[Mesa-dev] [PATCH 10/10] i965: Require softpin support for Cannonlake and later.

[Kenneth Graunke]

On Friday, May 4, 2018 12:39:12 AM PDT Chris Wilson wrote:
> Quoting Kenneth Graunke (2018-05-04 08:34:07)
> > On Thursday, May 3, 2018 11:53:24 PM PDT Chris Wilson wrote:
> > > Quoting Kenneth Graunke (2018-05-04 02:12:40)
> > > > This isn't strictly necessary, but anyone running Cannonlake will
> > > > already have Kernel 4.5 or later, so there's no reason to support
> > > > the relocation model on Gen10+.
> > > 
> > > /o\ gvt. Need I say more?
> > > -Chris
> > 
> > Yes.  What's the deal with GVT?
> 
> Their current restrictions involve forcing the use of a 32b
> aliasing-ppgtt. Not that they support cnl+ yet, so they might remember
> to lift that restriction in time.
> -Chris

Wow, that's really miserable.  So, we can't actually depend on real
PPGTT existing?  Do you know if/when they might fix this?

This seriously wrecks a lot of my plans if we can't assume PPGTT
and have to deal with relocations for all of eternity.  Jason and I
have been planning on doing PPGTT-only drivers for months.  We figured
that full PPGTT had been working since Gen8 and surely would be viable
on anything modern.  If it weren't for enterprise kernels, I would have
required this all the way back to Gen8 in a heartbeat.

--Ken
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