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 #ifdef __linux__ 148 /* 149 * With stolen lmem, we don't need to request system memory for the 150 * address range since it's local to the gpu. 151 * 152 * Starting MTL, in IGFX devices the stolen memory is exposed via 153 * LMEMBAR and shall be considered similar to stolen lmem. 154 */ 155 if (HAS_LMEM(i915) || HAS_LMEMBAR_SMEM_STOLEN(i915)) 156 return 0; 157 158 /* 159 * Verify that nothing else uses this physical address. Stolen 160 * memory should be reserved by the BIOS and hidden from the 161 * kernel. So if the region is already marked as busy, something 162 * is seriously wrong. 163 */ 164 r = devm_request_mem_region(i915->drm.dev, dsm->start, 165 resource_size(dsm), 166 "Graphics Stolen Memory"); 167 if (r == NULL) { 168 /* 169 * One more attempt but this time requesting region from 170 * start + 1, as we have seen that this resolves the region 171 * conflict with the PCI Bus. 172 * This is a BIOS w/a: Some BIOS wrap stolen in the root 173 * PCI bus, but have an off-by-one error. Hence retry the 174 * reservation starting from 1 instead of 0. 175 * There's also BIOS with off-by-one on the other end. 176 */ 177 r = devm_request_mem_region(i915->drm.dev, dsm->start + 1, 178 resource_size(dsm) - 2, 179 "Graphics Stolen Memory"); 180 /* 181 * GEN3 firmware likes to smash pci bridges into the stolen 182 * range. Apparently this works. 183 */ 184 if (!r && GRAPHICS_VER(i915) != 3) { 185 drm_err(&i915->drm, 186 "conflict detected with stolen region: %pR\n", 187 dsm); 188 189 return -EBUSY; 190 } 191 } 192 #endif 193 194 return 0; 195 } 196 197 static void i915_gem_cleanup_stolen(struct drm_i915_private *i915) 198 { 199 if (!drm_mm_initialized(&i915->mm.stolen)) 200 return; 201 202 drm_mm_takedown(&i915->mm.stolen); 203 } 204 205 static void g4x_get_stolen_reserved(struct drm_i915_private *i915, 206 struct intel_uncore *uncore, 207 resource_size_t *base, 208 resource_size_t *size) 209 { 210 u32 reg_val = intel_uncore_read(uncore, 211 IS_GM45(i915) ? 212 CTG_STOLEN_RESERVED : 213 ELK_STOLEN_RESERVED); 214 resource_size_t stolen_top = i915->dsm.stolen.end + 1; 215 216 drm_dbg(&i915->drm, "%s_STOLEN_RESERVED = %08x\n", 217 IS_GM45(i915) ? "CTG" : "ELK", reg_val); 218 219 if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0) 220 return; 221 222 /* 223 * Whether ILK really reuses the ELK register for this is unclear. 224 * Let's see if we catch anyone with this supposedly enabled on ILK. 225 */ 226 drm_WARN(&i915->drm, GRAPHICS_VER(i915) == 5, 227 "ILK stolen reserved found? 0x%08x\n", 228 reg_val); 229 230 if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK)) 231 return; 232 233 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16; 234 drm_WARN_ON(&i915->drm, 235 (reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base); 236 237 *size = stolen_top - *base; 238 } 239 240 static void gen6_get_stolen_reserved(struct drm_i915_private *i915, 241 struct intel_uncore *uncore, 242 resource_size_t *base, 243 resource_size_t *size) 244 { 245 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 246 247 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 248 249 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 250 return; 251 252 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 253 254 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) { 