kernel/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   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 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 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 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 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 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 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 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 struct ttm_placement vmw_vram_placement = {
  76         .num_placement = 1,
  77         .placement = &vram_placement_flags,
  78         .num_busy_placement = 1,
  79         .busy_placement = &vram_placement_flags
  80 };
  81
  82 static struct ttm_place vram_gmr_placement_flags[] = {
  83         {
  84                 .fpfn = 0,
  85                 .lpfn = 0,
  86                 .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED
  87         }, {
  88                 .fpfn = 0,
  89                 .lpfn = 0,
  90                 .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
  91         }
  92 };
  93
  94 static struct ttm_place gmr_vram_placement_flags[] = {
  95         {
  96                 .fpfn = 0,
  97                 .lpfn = 0,
  98                 .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
  99         }, {
 100                 .fpfn = 0,
 101                 .lpfn = 0,
 102                 .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED
 103         }
 104 };
 105
 106 struct ttm_placement vmw_vram_gmr_placement = {
 107         .num_placement = 2,
 108         .placement = vram_gmr_placement_flags,
 109         .num_busy_placement = 1,
 110         .busy_placement = &gmr_placement_flags
 111 };
 112
 113 static struct ttm_place vram_gmr_ne_placement_flags[] = {
 114         {
 115                 .fpfn = 0,
 116                 .lpfn = 0,
 117                 .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED |
 118                          TTM_PL_FLAG_NO_EVICT
 119         }, {
 120                 .fpfn = 0,
 121                 .lpfn = 0,
 122                 .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED |
 123                          TTM_PL_FLAG_NO_EVICT
 124         }
 125 };
 126
 127 struct ttm_placement vmw_vram_gmr_ne_placement = {
 128         .num_placement = 2,
 129         .placement = vram_gmr_ne_placement_flags,
 130         .num_busy_placement = 1,
 131         .busy_placement = &gmr_ne_placement_flags
 132 };
 133
 134 struct ttm_placement vmw_vram_sys_placement = {
 135         .num_placement = 1,
 136         .placement = &vram_placement_flags,
 137         .num_busy_placement = 1,
 138         .busy_placement = &sys_placement_flags
 139 };
 140
 141 struct ttm_placement vmw_vram_ne_placement = {
 142         .num_placement = 1,
 143         .placement = &vram_ne_placement_flags,
 144         .num_busy_placement = 1,
 145         .busy_placement = &vram_ne_placement_flags
 146 };
 147
 148 struct ttm_placement vmw_sys_placement = {
 149         .num_placement = 1,
 150         .placement = &sys_placement_flags,
 151         .num_busy_placement = 1,
 152         .busy_placement = &sys_placement_flags
 153 };
 154
 155 struct ttm_placement vmw_sys_ne_placement = {
 156         .num_placement = 1,
 157         .placement = &sys_ne_placement_flags,
 158         .num_busy_placement = 1,
 159         .busy_placement = &sys_ne_placement_flags
 160 };
 161
 162 static struct ttm_place evictable_placement_flags[] = {
 163         {
 164                 .fpfn = 0,
 165                 .lpfn = 0,
 166                 .flags = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED
 167         }, {
 168                 .fpfn = 0,
 169                 .lpfn = 0,
 170                 .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED
 171         }, {
 172                 .fpfn = 0,
 173                 .lpfn = 0,
 174                 .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
 175         }, {
 176                 .fpfn = 0,
 177                 .lpfn = 0,
 178                 .flags = VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED
 179         }
 180 };
 181
 182 struct ttm_placement vmw_evictable_placement = {
 183         .num_placement = 4,
 184         .placement = evictable_placement_flags,
 185         .num_busy_placement = 1,
 186         .busy_placement = &sys_placement_flags
 187 };
 188
 189 struct ttm_placement vmw_srf_placement = {
 190         .num_placement = 1,
 191         .num_busy_placement = 2,
 192         .placement = &gmr_placement_flags,
 193         .busy_placement = gmr_vram_placement_flags
 194 };
 195
 196 struct ttm_placement vmw_mob_placement = {
 197         .num_placement = 1,
 198         .num_busy_placement = 1,
 199         .placement = &mob_placement_flags,
 200         .busy_placement = &mob_placement_flags
 201 };
 202
 203 struct vmw_ttm_tt {
 204         struct ttm_dma_tt dma_ttm;
 205         struct vmw_private *dev_priv;
 206         int gmr_id;
 207         struct vmw_mob *mob;
 208         int mem_type;
 209         struct sg_table sgt;
 210         struct vmw_sg_table vsgt;
 211         uint64_t sg_alloc_size;
 212         bool mapped;
 213 };
 214
 215 const size_t vmw_tt_size = sizeof(struct vmw_ttm_tt);
 216
 217 /**
 218  * Helper functions to advance a struct vmw_piter iterator.
