1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Low-level direct PCI config space access via ECAM - common code between 4 * i386 and x86-64. 5 * 6 * This code does: 7 * - known chipset handling 8 * - ACPI decoding and validation 9 * 10 * Per-architecture code takes care of the mappings and accesses 11 * themselves. 12 */ 13 14 #define pr_fmt(fmt) "PCI: " fmt 15 16 #include <linux/acpi.h> 17 #include <linux/efi.h> 18 #include <linux/pci.h> 19 #include <linux/init.h> 20 #include <linux/bitmap.h> 21 #include <linux/dmi.h> 22 #include <linux/slab.h> 23 #include <linux/mutex.h> 24 #include <linux/rculist.h> 25 #include <asm/e820/api.h> 26 #include <asm/pci_x86.h> 27 #include <asm/acpi.h> 28 29 /* Indicate if the ECAM resources have been placed into the resource table */ 30 static bool pci_mmcfg_running_state; 31 static bool pci_mmcfg_arch_init_failed; 32 static DEFINE_MUTEX(pci_mmcfg_lock); 33 #define pci_mmcfg_lock_held() lock_is_held(&(pci_mmcfg_lock).dep_map) 34 35 LIST_HEAD(pci_mmcfg_list); 36 37 static void __init pci_mmconfig_remove(struct pci_mmcfg_region *cfg) 38 { 39 if (cfg->res.parent) 40 release_resource(&cfg->res); 41 list_del(&cfg->list); 42 kfree(cfg); 43 } 44 45 static void __init free_all_mmcfg(void) 46 { 47 struct pci_mmcfg_region *cfg, *tmp; 48 49 pci_mmcfg_arch_free(); 50 list_for_each_entry_safe(cfg, tmp, &pci_mmcfg_list, list) 51 pci_mmconfig_remove(cfg); 52 } 53 54 static void list_add_sorted(struct pci_mmcfg_region *new) 55 { 56 struct pci_mmcfg_region *cfg; 57 58 /* keep list sorted by segment and starting bus number */ 59 list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list, pci_mmcfg_lock_held()) { 60 if (cfg->segment > new->segment || 61 (cfg->segment == new->segment && 62 cfg->start_bus >= new->start_bus)) { 63 list_add_tail_rcu(&new->list, &cfg->list); 64 return; 65 } 66 } 67 list_add_tail_rcu(&new->list, &pci_mmcfg_list); 68 } 69 70 static struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start, 71 int end, u64 addr) 72 { 73 struct pci_mmcfg_region *new; 74 struct resource *res; 75 76 if (addr == 0) 77 return NULL; 78 79 new = kzalloc(sizeof(*new), GFP_KERNEL); 80 if (!new) 81 return NULL; 82 83 new->address = addr; 84 new->segment = segment; 85 new->start_bus = start; 86 new->end_bus = end; 87 88 res = &new->res; 89 res->start = addr + PCI_MMCFG_BUS_OFFSET(start); 90 res->end = addr + PCI_MMCFG_BUS_OFFSET(end + 1) - 1; 91 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 92 snprintf(new->name, PCI_MMCFG_RESOURCE_NAME_LEN, 93 "PCI ECAM %04x [bus %02x-%02x]", segment, start, end); 94 res->name = new->name; 95 96 return new; 97 } 98 99 struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start, 100 int end, u64 addr) 101 { 102 struct pci_mmcfg_region *new; 103 104 new = pci_mmconfig_alloc(segment, start, end, addr); 105 if (!new) 106 return NULL; 107 108 mutex_lock(&pci_mmcfg_lock); 109 list_add_sorted(new); 110 mutex_unlock(&pci_mmcfg_lock); 111 112 pr_info("ECAM %pR (base %#lx) for domain %04x [bus %02x-%02x]\n", 113 &new->res, (unsigned long)addr, segment, start, end); 114 115 return new; 116 } 117 118 struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus) 119 { 120 struct pci_mmcfg_region *cfg; 121 122 list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list, pci_mmcfg_lock_held()) 123 if (cfg->segment == segment && 124 cfg->start_bus <= bus && bus <= cfg->end_bus) 125 return cfg; 126 127 return NULL; 128 } 129 130 static const char *__init pci_mmcfg_e7520(void) 131 { 132 u32 win; 133 raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0xce, 2, &win); 134 135 win = win & 0xf000; 136 if (win == 0x0000 || win == 0xf000) 137 return NULL; 138 139 if (pci_mmconfig_add(0, 0, 255, win << 16) == NULL) 140 return NULL; 141 142 return "Intel Corporation E7520 Memory Controller Hub"; 143 } 144 145 static const char *__init pci_mmcfg_intel_945(void) 146 { 147 u32 pciexbar, mask = 0, len = 0; 148 149 raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0x48, 4, &pciexbar); 150 151 /* Enable bit */ 152 if (!(pciexbar & 1)) 153 return NULL; 154 155 /* Size bits */ 156 switch ((pciexbar >> 1) & 3) { 157 case 0: 158 mask = 0xf0000000U; 159 len = 0x10000000U; 160 break; 161 case 1: 162 mask = 0xf8000000U; 163 len = 0x08000000U; 164 break; 165 case 2: 166 mask = 0xfc000000U; 167 len = 0x04000000U; 168 break; 169 default: 170 return NULL; 171 } 172 173 /* Errata #2, things break when not aligned on a 256Mb boundary */ 174 /* Can only happen in 64M/128M mode */ 175 176 if ((pciexbar & mask) & 0x0fffffffU) 177 return NULL; 178 179 /* Don't hit the APIC registers and their friends */ 180 if ((pciexbar & mask) >= 0xf0000000U) 181 return NULL; 182 183 if (pci_mmconfig_add(0, 0, (len >> 20) - 1, pciexbar & mask) == NULL) 184 return NULL; 185 186 return "Intel Corporation 945G/GZ/P/PL Express Memory Controller Hub"; 187 } 188 189 static const char *__init pci_mmcfg_amd_fam10h(void) 190 { 191 u32 low, high, address; 192 u64 base, msr; 193 int i; 194 unsigned segnbits = 0, busnbits, end_bus; 195 196 if (!(pci_probe & PCI_CHECK_ENABLE_AMD_MMCONF)) 197 return NULL; 198 199 address = MSR_FAM10H_MMIO_CONF_BASE; 200 if (rdmsr_safe(address, &low, &high)) 201 return NULL; 202 203 msr = high; 204 msr <<= 32; 205 msr |= low; 206 207 /* ECAM is not enabled */ 208 if (!(msr & FAM10H_MMIO_CONF_ENABLE)) 209 return NULL; 210 211 base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT); 212 213 busnbits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) & 214 FAM10H_MMIO_CONF_BUSRANGE_MASK; 215 216 /* 217 * only handle bus 0 ? 218 * need to skip it 219 */ 220 if (!busnbits) 221 return NULL; 222 223 if (busnbits > 8) { 224 segnbits = busnbits - 8; 225 busnbits = 8; 226 } 227 228 end_bus = (1 << busnbits) - 1; 229 for (i = 0; i < (1 << segnbits); i++) 230 if (pci_mmconfig_add(i, 0, end_bus, 231 base + (1<<28) * i) == NULL) { 232 free_all_mmcfg(); 233 return NULL; 234 } 235 236 return "AMD Family 10h NB"; 237 } 238 239 static bool __initdata mcp55_checked; 240 static const char *__init pci_mmcfg_nvidia_mcp55(void) 241 { 242 int bus; 243 int mcp55_mmconf_found = 0; 244 245 static const u32 extcfg_regnum __initconst = 0x90; 246 static const u32 extcfg_regsize __initconst = 4; 247 static const u32 extcfg_enable_mask __initconst = 1 << 31; 248 static const u32 extcfg_start_mask __initconst = 0xff << 16; 249 static const int extcfg_start_shift __initconst = 16; 250 static const u32 extcfg_size_mask __initconst = 0x3 << 28; 251 static const int extcfg_size_shift __initconst = 28; 252 static const int extcfg_sizebus[] __initconst = { 253 0x100, 0x80, 0x40, 0x20 254 }; 255 static const u32 extcfg_base_mask[] __initconst = { 256 0x7ff8, 0x7ffc, 0x7ffe, 0x7fff 257 }; 258 static const int