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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
This commit is contained in:
Heinrich Fink 2019-09-02 16:24:12 +02:00 committed by Daniel Vetter
parent acff2f86b1
commit 6914f8eb64
2 changed files with 12 additions and 5 deletions
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14
drivers/gpu/drm/drm_trace.h
View File

@ -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,

3
drivers/gpu/drm/drm_vblank.c
View File

@ -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);
}
/**