1 /* 2 * SPDX-License-Identifier: MIT 3 * 4 * Copyright © 2008-2012 Intel Corporation 5 */ 6 7 #include <linux/errno.h> 8 #include <linux/mutex.h> 9 10 #include <drm/drm_mm.h> 11 #include <drm/i915_drm.h> 12 13 #include "gem/i915_gem_region.h" 14 #include "i915_drv.h" 15 #include "i915_gem_stolen.h" 16 17 /* 18 * The BIOS typically reserves some of the system's memory for the exclusive 19 * use of the integrated graphics. This memory is no longer available for 20 * use by the OS and so the user finds that his system has less memory 21 * available than he put in. We refer to this memory as stolen. 22 * 23 * The BIOS will allocate its framebuffer from the stolen memory. Our 24 * goal is try to reuse that object for our own fbcon which must always 25 * be available for panics. Anything else we can reuse the stolen memory 26 * for is a boon. 27 */ 28 29 int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *i915, 30 struct drm_mm_node *node, u64 size, 31 unsigned alignment, u64 start, u64 end) 32 { 33 int ret; 34 35 if (!drm_mm_initialized(&i915->mm.stolen)) 36 return -ENODEV; 37 38 /* WaSkipStolenMemoryFirstPage:bdw+ */ 39 if (INTEL_GEN(i915) >= 8 && start < 4096) 40 start = 4096; 41 42 mutex_lock(&i915->mm.stolen_lock); 43 ret = drm_mm_insert_node_in_range(&i915->mm.stolen, node, 44 size, alignment, 0, 45 start, end, DRM_MM_INSERT_BEST); 46 mutex_unlock(&i915->mm.stolen_lock); 47 48 return ret; 49 } 50 51 int i915_gem_stolen_insert_node(struct drm_i915_private *i915, 52 struct drm_mm_node *node, u64 size, 53 unsigned alignment) 54 { 55 return i915_gem_stolen_insert_node_in_range(i915, node, size, 56 alignment, 0, U64_MAX); 57 } 58 59 void i915_gem_stolen_remove_node(struct drm_i915_private *i915, 60 struct drm_mm_node *node) 61 { 62 mutex_lock(&i915->mm.stolen_lock); 63 drm_mm_remove_node(node); 64 mutex_unlock(&i915->mm.stolen_lock); 65 } 66 67 static int i915_adjust_stolen(struct drm_i915_private *i915, 68 struct resource *dsm) 69 { 70 struct i915_ggtt *ggtt = &i915->ggtt; 71 struct intel_uncore *uncore = ggtt->vm.gt->uncore; 72 struct resource *r; 73 74 if (dsm->start == 0 || dsm->end <= dsm->start) 75 return -EINVAL; 76 77 /* 78 * TODO: We have yet too encounter the case where the GTT wasn't at the 79 * end of stolen. With that assumption we could simplify this. 80 */ 81 82 /* Make sure we don't clobber the GTT if it's within stolen memory */ 83 if (INTEL_GEN(i915) <= 4 && 84 !IS_G33(i915) && !IS_PINEVIEW(i915) && !IS_G4X(i915)) { 85 struct resource stolen[2] = {*dsm, *dsm}; 86 struct resource ggtt_res; 87 resource_size_t ggtt_start; 88 89 ggtt_start = intel_uncore_read(uncore, PGTBL_CTL); 90 if (IS_GEN(i915, 4)) 91 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) | 92 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28; 93 else 94 ggtt_start &= PGTBL_ADDRESS_LO_MASK; 95 96 ggtt_res = 97 (struct resource) DEFINE_RES_MEM(ggtt_start, 98 ggtt_total_entries(ggtt) * 4); 99 100 if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end) 101 stolen[0].end = ggtt_res.start; 102 if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end) 103 stolen[1].start = ggtt_res.end; 104 105 /* Pick the larger of the two chunks */ 106 if (resource_size(&stolen[0]) > resource_size(&stolen[1])) 107 *dsm = stolen[0]; 108 else 109 *dsm = stolen[1]; 110 111 if (stolen[0].start != stolen[1].start || 112 stolen[0].end != stolen[1].end) { 113 drm_dbg(&i915->drm, 114 "GTT within stolen memory at %pR\n", 115 &ggtt_res); 116 drm_dbg(&i915->drm, "Stolen memory adjusted to %pR\n", 117 dsm); 118 } 119 } 120 121 /* 122 * Verify that nothing else uses this physical address. Stolen 123 * memory should be reserved by the BIOS and hidden from the 124 * kernel. So if the region is already marked as busy, something 125 * is seriously wrong. 126 */ 127 r = devm_request_mem_region(i915->drm.dev, dsm->start, 128 resource_size(dsm), 129 "Graphics Stolen Memory"); 130 if (r == NULL) { 131 /* 132 * One more attempt but this time requesting region from 133 * start + 1, as we have seen that this resolves the region 134 * conflict with the PCI Bus. 135 * This is a BIOS w/a: Some BIOS wrap stolen in the root 136 * PCI bus, but have an off-by-one error. Hence retry the 137 * reservation starting from 1 instead of 0. 