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 = 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 "
 193                           "takedown.\n");
 194                 return;
 195         }
 196
 197         memset(cmd, 0, sizeof(*cmd));
 198         cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE;
 199         cmd->header.size = sizeof(cmd->body);
 200         cmd->body.type = type;
 201         cmd->body.baseAddress = 0;
 202         cmd->body.sizeInBytes = 0;
 203         cmd->body.validSizeInBytes = 0;
 204         cmd->body.ptDepth = SVGA3D_MOBFMT_INVALID;
 205         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 206
 207         if (bo) {
 208                 int ret;
 209
 210                 ret = ttm_bo_reserve(bo, false, true, false, NULL);
 211                 BUG_ON(ret != 0);
 212
 213                 vmw_fence_single_bo(bo, NULL);
 214                 ttm_bo_unreserve(bo);
 215         }
 216
 217         vmw_mob_destroy(otable->page_table);
 218         otable->page_table = NULL;
 219 }
 220
 221 /*
 222  * vmw_otables_setup - Set up guest backed memory object tables
 223  *
 224  * @dev_priv:       Pointer to a device private structure
 225  *
 226  * Takes care of the device guest backed surface
 227  * initialization, by setting up the guest backed memory object tables.
 228  * Returns 0 on success and various error codes on failure. A succesful return
 229  * means the object tables can be taken down using the vmw_otables_takedown
 230  * function.
 231  */
 232 int vmw_otables_setup(struct vmw_private *dev_priv)
 233 {
 234         unsigned long offset;
 235         unsigned long bo_size;
 236         struct vmw_otable *otables;
 237         SVGAOTableType i;
 238         int ret;
 239
 240         otables = kzalloc(SVGA_OTABLE_DX9_MAX * sizeof(*otables),
 241                           GFP_KERNEL);
 242         if (unlikely(otables == NULL)) {
 243                 DRM_ERROR("Failed to allocate space for otable "
 244                           "metadata.\n");
 245                 return -ENOMEM;
 246         }
 247
 248         otables[SVGA_OTABLE_MOB].size =
 249                 VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE;
 250         otables[SVGA_OTABLE_SURFACE].size =
 251                 VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE;
 252         otables[SVGA_OTABLE_CONTEXT].size =
 253                 VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE;
 254         otables[SVGA_OTABLE_SHADER].size =
 255                 VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE;
 256         otables[SVGA_OTABLE_SCREEN_TARGET].size =
 257                 VMWGFX_NUM_GB_SCREEN_TARGET *
 258                 SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE;
 259
 260         bo_size = 0;
 261         for (i = 0; i < SVGA_OTABLE_DX9_MAX; ++i) {
 262                 otables[i].size =
 263                         (otables[i].size + PAGE_SIZE - 1) & PAGE_MASK;
 264                 bo_size += otables[i].size;
 265         }
 266
 267         ret = ttm_bo_create(&dev_priv->bdev, bo_size,
 268                             ttm_bo_type_device,
 269                             &vmw_sys_ne_placement,
 270                             0, false, NULL,
 271                             &dev_priv->otable_bo);
 272
 273         if (unlikely(ret != 0))
 274                 goto out_no_bo;
 275
 276         ret = ttm_bo_reserve(dev_priv->otable_bo, false, true, false, NULL);
 277         BUG_ON(ret != 0);
 278         ret = vmw_bo_driver.ttm_tt_populate(dev_priv->otable_bo->ttm);
 279         if (unlikely(ret != 0))
 280                 goto out_unreserve;
 281         ret = vmw_bo_map_dma(dev_priv->otable_bo);
 282         if (unlikely(ret != 0))
 283                 goto out_unreserve;
 284
 285         ttm_bo_unreserve(dev_priv->otable_bo);
 286
 287         offset = 0;
 288         for (i = 0; i < SVGA_OTABLE_DX9_MAX - VMW_OTABLE_SETUP_SUB; ++i) {
 289                 ret = vmw_setup_otable_base(dev_priv, i, offset,
 290                                             &otables[i]);
 291                 if (unlikely(ret != 0))
 292                         goto out_no_setup;
 293                 offset += otables[i].size;
 294         }
 295
 296         dev_priv->otables = otables;
 297         return 0;
 298
 299 out_unreserve:
 300         ttm_bo_unreserve(dev_priv->otable_bo);
 301 out_no_setup:
 302         for (i = 0; i < SVGA_OTABLE_DX9_MAX - VMW_OTABLE_SETUP_SUB; ++i)
 303                 vmw_takedown_otable_base(dev_priv, i, &otables[i]);
 304
 305         ttm_bo_unref(&dev_priv->otable_bo);
 306 out_no_bo:
 307         kfree(otables);
 308         return ret;
 309 }
 310
 311
 312 /*
 313  * vmw_otables_takedown - Take down guest backed memory object tables
 314  *
 315  * @dev_priv:       Pointer to a device private structure
 316  *
 317  * Take down the Guest Memory Object tables.
