linux-kernel - Re: [PATCH v5 1/5] PM / EM: add devices to Energy Model

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Date:   Fri, 3 Apr 2020 18:05:03 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, linux-omap@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-imx@....com
Cc:     Morten.Rasmussen@....com, Dietmar.Eggemann@....com,
        javi.merino@....com, cw00.choi@...sung.com,
        b.zolnierkie@...sung.com, rjw@...ysocki.net, sudeep.holla@....com,
        viresh.kumar@...aro.org, nm@...com, sboyd@...nel.org,
        rui.zhang@...el.com, amit.kucheria@...durent.com, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, rostedt@...dmis.org,
        qperret@...gle.com, bsegall@...gle.com, mgorman@...e.de,
        shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
        kernel@...gutronix.de, khilman@...nel.org, agross@...nel.org,
        bjorn.andersson@...aro.org, robh@...nel.org,
        matthias.bgg@...il.com, steven.price@....com,
        tomeu.vizoso@...labora.com, alyssa.rosenzweig@...labora.com,
        airlied@...ux.ie, daniel@...ll.ch, liviu.dudau@....com,
        lorenzo.pieralisi@....com, patrick.bellasi@...bug.net,
        orjan.eide@....com, rdunlap@...radead.org, mka@...omium.org
Subject: Re: [PATCH v5 1/5] PM / EM: add devices to Energy Model


Hi Lukasz,


On 18/03/2020 12:45, Lukasz Luba wrote:
> Add support of other devices into the Energy Model framework not only the
> CPUs. Change the interface to be more unified which can handle other
> devices as well.

thanks for taking care of that. Overall I like the changes in this patch
but it hard to review in details because the patch is too big :/

Could you split this patch into smaller ones?

eg. (at your convenience)

 - One patch renaming s/cap/perf/

 - One patch adding a new function:

    em_dev_register_perf_domain(struct device *dev,
				unsigned int nr_states,
				struct em_data_callback *cb);

   (+ EXPORT_SYMBOL_GPL)

    And em_register_perf_domain() using it.

 - One converting the em_register_perf_domain() user to
	em_dev_register_perf_domain

 - One adding the different new 'em' functions

 - And finally one removing em_register_perf_domain().


> Acked-by: Quentin Perret <qperret@...gle.com>
> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> ---

[ ... ]

>  2. Core APIs
> @@ -70,14 +72,16 @@ CONFIG_ENERGY_MODEL must be enabled to use the EM framework.
>  Drivers are expected to register performance domains into the EM framework by
>  calling the following API::
>  
> -  int em_register_perf_domain(cpumask_t *span, unsigned int nr_states,
> -			      struct em_data_callback *cb);
> +  int em_register_perf_domain(struct device *dev, unsigned int nr_states,
> +		struct em_data_callback *cb, cpumask_t *cpus);

Isn't possible to get rid of this cpumask by using
cpufreq_cpu_get() which returns the cpufreq's policy and from their get
the related cpus ?

[ ... ]


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