drivers/gpu/drm/vmwgfx/vmwgfx_mob.c

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /**************************************************************************
   3  *
   4  * Copyright 2012-2015 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 <linux/highmem.h>
  29
  30 #include "vmwgfx_drv.h"
  31
  32 /*
  33  * If we set up the screen target otable, screen objects stop working.
  34  */
  35
  36 #define VMW_OTABLE_SETUP_SUB ((VMWGFX_ENABLE_SCREEN_TARGET_OTABLE ? 0 : 1))
  37
  38 #ifdef CONFIG_64BIT
  39 #define VMW_PPN_SIZE 8
  40 #define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PTDEPTH64_0
  41 #define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PTDEPTH64_1
  42 #define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PTDEPTH64_2
  43 #else
  44 #define VMW_PPN_SIZE 4
  45 #define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PTDEPTH_0
  46 #define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PTDEPTH_1
  47 #define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PTDEPTH_2
  48 #endif
  49
  50 /*
  51  * struct vmw_mob - Structure containing page table and metadata for a
  52  * Guest Memory OBject.
  53  *
  54  * @num_pages       Number of pages that make up the page table.
  55  * @pt_level        The indirection level of the page table. 0-2.
  56  * @pt_root_page    DMA address of the level 0 page of the page table.
  57  */
  58 struct vmw_mob {
  59         struct ttm_buffer_object *pt_bo;
  60         unsigned long num_pages;
  61         unsigned pt_level;
  62         dma_addr_t pt_root_page;
  63         uint32_t id;
  64 };
  65
  66 /*
  67  * struct vmw_otable - Guest Memory OBject table metadata
  68  *
  69  * @size:           Size of the table (page-aligned).
  70  * @page_table:     Pointer to a struct vmw_mob holding the page table.
  71  */
  72 static const struct vmw_otable pre_dx_tables[] = {
  73         {VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE, NULL, true},
  74         {VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE, NULL, true},
  75         {VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE, NULL, true},
  76         {VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE, NULL, true},
  77         {VMWGFX_NUM_GB_SCREEN_TARGET * SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE,
  78          NULL, VMWGFX_ENABLE_SCREEN_TARGET_OTABLE}
  79 };
  80
  81 static const struct vmw_otable dx_tables[] = {
  82         {VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE, NULL, true},
  83         {VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE, NULL, true},
  84         {VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE, NULL, true},
  85         {VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE, NULL, true},
  86         {VMWGFX_NUM_GB_SCREEN_TARGET * SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE,
  87          NULL, VMWGFX_ENABLE_SCREEN_TARGET_OTABLE},
  88         {VMWGFX_NUM_DXCONTEXT * sizeof(SVGAOTableDXContextEntry), NULL, true},
  89 };
  90
  91 static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
  92                                struct vmw_mob *mob);
  93 static void vmw_mob_pt_setup(struct vmw_mob *mob,
  94                              struct vmw_piter data_iter,
  95                              unsigned long num_data_pages);
  96
  97
  98 static inline void vmw_bo_unpin_unlocked(struct ttm_buffer_object *bo)
  99 {
 100         int ret = ttm_bo_reserve(bo, false, true, NULL);
 101         BUG_ON(ret != 0);
 102         ttm_bo_unpin(bo);
 103         ttm_bo_unreserve(bo);
 104 }
 105
 106
 107 /*
 108  * vmw_setup_otable_base - Issue an object table base setup command to
 109  * the device
 110  *
 111  * @dev_priv:       Pointer to a device private structure
 112  * @type:           Type of object table base
 113  * @offset          Start of table offset into dev_priv::otable_bo
 114  * @otable          Pointer to otable metadata;
 115  *
 116  * This function returns -ENOMEM if it fails to reserve fifo space,
 117  * and may block waiting for fifo space.
