arch/x86/pci/acpi.c

   1 #include <linux/pci.h>
   2 #include <linux/acpi.h>
   3 #include <linux/init.h>
   4 #include <linux/irq.h>
   5 #include <linux/dmi.h>
   6 #include <linux/slab.h>
   7 #include <asm/numa.h>
   8 #include <asm/pci_x86.h>
   9
  10 struct pci_root_info {
  11         struct acpi_device *bridge;
  12         char name[16];
  13         unsigned int res_num;
  14         struct resource *res;
  15         resource_size_t *res_offset;
  16         struct pci_sysdata sd;
  17 #ifdef  CONFIG_PCI_MMCONFIG
  18         bool mcfg_added;
  19         u16 segment;
  20         u8 start_bus;
  21         u8 end_bus;
  22 #endif
  23 };
  24
  25 static bool pci_use_crs = true;
  26 static bool pci_ignore_seg = false;
  27
  28 static int __init set_use_crs(const struct dmi_system_id *id)
  29 {
  30         pci_use_crs = true;
  31         return 0;
  32 }
  33
  34 static int __init set_nouse_crs(const struct dmi_system_id *id)
  35 {
  36         pci_use_crs = false;
  37         return 0;
  38 }
  39
  40 static int __init set_ignore_seg(const struct dmi_system_id *id)
  41 {
  42         printk(KERN_INFO "PCI: %s detected: ignoring ACPI _SEG\n", id->ident);
  43         pci_ignore_seg = true;
  44         return 0;
  45 }
  46
  47 static const struct dmi_system_id pci_crs_quirks[] __initconst = {
  48         /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
  49         {
  50                 .callback = set_use_crs,
  51                 .ident = "IBM System x3800",
  52                 .matches = {
  53                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
  54                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
  55                 },
  56         },
  57         /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
  58         /* 2006 AMD HT/VIA system with two host bridges */
  59         {
  60                 .callback = set_use_crs,
  61                 .ident = "ASRock ALiveSATA2-GLAN",
  62                 .matches = {
  63                         DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
  64                 },
  65         },
  66         /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
  67         /* 2006 AMD HT/VIA system with two host bridges */
  68         {
  69                 .callback = set_use_crs,
  70                 .ident = "ASUS M2V-MX SE",
  71                 .matches = {
  72                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
  73                         DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
  74                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
  75                 },
  76         },
  77         /* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
  78         {
  79                 .callback = set_use_crs,
  80                 .ident = "MSI MS-7253",
  81                 .matches = {
  82                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
  83                         DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
  84                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
  85                 },
  86         },
  87
  88         /* Now for the blacklist.. */
  89
  90         /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
  91         {
  92                 .callback = set_nouse_crs,
  93                 .ident = "Dell Studio 1557",
  94                 .matches = {
  95                         DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
  96                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
  97                         DMI_MATCH(DMI_BIOS_VERSION, "A09"),
  98                 },
  99         },
 100         /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
 101         {
 102                 .callback = set_nouse_crs,
 103                 .ident = "Thinkpad SL510",
 104                 .matches = {
 105                         DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 106                         DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
 107                         DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
 108                 },
 109         },
 110
 111         /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
 112         {
 113                 .callback = set_ignore_seg,
 114                 .ident = "HP xw9300",
 115                 .matches = {
 116                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 117                         DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
 118                 },
 119         },
 120         {}
 121 };
 122
 123 void __init pci_acpi_crs_quirks(void)
 124 {
 125         int year;
 126
 127         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
 128                 pci_use_crs = false;
 129
 130         dmi_check_system(pci_crs_quirks);
 131
 132         /*
 133          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
 134          * takes precedence over anything we figured out above.
