[Intel-gfx] [PATCH] drm/i915/ppgtt: Load address space after mi_set_context

[Chris Wilson]

On Fri, Sep 12, 2014 at 06:35:10PM +0300, Ville Syrjälä wrote:
> On Fri, Sep 12, 2014 at 04:10:01PM +0100, Michel Thierry wrote:
> > From: Ben Widawsky <benjamin.widawsky at intel.com>
> > 
> > The simple explanation is, the docs say to do this for GEN8. Perhaps we
> > want to do this for GEN7 too, I am not certain.
> > 
> > PDPs are saved and restored with context. Contexts (without execlists)
> > only exist on the render ring. The docs say that PDPs are not power
> > context save/restored.  I've learned that this actually means something
> > which SW doesn't care about. So pretend the statement doesn't exist.
> > For non RCS, nothing changes.

Hang on. This is exactly what I was worried about... Which PDPs are
saved with context? Why doesn't this mean that we aren't overwitting
PDPs in use on other rings when RCS loads a new context?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre