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         {}
  38 };
  39
  40 void __init pci_acpi_crs_quirks(void)
  41 {
  42         int year;
  43
  44         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
  45                 pci_use_crs = false;
  46
  47         dmi_check_system(pci_use_crs_table);
  48
  49         /*
  50          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
  51          * takes precedence over anything we figured out above.
  52          */
  53         if (pci_probe & PCI_ROOT_NO_CRS)
  54                 pci_use_crs = false;
  55         else if (pci_probe & PCI_USE__CRS)
  56                 pci_use_crs = true;
  57
  58         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
  59                "if necessary, use \"pci=%s\" and report a bug\n",
  60                pci_use_crs ? "Using" : "Ignoring",
  61                pci_use_crs ? "nocrs" : "use_crs");
  62 }
  63
  64 static acpi_status
  65 resource_to_addr(struct acpi_resource *resource,
  66                         struct acpi_resource_address64 *addr)
  67 {
  68         acpi_status status;
  69         struct acpi_resource_memory24 *memory24;
  70         struct acpi_resource_memory32 *memory32;
  71         struct acpi_resource_fixed_memory32 *fixed_memory32;
  72
  73         memset(addr, 0, sizeof(*addr));
  74         switch (resource->type) {
  75         case ACPI_RESOURCE_TYPE_MEMORY24:
  76                 memory24 = &resource->data.memory24;
  77                 addr->resource_type = ACPI_MEMORY_RANGE;
  78                 addr->minimum = memory24->minimum;
  79                 addr->address_length = memory24->address_length;
  80                 addr->maximum = addr->minimum + addr->address_length - 1;
  81                 return AE_OK;
  82         case ACPI_RESOURCE_TYPE_MEMORY32:
  83                 memory32 = &resource->data.memory32;
  84                 addr->resource_type = ACPI_MEMORY_RANGE;
  85                 addr->minimum = memory32->minimum;
  86                 addr->address_length = memory32->address_length;
  87                 addr->maximum = addr->minimum + addr->address_length - 1;
  88                 return AE_OK;
  89         case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
  90                 fixed_memory32 = &resource->data.fixed_memory32;
  91                 addr->resource_type = ACPI_MEMORY_RANGE;
  92                 addr->minimum = fixed_memory32->address;
  93                 addr->address_length = fixed_memory32->address_length;
  94                 addr->maximum = addr->minimum + addr->address_length - 1;
  95                 return AE_OK;
  96         case ACPI_RESOURCE_TYPE_ADDRESS16:
  97         case ACPI_RESOURCE_TYPE_ADDRESS32:
  98         case ACPI_RESOURCE_TYPE_ADDRESS64:
  99                 status = acpi_resource_to_address64(resource, addr);
 100                 if (ACPI_SUCCESS(status) &&
 101                     (addr->resource_type == ACPI_MEMORY_RANGE ||
 102                     addr->resource_type == ACPI_IO_RANGE) &&
 103                     addr->address_length > 0) {
 104                         return AE_OK;
 105                 }
 106                 break;
 107         }
 108         return AE_ERROR;
 109 }
 110
 111 static acpi_status
 112 count_resource(struct acpi_resource *acpi_res, void *data)
 113 {
 114         struct pci_root_info *info = data;
 115         struct acpi_resource_address64 addr;
 116         acpi_status status;
 117
 118         status = resource_to_addr(acpi_res, &addr);
 119         if (ACPI_SUCCESS(status))
 120                 info->res_num++;
 121         return AE_OK;
 122 }
 123
 124 static acpi_status
 125 setup_resource(struct acpi_resource *acpi_res, void *data)
 126 {
 127         struct pci_root_info *info = data;
 128         struct resource *res;
 129         struct acpi_resource_address64 addr;
 130         acpi_status status;
 131         unsigned long flags;
 132         struct resource *root, *conflict;
 133         u64 start, end;
 134
 135         status = resource_to_addr(acpi_res, &addr);
 136         if (!ACPI_SUCCESS(status))
 137                 return AE_OK;
 138
 139         if (addr.resource_type == ACPI_MEMORY_RANGE) {
 140                 root = &iomem_resource;
 141                 flags = IORESOURCE_MEM;
 142                 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
 143                         flags |= IORESOURCE_PREFETCH;
 144         } else if (addr.resource_type == ACPI_IO_RANGE) {
 145                 root = &ioport_resource;
 146                 flags = IORESOURCE_IO;
 147         } else
 148                 return AE_OK;
 149
 150         start = addr.minimum + addr.translation_offset;
 151         end = addr.maximum + addr.translation_offset;
 152
 153         res = &info->res[info->res_num];
 154         res->name = info->name;
 155         res->flags = flags;
 156         res->start = start;
 157         res->end = end;
 158         res->child = NULL;
 159
 160         if (!pci_use_crs) {
 161                 dev_printk(KERN_DEBUG, &info->bridge->dev,
 162                            "host bridge window %pR (ignored)\n", res);
 163                 return AE_OK;
 164         }
 165
 166         conflict = insert_resource_conflict(root, res);
 167         if (conflict) {
 168                 dev_err(&info->bridge->dev,
 169                         "address space collision: host bridge window %pR "
 170                         "conflicts with %s %pR\n",
 171                         res, conflict->name, conflict);
 172         } else {
 173                 pci_bus_add_resource(info->bus, res, 0);
 174                 info->res_num++;
