Pileus Git - ~andy/linux/blob - 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 #ifdef CONFIG_64BIT
  37 #define VMW_PPN_SIZE 8
  38 #define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PTDEPTH64_0
  39 #define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PTDEPTH64_1
  40 #define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PTDEPTH64_2
  41 #else
  42 #define VMW_PPN_SIZE 4
  43 #define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PTDEPTH_0
  44 #define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PTDEPTH_1
  45 #define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PTDEPTH_2
  46 #endif
  47
  48 /*
  49  * struct vmw_mob - Structure containing page table and metadata for a
  50  * Guest Memory OBject.
  51  *
  52  * @num_pages       Number of pages that make up the page table.
  53  * @pt_level        The indirection level of the page table. 0-2.
  54  * @pt_root_page    DMA address of the level 0 page of the page table.
  55  */
  56 struct vmw_mob {
  57         struct ttm_buffer_object *pt_bo;
  58         unsigned long num_pages;
  59         unsigned pt_level;
  60         dma_addr_t pt_root_page;
  61         uint32_t id;
  62 };
  63
  64 /*
  65  * struct vmw_otable - Guest Memory OBject table metadata
  66  *
  67  * @size:           Size of the table (page-aligned).
  68  * @page_table:     Pointer to a struct vmw_mob holding the page table.
  69  */
  70 struct vmw_otable {
  71         unsigned long size;
  72         struct vmw_mob *page_table;
  73 };
  74
  75 static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
  76                                struct vmw_mob *mob);
  77 static void vmw_mob_pt_setup(struct vmw_mob *mob,
  78                              struct vmw_piter data_iter,
  79                              unsigned long num_data_pages);
  80
  81 /*
  82  * vmw_setup_otable_base - Issue an object table base setup command to
  83  * the device
  84  *
  85  * @dev_priv:       Pointer to a device private structure
  86  * @type:           Type of object table base
  87  * @offset          Start of table offset into dev_priv::otable_bo
  88  * @otable          Pointer to otable metadata;
  89  *
  90  * This function returns -ENOMEM if it fails to reserve fifo space,
  91  * and may block waiting for fifo space.
  92  */
  93 static int vmw_setup_otable_base(struct vmw_private *dev_priv,
  94                                  SVGAOTableType type,
  95                                  unsigned long offset,
  96                                  struct vmw_otable *otable)
  97 {
  98         struct {
  99                 SVGA3dCmdHeader header;
 100                 SVGA3dCmdSetOTableBase64 body;
 101         } *cmd;
 102         struct vmw_mob *mob;
 103         const struct vmw_sg_table *vsgt;
 104         struct vmw_piter iter;
 105         int ret;
 106
 107         BUG_ON(otable->page_table != NULL);
 108
 109         vsgt = vmw_bo_sg_table(dev_priv->otable_bo);
 110         vmw_piter_start(&iter, vsgt, offset >> PAGE_SHIFT);
 111         WARN_ON(!vmw_piter_next(&iter));
 112
 113         mob = vmw_mob_create(otable->size >> PAGE_SHIFT);
 114         if (unlikely(mob == NULL)) {
 115                 DRM_ERROR("Failed creating OTable page table.\n");
 116                 return -ENOMEM;
 117         }
 118
 119         if (otable->size <= PAGE_SIZE) {
 120                 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
 121                 mob->pt_root_page = vmw_piter_dma_addr(&iter);
 122         } else if (vsgt->num_regions == 1) {
 123                 mob->pt_level = SVGA3D_MOBFMT_RANGE;
 124                 mob->pt_root_page = vmw_piter_dma_addr(&iter);
 125         } else {
 126                 ret = vmw_mob_pt_populate(dev_priv, mob);
 127                 if (unlikely(ret != 0))
 128                         goto out_no_populate;
 129
 130                 vmw_mob_pt_setup(mob, iter, otable->size >> PAGE_SHIFT);
 131                 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1;
 132         }
 133
 134         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 135         if (unlikely(cmd == NULL)) {
 136                 DRM_ERROR("Failed reserving FIFO space for OTable setup.\n");
 137                 ret = -ENOMEM;
 138                 goto out_no_fifo;
 139         }
 140
 141         memset(cmd, 0, sizeof(*cmd));
 142         cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE64;
 143         cmd->header.size = sizeof(cmd->body);
 144         cmd->body.type = type;
 145         cmd->body.baseAddress = cpu_to_le64(mob->pt_root_page >> PAGE_SHIFT);
 146         cmd->body.sizeInBytes = otable->size;
 147         cmd->body.validSizeInBytes = 0;
 148         cmd->body.ptDepth = mob->pt_level;
 149
 150         /*
 151          * The device doesn't support this, But the otable size is
 152          * determined at compile-time, so this BUG shouldn't trigger
 153          * randomly.
 154          */
 155         BUG_ON(mob->pt_level == VMW_MOBFMT_PTDEPTH_2);
 156
 157         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 158         otable->page_table = mob;
 159
 160         return 0;
 161
 162 out_no_fifo:
 163 out_no_populate:
 164         vmw_mob_destroy(mob);
 165         return ret;
 166 }
 167
 168 /*
 169  * vmw_takedown_otable_base - Issue an object table base takedown command
 170  * to the device
 171  *
 172  * @dev_priv:       Pointer to a device private structure
 173  * @type:           Type of object table base
 174  *
 175  */
 176 static void vmw_takedown_otable_base(struct vmw_private *dev_priv,
 177                                      SVGAOTableType type,
 178                                      struct vmw_otable *otable)
 179 {
 180         struct {
 181                 SVGA3dCmdHeader header;
 182                 SVGA3dCmdSetOTableBase body;
 183         } *cmd;
 184         struct ttm_buffer_object *bo;
 185
 186         if (otable->page_table == NULL)
 187                 return;
 188
 189         bo = otable->page_table->pt_bo;
 190         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 191         if (unlikely(cmd == NULL))
 192                 DRM_ERROR("Failed reserving FIFO space for OTable setup.\n");
 193
 194         memset(cmd, 0, sizeof(*cmd));
 195         cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE;
 196         cmd->header.size = sizeof(cmd->body);
 197         cmd->body.type = type;
 198         cmd->body.baseAddress = 0;
 199         cmd->body.sizeInBytes = 0;
 200         cmd->body.validSizeInBytes = 0;
 201         cmd->body.ptDepth = SVGA3D_MOBFMT_INVALID;
 202         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 203
 204         if (bo) {
 205                 int ret;
 206
 207                 ret = ttm_bo_reserve(bo, false, true, false, NULL);
 208                 BUG_ON(ret != 0);
 209
 210                 vmw_fence_single_bo(bo, NULL);
 211                 ttm_bo_unreserve(bo);
 212         }
 213
 214         vmw_mob_destroy(otable->page_table);
 215         otable->page_table = NULL;
 216 }
 217
 218 /*
 219  * vmw_otables_setup - Set up guest backed memory object tables
 220  *
 221  * @dev_priv:       Pointer to a device private structure
 222  *
 223  * Takes care of the device guest backed surface
 224  * initialization, by setting up the guest backed memory object tables.
 225  * Returns 0 on success and various error codes on failure. A succesful return
 226  * means the object tables can be taken down using the vmw_otables_takedown
 227  * function.