138 * There's also BIOS with off-by-one on the other end. 139 */ 140 r = devm_request_mem_region(i915->drm.dev, dsm->start + 1, 141 resource_size(dsm) - 2, 142 "Graphics Stolen Memory"); 143 /* 144 * GEN3 firmware likes to smash pci bridges into the stolen 145 * range. Apparently this works. 146 */ 147 if (!r && !IS_GEN(i915, 3)) { 148 drm_err(&i915->drm, 149 "conflict detected with stolen region: %pR\n", 150 dsm); 151 152 return -EBUSY; 153 } 154 } 155 156 return 0; 157 } 158 159 static void i915_gem_cleanup_stolen(struct drm_i915_private *i915) 160 { 161 if (!drm_mm_initialized(&i915->mm.stolen)) 162 return; 163 164 drm_mm_takedown(&i915->mm.stolen); 165 } 166 167 static void g4x_get_stolen_reserved(struct drm_i915_private *i915, 168 struct intel_uncore *uncore, 169 resource_size_t *base, 170 resource_size_t *size) 171 { 172 u32 reg_val = intel_uncore_read(uncore, 173 IS_GM45(i915) ? 174 CTG_STOLEN_RESERVED : 175 ELK_STOLEN_RESERVED); 176 resource_size_t stolen_top = i915->dsm.end + 1; 177 178 drm_dbg(&i915->drm, "%s_STOLEN_RESERVED = %08x\n", 179 IS_GM45(i915) ? "CTG" : "ELK", reg_val); 180 181 if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0) 182 return; 183 184 /* 185 * Whether ILK really reuses the ELK register for this is unclear. 186 * Let's see if we catch anyone with this supposedly enabled on ILK. 187 */ 188 drm_WARN(&i915->drm, IS_GEN(i915, 5), 189 "ILK stolen reserved found? 0x%08x\n", 190 reg_val); 191 192 if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK)) 193 return; 194 195 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16; 196 drm_WARN_ON(&i915->drm, 197 (reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base); 198 199 *size = stolen_top - *base; 200 } 201 202 static void gen6_get_stolen_reserved(struct drm_i915_private *i915, 203 struct intel_uncore *uncore, 204 resource_size_t *base, 205 resource_size_t *size) 206 { 207 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 208 209 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 210 211 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 212 return; 213 214 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 215 216 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) { 217 case GEN6_STOLEN_RESERVED_1M: 218 *size = 1024 * 1024; 219 break; 220 case GEN6_STOLEN_RESERVED_512K: 221 *size = 512 * 1024; 222 break; 223 case GEN6_STOLEN_RESERVED_256K: 224 *size = 256 * 1024; 225 break; 226 case GEN6_STOLEN_RESERVED_128K: 227 *size = 128 * 1024; 228 break; 229 default: 230 *size = 1024 * 1024; 231 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK); 232 } 233 } 234 235 static void vlv_get_stolen_reserved(struct drm_i915_private *i915, 236 struct intel_uncore *uncore, 237 resource_size_t *base, 238 resource_size_t *size) 239 { 240 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 241 resource_size_t stolen_top = i915->dsm.end + 1; 242 243 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 244 245 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 246 return; 247 248 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { 249 default: 250 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); 251 /* fall through */ 252 case GEN7_STOLEN_RESERVED_1M: 253 *size = 1024 * 1024; 254 break; 255 } 256 257 /* 258 * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the 259 * reserved location as (top - size). 