linux-kernel - Re: [PATCH] PCI / PCIe / AER: Disable native AER service if BIOS has precedence (v2) (was: Re: [PATCH] PCI / PCIe / AER ...)

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Date:	Fri, 24 Sep 2010 09:53:55 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Chen Gong <gong.chen@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	Huang Ying <ying.huang@...el.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH] PCI / PCIe / AER: Disable native AER service if BIOS
 has precedence (v2) (was: Re: [PATCH]  PCI / PCIe / AER ...)

On Mon, 20 Sep 2010 18:50:00 +0200
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> On Monday, September 20, 2010, Chen Gong wrote:
> > 于 9/20/2010 6:02 AM, Rafael J. Wysocki 写道:
> > > From: Rafael J. Wysocki<rjw@...k.pl>
> > >
> > > There is a design issue related to PCIe AER and _OSC that the BIOS
> > > may be asked to grant control of the AER service even if some
> > > Hardware Error Source Table (HEST) entries contain information
> > > meaning that the BIOS really should control it.  Namely,
> > > pcie_port_acpi_setup() calls pcie_aer_get_firmware_first() that
> > > determines whether or not the AER service should be controlled by
> > > the BIOS on the basis of the HEST information for the given PCIe
> > > port.  The BIOS is asked to grant control of the AER service for
> > > a PCIe Root Complex if pcie_aer_get_firmware_first() returns 'false'
> > > for at least one root port in that complex, even if all of the other
> > > root ports' HEST entries have the FIRMWARE_FIRST flag set (and none
> > > of them has the GLOBAL flag set).  However, if the AER service is
> > > controlled by the kernel, that may interfere with the BIOS' handling
> > > of the error sources having the FIRMWARE_FIRST flag.  Moreover,
> > > there may be PCIe endpoints that have the FIRMWARE_FIRST flag set in
> > > HEST and are attached to the root ports in question, in which case it
> > > also may be unsafe to ask the BIOS for control of the AER service.
> > >
> > > For this reason, introduce a function checking if there's at least
> > > one PCIe-related HEST entry with the FIRMWARE_FIRST flag set and
> > > disable the native AER service altogether if this function returns
> > > 'true'.

Applied the second patch to my linux-next branch, thanks.

-- 
Jesse Barnes, Intel Open Source Technology Center
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