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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 < device->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 int i;
437
438 for (i = 0; i < device->state_count; i++)
439 cpuidle_free_state_kobj(device, i);
440}
441
442#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
443#define kobj_to_driver_kobj(k) container_of(k, struct cpuidle_driver_kobj, kobj)
444#define attr_to_driver_attr(a) container_of(a, struct cpuidle_driver_attr, attr)
445
446#define define_one_driver_ro(_name, show) \
447 static struct cpuidle_driver_attr attr_driver_##_name = \
448 __ATTR(_name, 0644, show, NULL)
449
450struct cpuidle_driver_kobj {
451 struct cpuidle_driver *drv;
452 struct completion kobj_unregister;
453 struct kobject kobj;
454};
455
456struct cpuidle_driver_attr {
457 struct attribute attr;
458 ssize_t (*show)(struct cpuidle_driver *, char *);
459 ssize_t (*store)(struct cpuidle_driver *, const char *, size_t);
460};
461
462static ssize_t show_driver_name(struct cpuidle_driver *drv, char *buf)
463{
464 ssize_t ret;
465
466 spin_lock(&cpuidle_driver_lock);
467 ret = sprintf(buf, "%s\n", drv ? drv->name : "none");
468 spin_unlock(&cpuidle_driver_lock);
469
470 return ret;
471}
472
473static void cpuidle_driver_sysfs_release(struct kobject *kobj)
474{
475 struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
476 complete(&driver_kobj->kobj_unregister);
477}
478
479static ssize_t cpuidle_driver_show(struct kobject *kobj, struct attribute *attr,
480 char *buf)
481{
482 int ret = -EIO;
483 struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
484 struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
485
486 if (dattr->show)
487 ret = dattr->show(driver_kobj->drv, buf);
488
489 return ret;
490}
491
492static ssize_t cpuidle_driver_store(struct kobject *kobj, struct attribute *attr,
493 const char *buf, size_t size)
494{
495 int ret = -EIO;
496 struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
497 struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
498
499 if (dattr->store)
500 ret = dattr->store(driver_kobj->drv, buf, size);
501
502 return ret;
503}
504
505define_one_driver_ro(name, show_driver_name);
506
507static const struct sysfs_ops cpuidle_driver_sysfs_ops = {
508 .show = cpuidle_driver_show,
509 .store = cpuidle_driver_store,
510};
511
512static struct attribute *cpuidle_driver_default_attrs[] = {
513 &attr_driver_name.attr,
514 NULL
515};
516
517static struct kobj_type ktype_driver_cpuidle = {
518 .sysfs_ops = &cpuidle_driver_sysfs_ops,
519 .default_attrs = cpuidle_driver_default_attrs,
520 .release = cpuidle_driver_sysfs_release,
521};
522
523/**
524 * cpuidle_add_driver_sysfs - adds the driver name sysfs attribute
525 * @device: the target device
526 */
527static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
528{
529 struct cpuidle_driver_kobj *kdrv;
530 struct cpuidle_device_kobj *kdev = dev->kobj_dev;
531 struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
532 int ret;
533
534 kdrv = kzalloc(sizeof(*kdrv), GFP_KERNEL);
535 if (!kdrv)
536 return -ENOMEM;
537
538 kdrv->drv = drv;
539 init_completion(&kdrv->kobj_unregister);
540
541 ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle,
542 &kdev->kobj, "driver");
543 if (ret) {
544 kfree(kdrv);
545 return ret;
546 }
547
548 kobject_uevent(&kdrv->kobj, KOBJ_ADD);
549 dev->kobj_driver = kdrv;
550
551 return ret;
552}
553
554/**
555 * cpuidle_remove_driver_sysfs - removes the driver name sysfs attribute
556 * @device: the target device
557 */
558static void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
559{
560 struct cpuidle_driver_kobj *kdrv = dev->kobj_driver;
561 kobject_put(&kdrv->kobj);
562 wait_for_completion(&kdrv->kobj_unregister);
563 kfree(kdrv);
564}
565#else
566static inline int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
567{
568 return 0;
569}
570
571static inline void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
