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

2017-03-22 Thread 'j...@8bytes.org'
On Tue, Mar 21, 2017 at 04:30:55PM +, Deucher, Alexander wrote: > > I am preparing a debug-patch that disables ATS for these GPUs so someone > > with such a chip can test it. > > Thanks Joerg. Here is a debug patch, using the hard hammer of disabling the use of ATS completly in the AMD IOMMU

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

2017-03-21 Thread 'j...@8bytes.org'
On Tue, Mar 21, 2017 at 04:17:40PM +, Deucher, Alexander wrote: > > -Original Message- > > From: 'j...@8bytes.org' [mailto:j...@8bytes.org] > > Sent: Tuesday, March 21, 2017 12:11 PM > > To: Deucher, Alexander > > Cc: Alex De

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

2017-03-21 Thread 'j...@8bytes.org'
On Tue, Mar 21, 2017 at 04:01:53PM +, 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

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

2017-03-21 Thread j...@8bytes.org
On Fri, Mar 17, 2017 at 11:53:09AM -0400, Alex Deucher wrote: > On Fri, Mar 17, 2017 at 8:15 AM, Daniel Drake wrote: > > Hi, > > > > On Mon, Mar 13, 2017 at 2:01 PM, Deucher, Alexander > > wrote: > >> > We are unable to boot Acer Aspire E5-553G (AMD FX-9800P RADEON R7) nor > >> > Acer Aspire E5-5