vmw_ttm_unmap_from_dma(struct vmw_ttm_tt *vmw_tt)
 315 {
 316         struct device *dev = vmw_tt->dev_priv->drm.dev;
 317
 318         dma_unmap_sgtable(dev, &vmw_tt->sgt, DMA_BIDIRECTIONAL, 0);
 319         vmw_tt->sgt.nents = vmw_tt->sgt.orig_nents;
 320 }
 321
 322 /**
 323  * vmw_ttm_map_for_dma - map TTM pages to get device addresses
 324  *
 325  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 326  *
 327  * This function is used to get device addresses from the kernel DMA layer.
 328  * However, it's violating the DMA API in that when this operation has been
 329  * performed, it's illegal for the CPU to write to the pages without first
 330  * unmapping the DMA mappings, or calling dma_sync_sg_for_cpu(). It is
 331  * therefore only legal to call this function if we know that the function
 332  * dma_sync_sg_for_cpu() is a NOP, and dma_sync_sg_for_device() is at most
 333  * a CPU write buffer flush.
 334  */
 335 static int vmw_ttm_map_for_dma(struct vmw_ttm_tt *vmw_tt)
 336 {
 337         struct device *dev = vmw_tt->dev_priv->drm.dev;
 338
 339         return dma_map_sgtable(dev, &vmw_tt->sgt, DMA_BIDIRECTIONAL, 0);
 340 }
 341
 342 /**
 343  * vmw_ttm_map_dma - Make sure TTM pages are visible to the device
 344  *
 345  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 346  *
 347  * Select the correct function for and make sure the TTM pages are
 348  * visible to the device. Allocate storage for the device mappings.
 349  * If a mapping has already been performed, indicated by the storage
 350  * pointer being non NULL, the function returns success.
 351  */
 352 static int vmw_ttm_map_dma(struct vmw_ttm_tt *vmw_tt)
 353 {
 354         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 355         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 356         struct vmw_sg_table *vsgt = &vmw_tt->vsgt;
 357         struct ttm_operation_ctx ctx = {
 358                 .interruptible = true,
 359                 .no_wait_gpu = false
 360         };
 361         struct vmw_piter iter;
 362         dma_addr_t old;
 363         int ret = 0;
 364         static size_t sgl_size;
 365         static size_t sgt_size;
 366         struct scatterlist *sg;
 367
 368         if (vmw_tt->mapped)
 369                 return 0;
 370
 371         vsgt->mode = dev_priv->map_mode;
 372         vsgt->pages = vmw_tt->dma_ttm.pages;
 373         vsgt->num_pages = vmw_tt->dma_ttm.num_pages;
 374         vsgt->addrs = vmw_tt->dma_ttm.dma_address;
 375         vsgt->sgt = &vmw_tt->sgt;
 376
 377         switch (dev_priv->map_mode) {
 378         case vmw_dma_map_bind:
 379         case vmw_dma_map_populate:
 380                 if (unlikely(!sgl_size)) {
 381                         sgl_size = ttm_round_pot(sizeof(struct scatterlist));
 382                         sgt_size = ttm_round_pot(sizeof(struct sg_table));
 383                 }
 384                 vmw_tt->sg_alloc_size = sgt_size + sgl_size * vsgt->num_pages;
 385                 ret = ttm_mem_global_alloc(glob, vmw_tt->sg_alloc_size, &ctx);
 386                 if (unlikely(ret != 0))
 387                         return ret;
 388
 389                 sg = __sg_alloc_table_from_pages(&vmw_tt->sgt, vsgt->pages,
 390                                 vsgt->num_pages, 0,
 391                                 (unsigned long) vsgt->num_pages << PAGE_SHIFT,
 392                                 dma_get_max_seg_size(dev_priv->drm.dev),
 393                                 NULL, 0, GFP_KERNEL);
 394                 if (IS_ERR(sg)) {
 395                         ret = PTR_ERR(sg);
 396                         goto out_sg_alloc_fail;
 397                 }
 398
 399                 if (vsgt->num_pages > vmw_tt->sgt.orig_nents) {
 400                         uint64_t over_alloc =
 401                                 sgl_size * (vsgt->num_pages -
 402                                             vmw_tt->sgt.orig_nents);
 403
 404                         ttm_mem_global_free(glob, over_alloc);
 405                         vmw_tt->sg_alloc_size -= over_alloc;
 406                 }
 407
 408                 ret = vmw_ttm_map_for_dma(vmw_tt);
 409                 if (unlikely(ret != 0))
 410                         goto out_map_fail;
 411
 412                 break;
 413         default:
 414                 break;
 415         }
 416
 417         old = ~((dma_addr_t) 0);
 418         vmw_tt->vsgt.num_regions = 0;
 419         for (vmw_piter_start(&iter, vsgt, 0); vmw_piter_next(&iter);) {
 420                 dma_addr_t cur = vmw_piter_dma_addr(&iter);
 421
 422                 if (cur != old + PAGE_SIZE)
 423                         vmw_tt->vsgt.num_regions++;
 424                 old = cur;
 425         }
 426
 427         vmw_tt->mapped = true;
 428         return 0;
 429
 430 out_map_fail:
 431         sg_free_table(vmw_tt->vsgt.sgt);
 432         vmw_tt->vsgt.sgt = NULL;
 433 out_sg_alloc_fail:
 434         ttm_mem_global_free(glob, vmw_tt->sg_alloc_size);
 435         return ret;
 436 }
 437
 438 /**
 439  * vmw_ttm_unmap_dma - Tear down any TTM page device mappings
 440  *
 441  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 442  *
 443  * Tear down any previously set up device DMA mappings and free
 444  * any storage space allocated for them. If there are no mappings set up,
 445  * this function is a NOP.
