arch/x86/pci/common.c

   1 /*
   2  *      Low-Level PCI Support for PC
   3  *
   4  *      (c) 1999--2000 Martin Mares <mj@ucw.cz>
   5  */
   6
   7 #include <linux/sched.h>
   8 #include <linux/pci.h>
   9 #include <linux/pci-acpi.h>
  10 #include <linux/ioport.h>
  11 #include <linux/init.h>
  12 #include <linux/dmi.h>
  13 #include <linux/slab.h>
  14
  15 #include <asm/acpi.h>
  16 #include <asm/segment.h>
  17 #include <asm/io.h>
  18 #include <asm/smp.h>
  19 #include <asm/pci_x86.h>
  20 #include <asm/setup.h>
  21
  22 unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
  23                                 PCI_PROBE_MMCONF;
  24
  25 static int pci_bf_sort;
  26 int pci_routeirq;
  27 int noioapicquirk;
  28 #ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
  29 int noioapicreroute = 0;
  30 #else
  31 int noioapicreroute = 1;
  32 #endif
  33 int pcibios_last_bus = -1;
  34 unsigned long pirq_table_addr;
  35 const struct pci_raw_ops *__read_mostly raw_pci_ops;
  36 const struct pci_raw_ops *__read_mostly raw_pci_ext_ops;
  37
  38 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
  39                                                 int reg, int len, u32 *val)
  40 {
  41         if (domain == 0 && reg < 256 && raw_pci_ops)
  42                 return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
  43         if (raw_pci_ext_ops)
  44                 return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
  45         return -EINVAL;
  46 }
  47
  48 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
  49                                                 int reg, int len, u32 val)
  50 {
  51         if (domain == 0 && reg < 256 && raw_pci_ops)
  52                 return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
  53         if (raw_pci_ext_ops)
  54                 return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
  55         return -EINVAL;
  56 }
  57
  58 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
  59 {
  60         return raw_pci_read(pci_domain_nr(bus), bus->number,
  61                                  devfn, where, size, value);
  62 }
  63
  64 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
  65 {
  66         return raw_pci_write(pci_domain_nr(bus), bus->number,
  67                                   devfn, where, size, value);
  68 }
  69
  70 struct pci_ops pci_root_ops = {
  71         .read = pci_read,
  72         .write = pci_write,
  73 };
  74
  75 /*
  76  * This interrupt-safe spinlock protects all accesses to PCI configuration
  77  * space, except for the mmconfig (ECAM) based operations.
  78  */
  79 DEFINE_RAW_SPINLOCK(pci_config_lock);
  80
  81 static int __init can_skip_ioresource_align(const struct dmi_system_id *d)
  82 {
  83         pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
  84         printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
  85         return 0;
  86 }
  87
  88 static const struct dmi_system_id can_skip_pciprobe_dmi_table[] __initconst = {
  89 /*
  90  * Systems where PCI IO resource ISA alignment can be skipped
  91  * when the ISA enable bit in the bridge control is not set
  92  */
  93         {
  94                 .callback = can_skip_ioresource_align,
  95                 .ident = "IBM System x3800",
  96                 .matches = {
  97                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
  98                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
  99                 },
 100         },
 101         {
 102                 .callback = can_skip_ioresource_align,
 103                 .ident = "IBM System x3850",
 104                 .matches = {
 105                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
 106                         DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
 107                 },
 108         },
 109         {
 110                 .callback = can_skip_ioresource_align,
 111                 .ident = "IBM System x3950",
 112                 .matches = {
 113                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
 114                         DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
 115                 },
 116         },
 117         {}
 118 };
 119
 120 void __init dmi_check_skip_isa_align(void)
 121 {
 122         dmi_check_system(can_skip_pciprobe_dmi_table);
 123 }
 124
 125 static void pcibios_fixup_device_resources(struct pci_dev *dev)
 126 {
 127         struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
 128         struct resource *bar_r;
 129         int bar;
 130
 131         if (pci_probe & PCI_NOASSIGN_BARS) {
 132                 /*
 133                 * If the BIOS did not assign the BAR, zero out the
 134                 * resource so the kernel doesn't attempt to assign
 135                 * it later on in pci_assign_unassigned_resources
 136                 */
 137                 for (bar = 0; bar <= PCI_STD_RESOURCE_END; bar++) {
 138                         bar_r = &dev->resource[bar];
 139                         if (bar_r->start == 0 && bar_r->end != 0) {
 140                                 bar_r->flags = 0;
 141                                 bar_r->end = 0;
 142                         }
 143                 }
 144         }
 145
 146         if (pci_probe & PCI_NOASSIGN_ROMS) {
 147                 if (rom_r->parent)
 148                         return;
 149                 if (rom_r->start) {
 150                         /* we deal with BIOS assigned ROM later */
 151                         return;
 152                 }
 153                 rom_r->start = rom_r->end = rom_r->flags = 0;
 154         }
 155 }
 156
 157 /*
 158  *  Called after each bus is probed, but before its children
 159  *  are examined.