 135          */
 136         if (pci_probe & PCI_ROOT_NO_CRS)
 137                 pci_use_crs = false;
 138         else if (pci_probe & PCI_USE__CRS)
 139                 pci_use_crs = true;
 140
 141         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
 142                "if necessary, use \"pci=%s\" and report a bug\n",
 143                pci_use_crs ? "Using" : "Ignoring",
 144                pci_use_crs ? "nocrs" : "use_crs");
 145 }
 146
 147 #ifdef  CONFIG_PCI_MMCONFIG
 148 static int check_segment(u16 seg, struct device *dev, char *estr)
 149 {
 150         if (seg) {
 151                 dev_err(dev,
 152                         "%s can't access PCI configuration "
 153                         "space under this host bridge.\n",
 154                         estr);
 155                 return -EIO;
 156         }
 157
 158         /*
 159          * Failure in adding MMCFG information is not fatal,
 160          * just can't access extended configuration space of
 161          * devices under this host bridge.
 162          */
 163         dev_warn(dev,
 164                  "%s can't access extended PCI configuration "
 165                  "space under this bridge.\n",
 166                  estr);
 167
 168         return 0;
 169 }
 170
 171 static int setup_mcfg_map(struct pci_root_info *info, u16 seg, u8 start,
 172                           u8 end, phys_addr_t addr)
 173 {
 174         int result;
 175         struct device *dev = &info->bridge->dev;
 176
 177         info->start_bus = start;
 178         info->end_bus = end;
 179         info->mcfg_added = false;
 180
 181         /* return success if MMCFG is not in use */
 182         if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
 183                 return 0;
 184
 185         if (!(pci_probe & PCI_PROBE_MMCONF))
 186                 return check_segment(seg, dev, "MMCONFIG is disabled,");
 187
 188         result = pci_mmconfig_insert(dev, seg, start, end, addr);
 189         if (result == 0) {
 190                 /* enable MMCFG if it hasn't been enabled yet */
 191                 if (raw_pci_ext_ops == NULL)
 192                         raw_pci_ext_ops = &pci_mmcfg;
 193                 info->mcfg_added = true;
 194         } else if (result != -EEXIST)
 195                 return check_segment(seg, dev,
 196                          "fail to add MMCONFIG information,");
 197
 198         return 0;
 199 }
 200
 201 static void teardown_mcfg_map(struct pci_root_info *info)
 202 {
 203         if (info->mcfg_added) {
 204                 pci_mmconfig_delete(info->segment, info->start_bus,
 205                                     info->end_bus);
 206                 info->mcfg_added = false;
 207         }
 208 }
 209 #else
 210 static int setup_mcfg_map(struct pci_root_info *info,
 211                                     u16 seg, u8 start, u8 end,
 212                                     phys_addr_t addr)
 213 {
 214         return 0;
 215 }
 216 static void teardown_mcfg_map(struct pci_root_info *info)
 217 {
 218 }
 219 #endif
 220
 221 static acpi_status resource_to_addr(struct acpi_resource *resource,
 222                                     struct acpi_resource_address64 *addr)
 223 {
 224         acpi_status status;
 225         struct acpi_resource_memory24 *memory24;
 226         struct acpi_resource_memory32 *memory32;
 227         struct acpi_resource_fixed_memory32 *fixed_memory32;
 228
 229         memset(addr, 0, sizeof(*addr));
 230         switch (resource->type) {
 231         case ACPI_RESOURCE_TYPE_MEMORY24:
 232                 memory24 = &resource->data.memory24;
 233                 addr->resource_type = ACPI_MEMORY_RANGE;
 234                 addr->address.minimum = memory24->minimum;
 235                 addr->address.address_length = memory24->address_length;
 236                 addr->address.maximum = addr->address.minimum + addr->address.address_length - 1;
 237                 return AE_OK;
 238         case ACPI_RESOURCE_TYPE_MEMORY32:
 239                 memory32 = &resource->data.memory32;
 240                 addr->resource_type = ACPI_MEMORY_RANGE;
 241                 addr->address.minimum = memory32->minimum;
 242                 addr->address.address_length = memory32->address_length;
 243                 addr->address.maximum = addr->address.minimum + addr->address.address_length - 1;
 244                 return AE_OK;
 245         case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
 246                 fixed_memory32 = &resource->data.fixed_memory32;
