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 /* 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 */ 445 static 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; 504 505 bail_out: 506 i915->dsm.reserved = DEFINE_RES_MEM(reserved_base, 0); 507 508 return ret; 509 } 510 511 static 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_size = min(mem->io_size, resource_size(&mem->region)); 545 546 i915->dsm.usable_size = resource_size(&mem->region); 547 548 drm_dbg(&i915->drm, 549 "Memory reserved for graphics device: %lluK, usable: %lluK\n", 550 (u64)resource_size(&i915->dsm.stolen) >> 10, 551 (u64)i915->dsm.usable_size >> 10); 552 553 if (i915->dsm.usable_size == 0) 554 return -ENOSPC; 555 556 /* Basic memrange allocator for stolen space. */ 557 drm_mm_init(&i915->mm.stolen, 0, i915->dsm.usable_size); 558 559 /* 560 * Access to stolen lmem beyond certain size for MTL A0 stepping 561 * would crash the machine. Disable stolen lmem for userspace access 562 * by setting usable_size to zero. 563 */ 564 if (IS_METEORLAKE(i915) && INTEL_REVID(i915) == 0x0) 565 i915->dsm.usable_size = 0; 566 567 return 0; 568 } 569 570 static void dbg_poison(struct i915_ggtt *ggtt, 571 dma_addr_t addr, resource_size_t size, 572 u8 x) 573 { 574 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) 575 if (!drm_mm_node_allocated(&ggtt->error_capture)) 576 return; 577 578 if (ggtt->vm.bind_async_flags & I915_VMA_GLOBAL_BIND) 579 return; /* beware stop_machine() inversion */ 580 581 GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE)); 582 583 mutex_lock(&ggtt->error_mutex); 584 while (size) { 585 void __iomem *s; 586 587 ggtt->vm.insert_page(&ggtt->vm, addr, 588 ggtt->error_capture.start, 589 i915_gem_get_pat_index(ggtt->vm.i915, 590 I915_CACHE_NONE), 591 0); 592 mb(); 593 594 s = io_mapping_map_wc(&ggtt->iomap, 595 ggtt->error_capture.start, 596 PAGE_SIZE); 597 memset_io(s, x, PAGE_SIZE); 598 io_mapping_unmap(s); 599 600 addr += PAGE_SIZE; 601 size -= PAGE_SIZE; 602 } 603 mb(); 604 ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE); 605 mutex_unlock(&ggtt->error_mutex); 606 #endif 607 } 608 609 static struct sg_table * 610 i915_pages_create_for_stolen(struct drm_device *dev, 611 resource_size_t offset, resource_size_t size) 612 { 613 struct drm_i915_private *i915 = to_i915(dev); 614 struct sg_table *st; 615 struct scatterlist *sg; 616 617 GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm.stolen))); 618 619 /* We hide that we have no struct page backing our stolen object 620 * by wrapping the contiguous physical allocation with a fake 621 * dma mapping in a single scatterlist. 622 */ 623 624 st = kmalloc(sizeof(*st), GFP_KERNEL); 625 if (st == NULL) 626 return ERR_PTR(-ENOMEM); 627 628 if (sg_alloc_table(st, 1, GFP_KERNEL)) { 629 kfree(st); 630 return ERR_PTR(-ENOMEM); 631 } 632 633 sg = st->sgl; 634 sg->offset = 0; 635 sg->length = size; 636 637 sg_dma_address(sg) = (dma_addr_t)i915->dsm.stolen.start + offset; 638 sg_dma_len(sg) = size; 639 640 return st; 641 } 642 643 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) 644 { 645 struct drm_i915_private *i915 = to_i915(obj->base.dev); 646 struct sg_table *pages = 647 i915_pages_create_for_stolen(obj->base.dev, 648 obj->stolen->start, 649 obj->stolen->size); 650 if (IS_ERR(pages)) 651 return PTR_ERR(pages); 652 653 dbg_poison(to_gt(i915)->ggtt, 654 sg_dma_address(pages->sgl), 655 sg_dma_len(pages->sgl), 656 POISON_INUSE); 