[Mesa-dev] [PATCH 5/6 v4] i965: Upload binding tables in hw-generated binding table format.

[Kenneth Graunke]

On Friday, July 17, 2015 12:38:39 PM Abdiel Janulgue wrote:
> When hardware-generated binding tables are enabled, use the hw-generated
> binding table format when uploading binding table state.
> 
> Normally, the CS will will just consume the binding table pointer commands
> as pipelined state. When the RS is enabled however, the RS flushes whatever
> edited surface state entries of our on-chip binding table to the binding
> table pool before passing the command on to the CS.
> 
> Note that the the binding table pointer offset is relative to the binding table
> pool base address when resource streamer instead of the surface state base address.
> 
> v2: Fix possible buffer overflow when allocating a chunk out of the
>     hw-binding table pool (Ken).
> v3: Remove extra newline and add missing brace around if-statement (Matt).
> v4: Fix broken INTEL_DEBUG=shader_time for hw-generated binding tables.
>     Document PRM WaStateBindingTableOverfetch workaround.
> 
> Cc: kenneth at whitecape.org
> Cc: mattst88 at gmail.com
> Signed-off-by: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
> ---
>  src/mesa/drivers/dri/i965/brw_binding_tables.c | 64 ++++++++++++++++++++++----
>  1 file changed, 55 insertions(+), 9 deletions(-)
> 
> diff --git a/src/mesa/drivers/dri/i965/brw_binding_tables.c b/src/mesa/drivers/dri/i965/brw_binding_tables.c
> index 41590ec..48e75ff 100644
> --- a/src/mesa/drivers/dri/i965/brw_binding_tables.c
> +++ b/src/mesa/drivers/dri/i965/brw_binding_tables.c
> @@ -50,6 +50,33 @@ static const GLuint stage_to_bt_edit[MESA_SHADER_FRAGMENT + 1] = {
>     _3DSTATE_BINDING_TABLE_EDIT_PS,
>  };
>  
> +static uint32_t
> +reserve_hw_bt_space(struct brw_context *brw, unsigned bytes)
> +{
> +   /* From the Broadwell PRM, Volume 15: Workarounds,

Volume 16

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

> +    * WaStateBindingTableOverfetch:
> +    *
> +    * HW over fetches two cache lines of binding table indices. When using the
> +    * resource streamer, SW needs to pad binding table pointer updates with an
> +    * additional two cache lines.
> +    */
> +   if (brw->hw_bt_pool.next_offset + bytes >= brw->hw_bt_pool.bo->size - 128) {
> +      gen7_reset_hw_bt_pool_offsets(brw);
> +   }
> +
> +   uint32_t offset = brw->hw_bt_pool.next_offset;
> +
> +   /* From the Haswell PRM, Volume 2b: Command Reference: Instructions,
> +    * 3DSTATE_BINDING_TABLE_POINTERS_xS:
> +    *
> +    * "If HW Binding Table is enabled, the offset is relative to the
> +    *  Binding Table Pool Base Address and the alignment is 64 bytes."
> +    */
> +   brw->hw_bt_pool.next_offset += ALIGN(bytes, 64);
> +
> +   return offset;
> +}
> +
>  /**
>   * Upload a shader stage's binding table as indirect state.
>   *
> @@ -78,22 +105,41 @@ brw_upload_binding_table(struct brw_context *brw,
>              brw->shader_time.bo, 0, BRW_SURFACEFORMAT_RAW,
>              brw->shader_time.bo->size, 1, true);
>        }
> -
> -      uint32_t *bind = brw_state_batch(brw, AUB_TRACE_BINDING_TABLE,
> -                                       prog_data->binding_table.size_bytes, 32,
> -                                       &stage_state->bind_bo_offset);
> -
> -      /* BRW_NEW_SURFACES and BRW_NEW_*_CONSTBUF */
> -      memcpy(bind, stage_state->surf_offset,
> -             prog_data->binding_table.size_bytes);
> +      /* When RS is enabled use hw-binding table uploads, otherwise fallback to
> +       * software-uploads.
> +       */
> +      if (brw->use_resource_streamer) {
> +         gen7_update_binding_table_from_array(brw, stage_state->stage,
> +                                              stage_state->surf_offset,
> +                                              prog_data->binding_table
> +                                              .size_bytes / 4);
> +      } else {
> +         uint32_t *bind = brw_state_batch(brw, AUB_TRACE_BINDING_TABLE,
> +                                          prog_data->binding_table.size_bytes,
> +                                          32,
> +                                          &stage_state->bind_bo_offset);
> +
> +         /* BRW_NEW_SURFACES and BRW_NEW_*_CONSTBUF */
> +         memcpy(bind, stage_state->surf_offset,
> +                prog_data->binding_table.size_bytes);
> +      }
>     }
>  
>     brw->ctx.NewDriverState |= brw_new_binding_table;
>  
>     if (brw->gen >= 7) {
> +      if (brw->use_resource_streamer) {
> +         stage_state->bind_bo_offset =
> +            reserve_hw_bt_space(brw, prog_data->binding_table.size_bytes);
> +      }
>        BEGIN_BATCH(2);
>        OUT_BATCH(packet_name << 16 | (2 - 2));
> -      OUT_BATCH(stage_state->bind_bo_offset);
> +      /* Align SurfaceStateOffset[16:6] format to [15:5] PS Binding Table field
> +       * when hw-generated binding table is enabled.
> +       */
> +      OUT_BATCH(brw->use_resource_streamer ?
> +                (stage_state->bind_bo_offset >> 1) :
> +                stage_state->bind_bo_offset);
>        ADVANCE_BATCH();
>     }
>  }
> 
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