Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de> |
| 3 | * |
| 4 | * Licensed under the terms of the GNU GPL License version 2. |
| 5 | */ |
| 6 | |
| 7 | #include <stdio.h> |
| 8 | #include <errno.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <string.h> |
| 11 | #include <limits.h> |
| 12 | #include <sys/types.h> |
| 13 | #include <sys/stat.h> |
| 14 | #include <fcntl.h> |
| 15 | #include <unistd.h> |
| 16 | |
| 17 | #include "cpufreq.h" |
| 18 | |
| 19 | #define PATH_TO_CPU "/sys/devices/system/cpu/" |
Roman Vasiyarov | 76b659a | 2011-04-25 21:34:23 +0400 | [diff] [blame] | 20 | #define MAX_LINE_LEN 4096 |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 21 | #define SYSFS_PATH_MAX 255 |
| 22 | |
| 23 | |
| 24 | static unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen) |
| 25 | { |
| 26 | int fd; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 27 | ssize_t numread; |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 28 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 29 | fd = open(path, O_RDONLY); |
| 30 | if (fd == -1) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 31 | return 0; |
| 32 | |
| 33 | numread = read(fd, buf, buflen - 1); |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 34 | if (numread < 1) { |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 35 | close(fd); |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | buf[numread] = '\0'; |
| 40 | close(fd); |
| 41 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 42 | return (unsigned int) numread; |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 43 | } |
| 44 | |
| 45 | |
| 46 | /* CPUFREQ sysfs access **************************************************/ |
| 47 | |
| 48 | /* helper function to read file from /sys into given buffer */ |
| 49 | /* fname is a relative path under "cpuX/cpufreq" dir */ |
| 50 | static unsigned int sysfs_cpufreq_read_file(unsigned int cpu, const char *fname, |
| 51 | char *buf, size_t buflen) |
| 52 | { |
| 53 | char path[SYSFS_PATH_MAX]; |
| 54 | |
| 55 | snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpufreq/%s", |
| 56 | cpu, fname); |
| 57 | return sysfs_read_file(path, buf, buflen); |
| 58 | } |
| 59 | |
| 60 | /* helper function to write a new value to a /sys file */ |
| 61 | /* fname is a relative path under "cpuX/cpufreq" dir */ |
| 62 | static unsigned int sysfs_cpufreq_write_file(unsigned int cpu, |
| 63 | const char *fname, |
| 64 | const char *value, size_t len) |
| 65 | { |
| 66 | char path[SYSFS_PATH_MAX]; |
| 67 | int fd; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 68 | ssize_t numwrite; |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 69 | |
| 70 | snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpufreq/%s", |
| 71 | cpu, fname); |
| 72 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 73 | fd = open(path, O_WRONLY); |
| 74 | if (fd == -1) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 75 | return 0; |
| 76 | |
| 77 | numwrite = write(fd, value, len); |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 78 | if (numwrite < 1) { |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 79 | close(fd); |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | close(fd); |
| 84 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 85 | return (unsigned int) numwrite; |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 86 | } |
| 87 | |
| 88 | /* read access to files which contain one numeric value */ |
| 89 | |
| 90 | enum cpufreq_value { |
| 91 | CPUINFO_CUR_FREQ, |
| 92 | CPUINFO_MIN_FREQ, |
| 93 | CPUINFO_MAX_FREQ, |
| 94 | CPUINFO_LATENCY, |
| 95 | SCALING_CUR_FREQ, |
| 96 | SCALING_MIN_FREQ, |
