linux-kernel - Re: [PATCH v3] i2c: add tracepoints for I2C slave events

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Message-ID: <YjZkFrPTW6sR6ATX@shikoro>
Date:   Sun, 20 Mar 2022 00:15:34 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Jae Hyun Yoo <quic_jaehyoo@...cinc.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        Graeme Gregory <quic_ggregory@...cinc.com>,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH v3] i2c: add tracepoints for I2C slave events

On Fri, Mar 18, 2022 at 01:41:33PM -0700, Jae Hyun Yoo wrote:
> 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@...cinc.com>

Applied to for-next, thanks!


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