Commit e458716a authored by Vincent Donnefort's avatar Vincent Donnefort Committed by Rafael J. Wysocki
Browse files

PM: EM: Mark inefficiencies in CPUFreq 



The Energy Model has a 1:1 mapping between OPPs and performance states
(em_perf_state). If a CPUFreq driver registers an Energy Model,
inefficiencies found by the latter can be applied to CPUFreq.

Signed-off-by: default avatarVincent Donnefort <vincent.donnefort@arm.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent b894d20e

kernel/power/energy_model.c

+40 −0
Original line number Original line Diff line number Diff line
@@ -10,6 +10,7 @@ 
#define pr_fmt(fmt) "energy_model: " fmt

#define pr_fmt(fmt) "energy_model: " fmt





#include <linux/cpu.h>

#include <linux/cpu.h>

#include <linux/cpufreq.h>

#include <linux/cpumask.h>

#include <linux/cpumask.h>

#include <linux/debugfs.h>

#include <linux/debugfs.h>

#include <linux/energy_model.h>

#include <linux/energy_model.h>
@@ -231,6 +232,43 @@ static int em_create_pd(struct device *dev, int nr_states, 
	return 0;

	return 0;

}

}





static void em_cpufreq_update_efficiencies(struct device *dev)

{

	struct em_perf_domain *pd = dev->em_pd;

	struct em_perf_state *table;

	struct cpufreq_policy *policy;

	int found = 0;

	int i;



	if (!_is_cpu_device(dev) || !pd)

		return;



	policy = cpufreq_cpu_get(cpumask_first(em_span_cpus(pd)));

	if (!policy) {

		dev_warn(dev, "EM: Access to CPUFreq policy failed");

		return;

	}



	table = pd->table;



	for (i = 0; i < pd->nr_perf_states; i++) {

		if (!(table[i].flags & EM_PERF_STATE_INEFFICIENT))

			continue;



		if (!cpufreq_table_set_inefficient(policy, table[i].frequency))

			found++;

	}



	if (!found)

		return;



	/*

	 * Efficiencies have been installed in CPUFreq, inefficient frequencies

	 * will be skipped. The EM can do the same.

	 */

	pd->flags |= EM_PERF_DOMAIN_SKIP_INEFFICIENCIES;

}



/**

/**

 * em_pd_get() - Return the performance domain for a device

 * em_pd_get() - Return the performance domain for a device

 * @dev : Device to find the performance domain for

 * @dev : Device to find the performance domain for
@@ -347,6 +385,8 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states, 
	if (milliwatts)

	if (milliwatts)

		dev->em_pd->flags |= EM_PERF_DOMAIN_MILLIWATTS;

		dev->em_pd->flags |= EM_PERF_DOMAIN_MILLIWATTS;





	em_cpufreq_update_efficiencies(dev);



	em_debug_create_pd(dev);

	em_debug_create_pd(dev);

	dev_info(dev, "EM: created perf domain\n");

	dev_info(dev, "EM: created perf domain\n");