Commit c250d50f authored by Lukasz Luba's avatar Lukasz Luba Committed by Rafael J. Wysocki
Browse files

PM: EM: Add a flag indicating units of power values in Energy Model 



There are different platforms and devices which might use different scale
for the power values. Kernel sub-systems might need to check if all
Energy Model (EM) devices are using the same scale. Address that issue and
store the information inside EM for each device. Thanks to that they can
be easily compared and proper action triggered.

Suggested-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: default avatarQuentin Perret <qperret@google.com>
Signed-off-by: default avatarLukasz Luba <lukasz.luba@arm.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent f8394f23

drivers/cpufreq/scmi-cpufreq.c

+2 −1
Original line number Diff line number Diff line
@@ -188,7 +188,8 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy) 
	policy->fast_switch_possible =

		handle->perf_ops->fast_switch_possible(handle, cpu_dev);



	em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb, policy->cpus);

	em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb, policy->cpus,

				    false);



	return 0;

drivers/opp/of.c

+1 −1
Original line number Diff line number Diff line
@@ -1335,7 +1335,7 @@ int dev_pm_opp_of_register_em(struct device *dev, struct cpumask *cpus) 
		goto failed;

	}



	ret = em_dev_register_perf_domain(dev, nr_opp, &em_cb, cpus);

	ret = em_dev_register_perf_domain(dev, nr_opp, &em_cb, cpus, true);

	if (ret)

		goto failed;

include/linux/energy_model.h

+7 −2
Original line number Diff line number Diff line
@@ -29,6 +29,8 @@ struct em_perf_state { 
 * em_perf_domain - Performance domain

 * @table:		List of performance states, in ascending order

 * @nr_perf_states:	Number of performance states

 * @milliwatts:		Flag indicating the power values are in milli-Watts

 *			or some other scale.

 * @cpus:		Cpumask covering the CPUs of the domain. It's here

 *			for performance reasons to avoid potential cache

 *			misses during energy calculations in the scheduler
@@ -43,6 +45,7 @@ struct em_perf_state { 
struct em_perf_domain {

	struct em_perf_state *table;

	int nr_perf_states;

	int milliwatts;

	unsigned long cpus[];

};
@@ -79,7 +82,8 @@ struct em_data_callback { 
struct em_perf_domain *em_cpu_get(int cpu);

struct em_perf_domain *em_pd_get(struct device *dev);

int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,

				struct em_data_callback *cb, cpumask_t *span);

				struct em_data_callback *cb, cpumask_t *span,

				bool milliwatts);

void em_dev_unregister_perf_domain(struct device *dev);



/**
@@ -186,7 +190,8 @@ struct em_data_callback {}; 


static inline

int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,

				struct em_data_callback *cb, cpumask_t *span)

				struct em_data_callback *cb, cpumask_t *span,

				bool milliwatts)

{

	return -EINVAL;

}

kernel/power/energy_model.c

+23 −1
Original line number Diff line number Diff line
@@ -52,6 +52,17 @@ static int em_debug_cpus_show(struct seq_file *s, void *unused) 
}

DEFINE_SHOW_ATTRIBUTE(em_debug_cpus);



static int em_debug_units_show(struct seq_file *s, void *unused)

{

	struct em_perf_domain *pd = s->private;

	char *units = pd->milliwatts ? "milliWatts" : "bogoWatts";



	seq_printf(s, "%s\n", units);



	return 0;

}

DEFINE_SHOW_ATTRIBUTE(em_debug_units);



static void em_debug_create_pd(struct device *dev)

{

	struct dentry *d;
@@ -64,6 +75,8 @@ static void em_debug_create_pd(struct device *dev) 
		debugfs_create_file("cpus", 0444, d, dev->em_pd->cpus,

				    &em_debug_cpus_fops);



	debugfs_create_file("units", 0444, d, dev->em_pd, &em_debug_units_fops);



	/* Create a sub-directory for each performance state */

	for (i = 0; i < dev->em_pd->nr_perf_states; i++)

		em_debug_create_ps(&dev->em_pd->table[i], d);
@@ -250,17 +263,24 @@ EXPORT_SYMBOL_GPL(em_cpu_get); 
 * @cpus	: Pointer to cpumask_t, which in case of a CPU device is

 *		obligatory. It can be taken from i.e. 'policy->cpus'. For other

 *		type of devices this should be set to NULL.

 * @milliwatts	: Flag indicating that the power values are in milliWatts or

 *		in some other scale. It must be set properly.

 *

 * Create Energy Model tables for a performance domain using the callbacks

 * defined in cb.

 *

 * The @milliwatts is important to set with correct value. Some kernel

 * sub-systems might rely on this flag and check if all devices in the EM are

 * using the same scale.

 *

 * If multiple clients register the same performance domain, all but the first

 * registration will be ignored.

 *

 * Return 0 on success

 */

int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,

				struct em_data_callback *cb, cpumask_t *cpus)

				struct em_data_callback *cb, cpumask_t *cpus,

				bool milliwatts)

{

	unsigned long cap, prev_cap = 0;

	int cpu, ret;
@@ -313,6 +333,8 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states, 
	if (ret)

		goto unlock;



	dev->em_pd->milliwatts = milliwatts;



	em_debug_create_pd(dev);

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

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