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: 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>

2 files changed, 35 insertions, 0 deletions

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 60303aa28587..431488914982 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -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;
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 41004d97cefa..84f423d5633e 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -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;