| 1 | |
| 2 | * sysfs.c - sysfs support
|
| 3 | *
|
| 4 | * (C) 2006-2007 Shaohua Li <[email protected]>
|
| 5 | *
|
| 6 | * This code is licenced under the GPL.
|
| 7 |
|
| 8 |
|
| 9 | #include <linux/kernel.h>
|
| 10 | #include <linux/cpuidle.h>
|
| 11 | #include <linux/sysfs.h>
|
| 12 | #include <linux/slab.h>
|
| 13 | #include <linux/cpu.h>
|
| 14 | #include <linux/completion.h>
|
| 15 | #include <linux/capability.h>
|
| 16 | #include <linux/device.h>
|
| 17 | #include <linux/kobject.h>
|
| 18 |
|
| 19 | #include "cpuidle.h"
|
| 20 |
|
| 21 | static ssize_t show_available_governors(struct device *dev,
|
| 22 | struct device_attribute *attr,
|
| 23 | char *buf)
|
| 24 | {
|
| 25 | ssize_t i = 0;
|
| 26 | struct cpuidle_governor *tmp;
|
| 27 |
|
| 28 | mutex_lock(&cpuidle_lock);
|
| 29 | list_for_each_entry(tmp, &cpuidle_governors, governor_list) {
|
| 30 | if (i >= (ssize_t)(PAGE_SIZE - (CPUIDLE_NAME_LEN + 2)))
|
| 31 | goto out;
|
| 32 |
|
| 33 | i += sysfs_emit_at(buf, i, "%.*s ", CPUIDLE_NAME_LEN, tmp->name);
|
| 34 | }
|
| 35 |
|
| 36 | out:
|
| 37 | i += sysfs_emit_at(buf, i, "\n");
|
| 38 | mutex_unlock(&cpuidle_lock);
|
| 39 | return i;
|
| 40 | }
|
| 41 |
|
| 42 | static ssize_t show_current_driver(struct device *dev,
|
| 43 | struct device_attribute *attr,
|
| 44 | char *buf)
|
| 45 | {
|
| 46 | ssize_t ret;
|
| 47 | struct cpuidle_driver *drv;
|
| 48 |
|
| 49 | spin_lock(&cpuidle_driver_lock);
|
| 50 | drv = cpuidle_get_driver();
|
| 51 | if (drv)
|
| 52 | ret = sysfs_emit(buf, "%s\n", drv->name);
|
| 53 | else
|
| 54 | ret = sysfs_emit(buf, "none\n");
|
| 55 | spin_unlock(&cpuidle_driver_lock);
|
| 56 |
|
| 57 | return ret;
|
| 58 | }
|
| 59 |
|
| 60 | static ssize_t show_current_governor(struct device *dev,
|
| 61 | struct device_attribute *attr,
|
| 62 | char *buf)
|
| 63 | {
|
| 64 | ssize_t ret;
|
| 65 |
|
| 66 | mutex_lock(&cpuidle_lock);
|
| 67 | if (cpuidle_curr_governor)
|
| 68 | ret = sysfs_emit(buf, "%s\n", cpuidle_curr_governor->name);
|
| 69 | else
|
| 70 | ret = sysfs_emit(buf, "none\n");
|
| 71 | mutex_unlock(&cpuidle_lock);
|
| 72 |
|
| 73 | return ret;
|
| 74 | }
|
| 75 |
|
| 76 | static ssize_t store_current_governor(struct device *dev,
|
| 77 | struct device_attribute *attr,
|
| 78 | const char *buf, size_t count)
|
| 79 | {
|
| 80 | char gov_name[CPUIDLE_NAME_LEN + 1];
|
| 81 | int ret;
|
| 82 | struct cpuidle_governor *gov;
|
| 83 |
|
| 84 | ret = sscanf(buf, "%" __stringify(CPUIDLE_NAME_LEN) "s", gov_name);
|
| 85 | if (ret != 1)
|
| 86 | return -EINVAL;
|
| 87 |
|
| 88 | mutex_lock(&cpuidle_lock);
|
| 89 | ret = -EINVAL;
|
| 90 | list_for_each_entry(gov, &cpuidle_governors, governor_list) {
|
| 91 | if (!strncmp(gov->name, gov_name, CPUIDLE_NAME_LEN)) {
|
| 92 | ret = cpuidle_switch_governor(gov);
|
| 93 | break;
|
| 94 | }
|
| 95 | }
|
| 96 | mutex_unlock(&cpuidle_lock);
|
| 97 |
|
| 98 | return ret ? ret : count;
|
| 99 | }
|
| 100 |
|
| 101 | static DEVICE_ATTR(available_governors, 0444, show_available_governors, NULL);
|
| 102 | static DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL);
|
| 103 | static DEVICE_ATTR(current_governor, 0644, show_current_governor,
|
| 104 | store_current_governor);
|
