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 40int 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 62int 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 72void 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 80static 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 85static 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 = DEFINE_RES_MEM(ggtt_start, ggtt_total_entries(ggtt) * 4); 114 115 if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end) 116 stolen[0].end = ggtt_res.start; 117 if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end) 118 stolen[1].start = ggtt_res.end; 119 120 /* Pick the larger of the two chunks */ 121 if (resource_size(&stolen[0]) > resource_size(&stolen[1])) 122 *dsm = stolen[0]; 123 else 124 *dsm = stolen[1]; 125 126 if (stolen[0].start != stolen[1].start || 127 stolen[0].end != stolen[1].end) { 128 drm_dbg(&i915->drm, 129 "GTT within stolen memory at %pR\n", 130 &ggtt_res); 131 drm_dbg(&i915->drm, "Stolen memory adjusted to %pR\n", 132 dsm); 133 } 134 } 135 136 if (!valid_stolen_size(i915, dsm)) 137 return -EINVAL; 138 139 return 0; 140} 141 142static int request_smem_stolen(struct drm_i915_private *i915, 143 struct resource *dsm) 144{ 145 struct resource *r; 146 147 /* 148 * With stolen lmem, we don't need to request system memory for the 149 * address range since it's local to the gpu. 150 * 151 * Starting MTL, in IGFX devices the stolen memory is exposed via 152 * LMEMBAR and shall be considered similar to stolen lmem. 153 */ 154 if (HAS_LMEM(i915) || HAS_LMEMBAR_SMEM_STOLEN(i915)) 155 return 0; 156 157 /* 158 * Verify that nothing else uses this physical address. Stolen 159 * memory should be reserved by the BIOS and hidden from the 160 * kernel. So if the region is already marked as busy, something 161 * is seriously wrong. 162 */ 163 r = devm_request_mem_region(i915->drm.dev, dsm->start, 164 resource_size(dsm), 165 "Graphics Stolen Memory"); 166 if (r == NULL) { 167 /* 168 * One more attempt but this time requesting region from 169 * start + 1, as we have seen that this resolves the region 170 * conflict with the PCI Bus. 171 * This is a BIOS w/a: Some BIOS wrap stolen in the root 172 * PCI bus, but have an off-by-one error. Hence retry the 173 * reservation starting from 1 instead of 0. 174 * There's also BIOS with off-by-one on the other end. 175 */ 176 r = devm_request_mem_region(i915->drm.dev, dsm->start + 1, 177 resource_size(dsm) - 2, 178 "Graphics Stolen Memory"); 179 /* 180 * GEN3 firmware likes to smash pci bridges into the stolen 181 * range. Apparently this works. 182 */ 183 if (!r && GRAPHICS_VER(i915) != 3) { 184 drm_err(&i915->drm, 185 "conflict detected with stolen region: %pR\n", 186 dsm); 187 188 return -EBUSY; 189 } 190 } 191 192 return 0; 193} 194 195static void i915_gem_cleanup_stolen(struct drm_i915_private *i915) 196{ 197 if (!drm_mm_initialized(&i915->mm.stolen)) 198 return; 199 200 drm_mm_takedown(&i915->mm.stolen); 201} 202 203static void g4x_get_stolen_reserved(struct drm_i915_private *i915, 204 struct intel_uncore *uncore, 205 resource_size_t *base, 206 resource_size_t *size) 207{ 208 u32 reg_val = intel_uncore_read(uncore, 209 IS_GM45(i915) ? 210 CTG_STOLEN_RESERVED : 211 ELK_STOLEN_RESERVED); 212 resource_size_t stolen_top = i915->dsm.stolen.end + 1; 213 214 drm_dbg(&i915->drm, "%s_STOLEN_RESERVED = %08x\n", 215 IS_GM45(i915) ? "CTG" : "ELK", reg_val); 216 217 if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0) 218 return; 219 220 /* 221 * Whether ILK really reuses the ELK register for this is unclear. 222 * Let's see if we catch anyone with this supposedly enabled on ILK. 223 */ 224 drm_WARN(&i915->drm, GRAPHICS_VER(i915) == 5, 225 "ILK stolen reserved found? 