Mesa (master): radeonsi: make si_fence_server_signal flush pipe without work

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Module: Mesa
Branch: master
Commit: 0660cbf4262891e6380faf0d99217b2d27873051
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=0660cbf4262891e6380faf0d99217b2d27873051

Author: Peng Huang <shawn.p.huang at gmail.com>
Date:   Sat Feb  1 22:31:00 2020 -0500

radeonsi: make si_fence_server_signal flush pipe without work

glSignalSemaphoreEXT sometime doesn't signal the semaphore, it is
because radeonsi doesn't flush if gl context doesn't have pending
work. Fix the porblem by always submit ib.

Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Cc: 19.3 20.0 <mesa-stable at lists.freedesktop.org>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3779>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3779>

---

 src/gallium/drivers/radeonsi/si_fence.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gallium/drivers/radeonsi/si_fence.c b/src/gallium/drivers/radeonsi/si_fence.c
index e9dd3e937f2..26b5fc4bdba 100644
--- a/src/gallium/drivers/radeonsi/si_fence.c
+++ b/src/gallium/drivers/radeonsi/si_fence.c
@@ -606,7 +606,11 @@ static void si_fence_server_signal(struct pipe_context *ctx,
 	 * Therefore, we must make sure that we flush the pipe to avoid
 	 * new work being emitted and getting executed before the signal
 	 * operation.
+	 * 
+	 * Set sctx->initial_gfx_cs_size to force IB submission even if
+	 * it is empty.
 	 */
+	sctx->initial_gfx_cs_size = 0;
 	si_flush_from_st(ctx, NULL, PIPE_FLUSH_ASYNC);
 }