 228  */
 229 int vmw_otables_setup(struct vmw_private *dev_priv)
 230 {
 231         unsigned long offset;
 232         unsigned long bo_size;
 233         struct vmw_otable *otables;
 234         SVGAOTableType i;
 235         int ret;
 236
 237         otables = kzalloc(SVGA_OTABLE_DX9_MAX * sizeof(*otables),
 238                           GFP_KERNEL);
 239         if (unlikely(otables == NULL)) {
 240                 DRM_ERROR("Failed to allocate space for otable "
 241                           "metadata.\n");
 242                 return -ENOMEM;
 243         }
 244
 245         otables[SVGA_OTABLE_MOB].size =
 246                 VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE;
 247         otables[SVGA_OTABLE_SURFACE].size =
 248                 VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE;
 249         otables[SVGA_OTABLE_CONTEXT].size =
 250                 VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE;
 251         otables[SVGA_OTABLE_SHADER].size =
 252                 VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE;
 253         otables[SVGA_OTABLE_SCREEN_TARGET].size =
 254                 VMWGFX_NUM_GB_SCREEN_TARGET *
 255                 SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE;
 256
 257         bo_size = 0;
 258         for (i = 0; i < SVGA_OTABLE_DX9_MAX; ++i) {
 259                 otables[i].size =
 260                         (otables[i].size + PAGE_SIZE - 1) & PAGE_MASK;
 261                 bo_size += otables[i].size;
 262         }
 263
 264         ret = ttm_bo_create(&dev_priv->bdev, bo_size,
 265                             ttm_bo_type_device,
 266                             &vmw_sys_ne_placement,
 267                             0, false, NULL,
 268                             &dev_priv->otable_bo);
 269
 270         if (unlikely(ret != 0))
 271                 goto out_no_bo;
 272
 273         ret = ttm_bo_reserve(dev_priv->otable_bo, false, true, false, NULL);
 274         BUG_ON(ret != 0);
 275         ret = vmw_bo_driver.ttm_tt_populate(dev_priv->otable_bo->ttm);
 276         if (unlikely(ret != 0))
 277                 goto out_unreserve;
 278         ret = vmw_bo_map_dma(dev_priv->otable_bo);
 279         if (unlikely(ret != 0))
 280                 goto out_unreserve;
 281
 282         ttm_bo_unreserve(dev_priv->otable_bo);
 283
 284         offset = 0;
 285         for (i = 0; i < SVGA_OTABLE_DX9_MAX - VMW_OTABLE_SETUP_SUB; ++i) {
 286                 ret = vmw_setup_otable_base(dev_priv, i, offset,
 287                                             &otables[i]);
 288                 if (unlikely(ret != 0))
 289                         goto out_no_setup;
 290                 offset += otables[i].size;
 291         }
 292
 293         dev_priv->otables = otables;
 294         return 0;
 295
 296 out_unreserve:
 297         ttm_bo_unreserve(dev_priv->otable_bo);
 298 out_no_setup:
 299         for (i = 0; i < SVGA_OTABLE_DX9_MAX - VMW_OTABLE_SETUP_SUB; ++i)
 300                 vmw_takedown_otable_base(dev_priv, i, &otables[i]);
 301
 302         ttm_bo_unref(&dev_priv->otable_bo);
 303 out_no_bo:
 304         kfree(otables);
 305         return ret;
 306 }
 307
 308
 309 /*
 310  * vmw_otables_takedown - Take down guest backed memory object tables
 311  *
 312  * @dev_priv:       Pointer to a device private structure
 313  *
 314  * Take down the Guest Memory Object tables.
 315  */
 316 void vmw_otables_takedown(struct vmw_private *dev_priv)
 317 {
 318         SVGAOTableType i;
 319         struct ttm_buffer_object *bo = dev_priv->otable_bo;
 320         int ret;
 321
 322         for (i = 0; i < SVGA_OTABLE_DX9_MAX - VMW_OTABLE_SETUP_SUB; ++i)
 323                 vmw_takedown_otable_base(dev_priv, i,
 324                                          &dev_priv->otables[i]);
 325
 326         ret = ttm_bo_reserve(bo, false, true, false, NULL);
 327         BUG_ON(ret != 0);
 328
 329         vmw_fence_single_bo(bo, NULL);
 330         ttm_bo_unreserve(bo);
 331
 332         ttm_bo_unref(&dev_priv->otable_bo);
 333         kfree(dev_priv->otables);
 334         dev_priv->otables = NULL;
 335 }
 336
 337
 338 /*
 339  * vmw_mob_calculate_pt_pages - Calculate the number of page table pages
 340  * needed for a guest backed memory object.
 341  *
 342  * @data_pages:  Number of data pages in the memory object buffer.
