drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2009-2015 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 static 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 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 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 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 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 struct ttm_placement vmw_evictable_placement = {
 189         .num_placement = 4,
 190         .placement = evictable_placement_flags,
 191         .num_busy_placement = 1,
 192         .busy_placement = &sys_placement_flags
 193 };
 194
 195 struct ttm_placement vmw_srf_placement = {
 196         .num_placement = 1,
 197         .num_busy_placement = 2,
 198         .placement = &gmr_placement_flags,
 199         .busy_placement = gmr_vram_placement_flags
 200 };
 201
 202 struct ttm_placement vmw_mob_placement = {
 203         .num_placement = 1,
 204         .num_busy_placement = 1,
 205         .placement = &mob_placement_flags,
 206         .busy_placement = &mob_placement_flags
 207 };
 208
 209 struct ttm_placement vmw_mob_ne_placement = {
 210         .num_placement = 1,
 211         .num_busy_placement = 1,
 212         .placement = &mob_ne_placement_flags,
 213         .busy_placement = &mob_ne_placement_flags
 214 };
 215
 216 struct vmw_ttm_tt {
 217         struct ttm_dma_tt dma_ttm;
 218         struct vmw_private *dev_priv;
 219         int gmr_id;
 220         struct vmw_mob *mob;
 221         int mem_type;
 222         struct sg_table sgt;
 223         struct vmw_sg_table vsgt;
 224         uint64_t sg_alloc_size;
 225         bool mapped;
 226 };
 227
 228 const size_t vmw_tt_size = sizeof(struct vmw_ttm_tt);
 229
 230 /**
 231  * Helper functions to advance a struct vmw_piter iterator.
 232  *
 233  * @viter: Pointer to the iterator.
 234  *
 235  * These functions return false if past the end of the list,
 236  * true otherwise. Functions are selected depending on the current
 237  * DMA mapping mode.
 238  */
 239 static bool __vmw_piter_non_sg_next(struct vmw_piter *viter)
 240 {
 241         return ++(viter->i) < viter->num_pages;
 242 }
 243
 244 static bool __vmw_piter_sg_next(struct vmw_piter *viter)
 245 {
 246         return __sg_page_iter_next(&viter->iter);
 247 }
 248
 249
 250 /**
 251  * Helper functions to return a pointer to the current page.
 252  *
 253  * @viter: Pointer to the iterator
 254  *
 255  * These functions return a pointer to the page currently
 256  * pointed to by @viter. Functions are selected depending on the
 257  * current mapping mode.
 258  */
 259 static struct page *__vmw_piter_non_sg_page(struct vmw_piter *viter)
 260 {
 261         return viter->pages[viter->i];
 262 }
 263
 264 static struct page *__vmw_piter_sg_page(struct vmw_piter *viter)
 265 {
 266         return sg_page_iter_page(&viter->iter);
 267 }
 268
 269
 270 /**
 271  * Helper functions to return the DMA address of the current page.
 272  *
 273  * @viter: Pointer to the iterator
 274  *
 275  * These functions return the DMA address of the page currently
 276  * pointed to by @viter. Functions are selected depending on the
 277  * current mapping mode.
 278  */
 279 static dma_addr_t __vmw_piter_phys_addr(struct vmw_piter *viter)
 280 {
 281         return page_to_phys(viter->pages[viter->i]);
 282 }
 283
 284 static dma_addr_t __vmw_piter_dma_addr(struct vmw_piter *viter)
 285 {
 286         return viter->addrs[viter->i];
 287 }
 288
 289 static dma_addr_t __vmw_piter_sg_addr(struct vmw_piter *viter)
 290 {
 291         return sg_page_iter_dma_address(&viter->iter);
 292 }
 293
 294
 295 /**
 296  * vmw_piter_start - Initialize a struct vmw_piter.
 297  *
 298  * @viter: Pointer to the iterator to initialize
 299  * @vsgt: Pointer to a struct vmw_sg_table to initialize from
 300  *
 301  * Note that we're following the convention of __sg_page_iter_start, so that
 302  * the iterator doesn't point to a valid page after initialization; it has
 303  * to be advanced one step first.
