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/************************************************************************
* This file is part of paramano. *
* *
* paramano 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 3 of the *
* License, or (at your option) any later version. *
* *
* paramano 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 paramano. If not, see *
* <http://www.gnu.org/licenses/>. *
************************************************************************/
#include "paramano.h"
#define MAX_CORES 1000
#define MAX_FREQS 50
#define FREQ_LENGTH 14
char freqs[MAX_CORES][MAX_FREQS][FREQ_LENGTH];
int total_freqs; // Number of freqs for core 0
/***********************************************************************
* Initialise surrounding variables, get available freqs etc
**********************************************************************/
void gf_init()
{
char freq_string[4096]; // POSIX suggested line length. Source of error for CPUs with a huge number of freqs
char *next_token;
unsigned int i;
memset(freqs, '\0', sizeof(freqs));
for(i = 0; (i < gc_number() && i < MAX_CORES); i++)
{
memset(freq_string, '\0', sizeof(freq_string) );
// Get available governor freqs. If no governor, try next cpu
if (gf_available(i, freq_string, sizeof(freq_string) ) == -1)
{
debug("Couldn't find freq scaling on core %d\n",i);
continue;
}
*strchrnul(freq_string, '\n') = '\0';
// freq_string is a space separated list of freqs
// Use strtok to find each
next_token = strtok(freq_string, " \n");
total_freqs = 0;
do
{
//chomp(next_token);
debug("Found frequency #%d (%s KHz)\n",total_freqs,next_token);
strncpy(freqs[i][total_freqs], next_token, FREQ_LENGTH);
total_freqs++;
} while((next_token = strtok(NULL, " ")) != NULL);
}
// Hit the limit of storage of cores' frequencies
if (i == MAX_CORES)
info("Unable to add more than %d cores\n", MAX_CORES);
debug("Found %d frequencies\n",total_freqs);
}
/***********************************************************************
* Return current frequency for core
**********************************************************************/
int gf_current(int core)
{
FILE* fd;
char buff[4096];
char* path;
int freq;
asprintf(&path, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_cur_freq", core);
if(!(fd = fopen(path, "r")))
{
debug("Couldn't open '%s'\n",path);
free(path);
return -1;
}
fgets(buff, 13, fd);
freq = atoi(buff);
fclose(fd);
debug("Found freq %d on core %d\n",freq,core);
free(path);
return freq;
}
/***********************************************************************
* Populate `out` with available frequencies for core
**********************************************************************/
int gf_available(int core, char* out, int size)
{
FILE* fd;
char* path;
asprintf(&path, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_available_frequencies", core);
if(!(fd = fopen(path, "r")))
{
debug("Couldn't open '%s'\n",path);
free(path);
return -1;
}
fgets(out, size, fd);
fclose(fd);
free(path);
return 0;
}
/***********************************************************************
* Populate `out` with a formatted, units-added freq label for `freq`
**********************************************************************/
char* gf_get_frequency_label(int freq)
{
char *string;
if(freq >= 1000000000) // >= 1 billion KHz (1 THz) This, ladies and gentlement, is future-proofing ;)
asprintf(&string, "%.2f THz", (double)freq/1000000000 );
else if(freq >= 1000000) // >= 1 million KHz (1 GHz)
asprintf(&string, "%.2f GHz", (double)freq/1000000 );
else if (freq >= 1000) // >= 1 thousand KHz (1 MHz)
asprintf(&string, "%.2f MHz", (double)freq/1000 );
else // < 1000 KHz (1 MHz)
asprintf(&string, "%.2f KHz", (double)freq);
debug("Prepared freq label '%s' for freq %d\n",string,freq);
return string;
}
/***********************************************************************
* Return freq value at index for core, as a string
**********************************************************************/
char* gf_freqa(int core, int index)
{
return freqs[core][index];
}
/***********************************************************************
* Return freq value at index for core, as an int
**********************************************************************/
int gf_freqi(int core, int index)
{
return atoi(gf_freqa(core, index));
}
/***********************************************************************
* Return total number of frequencies
**********************************************************************/
unsigned int gf_number()
{
return total_freqs;
}
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