[Mesa-dev] [PATCH v4 13/18] i965/surface_state: Emit the clear color address instead of value.

[Rafael Antognolli]

On Tue, Mar 27, 2018 at 11:19:43AM -0700, Jason Ekstrand wrote:
> On Tue, Mar 27, 2018 at 4:37 AM, Pohjolainen, Topi <topi.pohjolainen at gmail.com>
> wrote:
> 
>     On Thu, Mar 08, 2018 at 08:49:06AM -0800, Rafael Antognolli wrote:
>     > On Gen10, when emitting the surface state, use the value stored in the
>     > clear color entry buffer by using a clear color address in the surface
>     > state.
>     >
>     > v4: Use the clear color offset from the clear_color_bo, when available.
>     >
>     > Signed-off-by: Rafael Antognolli <rafael.antognolli at intel.com>
>     > ---
>     >  src/mesa/drivers/dri/i965/brw_wm_surface_state.c | 29
>     +++++++++++++++++++++++-
>     >  1 file changed, 28 insertions(+), 1 deletion(-)
>     >
>     > diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/
>     drivers/dri/i965/brw_wm_surface_state.c
>     > index caa92d7d878..268effef397 100644
>     > --- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
>     > +++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
>     > @@ -152,7 +152,7 @@ brw_emit_surface_state(struct brw_context *brw,
>     >
>     >     union isl_color_value clear_color = { .u32 = { 0, 0, 0, 0 } };
>     >
>     > -   struct brw_bo *aux_bo;
>     > +   struct brw_bo *aux_bo = NULL;
>     >     struct isl_surf *aux_surf = NULL;
>     >     uint64_t aux_offset = 0;
>     >     switch (aux_usage) {
>     > @@ -186,6 +186,20 @@ brw_emit_surface_state(struct brw_context *brw,
>     >                                   brw->isl_dev.ss.align,
>     >                                   surf_offset);
>     >
>     > +   bool use_clear_address = devinfo->gen >= 10 && aux_surf;
>     > +
>     > +   struct brw_bo *clear_bo = NULL;
>     > +   uint32_t clear_offset = 0;
>     > +   if (use_clear_address) {
>     > +      if (mt->mcs_buf && mt->mcs_buf->clear_color_bo) {
>     > +         clear_bo = mt->mcs_buf->clear_color_bo;
>     > +         clear_offset = mt->mcs_buf->clear_color_offset;
> 
>     In case of "mt->mcs_buf" holding the clear value one needs to use
>     "mt->mcs_buf->clear_color_offset" instead of "aux_surf->size" as that
>     includes the space reserved for clear value and hence points past it
>     (aux_offset doesn't matter is it will be zero in that case):
> 
> 
> I'm pretty sure the second case is now dead and should be deleted.

Ugh, that's right, I removed it from brw_blorp.c but forgot it here :-/

>             } else if (mt->mcs_buf) {
>                clear_bo = aux_bo;
>                clear_offset = mt->mcs_buf->clear_color_offset;
> 
>     > +      } else {
>     > +         clear_bo = aux_bo;
>     > +         clear_offset = aux_offset + aux_surf->size;
>     > +      }
>     > +   }
>     > +
>     >     isl_surf_fill_state(&brw->isl_dev, state, .surf = &surf, .view = &
>     view,
>     >                         .address = brw_state_reloc(&brw->batch,
>     >                                                    *surf_offset + brw->
>     isl_dev.ss.addr_offset,
>     > @@ -194,6 +208,8 @@ brw_emit_surface_state(struct brw_context *brw,
>     >                         .aux_address = aux_offset,
>     >                         .mocs = brw_get_bo_mocs(devinfo, mt->bo),
>     >                         .clear_color = clear_color,
>     > +                       .use_clear_address = use_clear_address,
>     > +                       .clear_address = clear_offset,
>     >                         .x_offset_sa = tile_x, .y_offset_sa = tile_y);
>     >     if (aux_surf) {
>     >        /* On gen7 and prior, the upper 20 bits of surface state DWORD 6
>     are the
>     > @@ -223,6 +239,17 @@ brw_emit_surface_state(struct brw_context *brw,
>     >
>     >        }
>     >     }
>     > +
>     > +   if (use_clear_address) {
>     > +      /* Make sure the offset is aligned with a cacheline. */
>     > +      assert((clear_offset & 0x3f) == 0);
>     > +      uint32_t *clear_address =
>     > +            state + brw->isl_dev.ss.clear_color_state_offset;
>     > +      *clear_address = brw_state_reloc(&brw->batch,
>     > +                                       *surf_offset +
>     > +                                       brw->isl_dev.ss.clear_color_
>     state_offset,
>     > +                                       clear_bo, *clear_address,
>     reloc_flags);
>     > +   }
>     >  }
>     >
>     >  static uint32_t
>     > --
>     > 2.14.3
>     >
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