From: Bjorn Andersson <andersson@kernel.org>
To: Souradeep Chowdhury <quic_schowdhu@quicinc.com>
Cc: Andy Gross <agross@kernel.org>,
Konrad Dybcio <konrad.dybcio@somainline.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Rob Herring <robh+dt@kernel.org>, Alex Elder <elder@ieee.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
devicetree@vger.kernel.org,
Sai Prakash Ranjan <quic_saipraka@quicinc.com>,
Sibi Sankar <quic_sibis@quicinc.com>,
Rajendra Nayak <quic_rjendra@quicinc.com>,
vkoul@kernel.org
Subject: Re: [PATCH V21 2/7] soc: qcom: dcc: Add driver support for Data Capture and Compare unit(DCC)
Date: Wed, 28 Dec 2022 11:28:25 -0600 [thread overview]
Message-ID: <20221228172825.r32vpphbdulaldvv@builder.lan> (raw)
In-Reply-To: <644b4f66a358492a8a6738454035c3b120092fe7.1672148732.git.quic_schowdhu@quicinc.com>
On Tue, Dec 27, 2022 at 08:52:46PM +0530, Souradeep Chowdhury wrote:
> The DCC is a DMA Engine designed to capture and store data
> during system crash or software triggers. The DCC operates
> based on user inputs via the debugfs interface. The user gives
> addresses as inputs and these addresses are stored in the
> dcc sram. In case of a system crash or a manual software
> trigger by the user through the debugfs interface,
> the dcc captures and stores the values at these addresses.
> This patch contains the driver which has all the methods
> pertaining to the debugfs interface, auxiliary functions to
> support all the four fundamental operations of dcc namely
> read, write, read/modify/write and loop. The probe method
> here instantiates all the resources necessary for dcc to
> operate mainly the dedicated dcc sram where it stores the
> values. The DCC driver can be used for debugging purposes
> without going for a reboot since it can perform software
> triggers as well based on user inputs.
>
> Also add the documentation for debugfs entries which explains
> the functionalities of each debugfs file that has been created
> for dcc.
>
> The following is the justification of using debugfs interface
> over the other alternatives like sysfs/ioctls
>
> i) As can be seen from the debugfs attribute descriptions,
> some of the debugfs attribute files here contains multiple
> arguments which needs to be accepted from the user. This goes
> against the design style of sysfs.
>
> ii) The user input patterns have been made simple and convenient
> in this case with the use of debugfs interface as user doesn't
> need to shuffle between different files to execute one instruction
> as was the case on using other alternatives.
>
I would have preferred to get some more input from users of the debugfs
interface, but it's after all not ABI. So let's get this merged and
if people has concerns/objections/suggestions we'll improve it as
necessary.
Thanks for pushing this Souradeep!
> Signed-off-by: Souradeep Chowdhury <quic_schowdhu@quicinc.com>
> Reviewed-by: Alex Elder <elder@linaro.org>
Thanks Alex.
Regards,
Bjorn
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next prev parent reply other threads:[~2022-12-28 17:29 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-27 15:22 [PATCH V21 0/7] soc: qcom: dcc: Add driver support for Data Capture and Compare unit(DCC) Souradeep Chowdhury
2022-12-27 15:22 ` [PATCH V21 1/7] dt-bindings: soc: qcom,dcc: Add the dtschema Souradeep Chowdhury
2022-12-27 15:22 ` [PATCH V21 2/7] soc: qcom: dcc: Add driver support for Data Capture and Compare unit(DCC) Souradeep Chowdhury
2022-12-28 17:28 ` Bjorn Andersson [this message]
2022-12-27 15:22 ` [PATCH V21 3/7] MAINTAINERS: Add the entry for DCC(Data Capture and Compare) driver support Souradeep Chowdhury
2022-12-27 15:22 ` [PATCH V21 4/7] arm64: dts: qcom: sm8150: Add Data Capture and Compare(DCC) support node Souradeep Chowdhury
2022-12-27 15:22 ` [PATCH V21 5/7] arm64: dts: qcom: sc7280: " Souradeep Chowdhury
2022-12-27 15:22 ` [PATCH V21 6/7] arm64: dts: qcom: sc7180: " Souradeep Chowdhury
2022-12-27 15:22 ` [PATCH V21 7/7] arm64: dts: qcom: sdm845: " Souradeep Chowdhury
2022-12-28 18:13 ` (subset) [PATCH V21 0/7] soc: qcom: dcc: Add driver support for Data Capture and Compare unit(DCC) Bjorn Andersson
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