1 // SPDX-License-Identifier: GPL-2.0 OR MIT 2 /************************************************************************** 3 * 4 * Copyright 2012-2015 VMware, Inc., Palo Alto, CA., USA 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 24 * USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 28 #include <linux/highmem.h> 29 30 #include "vmwgfx_drv.h" 31 32 /* 33 * If we set up the screen target otable, screen objects stop working. 34 */ 35 36 #define VMW_OTABLE_SETUP_SUB ((VMWGFX_ENABLE_SCREEN_TARGET_OTABLE ? 0 : 1)) 37 38 #ifdef CONFIG_64BIT 39 #define VMW_PPN_SIZE 8 40 #define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PTDEPTH64_0 41 #define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PTDEPTH64_1 42 #define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PTDEPTH64_2 43 #else 44 #define VMW_PPN_SIZE 4 45 #define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PTDEPTH_0 46 #define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PTDEPTH_1 47 #define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PTDEPTH_2 48 #endif 49 50 /* 51 * struct vmw_mob - Structure containing page table and metadata for a 52 * Guest Memory OBject. 53 * 54 * @num_pages Number of pages that make up the page table. 55 * @pt_level The indirection level of the page table. 0-2. 56 * @pt_root_page DMA address of the level 0 page of the page table. 57 */ 58 struct vmw_mob { 59 struct ttm_buffer_object *pt_bo; 60 unsigned long num_pages; 61 unsigned pt_level; 62 dma_addr_t pt_root_page; 63 uint32_t id; 64 }; 65 66 /* 67 * struct vmw_otable - Guest Memory OBject table metadata 68 * 69 * @size: Size of the table (page-aligned). 70 * @page_table: Pointer to a struct vmw_mob holding the page table. 71 */ 72 static const struct vmw_otable pre_dx_tables[] = { 73 {VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE, NULL, true}, 74 {VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE, NULL, true}, 75 {VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE, NULL, true}, 76 {VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE, NULL, true}, 77 {VMWGFX_NUM_GB_SCREEN_TARGET * SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE, 78 NULL, VMWGFX_ENABLE_SCREEN_TARGET_OTABLE} 79 }; 80 81 static const struct vmw_otable dx_tables[] = { 82 {VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE, NULL, true}, 83 {VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE, NULL, true}, 84 {VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE, NULL, true}, 85 {VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE, NULL, true}, 86 {VMWGFX_NUM_GB_SCREEN_TARGET * SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE, 87 NULL, VMWGFX_ENABLE_SCREEN_TARGET_OTABLE}, 88 {VMWGFX_NUM_DXCONTEXT * sizeof(SVGAOTableDXContextEntry), NULL, true}, 89 }; 90 91 static int vmw_mob_pt_populate(struct vmw_private *dev_priv, 92 struct vmw_mob *mob); 93 static void vmw_mob_pt_setup(struct vmw_mob *mob, 94 struct vmw_piter data_iter, 95 unsigned long num_data_pages); 96 97 /* 98 * vmw_setup_otable_base - Issue an object table base setup command to 99 * the device 100 * 101 * @dev_priv: Pointer to a device private structure 102 * @type: Type of object table base 103 * @offset Start of table offset into dev_priv::otable_bo 104 * @otable Pointer to otable metadata; 105 * 106 * This function returns -ENOMEM if it fails to reserve fifo space, 107 * and may block waiting for fifo space. 