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         struct pci_sysdata sd;
  14 #ifdef  CONFIG_PCI_MMCONFIG
  15         bool mcfg_added;
  16         u16 segment;
  17         u8 start_bus;
  18         u8 end_bus;
  19 #endif
  20 };
  21
  22 static bool pci_use_crs = true;
  23 static bool pci_ignore_seg = false;
  24
  25 static int __init set_use_crs(const struct dmi_system_id *id)
  26 {
  27         pci_use_crs = true;
  28         return 0;
  29 }
  30
  31 static int __init set_nouse_crs(const struct dmi_system_id *id)
  32 {
  33         pci_use_crs = false;
  34         return 0;
  35 }
  36
  37 static int __init set_ignore_seg(const struct dmi_system_id *id)
  38 {
  39         printk(KERN_INFO "PCI: %s detected: ignoring ACPI _SEG\n", id->ident);
  40         pci_ignore_seg = true;
  41         return 0;
  42 }
  43
  44 static const struct dmi_system_id pci_crs_quirks[] __initconst = {
  45         /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
  46         {
  47                 .callback = set_use_crs,
  48                 .ident = "IBM System x3800",
  49                 .matches = {
  50                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
  51                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
  52                 },
  53         },
  54         /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
  55         /* 2006 AMD HT/VIA system with two host bridges */
  56         {
  57                 .callback = set_use_crs,
  58                 .ident = "ASRock ALiveSATA2-GLAN",
  59                 .matches = {
  60                         DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
  61                 },
  62         },
  63         /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
  64         /* 2006 AMD HT/VIA system with two host bridges */
  65         {
  66                 .callback = set_use_crs,
  67                 .ident = "ASUS M2V-MX SE",
  68                 .matches = {
  69                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
  70                         DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
  71                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
  72                 },
  73         },
  74         /* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
  75         {
  76                 .callback = set_use_crs,
  77                 .ident = "MSI MS-7253",
  78                 .matches = {
  79                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
  80                         DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
  81                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
  82                 },
  83         },
  84         /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */
  85         /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */
  86         {
  87                 .callback = set_use_crs,
  88                 .ident = "Foxconn K8M890-8237A",
  89                 .matches = {
  90                         DMI_MATCH(DMI_BOARD_VENDOR, "Foxconn"),
  91                         DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"),
  92                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
  93                 },
  94         },
  95
  96         /* Now for the blacklist.. */
  97
  98         /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
  99         {
 100                 .callback = set_nouse_crs,
 101                 .ident = "Dell Studio 1557",
 102                 .matches = {
 103                         DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
 104                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
 105                         DMI_MATCH(DMI_BIOS_VERSION, "A09"),
 106                 },
 107         },
 108         /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
 109         {
 110                 .callback = set_nouse_crs,
 111                 .ident = "Thinkpad SL510",
 112                 .matches = {
 113                         DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 114                         DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
 115                         DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
 116                 },
 117         },
 118
 119         /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
 120         {
 121                 .callback = set_ignore_seg,
 122                 .ident = "HP xw9300",
 123                 .matches = {
 124                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 125                         DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
 126                 },
 127         },
 128         {}
 129 };
 130
 131 void __init pci_acpi_crs_quirks(void)
 132 {
 133         int year;
 134
 135         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
 136                 pci_use_crs = false;
 137
 138         dmi_check_system(pci_crs_quirks);
 139
 140         /*
 141          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
 142          * takes precedence over anything we figured out above.
 143          */
 144         if (pci_probe & PCI_ROOT_NO_CRS)
 145                 pci_use_crs = false;
 146         else if (pci_probe & PCI_USE__CRS)
 147                 pci_use_crs = true;
 148
 149         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
 150                "if necessary, use \"pci=%s\" and report a bug\n",
 151                pci_use_crs ? "Using" : "Ignoring",
 152                pci_use_crs ? "nocrs" : "use_crs");
 153 }
 154
 155 #ifdef  CONFIG_PCI_MMCONFIG
 156 static int check_segment(u16 seg, struct device *dev, char *estr)
 157 {
 158         if (seg) {
 159                 dev_err(dev,
 160                         "%s can't access PCI configuration "
 161                         "space under this host bridge.\n",
 162                         estr);
 163                 return -EIO;
 164         }
 165
 166         /*
 167          * Failure in adding MMCFG information is not fatal,
 168          * just can't access extended configuration space of
 169          * devices under this host bridge.
 170          */
 171         dev_warn(dev,
 172                  "%s can't access extended PCI configuration "
 173                  "space under this bridge.\n",
 174                  estr);
 175
 176         return 0;
 177 }
 178
 179 static int setup_mcfg_map(struct pci_root_info *info, u16 seg, u8 start,
 180                           u8 end, phys_addr_t addr)
 181 {
 182         int result;
 183         struct device *dev = &info->bridge->dev;
 184
 185         info->start_bus = start;
 186         info->end_bus = end;
 187         info->mcfg_added = false;
 188
 189         /* return success if MMCFG is not in use */
 190         if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
 191                 return 0;
 192
 193         if (!(pci_probe & PCI_PROBE_MMCONF))
 194                 return check_segment(seg, dev, "MMCONFIG is disabled,");
 195
 196         result = pci_mmconfig_insert(dev, seg, start, end, addr);
 197         if (result == 0) {
 198                 /* enable MMCFG if it hasn't been enabled yet */
 199                 if (raw_pci_ext_ops == NULL)
 200                         raw_pci_ext_ops = &pci_mmcfg;
 201                 info->mcfg_added = true;
 202         } else if (result != -EEXIST)
 203                 return check_segment(seg, dev,
 204                          "fail to add MMCONFIG information,");
 205
 206         return 0;
 207 }
 208
 209 static void teardown_mcfg_map(struct pci_root_info *info)
 210 {
 211         if (info->mcfg_added) {
 212                 pci_mmconfig_delete(info->segment, info->start_bus,
 213                                     info->end_bus);
 214                 info->mcfg_added = false;
 215         }
 216 }
 217 #else
 218 static int setup_mcfg_map(struct pci_root_info *info,
 219                                     u16 seg, u8 start, u8 end,
 220                                     phys_addr_t addr)
 221 {
 222         return 0;
 223 }
 224 static void teardown_mcfg_map(struct pci_root_info *info)
 225 {
 226 }
 227 #endif
 228
 229 static void validate_resources(struct device *dev, struct list_head *crs_res,
 230                                unsigned long type)
 231 {
 232         LIST_HEAD(list);
 233         struct resource *res1, *res2, *root = NULL;
 234         struct resource_entry *tmp, *entry, *entry2;
 235
 236         BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
 237         root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
 238
 239         list_splice_init(crs_res, &list);
 240         resource_list_for_each_entry_safe(entry, tmp, &list) {
 241                 bool free = false;
 242                 resource_size_t end;
 243
 244                 res1 = entry->res;
 245                 if (!(res1->flags & type))
 246                         goto next;
 247
 248                 /* Exclude non-addressable range or non-addressable portion */
 249                 end = min(res1->end, root->end);
 250                 if (end <= res1->start) {
 251                         dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
 252                                  res1);
 253                         free = true;
 254                         goto next;
 255                 } else if (res1->end != end) {
 256                         dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
 257                                  res1, (unsigned long long)end + 1,
 258                                  (unsigned long long)res1->end);
 259                         res1->end = end;
 260                 }
 261
 262                 resource_list_for_each_entry(entry2, crs_res) {
 263                         res2 = entry2->res;
 264                         if (!(res2->flags & type))
 265                                 continue;
 266
 267                         /*
 268                          * I don't like throwing away windows because then
 269                          * our resources no longer match the ACPI _CRS, but
 270                          * the kernel resource tree doesn't allow overlaps.
 271                          */
 272                         if (resource_overlaps(res1, res2)) {
 273                                 res2->start = min(res1->start, res2->start);
 274                                 res2->end = max(res1->end, res2->end);
 275                                 dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
 276                                          res2, res1);
 277                                 free = true;
 278                                 goto next;
 279                         }
 280                 }
 281
 282 next:
 283                 resource_list_del(entry);
 284                 if (free)
 285                         resource_list_free_entry(entry);
 286                 else
 287                         resource_list_add_tail(entry, crs_res);
 288         }
 289 }
 290
 291 static void add_resources(struct pci_root_info *info,
 292                           struct list_head *resources,
 293                           struct list_head *crs_res)
 294 {
 295         struct resource_entry *entry, *tmp;
 296         struct resource *res, *conflict, *root = NULL;
 297
 298         validate_resources(&info->bridge->dev, crs_res, IORESOURCE_MEM);
 299         validate_resources(&info->bridge->dev, crs_res, IORESOURCE_IO);
 300
 301         resource_list_for_each_entry_safe(entry, tmp, crs_res) {
 302                 res = entry->res;
 303                 if (res->flags & IORESOURCE_MEM)
 304                         root = &iomem_resource;
 305                 else if (res->flags & IORESOURCE_IO)
 306                         root = &ioport_resource;
 307                 else
 308                         BUG_ON(res);
 309
 310                 conflict = insert_resource_conflict(root, res);
 311                 if (conflict) {
 312                         dev_info(&info->bridge->dev,
 313                                  "ignoring host bridge window %pR (conflicts with %s %pR)\n",
 314                                  res, conflict->name, conflict);
 315                         resource_list_destroy_entry(entry);
 316                 }
 317         }
 318
 319         list_splice_tail(crs_res, resources);
 320 }
 321
 322 static void release_pci_root_info(struct pci_host_bridge *bridge)
 323 {
 324         struct resource *res;
 325         struct resource_entry *entry;
 326         struct pci_root_info *info = bridge->release_data;
 327
 328         resource_list_for_each_entry(entry, &bridge->windows) {
 329                 res = entry->res;
 330                 if (res->parent &&
 331                     (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
 332                         release_resource(res);
 333         }
 334
 335         teardown_mcfg_map(info);
 336         kfree(info);
 337 }
 338
 339 static void probe_pci_root_info(struct pci_root_info *info,
 340                                 struct acpi_device *device,
 341                                 int busnum, int domain,
 342                                 struct list_head *list)
 343 {
 344         int ret;
 345         struct resource_entry *entry, *tmp;
 346
 347         sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum);
 348         info->bridge = device;
 349         ret = acpi_dev_get_resources(device, list,
 350                                      acpi_dev_filter_resource_type_cb,
 351                                      (void *)(IORESOURCE_IO | IORESOURCE_MEM));
 352         if (ret < 0)
 353                 dev_warn(&device->dev,
 354                          "failed to parse _CRS method, error code %d\n", ret);
 355         else if (ret == 0)
 356                 dev_dbg(&device->dev,
 357                         "no IO and memory resources present in _CRS\n");
 358         else
 359                 resource_list_for_each_entry_safe(entry, tmp, list) {
 360                         if ((entry->res->flags & IORESOURCE_WINDOW) == 0 ||
 361                             (entry->res->flags & IORESOURCE_DISABLED))
 362                                 resource_list_destroy_entry(entry);
 363                         else
 364                                 entry->res->name = info->name;
 365                 }
 366 }
 367
 368 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 369 {
 370         struct acpi_device *device = root->device;
 371         struct pci_root_info *info;
 372         int domain = root->segment;
 373         int busnum = root->secondary.start;
 374         struct resource_entry *res_entry;
 375         LIST_HEAD(crs_res);
 376         LIST_HEAD(resources);
 377         struct pci_bus *bus;
 378         struct pci_sysdata *sd;
 379         int node;
 380
 381         if (pci_ignore_seg)
 382                 domain = 0;
 383
 384         if (domain && !pci_domains_supported) {
 385                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 386                        "ignored (multiple domains not supported)\n",
 387                        domain, busnum);
 388                 return NULL;
 389         }
 390
 391         node = acpi_get_node(device->handle);
 392         if (node == NUMA_NO_NODE) {
 393                 node = x86_pci_root_bus_node(busnum);
 394                 if (node != 0 && node != NUMA_NO_NODE)
 395                         dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
 396                                 node);
 397         }
 398
 399         if (node != NUMA_NO_NODE && !node_online(node))
 400                 node = NUMA_NO_NODE;
 401
 402         info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
 403         if (!info) {
 404                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 405                        "ignored (out of memory)\n", domain, busnum);
 406                 return NULL;
 407         }
 408
 409         sd = &info->sd;
 410         sd->domain = domain;
 411         sd->node = node;
 412         sd->companion = device;
 413
 414         bus = pci_find_bus(domain, busnum);
 415         if (bus) {
 416                 /*
 417                  * If the desired bus has been scanned already, replace
 418                  * its bus->sysdata.
