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_lmem.h" 14 #include "gem/i915_gem_region.h" 15 #include "gt/intel_gt.h" 16 #include "gt/intel_gt_mcr.h" 17 #include "gt/intel_gt_regs.h" 18 #include "gt/intel_region_lmem.h" 19 #include "i915_drv.h" 20 #include "i915_gem_stolen.h" 21 #include "i915_pci.h" 22 #include "i915_reg.h" 23 #include "i915_utils.h" 24 #include "i915_vgpu.h" 25 #include "intel_mchbar_regs.h" 26 #include "intel_pci_config.h" 27 28 /* 29 * The BIOS typically reserves some of the system's memory for the exclusive 30 * use of the integrated graphics. This memory is no longer available for 31 * use by the OS and so the user finds that his system has less memory 32 * available than he put in. We refer to this memory as stolen. 33 * 34 * The BIOS will allocate its framebuffer from the stolen memory. Our 35 * goal is try to reuse that object for our own fbcon which must always 36 * be available for panics. Anything else we can reuse the stolen memory 37 * for is a boon. 38 */ 39 40 int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *i915, 41 struct drm_mm_node *node, u64 size, 42 unsigned alignment, u64 start, u64 end) 43 { 44 int ret; 45 46 if (!drm_mm_initialized(&i915->mm.stolen)) 47 return -ENODEV; 48 49 /* WaSkipStolenMemoryFirstPage:bdw+ */ 50 if (GRAPHICS_VER(i915) >= 8 && start < 4096) 51 start = 4096; 52 53 mutex_lock(&i915->mm.stolen_lock); 54 ret = drm_mm_insert_node_in_range(&i915->mm.stolen, node, 55 size, alignment, 0, 56 start, end, DRM_MM_INSERT_BEST); 57 mutex_unlock(&i915->mm.stolen_lock); 58 59 return ret; 60 } 61 62 int i915_gem_stolen_insert_node(struct drm_i915_private *i915, 63 struct drm_mm_node *node, u64 size, 64 unsigned alignment) 65 { 66 return i915_gem_stolen_insert_node_in_range(i915, node, 67 size, alignment, 68 I915_GEM_STOLEN_BIAS, 69 U64_MAX); 70 } 71 72 void i915_gem_stolen_remove_node(struct drm_i915_private *i915, 73 struct drm_mm_node *node) 74 { 75 mutex_lock(&i915->mm.stolen_lock); 76 drm_mm_remove_node(node); 77 mutex_unlock(&i915->mm.stolen_lock); 78 } 79 80 static bool valid_stolen_size(struct drm_i915_private *i915, struct resource *dsm) 81 { 82 return (dsm->start != 0 || HAS_LMEMBAR_SMEM_STOLEN(i915)) && dsm->end > dsm->start; 83 } 84 85 static int adjust_stolen(struct drm_i915_private *i915, 86 struct resource *dsm) 87 { 88 struct i915_ggtt *ggtt = to_gt(i915)->ggtt; 89 struct intel_uncore *uncore = ggtt->vm.gt->uncore; 90 91 if (!valid_stolen_size(i915, dsm)) 92 return -EINVAL; 93 94 /* 95 * Make sure we don't clobber the GTT if it's within stolen memory 96 * 97 * TODO: We have yet too encounter the case where the GTT wasn't at the 98 * end of stolen. With that assumption we could simplify this. 99 */ 100 if (GRAPHICS_VER(i915) <= 4 && 101 !IS_G33(i915) && !IS_PINEVIEW(i915) && !IS_G4X(i915)) { 102 struct resource stolen[2] = {*dsm, *dsm}; 103 struct resource ggtt_res; 104 resource_size_t ggtt_start; 105 106 ggtt_start = intel_uncore_read(uncore, PGTBL_CTL); 107 if (GRAPHICS_VER(i915) == 4) 108 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) | 109 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28; 110 else 111 ggtt_start &= PGTBL_ADDRESS_LO_MASK; 112 113 ggtt_res = 114 (struct resource) DEFINE_RES_MEM(ggtt_start, 115 ggtt_total_entries(ggtt) * 4); 116 117 if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end) 118 stolen[0].end = ggtt_res.start; 119 