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 #include <drm/ttm/ttm_page_alloc.h>
  32
  33 static const struct ttm_place vram_placement_flags = {
  34         .fpfn = 0,
  35         .lpfn = 0,
  36         .mem_type = TTM_PL_VRAM,
  37         .flags = 0
  38 };
  39
  40 static const struct ttm_place sys_placement_flags = {
  41         .fpfn = 0,
  42         .lpfn = 0,
  43         .mem_type = TTM_PL_SYSTEM,
  44         .flags = 0
  45 };
  46
  47 static const struct ttm_place gmr_placement_flags = {
  48         .fpfn = 0,
  49         .lpfn = 0,
  50         .mem_type = VMW_PL_GMR,
  51         .flags = 0
  52 };
  53
  54 static const struct ttm_place mob_placement_flags = {
  55         .fpfn = 0,
  56         .lpfn = 0,
  57         .mem_type = VMW_PL_MOB,
  58         .flags = 0
  59 };
  60
  61 struct ttm_placement vmw_vram_placement = {
  62         .num_placement = 1,
  63         .placement = &vram_placement_flags,
  64         .num_busy_placement = 1,
  65         .busy_placement = &vram_placement_flags
  66 };
  67
  68 static const struct ttm_place vram_gmr_placement_flags[] = {
  69         {
  70                 .fpfn = 0,
  71                 .lpfn = 0,
  72                 .mem_type = TTM_PL_VRAM,
  73                 .flags = 0
  74         }, {
  75                 .fpfn = 0,
  76                 .lpfn = 0,
  77                 .mem_type = VMW_PL_GMR,
  78                 .flags = 0
  79         }
  80 };
  81
  82 static const struct ttm_place gmr_vram_placement_flags[] = {
  83         {
  84                 .fpfn = 0,
  85                 .lpfn = 0,
  86                 .mem_type = VMW_PL_GMR,
  87                 .flags = 0
  88         }, {
  89                 .fpfn = 0,
  90                 .lpfn = 0,
  91                 .mem_type = TTM_PL_VRAM,
  92                 .flags = 0
  93         }
  94 };
  95
  96 struct ttm_placement vmw_vram_gmr_placement = {
  97         .num_placement = 2,
  98         .placement = vram_gmr_placement_flags,
  99         .num_busy_placement = 1,
 100         .busy_placement = &gmr_placement_flags
 101 };
 102
 103 struct ttm_placement vmw_vram_sys_placement = {
 104         .num_placement = 1,
 105         .placement = &vram_placement_flags,
 106         .num_busy_placement = 1,
 107         .busy_placement = &sys_placement_flags
 108 };
 109
 110 struct ttm_placement vmw_sys_placement = {
 111         .num_placement = 1,
 112         .placement = &sys_placement_flags,
 113         .num_busy_placement = 1,
 114         .busy_placement = &sys_placement_flags
 115 };
 116
 117 static const struct ttm_place evictable_placement_flags[] = {
 118         {
 119                 .fpfn = 0,
 120                 .lpfn = 0,
 121                 .mem_type = TTM_PL_SYSTEM,
 122                 .flags = 0
 123         }, {
 124                 .fpfn = 0,
 125                 .lpfn = 0,
 126                 .mem_type = TTM_PL_VRAM,
 127                 .flags = 0
 128         }, {
 129                 .fpfn = 0,
 130                 .lpfn = 0,
 131                 .mem_type = VMW_PL_GMR,
 132                 .flags = 0
 133         }, {
 134                 .fpfn = 0,
 135                 .lpfn = 0,
 136                 .mem_type = VMW_PL_MOB,
 137                 .flags = 0
 138         }
 139 };
 140
 141 static const struct ttm_place nonfixed_placement_flags[] = {
 142         {
 143                 .fpfn = 0,
 144                 .lpfn = 0,
