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         .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED
  37 };
  38
  39 static const struct ttm_place vram_ne_placement_flags = {
  40         .fpfn = 0,
  41         .lpfn = 0,
  42         .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT
  43 };
  44
  45 static const struct ttm_place sys_placement_flags = {
  46         .fpfn = 0,
  47         .lpfn = 0,
  48         .flags = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED
  49 };
  50
  51 static const struct ttm_place sys_ne_placement_flags = {
  52         .fpfn = 0,
  53         .lpfn = 0,
  54         .flags = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT
  55 };
  56
  57 static const struct ttm_place gmr_placement_flags = {
  58         .fpfn = 0,
  59         .lpfn = 0,
  60         .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
  61 };
  62
  63 static const struct ttm_place gmr_ne_placement_flags = {
  64         .fpfn = 0,
  65         .lpfn = 0,
  66         .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT
  67 };
  68
  69 static const struct ttm_place mob_placement_flags = {
  70         .fpfn = 0,
  71         .lpfn = 0,
  72         .flags = VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED
  73 };
  74
  75 static const struct ttm_place mob_ne_placement_flags = {
  76         .fpfn = 0,
  77         .lpfn = 0,
  78         .flags = VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT
  79 };
  80
  81 struct ttm_placement vmw_vram_placement = {
  82         .num_placement = 1,
  83         .placement = &vram_placement_flags,
  84         .num_busy_placement = 1,
  85         .busy_placement = &vram_placement_flags
  86 };
  87
  88 static const struct ttm_place vram_gmr_placement_flags[] = {
  89         {
  90                 .fpfn = 0,
  91                 .lpfn = 0,
  92                 .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED
  93         }, {
  94                 .fpfn = 0,
  95                 .lpfn = 0,
  96                 .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
  97         }
  98 };
  99
 100 static const struct ttm_place gmr_vram_placement_flags[] = {
 101         {
 102                 .fpfn = 0,
 103                 .lpfn = 0,
 104                 .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
 105         }, {
 106                 .fpfn = 0,
 107                 .lpfn = 0,
 108                 .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED
 109         }
 110 };
 111
 112 struct ttm_placement vmw_vram_gmr_placement = {
 113         .num_placement = 2,
 114         .placement = vram_gmr_placement_flags,
 115         .num_busy_placement = 1,
 116         .busy_placement = &gmr_placement_flags
 117 };
 118
 119 static const struct ttm_place vram_gmr_ne_placement_flags[] = {
 120         {
 121                 .fpfn = 0,
 122                 .lpfn = 0,
 123                 .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED |
 124                          TTM_PL_FLAG_NO_EVICT
 125         }, {
 126                 .fpfn = 0,
 127                 .lpfn = 0,
 128                 .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED |
 129                          TTM_PL_FLAG_NO_EVICT
 130         }
 131 };
 132
 133 struct ttm_placement vmw_vram_gmr_ne_placement = {
 134         .num_placement = 2,
 135         .placement = vram_gmr_ne_placement_flags,
 136         .num_busy_placement = 1,
 137         .busy_placement = &gmr_ne_placement_flags
 138 };
 139
 140 struct ttm_placement vmw_vram_sys_placement = {
 141         .num_placement = 1,
 142         .placement = &vram_placement_flags,
 143         .num_busy_placement = 1,
 144         .busy_placement = &sys_placement_flags
 145 };
 146
 147 struct ttm_placement vmw_vram_ne_placement = {
 148         .num_placement = 1,
 149         .placement = &vram_ne_placement_flags,
 150         .num_busy_placement = 1,
 151         .busy_placement = &vram_ne_placement_flags
 152 };
 153
 154 struct ttm_placement vmw_sys_placement = {
 155         .num_placement = 1,
 156         .placement = &sys_placement_flags,
 157         .num_busy_placement = 1,
 158         .busy_placement = &sys_placement_flags
 159 };
 160
 161 struct ttm_placement vmw_sys_ne_placement = {
 162         .num_placement = 1,
 163         .placement = &sys_ne_placement_flags,
