linux-kernel - Re: [PATCH v2 4/5] thermal: core: genetlink support for events/cmd/sampling

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Message-ID: <d3d748b28e2ff540017129c1f3291fcaa68faa21.camel@linux.intel.com>
Date:   Wed, 01 Jul 2020 09:41:44 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>
Cc:     rkumbako@...eaurora.org, amit.kucheria@...aro.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/5] thermal: core: genetlink support for
 events/cmd/sampling

On Wed, 2020-07-01 at 18:31 +0200, Daniel Lezcano wrote:
> On 01/07/2020 17:49, Srinivas Pandruvada wrote:
> > [...]
> > 
> > > Then I'd prefer we only introduce the events that are used or
> > > will be
> > > used soon, like the tz disable/enable, to avoid some potential
> > > dead
> > > code.
> > > We can easily add more events when they are needed.
> > > 
> > > Srinivas, do you have plan to use the trip add/delete events?
> > Yes and also trip modify.
> 
> Ok I will keep those then.
> 
> > Also I need to have one more event for heartbeat like event which
> > needs
> > confirmation from user space to hardware the user process
> > controlling
> > thermal is active not dead. So whenever hardware wants to check
> > health 
> > it will send an event, which user space should acknowledge
> 
> Could it be the opposite? The userspace sends periodically a message
> to
> tell it is alive instead of having the kernel asking the userspace?
> 
Kernel doesn't ask (there is no timer in the kernel). The HW/FW send
special event for confirmation and expects reply (This is upto the
vendors). So user space can't send randomly.

> Is it ok if we add this in a separate series ?
Yes.

Thanks,
Srinivas

> 
> 
>