Hi Bjorn, 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 It was marked "superseded" in patchwork and thus off my radar.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. Great! > 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: https://lists.linuxfoundation.org/pipermail/iommu/2017-March/020836.html > I admit I just don't have warm fuzzies that the problem is well > understood. 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 iommu. The iommu then can't complete the invalidation commands and the driver throws completion-wait loop timeout messages out. Joerg