| 105 | static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL);
|
| 106 |
|
| 107 | static struct attribute *cpuidle_attrs[] = {
|
| 108 | &dev_attr_available_governors.attr,
|
| 109 | &dev_attr_current_driver.attr,
|
| 110 | &dev_attr_current_governor.attr,
|
| 111 | &dev_attr_current_governor_ro.attr,
|
| 112 | NULL
|
| 113 | };
|
| 114 |
|
| 115 | static struct attribute_group cpuidle_attr_group = {
|
| 116 | .attrs = cpuidle_attrs,
|
| 117 | .name = "cpuidle",
|
| 118 | };
|
| 119 |
|
| 120 | |
| 121 | * cpuidle_add_interface - add CPU global sysfs attributes
|
| 122 |
|
| 123 | int cpuidle_add_interface(void)
|
| 124 | {
|
| 125 | struct device *dev_root = bus_get_dev_root(&cpu_subsys);
|
| 126 | int retval;
|
| 127 |
|
| 128 | if (!dev_root)
|
| 129 | return -EINVAL;
|
| 130 |
|
| 131 | retval = sysfs_create_group(&dev_root->kobj, &cpuidle_attr_group);
|
| 132 | put_device(dev_root);
|
| 133 | return retval;
|
| 134 | }
|
| 135 |
|
| 136 | |
| 137 | * cpuidle_remove_interface - remove CPU global sysfs attributes
|
| 138 | * @dev: the target device
|
| 139 |
|
| 140 | void cpuidle_remove_interface(struct device *dev)
|
| 141 | {
|
| 142 | sysfs_remove_group(&dev->kobj, &cpuidle_attr_group);
|
| 143 | }
|
| 144 |
|
| 145 | struct cpuidle_attr {
|
| 146 | struct attribute attr;
|
| 147 | ssize_t (*show)(struct cpuidle_device *, char *);
|
| 148 | ssize_t (*store)(struct cpuidle_device *, const char *, size_t count);
|
| 149 | };
|
| 150 |
|
| 151 | #define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
|
| 152 |
|
| 153 | struct cpuidle_device_kobj {
|
| 154 | struct cpuidle_device *dev;
|
| 155 | struct completion kobj_unregister;
|
| 156 | struct kobject kobj;
|
| 157 | };
|
| 158 |
|
| 159 | static inline struct cpuidle_device *to_cpuidle_device(struct kobject *kobj)
|
| 160 | {
|
| 161 | struct cpuidle_device_kobj *kdev =
|
| 162 | container_of(kobj, struct cpuidle_device_kobj, kobj);
|
| 163 |
|
| 164 | return kdev->dev;
|
| 165 | }
|
| 166 |
|
| 167 | static ssize_t cpuidle_show(struct kobject *kobj, struct attribute *attr,
|
| 168 | char *buf)
|
| 169 | {
|
| 170 | int ret = -EIO;
|
| 171 | struct cpuidle_device *dev = to_cpuidle_device(kobj);
|
| 172 | struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr);
|
| 173 |
|
| 174 | if (cattr->show) {
|
| 175 | mutex_lock(&cpuidle_lock);
|
| 176 | ret = cattr->show(dev, buf);
|
| 177 | mutex_unlock(&cpuidle_lock);
|
| 178 | }
|
| 179 | return ret;
|
| 180 | }
|
| 181 |
|
| 182 | static ssize_t cpuidle_store(struct kobject *kobj, struct attribute *attr,
|
| 183 | const char *buf, size_t count)
|
| 184 | {
|
| 185 | int ret = -EIO;
|
| 186 | struct cpuidle_device *dev = to_cpuidle_device(kobj);
|
| 187 | struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr);
|
| 188 |
|
| 189 | if (cattr->store) {
|
| 190 | mutex_lock(&cpuidle_lock);
|
| 191 | ret = cattr->store(dev, buf, count);
|
| 192 | mutex_unlock(&cpuidle_lock);
|
| 193 | }
|
| 194 | return ret;
|
| 195 | }
|
| 196 |
|
| 197 | static const struct sysfs_ops cpuidle_sysfs_ops = {
|
| 198 | .show = cpuidle_show,
|
| 199 | .store = cpuidle_store,
|
| 200 | };
|
| 201 |
|
| 202 | static void cpuidle_sysfs_release(struct kobject *kobj)
|
