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  * legacy, numa, and acpi all want to call pcibios_scan_root
  76  * from their initcalls. This flag prevents that.
  77  */
  78 int pcibios_scanned;
  79
  80 /*
  81  * This interrupt-safe spinlock protects all accesses to PCI
  82  * configuration space.
  83  */
  84 DEFINE_SPINLOCK(pci_config_lock);
  85
  86 static int __devinit can_skip_ioresource_align(const struct dmi_system_id *d)
  87 {
  88         pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
  89         printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
  90         return 0;
  91 }
  92
  93 static struct dmi_system_id can_skip_pciprobe_dmi_table[] __devinitdata = {
  94 /*
  95  * Systems where PCI IO resource ISA alignment can be skipped
  96  * when the ISA enable bit in the bridge control is not set
  97  */
  98         {
  99                 .callback = can_skip_ioresource_align,
 100                 .ident = "IBM System x3800",
 101                 .matches = {
 102                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
 103                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
 104                 },
 105         },
 106         {
 107                 .callback = can_skip_ioresource_align,
 108                 .ident = "IBM System x3850",
 109                 .matches = {
 110                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
 111                         DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
 112                 },
 113         },
 114         {
 115                 .callback = can_skip_ioresource_align,
 116                 .ident = "IBM System x3950",
 117                 .matches = {
 118                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
 119                         DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
 120                 },
 121         },
 122         {}
 123 };
 124
 125 void __init dmi_check_skip_isa_align(void)
 126 {
 127         dmi_check_system(can_skip_pciprobe_dmi_table);
 128 }
 129
 130 static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
 131 {
 132         struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
 133
 134         if (pci_probe & PCI_NOASSIGN_ROMS) {
 135                 if (rom_r->parent)
 136                         return;
 137                 if (rom_r->start) {
 138                         /* we deal with BIOS assigned ROM later */
 139                         return;
 140                 }
 141                 rom_r->start = rom_r->end = rom_r->flags = 0;
 142         }
 143 }
 144
 145 /*
 146  *  Called after each bus is probed, but before its children
 147  *  are examined.
 148  */
 149
 150 void __devinit  pcibios_fixup_bus(struct pci_bus *b)
 151 {
 152         struct pci_dev *dev;
 153
 154         pci_read_bridge_bases(b);
 155         list_for_each_entry(dev, &b->devices, bus_list)
 156                 pcibios_fixup_device_resources(dev);
 157 }
 158
 159 /*
 160  * Only use DMI information to set this if nothing was passed
 161  * on the kernel command line (which was parsed earlier).
 162  */
 163
 164 static int __devinit set_bf_sort(const struct dmi_system_id *d)
 165 {
 166         if (pci_bf_sort == pci_bf_sort_default) {
 167                 pci_bf_sort = pci_dmi_bf;
 168                 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
 169         }
 170         return 0;
 171 }
 172
 173 /*
 174  * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
 175  */
 176 #ifdef __i386__
 177 static int __devinit assign_all_busses(const struct dmi_system_id *d)
 178 {
 179         pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 180         printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
 181                         " (pci=assign-busses)\n", d->ident);
 182         return 0;
 183 }
 184 #endif
 185
 186 static struct dmi_system_id __devinitdata pciprobe_dmi_table[] = {
 187 #ifdef __i386__
 188 /*
 189  * Laptops which need pci=assign-busses to see Cardbus cards
 190  */
 191         {
 192                 .callback = assign_all_busses,
 193                 .ident = "Samsung X20 Laptop",
 194                 .matches = {
 195                         DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
 196                         DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
 197                 },
 198         },
 199 #endif          /* __i386__ */
 200         {
 201                 .callback = set_bf_sort,
 202                 .ident = "Dell PowerEdge 1950",
 203                 .matches = {
 204                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 205                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
 206                 },
 207         },
 208         {
 209                 .callback = set_bf_sort,
 210                 .ident = "Dell PowerEdge 1955",
 211                 .matches = {
 212                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 213                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
 214                 },
 215         },
 216         {
 217                 .callback = set_bf_sort,
 218                 .ident = "Dell PowerEdge 2900",
 219                 .matches = {
 220                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 221                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
 222                 },
 223         },
 224         {
 225                 .callback = set_bf_sort,
 226                 .ident = "Dell PowerEdge 2950",
 227                 .matches = {
 228                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 229                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
 230                 },
 231         },
 232         {
 233                 .callback = set_bf_sort,
 234                 .ident = "Dell PowerEdge R900",
 235                 .matches = {
 236                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 237                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
 238                 },
 239         },
 240         {
 241                 .callback = set_bf_sort,
 242                 .ident = "HP ProLiant BL20p G3",
 243                 .matches = {
 244                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 245                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
 246                 },
 247         },
 248         {
 249                 .callback = set_bf_sort,
 250                 .ident = "HP ProLiant BL20p G4",
 251                 .matches = {