 219  *
 220  * @viter: Pointer to the iterator.
 221  *
 222  * These functions return false if past the end of the list,
 223  * true otherwise. Functions are selected depending on the current
 224  * DMA mapping mode.
 225  */
 226 static bool __vmw_piter_non_sg_next(struct vmw_piter *viter)
 227 {
 228         return ++(viter->i) < viter->num_pages;
 229 }
 230
 231 static bool __vmw_piter_sg_next(struct vmw_piter *viter)
 232 {
 233         return __sg_page_iter_next(&viter->iter);
 234 }
 235
 236
 237 /**
 238  * Helper functions to return a pointer to the current page.
 239  *
 240  * @viter: Pointer to the iterator
 241  *
 242  * These functions return a pointer to the page currently
 243  * pointed to by @viter. Functions are selected depending on the
 244  * current mapping mode.
 245  */
 246 static struct page *__vmw_piter_non_sg_page(struct vmw_piter *viter)
 247 {
 248         return viter->pages[viter->i];
 249 }
 250
 251 static struct page *__vmw_piter_sg_page(struct vmw_piter *viter)
 252 {
 253         return sg_page_iter_page(&viter->iter);
 254 }
 255
 256
 257 /**
 258  * Helper functions to return the DMA address of the current page.
 259  *
 260  * @viter: Pointer to the iterator
 261  *
 262  * These functions return the DMA address of the page currently
 263  * pointed to by @viter. Functions are selected depending on the
 264  * current mapping mode.
 265  */
 266 static dma_addr_t __vmw_piter_phys_addr(struct vmw_piter *viter)
 267 {
 268         return page_to_phys(viter->pages[viter->i]);
 269 }
 270
 271 static dma_addr_t __vmw_piter_dma_addr(struct vmw_piter *viter)
 272 {
 273         return viter->addrs[viter->i];
 274 }
 275
 276 static dma_addr_t __vmw_piter_sg_addr(struct vmw_piter *viter)
 277 {
 278         return sg_page_iter_dma_address(&viter->iter);
 279 }
 280
 281
 282 /**
 283  * vmw_piter_start - Initialize a struct vmw_piter.
 284  *
 285  * @viter: Pointer to the iterator to initialize
 286  * @vsgt: Pointer to a struct vmw_sg_table to initialize from
 287  *
 288  * Note that we're following the convention of __sg_page_iter_start, so that
 289  * the iterator doesn't point to a valid page after initialization; it has
 290  * to be advanced one step first.
