From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michel Thierry <michel.thierry@intel.com>
Subject: Re: [PATCH] drm/i915/ppgtt: Load address space after
 mi_set_context
Date: Fri, 12 Sep 2014 17:56:30 +0100
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To: Chris Wilson <chris@chris-wilson.co.uk>, =?windows-1252?Q?Ville_Syr?= =?windows-1252?Q?j=E4l=E4?= <ville.syrjala@linux.intel.com>
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On 9/12/2014 4:40 PM, Chris Wilson wrote:
> On Fri, Sep 12, 2014 at 06:35:10PM +0300, Ville Syrj=E4l=E4 wrote:
>> On Fri, Sep 12, 2014 at 04:10:01PM +0100, Michel Thierry wrote:
>>> From: Ben Widawsky <benjamin.widawsky@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
>

I was wondering the same when I read Ben's original comment. Could this =

be GEN8 specific?