 164         .num_busy_placement = 1,
 165         .busy_placement = &sys_ne_placement_flags
 166 };
 167
 168 static const struct ttm_place evictable_placement_flags[] = {
 169         {
 170                 .fpfn = 0,
 171                 .lpfn = 0,
 172                 .flags = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED
 173         }, {
 174                 .fpfn = 0,
 175                 .lpfn = 0,
 176                 .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED
 177         }, {
 178                 .fpfn = 0,
 179                 .lpfn = 0,
 180                 .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
 181         }, {
 182                 .fpfn = 0,
 183                 .lpfn = 0,
 184                 .flags = VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED
 185         }
 186 };
 187
 188 static const struct ttm_place nonfixed_placement_flags[] = {
 189         {
 190                 .fpfn = 0,
 191                 .lpfn = 0,
 192                 .flags = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED
 193         }, {
 194                 .fpfn = 0,
 195                 .lpfn = 0,
 196                 .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
 197         }, {
 198                 .fpfn = 0,
 199                 .lpfn = 0,
 200                 .flags = VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED
 201         }
 202 };
 203
 204 struct ttm_placement vmw_evictable_placement = {
 205         .num_placement = 4,
 206         .placement = evictable_placement_flags,
 207         .num_busy_placement = 1,
 208         .busy_placement = &sys_placement_flags
 209 };
 210
 211 struct ttm_placement vmw_srf_placement = {
 212         .num_placement = 1,
 213         .num_busy_placement = 2,
 214         .placement = &gmr_placement_flags,
 215         .busy_placement = gmr_vram_placement_flags
 216 };
 217
 218 struct ttm_placement vmw_mob_placement = {
 219         .num_placement = 1,
 220         .num_busy_placement = 1,
 221         .placement = &mob_placement_flags,
 222         .busy_placement = &mob_placement_flags
 223 };
 224
 225 struct ttm_placement vmw_mob_ne_placement = {
 226         .num_placement = 1,
 227         .num_busy_placement = 1,
 228         .placement = &mob_ne_placement_flags,
 229         .busy_placement = &mob_ne_placement_flags
 230 };
 231
 232 struct ttm_placement vmw_nonfixed_placement = {
 233         .num_placement = 3,
 234         .placement = nonfixed_placement_flags,
 235         .num_busy_placement = 1,
 236         .busy_placement = &sys_placement_flags
 237 };
 238
 239 struct vmw_ttm_tt {
 240         struct ttm_dma_tt dma_ttm;
 241         struct vmw_private *dev_priv;
 242         int gmr_id;
 243         struct vmw_mob *mob;
 244         int mem_type;
 245         struct sg_table sgt;
 246         struct vmw_sg_table vsgt;
 247         uint64_t sg_alloc_size;
 248         bool mapped;
 249 };
 250
 251 const size_t vmw_tt_size = sizeof(struct vmw_ttm_tt);
 252
 253 /**
 254  * Helper functions to advance a struct vmw_piter iterator.
 255  *
 256  * @viter: Pointer to the iterator.
 257  *
 258  * These functions return false if past the end of the list,
 259  * true otherwise. Functions are selected depending on the current
 260  * DMA mapping mode.
 261  */
 262 static bool __vmw_piter_non_sg_next(struct vmw_piter *viter)
 263 {
 264         return ++(viter->i) < viter->num_pages;
 265 }
 266
 267 static bool __vmw_piter_sg_next(struct vmw_piter *viter)
 268 {
 269         bool ret = __vmw_piter_non_sg_next(viter);
 270
 271         return __sg_page_iter_dma_next(&viter->iter) && ret;
 272 }
 273
 274
 275 /**
 276  * Helper functions to return a pointer to the current page.
 277  *
 278  * @viter: Pointer to the iterator
 279  *
 280  * These functions return a pointer to the page currently
 281  * pointed to by @viter. Functions are selected depending on the
 282  * current mapping mode.
 283  */
 284 static struct page *__vmw_piter_non_sg_page(struct vmw_piter *viter)
 285 {
 286         return viter->pages[viter->i];
 287 }
 288
 289 /**
 290  * Helper functions to return the DMA address of the current page.
 291  *
 292  * @viter: Pointer to the iterator
 293  *
 294  * These functions return the DMA address of the page currently
 295  * pointed to by @viter. Functions are selected depending on the
 296  * current mapping mode.