 291  */
 292 void vmw_piter_start(struct vmw_piter *viter, const struct vmw_sg_table *vsgt,
 293                      unsigned long p_offset)
 294 {
 295         viter->i = p_offset - 1;
 296         viter->num_pages = vsgt->num_pages;
 297         switch (vsgt->mode) {
 298         case vmw_dma_phys:
 299                 viter->next = &__vmw_piter_non_sg_next;
 300                 viter->dma_address = &__vmw_piter_phys_addr;
 301                 viter->page = &__vmw_piter_non_sg_page;
 302                 viter->pages = vsgt->pages;
 303                 break;
 304         case vmw_dma_alloc_coherent:
 305                 viter->next = &__vmw_piter_non_sg_next;
 306                 viter->dma_address = &__vmw_piter_dma_addr;
 307                 viter->page = &__vmw_piter_non_sg_page;
 308                 viter->addrs = vsgt->addrs;
 309                 viter->pages = vsgt->pages;
 310                 break;
 311         case vmw_dma_map_populate:
 312         case vmw_dma_map_bind:
 313                 viter->next = &__vmw_piter_sg_next;
 314                 viter->dma_address = &__vmw_piter_sg_addr;
 315                 viter->page = &__vmw_piter_sg_page;
 316                 __sg_page_iter_start(&viter->iter, vsgt->sgt->sgl,
 317                                      vsgt->sgt->orig_nents, p_offset);
 318                 break;
 319         default:
 320                 BUG();
 321         }
 322 }
 323
 324 /**
 325  * vmw_ttm_unmap_from_dma - unmap  device addresses previsouly mapped for
 326  * TTM pages
 327  *
 328  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 329  *
 330  * Used to free dma mappings previously mapped by vmw_ttm_map_for_dma.
 331  */
 332 static void vmw_ttm_unmap_from_dma(struct vmw_ttm_tt *vmw_tt)
 333 {
 334         struct device *dev = vmw_tt->dev_priv->dev->dev;
 335
 336         dma_unmap_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.nents,
 337                 DMA_BIDIRECTIONAL);
 338         vmw_tt->sgt.nents = vmw_tt->sgt.orig_nents;
 339 }
 340
 341 /**
 342  * vmw_ttm_map_for_dma - map TTM pages to get device addresses
 343  *
 344  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 345  *
 346  * This function is used to get device addresses from the kernel DMA layer.
 347  * However, it's violating the DMA API in that when this operation has been
 348  * performed, it's illegal for the CPU to write to the pages without first
 349  * unmapping the DMA mappings, or calling dma_sync_sg_for_cpu(). It is
 350  * therefore only legal to call this function if we know that the function
 351  * dma_sync_sg_for_cpu() is a NOP, and dma_sync_sg_for_device() is at most
 352  * a CPU write buffer flush.
 353  */
 354 static int vmw_ttm_map_for_dma(struct vmw_ttm_tt *vmw_tt)
 355 {
 356         struct device *dev = vmw_tt->dev_priv->dev->dev;
 357         int ret;
 358
 359         ret = dma_map_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.orig_nents,
 360                          DMA_BIDIRECTIONAL);
 361         if (unlikely(ret == 0))
 362                 return -ENOMEM;
 363
 364         vmw_tt->sgt.nents = ret;
 365
 366         return 0;
 367 }
 368
 369 /**
 370  * vmw_ttm_map_dma - Make sure TTM pages are visible to the device
 371  *
 372  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 373  *
 374  * Select the correct function for and make sure the TTM pages are
 375  * visible to the device. Allocate storage for the device mappings.
 376  * If a mapping has already been performed, indicated by the storage
 377  * pointer being non NULL, the function returns success.