 247                 addr->resource_type = ACPI_MEMORY_RANGE;
 248                 addr->address.minimum = fixed_memory32->address;
 249                 addr->address.address_length = fixed_memory32->address_length;
 250                 addr->address.maximum = addr->address.minimum + addr->address.address_length - 1;
 251                 return AE_OK;
 252         case ACPI_RESOURCE_TYPE_ADDRESS16:
 253         case ACPI_RESOURCE_TYPE_ADDRESS32:
 254         case ACPI_RESOURCE_TYPE_ADDRESS64:
 255                 status = acpi_resource_to_address64(resource, addr);
 256                 if (ACPI_SUCCESS(status) &&
 257                     (addr->resource_type == ACPI_MEMORY_RANGE ||
 258                     addr->resource_type == ACPI_IO_RANGE) &&
 259                     addr->address.address_length > 0) {
 260                         return AE_OK;
 261                 }
 262                 break;
 263         }
 264         return AE_ERROR;
 265 }
 266
 267 static acpi_status count_resource(struct acpi_resource *acpi_res, void *data)
 268 {
 269         struct pci_root_info *info = data;
 270         struct acpi_resource_address64 addr;
 271         acpi_status status;
 272
 273         status = resource_to_addr(acpi_res, &addr);
 274         if (ACPI_SUCCESS(status))
 275                 info->res_num++;
 276         return AE_OK;
 277 }
 278
 279 static acpi_status setup_resource(struct acpi_resource *acpi_res, void *data)
 280 {
 281         struct pci_root_info *info = data;
 282         struct resource *res;
 283         struct acpi_resource_address64 addr;
 284         acpi_status status;
 285         unsigned long flags;
 286         u64 start, orig_end, end, res_end;
 287
 288         status = resource_to_addr(acpi_res, &addr);
 289         if (!ACPI_SUCCESS(status))
 290                 return AE_OK;
 291
 292         if (addr.resource_type == ACPI_MEMORY_RANGE) {
 293                 flags = IORESOURCE_MEM;
 294                 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
 295                         flags |= IORESOURCE_PREFETCH;
 296                 res_end = (u64)iomem_resource.end;
 297         } else if (addr.resource_type == ACPI_IO_RANGE) {
 298                 flags = IORESOURCE_IO;
 299                 res_end = (u64)ioport_resource.end;
 300         } else
 301                 return AE_OK;
 302
 303         start = addr.address.minimum + addr.address.translation_offset;
 304         orig_end = end = addr.address.maximum + addr.address.translation_offset;
 305
 306         /* Exclude non-addressable range or non-addressable portion of range */
 307         end = min(end, res_end);
 308         if (end <= start) {
 309                 dev_info(&info->bridge->dev,
 310                         "host bridge window [%#llx-%#llx] "
 311                         "(ignored, not CPU addressable)\n", start, orig_end);
 312                 return AE_OK;
 313         } else if (orig_end != end) {
 314                 dev_info(&info->bridge->dev,
 315                         "host bridge window [%#llx-%#llx] "
 316                         "([%#llx-%#llx] ignored, not CPU addressable)\n",
 317                         start, orig_end, end + 1, orig_end);
 318         }
 319
 320         res = &info->res[info->res_num];
 321         res->name = info->name;
 322         res->flags = flags;
 323         res->start = start;
 324         res->end = end;
 325         info->res_offset[info->res_num] = addr.address.translation_offset;
 326         info->res_num++;
 327
 328         if (!pci_use_crs)
 329                 dev_printk(KERN_DEBUG, &info->bridge->dev,
 330                            "host bridge window %pR (ignored)\n", res);
 331
 332         return AE_OK;
 333 }
 334
 335 static void coalesce_windows(struct pci_root_info *info, unsigned long type)
 336 {
 337         int i, j;
 338         struct resource *res1, *res2;
 339
 340         for (i = 0; i < info->res_num; i++) {
 341                 res1 = &info->res[i];
 342                 if (!(res1->flags & type))
 343                         continue;
 344
 345                 for (j = i + 1; j < info->res_num; j++) {
 346                         res2 = &info->res[j];
 347                         if (!(res2->flags & type))
 348                                 continue;
 349
 350                         /*
 351                          * I don't like throwing away windows because then
 352                          * our resources no longer match the ACPI _CRS, but
 353                          * the kernel resource tree doesn't allow overlaps.
