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         /*
 315          * FIXME: This driver wrongly mixes DMA and CPU SG list iteration and
 316          * needs revision. See
 317          * https://lore.kernel.org/lkml/20190104223531.GA1705@ziepe.ca/
 318          */
 319         return sg_page_iter_dma_address(
 320                 container_of(&viter->iter, struct sg_dma_page_iter, base));
 321 }
 322
 323
 324 /**
 325  * vmw_piter_start - Initialize a struct vmw_piter.
 326  *
 327  * @viter: Pointer to the iterator to initialize
 328  * @vsgt: Pointer to a struct vmw_sg_table to initialize from
 329  *
 330  * Note that we're following the convention of __sg_page_iter_start, so that
 331  * the iterator doesn't point to a valid page after initialization; it has
 332  * to be advanced one step first.
 333  */
 334 void vmw_piter_start(struct vmw_piter *viter, const struct vmw_sg_table *vsgt,
 335                      unsigned long p_offset)
 336 {
 337         viter->i = p_offset - 1;
 338         viter->num_pages = vsgt->num_pages;
 339         switch (vsgt->mode) {
 340         case vmw_dma_phys:
 341                 viter->next = &__vmw_piter_non_sg_next;
 342                 viter->dma_address = &__vmw_piter_phys_addr;
 343                 viter->page = &__vmw_piter_non_sg_page;
 344                 viter->pages = vsgt->pages;
 345                 break;
 346         case vmw_dma_alloc_coherent:
 347                 viter->next = &__vmw_piter_non_sg_next;
 348                 viter->dma_address = &__vmw_piter_dma_addr;
 349                 viter->page = &__vmw_piter_non_sg_page;
 350                 viter->addrs = vsgt->addrs;
 351                 viter->pages = vsgt->pages;
 352                 break;
 353         case vmw_dma_map_populate:
 354         case vmw_dma_map_bind:
 355                 viter->next = &__vmw_piter_sg_next;
 356                 viter->dma_address = &__vmw_piter_sg_addr;
 357                 viter->page = &__vmw_piter_sg_page;
 358                 __sg_page_iter_start(&viter->iter, vsgt->sgt->sgl,
 359                                      vsgt->sgt->orig_nents, p_offset);
 360                 break;
 361         default:
 362                 BUG();
 363         }
 364 }
 365
 366 /**
 367  * vmw_ttm_unmap_from_dma - unmap  device addresses previsouly mapped for
 368  * TTM pages
 369  *
 370  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 371  *
 372  * Used to free dma mappings previously mapped by vmw_ttm_map_for_dma.
 373  */
 374 static void vmw_ttm_unmap_from_dma(struct vmw_ttm_tt *vmw_tt)
 375 {
 376         struct device *dev = vmw_tt->dev_priv->dev->dev;
 377
 378         dma_unmap_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.nents,
 379                 DMA_BIDIRECTIONAL);
 380         vmw_tt->sgt.nents = vmw_tt->sgt.orig_nents;
 381 }
 382
 383 /**
 384  * vmw_ttm_map_for_dma - map TTM pages to get device addresses
 385  *
 386  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 387  *
 388  * This function is used to get device addresses from the kernel DMA layer.
 389  * However, it's violating the DMA API in that when this operation has been
 390  * performed, it's illegal for the CPU to write to the pages without first
 391  * unmapping the DMA mappings, or calling dma_sync_sg_for_cpu(). It is
 392  * therefore only legal to call this function if we know that the function
 393  * dma_sync_sg_for_cpu() is a NOP, and dma_sync_sg_for_device() is at most
 394  * a CPU write buffer flush.
 395  */
 396 static int vmw_ttm_map_for_dma(struct vmw_ttm_tt *vmw_tt)
 397 {
 398         struct device *dev = vmw_tt->dev_priv->dev->dev;
 399         int ret;
 400
 401         ret = dma_map_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.orig_nents,
 402                          DMA_BIDIRECTIONAL);
 403         if (unlikely(ret == 0))
 404                 return -ENOMEM;
 405
 406         vmw_tt->sgt.nents = ret;
 407
 408         return 0;
 409 }
 410
 411 /**
 412  * vmw_ttm_map_dma - Make sure TTM pages are visible to the device
 413  *
 414  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 415  *
 416  * Select the correct function for and make sure the TTM pages are
 417  * visible to the device. Allocate storage for the device mappings.