255 case GEN6_STOLEN_RESERVED_1M: 256 *size = 1024 * 1024; 257 break; 258 case GEN6_STOLEN_RESERVED_512K: 259 *size = 512 * 1024; 260 break; 261 case GEN6_STOLEN_RESERVED_256K: 262 *size = 256 * 1024; 263 break; 264 case GEN6_STOLEN_RESERVED_128K: 265 *size = 128 * 1024; 266 break; 267 default: 268 *size = 1024 * 1024; 269 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK); 270 } 271 } 272 273 static void vlv_get_stolen_reserved(struct drm_i915_private *i915, 274 struct intel_uncore *uncore, 275 resource_size_t *base, 276 resource_size_t *size) 277 { 278 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 279 resource_size_t stolen_top = i915->dsm.stolen.end + 1; 280 281 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 282 283 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 284 return; 285 286 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { 287 default: 288 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); 289 fallthrough; 290 case GEN7_STOLEN_RESERVED_1M: 291 *size = 1024 * 1024; 292 break; 293 } 294 295 /* 296 * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the 297 * reserved location as (top - size). 298 */ 299 *base = stolen_top - *size; 300 } 301 302 static void gen7_get_stolen_reserved(struct drm_i915_private *i915, 303 struct intel_uncore *uncore, 304 resource_size_t *base, 305 resource_size_t *size) 306 { 307 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 308 309 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 310 311 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 312 return; 313 314 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK; 315 316 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { 317 case GEN7_STOLEN_RESERVED_1M: 318 *size = 1024 * 1024; 319 break; 320 case GEN7_STOLEN_RESERVED_256K: 321 *size = 256 * 1024; 322 break; 323 default: 324 *size = 1024 * 1024; 325 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); 326 } 327 } 328 329 static void chv_get_stolen_reserved(struct drm_i915_private *i915, 330 struct intel_uncore *uncore, 331 resource_size_t *base, 332 resource_size_t *size) 333 { 334 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 335 336 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 337 338 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 339 return; 340 341 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 342 343 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { 344 case GEN8_STOLEN_RESERVED_1M: 345 *size = 1024 * 1024; 346 break; 347 case GEN8_STOLEN_RESERVED_2M: 348 *size = 2 * 1024 * 1024; 349 break; 350 case GEN8_STOLEN_RESERVED_4M: 351 *size = 4 * 1024 * 1024; 352 break; 353 case GEN8_STOLEN_RESERVED_8M: 354 *size = 8 * 1024 * 1024; 355 break; 356 default: 357 *size = 8 * 1024 * 1024; 358 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); 359 } 360 } 361 362 static void bdw_get_stolen_reserved(struct drm_i915_private *i915, 363 struct intel_uncore *uncore, 364 resource_size_t *base, 365 resource_size_t *size) 366 { 367 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); 368 resource_size_t stolen_top = i915->dsm.stolen.end + 1; 369 370 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); 371 372 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) 373 return; 374 375 if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK)) 376 return; 377 378 