 304  */
 305 void vmw_piter_start(struct vmw_piter *viter, const struct vmw_sg_table *vsgt,
 306                      unsigned long p_offset)
 307 {
 308         viter->i = p_offset - 1;
 309         viter->num_pages = vsgt->num_pages;
 310         switch (vsgt->mode) {
 311         case vmw_dma_phys:
 312                 viter->next = &__vmw_piter_non_sg_next;
 313                 viter->dma_address = &__vmw_piter_phys_addr;
 314                 viter->page = &__vmw_piter_non_sg_page;
 315                 viter->pages = vsgt->pages;
 316                 break;
 317         case vmw_dma_alloc_coherent:
 318                 viter->next = &__vmw_piter_non_sg_next;
 319                 viter->dma_address = &__vmw_piter_dma_addr;
 320                 viter->page = &__vmw_piter_non_sg_page;
 321                 viter->addrs = vsgt->addrs;
 322                 viter->pages = vsgt->pages;
 323                 break;
 324         case vmw_dma_map_populate:
 325         case vmw_dma_map_bind:
 326                 viter->next = &__vmw_piter_sg_next;
 327                 viter->dma_address = &__vmw_piter_sg_addr;
 328                 viter->page = &__vmw_piter_sg_page;
 329                 __sg_page_iter_start(&viter->iter, vsgt->sgt->sgl,
 330                                      vsgt->sgt->orig_nents, p_offset);
 331                 break;
 332         default:
 333                 BUG();
 334         }
 335 }
 336
 337 /**
 338  * vmw_ttm_unmap_from_dma - unmap  device addresses previsouly mapped for
 339  * TTM pages
 340  *
 341  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 342  *
 343  * Used to free dma mappings previously mapped by vmw_ttm_map_for_dma.
 344  */
 345 static void vmw_ttm_unmap_from_dma(struct vmw_ttm_tt *vmw_tt)
 346 {
 347         struct device *dev = vmw_tt->dev_priv->dev->dev;
 348
 349         dma_unmap_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.nents,
 350                 DMA_BIDIRECTIONAL);
 351         vmw_tt->sgt.nents = vmw_tt->sgt.orig_nents;
 352 }
 353
 354 /**
 355  * vmw_ttm_map_for_dma - map TTM pages to get device addresses
 356  *
 357  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 358  *
 359  * This function is used to get device addresses from the kernel DMA layer.
 360  * However, it's violating the DMA API in that when this operation has been
 361  * performed, it's illegal for the CPU to write to the pages without first
 362  * unmapping the DMA mappings, or calling dma_sync_sg_for_cpu(). It is
 363  * therefore only legal to call this function if we know that the function
 364  * dma_sync_sg_for_cpu() is a NOP, and dma_sync_sg_for_device() is at most
 365  * a CPU write buffer flush.
 366  */
 367 static int vmw_ttm_map_for_dma(struct vmw_ttm_tt *vmw_tt)
 368 {
 369         struct device *dev = vmw_tt->dev_priv->dev->dev;
 370         int ret;
 371
 372         ret = dma_map_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.orig_nents,
 373                          DMA_BIDIRECTIONAL);
 374         if (unlikely(ret == 0))
 375                 return -ENOMEM;
 376
 377         vmw_tt->sgt.nents = ret;
 378
 379         return 0;
 380 }
 381
 382 /**
 383  * vmw_ttm_map_dma - Make sure TTM pages are visible to the device
 384  *
 385  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 386  *
 387  * Select the correct function for and make sure the TTM pages are
 388  * visible to the device. Allocate storage for the device mappings.
 389  * If a mapping has already been performed, indicated by the storage
 390  * pointer being non NULL, the function returns success.
