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PM: domains: enable domain idle state accounting

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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: Lina Iyer <ilina@codeaurora.org>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lina Iyer 2020-10-15 14:47:22 -06:00 committed by Rafael J. Wysocki
parent 505a70b783
commit c6a113b523
2 changed files with 9 additions and 3 deletions
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10
drivers/base/power/domain.c
View File

@ -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);

2
include/linux/pm_domain.h
View File

@ -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;