amd-iommu: can't boot with amdgpu, AMD-Vi: Completion-Wait loop timed out

['joro@8bytes.org']

On Tue, Mar 21, 2017 at 04:01:53PM +0000, Deucher, Alexander wrote:
> It seems to only affect Stoney systems, but not others (Carrizo,
> Bristol, etc.).  Maybe we could just disable it on Stoney until we
> root cause it.

Completion-wait loop timeouts indicate something is seriously wrong. How
can I detect whether I am running on a 'Stoney' system?

Other question, a shot into the dark, does the GPU on these systems have
ATS? Probably yes, as they are likely HSA compatible.


	Joerg