657 658 __i915_gem_object_set_pages(obj, pages); 659 660 return 0; 661 } 662 663 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj, 664 struct sg_table *pages) 665 { 666 struct drm_i915_private *i915 = to_i915(obj->base.dev); 667 /* Should only be called from i915_gem_object_release_stolen() */ 668 669 dbg_poison(to_gt(i915)->ggtt, 670 sg_dma_address(pages->sgl), 671 sg_dma_len(pages->sgl), 672 POISON_FREE); 673 674 sg_free_table(pages); 675 kfree(pages); 676 } 677 678 static void 679 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) 680 { 681 struct drm_i915_private *i915 = to_i915(obj->base.dev); 682 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen); 683 684 GEM_BUG_ON(!stolen); 685 i915_gem_stolen_remove_node(i915, stolen); 686 kfree(stolen); 687 688 i915_gem_object_release_memory_region(obj); 689 } 690 691 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { 692 .name = "i915_gem_object_stolen", 693 .get_pages = i915_gem_object_get_pages_stolen, 694 .put_pages = i915_gem_object_put_pages_stolen, 695 .release = i915_gem_object_release_stolen, 696 }; 697 698 static int __i915_gem_object_create_stolen(struct intel_memory_region *mem, 699 struct drm_i915_gem_object *obj, 700 struct drm_mm_node *stolen) 701 { 702 static struct lock_class_key lock_class; 703 unsigned int cache_level; 704 unsigned int flags; 705 int err; 706 707 /* 708 * Stolen objects are always physically contiguous since we just 709 * allocate one big block underneath using the drm_mm range allocator. 710 */ 711 flags = I915_BO_ALLOC_CONTIGUOUS; 712 713 drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size); 714 i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class, flags); 715 716 obj->stolen = stolen; 717 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; 718 cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE; 719 i915_gem_object_set_cache_coherency(obj, cache_level); 720 721 if (WARN_ON(!i915_gem_object_trylock(obj, NULL))) 722 return -EBUSY; 723 724 i915_gem_object_init_memory_region(obj, mem); 725 726 err = i915_gem_object_pin_pages(obj); 727 if (err) 728 i915_gem_object_release_memory_region(obj); 729 i915_gem_object_unlock(obj); 730 731 return err; 732 } 733 734 static int _i915_gem_object_stolen_init(struct intel_memory_region *mem, 735 struct drm_i915_gem_object *obj, 736 resource_size_t offset, 737 resource_size_t size, 738 resource_size_t page_size, 739 unsigned int flags) 740 { 741 struct drm_i915_private *i915 = mem->i915; 742 struct drm_mm_node *stolen; 743 int ret; 744 745 if (!drm_mm_initialized(&i915->mm.stolen)) 746 return -ENODEV; 747 748 if (size == 0) 749 return -EINVAL; 750 751 /* 752 * With discrete devices, where we lack a mappable aperture there is no 753 * possible way to ever access this memory on the CPU side. 754 */ 755 if (mem->type == INTEL_MEMORY_STOLEN_LOCAL && !mem->io_size && 756 !(flags & I915_BO_ALLOC_GPU_ONLY)) 757 return -ENOSPC; 758 759 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 760 if (!stolen) 761 return -ENOMEM; 762 763 if (offset != I915_BO_INVALID_OFFSET) { 764 drm_dbg(&i915->drm, 765 "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n", 766 &offset, &size); 767 768 stolen->start = offset; 769 stolen->size = size; 770 mutex_lock(&i915->mm.stolen_lock); 771 ret = drm_mm_reserve_node(&i915->mm.stolen, stolen); 772 mutex_unlock(&i915->mm.stolen_lock); 773 } else { 774 ret = i915_gem_stolen_insert_node(i915, stolen, size, 