release/src-rt-6.x.4708/linux/linux-2.6.36/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 int pci_routeirq;
  26 int noioapicquirk;
  27 #ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
  28 int noioapicreroute = 0;
  29 #else
  30 int noioapicreroute = 1;
  31 #endif
  32 int pcibios_last_bus = -1;
  33 unsigned long pirq_table_addr;
  34 struct pci_bus *pci_root_bus;
  35 struct pci_raw_ops *raw_pci_ops;
  36 struct pci_raw_ops *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
  77  * configuration space.
  78  */
  79 DEFINE_RAW_SPINLOCK(pci_config_lock);
  80
  81 static int __devinit 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[] __devinitconst = {
  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 __devinit 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 attmept 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 __devinit pcibios_fixup_bus(struct pci_bus *b)
 163 {
 164         struct pci_dev *dev;
 165
 166         /* root bus? */
 167         if (!b->parent)
 168                 x86_pci_root_bus_res_quirks(b);
 169         pci_read_bridge_bases(b);
 170         list_for_each_entry(dev, &b->devices, bus_list)
 171                 pcibios_fixup_device_resources(dev);
 172 }
 173
 174 /*
 175  * Only use DMI information to set this if nothing was passed
 176  * on the kernel command line (which was parsed earlier).
 177  */
 178
 179 static int __devinit set_bf_sort(const struct dmi_system_id *d)
 180 {
 181         if (pci_bf_sort == pci_bf_sort_default) {
 182                 pci_bf_sort = pci_dmi_bf;
 183                 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
 184         }
 185         return 0;
 186 }
 187
 188 /*
 189  * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
 190  */
 191 #ifdef __i386__
 192 static int __devinit assign_all_busses(const struct dmi_system_id *d)
 193 {
 194         pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 195         printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
 196                         " (pci=assign-busses)\n", d->ident);
 197         return 0;
 198 }
 199 #endif
 200
 201 static const struct dmi_system_id __devinitconst pciprobe_dmi_table[] = {
 202 #ifdef __i386__
 203 /*
 204  * Laptops which need pci=assign-busses to see Cardbus cards
 205  */
 206         {
 207                 .callback = assign_all_busses,
 208                 .ident = "Samsung X20 Laptop",
 209                 .matches = {
 210                         DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
 211                         DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
 212                 },
 213         },
 214 #endif          /* __i386__ */
 215         {
 216                 .callback = set_bf_sort,
 217                 .ident = "Dell PowerEdge 1950",
 218                 .matches = {
 219                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 220                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
 221                 },
 222         },
 223         {
 224                 .callback = set_bf_sort,
 225                 .ident = "Dell PowerEdge 1955",
 226                 .matches = {
 227                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 228                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
 229                 },
 230         },
 231         {
 232                 .callback = set_bf_sort,
 233                 .ident = "Dell PowerEdge 2900",
 234                 .matches = {
 235                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 236                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
 237                 },
 238         },
 239         {
 240                 .callback = set_bf_sort,
 241                 .ident = "Dell PowerEdge 2950",
 242                 .matches = {
 243                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 244                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
 245                 },
 246         },
 247         {
 248                 .callback = set_bf_sort,
 249                 .ident = "Dell PowerEdge R900",
 250                 .matches = {
 251                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 252                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
 253                 },
 254         },
 255         {
 256                 .callback = set_bf_sort,
 257                 .ident = "HP ProLiant BL20p G3",
 258                 .matches = {
 259                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 260                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
 261                 },
 262         },
 263         {
 264                 .callback = set_bf_sort,
 265                 .ident = "HP ProLiant BL20p G4",
 266                 .matches = {
 267                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 268                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
 269                 },
 270         },
 271         {
 272                 .callback = set_bf_sort,
 273                 .ident = "HP ProLiant BL30p G1",
 274                 .matches = {
 275                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 276                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
 277                 },
 278         },
 279         {
 280                 .callback = set_bf_sort,
 281                 .ident = "HP ProLiant BL25p G1",
 282                 .matches = {
 283                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 284                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
 285                 },
 286         },
 287         {
 288                 .callback = set_bf_sort,
 289                 .ident = "HP ProLiant BL35p G1",
