Re: [PATCH v2] PCI: Add ATS-disable quirk for AMD Stoney GPUs
From: Joerg Roedel
Date: Fri Jun 16 2017 - 12:29:31 EST
On Thu, Jun 15, 2017 at 02:15:45PM -0500, Bjorn Helgaas wrote:
> It was marked "superseded" in patchwork and thus off my radar. I
> don't remember if I did that or why. I changed it back to "New" so I
> won't forget about it.
> You mention (May 24) the original bug report. Can you include the URL
> for that?
I think there were multiple reports, here is one I could still find:
> I admit I just don't have warm fuzzies that the problem is well
The current understanding (without my ability to debug the hardware
involved) is that the GPU in the Stoney systems gets into a weird state
when ATS invalidations are sent too fast and stops responding to the
The iommu then can't complete the invalidation commands and the driver
throws completion-wait loop timeout messages out.