572{
573 ;
574}
575#endif
576
577/**
578 * cpuidle_add_device_sysfs - adds device specific sysfs attributes
579 * @device: the target device
580 */
581int cpuidle_add_device_sysfs(struct cpuidle_device *device)
582{
583 int ret;
584
585 ret = cpuidle_add_state_sysfs(device);
586 if (ret)
587 return ret;
588
589 ret = cpuidle_add_driver_sysfs(device);
590 if (ret)
591 cpuidle_remove_state_sysfs(device);
592 return ret;
593}
594
595/**
596 * cpuidle_remove_device_sysfs : removes device specific sysfs attributes
597 * @device : the target device
598 */
599void cpuidle_remove_device_sysfs(struct cpuidle_device *device)
600{
601 cpuidle_remove_driver_sysfs(device);
602 cpuidle_remove_state_sysfs(device);
603}
604
605/**
606 * cpuidle_add_sysfs - creates a sysfs instance for the target device
607 * @dev: the target device
608 */
609int cpuidle_add_sysfs(struct cpuidle_device *dev)
610{
611 struct cpuidle_device_kobj *kdev;
612 struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);
613 int error;
614
615 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
616 if (!kdev)
617 return -ENOMEM;
618 kdev->dev = dev;
619 dev->kobj_dev = kdev;
620
621 init_completion(&kdev->kobj_unregister);
622
623 error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
624 "cpuidle");
625 if (error) {
626 kfree(kdev);
627 return error;
628 }
629
630 kobject_uevent(&kdev->kobj, KOBJ_ADD);
631
632 return 0;
633}
634
635/**
636 * cpuidle_remove_sysfs - deletes a sysfs instance on the target device
637 * @dev: the target device
638 */
639void cpuidle_remove_sysfs(struct cpuidle_device *dev)
640{
641 struct cpuidle_device_kobj *kdev = dev->kobj_dev;
642
643 kobject_put(&kdev->kobj);
644 wait_for_completion(&kdev->kobj_unregister);
645 kfree(kdev);
646}
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_ull_function(rejected)
260define_show_state_str_function(name)
261define_show_state_str_function(desc)
262define_show_state_ull_function(above)
263define_show_state_ull_function(below)
264
265static ssize_t show_state_time(struct cpuidle_state *state,
266 struct cpuidle_state_usage *state_usage,
267 char *buf)
268{
269 return sprintf(buf, "%llu\n", ktime_to_us(state_usage->time_ns));
270}
271
272static ssize_t show_state_disable(struct cpuidle_state *state,
273 struct cpuidle_state_usage *state_usage,
274 char *buf)
275{
276 return sprintf(buf, "%llu\n",
277 state_usage->disable & CPUIDLE_STATE_DISABLED_BY_USER);
278}
279
280static ssize_t store_state_disable(struct cpuidle_state *state,
281 struct cpuidle_state_usage *state_usage,
282 const char *buf, size_t size)
283{
284 unsigned int value;
285 int err;
286
287 if (!capable(CAP_SYS_ADMIN))
288 return -EPERM;
289
290 err = kstrtouint(buf, 0, &value);
291 if (err)
292 return err;
293
294 if (value)
295 state_usage->disable |= CPUIDLE_STATE_DISABLED_BY_USER;
296 else
297 state_usage->disable &= ~CPUIDLE_STATE_DISABLED_BY_USER;
298
299 return size;
300}
301
302static ssize_t show_state_default_status(struct cpuidle_state *state,
303 struct cpuidle_state_usage *state_usage,
304 char *buf)
305{
306 return sprintf(buf, "%s\n",
307 state->flags & CPUIDLE_FLAG_OFF ? "disabled" : "enabled");
308}
309
310define_one_state_ro(name, show_state_name);
311define_one_state_ro(desc, show_state_desc);
312define_one_state_ro(latency, show_state_exit_latency);
313define_one_state_ro(residency, show_state_target_residency);
314define_one_state_ro(power, show_state_power_usage);
315define_one_state_ro(usage, show_state_usage);
316define_one_state_ro(rejected, show_state_rejected);
317define_one_state_ro(time, show_state_time);
318define_one_state_rw(disable, show_state_disable, store_state_disable);
319define_one_state_ro(above, show_state_above);
320define_one_state_ro(below, show_state_below);
321define_one_state_ro(default_status, show_state_default_status);
322
323static struct attribute *cpuidle_state_default_attrs[] = {
324 &attr_name.attr,
