linux-kernel - [PATCH 1/8] cpufreq: Auto-register with energy model if asked

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Date:   Tue, 10 Aug 2021 13:06:48 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Rafael Wysocki <rjw@...ysocki.net>,
        Vincent Donnefort <vincent.donnefort@....com>,
        lukasz.luba@....com, Viresh Kumar <viresh.kumar@...aro.org>
Cc:     linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/8] cpufreq: Auto-register with energy model if asked

Many cpufreq drivers register with the energy model for each policy and
do exactly the same thing. Follow the footsteps of thermal-cooling, to
get it done from the cpufreq core itself.

Provide a cpufreq driver flag so drivers can ask the cpufreq core to
register with the EM core on their behalf. This allows us to get rid of
duplicated code in the drivers.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/cpufreq/cpufreq.c | 9 +++++++++
 include/linux/cpufreq.h   | 6 ++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 06c526d66dd3..a060dc2aa2f2 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -23,6 +23,7 @@
 #include <linux/kernel_stat.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/pm_opp.h>
 #include <linux/pm_qos.h>
 #include <linux/slab.h>
 #include <linux/suspend.h>
@@ -1511,6 +1512,11 @@ static int cpufreq_online(unsigned int cpu)
 	if (cpufreq_thermal_control_enabled(cpufreq_driver))
 		policy->cdev = of_cpufreq_cooling_register(policy);
 
+	if (cpufreq_driver->flags & CPUFREQ_REGISTER_WITH_EM) {
+		dev_pm_opp_of_register_em(get_cpu_device(policy->cpu),
+					  policy->related_cpus);
+	}
+
 	pr_debug("initialization complete\n");
 
 	return 0;
@@ -1602,6 +1608,9 @@ static int cpufreq_offline(unsigned int cpu)
 		goto unlock;
 	}
 
+	if (cpufreq_driver->flags & CPUFREQ_REGISTER_WITH_EM)
+		dev_pm_opp_of_unregister_em(get_cpu_device(cpu));
+
 	if (cpufreq_thermal_control_enabled(cpufreq_driver)) {
 		cpufreq_cooling_unregister(policy->cdev);
 		policy->cdev = NULL;
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 9fd719475fcd..f11723cd4cca 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -424,6 +424,12 @@ struct cpufreq_driver {
  */
 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING	BIT(6)
 
+/*
+ * Set by drivers that want the core to automatically register the CPU device
+ * with Energy Model.
+ */
+#define CPUFREQ_REGISTER_WITH_EM		BIT(7)
+
 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 
-- 
2.31.1.272.g89b43f80a514