drivers/gpu/drm/vmwgfx/vmwgfx_mob.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2012-2015 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 static const struct vmw_otable pre_dx_tables[] = {
  71         {VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE, NULL, true},
  72         {VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE, NULL, true},
  73         {VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE, NULL, true},
  74         {VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE, NULL, true},
  75         {VMWGFX_NUM_GB_SCREEN_TARGET * SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE,
  76          NULL, VMWGFX_ENABLE_SCREEN_TARGET_OTABLE}
  77 };
  78
  79 static const struct vmw_otable dx_tables[] = {
  80         {VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE, NULL, true},
  81         {VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE, NULL, true},
  82         {VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE, NULL, true},
  83         {VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE, NULL, true},
  84         {VMWGFX_NUM_GB_SCREEN_TARGET * SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE,
  85          NULL, VMWGFX_ENABLE_SCREEN_TARGET_OTABLE},
  86         {VMWGFX_NUM_DXCONTEXT * sizeof(SVGAOTableDXContextEntry), NULL, true},
  87 };
  88
  89 static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
  90                                struct vmw_mob *mob);
  91 static void vmw_mob_pt_setup(struct vmw_mob *mob,
  92                              struct vmw_piter data_iter,
  93                              unsigned long num_data_pages);
  94
  95 /*
  96  * vmw_setup_otable_base - Issue an object table base setup command to
  97  * the device
  98  *
  99  * @dev_priv:       Pointer to a device private structure
 100  * @type:           Type of object table base
 101  * @offset          Start of table offset into dev_priv::otable_bo
 102  * @otable          Pointer to otable metadata;
 103  *
 104  * This function returns -ENOMEM if it fails to reserve fifo space,
 105  * and may block waiting for fifo space.
 106  */
 107 static int vmw_setup_otable_base(struct vmw_private *dev_priv,
 108                                  SVGAOTableType type,
 109                                  struct ttm_buffer_object *otable_bo,
 110                                  unsigned long offset,
 111                                  struct vmw_otable *otable)
 112 {
 113         struct {
 114                 SVGA3dCmdHeader header;
 115                 SVGA3dCmdSetOTableBase64 body;
 116         } *cmd;
 117         struct vmw_mob *mob;
 118         const struct vmw_sg_table *vsgt;
 119         struct vmw_piter iter;
 120         int ret;
 121
 122         BUG_ON(otable->page_table != NULL);
 123
 124         vsgt = vmw_bo_sg_table(otable_bo);
 125         vmw_piter_start(&iter, vsgt, offset >> PAGE_SHIFT);
 126         WARN_ON(!vmw_piter_next(&iter));
 127
 128         mob = vmw_mob_create(otable->size >> PAGE_SHIFT);
 129         if (unlikely(mob == NULL)) {
 130                 DRM_ERROR("Failed creating OTable page table.\n");
 131                 return -ENOMEM;
 132         }
 133
 134         if (otable->size <= PAGE_SIZE) {
 135                 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
 136                 mob->pt_root_page = vmw_piter_dma_addr(&iter);
 137         } else if (vsgt->num_regions == 1) {
 138                 mob->pt_level = SVGA3D_MOBFMT_RANGE;
 139                 mob->pt_root_page = vmw_piter_dma_addr(&iter);
 140         } else {
 141                 ret = vmw_mob_pt_populate(dev_priv, mob);
 142                 if (unlikely(ret != 0))
 143                         goto out_no_populate;
 144
 145                 vmw_mob_pt_setup(mob, iter, otable->size >> PAGE_SHIFT);
 146                 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1;
 147         }
 148
 149         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 150         if (unlikely(cmd == NULL)) {
 151                 DRM_ERROR("Failed reserving FIFO space for OTable setup.\n");
 152                 ret = -ENOMEM;
 153                 goto out_no_fifo;
 154         }
 155
 156         memset(cmd, 0, sizeof(*cmd));
 157         cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE64;
 158         cmd->header.size = sizeof(cmd->body);
 159         cmd->body.type = type;
 160         cmd->body.baseAddress = mob->pt_root_page >> PAGE_SHIFT;
 161         cmd->body.sizeInBytes = otable->size;
 162         cmd->body.validSizeInBytes = 0;
 163         cmd->body.ptDepth = mob->pt_level;
 164
 165         /*
 166          * The device doesn't support this, But the otable size is
 167          * determined at compile-time, so this BUG shouldn't trigger
 168          * randomly.
