linux-kernel - Re: [PATCH v4 5/8] PCI/DPC: Converge EDR and DPC Path of clearing AER registers

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Date:   Thu, 21 Oct 2021 12:11:30 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Naveen Naidu <naveennaidu479@...il.com>
Cc:     bhelgaas@...gle.com, ruscur@...sell.cc, oohall@...il.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Keith Busch <kbusch@...nel.org>, Sinan Kaya <okaya@...nel.org>,
        Oza Pawandeep <poza@...eaurora.org>
Subject: Re: [PATCH v4 5/8] PCI/DPC: Converge EDR and DPC Path of clearing
 AER registers

On Thu, Oct 21, 2021 at 10:23:30PM +0530, Naveen Naidu wrote:
> On 20/10, Bjorn Helgaas wrote:
> > On Tue, Oct 05, 2021 at 10:48:12PM +0530, Naveen Naidu wrote:

> > > In EDR path, AER status registers are cleared irrespective of whether
> > > the error was an RP PIO or unmasked uncorrectable error. But in DPC, the
> > > AER status registers are cleared only when it's an unmasked uncorrectable
> > > error.
> > > 
> > > This leads to two different behaviours for the same task (handling of
> > > DPC errors) in FFS systems and when native OS has control.
> > 
> > FFS?
> 
> Firmware First Systems

I assumed that's what it was, but it's helpful to use the same terms
used by the specs to make things easier to find.  I don't think it's
actually the case that "Firmware First" necessary applies to the
entire system, since the ACPI FIRMWARE_FIRST flag is a per-error
source thing, not a per-system thing.