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PM / Domains: Add time accounting to various genpd states

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

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Thara Gopinath 2017-07-14 13:10:15 -04:00 committed by Rafael J. Wysocki
parent 520eccdfe1
commit afece3ab9a
2 changed files with 35 additions and 0 deletions
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32
drivers/base/power/domain.c
View File

@ -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;

3
include/linux/pm_domain.h
View File

@ -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;