0x%08x\n", 226 reg_val); 227 228 if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK)) 229 return; 230 231 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16; 232 drm_WARN_ON(&i915->drm, 233 (reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base); 234 235 *size = stolen_top - *base; 236} 237 238static void gen6_get_stolen_reserved(struct drm_i915_private *i915, 239 struct intel_uncore *uncore, 240 resource_size_t *base, 241 resource_size_t *size) 242{ 243 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 244 245 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 246 247 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 248 return; 249 250 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 251 252 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) { 253 case GEN6_STOLEN_RESERVED_1M: 254 *size = 1024 * 1024; 255 break; 256 case GEN6_STOLEN_RESERVED_512K: 257 *size = 512 * 1024; 258 break; 259 case GEN6_STOLEN_RESERVED_256K: 260 *size = 256 * 1024; 261 break; 262 case GEN6_STOLEN_RESERVED_128K: 263 *size = 128 * 1024; 264 break; 265 default: 266 *size = 1024 * 1024; 267 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK); 268 } 269} 270 271static void vlv_get_stolen_reserved(struct drm_i915_private *i915, 272 struct intel_uncore *uncore, 273 resource_size_t *base, 274 resource_size_t *size) 275{ 276 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 277 resource_size_t stolen_top = i915->dsm.stolen.end + 1; 278 279 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 280 281 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 282 return; 283 284 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { 285 default: 286 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); 287 fallthrough; 288 case GEN7_STOLEN_RESERVED_1M: 289 *size = 1024 * 1024; 290 break; 291 } 292 293 /* 294 * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the 295 * reserved location as (top - size). 296 */ 297 *base = stolen_top - *size; 298} 299 300static void gen7_get_stolen_reserved(struct drm_i915_private *i915, 301 struct intel_uncore *uncore, 302 resource_size_t *base, 303 resource_size_t *size) 304{ 305 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 306 307 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 308 309 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 310 return; 311 312 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK; 313 314 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { 315 case GEN7_STOLEN_RESERVED_1M: 316 *size = 1024 * 1024; 317 break; 318 case GEN7_STOLEN_RESERVED_256K: 319 *size = 256 * 1024; 320 break; 321 default: 322 *size = 1024 * 1024; 323 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); 324 } 325} 326 327static void chv_get_stolen_reserved(struct drm_i915_private *i915, 328 struct intel_uncore *uncore, 329 resource_size_t *base, 330 resource_size_t *size) 331{ 332 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 333 334 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 335 336 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 337 return; 338 339 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 340 341 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { 342 case GEN8_STOLEN_RESERVED_1M: 343 *size = 1024 * 1024; 344 break; 345 case GEN8_STOLEN_RESERVED_2M: 346 *size = 2 * 1024 * 1024; 347 break; 348 case GEN8_STOLEN_RESERVED_4M: 349 *size = 4 * 1024 * 1024; 350 break; 351 case GEN8_STOLEN_RESERVED_8M: 352 *size = 8 * 1024 * 1024; 353 break; 354 default: 355 *size = 8 * 1024 * 1024; 356 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); 357 } 358} 359 360static void bdw_get_stolen_reserved(struct drm_i915_private *i915, 361 struct intel_uncore *uncore, 362 resource_size_t *base, 363 resource_size_t *size) 364{ 365 