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]
Date: Thu, 13 Mar 2014 22:15:39 +0100 [thread overview]
Message-ID: <20140313211539.GB2696@katana> (raw)
In-Reply-To: <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:
>
> echo 1 >/sys/kernel/debug/tracing/events/i2c/enable
>
> and will dump messages that can be viewed in /sys/kernel/debug/tracing/trace
> that look like:
>
> ... smbus_read: i2c-0 a=051 f=0000 c=fa BYTE_DATA
> ... smbus_reply: i2c-0 a=051 f=0000 c=fa BYTE_DATA l=1 [39]
> ... smbus_result: i2c-0 a=051 f=0000 c=fa BYTE_DATA rd res=0
>
> formatted as:
>
> i2c-<adapter-nr>
> a=<addr>
> f=<flags>
> c=<command>
> <protocol-name>
> <rd|wr>
> res=<result>
> l=<data-len>
> [<data-block>]
>
>
> The adapters to be traced can be selected by something like:
>
> echo adapter_nr==1 >/sys/kernel/debug/tracing/events/i2c/filter
>
> Note that this shares the same filter and enablement as i2c.
>
> Signed-off-by: David Howells <dhowells@redhat.com>
> Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Applied to for-next, thanks!
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next prev parent reply other threads:[~2014-03-13 21:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-06 13:35 [PATCH 1/2] i2c: Add message transfer tracepoints for I2C [ver #2] David Howells
2014-03-06 13:36 ` [PATCH 2/2] i2c: Add message transfer tracepoints for SMBUS " David Howells
2014-03-13 21:15 ` Wolfram Sang [this message]
2014-03-13 21:15 ` [PATCH 1/2] i2c: Add message transfer tracepoints for I2C " Wolfram Sang
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