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

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Message-ID: <555E3466.4050403@codeaurora.org>
Date:	Thu, 21 May 2015 12:39:18 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	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
CC:	linux-kernel@...r.kernel.org, svarbanov@...sol.com,
	galak@...eaurora.org, agross@...eaurora.org
Subject: Re: [PATCH] spmi: add command tracepoints for SPMI

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>
> ---

Assuming you fix sign-off-chain:

Reviewed-by: Stephen Boyd <sboyd@...eaurora.org>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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