if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end) 120 stolen[1].start = ggtt_res.end; 121 122 /* Pick the larger of the two chunks */ 123 if (resource_size(&stolen[0]) > resource_size(&stolen[1])) 124 *dsm = stolen[0]; 125 else 126 *dsm = stolen[1]; 127 128 if (stolen[0].start != stolen[1].start || 129 stolen[0].end != stolen[1].end) { 130 drm_dbg(&i915->drm, 131 "GTT within stolen memory at %pR\n", 132 &ggtt_res); 133 drm_dbg(&i915->drm, "Stolen memory adjusted to %pR\n", 134 dsm); 135 } 136 } 137 138 if (!valid_stolen_size(i915, dsm)) 139 return -EINVAL; 140 141 return 0; 142 } 143 144 static int request_smem_stolen(struct drm_i915_private *i915, 145 struct resource *dsm) 146 { 147 struct resource *r; 148 149 /* 150 * With stolen lmem, we don't need to request system memory for the 151 * address range since it's local to the gpu. 152 * 153 * Starting MTL, in IGFX devices the stolen memory is exposed via 154 * LMEMBAR and shall be considered similar to stolen lmem. 155 */ 156 if (HAS_LMEM(i915) || HAS_LMEMBAR_SMEM_STOLEN(i915)) 157 return 0; 158 159 /* 160 * Verify that nothing else uses this physical address. Stolen 161 * memory should be reserved by the BIOS and hidden from the 162 * kernel. So if the region is already marked as busy, something 163 * is seriously wrong. 164 */ 165 r = devm_request_mem_region(i915->drm.dev, dsm->start, 166 resource_size(dsm), 167 "Graphics Stolen Memory"); 168 if (r == NULL) { 169 /* 170 * One more attempt but this time requesting region from 171 * start + 1, as we have seen that this resolves the region 172 * conflict with the PCI Bus. 173 * This is a BIOS w/a: Some BIOS wrap stolen in the root 174 * PCI bus, but have an off-by-one error. Hence retry the 175 * reservation starting from 1 instead of 0. 176 * There's also BIOS with off-by-one on the other end. 177 */ 178 r = devm_request_mem_region(i915->drm.dev, dsm->start + 1, 179 resource_size(dsm) - 2, 180 "Graphics Stolen Memory"); 181 /* 182 * GEN3 firmware likes to smash pci bridges into the stolen 183 * range. Apparently this works. 184 */ 185 if (!r && GRAPHICS_VER(i915) != 3) { 186 drm_err(&i915->drm, 187 "conflict detected with stolen region: %pR\n", 188 dsm); 189 190 return -EBUSY; 191 } 192 } 193 194 return 0; 195 } 196 197 static void i915_gem_cleanup_stolen(struct drm_i915_private *i915) 198 { 199 if (!drm_mm_initialized(&i915->mm.stolen)) 200 return; 201 202 drm_mm_takedown(&i915->mm.stolen); 203 } 204 205 static void g4x_get_stolen_reserved(struct drm_i915_private *i915, 206 struct intel_uncore *uncore, 207 resource_size_t *base, 208 resource_size_t *size) 209 { 210 u32 reg_val = intel_uncore_read(uncore, 211 IS_GM45(i915) ? 212 CTG_STOLEN_RESERVED : 213 ELK_STOLEN_RESERVED); 214 resource_size_t stolen_top = i915->dsm.end + 1; 215 216 drm_dbg(&i915->drm, "%s_STOLEN_RESERVED = %08x\n", 217 IS_GM45(i915) ? "CTG" : "ELK", reg_val); 218 219 if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0) 220 return; 221 222 /* 223 * Whether ILK really reuses the ELK register for this is unclear. 224 * Let's see if we catch anyone with this supposedly enabled on ILK. 225 */ 226 drm_WARN(&i915->drm, GRAPHICS_VER(i915) == 5, 227 "ILK stolen reserved found? 