ACPI/PCI: PCI extended config _OSC support called when root bridge added
The _OSC capability OSC_EXT_PCI_CONFIG_SUPPORT is set when the root
bridge is added with pci_acpi_osc_support() if we can access PCI
extended config space.
This adds the function pci_ext_cfg_avail which returns true if we can
access PCI extended config space (offset greater than 0xff). It
currently only returns false if arch=x86 and raw_pci_ext_ops is not set
(which might happen if pci=nommcfg is set on the kernel command-line).
Signed-off-by: Andrew Patterson <andrew.patterson@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index de4d571..96e68e8 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -194,7 +194,7 @@
unsigned long long value = 0;
acpi_handle handle = NULL;
struct acpi_device *child;
- u32 flags;
+ u32 flags, base_flags;
if (!device)
@@ -216,7 +216,7 @@
* All supported architectures that use ACPI have support for
* PCI domains, so we indicate this in _OSC support capabilities.
*/
- flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
+ flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
pci_acpi_osc_support(device->handle, flags);
/*
@@ -344,6 +344,12 @@
list_for_each_entry(child, &device->children, node)
acpi_pci_bridge_scan(child);
+ /* Indicate support for various _OSC capabilities. */
+ if (pci_ext_cfg_avail(root->bus->self))
+ flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
+ if (flags != base_flags)
+ pci_acpi_osc_support(device->handle, flags);
+
end:
if (result) {
if (!list_empty(&root->node))