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 <asm/numa.h>
   7 #include <asm/pci_x86.h>
   8
   9 struct pci_root_info {
  10         struct acpi_device *bridge;
  11         char *name;
  12         unsigned int res_num;
  13         struct resource *res;
  14         struct pci_bus *bus;
  15         int busnum;
  16 };
  17
  18 static acpi_status
  19 resource_to_addr(struct acpi_resource *resource,
  20                         struct acpi_resource_address64 *addr)
  21 {
  22         acpi_status status;
  23
  24         status = acpi_resource_to_address64(resource, addr);
  25         if (ACPI_SUCCESS(status) &&
  26             (addr->resource_type == ACPI_MEMORY_RANGE ||
  27             addr->resource_type == ACPI_IO_RANGE) &&
  28             addr->address_length > 0 &&
  29             addr->producer_consumer == ACPI_PRODUCER) {
  30                 return AE_OK;
  31         }
  32         return AE_ERROR;
  33 }
  34
  35 static acpi_status
  36 count_resource(struct acpi_resource *acpi_res, void *data)
  37 {
  38         struct pci_root_info *info = data;
  39         struct acpi_resource_address64 addr;
  40         acpi_status status;
  41
  42         status = resource_to_addr(acpi_res, &addr);
  43         if (ACPI_SUCCESS(status))
  44                 info->res_num++;
  45         return AE_OK;
  46 }
  47
  48 static int
  49 bus_has_transparent_bridge(struct pci_bus *bus)
  50 {
  51         struct pci_dev *dev;
  52
  53         list_for_each_entry(dev, &bus->devices, bus_list) {
  54                 u16 class = dev->class >> 8;
  55
  56                 if (class == PCI_CLASS_BRIDGE_PCI && dev->transparent)
  57                         return true;
  58         }
  59         return false;
  60 }
  61
  62 static acpi_status
  63 setup_resource(struct acpi_resource *acpi_res, void *data)
  64 {
  65         struct pci_root_info *info = data;
  66         struct resource *res;
  67         struct acpi_resource_address64 addr;
  68         acpi_status status;
  69         unsigned long flags;
  70         struct resource *root;
  71         int max_root_bus_resources = PCI_BUS_NUM_RESOURCES;
  72         u64 start, end;
  73
  74         if (bus_has_transparent_bridge(info->bus))
  75                 max_root_bus_resources -= 3;
  76
  77         status = resource_to_addr(acpi_res, &addr);
  78         if (!ACPI_SUCCESS(status))
  79                 return AE_OK;
  80
  81         if (addr.resource_type == ACPI_MEMORY_RANGE) {
  82                 root = &iomem_resource;
  83                 flags = IORESOURCE_MEM;
  84                 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
  85                         flags |= IORESOURCE_PREFETCH;
  86         } else if (addr.resource_type == ACPI_IO_RANGE) {
  87                 root = &ioport_resource;
  88                 flags = IORESOURCE_IO;
  89         } else
  90                 return AE_OK;
  91
  92         start = addr.minimum + addr.translation_offset;
  93         end = start + addr.address_length - 1;
  94         if (info->res_num >= max_root_bus_resources) {
  95                 if (pci_probe & PCI_USE__CRS)
  96                         printk(KERN_WARNING "PCI: Failed to allocate "
  97                                "0x%lx-0x%lx from %s for %s due to _CRS "
  98                                "returning more than %d resource descriptors\n",
  99                                (unsigned long) start, (unsigned long) end,
 100                                root->name, info->name, max_root_bus_resources);
 101                 return AE_OK;
 102         }
 103
 104         res = &info->res[info->res_num];
 105         res->name = info->name;
 106         res->flags = flags;
 107         res->start = start;
 108         res->end = end;
 109         res->child = NULL;
 110
 111         if (!(pci_probe & PCI_USE__CRS)) {
 112                 dev_printk(KERN_DEBUG, &info->bridge->dev,
 113                            "host bridge window %pR (ignored)\n", res);
 114                 return AE_OK;
 115         }
 116
 117         if (insert_resource(root, res)) {
 118                 dev_err(&info->bridge->dev,
 119                         "can't allocate host bridge window %pR\n", res);
 120         } else {
 121                 info->bus->resource[info->res_num] = res;
 122                 info->res_num++;
 123                 if (addr.translation_offset)
 124                         dev_info(&info->bridge->dev, "host bridge window %pR "
 125                                  "(PCI address [%#llx-%#llx])\n",
 126                                  res, res->start - addr.translation_offset,
 127                                  res->end - addr.translation_offset);
 128                 else
 129                         dev_info(&info->bridge->dev,
 130                                  "host bridge window %pR\n", res);
 131         }
 132         return AE_OK;
 133 }
 134
 135 static void
 136 get_current_resources(struct acpi_device *device, int busnum,
 137                         int domain, struct pci_bus *bus)
 138 {