 175                 if (addr.translation_offset)
 176                         dev_info(&info->bridge->dev, "host bridge window %pR "
 177                                  "(PCI address [%#llx-%#llx])\n",
 178                                  res, res->start - addr.translation_offset,
 179                                  res->end - addr.translation_offset);
 180                 else
 181                         dev_info(&info->bridge->dev,
 182                                  "host bridge window %pR\n", res);
 183         }
 184         return AE_OK;
 185 }
 186
 187 static void
 188 get_current_resources(struct acpi_device *device, int busnum,
 189                         int domain, struct pci_bus *bus)
 190 {
 191         struct pci_root_info info;
 192         size_t size;
 193
 194         if (pci_use_crs)
 195                 pci_bus_remove_resources(bus);
 196
 197         info.bridge = device;
 198         info.bus = bus;
 199         info.res_num = 0;
 200         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
 201                                 &info);
 202         if (!info.res_num)
 203                 return;
 204
 205         size = sizeof(*info.res) * info.res_num;
 206         info.res = kmalloc(size, GFP_KERNEL);
 207         if (!info.res)
 208                 goto res_alloc_fail;
 209
 210         info.name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum);
 211         if (!info.name)
 212                 goto name_alloc_fail;
 213
 214         info.res_num = 0;
 215         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
 216                                 &info);
 217
 218         return;
 219
 220 name_alloc_fail:
 221         kfree(info.res);
 222 res_alloc_fail:
 223         return;
 224 }
 225
 226 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
 227 {
 228         struct acpi_device *device = root->device;
 229         int domain = root->segment;
 230         int busnum = root->secondary.start;
 231         struct pci_bus *bus;
 232         struct pci_sysdata *sd;
 233         int node;
 234 #ifdef CONFIG_ACPI_NUMA
 235         int pxm;
 236 #endif
 237
 238         if (domain && !pci_domains_supported) {
 239                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 240                        "ignored (multiple domains not supported)\n",
 241                        domain, busnum);
 242                 return NULL;
 243         }
 244
 245         node = -1;
 246 #ifdef CONFIG_ACPI_NUMA
 247         pxm = acpi_get_pxm(device->handle);
 248         if (pxm >= 0)
 249                 node = pxm_to_node(pxm);
 250         if (node != -1)
 251                 set_mp_bus_to_node(busnum, node);
 252         else
 253 #endif
 254                 node = get_mp_bus_to_node(busnum);
 255
 256         if (node != -1 && !node_online(node))
 257                 node = -1;
 258
 259         /* Allocate per-root-bus (not per bus) arch-specific data.
 260          * TODO: leak; this memory is never freed.
 261          * It's arguable whether it's worth the trouble to care.
 262          */
 263         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 264         if (!sd) {
 265                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 266                        "ignored (out of memory)\n", domain, busnum);
 267                 return NULL;
 268         }
 269
 270         sd->domain = domain;
 271         sd->node = node;
 272         /*
 273          * Maybe the desired pci bus has been already scanned. In such case
 274          * it is unnecessary to scan the pci bus with the given domain,busnum.
 275          */
 276         bus = pci_find_bus(domain, busnum);
 277         if (bus) {
 278                 /*
 279                  * If the desired bus exits, the content of bus->sysdata will
 280                  * be replaced by sd.
 281                  */
 282                 memcpy(bus->sysdata, sd, sizeof(*sd));
 283                 kfree(sd);
 284         } else {
 285                 bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
 286                 if (bus) {
 287                         get_current_resources(device, busnum, domain, bus);
 288                         bus->subordinate = pci_scan_child_bus(bus);
 289                 }
 290         }
 291
 292         if (!bus)
 293                 kfree(sd);
 294
 295         if (bus && node != -1) {
 296 #ifdef CONFIG_ACPI_NUMA
 297                 if (pxm >= 0)
 298                         dev_printk(KERN_DEBUG, &bus->dev,
 299                                    "on NUMA node %d (pxm %d)\n", node, pxm);
 300 #else
 301                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
 302 #endif
 303         }
 304
 305         return bus;
 306 }
 307
 308 int __init pci_acpi_init(void)
 309 {
 310         struct pci_dev *dev = NULL;
 311
 312         if (acpi_noirq)
 313                 return -ENODEV;
 314
 315         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 316         acpi_irq_penalty_init();
 317         pcibios_enable_irq = acpi_pci_irq_enable;
 318         pcibios_disable_irq = acpi_pci_irq_disable;
 319         x86_init.pci.init_irq = x86_init_noop;
 320
 321         if (pci_routeirq) {
 322                 /*
 323                  * PCI IRQ routing is set up by pci_enable_device(), but we
 324                  * also do it here in case there are still broken drivers that
 325                  * don't use pci_enable_device().
 326                  */
 327                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 328                 for_each_pci_dev(dev)
 329                         acpi_pci_irq_enable(dev);
 330         }
 331
 332         return 0;
 333 }