 118  */
 119 static int vmw_setup_otable_base(struct vmw_private *dev_priv,
 120                                  SVGAOTableType type,
 121                                  struct ttm_buffer_object *otable_bo,
 122                                  unsigned long offset,
 123                                  struct vmw_otable *otable)
 124 {
 125         struct {
 126                 SVGA3dCmdHeader header;
 127                 SVGA3dCmdSetOTableBase64 body;
 128         } *cmd;
 129         struct vmw_mob *mob;
 130         const struct vmw_sg_table *vsgt;
 131         struct vmw_piter iter;
 132         int ret;
 133
 134         BUG_ON(otable->page_table != NULL);
 135
 136         vsgt = vmw_bo_sg_table(otable_bo);
 137         vmw_piter_start(&iter, vsgt, offset >> PAGE_SHIFT);
 138         WARN_ON(!vmw_piter_next(&iter));
 139
 140         mob = vmw_mob_create(otable->size >> PAGE_SHIFT);
 141         if (unlikely(mob == NULL)) {
 142                 DRM_ERROR("Failed creating OTable page table.\n");
 143                 return -ENOMEM;
 144         }
 145
 146         if (otable->size <= PAGE_SIZE) {
 147                 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
 148                 mob->pt_root_page = vmw_piter_dma_addr(&iter);
 149         } else if (vsgt->num_regions == 1) {
 150                 mob->pt_level = SVGA3D_MOBFMT_RANGE;
 151                 mob->pt_root_page = vmw_piter_dma_addr(&iter);
 152         } else {
 153                 ret = vmw_mob_pt_populate(dev_priv, mob);
 154                 if (unlikely(ret != 0))
 155                         goto out_no_populate;
 156
 157                 vmw_mob_pt_setup(mob, iter, otable->size >> PAGE_SHIFT);
 158                 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1;
 159         }
 160
 161         cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
 162         if (unlikely(cmd == NULL)) {
 163                 ret = -ENOMEM;
 164                 goto out_no_fifo;
 165         }
 166
 167         memset(cmd, 0, sizeof(*cmd));
 168         cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE64;
 169         cmd->header.size = sizeof(cmd->body);
 170         cmd->body.type = type;
 171         cmd->body.baseAddress = mob->pt_root_page >> PAGE_SHIFT;
 172         cmd->body.sizeInBytes = otable->size;
 173         cmd->body.validSizeInBytes = 0;
 174         cmd->body.ptDepth = mob->pt_level;
 175
 176         /*
 177          * The device doesn't support this, But the otable size is
 178          * determined at compile-time, so this BUG shouldn't trigger
 179          * randomly.
 180          */
 181         BUG_ON(mob->pt_level == VMW_MOBFMT_PTDEPTH_2);
 182
 183         vmw_cmd_commit(dev_priv, sizeof(*cmd));
 184         otable->page_table = mob;
 185
 186         return 0;
 187
 188 out_no_fifo:
 189 out_no_populate:
 190         vmw_mob_destroy(mob);
 191         return ret;
 192 }
 193
 194 /*
 195  * vmw_takedown_otable_base - Issue an object table base takedown command
 196  * to the device
 197  *
 198  * @dev_priv:       Pointer to a device private structure
 199  * @type:           Type of object table base
 200  *
 201  */
 202 static void vmw_takedown_otable_base(struct vmw_private *dev_priv,
 203                                      SVGAOTableType type,
 204                                      struct vmw_otable *otable)
 205 {
 206         struct {
 207                 SVGA3dCmdHeader header;
 208                 SVGA3dCmdSetOTableBase body;
 209         } *cmd;
 210         struct ttm_buffer_object *bo;
 211
 212         if (otable->page_table == NULL)
 213                 return;
 214
 215         bo = otable->page_table->pt_bo;
 216         cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
 217         if (unlikely(cmd == NULL))
 218                 return;
 219
 220         memset(cmd, 0, sizeof(*cmd));
 221         cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE;
 222         cmd->header.size = sizeof(cmd->body);
 223         cmd->body.type = type;
 224         cmd->body.baseAddress = 0;
 225         cmd->body.sizeInBytes = 0;
 226         cmd->body.validSizeInBytes = 0;
 227         cmd->body.ptDepth = SVGA3D_MOBFMT_INVALID;
 228         vmw_cmd_commit(dev_priv, sizeof(*cmd));
 229
 230         if (bo) {
 231                 int ret;
 232
 233                 ret = ttm_bo_reserve(bo, false, true, NULL);
 234                 BUG_ON(ret != 0);
 235
 236                 vmw_bo_fence_single(bo, NULL);
 237                 ttm_bo_unreserve(bo);
 238         }
 239
