lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Fri, 16 Oct 2020 17:02:18 +0100
From:   Quentin Perret <>
To:     Lukasz Luba <>
Cc:     Daniel Lezcano <>,
        "Rafael J. Wysocki" <>,
        "Rafael J. Wysocki" <>,
        Linux Kernel Mailing List <>,
        Linux PM <>,
        "open list:DOCUMENTATION" <>,
        "" <>,
        Rob Herring <>,
        Amit Kucheria <>,
        Jonathan Corbet <>,
        Dietmar Eggemann <>,
        Doug Anderson <>,
        Matthias Kaehlcke <>,
        "Nayak, Rajendra" <>
Subject: Re: [PATCH v2 0/3] Clarify abstract scale usage for power values in
 Energy Model, EAS and IPA

On Friday 16 Oct 2020 at 15:42:57 (+0100), Lukasz Luba wrote:
> Do you mean a new entry in DT which will be always below
> 'dynamic-power-coefficient' and/or 'sustainable-power' saying the unit
> of above value?

Yes, something like that.

> There was discussion with Rob (and Doug) about this. I got the
> impression he was against any new DT stuff [1].
> We don't have to, I think we all agree that DT will only support mW.

Right, I agree this is a 'nice-to-have'.

> I have agreed to this idea having a 'flag' inside EM [2], which
> indicates the mW or bogoWatts. It could be set via API:
> em_dev_register_perf_domain() and this new last argument.
> I can write that patch. There is only two usage (3rd is on LKML) of
> that function. The DT way, which is via:
> dev_pm_opp_of_register_em() will always set 'true';
> Driver direct calls of em_dev_register_perf_domain(), will have to
> set appropriate value ('true' or 'false'). The EM struct em_perf_domain
> will have the new bool field set based on that.
> Is it make sense?

I had something more complicated in mind, where units are arbitrary
('milliwats', 'scmi-bogowatts', ...) as that would help if units can be
specified in the DT too, but if we don't care about that then yes I
suppose a boolean flag should do.


Powered by blists - more mailing lists