 169          */
 170         BUG_ON(mob->pt_level == VMW_MOBFMT_PTDEPTH_2);
 171
 172         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 173         otable->page_table = mob;
 174
 175         return 0;
 176
 177 out_no_fifo:
 178 out_no_populate:
 179         vmw_mob_destroy(mob);
 180         return ret;
 181 }
 182
 183 /*
 184  * vmw_takedown_otable_base - Issue an object table base takedown command
 185  * to the device
 186  *
 187  * @dev_priv:       Pointer to a device private structure
 188  * @type:           Type of object table base
 189  *
 190  */
 191 static void vmw_takedown_otable_base(struct vmw_private *dev_priv,
 192                                      SVGAOTableType type,
 193                                      struct vmw_otable *otable)
 194 {
 195         struct {
 196                 SVGA3dCmdHeader header;
 197                 SVGA3dCmdSetOTableBase body;
 198         } *cmd;
 199         struct ttm_buffer_object *bo;
 200
 201         if (otable->page_table == NULL)
 202                 return;
 203
 204         bo = otable->page_table->pt_bo;
 205         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 206         if (unlikely(cmd == NULL)) {
 207                 DRM_ERROR("Failed reserving FIFO space for OTable "
 208                           "takedown.\n");
 209                 return;
 210         }
 211
 212         memset(cmd, 0, sizeof(*cmd));
 213         cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE;
 214         cmd->header.size = sizeof(cmd->body);
 215         cmd->body.type = type;
 216         cmd->body.baseAddress = 0;
 217         cmd->body.sizeInBytes = 0;
 218         cmd->body.validSizeInBytes = 0;
 219         cmd->body.ptDepth = SVGA3D_MOBFMT_INVALID;
 220         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 221
 222         if (bo) {
 223                 int ret;
 224
 225                 ret = ttm_bo_reserve(bo, false, true, NULL);
 226                 BUG_ON(ret != 0);
 227
 228                 vmw_fence_single_bo(bo, NULL);
 229                 ttm_bo_unreserve(bo);
 230         }
 231
 232         vmw_mob_destroy(otable->page_table);
 233         otable->page_table = NULL;
 234 }
 235
 236
 237 static int vmw_otable_batch_setup(struct vmw_private *dev_priv,
 238                                   struct vmw_otable_batch *batch)
 239 {
 240         unsigned long offset;
 241         unsigned long bo_size;
 242         struct vmw_otable *otables = batch->otables;
 243         SVGAOTableType i;
 244         int ret;
 245
 246         bo_size = 0;
 247         for (i = 0; i < batch->num_otables; ++i) {
 248                 if (!otables[i].enabled)
 249                         continue;
 250
 251                 otables[i].size =
 252                         (otables[i].size + PAGE_SIZE - 1) & PAGE_MASK;
 253                 bo_size += otables[i].size;
 254         }
 255
 256         ret = ttm_bo_create(&dev_priv->bdev, bo_size,
 257                             ttm_bo_type_device,
 258                             &vmw_sys_ne_placement,
 259                             0, false, NULL,
 260                             &batch->otable_bo);
 261
 262         if (unlikely(ret != 0))
 263                 goto out_no_bo;
 264
 265         ret = ttm_bo_reserve(batch->otable_bo, false, true, NULL);
 266         BUG_ON(ret != 0);
 267         ret = vmw_bo_driver.ttm_tt_populate(batch->otable_bo->ttm);
 268         if (unlikely(ret != 0))
 269                 goto out_unreserve;
 270         ret = vmw_bo_map_dma(batch->otable_bo);
 271         if (unlikely(ret != 0))
 272                 goto out_unreserve;
 273
 274         ttm_bo_unreserve(batch->otable_bo);
 275
 276         offset = 0;
 277         for (i = 0; i < batch->num_otables; ++i) {
 278                 if (!batch->otables[i].enabled)
 279                         continue;
 280
 281                 ret = vmw_setup_otable_base(dev_priv, i, batch->otable_bo,
 282                                             offset,
 283                                             &otables[i]);
 284                 if (unlikely(ret != 0))
 285                         goto out_no_setup;
 286                 offset += otables[i].size;
 287         }
 288
 289         return 0;
 290
 291 out_unreserve:
 292         ttm_bo_unreserve(batch->otable_bo);
 293 out_no_setup:
 294         for (i = 0; i < batch->num_otables; ++i) {
 295                 if (batch->otables[i].enabled)
 296                         vmw_takedown_otable_base(dev_priv, i,
 297                                                  &batch->otables[i]);
 298         }
 299
 300         ttm_bo_unref(&batch->otable_bo);
 301 out_no_bo:
 302         return ret;
 303 }
 304
 305 /*
 306  * vmw_otables_setup - Set up guest backed memory object tables
 307  *
 308  * @dev_priv:       Pointer to a device private structure
 309  *
 310  * Takes care of the device guest backed surface
 311  * initialization, by setting up the guest backed memory object tables.
 312  * Returns 0 on success and various error codes on failure. A successful return
 313  * means the object tables can be taken down using the vmw_otables_takedown
 314  * function.
 315  */
 316 int vmw_otables_setup(struct vmw_private *dev_priv)
 317 {
 318         struct vmw_otable **otables = &dev_priv->otable_batch.otables;
 319         int ret;
 320
 321         if (dev_priv->has_dx) {
 322                 *otables = kmemdup(dx_tables, sizeof(dx_tables), GFP_KERNEL);
 323                 if (!(*otables))
 324                         return -ENOMEM;
 325
 326                 dev_priv->otable_batch.num_otables = ARRAY_SIZE(dx_tables);
 327         } else {
 328                 *otables = kmemdup(pre_dx_tables, sizeof(pre_dx_tables),
 329                                    GFP_KERNEL);
 330                 if (!(*otables))
 331                         return -ENOMEM;
 332
 333                 dev_priv->otable_batch.num_otables = ARRAY_SIZE(pre_dx_tables);
 334         }
 335
 336         ret = vmw_otable_batch_setup(dev_priv, &dev_priv->otable_batch);
 337         if (unlikely(ret != 0))
 338                 goto out_setup;
 339
 340         return 0;
 341
 342 out_setup:
 343         kfree(*otables);
 344         return ret;
 345 }
 346
 347 static void vmw_otable_batch_takedown(struct vmw_private *dev_priv,
 348                                struct vmw_otable_batch *batch)
 349 {
 350         SVGAOTableType i;
 351         struct ttm_buffer_object *bo = batch->otable_bo;
 352         int ret;
 353
 354         for (i = 0; i < batch->num_otables; ++i)
 355                 if (batch->otables[i].enabled)
 356                         vmw_takedown_otable_base(dev_priv, i,
 357                                                  &batch->otables[i]);
 358
 359         ret = ttm_bo_reserve(bo, false, true, NULL);
 360         BUG_ON(ret != 0);
 361
 362         vmw_fence_single_bo(bo, NULL);
 363         ttm_bo_unreserve(bo);
 364
 365         ttm_bo_unref(&batch->otable_bo);
 366 }
 367
 368 /*
 369  * vmw_otables_takedown - Take down guest backed memory object tables
 370  *
 371  * @dev_priv:       Pointer to a device private structure
 372  *
 373  * Take down the Guest Memory Object tables.
 374  */
 375 void vmw_otables_takedown(struct vmw_private *dev_priv)
 376 {
 377         vmw_otable_batch_takedown(dev_priv, &dev_priv->otable_batch);
 378         kfree(dev_priv->otable_batch.otables);
 379 }
 380
 381 /*
 382  * vmw_mob_calculate_pt_pages - Calculate the number of page table pages
 383  * needed for a guest backed memory object.
 384  *
 385  * @data_pages:  Number of data pages in the memory object buffer.
