Commit c6a113b5 authored by Lina Iyer's avatar Lina Iyer Committed by Rafael J. Wysocki
Browse files

PM: domains: enable domain idle state accounting 



To enable better debug of PM domains, keep a track of successful
and failing attempts to enter each domain idle state.

This statistics are exported in debugfs when reading the
idle_states node associated with each PM domain.

Signed-off-by: default avatarLina Iyer <ilina@codeaurora.org>
[ rjw: Subject and changelog edits ]
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 505a70b7

drivers/base/power/domain.c

+7 −3
Original line number Diff line number Diff line
@@ -591,11 +591,14 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, 
		return -EBUSY;



	ret = _genpd_power_off(genpd, true);

	if (ret)

	if (ret) {

		genpd->states[genpd->state_idx].rejected++;

		return ret;

	}



	genpd->status = GENPD_STATE_OFF;

	genpd_update_accounting(genpd);

	genpd->states[genpd->state_idx].usage++;



	list_for_each_entry(link, &genpd->child_links, child_node) {

		genpd_sd_counter_dec(link->parent);
@@ -3061,7 +3064,7 @@ static int idle_states_show(struct seq_file *s, void *data) 
	if (ret)

		return -ERESTARTSYS;



	seq_puts(s, "State          Time Spent(ms)\n");

	seq_puts(s, "State          Time Spent(ms) Usage          Rejected\n");



	for (i = 0; i < genpd->state_count; i++) {

		ktime_t delta = 0;
@@ -3073,7 +3076,8 @@ static int idle_states_show(struct seq_file *s, void *data) 


		msecs = ktime_to_ms(

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

		seq_printf(s, "S%-13i %lld\n", i, msecs);

		seq_printf(s, "S%-13i %-14lld %-14llu %llu\n", i, msecs,

			      genpd->states[i].usage, genpd->states[i].rejected);

	}



	genpd_unlock(genpd);

include/linux/pm_domain.h

+2 −0
Original line number Diff line number Diff line
@@ -89,6 +89,8 @@ struct genpd_power_state { 
	s64 power_off_latency_ns;

	s64 power_on_latency_ns;

	s64 residency_ns;

	u64 usage;

	u64 rejected;

	struct fwnode_handle *fwnode;

	ktime_t idle_time;

	void *data;

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