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 366 resource_size_t stolen_top = i915->dsm.stolen.end + 1; 367 368 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 369 370 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 371 return; 372 373 if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK)) 374 return; 375 376 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 377 *size = stolen_top - *base; 378} 379 380static void icl_get_stolen_reserved(struct drm_i915_private *i915, 381 struct intel_uncore *uncore, 382 resource_size_t *base, 383 resource_size_t *size) 384{ 385 u64 reg_val = intel_uncore_read64(uncore, GEN6_STOLEN_RESERVED); 386 387 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val); 388 389 /* Wa_14019821291 */ 390 if (MEDIA_VER_FULL(i915) == IP_VER(13, 0)) { 391 /* 392 * This workaround is primarily implemented by the BIOS. We 393 * just need to figure out whether the BIOS has applied the 394 * workaround (meaning the programmed address falls within 395 * the DSM) and, if so, reserve that part of the DSM to 396 * prevent accidental reuse. The DSM location should be just 397 * below the WOPCM. 398 */ 399 u64 gscpsmi_base = intel_uncore_read64_2x32(uncore, 400 MTL_GSCPSMI_BASEADDR_LSB, 401 MTL_GSCPSMI_BASEADDR_MSB); 402 if (gscpsmi_base >= i915->dsm.stolen.start && 403 gscpsmi_base < i915->dsm.stolen.end) { 404 *base = gscpsmi_base; 405 *size = i915->dsm.stolen.end - gscpsmi_base; 406 return; 407 } 408 } 409 410 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { 411 case GEN8_STOLEN_RESERVED_1M: 412 *size = 1024 * 1024; 413 break; 414 case GEN8_STOLEN_RESERVED_2M: 415 *size = 2 * 1024 * 1024; 416 break; 417 case GEN8_STOLEN_RESERVED_4M: 418 *size = 4 * 1024 * 1024; 419 break; 420 case GEN8_STOLEN_RESERVED_8M: 421 *size = 8 * 1024 * 1024; 422 break; 423 default: 424 *size = 8 * 1024 * 1024; 425 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); 426 } 427 428 if (HAS_LMEMBAR_SMEM_STOLEN(i915)) 429 /* the base is initialized to stolen top so subtract size to get base */ 430 *base -= *size; 431 else 432 *base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK; 433} 434 435/* 436 * Initialize i915->dsm.reserved to contain the reserved space within the Data 437 * Stolen Memory. This is a range on the top of DSM that is reserved, not to 438 * be used by driver, so must be excluded from the region passed to the 439 * allocator later. In the spec this is also called as WOPCM. 440 * 441 * Our expectation is that the reserved space is at the top of the stolen 442 * region, as it has been the case for every platform, and *never* at the 443 * bottom, so the calculation here can be simplified. 444 */ 445static int init_reserved_stolen(struct drm_i915_private *i915) 446{ 447 struct intel_uncore *uncore = &i915->uncore; 448 resource_size_t reserved_base, stolen_top; 449 resource_size_t reserved_size; 450 int ret = 0; 451 452 stolen_top = i915->dsm.stolen.end + 1; 453 reserved_base = stolen_top; 454 reserved_size = 0; 455 456 if (GRAPHICS_VER(i915) >= 11) { 457 icl_get_stolen_reserved(i915, uncore, 458 &reserved_base, &reserved_size); 459 } else if (GRAPHICS_VER(i915) >= 8) { 460 if (IS_LP(i915)) 461 chv_get_stolen_reserved(i915, uncore, 462 &reserved_base, &reserved_size); 463 else 464 bdw_get_stolen_reserved(i915, uncore, 465 &reserved_base, &reserved_size); 466 } else if (GRAPHICS_VER(i915) >= 7) { 467 if (IS_VALLEYVIEW(i915)) 468 vlv_get_stolen_reserved(i915, uncore, 469 &reserved_base, &reserved_size); 470 else 471 gen7_get_stolen_reserved(i915, uncore, 472 &reserved_base, &reserved_size); 473 } else if (GRAPHICS_VER(i915) >= 6) { 474 gen6_get_stolen_reserved(i915, uncore, 475 &reserved_base, &reserved_size); 476 } else if (GRAPHICS_VER(i915) >= 5 || IS_G4X(i915)) { 477 