 240         vmw_mob_destroy(otable->page_table);
 241         otable->page_table = NULL;
 242 }
 243
 244
 245 static int vmw_otable_batch_setup(struct vmw_private *dev_priv,
 246                                   struct vmw_otable_batch *batch)
 247 {
 248         unsigned long offset;
 249         unsigned long bo_size;
 250         struct vmw_otable *otables = batch->otables;
 251         SVGAOTableType i;
 252         int ret;
 253
 254         bo_size = 0;
 255         for (i = 0; i < batch->num_otables; ++i) {
 256                 if (!otables[i].enabled)
 257                         continue;
 258
 259                 otables[i].size =
 260                         (otables[i].size + PAGE_SIZE - 1) & PAGE_MASK;
 261                 bo_size += otables[i].size;
 262         }
 263
 264         ret = vmw_bo_create_and_populate(dev_priv, bo_size, &batch->otable_bo);
 265         if (unlikely(ret != 0))
 266                 return ret;
 267
 268         offset = 0;
 269         for (i = 0; i < batch->num_otables; ++i) {
 270                 if (!batch->otables[i].enabled)
 271                         continue;
 272
 273                 ret = vmw_setup_otable_base(dev_priv, i, batch->otable_bo,
 274                                             offset,
 275                                             &otables[i]);
 276                 if (unlikely(ret != 0))
 277                         goto out_no_setup;
 278                 offset += otables[i].size;
 279         }
 280
 281         return 0;
 282
 283 out_no_setup:
 284         for (i = 0; i < batch->num_otables; ++i) {
 285                 if (batch->otables[i].enabled)
 286                         vmw_takedown_otable_base(dev_priv, i,
 287                                                  &batch->otables[i]);
 288         }
 289
 290         vmw_bo_unpin_unlocked(batch->otable_bo);
 291         ttm_bo_put(batch->otable_bo);
 292         batch->otable_bo = NULL;
 293         return ret;
 294 }
 295
 296 /*
 297  * vmw_otables_setup - Set up guest backed memory object tables
 298  *
 299  * @dev_priv:       Pointer to a device private structure
 300  *
 301  * Takes care of the device guest backed surface
 302  * initialization, by setting up the guest backed memory object tables.
 303  * Returns 0 on success and various error codes on failure. A successful return
 304  * means the object tables can be taken down using the vmw_otables_takedown
 305  * function.
 306  */
 307 int vmw_otables_setup(struct vmw_private *dev_priv)
 308 {
 309         struct vmw_otable **otables = &dev_priv->otable_batch.otables;
 310         int ret;
 311
 312         if (has_sm4_context(dev_priv)) {
 313                 *otables = kmemdup(dx_tables, sizeof(dx_tables), GFP_KERNEL);
 314                 if (!(*otables))
 315                         return -ENOMEM;
 316
 317                 dev_priv->otable_batch.num_otables = ARRAY_SIZE(dx_tables);
 318         } else {
 319                 *otables = kmemdup(pre_dx_tables, sizeof(pre_dx_tables),
 320                                    GFP_KERNEL);
 321                 if (!(*otables))
 322                         return -ENOMEM;
 323
 324                 dev_priv->otable_batch.num_otables = ARRAY_SIZE(pre_dx_tables);
 325         }
 326
 327         ret = vmw_otable_batch_setup(dev_priv, &dev_priv->otable_batch);
 328         if (unlikely(ret != 0))
 329                 goto out_setup;
 330
 331         return 0;
 332
 333 out_setup:
 334         kfree(*otables);
 335         return ret;
 336 }
 337
 338 static void vmw_otable_batch_takedown(struct vmw_private *dev_priv,
 339                                struct vmw_otable_batch *batch)
 340 {
 341         SVGAOTableType i;
 342         struct ttm_buffer_object *bo = batch->otable_bo;
 343         int ret;
 344
 345         for (i = 0; i < batch->num_otables; ++i)
 346                 if (batch->otables[i].enabled)
 347                         vmw_takedown_otable_base(dev_priv, i,
 348                                                  &batch->otables[i]);
 349
 350         ret = ttm_bo_reserve(bo, false, true, NULL);
 351         BUG_ON(ret != 0);
 352
 353         vmw_bo_fence_single(bo, NULL);
 354         ttm_bo_unpin(bo);
 355         ttm_bo_unreserve(bo);
 356
 357         ttm_bo_put(batch->otable_bo);
 358         batch->otable_bo = NULL;
 359 }
 360
 361 /*
 362  * vmw_otables_takedown - Take down guest backed memory object tables
 363  *
 364  * @dev_priv:       Pointer to a device private structure
 365  *
 366  * Take down the Guest Memory Object tables.
