diff options
| author | Jiang Liu <jiang.liu@huawei.com> | 2012-06-22 14:55:16 +0800 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2012-06-22 15:16:51 -0600 |
| commit | f4b57a3b4352f72e461e362cb25917e28bdba80f (patch) | |
| tree | 645b4c86120578cae02e0e4065ba2b39d77bb539 /drivers | |
| parent | 9c95111b330d2ddf851444528a7608f267cbb50c (diff) | |
| download | linux-f4b57a3b4352f72e461e362cb25917e28bdba80f.tar.bz2 | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/pci_root.c | 2 | ||||
| -rw-r--r-- | drivers/pci/pci-acpi.c | 14 |
2 files changed, 16 insertions, 0 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 7aff6312ce7c..ec54014c321c 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. diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index 61e2fefeedab..87f4c504eafb 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -162,6 +162,20 @@ acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) return remove_pm_notifier(dev, pci_acpi_wake_dev); } +phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle) +{ + acpi_status status = AE_NOT_EXIST; + unsigned long long mcfg_addr; + + if (handle) + status = acpi_evaluate_integer(handle, METHOD_NAME__CBA, + NULL, &mcfg_addr); + if (ACPI_FAILURE(status)) + return 0; + + return (phys_addr_t)mcfg_addr; +} + /* * _SxD returns the D-state with the highest power * (lowest D-state number) supported in the S-state "x". |