108 */ 109 static int vmw_setup_otable_base(struct vmw_private *dev_priv, 110 SVGAOTableType type, 111 struct ttm_buffer_object *otable_bo, 112 unsigned long offset, 113 struct vmw_otable *otable) 114 { 115 struct { 116 SVGA3dCmdHeader header; 117 SVGA3dCmdSetOTableBase64 body; 118 } *cmd; 119 struct vmw_mob *mob; 120 const struct vmw_sg_table *vsgt; 121 struct vmw_piter iter; 122 int ret; 123 124 BUG_ON(otable->page_table != NULL); 125 126 vsgt = vmw_bo_sg_table(otable_bo); 127 vmw_piter_start(&iter, vsgt, offset >> PAGE_SHIFT); 128 WARN_ON(!vmw_piter_next(&iter)); 129 130 mob = vmw_mob_create(otable->size >> PAGE_SHIFT); 131 if (unlikely(mob == NULL)) { 132 DRM_ERROR("Failed creating OTable page table.\n"); 133 return -ENOMEM; 134 } 135 136 if (otable->size <= PAGE_SIZE) { 137 mob->pt_level = VMW_MOBFMT_PTDEPTH_0; 138 mob->pt_root_page = vmw_piter_dma_addr(&iter); 139 } else if (vsgt->num_regions == 1) { 140 mob->pt_level = SVGA3D_MOBFMT_RANGE; 141 mob->pt_root_page = vmw_piter_dma_addr(&iter); 142 } else { 143 ret = vmw_mob_pt_populate(dev_priv, mob); 144 if (unlikely(ret != 0)) 145 goto out_no_populate; 146 147 vmw_mob_pt_setup(mob, iter, otable->size >> PAGE_SHIFT); 148 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1; 149 } 150 151 cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd)); 152 if (unlikely(cmd == NULL)) { 153 ret = -ENOMEM; 154 goto out_no_fifo; 155 } 156 157 memset(cmd, 0, sizeof(*cmd)); 158 cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE64; 159 cmd->header.size = sizeof(cmd->body); 160 cmd->body.type = type; 161 cmd->body.baseAddress = mob->pt_root_page >> PAGE_SHIFT; 162 cmd->body.sizeInBytes = otable->size; 163 cmd->body.validSizeInBytes = 0; 164 cmd->body.ptDepth = mob->pt_level; 165 166 /* 167 * The device doesn't support this, But the otable size is 168 * determined at compile-time, so this BUG shouldn't trigger 169 * randomly. 170 */ 171 BUG_ON(mob->pt_level == VMW_MOBFMT_PTDEPTH_2); 172 173 vmw_fifo_commit(dev_priv, sizeof(*cmd)); 174 otable->page_table = mob; 175 176 return 0; 177 178 out_no_fifo: 179 out_no_populate: 180 vmw_mob_destroy(mob); 181 return ret; 182 } 183 184 /* 185 * vmw_takedown_otable_base - Issue an object table base takedown command 186 * to the device 187 * 188 * @dev_priv: Pointer to a device private structure 189 * @type: Type of object table base 190 * 191 */ 192 static void vmw_takedown_otable_base(struct vmw_private *dev_priv, 193 SVGAOTableType type, 194 struct vmw_otable *otable) 195 { 196 struct { 197 SVGA3dCmdHeader header; 198 SVGA3dCmdSetOTableBase body; 199 } *cmd; 200 struct ttm_buffer_object *bo; 201 202 if (otable->page_table == NULL) 203 return; 204 205 bo = otable->page_table->pt_bo; 206 cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd)); 207 if (unlikely(cmd == NULL)) 208 return; 209 210 memset(cmd, 0, sizeof(*cmd)); 211 cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE; 212 cmd->header.size = sizeof(cmd->body); 213 cmd->body.type = type; 214 cmd->body.baseAddress = 0; 215 cmd->body.sizeInBytes = 0; 216 cmd->body.validSizeInBytes = 0; 217 cmd->body.ptDepth = SVGA3D_MOBFMT_INVALID; 218 vmw_fifo_commit(dev_priv, sizeof(*cmd)); 219 