drivers/gpu/drm/vmwgfx/vmwgfx_mob.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2012 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
  30 /*
  31  * If we set up the screen target otable, screen objects stop working.
  32  */
  33
  34 #define VMW_OTABLE_SETUP_SUB ((VMWGFX_ENABLE_SCREEN_TARGET_OTABLE) ? 0 : 1)
  35
  36 /*
  37  * Currently the MOB interface does not support 64-bit page frame numbers.
  38  * This might change in the future to be similar to the GMR2 interface
  39  * when virtual machines support memory beyond 16TB.
  40  */
  41
  42 #define VMW_PPN_SIZE 4
  43
  44 /*
  45  * struct vmw_mob - Structure containing page table and metadata for a
  46  * Guest Memory OBject.
  47  *
  48  * @num_pages       Number of pages that make up the page table.
  49  * @pt_level        The indirection level of the page table. 0-2.
  50  * @pt_root_page    DMA address of the level 0 page of the page table.
  51  */
  52 struct vmw_mob {
  53         struct ttm_buffer_object *pt_bo;
  54         unsigned long num_pages;
  55         unsigned pt_level;
  56         dma_addr_t pt_root_page;
  57         uint32_t id;
  58 };
  59
  60 /*
  61  * struct vmw_otable - Guest Memory OBject table metadata
  62  *
  63  * @size:           Size of the table (page-aligned).
  64  * @page_table:     Pointer to a struct vmw_mob holding the page table.
  65  */
  66 struct vmw_otable {
  67         unsigned long size;
  68         struct vmw_mob *page_table;
  69 };
  70
  71 static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
  72                                struct vmw_mob *mob);
  73 static void vmw_mob_pt_setup(struct vmw_mob *mob,
  74                              struct vmw_piter data_iter,
  75                              unsigned long num_data_pages);
  76
  77 /*
  78  * vmw_setup_otable_base - Issue an object table base setup command to
  79  * the device
  80  *
  81  * @dev_priv:       Pointer to a device private structure
  82  * @type:           Type of object table base
  83  * @offset          Start of table offset into dev_priv::otable_bo
  84  * @otable          Pointer to otable metadata;
  85  *
  86  * This function returns -ENOMEM if it fails to reserve fifo space,
  87  * and may block waiting for fifo space.
  88  */
  89 static int vmw_setup_otable_base(struct vmw_private *dev_priv,
  90                                  SVGAOTableType type,
  91                                  unsigned long offset,
  92                                  struct vmw_otable *otable)
  93 {
  94         struct {
  95                 SVGA3dCmdHeader header;
  96                 SVGA3dCmdSetOTableBase body;
  97         } *cmd;
  98         struct vmw_mob *mob;
  99         const struct vmw_sg_table *vsgt;
 100         struct vmw_piter iter;
 101         int ret;
 102
 103         BUG_ON(otable->page_table != NULL);
 104
 105         vsgt = vmw_bo_sg_table(dev_priv->otable_bo);
 106         vmw_piter_start(&iter, vsgt, offset >> PAGE_SHIFT);
 107         WARN_ON(!vmw_piter_next(&iter));
 108
 109         mob = vmw_mob_create(otable->size >> PAGE_SHIFT);
 110         if (unlikely(mob == NULL)) {
 111                 DRM_ERROR("Failed creating OTable page table.\n");
 112                 return -ENOMEM;
 113         }
 114
 115         if (otable->size <= PAGE_SIZE) {
 116                 mob->pt_level = SVGA3D_MOBFMT_PTDEPTH_0;
 117                 mob->pt_root_page = vmw_piter_dma_addr(&iter);
 118         } else if (vsgt->num_regions == 1) {
 119                 mob->pt_level = SVGA3D_MOBFMT_RANGE;
