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ACPI/PCI: PCI extended config _OSC support called when root bridge added

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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 <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>
This commit is contained in:
Andrew Patterson 2008-11-10 15:30:50 -07:00 • committed by Jesse Barnes
commit 0ef5f8f615
4 changed files with 31 additions and 2 deletions
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10
drivers/acpi/pci_root.c
View file

@ -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))