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Date: Thu, 13 Mar 2014 22:15:39 +0100
From: Wolfram Sang <wsa@the-dreams.de>
To: David Howells <dhowells@redhat.com>
Cc: wolfram@the-dreams.de, khali@linux-fr.org, linux-i2c@vger.kernel.org,
        rostedt@goodmis.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] i2c: Add message transfer tracepoints for SMBUS [ver
 #2]
Message-ID: <20140313211539.GB2696@katana>
References: <20140306133559.29345.61422.stgit@warthog.procyon.org.uk>
 <20140306133606.29345.97103.stgit@warthog.procyon.org.uk>
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On Thu, Mar 06, 2014 at 01:36:06PM +0000, David Howells wrote:
> The SMBUS tracepoints can be enabled thusly:
>=20
> 	echo 1 >/sys/kernel/debug/tracing/events/i2c/enable
>=20
> and will dump messages that can be viewed in /sys/kernel/debug/tracing/tr=
ace
> that look like:
>=20
>          ... smbus_read: i2c-0 a=3D051 f=3D0000 c=3Dfa BYTE_DATA
>          ... smbus_reply: i2c-0 a=3D051 f=3D0000 c=3Dfa BYTE_DATA l=3D1 [=
39]
>          ... smbus_result: i2c-0 a=3D051 f=3D0000 c=3Dfa BYTE_DATA rd res=
=3D0
>=20
> formatted as:
>=20
> 	i2c-<adapter-nr>
> 	a=3D<addr>
> 	f=3D<flags>
> 	c=3D<command>
> 	<protocol-name>
> 	<rd|wr>
> 	res=3D<result>
> 	l=3D<data-len>
> 	[<data-block>]
>=20
>=20
> The adapters to be traced can be selected by something like:
>=20
> 	echo adapter_nr=3D=3D1 >/sys/kernel/debug/tracing/events/i2c/filter
>=20
> Note that this shares the same filter and enablement as i2c.
>=20
> Signed-off-by: David Howells <dhowells@redhat.com>
> Reviewed-by: Steven Rostedt <rostedt@goodmis.org>

Applied to for-next, thanks!


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