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/ioport.h>
  10 #include <linux/init.h>
  11 #include <linux/dmi.h>
  12 #include <linux/slab.h>
  13
  14 #include <asm/acpi.h>
  15 #include <asm/segment.h>
  16 #include <asm/io.h>
  17 #include <asm/smp.h>
  18 #include <asm/pci_x86.h>
  19
  20 unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
  21                                 PCI_PROBE_MMCONF;
  22
  23 unsigned int pci_early_dump_regs;
  24 static int pci_bf_sort;
  25 static int smbios_type_b1_flag;
  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 struct pci_bus *pci_root_bus;
  36 struct pci_raw_ops *raw_pci_ops;
  37 struct pci_raw_ops *raw_pci_ext_ops;
  38
  39 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
  40                                                 int reg, int len, u32 *val)
  41 {
  42         if (domain == 0 && reg < 256 && raw_pci_ops)
  43                 return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
  44         if (raw_pci_ext_ops)
  45                 return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
  46         return -EINVAL;
  47 }
  48
  49 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
  50                                                 int reg, int len, u32 val)
  51 {
  52         if (domain == 0 && reg < 256 && raw_pci_ops)
  53                 return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
  54         if (raw_pci_ext_ops)
  55                 return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
  56         return -EINVAL;
  57 }
  58
  59 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
  60 {
  61         return raw_pci_read(pci_domain_nr(bus), bus->number,
  62                                  devfn, where, size, value);
  63 }
  64
  65 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
  66 {
  67         return raw_pci_write(pci_domain_nr(bus), bus->number,
  68                                   devfn, where, size, value);
  69 }
  70
  71 struct pci_ops pci_root_ops = {
  72         .read = pci_read,
  73         .write = pci_write,
  74 };
  75
  76 /*
  77  * This interrupt-safe spinlock protects all accesses to PCI
  78  * configuration space.
  79  */
  80 DEFINE_RAW_SPINLOCK(pci_config_lock);
  81
  82 static int __devinit can_skip_ioresource_align(const struct dmi_system_id *d)
  83 {
  84         pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
  85         printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
  86         return 0;
  87 }
  88
  89 static const struct dmi_system_id can_skip_pciprobe_dmi_table[] __devinitconst = {
  90 /*
  91  * Systems where PCI IO resource ISA alignment can be skipped
  92  * when the ISA enable bit in the bridge control is not set
  93  */
  94         {
  95                 .callback = can_skip_ioresource_align,
  96                 .ident = "IBM System x3800",
  97                 .matches = {
  98                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
  99                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
 100                 },
 101         },
 102         {
 103                 .callback = can_skip_ioresource_align,
 104                 .ident = "IBM System x3850",
 105                 .matches = {
 106                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
 107                         DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
 108                 },
 109         },
 110         {
 111                 .callback = can_skip_ioresource_align,
 112                 .ident = "IBM System x3950",
 113                 .matches = {
 114                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
 115                         DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
 116                 },
 117         },
 118         {}
 119 };
 120
 121 void __init dmi_check_skip_isa_align(void)
 122 {
 123         dmi_check_system(can_skip_pciprobe_dmi_table);
 124 }
 125
 126 static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
 127 {
 128         struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
 129         struct resource *bar_r;
 130         int bar;
 131
 132         if (pci_probe & PCI_NOASSIGN_BARS) {
 133                 /*
 134                 * If the BIOS did not assign the BAR, zero out the
 135                 * resource so the kernel doesn't attmept to assign
 136                 * it later on in pci_assign_unassigned_resources
 137                 */
 138                 for (bar = 0; bar <= PCI_STD_RESOURCE_END; bar++) {
 139                         bar_r = &dev->resource[bar];
 140                         if (bar_r->start == 0 && bar_r->end != 0) {
 141                                 bar_r->flags = 0;
 142                                 bar_r->end = 0;
 143                         }
 144                 }
 145         }
 146
 147         if (pci_probe & PCI_NOASSIGN_ROMS) {
 148                 if (rom_r->parent)
 149                         return;
 150                 if (rom_r->start) {
 151                         /* we deal with BIOS assigned ROM later */
 152                         return;
 153                 }
 154                 rom_r->start = rom_r->end = rom_r->flags = 0;
 155         }
 156 }
 157
 158 /*
 159  *  Called after each bus is probed, but before its children
 160  *  are examined.
