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                         DMI_MATCH(DMI_BIOS_VERSION, "V1.6"),
  66                 },
  67         },
  68         {}
  69 };
  70
  71 void __init pci_acpi_crs_quirks(void)
  72 {
  73         int year;
  74
  75         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
  76                 pci_use_crs = false;
  77
  78         dmi_check_system(pci_use_crs_table);
  79
  80         /*
  81          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
  82          * takes precedence over anything we figured out above.
  83          */
  84         if (pci_probe & PCI_ROOT_NO_CRS)
  85                 pci_use_crs = false;
  86         else if (pci_probe & PCI_USE__CRS)
  87                 pci_use_crs = true;
  88
  89         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
  90                "if necessary, use \"pci=%s\" and report a bug\n",
  91                pci_use_crs ? "Using" : "Ignoring",
  92                pci_use_crs ? "nocrs" : "use_crs");
  93 }
  94
  95 static acpi_status
  96 resource_to_addr(struct acpi_resource *resource,
  97                         struct acpi_resource_address64 *addr)
  98 {
  99         acpi_status status;
 100         struct acpi_resource_memory24 *memory24;
 101         struct acpi_resource_memory32 *memory32;
 102         struct acpi_resource_fixed_memory32 *fixed_memory32;
 103
 104         memset(addr, 0, sizeof(*addr));
 105         switch (resource->type) {
 106         case ACPI_RESOURCE_TYPE_MEMORY24:
 107                 memory24 = &resource->data.memory24;
 108                 addr->resource_type = ACPI_MEMORY_RANGE;
 109                 addr->minimum = memory24->minimum;
 110                 addr->address_length = memory24->address_length;
 111                 addr->maximum = addr->minimum + addr->address_length - 1;
 112                 return AE_OK;
 113         case ACPI_RESOURCE_TYPE_MEMORY32:
 114                 memory32 = &resource->data.memory32;
 115                 addr->resource_type = ACPI_MEMORY_RANGE;
 116                 addr->minimum = memory32->minimum;
 117                 addr->address_length = memory32->address_length;
 118                 addr->maximum = addr->minimum + addr->address_length - 1;
 119                 return AE_OK;
 120         case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
 121                 fixed_memory32 = &resource->data.fixed_memory32;
 122                 addr->resource_type = ACPI_MEMORY_RANGE;
 123                 addr->minimum = fixed_memory32->address;
 124                 addr->address_length = fixed_memory32->address_length;
 125                 addr->maximum = addr->minimum + addr->address_length - 1;
 126                 return AE_OK;
 127         case ACPI_RESOURCE_TYPE_ADDRESS16:
 128         case ACPI_RESOURCE_TYPE_ADDRESS32:
 129         case ACPI_RESOURCE_TYPE_ADDRESS64:
 130                 status = acpi_resource_to_address64(resource, addr);
 131                 if (ACPI_SUCCESS(status) &&
 132                     (addr->resource_type == ACPI_MEMORY_RANGE ||
 133                     addr->resource_type == ACPI_IO_RANGE) &&
 134                     addr->address_length > 0) {
 135                         return AE_OK;
 136                 }
 137                 break;
 138         }
 139         return AE_ERROR;
 140 }
 141
 142 static acpi_status
 143 count_resource(struct acpi_resource *acpi_res, void *data)
 144 {
 145         struct pci_root_info *info = data;
 146         struct acpi_resource_address64 addr;
 147         acpi_status status;
 148
 149         status = resource_to_addr(acpi_res, &addr);
 150         if (ACPI_SUCCESS(status))
 151                 info->res_num++;
 152         return AE_OK;
 153 }
 154
 155 static acpi_status
 156 setup_resource(struct acpi_resource *acpi_res, void *data)
 157 {
 158         struct pci_root_info *info = data;
 159         struct resource *res;
 160         struct acpi_resource_address64 addr;
 161         acpi_status status;
 162         unsigned long flags;
 163         u64 start, orig_end, end;
 164
 165         status = resource_to_addr(acpi_res, &addr);
 166         if (!ACPI_SUCCESS(status))
 167                 return AE_OK;
 168
 169         if (addr.resource_type == ACPI_MEMORY_RANGE) {
 170                 flags = IORESOURCE_MEM;
 171                 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
 172                         flags |= IORESOURCE_PREFETCH;
 173         } else if (addr.resource_type == ACPI_IO_RANGE) {
 174                 flags = IORESOURCE_IO;
 175         } else
 176                 return AE_OK;
 177
 178         start = addr.minimum + addr.translation_offset;
 179         orig_end = end = addr.maximum + addr.translation_offset;
 180
 181         /* Exclude non-addressable range or non-addressable portion of range */
 182         end = min(end, (u64)iomem_resource.end);
 183         if (end <= start) {
 184                 dev_info(&info->bridge->dev,
 185                         "host bridge window [%#llx-%#llx] "
