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 = 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 } 141 142 static 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 } 194 195 static 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 } 202 203 static 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 } 237 238 static 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 } 270 271 static 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 } 299 300 static 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 } 326 327 static 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 } 359 360 static 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 } 379 380 static 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 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { 390 case GEN8_STOLEN_RESERVED_1M: 391 *size = 1024 * 1024; 392 break; 393 case GEN8_STOLEN_RESERVED_2M: 394 *size = 2 * 1024 * 1024; 395 break; 396 case GEN8_STOLEN_RESERVED_4M: 397 *size = 4 * 1024 * 1024; 398 break; 399 case GEN8_STOLEN_RESERVED_8M: 400 *size = 8 * 1024 * 1024; 401 break; 402 default: 403 *size = 8 * 1024 * 1024; 404 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); 405 } 406 407 if (HAS_LMEMBAR_SMEM_STOLEN(i915)) 408 /* the base is initialized to stolen top so subtract size to get base */ 409 *base -= *size; 410 else 411 *base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK; 412 } 413 414 /* 415 * Initialize i915->dsm.reserved to contain the reserved space within the Data 416 * Stolen Memory. This is a range on the top of DSM that is reserved, not to 417 * be used by driver, so must be excluded from the region passed to the 418 * allocator later. In the spec this is also called as WOPCM. 419 * 420 * Our expectation is that the reserved space is at the top of the stolen 421 * region, as it has been the case for every platform, and *never* at the 422 * bottom, so the calculation here can be simplified. 423 */ 424 static int init_reserved_stolen(struct drm_i915_private *i915) 425 { 426 struct intel_uncore *uncore = &i915->uncore; 427 resource_size_t reserved_base, stolen_top; 428 resource_size_t reserved_size; 429 int ret = 0; 430 431 stolen_top = i915->dsm.stolen.end + 1; 432 reserved_base = stolen_top; 433 reserved_size = 0; 434 435 if (GRAPHICS_VER(i915) >= 11) { 436 icl_get_stolen_reserved(i915, uncore, 437 &reserved_base, &reserved_size); 438 } else if (GRAPHICS_VER(i915) >= 8) { 439 if (IS_LP(i915)) 440 chv_get_stolen_reserved(i915, uncore, 441 &reserved_base, &reserved_size); 442 else 443 bdw_get_stolen_reserved(i915, uncore, 444 &reserved_base, &reserved_size); 445 } else if (GRAPHICS_VER(i915) >= 7) { 446 if (IS_VALLEYVIEW(i915)) 447 vlv_get_stolen_reserved(i915, uncore, 448 &reserved_base, &reserved_size); 449 else 450 gen7_get_stolen_reserved(i915, uncore, 451 &reserved_base, &reserved_size); 452 } else if (GRAPHICS_VER(i915) >= 6) { 453 gen6_get_stolen_reserved(i915, uncore, 454 &reserved_base, &reserved_size); 455 } else if (GRAPHICS_VER(i915) >= 5 || IS_G4X(i915)) { 456 g4x_get_stolen_reserved(i915, uncore, 457 &reserved_base, &reserved_size); 458 } 459 460 /* No reserved stolen */ 461 if (reserved_base == stolen_top) 462 goto bail_out; 463 464 if (!reserved_base) { 465 drm_err(&i915->drm, 466 "inconsistent reservation %pa + %pa; ignoring\n", 467 &reserved_base, &reserved_size); 468 ret = -EINVAL; 469 goto bail_out; 470 } 471 472 i915->dsm.reserved = DEFINE_RES_MEM(reserved_base, reserved_size); 473 474 if (!resource_contains(&i915->dsm.stolen, &i915->dsm.reserved)) { 475 drm_err(&i915->drm, 476 "Stolen reserved area %pR outside stolen memory %pR\n", 477 &i915->dsm.reserved, &i915->dsm.stolen); 478 ret = -EINVAL; 479 goto bail_out; 480 } 481 482 return 0; 483 484 bail_out: 485 i915->dsm.reserved = DEFINE_RES_MEM(reserved_base, 0); 486 487 return ret; 488 } 489 490 static int i915_gem_init_stolen(struct intel_memory_region *mem) 491 { 492 struct drm_i915_private *i915 = mem->i915; 493 494 mutex_init(&i915->mm.stolen_lock); 495 496 if (intel_vgpu_active(i915)) { 497 drm_notice(&i915->drm, 498 "%s, disabling use of stolen memory\n", 499 "iGVT-g active"); 500 return -ENOSPC; 501 } 502 503 if (i915_vtd_active(i915) && GRAPHICS_VER(i915) < 8) { 504 drm_notice(&i915->drm, 505 "%s, disabling use of stolen memory\n", 506 "DMAR active"); 507 return -ENOSPC; 508 } 509 510 if (adjust_stolen(i915, &mem->region)) 511 return -ENOSPC; 512 513 if (request_smem_stolen(i915, &mem->region)) 514 return -ENOSPC; 515 516 i915->dsm.stolen = mem->region; 517 518 if (init_reserved_stolen(i915)) 519 return -ENOSPC; 520 521 /* Exclude the reserved region from driver use */ 522 mem->region.end = i915->dsm.reserved.start - 1; 523 mem->io_size = min(mem->io_size, resource_size(&mem->region)); 524 525 i915->dsm.usable_size = resource_size(&mem->region); 526 527 drm_dbg(&i915->drm, 528 "Memory reserved for graphics device: %lluK, usable: %lluK\n", 529 (u64)resource_size(&i915->dsm.stolen) >> 10, 530 (u64)i915->dsm.usable_size >> 10); 531 532 if (i915->dsm.usable_size == 0) 533 return -ENOSPC; 534 535 /* Basic memrange allocator for stolen space. */ 536 drm_mm_init(&i915->mm.stolen, 0, i915->dsm.usable_size); 537 538 /* 539 * Access to stolen lmem beyond certain size for MTL A0 stepping 540 * would crash the machine. Disable stolen lmem for userspace access 541 * by setting usable_size to zero. 542 */ 543 if (IS_METEORLAKE(i915) && INTEL_REVID(i915) == 0x0) 544 i915->dsm.usable_size = 0; 545 546 return 0; 547 } 548 549 static void dbg_poison(struct i915_ggtt *ggtt, 550 dma_addr_t addr, resource_size_t size, 551 u8 x) 552 { 553 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) 554 if (!drm_mm_node_allocated(&ggtt->error_capture)) 555 return; 556 557 if (ggtt->vm.bind_async_flags & I915_VMA_GLOBAL_BIND) 558 return; /* beware stop_machine() inversion */ 559 560 GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE)); 561 562 mutex_lock(&ggtt->error_mutex); 563 while (size) { 564 void __iomem *s; 565 566 ggtt->vm.insert_page(&ggtt->vm, addr, 567 ggtt->error_capture.start, 568 I915_CACHE_NONE, 0); 569 mb(); 570 571 s = io_mapping_map_wc(&ggtt->iomap, 572 ggtt->error_capture.start, 573 PAGE_SIZE); 574 memset_io(s, x, PAGE_SIZE); 575 io_mapping_unmap(s); 576 577 addr += PAGE_SIZE; 578 size -= PAGE_SIZE; 579 } 580 mb(); 581 ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE); 582 mutex_unlock(&ggtt->error_mutex); 583 #endif 584 } 585 586 static struct sg_table * 587 i915_pages_create_for_stolen(struct drm_device *dev, 588 resource_size_t offset, resource_size_t size) 589 { 590 struct drm_i915_private *i915 = to_i915(dev); 591 struct sg_table *st; 592 struct scatterlist *sg; 593 594 GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm.stolen))); 595 596 /* We hide that we have no struct page backing our stolen object 597 * by wrapping the contiguous physical allocation with a fake 598 * dma mapping in a single scatterlist. 