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 379 *size = stolen_top - *base; 380 } 381 382 static void icl_get_stolen_reserved(struct drm_i915_private *i915, 383 struct intel_uncore *uncore, 384 resource_size_t *base, 385 resource_size_t *size) 386 { 387 u64 reg_val = intel_uncore_read64(uncore, GEN6_STOLEN_RESERVED); 388 389 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val); 390 391 /* Wa_14019821291 */ 392 if (MEDIA_VER_FULL(i915) == IP_VER(13, 0)) { 393 /* 394 * This workaround is primarily implemented by the BIOS. We 395 * just need to figure out whether the BIOS has applied the 396 * workaround (meaning the programmed address falls within 397 * the DSM) and, if so, reserve that part of the DSM to 398 * prevent accidental reuse. The DSM location should be just 399 * below the WOPCM. 400 */ 401 u64 gscpsmi_base = intel_uncore_read64_2x32(uncore, 402 MTL_GSCPSMI_BASEADDR_LSB, 403 MTL_GSCPSMI_BASEADDR_MSB); 404 if (gscpsmi_base >= i915->dsm.stolen.start && 405 gscpsmi_base < i915->dsm.stolen.end) { 406 *base = gscpsmi_base; 407 *size = i915->dsm.stolen.end - gscpsmi_base; 408 return; 409 } 410 } 411 412 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { 413 case GEN8_STOLEN_RESERVED_1M: 414 *size = 1024 * 1024; 415 break; 416 case GEN8_STOLEN_RESERVED_2M: 417 *size = 2 * 1024 * 1024; 418 break; 419 case GEN8_STOLEN_RESERVED_4M: 420 *size = 4 * 1024 * 1024; 421 break; 422 case GEN8_STOLEN_RESERVED_8M: 423 *size = 8 * 1024 * 1024; 424 break; 425 default: 426 *size = 8 * 1024 * 1024; 427 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); 428 } 429 430 if (HAS_LMEMBAR_SMEM_STOLEN(i915)) 431 /* the base is initialized to stolen top so subtract size to get base */ 432 *base -= *size; 433 else 434 *base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK; 435 } 436 437 /* 438 * Initialize i915->dsm.reserved to contain the reserved space within the Data 439 * Stolen Memory. This is a range on the top of DSM that is reserved, not to 440 * be used by driver, so must be excluded from the region passed to the 441 * allocator later. In the spec this is also called as WOPCM. 442 * 443 * Our expectation is that the reserved space is at the top of the stolen 444 * region, as it has been the case for every platform, and *never* at the 445 * bottom, so the calculation here can be simplified. 446 */ 447 static int init_reserved_stolen(struct drm_i915_private *i915) 448 { 449 struct intel_uncore *uncore = &i915->uncore; 450 resource_size_t reserved_base, stolen_top; 451 resource_size_t reserved_size; 452 int ret = 0; 453 454 stolen_top = i915->dsm.stolen.end + 1; 455 reserved_base = stolen_top; 456 reserved_size = 0; 457 458 if (GRAPHICS_VER(i915) >= 11) { 459 icl_get_stolen_reserved(i915, uncore, 460 &reserved_base, &reserved_size); 461 } else if (GRAPHICS_VER(i915) >= 8) { 462 if (IS_LP(i915)) 463 chv_get_stolen_reserved(i915, uncore, 464 &reserved_base, &reserved_size); 465 else 466 bdw_get_stolen_reserved(i915, uncore, 467 &reserved_base, &reserved_size); 468 } else if (GRAPHICS_VER(i915) >= 7) { 469 if (IS_VALLEYVIEW(i915)) 470 vlv_get_stolen_reserved(i915, uncore, 471 &reserved_base, &reserved_size); 472 else 473 gen7_get_stolen_reserved(i915, uncore, 474 &reserved_base, &reserved_size); 475 } else if (GRAPHICS_VER(i915) >= 6) { 476 gen6_get_stolen_reserved(i915, uncore, 477 &reserved_base, &reserved_size); 