 297  */
 298 static dma_addr_t __vmw_piter_phys_addr(struct vmw_piter *viter)
 299 {
 300         return page_to_phys(viter->pages[viter->i]);
 301 }
 302
 303 static dma_addr_t __vmw_piter_dma_addr(struct vmw_piter *viter)
 304 {
 305         return viter->addrs[viter->i];
 306 }
 307
 308 static dma_addr_t __vmw_piter_sg_addr(struct vmw_piter *viter)
 309 {
 310         return sg_page_iter_dma_address(&viter->iter);
 311 }
 312
 313
 314 /**
 315  * vmw_piter_start - Initialize a struct vmw_piter.
 316  *
 317  * @viter: Pointer to the iterator to initialize
 318  * @vsgt: Pointer to a struct vmw_sg_table to initialize from
 319  *
 320  * Note that we're following the convention of __sg_page_iter_start, so that
 321  * the iterator doesn't point to a valid page after initialization; it has
 322  * to be advanced one step first.
 323  */
 324 void vmw_piter_start(struct vmw_piter *viter, const struct vmw_sg_table *vsgt,
 325                      unsigned long p_offset)
 326 {
 327         viter->i = p_offset - 1;
 328         viter->num_pages = vsgt->num_pages;
 329         viter->page = &__vmw_piter_non_sg_page;
 330         viter->pages = vsgt->pages;
 331         switch (vsgt->mode) {
 332         case vmw_dma_phys:
 333                 viter->next = &__vmw_piter_non_sg_next;
 334                 viter->dma_address = &__vmw_piter_phys_addr;
 335                 break;
 336         case vmw_dma_alloc_coherent:
 337                 viter->next = &__vmw_piter_non_sg_next;
 338                 viter->dma_address = &__vmw_piter_dma_addr;
 339                 viter->addrs = vsgt->addrs;
 340                 break;
 341         case vmw_dma_map_populate:
 342         case vmw_dma_map_bind:
 343                 viter->next = &__vmw_piter_sg_next;
 344                 viter->dma_address = &__vmw_piter_sg_addr;
 345                 __sg_page_iter_start(&viter->iter.base, vsgt->sgt->sgl,
 346                                      vsgt->sgt->orig_nents, p_offset);
 347                 break;
 348         default:
 349                 BUG();
 350         }
 351 }
 352
 353 /**
 354  * vmw_ttm_unmap_from_dma - unmap  device addresses previsouly mapped for
 355  * TTM pages
 356  *
 357  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 358  *
 359  * Used to free dma mappings previously mapped by vmw_ttm_map_for_dma.
 360  */
 361 static void vmw_ttm_unmap_from_dma(struct vmw_ttm_tt *vmw_tt)
 362 {
 363         struct device *dev = vmw_tt->dev_priv->dev->dev;
 364
 365         dma_unmap_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.nents,
 366                 DMA_BIDIRECTIONAL);
 367         vmw_tt->sgt.nents = vmw_tt->sgt.orig_nents;
 368 }
 369
 370 /**
 371  * vmw_ttm_map_for_dma - map TTM pages to get device addresses
 372  *
 373  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 374  *
 375  * This function is used to get device addresses from the kernel DMA layer.
 376  * However, it's violating the DMA API in that when this operation has been
 377  * performed, it's illegal for the CPU to write to the pages without first
 378  * unmapping the DMA mappings, or calling dma_sync_sg_for_cpu(). It is
 379  * therefore only legal to call this function if we know that the function
 380  * dma_sync_sg_for_cpu() is a NOP, and dma_sync_sg_for_device() is at most
 381  * a CPU write buffer flush.
 382  */
 383 static int vmw_ttm_map_for_dma(struct vmw_ttm_tt *vmw_tt)
 384 {
 385         struct device *dev = vmw_tt->dev_priv->dev->dev;
 386         int ret;
 387
 388         ret = dma_map_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.orig_nents,
 389                          DMA_BIDIRECTIONAL);
 390         if (unlikely(ret == 0))
 391                 return -ENOMEM;
 392
 393         vmw_tt->sgt.nents = ret;
 394
 395         return 0;
 396 }
 397
 398 /**
 399  * vmw_ttm_map_dma - Make sure TTM pages are visible to the device
 400  *
 401  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 402  *
 403  * Select the correct function for and make sure the TTM pages are
 404  * visible to the device. Allocate storage for the device mappings.
 405  * If a mapping has already been performed, indicated by the storage
 406  * pointer being non NULL, the function returns success.
