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authorJustin Chen <justin.chen@hp.com>2006-12-06 10:17:10 -0700
committerLen Brown <len.brown@intel.com>2007-01-16 16:41:56 -0500
commitd91a0078476ca536d76419f3b53196873b2931bc (patch)
treedc79451e8c7a9518386ace82e35b07bb26fda1df /drivers/acpi/pci_root.c
parenta8b3485287731978899ced11f24628c927890e78 (diff)
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 <justin.chen@hp.com> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/pci_root.c')
-rw-r--r--drivers/acpi/pci_root.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index a860efa2c562..1f06229040ac 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)
{