478 } else if (GRAPHICS_VER(i915) >= 5 || IS_G4X(i915)) { 479 g4x_get_stolen_reserved(i915, uncore, 480 &reserved_base, &reserved_size); 481 } 482 483 /* No reserved stolen */ 484 if (reserved_base == stolen_top) 485 goto bail_out; 486 487 if (!reserved_base) { 488 drm_err(&i915->drm, 489 "inconsistent reservation %pa + %pa; ignoring\n", 490 &reserved_base, &reserved_size); 491 ret = -EINVAL; 492 goto bail_out; 493 } 494 495 i915->dsm.reserved = DEFINE_RES_MEM(reserved_base, reserved_size); 496 497 #ifdef notyet 498 if (!resource_contains(&i915->dsm.stolen, &i915->dsm.reserved)) { 499 drm_err(&i915->drm, 500 "Stolen reserved area %pR outside stolen memory %pR\n", 501 &i915->dsm.reserved, &i915->dsm.stolen); 502 ret = -EINVAL; 503 goto bail_out; 504 } 505 #endif 506 507 return 0; 508 509 bail_out: 510 i915->dsm.reserved = DEFINE_RES_MEM(reserved_base, 0); 511 512 return ret; 513 } 514 515 static int i915_gem_init_stolen(struct intel_memory_region *mem) 516 { 517 struct drm_i915_private *i915 = mem->i915; 518 519 rw_init(&i915->mm.stolen_lock, "stln"); 520 521 if (intel_vgpu_active(i915)) { 522 drm_notice(&i915->drm, 523 "%s, disabling use of stolen memory\n", 524 "iGVT-g active"); 525 return -ENOSPC; 526 } 527 528 if (i915_vtd_active(i915) && GRAPHICS_VER(i915) < 8) { 529 drm_notice(&i915->drm, 530 "%s, disabling use of stolen memory\n", 531 "DMAR active"); 532 return -ENOSPC; 533 } 534 535 if (adjust_stolen(i915, &mem->region)) 536 return -ENOSPC; 537 538 if (request_smem_stolen(i915, &mem->region)) 539 return -ENOSPC; 540 541 i915->dsm.stolen = mem->region; 542 543 if (init_reserved_stolen(i915)) 544 return -ENOSPC; 545 546 /* Exclude the reserved region from driver use */ 547 mem->region.end = i915->dsm.reserved.start - 1; 548 mem->io = DEFINE_RES_MEM(mem->io.start, 549 min(resource_size(&mem->io), 550 resource_size(&mem->region))); 551 552 i915->dsm.usable_size = resource_size(&mem->region); 553 554 drm_dbg(&i915->drm, 555 "Memory reserved for graphics device: %lluK, usable: %lluK\n", 556 (u64)resource_size(&i915->dsm.stolen) >> 10, 557 (u64)i915->dsm.usable_size >> 10); 558 559 if (i915->dsm.usable_size == 0) 560 return -ENOSPC; 561 562 /* Basic memrange allocator for stolen space. */ 563 drm_mm_init(&i915->mm.stolen, 0, i915->dsm.usable_size); 564 565 /* 566 * Access to stolen lmem beyond certain size for MTL A0 stepping 567 * would crash the machine. Disable stolen lmem for userspace access 568 * by setting usable_size to zero. 569 */ 570 if (IS_METEORLAKE(i915) && INTEL_REVID(i915) == 0x0) 571 i915->dsm.usable_size = 0; 572 573 return 0; 574 } 575 576 static void dbg_poison(struct i915_ggtt *ggtt, 577 dma_addr_t addr, resource_size_t size, 578 u8 x) 579 { 580 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) 581 if (!drm_mm_node_allocated(&ggtt->error_capture)) 582 return; 583 584 if (ggtt->vm.bind_async_flags & I915_VMA_GLOBAL_BIND) 585 return; /* beware stop_machine() inversion */ 586 587 GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE)); 588 589 mutex_lock(&ggtt->error_mutex); 590 while (size) { 591 void __iomem *s; 592 593 ggtt->vm.insert_page(&ggtt->vm, addr, 594 ggtt->error_capture.start, 595 i915_gem_get_pat_index(ggtt->vm.i915, 596 I915_CACHE_NONE), 597 0); 598 mb(); 599 600 s = io_mapping_map_wc(&ggtt->iomap, 601 ggtt->error_capture.start, 602 PAGE_SIZE); 603 