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`

From: Paul Menzel
Date: Fri Jul 27 2018 - 05:19:02 EST

Dear JÃrg,

On 07/27/18 10:27, JÃrg RÃdel 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 âbetaâ 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. Letâs see what the
result will be.

Kind regards,



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