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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* cpufreq-bench CPUFreq microbenchmark
3 *
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 priority
23 *
24 * @param str string that represents a scheduler priority
25 *
26 * @retval priority
27 * @retval SCHED_ERR when the priority doesn't exit
28 **/
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 else
39 return SCHED_ERR;
40}
41
42/**
43 * create and open logfile
44 *
45 * @param dir directory in which the logfile should be created
46 *
47 * @retval logfile on success
48 * @retval NULL when the file can't be created
49 **/
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 config
115 *
116 * @retval default config on success
117 * @retval NULL when the output file can't be created
118 **/
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_FILE
140 if (prepare_config(DEFAULT_CONFIG_FILE, config))
141 return NULL;
142#endif
143 return config;
144}
145
146/**
147 * parses config file and returns the config to the caller
148 *
149 * @param path config file name
150 *
151 * @retval 1 on error
152 * @retval 0 on success
153 **/
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}