260 */ 261 *base = stolen_top - *size; 262 } 263 264 static void gen7_get_stolen_reserved(struct drm_i915_private *i915, 265 struct intel_uncore *uncore, 266 resource_size_t *base, 267 resource_size_t *size) 268 { 269 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 270 271 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 272 273 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 274 return; 275 276 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK; 277 278 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { 279 case GEN7_STOLEN_RESERVED_1M: 280 *size = 1024 * 1024; 281 break; 282 case GEN7_STOLEN_RESERVED_256K: 283 *size = 256 * 1024; 284 break; 285 default: 286 *size = 1024 * 1024; 287 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); 288 } 289 } 290 291 static void chv_get_stolen_reserved(struct drm_i915_private *i915, 292 struct intel_uncore *uncore, 293 resource_size_t *base, 294 resource_size_t *size) 295 { 296 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 297 298 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 299 300 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 301 return; 302 303 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 304 305 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { 306 case GEN8_STOLEN_RESERVED_1M: 307 *size = 1024 * 1024; 308 break; 309 case GEN8_STOLEN_RESERVED_2M: 310 *size = 2 * 1024 * 1024; 311 break; 312 case GEN8_STOLEN_RESERVED_4M: 313 *size = 4 * 1024 * 1024; 314 break; 315 case GEN8_STOLEN_RESERVED_8M: 316 *size = 8 * 1024 * 1024; 317 break; 318 default: 319 *size = 8 * 1024 * 1024; 320 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); 321 } 322 } 323 324 static void bdw_get_stolen_reserved(struct drm_i915_private *i915, 325 struct intel_uncore *uncore, 326 resource_size_t *base, 327 resource_size_t *size) 328 { 329 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 330 resource_size_t stolen_top = i915->dsm.end + 1; 331 332 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 333 334 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 335 return; 336 337 if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK)) 338 return; 339 340 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 341 *size = stolen_top - *base; 342 } 343 344 static void icl_get_stolen_reserved(struct drm_i915_private *i915, 345 struct intel_uncore *uncore, 346 resource_size_t *base, 347 resource_size_t *size) 348 { 349 u64 reg_val = intel_uncore_read64(uncore, GEN6_STOLEN_RESERVED); 350 351 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val); 352 353 *base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK; 354 355 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { 356 case GEN8_STOLEN_RESERVED_1M: 357 *size = 1024 * 1024; 358 break; 359 case GEN8_STOLEN_RESERVED_2M: 360 *size = 2 * 1024 * 1024; 361 break; 362 case GEN8_STOLEN_RESERVED_4M: 363 *size = 4 * 1024 * 1024; 364 break; 365 case GEN8_STOLEN_RESERVED_8M: 366 *size = 8 * 1024 * 1024; 367 break; 368 default: 369 *size = 8 * 1024 * 1024; 370 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); 371 } 372 } 373 374 static int i915_gem_init_stolen(struct drm_i915_private *i915) 375 { 376 struct intel_uncore *uncore = &i915->uncore; 377 resource_size_t reserved_base, stolen_top; 378 resource_size_t reserved_total, reserved_size; 379 380 mutex_init(&i915->mm.stolen_lock); 381 382 if (intel_vgpu_active(i915)) { 383 dev_notice(i915->drm.dev, 384 "%s, disabling use of stolen memory\n", 385 "iGVT-g active"); 386 return 0; 387 } 388 389 if (intel_vtd_active() && INTEL_GEN(i915) < 8) { 390 dev_notice(i915->drm.dev, 391 "%s, disabling use of stolen memory\n", 392 "DMAR active"); 393 return 0; 394 } 395 396 if (resource_size(&intel_graphics_stolen_res) == 0) 397 return 0; 398 399 i915->dsm = intel_graphics_stolen_res; 400 401 if (i915_adjust_stolen(i915, &i915->dsm)) 402 return 0; 403 404 GEM_BUG_ON(i915->dsm.start == 0); 405 GEM_BUG_ON(i915->dsm.end <= i915->dsm.start); 406 407 stolen_top = i915->dsm.end + 1; 408 reserved_base = stolen_top; 409 reserved_size = 0; 410 411 switch (INTEL_GEN(i915)) { 412 case 2: 413 case 3: 414 break; 415 case 4: 416 if (!IS_G4X(i915)) 417 break; 418 /* fall through */ 419 case 5: 420 g4x_get_stolen_reserved(i915, uncore, 421 &reserved_base, &reserved_size); 422 break; 423 case 6: 424 gen6_get_stolen_reserved(i915, uncore, 425 &reserved_base, &reserved_size); 426 break; 427 case 7: 428 if (IS_VALLEYVIEW(i915)) 429 vlv_get_stolen_reserved(i915, uncore, 430 &reserved_base, &reserved_size); 431 else 432 gen7_get_stolen_reserved(i915, uncore, 433 &reserved_base, &reserved_size); 434 break; 435 case 8: 436 case 9: 437 case 10: 438 if (IS_LP(i915)) 439 chv_get_stolen_reserved(i915, uncore, 440 &reserved_base, &reserved_size); 441 else 442 bdw_get_stolen_reserved(i915, uncore, 443 &reserved_base, &reserved_size); 444 break; 445 default: 446 MISSING_CASE(INTEL_GEN(i915)); 447 /* fall-through */ 448 case 11: 449 case 12: 450 icl_get_stolen_reserved(i915, uncore, 451 &reserved_base, 452 &reserved_size); 453 break; 454 } 455 456 /* 457 * Our expectation is that the reserved space is at the top of the 458 * stolen region and *never* at the bottom. If we see !reserved_base, 459 * it likely means we failed to read the registers correctly. 