 446  */
 447 static void vmw_ttm_unmap_dma(struct vmw_ttm_tt *vmw_tt)
 448 {
 449         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 450
 451         if (!vmw_tt->vsgt.sgt)
 452                 return;
 453
 454         switch (dev_priv->map_mode) {
 455         case vmw_dma_map_bind:
 456         case vmw_dma_map_populate:
 457                 vmw_ttm_unmap_from_dma(vmw_tt);
 458                 sg_free_table(vmw_tt->vsgt.sgt);
 459                 vmw_tt->vsgt.sgt = NULL;
 460                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 461                                     vmw_tt->sg_alloc_size);
 462                 break;
 463         default:
 464                 break;
 465         }
 466         vmw_tt->mapped = false;
 467 }
 468
 469 /**
 470  * vmw_bo_sg_table - Return a struct vmw_sg_table object for a
 471  * TTM buffer object
 472  *
 473  * @bo: Pointer to a struct ttm_buffer_object
 474  *
 475  * Returns a pointer to a struct vmw_sg_table object. The object should
 476  * not be freed after use.
 477  * Note that for the device addresses to be valid, the buffer object must
 478  * either be reserved or pinned.
 479  */
 480 const struct vmw_sg_table *vmw_bo_sg_table(struct ttm_buffer_object *bo)
 481 {
 482         struct vmw_ttm_tt *vmw_tt =
 483                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);
 484
 485         return &vmw_tt->vsgt;
 486 }
 487
 488
 489 static int vmw_ttm_bind(struct ttm_device *bdev,
 490                         struct ttm_tt *ttm, struct ttm_resource *bo_mem)
 491 {
 492         struct vmw_ttm_tt *vmw_be =
 493                 container_of(ttm, struct vmw_ttm_tt, dma_ttm);
 494         int ret = 0;
 495
 496         if (!bo_mem)
 497                 return -EINVAL;
 498
 499         if (vmw_be->bound)
 500                 return 0;
 501
 502         ret = vmw_ttm_map_dma(vmw_be);
 503         if (unlikely(ret != 0))
 504                 return ret;
 505
 506         vmw_be->gmr_id = bo_mem->start;
 507         vmw_be->mem_type = bo_mem->mem_type;
 508
 509         switch (bo_mem->mem_type) {
 510         case VMW_PL_GMR:
 511                 ret = vmw_gmr_bind(vmw_be->dev_priv, &vmw_be->vsgt,
 512                                     ttm->num_pages, vmw_be->gmr_id);
 513                 break;
 514         case VMW_PL_MOB:
 515                 if (unlikely(vmw_be->mob == NULL)) {
 516                         vmw_be->mob =
 517                                 vmw_mob_create(ttm->num_pages);
 518                         if (unlikely(vmw_be->mob == NULL))
 519                                 return -ENOMEM;
 520                 }
 521
 522                 ret = vmw_mob_bind(vmw_be->dev_priv, vmw_be->mob,
 523                                     &vmw_be->vsgt, ttm->num_pages,
 524                                     vmw_be->gmr_id);
 525                 break;
 526         default:
 527                 BUG();
 528         }
 529         vmw_be->bound = true;
 530         return ret;
 531 }
 532
 533 static void vmw_ttm_unbind(struct ttm_device *bdev,
 534                            struct ttm_tt *ttm)
 535 {
 536         struct vmw_ttm_tt *vmw_be =
 537                 container_of(ttm, struct vmw_ttm_tt, dma_ttm);
 538
 539         if (!vmw_be->bound)
 540                 return;
 541
 542         switch (vmw_be->mem_type) {
 543         case VMW_PL_GMR:
 544                 vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
 545                 break;
 546         case VMW_PL_MOB:
 547                 vmw_mob_unbind(vmw_be->dev_priv, vmw_be->mob);
 548                 break;
 549         default:
 550                 BUG();
 551         }
 552
 553         if (vmw_be->dev_priv->map_mode == vmw_dma_map_bind)
 554                 vmw_ttm_unmap_dma(vmw_be);
 555         vmw_be->bound = false;
 556 }
 557
 558
 559 static void vmw_ttm_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
 560 {
 561         struct vmw_ttm_tt *vmw_be =
 562                 container_of(ttm, struct vmw_ttm_tt, dma_ttm);
 563
 564         vmw_ttm_unbind(bdev, ttm);
 565         ttm_tt_destroy_common(bdev, ttm);
