2 * sysfs.c - sysfs support
4 * (C) 2006-2007 Shaohua Li <shaohua.li@intel.com>
6 * This code is licenced under the GPL.
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>
21 static unsigned int sysfs_switch;
22 static int __init cpuidle_sysfs_setup(char *unused)
27 __setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup);
29 static ssize_t show_available_governors(struct device *dev,
30 struct device_attribute *attr,
34 struct cpuidle_governor *tmp;
36 mutex_lock(&cpuidle_lock);
37 list_for_each_entry(tmp, &cpuidle_governors, governor_list) {
38 if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) -
39 CPUIDLE_NAME_LEN - 2))
41 i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name);
45 i+= sprintf(&buf[i], "\n");
46 mutex_unlock(&cpuidle_lock);
50 static ssize_t show_current_driver(struct device *dev,
51 struct device_attribute *attr,
55 struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
57 spin_lock(&cpuidle_driver_lock);
59 ret = sprintf(buf, "%s\n", cpuidle_driver->name);
61 ret = sprintf(buf, "none\n");
62 spin_unlock(&cpuidle_driver_lock);
67 static ssize_t show_current_governor(struct device *dev,
68 struct device_attribute *attr,
73 mutex_lock(&cpuidle_lock);
74 if (cpuidle_curr_governor)
75 ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name);
77 ret = sprintf(buf, "none\n");
78 mutex_unlock(&cpuidle_lock);
83 static ssize_t store_current_governor(struct device *dev,
84 struct device_attribute *attr,
85 const char *buf, size_t count)
87 char gov_name[CPUIDLE_NAME_LEN];
90 struct cpuidle_governor *gov;
92 if (!len || len >= sizeof(gov_name))
95 memcpy(gov_name, buf, len);
97 if (gov_name[len - 1] == '\n')
98 gov_name[--len] = '\0';
100 mutex_lock(&cpuidle_lock);
102 list_for_each_entry(gov, &cpuidle_governors, governor_list) {
103 if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) {
104 ret = cpuidle_switch_governor(gov);
109 mutex_unlock(&cpuidle_lock);
117 static DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL);
118 static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL);
120 static struct attribute *cpuidle_default_attrs[] = {
121 &dev_attr_current_driver.attr,
122 &dev_attr_current_governor_ro.attr,
126 static DEVICE_ATTR(available_governors, 0444, show_available_governors, NULL);
127 static DEVICE_ATTR(current_governor, 0644, show_current_governor,
128 store_current_governor);
130 static struct attribute *cpuidle_switch_attrs[] = {
131 &dev_attr_available_governors.attr,
132 &dev_attr_current_driver.attr,
133 &dev_attr_current_governor.attr,
137 static struct attribute_group cpuidle_attr_group = {
138 .attrs = cpuidle_default_attrs,
143 * cpuidle_add_interface - add CPU global sysfs attributes
145 int cpuidle_add_interface(struct device *dev)
148 cpuidle_attr_group.attrs = cpuidle_switch_attrs;
150 return sysfs_create_group(&dev->kobj, &cpuidle_attr_group);
154 * cpuidle_remove_interface - remove CPU global sysfs attributes
156 void cpuidle_remove_interface(struct device *dev)
158 sysfs_remove_group(&dev->kobj, &cpuidle_attr_group);
161 struct cpuidle_attr {
162 struct attribute attr;
163 ssize_t (*show)(struct cpuidle_device *, char *);
164 ssize_t (*store)(struct cpuidle_device *, const char *, size_t count);
167 #define define_one_ro(_name, show) \
168 static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
169 #define define_one_rw(_name, show, store) \
170 static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store)
172 #define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
174 struct cpuidle_device_kobj {
175 struct cpuidle_device *dev;
176 struct completion kobj_unregister;
180 static inline struct cpuidle_device *to_cpuidle_device(struct kobject *kobj)
182 struct cpuidle_device_kobj *kdev =
183 container_of(kobj, struct cpuidle_device_kobj, kobj);
188 static ssize_t cpuidle_show(struct kobject *kobj, struct attribute *attr,
192 struct cpuidle_device *dev = to_cpuidle_device(kobj);
193 struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr);
196 mutex_lock(&cpuidle_lock);
197 ret = cattr->show(dev, buf);
198 mutex_unlock(&cpuidle_lock);
203 static ssize_t cpuidle_store(struct kobject *kobj, struct attribute *attr,
204 const char *buf, size_t count)
207 struct cpuidle_device *dev = to_cpuidle_device(kobj);
208 struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr);
211 mutex_lock(&cpuidle_lock);
212 ret = cattr->store(dev, buf, count);
213 mutex_unlock(&cpuidle_lock);
218 static const struct sysfs_ops cpuidle_sysfs_ops = {
219 .show = cpuidle_show,
220 .store = cpuidle_store,
223 static void cpuidle_sysfs_release(struct kobject *kobj)
225 struct cpuidle_device_kobj *kdev =
226 container_of(kobj, struct cpuidle_device_kobj, kobj);
228 complete(&kdev->kobj_unregister);
231 static struct kobj_type ktype_cpuidle = {
232 .sysfs_ops = &cpuidle_sysfs_ops,
233 .release = cpuidle_sysfs_release,