 145                 .mem_type = TTM_PL_SYSTEM,
 146                 .flags = 0
 147         }, {
 148                 .fpfn = 0,
 149                 .lpfn = 0,
 150                 .mem_type = VMW_PL_GMR,
 151                 .flags = 0
 152         }, {
 153                 .fpfn = 0,
 154                 .lpfn = 0,
 155                 .mem_type = VMW_PL_MOB,
 156                 .flags = 0
 157         }
 158 };
 159
 160 struct ttm_placement vmw_evictable_placement = {
 161         .num_placement = 4,
 162         .placement = evictable_placement_flags,
 163         .num_busy_placement = 1,
 164         .busy_placement = &sys_placement_flags
 165 };
 166
 167 struct ttm_placement vmw_srf_placement = {
 168         .num_placement = 1,
 169         .num_busy_placement = 2,
 170         .placement = &gmr_placement_flags,
 171         .busy_placement = gmr_vram_placement_flags
 172 };
 173
 174 struct ttm_placement vmw_mob_placement = {
 175         .num_placement = 1,
 176         .num_busy_placement = 1,
 177         .placement = &mob_placement_flags,
 178         .busy_placement = &mob_placement_flags
 179 };
 180
 181 struct ttm_placement vmw_nonfixed_placement = {
 182         .num_placement = 3,
 183         .placement = nonfixed_placement_flags,
 184         .num_busy_placement = 1,
 185         .busy_placement = &sys_placement_flags
 186 };
 187
 188 struct vmw_ttm_tt {
 189         struct ttm_dma_tt dma_ttm;
 190         struct vmw_private *dev_priv;
 191         int gmr_id;
 192         struct vmw_mob *mob;
 193         int mem_type;
 194         struct sg_table sgt;
 195         struct vmw_sg_table vsgt;
 196         uint64_t sg_alloc_size;
 197         bool mapped;
 198         bool bound;
 199 };
 200
 201 const size_t vmw_tt_size = sizeof(struct vmw_ttm_tt);
 202
 203 /**
 204  * Helper functions to advance 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  * Helper functions to return a pointer to the current page.
 227  *
 228  * @viter: Pointer to the iterator
 229  *
 230  * These functions return a pointer to the page currently
 231  * pointed to by @viter. Functions are selected depending on the
 232  * current mapping mode.
 233  */
 234 static struct page *__vmw_piter_non_sg_page(struct vmw_piter *viter)
 235 {
 236         return viter->pages[viter->i];
 237 }
 238
 239 /**
 240  * Helper functions to return the DMA address of the current page.
 241  *
 242  * @viter: Pointer to the iterator
 243  *
 244  * These functions return the DMA address of the page currently
 245  * pointed to by @viter. Functions are selected depending on the
 246  * current mapping mode.
 247  */
 248 static dma_addr_t __vmw_piter_phys_addr(struct vmw_piter *viter)
 249 {
 250         return page_to_phys(viter->pages[viter->i]);
 251 }
 252
 253 static dma_addr_t __vmw_piter_dma_addr(struct vmw_piter *viter)
 254 {
 255         return viter->addrs[viter->i];
 256 }
 257
 258 static dma_addr_t __vmw_piter_sg_addr(struct vmw_piter *viter)
 259 {
 260         return sg_page_iter_dma_address(&viter->iter);
 261 }
 262
 263
 264 /**
 265  * vmw_piter_start - Initialize a struct vmw_piter.
 266  *
 267  * @viter: Pointer to the iterator to initialize
 268  * @vsgt: Pointer to a struct vmw_sg_table to initialize from
 269  *
 270  * Note that we're following the convention of __sg_page_iter_start, so that
 271  * the iterator doesn't point to a valid page after initialization; it has
 272  * to be advanced one step first.
 273  */
 274 void vmw_piter_start(struct vmw_piter *viter, const struct vmw_sg_table *vsgt,
 275                      unsigned long p_offset)
 276 {
 277         viter->i = p_offset - 1;
 278         viter->num_pages = vsgt->num_pages;
 279         viter->page = &__vmw_piter_non_sg_page;
 280         viter->pages = vsgt->pages;
 281         switch (vsgt->mode) {
 282         case vmw_dma_phys:
 283                 viter->next = &__vmw_piter_non_sg_next;
 284                 viter->dma_address = &__vmw_piter_phys_addr;
 285                 break;
 286         case vmw_dma_alloc_coherent:
 287                 viter->next = &__vmw_piter_non_sg_next;
 288                 viter->dma_address = &__vmw_piter_dma_addr;
 289                 viter->addrs = vsgt->addrs;
 290                 break;
 291         case vmw_dma_map_populate:
 292         case vmw_dma_map_bind:
 293                 viter->next = &__vmw_piter_sg_next;
 294                 viter->dma_address = &__vmw_piter_sg_addr;
 295                 __sg_page_iter_start(&viter->iter.base, vsgt->sgt->sgl,
 296                                      vsgt->sgt->orig_nents, p_offset);
 297                 break;
 298         default:
 299                 BUG();
 300         }
 301 }
 302
 303 /**
 304  * vmw_ttm_unmap_from_dma - unmap  device addresses previsouly mapped for
 305  * TTM pages
 306  *
 307  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 308  *
 309  * Used to free dma mappings previously mapped by vmw_ttm_map_for_dma.
 310  */
 311 static void vmw_ttm_unmap_from_dma(struct vmw_ttm_tt *vmw_tt)
 312 {
 313         struct device *dev = vmw_tt->dev_priv->dev->dev;
 314
 315         dma_unmap_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.nents,
 316                 DMA_BIDIRECTIONAL);
 317         vmw_tt->sgt.nents = vmw_tt->sgt.orig_nents;
 318 }
 319
 320 /**
 321  * vmw_ttm_map_for_dma - map TTM pages to get device addresses
 322  *
 323  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 324  *
 325  * This function is used to get device addresses from the kernel DMA layer.
 326  * However, it's violating the DMA API in that when this operation has been
 327  * performed, it's illegal for the CPU to write to the pages without first
 328  * unmapping the DMA mappings, or calling dma_sync_sg_for_cpu(). It is
 329  * therefore only legal to call this function if we know that the function
 330  * dma_sync_sg_for_cpu() is a NOP, and dma_sync_sg_for_device() is at most
 331  * a CPU write buffer flush.
 332  */
 333 static int vmw_ttm_map_for_dma(struct vmw_ttm_tt *vmw_tt)
 334 {
 335         struct device *dev = vmw_tt->dev_priv->dev->dev;
 336         int ret;
 337
 338         ret = dma_map_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.orig_nents,
 339                          DMA_BIDIRECTIONAL);
 340         if (unlikely(ret == 0))
 341                 return -ENOMEM;
 342
 343         vmw_tt->sgt.nents = ret;
 344
 345         return 0;
 346 }
 347
 348 /**
 349  * vmw_ttm_map_dma - Make sure TTM pages are visible to the device
 350  *
 351  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 352  *
 353  * Select the correct function for and make sure the TTM pages are
 354  * visible to the device. Allocate storage for the device mappings.
 355  * If a mapping has already been performed, indicated by the storage
 356  * pointer being non NULL, the function returns success.
 357  */
 358 static int vmw_ttm_map_dma(struct vmw_ttm_tt *vmw_tt)
 359 {
 360         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 361         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 362         struct vmw_sg_table *vsgt = &vmw_tt->vsgt;
 363         struct ttm_operation_ctx ctx = {
 364                 .interruptible = true,
 365                 .no_wait_gpu = false
 366         };
 367         struct vmw_piter iter;
 368         dma_addr_t old;
 369         int ret = 0;
 370         static size_t sgl_size;
 371         static size_t sgt_size;
 372
 373         if (vmw_tt->mapped)
 374                 return 0;
 375
 376         vsgt->mode = dev_priv->map_mode;
 377         vsgt->pages = vmw_tt->dma_ttm.ttm.pages;
 378         vsgt->num_pages = vmw_tt->dma_ttm.ttm.num_pages;
 379         vsgt->addrs = vmw_tt->dma_ttm.dma_address;
 380         vsgt->sgt = &vmw_tt->sgt;
 381
 382         switch (dev_priv->map_mode) {
 383         case vmw_dma_map_bind:
 384         case vmw_dma_map_populate:
 385                 if (unlikely(!sgl_size)) {
 386                         sgl_size = ttm_round_pot(sizeof(struct scatterlist));
 387                         sgt_size = ttm_round_pot(sizeof(struct sg_table));
 388                 }
 389                 vmw_tt->sg_alloc_size = sgt_size + sgl_size * vsgt->num_pages;
 390                 ret = ttm_mem_global_alloc(glob, vmw_tt->sg_alloc_size, &ctx);
 391                 if (unlikely(ret != 0))
 392                         return ret;
 393
 394                 ret = __sg_alloc_table_from_pages
 395                         (&vmw_tt->sgt, vsgt->pages, vsgt->num_pages, 0,
 396                          (unsigned long) vsgt->num_pages << PAGE_SHIFT,
 397                          dma_get_max_seg_size(dev_priv->dev->dev),
 398                          GFP_KERNEL);
 399                 if (unlikely(ret != 0))
 400                         goto out_sg_alloc_fail;
 401
 402                 if (vsgt->num_pages > vmw_tt->sgt.nents) {
 403                         uint64_t over_alloc =
 404                                 sgl_size * (vsgt->num_pages -
 405                                             vmw_tt->sgt.nents);
 406
 407                         ttm_mem_global_free(glob, over_alloc);
 408                         vmw_tt->sg_alloc_size -= over_alloc;
 409                 }
 410
 411                 ret = vmw_ttm_map_for_dma(vmw_tt);
 412                 if (unlikely(ret != 0))
 413                         goto out_map_fail;
 414
 415                 break;
 416         default:
 417                 break;
 418         }
 419
 420         old = ~((dma_addr_t) 0);
 421         vmw_tt->vsgt.num_regions = 0;
 422         for (vmw_piter_start(&iter, vsgt, 0); vmw_piter_next(&iter);) {
 423                 dma_addr_t cur = vmw_piter_dma_addr(&iter);
 424
 425                 if (cur != old + PAGE_SIZE)
 426                         vmw_tt->vsgt.num_regions++;
 427                 old = cur;
 428         }
 429
 430         vmw_tt->mapped = true;
 431         return 0;
 432
 433 out_map_fail:
 434         sg_free_table(vmw_tt->vsgt.sgt);
 435         vmw_tt->vsgt.sgt = NULL;
 436 out_sg_alloc_fail:
 437         ttm_mem_global_free(glob, vmw_tt->sg_alloc_size);
 438         return ret;
 439 }
 440
 441 /**
 442  * vmw_ttm_unmap_dma - Tear down any TTM page device mappings
 443  *
 444  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 445  *
 446  * Tear down any previously set up device DMA mappings and free
 447  * any storage space allocated for them. If there are no mappings set up,
 448  * this function is a NOP.
 449  */
 450 static void vmw_ttm_unmap_dma(struct vmw_ttm_tt *vmw_tt)
 451 {
 452         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 453
 454         if (!vmw_tt->vsgt.sgt)
 455                 return;
 456
 457         switch (dev_priv->map_mode) {
 458         case vmw_dma_map_bind:
 459         case vmw_dma_map_populate:
 460                 vmw_ttm_unmap_from_dma(vmw_tt);
 461                 sg_free_table(vmw_tt->vsgt.sgt);
 462                 vmw_tt->vsgt.sgt = NULL;
 463                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 464                                     vmw_tt->sg_alloc_size);
 465                 break;
 466         default:
 467                 break;
 468         }
 469         vmw_tt->mapped = false;
 470 }
 471
 472 /**
 473  * vmw_bo_sg_table - Return a struct vmw_sg_table object for a
 474  * TTM buffer object
 475  *
 476  * @bo: Pointer to a struct ttm_buffer_object
 477  *
 478  * Returns a pointer to a struct vmw_sg_table object. The object should
 479  * not be freed after use.
