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

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Message-ID: <20190515110156.ru2wxqvwffqgq3t3@queper01-lin>
Date:   Wed, 15 May 2019 12:01:58 +0100
From:   Quentin Perret <quentin.perret@....com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
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 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.

Thanks,
Quentin

--->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))