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ACPI/PCI: call _OSC support during root bridge discovery

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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>
This commit is contained in:
Andrew Patterson 2008-11-10 15:30:45 -07:00 committed by Jesse Barnes
parent 8b62091e20
commit 990a7ac564
3 changed files with 29 additions and 5 deletions
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9
drivers/acpi/pci_root.c
View file

@ -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
* -------

24
drivers/pci/pci-acpi.c
View file

@ -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;
}

1
include/linux/pci-acpi.h
View file

@ -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);