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| author | Alex Elder <elder@linaro.org> | 2016-06-03 15:55:38 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@google.com> | 2016-06-03 17:03:23 -0700 |
| commit | 495787a792ac498843b25e5569597c24cd026f2b (patch) | |
| tree | 049c9b84a2d348b806e0d033df5f26320a70d481 /drivers/staging/greybus/hd.c | |
| parent | 79c8c6494220dafeaedf8dc94b50c9a787e25e5d (diff) | |
| download | op-kernel-dev-495787a792ac498843b25e5569597c24cd026f2b.zip op-kernel-dev-495787a792ac498843b25e5569597c24cd026f2b.tar.gz | |
greybus: tracing: add timing traces
Bryan reports he used certain message traces to determine when time
sync messages transit the boundary between the Greybus core and the
host device. This patch adds two trace events--one a message event
for outbound messages (because it indicates its operation and its
destination), and one host device event for incoming messages
(because message information isn't available as early as desired).
These events are being created to allow the same sort of analysis
of messages without having to store extra information for every
message trace. (The next patch changes the information a message
trace records.)
Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Diffstat (limited to 'drivers/staging/greybus/hd.c')
| -rw-r--r-- | drivers/staging/greybus/hd.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/staging/greybus/hd.c b/drivers/staging/greybus/hd.c index 12ac0b6..6d952ba 100644 --- a/drivers/staging/greybus/hd.c +++ b/drivers/staging/greybus/hd.c @@ -13,6 +13,9 @@ #include "greybus.h" #include "greybus_trace.h" +EXPORT_TRACEPOINT_SYMBOL_GPL(gb_message_submit); +EXPORT_TRACEPOINT_SYMBOL_GPL(gb_hd_in); + static struct ida gb_hd_bus_id_map; int gb_hd_output(struct gb_host_device *hd, void *req, u16 size, u8 cmd, |