 367  */
 368 void vmw_otables_takedown(struct vmw_private *dev_priv)
 369 {
 370         vmw_otable_batch_takedown(dev_priv, &dev_priv->otable_batch);
 371         kfree(dev_priv->otable_batch.otables);
 372 }
 373
 374 /*
 375  * vmw_mob_calculate_pt_pages - Calculate the number of page table pages
 376  * needed for a guest backed memory object.
 377  *
 378  * @data_pages:  Number of data pages in the memory object buffer.
 379  */
 380 static unsigned long vmw_mob_calculate_pt_pages(unsigned long data_pages)
 381 {
 382         unsigned long data_size = data_pages * PAGE_SIZE;
 383         unsigned long tot_size = 0;
 384
 385         while (likely(data_size > PAGE_SIZE)) {
 386                 data_size = DIV_ROUND_UP(data_size, PAGE_SIZE);
 387                 data_size *= VMW_PPN_SIZE;
 388                 tot_size += (data_size + PAGE_SIZE - 1) & PAGE_MASK;
 389         }
 390
 391         return tot_size >> PAGE_SHIFT;
 392 }
 393
 394 /*
 395  * vmw_mob_create - Create a mob, but don't populate it.
 396  *
 397  * @data_pages:  Number of data pages of the underlying buffer object.
 398  */
 399 struct vmw_mob *vmw_mob_create(unsigned long data_pages)
 400 {
 401         struct vmw_mob *mob = kzalloc(sizeof(*mob), GFP_KERNEL);
 402
 403         if (unlikely(!mob))
 404                 return NULL;
 405
 406         mob->num_pages = vmw_mob_calculate_pt_pages(data_pages);
 407
 408         return mob;
 409 }
 410
 411 /*
 412  * vmw_mob_pt_populate - Populate the mob pagetable
 413  *
 414  * @mob:         Pointer to the mob the pagetable of which we want to
 415  *               populate.
 416  *
 417  * This function allocates memory to be used for the pagetable, and
 418  * adjusts TTM memory accounting accordingly. Returns ENOMEM if
 419  * memory resources aren't sufficient and may cause TTM buffer objects
 420  * to be swapped out by using the TTM memory accounting function.
 421  */
 422 static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
 423                                struct vmw_mob *mob)
 424 {
 425         BUG_ON(mob->pt_bo != NULL);
 426
 427         return vmw_bo_create_and_populate(dev_priv, mob->num_pages * PAGE_SIZE, &mob->pt_bo);
 428 }
 429
 430 /**
 431  * vmw_mob_assign_ppn - Assign a value to a page table entry
 432  *
 433  * @addr: Pointer to pointer to page table entry.
 434  * @val: The page table entry
 435  *
 436  * Assigns a value to a page table entry pointed to by *@addr and increments
 437  * *@addr according to the page table entry size.
 438  */
 439 #if (VMW_PPN_SIZE == 8)
 440 static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
 441 {
 442         *((u64 *) *addr) = val >> PAGE_SHIFT;
 443         *addr += 2;
 444 }
 445 #else
 446 static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
 447 {
 448         *(*addr)++ = val >> PAGE_SHIFT;
 449 }
 450 #endif
 451
 452 /*
 453  * vmw_mob_build_pt - Build a pagetable
 454  *
 455  * @data_addr:      Array of DMA addresses to the underlying buffer
 456  *                  object's data pages.
 457  * @num_data_pages: Number of buffer object data pages.
 458  * @pt_pages:       Array of page pointers to the page table pages.
