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