220 if (bo) { 221 int ret; 222 223 ret = ttm_bo_reserve(bo, false, true, NULL); 224 BUG_ON(ret != 0); 225 226 vmw_bo_fence_single(bo, NULL); 227 ttm_bo_unreserve(bo); 228 } 229 230 vmw_mob_destroy(otable->page_table); 231 otable->page_table = NULL; 232 } 233 234 235 static int vmw_otable_batch_setup(struct vmw_private *dev_priv, 236 struct vmw_otable_batch *batch) 237 { 238 unsigned long offset; 239 unsigned long bo_size; 240 struct vmw_otable *otables = batch->otables; 241 struct ttm_operation_ctx ctx = { 242 .interruptible = false, 243 .no_wait_gpu = false 244 }; 245 SVGAOTableType i; 246 int ret; 247 248 bo_size = 0; 249 for (i = 0; i < batch->num_otables; ++i) { 250 if (!otables[i].enabled) 251 continue; 252 253 otables[i].size = 254 (otables[i].size + PAGE_SIZE - 1) & PAGE_MASK; 255 bo_size += otables[i].size; 256 } 257 258 ret = ttm_bo_create(&dev_priv->bdev, bo_size, 259 ttm_bo_type_device, 260 &vmw_sys_ne_placement, 261 0, false, &batch->otable_bo); 262 263 if (unlikely(ret != 0)) 264 goto out_no_bo; 265 266 ret = ttm_bo_reserve(batch->otable_bo, false, true, NULL); 267 BUG_ON(ret != 0); 268 ret = vmw_bo_driver.ttm_tt_populate(batch->otable_bo->ttm, &ctx); 269 if (unlikely(ret != 0)) 270 goto out_unreserve; 271 ret = vmw_bo_map_dma(batch->otable_bo); 272 if (unlikely(ret != 0)) 273 goto out_unreserve; 274 275 ttm_bo_unreserve(batch->otable_bo); 276 277 offset = 0; 278 for (i = 0; i < batch->num_otables; ++i) { 279 if (!batch->otables[i].enabled) 280 continue; 281 282 ret = vmw_setup_otable_base(dev_priv, i, batch->otable_bo, 283 offset, 284 &otables[i]); 285 if (unlikely(ret != 0)) 286 goto out_no_setup; 287 offset += otables[i].size; 288 } 289 290 return 0; 291 292 out_unreserve: 293 ttm_bo_unreserve(batch->otable_bo); 294 out_no_setup: 295 for (i = 0; i < batch->num_otables; ++i) { 296 if (batch->otables[i].enabled) 297 vmw_takedown_otable_base(dev_priv, i, 298 &batch->otables[i]); 299 } 300 301 ttm_bo_put(batch->otable_bo); 302 batch->otable_bo = NULL; 303 out_no_bo: 304 return ret; 305 } 306 307 /* 308 * vmw_otables_setup - Set up guest backed memory object tables 309 * 310 * @dev_priv: Pointer to a device private structure 311 * 312 * Takes care of the device guest backed surface 313 * initialization, by setting up the guest backed memory object tables. 314 * Returns 0 on success and various error codes on failure. A successful return 315 * means the object tables can be taken down using the vmw_otables_takedown 316 * function. 317 */ 318 int vmw_otables_setup(struct vmw_private *dev_priv) 319 { 320 struct vmw_otable **otables = &dev_priv->otable_batch.otables; 321 int ret; 322 323 if (dev_priv->has_dx) { 324 *otables = kmemdup(dx_tables, sizeof(dx_tables), GFP_KERNEL); 325 if (!(*otables)) 326 return -ENOMEM; 327 328 dev_priv->otable_batch.num_otables = ARRAY_SIZE(dx_tables); 329 } else { 330 *otables = kmemdup(pre_dx_tables, sizeof(pre_dx_tables), 331 GFP_KERNEL); 332 if (!