0x%08x\n", 228 reg_val); 229 230 if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK)) 231 return; 232 233 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16; 234 drm_WARN_ON(&i915->drm, 235 (reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base); 236 237 *size = stolen_top - *base; 238 } 239 240 static void gen6_get_stolen_reserved(struct drm_i915_private *i915, 241 struct intel_uncore *uncore, 242 resource_size_t *base, 243 resource_size_t *size) 244 { 245 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 246 247 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 248 249 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 250 return; 251 252 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 253 254 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) { 255 case GEN6_STOLEN_RESERVED_1M: 256 *size = 1024 * 1024; 257 break; 258 case GEN6_STOLEN_RESERVED_512K: 259 *size = 512 * 1024; 260 break; 261 case GEN6_STOLEN_RESERVED_256K: 262 *size = 256 * 1024; 263 break; 264 case GEN6_STOLEN_RESERVED_128K: 265 *size = 128 * 1024; 266 break; 267 default: 268 *size = 1024 * 1024; 269 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK); 270 } 271 } 272 273 static void vlv_get_stolen_reserved(struct drm_i915_private *i915, 274 struct intel_uncore *uncore, 275 resource_size_t *base, 276 resource_size_t *size) 277 { 278 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 279 resource_size_t stolen_top = i915->dsm.end + 1; 280 281 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 282 283 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 284 return; 285 286 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { 287 default: 288 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); 289 fallthrough; 290 case GEN7_STOLEN_RESERVED_1M: 291 *size = 1024 * 1024; 292 break; 293 } 294 295 /* 296 * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the 297 * reserved location as (top - size). 298 */ 299 *base = stolen_top - *size; 300 } 301 302 static void gen7_get_stolen_reserved(struct drm_i915_private *i915, 303 struct intel_uncore *uncore, 304 resource_size_t *base, 305 resource_size_t *size) 306 { 307 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 308 309 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 310 311 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 312 return; 313 314 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK; 315 316 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { 317 case GEN7_STOLEN_RESERVED_1M: 318 *size = 1024 * 1024; 319 break; 320 case GEN7_STOLEN_RESERVED_256K: 321 *size = 256 * 1024; 322 break; 323 default: 324 *size = 1024 * 1024; 325 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); 326 } 327 } 328 329 static void chv_get_stolen_reserved(struct drm_i915_private *i915, 330 struct intel_uncore *uncore, 331 resource_size_t *base, 332 resource_size_t *size) 333 { 334 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 335 336 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 337 338 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 339 return; 340 341 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 342 343 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { 344 case GEN8_STOLEN_RESERVED_1M: 345 *size = 1024 * 1024; 346 break; 347 case GEN8_STOLEN_RESERVED_2M: 348 *size = 2 * 1024 * 1024; 349 break; 350 case GEN8_STOLEN_RESERVED_4M: 351 *size = 4 * 1024 * 1024; 352 break; 353 case GEN8_STOLEN_RESERVED_8M: 354 *size = 8 * 1024 * 1024; 355 break; 356 default: 357 *size = 8 * 1024 * 1024; 358 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); 359 } 360 } 361 