msm: kgsl: Add gpu_frequency tracepoint to power trace system

Add a tracepoint to the power trace system to report GPU
frequency change. Format for this is identical to cpu_frequency
event and compatible with Android tools such as Perfetto.

Change-Id: I6207f45f506ab595bd261a297abdd8f40990c8de
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>

drivers/gpu/msm/kgsl_pwrctrl.c

@@ -28,6 +28,7 @@
 #include "kgsl_device.h"
 #include "kgsl_trace.h"
 #include "kgsl_gmu_core.h"
+#include "kgsl_trace_power.h"
 
 #define KGSL_PWRFLAGS_POWER_ON 0
 #define KGSL_PWRFLAGS_CLK_ON   1
@@ -492,6 +493,8 @@ void kgsl_pwrctrl_pwrlevel_change(struct kgsl_device *device,
 			pwr->previous_pwrlevel,
 			pwr->pwrlevels[old_level].gpu_freq);
 
+	trace_gpu_frequency(pwrlevel->gpu_freq/1000, 0);
+
 	/*
 	 * Some targets do not support the bandwidth requirement of
 	 * GPU at TURBO, for such targets we need to set GPU-BIMC

drivers/gpu/msm/kgsl_trace.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2011, 2013, 2015 The Linux Foundation. All rights reserved.
+/* Copyright (c) 2011, 2013, 2015, 2019 The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -19,8 +19,11 @@
 /* Instantiate tracepoints */
 #define CREATE_TRACE_POINTS
 #include "kgsl_trace.h"
+#include "kgsl_trace_power.h"
 
 EXPORT_TRACEPOINT_SYMBOL(kgsl_regwrite);
 EXPORT_TRACEPOINT_SYMBOL(kgsl_issueibcmds);
 EXPORT_TRACEPOINT_SYMBOL(kgsl_user_pwrlevel_constraint);
 EXPORT_TRACEPOINT_SYMBOL(kgsl_constraint);
+
+EXPORT_TRACEPOINT_SYMBOL(gpu_frequency);

drivers/gpu/msm/kgsl_trace_power.h

@@ -0,0 +1,49 @@
+/* Copyright (c) 2019, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#if !defined(_KGSL_TRACE_POWER_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _KGSL_TRACE_POWER_H
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM power
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE kgsl_trace_power
+
+#include <linux/tracepoint.h>
+
+/**
+ * gpu_frequency - Reports frequency changes in GPU clock domains
+ * @state:  New frequency (in KHz)
+ * @gpu_id: GPU clock domain
+ */
+TRACE_EVENT(gpu_frequency,
+	TP_PROTO(unsigned int state, unsigned int gpu_id),
+	TP_ARGS(state, gpu_id),
+	TP_STRUCT__entry(
+		__field(unsigned int, state)
+		__field(unsigned int, gpu_id)
+	),
+	TP_fast_assign(
+		__entry->state = state;
+		__entry->gpu_id = gpu_id;
+	),
+
+	TP_printk("state=%lu gpu_id=%lu",
+		(unsigned long)__entry->state,
+		(unsigned long)__entry->gpu_id)
+);
+
+#endif /* _KGSL_TRACE_POWER_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>