 120                 mob->pt_root_page = vmw_piter_dma_addr(&iter);
 121         } else {
 122                 ret = vmw_mob_pt_populate(dev_priv, mob);
 123                 if (unlikely(ret != 0))
 124                         goto out_no_populate;
 125
 126                 vmw_mob_pt_setup(mob, iter, otable->size >> PAGE_SHIFT);
 127         }
 128
 129         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 130         if (unlikely(cmd == NULL)) {
 131                 DRM_ERROR("Failed reserving FIFO space for OTable setup.\n");
 132                 goto out_no_fifo;
 133         }
 134
 135         memset(cmd, 0, sizeof(*cmd));
 136         cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE;
 137         cmd->header.size = sizeof(cmd->body);
 138         cmd->body.type = type;
 139         cmd->body.baseAddress = mob->pt_root_page >> PAGE_SHIFT;
 140         cmd->body.sizeInBytes = otable->size;
 141         cmd->body.validSizeInBytes = 0;
 142         cmd->body.ptDepth = mob->pt_level;
 143
 144         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 145         otable->page_table = mob;
 146
 147         return 0;
 148
 149 out_no_fifo:
 150 out_no_populate:
 151         vmw_mob_destroy(mob);
 152         return ret;
 153 }
 154
 155 /*
 156  * vmw_takedown_otable_base - Issue an object table base takedown command
 157  * to the device
 158  *
 159  * @dev_priv:       Pointer to a device private structure
 160  * @type:           Type of object table base
 161  *
 162  */
 163 static void vmw_takedown_otable_base(struct vmw_private *dev_priv,
 164                                      SVGAOTableType type,
 165                                      struct vmw_otable *otable)
 166 {
 167         struct {
 168                 SVGA3dCmdHeader header;
 169                 SVGA3dCmdSetOTableBase body;
 170         } *cmd;
 171         struct ttm_buffer_object *bo = otable->page_table->pt_bo;
 172
 173         if (otable->page_table == NULL)
 174                 return;
 175
 176         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 177         if (unlikely(cmd == NULL))
 178                 DRM_ERROR("Failed reserving FIFO space for OTable setup.\n");
 179
 180         memset(cmd, 0, sizeof(*cmd));
 181         cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE;
 182         cmd->header.size = sizeof(cmd->body);
 183         cmd->body.type = type;
 184         cmd->body.baseAddress = 0;
 185         cmd->body.sizeInBytes = 0;
 186         cmd->body.validSizeInBytes = 0;
 187         cmd->body.ptDepth = SVGA3D_MOBFMT_INVALID;
 188         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 189
 190         if (bo) {
 191                 int ret;
 192
 193                 ret = ttm_bo_reserve(bo, false, true, false, false);
 194                 BUG_ON(ret != 0);
 195
 196                 vmw_fence_single_bo(bo, NULL);
 197                 ttm_bo_unreserve(bo);
 198         }
 199
 200         vmw_mob_destroy(otable->page_table);
 201         otable->page_table = NULL;
 202 }
 203
 204 /*
 205  * vmw_otables_setup - Set up guest backed memory object tables
 206  *
 207  * @dev_priv:       Pointer to a device private structure
 208  *
 209  * Takes care of the device guest backed surface
 210  * initialization, by setting up the guest backed memory object tables.
 211  * Returns 0 on success and various error codes on failure. A succesful return
 212  * means the object tables can be taken down using the vmw_otables_takedown
 213  * function.
