[Intel-gfx] [PATCH] drm/i915: Force synchronous TLB invalidations on the BLT ring for SNB+

[Daniel Vetter]

On Wed, Nov 09, 2011 at 12:17:06PM -0800, Eric Anholt wrote:
> On Wed, 09 Nov 2011 19:15:06 +0000, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> > On Wed, 09 Nov 2011 10:57:00 -0800, Eric Anholt <eric at anholt.net> wrote:
> > > On Wed,  9 Nov 2011 17:32:26 +0000, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> > > > We are advised that in order to workaround the TLB invalidation being
> > > > performed asynchronously with the command streamer that we need to use
> > > > a post-sync write along with the invalidations in the MI_FLUSH_DW so
> > > > that all operations are complete before executing the next command in
> > > > the ringbuffer.
> > > > 
> > > > References: https://bugs.freedesktop.org/show_bug.cgi?id=37990
> > > > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > > > Cc: Jesse Barnes <jbarnes at virtuousgeek.org>
> > > 
> > > I find the "References:" to a bug that this is not confirmed to fix to
> > > be very misleading.
> > 
> > Because it references a bug I think is due to TLB invalidations as the
> > glitches look very similar to earlier TLB invalidation.
> 
> That sort of context included with the bz reference would make me feel
> more comfortable.

What's the status of this patch? If you resend can you clarify the
bugzilla reference and also include a Bspec/PRM/whatever citation for
this workaround?

Thanks, Daniel
-- 
Daniel Vetter
Mail: daniel at ffwll.ch
Mobile: +41 (0)79 365 57 48