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SubjectRe: 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 Tue, Jul 17, 2018 at 06:02:07PM +0200, Paul Menzel wrote:
> $ dmesg
> […]
> [ 0.145696] calling pci_iommu_init+0x0/0x3f @ 1
> [ 0.145719] AMD-Vi: Unable to write to IOMMU perf counter.

This is likely a firmware issue. Either the IVRS ACPI table is incorrect
or the BIOS did not enable the performance counter feature in the IOMMU
hardware. Are you running on the latest BIOS?


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