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@xxxxxxxxxx> > Reviewed-by: Steven Rostedt <rostedt@xxxxxxxxxxx> Applied to for-next, thanks!
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