From: "Ankit Gupta" <ankgupta@codeaurora.org>
To: "Stephen Boyd" <sboyd@codeaurora.org>
Cc: "Ankit Gupta" <ankgupta@codeaurora.org>,
gavidov@codeaurora.org, sdharia@codeaurora.org,
mlocke@codeaurora.org, linux-arm-msm@vger.kernel.org,
gregkh@linuxfoundation.org, ivan.ivanov@linaro.org,
linux-kernel@vger.kernel.org, svarbanov@mm-sol.com,
galak@codeaurora.org, agross@codeaurora.org
Subject: Re: [PATCH] spmi: add command tracepoints for SPMI
Date: Thu, 21 May 2015 17:24:09 -0600 [thread overview]
Message-ID: <1ae9ad74d48d03a477ae6ffca028a5d3.squirrel@www.codeaurora.org> (raw)
In-Reply-To: <555E3466.4050403@codeaurora.org>
> 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@codeaurora.org>
>> Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>
>> Suggested-by: Sagar Dharia <sdharia@codeaurora.org>
>> ---
>
> Assuming you fix sign-off-chain:
>
> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Sorry, Missed your this email, will upload a new patch with just change of
sign-off order.
Thanks
>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
>
prev parent reply other threads:[~2015-05-21 23:24 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-18 21:51 [PATCH] spmi: add command tracepoints for SPMI Ankit Gupta
2015-05-20 0:36 ` Stephen Boyd
2015-05-20 2:47 ` Steven Rostedt
2015-05-20 15:08 ` Ankit Gupta
2015-05-20 18:29 ` Stephen Boyd
2015-05-20 18:58 ` Steven Rostedt
2015-05-21 19:37 ` Stephen Boyd
2015-05-21 20:26 ` Ankit Gupta
2015-05-21 19:39 ` Stephen Boyd
2015-05-21 23:24 ` Ankit Gupta [this message]
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