| 203 | {
|
| 204 | struct cpuidle_device_kobj *kdev =
|
| 205 | container_of(kobj, struct cpuidle_device_kobj, kobj);
|
| 206 |
|
| 207 | complete(&kdev->kobj_unregister);
|
| 208 | }
|
| 209 |
|
| 210 | static const struct kobj_type ktype_cpuidle = {
|
| 211 | .sysfs_ops = &cpuidle_sysfs_ops,
|
| 212 | .release = cpuidle_sysfs_release,
|
| 213 | };
|
| 214 |
|
| 215 | struct cpuidle_state_attr {
|
| 216 | struct attribute attr;
|
| 217 | ssize_t (*show)(struct cpuidle_state *, \
|
| 218 | struct cpuidle_state_usage *, char *);
|
| 219 | ssize_t (*store)(struct cpuidle_state *, \
|
| 220 | struct cpuidle_state_usage *, const char *, size_t);
|
| 221 | };
|
| 222 |
|
| 223 | #define define_one_state_ro(_name, show) \
|
| 224 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
|
| 225 |
|
| 226 | #define define_one_state_rw(_name, show, store) \
|
| 227 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store)
|
| 228 |
|
| 229 | #define define_show_state_function(_name) \
|
| 230 | static ssize_t show_state_##_name(struct cpuidle_state *state, \
|
| 231 | struct cpuidle_state_usage *state_usage, char *buf) \
|
| 232 | { \
|
| 233 | return sysfs_emit(buf, "%u\n", state->_name);\
|
| 234 | }
|
| 235 |
|
| 236 | #define define_show_state_ull_function(_name) \
|
| 237 | static ssize_t show_state_##_name(struct cpuidle_state *state, \
|
| 238 | struct cpuidle_state_usage *state_usage, \
|
| 239 | char *buf) \
|
| 240 | { \
|
| 241 | return sysfs_emit(buf, "%llu\n", state_usage->_name);\
|
| 242 | }
|
| 243 |
|
| 244 | #define define_show_state_str_function(_name) \
|
| 245 | static ssize_t show_state_##_name(struct cpuidle_state *state, \
|
| 246 | struct cpuidle_state_usage *state_usage, \
|
| 247 | char *buf) \
|
| 248 | { \
|
| 249 | if (state->_name[0] == '\0')\
|
| 250 | return sysfs_emit(buf, "<null>\n");\
|
| 251 | return sysfs_emit(buf, "%s\n", state->_name);\
|
| 252 | }
|
| 253 |
|
| 254 | #define define_show_state_time_function(_name) \
|
| 255 | static ssize_t show_state_##_name(struct cpuidle_state *state, \
|
| 256 | struct cpuidle_state_usage *state_usage, \
|
| 257 | char *buf) \
|
| 258 | { \
|
| 259 | return sysfs_emit(buf, "%llu\n", ktime_to_us(state->_name##_ns)); \
|
| 260 | }
|
| 261 |
|
| 262 | define_show_state_time_function(exit_latency)
|
| 263 | define_show_state_time_function(target_residency)
|
| 264 | define_show_state_function(power_usage)
|
| 265 | define_show_state_ull_function(usage)
|
| 266 | define_show_state_ull_function(rejected)
|
| 267 | define_show_state_str_function(name)
|
| 268 | define_show_state_str_function(desc)
|
| 269 | define_show_state_ull_function(above)
|
| 270 | define_show_state_ull_function(below)
|
| 271 |
|
| 272 | static ssize_t show_state_time(struct cpuidle_state *state,
|
| 273 | struct cpuidle_state_usage *state_usage,
|
| 274 | char *buf)
|
| 275 | {
|
| 276 | return sysfs_emit(buf, "%llu\n", ktime_to_us(state_usage->time_ns));
|
| 277 | }
|
| 278 |
|
| 279 | static ssize_t show_state_disable(struct cpuidle_state *state,
|
| 280 | struct cpuidle_state_usage *state_usage,
|
| 281 | char *buf)
|
| 282 | {
|
| 283 | return sysfs_emit(buf, "%llu\n",
|
| 284 | state_usage->disable & CPUIDLE_STATE_DISABLED_BY_USER);