 418  * If a mapping has already been performed, indicated by the storage
 419  * pointer being non NULL, the function returns success.
 420  */
 421 static int vmw_ttm_map_dma(struct vmw_ttm_tt *vmw_tt)
 422 {
 423         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 424         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 425         struct vmw_sg_table *vsgt = &vmw_tt->vsgt;
 426         struct ttm_operation_ctx ctx = {
 427                 .interruptible = true,
 428                 .no_wait_gpu = false
 429         };
 430         struct vmw_piter iter;
 431         dma_addr_t old;
 432         int ret = 0;
 433         static size_t sgl_size;
 434         static size_t sgt_size;
 435
 436         if (vmw_tt->mapped)
 437                 return 0;
 438
 439         vsgt->mode = dev_priv->map_mode;
 440         vsgt->pages = vmw_tt->dma_ttm.ttm.pages;
 441         vsgt->num_pages = vmw_tt->dma_ttm.ttm.num_pages;
 442         vsgt->addrs = vmw_tt->dma_ttm.dma_address;
 443         vsgt->sgt = &vmw_tt->sgt;
 444
 445         switch (dev_priv->map_mode) {
 446         case vmw_dma_map_bind:
 447         case vmw_dma_map_populate:
 448                 if (unlikely(!sgl_size)) {
 449                         sgl_size = ttm_round_pot(sizeof(struct scatterlist));
 450                         sgt_size = ttm_round_pot(sizeof(struct sg_table));
 451                 }
 452                 vmw_tt->sg_alloc_size = sgt_size + sgl_size * vsgt->num_pages;
 453                 ret = ttm_mem_global_alloc(glob, vmw_tt->sg_alloc_size, &ctx);
 454                 if (unlikely(ret != 0))
 455                         return ret;
 456
 457                 ret = sg_alloc_table_from_pages(&vmw_tt->sgt, vsgt->pages,
 458                                                 vsgt->num_pages, 0,
 459                                                 (unsigned long)
 460                                                 vsgt->num_pages << PAGE_SHIFT,
 461                                                 GFP_KERNEL);
 462                 if (unlikely(ret != 0))
 463                         goto out_sg_alloc_fail;
 464
 465                 if (vsgt->num_pages > vmw_tt->sgt.nents) {
 466                         uint64_t over_alloc =
 467                                 sgl_size * (vsgt->num_pages -
 468                                             vmw_tt->sgt.nents);
 469
 470                         ttm_mem_global_free(glob, over_alloc);
 471                         vmw_tt->sg_alloc_size -= over_alloc;
 472                 }
 473
 474                 ret = vmw_ttm_map_for_dma(vmw_tt);
 475                 if (unlikely(ret != 0))
 476                         goto out_map_fail;
 477
 478                 break;
 479         default:
 480                 break;
 481         }
 482
 483         old = ~((dma_addr_t) 0);
 484         vmw_tt->vsgt.num_regions = 0;
 485         for (vmw_piter_start(&iter, vsgt, 0); vmw_piter_next(&iter);) {
 486                 dma_addr_t cur = vmw_piter_dma_addr(&iter);
 487
 488                 if (cur != old + PAGE_SIZE)
 489                         vmw_tt->vsgt.num_regions++;
 490                 old = cur;
 491         }
 492
 493         vmw_tt->mapped = true;
 494         return 0;
 495
 496 out_map_fail:
 497         sg_free_table(vmw_tt->vsgt.sgt);
 498         vmw_tt->vsgt.sgt = NULL;
 499 out_sg_alloc_fail:
 500         ttm_mem_global_free(glob, vmw_tt->sg_alloc_size);
 501         return ret;
 502 }
 503
 504 /**
 505  * vmw_ttm_unmap_dma - Tear down any TTM page device mappings
 506  *
 507  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 508  *
 509  * Tear down any previously set up device DMA mappings and free
 510  * any storage space allocated for them. If there are no mappings set up,
 511  * this function is a NOP.
