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

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Message-ID: <50FBD413.1000406@xs4all.nl>
Date:	Sun, 20 Jan 2013 12:25:07 +0100
From:	Udo van den Heuvel <udovdh@...all.nl>
To:	Jörg Rödel <joro@...tes.org>
CC:	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org
Subject: Re: 3.6.11  AMD-Vi: Completion-Wait loop timed out

Hello Jörg,

On 2013-01-20 12:19, Jörg Rödel wrote:
> On Sun, Jan 20, 2013 at 11:40:20AM +0100, Udo van den Heuvel wrote:
>> Hello,
>>
>> On 2013-01-20 11:36, Borislav Petkov wrote:
>>> I know just the guy, CCed. :-)
>>
>> Thanks for the quick response!
>> I found this similar case:
>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1073384
> 
> Yes, this is a Hardware issue for which the BIOS does not apply the
> workaround.

Hardware issue? What is wrong c.q. happening?

I have this:

# dmesg|grep IOMMU
[    0.000000] ACPI: IVRS 000000009dd12420 00070 (v02  AMD   AMDIOMMU
00000001 AMD  00000000)
[    0.000000] Please enable the IOMMU option in the BIOS setup
[    1.125636] AMD-Vi: Found IOMMU at 0000:00:00.2 cap 0x40

So kernel says I have no IOMMU but still one is found? (!?)

> The only solution for now is to disable the IOMMU on the
> Trinity based chips. 

In PC-BIOS I assume?
I did not yet find an option, but this is the first occurrence.
Can the BIOS vendor fix this? If so: please explain so I cna contact
Gigabyte (motherboard manufacturer)

> The question is what to do now, I tend to disable the IOMMU if a
> Trinity chip is detected. This is not the first report of this problem
> I encountered.

I know, see the URL I posted.
What is the impact of disabling the IOMMU?


Udo
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