|
| 285 | }
|
| 286 |
|
| 287 | static ssize_t store_state_disable(struct cpuidle_state *state,
|
| 288 | struct cpuidle_state_usage *state_usage,
|
| 289 | const char *buf, size_t size)
|
| 290 | {
|
| 291 | unsigned int value;
|
| 292 | int err;
|
| 293 |
|
| 294 | if (!capable(CAP_SYS_ADMIN))
|
| 295 | return -EPERM;
|
| 296 |
|
| 297 | err = kstrtouint(buf, 0, &value);
|
| 298 | if (err)
|
| 299 | return err;
|
| 300 |
|
| 301 | if (value)
|
| 302 | state_usage->disable |= CPUIDLE_STATE_DISABLED_BY_USER;
|
| 303 | else
|
| 304 | state_usage->disable &= ~CPUIDLE_STATE_DISABLED_BY_USER;
|
| 305 |
|
| 306 | return size;
|
| 307 | }
|
| 308 |
|
| 309 | static ssize_t show_state_default_status(struct cpuidle_state *state,
|
| 310 | struct cpuidle_state_usage *state_usage,
|
| 311 | char *buf)
|
| 312 | {
|
| 313 | return sysfs_emit(buf, "%s\n",
|
| 314 | state->flags & CPUIDLE_FLAG_OFF ? "disabled" : "enabled");
|
| 315 | }
|
| 316 |
|
| 317 | define_one_state_ro(name, show_state_name);
|
| 318 | define_one_state_ro(desc, show_state_desc);
|
| 319 | define_one_state_ro(latency, show_state_exit_latency);
|
| 320 | define_one_state_ro(residency, show_state_target_residency);
|
| 321 | define_one_state_ro(power, show_state_power_usage);
|
| 322 | define_one_state_ro(usage, show_state_usage);
|
| 323 | define_one_state_ro(rejected, show_state_rejected);
|
| 324 | define_one_state_ro(time, show_state_time);
|
| 325 | define_one_state_rw(disable, show_state_disable, store_state_disable);
|
| 326 | define_one_state_ro(above, show_state_above);
|
| 327 | define_one_state_ro(below, show_state_below);
|
| 328 | define_one_state_ro(default_status, show_state_default_status);
|
| 329 |
|
| 330 | static struct attribute *cpuidle_state_default_attrs[] = {
|
| 331 | &attr_name.attr,
|
| 332 | &attr_desc.attr,
|
| 333 | &attr_latency.attr,
|
| 334 | &attr_residency.attr,
|
| 335 | &attr_power.attr,
|
| 336 | &attr_usage.attr,
|
| 337 | &attr_rejected.attr,
|
| 338 | &attr_time.attr,
|
| 339 | &attr_disable.attr,
|
| 340 | &attr_above.attr,
|
| 341 | &attr_below.attr,
|
| 342 | &attr_default_status.attr,
|
| 343 | NULL
|
| 344 | };
|
| 345 | ATTRIBUTE_GROUPS(cpuidle_state_default);
|
| 346 |
|
| 347 | struct cpuidle_state_kobj {
|
| 348 | struct cpuidle_state *state;
|
| 349 | struct cpuidle_state_usage *state_usage;
|
| 350 | struct completion kobj_unregister;
|
| 351 | struct kobject kobj;
|
| 352 | struct cpuidle_device *device;
|
| 353 | };
|
| 354 |
|
| 355 | #ifdef CONFIG_SUSPEND
|
| 356 | #define define_show_state_s2idle_ull_function(_name) \
|
| 357 | static ssize_t show_state_s2idle_##_name(struct cpuidle_state *state, \
|
| 358 | struct cpuidle_state_usage *state_usage, \
|
| 359 | char *buf) \
|
| 360 | { \
|
| 361 | return sysfs_emit(buf, "%llu\n", state_usage->s2idle_##_name);\
|
| 362 | }
|
| 363 |
|
| 364 | define_show_state_s2idle_ull_function(usage);
|
| 365 | define_show_state_s2idle_ull_function(time);
|
| 366 |
|
| 367 | #define define_one_state_s2idle_ro(_name, show) \
|
| 368 | static struct cpuidle_state_attr attr_s2idle_##_name = \
|
| 369 | __ATTR(_name, 0444, show, NULL)
|
| 370 |
|
| 371 | define_one_state_s2idle_ro(usage, show_state_s2idle_usage);
