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/**
* 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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