 512  */
 513 static void vmw_ttm_unmap_dma(struct vmw_ttm_tt *vmw_tt)
 514 {
 515         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 516
 517         if (!vmw_tt->vsgt.sgt)
 518                 return;
 519
 520         switch (dev_priv->map_mode) {
 521         case vmw_dma_map_bind:
 522         case vmw_dma_map_populate:
 523                 vmw_ttm_unmap_from_dma(vmw_tt);
 524                 sg_free_table(vmw_tt->vsgt.sgt);
 525                 vmw_tt->vsgt.sgt = NULL;
 526                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 527                                     vmw_tt->sg_alloc_size);
 528                 break;
 529         default:
 530                 break;
 531         }
 532         vmw_tt->mapped = false;
 533 }
 534
 535
 536 /**
 537  * vmw_bo_map_dma - Make sure buffer object pages are visible to the device
 538  *
 539  * @bo: Pointer to a struct ttm_buffer_object
 540  *
 541  * Wrapper around vmw_ttm_map_dma, that takes a TTM buffer object pointer
 542  * instead of a pointer to a struct vmw_ttm_backend as argument.
 543  * Note that the buffer object must be either pinned or reserved before
 544  * calling this function.
 545  */
 546 int vmw_bo_map_dma(struct ttm_buffer_object *bo)
 547 {
 548         struct vmw_ttm_tt *vmw_tt =
 549                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 550
 551         return vmw_ttm_map_dma(vmw_tt);
 552 }
 553
 554
 555 /**
 556  * vmw_bo_unmap_dma - Make sure buffer object pages are visible to the device
 557  *
 558  * @bo: Pointer to a struct ttm_buffer_object
 559  *
 560  * Wrapper around vmw_ttm_unmap_dma, that takes a TTM buffer object pointer
 561  * instead of a pointer to a struct vmw_ttm_backend as argument.
 562  */
 563 void vmw_bo_unmap_dma(struct ttm_buffer_object *bo)
 564 {
 565         struct vmw_ttm_tt *vmw_tt =
 566                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 567
 568         vmw_ttm_unmap_dma(vmw_tt);
 569 }
 570
 571
 572 /**
 573  * vmw_bo_sg_table - Return a struct vmw_sg_table object for a
 574  * TTM buffer object
 575  *
 576  * @bo: Pointer to a struct ttm_buffer_object
 577  *
 578  * Returns a pointer to a struct vmw_sg_table object. The object should
 579  * not be freed after use.
 580  * Note that for the device addresses to be valid, the buffer object must
 581  * either be reserved or pinned.
 582  */
 583 const struct vmw_sg_table *vmw_bo_sg_table(struct ttm_buffer_object *bo)
 584 {
 585         struct vmw_ttm_tt *vmw_tt =
 586                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 587
 588         return &vmw_tt->vsgt;
 589 }
 590
 591
 592 static int vmw_ttm_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
 593 {
 594         struct vmw_ttm_tt *vmw_be =
 595                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 596         int ret;
 597
 598         ret = vmw_ttm_map_dma(vmw_be);
 599         if (unlikely(ret != 0))
 600                 return ret;
 601
 602         vmw_be->gmr_id = bo_mem->start;
 603         vmw_be->mem_type = bo_mem->mem_type;
 604
 605         switch (bo_mem->mem_type) {
 606         case VMW_PL_GMR:
 607                 return vmw_gmr_bind(vmw_be->dev_priv, &vmw_be->vsgt,
 608                                     ttm->num_pages, vmw_be->gmr_id);
 609         case VMW_PL_MOB:
 610                 if (unlikely(vmw_be->mob == NULL)) {
 611                         vmw_be->mob =
 612                                 vmw_mob_create(ttm->num_pages);
 613                         if (unlikely(vmw_be->mob == NULL))
 614                                 return -ENOMEM;
 615                 }
 616
 617                 return vmw_mob_bind(vmw_be->dev_priv, vmw_be->mob,
 618                                     &vmw_be->vsgt, ttm->num_pages,
 619                                     vmw_be->gmr_id);
 620         default:
 621                 BUG();
 622         }
 623         return 0;
 624 }
 625
 626 static int vmw_ttm_unbind(struct ttm_tt *ttm)
 627 {
 628         struct vmw_ttm_tt *vmw_be =
 629                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 630
 631         switch (vmw_be->mem_type) {
 632         case VMW_PL_GMR:
 633                 vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
 634                 break;
 635         case VMW_PL_MOB:
 636                 vmw_mob_unbind(vmw_be->dev_priv, vmw_be->mob);
 637                 break;
 638         default:
 639                 BUG();
 640         }
 641
 642         if (vmw_be->dev_priv->map_mode == vmw_dma_map_bind)
 643                 vmw_ttm_unmap_dma(vmw_be);
 644
 645         return 0;
 646 }
 647
 648
 649 static void vmw_ttm_destroy(struct ttm_tt *ttm)
 650 {
 651         struct vmw_ttm_tt *vmw_be =
 652                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 653
