Re: [PATCHv2 1/7] PCI/DPC: Enable ERR_COR

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On Tue, Apr 03, 2018 at 04:31:15PM +0200, Rafael J. Wysocki wrote:
> On Tue, Apr 3, 2018 at 4:16 PM, Bjorn Helgaas <helgaas@xxxxxxxxxx> wrote:
> >
> > This picture doesn't make sense to me yet.  Per the PCI Firmware spec,
> > r3.2, sec 4.5.2, we use _OSC to negotiate control over AER (and now
> > DPC).  I think _OSC is only allowed directly under a host bridge
> > device (PNP0A08 or PNP0A03), and it applies to the entire hierarchy
> > under the host bridge.
> >
> > I don't know how firmware could claim to own AER on a root port, but
> > not on switches (external or otherwise) below that root port.
> >
> > If _OSC says firmware owns AER, we won't touch AER on the root port,
> > but we also won't touch DPC on switches below the root port.  So I
> > don't see how this change will help.
> 
> This matches my understanding of that part of the spec.

Thanks, guys. It seems this patch doesn't accomplish anything.



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