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/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 62ddb73..9ab8509 100644 (file)
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -562,6 +562,14 @@ 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 de4d571..96e68e8 100644 (file)
--- 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 3c2fa2f..48fa860 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2084,6 +2084,19 @@ 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 4bb156b..6fd4765 100644 (file)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1140,6 +1140,8 @@ 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 __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
 {