[Mesa-dev] [PATCH] intel: Correct the BDW surface state size

[Kenneth Graunke]

On Thursday, March 9, 2017 3:35:15 PM PST Nanley Chery wrote:
> The PRMs state that this packet is 16 DWORDS long. Ensure that the last
> three DWORDS are zeroed as required by the hardware when allocating a
> null surface state.
> 
> Cc: <mesa-stable at lists.freedesktop.org>
> Signed-off-by: Nanley Chery <nanley.g.chery at intel.com>
> ---
>  src/intel/isl/isl.c                            | 2 +-
>  src/mesa/drivers/dri/i965/gen8_surface_state.c | 5 ++---
>  2 files changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/src/intel/isl/isl.c b/src/intel/isl/isl.c
> index 6eb1e93efd..b4bdf2059a 100644
> --- a/src/intel/isl/isl.c
> +++ b/src/intel/isl/isl.c
> @@ -56,7 +56,7 @@ static const struct {
>     [5] = {24, 32,  4},
>     [6] = {24, 32,  4},
>     [7] = {32, 32,  4, 24},
> -   [8] = {52, 64, 32, 40},
> +   [8] = {64, 64, 32, 40},
>     [9] = {64, 64, 32, 40},
>  };
>  
> diff --git a/src/mesa/drivers/dri/i965/gen8_surface_state.c b/src/mesa/drivers/dri/i965/gen8_surface_state.c
> index 501531d4ad..f868293217 100644
> --- a/src/mesa/drivers/dri/i965/gen8_surface_state.c
> +++ b/src/mesa/drivers/dri/i965/gen8_surface_state.c
> @@ -46,10 +46,9 @@ static uint32_t *
>  gen8_allocate_surface_state(struct brw_context *brw,
>                              uint32_t *out_offset, int index)
>  {
> -   int dwords = brw->gen >= 9 ? 16 : 13;
>     uint32_t *surf = __brw_state_batch(brw, AUB_TRACE_SURFACE_STATE,
> -                                      dwords * 4, 64, index, out_offset);
> -   memset(surf, 0, dwords * 4);
> +                                      64, 64, index, out_offset);
> +   memset(surf, 0, 64);
>     return surf;
>  }
>  
> 

Does this actually fix anything, or just use more batch space?

--Ken
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