PM / QoS: Add pm_qos_update_target/flags tracepoints

This patch adds tracepoints to pm_qos_update_target and
pm_qos_update_flags. It's useful for checking pm qos action,
previous value and current value.

Signed-off-by: Sahara <keun-o.park@windriver.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index f2f5f6e22a3c..4fb8d1427938 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -44,6 +44,7 @@
 
 #include <linux/uaccess.h>
 #include <linux/export.h>
+#include <trace/events/power.h>
 
 /*
  * locking rule: all changes to constraints or notifiers lists
@@ -202,6 +203,7 @@ int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
 
         spin_unlock_irqrestore(&pm_qos_lock, flags);
 
+        trace_pm_qos_update_target(action, prev_value, curr_value);
         if (prev_value != curr_value) {
                 blocking_notifier_call_chain(c->notifiers,
                                              (unsigned long)curr_value,
@@ -272,6 +274,7 @@ bool pm_qos_update_flags(struct pm_qos_flags *pqf,
 
         spin_unlock_irqrestore(&pm_qos_lock, irqflags);
 
+        trace_pm_qos_update_flags(action, prev_value, curr_value);
         return prev_value != curr_value;
 }