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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/capability.h>
15
16#include "cpuidle.h"
17
18static unsigned int sysfs_switch;
19static int __init cpuidle_sysfs_setup(char *unused)
20{
21 sysfs_switch = 1;
22 return 1;
23}
24__setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup);
25
26static ssize_t show_available_governors(struct device *dev,
27 struct device_attribute *attr,
28 char *buf)
29{
30 ssize_t i = 0;
31 struct cpuidle_governor *tmp;
32
33 mutex_lock(&cpuidle_lock);
34 list_for_each_entry(tmp, &cpuidle_governors, governor_list) {
35 if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - CPUIDLE_NAME_LEN - 2))
36 goto out;
37 i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name);
38 }
39
40out:
41 i+= sprintf(&buf[i], "\n");
42 mutex_unlock(&cpuidle_lock);
43 return i;
44}
45
46static ssize_t show_current_driver(struct device *dev,
47 struct device_attribute *attr,
48 char *buf)
49{
50 ssize_t ret;
51 struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
52
53 spin_lock(&cpuidle_driver_lock);
54 if (cpuidle_driver)
55 ret = sprintf(buf, "%s\n", cpuidle_driver->name);
56 else
57 ret = sprintf(buf, "none\n");
58 spin_unlock(&cpuidle_driver_lock);
59
60 return ret;
61}
62
63static ssize_t show_current_governor(struct device *dev,
64 struct device_attribute *attr,
65 char *buf)
66{
67 ssize_t ret;
68
69 mutex_lock(&cpuidle_lock);
70 if (cpuidle_curr_governor)
71 ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name);
72 else
73 ret = sprintf(buf, "none\n");
74 mutex_unlock(&cpuidle_lock);
75
76 return ret;
77}
78
79static ssize_t store_current_governor(struct device *dev,
80 struct device_attribute *attr,
81 const char *buf, size_t count)
82{
83 char gov_name[CPUIDLE_NAME_LEN];
84 int ret = -EINVAL;
85 size_t len = count;
86 struct cpuidle_governor *gov;
87
88 if (!len || len >= sizeof(gov_name))
89 return -EINVAL;
90
91 memcpy(gov_name, buf, len);
92 gov_name[len] = '\0';
93 if (gov_name[len - 1] == '\n')
94 gov_name[--len] = '\0';
95
96 mutex_lock(&cpuidle_lock);
97
98 list_for_each_entry(gov, &cpuidle_governors, governor_list) {
99 if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) {
100 ret = cpuidle_switch_governor(gov);
101 break;
102 }
103 }
104
105 mutex_unlock(&cpuidle_lock);
106
107 if (ret)
108 return ret;
109 else
110 return count;
111}
112
113static DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL);
114static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL);
115
116static struct attribute *cpuidle_default_attrs[] = {
117 &dev_attr_current_driver.attr,
118 &dev_attr_current_governor_ro.attr,
119 NULL
120};
121
122static DEVICE_ATTR(available_governors, 0444, show_available_governors, NULL);
123static DEVICE_ATTR(current_governor, 0644, show_current_governor,
124 store_current_governor);
125
126static struct attribute *cpuidle_switch_attrs[] = {
127 &dev_attr_available_governors.attr,
128 &dev_attr_current_driver.attr,
129 &dev_attr_current_governor.attr,
130 NULL
131};
132
133static struct attribute_group cpuidle_attr_group = {
134 .attrs = cpuidle_default_attrs,
135 .name = "cpuidle",
136};
137
138/**
139 * cpuidle_add_interface - add CPU global sysfs attributes
140 */
141int cpuidle_add_interface(struct device *dev)
142{
143 if (sysfs_switch)
144 cpuidle_attr_group.attrs = cpuidle_switch_attrs;
145
146 return sysfs_create_group(&dev->kobj, &cpuidle_attr_group);
147}
148
149/**
150 * cpuidle_remove_interface - remove CPU global sysfs attributes
151 */
152void cpuidle_remove_interface(struct device *dev)
153{
154 sysfs_remove_group(&dev->kobj, &cpuidle_attr_group);
155}
156
157struct cpuidle_attr {
158 struct attribute attr;
159 ssize_t (*show)(struct cpuidle_device *, char *);
160 ssize_t (*store)(struct cpuidle_device *, const char *, size_t count);
161};
162
163#define define_one_ro(_name, show) \
164 static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