362 static void bdw_get_stolen_reserved(struct drm_i915_private *i915, 363 struct intel_uncore *uncore, 364 resource_size_t *base, 365 resource_size_t *size) 366 { 367 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 368 resource_size_t stolen_top = i915->dsm.end + 1; 369 370 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 371 372 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 373 return; 374 375 if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK)) 376 return; 377 378 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 379 *size = stolen_top - *base; 380 } 381 382 static void icl_get_stolen_reserved(struct drm_i915_private *i915, 383 struct intel_uncore *uncore, 384 resource_size_t *base, 385 resource_size_t *size) 386 { 387 u64 reg_val = intel_uncore_read64(uncore, GEN6_STOLEN_RESERVED); 388 389 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val); 390 391 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { 392 case GEN8_STOLEN_RESERVED_1M: 393 *size = 1024 * 1024; 394 break; 395 case GEN8_STOLEN_RESERVED_2M: 396 *size = 2 * 1024 * 1024; 397 break; 398 case GEN8_STOLEN_RESERVED_4M: 399 *size = 4 * 1024 * 1024; 400 break; 401 case GEN8_STOLEN_RESERVED_8M: 402 *size = 8 * 1024 * 1024; 403 break; 404 default: 405 *size = 8 * 1024 * 1024; 406 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); 407 } 408 409 if (HAS_LMEMBAR_SMEM_STOLEN(i915)) 410 /* the base is initialized to stolen top so subtract size to get base */ 411 *base -= *size; 412 else 413 *base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK; 414 } 415 416 /* 417 * Initialize i915->dsm_reserved to contain the reserved space within the Data 418 * Stolen Memory. This is a range on the top of DSM that is reserved, not to 419 * be used by driver, so must be excluded from the region passed to the 420 * allocator later. In the spec this is also called as WOPCM. 421 * 422 * Our expectation is that the reserved space is at the top of the stolen 423 * region, as it has been the case for every platform, and *never* at the 424 * bottom, so the calculation here can be simplified. 425 */ 426 static int init_reserved_stolen(struct drm_i915_private *i915) 427 { 428 struct intel_uncore *uncore = &i915->uncore; 429 resource_size_t reserved_base, stolen_top; 430 resource_size_t reserved_size; 431 int ret = 0; 432 433 stolen_top = i915->dsm.end + 1; 434 reserved_base = stolen_top; 435 reserved_size = 0; 436 437 if (GRAPHICS_VER(i915) >= 11) { 438 icl_get_stolen_reserved(i915, uncore, 439 &reserved_base, &reserved_size); 440 } else if (GRAPHICS_VER(i915) >= 8) { 441 if (IS_LP(i915)) 442 chv_get_stolen_reserved(i915, uncore, 443 &reserved_base, &reserved_size); 444 else 445 bdw_get_stolen_reserved(i915, uncore, 446 &reserved_base, &reserved_size); 447 } else if (GRAPHICS_VER(i915) >= 7) { 448 if (IS_VALLEYVIEW(i915)) 449 vlv_get_stolen_reserved(i915, uncore, 450 &reserved_base, &reserved_size); 451 else 452 gen7_get_stolen_reserved(i915, uncore, 453 &reserved_base, &reserved_size); 454 } else if (GRAPHICS_VER(i915) >= 6) { 455 gen6_get_stolen_reserved(i915, uncore, 456 &reserved_base, &reserved_size); 457 } else if (GRAPHICS_VER(i915) >= 5 || IS_G4X(i915)) { 458 g4x_get_stolen_reserved(i915, uncore, 459 &reserved_base, &reserved_size); 460 } 461 462 /* No reserved stolen */ 463 if (reserved_base == stolen_top) 464 goto bail_out; 465 466 if (!reserved_base) { 467 