diff options
| author | Heinrich Fink <heinrich.fink@daqri.com> | 2019-09-02 17:24:12 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2019-09-03 10:46:18 +0300 |
| commit | 6914f8eb64f9de5308e2968968145cf6eb304025 (patch) | |
| tree | 34f1a12e9232b2fe5a76f7e80c04b35e0b464489 | |
| parent | acff2f86b195653a9487fe3dbdbc821d77eff54a (diff) | |
| download | linux-6914f8eb64f9de5308e2968968145cf6eb304025.tar.xz | |
drm: Add high-precision time to vblank trace event
Store the timestamp of the current vblank in the new field 'time' of the
vblank trace event. If the timestamp is calculated by a driver that
supports high-precision vblank timing, set the field 'high-prec' to
'true'.
User space can now access actual hardware vblank times via the tracing
infrastructure. Tracing applications (such as GPUVis, see [0] for
related discussion), can use the newly added information to conduct a
more accurate analysis of display timing.
v2 Fix author name (missing last name)
[0] https://github.com/mikesart/gpuvis/issues/30
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Heinrich Fink <heinrich.fink@daqri.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190902142412.27846-2-heinrich.fink@daqri.com
| -rw-r--r-- | drivers/gpu/drm/drm_trace.h | 14 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_vblank.c | 3 |
2 files changed, 12 insertions, 5 deletions
diff --git a/drivers/gpu/drm/drm_trace.h b/drivers/gpu/drm/drm_trace.h index 471eb927474b..11c6dd577e8e 100644 --- a/drivers/gpu/drm/drm_trace.h +++ b/drivers/gpu/drm/drm_trace.h @@ -13,17 +13,23 @@ struct drm_file; #define TRACE_INCLUDE_FILE drm_trace TRACE_EVENT(drm_vblank_event, - TP_PROTO(int crtc, unsigned int seq), - TP_ARGS(crtc, seq), + TP_PROTO(int crtc, unsigned int seq, ktime_t time, bool high_prec), + TP_ARGS(crtc, seq, time, high_prec), TP_STRUCT__entry( __field(int, crtc) __field(unsigned int, seq) + __field(ktime_t, time) + __field(bool, high_prec) ), TP_fast_assign( __entry->crtc = crtc; __entry->seq = seq; - ), - TP_printk("crtc=%d, seq=%u", __entry->crtc, __entry->seq) + __entry->time = time; + __entry->high_prec = high_prec; + ), + TP_printk("crtc=%d, seq=%u, time=%lld, high-prec=%s", + __entry->crtc, __entry->seq, __entry->time, + __entry->high_prec ? "true" : "false") ); TRACE_EVENT(drm_vblank_event_queued, diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c index fd1fbc77871f..c99feda25dea 100644 --- a/drivers/gpu/drm/drm_vblank.c +++ b/drivers/gpu/drm/drm_vblank.c @@ -1731,7 +1731,8 @@ static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) send_vblank_event(dev, e, seq, now); } - trace_drm_vblank_event(pipe, seq); + trace_drm_vblank_event(pipe, seq, now, + dev->driver->get_vblank_timestamp != NULL); } /** |