 480  * Note that for the device addresses to be valid, the buffer object must
 481  * either be reserved or pinned.
 482  */
 483 const struct vmw_sg_table *vmw_bo_sg_table(struct ttm_buffer_object *bo)
 484 {
 485         struct vmw_ttm_tt *vmw_tt =
 486                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 487
 488         return &vmw_tt->vsgt;
 489 }
 490
 491
 492 static int vmw_ttm_bind(struct ttm_bo_device *bdev,
 493                         struct ttm_tt *ttm, struct ttm_resource *bo_mem)
 494 {
 495         struct vmw_ttm_tt *vmw_be =
 496                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 497         int ret = 0;
 498
 499         if (!bo_mem)
 500                 return -EINVAL;
 501
 502         if (vmw_be->bound)
 503                 return 0;
 504
 505         ret = vmw_ttm_map_dma(vmw_be);
 506         if (unlikely(ret != 0))
 507                 return ret;
 508
 509         vmw_be->gmr_id = bo_mem->start;
 510         vmw_be->mem_type = bo_mem->mem_type;
 511
 512         switch (bo_mem->mem_type) {
 513         case VMW_PL_GMR:
 514                 ret = vmw_gmr_bind(vmw_be->dev_priv, &vmw_be->vsgt,
 515                                     ttm->num_pages, vmw_be->gmr_id);
 516                 break;
 517         case VMW_PL_MOB:
 518                 if (unlikely(vmw_be->mob == NULL)) {
 519                         vmw_be->mob =
 520                                 vmw_mob_create(ttm->num_pages);
 521                         if (unlikely(vmw_be->mob == NULL))
 522                                 return -ENOMEM;
 523                 }
 524
 525                 ret = vmw_mob_bind(vmw_be->dev_priv, vmw_be->mob,
 526                                     &vmw_be->vsgt, ttm->num_pages,
 527                                     vmw_be->gmr_id);
 528                 break;
 529         default:
 530                 BUG();
 531         }
 532         vmw_be->bound = true;
 533         return ret;
 534 }
 535
 536 static void vmw_ttm_unbind(struct ttm_bo_device *bdev,
 537                            struct ttm_tt *ttm)
 538 {
 539         struct vmw_ttm_tt *vmw_be =
 540                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 541
 542         if (!vmw_be->bound)
 543                 return;
 544
 545         switch (vmw_be->mem_type) {
 546         case VMW_PL_GMR:
 547                 vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
 548                 break;
 549         case VMW_PL_MOB:
 550                 vmw_mob_unbind(vmw_be->dev_priv, vmw_be->mob);
 551                 break;
 552         default:
 553                 BUG();
 554         }
 555
 556         if (vmw_be->dev_priv->map_mode == vmw_dma_map_bind)
 557                 vmw_ttm_unmap_dma(vmw_be);
 558         vmw_be->bound = false;
 559 }
 560
 561
 562 static void vmw_ttm_destroy(struct ttm_bo_device *bdev, struct ttm_tt *ttm)
 563 {
 564         struct vmw_ttm_tt *vmw_be =
 565                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 566
 567         vmw_ttm_unbind(bdev, ttm);
 568         ttm_tt_destroy_common(bdev, ttm);
 569         vmw_ttm_unmap_dma(vmw_be);
 570         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 571                 ttm_dma_tt_fini(&vmw_be->dma_ttm);
 572         else
 573                 ttm_tt_fini(ttm);
 574
 575         if (vmw_be->mob)
 576                 vmw_mob_destroy(vmw_be->mob);
 577
 578         kfree(vmw_be);
 579 }
 580
 581
 582 static int vmw_ttm_populate(struct ttm_bo_device *bdev,
 583                             struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
 584 {
 585         struct vmw_ttm_tt *vmw_tt =
 586                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 587         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 588         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 589         int ret;
 590
 591         if (ttm_tt_is_populated(ttm))
 592                 return 0;
 593