 160  */
 161
 162 void pcibios_fixup_bus(struct pci_bus *b)
 163 {
 164         struct pci_dev *dev;
 165
 166         pci_read_bridge_bases(b);
 167         list_for_each_entry(dev, &b->devices, bus_list)
 168                 pcibios_fixup_device_resources(dev);
 169 }
 170
 171 void pcibios_add_bus(struct pci_bus *bus)
 172 {
 173         acpi_pci_add_bus(bus);
 174 }
 175
 176 void pcibios_remove_bus(struct pci_bus *bus)
 177 {
 178         acpi_pci_remove_bus(bus);
 179 }
 180
 181 /*
 182  * Only use DMI information to set this if nothing was passed
 183  * on the kernel command line (which was parsed earlier).
 184  */
 185
 186 static int __init set_bf_sort(const struct dmi_system_id *d)
 187 {
 188         if (pci_bf_sort == pci_bf_sort_default) {
 189                 pci_bf_sort = pci_dmi_bf;
 190                 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
 191         }
 192         return 0;
 193 }
 194
 195 static void __init read_dmi_type_b1(const struct dmi_header *dm,
 196                                     void *private_data)
 197 {
 198         u8 *data = (u8 *)dm + 4;
 199
 200         if (dm->type != 0xB1)
 201                 return;
 202         if ((((*(u32 *)data) >> 9) & 0x03) == 0x01)
 203                 set_bf_sort((const struct dmi_system_id *)private_data);
 204 }
 205
 206 static int __init find_sort_method(const struct dmi_system_id *d)
 207 {
 208         dmi_walk(read_dmi_type_b1, (void *)d);
 209         return 0;
 210 }
 211
 212 /*
 213  * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
 214  */
 215 #ifdef __i386__
 216 static int __init assign_all_busses(const struct dmi_system_id *d)
 217 {
 218         pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 219         printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
 220                         " (pci=assign-busses)\n", d->ident);
 221         return 0;
 222 }
 223 #endif
 224
 225 static int __init set_scan_all(const struct dmi_system_id *d)
 226 {
 227         printk(KERN_INFO "PCI: %s detected, enabling pci=pcie_scan_all\n",
 228                d->ident);
 229         pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS);
 230         return 0;
 231 }
 232
 233 static const struct dmi_system_id pciprobe_dmi_table[] __initconst = {
 234 #ifdef __i386__
 235 /*
 236  * Laptops which need pci=assign-busses to see Cardbus cards
 237  */
 238         {
 239                 .callback = assign_all_busses,
 240                 .ident = "Samsung X20 Laptop",
 241                 .matches = {
 242                         DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
 243                         DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
 244                 },
 245         },
 246 #endif          /* __i386__ */
 247         {
 248                 .callback = set_bf_sort,
 249                 .ident = "Dell PowerEdge 1950",
 250                 .matches = {
 251                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 252                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
 253                 },
 254         },
 255         {
 256                 .callback = set_bf_sort,
 257                 .ident = "Dell PowerEdge 1955",
 258                 .matches = {
 259                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 260                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
 261                 },
 262         },
 263         {
 264                 .callback = set_bf_sort,
 265                 .ident = "Dell PowerEdge 2900",
 266                 .matches = {
 267                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 268                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
 269                 },
 270         },
 271         {
 272                 .callback = set_bf_sort,
 273                 .ident = "Dell PowerEdge 2950",
 274                 .matches = {
 275                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 276                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
 277                 },
 278         },
 279         {
 280                 .callback = set_bf_sort,
 281                 .ident = "Dell PowerEdge R900",
 282                 .matches = {
 283                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 284                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
