linux-kernel - Re: [PATCH V4: 1/3] pci: Provide Multiple Error Received and no error source id support on AER

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Date:	Mon, 15 Jun 2009 09:48:15 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Andrew Patterson <andrew.patterson@...com>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH V4: 1/3] pci: Provide Multiple Error Received and no
	error source id support on AER

On Fri, 2009-06-12 at 22:17 +0000, Andrew Patterson wrote:
> On Fri, 2009-06-12 at 11:08 +0800, Zhang, Yanmin wrote:
> > Anyone could help me test it on powerpc? Or at least a compilation
> > to see there is any compiling error/warning. I have no powerpc machine.
> > Thanks.
> > 
> > Changelog V4:
> > 	Port the patches to Jesses' linux-next tree (mostly based on
> > 	2.6.30).
> > 
> > Changelog V3:
> >         1) Probe devices under the root port when the bus id of
> >         the source id is equal to 0; V2 does so when device id is
> >         equal to 0;
> >         2) Add more comments on critical path of finding devices.
> > 
> > Changelog V2:
> >         Version 2 adds nosourceid, a boot parameter. When
> >         aerdriver.nosourceid=y, aerdriver doesn't use the source
> >         id saved by root port. Instead, it searches the device
> >         tree under the root port to find the reporter. So if hardware
> >         has errata and root port saves a bad source id, aerdriver
> >         still could find the reporter.
> >         There are 2 scenarios under which aerdriver searches the
> >         device tree under root port:
> >         1) nosourceid=n and error source id is equal to 0;
> >         2) nosourceid=y.
> > 
> > Based on PCI Express AER specs, a root port might receive multiple
> > TLP errors while it could only save a correctable error source id
> > and an uncorrectable error source id at the same time. In addition,
> > some root port hardware might be unable to provide a correct source
> > id, i.e., the source id, or the bus id part of the source id provided
> > by root port might be equal to 0.
> > 
> > The patchset implements the support in kernel by searching the device
> > tree under the root port.
> > 
> > Patch 1 changes parameter cb of function pci_walk_bus to return a value.
> > When cb return non-zero, pci_walk_bus stops more searching on the
> > device tree.
> > 
> > Signed-off-by: Zhang Yanmin <yanmin.zhang@...ux.intel.com>
> > 
> 
> This one looks fine to me. 
> 
> Reviewed-by: Andrew Patterson <andrew.patterson@...com>
Thanks for helping review the patches.

Yanmin


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