PM / wakeup: add a dummy wakeup_source to record statistics

After a wakeup_source is destroyed, we lost all information such as how
long this wakeup_source has been active. Add a dummy wakeup_source to
record such info.

Signed-off-by: Jin Qian <jinqian@android.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 7b5ad9a5a6b6..87c2603b9327 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -56,6 +56,11 @@ static LIST_HEAD(wakeup_sources);
 
 static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue);
 
+static struct wakeup_source deleted_ws = {
+        .name = "deleted",
+        .lock =  __SPIN_LOCK_UNLOCKED(deleted_ws.lock),
+};
+
 /**
  * wakeup_source_prepare - Prepare a new wakeup source for initialization.
  * @ws: Wakeup source to prepare.
@@ -107,6 +112,34 @@ void wakeup_source_drop(struct wakeup_source *ws)
 }
 EXPORT_SYMBOL_GPL(wakeup_source_drop);
 
+/*
+ * Record wakeup_source statistics being deleted into a dummy wakeup_source.
+ */
+static void wakeup_source_record(struct wakeup_source *ws)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&deleted_ws.lock, flags);
+
+        if (ws->event_count) {
+                deleted_ws.total_time =
+                        ktime_add(deleted_ws.total_time, ws->total_time);
+                deleted_ws.prevent_sleep_time =
+                        ktime_add(deleted_ws.prevent_sleep_time,
+                                  ws->prevent_sleep_time);
+                deleted_ws.max_time =
+                        ktime_compare(deleted_ws.max_time, ws->max_time) > 0 ?
+                                deleted_ws.max_time : ws->max_time;
+                deleted_ws.event_count += ws->event_count;
+                deleted_ws.active_count += ws->active_count;
+                deleted_ws.relax_count += ws->relax_count;
+                deleted_ws.expire_count += ws->expire_count;
+                deleted_ws.wakeup_count += ws->wakeup_count;
+        }
+
+        spin_unlock_irqrestore(&deleted_ws.lock, flags);
+}
+
 /**
  * wakeup_source_destroy - Destroy a struct wakeup_source object.
  * @ws: Wakeup source to destroy.
@@ -119,6 +152,7 @@ void wakeup_source_destroy(struct wakeup_source *ws)
                 return;
 
         wakeup_source_drop(ws);
+        wakeup_source_record(ws);
         kfree(ws->name);
         kfree(ws);
 }
@@ -912,6 +946,8 @@ static int wakeup_sources_stats_show(struct seq_file *m, void *unused)
                 print_wakeup_source_stats(m, ws);
         rcu_read_unlock();
 
+        print_wakeup_source_stats(m, &deleted_ws);
+
         return 0;
 }