165#define define_one_rw(_name, show, store) \
166 static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store)
167
168#define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj)
169#define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
170static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf)
171{
172 int ret = -EIO;
173 struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
174 struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
175
176 if (cattr->show) {
177 mutex_lock(&cpuidle_lock);
178 ret = cattr->show(dev, buf);
179 mutex_unlock(&cpuidle_lock);
180 }
181 return ret;
182}
183
184static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr,
185 const char * buf, size_t count)
186{
187 int ret = -EIO;
188 struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
189 struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
190
191 if (cattr->store) {
192 mutex_lock(&cpuidle_lock);
193 ret = cattr->store(dev, buf, count);
194 mutex_unlock(&cpuidle_lock);
195 }
196 return ret;
197}
198
199static const struct sysfs_ops cpuidle_sysfs_ops = {
200 .show = cpuidle_show,
201 .store = cpuidle_store,
202};
203
204static void cpuidle_sysfs_release(struct kobject *kobj)
205{
206 struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
207
208 complete(&dev->kobj_unregister);
209}
210
211static struct kobj_type ktype_cpuidle = {
212 .sysfs_ops = &cpuidle_sysfs_ops,
213 .release = cpuidle_sysfs_release,
214};
215
216struct cpuidle_state_attr {
217 struct attribute attr;
218 ssize_t (*show)(struct cpuidle_state *, \
219 struct cpuidle_state_usage *, char *);
220 ssize_t (*store)(struct cpuidle_state *, const char *, size_t);
221};
222
223#define define_one_state_ro(_name, show) \
224static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
225
226#define define_one_state_rw(_name, show, store) \
227static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store)
228
229#define define_show_state_function(_name) \
230static ssize_t show_state_##_name(struct cpuidle_state *state, \
231 struct cpuidle_state_usage *state_usage, char *buf) \
232{ \
233 return sprintf(buf, "%u\n", state->_name);\
234}
235
236#define define_store_state_function(_name) \
237static ssize_t store_state_##_name(struct cpuidle_state *state, \
238 const char *buf, size_t size) \
239{ \
240 long value; \
241 int err; \
242 if (!capable(CAP_SYS_ADMIN)) \
243 return -EPERM; \
244 err = kstrtol(buf, 0, &value); \
245 if (err) \
246 return err; \
247 if (value) \
248 state->disable = 1; \
249 else \
250 state->disable = 0; \
251 return size; \
252}
253
254#define define_show_state_ull_function(_name) \
255static ssize_t show_state_##_name(struct cpuidle_state *state, \
256 struct cpuidle_state_usage *state_usage, char *buf) \
257{ \
258 return sprintf(buf, "%llu\n", state_usage->_name);\
259}
260
261#define define_show_state_str_function(_name) \
262static ssize_t show_state_##_name(struct cpuidle_state *state, \
263 struct cpuidle_state_usage *state_usage, char *buf) \
264{ \
265 if (state->_name[0] == '\0')\
266 return sprintf(buf, "<null>\n");\
267 return sprintf(buf, "%s\n", state->_name);\
268}
269
270define_show_state_function(exit_latency)
271define_show_state_function(power_usage)
272define_show_state_ull_function(usage)
273define_show_state_ull_function(time)
274define_show_state_str_function(name)
275define_show_state_str_function(desc)
276define_show_state_function(disable)
277define_store_state_function(disable)
278
279define_one_state_ro(name, show_state_name);
280define_one_state_ro(desc, show_state_desc);
281define_one_state_ro(latency, show_state_exit_latency);
282define_one_state_ro(power, show_state_power_usage);
283define_one_state_ro(usage, show_state_usage);
284define_one_state_ro(time, show_state_time);
285define_one_state_rw(disable, show_state_disable, store_state_disable);
286
287static struct attribute *cpuidle_state_default_attrs[] = {
288 &attr_name.attr,
