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| author | David Howells <dhowells@redhat.com> | 2014-03-06 13:36:06 +0000 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-03-13 22:15:07 +0100 |
| commit | 8a325997d95d446206b204b7859e055a0315e4fa (patch) | |
| tree | c14cb0b0af6cd80229a6fea12b0b5ca76a1ecaac /README | |
| parent | d9a83d62b326574fb4831b64317a82a42642a9a2 (diff) | |
| download | linux-8a325997d95d446206b204b7859e055a0315e4fa.tar.bz2 | |
i2c: Add message transfer tracepoints for SMBUS [ver #2]
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>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions