radeonsi: implement semaphore_server_signal v2

Syncobj based waits or signals only happen at submission boundaries. In
order to guarantee that the requested signal event will occur when the
state tracker requested it, we must issue a flush.

v2: s/fence/semaphore for pipe objects

Signed-off-by: Andres Rodriguez <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/gallium/drivers/radeonsi/si_fence.c b/src/gallium/drivers/radeonsi/si_fence.c
index ef80b38aa67..cce9a3302ab 100644
--- a/src/gallium/drivers/radeonsi/si_fence.c
+++ b/src/gallium/drivers/radeonsi/si_fence.c
@@ -63,6 +63,14 @@ static void si_add_fence_dependency(struct r600_common_context *rctx,
 	ws->cs_add_fence_dependency(rctx->gfx.cs, fence);
 }
 
+static void si_add_syncobj_signal(struct r600_common_context *rctx,
+				  struct pipe_fence_handle *fence)
+{
+	struct radeon_winsys *ws = rctx->ws;
+
+	ws->cs_add_syncobj_signal(rctx->gfx.cs, fence);
+}
+
 static void si_fence_reference(struct pipe_screen *screen,
 			       struct pipe_fence_handle **dst,
 			       struct pipe_fence_handle *src)
@@ -480,11 +488,40 @@ finish:
 	}
 }
 
+static void si_fence_server_signal(struct pipe_context *ctx,
+				   struct pipe_fence_handle *fence)
+{
+	struct r600_common_context *rctx = (struct r600_common_context *)ctx;
+	struct si_multi_fence *rfence = (struct si_multi_fence *)fence;
+
+	/* We should have at least one syncobj to signal */
+	assert(rfence->sdma || rfence->gfx);
+
+	if (rfence->sdma)
+		si_add_syncobj_signal(rctx, rfence->sdma);
+	if (rfence->gfx)
+		si_add_syncobj_signal(rctx, rfence->gfx);
+
+	/**
+	 * The spec does not require a flush here. We insert a flush
+	 * because syncobj based signals are not directly placed into
+	 * the command stream. Instead the signal happens when the
+	 * submission associated with the syncobj finishes execution.
+	 *
+	 * Therefore, we must make sure that we flush the pipe to avoid
+	 * new work being emitted and getting executed before the signal
+	 * operation.
+	 */
+	si_flush_from_st(ctx, NULL, PIPE_FLUSH_ASYNC);
+}
+
+
 void si_init_fence_functions(struct si_context *ctx)
 {
 	ctx->b.b.flush = si_flush_from_st;
 	ctx->b.b.create_fence_fd = si_create_fence_fd;
 	ctx->b.b.fence_server_sync = si_fence_server_sync;
+	ctx->b.b.fence_server_signal = si_fence_server_signal;
 }
 
 void si_init_screen_fence_functions(struct si_screen *screen)