 318  */
 319 void vmw_otables_takedown(struct vmw_private *dev_priv)
 320 {
 321         SVGAOTableType i;
 322         struct ttm_buffer_object *bo = dev_priv->otable_bo;
 323         int ret;
 324
 325         for (i = 0; i < SVGA_OTABLE_DX9_MAX - VMW_OTABLE_SETUP_SUB; ++i)
 326                 vmw_takedown_otable_base(dev_priv, i,
 327                                          &dev_priv->otables[i]);
 328
 329         ret = ttm_bo_reserve(bo, false, true, false, NULL);
 330         BUG_ON(ret != 0);
 331
 332         vmw_fence_single_bo(bo, NULL);
 333         ttm_bo_unreserve(bo);
 334
 335         ttm_bo_unref(&dev_priv->otable_bo);
 336         kfree(dev_priv->otables);
 337         dev_priv->otables = NULL;
 338 }
 339
 340
 341 /*
 342  * vmw_mob_calculate_pt_pages - Calculate the number of page table pages
 343  * needed for a guest backed memory object.
 344  *
 345  * @data_pages:  Number of data pages in the memory object buffer.
 346  */
 347 static unsigned long vmw_mob_calculate_pt_pages(unsigned long data_pages)
 348 {
 349         unsigned long data_size = data_pages * PAGE_SIZE;
 350         unsigned long tot_size = 0;
 351
 352         while (likely(data_size > PAGE_SIZE)) {
 353                 data_size = DIV_ROUND_UP(data_size, PAGE_SIZE);
 354                 data_size *= VMW_PPN_SIZE;
 355                 tot_size += (data_size + PAGE_SIZE - 1) & PAGE_MASK;
 356         }
 357
 358         return tot_size >> PAGE_SHIFT;
 359 }
 360
 361 /*
 362  * vmw_mob_create - Create a mob, but don't populate it.
 363  *
 364  * @data_pages:  Number of data pages of the underlying buffer object.
 365  */
 366 struct vmw_mob *vmw_mob_create(unsigned long data_pages)
 367 {
 368         struct vmw_mob *mob = kzalloc(sizeof(*mob), GFP_KERNEL);
 369
 370         if (unlikely(mob == NULL))
 371                 return NULL;
 372
 373         mob->num_pages = vmw_mob_calculate_pt_pages(data_pages);
 374
 375         return mob;
 376 }
 377
 378 /*
 379  * vmw_mob_pt_populate - Populate the mob pagetable
 380  *
 381  * @mob:         Pointer to the mob the pagetable of which we want to
 382  *               populate.
 383  *
 384  * This function allocates memory to be used for the pagetable, and
 385  * adjusts TTM memory accounting accordingly. Returns ENOMEM if
 386  * memory resources aren't sufficient and may cause TTM buffer objects
 387  * to be swapped out by using the TTM memory accounting function.
 388  */
 389 static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
 390                                struct vmw_mob *mob)
 391 {
 392         int ret;
 393         BUG_ON(mob->pt_bo != NULL);
 394
 395         ret = ttm_bo_create(&dev_priv->bdev, mob->num_pages * PAGE_SIZE,
 396                             ttm_bo_type_device,
 397                             &vmw_sys_ne_placement,
 398                             0, false, NULL, &mob->pt_bo);
 399         if (unlikely(ret != 0))
 400                 return ret;
 401
 402         ret = ttm_bo_reserve(mob->pt_bo, false, true, false, NULL);
 403
 404         BUG_ON(ret != 0);
 405         ret = vmw_bo_driver.ttm_tt_populate(mob->pt_bo->ttm);
 406         if (unlikely(ret != 0))
 407                 goto out_unreserve;
 408         ret = vmw_bo_map_dma(mob->pt_bo);
 409         if (unlikely(ret != 0))
 410                 goto out_unreserve;
 411
 412         ttm_bo_unreserve(mob->pt_bo);
 413
 414         return 0;
 415
 416 out_unreserve:
 417         ttm_bo_unreserve(mob->pt_bo);
 418         ttm_bo_unref(&mob->pt_bo);
 419
 420         return ret;
 421 }
 422
 423 /**
 424  * vmw_mob_assign_ppn - Assign a value to a page table entry
 425  *
 426  * @addr: Pointer to pointer to page table entry.
 427  * @val: The page table entry
 428  *
 429  * Assigns a value to a page table entry pointed to by *@addr and increments
 430  * *@addr according to the page table entry size.
 431  */
 432 #if (VMW_PPN_SIZE == 8)
 433 static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
 434 {
 435         *((u64 *) *addr) = val >> PAGE_SHIFT;
 436         *addr += 2;
 437 }
 438 #else
 439 static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
 440 {
 441         *(*addr)++ = val >> PAGE_SHIFT;
 442 }
 443 #endif
 444
 445 /*
 446  * vmw_mob_build_pt - Build a pagetable
 447  *
 448  * @data_addr:      Array of DMA addresses to the underlying buffer
 449  *                  object's data pages.
 450  * @num_data_pages: Number of buffer object data pages.
 451  * @pt_pages:       Array of page pointers to the page table pages.
 452  *
 453  * Returns the number of page table pages actually used.
 454  * Uses atomic kmaps of highmem pages to avoid TLB thrashing.
 455  */
 456 static unsigned long vmw_mob_build_pt(struct vmw_piter *data_iter,
 457                                       unsigned long num_data_pages,
 458                                       struct vmw_piter *pt_iter)
 459 {
 460         unsigned long pt_size = num_data_pages * VMW_PPN_SIZE;
 461         unsigned long num_pt_pages = DIV_ROUND_UP(pt_size, PAGE_SIZE);
 462         unsigned long pt_page;
 463         u32 *addr, *save_addr;
 464         unsigned long i;
 465         struct page *page;
 466
 467         for (pt_page = 0; pt_page < num_pt_pages; ++pt_page) {
 468                 page = vmw_piter_page(pt_iter);
 469
 470                 save_addr = addr = kmap_atomic(page);
 471
 472                 for (i = 0; i < PAGE_SIZE / VMW_PPN_SIZE; ++i) {
 473                         vmw_mob_assign_ppn(&addr,
 474                                            vmw_piter_dma_addr(data_iter));
 475                         if (unlikely(--num_data_pages == 0))
 476                                 break;
 477                         WARN_ON(!vmw_piter_next(data_iter));
 478                 }
 479                 kunmap_atomic(save_addr);
 480                 vmw_piter_next(pt_iter);
 481         }
 482
 483         return num_pt_pages;
 484 }
 485
 486 /*
 487  * vmw_mob_build_pt - Set up a multilevel mob pagetable
 488  *
 489  * @mob:            Pointer to a mob whose page table needs setting up.
 490  * @data_addr       Array of DMA addresses to the buffer object's data
 491  *                  pages.
 492  * @num_data_pages: Number of buffer object data pages.
 493  *
 494  * Uses tail recursion to set up a multilevel mob page table.
 495  */
 496 static void vmw_mob_pt_setup(struct vmw_mob *mob,
 497                              struct vmw_piter data_iter,
 498                              unsigned long num_data_pages)
 499 {
 500         unsigned long num_pt_pages = 0;
 501         struct ttm_buffer_object *bo = mob->pt_bo;
 502         struct vmw_piter save_pt_iter;
 503         struct vmw_piter pt_iter;
 504         const struct vmw_sg_table *vsgt;
 505         int ret;
 506
 507         ret = ttm_bo_reserve(bo, false, true, false, NULL);
 508         BUG_ON(ret != 0);
 509
 510         vsgt = vmw_bo_sg_table(bo);
 511         vmw_piter_start(&pt_iter, vsgt, 0);
 512         BUG_ON(!vmw_piter_next(&pt_iter));
 513         mob->pt_level = 0;
 514         while (likely(num_data_pages > 1)) {
 515                 ++mob->pt_level;
 516                 BUG_ON(mob->pt_level > 2);
 517                 save_pt_iter = pt_iter;
 518                 num_pt_pages = vmw_mob_build_pt(&data_iter, num_data_pages,
 519                                                 &pt_iter);
 520                 data_iter = save_pt_iter;
 521                 num_data_pages = num_pt_pages;
 522         }
 523
 524         mob->pt_root_page = vmw_piter_dma_addr(&save_pt_iter);
 525         ttm_bo_unreserve(bo);
 526 }
 527
 528 /*
 529  * vmw_mob_destroy - Destroy a mob, unpopulating first if necessary.
 530  *
 531  * @mob:            Pointer to a mob to destroy.
 532  */
 533 void vmw_mob_destroy(struct vmw_mob *mob)
 534 {
 535         if (mob->pt_bo)
 536                 ttm_bo_unref(&mob->pt_bo);
 537         kfree(mob);
 538 }
 539
 540 /*
 541  * vmw_mob_unbind - Hide a mob from the device.