| 97 | SCALING_MAX_FREQ, |
| 98 | STATS_NUM_TRANSITIONS, |
| 99 | MAX_CPUFREQ_VALUE_READ_FILES |
| 100 | }; |
| 101 | |
| 102 | static const char *cpufreq_value_files[MAX_CPUFREQ_VALUE_READ_FILES] = { |
| 103 | [CPUINFO_CUR_FREQ] = "cpuinfo_cur_freq", |
| 104 | [CPUINFO_MIN_FREQ] = "cpuinfo_min_freq", |
| 105 | [CPUINFO_MAX_FREQ] = "cpuinfo_max_freq", |
| 106 | [CPUINFO_LATENCY] = "cpuinfo_transition_latency", |
| 107 | [SCALING_CUR_FREQ] = "scaling_cur_freq", |
| 108 | [SCALING_MIN_FREQ] = "scaling_min_freq", |
| 109 | [SCALING_MAX_FREQ] = "scaling_max_freq", |
| 110 | [STATS_NUM_TRANSITIONS] = "stats/total_trans" |
| 111 | }; |
| 112 | |
| 113 | |
| 114 | static unsigned long sysfs_cpufreq_get_one_value(unsigned int cpu, |
| 115 | enum cpufreq_value which) |
| 116 | { |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 117 | unsigned long value; |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 118 | unsigned int len; |
| 119 | char linebuf[MAX_LINE_LEN]; |
| 120 | char *endp; |
| 121 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 122 | if (which >= MAX_CPUFREQ_VALUE_READ_FILES) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 123 | return 0; |
| 124 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 125 | len = sysfs_cpufreq_read_file(cpu, cpufreq_value_files[which], |
| 126 | linebuf, sizeof(linebuf)); |
| 127 | |
| 128 | if (len == 0) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 129 | return 0; |
| 130 | |
| 131 | value = strtoul(linebuf, &endp, 0); |
| 132 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 133 | if (endp == linebuf || errno == ERANGE) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 134 | return 0; |
| 135 | |
| 136 | return value; |
| 137 | } |
| 138 | |
| 139 | /* read access to files which contain one string */ |
| 140 | |
| 141 | enum cpufreq_string { |
| 142 | SCALING_DRIVER, |
| 143 | SCALING_GOVERNOR, |
| 144 | MAX_CPUFREQ_STRING_FILES |
| 145 | }; |
| 146 | |
| 147 | static const char *cpufreq_string_files[MAX_CPUFREQ_STRING_FILES] = { |
| 148 | [SCALING_DRIVER] = "scaling_driver", |
| 149 | [SCALING_GOVERNOR] = "scaling_governor", |
| 150 | }; |
| 151 | |
| 152 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 153 | static char *sysfs_cpufreq_get_one_string(unsigned int cpu, |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 154 | enum cpufreq_string which) |
| 155 | { |
| 156 | char linebuf[MAX_LINE_LEN]; |
| 157 | char *result; |
| 158 | unsigned int len; |
| 159 | |
| 160 | if (which >= MAX_CPUFREQ_STRING_FILES) |
| 161 | return NULL; |
| 162 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 163 | len = sysfs_cpufreq_read_file(cpu, cpufreq_string_files[which], |
| 164 | linebuf, sizeof(linebuf)); |
| 165 | if (len == 0) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 166 | return NULL; |
| 167 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 168 | result = strdup(linebuf); |
| 169 | if (result == NULL) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 170 | return NULL; |
| 171 | |
| 172 | if (result[strlen(result) - 1] == '\n') |
| 173 | result[strlen(result) - 1] = '\0'; |
| 174 | |
| 175 | return result; |
| 176 | } |
| 177 | |
| 178 | /* write access */ |
| 179 | |
| 180 | enum cpufreq_write { |
| 181 | WRITE_SCALING_MIN_FREQ, |
| 182 | WRITE_SCALING_MAX_FREQ, |
| 183 | WRITE_SCALING_GOVERNOR, |
| 184 | WRITE_SCALING_SET_SPEED, |
| 185 | MAX_CPUFREQ_WRITE_FILES |
| 186 | }; |
| 187 | |
| 188 | static const char *cpufreq_write_files[MAX_CPUFREQ_WRITE_FILES] = { |
| 189 | [WRITE_SCALING_MIN_FREQ] = "scaling_min_freq", |
| 190 | [WRITE_SCALING_MAX_FREQ] = "scaling_max_freq", |
| 191 | [WRITE_SCALING_GOVERNOR] = "scaling_governor", |
