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 "pci.h"
   8
   9 static int __devinit can_skip_ioresource_align(const struct dmi_system_id *d)
  10 {
  11         pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
  12         printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
  13         return 0;
  14 }
  15
  16 static struct dmi_system_id acpi_pciprobe_dmi_table[] __devinitdata = {
  17 /*
  18  * Systems where PCI IO resource ISA alignment can be skipped
  19  * when the ISA enable bit in the bridge control is not set
  20  */
  21         {
  22                 .callback = can_skip_ioresource_align,
  23                 .ident = "IBM System x3800",
  24                 .matches = {
  25                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
  26                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
  27                 },
  28         },
  29         {
  30                 .callback = can_skip_ioresource_align,
  31                 .ident = "IBM System x3850",
  32                 .matches = {
  33                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
  34                         DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
  35                 },
  36         },
  37         {
  38                 .callback = can_skip_ioresource_align,
  39                 .ident = "IBM System x3950",
  40                 .matches = {
  41                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
  42                         DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
  43                 },
  44         },
  45         {}
  46 };
  47
  48 struct pci_root_info {
  49         char *name;
  50         unsigned int res_num;
  51         struct resource *res;
  52         struct pci_bus *bus;
  53         int busnum;
  54 };
  55
  56 static acpi_status
  57 resource_to_addr(struct acpi_resource *resource,
  58                         struct acpi_resource_address64 *addr)
  59 {
  60         acpi_status status;
  61
  62         status = acpi_resource_to_address64(resource, addr);
  63         if (ACPI_SUCCESS(status) &&
  64             (addr->resource_type == ACPI_MEMORY_RANGE ||
  65             addr->resource_type == ACPI_IO_RANGE) &&
  66             addr->address_length > 0 &&
  67             addr->producer_consumer == ACPI_PRODUCER) {
  68                 return AE_OK;
  69         }
  70         return AE_ERROR;
  71 }
  72
  73 static acpi_status
  74 count_resource(struct acpi_resource *acpi_res, void *data)
  75 {
  76         struct pci_root_info *info = data;
  77         struct acpi_resource_address64 addr;
  78         acpi_status status;
  79
  80         if (info->res_num >= PCI_BUS_NUM_RESOURCES)
  81                 return AE_OK;
  82
  83         status = resource_to_addr(acpi_res, &addr);
  84         if (ACPI_SUCCESS(status))
  85                 info->res_num++;
  86         return AE_OK;
  87 }
  88
  89 static acpi_status
  90 setup_resource(struct acpi_resource *acpi_res, void *data)
  91 {
  92         struct pci_root_info *info = data;
  93         struct resource *res;
  94         struct acpi_resource_address64 addr;
  95         acpi_status status;
  96         unsigned long flags;
  97         struct resource *root;
  98
  99         if (info->res_num >= PCI_BUS_NUM_RESOURCES)
 100                 return AE_OK;
 101
 102         status = resource_to_addr(acpi_res, &addr);
 103         if (!ACPI_SUCCESS(status))
 104                 return AE_OK;
 105
 106         if (addr.resource_type == ACPI_MEMORY_RANGE) {
 107                 root = &iomem_resource;
 108                 flags = IORESOURCE_MEM;
 109                 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
 110                         flags |= IORESOURCE_PREFETCH;
 111         } else if (addr.resource_type == ACPI_IO_RANGE) {
 112                 root = &ioport_resource;
 113                 flags = IORESOURCE_IO;
 114         } else
 115                 return AE_OK;
 116
 117         res = &info->res[info->res_num];
 118         res->name = info->name;
 119         res->flags = flags;
 120         res->start = addr.minimum + addr.translation_offset;
 121         res->end = res->start + addr.address_length - 1;
 122         res->child = NULL;
 123
 124         if (insert_resource(root, res)) {
 125                 printk(KERN_ERR "PCI: Failed to allocate 0x%lx-0x%lx "
 126                         "from %s for %s\n", (unsigned long) res->start,
 127                         (unsigned long) res->end, root->name, info->name);
 128         } else {
 129                 info->bus->resource[info->res_num] = res;
 130                 info->res_num++;
 131         }
 132         return AE_OK;
 133 }
 134
 135 static void
 136 adjust_transparent_bridge_resources(struct pci_bus *bus)
 137 {
 138         struct pci_dev *dev;
 139
 140         list_for_each_entry(dev, &bus->devices, bus_list) {
 141                 int i;
 142                 u16 class = dev->class >> 8;
 143
 144                 if (class == PCI_CLASS_BRIDGE_PCI && dev->transparent) {
 145                         for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
 146                                 dev->subordinate->resource[i] =
 147                                                 dev->bus->resource[i - 3];
 148                 }
 149         }
 150 }
 151
 152 static void
 153 get_current_resources(struct acpi_device *device, int busnum,
 154                         struct pci_bus *bus)
 155 {
 156         struct pci_root_info info;
 157         size_t size;
 158
 159         info.bus = bus;
 160         info.res_num = 0;
 161         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
 162                                 &info);
 163         if (!info.res_num)
 164                 return;
 165
 166         size = sizeof(*info.res) * info.res_num;
 167         info.res = kmalloc(size, GFP_KERNEL);
 168         if (!info.res)
 169                 goto res_alloc_fail;
 170
 171         info.name = kmalloc(12, GFP_KERNEL);
 172         if (!info.name)
 173                 goto name_alloc_fail;
 174         sprintf(info.name, "PCI Bus #%02x", busnum);
 175
 176         info.res_num = 0;
 177         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
 178                                 &info);
 179         if (info.res_num)
 180                 adjust_transparent_bridge_resources(bus);
 181
 182         return;
 183
 184 name_alloc_fail:
 185         kfree(info.res);
 186 res_alloc_fail:
 187         return;
 188 }
 189
 190 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
 191 {
 192         struct pci_bus *bus;
 193         struct pci_sysdata *sd;
 194         int pxm;
 195
 196         dmi_check_system(acpi_pciprobe_dmi_table);
 197
 198         if (domain && !pci_domains_supported) {
 199                 printk(KERN_WARNING "PCI: Multiple domains not supported "
 200                        "(dom %d, bus %d)\n", domain, busnum);
 201                 return NULL;
 202         }
 203
 204         /* Allocate per-root-bus (not per bus) arch-specific data.
 205          * TODO: leak; this memory is never freed.
 206          * It's arguable whether it's worth the trouble to care.
 207          */
 208         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 209         if (!sd) {
 210                 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
 211                 return NULL;
 212         }
 213
 214         sd->domain = domain;
 215         sd->node = -1;
 216
 217         pxm = acpi_get_pxm(device->handle);
 218 #ifdef CONFIG_ACPI_NUMA
 219         if (pxm >= 0)
 220                 sd->node = pxm_to_node(pxm);
 221 #endif
 222         /*
 223          * Maybe the desired pci bus has been already scanned. In such case
 224          * it is unnecessary to scan the pci bus with the given domain,busnum.
 225          */
 226         bus = pci_find_bus(domain, busnum);
 227         if (bus) {
 228                 /*
 229                  * If the desired bus exits, the content of bus->sysdata will
 230                  * be replaced by sd.
 231                  */
 232                 memcpy(bus->sysdata, sd, sizeof(*sd));
 233                 kfree(sd);
 234         } else
 235                 bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
 236
 237         if (!bus)
 238                 kfree(sd);
 239
 240 #ifdef CONFIG_ACPI_NUMA
 241         if (bus != NULL) {
 242                 if (pxm >= 0) {
 243                         printk("bus %d -> pxm %d -> node %d\n",
 244                                 busnum, pxm, pxm_to_node(pxm));
 245                 }
 246         }
 247 #endif
 248
 249         if (bus && (pci_probe & PCI_USE__CRS))
 250                 get_current_resources(device, busnum, bus);
 251
 252         return bus;
 253 }
 254
 255 extern int pci_routeirq;
 256 static 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         } else
 282                 printk(KERN_INFO "PCI: If a device doesn't work, try \"pci=routeirq\".  If it helps, post a report\n");
 283
 284 #ifdef CONFIG_X86_IO_APIC
 285         if (acpi_ioapic)
 286                 print_IO_APIC();
 287 #endif
 288
 289         return 0;
 290 }
 291 subsys_initcall(pci_acpi_init);