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(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[] = {
  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_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
  49 {
  50         struct pci_bus *bus;
  51         struct pci_sysdata *sd;
  52         int pxm;
  53
  54         dmi_check_system(acpi_pciprobe_dmi_table);
  55
  56         /* Allocate per-root-bus (not per bus) arch-specific data.
  57          * TODO: leak; this memory is never freed.
  58          * It's arguable whether it's worth the trouble to care.
  59          */
  60         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
  61         if (!sd) {
  62                 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
  63                 return NULL;
  64         }
  65
  66         if (domain != 0) {
  67                 printk(KERN_WARNING "PCI: Multiple domains not supported\n");
  68                 kfree(sd);
  69                 return NULL;
  70         }
  71
  72         sd->node = -1;
  73
  74         pxm = acpi_get_pxm(device->handle);
  75 #ifdef CONFIG_ACPI_NUMA
  76         if (pxm >= 0)
  77                 sd->node = pxm_to_node(pxm);
  78 #endif
  79
  80         bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
  81         if (!bus)
  82                 kfree(sd);
  83
  84 #ifdef CONFIG_ACPI_NUMA
  85         if (bus != NULL) {
  86                 if (pxm >= 0) {
  87                         printk("bus %d -> pxm %d -> node %d\n",
  88                                 busnum, pxm, sd->node);
  89                 }
  90         }
  91 #endif
  92
  93         return bus;
  94 }
  95
  96 extern int pci_routeirq;
  97 static int __init pci_acpi_init(void)
  98 {
  99         struct pci_dev *dev = NULL;
 100
 101         if (pcibios_scanned)
 102                 return 0;
 103
 104         if (acpi_noirq)
 105                 return 0;
 106
 107         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 108         acpi_irq_penalty_init();
 109         pcibios_scanned++;
 110         pcibios_enable_irq = acpi_pci_irq_enable;
 111         pcibios_disable_irq = acpi_pci_irq_disable;
 112
 113         if (pci_routeirq) {
 114                 /*
 115                  * PCI IRQ routing is set up by pci_enable_device(), but we
 116                  * also do it here in case there are still broken drivers that
 117                  * don't use pci_enable_device().
 118                  */
 119                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 120                 for_each_pci_dev(dev)
 121                         acpi_pci_irq_enable(dev);
 122         } else
 123                 printk(KERN_INFO "PCI: If a device doesn't work, try \"pci=routeirq\".  If it helps, post a report\n");
 124
 125 #ifdef CONFIG_X86_IO_APIC
 126         if (acpi_ioapic)
 127                 print_IO_APIC();
 128 #endif
 129
 130         return 0;
 131 }
 132 subsys_initcall(pci_acpi_init);