289 &attr_desc.attr,
290 &attr_latency.attr,
291 &attr_power.attr,
292 &attr_usage.attr,
293 &attr_time.attr,
294 &attr_disable.attr,
295 NULL
296};
297
298#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
299#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
300#define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage)
301#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
302static ssize_t cpuidle_state_show(struct kobject * kobj,
303 struct attribute * attr ,char * buf)
304{
305 int ret = -EIO;
306 struct cpuidle_state *state = kobj_to_state(kobj);
307 struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
308 struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);
309
310 if (cattr->show)
311 ret = cattr->show(state, state_usage, buf);
312
313 return ret;
314}
315
316static ssize_t cpuidle_state_store(struct kobject *kobj,
317 struct attribute *attr, const char *buf, size_t size)
318{
319 int ret = -EIO;
320 struct cpuidle_state *state = kobj_to_state(kobj);
321 struct cpuidle_state_attr *cattr = attr_to_stateattr(attr);
322
323 if (cattr->store)
324 ret = cattr->store(state, buf, size);
325
326 return ret;
327}
328
329static const struct sysfs_ops cpuidle_state_sysfs_ops = {
330 .show = cpuidle_state_show,
331 .store = cpuidle_state_store,
332};
333
334static void cpuidle_state_sysfs_release(struct kobject *kobj)
335{
336 struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
337
338 complete(&state_obj->kobj_unregister);
339}
340
341static struct kobj_type ktype_state_cpuidle = {
342 .sysfs_ops = &cpuidle_state_sysfs_ops,
343 .default_attrs = cpuidle_state_default_attrs,
344 .release = cpuidle_state_sysfs_release,
345};
346
347static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
348{
349 kobject_put(&device->kobjs[i]->kobj);
350 wait_for_completion(&device->kobjs[i]->kobj_unregister);
351 kfree(device->kobjs[i]);
352 device->kobjs[i] = NULL;
353}
354
355/**
356 * cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes
357 * @device: the target device
358 */
359int cpuidle_add_state_sysfs(struct cpuidle_device *device)
360{
361 int i, ret = -ENOMEM;
362 struct cpuidle_state_kobj *kobj;
363 struct cpuidle_driver *drv = cpuidle_get_driver();
364
365 /* state statistics */
366 for (i = 0; i < device->state_count; i++) {
367 kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
368 if (!kobj)
369 goto error_state;
370 kobj->state = &drv->states[i];
371 kobj->state_usage = &device->states_usage[i];
372 init_completion(&kobj->kobj_unregister);
373
374 ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, &device->kobj,
375 "state%d", i);
376 if (ret) {
377 kfree(kobj);
378 goto error_state;
379 }
380 kobject_uevent(&kobj->kobj, KOBJ_ADD);
381 device->kobjs[i] = kobj;
382 }
383
384 return 0;
385
386error_state:
387 for (i = i - 1; i >= 0; i--)
388 cpuidle_free_state_kobj(device, i);
389 return ret;
390}
391
392/**
393 * cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes
394 * @device: the target device
395 */
396void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
397{
398 int i;
399
400 for (i = 0; i < device->state_count; i++)
401 cpuidle_free_state_kobj(device, i);
402}
403
404/**
405 * cpuidle_add_sysfs - creates a sysfs instance for the target device
406 * @dev: the target device
407 */
408int cpuidle_add_sysfs(struct device *cpu_dev)
409{
410 int cpu = cpu_dev->id;
411 struct cpuidle_device *dev;
412 int error;
413
414 dev = per_cpu(cpuidle_devices, cpu);
415 error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
416 "cpuidle");
417 if (!error)
418 kobject_uevent(&dev->kobj, KOBJ_ADD);
419 return error;
420}
421
422/**
423 * cpuidle_remove_sysfs - deletes a sysfs instance on the target device
424 * @dev: the target device
425 */
426void cpuidle_remove_sysfs(struct device *cpu_dev)
427{
428 int cpu = cpu_dev->id;
429 struct cpuidle_device *dev;
430
431 dev = per_cpu(cpuidle_devices, cpu);
432 kobject_put(&dev->kobj);
433}