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
  13 #include <asm/acpi.h>
  14 #include <asm/segment.h>
  15 #include <asm/io.h>
  16 #include <asm/smp.h>
  17 #include <asm/pci_x86.h>
  18
  19 unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
  20                                 PCI_PROBE_MMCONF;
  21
  22 unsigned int pci_early_dump_regs;
  23 static int pci_bf_sort;
  24 int pci_routeirq;
  25 int noioapicquirk;
  26 #ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
  27 int noioapicreroute = 0;
  28 #else
  29 int noioapicreroute = 1;
  30 #endif
  31 int pcibios_last_bus = -1;
  32 unsigned long pirq_table_addr;
  33 struct pci_bus *pci_root_bus;
  34 struct pci_raw_ops *raw_pci_ops;
  35 struct pci_raw_ops *raw_pci_ext_ops;
  36
  37 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
  38                                                 int reg, int len, u32 *val)
  39 {
  40         if (domain == 0 && reg < 256 && raw_pci_ops)
  41                 return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
  42         if (raw_pci_ext_ops)
  43                 return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
  44         return -EINVAL;
  45 }
  46
  47 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
  48                                                 int reg, int len, u32 val)
  49 {
  50         if (domain == 0 && reg < 256 && raw_pci_ops)
  51                 return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
  52         if (raw_pci_ext_ops)
  53                 return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
  54         return -EINVAL;
  55 }
  56
  57 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
  58 {
  59         return raw_pci_read(pci_domain_nr(bus), bus->number,
  60                                  devfn, where, size, value);
  61 }
  62
  63 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
  64 {
  65         return raw_pci_write(pci_domain_nr(bus), bus->number,
  66                                   devfn, where, size, value);
  67 }
  68
  69 struct pci_ops pci_root_ops = {
  70         .read = pci_read,
  71         .write = pci_write,
  72 };
  73
  74 /*
  75  * This interrupt-safe spinlock protects all accesses to PCI
  76  * configuration space.
  77  */
  78 DEFINE_SPINLOCK(pci_config_lock);
  79
  80 static int __devinit can_skip_ioresource_align(const struct dmi_system_id *d)
  81 {
  82         pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
  83         printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
  84         return 0;
  85 }
  86
  87 static const struct dmi_system_id can_skip_pciprobe_dmi_table[] __devinitconst = {
  88 /*
  89  * Systems where PCI IO resource ISA alignment can be skipped
  90  * when the ISA enable bit in the bridge control is not set
  91  */
  92         {
  93                 .callback = can_skip_ioresource_align,
  94                 .ident = "IBM System x3800",
  95                 .matches = {
  96                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
  97                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
  98                 },
  99         },
 100         {
 101                 .callback = can_skip_ioresource_align,
 102                 .ident = "IBM System x3850",
 103                 .matches = {
 104                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
 105                         DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
 106                 },
 107         },
 108         {
 109                 .callback = can_skip_ioresource_align,
 110                 .ident = "IBM System x3950",
 111                 .matches = {
 112                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
 113                         DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
 114                 },
 115         },
 116         {}
 117 };
 118
 119 void __init dmi_check_skip_isa_align(void)
 120 {
 121         dmi_check_system(can_skip_pciprobe_dmi_table);
 122 }
 123
 124 static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
 125 {
 126         struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
 127
 128         if (pci_probe & PCI_NOASSIGN_ROMS) {
 129                 if (rom_r->parent)
 130                         return;
 131                 if (rom_r->start) {
 132                         /* we deal with BIOS assigned ROM later */
 133                         return;
 134                 }
 135                 rom_r->start = rom_r->end = rom_r->flags = 0;
 136         }
 137 }
 138
 139 /*
 140  *  Called after each bus is probed, but before its children
 141  *  are examined.
