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         {}
  47 };
  48
  49 void __init pci_acpi_crs_quirks(void)
  50 {
  51         int year;
  52
  53         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
  54                 pci_use_crs = false;
  55
  56         dmi_check_system(pci_use_crs_table);
  57
  58         /*
  59          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
  60          * takes precedence over anything we figured out above.
  61          */
  62         if (pci_probe & PCI_ROOT_NO_CRS)
  63                 pci_use_crs = false;
  64         else if (pci_probe & PCI_USE__CRS)
  65                 pci_use_crs = true;
  66
  67         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
  68                "if necessary, use \"pci=%s\" and report a bug\n",
  69                pci_use_crs ? "Using" : "Ignoring",
  70                pci_use_crs ? "nocrs" : "use_crs");
  71 }
  72
  73 static acpi_status
  74 resource_to_addr(struct acpi_resource *resource,
  75                         struct acpi_resource_address64 *addr)
  76 {
  77         acpi_status status;
  78         struct acpi_resource_memory24 *memory24;
  79         struct acpi_resource_memory32 *memory32;
  80         struct acpi_resource_fixed_memory32 *fixed_memory32;
  81
  82         memset(addr, 0, sizeof(*addr));
  83         switch (resource->type) {
  84         case ACPI_RESOURCE_TYPE_MEMORY24:
  85                 memory24 = &resource->data.memory24;
  86                 addr->resource_type = ACPI_MEMORY_RANGE;
  87                 addr->minimum = memory24->minimum;
  88                 addr->address_length = memory24->address_length;
  89                 addr->maximum = addr->minimum + addr->address_length - 1;
  90                 return AE_OK;
  91         case ACPI_RESOURCE_TYPE_MEMORY32:
  92                 memory32 = &resource->data.memory32;
  93                 addr->resource_type = ACPI_MEMORY_RANGE;
  94                 addr->minimum = memory32->minimum;
  95                 addr->address_length = memory32->address_length;
  96                 addr->maximum = addr->minimum + addr->address_length - 1;
  97                 return AE_OK;
  98         case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
  99                 fixed_memory32 = &resource->data.fixed_memory32;
 100                 addr->resource_type = ACPI_MEMORY_RANGE;
 101                 addr->minimum = fixed_memory32->address;
 102                 addr->address_length = fixed_memory32->address_length;
 103                 addr->maximum = addr->minimum + addr->address_length - 1;
 104                 return AE_OK;
 105         case ACPI_RESOURCE_TYPE_ADDRESS16:
 106         case ACPI_RESOURCE_TYPE_ADDRESS32:
 107         case ACPI_RESOURCE_TYPE_ADDRESS64:
 108                 status = acpi_resource_to_address64(resource, addr);
 109                 if (ACPI_SUCCESS(status) &&
 110                     (addr->resource_type == ACPI_MEMORY_RANGE ||
 111                     addr->resource_type == ACPI_IO_RANGE) &&
 112                     addr->address_length > 0) {
 113                         return AE_OK;
 114                 }
 115                 break;
 116         }
 117         return AE_ERROR;
 118 }
 119
 120 static acpi_status
 121 count_resource(struct acpi_resource *acpi_res, void *data)
 122 {
 123         struct pci_root_info *info = data;
 124         struct acpi_resource_address64 addr;
 125         acpi_status status;
 126
 127         status = resource_to_addr(acpi_res, &addr);
 128         if (ACPI_SUCCESS(status))
 129                 info->res_num++;
 130         return AE_OK;
 131 }
 132
 133 static acpi_status
 134 setup_resource(struct acpi_resource *acpi_res, void *data)
 135 {
 136         struct pci_root_info *info = data;
 137         struct resource *res;
 138         struct acpi_resource_address64 addr;
 139         acpi_status status;
 140         unsigned long flags;
 141         struct resource *root, *conflict;
 142         u64 start, end;
 143
 144         status = resource_to_addr(acpi_res, &addr);
 145         if (!ACPI_SUCCESS(status))
 146                 return AE_OK;
 147
 148         if (addr.resource_type == ACPI_MEMORY_RANGE) {
 149                 root = &iomem_resource;
 150                 flags = IORESOURCE_MEM;
 151                 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
 152                         flags |= IORESOURCE_PREFETCH;
 153         } else if (addr.resource_type == ACPI_IO_RANGE) {
 154                 root = &ioport_resource;
 155                 flags = IORESOURCE_IO;
 156         } else
 157                 return AE_OK;
 158
 159         start = addr.minimum + addr.translation_offset;
 160         end = addr.maximum + addr.translation_offset;
 161
 162         res = &info->res[info->res_num];
 163         res->name = info->name;
 164         res->flags = flags;
 165         res->start = start;
 166         res->end = end;
 167         res->child = NULL;
 168
 169         if (!pci_use_crs) {
 170                 dev_printk(KERN_DEBUG, &info->bridge->dev,
 171                            "host bridge window %pR (ignored)\n", res);
 172                 return AE_OK;
 173         }
 174
 175         conflict = insert_resource_conflict(root, res);
 176         if (conflict) {
 177                 dev_err(&info->bridge->dev,
 178                         "address space collision: host bridge window %pR "
 179                         "conflicts with %s %pR\n",
