pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.

[Alex Hung]

On Sun, Mar 29, 2020 at 9:29 AM Paul Menzel <pmenzel at molgen.mpg.de> wrote:

> Dear fwts folks,
>
>
> Linux 5.6-rc3 (and before and later) with
>
>      [    0.000000] DMI: Micro-Star International Co., Ltd.
> MS-7A37/B350M MORTAR (MS-7A37), BIOS 1.MR 12/02/2019
>
> logs the error below.
>
>      pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
>
> According to the Linux folks this is a firmware limitation (and
> limitation of missing datasheets from AMD).
>
> Could such a check be integrated into fwts?
>

We can have fwts to scan it and to report if this string is found.

A patch was sent and is available @
http://patchwork.ozlabs.org/patch/1264475/

>
>
> Kind regards,
>
> Paul
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-- 
Cheers,
Alex Hung
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