1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Low-Level PCI Support for PC 4 * 5 * (c) 1999--2000 Martin Mares <mj@ucw.cz> 6 */ 7 8 #include <linux/sched.h> 9 #include <linux/pci.h> 10 #include <linux/pci-acpi.h> 11 #include <linux/ioport.h> 12 #include <linux/init.h> 13 #include <linux/dmi.h> 14 #include <linux/slab.h> 15 16 #include <asm/acpi.h> 17 #include <asm/segment.h> 18 #include <asm/io.h> 19 #include <asm/smp.h> 20 #include <asm/pci_x86.h> 21 #include <asm/setup.h> 22 #include <asm/irqdomain.h> 23 24 unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 | 25 PCI_PROBE_MMCONF; 26 27 static int pci_bf_sort; 28 int pci_routeirq; 29 int noioapicquirk; 30 #ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS 31 int noioapicreroute = 0; 32 #else 33 int noioapicreroute = 1; 34 #endif 35 int pcibios_last_bus = -1; 36 unsigned long pirq_table_addr; 37 const struct pci_raw_ops *__read_mostly raw_pci_ops; 38 const struct pci_raw_ops *__read_mostly raw_pci_ext_ops; 39 40 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn, 41 int reg, int len, u32 *val) 42 { 43 if (domain == 0 && reg < 256 && raw_pci_ops) 44 return raw_pci_ops->read(domain, bus, devfn, reg, len, val); 45 if (raw_pci_ext_ops) 46 return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val); 47 return -EINVAL; 48 } 49 50 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn, 51 int reg, int len, u32 val) 52 { 53 if (domain == 0 && reg < 256 && raw_pci_ops) 54 return raw_pci_ops->write(domain, bus, devfn, reg, len, val); 55 if (raw_pci_ext_ops) 56 return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val); 57 return -EINVAL; 58 } 59 60 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value) 61 { 62 return raw_pci_read(pci_domain_nr(bus), bus->number, 63 devfn, where, size, value); 64 } 65 66 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value) 67 { 68 return raw_pci_write(pci_domain_nr(bus), bus->number, 69 devfn, where, size, value); 70 } 71 72 struct pci_ops pci_root_ops = { 73 .read = pci_read, 74 .write = pci_write, 75 }; 76 77 /* 78 * This interrupt-safe spinlock protects all accesses to PCI configuration 79 * space, except for the mmconfig (ECAM) based operations. 80 */ 81 DEFINE_RAW_SPINLOCK(pci_config_lock); 82 83 static int __init can_skip_ioresource_align(const struct dmi_system_id *d) 84 { 85 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN; 86 printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident); 87 return 0; 88 } 89 90 static const struct dmi_system_id can_skip_pciprobe_dmi_table[] __initconst = { 91 /* 92 * Systems where PCI IO resource ISA alignment can be skipped 93 * when the ISA enable bit in the bridge control is not set 94 */ 95 { 96 .callback = can_skip_ioresource_align, 97 .ident = "IBM System x3800", 98 .matches = { 99 DMI_MATCH(DMI_SYS_VENDOR, "IBM"), 100 DMI_MATCH(DMI_PRODUCT_NAME, "x3800"), 101 }, 102 }, 103 { 104 .callback = can_skip_ioresource_align, 105 .ident = "IBM System x3850", 106 .matches = { 107 DMI_MATCH(DMI_SYS_VENDOR, "IBM"), 108 DMI_MATCH(DMI_PRODUCT_NAME, "x3850"), 109 }, 110 }, 111 { 112 .callback = can_skip_ioresource_align, 113 .ident = "IBM System x3950", 114 .matches = { 115 DMI_MATCH(DMI_SYS_VENDOR, "IBM"), 116 DMI_MATCH(DMI_PRODUCT_NAME, "x3950"), 117 }, 118 }, 119 {} 120 }; 121 122 void __init dmi_check_skip_isa_align(void) 123 { 124 dmi_check_system(can_skip_pciprobe_dmi_table); 125 } 126 127 static void pcibios_fixup_device_resources(struct pci_dev *dev) 128 { 129 struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE]; 130 struct resource *bar_r; 131 int bar; 132 133 if (pci_probe & PCI_NOASSIGN_BARS) { 134 /* 135 * If the BIOS did not assign the BAR, zero out the 136 * resource so the kernel doesn't attempt to assign 137 * it later on in pci_assign_unassigned_resources 138 */ 139 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) { 140 bar_r = &dev->resource[bar]; 141 if (bar_r->start == 0 && bar_r->end != 0) { 142 bar_r->flags = 0; 143 bar_r->end = 0; 144 } 145 } 146 } 147 148 if (pci_probe & PCI_NOASSIGN_ROMS) { 149 if (rom_r->parent) 150 return; 151 if (rom_r->start) { 152 /* we deal with BIOS assigned ROM later */ 153 return; 154 } 155 rom_r->start = rom_r->end = rom_r->flags = 0; 156 } 157 } 158 159 /* 160 * Called after each bus is probed, but before its children 161 * are examined. 