 654         vmw_ttm_unmap_dma(vmw_be);
 655         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 656                 ttm_dma_tt_fini(&vmw_be->dma_ttm);
 657         else
 658                 ttm_tt_fini(ttm);
 659
 660         if (vmw_be->mob)
 661                 vmw_mob_destroy(vmw_be->mob);
 662
 663         kfree(vmw_be);
 664 }
 665
 666
 667 static int vmw_ttm_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
 668 {
 669         struct vmw_ttm_tt *vmw_tt =
 670                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 671         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 672         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 673         int ret;
 674
 675         if (ttm->state != tt_unpopulated)
 676                 return 0;
 677
 678         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 679                 size_t size =
 680                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 681                 ret = ttm_mem_global_alloc(glob, size, ctx);
 682                 if (unlikely(ret != 0))
 683                         return ret;
 684
 685                 ret = ttm_dma_populate(&vmw_tt->dma_ttm, dev_priv->dev->dev,
 686                                         ctx);
 687                 if (unlikely(ret != 0))
 688                         ttm_mem_global_free(glob, size);
 689         } else
 690                 ret = ttm_pool_populate(ttm, ctx);
 691
 692         return ret;
 693 }
 694
 695 static void vmw_ttm_unpopulate(struct ttm_tt *ttm)
 696 {
 697         struct vmw_ttm_tt *vmw_tt = container_of(ttm, struct vmw_ttm_tt,
 698                                                  dma_ttm.ttm);
 699         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 700         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 701
 702
 703         if (vmw_tt->mob) {
 704                 vmw_mob_destroy(vmw_tt->mob);
 705                 vmw_tt->mob = NULL;
 706         }
 707
 708         vmw_ttm_unmap_dma(vmw_tt);
 709         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 710                 size_t size =
 711                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 712
 713                 ttm_dma_unpopulate(&vmw_tt->dma_ttm, dev_priv->dev->dev);
 714                 ttm_mem_global_free(glob, size);
 715         } else
 716                 ttm_pool_unpopulate(ttm);
 717 }
 718
 719 static struct ttm_backend_func vmw_ttm_func = {
 720         .bind = vmw_ttm_bind,
 721         .unbind = vmw_ttm_unbind,
 722         .destroy = vmw_ttm_destroy,
 723 };
 724
 725 static struct ttm_tt *vmw_ttm_tt_create(struct ttm_buffer_object *bo,
 726                                         uint32_t page_flags)
 727 {
 728         struct vmw_ttm_tt *vmw_be;
 729         int ret;
 730
 731         vmw_be = kzalloc(sizeof(*vmw_be), GFP_KERNEL);
 732         if (!vmw_be)
 733                 return NULL;
 734
 735         vmw_be->dma_ttm.ttm.func = &vmw_ttm_func;
 736         vmw_be->dev_priv = container_of(bo->bdev, struct vmw_private, bdev);
 737         vmw_be->mob = NULL;
 738
 739         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 740                 ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bo, page_flags);
 741         else
 742                 ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bo, page_flags);
 743         if (unlikely(ret != 0))
 744                 goto out_no_init;
 745
 746         return &vmw_be->dma_ttm.ttm;
 747 out_no_init:
 748         kfree(vmw_be);
 749         return NULL;
 750 }
 751
 752 static int vmw_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
 753 {
 754         return 0;
 755 }
 756
 757 static int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 758                       struct ttm_mem_type_manager *man)
 759 {
 760         switch (type) {
 761         case TTM_PL_SYSTEM:
 762                 /* System memory */
 763
 764                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 765                 man->available_caching = TTM_PL_FLAG_CACHED;
 766                 man->default_caching = TTM_PL_FLAG_CACHED;
 767                 break;
 768         case TTM_PL_VRAM:
 769                 /* "On-card" video ram */
 770                 man->func = &ttm_bo_manager_func;
 771                 man->gpu_offset = 0;
 772                 man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_MAPPABLE;
 773                 man->available_caching = TTM_PL_FLAG_CACHED;
 774                 man->default_caching = TTM_PL_FLAG_CACHED;
 775                 break;
 776         case VMW_PL_GMR:
 777         case VMW_PL_MOB:
 778                 /*
 779                  * "Guest Memory Regions" is an aperture like feature with
 780                  *  one slot per bo. There is an upper limit of the number of
 781                  *  slots as well as the bo size.
