linux-kernel - Re: [PATCH] spmi: add command tracepoints for SPMI

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Date:	Tue, 19 May 2015 22:47:01 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Ankit Gupta <ankgupta@...eaurora.org>, gavidov@...eaurora.org,
	sdharia@...eaurora.org, mlocke@...eaurora.org,
	linux-arm-msm@...r.kernel.org, gregkh@...uxfoundation.org,
	ivan.ivanov@...aro.org, linux-kernel@...r.kernel.org,
	svarbanov@...sol.com, galak@...eaurora.org, agross@...eaurora.org
Subject: Re: [PATCH] spmi: add command tracepoints for SPMI

On Tue, 19 May 2015 17:36:41 -0700
Stephen Boyd <sboyd@...eaurora.org> wrote:

> +Steven Rostedt
> 
> On 05/18/15 14:51, Ankit Gupta wrote:
> > Add tracepoints to retrieve information about read, write
> > and non-data commands. For performance measurement support
> > tracepoints are added at the beginning and at the end of
> > transfers. Following is a list showing the new tracepoint
> > events. The "cmd" parameter here represents the opcode, SID,
> > and full 16-bit address.
> >
> > spmi_write_begin: cmd and data buffer.
> > spmi_write_end  : cmd and return value.
> > spmi_read_begin : cmd.
> > spmi_read_end   : cmd, return value and data buffer.
> > spmi_cmd        : cmd.
> >
> > The reason that cmd appears at both the beginning and at
> > the end event is that SPMI drivers can request commands
> > concurrently. cmd helps in matching the corresponding
> > events.
> >
> > SPMI tracepoints can be enabled like:
> >
> > echo 1 >/sys/kernel/debug/tracing/events/spmi/enable
> >
> > and will dump messages that can be viewed in
> > /sys/kernel/debug/tracing/trace that look like:
> >
> > ... spmi_read_begin: opc=56 sid=00 addr=0x0000
> > ... spmi_read_end: opc=56 sid=00 addr=0x0000 ret=0 len=02 buf=0x[01-40]
> > ... spmi_write_begin: opc=48 sid=00 addr=0x0000 len=3 buf=0x[ff-ff-ff]
> >
> > Signed-off-by: Ankit Gupta <ankgupta@...eaurora.org>
> > Signed-off-by: Gilad Avidov <gavidov@...eaurora.org>
> > Suggested-by: Sagar Dharia <sdharia@...eaurora.org>
> > ---
> 
> Your Signed-off-by should be last.
> 

The tracing part looks fine to me. For that:

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve

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