 142  */
 143
 144 void __devinit pcibios_fixup_bus(struct pci_bus *b)
 145 {
 146         struct pci_dev *dev;
 147
 148         /* root bus? */
 149         if (!b->parent)
 150                 x86_pci_root_bus_res_quirks(b);
 151         pci_read_bridge_bases(b);
 152         list_for_each_entry(dev, &b->devices, bus_list)
 153                 pcibios_fixup_device_resources(dev);
 154 }
 155
 156 /*
 157  * Only use DMI information to set this if nothing was passed
 158  * on the kernel command line (which was parsed earlier).
 159  */
 160
 161 static int __devinit set_bf_sort(const struct dmi_system_id *d)
 162 {
 163         if (pci_bf_sort == pci_bf_sort_default) {
 164                 pci_bf_sort = pci_dmi_bf;
 165                 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
 166         }
 167         return 0;
 168 }
 169
 170 /*
 171  * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
 172  */
 173 #ifdef __i386__
 174 static int __devinit assign_all_busses(const struct dmi_system_id *d)
 175 {
 176         pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 177         printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
 178                         " (pci=assign-busses)\n", d->ident);
 179         return 0;
 180 }
 181 #endif
 182
 183 static const struct dmi_system_id __devinitconst pciprobe_dmi_table[] = {
 184 #ifdef __i386__
 185 /*
 186  * Laptops which need pci=assign-busses to see Cardbus cards
 187  */
 188         {
 189                 .callback = assign_all_busses,
 190                 .ident = "Samsung X20 Laptop",
 191                 .matches = {
 192                         DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
 193                         DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
 194                 },
 195         },
 196 #endif          /* __i386__ */
 197         {
 198                 .callback = set_bf_sort,
 199                 .ident = "Dell PowerEdge 1950",
 200                 .matches = {
 201                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 202                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
 203                 },
 204         },
 205         {
 206                 .callback = set_bf_sort,
 207                 .ident = "Dell PowerEdge 1955",
 208                 .matches = {
 209                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 210                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
 211                 },
 212         },
 213         {
 214                 .callback = set_bf_sort,
 215                 .ident = "Dell PowerEdge 2900",
 216                 .matches = {
 217                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 218                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
 219                 },
 220         },
 221         {
 222                 .callback = set_bf_sort,
 223                 .ident = "Dell PowerEdge 2950",
 224                 .matches = {
 225                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 226                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
 227                 },
 228         },
 229         {
 230                 .callback = set_bf_sort,
 231                 .ident = "Dell PowerEdge R900",
 232                 .matches = {
 233                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 234                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
 235                 },
 236         },
 237         {
 238                 .callback = set_bf_sort,
 239                 .ident = "HP ProLiant BL20p G3",
 240                 .matches = {
 241                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 242                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
 243                 },
 244         },
 245         {
 246                 .callback = set_bf_sort,
 247                 .ident = "HP ProLiant BL20p G4",
 248                 .matches = {
 249                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 250                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
 251                 },
 252         },
 253         {
 254                 .callback = set_bf_sort,
 255                 .ident = "HP ProLiant BL30p G1",
 256                 .matches = {
 257                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 258                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
 259                 },
 260         },
 261         {
 262                 .callback = set_bf_sort,
 263                 .ident = "HP ProLiant BL25p G1",
 264                 .matches = {
 265                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 266                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
 267                 },
 268         },
 269         {
 270                 .callback = set_bf_sort,
 271                 .ident = "HP ProLiant BL35p G1",
 272                 .matches = {
 273                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 274                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
 275                 },
 276         },
 277         {
 278                 .callback = set_bf_sort,
 279                 .ident = "HP ProLiant BL45p G1",
 280                 .matches = {
 281                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 282                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
 283                 },
 284         },
 285         {
 286                 .callback = set_bf_sort,
 287                 .ident = "HP ProLiant BL45p G2",
 288                 .matches = {
 289                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 290                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
 291                 },
 292         },
 293         {
 294                 .callback = set_bf_sort,
 295                 .ident = "HP ProLiant BL460c G1",
 296                 .matches = {
 297                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 298                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
 299                 },
 300         },
 301         {
 302                 .callback = set_bf_sort,
 303                 .ident = "HP ProLiant BL465c G1",
 304                 .matches = {
 305                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 306                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
 307                 },
 308         },
 309         {
 310                 .callback = set_bf_sort,
 311                 .ident = "HP ProLiant BL480c G1",
 312                 .matches = {
 313                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 314                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
 315                 },
 316         },
 317         {
 318                 .callback = set_bf_sort,
 319                 .ident = "HP ProLiant BL685c G1",
 320                 .matches = {
 321                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 322                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
 323                 },
 324         },
 325         {
 326                 .callback = set_bf_sort,
 327                 .ident = "HP ProLiant DL360",
 328                 .matches = {
 329                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 330                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
 331                 },
 332         },
 333         {
 334                 .callback = set_bf_sort,
 335                 .ident = "HP ProLiant DL380",
 336                 .matches = {
 337                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 338                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
 339                 },
 340         },
 341 #ifdef __i386__
 342         {
 343                 .callback = assign_all_busses,
 344                 .ident = "Compaq EVO N800c",
 345                 .matches = {
 346                         DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
 347                         DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
 348                 },
 349         },
 350 #endif
 351         {
 352                 .callback = set_bf_sort,
 353                 .ident = "HP ProLiant DL385 G2",
 354                 .matches = {
 355                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 356                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
 357                 },
 358         },
 359         {
 360                 .callback = set_bf_sort,
 361                 .ident = "HP ProLiant DL585 G2",
 362                 .matches = {
 363                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 364                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
 365                 },
 366         },
 367         {}
 368 };
 369
 370 void __init dmi_check_pciprobe(void)
 371 {
 372         dmi_check_system(pciprobe_dmi_table);
 373 }
 374
 375 struct pci_bus * __devinit pcibios_scan_root(int busnum)
 376 {
 377         struct pci_bus *bus = NULL;
 378         struct pci_sysdata *sd;
 379
 380         while ((bus = pci_find_next_bus(bus)) != NULL) {
 381                 if (bus->number == busnum) {
 382                         /* Already scanned */
 383                         return bus;
 384                 }
 385         }
 386
 387         /* Allocate per-root-bus (not per bus) arch-specific data.
 388          * TODO: leak; this memory is never freed.
 389          * It's arguable whether it's worth the trouble to care.
 390          */
 391         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 392         if (!sd) {
 393                 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
 394                 return NULL;
 395         }
 396
 397         sd->node = get_mp_bus_to_node(busnum);
 398
 399         printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
 400         bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
 401         if (!bus)
 402                 kfree(sd);
 403
 404         return bus;
 405 }
 406
 407 int __init pcibios_init(void)
 408 {
 409         struct cpuinfo_x86 *c = &boot_cpu_data;
 410
 411         if (!raw_pci_ops) {
 412                 printk(KERN_WARNING "PCI: System does not support PCI\n");
 413                 return 0;
 414         }
 415
 416         /*
 417          * Set PCI cacheline size to that of the CPU if the CPU has reported it.
 418          * (For older CPUs that don't support cpuid, we se it to 32 bytes
 419          * It's also good for 386/486s (which actually have 16)
 420          * as quite a few PCI devices do not support smaller values.
 421          */
 422         if (c->x86_clflush_size > 0) {
 423                 pci_dfl_cache_line_size = c->x86_clflush_size >> 2;
 424                 printk(KERN_DEBUG "PCI: pci_cache_line_size set to %d bytes\n",
 425                         pci_dfl_cache_line_size << 2);
 426         } else {
 427                 pci_dfl_cache_line_size = 32 >> 2;
 428                 printk(KERN_DEBUG "PCI: Unknown cacheline size. Setting to 32 bytes\n");
 429         }
 430
 431         pcibios_resource_survey();
 432
 433         if (pci_bf_sort >= pci_force_bf)
 434                 pci_sort_breadthfirst();
 435         return 0;
 436 }
 437
 438 char * __devinit  pcibios_setup(char *str)
 439 {
 440         if (!strcmp(str, "off")) {
 441                 pci_probe = 0;
 442                 return NULL;
 443         } else if (!strcmp(str, "bfsort")) {
 444                 pci_bf_sort = pci_force_bf;
 445                 return NULL;
 446         } else if (!strcmp(str, "nobfsort")) {
 447                 pci_bf_sort = pci_force_nobf;
 448                 return NULL;
 449         }
 450 #ifdef CONFIG_PCI_BIOS
 451         else if (!strcmp(str, "bios")) {
 452                 pci_probe = PCI_PROBE_BIOS;
 453                 return NULL;
 454         } else if (!strcmp(str, "nobios")) {
 455                 pci_probe &= ~PCI_PROBE_BIOS;
 456                 return NULL;
 457         } else if (!strcmp(str, "biosirq")) {
 458                 pci_probe |= PCI_BIOS_IRQ_SCAN;
 459                 return NULL;
 460         } else if (!strncmp(str, "pirqaddr=", 9)) {
 461                 pirq_table_addr = simple_strtoul(str+9, NULL, 0);
 462                 return NULL;
 463         }
 464 #endif
 465 #ifdef CONFIG_PCI_DIRECT
 466         else if (!strcmp(str, "conf1")) {
 467                 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
 468                 return NULL;
 469         }
 470         else if (!strcmp(str, "conf2")) {
 471                 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
 472                 return NULL;
 473         }
 474 #endif
 475 #ifdef CONFIG_PCI_MMCONFIG
 476         else if (!strcmp(str, "nommconf")) {
 477                 pci_probe &= ~PCI_PROBE_MMCONF;
 478                 return NULL;
 479         }
 480         else if (!strcmp(str, "check_enable_amd_mmconf")) {
 481                 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
 482                 return NULL;
 483         }
 484 #endif
 485         else if (!strcmp(str, "noacpi")) {
 486                 acpi_noirq_set();
 487                 return NULL;
 488         }
 489         else if (!strcmp(str, "noearly")) {
 490                 pci_probe |= PCI_PROBE_NOEARLY;
 491                 return NULL;
 492         }
 493 #ifndef CONFIG_X86_VISWS
 494         else if (!strcmp(str, "usepirqmask")) {
 495                 pci_probe |= PCI_USE_PIRQ_MASK;
 496                 return NULL;
 497         } else if (!strncmp(str, "irqmask=", 8)) {
 498                 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
 499                 return NULL;
 500         } else if (!strncmp(str, "lastbus=", 8)) {
 501                 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
 502                 return NULL;
 503         }
 504 #endif
 505         else if (!strcmp(str, "rom")) {
 506                 pci_probe |= PCI_ASSIGN_ROMS;
 507                 return NULL;
 508         } else if (!strcmp(str, "norom")) {
 509                 pci_probe |= PCI_NOASSIGN_ROMS;
 510                 return NULL;
 511         } else if (!strcmp(str, "assign-busses")) {
 512                 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 513                 return NULL;
 514         } else if (!strcmp(str, "use_crs")) {
 515                 pci_probe |= PCI_USE__CRS;
 516                 return NULL;
 517         } else if (!strcmp(str, "nocrs")) {
 518                 pci_probe |= PCI_ROOT_NO_CRS;
 519                 return NULL;
 520         } else if (!strcmp(str, "earlydump")) {
 521                 pci_early_dump_regs = 1;
 522                 return NULL;
 523         } else if (!strcmp(str, "routeirq")) {
 524                 pci_routeirq = 1;
 525                 return NULL;
 526         } else if (!strcmp(str, "skip_isa_align")) {