memset_io(s, x, PAGE_SIZE); 604 io_mapping_unmap(s); 605 606 addr += PAGE_SIZE; 607 size -= PAGE_SIZE; 608 } 609 mb(); 610 ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE); 611 mutex_unlock(&ggtt->error_mutex); 612 #endif 613 } 614 615 static struct sg_table * 616 i915_pages_create_for_stolen(struct drm_device *dev, 617 resource_size_t offset, resource_size_t size) 618 { 619 struct drm_i915_private *i915 = to_i915(dev); 620 struct sg_table *st; 621 struct scatterlist *sg; 622 623 GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm.stolen))); 624 625 /* We hide that we have no struct vm_page backing our stolen object 626 * by wrapping the contiguous physical allocation with a fake 627 * dma mapping in a single scatterlist. 628 */ 629 630 st = kmalloc(sizeof(*st), GFP_KERNEL); 631 if (st == NULL) 632 return ERR_PTR(-ENOMEM); 633 634 if (sg_alloc_table(st, 1, GFP_KERNEL)) { 635 kfree(st); 636 return ERR_PTR(-ENOMEM); 637 } 638 639 sg = st->sgl; 640 sg->offset = 0; 641 sg->length = size; 642 643 sg_dma_address(sg) = (dma_addr_t)i915->dsm.stolen.start + offset; 644 sg_dma_len(sg) = size; 645 646 return st; 647 } 648 649 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) 650 { 651 struct drm_i915_private *i915 = to_i915(obj->base.dev); 652 struct sg_table *pages = 653 i915_pages_create_for_stolen(obj->base.dev, 654 obj->stolen->start, 655 obj->stolen->size); 656 if (IS_ERR(pages)) 657 return PTR_ERR(pages); 658 659 dbg_poison(to_gt(i915)->ggtt, 660 sg_dma_address(pages->sgl), 661 sg_dma_len(pages->sgl), 662 POISON_INUSE); 663 664 __i915_gem_object_set_pages(obj, pages); 665 666 return 0; 667 } 668 669 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj, 670 struct sg_table *pages) 671 { 672 struct drm_i915_private *i915 = to_i915(obj->base.dev); 673 /* Should only be called from i915_gem_object_release_stolen() */ 674 675 dbg_poison(to_gt(i915)->ggtt, 676 sg_dma_address(pages->sgl), 677 sg_dma_len(pages->sgl), 678 POISON_FREE); 679 680 sg_free_table(pages); 681 kfree(pages); 682 } 683 684 static void 685 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) 686 { 687 struct drm_i915_private *i915 = to_i915(obj->base.dev); 688 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen); 689 690 GEM_BUG_ON(!stolen); 691 i915_gem_stolen_remove_node(i915, stolen); 692 kfree(stolen); 693 694 i915_gem_object_release_memory_region(obj); 695 } 696 697 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { 698 .name = "i915_gem_object_stolen", 699 .get_pages = i915_gem_object_get_pages_stolen, 700 .put_pages = i915_gem_object_put_pages_stolen, 701 .release = i915_gem_object_release_stolen, 702 }; 703 704 static int __i915_gem_object_create_stolen(struct intel_memory_region *mem, 705 struct drm_i915_gem_object *obj, 706 struct drm_mm_node *stolen) 707 { 708 static struct lock_class_key lock_class; 709 unsigned int cache_level; 710 unsigned int flags; 711 int err; 712 713 /* 714 * Stolen objects are always physically contiguous since we just 715 * allocate one big block underneath using the drm_mm range allocator. 