PM / sleep: trace events for suspend/resume

Adds trace events that give finer resolution into suspend/resume. These
events are graphed in the timelines generated by the analyze_suspend.py
script. They represent large areas of time consumed that are typical to
suspend and resume.

The event is triggered by calling the function "trace_suspend_resume"
with three arguments: a string (the name of the event to be displayed
in the timeline), an integer (case specific number, such as the power
state or cpu number), and a boolean (where true is used to denote the start
of the timeline event, and false to denote the end).

The suspend_resume trace event reproduces the data that the machine_suspend
trace event did, so the latter has been removed.

Signed-off-by: Todd Brandt <todd.e.brandt@intel.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/base/syscore.c b/drivers/base/syscore.c
index e8d11b6630ee..dbb8350ea8dc 100644
--- a/drivers/base/syscore.c
+++ b/drivers/base/syscore.c
@@ -10,6 +10,7 @@
 #include <linux/mutex.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
+#include <trace/events/power.h>
 
 static LIST_HEAD(syscore_ops_list);
 static DEFINE_MUTEX(syscore_ops_lock);
@@ -49,6 +50,7 @@ int syscore_suspend(void)
         struct syscore_ops *ops;
         int ret = 0;
 
+        trace_suspend_resume(TPS("syscore_suspend"), 0, true);
         pr_debug("Checking wakeup interrupts\n");
 
         /* Return error code if there are any wakeup interrupts pending. */
@@ -70,6 +72,7 @@ int syscore_suspend(void)
                                 "Interrupts enabled after %pF\n", ops->suspend);
                 }
 
+        trace_suspend_resume(TPS("syscore_suspend"), 0, false);
         return 0;
 
  err_out:
@@ -92,6 +95,7 @@ void syscore_resume(void)
 {
         struct syscore_ops *ops;
 
+        trace_suspend_resume(TPS("syscore_resume"), 0, true);
         WARN_ONCE(!irqs_disabled(),
                 "Interrupts enabled before system core resume.\n");
 
@@ -103,6 +107,7 @@ void syscore_resume(void)
                         WARN_ONCE(!irqs_disabled(),
                                 "Interrupts enabled after %pF\n", ops->resume);
                 }
+        trace_suspend_resume(TPS("syscore_resume"), 0, false);
 }
 EXPORT_SYMBOL_GPL(syscore_resume);
 #endif /* CONFIG_PM_SLEEP */