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Commit a0912a31 authored by Quentin Perret's avatar Quentin Perret
Browse files

ANDROID: cpufreq: scmi: Register an Energy Model 



The Energy Model framework provides an API to register the active power
of CPUs. This commit calls this API from the scmi-cpufreq driver which uses
the power costs provided by the firmware.

Change-Id: I2e6036acbf004d41f921e1396983b07e022a5399
Signed-off-by: default avatarQuentin Perret <quentin.perret@arm.com>
parent b085f79a

drivers/cpufreq/scmi-cpufreq.c

+35 −1
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <linux/cpufreq.h>

#include <linux/cpumask.h>

#include <linux/cpu_cooling.h>

#include <linux/energy_model.h>

#include <linux/export.h>

#include <linux/module.h>

#include <linux/pm_opp.h>
@@ -103,13 +104,42 @@ scmi_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) 
	return 0;

}



static int __maybe_unused

scmi_get_cpu_power(unsigned long *power, unsigned long *KHz, int cpu)

{

	struct device *cpu_dev = get_cpu_device(cpu);

	unsigned long Hz;

	int ret, domain;



	if (!cpu_dev) {

		pr_err("failed to get cpu%d device\n", cpu);

		return -ENODEV;

	}



	domain = handle->perf_ops->device_domain_id(cpu_dev);

	if (domain < 0)

		return domain;



	/* Get the power cost of the performance domain. */

	Hz = *KHz * 1000;

	ret = handle->perf_ops->est_power_get(handle, domain, &Hz, power);

	if (ret)

		return ret;



	/* The EM framework specifies the frequency in KHz. */

	*KHz = Hz / 1000;



	return 0;

}



static int scmi_cpufreq_init(struct cpufreq_policy *policy)

{

	int ret;

	int ret, nr_opp;

	unsigned int latency;

	struct device *cpu_dev;

	struct scmi_data *priv;

	struct cpufreq_frequency_table *freq_table;

	struct em_data_callback em_cb = EM_DATA_CB(scmi_get_cpu_power);



	cpu_dev = get_cpu_device(policy->cpu);

	if (!cpu_dev) {
@@ -142,6 +172,7 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy) 
		ret = -EPROBE_DEFER;

		goto out_free_opp;

	}

	nr_opp = ret;



	priv = kzalloc(sizeof(*priv), GFP_KERNEL);

	if (!priv) {
@@ -171,6 +202,9 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy) 
	policy->cpuinfo.transition_latency = latency;



	policy->fast_switch_possible = true;



	em_register_perf_domain(policy->cpus, nr_opp, &em_cb);



	return 0;



out_free_priv: