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