5cfd3ae4e6
This way we'll automatically close the files upon exec() Change-Id: Ic0daca8fb56432830de4a2f4a86a77337121ecc7
151 lines
3.7 KiB
C
151 lines
3.7 KiB
C
/***************************************************************************
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* __________ __ ___
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2015 by Udo Schläpfer
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include "config.h"
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#include "cpuinfo-linux.h"
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#include "debug.h"
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#include "cpufreq-linux.h"
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static FILE* open_read(const char* file_name)
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{
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FILE *f = fopen(file_name, "re");
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if(f == NULL)
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{
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DEBUGF("ERROR %s: Can not open %s for reading.", __func__, file_name);
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}
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return f;
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}
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void cpufreq_available_governors(char* governors, int governors_size, int cpu)
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{
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if(governors_size <= 0)
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{
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DEBUGF("ERROR %s: Invalid governors_size: %d.", __func__, governors_size);
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return;
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}
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if(cpu < 0)
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{
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DEBUGF("ERROR %s: Invalid cpu: %d.", __func__, cpu);
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return;
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}
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char available_governors_interface[70];
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snprintf(available_governors_interface,
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sizeof(available_governors_interface),
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"/sys/devices/system/cpu/cpu%d/cpufreq/scaling_available_governors",
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cpu & 0xFFFF);
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FILE *f = open_read(available_governors_interface);
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if(f == NULL)
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{
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return;
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}
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if(fgets(governors, governors_size, f) == NULL)
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{
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DEBUGF("ERROR %s: Read failed for %s.", __func__, available_governors_interface);
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fclose(f);
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return;
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}
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DEBUGF("DEBUG %s: Available governors for cpu %d: %s.", __func__, cpu, governors);
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fclose(f);
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}
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static FILE* open_write(const char* file_name)
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{
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FILE *f = fopen(file_name, "we");
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if(f == NULL)
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{
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DEBUGF("ERROR %s: Can not open %s for writing.", __func__, file_name);
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}
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return f;
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}
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static void set_governor_for_cpu(const char* governor, int cpu)
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{
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DEBUGF("DEBUG %s: governor: %s, cpu: %d.", __func__, governor, cpu);
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char scaling_governor_interface[64];
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snprintf(scaling_governor_interface,
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sizeof(scaling_governor_interface),
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"/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor",
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cpu);
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FILE *f = open_write(scaling_governor_interface);
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if(f == NULL)
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{
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return;
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}
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if(fprintf(f, "%s", governor) < 1)
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{
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DEBUGF("ERROR %s: Write failed for %s.", __func__, scaling_governor_interface);
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}
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fclose(f);
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}
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void cpufreq_set_governor(const char* governor, int cpu)
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{
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if(governor == NULL)
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{
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DEBUGF("ERROR %s: Invalid governor.", __func__);
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return;
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}
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if(cpu < CPUFREQ_ALL_CPUS)
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{
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DEBUGF("ERROR %s: Invalid cpu: %d.", __func__, cpu);
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return;
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}
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DEBUGF("DEBUG %s: governor: %s, cpu: %d.", __func__, governor, cpu);
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if(cpu == CPUFREQ_ALL_CPUS)
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{
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int max_cpu = cpucount_linux();
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for(int count = 0; count < max_cpu; ++count)
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{
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set_governor_for_cpu(governor, count);
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}
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}
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else
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{
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set_governor_for_cpu(governor, cpu);
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}
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}
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