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 return 0; 539 } 540 541 static void dbg_poison(struct i915_ggtt *ggtt, 542 dma_addr_t addr, resource_size_t size, 543 u8 x) 544 { 545 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) 546 if (!drm_mm_node_allocated(&ggtt->error_capture)) 547 return; 548 549 if (ggtt->vm.bind_async_flags & I915_VMA_GLOBAL_BIND) 550 return; /* beware stop_machine() inversion */ 551 552 GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE)); 553 554 mutex_lock(&ggtt->error_mutex); 555 while (size) { 556 void __iomem *s; 557 558 ggtt->vm.insert_page(&ggtt->vm, addr, 559 ggtt->error_capture.start, 560 I915_CACHE_NONE, 0); 561 mb(); 562 563 s = io_mapping_map_wc(&ggtt->iomap, 564 ggtt->error_capture.start, 565 PAGE_SIZE); 566 memset_io(s, x, PAGE_SIZE); 567 io_mapping_unmap(s); 568 569 addr += PAGE_SIZE; 570 size -= PAGE_SIZE; 571 } 572 mb(); 573 ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE); 574 mutex_unlock(&ggtt->error_mutex); 575 #endif 576 } 577 578 static struct sg_table * 579 i915_pages_create_for_stolen(struct drm_device *dev, 580 resource_size_t offset, resource_size_t size) 581 { 582 struct drm_i915_private *i915 = to_i915(dev); 583 struct sg_table *st; 584 struct scatterlist *sg; 585 586 GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm.stolen))); 587 588 /* We hide that we have no struct page backing our stolen object 589 * by wrapping the contiguous physical allocation with a fake 590 * dma mapping in a single scatterlist. 591 */ 592 593 st = kmalloc(sizeof(*st), GFP_KERNEL); 594 if (st == NULL) 595 return ERR_PTR(-ENOMEM); 596 597 if (sg_alloc_table(st, 1, GFP_KERNEL)) { 598 kfree(st); 599 return ERR_PTR(-ENOMEM); 600 } 601 602 sg = st->sgl; 603 sg->offset = 0; 604 sg->length = size; 605 606 sg_dma_address(sg) = (dma_addr_t)i915->dsm.stolen.start + offset; 607 sg_dma_len(sg) = size; 608 609 return st; 610 } 611 612 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) 613 { 614 struct drm_i915_private *i915 = to_i915(obj->base.dev); 615 struct sg_table *pages = 616 i915_pages_create_for_stolen(obj->base.dev, 617 obj->stolen->start, 618 obj->stolen->size); 619 if (IS_ERR(pages)) 620 return PTR_ERR(pages); 621 622 dbg_poison(to_gt(i915)->ggtt, 623 sg_dma_address(pages->sgl), 624 sg_dma_len(pages->sgl), 625 POISON_INUSE); 626 627 __i915_gem_object_set_pages(obj, pages); 628 629 return 0; 630 } 631 632 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj, 633 struct sg_table *pages) 634 { 635 struct drm_i915_private *i915 = to_i915(obj->base.dev); 636 /* Should only be called from i915_gem_object_release_stolen() */ 637 638 dbg_poison(to_gt(i915)->ggtt, 639 sg_dma_address(pages->sgl), 640 sg_dma_len(pages->sgl), 641 POISON_FREE); 642 643 sg_free_table(pages); 644 kfree(pages); 645 } 646 647 static void 648 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) 649 { 650 struct drm_i915_private *i915 = to_i915(obj->base.dev); 651 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen); 652 653 GEM_BUG_ON(!stolen); 654 i915_gem_stolen_remove_node(i915, stolen); 655 kfree(stolen); 656 657 i915_gem_object_release_memory_region(obj); 658 } 659 660 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { 661 .name = "i915_gem_object_stolen", 662 .get_pages = i915_gem_object_get_pages_stolen, 663 .put_pages = i915_gem_object_put_pages_stolen, 664 .release = i915_gem_object_release_stolen, 665 }; 666 667 static int __i915_gem_object_create_stolen(struct intel_memory_region *mem, 668 struct drm_i915_gem_object *obj, 669 struct drm_mm_node *stolen) 670 { 671 static struct lock_class_key lock_class; 672 unsigned int cache_level; 673 unsigned int flags; 674 int err; 675 676 /* 677 * Stolen objects are always physically contiguous since we just 678 * allocate one big block underneath using the drm_mm range allocator. 