 378  */
 379 static int vmw_ttm_map_dma(struct vmw_ttm_tt *vmw_tt)
 380 {
 381         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 382         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 383         struct vmw_sg_table *vsgt = &vmw_tt->vsgt;
 384         struct vmw_piter iter;
 385         dma_addr_t old;
 386         int ret = 0;
 387         static size_t sgl_size;
 388         static size_t sgt_size;
 389
 390         if (vmw_tt->mapped)
 391                 return 0;
 392
 393         vsgt->mode = dev_priv->map_mode;
 394         vsgt->pages = vmw_tt->dma_ttm.ttm.pages;
 395         vsgt->num_pages = vmw_tt->dma_ttm.ttm.num_pages;
 396         vsgt->addrs = vmw_tt->dma_ttm.dma_address;
 397         vsgt->sgt = &vmw_tt->sgt;
 398
 399         switch (dev_priv->map_mode) {
 400         case vmw_dma_map_bind:
 401         case vmw_dma_map_populate:
 402                 if (unlikely(!sgl_size)) {
 403                         sgl_size = ttm_round_pot(sizeof(struct scatterlist));
 404                         sgt_size = ttm_round_pot(sizeof(struct sg_table));
 405                 }
 406                 vmw_tt->sg_alloc_size = sgt_size + sgl_size * vsgt->num_pages;
 407                 ret = ttm_mem_global_alloc(glob, vmw_tt->sg_alloc_size, false,
 408                                            true);
 409                 if (unlikely(ret != 0))
 410                         return ret;
 411
 412                 ret = sg_alloc_table_from_pages(&vmw_tt->sgt, vsgt->pages,
 413                                                 vsgt->num_pages, 0,
 414                                                 (unsigned long)
 415                                                 vsgt->num_pages << PAGE_SHIFT,
 416                                                 GFP_KERNEL);
 417                 if (unlikely(ret != 0))
 418                         goto out_sg_alloc_fail;
 419
 420                 if (vsgt->num_pages > vmw_tt->sgt.nents) {
 421                         uint64_t over_alloc =
 422                                 sgl_size * (vsgt->num_pages -
 423                                             vmw_tt->sgt.nents);
 424
 425                         ttm_mem_global_free(glob, over_alloc);
 426                         vmw_tt->sg_alloc_size -= over_alloc;
 427                 }
 428
 429                 ret = vmw_ttm_map_for_dma(vmw_tt);
 430                 if (unlikely(ret != 0))
 431                         goto out_map_fail;
 432
 433                 break;
 434         default:
 435                 break;
 436         }
 437
 438         old = ~((dma_addr_t) 0);
 439         vmw_tt->vsgt.num_regions = 0;
 440         for (vmw_piter_start(&iter, vsgt, 0); vmw_piter_next(&iter);) {
 441                 dma_addr_t cur = vmw_piter_dma_addr(&iter);
 442
 443                 if (cur != old + PAGE_SIZE)
 444                         vmw_tt->vsgt.num_regions++;
 445                 old = cur;
 446         }
 447
 448         vmw_tt->mapped = true;
 449         return 0;
 450
 451 out_map_fail:
 452         sg_free_table(vmw_tt->vsgt.sgt);
 453         vmw_tt->vsgt.sgt = NULL;
 454 out_sg_alloc_fail:
 455         ttm_mem_global_free(glob, vmw_tt->sg_alloc_size);
 456         return ret;
 457 }
 458
 459 /**
 460  * vmw_ttm_unmap_dma - Tear down any TTM page device mappings
 461  *
 462  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 463  *
 464  * Tear down any previously set up device DMA mappings and free
 465  * any storage space allocated for them. If there are no mappings set up,
 466  * this function is a NOP.
 467  */
 468 static void vmw_ttm_unmap_dma(struct vmw_ttm_tt *vmw_tt)
 469 {
 470         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 471
 472         if (!vmw_tt->vsgt.sgt)
 473                 return;
 474
 475         switch (dev_priv->map_mode) {
 476         case vmw_dma_map_bind:
 477         case vmw_dma_map_populate:
 478                 vmw_ttm_unmap_from_dma(vmw_tt);
 479                 sg_free_table(vmw_tt->vsgt.sgt);
 480                 vmw_tt->vsgt.sgt = NULL;
 481                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 482                                     vmw_tt->sg_alloc_size);
 483                 break;
 484         default:
 485                 break;
 486         }
 487         vmw_tt->mapped = false;
 488 }
 489
 490
 491 /**
 492  * vmw_bo_map_dma - Make sure buffer object pages are visible to the device
 493  *
 494  * @bo: Pointer to a struct ttm_buffer_object
 495  *
 496  * Wrapper around vmw_ttm_map_dma, that takes a TTM buffer object pointer
 497  * instead of a pointer to a struct vmw_ttm_backend as argument.
 498  * Note that the buffer object must be either pinned or reserved before
 499  * calling this function.
