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