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authorMing Lei <ming.lei@canonical.com>2011-09-27 22:54:41 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2011-09-27 22:54:41 +0200
commitc3dc2f14622a06488f11452b6efd1e02c5a8548b (patch)
treed1fc5bc15c8fc593457fffd9e90e66498c14e196 /drivers/base/power/runtime.c
parentPM / Runtime: Introduce trace points for tracing rpm_* functions (diff)
downloadlinux-c3dc2f14622a06488f11452b6efd1e02c5a8548b.tar.xz
linux-c3dc2f14622a06488f11452b6efd1e02c5a8548b.zip
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>
Diffstat (limited to 'drivers/base/power/runtime.c')
-rw-r--r--drivers/base/power/runtime.c11
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;
}