Ryzen 1600X with mem_encrypt=on

[Sami Farin]

On Thu, May 03, 2018 at 15:37:34 +0200, Christian König wrote:
> Am 26.04.2018 um 08:45 schrieb Sami Farin:
> > On Wed, Apr 25, 2018 at 16:59:43 -0400, Alex Deucher wrote:
> > > On Wed, Apr 25, 2018 at 1:13 PM, Sami Farin <hvtaifwkbgefbaei at gmail.com> wrote:
> > > > Is it supposed to work?  Now if I use that option, monitor powers off
> > > > (no signal) when it's initializing amdgpu and I have to reset the computer.
> > > > Instead of crashing, could it not just give an error or something?
> > > Do you have the IOMMU enabled?  I'm guessing there is some issue in
> > > the IOMMU code or in TTM causing the C bit (bit 47) to get dropped
> > > somewhere.  Your GPU only supports a 40 bit DMA mask, so either IOMMU
> > > or bounce buffers would be required to remap the address into a range
> > > the GPU could access.
> > > 
> > > Alex
> > I have IOMMU.
> 
> Mhm, from those logs at least in theory it should work fine.
> 
> There really isn't any other error message and the system isn't accessible
> using SSH over the network?

Well, sysrq does not work, I have to press reset button, so I presume
ssh would not work, either.

> I would guess that we get at least some kind of error message or failure to
> start the driver, but a complete crash is rather unexpected.

Well I could try boot_delay kernel param, or if you have suspicion about
some function I could add some printk + delay there.

> Regards,
> Christian.

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