|
| 372 | define_one_state_s2idle_ro(time, show_state_s2idle_time);
|
| 373 |
|
| 374 | static struct attribute *cpuidle_state_s2idle_attrs[] = {
|
| 375 | &attr_s2idle_usage.attr,
|
| 376 | &attr_s2idle_time.attr,
|
| 377 | NULL
|
| 378 | };
|
| 379 |
|
| 380 | static const struct attribute_group cpuidle_state_s2idle_group = {
|
| 381 | .name = "s2idle",
|
| 382 | .attrs = cpuidle_state_s2idle_attrs,
|
| 383 | };
|
| 384 |
|
| 385 | static void cpuidle_add_s2idle_attr_group(struct cpuidle_state_kobj *kobj)
|
| 386 | {
|
| 387 | int ret;
|
| 388 |
|
| 389 | if (!kobj->state->enter_s2idle)
|
| 390 | return;
|
| 391 |
|
| 392 | ret = sysfs_create_group(&kobj->kobj, &cpuidle_state_s2idle_group);
|
| 393 | if (ret)
|
| 394 | pr_debug("%s: sysfs attribute group not created\n", __func__);
|
| 395 | }
|
| 396 |
|
| 397 | static void cpuidle_remove_s2idle_attr_group(struct cpuidle_state_kobj *kobj)
|
| 398 | {
|
| 399 | if (kobj->state->enter_s2idle)
|
| 400 | sysfs_remove_group(&kobj->kobj, &cpuidle_state_s2idle_group);
|
| 401 | }
|
| 402 | #else
|
| 403 | static inline void cpuidle_add_s2idle_attr_group(struct cpuidle_state_kobj *kobj) { }
|
| 404 | static inline void cpuidle_remove_s2idle_attr_group(struct cpuidle_state_kobj *kobj) { }
|
| 405 | #endif
|
| 406 |
|
| 407 | #define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
|
| 408 | #define kobj_to_state(k) (kobj_to_state_obj(k)->state)
|
| 409 | #define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage)
|
| 410 | #define kobj_to_device(k) (kobj_to_state_obj(k)->device)
|
| 411 | #define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
|
| 412 |
|
| 413 | static ssize_t cpuidle_state_show(struct kobject *kobj, struct attribute *attr,
|
| 414 | char *buf)
|
| 415 | {
|
| 416 | int ret = -EIO;
|
| 417 | struct cpuidle_state *state = kobj_to_state(kobj);
|
| 418 | struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
|
| 419 | struct cpuidle_state_attr *cattr = attr_to_stateattr(attr);
|
| 420 |
|
| 421 | if (cattr->show)
|
| 422 | ret = cattr->show(state, state_usage, buf);
|
| 423 |
|
| 424 | return ret;
|
| 425 | }
|
| 426 |
|
| 427 | static ssize_t cpuidle_state_store(struct kobject *kobj, struct attribute *attr,
|
| 428 | const char *buf, size_t size)
|
| 429 | {
|
| 430 | int ret = -EIO;
|
| 431 | struct cpuidle_state *state = kobj_to_state(kobj);
|
| 432 | struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
|
| 433 | struct cpuidle_state_attr *cattr = attr_to_stateattr(attr);
|
| 434 | struct cpuidle_device *dev = kobj_to_device(kobj);
|
| 435 |
|
| 436 | if (cattr->store)
|
| 437 | ret = cattr->store(state, state_usage, buf, size);
|
| 438 |
|
| 439 |
|
| 440 | dev->poll_limit_ns = 0;
|
| 441 |
|
| 442 | return ret;
|
| 443 | }
|
| 444 |
|
| 445 | static const struct sysfs_ops cpuidle_state_sysfs_ops = {
|
| 446 | .show = cpuidle_state_show,
|
| 447 | .store = cpuidle_state_store,
|
| 448 | };
|
| 449 |
|
| 450 | static void cpuidle_state_sysfs_release(struct kobject *kobj)
|
| 451 | {
|
| 452 | struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
|
| 453 |
|
| 454 | complete(&state_obj->kobj_unregister);
|
| 455 | }
|
| 456 |
|
