blob: 4b3cc36be9a86266e6c1e9270dda342215dd24b8 [file] [log] [blame]
/*
**
** Copyright 2015, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <string>
#include <sstream>
#include <sys/types.h>
#include <sys/wait.h>
#include <cutils/properties.h>
#include "cpuconfig.h"
#include "perfprofdutils.h"
#define SYSFSCPU "/sys/devices/system/cpu"
HardwireCpuHelper::HardwireCpuHelper(bool perform)
: mpdecision_stopped_(false)
{
if (perform && GetMpdecisionRunning()) {
mpdecision_stopped_ = true;
StopMpdecision();
int ncores = GetNumCores();
for (int i = 0; i < ncores; ++i) {
OnlineCore(i, 1);
}
}
}
HardwireCpuHelper::~HardwireCpuHelper()
{
if (mpdecision_stopped_) {
RestartMpdecision();
}
}
bool HardwireCpuHelper::GetMpdecisionRunning()
{
char propBuf[PROPERTY_VALUE_MAX];
property_get("init.svc.mpdecision", propBuf, "");
return strcmp(propBuf, "running") == 0;
}
int HardwireCpuHelper::GetNumCores()
{
int ncores = -1;
std::string possible(SYSFSCPU "/possible");
FILE *fp = fopen(possible.c_str(), "re");
if (fp) {
unsigned lo = 0, hi = 0;
if (fscanf(fp, "%u-%u", &lo, &hi) == 2) {
ncores = hi - lo + 1;
}
fclose(fp);
}
return ncores;
}
void HardwireCpuHelper::OnlineCore(int i, int onoff)
{
std::stringstream ss;
ss << SYSFSCPU "/cpu" << i << "/online";
FILE *fp = fopen(ss.str().c_str(), "we");
if (fp) {
fprintf(fp, onoff ? "1\n" : "0\n");
fclose(fp);
} else {
W_ALOGW("open failed for %s", ss.str().c_str());
}
}
void HardwireCpuHelper::StopMpdecision()
{
if (property_set("ctl.stop", "mpdecision")) {
W_ALOGE("setprop ctl.stop mpdecision failed");
}
}
void HardwireCpuHelper::RestartMpdecision()
{
// Don't try to offline the cores we previously onlined -- let
// mpdecision figure out what to do
if (property_set("ctl.start", "mpdecision")) {
W_ALOGE("setprop ctl.start mpdecision failed");
}
}