716 */ 717 flags = I915_BO_ALLOC_CONTIGUOUS; 718 719 drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size); 720 i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class, flags); 721 722 obj->stolen = stolen; 723 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; 724 cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE; 725 i915_gem_object_set_cache_coherency(obj, cache_level); 726 727 if (WARN_ON(!i915_gem_object_trylock(obj, NULL))) 728 return -EBUSY; 729 730 i915_gem_object_init_memory_region(obj, mem); 731 732 err = i915_gem_object_pin_pages(obj); 733 if (err) 734 i915_gem_object_release_memory_region(obj); 735 i915_gem_object_unlock(obj); 736 737 return err; 738 } 739 740 static int _i915_gem_object_stolen_init(struct intel_memory_region *mem, 741 struct drm_i915_gem_object *obj, 742 resource_size_t offset, 743 resource_size_t size, 744 resource_size_t page_size, 745 unsigned int flags) 746 { 747 struct drm_i915_private *i915 = mem->i915; 748 struct drm_mm_node *stolen; 749 int ret; 750 751 if (!drm_mm_initialized(&i915->mm.stolen)) 752 return -ENODEV; 753 754 if (size == 0) 755 return -EINVAL; 756 757 /* 758 * With discrete devices, where we lack a mappable aperture there is no 759 * possible way to ever access this memory on the CPU side. 760 */ 761 if (mem->type == INTEL_MEMORY_STOLEN_LOCAL && !resource_size(&mem->io) && 762 !(flags & I915_BO_ALLOC_GPU_ONLY)) 763 return -ENOSPC; 764 765 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 766 if (!stolen) 767 return -ENOMEM; 768 769 if (offset != I915_BO_INVALID_OFFSET) { 770 drm_dbg(&i915->drm, 771 "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n", 772 &offset, &size); 773 774 stolen->start = offset; 775 stolen->size = size; 776 mutex_lock(&i915->mm.stolen_lock); 777 ret = drm_mm_reserve_node(&i915->mm.stolen, stolen); 778 mutex_unlock(&i915->mm.stolen_lock); 779 } else { 780 ret = i915_gem_stolen_insert_node(i915, stolen, size, 781 mem->min_page_size); 782 } 783 if (ret) 784 goto err_free; 785 786 ret = __i915_gem_object_create_stolen(mem, obj, stolen); 787 if (ret) 788 goto err_remove; 789 790 return 0; 791 792 err_remove: 793 i915_gem_stolen_remove_node(i915, stolen); 794 err_free: 795 kfree(stolen); 796 return ret; 797 } 798 799 struct drm_i915_gem_object * 800 i915_gem_object_create_stolen(struct drm_i915_private *i915, 801 resource_size_t size) 802 { 803 return i915_gem_object_create_region(i915->mm.stolen_region, size, 0, 0); 804 } 805 806 static int init_stolen_smem(struct intel_memory_region *mem) 807 { 808 int err; 809 810 /* 811 * Initialise stolen early so that we may reserve preallocated 812 * objects for the BIOS to KMS transition. 813 */ 814 err = i915_gem_init_stolen(mem); 815 if (err) 816 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); 817 818 return 0; 819 } 820 821 static int release_stolen_smem(struct intel_memory_region *mem) 822 { 823 i915_gem_cleanup_stolen(mem->i915); 824 return 0; 825 } 826 827 static const struct intel_memory_region_ops i915_region_stolen_smem_ops = { 828 .init = init_stolen_smem, 829 .release = release_stolen_smem, 830 .init_object = _i915_gem_object_stolen_init, 831 }; 832 833 static int init_stolen_lmem(struct intel_memory_region *mem) 834 { 835 int err; 836 837 if (GEM_WARN_ON(resource_size(&mem->region) == 0)) 838 return 0; 839 840 err = i915_gem_init_stolen(mem); 841 if (err) { 842 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); 843 return 0; 844 } 845 846 #ifdef __linux__ 847 if (resource_size(&mem->io) && 848 !io_mapping_init_wc(&mem->iomap, mem->io.start, resource_size(&mem->io))) 849 goto err_cleanup; 850 #else 851 if (resource_size(&mem->io)) { 852 