 782                  */
 783                 man->func = &vmw_gmrid_manager_func;
 784                 man->gpu_offset = 0;
 785                 man->flags = TTM_MEMTYPE_FLAG_CMA | TTM_MEMTYPE_FLAG_MAPPABLE;
 786                 man->available_caching = TTM_PL_FLAG_CACHED;
 787                 man->default_caching = TTM_PL_FLAG_CACHED;
 788                 break;
 789         default:
 790                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 791                 return -EINVAL;
 792         }
 793         return 0;
 794 }
 795
 796 static void vmw_evict_flags(struct ttm_buffer_object *bo,
 797                      struct ttm_placement *placement)
 798 {
 799         *placement = vmw_sys_placement;
 800 }
 801
 802 static int vmw_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 803 {
 804         struct ttm_object_file *tfile =
 805                 vmw_fpriv((struct drm_file *)filp->private_data)->tfile;
 806
 807         return vmw_user_bo_verify_access(bo, tfile);
 808 }
 809
 810 static int vmw_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 811 {
 812         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 813         struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
 814
 815         mem->bus.addr = NULL;
 816         mem->bus.is_iomem = false;
 817         mem->bus.offset = 0;
 818         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 819         mem->bus.base = 0;
 820         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 821                 return -EINVAL;
 822         switch (mem->mem_type) {
 823         case TTM_PL_SYSTEM:
 824         case VMW_PL_GMR:
 825         case VMW_PL_MOB:
 826                 return 0;
 827         case TTM_PL_VRAM:
 828                 mem->bus.offset = mem->start << PAGE_SHIFT;
 829                 mem->bus.base = dev_priv->vram_start;
 830                 mem->bus.is_iomem = true;
 831                 break;
 832         default:
 833                 return -EINVAL;
 834         }
 835         return 0;
 836 }
 837
 838 static void vmw_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 839 {
 840 }
 841
 842 static int vmw_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
 843 {
 844         return 0;
 845 }
 846
 847 /**
 848  * vmw_move_notify - TTM move_notify_callback
 849  *
 850  * @bo: The TTM buffer object about to move.
 851  * @mem: The struct ttm_mem_reg indicating to what memory
 852  *       region the move is taking place.
 853  *
 854  * Calls move_notify for all subsystems needing it.
 855  * (currently only resources).
 856  */
 857 static void vmw_move_notify(struct ttm_buffer_object *bo,
 858                             bool evict,
 859                             struct ttm_mem_reg *mem)
 860 {
 861         vmw_bo_move_notify(bo, mem);
 862         vmw_query_move_notify(bo, mem);
 863 }
 864
 865
 866 /**
 867  * vmw_swap_notify - TTM move_notify_callback
 868  *
 869  * @bo: The TTM buffer object about to be swapped out.
 870  */
 871 static void vmw_swap_notify(struct ttm_buffer_object *bo)
 872 {
 873         vmw_bo_swap_notify(bo);
 874         (void) ttm_bo_wait(bo, false, false);
 875 }
 876
 877
 878 struct ttm_bo_driver vmw_bo_driver = {
 879         .ttm_tt_create = &vmw_ttm_tt_create,
 880         .ttm_tt_populate = &vmw_ttm_populate,
 881         .ttm_tt_unpopulate = &vmw_ttm_unpopulate,
 882         .invalidate_caches = vmw_invalidate_caches,
 883         .init_mem_type = vmw_init_mem_type,
 884         .eviction_valuable = ttm_bo_eviction_valuable,
 885         .evict_flags = vmw_evict_flags,
 886         .move = NULL,
 887         .verify_access = vmw_verify_access,
 888         .move_notify = vmw_move_notify,
 889         .swap_notify = vmw_swap_notify,
 890         .fault_reserve_notify = &vmw_ttm_fault_reserve_notify,
 891         .io_mem_reserve = &vmw_ttm_io_mem_reserve,
 892         .io_mem_free = &vmw_ttm_io_mem_free,
 893 };