 407  */
 408 static int vmw_ttm_map_dma(struct vmw_ttm_tt *vmw_tt)
 409 {
 410         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 411         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 412         struct vmw_sg_table *vsgt = &vmw_tt->vsgt;
 413         struct ttm_operation_ctx ctx = {
 414                 .interruptible = true,
 415                 .no_wait_gpu = false
 416         };
 417         struct vmw_piter iter;
 418         dma_addr_t old;
 419         int ret = 0;
 420         static size_t sgl_size;
 421         static size_t sgt_size;
 422
 423         if (vmw_tt->mapped)
 424                 return 0;
 425
 426         vsgt->mode = dev_priv->map_mode;
 427         vsgt->pages = vmw_tt->dma_ttm.ttm.pages;
 428         vsgt->num_pages = vmw_tt->dma_ttm.ttm.num_pages;
 429         vsgt->addrs = vmw_tt->dma_ttm.dma_address;
 430         vsgt->sgt = &vmw_tt->sgt;
 431
 432         switch (dev_priv->map_mode) {
 433         case vmw_dma_map_bind:
 434         case vmw_dma_map_populate:
 435                 if (unlikely(!sgl_size)) {
 436                         sgl_size = ttm_round_pot(sizeof(struct scatterlist));
 437                         sgt_size = ttm_round_pot(sizeof(struct sg_table));
 438                 }
 439                 vmw_tt->sg_alloc_size = sgt_size + sgl_size * vsgt->num_pages;
 440                 ret = ttm_mem_global_alloc(glob, vmw_tt->sg_alloc_size, &ctx);
 441                 if (unlikely(ret != 0))
 442                         return ret;
 443
 444                 ret = sg_alloc_table_from_pages(&vmw_tt->sgt, vsgt->pages,
 445                                                 vsgt->num_pages, 0,
 446                                                 (unsigned long)
 447                                                 vsgt->num_pages << PAGE_SHIFT,
 448                                                 GFP_KERNEL);
 449                 if (unlikely(ret != 0))
 450                         goto out_sg_alloc_fail;
 451
 452                 if (vsgt->num_pages > vmw_tt->sgt.nents) {
 453                         uint64_t over_alloc =
 454                                 sgl_size * (vsgt->num_pages -
 455                                             vmw_tt->sgt.nents);
 456
 457                         ttm_mem_global_free(glob, over_alloc);
 458                         vmw_tt->sg_alloc_size -= over_alloc;
 459                 }
 460
 461                 ret = vmw_ttm_map_for_dma(vmw_tt);
 462                 if (unlikely(ret != 0))
 463                         goto out_map_fail;
 464
 465                 break;
 466         default:
 467                 break;
 468         }
 469
 470         old = ~((dma_addr_t) 0);
 471         vmw_tt->vsgt.num_regions = 0;
 472         for (vmw_piter_start(&iter, vsgt, 0); vmw_piter_next(&iter);) {
 473                 dma_addr_t cur = vmw_piter_dma_addr(&iter);
 474
 475                 if (cur != old + PAGE_SIZE)
 476                         vmw_tt->vsgt.num_regions++;
 477                 old = cur;
 478         }
 479
 480         vmw_tt->mapped = true;
 481         return 0;
 482
 483 out_map_fail:
 484         sg_free_table(vmw_tt->vsgt.sgt);
 485         vmw_tt->vsgt.sgt = NULL;
 486 out_sg_alloc_fail:
 487         ttm_mem_global_free(glob, vmw_tt->sg_alloc_size);
 488         return ret;
 489 }
 490
 491 /**
 492  * vmw_ttm_unmap_dma - Tear down any TTM page device mappings
 493  *
 494  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 495  *
 496  * Tear down any previously set up device DMA mappings and free
 497  * any storage space allocated for them. If there are no mappings set up,
 498  * this function is a NOP.
