tools/power/cpupower/bench/parse.c

   1 /*  cpufreq-bench CPUFreq microbenchmark
   2  *
   3  *  Copyright (C) 2008 Christian Kornacker <ckornacker@suse.de>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <stdarg.h>
  23 #include <string.h>
  24 #include <time.h>
  25 #include <dirent.h>
  26
  27 #include <sys/utsname.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30
  31 #include "parse.h"
  32 #include "config.h"
  33
  34 /**
  35  * converts priority string to priority
  36  *
  37  * @param str string that represents a scheduler priority
  38  *
  39  * @retval priority
  40  * @retval SCHED_ERR when the priority doesn't exit
  41  **/
  42
  43 enum sched_prio string_to_prio(const char *str)
  44 {
  45         if (strncasecmp("high", str, strlen(str)) == 0)
  46                 return  SCHED_HIGH;
  47         else if (strncasecmp("default", str, strlen(str)) == 0)
  48                 return SCHED_DEFAULT;
  49         else if (strncasecmp("low", str, strlen(str)) == 0)
  50                 return SCHED_LOW;
  51         else
  52                 return SCHED_ERR;
  53 }
  54
  55 /**
  56  * create and open logfile
  57  *
  58  * @param dir directory in which the logfile should be created
  59  *
  60  * @retval logfile on success
  61  * @retval NULL when the file can't be created
  62  **/
  63
  64 FILE *prepare_output(const char *dirname)
  65 {
  66         FILE *output = NULL;
  67         int len;
  68         char *filename, *filename_tmp;
  69         struct utsname sysdata;
  70         DIR *dir;
  71
  72         dir = opendir(dirname);
  73         if (dir == NULL) {
  74                 if (mkdir(dirname, 0755)) {
  75                         perror("mkdir");
  76                         fprintf(stderr, "error: Cannot create dir %s\n",
  77                                 dirname);
  78                         return NULL;
  79                 }
  80         }
  81
  82         len = strlen(dirname) + 30;
  83         filename = malloc(sizeof(char) * len);
  84         if (!filename) {
  85                 perror("malloc");
  86                 goto out_dir;
  87         }
  88
  89         if (uname(&sysdata) == 0) {
  90                 len += strlen(sysdata.nodename) + strlen(sysdata.release);
  91                 filename_tmp = realloc(filename, sizeof(*filename) * len);
  92
  93                 if (filename_tmp == NULL) {
  94                         free(filename);
  95                         perror("realloc");
  96                         goto out_dir;
  97                 }
  98
  99                 filename = filename_tmp;
 100                 snprintf(filename, len - 1, "%s/benchmark_%s_%s_%li.log",
 101                         dirname, sysdata.nodename, sysdata.release, time(NULL));
 102         } else {
 103                 snprintf(filename, len - 1, "%s/benchmark_%li.log",
 104                         dirname, time(NULL));
 105         }
 106
 107         dprintf("logfilename: %s\n", filename);
 108
 109         output = fopen(filename, "w+");
 110         if (output == NULL) {
 111                 perror("fopen");
 112                 fprintf(stderr, "error: unable to open logfile\n");
 113                 goto out;
 114         }
 115
 116         fprintf(stdout, "Logfile: %s\n", filename);
 117
 118         fprintf(output, "#round load sleep performance powersave percentage\n");
 119 out:
 120         free(filename);
 121 out_dir:
 122         closedir(dir);
 123         return output;
 124 }
 125
 126 /**
 127  * returns the default config
 128  *
 129  * @retval default config on success
 130  * @retval NULL when the output file can't be created
 131  **/
 132
 133 struct config *prepare_default_config()
 134 {
 135         struct config *config = malloc(sizeof(struct config));
 136
 137         dprintf("loading defaults\n");
 138
 139         config->sleep = 500000;
 140         config->load = 500000;
 141         config->sleep_step = 500000;
 142         config->load_step = 500000;
 143         config->cycles = 5;
 144         config->rounds = 50;
 145         config->cpu = 0;
 146         config->prio = SCHED_HIGH;
 147         config->verbose = 0;
 148         strncpy(config->governor, "ondemand", 8);
 149
 150         config->output = stdout;
 151
 152 #ifdef DEFAULT_CONFIG_FILE
 153         if (prepare_config(DEFAULT_CONFIG_FILE, config))
 154                 return NULL;
 155 #endif
 156         return config;
 157 }
 158
 159 /**
 160  * parses config file and returns the config to the caller
 161  *
 162  * @param path config file name
 163  *
 164  * @retval 1 on error
 165  * @retval 0 on success
 166  **/
 167
 168 int prepare_config(const char *path, struct config *config)
 169 {
 170         size_t len = 0;
 171         char opt[16], val[32], *line = NULL;
 172         FILE *configfile;
 173
 174         if (config == NULL) {
 175                 fprintf(stderr, "error: config is NULL\n");
 176                 return 1;
 177         }
 178
 179         configfile = fopen(path, "r");
 180         if (configfile == NULL) {
 181                 perror("fopen");
 182                 fprintf(stderr, "error: unable to read configfile\n");
 183                 free(config);
 184                 return 1;
 185         }
 186
 187         while (getline(&line, &len, configfile) != -1) {
 188                 if (line[0] == '#' || line[0] == ' ' || line[0] == '\n')
 189                         continue;
 190
 191                 if (sscanf(line, "%14s = %30s", opt, val) < 2)
 192                         continue;
 193
 194                 dprintf("parsing: %s -> %s\n", opt, val);
 195
 196                 if (strcmp("sleep", opt) == 0)
 197                         sscanf(val, "%li", &config->sleep);
 198
 199                 else if (strcmp("load", opt) == 0)
 200                         sscanf(val, "%li", &config->load);
 201
 202                 else if (strcmp("load_step", opt) == 0)
 203                         sscanf(val, "%li", &config->load_step);
 204
 205                 else if (strcmp("sleep_step", opt) == 0)
 206                         sscanf(val, "%li", &config->sleep_step);
 207
 208                 else if (strcmp("cycles", opt) == 0)
 209                         sscanf(val, "%u", &config->cycles);
 210
 211                 else if (strcmp("rounds", opt) == 0)
 212                         sscanf(val, "%u", &config->rounds);
 213
 214                 else if (strcmp("verbose", opt) == 0)
 215                         sscanf(val, "%u", &config->verbose);
 216
 217                 else if (strcmp("output", opt) == 0)
 218                         config->output = prepare_output(val);
 219
 220                 else if (strcmp("cpu", opt) == 0)
 221                         sscanf(val, "%u", &config->cpu);
 222
 223                 else if (strcmp("governor", opt) == 0) {
 224                         strncpy(config->governor, val,
 225                                         sizeof(config->governor));
 226                         config->governor[sizeof(config->governor) - 1] = '\0';
 227                 }
 228
 229                 else if (strcmp("priority", opt) == 0) {
 230                         if (string_to_prio(val) != SCHED_ERR)
 231                                 config->prio = string_to_prio(val);
 232                 }
 233         }
 234
 235         free(line);
 236
 237         return 0;
 238 }