[Mesa-dev] [PATCH] intel/blorp: Define the clear value bounds for HiZ clears

[Nanley Chery]

On Mon, Oct 29, 2018 at 08:37:13AM -0500, Jason Ekstrand wrote:
> That's likely because Nanley forgot to CC this one too stable:
> 
> https://cgit.freedesktop.org/mesa/mesa/commit/?id=5bcf479524b96554cab7d2429dacf650b4054638
> 

Our submittingpatches.html doc says that using the Fixes tag should be
enough. Did I miss something here?

-Nanley

> On October 29, 2018 06:49:47 "Juan A. Suarez Romero" <jasuarez at igalia.com>
> wrote:
> 
> > On Thu, 2018-10-25 at 16:25 -0700, nanleychery at gmail.com wrote:
> > > From: Nanley Chery <nanley.g.chery at intel.com>
> > > 
> > > Follow the restriction of making sure the clear value is between the min
> > > and max values defined in CC_VIEWPORT. Avoids a simulator warning for
> > > some piglit tests, one of them being:
> > > 
> > > ./bin/depthstencil-render-miplevels 146 d=z32f_s8
> > > 
> > > Jason found this to make a GPU hang go away on SKL.
> > > 
> > > Fixes: 09948151ab1d5184b4dd9052bb1f710fa1e00a7b
> > >        ("intel/blorp: Add the BDW+ optimized HZ_OP sequence to BLORP")
> > 
> > 
> > As 09948151ab1 ("intel/blorp: Add the BDW+ optimized HZ_OP sequence to BLORP")
> > is included in 18.2 branch, adding this to 18.2 queue.
> > 
> > It doesn't apply cleanly, so I've fixed the conflicts. You can check the fixed
> > commit at:
> > 
> > 
> > https://gitlab.freedesktop.org/mesa/mesa/commit/aaff8c7a0ed55d71e9dd0a6fef6905d6a2536c3f
> > 
> > 	J.A.
> > 
> > > ---
> > >  src/intel/blorp/blorp_genX_exec.h | 14 ++++++++++++++
> > >  1 file changed, 14 insertions(+)
> > > 
> > > diff --git a/src/intel/blorp/blorp_genX_exec.h
> > > b/src/intel/blorp/blorp_genX_exec.h
> > > index 50341ab0ecf..7a8c45dbee5 100644
> > > --- a/src/intel/blorp/blorp_genX_exec.h
> > > +++ b/src/intel/blorp/blorp_genX_exec.h
> > > @@ -1628,6 +1628,20 @@ blorp_emit_gen8_hiz_op(struct blorp_batch *batch,
> > >      */
> > >     blorp_emit_3dstate_multisample(batch, params);
> > > 
> > > +   /* From the BDW PRM Volume 7, Depth Buffer Clear:
> > > +    *
> > > +    *    The clear value must be between the min and max depth values
> > > +    *    (inclusive) defined in the CC_VIEWPORT. If the depth buffer format is
> > > +    *    D32_FLOAT, then +/-DENORM values are also allowed.
> > > +    *
> > > +    * Set the bounds to match our hardware limits, [0.0, 1.0].
> > > +    */
> > > +   if (params->depth.enabled && params->hiz_op == ISL_AUX_OP_FAST_CLEAR) {
> > > +      assert(params->depth.clear_color.f32[0] >= 0.0f);
> > > +      assert(params->depth.clear_color.f32[0] <= 1.0f);
> > > +      blorp_emit_cc_viewport(batch);
> > > +   }
> > > +
> > >     /* If we can't alter the depth stencil config and multiple layers are
> > >      * involved, the HiZ op will fail. This is because the op requires that a
> > >      * new config is emitted for each additional layer.
> > 
> > _______________________________________________
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> > mesa-dev at lists.freedesktop.org
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> 
> 
>