236 struct cpuidle_state_attr {
237 struct attribute attr;
238 ssize_t (*show)(struct cpuidle_state *, \
239 struct cpuidle_state_usage *, char *);
240 ssize_t (*store)(struct cpuidle_state *, \
241 struct cpuidle_state_usage *, const char *, size_t);
244 #define define_one_state_ro(_name, show) \
245 static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
247 #define define_one_state_rw(_name, show, store) \
248 static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store)
250 #define define_show_state_function(_name) \
251 static ssize_t show_state_##_name(struct cpuidle_state *state, \
252 struct cpuidle_state_usage *state_usage, char *buf) \
254 return sprintf(buf, "%u\n", state->_name);\
257 #define define_store_state_ull_function(_name) \
258 static ssize_t store_state_##_name(struct cpuidle_state *state, \
259 struct cpuidle_state_usage *state_usage, \
260 const char *buf, size_t size) \
262 unsigned long long value; \
264 if (!capable(CAP_SYS_ADMIN)) \
266 err = kstrtoull(buf, 0, &value); \
270 state_usage->_name = 1; \
272 state_usage->_name = 0; \
276 #define define_show_state_ull_function(_name) \
277 static ssize_t show_state_##_name(struct cpuidle_state *state, \
278 struct cpuidle_state_usage *state_usage, \
281 return sprintf(buf, "%llu\n", state_usage->_name);\
284 #define define_show_state_str_function(_name) \
285 static ssize_t show_state_##_name(struct cpuidle_state *state, \
286 struct cpuidle_state_usage *state_usage, \
289 if (state->_name[0] == '\0')\
290 return sprintf(buf, "<null>\n");\
291 return sprintf(buf, "%s\n", state->_name);\
294 define_show_state_function(exit_latency)
295 define_show_state_function(power_usage)
296 define_show_state_ull_function(usage)
297 define_show_state_ull_function(time)
298 define_show_state_str_function(name)
299 define_show_state_str_function(desc)
300 define_show_state_ull_function(disable)
301 define_store_state_ull_function(disable)
303 define_one_state_ro(name, show_state_name);
304 define_one_state_ro(desc, show_state_desc);
305 define_one_state_ro(latency, show_state_exit_latency);
306 define_one_state_ro(power, show_state_power_usage);
307 define_one_state_ro(usage, show_state_usage);
308 define_one_state_ro(time, show_state_time);
309 define_one_state_rw(disable, show_state_disable, store_state_disable);
311 static struct attribute *cpuidle_state_default_attrs[] = {
322 struct cpuidle_state_kobj {
323 struct cpuidle_state *state;
324 struct cpuidle_state_usage *state_usage;
325 struct completion kobj_unregister;
329 #define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
330 #define kobj_to_state(k) (kobj_to_state_obj(k)->state)
331 #define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage)
332 #define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
334 static ssize_t cpuidle_state_show(struct kobject *kobj, struct attribute *attr,
338 struct cpuidle_state *state = kobj_to_state(kobj);
339 struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
340 struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);
343 ret = cattr->show(state, state_usage, buf);
348 static ssize_t cpuidle_state_store(struct kobject *kobj, struct attribute *attr,
349 const char *buf, size_t size)
352 struct cpuidle_state *state = kobj_to_state(kobj);
353 struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
354 struct cpuidle_state_attr *cattr = attr_to_stateattr(attr);
357 ret = cattr->store(state, state_usage, buf, size);
362 static const struct sysfs_ops cpuidle_state_sysfs_ops = {
363 .show = cpuidle_state_show,
364 .store = cpuidle_state_store,
367 static void cpuidle_state_sysfs_release(struct kobject *kobj)
369 struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
371 complete(&state_obj->kobj_unregister);
374 static struct kobj_type ktype_state_cpuidle = {
375 .sysfs_ops = &cpuidle_state_sysfs_ops,
376 .default_attrs = cpuidle_state_default_attrs,
377 .release = cpuidle_state_sysfs_release,
380 static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
382 kobject_put(&device->kobjs[i]->kobj);
383 wait_for_completion(&device->kobjs[i]->kobj_unregister);
384 kfree(device->kobjs[i]);
385 device->kobjs[i] = NULL;
389 * cpuidle_add_state_sysfs - adds cpuidle states sysfs attributes
390 * @device: the target device
392 static int cpuidle_add_state_sysfs(struct cpuidle_device *device)
394 int i, ret = -ENOMEM;
395 struct cpuidle_state_kobj *kobj;
396 struct cpuidle_device_kobj *kdev = device->kobj_dev;
397 struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
399 /* state statistics */
400 for (i = 0; i < device->state_count; i++) {
401 kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
404 kobj->state = &drv->states[i];
405 kobj->state_usage = &device->states_usage[i];
406 init_completion(&kobj->kobj_unregister);
408 ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle,
409 &kdev->kobj, "state%d", i);
414 kobject_uevent(&kobj->kobj, KOBJ_ADD);
415 device->kobjs[i] = kobj;
421 for (i = i - 1; i >= 0; i--)
422 cpuidle_free_state_kobj(device, i);
427 * cpuidle_remove_driver_sysfs - removes the cpuidle states sysfs attributes
428 * @device: the target device
430 static void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
434 for (i = 0; i < device->state_count; i++)
435 cpuidle_free_state_kobj(device, i);
438 #ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
439 #define kobj_to_driver_kobj(k) container_of(k, struct cpuidle_driver_kobj, kobj)
440 #define attr_to_driver_attr(a) container_of(a, struct cpuidle_driver_attr, attr)
442 #define define_one_driver_ro(_name, show) \
443 static struct cpuidle_driver_attr attr_driver_##_name = \
444 __ATTR(_name, 0644, show, NULL)
446 struct cpuidle_driver_kobj {
447 struct cpuidle_driver *drv;
448 struct completion kobj_unregister;
452 struct cpuidle_driver_attr {
453 struct attribute attr;
454 ssize_t (*show)(struct cpuidle_driver *, char *);
455 ssize_t (*store)(struct cpuidle_driver *, const char *, size_t);
458 static ssize_t show_driver_name(struct cpuidle_driver *drv, char *buf)
462 spin_lock(&cpuidle_driver_lock);
463 ret = sprintf(buf, "%s\n", drv ? drv->name : "none");
464 spin_unlock(&cpuidle_driver_lock);
469 static void cpuidle_driver_sysfs_release(struct kobject *kobj)
471 struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
472 complete(&driver_kobj->kobj_unregister);
475 static ssize_t cpuidle_driver_show(struct kobject *kobj, struct attribute *attr,
479 struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
480 struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
483 ret = dattr->show(driver_kobj->drv, buf);
488 static ssize_t cpuidle_driver_store(struct kobject *kobj, struct attribute *attr,
489 const char *buf, size_t size)
492 struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
493 struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
496 ret = dattr->store(driver_kobj->drv, buf, size);
501 define_one_driver_ro(name, show_driver_name);
503 static const struct sysfs_ops cpuidle_driver_sysfs_ops = {
504 .show = cpuidle_driver_show,
505 .store = cpuidle_driver_store,
508 static struct attribute *cpuidle_driver_default_attrs[] = {
509 &attr_driver_name.attr,
513 static struct kobj_type ktype_driver_cpuidle = {
514 .sysfs_ops = &cpuidle_driver_sysfs_ops,
515 .default_attrs = cpuidle_driver_default_attrs,
516 .release = cpuidle_driver_sysfs_release,
520 * cpuidle_add_driver_sysfs - adds the driver name sysfs attribute
521 * @device: the target device
523 static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
525 struct cpuidle_driver_kobj *kdrv;
526 struct cpuidle_device_kobj *kdev = dev->kobj_dev;
527 struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
530 kdrv = kzalloc(sizeof(*kdrv), GFP_KERNEL);
535 init_completion(&kdrv->kobj_unregister);
537 ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle,
538 &kdev->kobj, "driver");
544 kobject_uevent(&kdrv->kobj, KOBJ_ADD);
545 dev->kobj_driver = kdrv;
551 * cpuidle_remove_driver_sysfs - removes the driver name sysfs attribute
552 * @device: the target device
554 static void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
556 struct cpuidle_driver_kobj *kdrv = dev->kobj_driver;
557 kobject_put(&kdrv->kobj);
558 wait_for_completion(&kdrv->kobj_unregister);
562 static inline int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
567 static inline void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
574 * cpuidle_add_device_sysfs - adds device specific sysfs attributes
575 * @device: the target device
577 int cpuidle_add_device_sysfs(struct cpuidle_device *device)
581 ret = cpuidle_add_state_sysfs(device);
585 ret = cpuidle_add_driver_sysfs(device);
587 cpuidle_remove_state_sysfs(device);
592 * cpuidle_remove_device_sysfs : removes device specific sysfs attributes
593 * @device : the target device
595 void cpuidle_remove_device_sysfs(struct cpuidle_device *device)
597 cpuidle_remove_driver_sysfs(device);
598 cpuidle_remove_state_sysfs(device);
602 * cpuidle_add_sysfs - creates a sysfs instance for the target device
603 * @dev: the target device
605 int cpuidle_add_sysfs(struct cpuidle_device *dev)
607 struct cpuidle_device_kobj *kdev;
608 struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);
611 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
615 dev->kobj_dev = kdev;
617 init_completion(&kdev->kobj_unregister);
619 error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
626 kobject_uevent(&kdev->kobj, KOBJ_ADD);
632 * cpuidle_remove_sysfs - deletes a sysfs instance on the target device
633 * @dev: the target device
635 void cpuidle_remove_sysfs(struct cpuidle_device *dev)
637 struct cpuidle_device_kobj *kdev = dev->kobj_dev;
639 kobject_put(&kdev->kobj);
640 wait_for_completion(&kdev->kobj_unregister);