linux-kernel - Re: 3.6.11 AMD-Vi: Completion-Wait loop timed out

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Date:	Wed, 23 Jan 2013 09:00:03 -0600
From:	Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:	Udo van den Heuvel <udovdh@...all.nl>
CC:	Boris Ostrovsky <boris.ostrovsky@....com>,
	Jacob Shin <jacob.shin@....com>,
	Borislav Petkov <bp@...en8.de>,
	Jörg Rödel <joro@...tes.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: 3.6.11  AMD-Vi: Completion-Wait loop timed out

On 1/23/2013 8:19 AM, Udo van den Heuvel wrote:
> 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?
Please try the first one first.  If the issue doesn't reproduce, you can 
use the second patch to try to trigger it.

Thank you,

Suravee
>
>
> Kind regards,
> Udo
>


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