325 &attr_desc.attr,
326 &attr_latency.attr,
327 &attr_residency.attr,
328 &attr_power.attr,
329 &attr_usage.attr,
330 &attr_rejected.attr,
331 &attr_time.attr,
332 &attr_disable.attr,
333 &attr_above.attr,
334 &attr_below.attr,
335 &attr_default_status.attr,
336 NULL
337};
338ATTRIBUTE_GROUPS(cpuidle_state_default);
339
340struct cpuidle_state_kobj {
341 struct cpuidle_state *state;
342 struct cpuidle_state_usage *state_usage;
343 struct completion kobj_unregister;
344 struct kobject kobj;
345 struct cpuidle_device *device;
346};
347
348#ifdef CONFIG_SUSPEND
349#define define_show_state_s2idle_ull_function(_name) \
350static ssize_t show_state_s2idle_##_name(struct cpuidle_state *state, \
351 struct cpuidle_state_usage *state_usage, \
352 char *buf) \
353{ \
354 return sprintf(buf, "%llu\n", state_usage->s2idle_##_name);\
355}
356
357define_show_state_s2idle_ull_function(usage);
358define_show_state_s2idle_ull_function(time);
359
360#define define_one_state_s2idle_ro(_name, show) \
361static struct cpuidle_state_attr attr_s2idle_##_name = \
362 __ATTR(_name, 0444, show, NULL)
363
364define_one_state_s2idle_ro(usage, show_state_s2idle_usage);
365define_one_state_s2idle_ro(time, show_state_s2idle_time);
366
367static struct attribute *cpuidle_state_s2idle_attrs[] = {
368 &attr_s2idle_usage.attr,
369 &attr_s2idle_time.attr,
370 NULL
371};
372
373static const struct attribute_group cpuidle_state_s2idle_group = {
374 .name = "s2idle",
375 .attrs = cpuidle_state_s2idle_attrs,
376};
377
378static void cpuidle_add_s2idle_attr_group(struct cpuidle_state_kobj *kobj)
379{
380 int ret;
381
382 if (!kobj->state->enter_s2idle)
383 return;
384
385 ret = sysfs_create_group(&kobj->kobj, &cpuidle_state_s2idle_group);
386 if (ret)
387 pr_debug("%s: sysfs attribute group not created\n", __func__);
388}
389
390static void cpuidle_remove_s2idle_attr_group(struct cpuidle_state_kobj *kobj)
391{
392 if (kobj->state->enter_s2idle)
393 sysfs_remove_group(&kobj->kobj, &cpuidle_state_s2idle_group);
394}
395#else
396static inline void cpuidle_add_s2idle_attr_group(struct cpuidle_state_kobj *kobj) { }
397static inline void cpuidle_remove_s2idle_attr_group(struct cpuidle_state_kobj *kobj) { }
398#endif /* CONFIG_SUSPEND */
399
400#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
401#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
402#define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage)
403#define kobj_to_device(k) (kobj_to_state_obj(k)->device)
404#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
405
406static ssize_t cpuidle_state_show(struct kobject *kobj, struct attribute *attr,
407 char *buf)
408{
409 int ret = -EIO;
410 struct cpuidle_state *state = kobj_to_state(kobj);
411 struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
412 struct cpuidle_state_attr *cattr = attr_to_stateattr(attr);
413
414 if (cattr->show)
415 ret = cattr->show(state, state_usage, buf);
416
417 return ret;
418}
419
420static ssize_t cpuidle_state_store(struct kobject *kobj, struct attribute *attr,
421 const char *buf, size_t size)
422{
423 int ret = -EIO;
424 struct cpuidle_state *state = kobj_to_state(kobj);
425 struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
426 struct cpuidle_state_attr *cattr = attr_to_stateattr(attr);
427 struct cpuidle_device *dev = kobj_to_device(kobj);
428
429 if (cattr->store)
430 ret = cattr->store(state, state_usage, buf, size);
431
432 /* reset poll time cache */
433 dev->poll_limit_ns = 0;
434
435 return ret;
436}
437
438static const struct sysfs_ops cpuidle_state_sysfs_ops = {
439 .show = cpuidle_state_show,
440 .store = cpuidle_state_store,
441};
442
443static void cpuidle_state_sysfs_release(struct kobject *kobj)
444{
445 struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
446
447 complete(&state_obj->kobj_unregister);
448}
449
450static struct kobj_type ktype_state_cpuidle = {
451 .sysfs_ops = &cpuidle_state_sysfs_ops,
