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References: <20220630173135.2086631-1-cristian.marussi@arm.com> <20220701135411.eeruvjuispgfuyls@bogus>
In-Reply-To: <20220701135411.eeruvjuispgfuyls@bogus>
From:   Jim Quinlan <james.quinlan@broadcom.com>
Date:   Fri, 1 Jul 2022 11:03:38 -0400
Message-ID: <CA+-6iNz2rORXE2u0EZOS9cnUBAXR_pyvcNKAMQjOf_gpRYyqsw@mail.gmail.com>
Subject: Re: [PATCH v2 0/2] Add SCMI full message tracing
To:     Sudeep Holla <sudeep.holla@arm.com>
Cc:     Cristian Marussi <cristian.marussi@arm.com>,
        open list <linux-kernel@vger.kernel.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Lukasz Luba <lukasz.luba@arm.com>
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Hi,
LGTM, I appreciate this change. For testing, I fed  your sample output to this:

     perl -MData::Dumper -nae  's/^.+scmi_msg_dump:// && print Dumper
{ (map { split /=/; } split" ") }' < scmi.txt

which gives this

$VAR1 = {
          'pt' => '15',
          'seq' => '0000',
          'pyld' =>
'000000000800000009daffffffffffff008268d4c075fd1611daffffffffffff008268d4c075fd1619daffffffffffff008268d4c075fd16',
          'msg_id' => '01',
          's' => '0',
          't' => 'NOTI'
        };
which is what I wanted.   BTW, if I ever write a script that would
take this SCMI trace text and
decode it to nice cmd names and arguments -- where would I submit such a script?

Thanks and Regards,
Jim Quinlan
Broadcom STB


On Fri, Jul 1, 2022 at 9:54 AM Sudeep Holla <sudeep.holla@arm.com> wrote:
>
> On Thu, Jun 30, 2022 at 06:31:33PM +0100, Cristian Marussi wrote:
> > Hi,
> >
> > after a few recent troubles handling too strictly out-of-spec replies from
> > SCMI servers deployed in the wild, I though it could have been useful to
> > have a basic way to dump at will the effective full payloads of
> > successfully transmitted/received SCMI messages.
> >
> > The existing SCMI traces already collect a bunch of information about SCMI
> > message exchanges but they do NOT keep any payload information: this is
> > certainly preferable most of the time since dumping full SCMI messages to
> > the trace buffer involves a full copy of the payload.
> >
> > For this reason I added a new distinct trace_scmi_msg_dump with this series
> > in order to be able to selectively enable at will message dumping only when
> > required.
> >
> > Only successfully transmitted and received (valid) xfers are dumped.
>
> Looks good to me. I would like to hear from Jim if possible. I plan to
> merge this ASAP.
>
> --
> Regards,
> Sudeep

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