g4x_get_stolen_reserved(i915, uncore, 478 &reserved_base, &reserved_size); 479 } 480 481 /* No reserved stolen */ 482 if (reserved_base == stolen_top) 483 goto bail_out; 484 485 if (!reserved_base) { 486 drm_err(&i915->drm, 487 "inconsistent reservation %pa + %pa; ignoring\n", 488 &reserved_base, &reserved_size); 489 ret = -EINVAL; 490 goto bail_out; 491 } 492 493 i915->dsm.reserved = DEFINE_RES_MEM(reserved_base, reserved_size); 494 495 if (!resource_contains(&i915->dsm.stolen, &i915->dsm.reserved)) { 496 drm_err(&i915->drm, 497 "Stolen reserved area %pR outside stolen memory %pR\n", 498 &i915->dsm.reserved, &i915->dsm.stolen); 499 ret = -EINVAL; 500 goto bail_out; 501 } 502 503 return 0; 504 505bail_out: 506 i915->dsm.reserved = DEFINE_RES_MEM(reserved_base, 0); 507 508 return ret; 509} 510 511static int i915_gem_init_stolen(struct intel_memory_region *mem) 512{ 513 struct drm_i915_private *i915 = mem->i915; 514 515 mutex_init(&i915->mm.stolen_lock); 516 517 if (intel_vgpu_active(i915)) { 518 drm_notice(&i915->drm, 519 "%s, disabling use of stolen memory\n", 520 "iGVT-g active"); 521 return -ENOSPC; 522 } 523 524 if (i915_vtd_active(i915) && GRAPHICS_VER(i915) < 8) { 525 drm_notice(&i915->drm, 526 "%s, disabling use of stolen memory\n", 527 "DMAR active"); 528 return -ENOSPC; 529 } 530 531 if (adjust_stolen(i915, &mem->region)) 532 return -ENOSPC; 533 534 if (request_smem_stolen(i915, &mem->region)) 535 return -ENOSPC; 536 537 i915->dsm.stolen = mem->region; 538 539 if (init_reserved_stolen(i915)) 540 return -ENOSPC; 541 542 /* Exclude the reserved region from driver use */ 543 mem->region.end = i915->dsm.reserved.start - 1; 544 mem->io = DEFINE_RES_MEM(mem->io.start, 545 min(resource_size(&mem->io), 546 resource_size(&mem->region))); 547 548 i915->dsm.usable_size = resource_size(&mem->region); 549 550 drm_dbg(&i915->drm, 551 "Memory reserved for graphics device: %lluK, usable: %lluK\n", 552 (u64)resource_size(&i915->dsm.stolen) >> 10, 553 (u64)i915->dsm.usable_size >> 10); 554 555 if (i915->dsm.usable_size == 0) 556 return -ENOSPC; 557 558 /* Basic memrange allocator for stolen space. */ 559 drm_mm_init(&i915->mm.stolen, 0, i915->dsm.usable_size); 560 561 /* 562 * Access to stolen lmem beyond certain size for MTL A0 stepping 563 * would crash the machine. Disable stolen lmem for userspace access 564 * by setting usable_size to zero. 565 */ 566 if (IS_METEORLAKE(i915) && INTEL_REVID(i915) == 0x0) 567 i915->dsm.usable_size = 0; 568 569 return 0; 570} 571 572static void dbg_poison(struct i915_ggtt *ggtt, 573 dma_addr_t addr, resource_size_t size, 574 u8 x) 575{ 576#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) 577 if (!drm_mm_node_allocated(&ggtt->error_capture)) 578 return; 579 580 if (ggtt->vm.bind_async_flags & I915_VMA_GLOBAL_BIND) 581 return; /* beware stop_machine() inversion */ 582 583 GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE)); 584 585 mutex_lock(&ggtt->error_mutex); 586 while (size) { 587 void __iomem *s; 588 589 ggtt->vm.insert_page(&ggtt->vm, addr, 590 ggtt->error_capture.start, 591 i915_gem_get_pat_index(ggtt->vm.i915, 592 I915_CACHE_NONE), 593 0); 594 mb(); 595 596 s = io_mapping_map_wc(&ggtt->iomap, 597 ggtt->error_capture.start, 598 PAGE_SIZE); 599 memset_io(s, x, PAGE_SIZE); 600 io_mapping_unmap(s); 601 602 addr += PAGE_SIZE; 603 size -= PAGE_SIZE; 604 } 605 mb(); 606 ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE); 607 mutex_unlock(&ggtt->error_mutex); 608#endif 609} 610 611static struct sg_table * 612i915_pages_create_for_stolen(struct drm_device *dev, 613 resource_size_t offset, resource_size_t size) 614{ 615 struct drm_i915_private *i915 = to_i915(dev); 616 struct sg_table *st; 617 struct scatterlist *sg; 618 619 GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm.stolen))); 620 621 /* We hide that we have no struct page backing our stolen object 622 * by wrapping the contiguous physical allocation with a fake 623 * dma mapping in a single scatterlist. 