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Date: Wed, 23 Jan 2013 15:19:10 +0100
From: Udo van den Heuvel <udovdh@xs4all.nl>
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To: Suravee Suthikulanit <suravee.suthikulpanit@amd.com>
CC: Boris Ostrovsky <boris.ostrovsky@amd.com>, Jacob Shin <jacob.shin@amd.com>,
        Borislav Petkov <bp@alien8.de>,
        =?UTF-8?B?SsO2cmcgUsO2ZGVs?= <joro@8bytes.org>,
        linux-kernel@vger.kernel.org
Subject: Re: 3.6.11  AMD-Vi: Completion-Wait loop timed out
References: <50FBC7EF.6040207@xs4all.nl> <20130120103652.GB16800@pd.tnic>  <50FBC994.8020409@xs4all.nl> <20130120111920.GL25591@8bytes.org>  <50FBD413.1000406@xs4all.nl> <20130120114011.GN25591@8bytes.org>  <20130120114828.GB16519@pd.tnic> <20130121160450 <50FE9E76.30702@xs4all.nl> <50FEA3F2.1070408@amd.com> <50FEAFEB.7020103@xs4all.nl> <50FEBA69.60106@amd.com> <50FEBE5D.7040905@xs4all.nl> <50FF20F2.9090503@amd.com>
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On 2013-01-23 00:29, Suravee Suthikulanit wrote:
> I sent out a patch
> (http://marc.info/?l=linux-kernel&m=135889686523524&w=2) which should
> implement
> the workaround for AMD processor family15h model 10-1Fh erratum 746 in
> the IOMMU driver.
> In your case, the output from "setpci -s 00:00.02 F4.w" is "0050" which
> tells me that BIOS doesn't
> implement the work around. After patching, you should see the following
> message in "dmesg".
> 
> "AMD-Vi: Applying erratum 746 for IOMMU at 0000:00:00.2"

Thanks!
I'll check for that after these messages.

> The following patch slightly modify
> the code to always issue "COMPLETION_WAIT" after every command.  This
> should help increasing the chance of reproducing
> the issue.

Should I test with these two patches together?
Or should I apply the first one first and then see what the second can help?


Kind regards,
Udo