 386  */
 387 static unsigned long vmw_mob_calculate_pt_pages(unsigned long data_pages)
 388 {
 389         unsigned long data_size = data_pages * PAGE_SIZE;
 390         unsigned long tot_size = 0;
 391
 392         while (likely(data_size > PAGE_SIZE)) {
 393                 data_size = DIV_ROUND_UP(data_size, PAGE_SIZE);
 394                 data_size *= VMW_PPN_SIZE;
 395                 tot_size += (data_size + PAGE_SIZE - 1) & PAGE_MASK;
 396         }
 397
 398         return tot_size >> PAGE_SHIFT;
 399 }
 400
 401 /*
 402  * vmw_mob_create - Create a mob, but don't populate it.
 403  *
 404  * @data_pages:  Number of data pages of the underlying buffer object.
 405  */
 406 struct vmw_mob *vmw_mob_create(unsigned long data_pages)
 407 {
 408         struct vmw_mob *mob = kzalloc(sizeof(*mob), GFP_KERNEL);
 409
 410         if (unlikely(!mob))
 411                 return NULL;
 412
 413         mob->num_pages = vmw_mob_calculate_pt_pages(data_pages);
 414
 415         return mob;
 416 }
 417
 418 /*
 419  * vmw_mob_pt_populate - Populate the mob pagetable
 420  *
 421  * @mob:         Pointer to the mob the pagetable of which we want to
 422  *               populate.
 423  *
 424  * This function allocates memory to be used for the pagetable, and
 425  * adjusts TTM memory accounting accordingly. Returns ENOMEM if
 426  * memory resources aren't sufficient and may cause TTM buffer objects
 427  * to be swapped out by using the TTM memory accounting function.
 428  */
 429 static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
 430                                struct vmw_mob *mob)
 431 {
 432         int ret;
 433         BUG_ON(mob->pt_bo != NULL);
 434
 435         ret = ttm_bo_create(&dev_priv->bdev, mob->num_pages * PAGE_SIZE,
 436                             ttm_bo_type_device,
 437                             &vmw_sys_ne_placement,
 438                             0, false, NULL, &mob->pt_bo);
 439         if (unlikely(ret != 0))
 440                 return ret;
 441
 442         ret = ttm_bo_reserve(mob->pt_bo, false, true, NULL);
 443
 444         BUG_ON(ret != 0);
 445         ret = vmw_bo_driver.ttm_tt_populate(mob->pt_bo->ttm);
 446         if (unlikely(ret != 0))
 447                 goto out_unreserve;
 448         ret = vmw_bo_map_dma(mob->pt_bo);
 449         if (unlikely(ret != 0))
 450                 goto out_unreserve;
 451
 452         ttm_bo_unreserve(mob->pt_bo);
 453
 454         return 0;
 455
 456 out_unreserve:
 457         ttm_bo_unreserve(mob->pt_bo);
 458         ttm_bo_unref(&mob->pt_bo);
 459
 460         return ret;
 461 }
 462
 463 /**
 464  * vmw_mob_assign_ppn - Assign a value to a page table entry
 465  *
 466  * @addr: Pointer to pointer to page table entry.
 467  * @val: The page table entry
 468  *
 469  * Assigns a value to a page table entry pointed to by *@addr and increments
 470  * *@addr according to the page table entry size.
 471  */
 472 #if (VMW_PPN_SIZE == 8)
 473 static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
 474 {
 475         *((u64 *) *addr) = val >> PAGE_SHIFT;
 476         *addr += 2;
 477 }
 478 #else
 479 static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
 480 {
 481         *(*addr)++ = val >> PAGE_SHIFT;
 482 }
 483 #endif
 484
 485 /*
 486  * vmw_mob_build_pt - Build a pagetable
 487  *
 488  * @data_addr:      Array of DMA addresses to the underlying buffer
 489  *                  object's data pages.
 490  * @num_data_pages: Number of buffer object data pages.
 491  * @pt_pages:       Array of page pointers to the page table pages.
 492  *
 493  * Returns the number of page table pages actually used.
 494  * Uses atomic kmaps of highmem pages to avoid TLB thrashing.
