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