 285                 },
 286         },
 287         {
 288                 .callback = find_sort_method,
 289                 .ident = "Dell System",
 290                 .matches = {
 291                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
 292                 },
 293         },
 294         {
 295                 .callback = set_bf_sort,
 296                 .ident = "HP ProLiant BL20p G3",
 297                 .matches = {
 298                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 299                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
 300                 },
 301         },
 302         {
 303                 .callback = set_bf_sort,
 304                 .ident = "HP ProLiant BL20p G4",
 305                 .matches = {
 306                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 307                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
 308                 },
 309         },
 310         {
 311                 .callback = set_bf_sort,
 312                 .ident = "HP ProLiant BL30p G1",
 313                 .matches = {
 314                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 315                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
 316                 },
 317         },
 318         {
 319                 .callback = set_bf_sort,
 320                 .ident = "HP ProLiant BL25p G1",
 321                 .matches = {
 322                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 323                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
 324                 },
 325         },
 326         {
 327                 .callback = set_bf_sort,
 328                 .ident = "HP ProLiant BL35p G1",
 329                 .matches = {
 330                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 331                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
 332                 },
 333         },
 334         {
 335                 .callback = set_bf_sort,
 336                 .ident = "HP ProLiant BL45p G1",
 337                 .matches = {
 338                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 339                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
 340                 },
 341         },
 342         {
 343                 .callback = set_bf_sort,
 344                 .ident = "HP ProLiant BL45p G2",
 345                 .matches = {
 346                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 347                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
 348                 },
 349         },
 350         {
 351                 .callback = set_bf_sort,
 352                 .ident = "HP ProLiant BL460c G1",
 353                 .matches = {
 354                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 355                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
 356                 },
 357         },
 358         {
 359                 .callback = set_bf_sort,
 360                 .ident = "HP ProLiant BL465c G1",
 361                 .matches = {
 362                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 363                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
 364                 },
 365         },
 366         {
 367                 .callback = set_bf_sort,
 368                 .ident = "HP ProLiant BL480c G1",
 369                 .matches = {
 370                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 371                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
 372                 },
 373         },
 374         {
 375                 .callback = set_bf_sort,
 376                 .ident = "HP ProLiant BL685c G1",
 377                 .matches = {
 378                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 379                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
 380                 },
 381         },
 382         {
 383                 .callback = set_bf_sort,
 384                 .ident = "HP ProLiant DL360",
 385                 .matches = {
 386                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 387                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
 388                 },
 389         },
 390         {
