[Mesa-dev] [PATCH 1/8] radv: don't flush src stages when dstStageMask == BOTTOM_OF_PIPE

[Fredrik Höglund]

The Vulkan specification says:

   "An execution dependency with only VK_PIPELINE_STAGE_BOTTOM_OF_-
    PIPE_BIT in the destination stage mask [...] does not delay
    processing of subsequent commands."

Cc: <mesa-stable at lists.freedesktop.org>
Signed-off-by: Fredrik Höglund <fredrik at kde.org>
---
 src/amd/vulkan/radv_cmd_buffer.c | 3 ++-
 src/amd/vulkan/radv_pass.c       | 6 ++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/amd/vulkan/radv_cmd_buffer.c b/src/amd/vulkan/radv_cmd_buffer.c
index 110a9a960a9..5bfcba28d83 100644
--- a/src/amd/vulkan/radv_cmd_buffer.c
+++ b/src/amd/vulkan/radv_cmd_buffer.c
@@ -4197,7 +4197,8 @@ void radv_CmdPipelineBarrier(
 		                                        image);
 	}
 
-	radv_stage_flush(cmd_buffer, srcStageMask);
+	if (destStageMask != VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT)
+		radv_stage_flush(cmd_buffer, srcStageMask);
 	cmd_buffer->state.flush_bits |= src_flush_bits;
 
 	for (uint32_t i = 0; i < imageMemoryBarrierCount; i++) {
diff --git a/src/amd/vulkan/radv_pass.c b/src/amd/vulkan/radv_pass.c
index 15fee444cdc..7a0dca09496 100644
--- a/src/amd/vulkan/radv_pass.c
+++ b/src/amd/vulkan/radv_pass.c
@@ -174,11 +174,13 @@ VkResult radv_CreateRenderPass(
 	for (unsigned i = 0; i < pCreateInfo->dependencyCount; ++i) {
 		uint32_t dst = pCreateInfo->pDependencies[i].dstSubpass;
 		if (dst == VK_SUBPASS_EXTERNAL) {
-			pass->end_barrier.src_stage_mask = pCreateInfo->pDependencies[i].srcStageMask;
+			if (pCreateInfo->pDependencies[i].dstStageMask != VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT)
+				pass->end_barrier.src_stage_mask = pCreateInfo->pDependencies[i].srcStageMask;
 			pass->end_barrier.src_access_mask = pCreateInfo->pDependencies[i].srcAccessMask;
 			pass->end_barrier.dst_access_mask = pCreateInfo->pDependencies[i].dstAccessMask;
 		} else {
-			pass->subpasses[dst].start_barrier.src_stage_mask = pCreateInfo->pDependencies[i].srcStageMask;
+			if (pCreateInfo->pDependencies[i].dstStageMask != VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT)
+				pass->subpasses[dst].start_barrier.src_stage_mask = pCreateInfo->pDependencies[i].srcStageMask;
 			pass->subpasses[dst].start_barrier.src_access_mask = pCreateInfo->pDependencies[i].srcAccessMask;
 			pass->subpasses[dst].start_barrier.dst_access_mask = pCreateInfo->pDependencies[i].dstAccessMask;
 		}
-- 
2.17.0