extcfg_base_lshift __initconst = 25; 259 260 /* 261 * do check if amd fam10h already took over 262 */ 263 if (!acpi_disabled || !list_empty(&pci_mmcfg_list) || mcp55_checked) 264 return NULL; 265 266 mcp55_checked = true; 267 for (bus = 0; bus < 256; bus++) { 268 u64 base; 269 u32 l, extcfg; 270 u16 vendor, device; 271 int start, size_index, end; 272 273 raw_pci_ops->read(0, bus, PCI_DEVFN(0, 0), 0, 4, &l); 274 vendor = l & 0xffff; 275 device = (l >> 16) & 0xffff; 276 277 if (PCI_VENDOR_ID_NVIDIA != vendor || 0x0369 != device) 278 continue; 279 280 raw_pci_ops->read(0, bus, PCI_DEVFN(0, 0), extcfg_regnum, 281 extcfg_regsize, &extcfg); 282 283 if (!(extcfg & extcfg_enable_mask)) 284 continue; 285 286 size_index = (extcfg & extcfg_size_mask) >> extcfg_size_shift; 287 base = extcfg & extcfg_base_mask[size_index]; 288 /* base could > 4G */ 289 base <<= extcfg_base_lshift; 290 start = (extcfg & extcfg_start_mask) >> extcfg_start_shift; 291 end = start + extcfg_sizebus[size_index] - 1; 292 if (pci_mmconfig_add(0, start, end, base) == NULL) 293 continue; 294 mcp55_mmconf_found++; 295 } 296 297 if (!mcp55_mmconf_found) 298 return NULL; 299 300 return "nVidia MCP55"; 301 } 302 303 struct pci_mmcfg_hostbridge_probe { 304 u32 bus; 305 u32 devfn; 306 u32 vendor; 307 u32 device; 308 const char *(*probe)(void); 309 }; 310 311 static const struct pci_mmcfg_hostbridge_probe pci_mmcfg_probes[] __initconst = { 312 { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_INTEL, 313 PCI_DEVICE_ID_INTEL_E7520_MCH, pci_mmcfg_e7520 }, 314 { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_INTEL, 315 PCI_DEVICE_ID_INTEL_82945G_HB, pci_mmcfg_intel_945 }, 316 { 0, PCI_DEVFN(0x18, 0), PCI_VENDOR_ID_AMD, 317 0x1200, pci_mmcfg_amd_fam10h }, 318 { 0xff, PCI_DEVFN(0, 0), PCI_VENDOR_ID_AMD, 319 0x1200, pci_mmcfg_amd_fam10h }, 320 { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_NVIDIA, 321 0x0369, pci_mmcfg_nvidia_mcp55 }, 322 }; 323 324 static void __init pci_mmcfg_check_end_bus_number(void) 325 { 326 struct pci_mmcfg_region *cfg, *cfgx; 327 328 /* Fixup overlaps */ 329 list_for_each_entry(cfg, &pci_mmcfg_list, list) { 330 if (cfg->end_bus < cfg->start_bus) 331 cfg->end_bus = 255; 332 333 /* Don't access the list head ! */ 334 if (cfg->list.next == &pci_mmcfg_list) 335 break; 336 337 cfgx = list_entry(cfg->list.next, typeof(*cfg), list); 338 if (cfg->end_bus >= cfgx->start_bus) 339 cfg->end_bus = cfgx->start_bus - 1; 340 } 341 } 342 343 static int __init pci_mmcfg_check_hostbridge(void) 344 { 345 u32 l; 346 u32 bus, devfn; 347 u16 vendor, device; 348 int i; 349 const char *name; 350 351 if (!raw_pci_ops) 352 return 0; 353 354 free_all_mmcfg(); 355 356 for (i = 0; i < ARRAY_SIZE(pci_mmcfg_probes); i++) { 357 bus = pci_mmcfg_probes[i].bus; 358 devfn = pci_mmcfg_probes[i].devfn; 359 raw_pci_ops->read(0, bus, devfn, 0, 4, &l); 360 vendor = l & 0xffff; 361 device = (l >> 16) & 0xffff; 362 363 name = NULL; 364 if (pci_mmcfg_probes[i].vendor == vendor && 365 pci_mmcfg_probes[i].device == device) 366 name = pci_mmcfg_probes[i].probe(); 367 368 if (name) 369 pr_info("%s with ECAM support\n", name); 370 } 371 372 /* some end_bus_number is crazy, fix it */ 373 pci_mmcfg_check_end_bus_number(); 374 375 return !list_empty(&pci_mmcfg_list); 376 } 377 378 static acpi_status check_mcfg_resource(struct acpi_resource *res, void *data) 379 { 380 struct