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         return __sg_page_iter_next(&viter->iter);
 270 }
 271
 272
 273 /**
 274  * Helper functions to return a pointer to the current page.
 275  *
 276  * @viter: Pointer to the iterator
 277  *
 278  * These functions return a pointer to the page currently
 279  * pointed to by @viter. Functions are selected depending on the
 280  * current mapping mode.
 281  */
 282 static struct page *__vmw_piter_non_sg_page(struct vmw_piter *viter)
 283 {
 284         return viter->pages[viter->i];
 285 }
 286
 287 static struct page *__vmw_piter_sg_page(struct vmw_piter *viter)
 288 {
 289         return sg_page_iter_page(&viter->iter);
 290 }
 291
 292
 293 /**
 294  * Helper functions to return the DMA address of the current page.
 295  *
 296  * @viter: Pointer to the iterator
 297  *
 298  * These functions return the DMA address of the page currently
 299  * pointed to by @viter. Functions are selected depending on the
 300  * current mapping mode.
 301  */
 302 static dma_addr_t __vmw_piter_phys_addr(struct vmw_piter *viter)
 303 {
 304         return page_to_phys(viter->pages[viter->i]);
 305 }
 306
 307 static dma_addr_t __vmw_piter_dma_addr(struct vmw_piter *viter)
 308 {
 309         return viter->addrs[viter->i];
 310 }
 311
 312 static dma_addr_t __vmw_piter_sg_addr(struct vmw_piter *viter)
 313 {
 314         return sg_page_iter_dma_address(&viter->iter);
 315 }
 316
 317
 318 /**
 319  * vmw_piter_start - Initialize a struct vmw_piter.
 320  *
 321  * @viter: Pointer to the iterator to initialize
 322  * @vsgt: Pointer to a struct vmw_sg_table to initialize from
 323  *
 324  * Note that we're following the convention of __sg_page_iter_start, so that
 325  * the iterator doesn't point to a valid page after initialization; it has
 326  * to be advanced one step first.
 327  */
 328 void vmw_piter_start(struct vmw_piter *viter, const struct vmw_sg_table *vsgt,
 329                      unsigned long p_offset)
 330 {
 331         viter->i = p_offset - 1;
 332         viter->num_pages = vsgt->num_pages;
 333         switch (vsgt->mode) {
 334         case vmw_dma_phys:
 335                 viter->next = &__vmw_piter_non_sg_next;
 336                 viter->dma_address = &__vmw_piter_phys_addr;
 337                 viter->page = &__vmw_piter_non_sg_page;
 338                 viter->pages = vsgt->pages;
 339                 break;
 340         case vmw_dma_alloc_coherent:
 341                 viter->next = &__vmw_piter_non_sg_next;
 342                 viter->dma_address = &__vmw_piter_dma_addr;
 343                 viter->page = &__vmw_piter_non_sg_page;
 344                 viter->addrs = vsgt->addrs;
 345                 viter->pages = vsgt->pages;
 346                 break;
 347         case vmw_dma_map_populate:
 348         case vmw_dma_map_bind:
 349                 viter->next = &__vmw_piter_sg_next;
 350                 viter->dma_address = &__vmw_piter_sg_addr;
 351                 viter->page = &__vmw_piter_sg_page;
 352                 __sg_page_iter_start(&viter->iter, vsgt->sgt->sgl,
 353                                      vsgt->sgt->orig_nents, p_offset);
 354                 break;
 355         default:
 356                 BUG();
 357         }
 358 }
 359
 360 /**
 361  * vmw_ttm_unmap_from_dma - unmap  device addresses previsouly mapped for
 362  * TTM pages
 363  *
 364  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 365  *
 366  * Used to free dma mappings previously mapped by vmw_ttm_map_for_dma.
 367  */
 368 static void vmw_ttm_unmap_from_dma(struct vmw_ttm_tt *vmw_tt)
 369 {
 370         struct device *dev = vmw_tt->dev_priv->dev->dev;
 371
 372         dma_unmap_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.nents,
 373                 DMA_BIDIRECTIONAL);
 374         vmw_tt->sgt.nents = vmw_tt->sgt.orig_nents;
 375 }
 376
 377 /**
 378  * vmw_ttm_map_for_dma - map TTM pages to get device addresses
 379  *
 380  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 381  *
 382  * This function is used to get device addresses from the kernel DMA layer.