 391  */
 392 static int vmw_ttm_map_dma(struct vmw_ttm_tt *vmw_tt)
 393 {
 394         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 395         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 396         struct vmw_sg_table *vsgt = &vmw_tt->vsgt;
 397         struct vmw_piter iter;
 398         dma_addr_t old;
 399         int ret = 0;
 400         static size_t sgl_size;
 401         static size_t sgt_size;
 402
 403         if (vmw_tt->mapped)
 404                 return 0;
 405
 406         vsgt->mode = dev_priv->map_mode;
 407         vsgt->pages = vmw_tt->dma_ttm.ttm.pages;
 408         vsgt->num_pages = vmw_tt->dma_ttm.ttm.num_pages;
 409         vsgt->addrs = vmw_tt->dma_ttm.dma_address;
 410         vsgt->sgt = &vmw_tt->sgt;
 411
 412         switch (dev_priv->map_mode) {
 413         case vmw_dma_map_bind:
 414         case vmw_dma_map_populate:
 415                 if (unlikely(!sgl_size)) {
 416                         sgl_size = ttm_round_pot(sizeof(struct scatterlist));
 417                         sgt_size = ttm_round_pot(sizeof(struct sg_table));
 418                 }
 419                 vmw_tt->sg_alloc_size = sgt_size + sgl_size * vsgt->num_pages;
 420                 ret = ttm_mem_global_alloc(glob, vmw_tt->sg_alloc_size, false,
 421                                            true);
 422                 if (unlikely(ret != 0))
 423                         return ret;
 424
 425                 ret = sg_alloc_table_from_pages(&vmw_tt->sgt, vsgt->pages,
 426                                                 vsgt->num_pages, 0,
 427                                                 (unsigned long)
 428                                                 vsgt->num_pages << PAGE_SHIFT,
 429                                                 GFP_KERNEL);
 430                 if (unlikely(ret != 0))
 431                         goto out_sg_alloc_fail;
 432
 433                 if (vsgt->num_pages > vmw_tt->sgt.nents) {
 434                         uint64_t over_alloc =
 435                                 sgl_size * (vsgt->num_pages -
 436                                             vmw_tt->sgt.nents);
 437
 438                         ttm_mem_global_free(glob, over_alloc);
 439                         vmw_tt->sg_alloc_size -= over_alloc;
 440                 }
 441
 442                 ret = vmw_ttm_map_for_dma(vmw_tt);
 443                 if (unlikely(ret != 0))
 444                         goto out_map_fail;
 445
 446                 break;
 447         default:
 448                 break;
 449         }
 450
 451         old = ~((dma_addr_t) 0);
 452         vmw_tt->vsgt.num_regions = 0;
 453         for (vmw_piter_start(&iter, vsgt, 0); vmw_piter_next(&iter);) {
 454                 dma_addr_t cur = vmw_piter_dma_addr(&iter);
 455
 456                 if (cur != old + PAGE_SIZE)
 457                         vmw_tt->vsgt.num_regions++;
 458                 old = cur;
 459         }
 460
 461         vmw_tt->mapped = true;
 462         return 0;
 463
 464 out_map_fail:
 465         sg_free_table(vmw_tt->vsgt.sgt);
 466         vmw_tt->vsgt.sgt = NULL;
 467 out_sg_alloc_fail:
 468         ttm_mem_global_free(glob, vmw_tt->sg_alloc_size);
 469         return ret;
 470 }
 471
 472 /**
 473  * vmw_ttm_unmap_dma - Tear down any TTM page device mappings
 474  *
 475  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 476  *
 477  * Tear down any previously set up device DMA mappings and free
 478  * any storage space allocated for them. If there are no mappings set up,
 479  * this function is a NOP.
 480  */
 481 static void vmw_ttm_unmap_dma(struct vmw_ttm_tt *vmw_tt)
 482 {
 483         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 484
 485         if (!vmw_tt->vsgt.sgt)
 486                 return;
 487
 488         switch (dev_priv->map_mode) {
 489         case vmw_dma_map_bind:
 490         case vmw_dma_map_populate:
 491                 vmw_ttm_unmap_from_dma(vmw_tt);
 492                 sg_free_table(vmw_tt->vsgt.sgt);
 493                 vmw_tt->vsgt.sgt = NULL;
 494                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 495                                     vmw_tt->sg_alloc_size);
 496                 break;
 497         default:
 498                 break;
 499         }
 500         vmw_tt->mapped = false;
 501 }
 502
 503
 504 /**
 505  * vmw_bo_map_dma - Make sure buffer object pages are visible to the device
 506  *
 507  * @bo: Pointer to a struct ttm_buffer_object
 508  *
 509  * Wrapper around vmw_ttm_map_dma, that takes a TTM buffer object pointer
 510  * instead of a pointer to a struct vmw_ttm_backend as argument.