775 mem->min_page_size); 776 } 777 if (ret) 778 goto err_free; 779 780 ret = __i915_gem_object_create_stolen(mem, obj, stolen); 781 if (ret) 782 goto err_remove; 783 784 return 0; 785 786 err_remove: 787 i915_gem_stolen_remove_node(i915, stolen); 788 err_free: 789 kfree(stolen); 790 return ret; 791 } 792 793 struct drm_i915_gem_object * 794 i915_gem_object_create_stolen(struct drm_i915_private *i915, 795 resource_size_t size) 796 { 797 return i915_gem_object_create_region(i915->mm.stolen_region, size, 0, 0); 798 } 799 800 static int init_stolen_smem(struct intel_memory_region *mem) 801 { 802 int err; 803 804 /* 805 * Initialise stolen early so that we may reserve preallocated 806 * objects for the BIOS to KMS transition. 807 */ 808 err = i915_gem_init_stolen(mem); 809 if (err) 810 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); 811 812 return 0; 813 } 814 815 static int release_stolen_smem(struct intel_memory_region *mem) 816 { 817 i915_gem_cleanup_stolen(mem->i915); 818 return 0; 819 } 820 821 static const struct intel_memory_region_ops i915_region_stolen_smem_ops = { 822 .init = init_stolen_smem, 823 .release = release_stolen_smem, 824 .init_object = _i915_gem_object_stolen_init, 825 }; 826 827 static int init_stolen_lmem(struct intel_memory_region *mem) 828 { 829 struct drm_i915_private *i915 = mem->i915; 830 int err; 831 832 if (GEM_WARN_ON(resource_size(&mem->region) == 0)) 833 return 0; 834 835 err = i915_gem_init_stolen(mem); 836 if (err) { 837 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); 838 return 0; 839 } 840 841 if (mem->io_size && 842 !io_mapping_init_wc(&mem->iomap, mem->io_start, mem->io_size)) 843 goto err_cleanup; 844 845 drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n", 846 &mem->io_start); 847 drm_dbg(&i915->drm, "Stolen Local DSM base: %pa\n", &mem->region.start); 848 849 return 0; 850 851 err_cleanup: 852 i915_gem_cleanup_stolen(mem->i915); 853 return err; 854 } 855 856 static int release_stolen_lmem(struct intel_memory_region *mem) 857 { 858 if (mem->io_size) 859 io_mapping_fini(&mem->iomap); 860 i915_gem_cleanup_stolen(mem->i915); 861 return 0; 862 } 863 864 static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = { 865 .init = init_stolen_lmem, 866 .release = release_stolen_lmem, 867 .init_object = _i915_gem_object_stolen_init, 868 }; 869 870 static int mtl_get_gms_size(struct intel_uncore *uncore) 871 { 872 u16 ggc, gms; 873 874 ggc = intel_uncore_read16(uncore, GGC); 875 876 /* check GGMS, should be fixed 0x3 (8MB) */ 877 if ((ggc & GGMS_MASK) != GGMS_MASK) 878 return -EIO; 879 880 /* return valid GMS value, -EIO if invalid */ 881 gms = REG_FIELD_GET(GMS_MASK, ggc); 882 switch (gms) { 883 case 0x0 ... 0x04: 884 return gms * 32; 885 case 0xf0 ... 0xfe: 886 return (gms - 0xf0 + 1) * 4; 887 default: 888 MISSING_CASE(gms); 889 return -EIO; 890 } 891 } 892 893 struct intel_memory_region * 894 i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type, 895 u16 instance) 896 { 897 struct intel_uncore *uncore = &i915->uncore; 898 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); 899 resource_size_t dsm_size, dsm_base, lmem_size; 900 struct intel_memory_region *mem; 901 resource_size_t io_start, io_size; 902 resource_size_t min_page_size; 903 int ret; 904 905 if (WARN_ON_ONCE(instance)) 906 return ERR_PTR(-ENODEV); 907 908 if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR)) 909 return ERR_PTR(-ENXIO); 910 911 if (HAS_LMEMBAR_SMEM_STOLEN(i915) || IS_DG1(i915)) { 912 lmem_size = pci_resource_len(pdev, GEN12_LMEM_BAR); 913 } else { 914 resource_size_t lmem_range; 915 916 lmem_range = intel_gt_mcr_read_any(to_gt(i915), XEHP_TILE0_ADDR_RANGE) & 0xFFFF; 917 lmem_size = lmem_range >> XEHP_TILE_LMEM_RANGE_SHIFT; 918 lmem_size *= SZ_1G; 919 } 920 921 if (HAS_LMEMBAR_SMEM_STOLEN(i915)) { 922 /* 923 * MTL dsm size is in GGC register. 