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Date:   Mon, 31 Jul 2023 10:21:31 +0200
From:   Andrew Lunn <andrew@lunn.ch>
To:     Bjorn Andersson <quic_bjorande@quicinc.com>
Cc:     Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Chris Lew <quic_clew@quicinc.com>,
        Alex Elder <elder@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org
Subject: Re: [PATCH 2/4] soc: qcom: aoss: Add debugfs interface for sending
 messages
Message-ID: <21dfb855-8f44-4a4c-9dba-52eb5ae46b9b@lunn.ch>
References: <20230731041013.2950307-1-quic_bjorande@quicinc.com>
 <20230731041013.2950307-3-quic_bjorande@quicinc.com>
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On Sun, Jul 30, 2023 at 09:10:11PM -0700, Bjorn Andersson wrote:
> From: Chris Lew <clew@codeaurora.org>
> 
> In addition to the normal runtime commands, the Always On Processor
> (AOP) provides a number of debug commands which can be used during
> system debugging for things such as preventing power collapse or placing
> floor votes for certain resources. Some of these are documented in the
> Robotics RB5 "Debug AOP ADB" linked below.
> 
> Provide a debugfs interface for the developer/tester to send these
> commands to the AOP.

This sort of sending arbitrary binary blob commands is not liked,
since it allow user space closed source drivers. At minimum, please
provide a file per command, with the kernel marshalling parameters
into the binary format, and decoding any returned values.

       Andrew