 214  */
 215 int vmw_otables_setup(struct vmw_private *dev_priv)
 216 {
 217         unsigned long offset;
 218         unsigned long bo_size;
 219         struct vmw_otable *otables;
 220         SVGAOTableType i;
 221         int ret;
 222
 223         otables = kzalloc(SVGA_OTABLE_DX9_MAX * sizeof(*otables),
 224                           GFP_KERNEL);
 225         if (unlikely(otables == NULL)) {
 226                 DRM_ERROR("Failed to allocate space for otable "
 227                           "metadata.\n");
 228                 return -ENOMEM;
 229         }
 230
 231         otables[SVGA_OTABLE_MOB].size =
 232                 VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE;
 233         otables[SVGA_OTABLE_SURFACE].size =
 234                 VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE;
 235         otables[SVGA_OTABLE_CONTEXT].size =
 236                 VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE;
 237         otables[SVGA_OTABLE_SHADER].size =
 238                 VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE;
 239         otables[SVGA_OTABLE_SCREEN_TARGET].size =
 240                 VMWGFX_NUM_GB_SCREEN_TARGET *
 241                 SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE;
 242
 243         bo_size = 0;
 244         for (i = 0; i < SVGA_OTABLE_DX9_MAX; ++i) {
 245                 otables[i].size =
 246                         (otables[i].size + PAGE_SIZE - 1) & PAGE_MASK;
 247                 bo_size += otables[i].size;
 248         }
 249
 250         ret = ttm_bo_create(&dev_priv->bdev, bo_size,
 251                             ttm_bo_type_device,
 252                             &vmw_sys_ne_placement,
 253                             0, false, NULL,
 254                             &dev_priv->otable_bo);
 255
 256         if (unlikely(ret != 0))
 257                 goto out_no_bo;
 258
 259         ret = ttm_bo_reserve(dev_priv->otable_bo, false, true, false, false);
 260         BUG_ON(ret != 0);
 261         ret = vmw_bo_driver.ttm_tt_populate(dev_priv->otable_bo->ttm);
 262         if (unlikely(ret != 0))
 263                 goto out_unreserve;
 264         ret = vmw_bo_map_dma(dev_priv->otable_bo);
 265         if (unlikely(ret != 0))
 266                 goto out_unreserve;
 267
 268         ttm_bo_unreserve(dev_priv->otable_bo);
 269
 270         offset = 0;
 271         for (i = 0; i < SVGA_OTABLE_DX9_MAX - VMW_OTABLE_SETUP_SUB; ++i) {
 272                 ret = vmw_setup_otable_base(dev_priv, i, offset,
 273                                             &otables[i]);
 274                 if (unlikely(ret != 0))
 275                         goto out_no_setup;
 276                 offset += otables[i].size;
 277         }
 278
 279         dev_priv->otables = otables;
 280         return 0;
 281
 282 out_unreserve:
 283         ttm_bo_unreserve(dev_priv->otable_bo);
 284 out_no_setup:
 285         for (i = 0; i < SVGA_OTABLE_DX9_MAX - VMW_OTABLE_SETUP_SUB; ++i)
 286                 vmw_takedown_otable_base(dev_priv, i, &otables[i]);
 287
 288         ttm_bo_unref(&dev_priv->otable_bo);
 289 out_no_bo:
 290         kfree(otables);
 291         return ret;
 292 }
 293
 294
 295 /*
 296  * vmw_otables_takedown - Take down guest backed memory object tables
 297  *
 298  * @dev_priv:       Pointer to a device private structure
 299  *
 300  * Take down the Guest Memory Object tables.
 301  */
 302 void vmw_otables_takedown(struct vmw_private *dev_priv)
 303 {
 304         SVGAOTableType i;
 305         struct ttm_buffer_object *bo = dev_priv->otable_bo;
 306         int ret;
 307
 308         for (i = 0; i < SVGA_OTABLE_DX9_MAX - VMW_OTABLE_SETUP_SUB; ++i)
 309                 vmw_takedown_otable_base(dev_priv, i,
 310                                          &dev_priv->otables[i]);
 311
 312         ret = ttm_bo_reserve(bo, false, true, false, false);
 313         BUG_ON(ret != 0);
 314
 315         vmw_fence_single_bo(bo, NULL);
 316         ttm_bo_unreserve(bo);
 317
 318         ttm_bo_unref(&dev_priv->otable_bo);
 319         kfree(dev_priv->otables);
 320         dev_priv->otables = NULL;
 321 }
 322
 323
 324 /*
 325  * vmw_mob_calculate_pt_pages - Calculate the number of page table pages
 326  * needed for a guest backed memory object.