| 192 | [WRITE_SCALING_SET_SPEED] = "scaling_setspeed", |
| 193 | }; |
| 194 | |
| 195 | static int sysfs_cpufreq_write_one_value(unsigned int cpu, |
| 196 | enum cpufreq_write which, |
| 197 | const char *new_value, size_t len) |
| 198 | { |
| 199 | if (which >= MAX_CPUFREQ_WRITE_FILES) |
| 200 | return 0; |
| 201 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 202 | if (sysfs_cpufreq_write_file(cpu, cpufreq_write_files[which], |
| 203 | new_value, len) != len) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 204 | return -ENODEV; |
| 205 | |
| 206 | return 0; |
| 207 | }; |
| 208 | |
| 209 | unsigned long sysfs_get_freq_kernel(unsigned int cpu) |
| 210 | { |
| 211 | return sysfs_cpufreq_get_one_value(cpu, SCALING_CUR_FREQ); |
| 212 | } |
| 213 | |
| 214 | unsigned long sysfs_get_freq_hardware(unsigned int cpu) |
| 215 | { |
| 216 | return sysfs_cpufreq_get_one_value(cpu, CPUINFO_CUR_FREQ); |
| 217 | } |
| 218 | |
| 219 | unsigned long sysfs_get_freq_transition_latency(unsigned int cpu) |
| 220 | { |
| 221 | return sysfs_cpufreq_get_one_value(cpu, CPUINFO_LATENCY); |
| 222 | } |
| 223 | |
| 224 | int sysfs_get_freq_hardware_limits(unsigned int cpu, |
| 225 | unsigned long *min, |
| 226 | unsigned long *max) |
| 227 | { |
| 228 | if ((!min) || (!max)) |
| 229 | return -EINVAL; |
| 230 | |
| 231 | *min = sysfs_cpufreq_get_one_value(cpu, CPUINFO_MIN_FREQ); |
| 232 | if (!*min) |
| 233 | return -ENODEV; |
| 234 | |
| 235 | *max = sysfs_cpufreq_get_one_value(cpu, CPUINFO_MAX_FREQ); |
| 236 | if (!*max) |
| 237 | return -ENODEV; |
| 238 | |
| 239 | return 0; |
| 240 | } |
| 241 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 242 | char *sysfs_get_freq_driver(unsigned int cpu) |
| 243 | { |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 244 | return sysfs_cpufreq_get_one_string(cpu, SCALING_DRIVER); |
| 245 | } |
| 246 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 247 | struct cpufreq_policy *sysfs_get_freq_policy(unsigned int cpu) |
| 248 | { |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 249 | struct cpufreq_policy *policy; |
| 250 | |
| 251 | policy = malloc(sizeof(struct cpufreq_policy)); |
| 252 | if (!policy) |
| 253 | return NULL; |
| 254 | |
| 255 | policy->governor = sysfs_cpufreq_get_one_string(cpu, SCALING_GOVERNOR); |
| 256 | if (!policy->governor) { |
| 257 | free(policy); |
| 258 | return NULL; |
| 259 | } |
| 260 | policy->min = sysfs_cpufreq_get_one_value(cpu, SCALING_MIN_FREQ); |
| 261 | policy->max = sysfs_cpufreq_get_one_value(cpu, SCALING_MAX_FREQ); |
| 262 | if ((!policy->min) || (!policy->max)) { |
| 263 | free(policy->governor); |
| 264 | free(policy); |
| 265 | return NULL; |
| 266 | } |
| 267 | |
| 268 | return policy; |
| 269 | } |
| 270 | |
| 271 | struct cpufreq_available_governors * |
| 272 | sysfs_get_freq_available_governors(unsigned int cpu) { |
| 273 | struct cpufreq_available_governors *first = NULL; |
| 274 | struct cpufreq_available_governors *current = NULL; |
| 275 | char linebuf[MAX_LINE_LEN]; |
| 276 | unsigned int pos, i; |
| 277 | unsigned int len; |
| 278 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 279 | len = sysfs_cpufreq_read_file(cpu, "scaling_available_governors", |
| 280 | linebuf, sizeof(linebuf)); |
| 281 | if (len == 0) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 282 | return NULL; |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 283 | |
| 284 | pos = 0; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 285 | for (i = 0; i < len; i++) { |
| 286 | if (linebuf[i] == ' ' || linebuf[i] == '\n') { |
| 287 | if (i - pos < 2) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 288 | continue; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 289 | if (current) { |