624 */ 625 626 st = kmalloc(sizeof(*st), GFP_KERNEL); 627 if (st == NULL) 628 return ERR_PTR(-ENOMEM); 629 630 if (sg_alloc_table(st, 1, GFP_KERNEL)) { 631 kfree(st); 632 return ERR_PTR(-ENOMEM); 633 } 634 635 sg = st->sgl; 636 sg->offset = 0; 637 sg->length = size; 638 639 sg_dma_address(sg) = (dma_addr_t)i915->dsm.stolen.start + offset; 640 sg_dma_len(sg) = size; 641 642 return st; 643} 644 645static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) 646{ 647 struct drm_i915_private *i915 = to_i915(obj->base.dev); 648 struct sg_table *pages = 649 i915_pages_create_for_stolen(obj->base.dev, 650 obj->stolen->start, 651 obj->stolen->size); 652 if (IS_ERR(pages)) 653 return PTR_ERR(pages); 654 655 dbg_poison(to_gt(i915)->ggtt, 656 sg_dma_address(pages->sgl), 657 sg_dma_len(pages->sgl), 658 POISON_INUSE); 659 660 __i915_gem_object_set_pages(obj, pages); 661 662 return 0; 663} 664 665static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj, 666 struct sg_table *pages) 667{ 668 struct drm_i915_private *i915 = to_i915(obj->base.dev); 669 /* Should only be called from i915_gem_object_release_stolen() */ 670 671 dbg_poison(to_gt(i915)->ggtt, 672 sg_dma_address(pages->sgl), 673 sg_dma_len(pages->sgl), 674 POISON_FREE); 675 676 sg_free_table(pages); 677 kfree(pages); 678} 679 680static void 681i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) 682{ 683 struct drm_i915_private *i915 = to_i915(obj->base.dev); 684 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen); 685 686 GEM_BUG_ON(!stolen); 687 i915_gem_stolen_remove_node(i915, stolen); 688 kfree(stolen); 689 690 i915_gem_object_release_memory_region(obj); 691} 692 693static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { 694 .name = "i915_gem_object_stolen", 695 .get_pages = i915_gem_object_get_pages_stolen, 696 .put_pages = i915_gem_object_put_pages_stolen, 697 .release = i915_gem_object_release_stolen, 698}; 699 700static int __i915_gem_object_create_stolen(struct intel_memory_region *mem, 701 struct drm_i915_gem_object *obj, 702 struct drm_mm_node *stolen) 703{ 704 static struct lock_class_key lock_class; 705 unsigned int cache_level; 706 unsigned int flags; 707 int err; 708 709 /* 710 * Stolen objects are always physically contiguous since we just 711 * allocate one big block underneath using the drm_mm range allocator. 712 */ 713 flags = I915_BO_ALLOC_CONTIGUOUS; 714 715 drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size); 716 i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class, flags); 717 718 obj->stolen = stolen; 719 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; 720 cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE; 721 i915_gem_object_set_cache_coherency(obj, cache_level); 722 723 if (WARN_ON(!i915_gem_object_trylock(obj, NULL))) 724 return -EBUSY; 725 726 i915_gem_object_init_memory_region(obj, mem); 727 728 err = i915_gem_object_pin_pages(obj); 729 if (err) 730 i915_gem_object_release_memory_region(obj); 731 i915_gem_object_unlock(obj); 732 733 return err; 734} 735 736static int _i915_gem_object_stolen_init(struct intel_memory_region *mem, 737 struct drm_i915_gem_object *obj, 738 resource_size_t offset, 739 resource_size_t size, 740 resource_size_t page_size, 741 unsigned int flags) 742{ 743 struct drm_i915_private *i915 = mem->i915; 744 struct drm_mm_node *stolen; 745 int ret; 746 747 if (!drm_mm_initialized(&i915->mm.stolen)) 748 return -ENODEV; 749 750 if (size == 0) 751 return -EINVAL; 752 753 /* 754 * With discrete devices, where we lack a mappable aperture there is no 755 * possible way to ever access this memory on the CPU side. 756 */ 757 if (mem->type == INTEL_MEMORY_STOLEN_LOCAL && !resource_size(&mem->io) && 758 !