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/***************************************************************************
* *
* Powersave Daemon *
* *
* Copyright (C) 2004,2005,2006 SUSE Linux Products GmbH *
* *
* Author(s): Holger Macht <hmacht@suse.de> *
* *
* This program is free software; you can redistribute it and/or modify it *
* under the terms of the GNU General Public License as published by the *
* Free Software Foundation; either version 2 of the License, or (at you *
* option) any later version. *
* *
* 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. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, write to the Free Software Foundation, Inc., *
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA *
* *
***************************************************************************/
#include <sstream>
#include "powerlib.h"
#include "cpufreq_interface.h"
#include "config_pm.h"
#include "cpu.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef CPUFREQ_MEASURE
unsigned long CPUFreq_Interface::polling_interval = 333;
time_t *CPUFreq_Interface::start_time = NULL;
#define MEASURE_LOG_FILE "/tmp/cpufreq.log"
#endif
CPUFreq_Interface::CPUFreq_Interface(list< int > cpu_list)
: CPU(*(cpu_list.begin()))
{
_cpu_cores = cpu_list;
// initialise variables
_cpu_max = 90;
_cpu_hysteresis = 5;
_high_cpu_limit = 0;
_consider_nice = 1;
_mode = _DYNAMIC;
ostringstream strstr;
strstr << SYSFS_FILES << "cpu" << _cpu_base << "/cpufreq/scaling_min_freq";
MIN_SPEED_FILE = strstr.str();
strstr.str("");
strstr << SYSFS_FILES << "cpu" << _cpu_base << "/cpufreq/scaling_max_freq";
MAX_SPEED_FILE = strstr.str();
strstr.str("");
strstr << SYSFS_FILES << "cpu" << _cpu_base << "/cpufreq/scaling_governor";
GOVERNOR_FILE = strstr.str();
strstr.str("");
strstr << SYSFS_FILES << "cpu" << _cpu_base << "/cpufreq/scaling_available_frequencies";
AVAILABLE_FREQS_FILE = strstr.str();
strstr.str("");
}
CPUFreq_Interface::~CPUFreq_Interface()
{
}
int CPUFreq_Interface::setMode(CPUFREQ_MODE mode)
{
_mode = mode;
if (online())
adjustSpeed();
return 0;
}
void CPUFreq_Interface::setConfigs(int max, int high_cpu, int hyster, int consider)
{
if (max < _cpu_hysteresis)
_cpu_max = _cpu_hysteresis;
else
_cpu_max = max;
int num_cpus = getCPUCount();
_cpu_max = max / num_cpus;
if (_cpu_max < 20)
_cpu_max = 20;
pDebug(DBG_INFO, "Adjusting CPU_HIGH_LIMIT depending on number of CPUs: "
"number of CPUs: %d, old CPU_HIGH_LIMIT: %d, new CPU_HIGH_LIMIT: %d",
num_cpus, max, _cpu_max);
if (high_cpu <= 0 || high_cpu > 100)
_high_cpu_limit = 0;
else
_high_cpu_limit = high_cpu;
if (hyster < 0)
_cpu_hysteresis = 5;
else
_cpu_hysteresis = hyster;
_consider_nice = consider;
if (online())
setConfig();
}
CPUFREQ_MODE CPUFreq_Interface::getMode()
{
return _mode;
}
int CPUFreq_Interface::setGovernor(const string &new_governor)
{
if (!online())
return 0;;
char governor[MAX_LINE_SIZE + 1];
if (!write_line(GOVERNOR_FILE.c_str(), "%s\n", new_governor.c_str()))
return -1;
// check if governor has been set
usleep(1000);
read_line(GOVERNOR_FILE.c_str(), governor, MAX_LINE_SIZE);
if (strstr(governor, new_governor.c_str()))
return 0;
else
return -1;
}
bool CPUFreq_Interface::read_line(const char *filename, char *line, unsigned len)
{
FILE *fp = fopen(filename, "r");
if (!fp) {
pDebug(DBG_ERR, "Could not open '%s': %s", filename, strerror(errno));
return false;
}
if ((!fgets(line, len, fp))) {
pDebug(DBG_ERR, "Could not read from '%s': %s", filename, strerror(errno));
fclose(fp);
return false;
}
fclose(fp);
return true;
}
bool CPUFreq_Interface::write_line(const char *filename, const char *fmt, ...)
{
FILE *fp = fopen(filename, "w+");
if (!fp) {
pDebug(DBG_WARN, "Could not open file for writing: %s; %s", filename, strerror(errno));
return false;
}
va_list ap;
va_start(ap, fmt); // get variable argument list passed
if (vfprintf(fp, fmt, ap) < 0) {
pDebug(DBG_WARN, "Could not write to file: %s", filename);
fclose(fp);
return false;
}
va_end(ap);
fclose(fp);
return true;
}
unsigned CPUFreq_Interface::read_value(const char *filename)
{
char line[MAX_LINE_SIZE];
if (!read_line(filename, line, sizeof line)) {
// we already throw an error in read_line()
return 0;
} else {
pDebug(DBG_INFO, "Value '%s' read from %s", line, filename);
return atoi(line);
}
}
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