679 */ 680 flags = I915_BO_ALLOC_CONTIGUOUS; 681 682 drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size); 683 i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class, flags); 684 685 obj->stolen = stolen; 686 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; 687 cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE; 688 i915_gem_object_set_cache_coherency(obj, cache_level); 689 690 if (WARN_ON(!i915_gem_object_trylock(obj, NULL))) 691 return -EBUSY; 692 693 i915_gem_object_init_memory_region(obj, mem); 694 695 err = i915_gem_object_pin_pages(obj); 696 if (err) 697 i915_gem_object_release_memory_region(obj); 698 i915_gem_object_unlock(obj); 699 700 return err; 701 } 702 703 static int _i915_gem_object_stolen_init(struct intel_memory_region *mem, 704 struct drm_i915_gem_object *obj, 705 resource_size_t offset, 706 resource_size_t size, 707 resource_size_t page_size, 708 unsigned int flags) 709 { 710 struct drm_i915_private *i915 = mem->i915; 711 struct drm_mm_node *stolen; 712 int ret; 713 714 if (!drm_mm_initialized(&i915->mm.stolen)) 715 return -ENODEV; 716 717 if (size == 0) 718 return -EINVAL; 719 720 /* 721 * With discrete devices, where we lack a mappable aperture there is no 722 * possible way to ever access this memory on the CPU side. 723 */ 724 if (mem->type == INTEL_MEMORY_STOLEN_LOCAL && !mem->io_size && 725 !(flags & I915_BO_ALLOC_GPU_ONLY)) 726 return -ENOSPC; 727 728 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 729 if (!stolen) 730 return -ENOMEM; 731 732 if (offset != I915_BO_INVALID_OFFSET) { 733 drm_dbg(&i915->drm, 734 "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n", 735 &offset, &size); 736 737 stolen->start = offset; 738 stolen->size = size; 739 mutex_lock(&i915->mm.stolen_lock); 740 ret = drm_mm_reserve_node(&i915->mm.stolen, stolen); 741 mutex_unlock(&i915->mm.stolen_lock); 742 } else { 743 ret = i915_gem_stolen_insert_node(i915, stolen, size, 744 mem->min_page_size); 745 } 746 if (ret) 747 goto err_free; 748 749 ret = __i915_gem_object_create_stolen(mem, obj, stolen); 750 if (ret) 751 goto err_remove; 752 753 return 0; 754 755 err_remove: 756 i915_gem_stolen_remove_node(i915, stolen); 757 err_free: 758 kfree(stolen); 759 return ret; 760 } 761 762 struct drm_i915_gem_object * 763 i915_gem_object_create_stolen(struct drm_i915_private *i915, 764 resource_size_t size) 765 { 766 return i915_gem_object_create_region(i915->mm.stolen_region, size, 0, 0); 767 } 768 769 static int init_stolen_smem(struct intel_memory_region *mem) 770 { 771 int err; 772 773 /* 774 * Initialise stolen early so that we may reserve preallocated 775 * objects for the BIOS to KMS transition. 776 */ 777 err = i915_gem_init_stolen(mem); 778 if (err) 779 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); 780 781 return 0; 782 } 783 784 static int release_stolen_smem(struct intel_memory_region *mem) 785 { 786 i915_gem_cleanup_stolen(mem->i915); 787 return 0; 788 } 789 790 static const struct intel_memory_region_ops i915_region_stolen_smem_ops = { 791 .init = init_stolen_smem, 792 .release = release_stolen_smem, 793 .init_object = _i915_gem_object_stolen_init, 794 }; 795 796 static int init_stolen_lmem(struct intel_memory_region *mem) 797 { 798 struct drm_i915_private *i915 = mem->i915; 799 int err; 800 801 if (GEM_WARN_ON(resource_size(&mem->region) == 0)) 802 return 0; 803 804 err = i915_gem_init_stolen(mem); 805 if (err) { 806 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); 807 return 0; 808 } 809 810 if (mem->io_size && 811 !io_mapping_init_wc(&mem->iomap, mem->io_start, mem->io_size)) 812 goto err_cleanup; 813 814 drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n", 815 &mem->io_start); 816 drm_dbg(&i915->drm, "Stolen Local DSM base: %pa\n", &mem->region.start); 817 818 return 0; 819 820 err_cleanup: 821 i915_gem_cleanup_stolen(mem->i915); 822 return err; 823 } 824 825 static int release_stolen_lmem(struct intel_memory_region *mem) 