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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/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}