diff options
| author | Andrew Patterson <andrew.patterson@hp.com> | 2008-11-10 15:30:50 -0700 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-01-07 11:12:28 -0800 |
| commit | 0ef5f8f6159e44b4faa997be08d1a3bcbf44ad08 (patch) | |
| tree | 0753c27a1eb2f5802501e60d575f01fe6edccc2f | |
| parent | 990a7ac5645883a833a11b900bb6f25b65dea65b (diff) | |
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>
| -rw-r--r-- | arch/x86/pci/common.c | 8 | ||||
| -rw-r--r-- | drivers/acpi/pci_root.c | 10 | ||||
| -rw-r--r-- | drivers/pci/pci.c | 13 | ||||
| -rw-r--r-- | include/linux/pci.h | 2 |
4 files changed, 31 insertions, 2 deletions
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c index 62ddb73e09e..9ab8509f7b1 100644 --- 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 de4d57114fe..96e68e84153 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 3c2fa2fdc9c..48fa860276d 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; diff --git a/include/linux/pci.h b/include/linux/pci.h index 4bb156ba854..6fd47654ca4 100644 --- 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) { |