 542  *
 543  * @dev_priv:       Pointer to a device private.
 544  * @mob_id:         Device id of the mob to unbind.
 545  */
 546 void vmw_mob_unbind(struct vmw_private *dev_priv,
 547                     struct vmw_mob *mob)
 548 {
 549         struct {
 550                 SVGA3dCmdHeader header;
 551                 SVGA3dCmdDestroyGBMob body;
 552         } *cmd;
 553         int ret;
 554         struct ttm_buffer_object *bo = mob->pt_bo;
 555
 556         if (bo) {
 557                 ret = ttm_bo_reserve(bo, false, true, false, NULL);
 558                 /*
 559                  * Noone else should be using this buffer.
 560                  */
 561                 BUG_ON(ret != 0);
 562         }
 563
 564         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 565         if (unlikely(cmd == NULL)) {
 566                 DRM_ERROR("Failed reserving FIFO space for Memory "
 567                           "Object unbinding.\n");
 568         } else {
 569                 cmd->header.id = SVGA_3D_CMD_DESTROY_GB_MOB;
 570                 cmd->header.size = sizeof(cmd->body);
 571                 cmd->body.mobid = mob->id;
 572                 vmw_fifo_commit(dev_priv, sizeof(*cmd));
 573         }
 574         if (bo) {
 575                 vmw_fence_single_bo(bo, NULL);
 576                 ttm_bo_unreserve(bo);
 577         }
 578         vmw_fifo_resource_dec(dev_priv);
 579 }
 580
 581 /*
 582  * vmw_mob_bind - Make a mob visible to the device after first
 583  *                populating it if necessary.
 584  *
 585  * @dev_priv:       Pointer to a device private.
 586  * @mob:            Pointer to the mob we're making visible.
 587  * @data_addr:      Array of DMA addresses to the data pages of the underlying
 588  *                  buffer object.
 589  * @num_data_pages: Number of data pages of the underlying buffer
 590  *                  object.
 591  * @mob_id:         Device id of the mob to bind
 592  *
 593  * This function is intended to be interfaced with the ttm_tt backend
 594  * code.
 595  */
 596 int vmw_mob_bind(struct vmw_private *dev_priv,
 597                  struct vmw_mob *mob,
 598                  const struct vmw_sg_table *vsgt,
 599                  unsigned long num_data_pages,
 600                  int32_t mob_id)
 601 {
 602         int ret;
 603         bool pt_set_up = false;
 604         struct vmw_piter data_iter;
 605         struct {
 606                 SVGA3dCmdHeader header;
 607                 SVGA3dCmdDefineGBMob64 body;
 608         } *cmd;
 609
 610         mob->id = mob_id;
 611         vmw_piter_start(&data_iter, vsgt, 0);
 612         if (unlikely(!vmw_piter_next(&data_iter)))
 613                 return 0;
 614
 615         if (likely(num_data_pages == 1)) {
 616                 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
 617                 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
 618         } else if (vsgt->num_regions == 1) {
 619                 mob->pt_level = SVGA3D_MOBFMT_RANGE;
 620                 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
 621         } else if (unlikely(mob->pt_bo == NULL)) {
 622                 ret = vmw_mob_pt_populate(dev_priv, mob);
 623                 if (unlikely(ret != 0))
 624                         return ret;
 625
 626                 vmw_mob_pt_setup(mob, data_iter, num_data_pages);
 627                 pt_set_up = true;
 628                 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1;
 629         }
 630
 631         vmw_fifo_resource_inc(dev_priv);
 632
 633         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 634         if (unlikely(cmd == NULL)) {
 635                 DRM_ERROR("Failed reserving FIFO space for Memory "
 636                           "Object binding.\n");
 637                 goto out_no_cmd_space;
 638         }
 639
 640         cmd->header.id = SVGA_3D_CMD_DEFINE_GB_MOB64;
 641         cmd->header.size = sizeof(cmd->body);
 642         cmd->body.mobid = mob_id;
 643         cmd->body.ptDepth = mob->pt_level;
 644         cmd->body.base = mob->pt_root_page >> PAGE_SHIFT;
 645         cmd->body.sizeInBytes = num_data_pages * PAGE_SIZE;
 646
 647         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 648
 649         return 0;
 650
 651 out_no_cmd_space:
 652         vmw_fifo_resource_dec(dev_priv);
 653         if (pt_set_up)
 654                 ttm_bo_unref(&mob->pt_bo);
 655
 656         return -ENOMEM;
 657 }