linux-kernel - Re: [PATCH] powercap/drivers/dtpm: Add dtpm devfreq with energy model support

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Date:   Tue, 23 Mar 2021 17:00:42 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     cwchoi00@...il.com, myungjoo.ham@...sung.com,
        kyungmin.park@...sung.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, rafael@...nel.org
Subject: Re: [PATCH] powercap/drivers/dtpm: Add dtpm devfreq with energy model
 support

On 23/03/2021 16:56, Lukasz Luba wrote:
> Hi Daniel,
> 
> On 3/19/21 4:28 PM, Daniel Lezcano wrote:
>> Currently the dtpm supports the CPUs via cpufreq and the energy
>> model. This change provides the same for the device which supports
>> devfreq.
>>
>> Each device supporting devfreq and having an energy model can register
>> themselves in the list of supported devices.
>>
>> The concept is the same as the cpufreq dtpm support: the QoS is used
>> to aggregate the requests and the energy model gives the value of the
>> instantaneous power consumption ponderated by the load of the device.
>>
> 
> 
> I've just started the review, but I have a blocking question:
> 
> Why there is no unregister function (like 'dtmp_unregister_devfreq')?
> Do you consider any devfreq drivers to be modules?
> 
> The code looks like an API that it's going to be called directly in
> e.g. GPU driver in it's probe function. In that case probably the
> module unloading should call dtmp unregister.
> 
> Could you explain this to me please? So I can continue the review.

BTW, thanks for taking the time to review the patch.


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