 354                          */
 355                         if (resource_overlaps(res1, res2)) {
 356                                 res2->start = min(res1->start, res2->start);
 357                                 res2->end = max(res1->end, res2->end);
 358                                 dev_info(&info->bridge->dev,
 359                                          "host bridge window expanded to %pR; %pR ignored\n",
 360                                          res2, res1);
 361                                 res1->flags = 0;
 362                         }
 363                 }
 364         }
 365 }
 366
 367 static void add_resources(struct pci_root_info *info,
 368                           struct list_head *resources)
 369 {
 370         int i;
 371         struct resource *res, *root, *conflict;
 372
 373         coalesce_windows(info, IORESOURCE_MEM);
 374         coalesce_windows(info, IORESOURCE_IO);
 375
 376         for (i = 0; i < info->res_num; i++) {
 377                 res = &info->res[i];
 378
 379                 if (res->flags & IORESOURCE_MEM)
 380                         root = &iomem_resource;
 381                 else if (res->flags & IORESOURCE_IO)
 382                         root = &ioport_resource;
 383                 else
 384                         continue;
 385
 386                 conflict = insert_resource_conflict(root, res);
 387                 if (conflict)
 388                         dev_info(&info->bridge->dev,
 389                                  "ignoring host bridge window %pR (conflicts with %s %pR)\n",
 390                                  res, conflict->name, conflict);
 391                 else
 392                         pci_add_resource_offset(resources, res,
 393                                         info->res_offset[i]);
 394         }
 395 }
 396
 397 static void free_pci_root_info_res(struct pci_root_info *info)
 398 {
 399         kfree(info->res);
 400         info->res = NULL;
 401         kfree(info->res_offset);
 402         info->res_offset = NULL;
 403         info->res_num = 0;
 404 }
 405
 406 static void __release_pci_root_info(struct pci_root_info *info)
 407 {
 408         int i;
 409         struct resource *res;
 410
 411         for (i = 0; i < info->res_num; i++) {
 412                 res = &info->res[i];
 413
 414                 if (!res->parent)
 415                         continue;
 416
 417                 if (!(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
 418                         continue;
 419
 420                 release_resource(res);
 421         }
 422
 423         free_pci_root_info_res(info);
 424
 425         teardown_mcfg_map(info);
 426
 427         kfree(info);
 428 }
 429
 430 static void release_pci_root_info(struct pci_host_bridge *bridge)
 431 {
 432         struct pci_root_info *info = bridge->release_data;
 433
 434         __release_pci_root_info(info);
 435 }
 436
 437 static void probe_pci_root_info(struct pci_root_info *info,
 438                                 struct acpi_device *device,
 439                                 int busnum, int domain)
 440 {
 441         size_t size;
 442
 443         sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum);
 444         info->bridge = device;
 445
 446         info->res_num = 0;
 447         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
 448                                 info);
 449         if (!info->res_num)
 450                 return;
 451
 452         size = sizeof(*info->res) * info->res_num;
 453         info->res = kzalloc_node(size, GFP_KERNEL, info->sd.node);
 454         if (!info->res) {
 455                 info->res_num = 0;
 456                 return;
 457         }
 458
 459         size = sizeof(*info->res_offset) * info->res_num;
 460         info->res_num = 0;
 461         info->res_offset = kzalloc_node(size, GFP_KERNEL, info->sd.node);
 462         if (!info->res_offset) {
 463                 kfree(info->res);
 464                 info->res = NULL;
 465                 return;
 466         }
 467
 468         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
 469                                 info);
 470 }
 471
 472 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 473 {
 474         struct acpi_device *device = root->device;
 475         struct pci_root_info *info;
 476         int domain = root->segment;
 477         int busnum = root->secondary.start;
 478         LIST_HEAD(resources);
 479         struct pci_bus *bus;
 480         struct pci_sysdata *sd;
 481         int node;
 482
 483         if (pci_ignore_seg)
 484                 domain = 0;
 485
 486         if (domain && !pci_domains_supported) {
 487                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 488                        "ignored (multiple domains not supported)\n",
 489                        domain, busnum);
 490                 return NULL;
 491         }
 492
 493         node = acpi_get_node(device->handle);
 494         if (node == NUMA_NO_NODE) {
 495                 node = x86_pci_root_bus_node(busnum);
 496                 if (node != 0 && node != NUMA_NO_NODE)
 497                         dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
 498                                 node);
 499         }
 500
 501         if (node != NUMA_NO_NODE && !node_online(node))
 502                 node = NUMA_NO_NODE;
 503
 504         info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
 505         if (!info) {
 506                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 507                        "ignored (out of memory)\n", domain, busnum);
 508                 return NULL;
 509         }
 510
 511         sd = &info->sd;
 512         sd->domain = domain;
 513         sd->node = node;
 514         sd->companion = device;
 515
 516         bus = pci_find_bus(domain, busnum);
 517         if (bus) {
 518                 /*
 519                  * If the desired bus has been scanned already, replace
 520                  * its bus->sysdata.
