[RFC,07/17] drm/amdgpu: add dma-fence annotations to atomic commit path

Commit Message

Daniel Vetter May 12, 2020, 8:59 a.m. UTC

I need a canary in a ttm-based atomic driver to make sure the
dma_fence_begin/end_signalling annotations actually work.

Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: Chris Wilson <[e-mail]>
Cc: Maarten Lankhorst <[e-mail]>
Cc: Christian König <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 6 ++++++
 1 file changed, 6 insertions(+)

Patch

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index ea0e039a667a..4469a8c96b08 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -57,6 +57,7 @@ 
 
 #include "ivsrcid/ivsrcid_vislands30.h"
 
+#include <linux/module.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/version.h>
@@ -7109,6 +7110,9 @@  static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 	struct drm_connector_state *old_con_state, *new_con_state;
 	struct dm_crtc_state *dm_old_crtc_state, *dm_new_crtc_state;
 	int crtc_disable_count = 0;
+	bool fence_cookie;
+
+	fence_cookie = dma_fence_begin_signalling();
 
 	drm_atomic_helper_update_legacy_modeset_state(dev, state);
 
@@ -7389,6 +7393,8 @@  static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 	/* Signal HW programming completion */
 	drm_atomic_helper_commit_hw_done(state);
 
+	dma_fence_end_signalling(fence_cookie);
+
 	if (wait_for_vblank)
 		drm_atomic_helper_wait_for_flip_done(dev, state);