| 290 | current->next = malloc(sizeof(*current)); |
| 291 | if (!current->next) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 292 | goto error_out; |
| 293 | current = current->next; |
| 294 | } else { |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 295 | first = malloc(sizeof(*first)); |
| 296 | if (!first) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 297 | goto error_out; |
| 298 | current = first; |
| 299 | } |
| 300 | current->first = first; |
| 301 | current->next = NULL; |
| 302 | |
| 303 | current->governor = malloc(i - pos + 1); |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 304 | if (!current->governor) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 305 | goto error_out; |
| 306 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 307 | memcpy(current->governor, linebuf + pos, i - pos); |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 308 | current->governor[i - pos] = '\0'; |
| 309 | pos = i + 1; |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | return first; |
| 314 | |
| 315 | error_out: |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 316 | while (first) { |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 317 | current = first->next; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 318 | if (first->governor) |
| 319 | free(first->governor); |
| 320 | free(first); |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 321 | first = current; |
| 322 | } |
| 323 | return NULL; |
| 324 | } |
| 325 | |
| 326 | |
| 327 | struct cpufreq_available_frequencies * |
| 328 | sysfs_get_available_frequencies(unsigned int cpu) { |
| 329 | struct cpufreq_available_frequencies *first = NULL; |
| 330 | struct cpufreq_available_frequencies *current = NULL; |
| 331 | char one_value[SYSFS_PATH_MAX]; |
| 332 | char linebuf[MAX_LINE_LEN]; |
| 333 | unsigned int pos, i; |
| 334 | unsigned int len; |
| 335 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 336 | len = sysfs_cpufreq_read_file(cpu, "scaling_available_frequencies", |
| 337 | linebuf, sizeof(linebuf)); |
| 338 | if (len == 0) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 339 | return NULL; |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 340 | |
| 341 | pos = 0; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 342 | for (i = 0; i < len; i++) { |
| 343 | if (linebuf[i] == ' ' || linebuf[i] == '\n') { |
| 344 | if (i - pos < 2) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 345 | continue; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 346 | if (i - pos >= SYSFS_PATH_MAX) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 347 | goto error_out; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 348 | if (current) { |
| 349 | current->next = malloc(sizeof(*current)); |
| 350 | if (!current->next) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 351 | goto error_out; |
| 352 | current = current->next; |
| 353 | } else { |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 354 | first = malloc(sizeof(*first)); |
| 355 | if (!first) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 356 | goto error_out; |
| 357 | current = first; |
| 358 | } |
| 359 | current->first = first; |
| 360 | current->next = NULL; |
| 361 | |
| 362 | memcpy(one_value, linebuf + pos, i - pos); |
| 363 | one_value[i - pos] = '\0'; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 364 | if (sscanf(one_value, "%lu", ¤t->frequency) != 1) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 365 | goto error_out; |
| 366 | |
| 367 | pos = i + 1; |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | return first; |