 521                  */
 522                 memcpy(bus->sysdata, sd, sizeof(*sd));
 523                 kfree(info);
 524         } else {
 525                 probe_pci_root_info(info, device, busnum, domain);
 526
 527                 /* insert busn res at first */
 528                 pci_add_resource(&resources,  &root->secondary);
 529                 /*
 530                  * _CRS with no apertures is normal, so only fall back to
 531                  * defaults or native bridge info if we're ignoring _CRS.
 532                  */
 533                 if (pci_use_crs)
 534                         add_resources(info, &resources);
 535                 else {
 536                         free_pci_root_info_res(info);
 537                         x86_pci_root_bus_resources(busnum, &resources);
 538                 }
 539
 540                 if (!setup_mcfg_map(info, domain, (u8)root->secondary.start,
 541                                     (u8)root->secondary.end, root->mcfg_addr))
 542                         bus = pci_create_root_bus(NULL, busnum, &pci_root_ops,
 543                                                   sd, &resources);
 544
 545                 if (bus) {
 546                         pci_scan_child_bus(bus);
 547                         pci_set_host_bridge_release(
 548                                 to_pci_host_bridge(bus->bridge),
 549                                 release_pci_root_info, info);
 550                 } else {
 551                         pci_free_resource_list(&resources);
 552                         __release_pci_root_info(info);
 553                 }
 554         }
 555
 556         /* After the PCI-E bus has been walked and all devices discovered,
 557          * configure any settings of the fabric that might be necessary.
 558          */
 559         if (bus) {
 560                 struct pci_bus *child;
 561                 list_for_each_entry(child, &bus->children, node)
 562                         pcie_bus_configure_settings(child);
 563         }
 564
 565         if (bus && node != NUMA_NO_NODE)
 566                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
 567
 568         return bus;
 569 }
 570
 571 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 572 {
 573         struct pci_sysdata *sd = bridge->bus->sysdata;
 574
 575         ACPI_COMPANION_SET(&bridge->dev, sd->companion);
 576         return 0;
 577 }
 578
 579 int __init pci_acpi_init(void)
 580 {
 581         struct pci_dev *dev = NULL;
 582
 583         if (acpi_noirq)
 584                 return -ENODEV;
 585
 586         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 587         acpi_irq_penalty_init();
 588         pcibios_enable_irq = acpi_pci_irq_enable;
 589         pcibios_disable_irq = acpi_pci_irq_disable;
 590         x86_init.pci.init_irq = x86_init_noop;
 591
 592         if (pci_routeirq) {
 593                 /*
 594                  * PCI IRQ routing is set up by pci_enable_device(), but we
 595                  * also do it here in case there are still broken drivers that
 596                  * don't use pci_enable_device().
 597                  */
 598                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 599                 for_each_pci_dev(dev)
 600                         acpi_pci_irq_enable(dev);
 601         }
 602
 603         return 0;
 604 }