(*otables)) 333 return -ENOMEM; 334 335 dev_priv->otable_batch.num_otables = ARRAY_SIZE(pre_dx_tables); 336 } 337 338 ret = vmw_otable_batch_setup(dev_priv, &dev_priv->otable_batch); 339 if (unlikely(ret != 0)) 340 goto out_setup; 341 342 return 0; 343 344 out_setup: 345 kfree(*otables); 346 return ret; 347 } 348 349 static void vmw_otable_batch_takedown(struct vmw_private *dev_priv, 350 struct vmw_otable_batch *batch) 351 { 352 SVGAOTableType i; 353 struct ttm_buffer_object *bo = batch->otable_bo; 354 int ret; 355 356 for (i = 0; i < batch->num_otables; ++i) 357 if (batch->otables[i].enabled) 358 vmw_takedown_otable_base(dev_priv, i, 359 &batch->otables[i]); 360 361 ret = ttm_bo_reserve(bo, false, true, NULL); 362 BUG_ON(ret != 0); 363 364 vmw_bo_fence_single(bo, NULL); 365 ttm_bo_unreserve(bo); 366 367 ttm_bo_put(batch->otable_bo); 368 batch->otable_bo = NULL; 369 } 370 371 /* 372 * vmw_otables_takedown - Take down guest backed memory object tables 373 * 374 * @dev_priv: Pointer to a device private structure 375 * 376 * Take down the Guest Memory Object tables. 377 */ 378 void vmw_otables_takedown(struct vmw_private *dev_priv) 379 { 380 vmw_otable_batch_takedown(dev_priv, &dev_priv->otable_batch); 381 kfree(dev_priv->otable_batch.otables); 382 } 383 384 /* 385 * vmw_mob_calculate_pt_pages - Calculate the number of page table pages 386 * needed for a guest backed memory object. 387 * 388 * @data_pages: Number of data pages in the memory object buffer. 389 */ 390 static unsigned long vmw_mob_calculate_pt_pages(unsigned long data_pages) 391 { 392 unsigned long data_size = data_pages * PAGE_SIZE; 393 unsigned long tot_size = 0; 394 395 while (likely(data_size > PAGE_SIZE)) { 396 data_size = DIV_ROUND_UP(data_size, PAGE_SIZE); 397 data_size *= VMW_PPN_SIZE; 398 tot_size += (data_size + PAGE_SIZE - 1) & PAGE_MASK; 399 } 400 401 return tot_size >> PAGE_SHIFT; 402 } 403 404 /* 405 * vmw_mob_create - Create a mob, but don't populate it. 406 * 407 * @data_pages: Number of data pages of the underlying buffer object. 408 */ 409 struct vmw_mob *vmw_mob_create(unsigned long data_pages) 410 { 411 struct vmw_mob *mob = kzalloc(sizeof(*mob), GFP_KERNEL); 412 413 if (unlikely(!mob)) 414 return NULL; 415 416 mob->num_pages = vmw_mob_calculate_pt_pages(data_pages); 417 418 return mob; 419 } 420 421 /* 422 * vmw_mob_pt_populate - Populate the mob pagetable 423 * 424 * @mob: Pointer to the mob the pagetable of which we want to 425 * populate. 426 * 427 * This function allocates memory to be used for the pagetable, and 428 * adjusts TTM memory accounting accordingly. Returns ENOMEM if 429 * memory resources aren't sufficient and may cause TTM buffer objects 430 * to be swapped out by using the TTM memory accounting function. 431 */ 432 static int vmw_mob_pt_populate(struct vmw_private *dev_priv, 433 struct vmw_mob *mob) 434 { 435 int ret; 436 struct ttm_operation_ctx ctx = { 437 .interruptible = false, 438 .no_wait_gpu = false 439 }; 440 441 BUG_ON(mob->pt_bo != NULL); 442 443 ret = ttm_bo_create(&dev_priv->bdev, mob->num_pages * PAGE_SIZE, 444 ttm_bo_type_device, 445 &vmw_sys_ne_placement, 446 0, false, &mob->pt_bo); 447 if (unlikely(ret != 0)) 448 return ret; 449 450 ret = ttm_bo_reserve(mob->pt_bo, false, true, NULL); 451 452 BUG_ON(ret != 0); 453 ret = vmw_bo_driver.ttm_tt_populate(mob->pt_bo->ttm, &ctx); 454 if (unlikely(ret != 0)) 455 goto out_unreserve; 456 ret = vmw_bo_map_dma(mob->pt_bo); 457 if (unlikely(ret != 0)) 458 goto out_unreserve; 459 460 ttm_bo_unreserve(mob->pt_bo); 461 462 return 0; 463 464 out_unreserve: 465 ttm_bo_unreserve(mob->pt_bo); 466 ttm_bo_put(mob->pt_bo); 467 mob->pt_bo = NULL; 468 469 return ret; 470 } 471 472 /** 473 * vmw_mob_assign_ppn - Assign a value to a page table entry 474 * 475 * @addr: Pointer to pointer to page table entry. 