| 457 | static const struct kobj_type ktype_state_cpuidle = {
|
| 458 | .sysfs_ops = &cpuidle_state_sysfs_ops,
|
| 459 | .default_groups = cpuidle_state_default_groups,
|
| 460 | .release = cpuidle_state_sysfs_release,
|
| 461 | };
|
| 462 |
|
| 463 | static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
|
| 464 | {
|
| 465 | cpuidle_remove_s2idle_attr_group(device->kobjs[i]);
|
| 466 | kobject_put(&device->kobjs[i]->kobj);
|
| 467 | wait_for_completion(&device->kobjs[i]->kobj_unregister);
|
| 468 | kfree(device->kobjs[i]);
|
| 469 | device->kobjs[i] = NULL;
|
| 470 | }
|
| 471 |
|
| 472 | |
| 473 | * cpuidle_add_state_sysfs - adds cpuidle states sysfs attributes
|
| 474 | * @device: the target device
|
| 475 |
|
| 476 | static int cpuidle_add_state_sysfs(struct cpuidle_device *device)
|
| 477 | {
|
| 478 | int i, ret = -ENOMEM;
|
| 479 | struct cpuidle_state_kobj *kobj;
|
| 480 | struct cpuidle_device_kobj *kdev = device->kobj_dev;
|
| 481 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
|
| 482 |
|
| 483 |
|
| 484 | for (i = 0; i < drv->state_count; i++) {
|
| 485 | kobj = kzalloc_obj(struct cpuidle_state_kobj);
|
| 486 | if (!kobj) {
|
| 487 | ret = -ENOMEM;
|
| 488 | goto error_state;
|
| 489 | }
|
| 490 | kobj->state = &drv->states[i];
|
| 491 | kobj->state_usage = &device->states_usage[i];
|
| 492 | kobj->device = device;
|
| 493 | init_completion(&kobj->kobj_unregister);
|
| 494 |
|
| 495 | ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle,
|
| 496 | &kdev->kobj, "state%d", i);
|
| 497 | if (ret) {
|
| 498 | kobject_put(&kobj->kobj);
|
| 499 | kfree(kobj);
|
| 500 | goto error_state;
|
| 501 | }
|
| 502 | cpuidle_add_s2idle_attr_group(kobj);
|
| 503 | kobject_uevent(&kobj->kobj, KOBJ_ADD);
|
| 504 | device->kobjs[i] = kobj;
|
| 505 | }
|
| 506 |
|
| 507 | return 0;
|
| 508 |
|
| 509 | error_state:
|
| 510 | for (i = i - 1; i >= 0; i--)
|
| 511 | cpuidle_free_state_kobj(device, i);
|
| 512 | return ret;
|
| 513 | }
|
| 514 |
|
| 515 | |
| 516 | * cpuidle_remove_state_sysfs - removes the cpuidle states sysfs attributes
|
| 517 | * @device: the target device
|
| 518 |
|
| 519 | static void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
|
| 520 | {
|
| 521 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
|
| 522 | int i;
|
| 523 |
|
| 524 | for (i = 0; i < drv->state_count; i++)
|
| 525 | cpuidle_free_state_kobj(device, i);
|
| 526 | }
|
| 527 |
|
| 528 | #ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
|
| 529 | #define kobj_to_driver_kobj(k) container_of(k, struct cpuidle_driver_kobj, kobj)
|
| 530 | #define attr_to_driver_attr(a) container_of(a, struct cpuidle_driver_attr, attr)
|
| 531 |
|
| 532 | #define define_one_driver_ro(_name, show) \
|
| 533 | static struct cpuidle_driver_attr attr_driver_##_name = \
|
| 534 | __ATTR(_name, 0444, show, NULL)
|
| 535 |
|
| 536 | struct cpuidle_driver_kobj {
|
| 537 | struct cpuidle_driver *drv;
|
| 538 | struct completion kobj_unregister;
|
| 539 | struct kobject kobj;
|
| 540 | };
|
| 541 |
|
| 542 | struct cpuidle_driver_attr {
|
| 543 | struct attribute attr;
|
| 544 | ssize_t (*show)(struct cpuidle_driver *, char *);
|
| 545 | ssize_t (*store)(struct cpuidle_driver *, const char *, size_t);
|
| 546 | };
