From d91a0078476ca536d76419f3b53196873b2931bc Mon Sep 17 00:00:00 2001 From: Justin Chen Date: Wed, 6 Dec 2006 10:17:10 -0700 Subject: ACPI: Optimize acpi_get_pci_rootbridge_handle() to boot faster Move acpi_get_pci_rootbridge_handle() from glue.c to pci_root.c and get the root bridge ACPI handles by searching the &acpi_pci_roots list instead of walking through the ACPI name space. This significantly reduces boot time on large I/O systems. Signed-off-by: Justin Chen Signed-off-by: Bjorn Helgaas Signed-off-by: Len Brown --- drivers/acpi/pci_root.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'drivers/acpi/pci_root.c') diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index a860efa2c56..1f06229040a 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -117,6 +117,19 @@ void acpi_pci_unregister_driver(struct acpi_pci_driver *driver) EXPORT_SYMBOL(acpi_pci_unregister_driver); +acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus) +{ + struct acpi_pci_root *tmp; + + list_for_each_entry(tmp, &acpi_pci_roots, node) { + if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus)) + return tmp->device->handle; + } + return NULL; +} + +EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle); + static acpi_status get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) { -- cgit v1.2.3-70-g09d2