resource *mcfg_res = data; 381 struct acpi_resource_address64 address; 382 acpi_status status; 383 384 if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) { 385 struct acpi_resource_fixed_memory32 *fixmem32 = 386 &res->data.fixed_memory32; 387 if (!fixmem32) 388 return AE_OK; 389 if ((mcfg_res->start >= fixmem32->address) && 390 (mcfg_res->end < (fixmem32->address + 391 fixmem32->address_length))) { 392 mcfg_res->flags = 1; 393 return AE_CTRL_TERMINATE; 394 } 395 } 396 if ((res->type != ACPI_RESOURCE_TYPE_ADDRESS32) && 397 (res->type != ACPI_RESOURCE_TYPE_ADDRESS64)) 398 return AE_OK; 399 400 status = acpi_resource_to_address64(res, &address); 401 if (ACPI_FAILURE(status) || 402 (address.address.address_length <= 0) || 403 (address.resource_type != ACPI_MEMORY_RANGE)) 404 return AE_OK; 405 406 if ((mcfg_res->start >= address.address.minimum) && 407 (mcfg_res->end < (address.address.minimum + address.address.address_length))) { 408 mcfg_res->flags = 1; 409 return AE_CTRL_TERMINATE; 410 } 411 return AE_OK; 412 } 413 414 static acpi_status find_mboard_resource(acpi_handle handle, u32 lvl, 415 void *context, void **rv) 416 { 417 struct resource *mcfg_res = context; 418 419 acpi_walk_resources(handle, METHOD_NAME__CRS, 420 check_mcfg_resource, context); 421 422 if (mcfg_res->flags) 423 return AE_CTRL_TERMINATE; 424 425 return AE_OK; 426 } 427 428 static bool is_acpi_reserved(u64 start, u64 end, enum e820_type not_used) 429 { 430 struct resource mcfg_res; 431 432 mcfg_res.start = start; 433 mcfg_res.end = end - 1; 434 mcfg_res.flags = 0; 435 436 acpi_get_devices("PNP0C01", find_mboard_resource, &mcfg_res, NULL); 437 438 if (!mcfg_res.flags) 439 acpi_get_devices("PNP0C02", find_mboard_resource, &mcfg_res, 440 NULL); 441 442 return mcfg_res.flags; 443 } 444 445 static bool is_efi_mmio(struct resource *res) 446 { 447 #ifdef CONFIG_EFI 448 u64 start = res->start; 449 u64 end = res->start + resource_size(res); 450 efi_memory_desc_t *md; 451 u64 size, mmio_start, mmio_end; 452 453 for_each_efi_memory_desc(md) { 454 if (md->type == EFI_MEMORY_MAPPED_IO) { 455 size = md->num_pages << EFI_PAGE_SHIFT; 456 mmio_start = md->phys_addr; 457 mmio_end = mmio_start + size; 458 459 if (mmio_start <= start && end <= mmio_end) 460 return true; 461 } 462 } 463 #endif 464 465 return false; 466 } 467 468 typedef bool (*check_reserved_t)(u64 start, u64 end, enum e820_type type); 469 470 static bool __ref is_mmconf_reserved(check_reserved_t is_reserved, 471 struct pci_mmcfg_region *cfg, 472 struct device *dev, const char *method) 473 { 474 u64 addr = cfg->res.start; 475 u64 size = resource_size(&cfg->res); 476 u64 old_size = size; 477 int num_buses; 478 479 while (!is_reserved(addr, addr + size, E820_TYPE_RESERVED)) { 480 size >>= 1; 481 if (size < (16UL<<20)) 482 break; 483 } 484 485 if (size < (16UL<<20) && size != old_size) 486 return false; 487 488 if (dev) 489 dev_info(dev, "ECAM %pR reserved as %s\n", 490 &cfg->res, method); 491 else 492 pr_info("ECAM %pR reserved as %s\n", &cfg->res, method); 493 494 if (old_size != size) { 495 /* update end_bus */ 496 cfg->end_bus = cfg->start_bus + ((size>>20) - 1); 497 num_buses = cfg->end_bus - cfg->start_bus + 1; 498 cfg->res.end = cfg->res.start + 499 PCI_MMCFG_BUS_OFFSET(num_buses) - 1; 500 snprintf(cfg->name, PCI_MMCFG_RESOURCE_NAME_LEN, 501 "PCI ECAM %04x [bus %02x-%02x]", 502 cfg->segment, cfg->start_bus, cfg->end_bus); 503 504 if (dev) 505 dev_info(dev, "ECAM %pR (base %#lx) (size reduced!)