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->minimum = memory24->minimum;
 235                 addr->address_length = memory24->address_length;
 236                 addr->maximum = addr->minimum + addr->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->minimum = memory32->minimum;
 242                 addr->address_length = memory32->address_length;
 243                 addr->maximum = addr->minimum + addr->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->minimum = fixed_memory32->address;
 249                 addr->address_length = fixed_memory32->address_length;
 250                 addr->maximum = addr->minimum + addr->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_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;
 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         } else if (addr.resource_type == ACPI_IO_RANGE) {
 297                 flags = IORESOURCE_IO;
 298         } else
 299                 return AE_OK;
 300
 301         start = addr.minimum + addr.translation_offset;
 302         orig_end = end = addr.maximum + addr.translation_offset;
 303
 304         /* Exclude non-addressable range or non-addressable portion of range */
 305         end = min(end, (u64)iomem_resource.end);
 306         if (end <= start) {
 307                 dev_info(&info->bridge->dev,
 308                         "host bridge window [%#llx-%#llx] "
 309                         "(ignored, not CPU addressable)\n", start, orig_end);
 310                 return AE_OK;
 311         } else if (orig_end != end) {
 312                 dev_info(&info->bridge->dev,
 313                         "host bridge window [%#llx-%#llx] "
 314                         "([%#llx-%#llx] ignored, not CPU addressable)\n",
 315                         start, orig_end, end + 1, orig_end);
 316         }
 317
 318         res = &info->res[info->res_num];
 319         res->name = info->name;
 320         res->flags = flags;
 321         res->start = start;
 322         res->end = end;
 323         info->res_offset[info->res_num] = addr.translation_offset;
 324         info->res_num++;
 325
 326         if (!pci_use_crs)
 327                 dev_printk(KERN_DEBUG, &info->bridge->dev,
 328                            "host bridge window %pR (ignored)\n", res);
 329
 330         return AE_OK;
 331 }
 332
 333 static void coalesce_windows(struct pci_root_info *info, unsigned long type)
 334 {
 335         int i, j;
 336         struct resource *res1, *res2;
 337
 338         for (i = 0; i < info->res_num; i++) {
 339                 res1 = &info->res[i];
 340                 if (!(res1->flags & type))
 341                         continue;
 342
 343                 for (j = i + 1; j < info->res_num; j++) {
 344                         res2 = &info->res[j];
 345                         if (!(res2->flags & type))
 346                                 continue;
 347
 348                         /*
 349                          * I don't like throwing away windows because then
 350                          * our resources no longer match the ACPI _CRS, but
 351                          * the kernel resource tree doesn't allow overlaps.
 352                          */
 353                         if (resource_overlaps(res1, res2)) {
 354                                 res2->start = min(res1->start, res2->start);
 355                                 res2->end = max(res1->end, res2->end);
 356                                 dev_info(&info->bridge->dev,
 357                                          "host bridge window expanded to %pR; %pR ignored\n",
 358                                          res2, res1);
 359                                 res1->flags = 0;
 360                         }
 361                 }
 362         }
 363 }
 364
 365 static void add_resources(struct pci_root_info *info,
 366                           struct list_head *resources)
 367 {
 368         int i;
 369         struct resource *res, *root, *conflict;
 370
 371         coalesce_windows(info, IORESOURCE_MEM);
 372         coalesce_windows(info, IORESOURCE_IO);
 373
 374         for (i = 0; i < info->res_num; i++) {
 375                 res = &info->res[i];
 376
 377                 if (res->flags & IORESOURCE_MEM)
 378                         root = &iomem_resource;
 379                 else if (res->flags & IORESOURCE_IO)
 380                         root = &ioport_resource;
 381                 else
 382                         continue;
 383
 384                 conflict = insert_resource_conflict(root, res);
 385                 if (conflict)
 386                         dev_info(&info->bridge->dev,
 387                                  "ignoring host bridge window %pR (conflicts with %s %pR)\n",
 388                                  res, conflict->name, conflict);
 389                 else
 390                         pci_add_resource_offset(resources, res,
 391                                         info->res_offset[i]);
 392         }
 393 }
 394
 395 static void free_pci_root_info_res(struct pci_root_info *info)
 396 {
 397         kfree(info->res);
 398         info->res = NULL;
 399         kfree(info->res_offset);
 400         info->res_offset = NULL;
 401         info->res_num = 0;
 402 }
 403
 404 static void __release_pci_root_info(struct pci_root_info *info)
 405 {
 406         int i;
 407         struct resource *res;
 408
 409         for (i = 0; i < info->res_num; i++) {
 410                 res = &info->res[i];
 411
 412                 if (!res->parent)
 413                         continue;
 414
 415                 if (!(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
 416                         continue;
 417
 418                 release_resource(res);
 419         }
 420
 421         free_pci_root_info_res(info);
 422
 423         teardown_mcfg_map(info);
 424
 425         kfree(info);
 426 }
 427
 428 static void release_pci_root_info(struct pci_host_bridge *bridge)
 429 {
 430         struct pci_root_info *info = bridge->release_data;
 431
 432         __release_pci_root_info(info);
 433 }
 434
 435 static void probe_pci_root_info(struct pci_root_info *info,
 436                                 struct acpi_device *device,
 437                                 int busnum, int domain)
 438 {
