diff options
| author | Andrew Patterson <andrew.patterson@hp.com> | 2008-11-10 23:30:50 +0100 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-01-07 20:12:28 +0100 |
| commit | 0ef5f8f6159e44b4faa997be08d1a3bcbf44ad08 (patch) | |
| tree | 0753c27a1eb2f5802501e60d575f01fe6edccc2f /drivers | |
| parent | ACPI/PCI: call _OSC support during root bridge discovery (diff) | |
| download | linux-0ef5f8f6159e44b4faa997be08d1a3bcbf44ad08.tar.xz linux-0ef5f8f6159e44b4faa997be08d1a3bcbf44ad08.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/pci_root.c | 10 | ||||
| -rw-r--r-- | drivers/pci/pci.c | 13 |
2 files changed, 21 insertions, 2 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index de4d57114fe4..96e68e841539 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 3c2fa2fdc9cd..48fa860276d4 100644 --- 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; |