162 */ 163 164 void pcibios_fixup_bus(struct pci_bus *b) 165 { 166 struct pci_dev *dev; 167 168 pci_read_bridge_bases(b); 169 list_for_each_entry(dev, &b->devices, bus_list) 170 pcibios_fixup_device_resources(dev); 171 } 172 173 void pcibios_add_bus(struct pci_bus *bus) 174 { 175 acpi_pci_add_bus(bus); 176 } 177 178 void pcibios_remove_bus(struct pci_bus *bus) 179 { 180 acpi_pci_remove_bus(bus); 181 } 182 183 /* 184 * Only use DMI information to set this if nothing was passed 185 * on the kernel command line (which was parsed earlier). 186 */ 187 188 static int __init set_bf_sort(const struct dmi_system_id *d) 189 { 190 if (pci_bf_sort == pci_bf_sort_default) { 191 pci_bf_sort = pci_dmi_bf; 192 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident); 193 } 194 return 0; 195 } 196 197 static void __init read_dmi_type_b1(const struct dmi_header *dm, 198 void *private_data) 199 { 200 u8 *data = (u8 *)dm + 4; 201 202 if (dm->type != 0xB1) 203 return; 204 if ((((*(u32 *)data) >> 9) & 0x03) == 0x01) 205 set_bf_sort((const struct dmi_system_id *)private_data); 206 } 207 208 static int __init find_sort_method(const struct dmi_system_id *d) 209 { 210 dmi_walk(read_dmi_type_b1, (void *)d); 211 return 0; 212 } 213 214 /* 215 * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus) 216 */ 217 #ifdef __i386__ 218 static int __init assign_all_busses(const struct dmi_system_id *d) 219 { 220 pci_probe |= PCI_ASSIGN_ALL_BUSSES; 221 printk(KERN_INFO "%s detected: enabling PCI bus# renumbering" 222 " (pci=assign-busses)\n", d->ident); 223 return 0; 224 } 225 #endif 226 227 static int __init set_scan_all(const struct dmi_system_id *d) 228 { 229 printk(KERN_INFO "PCI: %s detected, enabling pci=pcie_scan_all\n", 230 d->ident); 231 pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS); 232 return 0; 233 } 234 235 static const struct dmi_system_id pciprobe_dmi_table[] __initconst = { 236 #ifdef __i386__ 237 /* 238 * Laptops which need pci=assign-busses to see Cardbus cards 239 */ 240 { 241 .callback = assign_all_busses, 242 .ident = "Samsung X20 Laptop", 243 .matches = { 244 DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"), 245 DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"), 246 }, 247 }, 248 #endif /* __i386__ */ 249 { 250 .callback = set_bf_sort, 251 .ident = "Dell PowerEdge 1950", 252 .matches = { 253 DMI_MATCH(DMI_SYS_VENDOR, "Dell"), 254 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"), 255 }, 256 }, 257 { 258 .callback = set_bf_sort, 259 .ident = "Dell PowerEdge 1955", 260 .matches = { 261 DMI_MATCH(DMI_SYS_VENDOR, "Dell"), 262 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"), 263 }, 264 }, 265 { 266 .callback = set_bf_sort, 267 .ident = "Dell PowerEdge 2900", 268 .matches = { 269 DMI_MATCH(DMI_SYS_VENDOR, "Dell"), 270 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"), 271 }, 272 }, 273 { 274 .callback = set_bf_sort, 275 .ident = "Dell PowerEdge 2950", 276 .matches = { 277 DMI_MATCH(DMI_SYS_VENDOR, "Dell"), 278 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"), 279 }, 280 }, 281 { 282 .callback = set_bf_sort, 283 .ident = "Dell PowerEdge R900", 284 .matches = { 285 DMI_MATCH(DMI_SYS_VENDOR, "Dell"), 286 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"), 287 }, 288 }, 289 { 290 .callback = find_sort_method, 291 .ident = "Dell System", 292 .matches = { 293 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"), 294 }, 295 }, 296 { 297 .callback = set_bf_sort, 298 .ident = "HP ProLiant BL20p G3", 299 .matches = { 300 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 301 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"), 302 }, 303 }, 304 { 305 .callback = set_bf_sort, 306 .ident = "HP ProLiant BL20p G4", 307 .matches = { 308 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 309 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"), 310 }, 311 }, 312 { 313 .callback = set_bf_sort, 314 .ident = "HP ProLiant BL30p G1", 315 .matches = { 316 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 317 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"), 318 }, 319 }, 320 { 321 .callback = set_bf_sort, 322 .ident = "HP ProLiant BL25p G1", 323 .matches = { 324 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 325 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"), 326 }, 327 }, 328 { 329 .callback = set_bf_sort, 330 .ident = "HP ProLiant BL35p G1", 331 .matches = { 332 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 333 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"), 334 }, 335 }, 336 { 337 .callback = set_bf_sort, 338 .ident = "HP ProLiant BL45p G1", 339 .matches = { 340 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 341 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"), 342 }, 343 }, 344 { 345 .callback = set_bf_sort, 346 .ident = "HP ProLiant BL45p G2", 347 .matches = { 348 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 349 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"), 350 }, 351 }, 352 { 353 .callback = set_bf_sort, 354 .ident = "HP ProLiant BL460c G1", 355 .matches = { 356 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 357 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"), 358 }, 359 }, 360 { 361 .callback = set_bf_sort, 362 .ident = "HP ProLiant BL465c G1", 363 .matches = { 364 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 365 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"), 366 }, 367 }, 368 { 369 .callback = set_bf_sort, 370 .ident = "HP ProLiant BL480c G1", 371 .matches = { 372 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 373 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"), 374 }, 375 }, 376 { 377 .callback = set_bf_sort, 378 .ident = "HP ProLiant BL685c G1", 379 .matches = { 380 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 381 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"), 382 }, 383 }, 384 { 385 .callback = set_bf_sort, 386 .ident = "HP ProLiant DL360", 387 .matches = { 388 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 389 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"), 390 }, 391 }, 392 { 393 .callback = set_bf_sort, 394 .ident = "HP ProLiant DL380", 395 .matches = { 396 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 397 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"), 398 }, 399 }, 400 #ifdef __i386__ 401 { 402 .callback = assign_all_busses, 403 .ident = "Compaq EVO N800c", 404 .matches = { 405 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), 406 DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"), 407 }, 408 }, 409 #endif 410 { 411 .callback = set_bf_sort, 412 .ident = "HP ProLiant DL385 G2", 413 .matches = { 414 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 415 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"), 416 }, 417 }, 418 { 419 .callback = set_bf_sort, 420 .ident = "HP ProLiant DL585 G2", 421 .matches = { 422 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 423 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"), 424 }, 425 }, 426 { 427 .callback = set_scan_all, 428 .ident = "Stratus/NEC ftServer", 429 .matches = { 430 DMI_MATCH(DMI_SYS_VENDOR, "Stratus"), 431 DMI_MATCH(DMI_PRODUCT_NAME, "ftServer"), 432 }, 433 }, 434 { 435 .callback = set_scan_all, 436 .ident = "Stratus/NEC ftServer", 437 .matches = { 438 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 439 DMI_MATCH(DMI_PRODUCT_NAME, "Express5800/R32"), 440 }, 441 }, 442 { 443 .callback = set_scan_all, 444 .ident = "Stratus/NEC ftServer", 445 .matches = { 446 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 447 DMI_MATCH(DMI_PRODUCT_NAME, "Express5800/R31"), 448 }, 449 }, 450 {} 451 }; 452 453 void __init dmi_check_pciprobe(void) 454 { 455 dmi_check_system(pciprobe_dmi_table); 456 } 457 458 void pcibios_scan_root(int busnum) 459 { 460 struct pci_bus *bus; 461 struct pci_sysdata *sd; 462 LIST_HEAD(resources); 463 464 sd = kzalloc(sizeof(*sd), GFP_KERNEL); 465 if (!sd) { 466 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busnum); 467 return; 468 } 469 sd->node = x86_pci_root_bus_node(busnum); 470 x86_pci_root_bus_resources(busnum, &resources); 471 printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum); 472 bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, sd, &resources); 473 if (!bus) { 474 pci_free_resource_list(&resources); 475 kfree(sd); 476 return; 477 } 478 pci_bus_add_devices(bus); 479 } 480 481 void __init pcibios_set_cache_line_size(void) 482 { 483 struct cpuinfo_x86 *c = &boot_cpu_data; 484 485 /* 486 * Set PCI cacheline size to that of the CPU if the CPU has reported it. 487 * (For older CPUs that don't support cpuid, we se it to 32 bytes 488 * It's also good for 386/486s (which actually have 16) 489 * as quite a few PCI devices do not support smaller values. 490 */ 491 if (c->x86_clflush_size > 0) { 492 pci_dfl_cache_line_size = c->x86_clflush_size >> 2; 493 printk(KERN_DEBUG "PCI: pci_cache_line_size set to %d bytes\n", 494 pci_dfl_cache_line_size << 2); 495 } else { 496 pci_dfl_cache_line_size = 32 >> 2; 497 printk(KERN_DEBUG "PCI: Unknown cacheline size. Setting to 32 bytes\n"); 498 } 499 } 500 501 int __init pcibios_init(void) 502 { 503 if (!raw_pci_ops && !raw_pci_ext_ops) { 504 printk(KERN_WARNING "PCI: System does not support PCI\n"); 505 return 0; 506 } 507 508 pcibios_set_cache_line_size(); 509 pcibios_resource_survey(); 510 511 if (pci_bf_sort >= pci_force_bf) 512 pci_sort_breadthfirst(); 513 return 0; 514 } 515 516 char *__init pcibios_setup(char *str) 517 { 518 if (!strcmp(str, "off")) { 519 pci_probe = 0; 520 return NULL; 521 } else if (!strcmp(str, "bfsort")) { 522 pci_bf_sort = pci_force_bf; 523 return NULL; 524 } else if (!strcmp(str, "nobfsort")) { 525 pci_bf_sort = pci_force_nobf; 526 return NULL; 527 } 528 #ifdef CONFIG_PCI_BIOS 529 else if (!strcmp(str, "bios")) { 530 pci_probe = PCI_PROBE_BIOS; 531 return NULL; 532 } else if (!strcmp(str, "nobios")) { 533 pci_probe &= ~PCI_PROBE_BIOS; 534 return NULL; 535 } else if (!strcmp(str, "biosirq")) { 536 pci_probe |= PCI_BIOS_IRQ_SCAN; 537 return NULL; 538 } else if (!strncmp(str, "pirqaddr=", 9)) { 539 pirq_table_addr = simple_strtoul(str+9, NULL, 0); 540 return NULL; 541 } 542 #endif 543 #ifdef CONFIG_PCI_DIRECT 544 else if (!strcmp(str, "conf1")) { 545 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS; 546 return NULL; 547 } 548 else if (!strcmp(str, "conf2")) { 549 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS; 550 return NULL; 551 } 552 #endif 553 #ifdef CONFIG_PCI_MMCONFIG 554 else if (!strcmp(str, "nommconf")) { 555 pci_probe &= ~PCI_PROBE_MMCONF; 556 return NULL; 557 } 558 else if (!strcmp(str, "check_enable_amd_mmconf")) { 559 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF; 560 return NULL; 561 } 562 #endif 563 else if (!strcmp(str, "noacpi")) { 564 acpi_noirq_set(); 565 return NULL; 566 } 567 else if (!strcmp(str, "noearly")) { 568 pci_probe |= PCI_PROBE_NOEARLY; 569 return NULL; 570 } 571 else if (!strcmp(str, "usepirqmask")) { 572 pci_probe |= PCI_USE_PIRQ_MASK; 573 return NULL; 574 } else if (!strncmp(str, "irqmask=", 8)) { 575 pcibios_irq_mask = simple_strtol(str+8, NULL, 0); 576 return NULL; 577 } else if (!strncmp(str, "lastbus=", 8)) { 578 pcibios_last_bus = simple_strtol(str+8, NULL, 0); 579 return NULL; 580 } else if (!strcmp(str, "rom")) { 581 pci_probe |= PCI_ASSIGN_ROMS; 582 return NULL; 