 419                  */
 420                 memcpy(bus->sysdata, sd, sizeof(*sd));
 421                 kfree(info);
 422         } else {
 423                 /* insert busn res at first */
 424                 pci_add_resource(&resources,  &root->secondary);
 425
 426                 /*
 427                  * _CRS with no apertures is normal, so only fall back to
 428                  * defaults or native bridge info if we're ignoring _CRS.
 429                  */
 430                 probe_pci_root_info(info, device, busnum, domain, &crs_res);
 431                 if (pci_use_crs) {
 432                         add_resources(info, &resources, &crs_res);
 433                 } else {
 434                         resource_list_for_each_entry(res_entry, &crs_res)
 435                                 dev_printk(KERN_DEBUG, &device->dev,
 436                                            "host bridge window %pR (ignored)\n",
 437                                            res_entry->res);
 438                         resource_list_free(&crs_res);
 439                         x86_pci_root_bus_resources(busnum, &resources);
 440                 }
 441
 442                 if (!setup_mcfg_map(info, domain, (u8)root->secondary.start,
 443                                     (u8)root->secondary.end, root->mcfg_addr))
 444                         bus = pci_create_root_bus(NULL, busnum, &pci_root_ops,
 445                                                   sd, &resources);
 446
 447                 if (bus) {
 448                         pci_scan_child_bus(bus);
 449                         pci_set_host_bridge_release(
 450                                 to_pci_host_bridge(bus->bridge),
 451                                 release_pci_root_info, info);
 452                 } else {
 453                         resource_list_free(&resources);
 454                         teardown_mcfg_map(info);
 455                         kfree(info);
 456                 }
 457         }
 458
 459         /* After the PCI-E bus has been walked and all devices discovered,
 460          * configure any settings of the fabric that might be necessary.
 461          */
 462         if (bus) {
 463                 struct pci_bus *child;
 464                 list_for_each_entry(child, &bus->children, node)
 465                         pcie_bus_configure_settings(child);
 466         }
 467
 468         if (bus && node != NUMA_NO_NODE)
 469                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
 470
 471         return bus;
 472 }
 473
 474 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 475 {
 476         struct pci_sysdata *sd = bridge->bus->sysdata;
 477
 478         ACPI_COMPANION_SET(&bridge->dev, sd->companion);
 479         return 0;
 480 }
 481
 482 int __init pci_acpi_init(void)
 483 {
 484         struct pci_dev *dev = NULL;
 485
 486         if (acpi_noirq)
 487                 return -ENODEV;
 488
 489         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 490         acpi_irq_penalty_init();
 491         pcibios_enable_irq = acpi_pci_irq_enable;
 492         pcibios_disable_irq = acpi_pci_irq_disable;
 493         x86_init.pci.init_irq = x86_init_noop;
 494
 495         if (pci_routeirq) {
 496                 /*
 497                  * PCI IRQ routing is set up by pci_enable_device(), but we
 498                  * also do it here in case there are still broken drivers that
 499                  * don't use pci_enable_device().
 500                  */
 501                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 502                 for_each_pci_dev(dev)
 503                         acpi_pci_irq_enable(dev);
 504         }
 505
 506         return 0;
 507 }