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. [0] https://github.com/mikesart/gpuvis/issues/30 Signed-off-by: Heinrich <heinrich.f...@daqri.com> --- drivers/gpu/drm/drm_trace.h | 14 ++++++++++---- 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 baccc63db106..45f21d7fcfa1 100644 --- a/drivers/gpu/drm/drm_trace.h +++ b/drivers/gpu/drm/drm_trace.h @@ -11,17 +11,23 @@ #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 a1b65d26d761..fb089a88b516 100644 --- a/drivers/gpu/drm/drm_vblank.c +++ b/drivers/gpu/drm/drm_vblank.c @@ -1706,7 +1706,8 @@ 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); } /** -- 2.23.0.rc1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
