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Commit afece3ab authored by Thara Gopinath's avatar Thara Gopinath Committed by Rafael J. Wysocki
Browse files

PM / Domains: Add time accounting to various genpd states 



This patch adds support to calculate the time spent by the generic
power domains in on and various idle states.

Signed-off-by: default avatarThara Gopinath <thara.gopinath@linaro.org>
Acked-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 520eccdf

drivers/base/power/domain.c

+32 −0
Original line number Diff line number Diff line
@@ -209,6 +209,34 @@ static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) 
	smp_mb__after_atomic();

}



#ifdef CONFIG_DEBUG_FS

static void genpd_update_accounting(struct generic_pm_domain *genpd)

{

	ktime_t delta, now;



	now = ktime_get();

	delta = ktime_sub(now, genpd->accounting_time);



	/*

	 * If genpd->status is active, it means we are just

	 * out of off and so update the idle time and vice

	 * versa.

	 */

	if (genpd->status == GPD_STATE_ACTIVE) {

		int state_idx = genpd->state_idx;



		genpd->states[state_idx].idle_time =

			ktime_add(genpd->states[state_idx].idle_time, delta);

	} else {

		genpd->on_time = ktime_add(genpd->on_time, delta);

	}



	genpd->accounting_time = now;

}

#else

static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {}

#endif



static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)

{

	unsigned int state_idx = genpd->state_idx;
@@ -361,6 +389,7 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, 
	}



	genpd->status = GPD_STATE_POWER_OFF;

	genpd_update_accounting(genpd);



	list_for_each_entry(link, &genpd->slave_links, slave_node) {

		genpd_sd_counter_dec(link->master);
@@ -413,6 +442,8 @@ static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) 
		goto err;



	genpd->status = GPD_STATE_ACTIVE;

	genpd_update_accounting(genpd);



	return 0;



 err:
@@ -1540,6 +1571,7 @@ int pm_genpd_init(struct generic_pm_domain *genpd, 
	genpd->max_off_time_changed = true;

	genpd->provider = NULL;

	genpd->has_provider = false;

	genpd->accounting_time = ktime_get();

	genpd->domain.ops.runtime_suspend = genpd_runtime_suspend;

	genpd->domain.ops.runtime_resume = genpd_runtime_resume;

	genpd->domain.ops.prepare = pm_genpd_prepare;

include/linux/pm_domain.h

+3 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ struct genpd_power_state { 
	s64 power_on_latency_ns;

	s64 residency_ns;

	struct fwnode_handle *fwnode;

	ktime_t idle_time;

};



struct genpd_lock_ops;
@@ -78,6 +79,8 @@ struct generic_pm_domain { 
	unsigned int state_count; /* number of states */

	unsigned int state_idx; /* state that genpd will go to when off */

	void *free; /* Free the state that was allocated for default */

	ktime_t on_time;

	ktime_t accounting_time;

	const struct genpd_lock_ops *lock_ops;

	union {

		struct mutex mlock;