arch/i386/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 <asm/numa.h>
   6 #include "pci.h"
   7
   8 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
   9 {
  10         struct pci_bus *bus;
  11         struct pci_sysdata *sd;
  12         int pxm;
  13
  14         /* Allocate per-root-bus (not per bus) arch-specific data.
  15          * TODO: leak; this memory is never freed.
  16          * It's arguable whether it's worth the trouble to care.
  17          */
  18         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
  19         if (!sd) {
  20                 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
  21                 return NULL;
  22         }
  23
  24         if (domain != 0) {
  25                 printk(KERN_WARNING "PCI: Multiple domains not supported\n");
  26                 kfree(sd);
  27                 return NULL;
  28         }
  29
  30         sd->node = -1;
  31
  32         pxm = acpi_get_pxm(device->handle);
  33 #ifdef CONFIG_ACPI_NUMA
  34         if (pxm >= 0)
  35                 sd->node = pxm_to_node(pxm);
  36 #endif
  37
  38         bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
  39         if (!bus)
  40                 kfree(sd);
  41
  42 #ifdef CONFIG_ACPI_NUMA
  43         if (bus != NULL) {
  44                 if (pxm >= 0) {
  45                         printk("bus %d -> pxm %d -> node %d\n",
  46                                 busnum, pxm, sd->node);
  47                 }
  48         }
  49 #endif
  50
  51         return bus;
  52 }
  53
  54 extern int pci_routeirq;
  55 static int __init pci_acpi_init(void)
  56 {
  57         struct pci_dev *dev = NULL;
  58
  59         if (pcibios_scanned)
  60                 return 0;
  61
  62         if (acpi_noirq)
  63                 return 0;
  64
  65         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
  66         acpi_irq_penalty_init();
  67         pcibios_scanned++;
  68         pcibios_enable_irq = acpi_pci_irq_enable;
  69         pcibios_disable_irq = acpi_pci_irq_disable;
  70
  71         if (pci_routeirq) {
  72                 /*
  73                  * PCI IRQ routing is set up by pci_enable_device(), but we
  74                  * also do it here in case there are still broken drivers that
  75                  * don't use pci_enable_device().
  76                  */
  77                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
  78                 for_each_pci_dev(dev)
  79                         acpi_pci_irq_enable(dev);
  80         } else
  81                 printk(KERN_INFO "PCI: If a device doesn't work, try \"pci=routeirq\".  If it helps, post a report\n");
  82
  83 #ifdef CONFIG_X86_IO_APIC
  84         if (acpi_ioapic)
  85                 print_IO_APIC();
  86 #endif
  87
  88         return 0;
  89 }
  90 subsys_initcall(pci_acpi_init);