PM / Runtime: Replace dev_dbg() with trace_rpm_*()

This patch replaces dev_dbg with trace_rpm_* inside
the three important functions:

	rpm_idle
	rpm_suspend
	rpm_resume

Trace points have the below advantages compared with dev_dbg:

	- trace points include much runtime information(such as
	running cpu, current task, ...)

	- most of linux distributions may disable "verbose debug"
	driver debug compile switch, so it is very difficult to
	report/debug runtime pm related problems from distribution
	users without this kind of debug information.

	- for upstream kernel users, enableing the debug switch will
	produce many useless "rpm_resume" output, and it is very noise.

	- dev_dbg inside rpm_suspend/rpm_resume may have some effects
	on runtime pm behaviour of console devicer

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index aecb2a887ed7..7a6fb5e34a0e 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -9,6 +9,7 @@
 
 #include <linux/sched.h>
 #include <linux/pm_runtime.h>
+#include <trace/events/rpm.h>
 #include "power.h"
 
 static int rpm_resume(struct device *dev, int rpmflags);
@@ -196,6 +197,7 @@ static int rpm_idle(struct device *dev, int rpmflags)
         int (*callback)(struct device *);
         int retval;
 
+        trace_rpm_idle(dev, rpmflags);
         retval = rpm_check_suspend_allowed(dev);
         if (retval < 0)
                 ;       /* Conditions are wrong. */
@@ -257,6 +259,7 @@ static int rpm_idle(struct device *dev, int rpmflags)
         wake_up_all(&dev->power.wait_queue);
 
  out:
+        trace_rpm_return_int(dev, _THIS_IP_, retval);
         return retval;
 }
 
@@ -301,7 +304,7 @@ static int rpm_suspend(struct device *dev, int rpmflags)
         struct device *parent = NULL;
         int retval;
 
-        dev_dbg(dev, "%s flags 0x%x\n", __func__, rpmflags);
+        trace_rpm_suspend(dev, rpmflags);
 
  repeat:
         retval = rpm_check_suspend_allowed(dev);
@@ -445,7 +448,7 @@ static int rpm_suspend(struct device *dev, int rpmflags)
         }
 
  out:
-        dev_dbg(dev, "%s returns %d\n", __func__, retval);
+        trace_rpm_return_int(dev, _THIS_IP_, retval);
 
         return retval;
 }
@@ -474,7 +477,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
         struct device *parent = NULL;
         int retval = 0;
 
-        dev_dbg(dev, "%s flags 0x%x\n", __func__, rpmflags);
+        trace_rpm_resume(dev, rpmflags);
 
  repeat:
         if (dev->power.runtime_error)
@@ -639,7 +642,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
                 spin_lock_irq(&dev->power.lock);
         }
 
-        dev_dbg(dev, "%s returns %d\n", __func__, retval);
+        trace_rpm_return_int(dev, _THIS_IP_, retval);
 
         return retval;
 }