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