|
| 547 |
|
| 548 | static ssize_t show_driver_name(struct cpuidle_driver *drv, char *buf)
|
| 549 | {
|
| 550 | ssize_t ret;
|
| 551 |
|
| 552 | spin_lock(&cpuidle_driver_lock);
|
| 553 | ret = sysfs_emit(buf, "%s\n", drv ? drv->name : "none");
|
| 554 | spin_unlock(&cpuidle_driver_lock);
|
| 555 |
|
| 556 | return ret;
|
| 557 | }
|
| 558 |
|
| 559 | static void cpuidle_driver_sysfs_release(struct kobject *kobj)
|
| 560 | {
|
| 561 | struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
|
| 562 | complete(&driver_kobj->kobj_unregister);
|
| 563 | }
|
| 564 |
|
| 565 | static ssize_t cpuidle_driver_show(struct kobject *kobj, struct attribute *attr,
|
| 566 | char *buf)
|
| 567 | {
|
| 568 | int ret = -EIO;
|
| 569 | struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
|
| 570 | struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
|
| 571 |
|
| 572 | if (dattr->show)
|
| 573 | ret = dattr->show(driver_kobj->drv, buf);
|
| 574 |
|
| 575 | return ret;
|
| 576 | }
|
| 577 |
|
| 578 | static ssize_t cpuidle_driver_store(struct kobject *kobj, struct attribute *attr,
|
| 579 | const char *buf, size_t size)
|
| 580 | {
|
| 581 | int ret = -EIO;
|
| 582 | struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
|
| 583 | struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
|
| 584 |
|
| 585 | if (dattr->store)
|
| 586 | ret = dattr->store(driver_kobj->drv, buf, size);
|
| 587 |
|
| 588 | return ret;
|
| 589 | }
|
| 590 |
|
| 591 | define_one_driver_ro(name, show_driver_name);
|
| 592 |
|
| 593 | static const struct sysfs_ops cpuidle_driver_sysfs_ops = {
|
| 594 | .show = cpuidle_driver_show,
|
| 595 | .store = cpuidle_driver_store,
|
| 596 | };
|
| 597 |
|
| 598 | static struct attribute *cpuidle_driver_default_attrs[] = {
|
| 599 | &attr_driver_name.attr,
|
| 600 | NULL
|
| 601 | };
|
| 602 | ATTRIBUTE_GROUPS(cpuidle_driver_default);
|
| 603 |
|
| 604 | static const struct kobj_type ktype_driver_cpuidle = {
|
| 605 | .sysfs_ops = &cpuidle_driver_sysfs_ops,
|
| 606 | .default_groups = cpuidle_driver_default_groups,
|
| 607 | .release = cpuidle_driver_sysfs_release,
|
| 608 | };
|
| 609 |
|
| 610 | |
| 611 | * cpuidle_add_driver_sysfs - adds the driver name sysfs attribute
|
| 612 | * @dev: the target device
|
| 613 |
|
| 614 | static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
|
| 615 | {
|
| 616 | struct cpuidle_driver_kobj *kdrv;
|
| 617 | struct cpuidle_device_kobj *kdev = dev->kobj_dev;
|
| 618 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
|
| 619 | int ret;
|
| 620 |
|
| 621 | kdrv = kzalloc_obj(*kdrv);
|
| 622 | if (!kdrv)
|
| 623 | return -ENOMEM;
|
| 624 |
|
| 625 | kdrv->drv = drv;
|
| 626 | init_completion(&kdrv->kobj_unregister);
|
| 627 |
|
| 628 | ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle,
|
| 629 | &kdev->kobj, "driver");
|
| 630 | if (ret) {
|
| 631 | kobject_put(&kdrv->kobj);
|
| 632 | kfree(kdrv);
|
| 633 | return ret;
|
| 634 | }
|
| 635 |
|
| 636 | kobject_uevent(&kdrv->kobj, KOBJ_ADD);
|
| 637 | dev->kobj_driver = kdrv;
|
| 638 |
|
| 639 | return ret;
|
| 640 | }
|
| 641 |
|
| 642 | |
| 643 | * cpuidle_remove_driver_sysfs - removes the driver name sysfs attribute
|
| 644 | * @dev: the target device
