linux-kernel - Re: [RFC PATCH 5/6] firmware: arm_scmi: Add raw transmission support

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Message-ID: <Yvvb6Y+lzuABT1fy@sirena.org.uk>
Date:   Tue, 16 Aug 2022 19:03:21 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Cristian Marussi <cristian.marussi@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        sudeep.holla@....com, james.quinlan@...adcom.com,
        Jonathan.Cameron@...wei.com, f.fainelli@...il.com,
        etienne.carriere@...aro.org, vincent.guittot@...aro.org,
        souvik.chakravarty@....com, wleavitt@...vell.com,
        peter.hilber@...nsynergy.com, nicola.mazzucato@....com,
        tarek.el-sherbiny@....com
Subject: Re: [RFC PATCH 5/6] firmware: arm_scmi: Add raw transmission support

On Tue, Aug 16, 2022 at 08:24:49AM +0100, Cristian Marussi wrote:
> Add SCMI Raw mode support which exposes a userspace interface rooted under
> /sys/kernel/debug/scmi_raw.

> Raw mode can be enabled/disabled at runtime via ./scmi_raw/enable.
> Once enabled, all the regular SCMI drivers activity is inhibited and a
> userspace application can then inject and read back bare SCMI messages
> writing and reading to/from ./scmi_raw/message* entries.

Is there a strong reason to have the runtime enable/disable?  Given that
this is going to be used in special kernel builds rather than something
people have as standard it feels like the transition to/from raw mode is
opening up a set of extra use cases that wouldn't normally come up for
the SCMI drivers (especially if the testing ends up leaving the firmware
in a weird state).

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