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