 391                 .callback = set_bf_sort,
 392                 .ident = "HP ProLiant DL380",
 393                 .matches = {
 394                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 395                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
 396                 },
 397         },
 398 #ifdef __i386__
 399         {
 400                 .callback = assign_all_busses,
 401                 .ident = "Compaq EVO N800c",
 402                 .matches = {
 403                         DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
 404                         DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
 405                 },
 406         },
 407 #endif
 408         {
 409                 .callback = set_bf_sort,
 410                 .ident = "HP ProLiant DL385 G2",
 411                 .matches = {
 412                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 413                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
 414                 },
 415         },
 416         {
 417                 .callback = set_bf_sort,
 418                 .ident = "HP ProLiant DL585 G2",
 419                 .matches = {
 420                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 421                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
 422                 },
 423         },
 424         {
 425                 .callback = set_scan_all,
 426                 .ident = "Stratus/NEC ftServer",
 427                 .matches = {
 428                         DMI_MATCH(DMI_SYS_VENDOR, "Stratus"),
 429                         DMI_MATCH(DMI_PRODUCT_NAME, "ftServer"),
 430                 },
 431         },
 432         {
 433                 .callback = set_scan_all,
 434                 .ident = "Stratus/NEC ftServer",
 435                 .matches = {
 436                         DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
 437                         DMI_MATCH(DMI_PRODUCT_NAME, "Express5800/R32"),
 438                 },
 439         },
 440         {
 441                 .callback = set_scan_all,
 442                 .ident = "Stratus/NEC ftServer",
 443                 .matches = {
 444                         DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
 445                         DMI_MATCH(DMI_PRODUCT_NAME, "Express5800/R31"),
 446                 },
 447         },
 448         {}
 449 };
 450
 451 void __init dmi_check_pciprobe(void)
 452 {
 453         dmi_check_system(pciprobe_dmi_table);
 454 }
 455
 456 void pcibios_scan_root(int busnum)
 457 {
 458         struct pci_bus *bus;
 459         struct pci_sysdata *sd;
 460         LIST_HEAD(resources);
 461
 462         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 463         if (!sd) {
 464                 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busnum);
 465                 return;
 466         }
 467         sd->node = x86_pci_root_bus_node(busnum);
 468         x86_pci_root_bus_resources(busnum, &resources);
 469         printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
 470         bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, sd, &resources);
 471         if (!bus) {
 472                 pci_free_resource_list(&resources);
 473                 kfree(sd);
 474                 return;
 475         }
 476         pci_bus_add_devices(bus);
 477 }
 478
 479 void __init pcibios_set_cache_line_size(void)
 480 {
 481         struct cpuinfo_x86 *c = &boot_cpu_data;
 482
 483         /*
 484          * Set PCI cacheline size to that of the CPU if the CPU has reported it.
 485          * (For older CPUs that don't support cpuid, we se it to 32 bytes
 486          * It's also good for 386/486s (which actually have 16)
 487          * as quite a few PCI devices do not support smaller values.
 488          */
 489         if (c->x86_clflush_size > 0) {
 490                 pci_dfl_cache_line_size = c->x86_clflush_size >> 2;
 491                 printk(KERN_DEBUG "PCI: pci_cache_line_size set to %d bytes\n",
 492                         pci_dfl_cache_line_size << 2);
 493         } else {
 494                 pci_dfl_cache_line_size = 32 >> 2;
 495                 printk(KERN_DEBUG "PCI: Unknown cacheline size. Setting to 32 bytes\n");
 496         }
 497 }
 498
 499 int __init pcibios_init(void)
 500 {
 501         if (!raw_pci_ops && !raw_pci_ext_ops) {
