1/* 2 * mmconfig-shared.c - Low-level direct PCI config space access via 3 * MMCONFIG - common code between i386 and x86-64. 4 * 5 * This code does: 6 * - known chipset handling 7 * - ACPI decoding and validation 8 * 9 * Per-architecture code takes care of the mappings and accesses 10 * themselves. 11 */ 12 13#include <linux/pci.h> 14#include <linux/init.h> 15#include <linux/sfi_acpi.h> 16#include <linux/bitmap.h> 17#include <linux/dmi.h> 18#include <linux/slab.h> 19#include <linux/mutex.h> 20#include <linux/rculist.h> 21#include <asm/e820.h> 22#include <asm/pci_x86.h> 23#include <asm/acpi.h> 24 25#define PREFIX "PCI: " 26 27/* Indicate if the mmcfg resources have been placed into the resource table. */ 28static bool pci_mmcfg_running_state; 29static bool pci_mmcfg_arch_init_failed; 30static DEFINE_MUTEX(pci_mmcfg_lock); 31 32LIST_HEAD(pci_mmcfg_list); 33 34static void __init pci_mmconfig_remove(struct pci_mmcfg_region *cfg) 35{ 36 if (cfg->res.parent) 37 release_resource(&cfg->res); 38 list_del(&cfg->list); 39 kfree(cfg); 40} 41 42static void __init free_all_mmcfg(void) 43{ 44 struct pci_mmcfg_region *cfg, *tmp; 45 46 pci_mmcfg_arch_free(); 47 list_for_each_entry_safe(cfg, tmp, &pci_mmcfg_list, list) 48 pci_mmconfig_remove(cfg); 49} 50 51static void list_add_sorted(struct pci_mmcfg_region *new) 52{ 53 struct pci_mmcfg_region *cfg; 54 55 /* keep list sorted by segment and starting bus number */ 56 list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) { 57 if (cfg->segment > new->segment || 58 (cfg->segment == new->segment && 59 cfg->start_bus >= new->start_bus)) { 60 list_add_tail_rcu(&new->list, &cfg->list); 61 return; 62 } 63 } 64 list_add_tail_rcu(&new->list, &pci_mmcfg_list); 65} 66 67static struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start, 68 int end, u64 addr) 69{ 70 struct pci_mmcfg_region *new; 71 struct resource *res; 72 73 if (addr == 0) 74 return NULL; 75 76 new = kzalloc(sizeof(*new), GFP_KERNEL); 77 if (!new) 78 return NULL; 79 80 new->address = addr; 81 new->segment = segment; 82 new->start_bus = start; 83 new->end_bus = end; 84 85 res = &new->res; 86 res->start = addr + PCI_MMCFG_BUS_OFFSET(start); 87 res->end = addr + PCI_MMCFG_BUS_OFFSET(end + 1) - 1; 88 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 89 snprintf(new->name, PCI_MMCFG_RESOURCE_NAME_LEN, 90 "PCI MMCONFIG %04x [bus %02x-%02x]", segment, start, end); 91 res->name = new->name; 92 93 return new; 94} 95 96static struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start, 97 int end, u64 addr) 98{ 99 struct pci_mmcfg_region *new; 100 101 new = pci_mmconfig_alloc(segment, start, end, addr); 102 if (new) { 103 mutex_lock(&pci_mmcfg_lock); 104 list_add_sorted(new); 105 mutex_unlock(&pci_mmcfg_lock); 106 107 pr_info(PREFIX 108 "MMCONFIG for domain %04x [bus %02x-%02x] at %pR " 109 "(base %#lx)\n", 110 segment, start, end, &new->res, (unsigned long)addr); 111 } 112 113 return new; 114} 115 116struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus) 117{ 118 struct pci_mmcfg_region *cfg; 119 120 list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) 121 if (cfg->segment == segment && 122 cfg->start_bus <= bus && bus <= cfg->end_bus) 123 return cfg; 124 125 return NULL; 126} 127 128static const char *__init pci_mmcfg_e7520(void) 129{ 130 u32 win; 131 raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0xce, 2, &win); 132 133 win = win & 0xf000; 134 if (win == 0x0000 || win == 0xf000) 135 return NULL; 136 137 if (pci_mmconfig_add(0, 0, 255, win << 16) == NULL) 138 return NULL; 139 140 return "Intel Corporation E7520 Memory Controller Hub"; 141} 142 143static const char *__init pci_mmcfg_intel_945(void) 144{ 145 u32 pciexbar, mask = 0, len = 0; 146 147 raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0x48, 4, &pciexbar); 148 149 /* Enable bit */ 150 if (!(pciexbar & 1)) 151 return NULL; 152 153 /* Size bits */ 154 switch ((pciexbar >> 1) & 3) { 155 case 0: 156 mask = 0xf0000000U; 157 len = 0x10000000U; 158 break; 159 case 1: 160 mask = 0xf8000000U; 161 len = 0x08000000U; 162 break; 163 case 2: 164 mask = 0xfc000000U; 165 len = 0x04000000U; 166 break; 167 default: 168 return NULL; 169 } 170 171 /* Errata #2, things break when not aligned on a 256Mb boundary */ 172 /* Can only happen in 64M/128M mode */ 173 174 if ((pciexbar & mask) & 0x0fffffffU) 175 return NULL; 176 177 /* Don't hit the APIC registers and their friends */ 178 if ((pciexbar & mask) >= 0xf0000000U) 179 return NULL; 180 181 if (pci_mmconfig_add(0, 0, (len >> 20) - 1, pciexbar & mask) == NULL) 182 return NULL; 183 184 return "Intel Corporation 945G/GZ/P/PL Express Memory Controller Hub"; 185} 186 187static const char *__init pci_mmcfg_amd_fam10h(void) 188{ 189 u32 low, high, address; 190 u64 base, msr; 191 int i; 192 unsigned segnbits = 0, busnbits, end_bus; 193 194 if (!(pci_probe & PCI_CHECK_ENABLE_AMD_MMCONF)) 195 return NULL; 196 197 address = MSR_FAM10H_MMIO_CONF_BASE; 198 if (rdmsr_safe(address, &low, &high)) 199 return NULL; 200 201 msr = high; 202 msr <<= 32; 203 msr |= low; 204 205 /* mmconfig is not enable */ 206 if (!(msr & FAM10H_MMIO_CONF_ENABLE)) 207 return NULL; 208 209 base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT); 210 211 busnbits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) & 212 FAM10H_MMIO_CONF_BUSRANGE_MASK; 213 214 /* 215 * only handle bus 0 ? 216 * need to skip it 217 */ 218 if (!busnbits) 219 return NULL; 220 221 if (busnbits > 8) { 222 segnbits = busnbits - 8; 223 busnbits = 8; 224 } 225 226 end_bus = (1 << busnbits) - 1; 227 for (i = 0; i < (1 << segnbits); i++) 228 if (pci_mmconfig_add(i, 0, end_bus, 229 base + (1<<28) * i) == NULL) { 230 free_all_mmcfg(); 231 return NULL; 232 } 233 234 return "AMD Family 10h NB"; 235} 236 237static bool __initdata mcp55_checked; 238static const char *__init pci_mmcfg_nvidia_mcp55(void) 239{ 240 int bus; 241 int mcp55_mmconf_found = 0; 242 243 static const u32 