[Mesa-dev] [PATCH] anv: Allow PMA optimization to enabled in secondary command buffers

[Alex Smith]

This was never enabled in secondary buffers because hiz_enabled was
never set to true for those.

If the app provides a framebuffer in the inheritance info when beginning
a secondary buffer, we can determine if HiZ is enabled and therefore
allow the PMA optimization to be enabled within the command buffer.

This improves performance by ~13% on an internal benchmark on Skylake.

Signed-off-by: Alex Smith <asmith at feralinteractive.com>
---
 src/intel/vulkan/genX_cmd_buffer.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/intel/vulkan/genX_cmd_buffer.c b/src/intel/vulkan/genX_cmd_buffer.c
index 0bd3874db7..2036151249 100644
--- a/src/intel/vulkan/genX_cmd_buffer.c
+++ b/src/intel/vulkan/genX_cmd_buffer.c
@@ -977,11 +977,31 @@ genX(BeginCommandBuffer)(
          anv_render_pass_from_handle(pBeginInfo->pInheritanceInfo->renderPass);
       cmd_buffer->state.subpass =
          &cmd_buffer->state.pass->subpasses[pBeginInfo->pInheritanceInfo->subpass];
-      cmd_buffer->state.framebuffer = NULL;
+
+      /* This is optional in the inheritance info. */
+      cmd_buffer->state.framebuffer =
+         anv_framebuffer_from_handle(pBeginInfo->pInheritanceInfo->framebuffer);
 
       result = genX(cmd_buffer_setup_attachments)(cmd_buffer,
                                                   cmd_buffer->state.pass, NULL);
 
+      /* Record that HiZ is enabled if we can. */
+      if (cmd_buffer->state.framebuffer) {
+         const VkAttachmentReference * const ds =
+            &cmd_buffer->state.subpass->depth_stencil_attachment;
+
+         if (ds->attachment != VK_ATTACHMENT_UNUSED) {
+            const struct anv_image_view * const iview =
+               cmd_buffer->state.framebuffer->attachments[ds->attachment];
+            const struct anv_image * const image = iview->image;
+            enum isl_aux_usage aux_usage =
+               anv_layout_to_aux_usage(&cmd_buffer->device->info, image,
+                                       VK_IMAGE_ASPECT_DEPTH_BIT, ds->layout);
+
+            cmd_buffer->state.hiz_enabled = aux_usage == ISL_AUX_USAGE_HIZ;
+         }
+      }
+
       cmd_buffer->state.dirty |= ANV_CMD_DIRTY_RENDER_TARGETS;
    }
 
-- 
2.13.6