 495  */
 496 static unsigned long vmw_mob_build_pt(struct vmw_piter *data_iter,
 497                                       unsigned long num_data_pages,
 498                                       struct vmw_piter *pt_iter)
 499 {
 500         unsigned long pt_size = num_data_pages * VMW_PPN_SIZE;
 501         unsigned long num_pt_pages = DIV_ROUND_UP(pt_size, PAGE_SIZE);
 502         unsigned long pt_page;
 503         u32 *addr, *save_addr;
 504         unsigned long i;
 505         struct page *page;
 506
 507         for (pt_page = 0; pt_page < num_pt_pages; ++pt_page) {
 508                 page = vmw_piter_page(pt_iter);
 509
 510                 save_addr = addr = kmap_atomic(page);
 511
 512                 for (i = 0; i < PAGE_SIZE / VMW_PPN_SIZE; ++i) {
 513                         vmw_mob_assign_ppn(&addr,
 514                                            vmw_piter_dma_addr(data_iter));
 515                         if (unlikely(--num_data_pages == 0))
 516                                 break;
 517                         WARN_ON(!vmw_piter_next(data_iter));
 518                 }
 519                 kunmap_atomic(save_addr);
 520                 vmw_piter_next(pt_iter);
 521         }
 522
 523         return num_pt_pages;
 524 }
 525
 526 /*
 527  * vmw_mob_build_pt - Set up a multilevel mob pagetable
 528  *
 529  * @mob:            Pointer to a mob whose page table needs setting up.
 530  * @data_addr       Array of DMA addresses to the buffer object's data
 531  *                  pages.
 532  * @num_data_pages: Number of buffer object data pages.
 533  *
 534  * Uses tail recursion to set up a multilevel mob page table.
 535  */
 536 static void vmw_mob_pt_setup(struct vmw_mob *mob,
 537                              struct vmw_piter data_iter,
 538                              unsigned long num_data_pages)
 539 {
 540         unsigned long num_pt_pages = 0;
 541         struct ttm_buffer_object *bo = mob->pt_bo;
 542         struct vmw_piter save_pt_iter;
 543         struct vmw_piter pt_iter;
 544         const struct vmw_sg_table *vsgt;
 545         int ret;
 546
 547         ret = ttm_bo_reserve(bo, false, true, NULL);
 548         BUG_ON(ret != 0);
 549
 550         vsgt = vmw_bo_sg_table(bo);
 551         vmw_piter_start(&pt_iter, vsgt, 0);
 552         BUG_ON(!vmw_piter_next(&pt_iter));
 553         mob->pt_level = 0;
 554         while (likely(num_data_pages > 1)) {
 555                 ++mob->pt_level;
 556                 BUG_ON(mob->pt_level > 2);
 557                 save_pt_iter = pt_iter;
 558                 num_pt_pages = vmw_mob_build_pt(&data_iter, num_data_pages,
 559                                                 &pt_iter);
 560                 data_iter = save_pt_iter;
 561                 num_data_pages = num_pt_pages;
 562         }
 563
 564         mob->pt_root_page = vmw_piter_dma_addr(&save_pt_iter);
 565         ttm_bo_unreserve(bo);
 566 }
 567
 568 /*
 569  * vmw_mob_destroy - Destroy a mob, unpopulating first if necessary.
 570  *
 571  * @mob:            Pointer to a mob to destroy.
 572  */
 573 void vmw_mob_destroy(struct vmw_mob *mob)
 574 {
 575         if (mob->pt_bo)
 576                 ttm_bo_unref(&mob->pt_bo);
 577         kfree(mob);
 578 }
 579
 580 /*
 581  * vmw_mob_unbind - Hide a mob from the device.
 582  *
 583  * @dev_priv:       Pointer to a device private.
 584  * @mob_id:         Device id of the mob to unbind.
