anv: Optimize genX(cmd_buffer_emit_gfx12_depth_wa)

Only emit the workaround as needed.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11454>

src/intel/vulkan/anv_private.h

@@ -2967,6 +2967,12 @@ struct anv_cmd_graphics_state {
    } gfx7;
 };
 
+enum anv_depth_reg_mode {
+   ANV_DEPTH_REG_MODE_UNKNOWN = 0,
+   ANV_DEPTH_REG_MODE_HW_DEFAULT,
+   ANV_DEPTH_REG_MODE_D16,
+};
+
 /** State tracking for compute pipeline
  *
  * This has anv_cmd_pipeline_state as a base struct to track things which get
@@ -3043,6 +3049,13 @@ struct anv_cmd_state {
     */
    bool                                         hiz_enabled;
 
+   /* We ensure the registers for the gfx12 D16 fix are initalized at the
+    * first non-NULL depth stencil packet emission of every command buffer.
+    * For secondary command buffer execution, we transfer the state from the
+    * last command buffer to the primary (if known).
+    */
+   enum anv_depth_reg_mode                      depth_reg_mode;
+
    bool                                         conditional_render_enabled;
 
    /**

src/intel/vulkan/genX_cmd_buffer.c

@@ -2004,6 +2004,11 @@ genX(CmdExecuteCommands)(
              secondary->perf_query_pool == primary->perf_query_pool);
       if (secondary->perf_query_pool)
          primary->perf_query_pool = secondary->perf_query_pool;
+
+#if GFX_VERx10 == 120
+      if (secondary->state.depth_reg_mode != ANV_DEPTH_REG_MODE_UNKNOWN)
+         primary->state.depth_reg_mode = secondary->state.depth_reg_mode;
+#endif
    }
 
    /* The secondary isn't counted in our VF cache tracking so we need to
@@ -5534,6 +5539,19 @@ genX(cmd_buffer_emit_gfx12_depth_wa)(struct anv_cmd_buffer *cmd_buffer,
 #if GFX_VERx10 == 120
    const bool fmt_is_d16 = surf->format == ISL_FORMAT_R16_UNORM;
 
+   switch (cmd_buffer->state.depth_reg_mode) {
+   case ANV_DEPTH_REG_MODE_HW_DEFAULT:
+      if (!fmt_is_d16)
+         return;
+      break;
+   case ANV_DEPTH_REG_MODE_D16:
+      if (fmt_is_d16)
+         return;
+      break;
+   case ANV_DEPTH_REG_MODE_UNKNOWN:
+      break;
+   }
+
    /* We'll change some CHICKEN registers depending on the depth surface
     * format. Do a depth flush and stall so the pipeline is not using these
     * settings while we change the registers.
@@ -5563,6 +5581,9 @@ genX(cmd_buffer_emit_gfx12_depth_wa)(struct anv_cmd_buffer *cmd_buffer,
       reg.HZDepthTestLEGEOptimizationDisable = fmt_is_d16;
       reg.HZDepthTestLEGEOptimizationDisableMask = true;
    }
+
+   cmd_buffer->state.depth_reg_mode =
+      fmt_is_d16 ? ANV_DEPTH_REG_MODE_D16 : ANV_DEPTH_REG_MODE_HW_DEFAULT;
 #endif
 }