 383  * However, it's violating the DMA API in that when this operation has been
 384  * performed, it's illegal for the CPU to write to the pages without first
 385  * unmapping the DMA mappings, or calling dma_sync_sg_for_cpu(). It is
 386  * therefore only legal to call this function if we know that the function
 387  * dma_sync_sg_for_cpu() is a NOP, and dma_sync_sg_for_device() is at most
 388  * a CPU write buffer flush.
 389  */
 390 static int vmw_ttm_map_for_dma(struct vmw_ttm_tt *vmw_tt)
 391 {
 392         struct device *dev = vmw_tt->dev_priv->dev->dev;
 393         int ret;
 394
 395         ret = dma_map_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.orig_nents,
 396                          DMA_BIDIRECTIONAL);
 397         if (unlikely(ret == 0))
 398                 return -ENOMEM;
 399
 400         vmw_tt->sgt.nents = ret;
 401
 402         return 0;
 403 }
 404
 405 /**
 406  * vmw_ttm_map_dma - Make sure TTM pages are visible to the device
 407  *
 408  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 409  *
 410  * Select the correct function for and make sure the TTM pages are
 411  * visible to the device. Allocate storage for the device mappings.
 412  * If a mapping has already been performed, indicated by the storage
 413  * pointer being non NULL, the function returns success.
 414  */
 415 static int vmw_ttm_map_dma(struct vmw_ttm_tt *vmw_tt)
 416 {
 417         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 418         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 419         struct vmw_sg_table *vsgt = &vmw_tt->vsgt;
 420         struct ttm_operation_ctx ctx = {
 421                 .interruptible = true,
 422                 .no_wait_gpu = false
 423         };
 424         struct vmw_piter iter;
 425         dma_addr_t old;
 426         int ret = 0;
 427         static size_t sgl_size;
 428         static size_t sgt_size;
 429
 430         if (vmw_tt->mapped)
 431                 return 0;
 432
 433         vsgt->mode = dev_priv->map_mode;
 434         vsgt->pages = vmw_tt->dma_ttm.ttm.pages;
 435         vsgt->num_pages = vmw_tt->dma_ttm.ttm.num_pages;
 436         vsgt->addrs = vmw_tt->dma_ttm.dma_address;
 437         vsgt->sgt = &vmw_tt->sgt;
 438
 439         switch (dev_priv->map_mode) {
 440         case vmw_dma_map_bind:
 441         case vmw_dma_map_populate:
 442                 if (unlikely(!sgl_size)) {
 443                         sgl_size = ttm_round_pot(sizeof(struct scatterlist));
 444                         sgt_size = ttm_round_pot(sizeof(struct sg_table));
 445                 }
 446                 vmw_tt->sg_alloc_size = sgt_size + sgl_size * vsgt->num_pages;
 447                 ret = ttm_mem_global_alloc(glob, vmw_tt->sg_alloc_size, &ctx);
 448                 if (unlikely(ret != 0))
 449                         return ret;
 450
 451                 ret = sg_alloc_table_from_pages(&vmw_tt->sgt, vsgt->pages,
 452                                                 vsgt->num_pages, 0,
 453                                                 (unsigned long)
 454                                                 vsgt->num_pages << PAGE_SHIFT,
 455                                                 GFP_KERNEL);
 456                 if (unlikely(ret != 0))
 457                         goto out_sg_alloc_fail;
 458
 459                 if (vsgt->num_pages > vmw_tt->sgt.nents) {
 460                         uint64_t over_alloc =
 461                                 sgl_size * (vsgt->num_pages -
 462                                             vmw_tt->sgt.nents);
 463
 464                         ttm_mem_global_free(glob, over_alloc);
 465                         vmw_tt->sg_alloc_size -= over_alloc;
 466                 }
 467
 468                 ret = vmw_ttm_map_for_dma(vmw_tt);
 469                 if (unlikely(ret != 0))
 470                         goto out_map_fail;
 471
 472                 break;
 473         default:
 474                 break;
 475         }
 476
 477         old = ~((dma_addr_t) 0);
 478         vmw_tt->vsgt.num_regions = 0;
 479         for (vmw_piter_start(&iter, vsgt, 0); vmw_piter_next(&iter);) {
 480                 dma_addr_t cur = vmw_piter_dma_addr(&iter);
 481
 482                 if (cur != old + PAGE_SIZE)
 483                         vmw_tt->vsgt.num_regions++;
 484                 old = cur;
 485         }
 486
 487         vmw_tt->mapped = true;
 488         return 0;
 489
 490 out_map_fail:
 491         sg_free_table(vmw_tt->vsgt.sgt);
 492         vmw_tt->vsgt.sgt = NULL;
 493 out_sg_alloc_fail:
 494         ttm_mem_global_free(glob, vmw_tt->sg_alloc_size);
 495         return ret;
 496 }
 497
 498 /**
 499  * vmw_ttm_unmap_dma - Tear down any TTM page device mappings
 500  *
 501  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 502  *
 503  * Tear down any previously set up device DMA mappings and free
 504  * any storage space allocated for them. If there are no mappings set up,
 505  * this function is a NOP.