 527                 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
 528                 return NULL;
 529         } else if (!strcmp(str, "noioapicquirk")) {
 530                 noioapicquirk = 1;
 531                 return NULL;
 532         } else if (!strcmp(str, "ioapicreroute")) {
 533                 if (noioapicreroute != -1)
 534                         noioapicreroute = 0;
 535                 return NULL;
 536         } else if (!strcmp(str, "noioapicreroute")) {
 537                 if (noioapicreroute != -1)
 538                         noioapicreroute = 1;
 539                 return NULL;
 540         }
 541         return str;
 542 }
 543
 544 unsigned int pcibios_assign_all_busses(void)
 545 {
 546         return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
 547 }
 548
 549 int pcibios_enable_device(struct pci_dev *dev, int mask)
 550 {
 551         int err;
 552
 553         if ((err = pci_enable_resources(dev, mask)) < 0)
 554                 return err;
 555
 556         if (!pci_dev_msi_enabled(dev))
 557                 return pcibios_enable_irq(dev);
 558         return 0;
 559 }
 560
 561 void pcibios_disable_device (struct pci_dev *dev)
 562 {
 563         if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
 564                 pcibios_disable_irq(dev);
 565 }
 566
 567 int pci_ext_cfg_avail(struct pci_dev *dev)
 568 {
 569         if (raw_pci_ext_ops)
 570                 return 1;
 571         else
 572                 return 0;
 573 }
 574
 575 struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
 576 {
 577         struct pci_bus *bus = NULL;
 578         struct pci_sysdata *sd;
 579
 580         /*
 581          * Allocate per-root-bus (not per bus) arch-specific data.
 582          * TODO: leak; this memory is never freed.
 583          * It's arguable whether it's worth the trouble to care.
 584          */
 585         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 586         if (!sd) {
 587                 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
 588                 return NULL;
 589         }
 590         sd->node = node;
 591         bus = pci_scan_bus(busno, ops, sd);
 592         if (!bus)
 593                 kfree(sd);
 594
 595         return bus;
 596 }
 597
 598 struct pci_bus * __devinit pci_scan_bus_with_sysdata(int busno)
 599 {
 600         return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
 601 }
 602
 603 /*
 604  * NUMA info for PCI busses
 605  *
 606  * Early arch code is responsible for filling in reasonable values here.
 607  * A node id of "-1" means "use current node".  In other words, if a bus
 608  * has a -1 node id, it's not tightly coupled to any particular chunk
 609  * of memory (as is the case on some Nehalem systems).
 610  */
 611 #ifdef CONFIG_NUMA
 612
 613 #define BUS_NR 256
 614
 615 #ifdef CONFIG_X86_64
 616
 617 static int mp_bus_to_node[BUS_NR] = {
 618         [0 ... BUS_NR - 1] = -1
 619 };
 620
 621 void set_mp_bus_to_node(int busnum, int node)
 622 {
 623         if (busnum >= 0 &&  busnum < BUS_NR)
 624                 mp_bus_to_node[busnum] = node;
 625 }
 626
 627 int get_mp_bus_to_node(int busnum)
 628 {
 629         int node = -1;
 630
 631         if (busnum < 0 || busnum > (BUS_NR - 1))
 632                 return node;
 633
 634         node = mp_bus_to_node[busnum];
 635
 636         /*
 637          * let numa_node_id to decide it later in dma_alloc_pages
 638          * if there is no ram on that node
 639          */
 640         if (node != -1 && !node_online(node))
 641                 node = -1;
 642
 643         return node;
 644 }
 645
 646 #else /* CONFIG_X86_32 */
 647
 648 static int mp_bus_to_node[BUS_NR] = {
 649         [0 ... BUS_NR - 1] = -1
 650 };
 651
 652 void set_mp_bus_to_node(int busnum, int node)
 653 {
 654         if (busnum >= 0 &&  busnum < BUS_NR)
 655         mp_bus_to_node[busnum] = (unsigned char) node;
 656 }
 657
 658 int get_mp_bus_to_node(int busnum)
 659 {
 660         int node;
 661
 662         if (busnum < 0 || busnum > (BUS_NR - 1))
 663                 return 0;
 664         node = mp_bus_to_node[busnum];
 665         return node;
 666 }
 667
 668 #endif /* CONFIG_X86_32 */
 669
 670 #endif /* CONFIG_NUMA */