\n", 506 &cfg->res, (unsigned long) cfg->address); 507 else 508 pr_info("ECAM %pR (base %#lx) for %04x [bus%02x-%02x] (size reduced!)\n", 509 &cfg->res, (unsigned long) cfg->address, 510 cfg->segment, cfg->start_bus, cfg->end_bus); 511 } 512 513 return true; 514 } 515 516 static bool __ref pci_mmcfg_reserved(struct device *dev, 517 struct pci_mmcfg_region *cfg, int early) 518 { 519 struct resource *conflict; 520 521 if (early) { 522 523 /* 524 * Don't try to do this check unless configuration type 1 525 * is available. How about type 2? 526 */ 527 528 /* 529 * 946f2ee5c731 ("Check that MCFG points to an e820 530 * reserved area") added this E820 check in 2006 to work 531 * around BIOS defects. 532 * 533 * Per PCI Firmware r3.3, sec 4.1.2, ECAM space must be 534 * reserved by a PNP0C02 resource, but it need not be 535 * mentioned in E820. Before the ACPI interpreter is 536 * available, we can't check for PNP0C02 resources, so 537 * there's no reliable way to verify the region in this 538 * early check. Keep it only for the old machines that 539 * motivated 946f2ee5c731. 540 */ 541 if (dmi_get_bios_year() < 2016 && raw_pci_ops) 542 return is_mmconf_reserved(e820__mapped_all, cfg, dev, 543 "E820 entry"); 544 545 return true; 546 } 547 548 if (!acpi_disabled) { 549 if (is_mmconf_reserved(is_acpi_reserved, cfg, dev, 550 "ACPI motherboard resource")) 551 return true; 552 553 if (dev) 554 dev_info(dev, FW_INFO "ECAM %pR not reserved in ACPI motherboard resources\n", 555 &cfg->res); 556 else 557 pr_info(FW_INFO "ECAM %pR not reserved in ACPI motherboard resources\n", 558 &cfg->res); 559 560 if (is_efi_mmio(&cfg->res)) { 561 pr_info("ECAM %pR is EfiMemoryMappedIO; assuming valid\n", 562 &cfg->res); 563 conflict = insert_resource_conflict(&iomem_resource, 564 &cfg->res); 565 if (conflict) 566 pr_warn("ECAM %pR conflicts with %s %pR\n", 567 &cfg->res, conflict->name, conflict); 568 else 569 pr_info("ECAM %pR reserved to work around lack of ACPI motherboard _CRS\n", 570 &cfg->res); 571 return true; 572 } 573 } 574 575 /* 576 * e820__mapped_all() is marked as __init. 577 * All entries from ACPI MCFG table have been checked at boot time. 578 * For MCFG information constructed from hotpluggable host bridge's 579 * _CBA method, just assume it's reserved. 580 */ 581 return pci_mmcfg_running_state; 582 } 583 584 static void __init pci_mmcfg_reject_broken(int early) 585 { 586 struct pci_mmcfg_region *cfg; 587 588 list_for_each_entry(cfg, &pci_mmcfg_list, list) { 589 if (!pci_mmcfg_reserved(NULL, cfg, early)) { 590 pr_info("not using ECAM (%pR not reserved)\n", 591 &cfg->res); 592 free_all_mmcfg(); 593 return; 594 } 595 } 596 } 597 598 static bool __init acpi_mcfg_valid_entry(struct acpi_table_mcfg *mcfg, 599 struct acpi_mcfg_allocation *cfg) 600 { 601 if (cfg->address < 0xFFFFFFFF) 602 return true; 603 604 if (!strncmp(mcfg->header.oem_id, "SGI", 3)) 605 return true; 606 607 if ((mcfg->header.revision >= 1) && (dmi_get_bios_year() >= 2010)) 608 return true; 609 610 pr_err("ECAM at %#llx for %04x [bus %02x-%02x] is above 4GB, ignored\n", 611 cfg->address, cfg->pci_segment, cfg->start_bus_number, 612 cfg->end_bus_number); 613 return false; 614 } 615 616 static int __init pci_parse_mcfg(struct acpi_table_header *header) 617 { 