 139         struct pci_root_info info;
 140         size_t size;
 141
 142         if (!(pci_probe & PCI_USE__CRS))
 143                 dev_info(&device->dev,
 144                          "ignoring host bridge windows from ACPI; "
 145                          "boot with \"pci=use_crs\" to use them\n");
 146
 147         info.bridge = device;
 148         info.bus = bus;
 149         info.res_num = 0;
 150         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
 151                                 &info);
 152         if (!info.res_num)
 153                 return;
 154
 155         size = sizeof(*info.res) * info.res_num;
 156         info.res = kmalloc(size, GFP_KERNEL);
 157         if (!info.res)
 158                 goto res_alloc_fail;
 159
 160         info.name = kmalloc(16, GFP_KERNEL);
 161         if (!info.name)
 162                 goto name_alloc_fail;
 163         sprintf(info.name, "PCI Bus %04x:%02x", domain, busnum);
 164
 165         info.res_num = 0;
 166         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
 167                                 &info);
 168
 169         return;
 170
 171 name_alloc_fail:
 172         kfree(info.res);
 173 res_alloc_fail:
 174         return;
 175 }
 176
 177 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
 178 {
 179         struct pci_bus *bus;
 180         struct pci_sysdata *sd;
 181         int node;
 182 #ifdef CONFIG_ACPI_NUMA
 183         int pxm;
 184 #endif
 185
 186         if (domain && !pci_domains_supported) {
 187                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 188                        "ignored (multiple domains not supported)\n",
 189                        domain, busnum);
 190                 return NULL;
 191         }
 192
 193         node = -1;
 194 #ifdef CONFIG_ACPI_NUMA
 195         pxm = acpi_get_pxm(device->handle);
 196         if (pxm >= 0)
 197                 node = pxm_to_node(pxm);
 198         if (node != -1)
 199                 set_mp_bus_to_node(busnum, node);
 200         else
 201 #endif
 202                 node = get_mp_bus_to_node(busnum);
 203
 204         if (node != -1 && !node_online(node))
 205                 node = -1;
 206
 207         /* Allocate per-root-bus (not per bus) arch-specific data.
 208          * TODO: leak; this memory is never freed.
 209          * It's arguable whether it's worth the trouble to care.
 210          */
 211         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 212         if (!sd) {
 213                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 214                        "ignored (out of memory)\n", domain, busnum);
 215                 return NULL;
 216         }
 217
 218         sd->domain = domain;
 219         sd->node = node;
 220         /*
 221          * Maybe the desired pci bus has been already scanned. In such case
 222          * it is unnecessary to scan the pci bus with the given domain,busnum.
 223          */
 224         bus = pci_find_bus(domain, busnum);
 225         if (bus) {
 226                 /*
 227                  * If the desired bus exits, the content of bus->sysdata will
 228                  * be replaced by sd.
 229                  */
 230                 memcpy(bus->sysdata, sd, sizeof(*sd));
 231                 kfree(sd);
 232         } else {
 233                 bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
 234                 if (bus) {
 235                         get_current_resources(device, busnum, domain, bus);
 236                         bus->subordinate = pci_scan_child_bus(bus);
 237                 }
 238         }
 239
 240         if (!bus)
 241                 kfree(sd);
 242
 243         if (bus && node != -1) {
 244 #ifdef CONFIG_ACPI_NUMA
 245                 if (pxm >= 0)
 246                         dev_printk(KERN_DEBUG, &bus->dev,
 247                                    "on NUMA node %d (pxm %d)\n", node, pxm);
 248 #else
 249                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
 250 #endif
 251         }
 252
 253         return bus;
 254 }
 255
 256 int __init pci_acpi_init(void)
 257 {
 258         struct pci_dev *dev = NULL;
 259
 260         if (pcibios_scanned)
 261                 return 0;
 262
 263         if (acpi_noirq)
 264                 return 0;
 265
 266         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 267         acpi_irq_penalty_init();
 268         pcibios_scanned++;
 269         pcibios_enable_irq = acpi_pci_irq_enable;
 270         pcibios_disable_irq = acpi_pci_irq_disable;
 271
 272         if (pci_routeirq) {
 273                 /*
 274                  * PCI IRQ routing is set up by pci_enable_device(), but we
 275                  * also do it here in case there are still broken drivers that
 276                  * don't use pci_enable_device().
 277                  */
 278                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 279                 for_each_pci_dev(dev)
 280                         acpi_pci_irq_enable(dev);
 281         }
 282
 283         return 0;
 284 }