 500  */
 501 int vmw_bo_map_dma(struct ttm_buffer_object *bo)
 502 {
 503         struct vmw_ttm_tt *vmw_tt =
 504                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 505
 506         return vmw_ttm_map_dma(vmw_tt);
 507 }
 508
 509
 510 /**
 511  * vmw_bo_unmap_dma - Make sure buffer object pages are visible to the device
 512  *
 513  * @bo: Pointer to a struct ttm_buffer_object
 514  *
 515  * Wrapper around vmw_ttm_unmap_dma, that takes a TTM buffer object pointer
 516  * instead of a pointer to a struct vmw_ttm_backend as argument.
 517  */
 518 void vmw_bo_unmap_dma(struct ttm_buffer_object *bo)
 519 {
 520         struct vmw_ttm_tt *vmw_tt =
 521                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 522
 523         vmw_ttm_unmap_dma(vmw_tt);
 524 }
 525
 526
 527 /**
 528  * vmw_bo_sg_table - Return a struct vmw_sg_table object for a
 529  * TTM buffer object
 530  *
 531  * @bo: Pointer to a struct ttm_buffer_object
 532  *
 533  * Returns a pointer to a struct vmw_sg_table object. The object should
 534  * not be freed after use.
 535  * Note that for the device addresses to be valid, the buffer object must
 536  * either be reserved or pinned.
 537  */
 538 const struct vmw_sg_table *vmw_bo_sg_table(struct ttm_buffer_object *bo)
 539 {
 540         struct vmw_ttm_tt *vmw_tt =
 541                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 542
 543         return &vmw_tt->vsgt;
 544 }
 545
 546
 547 static int vmw_ttm_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
 548 {
 549         struct vmw_ttm_tt *vmw_be =
 550                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 551         int ret;
 552
 553         ret = vmw_ttm_map_dma(vmw_be);
 554         if (unlikely(ret != 0))
 555                 return ret;
 556
 557         vmw_be->gmr_id = bo_mem->start;
 558         vmw_be->mem_type = bo_mem->mem_type;
 559
 560         switch (bo_mem->mem_type) {
 561         case VMW_PL_GMR:
 562                 return vmw_gmr_bind(vmw_be->dev_priv, &vmw_be->vsgt,
 563                                     ttm->num_pages, vmw_be->gmr_id);
 564         case VMW_PL_MOB:
 565                 if (unlikely(vmw_be->mob == NULL)) {
 566                         vmw_be->mob =
 567                                 vmw_mob_create(ttm->num_pages);
 568                         if (unlikely(vmw_be->mob == NULL))
 569                                 return -ENOMEM;
 570                 }
 571
 572                 return vmw_mob_bind(vmw_be->dev_priv, vmw_be->mob,
 573                                     &vmw_be->vsgt, ttm->num_pages,
 574                                     vmw_be->gmr_id);
 575         default:
 576                 BUG();
 577         }
 578         return 0;
 579 }
 580
 581 static int vmw_ttm_unbind(struct ttm_tt *ttm)
 582 {
 583         struct vmw_ttm_tt *vmw_be =
 584                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 585
 586         switch (vmw_be->mem_type) {
 587         case VMW_PL_GMR:
 588                 vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
 589                 break;
 590         case VMW_PL_MOB:
 591                 vmw_mob_unbind(vmw_be->dev_priv, vmw_be->mob);
 592                 break;
 593         default:
 594                 BUG();
 595         }
 596
 597         if (vmw_be->dev_priv->map_mode == vmw_dma_map_bind)
 598                 vmw_ttm_unmap_dma(vmw_be);
 599
 600         return 0;
 601 }
 602
 603
 604 static void vmw_ttm_destroy(struct ttm_tt *ttm)
 605 {
 606         struct vmw_ttm_tt *vmw_be =
 607                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 608
 609         vmw_ttm_unmap_dma(vmw_be);
 610         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 611                 ttm_dma_tt_fini(&vmw_be->dma_ttm);
 612         else
 613                 ttm_tt_fini(ttm);
 614
 615         if (vmw_be->mob)
 616                 vmw_mob_destroy(vmw_be->mob);
 617
 618         kfree(vmw_be);
 619 }
 620
 621
 622 static int vmw_ttm_populate(struct ttm_tt *ttm)
 623 {
 624         struct vmw_ttm_tt *vmw_tt =
 625                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 626         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 627         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 628         int ret;