583 } else if (!strcmp(str, "norom")) { 584 pci_probe |= PCI_NOASSIGN_ROMS; 585 return NULL; 586 } else if (!strcmp(str, "nobar")) { 587 pci_probe |= PCI_NOASSIGN_BARS; 588 return NULL; 589 } else if (!strcmp(str, "assign-busses")) { 590 pci_probe |= PCI_ASSIGN_ALL_BUSSES; 591 return NULL; 592 } else if (!strcmp(str, "use_crs")) { 593 pci_probe |= PCI_USE__CRS; 594 return NULL; 595 } else if (!strcmp(str, "nocrs")) { 596 pci_probe |= PCI_ROOT_NO_CRS; 597 return NULL; 598 #ifdef CONFIG_PHYS_ADDR_T_64BIT 599 } else if (!strcmp(str, "big_root_window")) { 600 pci_probe |= PCI_BIG_ROOT_WINDOW; 601 return NULL; 602 #endif 603 } else if (!strcmp(str, "routeirq")) { 604 pci_routeirq = 1; 605 return NULL; 606 } else if (!strcmp(str, "skip_isa_align")) { 607 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN; 608 return NULL; 609 } else if (!strcmp(str, "noioapicquirk")) { 610 noioapicquirk = 1; 611 return NULL; 612 } else if (!strcmp(str, "ioapicreroute")) { 613 if (noioapicreroute != -1) 614 noioapicreroute = 0; 615 return NULL; 616 } else if (!strcmp(str, "noioapicreroute")) { 617 if (noioapicreroute != -1) 618 noioapicreroute = 1; 619 return NULL; 620 } 621 return str; 622 } 623 624 unsigned int pcibios_assign_all_busses(void) 625 { 626 return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0; 627 } 628 629 static void set_dev_domain_options(struct pci_dev *pdev) 630 { 631 if (is_vmd(pdev->bus)) 632 pdev->hotplug_user_indicators = 1; 633 } 634 635 int pcibios_add_device(struct pci_dev *dev) 636 { 637 struct pci_setup_rom *rom; 638 struct irq_domain *msidom; 639 struct setup_data *data; 640 u64 pa_data; 641 642 pa_data = boot_params.hdr.setup_data; 643 while (pa_data) { 644 data = memremap(pa_data, sizeof(*rom), MEMREMAP_WB); 645 if (!data) 646 return -ENOMEM; 647 648 if (data->type == SETUP_PCI) { 649 rom = (struct pci_setup_rom *)data; 650 651 if ((pci_domain_nr(dev->bus) == rom->segment) && 652 (dev->bus->number == rom->bus) && 653 (PCI_SLOT(dev->devfn) == rom->device) && 654 (PCI_FUNC(dev->devfn) == rom->function) && 655 (dev->vendor == rom->vendor) && 656 (dev->device == rom->devid)) { 657 dev->rom = pa_data + 658 offsetof(struct pci_setup_rom, romdata); 659 dev->romlen = rom->pcilen; 660 } 661 } 662 pa_data = data->next; 663 memunmap(data); 664 } 665 set_dev_domain_options(dev); 666 667 /* 668 * Setup the initial MSI domain of the device. If the underlying 669 * bus has a PCI/MSI irqdomain associated use the bus domain, 670 * otherwise set the default domain. This ensures that special irq 671 * domains e.g. VMD are preserved. The default ensures initial 672 * operation if irq remapping is not active. If irq remapping is 673 * active it will overwrite the domain pointer when the device is 674 * associated to a remapping domain. 675 */ 676 msidom = dev_get_msi_domain(&dev->bus->dev); 677 if (!msidom) 678 msidom = x86_pci_msi_default_domain; 679 dev_set_msi_domain(&dev->dev, msidom); 680 return 0; 681 } 682 683 int pcibios_enable_device(struct pci_dev *dev, int mask) 684 { 685 int err; 686 687 if ((err = pci_enable_resources(dev, mask)) < 0) 688 return err; 689 690 if (!pci_dev_msi_enabled(dev)) 691 return pcibios_enable_irq(dev); 692 return 0; 693 } 694 695 void pcibios_disable_device (struct pci_dev *dev) 696 { 697 if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq) 698 pcibios_disable_irq(dev); 699 } 700 701 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC 702 void pcibios_release_device(struct pci_dev *dev) 703 { 704 if (atomic_dec_return(&dev->enable_cnt) >= 0) 705 pcibios_disable_device(dev); 706 707 } 708 #endif 709 710 int pci_ext_cfg_avail(void) 711 { 712 if (raw_pci_ext_ops) 713 return 1; 714 else 715 return 0; 716 } 717 718 #if IS_ENABLED(CONFIG_VMD) 719 struct pci_dev *pci_real_dma_dev(struct pci_dev *dev) 720 { 721 if (is_vmd(dev->bus)) 722 return to_pci_sysdata(dev->bus)->vmd_dev; 723 724 return dev; 725 } 726 #endif 727