(flags & I915_BO_ALLOC_GPU_ONLY)) 759 return -ENOSPC; 760 761 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 762 if (!stolen) 763 return -ENOMEM; 764 765 if (offset != I915_BO_INVALID_OFFSET) { 766 drm_dbg(&i915->drm, 767 "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n", 768 &offset, &size); 769 770 stolen->start = offset; 771 stolen->size = size; 772 mutex_lock(&i915->mm.stolen_lock); 773 ret = drm_mm_reserve_node(&i915->mm.stolen, stolen); 774 mutex_unlock(&i915->mm.stolen_lock); 775 } else { 776 ret = i915_gem_stolen_insert_node(i915, stolen, size, 777 mem->min_page_size); 778 } 779 if (ret) 780 goto err_free; 781 782 ret = __i915_gem_object_create_stolen(mem, obj, stolen); 783 if (ret) 784 goto err_remove; 785 786 return 0; 787 788err_remove: 789 i915_gem_stolen_remove_node(i915, stolen); 790err_free: 791 kfree(stolen); 792 return ret; 793} 794 795struct drm_i915_gem_object * 796i915_gem_object_create_stolen(struct drm_i915_private *i915, 797 resource_size_t size) 798{ 799 return i915_gem_object_create_region(i915->mm.stolen_region, size, 0, 0); 800} 801 802static int init_stolen_smem(struct intel_memory_region *mem) 803{ 804 int err; 805 806 /* 807 * Initialise stolen early so that we may reserve preallocated 808 * objects for the BIOS to KMS transition. 809 */ 810 err = i915_gem_init_stolen(mem); 811 if (err) 812 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); 813 814 return 0; 815} 816 817static int release_stolen_smem(struct intel_memory_region *mem) 818{ 819 i915_gem_cleanup_stolen(mem->i915); 820 return 0; 821} 822 823static const struct intel_memory_region_ops i915_region_stolen_smem_ops = { 824 .init = init_stolen_smem, 825 .release = release_stolen_smem, 826 .init_object = _i915_gem_object_stolen_init, 827}; 828 829static int init_stolen_lmem(struct intel_memory_region *mem) 830{ 831 int err; 832 833 if (GEM_WARN_ON(resource_size(&mem->region) == 0)) 834 return 0; 835 836 err = i915_gem_init_stolen(mem); 837 if (err) { 838 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); 839 return 0; 840 } 841 842 if (resource_size(&mem->io) && 843 !io_mapping_init_wc(&mem->iomap, mem->io.start, resource_size(&mem->io))) 844 goto err_cleanup; 845 846 return 0; 847 848err_cleanup: 849 i915_gem_cleanup_stolen(mem->i915); 850 return err; 851} 852 853static int release_stolen_lmem(struct intel_memory_region *mem) 854{ 855 if (resource_size(&mem->io)) 856 io_mapping_fini(&mem->iomap); 857 i915_gem_cleanup_stolen(mem->i915); 858 return 0; 859} 860 861static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = { 862 .init = init_stolen_lmem, 863 .release = release_stolen_lmem, 864 .init_object = _i915_gem_object_stolen_init, 865}; 866 867static int mtl_get_gms_size(struct intel_uncore *uncore) 868{ 869 u16 ggc, gms; 870 871 ggc = intel_uncore_read16(uncore, GGC); 872 873 /* check GGMS, should be fixed 0x3 (8MB) */ 874 if ((ggc & GGMS_MASK) != GGMS_MASK) 875 return -EIO; 876 877 /* return valid GMS value, -EIO if invalid */ 878 gms = REG_FIELD_GET(GMS_MASK, ggc); 879 switch (gms) { 880 case 0x0 ... 0x04: 881 return gms * 32; 882 case 0xf0 ... 