 594         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 595                 size_t size =
 596                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 597                 ret = ttm_mem_global_alloc(glob, size, ctx);
 598                 if (unlikely(ret != 0))
 599                         return ret;
 600
 601                 ret = ttm_dma_populate(&vmw_tt->dma_ttm, dev_priv->dev->dev,
 602                                         ctx);
 603                 if (unlikely(ret != 0))
 604                         ttm_mem_global_free(glob, size);
 605         } else
 606                 ret = ttm_pool_populate(ttm, ctx);
 607
 608         return ret;
 609 }
 610
 611 static void vmw_ttm_unpopulate(struct ttm_bo_device *bdev,
 612                                struct ttm_tt *ttm)
 613 {
 614         struct vmw_ttm_tt *vmw_tt = container_of(ttm, struct vmw_ttm_tt,
 615                                                  dma_ttm.ttm);
 616         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 617         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 618
 619
 620         if (vmw_tt->mob) {
 621                 vmw_mob_destroy(vmw_tt->mob);
 622                 vmw_tt->mob = NULL;
 623         }
 624
 625         vmw_ttm_unmap_dma(vmw_tt);
 626         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 627                 size_t size =
 628                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 629
 630                 ttm_dma_unpopulate(&vmw_tt->dma_ttm, dev_priv->dev->dev);
 631                 ttm_mem_global_free(glob, size);
 632         } else
 633                 ttm_pool_unpopulate(ttm);
 634 }
 635
 636 static struct ttm_tt *vmw_ttm_tt_create(struct ttm_buffer_object *bo,
 637                                         uint32_t page_flags)
 638 {
 639         struct vmw_ttm_tt *vmw_be;
 640         int ret;
 641
 642         vmw_be = kzalloc(sizeof(*vmw_be), GFP_KERNEL);
 643         if (!vmw_be)
 644                 return NULL;
 645
 646         vmw_be->dev_priv = container_of(bo->bdev, struct vmw_private, bdev);
 647         vmw_be->mob = NULL;
 648
 649         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 650                 ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bo, page_flags,
 651                                       ttm_cached);
 652         else
 653                 ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bo, page_flags,
 654                                   ttm_cached);
 655         if (unlikely(ret != 0))
 656                 goto out_no_init;
 657
 658         return &vmw_be->dma_ttm.ttm;
 659 out_no_init:
 660         kfree(vmw_be);
 661         return NULL;
 662 }
 663
 664 static void vmw_evict_flags(struct ttm_buffer_object *bo,
 665                      struct ttm_placement *placement)
 666 {
 667         *placement = vmw_sys_placement;
 668 }
 669
 670 static int vmw_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 671 {
 672         struct ttm_object_file *tfile =
 673                 vmw_fpriv((struct drm_file *)filp->private_data)->tfile;
 674
 675         return vmw_user_bo_verify_access(bo, tfile);
 676 }
 677
 678 static int vmw_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_resource *mem)
 679 {
 680         struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
 681
 682         switch (mem->mem_type) {
 683         case TTM_PL_SYSTEM:
 684         case VMW_PL_GMR:
 685         case VMW_PL_MOB:
 686                 return 0;
 687         case TTM_PL_VRAM:
 688                 mem->bus.offset = (mem->start << PAGE_SHIFT) +
 689                         dev_priv->vram_start;
 690                 mem->bus.is_iomem = true;
 691                 mem->bus.caching = ttm_cached;
 692                 break;
 693         default:
 694                 return -EINVAL;
 695         }
 696         return 0;
 697 }
 698
 699 /**
 700  * vmw_move_notify - TTM move_notify_callback
 701  *
 702  * @bo: The TTM buffer object about to move.