 585  */
 586 void vmw_mob_unbind(struct vmw_private *dev_priv,
 587                     struct vmw_mob *mob)
 588 {
 589         struct {
 590                 SVGA3dCmdHeader header;
 591                 SVGA3dCmdDestroyGBMob body;
 592         } *cmd;
 593         int ret;
 594         struct ttm_buffer_object *bo = mob->pt_bo;
 595
 596         if (bo) {
 597                 ret = ttm_bo_reserve(bo, false, true, NULL);
 598                 /*
 599                  * Noone else should be using this buffer.
 600                  */
 601                 BUG_ON(ret != 0);
 602         }
 603
 604         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 605         if (unlikely(cmd == NULL)) {
 606                 DRM_ERROR("Failed reserving FIFO space for Memory "
 607                           "Object unbinding.\n");
 608         } else {
 609                 cmd->header.id = SVGA_3D_CMD_DESTROY_GB_MOB;
 610                 cmd->header.size = sizeof(cmd->body);
 611                 cmd->body.mobid = mob->id;
 612                 vmw_fifo_commit(dev_priv, sizeof(*cmd));
 613         }
 614         if (bo) {
 615                 vmw_fence_single_bo(bo, NULL);
 616                 ttm_bo_unreserve(bo);
 617         }
 618         vmw_fifo_resource_dec(dev_priv);
 619 }
 620
 621 /*
 622  * vmw_mob_bind - Make a mob visible to the device after first
 623  *                populating it if necessary.
 624  *
 625  * @dev_priv:       Pointer to a device private.
 626  * @mob:            Pointer to the mob we're making visible.
 627  * @data_addr:      Array of DMA addresses to the data pages of the underlying
 628  *                  buffer object.
 629  * @num_data_pages: Number of data pages of the underlying buffer
 630  *                  object.
 631  * @mob_id:         Device id of the mob to bind
 632  *
 633  * This function is intended to be interfaced with the ttm_tt backend
 634  * code.
 635  */
 636 int vmw_mob_bind(struct vmw_private *dev_priv,
 637                  struct vmw_mob *mob,
 638                  const struct vmw_sg_table *vsgt,
 639                  unsigned long num_data_pages,
 640                  int32_t mob_id)
 641 {
 642         int ret;
 643         bool pt_set_up = false;
 644         struct vmw_piter data_iter;
 645         struct {
 646                 SVGA3dCmdHeader header;
 647                 SVGA3dCmdDefineGBMob64 body;
 648         } *cmd;
 649
 650         mob->id = mob_id;
 651         vmw_piter_start(&data_iter, vsgt, 0);
 652         if (unlikely(!vmw_piter_next(&data_iter)))
 653                 return 0;
 654
 655         if (likely(num_data_pages == 1)) {
 656                 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
 657                 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
 658         } else if (vsgt->num_regions == 1) {
 659                 mob->pt_level = SVGA3D_MOBFMT_RANGE;
 660                 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
 661         } else if (unlikely(mob->pt_bo == NULL)) {
 662                 ret = vmw_mob_pt_populate(dev_priv, mob);
 663                 if (unlikely(ret != 0))
 664                         return ret;
 665
 666                 vmw_mob_pt_setup(mob, data_iter, num_data_pages);
 667                 pt_set_up = true;
 668                 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1;
 669         }
 670
 671         vmw_fifo_resource_inc(dev_priv);
 672
 673         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 674         if (unlikely(cmd == NULL)) {
 675                 DRM_ERROR("Failed reserving FIFO space for Memory "
 676                           "Object binding.\n");
 677                 goto out_no_cmd_space;
 678         }
 679
 680         cmd->header.id = SVGA_3D_CMD_DEFINE_GB_MOB64;
 681         cmd->header.size = sizeof(cmd->body);
 682         cmd->body.mobid = mob_id;
 683         cmd->body.ptDepth = mob->pt_level;
 684         cmd->body.base = mob->pt_root_page >> PAGE_SHIFT;
 685         cmd->body.sizeInBytes = num_data_pages * PAGE_SIZE;
 686
 687         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 688
 689         return 0;
 690
 691 out_no_cmd_space:
 692         vmw_fifo_resource_dec(dev_priv);
 693         if (pt_set_up)
 694                 ttm_bo_unref(&mob->pt_bo);
 695
 696         return -ENOMEM;
 697 }