| 372 | |
| 373 | error_out: |
| 374 | while (first) { |
| 375 | current = first->next; |
| 376 | free(first); |
| 377 | first = current; |
| 378 | } |
| 379 | return NULL; |
| 380 | } |
| 381 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 382 | static struct cpufreq_affected_cpus *sysfs_get_cpu_list(unsigned int cpu, |
| 383 | const char *file) |
| 384 | { |
| 385 | struct cpufreq_affected_cpus *first = NULL; |
| 386 | struct cpufreq_affected_cpus *current = NULL; |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 387 | char one_value[SYSFS_PATH_MAX]; |
| 388 | char linebuf[MAX_LINE_LEN]; |
| 389 | unsigned int pos, i; |
| 390 | unsigned int len; |
| 391 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 392 | len = sysfs_cpufreq_read_file(cpu, file, linebuf, sizeof(linebuf)); |
| 393 | if (len == 0) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 394 | return NULL; |
| 395 | |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 396 | pos = 0; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 397 | for (i = 0; i < len; i++) { |
| 398 | if (i == len || linebuf[i] == ' ' || linebuf[i] == '\n') { |
| 399 | if (i - pos < 1) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 400 | continue; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 401 | if (i - pos >= SYSFS_PATH_MAX) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 402 | goto error_out; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 403 | if (current) { |
| 404 | current->next = malloc(sizeof(*current)); |
| 405 | if (!current->next) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 406 | goto error_out; |
| 407 | current = current->next; |
| 408 | } else { |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 409 | first = malloc(sizeof(*first)); |
| 410 | if (!first) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 411 | goto error_out; |
| 412 | current = first; |
| 413 | } |
| 414 | current->first = first; |
| 415 | current->next = NULL; |
| 416 | |
| 417 | memcpy(one_value, linebuf + pos, i - pos); |
| 418 | one_value[i - pos] = '\0'; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 419 | |
| 420 | if (sscanf(one_value, "%u", ¤t->cpu) != 1) |
| 421 | goto error_out; |
| 422 | |
| 423 | pos = i + 1; |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | return first; |
| 428 | |
| 429 | error_out: |
| 430 | while (first) { |
| 431 | current = first->next; |
| 432 | free(first); |
| 433 | first = current; |
| 434 | } |
| 435 | return NULL; |
| 436 | } |
| 437 | |
| 438 | struct cpufreq_affected_cpus *sysfs_get_freq_affected_cpus(unsigned int cpu) |
| 439 | { |
| 440 | return sysfs_get_cpu_list(cpu, "affected_cpus"); |
| 441 | } |
| 442 | |
| 443 | struct cpufreq_affected_cpus *sysfs_get_freq_related_cpus(unsigned int cpu) |
| 444 | { |
| 445 | return sysfs_get_cpu_list(cpu, "related_cpus"); |
| 446 | } |
| 447 | |
| 448 | struct cpufreq_stats *sysfs_get_freq_stats(unsigned int cpu, |
| 449 | unsigned long long *total_time) { |
| 450 | struct cpufreq_stats *first = NULL; |
| 451 | struct cpufreq_stats *current = NULL; |
| 452 | char one_value[SYSFS_PATH_MAX]; |
| 453 | char linebuf[MAX_LINE_LEN]; |
| 454 | unsigned int pos, i; |
| 455 | unsigned int len; |
| 456 | |
| 457 | len = sysfs_cpufreq_read_file(cpu, "stats/time_in_state", |
| 458 | linebuf, sizeof(linebuf)); |
| 459 | if (len == 0) |
| 460 | return NULL; |
| 461 | |
| 462 | *total_time = 0; |
| 463 | pos = 0; |
| 464 | for (i = 0; i < len; i++) { |
| 465 | if (i == strlen(linebuf) || linebuf[i] == '\n') { |
| 466 | if (i - pos < 2) |
| 467 | continue; |
| 468 | if ((i - pos) >= SYSFS_PATH_MAX) |
| 469 | goto error_out; |
| 470 | if (current) { |
| 471 | current->next = malloc(sizeof(*current)); |
| 472 | if (!current->next) |
| 473 | goto error_out; |
| 474 | current = current->next; |
| 475 | } else { |
| 476 | first = malloc(sizeof(*first)); |
| 477 | if (!first) |
| 478 | goto error_out; |
| 479 | current = first; |
| 480 | } |
| 481 | current->first = first; |
| 482 | current->next = NULL; |
| 483 | |
| 484 | memcpy(one_value, linebuf + pos, i - pos); |
| 485 | one_value[i - pos] = '\0'; |
| 486 | if (sscanf(one_value, "%lu %llu", |
| 487 | ¤t->frequency, |
| 488 | ¤t->time_in_state) != 2) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 489 | goto error_out; |
| 490 | |
| 491 | *total_time = *total_time + current->time_in_state; |
| 492 | pos = i + 1; |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | return first; |
| 497 | |
| 498 | error_out: |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 499 | while (first) { |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 500 | current = first->next; |
| 501 | free(first); |
| 502 | first = current; |
| 503 | } |
| 504 | return NULL; |
| 505 | } |
| 506 | |
| 507 | unsigned long sysfs_get_freq_transitions(unsigned int cpu) |
| 508 | { |
| 509 | return sysfs_cpufreq_get_one_value(cpu, STATS_NUM_TRANSITIONS); |
| 510 | } |
| 511 | |
| 512 | static int verify_gov(char *new_gov, char *passed_gov) |
| 513 | { |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 514 | unsigned int i, j = 0; |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 515 | |
| 516 | if (!passed_gov || (strlen(passed_gov) > 19)) |
| 517 | return -EINVAL; |
| 518 | |
| 519 | strncpy(new_gov, passed_gov, 20); |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 520 | for (i = 0; i < 20; i++) { |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 521 | if (j) { |
| 522 | new_gov[i] = '\0'; |
| 523 | continue; |
| 524 | } |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 525 | if ((new_gov[i] >= 'a') && (new_gov[i] <= 'z')) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 526 | continue; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 527 | |
| 528 | if ((new_gov[i] >= 'A') && (new_gov[i] <= 'Z')) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 529 | continue; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 530 | |
| 531 | if (new_gov[i] == '-') |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 532 | continue; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 533 | |
| 534 | if (new_gov[i] == '_') |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 535 | continue; |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 536 | |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 537 | if (new_gov[i] == '\0') { |
| 538 | j = 1; |
| 539 | continue; |
| 540 | } |
| 541 | return -EINVAL; |
| 542 | } |
| 543 | new_gov[19] = '\0'; |
| 544 | return 0; |
| 545 | } |
| 546 | |
| 547 | int sysfs_modify_freq_policy_governor(unsigned int cpu, char *governor) |
| 548 | { |
| 549 | char new_gov[SYSFS_PATH_MAX]; |
| 550 | |
| 551 | if (!governor) |
| 552 | return -EINVAL; |
| 553 | |
| 554 | if (verify_gov(new_gov, governor)) |
| 555 | return -EINVAL; |
| 556 | |
| 557 | return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_GOVERNOR, |
| 558 | new_gov, strlen(new_gov)); |
| 559 | }; |
| 560 | |
| 561 | int sysfs_modify_freq_policy_max(unsigned int cpu, unsigned long max_freq) |
| 562 | { |
| 563 | char value[SYSFS_PATH_MAX]; |
| 564 | |
| 565 | snprintf(value, SYSFS_PATH_MAX, "%lu", max_freq); |
| 566 | |
| 567 | return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MAX_FREQ, |
| 568 | value, strlen(value)); |
| 569 | }; |
| 570 | |
| 571 | |
| 572 | int sysfs_modify_freq_policy_min(unsigned int cpu, unsigned long min_freq) |
| 573 | { |
| 574 | char value[SYSFS_PATH_MAX]; |
| 575 | |
| 576 | snprintf(value, SYSFS_PATH_MAX, "%lu", min_freq); |
| 577 | |
| 578 | return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MIN_FREQ, |
| 579 | value, strlen(value)); |
| 580 | }; |
| 581 | |
| 582 | |
| 583 | int sysfs_set_freq_policy(unsigned int cpu, struct cpufreq_policy *policy) |
| 584 | { |
| 585 | char min[SYSFS_PATH_MAX]; |
| 586 | char max[SYSFS_PATH_MAX]; |
| 587 | char gov[SYSFS_PATH_MAX]; |
| 588 | int ret; |
| 589 | unsigned long old_min; |
| 590 | int write_max_first; |
| 591 | |
| 592 | if (!policy || !(policy->governor)) |
| 593 | return -EINVAL; |
| 594 | |
| 595 | if (policy->max < policy->min) |
| 596 | return -EINVAL; |
| 597 | |
| 598 | if (verify_gov(gov, policy->governor)) |
| 599 | return -EINVAL; |
| 600 | |
| 601 | snprintf(min, SYSFS_PATH_MAX, "%lu", policy->min); |
| 602 | snprintf(max, SYSFS_PATH_MAX, "%lu", policy->max); |
| 603 | |
| 604 | old_min = sysfs_cpufreq_get_one_value(cpu, SCALING_MIN_FREQ); |
| 605 | write_max_first = (old_min && (policy->max < old_min) ? 0 : 1); |
| 606 | |
| 607 | if (write_max_first) { |
| 608 | ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MAX_FREQ, |
| 609 | max, strlen(max)); |
| 610 | if (ret) |
| 611 | return ret; |
| 612 | } |
| 613 | |
| 614 | ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MIN_FREQ, min, |
| 615 | strlen(min)); |
| 616 | if (ret) |
| 617 | return ret; |
| 618 | |
| 619 | if (!write_max_first) { |
| 620 | ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MAX_FREQ, |
| 621 | max, strlen(max)); |
| 622 | if (ret) |
| 623 | return ret; |
| 624 | } |
| 625 | |
| 626 | return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_GOVERNOR, |
| 627 | gov, strlen(gov)); |
| 628 | } |
| 629 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 630 | int sysfs_set_frequency(unsigned int cpu, unsigned long target_frequency) |
| 631 | { |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 632 | struct cpufreq_policy *pol = sysfs_get_freq_policy(cpu); |
| 633 | char userspace_gov[] = "userspace"; |
| 634 | char freq[SYSFS_PATH_MAX]; |
| 635 | int ret; |
| 636 | |
| 637 | if (!pol) |
| 638 | return -ENODEV; |
| 639 | |
| 640 | if (strncmp(pol->governor, userspace_gov, 9) != 0) { |
| 641 | ret = sysfs_modify_freq_policy_governor(cpu, userspace_gov); |
| 642 | if (ret) { |
| 643 | cpufreq_put_policy(pol); |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 644 | return ret; |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 645 | } |
| 646 | } |
| 647 | |
| 648 | cpufreq_put_policy(pol); |
| 649 | |
| 650 | snprintf(freq, SYSFS_PATH_MAX, "%lu", target_frequency); |
| 651 | |
| 652 | return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_SET_SPEED, |
| 653 | freq, strlen(freq)); |
| 654 | } |
| 655 | |
| 656 | /* CPUFREQ sysfs access **************************************************/ |
| 657 | |
| 658 | /* General sysfs access **************************************************/ |
| 659 | int sysfs_cpu_exists(unsigned int cpu) |
| 660 | { |
| 661 | char file[SYSFS_PATH_MAX]; |
| 662 | struct stat statbuf; |
| 663 | |
| 664 | snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU "cpu%u/", cpu); |
| 665 | |
Dominik Brodowski | 6c2b818 | 2011-04-19 19:42:33 +0200 | [diff] [blame] | 666 | if (stat(file, &statbuf) != 0) |
Dominik Brodowski | 7fe2f63 | 2011-03-30 16:30:11 +0200 | [diff] [blame] | 667 | return -ENOSYS; |
| 668 | |
| 669 | return S_ISDIR(statbuf.st_mode) ? 0 : -ENOSYS; |
| 670 | } |
| 671 | |
| 672 | /* General sysfs access **************************************************/ |