 343  */
 344 static unsigned long vmw_mob_calculate_pt_pages(unsigned long data_pages)
 345 {
 346         unsigned long data_size = data_pages * PAGE_SIZE;
 347         unsigned long tot_size = 0;
 348
 349         while (likely(data_size > PAGE_SIZE)) {
 350                 data_size = DIV_ROUND_UP(data_size, PAGE_SIZE);
 351                 data_size *= VMW_PPN_SIZE;
 352                 tot_size += (data_size + PAGE_SIZE - 1) & PAGE_MASK;
 353         }
 354
 355         return tot_size >> PAGE_SHIFT;
 356 }
 357
 358 /*
 359  * vmw_mob_create - Create a mob, but don't populate it.
 360  *
 361  * @data_pages:  Number of data pages of the underlying buffer object.
 362  */
 363 struct vmw_mob *vmw_mob_create(unsigned long data_pages)
 364 {
 365         struct vmw_mob *mob = kzalloc(sizeof(*mob), GFP_KERNEL);
 366
 367         if (unlikely(mob == NULL))
 368                 return NULL;
 369
 370         mob->num_pages = vmw_mob_calculate_pt_pages(data_pages);
 371
 372         return mob;
 373 }
 374
 375 /*
 376  * vmw_mob_pt_populate - Populate the mob pagetable
 377  *
 378  * @mob:         Pointer to the mob the pagetable of which we want to
 379  *               populate.
 380  *
 381  * This function allocates memory to be used for the pagetable, and
 382  * adjusts TTM memory accounting accordingly. Returns ENOMEM if
 383  * memory resources aren't sufficient and may cause TTM buffer objects
 384  * to be swapped out by using the TTM memory accounting function.
 385  */
 386 static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
 387                                struct vmw_mob *mob)
 388 {
 389         int ret;
 390         BUG_ON(mob->pt_bo != NULL);
 391
 392         ret = ttm_bo_create(&dev_priv->bdev, mob->num_pages * PAGE_SIZE,
 393                             ttm_bo_type_device,
 394                             &vmw_sys_ne_placement,
 395                             0, false, NULL, &mob->pt_bo);
 396         if (unlikely(ret != 0))
 397                 return ret;
 398
 399         ret = ttm_bo_reserve(mob->pt_bo, false, true, false, NULL);
 400
 401         BUG_ON(ret != 0);
 402         ret = vmw_bo_driver.ttm_tt_populate(mob->pt_bo->ttm);
 403         if (unlikely(ret != 0))
 404                 goto out_unreserve;
 405         ret = vmw_bo_map_dma(mob->pt_bo);
 406         if (unlikely(ret != 0))
 407                 goto out_unreserve;
 408
 409         ttm_bo_unreserve(mob->pt_bo);
 410
 411         return 0;
 412
 413 out_unreserve:
 414         ttm_bo_unreserve(mob->pt_bo);
 415         ttm_bo_unref(&mob->pt_bo);
 416
 417         return ret;
 418 }
 419
 420 /**
 421  * vmw_mob_assign_ppn - Assign a value to a page table entry
 422  *
 423  * @addr: Pointer to pointer to page table entry.
 424  * @val: The page table entry
 425  *
 426  * Assigns a value to a page table entry pointed to by *@addr and increments
 427  * *@addr according to the page table entry size.
 428  */
 429 #if (VMW_PPN_SIZE == 8)
 430 static void vmw_mob_assign_ppn(__le32 **addr, dma_addr_t val)
 431 {
 432         *((__le64 *) *addr) = cpu_to_le64(val >> PAGE_SHIFT);
 433         *addr += 2;
 434 }
 435 #else
 436 static void vmw_mob_assign_ppn(__le32 **addr, dma_addr_t val)
 437 {
 438         *(*addr)++ = cpu_to_le32(val >> PAGE_SHIFT);
 439 }
 440 #endif
 441
 442 /*
 443  * vmw_mob_build_pt - Build a pagetable
 444  *
 445  * @data_addr:      Array of DMA addresses to the underlying buffer
 446  *                  object's data pages.
 447  * @num_data_pages: Number of buffer object data pages.
 448  * @pt_pages:       Array of page pointers to the page table pages.
 449  *
 450  * Returns the number of page table pages actually used.