 459  *
 460  * Returns the number of page table pages actually used.
 461  * Uses atomic kmaps of highmem pages to avoid TLB thrashing.
 462  */
 463 static unsigned long vmw_mob_build_pt(struct vmw_piter *data_iter,
 464                                       unsigned long num_data_pages,
 465                                       struct vmw_piter *pt_iter)
 466 {
 467         unsigned long pt_size = num_data_pages * VMW_PPN_SIZE;
 468         unsigned long num_pt_pages = DIV_ROUND_UP(pt_size, PAGE_SIZE);
 469         unsigned long pt_page;
 470         u32 *addr, *save_addr;
 471         unsigned long i;
 472         struct page *page;
 473
 474         for (pt_page = 0; pt_page < num_pt_pages; ++pt_page) {
 475                 page = vmw_piter_page(pt_iter);
 476
 477                 save_addr = addr = kmap_atomic(page);
 478
 479                 for (i = 0; i < PAGE_SIZE / VMW_PPN_SIZE; ++i) {
 480                         vmw_mob_assign_ppn(&addr,
 481                                            vmw_piter_dma_addr(data_iter));
 482                         if (unlikely(--num_data_pages == 0))
 483                                 break;
 484                         WARN_ON(!vmw_piter_next(data_iter));
 485                 }
 486                 kunmap_atomic(save_addr);
 487                 vmw_piter_next(pt_iter);
 488         }
 489
 490         return num_pt_pages;
 491 }
 492
 493 /*
 494  * vmw_mob_build_pt - Set up a multilevel mob pagetable
 495  *
 496  * @mob:            Pointer to a mob whose page table needs setting up.
 497  * @data_addr       Array of DMA addresses to the buffer object's data
 498  *                  pages.
 499  * @num_data_pages: Number of buffer object data pages.
 500  *
 501  * Uses tail recursion to set up a multilevel mob page table.
 502  */
 503 static void vmw_mob_pt_setup(struct vmw_mob *mob,
 504                              struct vmw_piter data_iter,
 505                              unsigned long num_data_pages)
 506 {
 507         unsigned long num_pt_pages = 0;
 508         struct ttm_buffer_object *bo = mob->pt_bo;
 509         struct vmw_piter save_pt_iter;
 510         struct vmw_piter pt_iter;
 511         const struct vmw_sg_table *vsgt;
 512         int ret;
 513
 514         ret = ttm_bo_reserve(bo, false, true, NULL);
 515         BUG_ON(ret != 0);
 516
 517         vsgt = vmw_bo_sg_table(bo);
 518         vmw_piter_start(&pt_iter, vsgt, 0);
 519         BUG_ON(!vmw_piter_next(&pt_iter));
 520         mob->pt_level = 0;
 521         while (likely(num_data_pages > 1)) {
 522                 ++mob->pt_level;
 523                 BUG_ON(mob->pt_level > 2);
 524                 save_pt_iter = pt_iter;
 525                 num_pt_pages = vmw_mob_build_pt(&data_iter, num_data_pages,
 526                                                 &pt_iter);
 527                 data_iter = save_pt_iter;
 528                 num_data_pages = num_pt_pages;
 529         }
 530
 531         mob->pt_root_page = vmw_piter_dma_addr(&save_pt_iter);
 532         ttm_bo_unreserve(bo);
 533 }
 534
 535 /*
 536  * vmw_mob_destroy - Destroy a mob, unpopulating first if necessary.
 537  *
 538  * @mob:            Pointer to a mob to destroy.
 539  */
 540 void vmw_mob_destroy(struct vmw_mob *mob)
 541 {
 542         if (mob->pt_bo) {
 543                 vmw_bo_unpin_unlocked(mob->pt_bo);
 544                 ttm_bo_put(mob->pt_bo);
 545                 mob->pt_bo = NULL;
 546         }
 547         kfree(mob);
 548 }
 549
 550 /*
 551  * vmw_mob_unbind - Hide a mob from the device.
 552  *
 553  * @dev_priv:       Pointer to a device private.
 554  * @mob_id:         Device id of the mob to unbind.