 506  */
 507 static void vmw_ttm_unmap_dma(struct vmw_ttm_tt *vmw_tt)
 508 {
 509         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 510
 511         if (!vmw_tt->vsgt.sgt)
 512                 return;
 513
 514         switch (dev_priv->map_mode) {
 515         case vmw_dma_map_bind:
 516         case vmw_dma_map_populate:
 517                 vmw_ttm_unmap_from_dma(vmw_tt);
 518                 sg_free_table(vmw_tt->vsgt.sgt);
 519                 vmw_tt->vsgt.sgt = NULL;
 520                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 521                                     vmw_tt->sg_alloc_size);
 522                 break;
 523         default:
 524                 break;
 525         }
 526         vmw_tt->mapped = false;
 527 }
 528
 529
 530 /**
 531  * vmw_bo_map_dma - Make sure buffer object pages are visible to the device
 532  *
 533  * @bo: Pointer to a struct ttm_buffer_object
 534  *
 535  * Wrapper around vmw_ttm_map_dma, that takes a TTM buffer object pointer
 536  * instead of a pointer to a struct vmw_ttm_backend as argument.
 537  * Note that the buffer object must be either pinned or reserved before
 538  * calling this function.
 539  */
 540 int vmw_bo_map_dma(struct ttm_buffer_object *bo)
 541 {
 542         struct vmw_ttm_tt *vmw_tt =
 543                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 544
 545         return vmw_ttm_map_dma(vmw_tt);
 546 }
 547
 548
 549 /**
 550  * vmw_bo_unmap_dma - Make sure buffer object pages are visible to the device
 551  *
 552  * @bo: Pointer to a struct ttm_buffer_object
 553  *
 554  * Wrapper around vmw_ttm_unmap_dma, that takes a TTM buffer object pointer
 555  * instead of a pointer to a struct vmw_ttm_backend as argument.
 556  */
 557 void vmw_bo_unmap_dma(struct ttm_buffer_object *bo)
 558 {
 559         struct vmw_ttm_tt *vmw_tt =
 560                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 561
 562         vmw_ttm_unmap_dma(vmw_tt);
 563 }
 564
 565
 566 /**
 567  * vmw_bo_sg_table - Return a struct vmw_sg_table object for a
 568  * TTM buffer object
 569  *
 570  * @bo: Pointer to a struct ttm_buffer_object
 571  *
 572  * Returns a pointer to a struct vmw_sg_table object. The object should
 573  * not be freed after use.
 574  * Note that for the device addresses to be valid, the buffer object must
 575  * either be reserved or pinned.
 576  */
 577 const struct vmw_sg_table *vmw_bo_sg_table(struct ttm_buffer_object *bo)
 578 {
 579         struct vmw_ttm_tt *vmw_tt =
 580                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 581
 582         return &vmw_tt->vsgt;
 583 }
 584
 585
 586 static int vmw_ttm_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
 587 {
 588         struct vmw_ttm_tt *vmw_be =
 589                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 590         int ret;
 591
 592         ret = vmw_ttm_map_dma(vmw_be);
 593         if (unlikely(ret != 0))
 594                 return ret;
 595
 596         vmw_be->gmr_id = bo_mem->start;
 597         vmw_be->mem_type = bo_mem->mem_type;
 598
 599         switch (bo_mem->mem_type) {
 600         case VMW_PL_GMR:
 601                 return vmw_gmr_bind(vmw_be->dev_priv, &vmw_be->vsgt,
 602                                     ttm->num_pages, vmw_be->gmr_id);
 603         case VMW_PL_MOB:
 604                 if (unlikely(vmw_be->mob == NULL)) {
 605                         vmw_be->mob =
 606                                 vmw_mob_create(ttm->num_pages);
 607                         if (unlikely(vmw_be->mob == NULL))
 608                                 return -ENOMEM;
 609                 }
 610
 611                 return vmw_mob_bind(vmw_be->dev_priv, vmw_be->mob,
 612                                     &vmw_be->vsgt, ttm->num_pages,
 613                                     vmw_be->gmr_id);
 614         default:
 615                 BUG();
 616         }
 617         return 0;
 618 }
 619
 620 static int vmw_ttm_unbind(struct ttm_tt *ttm)
 621 {
 622         struct vmw_ttm_tt *vmw_be =
 623                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 624
 625         switch (vmw_be->mem_type) {
 626         case VMW_PL_GMR:
 627                 vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
 628                 break;
 629         case VMW_PL_MOB:
 630                 vmw_mob_unbind(vmw_be->dev_priv, vmw_be->mob);
 631                 break;
 632         default:
 633                 BUG();
 634         }
 635
 636         if (vmw_be->dev_priv->map_mode == vmw_dma_map_bind)
 637                 vmw_ttm_unmap_dma(vmw_be);
 638
 639         return 0;
 640 }
 641
 642
 643 static void vmw_ttm_destroy(struct ttm_tt *ttm)
 644 {
 645         struct vmw_ttm_tt *vmw_be =
 646                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 647