 161  */
 162
 163 void __devinit pcibios_fixup_bus(struct pci_bus *b)
 164 {
 165         struct pci_dev *dev;
 166
 167         /* root bus? */
 168         if (!b->parent)
 169                 x86_pci_root_bus_res_quirks(b);
 170         pci_read_bridge_bases(b);
 171         list_for_each_entry(dev, &b->devices, bus_list)
 172                 pcibios_fixup_device_resources(dev);
 173 }
 174
 175 /*
 176  * Only use DMI information to set this if nothing was passed
 177  * on the kernel command line (which was parsed earlier).
 178  */
 179
 180 static int __devinit set_bf_sort(const struct dmi_system_id *d)
 181 {
 182         if (pci_bf_sort == pci_bf_sort_default) {
 183                 pci_bf_sort = pci_dmi_bf;
 184                 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
 185         }
 186         return 0;
 187 }
 188
 189 static void __devinit read_dmi_type_b1(const struct dmi_header *dm,
 190                                        void *private_data)
 191 {
 192         u8 *d = (u8 *)dm + 4;
 193
 194         if (dm->type != 0xB1)
 195                 return;
 196         switch (((*(u32 *)d) >> 9) & 0x03) {
 197         case 0x00:
 198                 printk(KERN_INFO "dmi type 0xB1 record - unknown flag\n");
 199                 break;
 200         case 0x01: /* set pci=bfsort */
 201                 smbios_type_b1_flag = 1;
 202                 break;
 203         case 0x02: /* do not set pci=bfsort */
 204                 smbios_type_b1_flag = 2;
 205                 break;
 206         default:
 207                 break;
 208         }
 209 }
 210
 211 static int __devinit find_sort_method(const struct dmi_system_id *d)
 212 {
 213         dmi_walk(read_dmi_type_b1, NULL);
 214
 215         if (smbios_type_b1_flag == 1) {
 216                 set_bf_sort(d);
 217                 return 0;
 218         }
 219         return -1;
 220 }
 221
 222 /*
 223  * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
 224  */
 225 #ifdef __i386__
 226 static int __devinit assign_all_busses(const struct dmi_system_id *d)
 227 {
 228         pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 229         printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
 230                         " (pci=assign-busses)\n", d->ident);
 231         return 0;
 232 }
 233 #endif
 234
 235 static const struct dmi_system_id __devinitconst pciprobe_dmi_table[] = {
 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 = find_sort_method,
 251                 .ident = "Dell System",
 252                 .matches = {
 253                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
 254                 },
 255         },
 256         {
 257                 .callback = set_bf_sort,
 258                 .ident = "Dell PowerEdge 1950",
 259                 .matches = {
 260                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 261                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
 262                 },
 263         },
 264         {
 265                 .callback = set_bf_sort,
 266                 .ident = "Dell PowerEdge 1955",
 267                 .matches = {
 268                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 269                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
 270                 },
 271         },
 272         {
 273                 .callback = set_bf_sort,
 274                 .ident = "Dell PowerEdge 2900",
 275                 .matches = {
 276                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 277                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
 278                 },
 279         },
 280         {
 281                 .callback = set_bf_sort,
 282                 .ident = "Dell PowerEdge 2950",
 283                 .matches = {
 284                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 285                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
 286                 },
 287         },
 288         {
 289                 .callback = set_bf_sort,
 290                 .ident = "Dell PowerEdge R900",
 291                 .matches = {
 292                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 293                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
 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 };
 428
 429 void __init dmi_check_pciprobe(void)
 430 {
 431         dmi_check_system(pciprobe_dmi_table);
 432 }
 433
 434 struct pci_bus * __devinit pcibios_scan_root(int busnum)
 435 {
 436         struct pci_bus *bus = NULL;
 437         struct pci_sysdata *sd;
 438
 439         while ((bus = pci_find_next_bus(bus)) != NULL) {
 440                 if (bus->number == busnum) {
 441                         /* Already scanned */
 442                         return bus;
 443                 }
 444         }
 445
 446         /* Allocate per-root-bus (not per bus) arch-specific data.
 447          * TODO: leak; this memory is never freed.
 448          * It's arguable whether it's worth the trouble to care.
 449          */
 450         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 451         if (!sd) {
 452                 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
 453                 return NULL;
 454         }
 455
 456         sd->node = get_mp_bus_to_node(busnum);
 457
 458         printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
 459         bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
 460         if (!bus)
 461                 kfree(sd);
 462
 463         return bus;
 464 }
 465 void __init pcibios_set_cache_line_size(void)
 466 {
 467         struct cpuinfo_x86 *c = &boot_cpu_data;
 468
 469         /*
 470          * Set PCI cacheline size to that of the CPU if the CPU has reported it.
 471          * (For older CPUs that don't support cpuid, we se it to 32 bytes
 472          * It's also good for 386/486s (which actually have 16)
 473          * as quite a few PCI devices do not support smaller values.