drm_err(&i915->drm, 468 "inconsistent reservation %pa + %pa; ignoring\n", 469 &reserved_base, &reserved_size); 470 ret = -EINVAL; 471 goto bail_out; 472 } 473 474 i915->dsm_reserved = 475 (struct resource)DEFINE_RES_MEM(reserved_base, reserved_size); 476 477 if (!resource_contains(&i915->dsm, &i915->dsm_reserved)) { 478 drm_err(&i915->drm, 479 "Stolen reserved area %pR outside stolen memory %pR\n", 480 &i915->dsm_reserved, &i915->dsm); 481 ret = -EINVAL; 482 goto bail_out; 483 } 484 485 return 0; 486 487 bail_out: 488 i915->dsm_reserved = 489 (struct resource)DEFINE_RES_MEM(reserved_base, 0); 490 491 return ret; 492 } 493 494 static int i915_gem_init_stolen(struct intel_memory_region *mem) 495 { 496 struct drm_i915_private *i915 = mem->i915; 497 498 mutex_init(&i915->mm.stolen_lock); 499 500 if (intel_vgpu_active(i915)) { 501 drm_notice(&i915->drm, 502 "%s, disabling use of stolen memory\n", 503 "iGVT-g active"); 504 return -ENOSPC; 505 } 506 507 if (i915_vtd_active(i915) && GRAPHICS_VER(i915) < 8) { 508 drm_notice(&i915->drm, 509 "%s, disabling use of stolen memory\n", 510 "DMAR active"); 511 return -ENOSPC; 512 } 513 514 if (adjust_stolen(i915, &mem->region)) 515 return -ENOSPC; 516 517 if (request_smem_stolen(i915, &mem->region)) 518 return -ENOSPC; 519 520 i915->dsm = mem->region; 521 522 if (init_reserved_stolen(i915)) 523 return -ENOSPC; 524 525 /* Exclude the reserved region from driver use */ 526 mem->region.end = i915->dsm_reserved.start - 1; 527 mem->io_size = min(mem->io_size, resource_size(&mem->region)); 528 529 i915->stolen_usable_size = resource_size(&mem->region); 530 531 drm_dbg(&i915->drm, 532 "Memory reserved for graphics device: %lluK, usable: %lluK\n", 533 (u64)resource_size(&i915->dsm) >> 10, 534 (u64)i915->stolen_usable_size >> 10); 535 536 if (i915->stolen_usable_size == 0) 537 return -ENOSPC; 538 539 /* Basic memrange allocator for stolen space. */ 540 drm_mm_init(&i915->mm.stolen, 0, i915->stolen_usable_size); 541 542 return 0; 543 } 544 545 static void dbg_poison(struct i915_ggtt *ggtt, 546 dma_addr_t addr, resource_size_t size, 547 u8 x) 548 { 549 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) 550 if (!drm_mm_node_allocated(&ggtt->error_capture)) 551 return; 552 553 if (ggtt->vm.bind_async_flags & I915_VMA_GLOBAL_BIND) 554 return; /* beware stop_machine() inversion */ 555 556 GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE)); 557 558 mutex_lock(&ggtt->error_mutex); 559 while (size) { 560 void __iomem *s; 561 562 ggtt->vm.insert_page(&ggtt->vm, addr, 563 ggtt->error_capture.start, 564 I915_CACHE_NONE, 0); 565 mb(); 566 567 s = io_mapping_map_wc(&ggtt->iomap, 568 ggtt->error_capture.start, 569 PAGE_SIZE); 570 memset_io(s, x, PAGE_SIZE); 571 io_mapping_unmap(s); 572 573 addr += PAGE_SIZE; 574 size -= PAGE_SIZE; 575 } 576 mb(); 577 ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE); 578 mutex_unlock(&ggtt->error_mutex); 579 #endif 580 } 581 582 static struct sg_table * 583 i915_pages_create_for_stolen(struct drm_device *dev, 584 resource_size_t offset, resource_size_t size) 585 { 586 struct drm_i915_private *i915 = to_i915(dev); 587 struct sg_table *st; 588 struct scatterlist *sg; 589 590 GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm))); 591 592 /* We hide that we have no struct page backing our stolen object 593 * by wrapping the contiguous physical allocation with a fake 594 * dma mapping in a single scatterlist. 