826 { 827 if (mem->io_size) 828 io_mapping_fini(&mem->iomap); 829 i915_gem_cleanup_stolen(mem->i915); 830 return 0; 831 } 832 833 static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = { 834 .init = init_stolen_lmem, 835 .release = release_stolen_lmem, 836 .init_object = _i915_gem_object_stolen_init, 837 }; 838 839 static int mtl_get_gms_size(struct intel_uncore *uncore) 840 { 841 u16 ggc, gms; 842 843 ggc = intel_uncore_read16(uncore, GGC); 844 845 /* check GGMS, should be fixed 0x3 (8MB) */ 846 if ((ggc & GGMS_MASK) != GGMS_MASK) 847 return -EIO; 848 849 /* return valid GMS value, -EIO if invalid */ 850 gms = REG_FIELD_GET(GMS_MASK, ggc); 851 switch (gms) { 852 case 0x0 ... 0x04: 853 return gms * 32; 854 case 0xf0 ... 0xfe: 855 return (gms - 0xf0 + 1) * 4; 856 default: 857 MISSING_CASE(gms); 858 return -EIO; 859 } 860 } 861 862 struct intel_memory_region * 863 i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type, 864 u16 instance) 865 { 866 struct intel_uncore *uncore = &i915->uncore; 867 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); 868 resource_size_t dsm_size, dsm_base, lmem_size; 869 struct intel_memory_region *mem; 870 resource_size_t io_start, io_size; 871 resource_size_t min_page_size; 872 int ret; 873 874 if (WARN_ON_ONCE(instance)) 875 return ERR_PTR(-ENODEV); 876 877 if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR)) 878 return ERR_PTR(-ENXIO); 879 880 if (HAS_LMEMBAR_SMEM_STOLEN(i915) || IS_DG1(i915)) { 881 lmem_size = pci_resource_len(pdev, GEN12_LMEM_BAR); 882 } else { 883 resource_size_t lmem_range; 884 885 lmem_range = intel_gt_mcr_read_any(&i915->gt0, XEHP_TILE0_ADDR_RANGE) & 0xFFFF; 886 lmem_size = lmem_range >> XEHP_TILE_LMEM_RANGE_SHIFT; 887 lmem_size *= SZ_1G; 888 } 889 890 if (HAS_LMEMBAR_SMEM_STOLEN(i915)) { 891 /* 892 * MTL dsm size is in GGC register. 893 * Also MTL uses offset to GSMBASE in ptes, so i915 894 * uses dsm_base = 8MBs to setup stolen region, since 895 * DSMBASE = GSMBASE + 8MB. 896 */ 897 ret = mtl_get_gms_size(uncore); 898 if (ret < 0) { 899 drm_err(&i915->drm, "invalid MTL GGC register setting\n"); 900 return ERR_PTR(ret); 901 } 902 903 dsm_base = SZ_8M; 904 dsm_size = (resource_size_t)(ret * SZ_1M); 905 906 GEM_BUG_ON(pci_resource_len(pdev, GEN12_LMEM_BAR) != SZ_256M); 907 GEM_BUG_ON((dsm_base + dsm_size) > lmem_size); 908 } else { 909 /* Use DSM base address instead for stolen memory */ 910 dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE) & GEN12_BDSM_MASK; 911 if (WARN_ON(lmem_size < dsm_base)) 912 return ERR_PTR(-ENODEV); 913 dsm_size = ALIGN_DOWN(lmem_size - dsm_base, SZ_1M); 914 } 915 916 if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) { 917 io_start = 0; 918 io_size = 0; 919 } else { 920 io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + dsm_base; 921 io_size = dsm_size; 922 } 923 924 min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K : 925 I915_GTT_PAGE_SIZE_4K; 926 927 mem = intel_memory_region_create(i915, dsm_base, dsm_size, 928 min_page_size, 929 io_start, io_size, 930 type, instance, 931 &i915_region_stolen_lmem_ops); 932 if (IS_ERR(mem)) 933 return mem; 934 935 intel_memory_region_set_name(mem, "stolen-local"); 936 937 mem->private = true; 938 939 return mem; 940 } 941 942 struct intel_memory_region* 943 i915_gem_stolen_smem_setup(struct drm_i915_private *i915, u16 type, 944 u16 instance) 945 { 946 struct intel_memory_region *mem; 947 948 mem = intel_memory_region_create(i915, 949 intel_graphics_stolen_res.start, 950 resource_size(&intel_graphics_stolen_res), 951 PAGE_SIZE, 0, 0, type, instance, 952 &i915_region_stolen_smem_ops); 953 if (IS_ERR(mem)) 954 return mem; 955 956 intel_memory_region_set_name(mem, "stolen-system"); 957 958 mem->private = true; 959 960 return mem; 961 } 962 963 bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj) 964 { 965 return obj->ops == &i915_gem_object_stolen_ops; 966 } 967