 629
 630         if (ttm->state != tt_unpopulated)
 631                 return 0;
 632
 633         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 634                 size_t size =
 635                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 636                 ret = ttm_mem_global_alloc(glob, size, false, true);
 637                 if (unlikely(ret != 0))
 638                         return ret;
 639
 640                 ret = ttm_dma_populate(&vmw_tt->dma_ttm, dev_priv->dev->dev);
 641                 if (unlikely(ret != 0))
 642                         ttm_mem_global_free(glob, size);
 643         } else
 644                 ret = ttm_pool_populate(ttm);
 645
 646         return ret;
 647 }
 648
 649 static void vmw_ttm_unpopulate(struct ttm_tt *ttm)
 650 {
 651         struct vmw_ttm_tt *vmw_tt = container_of(ttm, struct vmw_ttm_tt,
 652                                                  dma_ttm.ttm);
 653         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 654         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 655
 656
 657         if (vmw_tt->mob) {
 658                 vmw_mob_destroy(vmw_tt->mob);
 659                 vmw_tt->mob = NULL;
 660         }
 661
 662         vmw_ttm_unmap_dma(vmw_tt);
 663         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 664                 size_t size =
 665                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 666
 667                 ttm_dma_unpopulate(&vmw_tt->dma_ttm, dev_priv->dev->dev);
 668                 ttm_mem_global_free(glob, size);
 669         } else
 670                 ttm_pool_unpopulate(ttm);
 671 }
 672
 673 static struct ttm_backend_func vmw_ttm_func = {
 674         .bind = vmw_ttm_bind,
 675         .unbind = vmw_ttm_unbind,
 676         .destroy = vmw_ttm_destroy,
 677 };
 678
 679 static struct ttm_tt *vmw_ttm_tt_create(struct ttm_bo_device *bdev,
 680                                  unsigned long size, uint32_t page_flags,
 681                                  struct page *dummy_read_page)
 682 {
 683         struct vmw_ttm_tt *vmw_be;
 684         int ret;
 685
 686         vmw_be = kzalloc(sizeof(*vmw_be), GFP_KERNEL);
 687         if (!vmw_be)
 688                 return NULL;
 689
 690         vmw_be->dma_ttm.ttm.func = &vmw_ttm_func;
 691         vmw_be->dev_priv = container_of(bdev, struct vmw_private, bdev);
 692         vmw_be->mob = NULL;
 693
 694         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 695                 ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bdev, size, page_flags,
 696                                       dummy_read_page);
 697         else
 698                 ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bdev, size, page_flags,
 699                                   dummy_read_page);
 700         if (unlikely(ret != 0))
 701                 goto out_no_init;
 702
 703         return &vmw_be->dma_ttm.ttm;
 704 out_no_init:
 705         kfree(vmw_be);
 706         return NULL;
 707 }
 708
 709 static int vmw_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
 710 {
 711         return 0;
 712 }
 713
 714 static int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 715                       struct ttm_mem_type_manager *man)
 716 {
 717         switch (type) {
 718         case TTM_PL_SYSTEM:
 719                 /* System memory */
 720
 721                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 722                 man->available_caching = TTM_PL_FLAG_CACHED;
 723                 man->default_caching = TTM_PL_FLAG_CACHED;
 724                 break;
 725         case TTM_PL_VRAM:
 726                 /* "On-card" video ram */
 727                 man->func = &ttm_bo_manager_func;
 728                 man->gpu_offset = 0;
 729                 man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_MAPPABLE;
 730                 man->available_caching = TTM_PL_FLAG_CACHED;
 731                 man->default_caching = TTM_PL_FLAG_CACHED;
 732                 break;
 733         case VMW_PL_GMR:
 734         case VMW_PL_MOB:
 735                 /*
 736                  * "Guest Memory Regions" is an aperture like feature with
 737                  *  one slot per bo. There is an upper limit of the number of
 738                  *  slots as well as the bo size.
