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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include "sysfs.h"
#include "cpufreq.h"
#include "debug.h"
#include "cputemp2maxfreq.h"
#include "failsafe.h"
#include "version.h"
#include "argparse.h"
#include "logger.h"
// Set default config
struct s_config config={
"conservative", // Governor
70000, // Temperature
"/sys/devices/virtual/thermal/thermal_zone0/temp", // Temperature input
100000, // Frequency step
2000000, // Fallback frequency
10, // Interval
"stdout", // Logger name
&logger_stdout, // Logger function
0, // Don't log measurement data
};
struct s_cpudata cpudata;
void signal_handler(int signum)
{
config.logger("Received signal %d, exiting.",signum);
failsafe(0);
}
int main(int argc,char **argv)
{
long int diff;
long int newfreq;
argparse(argc,argv);
config.logger("Version %s, buildtime %s %s",version(),__DATE__,__TIME__);
// Log configuration
config.logger("Configuration:");
config.logger("Governor: %s",config.governor);
config.logger("Temperature: %ld",config.max_temp);
config.logger("Temp input: %s",config.temp_input);
config.logger("Frequency step: %ld",config.freq_step);
config.logger("Fallback frquency: %ld",config.fallback_freq);
config.logger("Interval: %d",config.interval);
config.logger("Logger: %s (%p)",config.logger_name,config.logger);
config.logger("Log measurement data: %d",config.log_data);
if ((config.max_temp<VALID_TEMP_MIN) || (config.max_temp>VALID_TEMP_MAX))
{
config.logger("Invalid temperature, range is %d-%d",VALID_TEMP_MIN,VALID_TEMP_MAX);
exit(1);
}
if ((config.freq_step<VALID_STEP_MIN) || (config.freq_step>VALID_STEP_MAX))
{
config.logger("Invalid frequency step, range is %d-%d",VALID_STEP_MIN,VALID_STEP_MAX);
exit(1);
}
if ((config.interval<VALID_INTERVAL_MIN) || (config.interval>VALID_INTERVAL_MAX))
{
config.logger("Invalid poll interval, range is %d-%d",VALID_INTERVAL_MIN,VALID_INTERVAL_MAX);
exit(1);
}
// Get and validate CPU data
cpudata.min_freq=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/cpuinfo_min_freq");
cpudata.max_freq=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/cpuinfo_max_freq");
cpudata.scale_max=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq");
config.logger("CPU data:");
config.logger("Minimum frequency: %ld",cpudata.min_freq);
config.logger("Maximum frequency: %ld",cpudata.max_freq);
config.logger("Scaling maximum frequency: %ld",cpudata.scale_max);
if ((cpudata.min_freq<VALID_FREQ_MIN) || (cpudata.min_freq>VALID_FREQ_MAX) ||
(cpudata.max_freq<VALID_FREQ_MIN) || (cpudata.max_freq>VALID_FREQ_MAX) ||
(cpudata.scale_max<VALID_FREQ_MIN) || (cpudata.scale_max>VALID_FREQ_MAX))
{
// If we have to fail now, there's not much we can do because we have no data
config.logger("Invalid CPU data, exiting");
exit(1);
}
// Modify fallback frequency if needed
if (config.fallback_freq<cpudata.min_freq)
{
config.logger("Fallback frequency is lower than CPU's minimum frequency, setting to %ld",cpudata.min_freq);
config.fallback_freq=cpudata.min_freq;
}
if (config.fallback_freq>cpudata.max_freq)
{
config.logger("Fallback frequency is higher than CPU's maximum frequency, setting to %ld",cpudata.max_freq);
config.fallback_freq=cpudata.max_freq;
}
// Set the governor
if (strcmp(config.governor,"keep")!=0)
{
if (cpufreq_set_str("scaling_governor",config.governor,0)<0)
{
config.logger("Failed to set governor, error %d (%s)",errno,strerror(errno));
// We failed to set the governor, call the failsafe
failsafe(1);
}
}
// Set signal handlers
signal(SIGTERM,signal_handler);
signal(SIGINT,signal_handler);
signal(SIGQUIT,signal_handler);
while(1)
{
// Get new measurements
cpudata.cur_freq=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq");
if ((cpudata.cur_freq<VALID_FREQ_MIN) || (cpudata.cur_freq>VALID_FREQ_MAX))
{
config.logger("Invalid current frequency reported by CPU, exiting");
failsafe(1);
}
cpudata.cur_temp=sysfs_read_long_int(config.temp_input);
if ((cpudata.cur_temp<VALID_TEMP_MIN) || (cpudata.cur_temp>VALID_TEMP_MAX))
{
config.logger("Invalid current tempature reported by CPU, exiting");
failsafe(1);
}
DEBUG1_MAIN("Data: %ld %ld %ld %ld %ld\n",cpudata.cur_temp,config.max_temp,cpudata.max_freq,cpudata.scale_max,cpudata.cur_freq);
if (config.log_data>0)
{
config.logger("CPU Temperature: %ld, CPU Frequency: %ld",cpudata.cur_temp/1000,cpudata.cur_freq);
}
// Check if we should increase
if ((cpudata.cur_temp<config.max_temp) && (cpudata.scale_max<cpudata.max_freq))
{
diff=(config.max_temp-cpudata.cur_temp)/1000;
newfreq=cpudata.scale_max+(config.freq_step*diff);
if (newfreq>cpudata.max_freq) newfreq=cpudata.max_freq;
DEBUG1_MAIN("Increase to %ld\n",newfreq);
config.logger("Increase scaling_max_freq to %ld",newfreq);
// Set new value and validate
if (cpufreq_set_long_int("scaling_max_freq",newfreq,100)<0)
{
config.logger("Failed to set scaling_max_freq, exiting");
failsafe(1);
}
cpudata.scale_max=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq");
if ((cpudata.scale_max<VALID_FREQ_MIN) || (cpudata.scale_max>VALID_FREQ_MAX))
{
config.logger("Invalid scale_max_freq reported, exiting");
failsafe(1);
}
}
// Check if we should decrease
if ((cpudata.cur_temp>config.max_temp) && (cpudata.scale_max>cpudata.min_freq))
{
diff=(cpudata.cur_temp-config.max_temp)/1000;
newfreq=cpudata.scale_max-(config.freq_step*diff);
if (newfreq<cpudata.min_freq) newfreq=cpudata.min_freq;
DEBUG1_MAIN("Decrease to %ld\n",newfreq);
config.logger("Decrease scaling_max_freq to %ld",newfreq);
// Set new value and validate
if (cpufreq_set_long_int("scaling_max_freq",newfreq,100)<0)
{
config.logger("Failed to set scaling_max_freq, exiting");
failsafe(1);
}
cpudata.scale_max=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq");
if ((cpudata.scale_max<VALID_FREQ_MIN) || (cpudata.scale_max>VALID_FREQ_MAX))
{
config.logger("Invalid scale_max_freq reported, exiting");
failsafe(1);
}
}
sleep(config.interval);
}
}
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