PCI/ACPI: provide MMCONFIG address for PCI host bridges

This patch provide MMCONFIG address for PCI host bridges, which will
be used to support host bridge hotplug.  It gets MMCONFIG address
by evaluating _CBA method if available.

Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jiang Liu <liuj97@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 7aff6312ce7..ec54014c321 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -505,6 +505,8 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
         device->driver_data = root;
 
+        root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle);
+
         /*
          * All supported architectures that use ACPI have support for
          * PCI domains, so we indicate this in _OSC support capabilities.