476 * @val: The page table entry 477 * 478 * Assigns a value to a page table entry pointed to by *@addr and increments 479 * *@addr according to the page table entry size. 480 */ 481 #if (VMW_PPN_SIZE == 8) 482 static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val) 483 { 484 *((u64 *) *addr) = val >> PAGE_SHIFT; 485 *addr += 2; 486 } 487 #else 488 static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val) 489 { 490 *(*addr)++ = val >> PAGE_SHIFT; 491 } 492 #endif 493 494 /* 495 * vmw_mob_build_pt - Build a pagetable 496 * 497 * @data_addr: Array of DMA addresses to the underlying buffer 498 * object's data pages. 499 * @num_data_pages: Number of buffer object data pages. 500 * @pt_pages: Array of page pointers to the page table pages. 501 * 502 * Returns the number of page table pages actually used. 503 * Uses atomic kmaps of highmem pages to avoid TLB thrashing. 504 */ 505 static unsigned long vmw_mob_build_pt(struct vmw_piter *data_iter, 506 unsigned long num_data_pages, 507 struct vmw_piter *pt_iter) 508 { 509 unsigned long pt_size = num_data_pages * VMW_PPN_SIZE; 510 unsigned long num_pt_pages = DIV_ROUND_UP(pt_size, PAGE_SIZE); 511 unsigned long pt_page; 512 u32 *addr, *save_addr; 513 unsigned long i; 514 struct page *page; 515 516 for (pt_page = 0; pt_page < num_pt_pages; ++pt_page) { 517 page = vmw_piter_page(pt_iter); 518 519 save_addr = addr = kmap_atomic(page); 520 521 for (i = 0; i < PAGE_SIZE / VMW_PPN_SIZE; ++i) { 522 vmw_mob_assign_ppn(&addr, 523 vmw_piter_dma_addr(data_iter)); 524 if (unlikely(--num_data_pages == 0)) 525 break; 526 WARN_ON(!vmw_piter_next(data_iter)); 527 } 528 kunmap_atomic(save_addr); 529 vmw_piter_next(pt_iter); 530 } 531 532 return num_pt_pages; 533 } 534 535 /* 536 * vmw_mob_build_pt - Set up a multilevel mob pagetable 537 * 538 * @mob: Pointer to a mob whose page table needs setting up. 539 * @data_addr Array of DMA addresses to the buffer object's data 540 * pages. 541 * @num_data_pages: Number of buffer object data pages. 542 * 543 * Uses tail recursion to set up a multilevel mob page table. 544 */ 545 static void vmw_mob_pt_setup(struct vmw_mob *mob, 546 struct vmw_piter data_iter, 547 unsigned long num_data_pages) 548 { 549 unsigned long num_pt_pages = 0; 550 struct ttm_buffer_object *bo = mob->pt_bo; 551 struct vmw_piter save_pt_iter; 552 struct vmw_piter pt_iter; 553 const struct vmw_sg_table *vsgt; 554 int ret; 555 556 ret = ttm_bo_reserve(bo, false, true, NULL); 557 BUG_ON(ret != 0); 558 559 vsgt = vmw_bo_sg_table(bo); 560 vmw_piter_start(&pt_iter, vsgt, 0); 561 BUG_ON(!vmw_piter_next(&pt_iter)); 562 mob->pt_level = 0; 563 while (likely(num_data_pages > 1)) { 564 ++mob->pt_level; 565 BUG_ON(mob->pt_level > 2); 566 save_pt_iter = pt_iter; 567 num_pt_pages = vmw_mob_build_pt(&data_iter, num_data_pages, 568 &pt_iter); 569 data_iter = save_pt_iter; 570 num_data_pages = num_pt_pages; 571 } 572 573 mob->pt_root_page = vmw_piter_dma_addr(&save_pt_iter); 574 ttm_bo_unreserve(bo); 575 } 576 577 /* 578 * vmw_mob_destroy - Destroy a mob, unpopulating first if necessary. 579 * 580 * @mob: Pointer to a mob to destroy. 