linux-kernel - Re: [PATCH V4 18/20] rv/monitor: Add safe watchdog monitor

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Date:   Wed, 13 Jul 2022 21:13:35 +0200
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Jonathan Corbet <corbet@....net>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Gabriele Paoloni <gpaoloni@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-trace-devel@...r.kernel.org
Subject: Re: [PATCH V4 18/20] rv/monitor: Add safe watchdog monitor

On 6/16/22 10:45, Daniel Bristot de Oliveira wrote:
> The watchdog is an essential building block for the usage of Linux in
> safety-critical systems because it allows the system to be monitored from
> an external element - the watchdog hardware, acting as a safety-monitor.

Guenter and Steven,

I will move the watchdog monitor to a separated thread, as it will require
further discussions specific to it, mainly to get feedback from watchdog
maintainers.

Anyways, I am adding additional information for the sample monitors based on our
discussions here.

They are:

I added documentation about the automata format and the translation between
the formal <-> dot -> C.

I am adding the .dot file to the tools/verification/models/ so that one can get
the .dot file and convert it to other formats, like, a png file. This
will make it easy to read the automata model.

I am adding a .rst documentation for each model, including details about it.

I will send the v5 of RV without the safe_wtd monitor and then start a new
one about the watchdog later, after getting the RV interface series ready.

-- Daniel