 511  * Note that the buffer object must be either pinned or reserved before
 512  * calling this function.
 513  */
 514 int vmw_bo_map_dma(struct ttm_buffer_object *bo)
 515 {
 516         struct vmw_ttm_tt *vmw_tt =
 517                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 518
 519         return vmw_ttm_map_dma(vmw_tt);
 520 }
 521
 522
 523 /**
 524  * vmw_bo_unmap_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_unmap_dma, that takes a TTM buffer object pointer
 529  * instead of a pointer to a struct vmw_ttm_backend as argument.
 530  */
 531 void vmw_bo_unmap_dma(struct ttm_buffer_object *bo)
 532 {
 533         struct vmw_ttm_tt *vmw_tt =
 534                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 535
 536         vmw_ttm_unmap_dma(vmw_tt);
 537 }
 538
 539
 540 /**
 541  * vmw_bo_sg_table - Return a struct vmw_sg_table object for a
 542  * TTM buffer object
 543  *
 544  * @bo: Pointer to a struct ttm_buffer_object
 545  *
 546  * Returns a pointer to a struct vmw_sg_table object. The object should
 547  * not be freed after use.
 548  * Note that for the device addresses to be valid, the buffer object must
 549  * either be reserved or pinned.
 550  */
 551 const struct vmw_sg_table *vmw_bo_sg_table(struct ttm_buffer_object *bo)
 552 {
 553         struct vmw_ttm_tt *vmw_tt =
 554                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 555
 556         return &vmw_tt->vsgt;
 557 }
 558
 559
 560 static int vmw_ttm_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
 561 {
 562         struct vmw_ttm_tt *vmw_be =
 563                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 564         int ret;
 565
 566         ret = vmw_ttm_map_dma(vmw_be);
 567         if (unlikely(ret != 0))
 568                 return ret;
 569
 570         vmw_be->gmr_id = bo_mem->start;
 571         vmw_be->mem_type = bo_mem->mem_type;
 572
 573         switch (bo_mem->mem_type) {
 574         case VMW_PL_GMR:
 575                 return vmw_gmr_bind(vmw_be->dev_priv, &vmw_be->vsgt,
 576                                     ttm->num_pages, vmw_be->gmr_id);
 577         case VMW_PL_MOB:
 578                 if (unlikely(vmw_be->mob == NULL)) {
 579                         vmw_be->mob =
 580                                 vmw_mob_create(ttm->num_pages);
 581                         if (unlikely(vmw_be->mob == NULL))
 582                                 return -ENOMEM;
 583                 }
 584
 585                 return vmw_mob_bind(vmw_be->dev_priv, vmw_be->mob,
 586                                     &vmw_be->vsgt, ttm->num_pages,
 587                                     vmw_be->gmr_id);
 588         default:
 589                 BUG();
 590         }
 591         return 0;
 592 }
 593
 594 static int vmw_ttm_unbind(struct ttm_tt *ttm)
 595 {
 596         struct vmw_ttm_tt *vmw_be =
 597                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 598
 599         switch (vmw_be->mem_type) {
 600         case VMW_PL_GMR:
 601                 vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
 602                 break;
 603         case VMW_PL_MOB:
 604                 vmw_mob_unbind(vmw_be->dev_priv, vmw_be->mob);
 605                 break;
 606         default:
 607                 BUG();
 608         }
 609
 610         if (vmw_be->dev_priv->map_mode == vmw_dma_map_bind)
 611                 vmw_ttm_unmap_dma(vmw_be);
 612
 613         return 0;
 614 }
 615
 616
 617 static void vmw_ttm_destroy(struct ttm_tt *ttm)
 618 {
 619         struct vmw_ttm_tt *vmw_be =
 620                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 621
 622         vmw_ttm_unmap_dma(vmw_be);
 623         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 624                 ttm_dma_tt_fini(&vmw_be->dma_ttm);
 625         else
 626                 ttm_tt_fini(ttm);
 627
 628         if (vmw_be->mob)
 629                 vmw_mob_destroy(vmw_be->mob);
 630
 631         kfree(vmw_be);
 632 }
 633
 634
 635 static int vmw_ttm_populate(struct ttm_tt *ttm)
 636 {
 637         struct vmw_ttm_tt *vmw_tt =
 638                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 639         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 640         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 641         int ret;