581 */ 582 void vmw_mob_destroy(struct vmw_mob *mob) 583 { 584 if (mob->pt_bo) { 585 ttm_bo_put(mob->pt_bo); 586 mob->pt_bo = NULL; 587 } 588 kfree(mob); 589 } 590 591 /* 592 * vmw_mob_unbind - Hide a mob from the device. 593 * 594 * @dev_priv: Pointer to a device private. 595 * @mob_id: Device id of the mob to unbind. 596 */ 597 void vmw_mob_unbind(struct vmw_private *dev_priv, 598 struct vmw_mob *mob) 599 { 600 struct { 601 SVGA3dCmdHeader header; 602 SVGA3dCmdDestroyGBMob body; 603 } *cmd; 604 int ret; 605 struct ttm_buffer_object *bo = mob->pt_bo; 606 607 if (bo) { 608 ret = ttm_bo_reserve(bo, false, true, NULL); 609 /* 610 * Noone else should be using this buffer. 611 */ 612 BUG_ON(ret != 0); 613 } 614 615 cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd)); 616 if (cmd) { 617 cmd->header.id = SVGA_3D_CMD_DESTROY_GB_MOB; 618 cmd->header.size = sizeof(cmd->body); 619 cmd->body.mobid = mob->id; 620 vmw_fifo_commit(dev_priv, sizeof(*cmd)); 621 } 622 623 if (bo) { 624 vmw_bo_fence_single(bo, NULL); 625 ttm_bo_unreserve(bo); 626 } 627 vmw_fifo_resource_dec(dev_priv); 628 } 629 630 /* 631 * vmw_mob_bind - Make a mob visible to the device after first 632 * populating it if necessary. 633 * 634 * @dev_priv: Pointer to a device private. 635 * @mob: Pointer to the mob we're making visible. 636 * @data_addr: Array of DMA addresses to the data pages of the underlying 637 * buffer object. 638 * @num_data_pages: Number of data pages of the underlying buffer 639 * object. 640 * @mob_id: Device id of the mob to bind 641 * 642 * This function is intended to be interfaced with the ttm_tt backend 643 * code. 644 */ 645 int vmw_mob_bind(struct vmw_private *dev_priv, 646 struct vmw_mob *mob, 647 const struct vmw_sg_table *vsgt, 648 unsigned long num_data_pages, 649 int32_t mob_id) 650 { 651 int ret; 652 bool pt_set_up = false; 653 struct vmw_piter data_iter; 654 struct { 655 SVGA3dCmdHeader header; 656 SVGA3dCmdDefineGBMob64 body; 657 } *cmd; 658 659 mob->id = mob_id; 660 vmw_piter_start(&data_iter, vsgt, 0); 661 if (unlikely(!vmw_piter_next(&data_iter))) 662 return 0; 663 664 if (likely(num_data_pages == 1)) { 665 mob->pt_level = VMW_MOBFMT_PTDEPTH_0; 666 mob->pt_root_page = vmw_piter_dma_addr(&data_iter); 667 } else if (vsgt->num_regions == 1) { 668 mob->pt_level = SVGA3D_MOBFMT_RANGE; 669 mob->pt_root_page = vmw_piter_dma_addr(&data_iter); 670 } else if (unlikely(mob->pt_bo == NULL)) { 671 ret = vmw_mob_pt_populate(dev_priv, mob); 672 if (unlikely(ret != 0)) 673 return ret; 674 675 vmw_mob_pt_setup(mob, data_iter, num_data_pages); 676 pt_set_up = true; 677 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1; 678 } 679 680 vmw_fifo_resource_inc(dev_priv); 681 682 cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd)); 683 if (unlikely(cmd == NULL)) 684 goto out_no_cmd_space; 685 686 cmd->header.id = SVGA_3D_CMD_DEFINE_GB_MOB64; 687 cmd->header.size = sizeof(cmd->body); 688 cmd->body.mobid = mob_id; 689 cmd->body.ptDepth = mob->pt_level; 690 cmd->body.base = mob->pt_root_page >> PAGE_SHIFT; 691 cmd->body.sizeInBytes = num_data_pages * PAGE_SIZE; 692 693 vmw_fifo_commit(dev_priv, sizeof(*cmd)); 694 695 return 0; 696 697 out_no_cmd_space: 698 vmw_fifo_resource_dec(dev_priv); 699 if (pt_set_up) { 700 ttm_bo_put(mob->pt_bo); 701 mob->pt_bo = NULL; 702 } 703 704 return -ENOMEM; 705 } 706