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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include "sysfs.h"
#include "cpufreq.h"
#include "debug.h"
#include "cputemp2maxfreq.h"
#include "failsafe.h"
#include "version.h"
// Valid frequencies are between 100MHz and 10GHz
#define VALID_FREQ_MIN 100000
#define VALID_FREQ_MAX 10000000
// Valid temperatures are between 10 and 150 degrees
#define VALID_TEMP_MIN 10000
#define VALID_TEMP_MAX 150000
struct s_cpudata cpudata;
struct s_config config={"conservative",70000,"/sys/devices/virtual/thermal/thermal_zone0/temp",100000,2000000,10};
int main()
{
long int diff;
long int newfreq;
printf("Version %s, buildtime %s %s\n",version(),__DATE__,__TIME__);
// Print configuration
printf("Configuration:\n");
printf("Governor: %s\n",config.governor);
printf("Temperature: %ld\n",config.max_temp);
printf("Temp input: %s\n",config.temp_input);
printf("Frequency step: %ld\n",config.freq_step);
printf("Fallback frquency: %ld\n",config.fallback_freq);
printf("Interval: %d\n",config.interval);
// 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");
printf("\nCPU data:\n");
printf("Minimum frequency: %ld\n",cpudata.min_freq);
printf("Maximum frequency: %ld\n",cpudata.max_freq);
printf("Scaling maximum frequency: %ld\n",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
printf("Invalid CPU data, exiting.\n");
exit(1);
}
// Set the governor
if (cpufreq_set_str("scaling_governor",config.governor,0)<0)
{
printf("Failed to set governor, error %d (%s).\n",errno,strerror(errno));
// We failed to set the governor, call the failsafe
failsafe(1);
}
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))
{
printf("Invalid current frequency reported by CPU, exiting.\n");
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))
{
printf("Invalid current tempature reported by CPU, exiting.\n");
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);
// 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);
// Set new value and validate
if (cpufreq_set_long_int("scaling_max_freq",newfreq,100)<0)
{
printf("Failed to set scaling_max_freq, exiting.\n");
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))
{
printf("Invalid scale_max_freq reported, exiting,\n");
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);
// Set new value and validate
if (cpufreq_set_long_int("scaling_max_freq",newfreq,100)<0)
{
printf("Failed to set scaling_max_freq, exiting.\n");
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))
{
printf("Invalid scale_max_freq reported, exiting,\n");
failsafe(1);
}
}
sleep(config.interval);
}
}
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