 327  *
 328  * @data_pages:  Number of data pages in the memory object buffer.
 329  */
 330 static unsigned long vmw_mob_calculate_pt_pages(unsigned long data_pages)
 331 {
 332         unsigned long data_size = data_pages * PAGE_SIZE;
 333         unsigned long tot_size = 0;
 334
 335         while (likely(data_size > PAGE_SIZE)) {
 336                 data_size = DIV_ROUND_UP(data_size, PAGE_SIZE);
 337                 data_size *= VMW_PPN_SIZE;
 338                 tot_size += (data_size + PAGE_SIZE - 1) & PAGE_MASK;
 339         }
 340
 341         return tot_size >> PAGE_SHIFT;
 342 }
 343
 344 /*
 345  * vmw_mob_create - Create a mob, but don't populate it.
 346  *
 347  * @data_pages:  Number of data pages of the underlying buffer object.
 348  */
 349 struct vmw_mob *vmw_mob_create(unsigned long data_pages)
 350 {
 351         struct vmw_mob *mob = kzalloc(sizeof(*mob), GFP_KERNEL);
 352
 353         if (unlikely(mob == NULL))
 354                 return NULL;
 355
 356         mob->num_pages = vmw_mob_calculate_pt_pages(data_pages);
 357
 358         return mob;
 359 }
 360
 361 /*
 362  * vmw_mob_pt_populate - Populate the mob pagetable
 363  *
 364  * @mob:         Pointer to the mob the pagetable of which we want to
 365  *               populate.
 366  *
 367  * This function allocates memory to be used for the pagetable, and
 368  * adjusts TTM memory accounting accordingly. Returns ENOMEM if
 369  * memory resources aren't sufficient and may cause TTM buffer objects
 370  * to be swapped out by using the TTM memory accounting function.
 371  */
 372 static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
 373                                struct vmw_mob *mob)
 374 {
 375         int ret;
 376         BUG_ON(mob->pt_bo != NULL);
 377
 378         ret = ttm_bo_create(&dev_priv->bdev, mob->num_pages * PAGE_SIZE,
 379                             ttm_bo_type_device,
 380                             &vmw_sys_ne_placement,
 381                             0, false, NULL, &mob->pt_bo);
 382         if (unlikely(ret != 0))
 383                 return ret;
 384
 385         ret = ttm_bo_reserve(mob->pt_bo, false, true, false, false);
 386
 387         BUG_ON(ret != 0);
 388         ret = vmw_bo_driver.ttm_tt_populate(mob->pt_bo->ttm);
 389         if (unlikely(ret != 0))
 390                 goto out_unreserve;
 391         ret = vmw_bo_map_dma(mob->pt_bo);
 392         if (unlikely(ret != 0))
 393                 goto out_unreserve;
 394
 395         ttm_bo_unreserve(mob->pt_bo);
 396
 397         return 0;
 398
 399 out_unreserve:
 400         ttm_bo_unreserve(mob->pt_bo);
 401         ttm_bo_unref(&mob->pt_bo);
 402
 403         return ret;
 404 }
 405
 406
 407 /*
 408  * vmw_mob_build_pt - Build a pagetable
 409  *
 410  * @data_addr:      Array of DMA addresses to the underlying buffer
 411  *                  object's data pages.
 412  * @num_data_pages: Number of buffer object data pages.
 413  * @pt_pages:       Array of page pointers to the page table pages.
 414  *
 415  * Returns the number of page table pages actually used.
 416  * Uses atomic kmaps of highmem pages to avoid TLB thrashing.