extcfg_regnum __initconst = 0x90; 244 static const u32 extcfg_regsize __initconst = 4; 245 static const u32 extcfg_enable_mask __initconst = 1 << 31; 246 static const u32 extcfg_start_mask __initconst = 0xff << 16; 247 static const int extcfg_start_shift __initconst = 16; 248 static const u32 extcfg_size_mask __initconst = 0x3 << 28; 249 static const int extcfg_size_shift __initconst = 28; 250 static const int extcfg_sizebus[] __initconst = { 251 0x100, 0x80, 0x40, 0x20 252 }; 253 static const u32 extcfg_base_mask[] __initconst = { 254 0x7ff8, 0x7ffc, 0x7ffe, 0x7fff 255 }; 256 static const int extcfg_base_lshift __initconst = 25; 257 258 /* 259 * do check if amd fam10h already took over 260 */ 261 if (!acpi_disabled || !list_empty(&pci_mmcfg_list) || mcp55_checked) 262 return NULL; 263 264 mcp55_checked = true; 265 for (bus = 0; bus < 256; bus++) { 266 u64 base; 267 u32 l, extcfg; 268 u16 vendor, device; 269 int start, size_index, end; 270 271 raw_pci_ops->read(0, bus, PCI_DEVFN(0, 0), 0, 4, &l); 272 vendor = l & 0xffff; 273 device = (l >> 16) & 0xffff; 274 275 if (PCI_VENDOR_ID_NVIDIA != vendor || 0x0369 != device) 276 continue; 277 278 raw_pci_ops->read(0, bus, PCI_DEVFN(0, 0), extcfg_regnum, 279 extcfg_regsize, &extcfg); 280 281 if (!(extcfg & extcfg_enable_mask)) 282 continue; 283 284 size_index = (extcfg & extcfg_size_mask) >> extcfg_size_shift; 285 base = extcfg & extcfg_base_mask[size_index]; 286 /* base could > 4G */ 287 base <<= extcfg_base_lshift; 288 start = (extcfg & extcfg_start_mask) >> extcfg_start_shift; 289 end = start + extcfg_sizebus[size_index] - 1; 290 if (pci_mmconfig_add(0, start, end, base) == NULL) 291 continue; 292 mcp55_mmconf_found++; 293 } 294 295 if (!mcp55_mmconf_found) 296 return NULL; 297 298 return "nVidia MCP55"; 299} 300 301struct pci_mmcfg_hostbridge_probe { 302 u32 bus; 303 u32 devfn; 304 u32 vendor; 305 u32 device; 306 const char *(*probe)(void); 307}; 308 309static const struct pci_mmcfg_hostbridge_probe pci_mmcfg_probes[] __initconst = { 310 { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_INTEL, 311 PCI_DEVICE_ID_INTEL_E7520_MCH, pci_mmcfg_e7520 }, 312 { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_INTEL, 313 PCI_DEVICE_ID_INTEL_82945G_HB, pci_mmcfg_intel_945 }, 314 { 0, PCI_DEVFN(0x18, 0), PCI_VENDOR_ID_AMD, 315 0x1200, pci_mmcfg_amd_fam10h }, 316 { 0xff, PCI_DEVFN(0, 0), PCI_VENDOR_ID_AMD, 317 0x1200, pci_mmcfg_amd_fam10h }, 318 { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_NVIDIA, 319 0x0369, pci_mmcfg_nvidia_mcp55 }, 320}; 321 322static void __init pci_mmcfg_check_end_bus_number(void) 323{ 324 struct pci_mmcfg_region *cfg, *cfgx; 325 326 /* Fixup overlaps */ 327 list_for_each_entry(cfg, &pci_mmcfg_list, list) { 328 if (cfg->end_bus < cfg->start_bus) 329 cfg->end_bus = 255; 330 331 /* Don't access the list head ! */ 332 if (cfg->list.next == &pci_mmcfg_list) 333 break; 334 335 cfgx = list_entry(cfg->list.next, typeof(*cfg), list); 336 if (cfg->end_bus >= cfgx->start_bus) 337 cfg->end_bus = cfgx->start_bus - 1; 338 } 339} 340 341static int __init pci_mmcfg_check_hostbridge(void) 342{ 343 u32 l; 344 u32 bus, devfn; 345 u16 vendor, device; 346 int i; 347 const char *name; 348 349 if (!raw_pci_ops) 350 return 0; 351 352 free_all_mmcfg(); 353 354 for (i = 0; i < ARRAY_SIZE(pci_mmcfg_probes); i++) { 355 bus = pci_mmcfg_probes[i].bus; 356 devfn = pci_mmcfg_probes[i].devfn; 357 raw_pci_ops->read(0, bus, devfn, 0, 4, &l); 358 vendor = l & 0xffff; 359 device = (l >> 16) & 0xffff; 360 361 name = NULL; 362 if (pci_mmcfg_probes[i].vendor == vendor && 363 pci_mmcfg_probes[i].device == device) 364 name = pci_mmcfg_probes[i].probe(); 365 366 if (name) 367 pr_info(PREFIX "%s with MMCONFIG support\n", name); 368 } 369 370 /* some end_bus_number is crazy, fix it */ 371 pci_mmcfg_check_end_bus_number(); 372 373 return !list_empty(&pci_mmcfg_list); 374} 375 376static acpi_status check_mcfg_resource(struct acpi_resource *res, void *data) 377{ 378 struct resource *mcfg_res = data; 379 struct acpi_resource_address64 address; 380 acpi_status status; 381 382 if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) { 383 struct acpi_resource_fixed_memory32 *fixmem32 = 384 &res->data.fixed_memory32; 385 if (!fixmem32) 386 return AE_OK; 387 if ((mcfg_res->start >= fixmem32->address) && 388 (mcfg_res->end < (fixmem32->address + 389 fixmem32->address_length))) { 390 mcfg_res->flags = 1; 391 return AE_CTRL_TERMINATE; 392 } 393 } 394 if ((res->type != ACPI_RESOURCE_TYPE_ADDRESS32) && 395 (res->type != ACPI_RESOURCE_TYPE_ADDRESS64)) 396 return AE_OK; 397 398 status = acpi_resource_to_address64(res, &address); 399 if (ACPI_FAILURE(status) || 400 (address.address_length <= 0) || 401 (address.resource_type != ACPI_MEMORY_RANGE)) 402 return AE_OK; 403 404 if ((mcfg_res->start >= address.minimum) && 405 (mcfg_res->end < (address.minimum + address.address_length))) { 406 mcfg_res->flags = 1; 407 return AE_CTRL_TERMINATE; 408 } 409 return AE_OK; 410} 411 412static acpi_status find_mboard_resource(acpi_handle handle, u32 lvl, 413 void *context, void **rv) 414{ 415 struct resource *mcfg_res = context; 416 417 acpi_walk_resources(handle, METHOD_NAME__CRS, 418 check_mcfg_resource, context); 419 420 if (mcfg_res->flags) 421 return AE_CTRL_TERMINATE; 422 423 return AE_OK; 424} 425 426static int is_acpi_reserved(u64 start, u64 end, unsigned not_used) 427{ 428 struct resource mcfg_res; 429 430 mcfg_res.start = start; 431 mcfg_res.end = end - 1; 432 mcfg_res.flags = 0; 433 434 acpi_get_devices("PNP0C01", find_mboard_resource, &mcfg_res, NULL); 435 436 if (!mcfg_res.flags) 437 acpi_get_devices("PNP0C02", find_mboard_resource, &mcfg_res, 438 NULL); 439 440 return mcfg_res.flags; 441} 442 443typedef int (*check_reserved_t)(u64 start, u64 end, unsigned type); 444 445static int __ref is_mmconf_reserved(check_reserved_t is_reserved, 446 struct pci_mmcfg_region *cfg, 447 struct device *dev, int with_e820) 448{ 449 