linux-kernel - Re: [PATCH 5/5] PCI: Balance ports to avoid ACS errata on Pericom switches

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Date:   Mon, 14 Nov 2016 15:03:19 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     linux-pci@...r.kernel.org, bhelgaas@...gle.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] PCI: Balance ports to avoid ACS errata on Pericom
 switches

On Wed, Oct 26, 2016 at 12:01:40PM -0600, Alex Williamson wrote:
> As described in the included code comment, this quirk is intended to
> work around an errata in a variety of Pericom 4-lane, 3 and 4 port
> PCIe 2.0 switches.  The switches advertise ACS capabilities, but the
> P2P Request Redirection support includes an errata that PCI_ACS_RR
> effectively doesn't work and results in transactions being queued and
> not delivered within the PCIe switch.  The errata has no planned
> hardware fix.

Is there a published erratum we can reference here?  It'd be really
nice to have a URL.