[Intel-gfx] [PATCH] drm/i915: Make contexts non-snooped on non-LLC platforms

[Ville Syrjälä]

On Tue, Apr 01, 2014 at 11:19:19AM +0100, Chris Wilson wrote:
> On Tue, Apr 01, 2014 at 01:11:02PM +0300, Ville Syrjälä wrote:
> > On Mon, Mar 31, 2014 at 04:39:37PM +0100, Chris Wilson wrote:
> > > On Mon, Mar 31, 2014 at 06:09:49PM +0300, ville.syrjala at linux.intel.com wrote:
> > > > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > > > 
> > > > We don't do CPU access to GPU contexts so making the GPU access snoop
> > > > the CPU caches seems silly, and potentially expensive.
> > > > 
> > > > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > > 
> > > Maybe define a macro to be HAS_L3_CACHE?
> > 
> > What should I do with such a macro?
> 
> I am trying to express what exactly we are testing for here. It is not
> exactly LLC we care about, but L3 to hide the context switch latency.
> Even though Ben thinks that's a waste of our limited resources.

VLV has L3 too, but we can't control it via the PTEs.

-- 
Ville Syrjälä
Intel OTC