599 */ 600 601 st = kmalloc(sizeof(*st), GFP_KERNEL); 602 if (st == NULL) 603 return ERR_PTR(-ENOMEM); 604 605 if (sg_alloc_table(st, 1, GFP_KERNEL)) { 606 kfree(st); 607 return ERR_PTR(-ENOMEM); 608 } 609 610 sg = st->sgl; 611 sg->offset = 0; 612 sg->length = size; 613 614 sg_dma_address(sg) = (dma_addr_t)i915->dsm.stolen.start + offset; 615 sg_dma_len(sg) = size; 616 617 return st; 618 } 619 620 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) 621 { 622 struct drm_i915_private *i915 = to_i915(obj->base.dev); 623 struct sg_table *pages = 624 i915_pages_create_for_stolen(obj->base.dev, 625 obj->stolen->start, 626 obj->stolen->size); 627 if (IS_ERR(pages)) 628 return PTR_ERR(pages); 629 630 dbg_poison(to_gt(i915)->ggtt, 631 sg_dma_address(pages->sgl), 632 sg_dma_len(pages->sgl), 633 POISON_INUSE); 634 635 __i915_gem_object_set_pages(obj, pages); 636 637 return 0; 638 } 639 640 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj, 641 struct sg_table *pages) 642 { 643 struct drm_i915_private *i915 = to_i915(obj->base.dev); 644 /* Should only be called from i915_gem_object_release_stolen() */ 645 646 dbg_poison(to_gt(i915)->ggtt, 647 sg_dma_address(pages->sgl), 648 sg_dma_len(pages->sgl), 649 POISON_FREE); 650 651 sg_free_table(pages); 652 kfree(pages); 653 } 654 655 static void 656 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) 657 { 658 struct drm_i915_private *i915 = to_i915(obj->base.dev); 659 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen); 660 661 GEM_BUG_ON(!stolen); 662 i915_gem_stolen_remove_node(i915, stolen); 663 kfree(stolen); 664 665 i915_gem_object_release_memory_region(obj); 666 } 667 668 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { 669 .name = "i915_gem_object_stolen", 670 .get_pages = i915_gem_object_get_pages_stolen, 671 .put_pages = i915_gem_object_put_pages_stolen, 672 .release = i915_gem_object_release_stolen, 673 }; 674 675 static int __i915_gem_object_create_stolen(struct intel_memory_region *mem, 676 struct drm_i915_gem_object *obj, 677 struct drm_mm_node *stolen) 678 { 679 static struct lock_class_key lock_class; 680 unsigned int cache_level; 681 unsigned int flags; 682 int err; 683 684 /* 685 * Stolen objects are always physically contiguous since we just 686 * allocate one big block underneath using the drm_mm range allocator. 687 */ 688 flags = I915_BO_ALLOC_CONTIGUOUS; 689 690 drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size); 691 i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class, flags); 692 693 obj->stolen = stolen; 694 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; 695 cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE; 696 i915_gem_object_set_cache_coherency(obj, cache_level); 697 698 if (WARN_ON(!i915_gem_object_trylock(obj, NULL))) 699 return -EBUSY; 700 701 i915_gem_object_init_memory_region(obj, mem); 702 703 err = i915_gem_object_pin_pages(obj); 704 if (err) 705 i915_gem_object_release_memory_region(obj); 706 i915_gem_object_unlock(obj); 707 708 return err; 709 } 710 711 static int _i915_gem_object_stolen_init(struct intel_memory_region *mem, 712 struct drm_i915_gem_object *obj, 713 resource_size_t offset, 714 resource_size_t size, 715 resource_size_t page_size, 716 unsigned int flags) 717 { 718 struct drm_i915_private *i915 = mem->i915; 719 struct drm_mm_node *stolen; 720 int ret; 721 722 if (!drm_mm_initialized(&i915->mm.stolen)) 723 return -ENODEV; 724 725 if (size == 0) 726 return -EINVAL; 727 728 /* 729 * With discrete devices, where we lack a mappable aperture there is no 730 * possible way to ever access this memory on the CPU side. 731 */ 732 if (mem->type == INTEL_MEMORY_STOLEN_LOCAL && !mem->io_size && 733 !(flags & I915_BO_ALLOC_GPU_ONLY)) 734 return -ENOSPC; 735 736 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 737 if (!stolen) 738 return -ENOMEM; 739 740 if (offset != I915_BO_INVALID_OFFSET) { 741 drm_dbg(&i915->drm, 742 "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n", 743 &offset, &size); 744 745 stolen->start = offset; 746 stolen->size = size; 747 mutex_lock(&i915->mm.stolen_lock); 748 ret = drm_mm_reserve_node(&i915->mm.stolen, stolen); 749 mutex_unlock(&i915->mm.stolen_lock); 750 } else { 751 ret = i915_gem_stolen_insert_node(i915, stolen, size, 752 mem->min_page_size); 753 } 754 if (ret) 755 goto err_free; 756 757 ret = __i915_gem_object_create_stolen(mem, obj, stolen); 758 if (ret) 759 goto err_remove; 760 761 return 0; 762 763 err_remove: 764 i915_gem_stolen_remove_node(i915, stolen); 765 err_free: 766 kfree(stolen); 767 return ret; 768 } 769 770 struct drm_i915_gem_object * 771 i915_gem_object_create_stolen(struct drm_i915_private *i915, 772 resource_size_t size) 773 { 774 return i915_gem_object_create_region(i915->mm.stolen_region, size, 0, 0); 775 } 776 777 static int init_stolen_smem(struct intel_memory_region *mem) 778 { 779 int err; 780 781 /* 782 * Initialise stolen early so that we may reserve preallocated 783 * objects for the BIOS to KMS transition. 784 */ 785 err = i915_gem_init_stolen(mem); 786 if (err) 787 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); 788 789 return 0; 790 } 791 792 static int release_stolen_smem(struct intel_memory_region *mem) 793 { 794 i915_gem_cleanup_stolen(mem->i915); 795 return 0; 796 } 797 798 static const struct intel_memory_region_ops i915_region_stolen_smem_ops = { 799 .init = init_stolen_smem, 800 .release = release_stolen_smem, 801 .init_object = _i915_gem_object_stolen_init, 802 }; 803 804 static int init_stolen_lmem(struct intel_memory_region *mem) 805 { 806 struct drm_i915_private *i915 = mem->i915; 807 int err; 808 809 if (GEM_WARN_ON(resource_size(&mem->region) == 0)) 810 return 0; 811 812 err = i915_gem_init_stolen(mem); 813 if (err) { 814 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); 815 return 0; 816 } 817 818 if (mem->io_size && 819 !io_mapping_init_wc(&mem->iomap, mem->io_start, mem->io_size)) 820 goto err_cleanup; 821 822 drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n", 823 &mem->io_start); 824 drm_dbg(&i915->drm, "Stolen Local DSM base: %pa\n", &mem->region.start); 825 826 return 0; 827 828 err_cleanup: 829 i915_gem_cleanup_stolen(mem->i915); 830 return err; 831 } 832 833 static int release_stolen_lmem(struct intel_memory_region *mem) 834 { 835 if (mem->io_size) 836 io_mapping_fini(&mem->iomap); 837 i915_gem_cleanup_stolen(mem->i915); 838 return 0; 839 } 840 841 static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = { 842 .init = init_stolen_lmem, 843 .release = release_stolen_lmem, 844 .init_object = _i915_gem_object_stolen_init, 845 }; 846 847 static int mtl_get_gms_size(struct intel_uncore *uncore) 848 { 849 u16 ggc, gms; 850 851 ggc = intel_uncore_read16(uncore, GGC); 852 853 /* check GGMS, should be fixed 0x3 (8MB) */ 854 if ((ggc & GGMS_MASK) != GGMS_MASK) 855 return -EIO; 856 857 /* return valid GMS value, -EIO if invalid */ 858 gms = REG_FIELD_GET(GMS_MASK, ggc); 859 switch (gms) { 860 case 0x0 ... 