452 .default_groups = cpuidle_state_default_groups,
453 .release = cpuidle_state_sysfs_release,
454};
455
456static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
457{
458 cpuidle_remove_s2idle_attr_group(device->kobjs[i]);
459 kobject_put(&device->kobjs[i]->kobj);
460 wait_for_completion(&device->kobjs[i]->kobj_unregister);
461 kfree(device->kobjs[i]);
462 device->kobjs[i] = NULL;
463}
464
465/**
466 * cpuidle_add_state_sysfs - adds cpuidle states sysfs attributes
467 * @device: the target device
468 */
469static int cpuidle_add_state_sysfs(struct cpuidle_device *device)
470{
471 int i, ret = -ENOMEM;
472 struct cpuidle_state_kobj *kobj;
473 struct cpuidle_device_kobj *kdev = device->kobj_dev;
474 struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
475
476 /* state statistics */
477 for (i = 0; i < drv->state_count; i++) {
478 kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
479 if (!kobj) {
480 ret = -ENOMEM;
481 goto error_state;
482 }
483 kobj->state = &drv->states[i];
484 kobj->state_usage = &device->states_usage[i];
485 kobj->device = device;
486 init_completion(&kobj->kobj_unregister);
487
488 ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle,
489 &kdev->kobj, "state%d", i);
490 if (ret) {
491 kobject_put(&kobj->kobj);
492 kfree(kobj);
493 goto error_state;
494 }
495 cpuidle_add_s2idle_attr_group(kobj);
496 kobject_uevent(&kobj->kobj, KOBJ_ADD);
497 device->kobjs[i] = kobj;
498 }
499
500 return 0;
501
502error_state:
503 for (i = i - 1; i >= 0; i--)
504 cpuidle_free_state_kobj(device, i);
505 return ret;
506}
507
508/**
509 * cpuidle_remove_state_sysfs - removes the cpuidle states sysfs attributes
510 * @device: the target device
511 */
512static void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
513{
514 struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
515 int i;
516
517 for (i = 0; i < drv->state_count; i++)
518 cpuidle_free_state_kobj(device, i);
519}
520
521#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
522#define kobj_to_driver_kobj(k) container_of(k, struct cpuidle_driver_kobj, kobj)
523#define attr_to_driver_attr(a) container_of(a, struct cpuidle_driver_attr, attr)
524
525#define define_one_driver_ro(_name, show) \
526 static struct cpuidle_driver_attr attr_driver_##_name = \
527 __ATTR(_name, 0444, show, NULL)
528
529struct cpuidle_driver_kobj {
530 struct cpuidle_driver *drv;
531 struct completion kobj_unregister;
532 struct kobject kobj;
533};
534
535struct cpuidle_driver_attr {
536 struct attribute attr;
537 ssize_t (*show)(struct cpuidle_driver *, char *);
538 ssize_t (*store)(struct cpuidle_driver *, const char *, size_t);
539};
540
541static ssize_t show_driver_name(struct cpuidle_driver *drv, char *buf)
542{
543 ssize_t ret;
544
545 spin_lock(&cpuidle_driver_lock);
546 ret = sprintf(buf, "%s\n", drv ? drv->name : "none");
547 spin_unlock(&cpuidle_driver_lock);
548
549 return ret;
550}
551
552static void cpuidle_driver_sysfs_release(struct kobject *kobj)
553{
554 struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
555 complete(&driver_kobj->kobj_unregister);
556}
557
558static ssize_t cpuidle_driver_show(struct kobject *kobj, struct attribute *attr,
559 char *buf)
560{
561 int ret = -EIO;
562 struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
563 struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
564
565 if (dattr->show)
566 ret = dattr->show(driver_kobj->drv, buf);
567
568 return ret;
569}
570
571static ssize_t cpuidle_driver_store(struct kobject *kobj, struct attribute *attr,
572 const char *buf, size_t size)
573{
574 int ret = -EIO;
575 struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
576 struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
577
578 if (dattr->store)
579 ret = dattr->store(driver_kobj->drv, buf, size);
580
581 return ret;
582}
583
584define_one_driver_ro(name, show_driver_name);
585
586static const struct sysfs_ops cpuidle_driver_sysfs_ops = {
587 .show = cpuidle_driver_show,