|
| 645 |
|
| 646 | static void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
|
| 647 | {
|
| 648 | struct cpuidle_driver_kobj *kdrv = dev->kobj_driver;
|
| 649 | kobject_put(&kdrv->kobj);
|
| 650 | wait_for_completion(&kdrv->kobj_unregister);
|
| 651 | kfree(kdrv);
|
| 652 | }
|
| 653 | #else
|
| 654 | static inline int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
|
| 655 | {
|
| 656 | return 0;
|
| 657 | }
|
| 658 |
|
| 659 | static inline void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
|
| 660 | {
|
| 661 | ;
|
| 662 | }
|
| 663 | #endif
|
| 664 |
|
| 665 | |
| 666 | * cpuidle_add_device_sysfs - adds device specific sysfs attributes
|
| 667 | * @device: the target device
|
| 668 |
|
| 669 | int cpuidle_add_device_sysfs(struct cpuidle_device *device)
|
| 670 | {
|
| 671 | int ret;
|
| 672 |
|
| 673 | ret = cpuidle_add_state_sysfs(device);
|
| 674 | if (ret)
|
| 675 | return ret;
|
| 676 |
|
| 677 | ret = cpuidle_add_driver_sysfs(device);
|
| 678 | if (ret)
|
| 679 | cpuidle_remove_state_sysfs(device);
|
| 680 | return ret;
|
| 681 | }
|
| 682 |
|
| 683 | |
| 684 | * cpuidle_remove_device_sysfs : removes device specific sysfs attributes
|
| 685 | * @device : the target device
|
| 686 |
|
| 687 | void cpuidle_remove_device_sysfs(struct cpuidle_device *device)
|
| 688 | {
|
| 689 | cpuidle_remove_driver_sysfs(device);
|
| 690 | cpuidle_remove_state_sysfs(device);
|
| 691 | }
|
| 692 |
|
| 693 | |
| 694 | * cpuidle_add_sysfs - creates a sysfs instance for the target device
|
| 695 | * @dev: the target device
|
| 696 |
|
| 697 | int cpuidle_add_sysfs(struct cpuidle_device *dev)
|
| 698 | {
|
| 699 | struct cpuidle_device_kobj *kdev;
|
| 700 | struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);
|
| 701 | int error;
|
| 702 |
|
| 703 | |
| 704 | * Return if cpu_device is not setup for this CPU.
|
| 705 | *
|
| 706 | * This could happen if the arch did not set up cpu_device
|
| 707 | * since this CPU is not in cpu_present mask and the
|
| 708 | * driver did not send a correct CPU mask during registration.
|
| 709 | * Without this check we would end up passing bogus
|
| 710 | * value for &cpu_dev->kobj in kobject_init_and_add()
|
| 711 |
|
| 712 | if (!cpu_dev)
|
| 713 | return -ENODEV;
|
| 714 |
|
| 715 | kdev = kzalloc_obj(*kdev);
|
| 716 | if (!kdev)
|
| 717 | return -ENOMEM;
|
| 718 | kdev->dev = dev;
|
| 719 |
|
| 720 | init_completion(&kdev->kobj_unregister);
|
| 721 |
|
| 722 | error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
|
| 723 | "cpuidle");
|
| 724 | if (error) {
|
| 725 | kobject_put(&kdev->kobj);
|
| 726 | kfree(kdev);
|
| 727 | return error;
|
| 728 | }
|
| 729 |
|
| 730 | dev->kobj_dev = kdev;
|
| 731 | kobject_uevent(&kdev->kobj, KOBJ_ADD);
|
| 732 |
|
| 733 | return 0;
|
| 734 | }
|
| 735 |
|
| 736 | |
| 737 | * cpuidle_remove_sysfs - deletes a sysfs instance on the target device
|
| 738 | * @dev: the target device
|
| 739 |
|
| 740 | void cpuidle_remove_sysfs(struct cpuidle_device *dev)
|
| 741 | {
|
| 742 | struct cpuidle_device_kobj *kdev = dev->kobj_dev;
|
| 743 |
|
| 744 | kobject_put(&kdev->kobj);
|
| 745 | wait_for_completion(&kdev->kobj_unregister);
|
| 746 | kfree(kdev);
|
| 747 | }
|