linux-kernel - Re: [PATCH v4 2/3] PM / EM: Expose perf domain struct

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Date:   Wed, 15 May 2019 13:07:36 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Quentin Perret <quentin.perret@....com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>, edubezval@...il.com,
        rui.zhang@...el.com, javi.merino@...nel.org,
        amit.kachhap@...il.com, rjw@...ysocki.net, will.deacon@....com,
        catalin.marinas@....com, dietmar.eggemann@....com,
        ionela.voinescu@....com, mka@...omium.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 2/3] PM / EM: Expose perf domain struct

On 15/05/2019 13:01, Quentin Perret wrote:
> On Wednesday 15 May 2019 at 12:51:57 (+0200), Daniel Lezcano wrote:
>> On 15/05/2019 12:46, Quentin Perret wrote:
>>> On Wednesday 15 May 2019 at 11:40:44 (+0100), Quentin Perret wrote:
>>
>> [ ... ]
>>
>>>> +#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
>>>>         if (capacitance) {
>>>>                 ret = update_freq_table(cpufreq_cdev, capacitance);
>>>>                 if (ret) {
>>>>                         cdev = ERR_PTR(ret);
>>>>                         goto remove_ida;
>>>>                 }
>>>> -
>>>> -               cooling_ops = &cpufreq_power_cooling_ops;
>>>> -       } else {
>>>> -               cooling_ops = &cpufreq_cooling_ops;
>>>>         }
>>>> +#endif
>>>> +       cooling_ops = &cpufreq_cooling_ops;
>>>
>>> Argh, that is actually broken with !capacitance and
>>> THERMAL_GOV_POWER_ALLOCATOR=y ... Perhaps it's best to keep the two
>>> thermal_cooling_device_ops struct separated in the end.
>>
>> Or alternatively you can keep one structure but instead of filling the
>> state2power,power2state and getrequestedpower fields in the declaration,
>> you fill them in the if (capacitance) block, no?
> 
> Something like the below ? Yes, that works too. I'll write a proper
> patch and send that next week or so.

Yes, exactly. And IMHO, that helps for the understanding of code also.

> --->8---
> 
>  /* Bind cpufreq callbacks to thermal cooling device ops */
> 
>  static struct thermal_cooling_device_ops cpufreq_cooling_ops = {
> -       .get_max_state = cpufreq_get_max_state,
> -       .get_cur_state = cpufreq_get_cur_state,
> -       .set_cur_state = cpufreq_set_cur_state,
> -};
> -
> -static struct thermal_cooling_device_ops cpufreq_power_cooling_ops = {
>         .get_max_state          = cpufreq_get_max_state,
>         .get_cur_state          = cpufreq_get_cur_state,
>         .set_cur_state          = cpufreq_set_cur_state,
> -       .get_requested_power    = cpufreq_get_requested_power,
> -       .state2power            = cpufreq_state2power,
> -       .power2state            = cpufreq_power2state,
>  };
> 
>  /* Notifier for cpufreq policy change */
> @@ -674,18 +667,19 @@ __cpufreq_cooling_register(struct device_node *np,
>                         pr_debug("%s: freq:%u KHz\n", __func__, freq);
>         }
> 
> +       cooling_ops = &cpufreq_cooling_ops;
> +#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
>         if (capacitance) {
>                 ret = update_freq_table(cpufreq_cdev, capacitance);
>                 if (ret) {
>                         cdev = ERR_PTR(ret);
>                         goto remove_ida;
>                 }
> -
> -               cooling_ops = &cpufreq_power_cooling_ops;
> -       } else {
> -               cooling_ops = &cpufreq_cooling_ops;
> +               cooling_ops->get_requested_power = cpufreq_get_requested_power;
> +               cooling_ops->state2power = cpufreq_state2power;
> +               cooling_ops->power2state = cpufreq_power2state;
>         }
> -
> +#endif
>         cdev = thermal_of_cooling_device_register(np, dev_name, cpufreq_cdev,
>                                                   cooling_ops);
>         if (IS_ERR(cdev))
> 


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