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authorAndrew Patterson <andrew.patterson@hp.com>2008-11-11 01:30:45 +0300
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-01-07 22:12:27 +0300
commit990a7ac5645883a833a11b900bb6f25b65dea65b (patch)
tree8644b7da9b41069d873d2b4dbe600bc5a828347d
parent8b62091e20215730be1b94b7cd135a78a3e692ca (diff)
downloadlinux-990a7ac5645883a833a11b900bb6f25b65dea65b.tar.xz
ACPI/PCI: call _OSC support during root bridge discovery
Add pci_acpi_osc_support() and call it when a PCI bridge is added. This allows us to avoid having every individual PCI root bridge driver call _OSC support for every root bridge in their probe functions, a significant savings in boot time. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
-rw-r--r--drivers/acpi/pci_root.c9
-rw-r--r--drivers/pci/pci-acpi.c24
-rw-r--r--include/linux/pci-acpi.h1
3 files changed, 29 insertions, 5 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 642554b1b60c..de4d57114fe4 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -31,6 +31,7 @@
#include <linux/spinlock.h>
#include <linux/pm.h>
#include <linux/pci.h>
+#include <linux/pci-acpi.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
@@ -193,6 +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;
if (!device)
@@ -210,6 +212,13 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
device->ops.bind = acpi_pci_bind;
+ /*
+ * 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;
+ pci_acpi_osc_support(device->handle, flags);
+
/*
* Segment
* -------
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 2ed3f10d0860..8a1f02c3c915 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -143,28 +143,42 @@ static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data,
return status;
}
-static acpi_status acpi_query_osc(acpi_handle handle,
- u32 level, void *context, void **retval)
+/*
+ * pci_acpi_osc_support: Invoke _OSC indicating support for the given feature
+ * @flags: Bitmask of flags to support
+ *
+ * See the ACPI spec for the definition of the flags
+ */
+int pci_acpi_osc_support(acpi_handle handle, u32 flags)
{
+ u32 dummy;
acpi_status status;
- struct acpi_osc_data *osc_data;
- u32 flags = (unsigned long)context, dummy;
acpi_handle tmp;
+ struct acpi_osc_data *osc_data;
+ int rc = 0;
status = acpi_get_handle(handle, "_OSC", &tmp);
if (ACPI_FAILURE(status))
- return AE_OK;
+ return -ENOTTY;
mutex_lock(&pci_acpi_lock);
osc_data = acpi_get_osc_data(handle);
if (!osc_data) {
printk(KERN_ERR "acpi osc data array is full\n");
+ rc = -ENOMEM;
goto out;
}
__acpi_query_osc(flags, osc_data, &dummy);
out:
mutex_unlock(&pci_acpi_lock);
+ return rc;
+}
+
+static acpi_status acpi_query_osc(acpi_handle handle, u32 level,
+ void *context, void **retval)
+{
+ pci_acpi_osc_support(handle, (unsigned long)context);
return AE_OK;
}
diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
index a9e4c34e9389..424f06f84cab 100644
--- a/include/linux/pci-acpi.h
+++ b/include/linux/pci-acpi.h
@@ -51,6 +51,7 @@
#ifdef CONFIG_ACPI
extern acpi_status pci_osc_control_set(acpi_handle handle, u32 flags);
extern acpi_status __pci_osc_support_set(u32 flags, const char *hid);
+int pci_acpi_osc_support(acpi_handle handle, u32 flags);
static inline acpi_status pci_osc_support_set(u32 flags)
{
return __pci_osc_support_set(flags, PCI_ROOT_HID_STRING);