linux-kernel - Re: MSI B350M MORTAR: `AMD-Vi: Unable to write to IOMMU perf counter.` and `pci 0000:00:00.2: can't derive routing for PCI INT A`

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Message-ID: <92922faa-164d-002b-9a5e-1865a57f1bdb@molgen.mpg.de>
Date:   Fri, 27 Jul 2018 11:18:56 +0200
From:   Paul Menzel <pmenzel+linux-iommu@...gen.mpg.de>
To:     Jörg Rödel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: MSI B350M MORTAR: `AMD-Vi: Unable to write to IOMMU perf
 counter.` and `pci 0000:00:00.2: can't derive routing for PCI INT A`

Dear Jörg,


On 07/27/18 10:27, Jörg Rödel wrote:

> On Mon, Jul 23, 2018 at 12:09:37PM +0200, Paul Menzel wrote:
>>> or the BIOS did not enable the performance counter feature in the IOMMU
>>> hardware.
>>
>> Is it possible to check that from the OS side?
> 
> It would be if we had the NB documentation, but I guess those details
> are not publicly available.

On the AMD site [1] I see the three family 0x17 documents below.

1.  Open-Source Register Reference for AMD Family 17h Processors (PUB)
2.  Processor Programming Reference (PPR) for AMD Family 17h Models 00h-0Fh Processors (PUB)
3.  Software Optimization Guide for AMD Family 17h Processors (PUB)

What documented is required? The BKDG?

>>> Are you running on the latest BIOS?
>>
>> Yes, I am even using a “beta“ one from [1].
>>
>> DMI: MSI MS-7A37/B350M MORTAR (MS-7A37), BIOS 1.G1 05/17/2018
> 
> I think the best you can do is to report this as a bug to your BIOS
> vendor and hope they'll fix it.

I contacted them with the problem description. Let’s see what the
result will be.


Kind regards,

Paul


[1]: https://developer.amd.com/resources/developer-guides-manuals/


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