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PCI/ACPI: provide MMCONFIG address for PCI host bridges

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This patch provide MMCONFIG address for PCI host bridges, which will
be used to support host bridge hotplug.  It gets MMCONFIG address
by evaluating _CBA method if available.

Reviewed-by: Yinghai Lu <[email protected]>
Signed-off-by: Jiang Liu <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
This commit is contained in:
Jiang Liu 2012-06-22 14:55:16 +08:00 • committed by Bjorn Helgaas
commit f4b57a3b43
5 changed files with 19 additions and 0 deletions
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14
drivers/pci/pci-acpi.c
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@ -162,6 +162,20 @@ acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
return remove_pm_notifier(dev, pci_acpi_wake_dev);
}
phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
{
acpi_status status = AE_NOT_EXIST;
unsigned long long mcfg_addr;
if (handle)
status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
NULL, &mcfg_addr);
if (ACPI_FAILURE(status))
return 0;
return (phys_addr_t)mcfg_addr;
}
/*
* _SxD returns the D-state with the highest power
* (lowest D-state number) supported in the S-state "x".