 703  * @mem: The struct ttm_resource indicating to what memory
 704  *       region the move is taking place.
 705  *
 706  * Calls move_notify for all subsystems needing it.
 707  * (currently only resources).
 708  */
 709 static void vmw_move_notify(struct ttm_buffer_object *bo,
 710                             bool evict,
 711                             struct ttm_resource *mem)
 712 {
 713         if (!mem)
 714                 return;
 715         vmw_bo_move_notify(bo, mem);
 716         vmw_query_move_notify(bo, mem);
 717 }
 718
 719
 720 /**
 721  * vmw_swap_notify - TTM move_notify_callback
 722  *
 723  * @bo: The TTM buffer object about to be swapped out.
 724  */
 725 static void vmw_swap_notify(struct ttm_buffer_object *bo)
 726 {
 727         vmw_bo_swap_notify(bo);
 728         (void) ttm_bo_wait(bo, false, false);
 729 }
 730
 731 static int vmw_move(struct ttm_buffer_object *bo,
 732                     bool evict,
 733                     struct ttm_operation_ctx *ctx,
 734                     struct ttm_resource *new_mem)
 735 {
 736         struct ttm_resource_manager *old_man = ttm_manager_type(bo->bdev, bo->mem.mem_type);
 737         struct ttm_resource_manager *new_man = ttm_manager_type(bo->bdev, new_mem->mem_type);
 738
 739         if (old_man->use_tt && new_man->use_tt) {
 740                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 741                         ttm_bo_assign_mem(bo, new_mem);
 742                         return 0;
 743                 }
 744                 return ttm_bo_move_ttm(bo, ctx, new_mem);
 745         } else {
 746                 return ttm_bo_move_memcpy(bo, ctx, new_mem);
 747         }
 748 }
 749
 750 struct ttm_bo_driver vmw_bo_driver = {
 751         .ttm_tt_create = &vmw_ttm_tt_create,
 752         .ttm_tt_populate = &vmw_ttm_populate,
 753         .ttm_tt_unpopulate = &vmw_ttm_unpopulate,
 754         .ttm_tt_bind = &vmw_ttm_bind,
 755         .ttm_tt_unbind = &vmw_ttm_unbind,
 756         .ttm_tt_destroy = &vmw_ttm_destroy,
 757         .eviction_valuable = ttm_bo_eviction_valuable,
 758         .evict_flags = vmw_evict_flags,
 759         .move = vmw_move,
 760         .verify_access = vmw_verify_access,
 761         .move_notify = vmw_move_notify,
 762         .swap_notify = vmw_swap_notify,
 763         .io_mem_reserve = &vmw_ttm_io_mem_reserve,
 764 };
 765
 766 int vmw_bo_create_and_populate(struct vmw_private *dev_priv,
 767                                unsigned long bo_size,
 768                                struct ttm_buffer_object **bo_p)
 769 {
 770         struct ttm_operation_ctx ctx = {
 771                 .interruptible = false,
 772                 .no_wait_gpu = false
 773         };
 774         struct ttm_buffer_object *bo;
 775         int ret;
 776
 777         ret = vmw_bo_create_kernel(dev_priv, bo_size,
 778                                    &vmw_sys_placement,
 779                                    &bo);
 780         if (unlikely(ret != 0))
 781                 return ret;
 782
 783         ret = ttm_bo_reserve(bo, false, true, NULL);
 784         BUG_ON(ret != 0);
 785         ret = vmw_ttm_populate(bo->bdev, bo->ttm, &ctx);
 786         if (likely(ret == 0)) {
 787                 struct vmw_ttm_tt *vmw_tt =
 788                         container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 789                 ret = vmw_ttm_map_dma(vmw_tt);
 790         }
 791
 792         ttm_bo_unreserve(bo);
 793
 794         if (likely(ret == 0))
 795                 *bo_p = bo;
 796         return ret;
 797 }