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