 290                 .matches = {
 291                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 292                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
 293                 },
 294         },
 295         {
 296                 .callback = set_bf_sort,
 297                 .ident = "HP ProLiant BL45p G1",
 298                 .matches = {
 299                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 300                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
 301                 },
 302         },
 303         {
 304                 .callback = set_bf_sort,
 305                 .ident = "HP ProLiant BL45p G2",
 306                 .matches = {
 307                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 308                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
 309                 },
 310         },
 311         {
 312                 .callback = set_bf_sort,
 313                 .ident = "HP ProLiant BL460c G1",
 314                 .matches = {
 315                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 316                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
 317                 },
 318         },
 319         {
 320                 .callback = set_bf_sort,
 321                 .ident = "HP ProLiant BL465c G1",
 322                 .matches = {
 323                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 324                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
 325                 },
 326         },
 327         {
 328                 .callback = set_bf_sort,
 329                 .ident = "HP ProLiant BL480c G1",
 330                 .matches = {
 331                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 332                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
 333                 },
 334         },
 335         {
 336                 .callback = set_bf_sort,
 337                 .ident = "HP ProLiant BL685c G1",
 338                 .matches = {
 339                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 340                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
 341                 },
 342         },
 343         {
 344                 .callback = set_bf_sort,
 345                 .ident = "HP ProLiant DL360",
 346                 .matches = {
 347                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 348                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
 349                 },
 350         },
 351         {
 352                 .callback = set_bf_sort,
 353                 .ident = "HP ProLiant DL380",
 354                 .matches = {
 355                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 356                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
 357                 },
 358         },
 359 #ifdef __i386__
 360         {
 361                 .callback = assign_all_busses,
 362                 .ident = "Compaq EVO N800c",
 363                 .matches = {
 364                         DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
 365                         DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
 366                 },
 367         },
 368 #endif
 369         {
 370                 .callback = set_bf_sort,
 371                 .ident = "HP ProLiant DL385 G2",
 372                 .matches = {
 373                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 374                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
 375                 },
 376         },
 377         {
 378                 .callback = set_bf_sort,
 379                 .ident = "HP ProLiant DL585 G2",
 380                 .matches = {
 381                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 382                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
 383                 },
 384         },
 385         {}
 386 };
 387
 388 void __init dmi_check_pciprobe(void)
 389 {
 390         dmi_check_system(pciprobe_dmi_table);
 391 }
 392
 393 struct pci_bus * __devinit pcibios_scan_root(int busnum)
 394 {
 395         struct pci_bus *bus = NULL;
 396         struct pci_sysdata *sd;
 397
 398         while ((bus = pci_find_next_bus(bus)) != NULL) {
 399                 if (bus->number == busnum) {
 400                         /* Already scanned */
 401                         return bus;
 402                 }
 403         }
 404
 405         /* Allocate per-root-bus (not per bus) arch-specific data.
 406          * TODO: leak; this memory is never freed.
 407          * It's arguable whether it's worth the trouble to care.
 408          */
 409         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 410         if (!sd) {
 411                 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
 412                 return NULL;
 413         }
 414
 415         sd->node = get_mp_bus_to_node(busnum);
 416
 417         printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
 418         bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
 419         if (!bus)
 420                 kfree(sd);
 421
 422         return bus;
 423 }
 424
 425 int __init pcibios_init(void)
 426 {
 427         struct cpuinfo_x86 *c = &boot_cpu_data;
 428
 429         if (!raw_pci_ops) {
 430                 printk(KERN_WARNING "PCI: System does not support PCI\n");
 431                 return 0;
 432         }
 433
 434         /*
 435          * Set PCI cacheline size to that of the CPU if the CPU has reported it.
 436          * (For older CPUs that don't support cpuid, we se it to 32 bytes
 437          * It's also good for 386/486s (which actually have 16)
 438          * as quite a few PCI devices do not support smaller values.