 451  * Uses atomic kmaps of highmem pages to avoid TLB thrashing.
 452  */
 453 static unsigned long vmw_mob_build_pt(struct vmw_piter *data_iter,
 454                                       unsigned long num_data_pages,
 455                                       struct vmw_piter *pt_iter)
 456 {
 457         unsigned long pt_size = num_data_pages * VMW_PPN_SIZE;
 458         unsigned long num_pt_pages = DIV_ROUND_UP(pt_size, PAGE_SIZE);
 459         unsigned long pt_page;
 460         __le32 *addr, *save_addr;
 461         unsigned long i;
 462         struct page *page;
 463
 464         for (pt_page = 0; pt_page < num_pt_pages; ++pt_page) {
 465                 page = vmw_piter_page(pt_iter);
 466
 467                 save_addr = addr = kmap_atomic(page);
 468
 469                 for (i = 0; i < PAGE_SIZE / VMW_PPN_SIZE; ++i) {
 470                         vmw_mob_assign_ppn(&addr,
 471                                            vmw_piter_dma_addr(data_iter));
 472                         if (unlikely(--num_data_pages == 0))
 473                                 break;
 474                         WARN_ON(!vmw_piter_next(data_iter));
 475                 }
 476                 kunmap_atomic(save_addr);
 477                 vmw_piter_next(pt_iter);
 478         }
 479
 480         return num_pt_pages;
 481 }
 482
 483 /*
 484  * vmw_mob_build_pt - Set up a multilevel mob pagetable
 485  *
 486  * @mob:            Pointer to a mob whose page table needs setting up.
 487  * @data_addr       Array of DMA addresses to the buffer object's data
 488  *                  pages.
 489  * @num_data_pages: Number of buffer object data pages.
 490  *
 491  * Uses tail recursion to set up a multilevel mob page table.
 492  */
 493 static void vmw_mob_pt_setup(struct vmw_mob *mob,
 494                              struct vmw_piter data_iter,
 495                              unsigned long num_data_pages)
 496 {
 497         unsigned long num_pt_pages = 0;
 498         struct ttm_buffer_object *bo = mob->pt_bo;
 499         struct vmw_piter save_pt_iter;
 500         struct vmw_piter pt_iter;
 501         const struct vmw_sg_table *vsgt;
 502         int ret;
 503
 504         ret = ttm_bo_reserve(bo, false, true, false, NULL);
 505         BUG_ON(ret != 0);
 506
 507         vsgt = vmw_bo_sg_table(bo);
 508         vmw_piter_start(&pt_iter, vsgt, 0);
 509         BUG_ON(!vmw_piter_next(&pt_iter));
 510         mob->pt_level = 0;
 511         while (likely(num_data_pages > 1)) {
 512                 ++mob->pt_level;
 513                 BUG_ON(mob->pt_level > 2);
 514                 save_pt_iter = pt_iter;
 515                 num_pt_pages = vmw_mob_build_pt(&data_iter, num_data_pages,
 516                                                 &pt_iter);
 517                 data_iter = save_pt_iter;
 518                 num_data_pages = num_pt_pages;
 519         }
 520
 521         mob->pt_root_page = vmw_piter_dma_addr(&save_pt_iter);
 522         ttm_bo_unreserve(bo);
 523 }
 524
 525 /*
 526  * vmw_mob_destroy - Destroy a mob, unpopulating first if necessary.
 527  *
 528  * @mob:            Pointer to a mob to destroy.
 529  */
 530 void vmw_mob_destroy(struct vmw_mob *mob)
 531 {
 532         if (mob->pt_bo)
 533                 ttm_bo_unref(&mob->pt_bo);
 534         kfree(mob);
 535 }
 536
 537 /*
 538  * vmw_mob_unbind - Hide a mob from the device.
 539  *
 540  * @dev_priv:       Pointer to a device private.
 541  * @mob_id:         Device id of the mob to unbind.