 502                 printk(KERN_WARNING "PCI: System does not support PCI\n");
 503                 return 0;
 504         }
 505
 506         pcibios_set_cache_line_size();
 507         pcibios_resource_survey();
 508
 509         if (pci_bf_sort >= pci_force_bf)
 510                 pci_sort_breadthfirst();
 511         return 0;
 512 }
 513
 514 char *__init pcibios_setup(char *str)
 515 {
 516         if (!strcmp(str, "off")) {
 517                 pci_probe = 0;
 518                 return NULL;
 519         } else if (!strcmp(str, "bfsort")) {
 520                 pci_bf_sort = pci_force_bf;
 521                 return NULL;
 522         } else if (!strcmp(str, "nobfsort")) {
 523                 pci_bf_sort = pci_force_nobf;
 524                 return NULL;
 525         }
 526 #ifdef CONFIG_PCI_BIOS
 527         else if (!strcmp(str, "bios")) {
 528                 pci_probe = PCI_PROBE_BIOS;
 529                 return NULL;
 530         } else if (!strcmp(str, "nobios")) {
 531                 pci_probe &= ~PCI_PROBE_BIOS;
 532                 return NULL;
 533         } else if (!strcmp(str, "biosirq")) {
 534                 pci_probe |= PCI_BIOS_IRQ_SCAN;
 535                 return NULL;
 536         } else if (!strncmp(str, "pirqaddr=", 9)) {
 537                 pirq_table_addr = simple_strtoul(str+9, NULL, 0);
 538                 return NULL;
 539         }
 540 #endif
 541 #ifdef CONFIG_PCI_DIRECT
 542         else if (!strcmp(str, "conf1")) {
 543                 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
 544                 return NULL;
 545         }
 546         else if (!strcmp(str, "conf2")) {
 547                 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
 548                 return NULL;
 549         }
 550 #endif
 551 #ifdef CONFIG_PCI_MMCONFIG
 552         else if (!strcmp(str, "nommconf")) {
 553                 pci_probe &= ~PCI_PROBE_MMCONF;
 554                 return NULL;
 555         }
 556         else if (!strcmp(str, "check_enable_amd_mmconf")) {
 557                 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
 558                 return NULL;
 559         }
 560 #endif
 561         else if (!strcmp(str, "noacpi")) {
 562                 acpi_noirq_set();
 563                 return NULL;
 564         }
 565         else if (!strcmp(str, "noearly")) {
 566                 pci_probe |= PCI_PROBE_NOEARLY;
 567                 return NULL;
 568         }
 569         else if (!strcmp(str, "usepirqmask")) {
 570                 pci_probe |= PCI_USE_PIRQ_MASK;
 571                 return NULL;
 572         } else if (!strncmp(str, "irqmask=", 8)) {
 573                 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
 574                 return NULL;
 575         } else if (!strncmp(str, "lastbus=", 8)) {
 576                 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
 577                 return NULL;
 578         } else if (!strcmp(str, "rom")) {
 579                 pci_probe |= PCI_ASSIGN_ROMS;
 580                 return NULL;
 581         } else if (!strcmp(str, "norom")) {
 582                 pci_probe |= PCI_NOASSIGN_ROMS;
 583                 return NULL;
 584         } else if (!strcmp(str, "nobar")) {
 585                 pci_probe |= PCI_NOASSIGN_BARS;
 586                 return NULL;
 587         } else if (!strcmp(str, "assign-busses")) {
 588                 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 589                 return NULL;
 590         } else if (!strcmp(str, "use_crs")) {
 591                 pci_probe |= PCI_USE__CRS;
 592                 return NULL;
 593         } else if (!strcmp(str, "nocrs")) {
 594                 pci_probe |= PCI_ROOT_NO_CRS;
 595                 return NULL;
 596 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 597         } else if (!strcmp(str, "big_root_window")) {
 598                 pci_probe |= PCI_BIG_ROOT_WINDOW;
 599                 return NULL;
 600 #endif
 601         } else if (!strcmp(str, "routeirq")) {
 602                 pci_routeirq = 1;
 603                 return NULL;
 604         } else if (!strcmp(str, "skip_isa_align")) {
 605                 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
 606                 return NULL;
 607         } else if (!strcmp(str, "noioapicquirk")) {
 608                 noioapicquirk = 1;