 642
 643         if (ttm->state != tt_unpopulated)
 644                 return 0;
 645
 646         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 647                 size_t size =
 648                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 649                 ret = ttm_mem_global_alloc(glob, size, false, true);
 650                 if (unlikely(ret != 0))
 651                         return ret;
 652
 653                 ret = ttm_dma_populate(&vmw_tt->dma_ttm, dev_priv->dev->dev);
 654                 if (unlikely(ret != 0))
 655                         ttm_mem_global_free(glob, size);
 656         } else
 657                 ret = ttm_pool_populate(ttm);
 658
 659         return ret;
 660 }
 661
 662 static void vmw_ttm_unpopulate(struct ttm_tt *ttm)
 663 {
 664         struct vmw_ttm_tt *vmw_tt = container_of(ttm, struct vmw_ttm_tt,
 665                                                  dma_ttm.ttm);
 666         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 667         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 668
 669
 670         if (vmw_tt->mob) {
 671                 vmw_mob_destroy(vmw_tt->mob);
 672                 vmw_tt->mob = NULL;
 673         }
 674
 675         vmw_ttm_unmap_dma(vmw_tt);
 676         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 677                 size_t size =
 678                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 679
 680                 ttm_dma_unpopulate(&vmw_tt->dma_ttm, dev_priv->dev->dev);
 681                 ttm_mem_global_free(glob, size);
 682         } else
 683                 ttm_pool_unpopulate(ttm);
 684 }
 685
 686 static struct ttm_backend_func vmw_ttm_func = {
 687         .bind = vmw_ttm_bind,
 688         .unbind = vmw_ttm_unbind,
 689         .destroy = vmw_ttm_destroy,
 690 };
 691
 692 static struct ttm_tt *vmw_ttm_tt_create(struct ttm_bo_device *bdev,
 693                                  unsigned long size, uint32_t page_flags,
 694                                  struct page *dummy_read_page)
 695 {
 696         struct vmw_ttm_tt *vmw_be;
 697         int ret;
 698
 699         vmw_be = kzalloc(sizeof(*vmw_be), GFP_KERNEL);
 700         if (!vmw_be)
 701                 return NULL;
 702
 703         vmw_be->dma_ttm.ttm.func = &vmw_ttm_func;
 704         vmw_be->dev_priv = container_of(bdev, struct vmw_private, bdev);
 705         vmw_be->mob = NULL;
 706
 707         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 708                 ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bdev, size, page_flags,
 709                                       dummy_read_page);
 710         else
 711                 ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bdev, size, page_flags,
 712                                   dummy_read_page);
 713         if (unlikely(ret != 0))
 714                 goto out_no_init;
 715
 716         return &vmw_be->dma_ttm.ttm;
 717 out_no_init:
 718         kfree(vmw_be);
 719         return NULL;
 720 }
 721
 722 static int vmw_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
 723 {
 724         return 0;
 725 }
 726
 727 static int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 728                       struct ttm_mem_type_manager *man)
 729 {
 730         switch (type) {
 731         case TTM_PL_SYSTEM:
 732                 /* System memory */
 733
 734                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 735                 man->available_caching = TTM_PL_FLAG_CACHED;
 736                 man->default_caching = TTM_PL_FLAG_CACHED;
 737                 break;
 738         case TTM_PL_VRAM:
 739                 /* "On-card" video ram */
 740                 man->func = &ttm_bo_manager_func;
 741                 man->gpu_offset = 0;
 742                 man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_MAPPABLE;
 743                 man->available_caching = TTM_PL_FLAG_CACHED;
 744                 man->default_caching = TTM_PL_FLAG_CACHED;
 745                 break;
 746         case VMW_PL_GMR:
 747         case VMW_PL_MOB:
 748                 /*
 749                  * "Guest Memory Regions" is an aperture like feature with
 750                  *  one slot per bo. There is an upper limit of the number of
 751                  *  slots as well as the bo size.