 542  */
 543 void vmw_mob_unbind(struct vmw_private *dev_priv,
 544                     struct vmw_mob *mob)
 545 {
 546         struct {
 547                 SVGA3dCmdHeader header;
 548                 SVGA3dCmdDestroyGBMob body;
 549         } *cmd;
 550         int ret;
 551         struct ttm_buffer_object *bo = mob->pt_bo;
 552
 553         if (bo) {
 554                 ret = ttm_bo_reserve(bo, false, true, false, NULL);
 555                 /*
 556                  * Noone else should be using this buffer.
 557                  */
 558                 BUG_ON(ret != 0);
 559         }
 560
 561         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 562         if (unlikely(cmd == NULL)) {
 563                 DRM_ERROR("Failed reserving FIFO space for Memory "
 564                           "Object unbinding.\n");
 565         }
 566         cmd->header.id = SVGA_3D_CMD_DESTROY_GB_MOB;
 567         cmd->header.size = sizeof(cmd->body);
 568         cmd->body.mobid = mob->id;
 569         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 570         if (bo) {
 571                 vmw_fence_single_bo(bo, NULL);
 572                 ttm_bo_unreserve(bo);
 573         }
 574         vmw_3d_resource_dec(dev_priv, false);
 575 }
 576
 577 /*
 578  * vmw_mob_bind - Make a mob visible to the device after first
 579  *                populating it if necessary.
 580  *
 581  * @dev_priv:       Pointer to a device private.
 582  * @mob:            Pointer to the mob we're making visible.
 583  * @data_addr:      Array of DMA addresses to the data pages of the underlying
 584  *                  buffer object.
 585  * @num_data_pages: Number of data pages of the underlying buffer
 586  *                  object.
 587  * @mob_id:         Device id of the mob to bind
 588  *
 589  * This function is intended to be interfaced with the ttm_tt backend
 590  * code.
 591  */
 592 int vmw_mob_bind(struct vmw_private *dev_priv,
 593                  struct vmw_mob *mob,
 594                  const struct vmw_sg_table *vsgt,
 595                  unsigned long num_data_pages,
 596                  int32_t mob_id)
 597 {
 598         int ret;
 599         bool pt_set_up = false;
 600         struct vmw_piter data_iter;
 601         struct {
 602                 SVGA3dCmdHeader header;
 603                 SVGA3dCmdDefineGBMob64 body;
 604         } *cmd;
 605
 606         mob->id = mob_id;
 607         vmw_piter_start(&data_iter, vsgt, 0);
 608         if (unlikely(!vmw_piter_next(&data_iter)))
 609                 return 0;
 610
 611         if (likely(num_data_pages == 1)) {
 612                 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
 613                 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
 614         } else if (vsgt->num_regions == 1) {
 615                 mob->pt_level = SVGA3D_MOBFMT_RANGE;
 616                 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
 617         } else if (unlikely(mob->pt_bo == NULL)) {
 618                 ret = vmw_mob_pt_populate(dev_priv, mob);
 619                 if (unlikely(ret != 0))
 620                         return ret;
 621
 622                 vmw_mob_pt_setup(mob, data_iter, num_data_pages);
 623                 pt_set_up = true;
 624                 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1;
 625         }
 626
 627         (void) vmw_3d_resource_inc(dev_priv, false);
 628
 629         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 630         if (unlikely(cmd == NULL)) {
 631                 DRM_ERROR("Failed reserving FIFO space for Memory "
 632                           "Object binding.\n");
 633                 goto out_no_cmd_space;
 634         }
 635
 636         cmd->header.id = SVGA_3D_CMD_DEFINE_GB_MOB64;
 637         cmd->header.size = sizeof(cmd->body);
 638         cmd->body.mobid = mob_id;
 639         cmd->body.ptDepth = mob->pt_level;
 640         cmd->body.base = cpu_to_le64(mob->pt_root_page >> PAGE_SHIFT);
 641         cmd->body.sizeInBytes = num_data_pages * PAGE_SIZE;
 642
 643         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 644
 645         return 0;
 646
 647 out_no_cmd_space:
 648         vmw_3d_resource_dec(dev_priv, false);
 649         if (pt_set_up)
 650                 ttm_bo_unref(&mob->pt_bo);
 651
 652         return -ENOMEM;
 653 }