From 8addd3815e24aed79f2067098368873bba791e95 Mon Sep 17 00:00:00 2001
From: Lukasz Luba <l.luba@partner.samsung.com>
Date: Mon, 18 Feb 2019 19:21:08 +0100
Subject: [PATCH] BACKPORT: trace: events: add devfreq trace event file

The patch adds a new file for with trace events for devfreq
framework. They are used for performance analysis of the framework.
It also contains updates in MAINTAINERS file adding new entry for
devfreq maintainers.

Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
Change-Id: Id252a3809cd0d210e3af027141b3ff7572fbfcc7
---
 MAINTAINERS                    |  1 +
 include/trace/events/devfreq.h | 40 ++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 include/trace/events/devfreq.h

diff --git a/MAINTAINERS b/MAINTAINERS
index eb88243da33a..e90ca57c7273 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4303,6 +4303,7 @@ S:	Maintained
 F:	drivers/devfreq/
 F:	include/linux/devfreq.h
 F:	Documentation/devicetree/bindings/devfreq/
+F:	include/trace/events/devfreq.h
 
 DEVICE FREQUENCY EVENT (DEVFREQ-EVENT)
 M:	Chanwoo Choi <cw00.choi@samsung.com>
diff --git a/include/trace/events/devfreq.h b/include/trace/events/devfreq.h
new file mode 100644
index 000000000000..cf5b8772175d
--- /dev/null
+++ b/include/trace/events/devfreq.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM devfreq
+
+#if !defined(_TRACE_DEVFREQ_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_DEVFREQ_H
+
+#include <linux/devfreq.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(devfreq_monitor,
+	TP_PROTO(struct devfreq *devfreq),
+
+	TP_ARGS(devfreq),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, freq)
+		__field(unsigned long, busy_time)
+		__field(unsigned long, total_time)
+		__field(unsigned int, polling_ms)
+		__string(dev_name, dev_name(&devfreq->dev))
+	),
+
+	TP_fast_assign(
+		__entry->freq = devfreq->previous_freq;
+		__entry->busy_time = devfreq->last_status.busy_time;
+		__entry->total_time = devfreq->last_status.total_time;
+		__entry->polling_ms = devfreq->profile->polling_ms;
+		__assign_str(dev_name, dev_name(&devfreq->dev));
+	),
+
+	TP_printk("dev_name=%s freq=%lu polling_ms=%u load=%lu",
+		__get_str(dev_name), __entry->freq, __entry->polling_ms,
+		__entry->total_time == 0 ? 0 :
+			(100 * __entry->busy_time) / __entry->total_time)
+);
+#endif /* _TRACE_DEVFREQ_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>