 752                  */
 753                 man->func = &vmw_gmrid_manager_func;
 754                 man->gpu_offset = 0;
 755                 man->flags = TTM_MEMTYPE_FLAG_CMA | TTM_MEMTYPE_FLAG_MAPPABLE;
 756                 man->available_caching = TTM_PL_FLAG_CACHED;
 757                 man->default_caching = TTM_PL_FLAG_CACHED;
 758                 break;
 759         default:
 760                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 761                 return -EINVAL;
 762         }
 763         return 0;
 764 }
 765
 766 static void vmw_evict_flags(struct ttm_buffer_object *bo,
 767                      struct ttm_placement *placement)
 768 {
 769         *placement = vmw_sys_placement;
 770 }
 771
 772 static int vmw_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 773 {
 774         struct ttm_object_file *tfile =
 775                 vmw_fpriv((struct drm_file *)filp->private_data)->tfile;
 776
 777         return vmw_user_dmabuf_verify_access(bo, tfile);
 778 }
 779
 780 static int vmw_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 781 {
 782         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 783         struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
 784
 785         mem->bus.addr = NULL;
 786         mem->bus.is_iomem = false;
 787         mem->bus.offset = 0;
 788         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 789         mem->bus.base = 0;
 790         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 791                 return -EINVAL;
 792         switch (mem->mem_type) {
 793         case TTM_PL_SYSTEM:
 794         case VMW_PL_GMR:
 795         case VMW_PL_MOB:
 796                 return 0;
 797         case TTM_PL_VRAM:
 798                 mem->bus.offset = mem->start << PAGE_SHIFT;
 799                 mem->bus.base = dev_priv->vram_start;
 800                 mem->bus.is_iomem = true;
 801                 break;
 802         default:
 803                 return -EINVAL;
 804         }
 805         return 0;
 806 }
 807
 808 static void vmw_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 809 {
 810 }
 811
 812 static int vmw_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
 813 {
 814         return 0;
 815 }
 816
 817 /**
 818  * vmw_move_notify - TTM move_notify_callback
 819  *
 820  * @bo: The TTM buffer object about to move.
 821  * @mem: The struct ttm_mem_reg indicating to what memory
 822  *       region the move is taking place.
 823  *
 824  * Calls move_notify for all subsystems needing it.
 825  * (currently only resources).
 826  */
 827 static void vmw_move_notify(struct ttm_buffer_object *bo,
 828                             struct ttm_mem_reg *mem)
 829 {
 830         vmw_resource_move_notify(bo, mem);
 831         vmw_query_move_notify(bo, mem);
 832 }
 833
 834
 835 /**
 836  * vmw_swap_notify - TTM move_notify_callback
 837  *
 838  * @bo: The TTM buffer object about to be swapped out.
 839  */
 840 static void vmw_swap_notify(struct ttm_buffer_object *bo)
 841 {
 842         ttm_bo_wait(bo, false, false);
 843 }
 844
 845
 846 struct ttm_bo_driver vmw_bo_driver = {
 847         .ttm_tt_create = &vmw_ttm_tt_create,
 848         .ttm_tt_populate = &vmw_ttm_populate,
 849         .ttm_tt_unpopulate = &vmw_ttm_unpopulate,
 850         .invalidate_caches = vmw_invalidate_caches,
 851         .init_mem_type = vmw_init_mem_type,
 852         .eviction_valuable = ttm_bo_eviction_valuable,
 853         .evict_flags = vmw_evict_flags,
 854         .move = NULL,
 855         .verify_access = vmw_verify_access,
 856         .move_notify = vmw_move_notify,
 857         .swap_notify = vmw_swap_notify,
 858         .fault_reserve_notify = &vmw_ttm_fault_reserve_notify,
 859         .io_mem_reserve = &vmw_ttm_io_mem_reserve,
 860         .io_mem_free = &vmw_ttm_io_mem_free,
 861         .lru_tail = &ttm_bo_default_lru_tail,
 862         .swap_lru_tail = &ttm_bo_default_swap_lru_tail,
 863 };