595 */ 596 597 st = kmalloc(sizeof(*st), GFP_KERNEL); 598 if (st == NULL) 599 return ERR_PTR(-ENOMEM); 600 601 if (sg_alloc_table(st, 1, GFP_KERNEL)) { 602 kfree(st); 603 return ERR_PTR(-ENOMEM); 604 } 605 606 sg = st->sgl; 607 sg->offset = 0; 608 sg->length = size; 609 610 sg_dma_address(sg) = (dma_addr_t)i915->dsm.start + offset; 611 sg_dma_len(sg) = size; 612 613 return st; 614 } 615 616 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) 617 { 618 struct drm_i915_private *i915 = to_i915(obj->base.dev); 619 struct sg_table *pages = 620 i915_pages_create_for_stolen(obj->base.dev, 621 obj->stolen->start, 622 obj->stolen->size); 623 if (IS_ERR(pages)) 624 return PTR_ERR(pages); 625 626 dbg_poison(to_gt(i915)->ggtt, 627 sg_dma_address(pages->sgl), 628 sg_dma_len(pages->sgl), 629 POISON_INUSE); 630 631 __i915_gem_object_set_pages(obj, pages, obj->stolen->size); 632 633 return 0; 634 } 635 636 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj, 637 struct sg_table *pages) 638 { 639 struct drm_i915_private *i915 = to_i915(obj->base.dev); 640 /* Should only be called from i915_gem_object_release_stolen() */ 641 642 dbg_poison(to_gt(i915)->ggtt, 643 sg_dma_address(pages->sgl), 644 sg_dma_len(pages->sgl), 645 POISON_FREE); 646 647 sg_free_table(pages); 648 kfree(pages); 649 } 650 651 static void 652 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) 653 { 654 struct drm_i915_private *i915 = to_i915(obj->base.dev); 655 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen); 656 657 GEM_BUG_ON(!stolen); 658 i915_gem_stolen_remove_node(i915, stolen); 659 kfree(stolen); 660 661 i915_gem_object_release_memory_region(obj); 662 } 663 664 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { 665 .name = "i915_gem_object_stolen", 666 .get_pages = i915_gem_object_get_pages_stolen, 667 .put_pages = i915_gem_object_put_pages_stolen, 668 .release = i915_gem_object_release_stolen, 669 }; 670 671 static int __i915_gem_object_create_stolen(struct intel_memory_region *mem, 672 struct drm_i915_gem_object *obj, 673 struct drm_mm_node *stolen) 674 { 675 static struct lock_class_key lock_class; 676 unsigned int cache_level; 677 unsigned int flags; 678 int err; 679 680 /* 681 * Stolen objects are always physically contiguous since we just 682 * allocate one big block underneath using the drm_mm range allocator. 683 */ 684 flags = I915_BO_ALLOC_CONTIGUOUS; 685 686 drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size); 687 i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class, flags); 688 689 obj->stolen = stolen; 690 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; 691 cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE; 692 i915_gem_object_set_cache_coherency(obj, cache_level); 693 694 if (WARN_ON(!i915_gem_object_trylock(obj, NULL))) 695 return -EBUSY; 696 697 i915_gem_object_init_memory_region(obj, mem); 698 699 err = i915_gem_object_pin_pages(obj); 700 if (err) 701 i915_gem_object_release_memory_region(obj); 702 i915_gem_object_unlock(obj); 703 704 return err; 705 } 706 707 static int _i915_gem_object_stolen_init(struct intel_memory_region *mem, 708 struct drm_i915_gem_object *obj, 709 resource_size_t offset, 710 resource_size_t size, 711 resource_size_t page_size, 712 unsigned int flags) 713 { 714 struct drm_i915_private *i915 = mem->i915; 715 struct drm_mm_node *stolen; 716 int ret; 717 718 if (!drm_mm_initialized(&i915->mm.stolen)) 719 return -ENODEV; 720 721 if (size == 0) 722 return -EINVAL; 723 724 /* 725 * With discrete devices, where we lack a mappable aperture there is no 726 * possible way to ever access this memory on the CPU side. 727 */ 728 if (mem->type == INTEL_MEMORY_STOLEN_LOCAL && !mem->io_size && 729 !