 566         vmw_ttm_unmap_dma(vmw_be);
 567         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 568                 ttm_tt_fini(&vmw_be->dma_ttm);
 569         else
 570                 ttm_tt_fini(ttm);
 571
 572         if (vmw_be->mob)
 573                 vmw_mob_destroy(vmw_be->mob);
 574
 575         kfree(vmw_be);
 576 }
 577
 578
 579 static int vmw_ttm_populate(struct ttm_device *bdev,
 580                             struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
 581 {
 582         unsigned int i;
 583         int ret;
 584
 585         /* TODO: maybe completely drop this ? */
 586         if (ttm_tt_is_populated(ttm))
 587                 return 0;
 588
 589         ret = ttm_pool_alloc(&bdev->pool, ttm, ctx);
 590         if (ret)
 591                 return ret;
 592
 593         for (i = 0; i < ttm->num_pages; ++i) {
 594                 ret = ttm_mem_global_alloc_page(&ttm_mem_glob, ttm->pages[i],
 595                                                 PAGE_SIZE, ctx);
 596                 if (ret)
 597                         goto error;
 598         }
 599         return 0;
 600
 601 error:
 602         while (i--)
 603                 ttm_mem_global_free_page(&ttm_mem_glob, ttm->pages[i],
 604                                          PAGE_SIZE);
 605         ttm_pool_free(&bdev->pool, ttm);
 606         return ret;
 607 }
 608
 609 static void vmw_ttm_unpopulate(struct ttm_device *bdev,
 610                                struct ttm_tt *ttm)
 611 {
 612         struct vmw_ttm_tt *vmw_tt = container_of(ttm, struct vmw_ttm_tt,
 613                                                  dma_ttm);
 614         unsigned int i;
 615
 616         if (vmw_tt->mob) {
 617                 vmw_mob_destroy(vmw_tt->mob);
 618                 vmw_tt->mob = NULL;
 619         }
 620
 621         vmw_ttm_unmap_dma(vmw_tt);
 622
 623         for (i = 0; i < ttm->num_pages; ++i)
 624                 ttm_mem_global_free_page(&ttm_mem_glob, ttm->pages[i],
 625                                          PAGE_SIZE);
 626
 627         ttm_pool_free(&bdev->pool, ttm);
 628 }
 629
 630 static struct ttm_tt *vmw_ttm_tt_create(struct ttm_buffer_object *bo,
 631                                         uint32_t page_flags)
 632 {
 633         struct vmw_ttm_tt *vmw_be;
 634         int ret;
 635
 636         vmw_be = kzalloc(sizeof(*vmw_be), GFP_KERNEL);
 637         if (!vmw_be)
 638                 return NULL;
 639
 640         vmw_be->dev_priv = container_of(bo->bdev, struct vmw_private, bdev);
 641         vmw_be->mob = NULL;
 642
 643         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 644                 ret = ttm_sg_tt_init(&vmw_be->dma_ttm, bo, page_flags,
 645                                      ttm_cached);
 646         else
 647                 ret = ttm_tt_init(&vmw_be->dma_ttm, bo, page_flags,
 648                                   ttm_cached);
 649         if (unlikely(ret != 0))
 650                 goto out_no_init;
 651
 652         return &vmw_be->dma_ttm;
 653 out_no_init:
 654         kfree(vmw_be);
 655         return NULL;
 656 }
 657
 658 static void vmw_evict_flags(struct ttm_buffer_object *bo,
 659                      struct ttm_placement *placement)
 660 {
 661         *placement = vmw_sys_placement;
 662 }
 663
 664 static int vmw_ttm_io_mem_reserve(struct ttm_device *bdev, struct ttm_resource *mem)
 665 {
 666         struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
 667
 668         switch (mem->mem_type) {
 669         case TTM_PL_SYSTEM:
 670         case VMW_PL_GMR:
 671         case VMW_PL_MOB:
 672                 return 0;
 673         case TTM_PL_VRAM:
 674                 mem->bus.offset = (mem->start << PAGE_SHIFT) +
 675                         dev_priv->vram_start;
 676                 mem->bus.is_iomem = true;
 677                 mem->bus.caching = ttm_cached;
 678                 break;
 679         default:
 680                 return -EINVAL;
 681         }
 682         return 0;
 683 }
 684
 685 /**
 686  * vmw_move_notify - TTM move_notify_callback
 687  *
 688  * @bo: The TTM buffer object about to move.
