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d714fb25e7
linux/include/trace
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Jae Hyun Yoo d714fb25e7 i2c: add tracepoints for I2C slave events 
I2C slave events tracepoints can be enabled by:

	echo 1 > /sys/kernel/tracing/events/i2c_slave/enable

and logs in /sys/kernel/tracing/trace will look like:

	... i2c_slave: i2c-0 a=010 ret=0 WR_REQ []
	... i2c_slave: i2c-0 a=010 ret=0 WR_RCV [02]
	... i2c_slave: i2c-0 a=010 ret=0 WR_RCV [0c]
	... i2c_slave: i2c-0 a=010 ret=0   STOP []
	... i2c_slave: i2c-0 a=010 ret=0 RD_REQ [04]
	... i2c_slave: i2c-0 a=010 ret=0 RD_PRO [b4]
	... i2c_slave: i2c-0 a=010 ret=0  STOP []

formatted as:

	i2c-<adapter_nr>
	a=<addr>
	ret=<ret>	<- callback return value
	<event>
	[<data>]

trace printings can be selected by adding a filter like:

	echo adapter_nr==1 >/sys/kernel/tracing/events/i2c_slave/filter

Signed-off-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-03-20 00:11:05 +01:00
..
events i2c: add tracepoints for I2C slave events 2022-03-20 00:11:05 +01:00
bpf_probe.h tracing: Add '__rel_loc' using trace event macros 2021-12-06 15:37:21 -05:00
define_trace.h tracepoint: Optimize using static_call() 2020-09-01 09:58:06 +02:00
perf.h tracing/perf: Avoid -Warray-bounds warning for __rel_loc macro 2022-01-27 19:15:45 -05:00
syscall.h tracepoints: Migrate to use SYSCALL_WORK flag 2020-11-16 21:53:15 +01:00
trace_events.h tracing/perf: Avoid -Warray-bounds warning for __rel_loc macro 2022-01-27 19:15:45 -05:00