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: <20180727082754.hk44xktdydduu3qo@8bytes.org>
Date:   Fri, 27 Jul 2018 10:27:54 +0200
From:   Jörg Rödel <joro@...tes.org>
To:     Paul Menzel <pmenzel+linux-iommu@...gen.mpg.de>
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`

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 “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.


	Joerg