 499  */
 500 static void vmw_ttm_unmap_dma(struct vmw_ttm_tt *vmw_tt)
 501 {
 502         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 503
 504         if (!vmw_tt->vsgt.sgt)
 505                 return;
 506
 507         switch (dev_priv->map_mode) {
 508         case vmw_dma_map_bind:
 509         case vmw_dma_map_populate:
 510                 vmw_ttm_unmap_from_dma(vmw_tt);
 511                 sg_free_table(vmw_tt->vsgt.sgt);
 512                 vmw_tt->vsgt.sgt = NULL;
 513                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 514                                     vmw_tt->sg_alloc_size);
 515                 break;
 516         default:
 517                 break;
 518         }
 519         vmw_tt->mapped = false;
 520 }
 521
 522
 523 /**
 524  * vmw_bo_map_dma - Make sure buffer object pages are visible to the device
 525  *
 526  * @bo: Pointer to a struct ttm_buffer_object
 527  *
 528  * Wrapper around vmw_ttm_map_dma, that takes a TTM buffer object pointer
 529  * instead of a pointer to a struct vmw_ttm_backend as argument.
 530  * Note that the buffer object must be either pinned or reserved before
 531  * calling this function.
 532  */
 533 int vmw_bo_map_dma(struct ttm_buffer_object *bo)
 534 {
 535         struct vmw_ttm_tt *vmw_tt =
 536                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 537
 538         return vmw_ttm_map_dma(vmw_tt);
 539 }
 540
 541
 542 /**
 543  * vmw_bo_unmap_dma - Make sure buffer object pages are visible to the device
 544  *
 545  * @bo: Pointer to a struct ttm_buffer_object
 546  *
 547  * Wrapper around vmw_ttm_unmap_dma, that takes a TTM buffer object pointer
 548  * instead of a pointer to a struct vmw_ttm_backend as argument.
 549  */
 550 void vmw_bo_unmap_dma(struct ttm_buffer_object *bo)
 551 {
 552         struct vmw_ttm_tt *vmw_tt =
 553                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 554
 555         vmw_ttm_unmap_dma(vmw_tt);
 556 }
 557
 558
 559 /**
 560  * vmw_bo_sg_table - Return a struct vmw_sg_table object for a
 561  * TTM buffer object
 562  *
 563  * @bo: Pointer to a struct ttm_buffer_object
 564  *
 565  * Returns a pointer to a struct vmw_sg_table object. The object should
 566  * not be freed after use.
 567  * Note that for the device addresses to be valid, the buffer object must
 568  * either be reserved or pinned.
 569  */
 570 const struct vmw_sg_table *vmw_bo_sg_table(struct ttm_buffer_object *bo)
 571 {
 572         struct vmw_ttm_tt *vmw_tt =
 573                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 574
 575         return &vmw_tt->vsgt;
 576 }
 577
 578
 579 static int vmw_ttm_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
 580 {
 581         struct vmw_ttm_tt *vmw_be =
 582                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 583         int ret;
 584
 585         ret = vmw_ttm_map_dma(vmw_be);
 586         if (unlikely(ret != 0))
 587                 return ret;
 588
 589         vmw_be->gmr_id = bo_mem->start;
 590         vmw_be->mem_type = bo_mem->mem_type;
 591
 592         switch (bo_mem->mem_type) {
 593         case VMW_PL_GMR:
 594                 return vmw_gmr_bind(vmw_be->dev_priv, &vmw_be->vsgt,
 595                                     ttm->num_pages, vmw_be->gmr_id);
 596         case VMW_PL_MOB:
 597                 if (unlikely(vmw_be->mob == NULL)) {
 598                         vmw_be->mob =
 599                                 vmw_mob_create(ttm->num_pages);
 600                         if (unlikely(vmw_be->mob == NULL))
 601                                 return -ENOMEM;
 602                 }
 603
 604                 return vmw_mob_bind(vmw_be->dev_priv, vmw_be->mob,
 605                                     &vmw_be->vsgt, ttm->num_pages,
 606                                     vmw_be->gmr_id);
 607         default:
 608                 BUG();
 609         }
 610         return 0;
 611 }
 612
 613 static int vmw_ttm_unbind(struct ttm_tt *ttm)
 614 {
 615         struct vmw_ttm_tt *vmw_be =
 616                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 617
 618         switch (vmw_be->mem_type) {
 619         case VMW_PL_GMR:
 620                 vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
 621                 break;
 622         case VMW_PL_MOB:
 623                 vmw_mob_unbind(vmw_be->dev_priv, vmw_be->mob);
 624                 break;
 625         default:
 626                 BUG();
 627         }
 628
 629         if (vmw_be->dev_priv->map_mode == vmw_dma_map_bind)
 630                 vmw_ttm_unmap_dma(vmw_be);
 631
 632         return 0;
 633 }
 634
 635
 636 static void vmw_ttm_destroy(struct ttm_tt *ttm)
 637 {
 638         struct vmw_ttm_tt *vmw_be =
 639                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 640