 474          */
 475         if (c->x86_clflush_size > 0) {
 476                 pci_dfl_cache_line_size = c->x86_clflush_size >> 2;
 477                 printk(KERN_DEBUG "PCI: pci_cache_line_size set to %d bytes\n",
 478                         pci_dfl_cache_line_size << 2);
 479         } else {
 480                 pci_dfl_cache_line_size = 32 >> 2;
 481                 printk(KERN_DEBUG "PCI: Unknown cacheline size. Setting to 32 bytes\n");
 482         }
 483 }
 484
 485 int __init pcibios_init(void)
 486 {
 487         if (!raw_pci_ops) {
 488                 printk(KERN_WARNING "PCI: System does not support PCI\n");
 489                 return 0;
 490         }
 491
 492         pcibios_set_cache_line_size();
 493         pcibios_resource_survey();
 494
 495         if (pci_bf_sort >= pci_force_bf)
 496                 pci_sort_breadthfirst();
 497         return 0;
 498 }
 499
 500 char * __devinit  pcibios_setup(char *str)
 501 {
 502         if (!strcmp(str, "off")) {
 503                 pci_probe = 0;
 504                 return NULL;
 505         } else if (!strcmp(str, "bfsort")) {
 506                 pci_bf_sort = pci_force_bf;
 507                 return NULL;
 508         } else if (!strcmp(str, "nobfsort")) {
 509                 pci_bf_sort = pci_force_nobf;
 510                 return NULL;
 511         }
 512 #ifdef CONFIG_PCI_BIOS
 513         else if (!strcmp(str, "bios")) {
 514                 pci_probe = PCI_PROBE_BIOS;
 515                 return NULL;
 516         } else if (!strcmp(str, "nobios")) {
 517                 pci_probe &= ~PCI_PROBE_BIOS;
 518                 return NULL;
 519         } else if (!strcmp(str, "biosirq")) {
 520                 pci_probe |= PCI_BIOS_IRQ_SCAN;
 521                 return NULL;
 522         } else if (!strncmp(str, "pirqaddr=", 9)) {
 523                 pirq_table_addr = simple_strtoul(str+9, NULL, 0);
 524                 return NULL;
 525         }
 526 #endif
 527 #ifdef CONFIG_PCI_DIRECT
 528         else if (!strcmp(str, "conf1")) {
 529                 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
 530                 return NULL;
 531         }
 532         else if (!strcmp(str, "conf2")) {
 533                 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
 534                 return NULL;
 535         }
 536 #endif
 537 #ifdef CONFIG_PCI_MMCONFIG
 538         else if (!strcmp(str, "nommconf")) {
 539                 pci_probe &= ~PCI_PROBE_MMCONF;
 540                 return NULL;
 541         }
 542         else if (!strcmp(str, "check_enable_amd_mmconf")) {
 543                 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
 544                 return NULL;
 545         }
 546 #endif
 547         else if (!strcmp(str, "noacpi")) {
 548                 acpi_noirq_set();
 549                 return NULL;
 550         }
 551         else if (!strcmp(str, "noearly")) {
 552                 pci_probe |= PCI_PROBE_NOEARLY;
 553                 return NULL;
 554         }
 555 #ifndef CONFIG_X86_VISWS
 556         else if (!strcmp(str, "usepirqmask")) {
 557                 pci_probe |= PCI_USE_PIRQ_MASK;
 558                 return NULL;
 559         } else if (!strncmp(str, "irqmask=", 8)) {
 560                 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
 561                 return NULL;
 562         } else if (!strncmp(str, "lastbus=", 8)) {
 563                 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
 564                 return NULL;
 565         }
 566 #endif
 567         else if (!strcmp(str, "rom")) {
 568                 pci_probe |= PCI_ASSIGN_ROMS;
 569                 return NULL;
 570         } else if (!strcmp(str, "norom")) {
 571                 pci_probe |= PCI_NOASSIGN_ROMS;
 572                 return NULL;
 573         } else if (!strcmp(str, "nobar")) {
 574                 pci_probe |= PCI_NOASSIGN_BARS;
 575                 return NULL;
 576         } else if (!strcmp(str, "assign-busses")) {
 577                 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 578                 return NULL;
 579         } else if (!strcmp(str, "use_crs")) {
 580                 pci_probe |= PCI_USE__CRS;
 581                 return NULL;
 582         } else if (!strcmp(str, "nocrs")) {
 583                 pci_probe |= PCI_ROOT_NO_CRS;
 584                 return NULL;
 585         } else if (!strcmp(str, "earlydump")) {
 586                 pci_early_dump_regs = 1;