 417  */
 418 static unsigned long vmw_mob_build_pt(struct vmw_piter *data_iter,
 419                                       unsigned long num_data_pages,
 420                                       struct vmw_piter *pt_iter)
 421 {
 422         unsigned long pt_size = num_data_pages * VMW_PPN_SIZE;
 423         unsigned long num_pt_pages = DIV_ROUND_UP(pt_size, PAGE_SIZE);
 424         unsigned long pt_page;
 425         uint32_t *addr, *save_addr;
 426         unsigned long i;
 427         struct page *page;
 428
 429         for (pt_page = 0; pt_page < num_pt_pages; ++pt_page) {
 430                 page = vmw_piter_page(pt_iter);
 431
 432                 save_addr = addr = kmap_atomic(page);
 433
 434                 for (i = 0; i < PAGE_SIZE / VMW_PPN_SIZE; ++i) {
 435                         u32 tmp = vmw_piter_dma_addr(data_iter) >> PAGE_SHIFT;
 436                         *addr++ = tmp;
 437                         if (unlikely(--num_data_pages == 0))
 438                                 break;
 439                         WARN_ON(!vmw_piter_next(data_iter));
 440                 }
 441                 kunmap_atomic(save_addr);
 442                 vmw_piter_next(pt_iter);
 443         }
 444
 445         return num_pt_pages;
 446 }
 447
 448 /*
 449  * vmw_mob_build_pt - Set up a multilevel mob pagetable
 450  *
 451  * @mob:            Pointer to a mob whose page table needs setting up.
 452  * @data_addr       Array of DMA addresses to the buffer object's data
 453  *                  pages.
 454  * @num_data_pages: Number of buffer object data pages.
 455  *
 456  * Uses tail recursion to set up a multilevel mob page table.
 457  */
 458 static void vmw_mob_pt_setup(struct vmw_mob *mob,
 459                              struct vmw_piter data_iter,
 460                              unsigned long num_data_pages)
 461 {
 462         unsigned long num_pt_pages = 0;
 463         struct ttm_buffer_object *bo = mob->pt_bo;
 464         struct vmw_piter save_pt_iter;
 465         struct vmw_piter pt_iter;
 466         const struct vmw_sg_table *vsgt;
 467         int ret;
 468
 469         ret = ttm_bo_reserve(bo, false, true, false, 0);
 470         BUG_ON(ret != 0);
 471
 472         vsgt = vmw_bo_sg_table(bo);
 473         vmw_piter_start(&pt_iter, vsgt, 0);
 474         BUG_ON(!vmw_piter_next(&pt_iter));
 475         mob->pt_level = 0;
 476         while (likely(num_data_pages > 1)) {
 477                 ++mob->pt_level;
 478                 BUG_ON(mob->pt_level > 2);
 479                 save_pt_iter = pt_iter;
 480                 num_pt_pages = vmw_mob_build_pt(&data_iter, num_data_pages,
 481                                                 &pt_iter);
 482                 data_iter = save_pt_iter;
 483                 num_data_pages = num_pt_pages;
 484         }
 485
 486         mob->pt_root_page = vmw_piter_dma_addr(&save_pt_iter);
 487         ttm_bo_unreserve(bo);
 488 }
 489
 490 /*
 491  * vmw_mob_destroy - Destroy a mob, unpopulating first if necessary.
 492  *
 493  * @mob:            Pointer to a mob to destroy.
 494  */
 495 void vmw_mob_destroy(struct vmw_mob *mob)
 496 {
 497         if (mob->pt_bo)
 498                 ttm_bo_unref(&mob->pt_bo);
 499         kfree(mob);
 500 }
 501
 502 /*
 503  * vmw_mob_unbind - Hide a mob from the device.
 504  *
 505  * @dev_priv:       Pointer to a device private.
 506  * @mob_id:         Device id of the mob to unbind.
 507  */
 508 void vmw_mob_unbind(struct vmw_private *dev_priv,
 509                     struct vmw_mob *mob)
 510 {
 511         struct {
 512                 SVGA3dCmdHeader header;
 513                 SVGA3dCmdDestroyGBMob body;
 514         } *cmd;
 515         int ret;
 516         struct ttm_buffer_object *bo = mob->pt_bo;
 517
 518         if (bo) {
 519                 ret = ttm_bo_reserve(bo, false, true, false, 0);
 520                 /*
 521                  * Noone else should be using this buffer.
 522                  */
 523                 BUG_ON(ret != 0);
 524         }
 525
 526         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 527         if (unlikely(cmd == NULL)) {
 528                 DRM_ERROR("Failed reserving FIFO space for Memory "
 529                           "Object unbinding.\n");
 530         }
 531         cmd->header.id = SVGA_3D_CMD_DESTROY_GB_MOB;
 532         cmd->header.size = sizeof(cmd->body);
 533         cmd->body.mobid = mob->id;
 534         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 535         if (bo) {
 536                 vmw_fence_single_bo(bo, NULL);
 537                 ttm_bo_unreserve(bo);
 538         }
 539         vmw_3d_resource_dec(dev_priv, false);
 540 }
 541
 542 /*
 543  * vmw_mob_bind - Make a mob visible to the device after first
 544  *                populating it if necessary.
 545  *
 546  * @dev_priv:       Pointer to a device private.
 547  * @mob:            Pointer to the mob we're making visible.
 548  * @data_addr:      Array of DMA addresses to the data pages of the underlying
 549  *                  buffer object.
 550  * @num_data_pages: Number of data pages of the underlying buffer
 551  *                  object.
 552  * @mob_id:         Device id of the mob to bind
 553  *
 554  * This function is intended to be interfaced with the ttm_tt backend
 555  * code.
 556  */
 557 int vmw_mob_bind(struct vmw_private *dev_priv,
 558                  struct vmw_mob *mob,
 559                  const struct vmw_sg_table *vsgt,
 560                  unsigned long num_data_pages,
 561                  int32_t mob_id)
 562 {
 563         int ret;
 564         bool pt_set_up = false;
 565         struct vmw_piter data_iter;
 566         struct {
 567                 SVGA3dCmdHeader header;
 568                 SVGA3dCmdDefineGBMob body;
 569         } *cmd;
 570
 571         mob->id = mob_id;
 572         vmw_piter_start(&data_iter, vsgt, 0);
 573         if (unlikely(!vmw_piter_next(&data_iter)))
 574                 return 0;
 575
 576         if (likely(num_data_pages == 1)) {
 577                 mob->pt_level = SVGA3D_MOBFMT_PTDEPTH_0;
 578                 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
 579         } else if (vsgt->num_regions == 1) {
 580                 mob->pt_level = SVGA3D_MOBFMT_RANGE;
 581                 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
 582         } else if (unlikely(mob->pt_bo == NULL)) {
 583                 ret = vmw_mob_pt_populate(dev_priv, mob);
 584                 if (unlikely(ret != 0))
 585                         return ret;
 586
 587                 vmw_mob_pt_setup(mob, data_iter, num_data_pages);
 588                 pt_set_up = true;
 589         }
 590
 591         (void) vmw_3d_resource_inc(dev_priv, false);
 592
 593         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 594         if (unlikely(cmd == NULL)) {
 595                 DRM_ERROR("Failed reserving FIFO space for Memory "
 596                           "Object binding.\n");
 597                 goto out_no_cmd_space;
 598         }
 599
 600         cmd->header.id = SVGA_3D_CMD_DEFINE_GB_MOB;
 601         cmd->header.size = sizeof(cmd->body);
 602         cmd->body.mobid = mob_id;
 603         cmd->body.ptDepth = mob->pt_level;
 604         cmd->body.base = mob->pt_root_page >> PAGE_SHIFT;
 605         cmd->body.sizeInBytes = num_data_pages * PAGE_SIZE;
 606
 607         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 608
 609         return 0;
 610
 611 out_no_cmd_space:
 612         vmw_3d_resource_dec(dev_priv, false);
 613         if (pt_set_up)
 614                 ttm_bo_unref(&mob->pt_bo);
 615
 616         return -ENOMEM;
 617 }