netdev - Re: [PATCH 2/4] soc: qcom: aoss: Add debugfs interface for sending messages

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Date: Mon, 31 Jul 2023 10:21:31 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Bjorn Andersson <quic_bjorande@...cinc.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Chris Lew <quic_clew@...cinc.com>, Alex Elder <elder@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH 2/4] soc: qcom: aoss: Add debugfs interface for sending
 messages

On Sun, Jul 30, 2023 at 09:10:11PM -0700, Bjorn Andersson wrote:
> From: Chris Lew <clew@...eaurora.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