 439         size_t size;
 440
 441         sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum);
 442         info->bridge = device;
 443
 444         info->res_num = 0;
 445         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
 446                                 info);
 447         if (!info->res_num)
 448                 return;
 449
 450         size = sizeof(*info->res) * info->res_num;
 451         info->res = kzalloc_node(size, GFP_KERNEL, info->sd.node);
 452         if (!info->res) {
 453                 info->res_num = 0;
 454                 return;
 455         }
 456
 457         size = sizeof(*info->res_offset) * info->res_num;
 458         info->res_num = 0;
 459         info->res_offset = kzalloc_node(size, GFP_KERNEL, info->sd.node);
 460         if (!info->res_offset) {
 461                 kfree(info->res);
 462                 info->res = NULL;
 463                 return;
 464         }
 465
 466         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
 467                                 info);
 468 }
 469
 470 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 471 {
 472         struct acpi_device *device = root->device;
 473         struct pci_root_info *info;
 474         int domain = root->segment;
 475         int busnum = root->secondary.start;
 476         LIST_HEAD(resources);
 477         struct pci_bus *bus;
 478         struct pci_sysdata *sd;
 479         int node;
 480
 481         if (pci_ignore_seg)
 482                 domain = 0;
 483
 484         if (domain && !pci_domains_supported) {
 485                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 486                        "ignored (multiple domains not supported)\n",
 487                        domain, busnum);
 488                 return NULL;
 489         }
 490
 491         node = acpi_get_node(device->handle);
 492         if (node == NUMA_NO_NODE) {
 493                 node = x86_pci_root_bus_node(busnum);
 494                 if (node != 0 && node != NUMA_NO_NODE)
 495                         dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
 496                                 node);
 497         }
 498
 499         if (node != NUMA_NO_NODE && !node_online(node))
 500                 node = NUMA_NO_NODE;
 501
 502         info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
 503         if (!info) {
 504                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 505                        "ignored (out of memory)\n", domain, busnum);
 506                 return NULL;
 507         }
 508
 509         sd = &info->sd;
 510         sd->domain = domain;
 511         sd->node = node;
 512         sd->companion = device;
 513
 514         bus = pci_find_bus(domain, busnum);
 515         if (bus) {
 516                 /*
 517                  * If the desired bus has been scanned already, replace
 518                  * its bus->sysdata.
 519                  */
 520                 memcpy(bus->sysdata, sd, sizeof(*sd));
 521                 kfree(info);
 522         } else {
 523                 probe_pci_root_info(info, device, busnum, domain);
 524
 525                 /* insert busn res at first */
 526                 pci_add_resource(&resources,  &root->secondary);
 527                 /*
 528                  * _CRS with no apertures is normal, so only fall back to
 529                  * defaults or native bridge info if we're ignoring _CRS.
 530                  */
 531                 if (pci_use_crs)
 532                         add_resources(info, &resources);
 533                 else {
 534                         free_pci_root_info_res(info);
 535                         x86_pci_root_bus_resources(busnum, &resources);
 536                 }
 537
 538                 if (!setup_mcfg_map(info, domain, (u8)root->secondary.start,
 539                                     (u8)root->secondary.end, root->mcfg_addr))
 540                         bus = pci_create_root_bus(NULL, busnum, &pci_root_ops,
 541                                                   sd, &resources);
 542
 543                 if (bus) {
 544                         pci_scan_child_bus(bus);
 545                         pci_set_host_bridge_release(
 546                                 to_pci_host_bridge(bus->bridge),
 547                                 release_pci_root_info, info);
 548                 } else {
 549                         pci_free_resource_list(&resources);
 550                         __release_pci_root_info(info);
 551                 }
 552         }
 553
 554         /* After the PCI-E bus has been walked and all devices discovered,
 555          * configure any settings of the fabric that might be necessary.
 556          */
 557         if (bus) {
 558                 struct pci_bus *child;
 559                 list_for_each_entry(child, &bus->children, node)
 560                         pcie_bus_configure_settings(child);
 561         }
 562
 563         if (bus && node != NUMA_NO_NODE)
 564                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
 565
 566         return bus;
 567 }
 568
 569 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 570 {
 571         struct pci_sysdata *sd = bridge->bus->sysdata;
 572
 573         ACPI_COMPANION_SET(&bridge->dev, sd->companion);
 574         return 0;
 575 }
 576
 577 int __init pci_acpi_init(void)
 578 {
 579         struct pci_dev *dev = NULL;
 580
 581         if (acpi_noirq)
 582                 return -ENODEV;
 583
 584         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 585         acpi_irq_penalty_init();
 586         pcibios_enable_irq = acpi_pci_irq_enable;
 587         pcibios_disable_irq = acpi_pci_irq_disable;
 588         x86_init.pci.init_irq = x86_init_noop;
 589
 590         if (pci_routeirq) {
 591                 /*
 592                  * PCI IRQ routing is set up by pci_enable_device(), but we
 593                  * also do it here in case there are still broken drivers that
 594                  * don't use pci_enable_device().
 595                  */
 596                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 597                 for_each_pci_dev(dev)
 598                         acpi_pci_irq_enable(dev);
 599         }
 600
 601         return 0;
 602 }