paddr_t start, end; 853 struct vm_page *pgs; 854 int i; 855 bus_space_handle_t bsh; 856 857 start = atop(mem->io.start); 858 end = start + atop(resource_size(&mem->io)); 859 uvm_page_physload(start, end, start, end, PHYSLOAD_DEVICE); 860 861 pgs = PHYS_TO_VM_PAGE(mem->io.start); 862 for (i = 0; i < atop(resource_size(&mem->io)); i++) 863 atomic_setbits_int(&(pgs[i].pg_flags), PG_PMAP_WC); 864 865 if (bus_space_map(mem->i915->bst, mem->io.start, resource_size(&mem->io), 866 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE, &bsh)) 867 panic("can't map stolen lmem"); 868 869 mem->iomap.base = mem->io.start; 870 mem->iomap.size = resource_size(&mem->io); 871 mem->iomap.iomem = bus_space_vaddr(mem->i915->bst, bsh); 872 } 873 #endif 874 875 return 0; 876 #ifdef __linux__ 877 err_cleanup: 878 i915_gem_cleanup_stolen(mem->i915); 879 return err; 880 #endif 881 } 882 883 static int release_stolen_lmem(struct intel_memory_region *mem) 884 { 885 STUB(); 886 #ifdef notyet 887 if (resource_size(&mem->io)) 888 io_mapping_fini(&mem->iomap); 889 #endif 890 i915_gem_cleanup_stolen(mem->i915); 891 return 0; 892 } 893 894 static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = { 895 .init = init_stolen_lmem, 896 .release = release_stolen_lmem, 897 .init_object = _i915_gem_object_stolen_init, 898 }; 899 900 static int mtl_get_gms_size(struct intel_uncore *uncore) 901 { 902 u16 ggc, gms; 903 904 ggc = intel_uncore_read16(uncore, GGC); 905 906 /* check GGMS, should be fixed 0x3 (8MB) */ 907 if ((ggc & GGMS_MASK) != GGMS_MASK) 908 return -EIO; 909 910 /* return valid GMS value, -EIO if invalid */ 911 gms = REG_FIELD_GET(GMS_MASK, ggc); 912 switch (gms) { 913 case 0x0 ... 0x04: 914 return gms * 32; 915 case 0xf0 ... 0xfe: 916 return (gms - 0xf0 + 1) * 4; 917 default: 918 MISSING_CASE(gms); 919 return -EIO; 920 } 921 } 922 923 struct intel_memory_region * 924 i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type, 925 u16 instance) 926 { 927 struct intel_uncore *uncore = &i915->uncore; 928 struct pci_dev *pdev = i915->drm.pdev; 929 resource_size_t dsm_size, dsm_base, lmem_size; 930 struct intel_memory_region *mem; 931 resource_size_t io_start, io_size; 932 resource_size_t min_page_size; 933 int ret; 934 pcireg_t mtype; 935 bus_addr_t lmem_start; 936 bus_size_t lmem_len; 937 938 if (WARN_ON_ONCE(instance)) 939 return ERR_PTR(-ENODEV); 940 941 #ifdef __linux__ 942 if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR)) 943 return ERR_PTR(-ENXIO); 944 #else 945 mtype = pci_mapreg_type(i915->pc, i915->tag, 946 0x10 + (4 * GEN12_LMEM_BAR)); 947 ret = pci_mapreg_info(i915->pc, i915->tag, 948 0x10 + (4 * GEN12_LMEM_BAR), mtype, &lmem_start, &lmem_len, NULL); 949 if (ret != 0) 950 return ERR_PTR(-ENXIO); 951 #endif 952 953 if (HAS_LMEMBAR_SMEM_STOLEN(i915) || IS_DG1(i915)) { 954 #ifdef __linux__ 955 lmem_size = pci_resource_len(pdev, GEN12_LMEM_BAR); 956 #else 957 lmem_size = lmem_len; 958 #endif 959 } else { 960 resource_size_t lmem_range; 961 962 lmem_range = intel_gt_mcr_read_any(to_gt(i915), XEHP_TILE0_ADDR_RANGE) & 0xFFFF; 963 lmem_size = lmem_range >> XEHP_TILE_LMEM_RANGE_SHIFT; 964 lmem_size *= SZ_1G; 965 } 966 967 if (HAS_LMEMBAR_SMEM_STOLEN(i915)) { 968 /* 969 * MTL dsm size is in GGC register. 