From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 tools/gator/daemon/CPUFreqDriver.cpp | 58 ++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 tools/gator/daemon/CPUFreqDriver.cpp

(limited to 'tools/gator/daemon/CPUFreqDriver.cpp')

diff --git a/tools/gator/daemon/CPUFreqDriver.cpp b/tools/gator/daemon/CPUFreqDriver.cpp
new file mode 100644
index 00000000..41f9d6f2
--- /dev/null
+++ b/tools/gator/daemon/CPUFreqDriver.cpp
@@ -0,0 +1,58 @@
+/**
+ * Copyright (C) ARM Limited 2013-2014. 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 as
+ * published by the Free Software Foundation.
+ */
+
+#include "CPUFreqDriver.h"
+
+#include "Buffer.h"
+#include "DriverSource.h"
+#include "Logging.h"
+#include "SessionData.h"
+
+CPUFreqDriver::CPUFreqDriver() : mPrev() {
+}
+
+CPUFreqDriver::~CPUFreqDriver() {
+}
+
+void CPUFreqDriver::readEvents(mxml_node_t *const) {
+	// Only for use with perf
+	if (!gSessionData->perf.isSetup()) {
+		return;
+	}
+
+	setCounters(new DriverCounter(getCounters(), strdup("Linux_power_cpu_freq")));
+}
+
+void CPUFreqDriver::read(Buffer *const buffer) {
+	char buf[64];
+	const DriverCounter *const counter = getCounters();
+	if ((counter == NULL) || !counter->isEnabled()) {
+		return;
+	}
+
+	const int key = getCounters()->getKey();
+	bool resetCores = false;
+	for (int i = 0; i < gSessionData->mCores; ++i) {
+		snprintf(buf, sizeof(buf), "/sys/devices/system/cpu/cpu%i/cpufreq/cpuinfo_cur_freq", i);
+		int64_t freq;
+		if (DriverSource::readInt64Driver(buf, &freq) != 0) {
+			freq = 0;
+		}
+		if (mPrev[i] != freq) {
+			mPrev[i] = freq;
+			// Change cores
+			buffer->event64(2, i);
+			resetCores = true;
+			buffer->event64(key, 1000*freq);
+		}
+	}
+	if (resetCores) {
+		// Revert cores, UserSpaceSource is all on core 0
+		buffer->event64(2, 0);
+	}
+}
-- 
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