 641         vmw_ttm_unmap_dma(vmw_be);
 642         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 643                 ttm_dma_tt_fini(&vmw_be->dma_ttm);
 644         else
 645                 ttm_tt_fini(ttm);
 646
 647         if (vmw_be->mob)
 648                 vmw_mob_destroy(vmw_be->mob);
 649
 650         kfree(vmw_be);
 651 }
 652
 653
 654 static int vmw_ttm_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
 655 {
 656         struct vmw_ttm_tt *vmw_tt =
 657                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 658         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 659         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 660         int ret;
 661
 662         if (ttm->state != tt_unpopulated)
 663                 return 0;
 664
 665         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 666                 size_t size =
 667                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 668                 ret = ttm_mem_global_alloc(glob, size, ctx);
 669                 if (unlikely(ret != 0))
 670                         return ret;
 671
 672                 ret = ttm_dma_populate(&vmw_tt->dma_ttm, dev_priv->dev->dev,
 673                                         ctx);
 674                 if (unlikely(ret != 0))
 675                         ttm_mem_global_free(glob, size);
 676         } else
 677                 ret = ttm_pool_populate(ttm, ctx);
 678
 679         return ret;
 680 }
 681
 682 static void vmw_ttm_unpopulate(struct ttm_tt *ttm)
 683 {
 684         struct vmw_ttm_tt *vmw_tt = container_of(ttm, struct vmw_ttm_tt,
 685                                                  dma_ttm.ttm);
 686         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 687         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 688
 689
 690         if (vmw_tt->mob) {
 691                 vmw_mob_destroy(vmw_tt->mob);
 692                 vmw_tt->mob = NULL;
 693         }
 694
 695         vmw_ttm_unmap_dma(vmw_tt);
 696         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 697                 size_t size =
 698                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 699
 700                 ttm_dma_unpopulate(&vmw_tt->dma_ttm, dev_priv->dev->dev);
 701                 ttm_mem_global_free(glob, size);
 702         } else
 703                 ttm_pool_unpopulate(ttm);
 704 }
 705
 706 static struct ttm_backend_func vmw_ttm_func = {
 707         .bind = vmw_ttm_bind,
 708         .unbind = vmw_ttm_unbind,
 709         .destroy = vmw_ttm_destroy,
 710 };
 711
 712 static struct ttm_tt *vmw_ttm_tt_create(struct ttm_buffer_object *bo,
 713                                         uint32_t page_flags)
 714 {
 715         struct vmw_ttm_tt *vmw_be;
 716         int ret;
 717
 718         vmw_be = kzalloc(sizeof(*vmw_be), GFP_KERNEL);
 719         if (!vmw_be)
 720                 return NULL;
 721
 722         vmw_be->dma_ttm.ttm.func = &vmw_ttm_func;
 723         vmw_be->dev_priv = container_of(bo->bdev, struct vmw_private, bdev);
 724         vmw_be->mob = NULL;
 725
 726         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 727                 ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bo, page_flags);
 728         else
 729                 ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bo, page_flags);
 730         if (unlikely(ret != 0))
 731                 goto out_no_init;
 732
 733         return &vmw_be->dma_ttm.ttm;
 734 out_no_init:
 735         kfree(vmw_be);
 736         return NULL;
 737 }
 738
 739 static int vmw_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
 740 {
 741         return 0;
 742 }
 743
 744 static int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 745                       struct ttm_mem_type_manager *man)
 746 {
 747         switch (type) {
 748         case TTM_PL_SYSTEM:
 749                 /* System memory */
 750
 751                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 752                 man->available_caching = TTM_PL_FLAG_CACHED;
 753                 man->default_caching = TTM_PL_FLAG_CACHED;
 754                 break;
 755         case TTM_PL_VRAM:
 756                 /* "On-card" video ram */
 757                 man->func = &ttm_bo_manager_func;
 758                 man->gpu_offset = 0;
 759                 man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_MAPPABLE;
 760                 man->available_caching = TTM_PL_FLAG_CACHED;
 761                 man->default_caching = TTM_PL_FLAG_CACHED;
 762                 break;
 763         case VMW_PL_GMR:
 764         case VMW_PL_MOB:
 765                 /*
 766                  * "Guest Memory Regions" is an aperture like feature with
 767                  *  one slot per bo. There is an upper limit of the number of
 768                  *  slots as well as the bo size.