 439          */
 440         if (c->x86_clflush_size > 0) {
 441                 pci_dfl_cache_line_size = c->x86_clflush_size >> 2;
 442                 printk(KERN_DEBUG "PCI: pci_cache_line_size set to %d bytes\n",
 443                         pci_dfl_cache_line_size << 2);
 444         } else {
 445                 pci_dfl_cache_line_size = 32 >> 2;
 446                 printk(KERN_DEBUG "PCI: Unknown cacheline size. Setting to 32 bytes\n");
 447         }
 448
 449         pcibios_resource_survey();
 450
 451         if (pci_bf_sort >= pci_force_bf)
 452                 pci_sort_breadthfirst();
 453         return 0;
 454 }
 455
 456 char * __devinit  pcibios_setup(char *str)
 457 {
 458         if (!strcmp(str, "off")) {
 459                 pci_probe = 0;
 460                 return NULL;
 461         } else if (!strcmp(str, "bfsort")) {
 462                 pci_bf_sort = pci_force_bf;
 463                 return NULL;
 464         } else if (!strcmp(str, "nobfsort")) {
 465                 pci_bf_sort = pci_force_nobf;
 466                 return NULL;
 467         }
 468 #ifdef CONFIG_PCI_BIOS
 469         else if (!strcmp(str, "bios")) {
 470                 pci_probe = PCI_PROBE_BIOS;
 471                 return NULL;
 472         } else if (!strcmp(str, "nobios")) {
 473                 pci_probe &= ~PCI_PROBE_BIOS;
 474                 return NULL;
 475         } else if (!strcmp(str, "biosirq")) {
 476                 pci_probe |= PCI_BIOS_IRQ_SCAN;
 477                 return NULL;
 478         } else if (!strncmp(str, "pirqaddr=", 9)) {
 479                 pirq_table_addr = simple_strtoul(str+9, NULL, 0);
 480                 return NULL;
 481         }
 482 #endif
 483 #ifdef CONFIG_PCI_DIRECT
 484         else if (!strcmp(str, "conf1")) {
 485                 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
 486                 return NULL;
 487         }
 488         else if (!strcmp(str, "conf2")) {
 489                 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
 490                 return NULL;
 491         }
 492 #endif
 493 #ifdef CONFIG_PCI_MMCONFIG
 494         else if (!strcmp(str, "nommconf")) {
 495                 pci_probe &= ~PCI_PROBE_MMCONF;
 496                 return NULL;
 497         }
 498         else if (!strcmp(str, "check_enable_amd_mmconf")) {
 499                 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
 500                 return NULL;
 501         }
 502 #endif
 503         else if (!strcmp(str, "noacpi")) {
 504                 acpi_noirq_set();
 505                 return NULL;
 506         }
 507         else if (!strcmp(str, "noearly")) {
 508                 pci_probe |= PCI_PROBE_NOEARLY;
 509                 return NULL;
 510         }
 511 #ifndef CONFIG_X86_VISWS
 512         else if (!strcmp(str, "usepirqmask")) {
 513                 pci_probe |= PCI_USE_PIRQ_MASK;
 514                 return NULL;
 515         } else if (!strncmp(str, "irqmask=", 8)) {
 516                 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
 517                 return NULL;
 518         } else if (!strncmp(str, "lastbus=", 8)) {
 519                 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
 520                 return NULL;
 521         }
 522 #endif
 523         else if (!strcmp(str, "rom")) {
 524                 pci_probe |= PCI_ASSIGN_ROMS;
 525                 return NULL;
 526         } else if (!strcmp(str, "norom")) {
 527                 pci_probe |= PCI_NOASSIGN_ROMS;
 528                 return NULL;
 529         } else if (!strcmp(str, "nobar")) {
 530                 pci_probe |= PCI_NOASSIGN_BARS;
 531                 return NULL;
 532         } else if (!strcmp(str, "assign-busses")) {
 533                 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 534                 return NULL;
 535         } else if (!strcmp(str, "use_crs")) {
 536                 pci_probe |= PCI_USE__CRS;
 537                 return NULL;
 538         } else if (!strcmp(str, "nocrs")) {
 539                 pci_probe |= PCI_ROOT_NO_CRS;
 540                 return NULL;
 541         } else if (!strcmp(str, "earlydump")) {
 542                 pci_early_dump_regs = 1;
 543                 return NULL;
 544         } else if (!strcmp(str, "routeirq")) {
 545                 pci_routeirq = 1;
 546                 return NULL;
 547         } else if (!strcmp(str, "skip_isa_align")) {
 548                 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
 549                 return NULL;
 550         } else if (!strcmp(str, "noioapicquirk")) {
 551                 noioapicquirk = 1;
 552                 return NULL;
 553         } else if (!strcmp(str, "ioapicreroute")) {
 554                 if (noioapicreroute != -1)
 555                         noioapicreroute = 0;
 556                 return NULL;
 557         } else if (!strcmp(str, "noioapicreroute")) {
 558                 if (noioapicreroute != -1)
 559                         noioapicreroute = 1;
 560                 return NULL;
 561         }
 562         return str;
 563 }
 564
 565 unsigned int pcibios_assign_all_busses(void)
 566 {
 567         return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
 568 }
 569
 570 int pcibios_enable_device(struct pci_dev *dev, int mask)
 571 {
 572         int err;
 573
 574         if ((err = pci_enable_resources(dev, mask)) < 0)
 575                 return err;
 576
 577         if (!pci_dev_msi_enabled(dev))
 578                 return pcibios_enable_irq(dev);
 579         return 0;
 580 }
 581
 582 void pcibios_disable_device (struct pci_dev *dev)
 583 {
 584         if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
 585                 pcibios_disable_irq(dev);
 586 }
 587
 588 int pci_ext_cfg_avail(struct pci_dev *dev)
 589 {
 590         if (raw_pci_ext_ops)
 591                 return 1;
 592         else
 593                 return 0;
 594 }
 595
 596 struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
 597 {
 598         struct pci_bus *bus = NULL;
 599         struct pci_sysdata *sd;
 600
 601         /*
 602          * Allocate per-root-bus (not per bus) arch-specific data.
 603          * TODO: leak; this memory is never freed.
 604          * It's arguable whether it's worth the trouble to care.
 605          */
 606         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 607         if (!sd) {
 608                 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
 609                 return NULL;
 610         }
 611         sd->node = node;
 612         bus = pci_scan_bus(busno, ops, sd);
 613         if (!bus)
 614                 kfree(sd);
 615
 616         return bus;
 617 }
 618
 619 struct pci_bus * __devinit pci_scan_bus_with_sysdata(int busno)
 620 {
 621         return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
 622 }
 623
 624 /*
 625  * NUMA info for PCI busses
 626  *
 627  * Early arch code is responsible for filling in reasonable values here.
 628  * A node id of "-1" means "use current node".  In other words, if a bus
 629  * has a -1 node id, it's not tightly coupled to any particular chunk
 630  * of memory (as is the case on some Nehalem systems).
 631  */
 632 #ifdef CONFIG_NUMA
 633
 634 #define BUS_NR 256
 635
 636 #ifdef CONFIG_X86_64
 637
 638 static int mp_bus_to_node[BUS_NR] = {
 639         [0 ... BUS_NR - 1] = -1
 640 };
 641
 642 void set_mp_bus_to_node(int busnum, int node)
 643 {
 644         if (busnum >= 0 &&  busnum < BUS_NR)
 645                 mp_bus_to_node[busnum] = node;
 646 }
 647
 648 int get_mp_bus_to_node(int busnum)
 649 {
 650         int node = -1;
 651
 652         if (busnum < 0 || busnum > (BUS_NR - 1))
 653                 return node;
 654
 655         node = mp_bus_to_node[busnum];
 656
 657         /*
 658          * let numa_node_id to decide it later in dma_alloc_pages
 659          * if there is no ram on that node
 660          */
 661         if (node != -1 && !node_online(node))
 662                 node = -1;
 663
 664         return node;
 665 }
 666
 667 #else /* CONFIG_X86_32 */
 668
 669 static int mp_bus_to_node[BUS_NR] = {
 670         [0 ... BUS_NR - 1] = -1
 671 };
 672
 673 void set_mp_bus_to_node(int busnum, int node)
 674 {
 675         if (busnum >= 0 &&  busnum < BUS_NR)
 676         mp_bus_to_node[busnum] = (unsigned char) node;
 677 }
 678
 679 int get_mp_bus_to_node(int busnum)
 680 {
 681         int node;
 682
 683         if (busnum < 0 || busnum > (BUS_NR - 1))
 684                 return 0;
 685         node = mp_bus_to_node[busnum];
 686         return node;
 687 }
 688
 689 #endif /* CONFIG_X86_32 */
 690
 691 #endif /* CONFIG_NUMA */