924 * Also MTL uses offset to GSMBASE in ptes, so i915 925 * uses dsm_base = 8MBs to setup stolen region, since 926 * DSMBASE = GSMBASE + 8MB. 927 */ 928 ret = mtl_get_gms_size(uncore); 929 if (ret < 0) { 930 drm_err(&i915->drm, "invalid MTL GGC register setting\n"); 931 return ERR_PTR(ret); 932 } 933 934 dsm_base = SZ_8M; 935 dsm_size = (resource_size_t)(ret * SZ_1M); 936 937 GEM_BUG_ON(pci_resource_len(pdev, GEN12_LMEM_BAR) != SZ_256M); 938 GEM_BUG_ON((dsm_base + dsm_size) > lmem_size); 939 } else { 940 /* Use DSM base address instead for stolen memory */ 941 dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE) & GEN12_BDSM_MASK; 942 if (WARN_ON(lmem_size < dsm_base)) 943 return ERR_PTR(-ENODEV); 944 dsm_size = ALIGN_DOWN(lmem_size - dsm_base, SZ_1M); 945 } 946 947 if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) { 948 io_start = 0; 949 io_size = 0; 950 } else { 951 io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + dsm_base; 952 io_size = dsm_size; 953 } 954 955 min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K : 956 I915_GTT_PAGE_SIZE_4K; 957 958 mem = intel_memory_region_create(i915, dsm_base, dsm_size, 959 min_page_size, 960 io_start, io_size, 961 type, instance, 962 &i915_region_stolen_lmem_ops); 963 if (IS_ERR(mem)) 964 return mem; 965 966 intel_memory_region_set_name(mem, "stolen-local"); 967 968 mem->private = true; 969 970 return mem; 971 } 972 973 struct intel_memory_region* 974 i915_gem_stolen_smem_setup(struct drm_i915_private *i915, u16 type, 975 u16 instance) 976 { 977 struct intel_memory_region *mem; 978 979 mem = intel_memory_region_create(i915, 980 intel_graphics_stolen_res.start, 981 resource_size(&intel_graphics_stolen_res), 982 PAGE_SIZE, 0, 0, type, instance, 983 &i915_region_stolen_smem_ops); 984 if (IS_ERR(mem)) 985 return mem; 986 987 intel_memory_region_set_name(mem, "stolen-system"); 988 989 mem->private = true; 990 991 return mem; 992 } 993 994 bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj) 995 { 996 return obj->ops == &i915_gem_object_stolen_ops; 997 } 998 999 bool i915_gem_stolen_initialized(const struct drm_i915_private *i915) 1000 { 1001 return drm_mm_initialized(&i915->mm.stolen); 1002 } 1003 1004 u64 i915_gem_stolen_area_address(const struct drm_i915_private *i915) 1005 { 1006 return i915->dsm.stolen.start; 1007 } 1008 1009 u64 i915_gem_stolen_area_size(const struct drm_i915_private *i915) 1010 { 1011 return resource_size(&i915->dsm.stolen); 1012 } 1013 1014 u64 i915_gem_stolen_node_address(const struct drm_i915_private *i915, 1015 const struct drm_mm_node *node) 1016 { 1017 return i915->dsm.stolen.start + i915_gem_stolen_node_offset(node); 1018 } 1019 1020 bool i915_gem_stolen_node_allocated(const struct drm_mm_node *node) 1021 { 1022 return drm_mm_node_allocated(node); 1023 } 1024 1025 u64 i915_gem_stolen_node_offset(const struct drm_mm_node *node) 1026 { 1027 return node->start; 1028 } 1029 1030 u64 i915_gem_stolen_node_size(const struct drm_mm_node *node) 1031 { 1032 return node->size; 1033 } 1034