 180                         res, conflict->name, conflict);
 181         } else {
 182                 pci_bus_add_resource(info->bus, res, 0);
 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,
 191                                  "host bridge window %pR\n", res);
 192         }
 193         return AE_OK;
 194 }
 195
 196 static void
 197 get_current_resources(struct acpi_device *device, int busnum,
 198                         int domain, struct pci_bus *bus)
 199 {
 200         struct pci_root_info info;
 201         size_t size;
 202
 203         if (pci_use_crs)
 204                 pci_bus_remove_resources(bus);
 205
 206         info.bridge = device;
 207         info.bus = bus;
 208         info.res_num = 0;
 209         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
 210                                 &info);
 211         if (!info.res_num)
 212                 return;
 213
 214         size = sizeof(*info.res) * info.res_num;
 215         info.res = kmalloc(size, GFP_KERNEL);
 216         if (!info.res)
 217                 goto res_alloc_fail;
 218
 219         info.name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum);
 220         if (!info.name)
 221                 goto name_alloc_fail;
 222
 223         info.res_num = 0;
 224         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
 225                                 &info);
 226
 227         return;
 228
 229 name_alloc_fail:
 230         kfree(info.res);
 231 res_alloc_fail:
 232         return;
 233 }
 234
 235 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
 236 {
 237         struct acpi_device *device = root->device;
 238         int domain = root->segment;
 239         int busnum = root->secondary.start;
 240         struct pci_bus *bus;
 241         struct pci_sysdata *sd;
 242         int node;
 243 #ifdef CONFIG_ACPI_NUMA
 244         int pxm;
 245 #endif
 246
 247         if (domain && !pci_domains_supported) {
 248                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 249                        "ignored (multiple domains not supported)\n",
 250                        domain, busnum);
 251                 return NULL;
 252         }
 253
 254         node = -1;
 255 #ifdef CONFIG_ACPI_NUMA
 256         pxm = acpi_get_pxm(device->handle);
 257         if (pxm >= 0)
 258                 node = pxm_to_node(pxm);
 259         if (node != -1)
 260                 set_mp_bus_to_node(busnum, node);
 261         else
 262 #endif
 263                 node = get_mp_bus_to_node(busnum);
 264
 265         if (node != -1 && !node_online(node))
 266                 node = -1;
 267
 268         /* Allocate per-root-bus (not per bus) arch-specific data.
 269          * TODO: leak; this memory is never freed.
 270          * It's arguable whether it's worth the trouble to care.
 271          */
 272         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 273         if (!sd) {
 274                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 275                        "ignored (out of memory)\n", domain, busnum);
 276                 return NULL;
 277         }
 278
 279         sd->domain = domain;
 280         sd->node = node;
 281         /*
 282          * Maybe the desired pci bus has been already scanned. In such case
 283          * it is unnecessary to scan the pci bus with the given domain,busnum.
 284          */
 285         bus = pci_find_bus(domain, busnum);
 286         if (bus) {
 287                 /*
 288                  * If the desired bus exits, the content of bus->sysdata will
 289                  * be replaced by sd.
 290                  */
 291                 memcpy(bus->sysdata, sd, sizeof(*sd));
 292                 kfree(sd);
 293         } else {
 294                 bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
 295                 if (bus) {
 296                         get_current_resources(device, busnum, domain, bus);
 297                         bus->subordinate = pci_scan_child_bus(bus);
 298                 }
 299         }
 300
 301         if (!bus)
 302                 kfree(sd);
 303
 304         if (bus && node != -1) {
 305 #ifdef CONFIG_ACPI_NUMA
 306                 if (pxm >= 0)
 307                         dev_printk(KERN_DEBUG, &bus->dev,
 308                                    "on NUMA node %d (pxm %d)\n", node, pxm);
 309 #else
 310                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
 311 #endif
 312         }
 313
 314         return bus;
 315 }
 316
 317 int __init pci_acpi_init(void)
 318 {
 319         struct pci_dev *dev = NULL;
 320
 321         if (acpi_noirq)
 322                 return -ENODEV;
 323
 324         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 325         acpi_irq_penalty_init();
 326         pcibios_enable_irq = acpi_pci_irq_enable;
 327         pcibios_disable_irq = acpi_pci_irq_disable;
 328         x86_init.pci.init_irq = x86_init_noop;
 329
 330         if (pci_routeirq) {
 331                 /*
 332                  * PCI IRQ routing is set up by pci_enable_device(), but we
 333                  * also do it here in case there are still broken drivers that
 334                  * don't use pci_enable_device().
 335                  */
 336                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 337                 for_each_pci_dev(dev)
 338                         acpi_pci_irq_enable(dev);
 339         }
 340
 341         return 0;
 342 }