 739                  */
 740                 man->func = &vmw_gmrid_manager_func;
 741                 man->gpu_offset = 0;
 742                 man->flags = TTM_MEMTYPE_FLAG_CMA | TTM_MEMTYPE_FLAG_MAPPABLE;
 743                 man->available_caching = TTM_PL_FLAG_CACHED;
 744                 man->default_caching = TTM_PL_FLAG_CACHED;
 745                 break;
 746         default:
 747                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 748                 return -EINVAL;
 749         }
 750         return 0;
 751 }
 752
 753 static void vmw_evict_flags(struct ttm_buffer_object *bo,
 754                      struct ttm_placement *placement)
 755 {
 756         *placement = vmw_sys_placement;
 757 }
 758
 759 static int vmw_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 760 {
 761         struct ttm_object_file *tfile =
 762                 vmw_fpriv((struct drm_file *)filp->private_data)->tfile;
 763
 764         return vmw_user_dmabuf_verify_access(bo, tfile);
 765 }
 766
 767 static int vmw_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 768 {
 769         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 770         struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
 771
 772         mem->bus.addr = NULL;
 773         mem->bus.is_iomem = false;
 774         mem->bus.offset = 0;
 775         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 776         mem->bus.base = 0;
 777         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 778                 return -EINVAL;
 779         switch (mem->mem_type) {
 780         case TTM_PL_SYSTEM:
 781         case VMW_PL_GMR:
 782         case VMW_PL_MOB:
 783                 return 0;
 784         case TTM_PL_VRAM:
 785                 mem->bus.offset = mem->start << PAGE_SHIFT;
 786                 mem->bus.base = dev_priv->vram_start;
 787                 mem->bus.is_iomem = true;
 788                 break;
 789         default:
 790                 return -EINVAL;
 791         }
 792         return 0;
 793 }
 794
 795 static void vmw_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 796 {
 797 }
 798
 799 static int vmw_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
 800 {
 801         return 0;
 802 }
 803
 804 /**
 805  * vmw_move_notify - TTM move_notify_callback
 806  *
 807  * @bo:             The TTM buffer object about to move.
 808  * @mem:            The truct ttm_mem_reg indicating to what memory
 809  *                  region the move is taking place.
 810  *
 811  * Calls move_notify for all subsystems needing it.
 812  * (currently only resources).
 813  */
 814 static void vmw_move_notify(struct ttm_buffer_object *bo,
 815                             struct ttm_mem_reg *mem)
 816 {
 817         vmw_resource_move_notify(bo, mem);
 818 }
 819
 820
 821 /**
 822  * vmw_swap_notify - TTM move_notify_callback
 823  *
 824  * @bo:             The TTM buffer object about to be swapped out.
 825  */
 826 static void vmw_swap_notify(struct ttm_buffer_object *bo)
 827 {
 828         ttm_bo_wait(bo, false, false, false);
 829 }
 830
 831
 832 struct ttm_bo_driver vmw_bo_driver = {
 833         .ttm_tt_create = &vmw_ttm_tt_create,
 834         .ttm_tt_populate = &vmw_ttm_populate,
 835         .ttm_tt_unpopulate = &vmw_ttm_unpopulate,
 836         .invalidate_caches = vmw_invalidate_caches,
 837         .init_mem_type = vmw_init_mem_type,
 838         .evict_flags = vmw_evict_flags,
 839         .move = NULL,
 840         .verify_access = vmw_verify_access,
 841         .move_notify = vmw_move_notify,
 842         .swap_notify = vmw_swap_notify,
 843         .fault_reserve_notify = &vmw_ttm_fault_reserve_notify,
 844         .io_mem_reserve = &vmw_ttm_io_mem_reserve,
 845         .io_mem_free = &vmw_ttm_io_mem_free,
 846 };