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
43enum 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
64FILE *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
123struct 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
158int prepare_config(const char *path, struct config *config)
159{
160	size_t len = 0;
161	char opt[16], val[32], *line = NULL;
162	FILE *configfile;
163
164	if (config == NULL) {
165		fprintf(stderr, "error: config is NULL\n");
166		return 1;
167	}
168
169	configfile = fopen(path, "r");
170	if (configfile == NULL) {
171		perror("fopen");
172		fprintf(stderr, "error: unable to read configfile\n");
173		free(config);
174		return 1;
175	}
176
177	while (getline(&line, &len, configfile) != -1) {
178		if (line[0] == '#' || line[0] == ' ' || line[0] == '\n')
179			continue;
180
181		if (sscanf(line, "%14s = %30s", opt, val) < 2)
182			continue;
183
184		dprintf("parsing: %s -> %s\n", opt, val);
185
186		if (strcmp("sleep", opt) == 0)
187			sscanf(val, "%li", &config->sleep);
188
189		else if (strcmp("load", opt) == 0)
190			sscanf(val, "%li", &config->load);
191
192		else if (strcmp("load_step", opt) == 0)
193			sscanf(val, "%li", &config->load_step);
194
195		else if (strcmp("sleep_step", opt) == 0)
196			sscanf(val, "%li", &config->sleep_step);
197
198		else if (strcmp("cycles", opt) == 0)
199			sscanf(val, "%u", &config->cycles);
200
201		else if (strcmp("rounds", opt) == 0)
202			sscanf(val, "%u", &config->rounds);
203
204		else if (strcmp("verbose", opt) == 0)
205			sscanf(val, "%u", &config->verbose);
206
207		else if (strcmp("output", opt) == 0)
208			config->output = prepare_output(val);
209
210		else if (strcmp("cpu", opt) == 0)
211			sscanf(val, "%u", &config->cpu);
212
213		else if (strcmp("governor", opt) == 0) {
214			strncpy(config->governor, val,
215					sizeof(config->governor));
216			config->governor[sizeof(config->governor) - 1] = '\0';
217		}
218
219		else if (strcmp("priority", opt) == 0) {
220			if (string_to_prio(val) != SCHED_ERR)
221				config->prio = string_to_prio(val);
222		}
223	}
224
225	free(line);
226
227	return 0;
228}
229