226 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/* cpufreq-bench CPUFreq microbenchmark3 *4 * Copyright (C) 2008 Christian Kornacker <ckornacker@suse.de>5 */6 7#include <stdio.h>8#include <stdlib.h>9#include <stdarg.h>10#include <string.h>11#include <time.h>12#include <dirent.h>13 14#include <sys/utsname.h>15#include <sys/types.h>16#include <sys/stat.h>17 18#include "parse.h"19#include "config.h"20 21/**22 * converts priority string to priority23 *24 * @param str string that represents a scheduler priority25 *26 * @retval priority27 * @retval SCHED_ERR when the priority doesn't exit28 **/29 30enum sched_prio string_to_prio(const char *str)31{32 if (strncasecmp("high", str, strlen(str)) == 0)33 return SCHED_HIGH;34 else if (strncasecmp("default", str, strlen(str)) == 0)35 return SCHED_DEFAULT;36 else if (strncasecmp("low", str, strlen(str)) == 0)37 return SCHED_LOW;38 else39 return SCHED_ERR;40}41 42/**43 * create and open logfile44 *45 * @param dir directory in which the logfile should be created46 *47 * @retval logfile on success48 * @retval NULL when the file can't be created49 **/50 51FILE *prepare_output(const char *dirname)52{53 FILE *output = NULL;54 int len;55 char *filename, *filename_tmp;56 struct utsname sysdata;57 DIR *dir;58 59 dir = opendir(dirname);60 if (dir == NULL) {61 if (mkdir(dirname, 0755)) {62 perror("mkdir");63 fprintf(stderr, "error: Cannot create dir %s\n",64 dirname);65 return NULL;66 }67 }68 69 len = strlen(dirname) + 30;70 filename = malloc(sizeof(char) * len);71 if (!filename) {72 perror("malloc");73 goto out_dir;74 }75 76 if (uname(&sysdata) == 0) {77 len += strlen(sysdata.nodename) + strlen(sysdata.release);78 filename_tmp = realloc(filename, sizeof(*filename) * len);79 80 if (filename_tmp == NULL) {81 free(filename);82 perror("realloc");83 goto out_dir;84 }85 86 filename = filename_tmp;87 snprintf(filename, len - 1, "%s/benchmark_%s_%s_%li.log",88 dirname, sysdata.nodename, sysdata.release, time(NULL));89 } else {90 snprintf(filename, len - 1, "%s/benchmark_%li.log",91 dirname, time(NULL));92 }93 94 dprintf("logfilename: %s\n", filename);95 96 output = fopen(filename, "w+");97 if (output == NULL) {98 perror("fopen");99 fprintf(stderr, "error: unable to open logfile\n");100 goto out;101 }102 103 fprintf(stdout, "Logfile: %s\n", filename);104 105 fprintf(output, "#round load sleep performance powersave percentage\n");106out:107 free(filename);108out_dir:109 closedir(dir);110 return output;111}112 113/**114 * returns the default config115 *116 * @retval default config on success117 * @retval NULL when the output file can't be created118 **/119 120struct config *prepare_default_config()121{122 struct config *config = malloc(sizeof(struct config));123 124 dprintf("loading defaults\n");125 126 config->sleep = 500000;127 config->load = 500000;128 config->sleep_step = 500000;129 config->load_step = 500000;130 config->cycles = 5;131 config->rounds = 50;132 config->cpu = 0;133 config->prio = SCHED_HIGH;134 config->verbose = 0;135 strncpy(config->governor, "ondemand", sizeof(config->governor));136 137 config->output = stdout;138 139#ifdef DEFAULT_CONFIG_FILE140 if (prepare_config(DEFAULT_CONFIG_FILE, config))141 return NULL;142#endif143 return config;144}145 146/**147 * parses config file and returns the config to the caller148 *149 * @param path config file name150 *151 * @retval 1 on error152 * @retval 0 on success153 **/154 155int prepare_config(const char *path, struct config *config)156{157 size_t len = 0;158 char opt[16], val[32], *line = NULL;159 FILE *configfile;160 161 if (config == NULL) {162 fprintf(stderr, "error: config is NULL\n");163 return 1;164 }165 166 configfile = fopen(path, "r");167 if (configfile == NULL) {168 perror("fopen");169 fprintf(stderr, "error: unable to read configfile\n");170 free(config);171 return 1;172 }173 174 while (getline(&line, &len, configfile) != -1) {175 if (line[0] == '#' || line[0] == ' ' || line[0] == '\n')176 continue;177 178 if (sscanf(line, "%14s = %30s", opt, val) < 2)179 continue;180 181 dprintf("parsing: %s -> %s\n", opt, val);182 183 if (strcmp("sleep", opt) == 0)184 sscanf(val, "%li", &config->sleep);185 186 else if (strcmp("load", opt) == 0)187 sscanf(val, "%li", &config->load);188 189 else if (strcmp("load_step", opt) == 0)190 sscanf(val, "%li", &config->load_step);191 192 else if (strcmp("sleep_step", opt) == 0)193 sscanf(val, "%li", &config->sleep_step);194 195 else if (strcmp("cycles", opt) == 0)196 sscanf(val, "%u", &config->cycles);197 198 else if (strcmp("rounds", opt) == 0)199 sscanf(val, "%u", &config->rounds);200 201 else if (strcmp("verbose", opt) == 0)202 sscanf(val, "%u", &config->verbose);203 204 else if (strcmp("output", opt) == 0)205 config->output = prepare_output(val); 206 207 else if (strcmp("cpu", opt) == 0)208 sscanf(val, "%u", &config->cpu);209 210 else if (strcmp("governor", opt) == 0) {211 strncpy(config->governor, val,212 sizeof(config->governor));213 config->governor[sizeof(config->governor) - 1] = '\0';214 }215 216 else if (strcmp("priority", opt) == 0) {217 if (string_to_prio(val) != SCHED_ERR)218 config->prio = string_to_prio(val);219 }220 }221 222 free(line);223 224 return 0;225}226