 689  * @old_mem: The old memory where we move from
 690  * @new_mem: The struct ttm_resource indicating to what memory
 691  *       region the move is taking place.
 692  *
 693  * Calls move_notify for all subsystems needing it.
 694  * (currently only resources).
 695  */
 696 static void vmw_move_notify(struct ttm_buffer_object *bo,
 697                             struct ttm_resource *old_mem,
 698                             struct ttm_resource *new_mem)
 699 {
 700         vmw_bo_move_notify(bo, new_mem);
 701         vmw_query_move_notify(bo, old_mem, new_mem);
 702 }
 703
 704
 705 /**
 706  * vmw_swap_notify - TTM move_notify_callback
 707  *
 708  * @bo: The TTM buffer object about to be swapped out.
 709  */
 710 static void vmw_swap_notify(struct ttm_buffer_object *bo)
 711 {
 712         vmw_bo_swap_notify(bo);
 713         (void) ttm_bo_wait(bo, false, false);
 714 }
 715
 716 static int vmw_move(struct ttm_buffer_object *bo,
 717                     bool evict,
 718                     struct ttm_operation_ctx *ctx,
 719                     struct ttm_resource *new_mem,
 720                     struct ttm_place *hop)
 721 {
 722         struct ttm_resource_manager *old_man = ttm_manager_type(bo->bdev, bo->resource->mem_type);
 723         struct ttm_resource_manager *new_man = ttm_manager_type(bo->bdev, new_mem->mem_type);
 724         int ret;
 725
 726         if (new_man->use_tt && new_mem->mem_type != TTM_PL_SYSTEM) {
 727                 ret = vmw_ttm_bind(bo->bdev, bo->ttm, new_mem);
 728                 if (ret)
 729                         return ret;
 730         }
 731
 732         vmw_move_notify(bo, bo->resource, new_mem);
 733
 734         if (old_man->use_tt && new_man->use_tt) {
 735                 if (bo->resource->mem_type == TTM_PL_SYSTEM) {
 736                         ttm_bo_move_null(bo, new_mem);
 737                         return 0;
 738                 }
 739                 ret = ttm_bo_wait_ctx(bo, ctx);
 740                 if (ret)
 741                         goto fail;
 742
 743                 vmw_ttm_unbind(bo->bdev, bo->ttm);
 744                 ttm_resource_free(bo, &bo->resource);
 745                 ttm_bo_assign_mem(bo, new_mem);
 746                 return 0;
 747         } else {
 748                 ret = ttm_bo_move_memcpy(bo, ctx, new_mem);
 749                 if (ret)
 750                         goto fail;
 751         }
 752         return 0;
 753 fail:
 754         vmw_move_notify(bo, new_mem, bo->resource);
 755         return ret;
 756 }
 757
 758 struct ttm_device_funcs vmw_bo_driver = {
 759         .ttm_tt_create = &vmw_ttm_tt_create,
 760         .ttm_tt_populate = &vmw_ttm_populate,
 761         .ttm_tt_unpopulate = &vmw_ttm_unpopulate,
 762         .ttm_tt_destroy = &vmw_ttm_destroy,
 763         .eviction_valuable = ttm_bo_eviction_valuable,
 764         .evict_flags = vmw_evict_flags,
 765         .move = vmw_move,
 766         .swap_notify = vmw_swap_notify,
 767         .io_mem_reserve = &vmw_ttm_io_mem_reserve,
 768 };
 769
 770 int vmw_bo_create_and_populate(struct vmw_private *dev_priv,
 771                                unsigned long bo_size,
 772                                struct ttm_buffer_object **bo_p)
 773 {
 774         struct ttm_operation_ctx ctx = {
 775                 .interruptible = false,
 776                 .no_wait_gpu = false
 777         };
 778         struct ttm_buffer_object *bo;
 779         int ret;
 780
 781         ret = vmw_bo_create_kernel(dev_priv, bo_size,
 782                                    &vmw_sys_placement,
 783                                    &bo);
 784         if (unlikely(ret != 0))
 785                 return ret;
 786
 787         ret = ttm_bo_reserve(bo, false, true, NULL);
 788         BUG_ON(ret != 0);
 789         ret = vmw_ttm_populate(bo->bdev, bo->ttm, &ctx);
 790         if (likely(ret == 0)) {
 791                 struct vmw_ttm_tt *vmw_tt =
 792                         container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);
 793                 ret = vmw_ttm_map_dma(vmw_tt);
 794         }
 795
 796         ttm_bo_unreserve(bo);
 797
 798         if (likely(ret == 0))
 799                 *bo_p = bo;
 800         return ret;
 801 }