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From:   Daniel Lezcano <daniel.lezcano@linaro.org>
Subject: Re: [PATCH v5 1/5] PM / EM: add devices to Energy Model
To:     Lukasz Luba <lukasz.luba@arm.com>, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        dri-devel@lists.freedesktop.org, linux-omap@vger.kernel.org,
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Message-ID: <09b680a5-a118-8c6e-0ae1-03ab5f10c573@linaro.org>
Date:   Fri, 3 Apr 2020 18:05:03 +0200
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Sender: linux-kernel-owner@vger.kernel.org
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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@google.com>
> Signed-off-by: Lukasz Luba <lukasz.luba@arm.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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