 609                 return NULL;
 610         } else if (!strcmp(str, "ioapicreroute")) {
 611                 if (noioapicreroute != -1)
 612                         noioapicreroute = 0;
 613                 return NULL;
 614         } else if (!strcmp(str, "noioapicreroute")) {
 615                 if (noioapicreroute != -1)
 616                         noioapicreroute = 1;
 617                 return NULL;
 618         }
 619         return str;
 620 }
 621
 622 unsigned int pcibios_assign_all_busses(void)
 623 {
 624         return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
 625 }
 626
 627 #if defined(CONFIG_X86_DEV_DMA_OPS) && defined(CONFIG_PCI_DOMAINS)
 628 static LIST_HEAD(dma_domain_list);
 629 static DEFINE_SPINLOCK(dma_domain_list_lock);
 630
 631 void add_dma_domain(struct dma_domain *domain)
 632 {
 633         spin_lock(&dma_domain_list_lock);
 634         list_add(&domain->node, &dma_domain_list);
 635         spin_unlock(&dma_domain_list_lock);
 636 }
 637 EXPORT_SYMBOL_GPL(add_dma_domain);
 638
 639 void del_dma_domain(struct dma_domain *domain)
 640 {
 641         spin_lock(&dma_domain_list_lock);
 642         list_del(&domain->node);
 643         spin_unlock(&dma_domain_list_lock);
 644 }
 645 EXPORT_SYMBOL_GPL(del_dma_domain);
 646
 647 static void set_dma_domain_ops(struct pci_dev *pdev)
 648 {
 649         struct dma_domain *domain;
 650
 651         spin_lock(&dma_domain_list_lock);
 652         list_for_each_entry(domain, &dma_domain_list, node) {
 653                 if (pci_domain_nr(pdev->bus) == domain->domain_nr) {
 654                         pdev->dev.dma_ops = domain->dma_ops;
 655                         break;
 656                 }
 657         }
 658         spin_unlock(&dma_domain_list_lock);
 659 }
 660 #else
 661 static void set_dma_domain_ops(struct pci_dev *pdev) {}
 662 #endif
 663
 664 static void set_dev_domain_options(struct pci_dev *pdev)
 665 {
 666         if (is_vmd(pdev->bus))
 667                 pdev->hotplug_user_indicators = 1;
 668 }
 669
 670 int pcibios_add_device(struct pci_dev *dev)
 671 {
 672         struct setup_data *data;
 673         struct pci_setup_rom *rom;
 674         u64 pa_data;
 675
 676         pa_data = boot_params.hdr.setup_data;
 677         while (pa_data) {
 678                 data = memremap(pa_data, sizeof(*rom), MEMREMAP_WB);
 679                 if (!data)
 680                         return -ENOMEM;
 681
 682                 if (data->type == SETUP_PCI) {
 683                         rom = (struct pci_setup_rom *)data;
 684
 685                         if ((pci_domain_nr(dev->bus) == rom->segment) &&
 686                             (dev->bus->number == rom->bus) &&
 687                             (PCI_SLOT(dev->devfn) == rom->device) &&
 688                             (PCI_FUNC(dev->devfn) == rom->function) &&
 689                             (dev->vendor == rom->vendor) &&
 690                             (dev->device == rom->devid)) {
 691                                 dev->rom = pa_data +
 692                                       offsetof(struct pci_setup_rom, romdata);
 693                                 dev->romlen = rom->pcilen;
 694                         }
 695                 }
 696                 pa_data = data->next;
 697                 memunmap(data);
 698         }
 699         set_dma_domain_ops(dev);
 700         set_dev_domain_options(dev);
 701         return 0;
 702 }
 703
 704 int pcibios_enable_device(struct pci_dev *dev, int mask)
 705 {
 706         int err;
 707
 708         if ((err = pci_enable_resources(dev, mask)) < 0)
 709                 return err;
 710
 711         if (!pci_dev_msi_enabled(dev))
 712                 return pcibios_enable_irq(dev);
 713         return 0;
 714 }
 715
 716 void pcibios_disable_device (struct pci_dev *dev)
 717 {
 718         if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
 719                 pcibios_disable_irq(dev);
 720 }
 721
 722 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
 723 void pcibios_release_device(struct pci_dev *dev)
 724 {
 725         if (atomic_dec_return(&dev->enable_cnt) >= 0)
 726                 pcibios_disable_device(dev);
 727
 728 }
 729 #endif
 730
 731 int pci_ext_cfg_avail(void)
 732 {
 733         if (raw_pci_ext_ops)
 734                 return 1;
 735         else
 736                 return 0;
 737 }