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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20161114210319.GC9868@bhelgaas-glaptop.roam.corp.google.com>
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.