 555  */
 556 void vmw_mob_unbind(struct vmw_private *dev_priv,
 557                     struct vmw_mob *mob)
 558 {
 559         struct {
 560                 SVGA3dCmdHeader header;
 561                 SVGA3dCmdDestroyGBMob body;
 562         } *cmd;
 563         int ret;
 564         struct ttm_buffer_object *bo = mob->pt_bo;
 565
 566         if (bo) {
 567                 ret = ttm_bo_reserve(bo, false, true, NULL);
 568                 /*
 569                  * Noone else should be using this buffer.
 570                  */
 571                 BUG_ON(ret != 0);
 572         }
 573
 574         cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
 575         if (cmd) {
 576                 cmd->header.id = SVGA_3D_CMD_DESTROY_GB_MOB;
 577                 cmd->header.size = sizeof(cmd->body);
 578                 cmd->body.mobid = mob->id;
 579                 vmw_cmd_commit(dev_priv, sizeof(*cmd));
 580         }
 581
 582         if (bo) {
 583                 vmw_bo_fence_single(bo, NULL);
 584                 ttm_bo_unreserve(bo);
 585         }
 586         vmw_fifo_resource_dec(dev_priv);
 587 }
 588
 589 /*
 590  * vmw_mob_bind - Make a mob visible to the device after first
 591  *                populating it if necessary.
 592  *
 593  * @dev_priv:       Pointer to a device private.
 594  * @mob:            Pointer to the mob we're making visible.
 595  * @data_addr:      Array of DMA addresses to the data pages of the underlying
 596  *                  buffer object.
 597  * @num_data_pages: Number of data pages of the underlying buffer
 598  *                  object.
 599  * @mob_id:         Device id of the mob to bind
 600  *
 601  * This function is intended to be interfaced with the ttm_tt backend
 602  * code.
 603  */
 604 int vmw_mob_bind(struct vmw_private *dev_priv,
 605                  struct vmw_mob *mob,
 606                  const struct vmw_sg_table *vsgt,
 607                  unsigned long num_data_pages,
 608                  int32_t mob_id)
 609 {
 610         int ret;
 611         bool pt_set_up = false;
 612         struct vmw_piter data_iter;
 613         struct {
 614                 SVGA3dCmdHeader header;
 615                 SVGA3dCmdDefineGBMob64 body;
 616         } *cmd;
 617
 618         mob->id = mob_id;
 619         vmw_piter_start(&data_iter, vsgt, 0);
 620         if (unlikely(!vmw_piter_next(&data_iter)))
 621                 return 0;
 622
 623         if (likely(num_data_pages == 1)) {
 624                 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
 625                 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
 626         } else if (vsgt->num_regions == 1) {
 627                 mob->pt_level = SVGA3D_MOBFMT_RANGE;
 628                 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
 629         } else if (unlikely(mob->pt_bo == NULL)) {
 630                 ret = vmw_mob_pt_populate(dev_priv, mob);
 631                 if (unlikely(ret != 0))
 632                         return ret;
 633
 634                 vmw_mob_pt_setup(mob, data_iter, num_data_pages);
 635                 pt_set_up = true;
 636                 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1;
 637         }
 638
 639         vmw_fifo_resource_inc(dev_priv);
 640
 641         cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
 642         if (unlikely(cmd == NULL))
 643                 goto out_no_cmd_space;
 644
 645         cmd->header.id = SVGA_3D_CMD_DEFINE_GB_MOB64;
 646         cmd->header.size = sizeof(cmd->body);
 647         cmd->body.mobid = mob_id;
 648         cmd->body.ptDepth = mob->pt_level;
 649         cmd->body.base = mob->pt_root_page >> PAGE_SHIFT;
 650         cmd->body.sizeInBytes = num_data_pages * PAGE_SIZE;
 651
 652         vmw_cmd_commit(dev_priv, sizeof(*cmd));
 653
 654         return 0;
 655
 656 out_no_cmd_space:
 657         vmw_fifo_resource_dec(dev_priv);
 658         if (pt_set_up) {
 659                 vmw_bo_unpin_unlocked(mob->pt_bo);
 660                 ttm_bo_put(mob->pt_bo);
 661                 mob->pt_bo = NULL;
 662         }
 663
 664         return -ENOMEM;
 665 }