(flags & I915_BO_ALLOC_GPU_ONLY)) 730 return -ENOSPC; 731 732 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 733 if (!stolen) 734 return -ENOMEM; 735 736 if (offset != I915_BO_INVALID_OFFSET) { 737 drm_dbg(&i915->drm, 738 "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n", 739 &offset, &size); 740 741 stolen->start = offset; 742 stolen->size = size; 743 mutex_lock(&i915->mm.stolen_lock); 744 ret = drm_mm_reserve_node(&i915->mm.stolen, stolen); 745 mutex_unlock(&i915->mm.stolen_lock); 746 } else { 747 ret = i915_gem_stolen_insert_node(i915, stolen, size, 748 mem->min_page_size); 749 } 750 if (ret) 751 goto err_free; 752 753 ret = __i915_gem_object_create_stolen(mem, obj, stolen); 754 if (ret) 755 goto err_remove; 756 757 return 0; 758 759 err_remove: 760 i915_gem_stolen_remove_node(i915, stolen); 761 err_free: 762 kfree(stolen); 763 return ret; 764 } 765 766 struct drm_i915_gem_object * 767 i915_gem_object_create_stolen(struct drm_i915_private *i915, 768 resource_size_t size) 769 { 770 return i915_gem_object_create_region(i915->mm.stolen_region, size, 0, 0); 771 } 772 773 static int init_stolen_smem(struct intel_memory_region *mem) 774 { 775 int err; 776 777 /* 778 * Initialise stolen early so that we may reserve preallocated 779 * objects for the BIOS to KMS transition. 780 */ 781 err = i915_gem_init_stolen(mem); 782 if (err) 783 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); 784 785 return 0; 786 } 787 788 static int release_stolen_smem(struct intel_memory_region *mem) 789 { 790 i915_gem_cleanup_stolen(mem->i915); 791 return 0; 792 } 793 794 static const struct intel_memory_region_ops i915_region_stolen_smem_ops = { 795 .init = init_stolen_smem, 796 .release = release_stolen_smem, 797 .init_object = _i915_gem_object_stolen_init, 798 }; 799 800 static int init_stolen_lmem(struct intel_memory_region *mem) 801 { 802 struct drm_i915_private *i915 = mem->i915; 803 int err; 804 805 if (GEM_WARN_ON(resource_size(&mem->region) == 0)) 806 return 0; 807 808 err = i915_gem_init_stolen(mem); 809 if (err) { 810 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); 811 return 0; 812 } 813 814 if (mem->io_size && 815 !io_mapping_init_wc(&mem->iomap, mem->io_start, mem->io_size)) 816 goto err_cleanup; 817 818 drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n", 819 &mem->io_start); 820 drm_dbg(&i915->drm, "Stolen Local DSM base: %pa\n", &mem->region.start); 821 822 return 0; 823 824 err_cleanup: 825 i915_gem_cleanup_stolen(mem->i915); 826 return err; 827 } 828 829 static int release_stolen_lmem(struct intel_memory_region *mem) 830 { 831 if (mem->io_size) 832 io_mapping_fini(&mem->iomap); 833 i915_gem_cleanup_stolen(mem->i915); 834 return 0; 835 } 836 837 static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = { 838 .init = init_stolen_lmem, 839 .release = release_stolen_lmem, 840 .init_object = _i915_gem_object_stolen_init, 841 }; 842 843 static int mtl_get_gms_size(struct intel_uncore *uncore) 844 { 845 u16 ggc, gms; 846 847 ggc = intel_uncore_read16(uncore, GGC); 848 849 /* check GGMS, should be fixed 0x3 (8MB) */ 850 if ((ggc & GGMS_MASK) != GGMS_MASK) 851 return -EIO; 852 853 /* return valid GMS value, -EIO if invalid */ 854 gms = REG_FIELD_GET(GMS_MASK, ggc); 855 switch (gms) { 856 case 0x0 ... 