 648         vmw_ttm_unmap_dma(vmw_be);
 649         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 650                 ttm_dma_tt_fini(&vmw_be->dma_ttm);
 651         else
 652                 ttm_tt_fini(ttm);
 653
 654         if (vmw_be->mob)
 655                 vmw_mob_destroy(vmw_be->mob);
 656
 657         kfree(vmw_be);
 658 }
 659
 660
 661 static int vmw_ttm_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
 662 {
 663         struct vmw_ttm_tt *vmw_tt =
 664                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 665         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 666         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 667         int ret;
 668
 669         if (ttm->state != tt_unpopulated)
 670                 return 0;
 671
 672         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 673                 size_t size =
 674                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 675                 ret = ttm_mem_global_alloc(glob, size, ctx);
 676                 if (unlikely(ret != 0))
 677                         return ret;
 678
 679                 ret = ttm_dma_populate(&vmw_tt->dma_ttm, dev_priv->dev->dev,
 680                                         ctx);
 681                 if (unlikely(ret != 0))
 682                         ttm_mem_global_free(glob, size);
 683         } else
 684                 ret = ttm_pool_populate(ttm, ctx);
 685
 686         return ret;
 687 }
 688
 689 static void vmw_ttm_unpopulate(struct ttm_tt *ttm)
 690 {
 691         struct vmw_ttm_tt *vmw_tt = container_of(ttm, struct vmw_ttm_tt,
 692                                                  dma_ttm.ttm);
 693         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 694         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 695
 696
 697         if (vmw_tt->mob) {
 698                 vmw_mob_destroy(vmw_tt->mob);
 699                 vmw_tt->mob = NULL;
 700         }
 701
 702         vmw_ttm_unmap_dma(vmw_tt);
 703         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 704                 size_t size =
 705                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 706
 707                 ttm_dma_unpopulate(&vmw_tt->dma_ttm, dev_priv->dev->dev);
 708                 ttm_mem_global_free(glob, size);
 709         } else
 710                 ttm_pool_unpopulate(ttm);
 711 }
 712
 713 static struct ttm_backend_func vmw_ttm_func = {
 714         .bind = vmw_ttm_bind,
 715         .unbind = vmw_ttm_unbind,
 716         .destroy = vmw_ttm_destroy,
 717 };
 718
 719 static struct ttm_tt *vmw_ttm_tt_create(struct ttm_buffer_object *bo,
 720                                         uint32_t page_flags)
 721 {
 722         struct vmw_ttm_tt *vmw_be;
 723         int ret;
 724
 725         vmw_be = kzalloc(sizeof(*vmw_be), GFP_KERNEL);
 726         if (!vmw_be)
 727                 return NULL;
 728
 729         vmw_be->dma_ttm.ttm.func = &vmw_ttm_func;
 730         vmw_be->dev_priv = container_of(bo->bdev, struct vmw_private, bdev);
 731         vmw_be->mob = NULL;
 732
 733         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 734                 ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bo, page_flags);
 735         else
 736                 ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bo, page_flags);
 737         if (unlikely(ret != 0))
 738                 goto out_no_init;
 739
 740         return &vmw_be->dma_ttm.ttm;
 741 out_no_init:
 742         kfree(vmw_be);
 743         return NULL;
 744 }
 745
 746 static int vmw_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
 747 {
 748         return 0;
 749 }
 750
 751 static int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 752                       struct ttm_mem_type_manager *man)
 753 {
 754         switch (type) {
 755         case TTM_PL_SYSTEM:
 756                 /* System memory */
 757
 758                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 759                 man->available_caching = TTM_PL_FLAG_CACHED;
 760                 man->default_caching = TTM_PL_FLAG_CACHED;
 761                 break;
 762         case TTM_PL_VRAM:
 763                 /* "On-card" video ram */
 764                 man->func = &ttm_bo_manager_func;
 765                 man->gpu_offset = 0;
 766                 man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_MAPPABLE;
 767                 man->available_caching = TTM_PL_FLAG_CACHED;
 768                 man->default_caching = TTM_PL_FLAG_CACHED;
 769                 break;
 770         case VMW_PL_GMR:
 771         case VMW_PL_MOB:
 772                 /*
 773                  * "Guest Memory Regions" is an aperture like feature with
 774                  *  one slot per bo. There is an upper limit of the number of
 775                  *  slots as well as the bo size.
