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.

Added 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
---

diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index b67732b..bf017bb 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -546,6 +546,14 @@ void pcibios_disable_device (struct pci_dev *dev)
pcibios_disable_irq(dev);
}

+int pci_ext_cfg_avail(struct pci_dev *dev)
+{
+ if (raw_pci_ext_ops)
+ return 1;
+ else
+ return 0;
+}
+
struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
{
struct pci_bus *bus = NULL;
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 7ca153e..191a510 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -194,7 +194,7 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
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 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
* 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 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
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))
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 21f2ac6..70a8c74 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2029,6 +2029,19 @@ static void __devinit pci_no_domains(void)
#endif
}

+/**
+ * pci_ext_cfg_enabled - can we access extended PCI config space?
+ * @dev: The PCI device of the root bridge.
+ *
+ * Returns 1 if we can access PCI extended config space (offsets
+ * greater than 0xff). This is the default implementation. Architecture
+ * implementations can override this.
+ */
+int __attribute__ ((weak)) pci_ext_cfg_avail(struct pci_dev *dev)
+{
+ return 1;
+}
+
static int __devinit pci_init(void)
{
struct pci_dev *dev = NULL;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c75b82b..c5d40ba 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1135,6 +1135,8 @@ static inline void pci_mmcfg_early_init(void) { }
static inline void pci_mmcfg_late_init(void) { }
#endif

+int pci_ext_cfg_avail(struct pci_dev *dev);
+
#ifdef CONFIG_HAS_IOMEM
static inline void * pci_ioremap_bar(struct pci_dev *pdev, int bar)
{

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