[Mesa-dev] [PATCH v5 06/19] intel/isl: Add support to emit clear value address.

[Pohjolainen, Topi]

On Tue, Apr 03, 2018 at 02:55:31PM -0700, Jason Ekstrand wrote:
> On Tue, Apr 3, 2018 at 8:05 AM, Pohjolainen, Topi <
> topi.pohjolainen at gmail.com> wrote:
> 
> > On Thu, Mar 29, 2018 at 10:58:40AM -0700, Rafael Antognolli wrote:
> > > gen10 can emit the clear color by setting it on a buffer somewhere, and
> > > then adding only the address to the surface state.
> > >
> > > This commit add support for that on isl_surf_fill_state, and if that is
> > > requested, skip setting the clear value itself.
> > >
> > > v2: Add assert to make sure we are at least on gen10.
> > >
> > > Signed-off-by: Rafael Antognolli <rafael.antognolli at intel.com>
> > > Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>
> > > ---
> > >  src/intel/isl/isl.h               |  9 +++++++++
> > >  src/intel/isl/isl_surface_state.c | 18 ++++++++++++++----
> > >  2 files changed, 23 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/src/intel/isl/isl.h b/src/intel/isl/isl.h
> > > index 2edf0522e32..c50b78d4701 100644
> > > --- a/src/intel/isl/isl.h
> > > +++ b/src/intel/isl/isl.h
> > > @@ -1307,6 +1307,15 @@ struct isl_surf_fill_state_info {
> > >      */
> > >     union isl_color_value clear_color;
> > >
> > > +   /**
> > > +    * Send only the clear value address
> > > +    *
> > > +    * If set, we only pass the clear address to the GPU and it will
> > fetch it
> > > +    * from wherever it is.
> > > +    */
> > > +   bool use_clear_address;
> > > +   uint64_t clear_address;
> > > +
> > >     /**
> > >      * Surface write disables for gen4-5
> > >      */
> > > diff --git a/src/intel/isl/isl_surface_state.c
> > b/src/intel/isl/isl_surface_state.c
> > > index 32a5429f2bf..bff9693f02d 100644
> > > --- a/src/intel/isl/isl_surface_state.c
> > > +++ b/src/intel/isl/isl_surface_state.c
> > > @@ -637,11 +637,21 @@ isl_genX(surf_fill_state_s)(const struct
> > isl_device *dev, void *state,
> > >  #endif
> > >
> > >     if (info->aux_usage != ISL_AUX_USAGE_NONE) {
> > > +      if (info->use_clear_address) {
> > > +#if GEN_GEN >= 10
> > > +         s.ClearValueAddressEnable = true;
> >
> > This will set it for multisampled also and upset piglit tests. We need
> > something of this sort:
> >
> >             s.ClearValueAddressEnable = info->aux_usage !=
> > ISL_AUX_USAGE_MCS;
> >
> 
> Can we assert instead?  If the caller asks for a clear address to be set
> they should get it and not have it magically disabled when they ask for MCS.

Right, here an assert would be just fine. I should have made the comment
in patch in 19 where it belongs. There we start setting the flag
unconditionally for "info->aux_usage != ISL_AUX_USAGE_NONE". If we don't,
then on ICL we start failing multisampling tests.

> 
> 
> > > +         s.ClearValueAddress = info->clear_address;
> > > +#else
> > > +         unreachable("Gen9 and earlier do not support indirect clear
> > colors");
> > > +#endif
> > > +      }
> > >  #if GEN_GEN >= 9
> > > -      s.RedClearColor = info->clear_color.u32[0];
> > > -      s.GreenClearColor = info->clear_color.u32[1];
> > > -      s.BlueClearColor = info->clear_color.u32[2];
> > > -      s.AlphaClearColor = info->clear_color.u32[3];
> > > +      if (!info->use_clear_address) {
> > > +         s.RedClearColor = info->clear_color.u32[0];
> > > +         s.GreenClearColor = info->clear_color.u32[1];
> > > +         s.BlueClearColor = info->clear_color.u32[2];
> > > +         s.AlphaClearColor = info->clear_color.u32[3];
> > > +      }
> > >  #elif GEN_GEN >= 7
> > >        /* Prior to Sky Lake, we only have one bit for the clear color
> > which
> > >         * gives us 0 or 1 in whatever the surface's format happens to be.
> > > --
> > > 2.14.3
> > >
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