 186                         "(ignored, not CPU addressable)\n", start, orig_end);
 187                 return AE_OK;
 188         } else if (orig_end != end) {
 189                 dev_info(&info->bridge->dev,
 190                         "host bridge window [%#llx-%#llx] "
 191                         "([%#llx-%#llx] ignored, not CPU addressable)\n",
 192                         start, orig_end, end + 1, orig_end);
 193         }
 194
 195         res = &info->res[info->res_num];
 196         res->name = info->name;
 197         res->flags = flags;
 198         res->start = start;
 199         res->end = end;
 200         res->child = NULL;
 201
 202         if (!pci_use_crs) {
 203                 dev_printk(KERN_DEBUG, &info->bridge->dev,
 204                            "host bridge window %pR (ignored)\n", res);
 205                 return AE_OK;
 206         }
 207
 208         info->res_num++;
 209         if (addr.translation_offset)
 210                 dev_info(&info->bridge->dev, "host bridge window %pR "
 211                          "(PCI address [%#llx-%#llx])\n",
 212                          res, res->start - addr.translation_offset,
 213                          res->end - addr.translation_offset);
 214         else
 215                 dev_info(&info->bridge->dev, "host bridge window %pR\n", res);
 216
 217         return AE_OK;
 218 }
 219
 220 static bool resource_contains(struct resource *res, resource_size_t point)
 221 {
 222         if (res->start <= point && point <= res->end)
 223                 return true;
 224         return false;
 225 }
 226
 227 static void coalesce_windows(struct pci_root_info *info, unsigned long type)
 228 {
 229         int i, j;
 230         struct resource *res1, *res2;
 231
 232         for (i = 0; i < info->res_num; i++) {
 233                 res1 = &info->res[i];
 234                 if (!(res1->flags & type))
 235                         continue;
 236
 237                 for (j = i + 1; j < info->res_num; j++) {
 238                         res2 = &info->res[j];
 239                         if (!(res2->flags & type))
 240                                 continue;
 241
 242                         /*
 243                          * I don't like throwing away windows because then
 244                          * our resources no longer match the ACPI _CRS, but
 245                          * the kernel resource tree doesn't allow overlaps.
 246                          */
 247                         if (resource_contains(res1, res2->start) ||
 248                             resource_contains(res1, res2->end) ||
 249                             resource_contains(res2, res1->start) ||
 250                             resource_contains(res2, res1->end)) {
 251                                 res1->start = min(res1->start, res2->start);
 252                                 res1->end = max(res1->end, res2->end);
 253                                 dev_info(&info->bridge->dev,
 254                                          "host bridge window expanded to %pR; %pR ignored\n",
 255                                          res1, res2);
 256                                 res2->flags = 0;
 257                         }
 258                 }
 259         }
 260 }
 261
 262 static void add_resources(struct pci_root_info *info)
 263 {
 264         int i;
 265         struct resource *res, *root, *conflict;
 266
 267         if (!pci_use_crs)
 268                 return;
 269
 270         coalesce_windows(info, IORESOURCE_MEM);
 271         coalesce_windows(info, IORESOURCE_IO);
 272
 273         for (i = 0; i < info->res_num; i++) {
 274                 res = &info->res[i];
 275
 276                 if (res->flags & IORESOURCE_MEM)
 277                         root = &iomem_resource;
 278                 else if (res->flags & IORESOURCE_IO)
 279                         root = &ioport_resource;
 280                 else
 281                         continue;
 282
 283                 conflict = insert_resource_conflict(root, res);
 284                 if (conflict)
 285                         dev_info(&info->bridge->dev,
 286                                  "ignoring host bridge window %pR (conflicts with %s %pR)\n",
 287                                  res, conflict->name, conflict);
 288                 else
 289                         pci_bus_add_resource(info->bus, res, 0);
 290         }
 291 }
 292
 293 static void
 294 get_current_resources(struct acpi_device *device, int busnum,
 295                         int domain, struct pci_bus *bus)
 296 {
 297         struct pci_root_info info;
 298         size_t size;
 299
 300         if (pci_use_crs)
 301                 pci_bus_remove_resources(bus);
 302
 303         info.bridge = device;
 304         info.bus = bus;
 305         info.res_num = 0;
 306         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
 307                                 &info);
 308         if (!info.res_num)
 309                 return;
 310
 311         size = sizeof(*info.res) * info.res_num;
 312         info.res = kmalloc(size, GFP_KERNEL);