0x04: 861 return gms * 32; 862 case 0xf0 ... 0xfe: 863 return (gms - 0xf0 + 1) * 4; 864 default: 865 MISSING_CASE(gms); 866 return -EIO; 867 } 868 } 869 870 struct intel_memory_region * 871 i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type, 872 u16 instance) 873 { 874 struct intel_uncore *uncore = &i915->uncore; 875 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); 876 resource_size_t dsm_size, dsm_base, lmem_size; 877 struct intel_memory_region *mem; 878 resource_size_t io_start, io_size; 879 resource_size_t min_page_size; 880 int ret; 881 882 if (WARN_ON_ONCE(instance)) 883 return ERR_PTR(-ENODEV); 884 885 if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR)) 886 return ERR_PTR(-ENXIO); 887 888 if (HAS_LMEMBAR_SMEM_STOLEN(i915) || IS_DG1(i915)) { 889 lmem_size = pci_resource_len(pdev, GEN12_LMEM_BAR); 890 } else { 891 resource_size_t lmem_range; 892 893 lmem_range = intel_gt_mcr_read_any(&i915->gt0, XEHP_TILE0_ADDR_RANGE) & 0xFFFF; 894 lmem_size = lmem_range >> XEHP_TILE_LMEM_RANGE_SHIFT; 895 lmem_size *= SZ_1G; 896 } 897 898 if (HAS_LMEMBAR_SMEM_STOLEN(i915)) { 899 /* 900 * MTL dsm size is in GGC register. 901 * Also MTL uses offset to GSMBASE in ptes, so i915 902 * uses dsm_base = 8MBs to setup stolen region, since 903 * DSMBASE = GSMBASE + 8MB. 904 */ 905 ret = mtl_get_gms_size(uncore); 906 if (ret < 0) { 907 drm_err(&i915->drm, "invalid MTL GGC register setting\n"); 908 return ERR_PTR(ret); 909 } 910 911 dsm_base = SZ_8M; 912 dsm_size = (resource_size_t)(ret * SZ_1M); 913 914 GEM_BUG_ON(pci_resource_len(pdev, GEN12_LMEM_BAR) != SZ_256M); 915 GEM_BUG_ON((dsm_base + dsm_size) > lmem_size); 916 } else { 917 /* Use DSM base address instead for stolen memory */ 918 dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE) & GEN12_BDSM_MASK; 919 if (WARN_ON(lmem_size < dsm_base)) 920 return ERR_PTR(-ENODEV); 921 dsm_size = ALIGN_DOWN(lmem_size - dsm_base, SZ_1M); 922 } 923 924 if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) { 925 io_start = 0; 926 io_size = 0; 927 } else { 928 io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + dsm_base; 929 io_size = dsm_size; 930 } 931 932 min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K : 933 I915_GTT_PAGE_SIZE_4K; 934 935 mem = intel_memory_region_create(i915, dsm_base, dsm_size, 936 min_page_size, 937 io_start, io_size, 938 type, instance, 939 &i915_region_stolen_lmem_ops); 940 if (IS_ERR(mem)) 941 return mem; 942 943 intel_memory_region_set_name(mem, "stolen-local"); 944 945 mem->private = true; 946 947 return mem; 948 } 949 950 struct intel_memory_region* 951 i915_gem_stolen_smem_setup(struct drm_i915_private *i915, u16 type, 952 u16 instance) 953 { 954 struct intel_memory_region *mem; 955 956 mem = intel_memory_region_create(i915, 957 intel_graphics_stolen_res.start, 958 resource_size(&intel_graphics_stolen_res), 959 PAGE_SIZE, 0, 0, type, instance, 960 &i915_region_stolen_smem_ops); 961 if (IS_ERR(mem)) 962 return mem; 963 964 intel_memory_region_set_name(mem, "stolen-system"); 965 966 mem->private = true; 967 968 return mem; 969 } 970 971 bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj) 972 { 973 return obj->ops == &i915_gem_object_stolen_ops; 974 } 975