[PATCH 0/2] PCI/AER: Consistently use _OSC to determine who owns AER

[David Laight]

From: Alexandru Gagniuc
> Sent: 15 November 2018 23:16
...
> I've asked around a few people at Dell and they unanimously agree that
> _OSC is the correct way to determine ownership of AER.

This is all very well, but we have systems (they might be Dell ones)
where failure of a PCIe link (even when all the drivers are removed)
causes an NMI - and crashes the kernel.

There are other systems which have AER registers available for
some of the PCIe devices, but the BIOS ignores them and _OSC
doesn't let the kernel take control.
In this case the AER registers can contain useful information
after a read returns ~0u.
It would be useful to be able to get this information without
having to grovel through all the PCIe config space.

	David

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