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greybus: operation, core: hook tracepoints into message opertions

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This patch hooks tracepoints for greybus messages

- trace_gb_message_send
- trace_gb_message_recv_request
- trace_gb_message_recv_response
- trace_gb_message_cancel_outgoing
- trace_gb_message_cancel_incoming

It provides standard tracepoints at

/sys/kernel/debug/tracing/events/greybus/gb_message_send
/sys/kernel/debug/tracing/events/greybus/gb_message_recv_response
/sys/kernel/debug/tracing/events/greybus/gb_message_recv_request
/sys/kernel/debug/tracing/events/greybus/gb_message_cancel_outgoing
/sys/kernel/debug/tracing/events/greybus/gb_message_cancel_incoming

Giving outputs like

gb_message_recv_request: greybus:1-1.1:0 op=0001 if_id=0000 hd_id=0000 l=2
gb_message_send: greybus:1-1.1:0 op=0001 if_id=0000 hd_id=0000 l=2

Similarly perf events can be viewed with standard perf tools e.g.

root@beaglebone:~# perf list 'greybus:*'
  greybus:gb_message_send                            [Tracepoint event]
  greybus:gb_message_recv_request                    [Tracepoint event]
  greybus:gb_message_recv_response                   [Tracepoint event]
  greybus:gb_message_cancel_outgoing                 [Tracepoint event]
  greybus:gb_message_cancel_incoming                 [Tracepoint event]

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Bryan O'Donoghue 2015-09-18 16:38:45 +01:00 • committed by Greg Kroah-Hartman
commit 5c8ad599b9
3 changed files with 12 additions and 0 deletions
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