 776                  */
 777                 man->func = &vmw_gmrid_manager_func;
 778                 man->gpu_offset = 0;
 779                 man->flags = TTM_MEMTYPE_FLAG_CMA | TTM_MEMTYPE_FLAG_MAPPABLE;
 780                 man->available_caching = TTM_PL_FLAG_CACHED;
 781                 man->default_caching = TTM_PL_FLAG_CACHED;
 782                 break;
 783         default:
 784                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 785                 return -EINVAL;
 786         }
 787         return 0;
 788 }
 789
 790 static void vmw_evict_flags(struct ttm_buffer_object *bo,
 791                      struct ttm_placement *placement)
 792 {
 793         *placement = vmw_sys_placement;
 794 }
 795
 796 static int vmw_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 797 {
 798         struct ttm_object_file *tfile =
 799                 vmw_fpriv((struct drm_file *)filp->private_data)->tfile;
 800
 801         return vmw_user_bo_verify_access(bo, tfile);
 802 }
 803
 804 static int vmw_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 805 {
 806         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 807         struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
 808
 809         mem->bus.addr = NULL;
 810         mem->bus.is_iomem = false;
 811         mem->bus.offset = 0;
 812         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 813         mem->bus.base = 0;
 814         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 815                 return -EINVAL;
 816         switch (mem->mem_type) {
 817         case TTM_PL_SYSTEM:
 818         case VMW_PL_GMR:
 819         case VMW_PL_MOB:
 820                 return 0;
 821         case TTM_PL_VRAM:
 822                 mem->bus.offset = mem->start << PAGE_SHIFT;
 823                 mem->bus.base = dev_priv->vram_start;
 824                 mem->bus.is_iomem = true;
 825                 break;
 826         default:
 827                 return -EINVAL;
 828         }
 829         return 0;
 830 }
 831
 832 static void vmw_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 833 {
 834 }
 835
 836 static int vmw_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
 837 {
 838         return 0;
 839 }
 840
 841 /**
 842  * vmw_move_notify - TTM move_notify_callback
 843  *
 844  * @bo: The TTM buffer object about to move.
 845  * @mem: The struct ttm_mem_reg indicating to what memory
 846  *       region the move is taking place.
 847  *
 848  * Calls move_notify for all subsystems needing it.
 849  * (currently only resources).
 850  */
 851 static void vmw_move_notify(struct ttm_buffer_object *bo,
 852                             bool evict,
 853                             struct ttm_mem_reg *mem)
 854 {
 855         vmw_bo_move_notify(bo, mem);
 856         vmw_query_move_notify(bo, mem);
 857 }
 858
 859
 860 /**
 861  * vmw_swap_notify - TTM move_notify_callback
 862  *
 863  * @bo: The TTM buffer object about to be swapped out.
 864  */
 865 static void vmw_swap_notify(struct ttm_buffer_object *bo)
 866 {
 867         vmw_bo_swap_notify(bo);
 868         (void) ttm_bo_wait(bo, false, false);
 869 }
 870
 871
 872 struct ttm_bo_driver vmw_bo_driver = {
 873         .ttm_tt_create = &vmw_ttm_tt_create,
 874         .ttm_tt_populate = &vmw_ttm_populate,
 875         .ttm_tt_unpopulate = &vmw_ttm_unpopulate,
 876         .invalidate_caches = vmw_invalidate_caches,
 877         .init_mem_type = vmw_init_mem_type,
 878         .eviction_valuable = ttm_bo_eviction_valuable,
 879         .evict_flags = vmw_evict_flags,
 880         .move = NULL,
 881         .verify_access = vmw_verify_access,
 882         .move_notify = vmw_move_notify,
 883         .swap_notify = vmw_swap_notify,
 884         .fault_reserve_notify = &vmw_ttm_fault_reserve_notify,
 885         .io_mem_reserve = &vmw_ttm_io_mem_reserve,
 886         .io_mem_free = &vmw_ttm_io_mem_free,
 887 };