 313         if (!info.res)
 314                 goto res_alloc_fail;
 315
 316         info.name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum);
 317         if (!info.name)
 318                 goto name_alloc_fail;
 319
 320         info.res_num = 0;
 321         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
 322                                 &info);
 323
 324         add_resources(&info);
 325         return;
 326
 327 name_alloc_fail:
 328         kfree(info.res);
 329 res_alloc_fail:
 330         return;
 331 }
 332
 333 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
 334 {
 335         struct acpi_device *device = root->device;
 336         int domain = root->segment;
 337         int busnum = root->secondary.start;
 338         struct pci_bus *bus;
 339         struct pci_sysdata *sd;
 340         int node;
 341 #ifdef CONFIG_ACPI_NUMA
 342         int pxm;
 343 #endif
 344
 345         if (domain && !pci_domains_supported) {
 346                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 347                        "ignored (multiple domains not supported)\n",
 348                        domain, busnum);
 349                 return NULL;
 350         }
 351
 352         node = -1;
 353 #ifdef CONFIG_ACPI_NUMA
 354         pxm = acpi_get_pxm(device->handle);
 355         if (pxm >= 0)
 356                 node = pxm_to_node(pxm);
 357         if (node != -1)
 358                 set_mp_bus_to_node(busnum, node);
 359         else
 360 #endif
 361                 node = get_mp_bus_to_node(busnum);
 362
 363         if (node != -1 && !node_online(node))
 364                 node = -1;
 365
 366         /* Allocate per-root-bus (not per bus) arch-specific data.
 367          * TODO: leak; this memory is never freed.
 368          * It's arguable whether it's worth the trouble to care.
 369          */
 370         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 371         if (!sd) {
 372                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 373                        "ignored (out of memory)\n", domain, busnum);
 374                 return NULL;
 375         }
 376
 377         sd->domain = domain;
 378         sd->node = node;
 379         /*
 380          * Maybe the desired pci bus has been already scanned. In such case
 381          * it is unnecessary to scan the pci bus with the given domain,busnum.
 382          */
 383         bus = pci_find_bus(domain, busnum);
 384         if (bus) {
 385                 /*
 386                  * If the desired bus exits, the content of bus->sysdata will
 387                  * be replaced by sd.
 388                  */
 389                 memcpy(bus->sysdata, sd, sizeof(*sd));
 390                 kfree(sd);
 391         } else {
 392                 bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
 393                 if (bus) {
 394                         get_current_resources(device, busnum, domain, bus);
 395                         bus->subordinate = pci_scan_child_bus(bus);
 396                 }
 397         }
 398
 399         /* After the PCI-E bus has been walked and all devices discovered,
 400          * configure any settings of the fabric that might be necessary.
 401          */
 402         if (bus) {
 403                 struct pci_bus *child;
 404                 list_for_each_entry(child, &bus->children, node) {
 405                         struct pci_dev *self = child->self;
 406                         if (!self)
 407                                 continue;
 408
 409                         pcie_bus_configure_settings(child, self->pcie_mpss);
 410                 }
 411         }
 412
 413         if (!bus)
 414                 kfree(sd);
 415
 416         if (bus && node != -1) {
 417 #ifdef CONFIG_ACPI_NUMA
 418                 if (pxm >= 0)
 419                         dev_printk(KERN_DEBUG, &bus->dev,
 420                                    "on NUMA node %d (pxm %d)\n", node, pxm);
 421 #else
 422                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
 423 #endif
 424         }
 425
 426         return bus;
 427 }
 428
 429 int __init pci_acpi_init(void)
 430 {
 431         struct pci_dev *dev = NULL;
 432
 433         if (acpi_noirq)
 434                 return -ENODEV;
 435
 436         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 437         acpi_irq_penalty_init();
 438         pcibios_enable_irq = acpi_pci_irq_enable;
 439         pcibios_disable_irq = acpi_pci_irq_disable;
 440         x86_init.pci.init_irq = x86_init_noop;
 441
 442         if (pci_routeirq) {
 443                 /*
 444                  * PCI IRQ routing is set up by pci_enable_device(), but we
 445                  * also do it here in case there are still broken drivers that
 446                  * don't use pci_enable_device().
 447                  */
 448                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 449                 for_each_pci_dev(dev)
 450                         acpi_pci_irq_enable(dev);
 451         }
 452
 453         return 0;
 454 }