0x04: 857 return gms * 32; 858 case 0xf0 ... 0xfe: 859 return (gms - 0xf0 + 1) * 4; 860 default: 861 MISSING_CASE(gms); 862 return -EIO; 863 } 864 } 865 866 struct intel_memory_region * 867 i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type, 868 u16 instance) 869 { 870 struct intel_uncore *uncore = &i915->uncore; 871 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); 872 resource_size_t dsm_size, dsm_base, lmem_size; 873 struct intel_memory_region *mem; 874 resource_size_t io_start, io_size; 875 resource_size_t min_page_size; 876 int ret; 877 878 if (WARN_ON_ONCE(instance)) 879 return ERR_PTR(-ENODEV); 880 881 if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR)) 882 return ERR_PTR(-ENXIO); 883 884 if (HAS_LMEMBAR_SMEM_STOLEN(i915) || IS_DG1(i915)) { 885 lmem_size = pci_resource_len(pdev, GEN12_LMEM_BAR); 886 } else { 887 resource_size_t lmem_range; 888 889 lmem_range = intel_gt_mcr_read_any(&i915->gt0, XEHP_TILE0_ADDR_RANGE) & 0xFFFF; 890 lmem_size = lmem_range >> XEHP_TILE_LMEM_RANGE_SHIFT; 891 lmem_size *= SZ_1G; 892 } 893 894 if (HAS_LMEMBAR_SMEM_STOLEN(i915)) { 895 /* 896 * MTL dsm size is in GGC register. 897 * Also MTL uses offset to DSMBASE in ptes, so i915 898 * uses dsm_base = 0 to setup stolen region. 899 */ 900 ret = mtl_get_gms_size(uncore); 901 if (ret < 0) { 902 drm_err(&i915->drm, "invalid MTL GGC register setting\n"); 903 return ERR_PTR(ret); 904 } 905 906 dsm_base = 0; 907 dsm_size = (resource_size_t)(ret * SZ_1M); 908 909 GEM_BUG_ON(pci_resource_len(pdev, GEN12_LMEM_BAR) != SZ_256M); 910 GEM_BUG_ON((dsm_size + SZ_8M) > lmem_size); 911 } else { 912 /* Use DSM base address instead for stolen memory */ 913 dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE) & GEN12_BDSM_MASK; 914 if (WARN_ON(lmem_size < dsm_base)) 915 return ERR_PTR(-ENODEV); 916 dsm_size = lmem_size - dsm_base; 917 } 918 919 io_size = dsm_size; 920 if (HAS_LMEMBAR_SMEM_STOLEN(i915)) { 921 io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + SZ_8M; 922 } else if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) { 923 io_start = 0; 924 io_size = 0; 925 } else { 926 io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + dsm_base; 927 } 928 929 min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K : 930 I915_GTT_PAGE_SIZE_4K; 931 932 mem = intel_memory_region_create(i915, dsm_base, dsm_size, 933 min_page_size, 934 io_start, io_size, 935 type, instance, 936 &i915_region_stolen_lmem_ops); 937 if (IS_ERR(mem)) 938 return mem; 939 940 intel_memory_region_set_name(mem, "stolen-local"); 941 942 mem->private = true; 943 944 return mem; 945 } 946 947 struct intel_memory_region* 948 i915_gem_stolen_smem_setup(struct drm_i915_private *i915, u16 type, 949 u16 instance) 950 { 951 struct intel_memory_region *mem; 952 953 mem = intel_memory_region_create(i915, 954 intel_graphics_stolen_res.start, 955 resource_size(&intel_graphics_stolen_res), 956 PAGE_SIZE, 0, 0, type, instance, 957 &i915_region_stolen_smem_ops); 958 if (IS_ERR(mem)) 959 return mem; 960 961 intel_memory_region_set_name(mem, "stolen-system"); 962 963 mem->private = true; 964 965 return mem; 966 } 967 968 bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj) 969 { 970 return obj->ops == &i915_gem_object_stolen_ops; 971 } 972