1 files changed, 90 insertions, 0 deletions
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
new file mode 100644
index 00000000000..bc8a44bddaa
--- /dev/null
+++ b/arch/x86/pci/acpi.c
@@ -0,0 +1,90 @@
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <asm/numa.h>
+#include "pci.h"
+
+struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
+{
+	struct pci_bus *bus;
+	struct pci_sysdata *sd;
+	int pxm;
+
+	/* Allocate per-root-bus (not per bus) arch-specific data.
+	 * TODO: leak; this memory is never freed.
+	 * It's arguable whether it's worth the trouble to care.
+	 */
+	sd = kzalloc(sizeof(*sd), GFP_KERNEL);
+	if (!sd) {
+		printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
+		return NULL;
+	}
+
+	if (domain != 0) {
+		printk(KERN_WARNING "PCI: Multiple domains not supported\n");
+		kfree(sd);
+		return NULL;
+	}
+
+	sd->node = -1;
+
+	pxm = acpi_get_pxm(device->handle);
+#ifdef CONFIG_ACPI_NUMA
+	if (pxm >= 0)
+		sd->node = pxm_to_node(pxm);
+#endif
+
+	bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
+	if (!bus)
+		kfree(sd);
+
+#ifdef CONFIG_ACPI_NUMA
+	if (bus != NULL) {
+		if (pxm >= 0) {
+			printk("bus %d -> pxm %d -> node %d\n",
+				busnum, pxm, sd->node);
+		}
+	}
+#endif
+	
+	return bus;
+}
+
+extern int pci_routeirq;
+static int __init pci_acpi_init(void)
+{
+	struct pci_dev *dev = NULL;
+
+	if (pcibios_scanned)
+		return 0;
+
+	if (acpi_noirq)
+		return 0;
+
+	printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
+	acpi_irq_penalty_init();
+	pcibios_scanned++;
+	pcibios_enable_irq = acpi_pci_irq_enable;
+	pcibios_disable_irq = acpi_pci_irq_disable;
+
+	if (pci_routeirq) {
+		/*
+		 * PCI IRQ routing is set up by pci_enable_device(), but we
+		 * also do it here in case there are still broken drivers that
+		 * don't use pci_enable_device().
+		 */
+		printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
+		for_each_pci_dev(dev)
+			acpi_pci_irq_enable(dev);
+	} else
+		printk(KERN_INFO "PCI: If a device doesn't work, try \"pci=routeirq\".  If it helps, post a report\n");
+
+#ifdef CONFIG_X86_IO_APIC
+	if (acpi_ioapic)
+		print_IO_APIC();
+#endif
+
+	return 0;
+}
+subsys_initcall(pci_acpi_init);