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