970 * Also MTL uses offset to GSMBASE in ptes, so i915 971 * uses dsm_base = 8MBs to setup stolen region, since 972 * DSMBASE = GSMBASE + 8MB. 973 */ 974 ret = mtl_get_gms_size(uncore); 975 if (ret < 0) { 976 drm_err(&i915->drm, "invalid MTL GGC register setting\n"); 977 return ERR_PTR(ret); 978 } 979 980 dsm_base = SZ_8M; 981 dsm_size = (resource_size_t)(ret * SZ_1M); 982 983 GEM_BUG_ON(pci_resource_len(pdev, GEN12_LMEM_BAR) != SZ_256M); 984 GEM_BUG_ON((dsm_base + dsm_size) > lmem_size); 985 } else { 986 /* Use DSM base address instead for stolen memory */ 987 dsm_base = intel_uncore_read64(uncore, GEN6_DSMBASE) & GEN11_BDSM_MASK; 988 if (WARN_ON(lmem_size < dsm_base)) 989 return ERR_PTR(-ENODEV); 990 dsm_size = ALIGN_DOWN(lmem_size - dsm_base, SZ_1M); 991 } 992 993 if (i915_direct_stolen_access(i915)) { 994 drm_dbg(&i915->drm, "Using direct DSM access\n"); 995 io_start = intel_uncore_read64(uncore, GEN6_DSMBASE) & GEN11_BDSM_MASK; 996 io_size = dsm_size; 997 #ifdef __linux__ 998 } else if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) { 999 io_start = 0; 1000 io_size = 0; 1001 } else { 1002 io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + dsm_base; 1003 io_size = dsm_size; 1004 } 1005 #else 1006 } else if (lmem_len < lmem_size) { 1007 io_start = 0; 1008 io_size = 0; 1009 } else { 1010 io_start = lmem_start + dsm_base; 1011 io_size = dsm_size; 1012 } 1013 #endif 1014 1015 min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K : 1016 I915_GTT_PAGE_SIZE_4K; 1017 1018 mem = intel_memory_region_create(i915, dsm_base, dsm_size, 1019 min_page_size, 1020 io_start, io_size, 1021 type, instance, 1022 &i915_region_stolen_lmem_ops); 1023 if (IS_ERR(mem)) 1024 return mem; 1025 1026 intel_memory_region_set_name(mem, "stolen-local"); 1027 1028 mem->private = true; 1029 1030 return mem; 1031 } 1032 1033 struct intel_memory_region* 1034 i915_gem_stolen_smem_setup(struct drm_i915_private *i915, u16 type, 1035 u16 instance) 1036 { 1037 struct intel_memory_region *mem; 1038 1039 mem = intel_memory_region_create(i915, 1040 intel_graphics_stolen_res.start, 1041 resource_size(&intel_graphics_stolen_res), 1042 PAGE_SIZE, 0, 0, type, instance, 1043 &i915_region_stolen_smem_ops); 1044 if (IS_ERR(mem)) 1045 return mem; 1046 1047 intel_memory_region_set_name(mem, "stolen-system"); 1048 1049 mem->private = true; 1050 1051 return mem; 1052 } 1053 1054 bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj) 1055 { 1056 return obj->ops == &i915_gem_object_stolen_ops; 1057 } 1058 1059 bool i915_gem_stolen_initialized(const struct drm_i915_private *i915) 1060 { 1061 return drm_mm_initialized(&i915->mm.stolen); 1062 } 1063 1064 u64 i915_gem_stolen_area_address(const struct drm_i915_private *i915) 1065 { 1066 return i915->dsm.stolen.start; 1067 } 1068 1069 u64 i915_gem_stolen_area_size(const struct drm_i915_private *i915) 1070 { 1071 return resource_size(&i915->dsm.stolen); 1072 } 1073 1074 u64 i915_gem_stolen_node_address(const struct drm_i915_private *i915, 1075 const struct drm_mm_node *node) 1076 { 1077 return i915->dsm.stolen.start + i915_gem_stolen_node_offset(node); 1078 } 1079 1080 bool i915_gem_stolen_node_allocated(const struct drm_mm_node *node) 1081 { 1082 return drm_mm_node_allocated(node); 1083 } 1084 1085 u64 i915_gem_stolen_node_offset(const struct drm_mm_node *node) 1086 { 1087 return node->start; 1088 } 1089 1090 u64 i915_gem_stolen_node_size(const struct drm_mm_node *node) 1091 { 1092 return node->size; 1093 } 1094