 769                  */
 770                 man->func = &vmw_gmrid_manager_func;
 771                 man->gpu_offset = 0;
 772                 man->flags = TTM_MEMTYPE_FLAG_CMA | TTM_MEMTYPE_FLAG_MAPPABLE;
 773                 man->available_caching = TTM_PL_FLAG_CACHED;
 774                 man->default_caching = TTM_PL_FLAG_CACHED;
 775                 break;
 776         default:
 777                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 778                 return -EINVAL;
 779         }
 780         return 0;
 781 }
 782
 783 static void vmw_evict_flags(struct ttm_buffer_object *bo,
 784                      struct ttm_placement *placement)
 785 {
 786         *placement = vmw_sys_placement;
 787 }
 788
 789 static int vmw_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 790 {
 791         struct ttm_object_file *tfile =
 792                 vmw_fpriv((struct drm_file *)filp->private_data)->tfile;
 793
 794         return vmw_user_bo_verify_access(bo, tfile);
 795 }
 796
 797 static int vmw_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 798 {
 799         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 800         struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
 801
 802         mem->bus.addr = NULL;
 803         mem->bus.is_iomem = false;
 804         mem->bus.offset = 0;
 805         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 806         mem->bus.base = 0;
 807         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 808                 return -EINVAL;
 809         switch (mem->mem_type) {
 810         case TTM_PL_SYSTEM:
 811         case VMW_PL_GMR:
 812         case VMW_PL_MOB:
 813                 return 0;
 814         case TTM_PL_VRAM:
 815                 mem->bus.offset = mem->start << PAGE_SHIFT;
 816                 mem->bus.base = dev_priv->vram_start;
 817                 mem->bus.is_iomem = true;
 818                 break;
 819         default:
 820                 return -EINVAL;
 821         }
 822         return 0;
 823 }
 824
 825 static void vmw_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 826 {
 827 }
 828
 829 static int vmw_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
 830 {
 831         return 0;
 832 }
 833
 834 /**
 835  * vmw_move_notify - TTM move_notify_callback
 836  *
 837  * @bo: The TTM buffer object about to move.
 838  * @mem: The struct ttm_mem_reg indicating to what memory
 839  *       region the move is taking place.
 840  *
 841  * Calls move_notify for all subsystems needing it.
 842  * (currently only resources).
 843  */
 844 static void vmw_move_notify(struct ttm_buffer_object *bo,
 845                             bool evict,
 846                             struct ttm_mem_reg *mem)
 847 {
 848         vmw_bo_move_notify(bo, mem);
 849         vmw_query_move_notify(bo, mem);
 850 }
 851
 852
 853 /**
 854  * vmw_swap_notify - TTM move_notify_callback
 855  *
 856  * @bo: The TTM buffer object about to be swapped out.
 857  */
 858 static void vmw_swap_notify(struct ttm_buffer_object *bo)
 859 {
 860         vmw_bo_swap_notify(bo);
 861         (void) ttm_bo_wait(bo, false, false);
 862 }
 863
 864
 865 struct ttm_bo_driver vmw_bo_driver = {
 866         .ttm_tt_create = &vmw_ttm_tt_create,
 867         .ttm_tt_populate = &vmw_ttm_populate,
 868         .ttm_tt_unpopulate = &vmw_ttm_unpopulate,
 869         .invalidate_caches = vmw_invalidate_caches,
 870         .init_mem_type = vmw_init_mem_type,
 871         .eviction_valuable = ttm_bo_eviction_valuable,
 872         .evict_flags = vmw_evict_flags,
 873         .move = NULL,
 874         .verify_access = vmw_verify_access,
 875         .move_notify = vmw_move_notify,
 876         .swap_notify = vmw_swap_notify,
 877         .fault_reserve_notify = &vmw_ttm_fault_reserve_notify,
 878         .io_mem_reserve = &vmw_ttm_io_mem_reserve,
 879         .io_mem_free = &vmw_ttm_io_mem_free,
 880 };