- Rename the default implementation of 'pcib_request_feature' and add
a pcib_request_feature() wrapper function (as is often done for
new-bus APIs implemented via kobj) that accepts a single function.
Previously the call to pcib_request_feature() ended up invoking the
method on the great-great-grandparent of the bridge device instead
of the grandparent. For a bridge that was a direct child of pci0 on
x86 this resulted in the method skipping over the Host-PCI bridge
driver and being invoked against nexus0
- When invoking _OSC from a Host-PCI bridge driver, invoke
device_get_softc() against the Host-PCI bridge device instead of the
child bridge that is requesting HotPlug. Using the wrong softc data
resulted in garbage being passed for the ACPI handle causing the
_OSC call to fail.
- While here, perform some other cleanups to _OSC handling in the ACPI
Host-PCI bridge driver:
- Don't invoke _OSC when requesting a control that has already been
granted by the firmware.
- Don't set the first word of the capability array before invoking
_OSC. This word is always set explicitly by acpi_EvaluateOSC()
since it is UUID-independent.
- Don't modify the set of granted controls unless _OSC doesn't exist
(which is treated as always successful), or the _OSC method
doesn't fail.
- Don't require an _OSC status of 0 for success. _OSC always
returns the updated control mask even if it returns a non-zero
status in the first word.
- Whine if _OSC ever tries to revoke a previously-granted control.
(It is not supposed to do that.)
- While here, add constants for the _OSC status word in acpivar.h
(though currently unused).
Reported by: adrian
Reviewed by: imp
MFC after: 1 week
Tested on: Lenovo x220
Differential Revision: https://reviews.freebsd.org/D10520
2750ce9b17