460 */ 461 if (!reserved_base) { 462 drm_err(&i915->drm, 463 "inconsistent reservation %pa + %pa; ignoring\n", 464 &reserved_base, &reserved_size); 465 reserved_base = stolen_top; 466 reserved_size = 0; 467 } 468 469 i915->dsm_reserved = 470 (struct resource)DEFINE_RES_MEM(reserved_base, reserved_size); 471 472 if (!resource_contains(&i915->dsm, &i915->dsm_reserved)) { 473 drm_err(&i915->drm, 474 "Stolen reserved area %pR outside stolen memory %pR\n", 475 &i915->dsm_reserved, &i915->dsm); 476 return 0; 477 } 478 479 /* It is possible for the reserved area to end before the end of stolen 480 * memory, so just consider the start. */ 481 reserved_total = stolen_top - reserved_base; 482 483 drm_dbg(&i915->drm, 484 "Memory reserved for graphics device: %lluK, usable: %lluK\n", 485 (u64)resource_size(&i915->dsm) >> 10, 486 ((u64)resource_size(&i915->dsm) - reserved_total) >> 10); 487 488 i915->stolen_usable_size = 489 resource_size(&i915->dsm) - reserved_total; 490 491 /* Basic memrange allocator for stolen space. */ 492 drm_mm_init(&i915->mm.stolen, 0, i915->stolen_usable_size); 493 494 return 0; 495 } 496 497 static struct sg_table * 498 i915_pages_create_for_stolen(struct drm_device *dev, 499 resource_size_t offset, resource_size_t size) 500 { 501 struct drm_i915_private *i915 = to_i915(dev); 502 struct sg_table *st; 503 struct scatterlist *sg; 504 505 GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm))); 506 507 /* We hide that we have no struct page backing our stolen object 508 * by wrapping the contiguous physical allocation with a fake 509 * dma mapping in a single scatterlist. 510 */ 511 512 st = kmalloc(sizeof(*st), GFP_KERNEL); 513 if (st == NULL) 514 return ERR_PTR(-ENOMEM); 515 516 if (sg_alloc_table(st, 1, GFP_KERNEL)) { 517 kfree(st); 518 return ERR_PTR(-ENOMEM); 519 } 520 521 sg = st->sgl; 522 sg->offset = 0; 523 sg->length = size; 524 525 sg_dma_address(sg) = (dma_addr_t)i915->dsm.start + offset; 526 sg_dma_len(sg) = size; 527 528 return st; 529 } 530 531 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) 532 { 533 struct sg_table *pages = 534 i915_pages_create_for_stolen(obj->base.dev, 535 obj->stolen->start, 536 obj->stolen->size); 537 if (IS_ERR(pages)) 538 return PTR_ERR(pages); 539 540 __i915_gem_object_set_pages(obj, pages, obj->stolen->size); 541 542 return 0; 543 } 544 545 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj, 546 struct sg_table *pages) 547 { 548 /* Should only be called from i915_gem_object_release_stolen() */ 549 sg_free_table(pages); 550 kfree(pages); 551 } 552 553 static void 554 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) 555 { 556 struct drm_i915_private *i915 = to_i915(obj->base.dev); 557 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen); 558 559 GEM_BUG_ON(!stolen); 560 561 i915_gem_object_release_memory_region(obj); 562 563 i915_gem_stolen_remove_node(i915, stolen); 564 kfree(stolen); 565 } 566 567 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { 568 .get_pages = i915_gem_object_get_pages_stolen, 569 .put_pages = i915_gem_object_put_pages_stolen, 570 .release = i915_gem_object_release_stolen, 571 }; 572 573 static struct drm_i915_gem_object * 574 __i915_gem_object_create_stolen(struct intel_memory_region *mem, 575 struct drm_mm_node *stolen) 576 { 577 static struct lock_class_key lock_class; 578 struct drm_i915_gem_object *obj; 579 unsigned int cache_level; 580 int err = -ENOMEM; 581 582 obj = i915_gem_object_alloc(); 583 if (!obj) 584 goto err; 585 