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: Jörg Rödel
Date: Fri Jul 27 2018 - 04:27:58 EST

Hi Paul,

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.

> > 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.