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;
  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
  85         if (uname(&sysdata) == 0) {
  86                 len += strlen(sysdata.nodename) + strlen(sysdata.release);
  87                 filename = realloc(filename, sizeof(char) * len);
  88
  89                 if (filename == NULL) {
  90                         perror("realloc");
  91                         return NULL;
  92                 }
  93
  94                 snprintf(filename, len - 1, "%s/benchmark_%s_%s_%li.log",
  95                         dirname, sysdata.nodename, sysdata.release, time(NULL));
  96         } else {
  97                 snprintf(filename, len - 1, "%s/benchmark_%li.log",
  98                         dirname, time(NULL));
  99         }
 100
 101         dprintf("logilename: %s\n", filename);
 102
 103         output = fopen(filename, "w+");
 104         if (output == NULL) {
 105                 perror("fopen");
 106                 fprintf(stderr, "error: unable to open logfile\n");
 107         }
 108
 109         fprintf(stdout, "Logfile: %s\n", filename);
 110
 111         free(filename);
 112         fprintf(output, "#round load sleep performance powersave percentage\n");
 113         return output;
 114 }
 115
 116 /**
 117  * returns the default config
 118  *
 119  * @retval default config on success
 120  * @retval NULL when the output file can't be created
 121  **/
 122
 123 struct config *prepare_default_config()
 124 {
 125         struct config *config = malloc(sizeof(struct config));
 126
 127         dprintf("loading defaults\n");
 128
 129         config->sleep = 500000;
 130         config->load = 500000;
 131         config->sleep_step = 500000;
 132         config->load_step = 500000;
 133         config->cycles = 5;
 134         config->rounds = 50;
 135         config->cpu = 0;
 136         config->prio = SCHED_HIGH;
 137         config->verbose = 0;
 138         strncpy(config->governor, "ondemand", 8);
 139
 140         config->output = stdout;
 141
 142 #ifdef DEFAULT_CONFIG_FILE
 143         if (prepare_config(DEFAULT_CONFIG_FILE, config))
 144                 return NULL;
 145 #endif
 146         return config;
 147 }
 148
 149 /**
 150  * parses config file and returns the config to the caller
 151  *
 152  * @param path config file name
 153  *
 154  * @retval 1 on error
 155  * @retval 0 on success
 156  **/
 157
 158 int prepare_config(const char *path, struct config *config)
 159 {
 160         size_t len = 0;
 161         char *opt, *val, *line = NULL;
 162         FILE *configfile = fopen(path, "r");
 163
 164         if (config == NULL) {
 165                 fprintf(stderr, "error: config is NULL\n");
 166                 return 1;
 167         }
 168
 169         if (configfile == NULL) {
 170                 perror("fopen");
 171                 fprintf(stderr, "error: unable to read configfile\n");
 172                 free(config);
 173                 return 1;
 174         }
 175
 176         while (getline(&line, &len, configfile) != -1) {
 177                 if (line[0] == '#' || line[0] == ' ')
 178                         continue;
 179
 180                 sscanf(line, "%as = %as", &opt, &val);
 181
 182                 dprintf("parsing: %s -> %s\n", opt, val);
 183
 184                 if (strncmp("sleep", opt, strlen(opt)) == 0)
 185                         sscanf(val, "%li", &config->sleep);
 186
 187                 else if (strncmp("load", opt, strlen(opt)) == 0)
 188                         sscanf(val, "%li", &config->load);
 189
 190                 else if (strncmp("load_step", opt, strlen(opt)) == 0)
 191                         sscanf(val, "%li", &config->load_step);
 192
 193                 else if (strncmp("sleep_step", opt, strlen(opt)) == 0)
 194                         sscanf(val, "%li", &config->sleep_step);
 195
 196                 else if (strncmp("cycles", opt, strlen(opt)) == 0)
 197                         sscanf(val, "%u", &config->cycles);
 198
 199                 else if (strncmp("rounds", opt, strlen(opt)) == 0)
 200                         sscanf(val, "%u", &config->rounds);
 201
 202                 else if (strncmp("verbose", opt, strlen(opt)) == 0)
 203                         sscanf(val, "%u", &config->verbose);
 204
 205                 else if (strncmp("output", opt, strlen(opt)) == 0)
 206                         config->output = prepare_output(val);
 207
 208                 else if (strncmp("cpu", opt, strlen(opt)) == 0)
 209                         sscanf(val, "%u", &config->cpu);
 210
 211                 else if (strncmp("governor", opt, 14) == 0)
 212                         strncpy(config->governor, val, 14);
 213
 214                 else if (strncmp("priority", opt, strlen(opt)) == 0) {
 215                         if (string_to_prio(val) != SCHED_ERR)
 216                                 config->prio = string_to_prio(val);
 217                 }
 218         }
 219
 220         free(line);
 221         free(opt);
 222         free(val);
 223
 224         return 0;
 225 }