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