618 struct acpi_table_mcfg *mcfg; 619 struct acpi_mcfg_allocation *cfg_table, *cfg; 620 unsigned long i; 621 int entries; 622 623 if (!header) 624 return -EINVAL; 625 626 mcfg = (struct acpi_table_mcfg *)header; 627 628 /* how many config structures do we have */ 629 free_all_mmcfg(); 630 entries = 0; 631 i = header->length - sizeof(struct acpi_table_mcfg); 632 while (i >= sizeof(struct acpi_mcfg_allocation)) { 633 entries++; 634 i -= sizeof(struct acpi_mcfg_allocation); 635 } 636 if (entries == 0) { 637 pr_err("MCFG has no entries\n"); 638 return -ENODEV; 639 } 640 641 cfg_table = (struct acpi_mcfg_allocation *) &mcfg[1]; 642 for (i = 0; i < entries; i++) { 643 cfg = &cfg_table[i]; 644 if (!acpi_mcfg_valid_entry(mcfg, cfg)) { 645 free_all_mmcfg(); 646 return -ENODEV; 647 } 648 649 if (pci_mmconfig_add(cfg->pci_segment, cfg->start_bus_number, 650 cfg->end_bus_number, cfg->address) == NULL) { 651 pr_warn("no memory for MCFG entries\n"); 652 free_all_mmcfg(); 653 return -ENOMEM; 654 } 655 } 656 657 return 0; 658 } 659 660 #ifdef CONFIG_ACPI_APEI 661 extern int (*arch_apei_filter_addr)(int (*func)(__u64 start, __u64 size, 662 void *data), void *data); 663 664 static int pci_mmcfg_for_each_region(int (*func)(__u64 start, __u64 size, 665 void *data), void *data) 666 { 667 struct pci_mmcfg_region *cfg; 668 int rc; 669 670 if (list_empty(&pci_mmcfg_list)) 671 return 0; 672 673 list_for_each_entry(cfg, &pci_mmcfg_list, list) { 674 rc = func(cfg->res.start, resource_size(&cfg->res), data); 675 if (rc) 676 return rc; 677 } 678 679 return 0; 680 } 681 #define set_apei_filter() (arch_apei_filter_addr = pci_mmcfg_for_each_region) 682 #else 683 #define set_apei_filter() 684 #endif 685 686 static void __init __pci_mmcfg_init(int early) 687 { 688 pr_debug("%s(%s)\n", __func__, early ? "early" : "late"); 689 690 pci_mmcfg_reject_broken(early); 691 if (list_empty(&pci_mmcfg_list)) 692 return; 693 694 if (pcibios_last_bus < 0) { 695 const struct pci_mmcfg_region *cfg; 696 697 list_for_each_entry(cfg, &pci_mmcfg_list, list) { 698 if (cfg->segment) 699 break; 700 pcibios_last_bus = cfg->end_bus; 701 } 702 } 703 704 if (pci_mmcfg_arch_init()) 705 pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF; 706 else { 707 free_all_mmcfg(); 708 pci_mmcfg_arch_init_failed = true; 709 } 710 } 711 712 static int __initdata known_bridge; 713 714 void __init pci_mmcfg_early_init(void) 715 { 716 pr_debug("%s() pci_probe %#x\n", __func__, pci_probe); 717 718 if (pci_probe & PCI_PROBE_MMCONF) { 719 if (pci_mmcfg_check_hostbridge()) 720 known_bridge = 1; 721 else 722 acpi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg); 723 __pci_mmcfg_init(1); 724 725 set_apei_filter(); 726 } 727 } 728 729 void __init pci_mmcfg_late_init(void) 730 { 731 pr_debug("%s() pci_probe %#x\n", __func__, pci_probe); 732 733 /* ECAM disabled */ 734 if ((pci_probe & PCI_PROBE_MMCONF) == 0) 735 return; 736 737 if (known_bridge) 738 return; 739 740 /* ECAM hasn't been enabled yet, try again */ 741 if (pci_probe & PCI_PROBE_MASK & ~PCI_PROBE_MMCONF) { 742 acpi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg); 743 __pci_mmcfg_init(0); 744 } 745 } 746 747 static int __init pci_mmcfg_late_insert_resources(void) 748 { 749 struct pci_mmcfg_region *cfg; 750 751 pci_mmcfg_running_state = true; 752 753 pr_debug("%s() pci_probe %#x\n", __func__, pci_probe); 754 755 /* If we are not using ECAM, don't insert the resources. */ 756 if ((pci_probe & PCI_PROBE_MMCONF) == 0) 757 return 1; 758 759 /* 760 * Attempt to insert the mmcfg resources but not with the busy flag 761 * marked so it won't cause request errors when __request_region is 762 * called. 