u64 addr = cfg->res.start; 450 u64 size = resource_size(&cfg->res); 451 u64 old_size = size; 452 int num_buses; 453 char *method = with_e820 ? "E820" : "ACPI motherboard resources"; 454 455 while (!is_reserved(addr, addr + size, E820_RESERVED)) { 456 size >>= 1; 457 if (size < (16UL<<20)) 458 break; 459 } 460 461 if (size < (16UL<<20) && size != old_size) 462 return 0; 463 464 if (dev) 465 dev_info(dev, "MMCONFIG at %pR reserved in %s\n", 466 &cfg->res, method); 467 else 468 pr_info(PREFIX "MMCONFIG at %pR reserved in %s\n", 469 &cfg->res, method); 470 471 if (old_size != size) { 472 /* update end_bus */ 473 cfg->end_bus = cfg->start_bus + ((size>>20) - 1); 474 num_buses = cfg->end_bus - cfg->start_bus + 1; 475 cfg->res.end = cfg->res.start + 476 PCI_MMCFG_BUS_OFFSET(num_buses) - 1; 477 snprintf(cfg->name, PCI_MMCFG_RESOURCE_NAME_LEN, 478 "PCI MMCONFIG %04x [bus %02x-%02x]", 479 cfg->segment, cfg->start_bus, cfg->end_bus); 480 481 if (dev) 482 dev_info(dev, 483 "MMCONFIG " 484 "at %pR (base %#lx) (size reduced!)\n", 485 &cfg->res, (unsigned long) cfg->address); 486 else 487 pr_info(PREFIX 488 "MMCONFIG for %04x [bus%02x-%02x] " 489 "at %pR (base %#lx) (size reduced!)\n", 490 cfg->segment, cfg->start_bus, cfg->end_bus, 491 &cfg->res, (unsigned long) cfg->address); 492 } 493 494 return 1; 495} 496 497static int __ref pci_mmcfg_check_reserved(struct device *dev, 498 struct pci_mmcfg_region *cfg, int early) 499{ 500 if (!early && !acpi_disabled) { 501 if (is_mmconf_reserved(is_acpi_reserved, cfg, dev, 0)) 502 return 1; 503 504 if (dev) 505 dev_info(dev, FW_INFO 506 "MMCONFIG at %pR not reserved in " 507 "ACPI motherboard resources\n", 508 &cfg->res); 509 else 510 pr_info(FW_INFO PREFIX 511 "MMCONFIG at %pR not reserved in " 512 "ACPI motherboard resources\n", 513 &cfg->res); 514 } 515 516 /* 517 * e820_all_mapped() is marked as __init. 518 * All entries from ACPI MCFG table have been checked at boot time. 519 * For MCFG information constructed from hotpluggable host bridge's 520 * _CBA method, just assume it's reserved. 521 */ 522 if (pci_mmcfg_running_state) 523 return 1; 524 525 /* Don't try to do this check unless configuration 526 type 1 is available. how about type 2 ?*/ 527 if (raw_pci_ops) 528 return is_mmconf_reserved(e820_all_mapped, cfg, dev, 1); 529 530 return 0; 531} 532 533static void __init pci_mmcfg_reject_broken(int early) 534{ 535 struct pci_mmcfg_region *cfg; 536 537 list_for_each_entry(cfg, &pci_mmcfg_list, list) { 538 if (pci_mmcfg_check_reserved(NULL, cfg, early) == 0) { 539 pr_info(PREFIX "not using MMCONFIG\n"); 540 free_all_mmcfg(); 541 return; 542 } 543 } 544} 545 546static int __init acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg, 547 struct acpi_mcfg_allocation *cfg) 548{ 549 int year; 550 551 if (cfg->address < 0xFFFFFFFF) 552 return 0; 553 554 if (!strncmp(mcfg->header.oem_id, "SGI", 3)) 555 return 0; 556 557 if (mcfg->header.revision >= 1) { 558 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && 559 year >= 2010) 560 return 0; 561 } 562 563 pr_err(PREFIX "MCFG region for %04x [bus %02x-%02x] at %#llx " 564 "is above 4GB, ignored\n", cfg->pci_segment, 565 cfg->start_bus_number, cfg->end_bus_number, cfg->address); 566 return -EINVAL; 567} 568 569static int __init pci_parse_mcfg(struct acpi_table_header *header) 570{ 571 struct acpi_table_mcfg *mcfg; 572 struct acpi_mcfg_allocation *cfg_table, *cfg; 573 unsigned long i; 574 int entries; 575 576 if (!header) 577 return -EINVAL; 578 579 mcfg = (struct acpi_table_mcfg *)header; 580 581 /* how many config structures do we have */ 582 free_all_mmcfg(); 583 entries = 0; 584 i = header->length - sizeof(struct acpi_table_mcfg); 585 while (i >= sizeof(struct acpi_mcfg_allocation)) { 586 entries++; 587 i -= sizeof(struct acpi_mcfg_allocation); 588 } 589 if (entries == 0) { 590 pr_err(PREFIX "MMCONFIG has no entries\n"); 591 return -ENODEV; 592 } 593 594 cfg_table = (struct acpi_mcfg_allocation *) &mcfg[1]; 595 for (i = 0; i < entries; i++) { 596 cfg = &cfg_table[i]; 597 if (acpi_mcfg_check_entry(mcfg, cfg)) { 598 free_all_mmcfg(); 599 return -ENODEV; 600 } 601 602 if (pci_mmconfig_add(cfg->pci_segment, cfg->start_bus_number, 603 cfg->end_bus_number, cfg->address) == NULL) { 604 pr_warn(PREFIX "no memory for MCFG entries\n"); 605 free_all_mmcfg(); 606 return -ENOMEM; 607 } 608 } 609 610 return 0; 611} 612 613static void __init __pci_mmcfg_init(int early) 614{ 615 pci_mmcfg_reject_broken(early); 616 if (list_empty(&pci_mmcfg_list)) 617 return; 618 619 if (pcibios_last_bus < 0) { 620 const struct pci_mmcfg_region *cfg; 621 622 list_for_each_entry(cfg, &pci_mmcfg_list, list) { 623 if (cfg->segment) 624 break; 625 pcibios_last_bus = cfg->end_bus; 626 } 627 } 628 629 if (pci_mmcfg_arch_init()) 630 pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF; 631 else { 632 free_all_mmcfg(); 633 pci_mmcfg_arch_init_failed = true; 634 } 635} 636 637static int __initdata known_bridge; 638 639void __init pci_mmcfg_early_init(void) 640{ 641 if (pci_probe & PCI_PROBE_MMCONF) { 642 if (pci_mmcfg_check_hostbridge()) 643 known_bridge = 1; 644 else 645 acpi_sfi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg); 646 __pci_mmcfg_init(1); 647 } 648} 649 650void __init pci_mmcfg_late_init(void) 651{ 652 /* MMCONFIG disabled */ 653 if ((pci_probe & PCI_PROBE_MMCONF) == 0) 654 return; 655 656 if (known_bridge) 657 return; 658 659 /* MMCONFIG hasn't been enabled yet, try again */ 660 if (pci_probe & PCI_PROBE_MASK & ~PCI_PROBE_MMCONF) { 661 acpi_sfi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg); 662 __pci_mmcfg_init(0); 663 } 664} 665 666static int __init pci_mmcfg_late_insert_resources(void) 667{ 668 struct pci_mmcfg_region *cfg; 669 670 pci_mmcfg_running_state = true; 671 672 /* If we are not using MMCONFIG, don't insert the resources. */ 673 if ((pci_probe & PCI_PROBE_MMCONF) == 0) 674 return 1; 675 676 /* 677 * Attempt to insert the mmcfg resources but not with the busy flag 678 * marked so it won't cause request errors when __request_region is 679 * called. 680 */ 681 list_for_each_entry(cfg, &pci_mmcfg_list, list) 682 if (!cfg->res.parent) 683 insert_resource(&iomem_resource, &cfg->res); 684 685 return 0; 686} 687 688/* 689 * Perform MMCONFIG resource insertion after PCI initialization to allow for 690 * misprogrammed MCFG tables that state larger sizes but actually conflict 691 * with other system resources. 692 */ 693late_initcall(pci_mmcfg_late_insert_resources); 694 695/* Add MMCFG information for host bridges */ 696int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end, 697 phys_addr_t addr) 698{ 699 int rc; 700 struct resource *tmp = NULL; 701 struct pci_mmcfg_region *cfg; 702 703 if (!(pci_probe & PCI_PROBE_MMCONF) || pci_mmcfg_arch_init_failed) 704 return -ENODEV; 705 706 if (start > end) 707 return -EINVAL; 708 709 mutex_lock(&pci_mmcfg_lock); 710 cfg = pci_mmconfig_lookup(seg, start); 711 if (cfg) { 712 if (cfg->end_bus < end) 713 dev_info(dev, FW_INFO 714 "MMCONFIG for " 715 "domain %04x [bus %02x-%02x] " 716 "only partially covers this bridge\n", 717 cfg->segment, cfg->start_bus, cfg->end_bus); 718 mutex_unlock(&pci_mmcfg_lock); 719 return -EEXIST; 720 } 721 722 if (!addr) { 723 mutex_unlock(&pci_mmcfg_lock); 724 return -EINVAL; 725 } 726 727 rc = -EBUSY; 728 cfg = pci_mmconfig_alloc(seg, start, end, addr); 729 if (cfg == NULL) { 730 dev_warn(dev, "fail to add MMCONFIG (out of memory)\n"); 731 rc = -ENOMEM; 732 } else if (!pci_mmcfg_check_reserved(dev, cfg, 0)) { 733 dev_warn(dev, FW_BUG "MMCONFIG %pR isn't reserved\n", 734 &cfg->res); 735 } else { 736 /* Insert resource if it's not in boot stage */ 737 if (pci_mmcfg_running_state) 738 tmp = insert_resource_conflict(&iomem_resource, 739 &cfg->res); 740 741 if (tmp) { 742 dev_warn(dev, 743 "MMCONFIG %pR conflicts with " 744 "%s %pR\n", 745 &cfg->res, tmp->name, tmp); 746 } else if (pci_mmcfg_arch_map(cfg)) { 747 dev_warn(dev, "fail to map MMCONFIG %pR.\n", 748 &cfg->res); 749 } else { 750 list_add_sorted(cfg); 751 dev_info(dev, "MMCONFIG at %pR (base %#lx)\n", 752 &cfg->res, (unsigned long)addr); 753 cfg = NULL; 754 rc = 0; 755 } 756 } 757 758 if (cfg) { 759 if (cfg->res.parent) 760 release_resource(&cfg->res); 761 kfree(cfg); 762 } 763 764 mutex_unlock(&pci_mmcfg_lock); 765 766 return rc; 767} 768 769/* Delete MMCFG information for host bridges */ 770int pci_mmconfig_delete(u16 seg, u8 start, u8 end) 771{ 772 struct pci_mmcfg_region *cfg; 773 774 mutex_lock(&pci_mmcfg_lock); 775 list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) 776 if (cfg->segment == seg && cfg->start_bus == start && 777 cfg->end_bus == end) { 778 list_del_rcu(&cfg->list); 779 synchronize_rcu(); 780 pci_mmcfg_arch_unmap(cfg); 781 if (cfg->res.parent) 782 release_resource(&cfg->res); 783 mutex_unlock(&pci_mmcfg_lock); 784 kfree(cfg); 785 return 0; 786 } 787 mutex_unlock(&pci_mmcfg_lock); 788 789 return -ENOENT; 790} 791