[Intel-gfx] [PATCH] drm/i915: don't clflush gem objects in stolen memory

[Daniel Vetter]

On Wed, Feb 13, 2013 at 08:39:58PM +0000, Chris Wilson wrote:
> On Wed, Feb 13, 2013 at 09:56:05PM +0200, Imre Deak wrote:
> > As explained by Chris Wilson gem objects in stolen memory are always
> > coherent with the GPU so we don't need to ever flush the CPU caches for
> > these.
> > 
> > This fixes a breakage - at least with the compact sg patches applied -
> > during the resume/restore gtt mappings path, when we tried to clflush an
> > FB object in stolen memory, but since stolen objects don't have backing
> > pages we passed an invalid page pointer to drm_clflush_page().
> > 
> > Signed-off-by: Imre Deak <imre.deak at intel.com>
> 
> To the best of my knowledge, this is correct:
> Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
> 
> Though the stolen framework landed in 3.8, tough call as to whether this
> should be in 3.8 as well given the backported clflush fix... I guess we
> are simply too late, so drm-intel-next +
> Cc: stable at vger.kernel.org
> 
> Imre do you mind digging up the sha of both the introduction of stolen
> and the clflush of unbounded upon resume?

Stolen allocations seem to be only in 3.9-next, so no cc: stable. Queued
up, thanks for the patch an review.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch