PM / Sleep: Add wakeup_source_activate and wakeup_source_deactivate tracepoints

Add tracepoints to wakeup_source_activate and wakeup_source_deactivate.
Useful for checking that specific wakeup sources overlap as expected.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 7a6eada..1132799 100644 (file)
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -14,6 +14,7 @@
 #include <linux/suspend.h>
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
+#include <trace/events/power.h>
 
 #include "power.h"
 
@@ -374,12 +375,16 @@ EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
  */
 static void wakeup_source_activate(struct wakeup_source *ws)
 {
+       unsigned int cec;
+
        ws->active = true;
        ws->active_count++;
        ws->last_time = ktime_get();
 
        /* Increment the counter of events in progress. */
-       atomic_inc(&combined_event_count);
+       cec = atomic_inc_return(&combined_event_count);
+
+       trace_wakeup_source_activate(ws->name, cec);
 }
 
 /**
@@ -454,7 +459,7 @@ EXPORT_SYMBOL_GPL(pm_stay_awake);
  */
 static void wakeup_source_deactivate(struct wakeup_source *ws)
 {
-       unsigned int cnt, inpr;
+       unsigned int cnt, inpr, cec;
        ktime_t duration;
        ktime_t now;
 
@@ -489,7 +494,8 @@ static void wakeup_source_deactivate(struct wakeup_source *ws)
         * Increment the counter of registered wakeup events and decrement the
         * couter of wakeup events in progress simultaneously.
         */
-       atomic_add(MAX_IN_PROGRESS, &combined_event_count);
+       cec = atomic_add_return(MAX_IN_PROGRESS, &combined_event_count);
+       trace_wakeup_source_deactivate(ws->name, cec);
 
        split_counters(&cnt, &inpr);
        if (!inpr && waitqueue_active(&wakeup_count_wait_queue))

diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index cae9a94..0c97838 100644 (file)
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -65,6 +65,40 @@ TRACE_EVENT(machine_suspend,
        TP_printk("state=%lu", (unsigned long)__entry->state)
 );
 
+DECLARE_EVENT_CLASS(wakeup_source,
+
+       TP_PROTO(const char *name, unsigned int state),
+
+       TP_ARGS(name, state),
+
+       TP_STRUCT__entry(
+               __string(       name,           name            )
+               __field(        u64,            state           )
+       ),
+
+       TP_fast_assign(
+               __assign_str(name, name);
+               __entry->state = state;
+       ),
+
+       TP_printk("%s state=0x%lx", __get_str(name),
+               (unsigned long)__entry->state)
+);
+
+DEFINE_EVENT(wakeup_source, wakeup_source_activate,
+
+       TP_PROTO(const char *name, unsigned int state),
+
+       TP_ARGS(name, state)
+);
+
+DEFINE_EVENT(wakeup_source, wakeup_source_deactivate,
+
+       TP_PROTO(const char *name, unsigned int state),
+
+       TP_ARGS(name, state)
+);
+
 #ifdef CONFIG_EVENT_POWER_TRACING_DEPRECATED
 
 /*