[Mesa-stable] [PATCH] i965/gen7_urb: Re-emit PUSH_CONSTANT_ALLOC on GLK

[Kenneth Graunke]

On Monday, August 27, 2018 11:03:33 AM PDT Nanley Chery wrote:
> On Fri, Aug 24, 2018 at 05:46:44PM -0700, Nanley Chery wrote:
> > According to internal docs, some gen9 platforms have a pixel shader push
> > constant synchronization issue. Although not listed among said
> > platforms, this issue seems to be present on the GeminiLake 2x6's we've
> > tested.
> > 
> > We consider the available workarounds to be too detrimental on
> > performance. Instead, we mitigate the issue by applying part of one of
> > the workarounds. Re-emit PUSH_CONSTANT_ALLOC at the top of every batch
> > (as suggested by Ken).
> > 
> > Fixes ext_framebuffer_multisample-accuracy piglit test failures with the
> > following options:
> > * 6 depth_draw small depthstencil
> > * 8 stencil_draw small depthstencil
> > * 6 stencil_draw small depthstencil
> > * 8 depth_resolve small
> > * 6 stencil_resolve small depthstencil
> > * 4 stencil_draw small depthstencil
> > * 16 stencil_draw small depthstencil
> > * 16 depth_draw small depthstencil
> > * 2 stencil_resolve small depthstencil
> > * 6 stencil_draw small
> > * all_samples stencil_draw small
> > * 2 depth_draw small depthstencil
> > * all_samples depth_draw small depthstencil
> > * all_samples stencil_resolve small
> > * 4 depth_draw small depthstencil
> > * all_samples depth_draw small
> > * all_samples stencil_draw small depthstencil
> > * 4 stencil_resolve small depthstencil
> > * 4 depth_resolve small depthstencil
> > * all_samples stencil_resolve small depthstencil
> > 
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106865
> > Cc: <mesa-stable at lists.freedesktop.org>
> > ---
> >  src/mesa/drivers/dri/i965/gen7_urb.c | 23 +++++++++++++++++++++++
> >  1 file changed, 23 insertions(+)
> 
> Ping?

So...I believe those tests are still intermittent on other platforms.

And...these platforms aren't listed as having the bug that you're trying
to work around here.

Which makes me wonder if a GLK2x6 hack is really the right thing to do.
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