 252                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 253                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
 254                 },
 255         },
 256         {
 257                 .callback = set_bf_sort,
 258                 .ident = "HP ProLiant BL30p G1",
 259                 .matches = {
 260                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 261                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
 262                 },
 263         },
 264         {
 265                 .callback = set_bf_sort,
 266                 .ident = "HP ProLiant BL25p G1",
 267                 .matches = {
 268                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 269                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
 270                 },
 271         },
 272         {
 273                 .callback = set_bf_sort,
 274                 .ident = "HP ProLiant BL35p G1",
 275                 .matches = {
 276                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 277                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
 278                 },
 279         },
 280         {
 281                 .callback = set_bf_sort,
 282                 .ident = "HP ProLiant BL45p G1",
 283                 .matches = {
 284                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 285                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
 286                 },
 287         },
 288         {
 289                 .callback = set_bf_sort,
 290                 .ident = "HP ProLiant BL45p G2",
 291                 .matches = {
 292                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 293                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
 294                 },
 295         },
 296         {
 297                 .callback = set_bf_sort,
 298                 .ident = "HP ProLiant BL460c G1",
 299                 .matches = {
 300                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 301                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
 302                 },
 303         },
 304         {
 305                 .callback = set_bf_sort,
 306                 .ident = "HP ProLiant BL465c G1",
 307                 .matches = {
 308                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 309                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
 310                 },
 311         },
 312         {
 313                 .callback = set_bf_sort,
 314                 .ident = "HP ProLiant BL480c G1",
 315                 .matches = {
 316                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 317                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
 318                 },
 319         },
 320         {
 321                 .callback = set_bf_sort,
 322                 .ident = "HP ProLiant BL685c G1",
 323                 .matches = {
 324                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 325                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
 326                 },
 327         },
 328         {
 329                 .callback = set_bf_sort,
 330                 .ident = "HP ProLiant DL360",
 331                 .matches = {
 332                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 333                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
 334                 },
 335         },
 336         {
 337                 .callback = set_bf_sort,
 338                 .ident = "HP ProLiant DL380",
 339                 .matches = {
 340                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 341                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
 342                 },
 343         },
 344 #ifdef __i386__
 345         {
 346                 .callback = assign_all_busses,
 347                 .ident = "Compaq EVO N800c",
 348                 .matches = {
 349                         DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
 350                         DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
 351                 },
 352         },
 353 #endif
 354         {
 355                 .callback = set_bf_sort,
 356                 .ident = "HP ProLiant DL385 G2",
 357                 .matches = {
 358                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 359                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
 360                 },
 361         },
 362         {
 363                 .callback = set_bf_sort,
 364                 .ident = "HP ProLiant DL585 G2",
 365                 .matches = {
 366                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 367                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
 368                 },
 369         },
 370         {}
 371 };
 372
 373 void __init dmi_check_pciprobe(void)
 374 {
 375         dmi_check_system(pciprobe_dmi_table);
 376 }
 377
 378 struct pci_bus * __devinit pcibios_scan_root(int busnum)
 379 {
 380         struct pci_bus *bus = NULL;
 381         struct pci_sysdata *sd;
 382
 383         while ((bus = pci_find_next_bus(bus)) != NULL) {
 384                 if (bus->number == busnum) {
 385                         /* Already scanned */
 386                         return bus;
 387                 }
 388         }
 389
 390         /* Allocate per-root-bus (not per bus) arch-specific data.
 391          * TODO: leak; this memory is never freed.
 392          * It's arguable whether it's worth the trouble to care.
 393          */
 394         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 395         if (!sd) {
 396                 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
 397                 return NULL;
 398         }
 399
 400         sd->node = get_mp_bus_to_node(busnum);
 401
 402         printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
 403         bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
 404         if (!bus)
 405                 kfree(sd);
 406
 407         return bus;
 408 }
 409
 410 extern u8 pci_cache_line_size;
 411
 412 int __init pcibios_init(void)
 413 {
 414         struct cpuinfo_x86 *c = &boot_cpu_data;
 415
 416         if (!raw_pci_ops) {
 417                 printk(KERN_WARNING "PCI: System does not support PCI\n");
 418                 return 0;
 419         }
 420
 421         /*
 422          * Assume PCI cacheline size of 32 bytes for all x86s except K7/K8
 423          * and P4. It's also good for 386/486s (which actually have 16)
 424          * as quite a few PCI devices do not support smaller values.
