PCI run-time PM support (rev. 4)

Hi,

The following (updated) series of patches provides basic run-time power
management support for PCI devices through ACPI and/or the native PCIe
PME.

Patches [1/8] and [3/8] are unchanged, the other patches have been modified to
address the reviewers' comments and/or to fix reported bugs.

[1/8] - Add function for checking PME status of devices

[2/8][Updated] - PCIe PME root port service driver

[3/8] - "Don't use MSIs for PME signaling" switch for PCIe
 
[4/8][New] - ACPI GPE refcounting, based on 3 patches from Matthew Garrett
 
[5/8][Updated] - ACPI, add fields for handling run-wake devices

[6/8][New] - ACPI, make it possible to use more than 1 notify handler per node

[7/8][Updated] - PCI / ACPI platform support for run-time power management

[8/8] - Runtime PM callbacks for the PCI bus type

Bob, Len, patches [4/8] and [6/8] are vitally important for this feature, but
they cannot be merged without your approval.  Please let me know if you have
any objections to these patches.

Thanks,
Rafael

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