588 .store = cpuidle_driver_store,
589};
590
591static struct attribute *cpuidle_driver_default_attrs[] = {
592 &attr_driver_name.attr,
593 NULL
594};
595ATTRIBUTE_GROUPS(cpuidle_driver_default);
596
597static struct kobj_type ktype_driver_cpuidle = {
598 .sysfs_ops = &cpuidle_driver_sysfs_ops,
599 .default_groups = cpuidle_driver_default_groups,
600 .release = cpuidle_driver_sysfs_release,
601};
602
603/**
604 * cpuidle_add_driver_sysfs - adds the driver name sysfs attribute
605 * @dev: the target device
606 */
607static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
608{
609 struct cpuidle_driver_kobj *kdrv;
610 struct cpuidle_device_kobj *kdev = dev->kobj_dev;
611 struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
612 int ret;
613
614 kdrv = kzalloc(sizeof(*kdrv), GFP_KERNEL);
615 if (!kdrv)
616 return -ENOMEM;
617
618 kdrv->drv = drv;
619 init_completion(&kdrv->kobj_unregister);
620
621 ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle,
622 &kdev->kobj, "driver");
623 if (ret) {
624 kobject_put(&kdrv->kobj);
625 kfree(kdrv);
626 return ret;
627 }
628
629 kobject_uevent(&kdrv->kobj, KOBJ_ADD);
630 dev->kobj_driver = kdrv;
631
632 return ret;
633}
634
635/**
636 * cpuidle_remove_driver_sysfs - removes the driver name sysfs attribute
637 * @dev: the target device
638 */
639static void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
640{
641 struct cpuidle_driver_kobj *kdrv = dev->kobj_driver;
642 kobject_put(&kdrv->kobj);
643 wait_for_completion(&kdrv->kobj_unregister);
644 kfree(kdrv);
645}
646#else
647static inline int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
648{
649 return 0;
650}
651
652static inline void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
653{
654 ;
655}
656#endif
657
658/**
659 * cpuidle_add_device_sysfs - adds device specific sysfs attributes
660 * @device: the target device
661 */
662int cpuidle_add_device_sysfs(struct cpuidle_device *device)
663{
664 int ret;
665
666 ret = cpuidle_add_state_sysfs(device);
667 if (ret)
668 return ret;
669
670 ret = cpuidle_add_driver_sysfs(device);
671 if (ret)
672 cpuidle_remove_state_sysfs(device);
673 return ret;
674}
675
676/**
677 * cpuidle_remove_device_sysfs : removes device specific sysfs attributes
678 * @device : the target device
679 */
680void cpuidle_remove_device_sysfs(struct cpuidle_device *device)
681{
682 cpuidle_remove_driver_sysfs(device);
683 cpuidle_remove_state_sysfs(device);
684}
685
686/**
687 * cpuidle_add_sysfs - creates a sysfs instance for the target device
688 * @dev: the target device
689 */
690int cpuidle_add_sysfs(struct cpuidle_device *dev)
691{
692 struct cpuidle_device_kobj *kdev;
693 struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);
694 int error;
695
696 /*
697 * Return if cpu_device is not setup for this CPU.
698 *
699 * This could happen if the arch did not set up cpu_device
700 * since this CPU is not in cpu_present mask and the
701 * driver did not send a correct CPU mask during registration.
702 * Without this check we would end up passing bogus
703 * value for &cpu_dev->kobj in kobject_init_and_add()
704 */
705 if (!cpu_dev)
706 return -ENODEV;
707
708 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
709 if (!kdev)
710 return -ENOMEM;
711 kdev->dev = dev;
712
713 init_completion(&kdev->kobj_unregister);
714
715 error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
716 "cpuidle");
717 if (error) {
718 kobject_put(&kdev->kobj);
719 kfree(kdev);
720 return error;
721 }
722
723 dev->kobj_dev = kdev;
724 kobject_uevent(&kdev->kobj, KOBJ_ADD);
725
726 return 0;
727}
728
729/**
730 * cpuidle_remove_sysfs - deletes a sysfs instance on the target device
731 * @dev: the target device
732 */
733void cpuidle_remove_sysfs(struct cpuidle_device *dev)
734{
735 struct cpuidle_device_kobj *kdev = dev->kobj_dev;
736
737 kobject_put(&kdev->kobj);
738 wait_for_completion(&kdev->kobj_unregister);
739 kfree(kdev);
740}