 587                 return NULL;
 588         } else if (!strcmp(str, "routeirq")) {
 589                 pci_routeirq = 1;
 590                 return NULL;
 591         } else if (!strcmp(str, "skip_isa_align")) {
 592                 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
 593                 return NULL;
 594         } else if (!strcmp(str, "noioapicquirk")) {
 595                 noioapicquirk = 1;
 596                 return NULL;
 597         } else if (!strcmp(str, "ioapicreroute")) {
 598                 if (noioapicreroute != -1)
 599                         noioapicreroute = 0;
 600                 return NULL;
 601         } else if (!strcmp(str, "noioapicreroute")) {
 602                 if (noioapicreroute != -1)
 603                         noioapicreroute = 1;
 604                 return NULL;
 605         }
 606         return str;
 607 }
 608
 609 unsigned int pcibios_assign_all_busses(void)
 610 {
 611         return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
 612 }
 613
 614 int pcibios_enable_device(struct pci_dev *dev, int mask)
 615 {
 616         int err;
 617
 618         if ((err = pci_enable_resources(dev, mask)) < 0)
 619                 return err;
 620
 621         if (!pci_dev_msi_enabled(dev))
 622                 return pcibios_enable_irq(dev);
 623         return 0;
 624 }
 625
 626 void pcibios_disable_device (struct pci_dev *dev)
 627 {
 628         if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
 629                 pcibios_disable_irq(dev);
 630 }
 631
 632 int pci_ext_cfg_avail(struct pci_dev *dev)
 633 {
 634         if (raw_pci_ext_ops)
 635                 return 1;
 636         else
 637                 return 0;
 638 }
 639
 640 struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
 641 {
 642         struct pci_bus *bus = NULL;
 643         struct pci_sysdata *sd;
 644
 645         /*
 646          * Allocate per-root-bus (not per bus) arch-specific data.
 647          * TODO: leak; this memory is never freed.
 648          * It's arguable whether it's worth the trouble to care.
 649          */
 650         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 651         if (!sd) {
 652                 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
 653                 return NULL;
 654         }
 655         sd->node = node;
 656         bus = pci_scan_bus(busno, ops, sd);
 657         if (!bus)
 658                 kfree(sd);
 659
 660         return bus;
 661 }
 662
 663 struct pci_bus * __devinit pci_scan_bus_with_sysdata(int busno)
 664 {
 665         return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
 666 }
 667
 668 /*
 669  * NUMA info for PCI busses
 670  *
 671  * Early arch code is responsible for filling in reasonable values here.
 672  * A node id of "-1" means "use current node".  In other words, if a bus
 673  * has a -1 node id, it's not tightly coupled to any particular chunk
 674  * of memory (as is the case on some Nehalem systems).
 675  */
 676 #ifdef CONFIG_NUMA
 677
 678 #define BUS_NR 256
 679
 680 #ifdef CONFIG_X86_64
 681
 682 static int mp_bus_to_node[BUS_NR] = {
 683         [0 ... BUS_NR - 1] = -1
 684 };
 685
 686 void set_mp_bus_to_node(int busnum, int node)
 687 {
 688         if (busnum >= 0 &&  busnum < BUS_NR)
 689                 mp_bus_to_node[busnum] = node;
 690 }
 691
 692 int get_mp_bus_to_node(int busnum)
 693 {
 694         int node = -1;
 695
 696         if (busnum < 0 || busnum > (BUS_NR - 1))
 697                 return node;
 698
 699         node = mp_bus_to_node[busnum];
 700
 701         /*
 702          * let numa_node_id to decide it later in dma_alloc_pages
 703          * if there is no ram on that node
 704          */
 705         if (node != -1 && !node_online(node))
 706                 node = -1;
 707
 708         return node;
 709 }
 710
 711 #else /* CONFIG_X86_32 */
 712
 713 static int mp_bus_to_node[BUS_NR] = {
 714         [0 ... BUS_NR - 1] = -1
 715 };
 716
 717 void set_mp_bus_to_node(int busnum, int node)
 718 {
 719         if (busnum >= 0 &&  busnum < BUS_NR)
 720         mp_bus_to_node[busnum] = (unsigned char) node;
 721 }
 722
 723 int get_mp_bus_to_node(int busnum)
 724 {
 725         int node;
 726
 727         if (busnum < 0 || busnum > (BUS_NR - 1))
 728                 return 0;
 729         node = mp_bus_to_node[busnum];
 730         return node;
 731 }
 732
 733 #endif /* CONFIG_X86_32 */
 734
 735 #endif /* CONFIG_NUMA */