From: Bjorn Helgaas <helgaas@kernel.org>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: linux-pci@vger.kernel.org, bhelgaas@google.com,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/5] PCI: Balance ports to avoid ACS errata on Pericom switches
Date: Mon, 14 Nov 2016 15:03:19 -0600 [thread overview]
Message-ID: <20161114210319.GC9868@bhelgaas-glaptop.roam.corp.google.com> (raw)
In-Reply-To: <20161026180140.23495.27388.stgit@gimli.home>
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.
next prev parent reply other threads:[~2016-11-14 21:03 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-26 18:01 [PATCH 0/5] PCI: ACS enable quirk for link balancing switches Alex Williamson
2016-10-26 18:01 ` [PATCH 1/5] PCI: Make pci_std_enable_acs() non-static Alex Williamson
2016-11-14 20:59 ` Bjorn Helgaas
2016-10-26 18:01 ` [PATCH 2/5] PCI: Extract link speed & width retrieval from pcie_get_minimum_link() Alex Williamson
2016-11-14 21:02 ` Bjorn Helgaas
2016-10-26 18:01 ` [PATCH 3/5] PCI: Extract link retraining from pcie_aspm_configure_common_clock() Alex Williamson
2016-10-26 20:42 ` Alex Williamson
2016-10-26 18:01 ` [PATCH 4/5] iommu: Move REQ_ACS_FLAGS out to header and rename Alex Williamson
2016-11-10 12:27 ` Joerg Roedel
2016-11-11 22:57 ` Bjorn Helgaas
2016-11-14 12:48 ` Joerg Roedel
2016-10-26 18:01 ` [PATCH 5/5] PCI: Balance ports to avoid ACS errata on Pericom switches Alex Williamson
2016-11-14 21:03 ` Bjorn Helgaas [this message]
2016-11-14 21:21 ` Alex Williamson
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