763 */ 764 list_for_each_entry(cfg, &pci_mmcfg_list, list) { 765 if (!cfg->res.parent) { 766 pr_debug("%s() insert %pR\n", __func__, &cfg->res); 767 insert_resource(&iomem_resource, &cfg->res); 768 } 769 } 770 771 return 0; 772 } 773 774 /* 775 * Perform ECAM resource insertion after PCI initialization to allow for 776 * misprogrammed MCFG tables that state larger sizes but actually conflict 777 * with other system resources. 778 */ 779 late_initcall(pci_mmcfg_late_insert_resources); 780 781 /* Add ECAM information for host bridges */ 782 int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end, 783 phys_addr_t addr) 784 { 785 int rc; 786 struct resource *tmp = NULL; 787 struct pci_mmcfg_region *cfg; 788 789 dev_dbg(dev, "%s(%04x [bus %02x-%02x])\n", __func__, seg, start, end); 790 791 if (!(pci_probe & PCI_PROBE_MMCONF) || pci_mmcfg_arch_init_failed) 792 return -ENODEV; 793 794 if (start > end) 795 return -EINVAL; 796 797 mutex_lock(&pci_mmcfg_lock); 798 cfg = pci_mmconfig_lookup(seg, start); 799 if (cfg) { 800 if (cfg->end_bus < end) 801 dev_info(dev, FW_INFO "ECAM %pR for domain %04x [bus %02x-%02x] only partially covers this bridge\n", 802 &cfg->res, cfg->segment, cfg->start_bus, 803 cfg->end_bus); 804 mutex_unlock(&pci_mmcfg_lock); 805 return -EEXIST; 806 } 807 808 /* 809 * Don't move earlier; we must return -EEXIST, not -EINVAL, if 810 * pci_mmconfig_lookup() finds something 811 */ 812 if (!addr) { 813 mutex_unlock(&pci_mmcfg_lock); 814 return -EINVAL; 815 } 816 817 rc = -EBUSY; 818 cfg = pci_mmconfig_alloc(seg, start, end, addr); 819 if (cfg == NULL) { 820 dev_warn(dev, "fail to add ECAM (out of memory)\n"); 821 rc = -ENOMEM; 822 } else if (!pci_mmcfg_reserved(dev, cfg, 0)) { 823 dev_warn(dev, FW_BUG "ECAM %pR isn't reserved\n", 824 &cfg->res); 825 } else { 826 /* Insert resource if it's not in boot stage */ 827 if (pci_mmcfg_running_state) 828 tmp = insert_resource_conflict(&iomem_resource, 829 &cfg->res); 830 831 if (tmp) { 832 dev_warn(dev, "ECAM %pR conflicts with %s %pR\n", 833 &cfg->res, tmp->name, tmp); 834 } else if (pci_mmcfg_arch_map(cfg)) { 835 dev_warn(dev, "fail to map ECAM %pR\n", &cfg->res); 836 } else { 837 list_add_sorted(cfg); 838 dev_info(dev, "ECAM %pR (base %#lx)\n", 839 &cfg->res, (unsigned long)addr); 840 cfg = NULL; 841 rc = 0; 842 } 843 } 844 845 if (cfg) { 846 if (cfg->res.parent) 847 release_resource(&cfg->res); 848 kfree(cfg); 849 } 850 851 mutex_unlock(&pci_mmcfg_lock); 852 853 return rc; 854 } 855 856 /* Delete ECAM information for host bridges */ 857 int pci_mmconfig_delete(u16 seg, u8 start, u8 end) 858 { 859 struct pci_mmcfg_region *cfg; 860 861 mutex_lock(&pci_mmcfg_lock); 862 list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) 863 if (cfg->segment == seg && cfg->start_bus == start && 864 cfg->end_bus == end) { 865 list_del_rcu(&cfg->list); 866 synchronize_rcu(); 867 pci_mmcfg_arch_unmap(cfg); 868 if (cfg->res.parent) 869 release_resource(&cfg->res); 870 mutex_unlock(&pci_mmcfg_lock); 871 kfree(cfg); 872 return 0; 873 } 874 mutex_unlock(&pci_mmcfg_lock); 875 876 return -ENOENT; 877 } 878