0xfe: 883 return (gms - 0xf0 + 1) * 4; 884 default: 885 MISSING_CASE(gms); 886 return -EIO; 887 } 888} 889 890struct intel_memory_region * 891i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type, 892 u16 instance) 893{ 894 struct intel_uncore *uncore = &i915->uncore; 895 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); 896 resource_size_t dsm_size, dsm_base, lmem_size; 897 struct intel_memory_region *mem; 898 resource_size_t io_start, io_size; 899 resource_size_t min_page_size; 900 int ret; 901 902 if (WARN_ON_ONCE(instance)) 903 return ERR_PTR(-ENODEV); 904 905 if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR)) 906 return ERR_PTR(-ENXIO); 907 908 if (HAS_LMEMBAR_SMEM_STOLEN(i915) || IS_DG1(i915)) { 909 lmem_size = pci_resource_len(pdev, GEN12_LMEM_BAR); 910 } else { 911 resource_size_t lmem_range; 912 913 lmem_range = intel_gt_mcr_read_any(to_gt(i915), XEHP_TILE0_ADDR_RANGE) & 0xFFFF; 914 lmem_size = lmem_range >> XEHP_TILE_LMEM_RANGE_SHIFT; 915 lmem_size *= SZ_1G; 916 } 917 918 if (HAS_LMEMBAR_SMEM_STOLEN(i915)) { 919 /* 920 * MTL dsm size is in GGC register. 921 * Also MTL uses offset to GSMBASE in ptes, so i915 922 * uses dsm_base = 8MBs to setup stolen region, since 923 * DSMBASE = GSMBASE + 8MB. 924 */ 925 ret = mtl_get_gms_size(uncore); 926 if (ret < 0) { 927 drm_err(&i915->drm, "invalid MTL GGC register setting\n"); 928 return ERR_PTR(ret); 929 } 930 931 dsm_base = SZ_8M; 932 dsm_size = (resource_size_t)(ret * SZ_1M); 933 934 GEM_BUG_ON(pci_resource_len(pdev, GEN12_LMEM_BAR) != SZ_256M); 935 GEM_BUG_ON((dsm_base + dsm_size) > lmem_size); 936 } else { 937 /* Use DSM base address instead for stolen memory */ 938 dsm_base = intel_uncore_read64(uncore, GEN6_DSMBASE) & GEN11_BDSM_MASK; 939 if (WARN_ON(lmem_size < dsm_base)) 940 return ERR_PTR(-ENODEV); 941 dsm_size = ALIGN_DOWN(lmem_size - dsm_base, SZ_1M); 942 } 943 944 if (i915_direct_stolen_access(i915)) { 945 drm_dbg(&i915->drm, "Using direct DSM access\n"); 946 io_start = intel_uncore_read64(uncore, GEN6_DSMBASE) & GEN11_BDSM_MASK; 947 io_size = dsm_size; 948 } else if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) { 949 io_start = 0; 950 io_size = 0; 951 } else { 952 io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + dsm_base; 953 io_size = dsm_size; 954 } 955 956 min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K : 957 I915_GTT_PAGE_SIZE_4K; 958 959 mem = intel_memory_region_create(i915, dsm_base, dsm_size, 960 min_page_size, 961 io_start, io_size, 962 type, instance, 963 &i915_region_stolen_lmem_ops); 964 if (IS_ERR(mem)) 965 return mem; 966 967 intel_memory_region_set_name(mem, "stolen-local"); 968 969 mem->private = true; 970 971 return mem; 972} 973 974struct intel_memory_region* 975i915_gem_stolen_smem_setup(struct drm_i915_private *i915, u16 type, 976 u16 instance) 977{ 978 struct intel_memory_region *mem; 979 980 mem = intel_memory_region_create(i915, 981 intel_graphics_stolen_res.start, 982 resource_size(&intel_graphics_stolen_res), 983 PAGE_SIZE, 0, 0, type, instance, 984 &i915_region_stolen_smem_ops); 985 if (IS_ERR(mem)) 986 return mem; 987 988 intel_memory_region_set_name(mem, "stolen-system"); 989 990 mem->private = true; 991 992 return mem; 993} 994 995bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj) 996{ 997 return obj->ops == &i915_gem_object_stolen_ops; 998} 999 1000bool i915_gem_stolen_initialized(const struct drm_i915_private *i915) 1001{ 1002 return drm_mm_initialized(&i915->mm.stolen); 1003} 1004 1005u64 i915_gem_stolen_area_address(const struct drm_i915_private *i915) 1006{ 1007 return i915->dsm.stolen.start; 1008} 1009 1010u64 i915_gem_stolen_area_size(const struct drm_i915_private *i915) 1011{ 1012 return resource_size(&i915->dsm.stolen); 1013} 1014 1015u64 i915_gem_stolen_node_address(const struct drm_i915_private *i915, 1016 const struct drm_mm_node *node) 1017{ 1018 return i915->dsm.stolen.start + i915_gem_stolen_node_offset(node); 1019} 1020 1021bool i915_gem_stolen_node_allocated(const struct drm_mm_node *node) 1022{ 1023 return drm_mm_node_allocated(node); 1024} 1025 1026u64 i915_gem_stolen_node_offset(const struct drm_mm_node *node) 1027{ 1028 return node->start; 1029} 1030 1031u64 i915_gem_stolen_node_size(const struct drm_mm_node *node) 1032{ 1033 return node->size; 1034} 1035