586 drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size); 587 i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class); 588 589 obj->stolen = stolen; 590 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; 591 cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE; 592 i915_gem_object_set_cache_coherency(obj, cache_level); 593 594 err = i915_gem_object_pin_pages(obj); 595 if (err) 596 goto cleanup; 597 598 i915_gem_object_init_memory_region(obj, mem, 0); 599 600 return obj; 601 602 cleanup: 603 i915_gem_object_free(obj); 604 err: 605 return ERR_PTR(err); 606 } 607 608 static struct drm_i915_gem_object * 609 _i915_gem_object_create_stolen(struct intel_memory_region *mem, 610 resource_size_t size, 611 unsigned int flags) 612 { 613 struct drm_i915_private *i915 = mem->i915; 614 struct drm_i915_gem_object *obj; 615 struct drm_mm_node *stolen; 616 int ret; 617 618 if (!drm_mm_initialized(&i915->mm.stolen)) 619 return ERR_PTR(-ENODEV); 620 621 if (size == 0) 622 return ERR_PTR(-EINVAL); 623 624 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 625 if (!stolen) 626 return ERR_PTR(-ENOMEM); 627 628 ret = i915_gem_stolen_insert_node(i915, stolen, size, 4096); 629 if (ret) { 630 obj = ERR_PTR(ret); 631 goto err_free; 632 } 633 634 obj = __i915_gem_object_create_stolen(mem, stolen); 635 if (IS_ERR(obj)) 636 goto err_remove; 637 638 return obj; 639 640 err_remove: 641 i915_gem_stolen_remove_node(i915, stolen); 642 err_free: 643 kfree(stolen); 644 return obj; 645 } 646 647 struct drm_i915_gem_object * 648 i915_gem_object_create_stolen(struct drm_i915_private *i915, 649 resource_size_t size) 650 { 651 return i915_gem_object_create_region(i915->mm.regions[INTEL_REGION_STOLEN], 652 size, I915_BO_ALLOC_CONTIGUOUS); 653 } 654 655 static int init_stolen(struct intel_memory_region *mem) 656 { 657 intel_memory_region_set_name(mem, "stolen"); 658 659 /* 660 * Initialise stolen early so that we may reserve preallocated 661 * objects for the BIOS to KMS transition. 662 */ 663 return i915_gem_init_stolen(mem->i915); 664 } 665 666 static void release_stolen(struct intel_memory_region *mem) 667 { 668 i915_gem_cleanup_stolen(mem->i915); 669 } 670 671 static const struct intel_memory_region_ops i915_region_stolen_ops = { 672 .init = init_stolen, 673 .release = release_stolen, 674 .create_object = _i915_gem_object_create_stolen, 675 }; 676 677 struct intel_memory_region *i915_gem_stolen_setup(struct drm_i915_private *i915) 678 { 679 return intel_memory_region_create(i915, 680 intel_graphics_stolen_res.start, 681 resource_size(&intel_graphics_stolen_res), 682 PAGE_SIZE, 0, 683 &i915_region_stolen_ops); 684 } 685 686 struct drm_i915_gem_object * 687 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915, 688 resource_size_t stolen_offset, 689 resource_size_t size) 690 { 691 struct intel_memory_region *mem = i915->mm.regions[INTEL_REGION_STOLEN]; 692 struct drm_i915_gem_object *obj; 693 struct drm_mm_node *stolen; 694 int ret; 695 696 if (!drm_mm_initialized(&i915->mm.stolen)) 697 return ERR_PTR(-ENODEV); 698 699 drm_dbg(&i915->drm, 700 "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n", 701 &stolen_offset, &size); 702 703 /* KISS and expect everything to be page-aligned */ 704 if (GEM_WARN_ON(size == 0) || 705 GEM_WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) || 706 GEM_WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT))) 707 return ERR_PTR(-EINVAL); 708 709 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 710 if (!stolen) 711 return ERR_PTR(-ENOMEM); 712 713 stolen->start = stolen_offset; 714 stolen->size = size; 715 mutex_lock(&i915->mm.stolen_lock); 716 ret = drm_mm_reserve_node(&i915->mm.stolen, stolen); 717 mutex_unlock(&i915->mm.stolen_lock); 718 if (ret) { 719 obj = ERR_PTR(ret); 720 goto err_free; 721 } 722 723 obj = __i915_gem_object_create_stolen(mem, stolen); 724 if (IS_ERR(obj)) 725 goto err_stolen; 726 727 i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE); 728 return obj; 729 730 err_stolen: 731 i915_gem_stolen_remove_node(i915, stolen); 732 err_free: 733 kfree(stolen); 734 return obj; 735 } 736