 425          */
 426         pci_cache_line_size = 32 >> 2;
 427         if (c->x86 >= 6 && c->x86_vendor == X86_VENDOR_AMD)
 428                 pci_cache_line_size = 64 >> 2;  /* K7 & K8 */
 429         else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
 430                 pci_cache_line_size = 128 >> 2; /* P4 */
 431
 432         pcibios_resource_survey();
 433
 434         if (pci_bf_sort >= pci_force_bf)
 435                 pci_sort_breadthfirst();
 436         return 0;
 437 }
 438
 439 char * __devinit  pcibios_setup(char *str)
 440 {
 441         if (!strcmp(str, "off")) {
 442                 pci_probe = 0;
 443                 return NULL;
 444         } else if (!strcmp(str, "bfsort")) {
 445                 pci_bf_sort = pci_force_bf;
 446                 return NULL;
 447         } else if (!strcmp(str, "nobfsort")) {
 448                 pci_bf_sort = pci_force_nobf;
 449                 return NULL;
 450         }
 451 #ifdef CONFIG_PCI_BIOS
 452         else if (!strcmp(str, "bios")) {
 453                 pci_probe = PCI_PROBE_BIOS;
 454                 return NULL;
 455         } else if (!strcmp(str, "nobios")) {
 456                 pci_probe &= ~PCI_PROBE_BIOS;
 457                 return NULL;
 458         } else if (!strcmp(str, "biosirq")) {
 459                 pci_probe |= PCI_BIOS_IRQ_SCAN;
 460                 return NULL;
 461         } else if (!strncmp(str, "pirqaddr=", 9)) {
 462                 pirq_table_addr = simple_strtoul(str+9, NULL, 0);
 463                 return NULL;
 464         }
 465 #endif
 466 #ifdef CONFIG_PCI_DIRECT
 467         else if (!strcmp(str, "conf1")) {
 468                 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
 469                 return NULL;
 470         }
 471         else if (!strcmp(str, "conf2")) {
 472                 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
 473                 return NULL;
 474         }
 475 #endif
 476 #ifdef CONFIG_PCI_MMCONFIG
 477         else if (!strcmp(str, "nommconf")) {
 478                 pci_probe &= ~PCI_PROBE_MMCONF;
 479                 return NULL;
 480         }
 481         else if (!strcmp(str, "check_enable_amd_mmconf")) {
 482                 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
 483                 return NULL;
 484         }
 485 #endif
 486         else if (!strcmp(str, "noacpi")) {
 487                 acpi_noirq_set();
 488                 return NULL;
 489         }
 490         else if (!strcmp(str, "noearly")) {
 491                 pci_probe |= PCI_PROBE_NOEARLY;
 492                 return NULL;
 493         }
 494 #ifndef CONFIG_X86_VISWS
 495         else if (!strcmp(str, "usepirqmask")) {
 496                 pci_probe |= PCI_USE_PIRQ_MASK;
 497                 return NULL;
 498         } else if (!strncmp(str, "irqmask=", 8)) {
 499                 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
 500                 return NULL;
 501         } else if (!strncmp(str, "lastbus=", 8)) {
 502                 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
 503                 return NULL;
 504         }
 505 #endif
 506         else if (!strcmp(str, "rom")) {
 507                 pci_probe |= PCI_ASSIGN_ROMS;
 508                 return NULL;
 509         } else if (!strcmp(str, "norom")) {
 510                 pci_probe |= PCI_NOASSIGN_ROMS;
 511                 return NULL;
 512         } else if (!strcmp(str, "assign-busses")) {
 513                 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 514                 return NULL;
 515         } else if (!strcmp(str, "use_crs")) {
 516                 pci_probe |= PCI_USE__CRS;
 517                 return NULL;
 518         } else if (!strcmp(str, "earlydump")) {
 519                 pci_early_dump_regs = 1;
 520                 return NULL;
 521         } else if (!strcmp(str, "routeirq")) {
 522                 pci_routeirq = 1;
 523                 return NULL;
 524         } else if (!strcmp(str, "skip_isa_align")) {
 525                 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
 526                 return NULL;
 527         } else if (!strcmp(str, "noioapicquirk")) {
 528                 noioapicquirk = 1;
 529                 return NULL;
 530         } else if (!strcmp(str, "ioapicreroute")) {
 531                 if (noioapicreroute != -1)
 532                         noioapicreroute = 0;
 533                 return NULL;
 534         } else if (!strcmp(str, "noioapicreroute")) {
 535                 if (noioapicreroute != -1)
 536                         noioapicreroute = 1;
 537                 return NULL;
 538         }
 539         return str;
 540 }
 541
 542 unsigned int pcibios_assign_all_busses(void)
 543 {
 544         return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
 545 }
 546
 547 int pcibios_enable_device(struct pci_dev *dev, int mask)
 548 {
 549         int err;
 550
 551         if ((err = pci_enable_resources(dev, mask)) < 0)
 552                 return err;
 553
 554         if (!dev->msi_enabled)
 555                 return pcibios_enable_irq(dev);
 556         return 0;
 557 }
 558
 559 void pcibios_disable_device (struct pci_dev *dev)
 560 {
 561         if (!dev->msi_enabled && pcibios_disable_irq)
 562                 pcibios_disable_irq(dev);
 563 }
 564
 565 struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
 566 {
 567         struct pci_bus *bus = NULL;
 568         struct pci_sysdata *sd;
 569
 570         /*
 571          * Allocate per-root-bus (not per bus) arch-specific data.
 572          * TODO: leak; this memory is never freed.
 573          * It's arguable whether it's worth the trouble to care.
 574          */
 575         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 576         if (!sd) {
 577                 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
 578                 return NULL;
 579         }
 580         sd->node = node;
 581         bus = pci_scan_bus(busno, ops, sd);
 582         if (!bus)
 583                 kfree(sd);
 584
 585         return bus;
 586 }
 587
 588 struct pci_bus * __devinit pci_scan_bus_with_sysdata(int busno)
 589 {
 590         return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
 591 }