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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
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
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 *, \
220 struct cpuidle_state_usage *, char *);
221 ssize_t (*store)(struct cpuidle_state *, const char *, size_t);
222};
223
224#define define_one_state_ro(_name, show) \
225static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
226
227#define define_show_state_function(_name) \
228static ssize_t show_state_##_name(struct cpuidle_state *state, \
229 struct cpuidle_state_usage *state_usage, char *buf) \
230{ \
231 return sprintf(buf, "%u\n", state->_name);\
232}
233
234#define define_show_state_ull_function(_name) \
235static ssize_t show_state_##_name(struct cpuidle_state *state, \
236 struct cpuidle_state_usage *state_usage, char *buf) \
237{ \
238 return sprintf(buf, "%llu\n", state_usage->_name);\
239}
240
241#define define_show_state_str_function(_name) \
242static ssize_t show_state_##_name(struct cpuidle_state *state, \
243 struct cpuidle_state_usage *state_usage, char *buf) \
244{ \
245 if (state->_name[0] == '\0')\
246 return sprintf(buf, "<null>\n");\
247 return sprintf(buf, "%s\n", state->_name);\
248}
249
250define_show_state_function(exit_latency)
251define_show_state_function(power_usage)
252define_show_state_ull_function(usage)
253define_show_state_ull_function(time)
254define_show_state_str_function(name)
255define_show_state_str_function(desc)
256
257define_one_state_ro(name, show_state_name);
258define_one_state_ro(desc, show_state_desc);
259define_one_state_ro(latency, show_state_exit_latency);
260define_one_state_ro(power, show_state_power_usage);
261define_one_state_ro(usage, show_state_usage);
262define_one_state_ro(time, show_state_time);
263
264static struct attribute *cpuidle_state_default_attrs[] = {
265 &attr_name.attr,
266 &attr_desc.attr,
267 &attr_latency.attr,
268 &attr_power.attr,
269 &attr_usage.attr,
270 &attr_time.attr,
271 NULL
272};
273
274#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
275#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
276#define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage)
277#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
278static ssize_t cpuidle_state_show(struct kobject * kobj,
279 struct attribute * attr ,char * buf)
280{
281 int ret = -EIO;
282 struct cpuidle_state *state = kobj_to_state(kobj);
283 struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
284 struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);
285
286 if (cattr->show)
287 ret = cattr->show(state, state_usage, buf);
288
289 return ret;
290}
291
292static const struct sysfs_ops cpuidle_state_sysfs_ops = {
293 .show = cpuidle_state_show,
294};
295
296static void cpuidle_state_sysfs_release(struct kobject *kobj)
297{
298 struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
299
300 complete(&state_obj->kobj_unregister);
301}
302
303static struct kobj_type ktype_state_cpuidle = {
304 .sysfs_ops = &cpuidle_state_sysfs_ops,
305 .default_attrs = cpuidle_state_default_attrs,
306 .release = cpuidle_state_sysfs_release,
307};
308
309static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
310{
311 kobject_put(&device->kobjs[i]->kobj);
312 wait_for_completion(&device->kobjs[i]->kobj_unregister);
313 kfree(device->kobjs[i]);
314 device->kobjs[i] = NULL;
315}
316
317
318
319
320
321int cpuidle_add_state_sysfs(struct cpuidle_device *device)
322{
323 int i, ret = -ENOMEM;
324 struct cpuidle_state_kobj *kobj;
325 struct cpuidle_driver *drv = cpuidle_get_driver();
326
327
328 for (i = 0; i < device->state_count; i++) {
329 kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
330 if (!kobj)
331 goto error_state;
332 kobj->state = &drv->states[i];
333 kobj->state_usage = &device->states_usage[i];
334 init_completion(&kobj->kobj_unregister);
335
336 ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, &device->kobj,
337 "state%d", i);
338 if (ret) {
339 kfree(kobj);
340 goto error_state;
341 }
342 kobject_uevent(&kobj->kobj, KOBJ_ADD);
343 device->kobjs[i] = kobj;
344 }
345
346 return 0;
347
348error_state:
349 for (i = i - 1; i >= 0; i--)
350 cpuidle_free_state_kobj(device, i);
351 return ret;
352}
353
354
355
356
357
358void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
359{
360 int i;
361
362 for (i = 0; i < device->state_count; i++)
363 cpuidle_free_state_kobj(device, i);
364}
365
366
367
368
369
370int cpuidle_add_sysfs(struct sys_device *sysdev)
371{
372 int cpu = sysdev->id;
373 struct cpuidle_device *dev;
374 int error;
375
376 dev = per_cpu(cpuidle_devices, cpu);
377 error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &sysdev->kobj,
378 "cpuidle");
379 if (!error)
380 kobject_uevent(&dev->kobj, KOBJ_ADD);
381 return error;
382}
383
384
385
386
387
388void cpuidle_remove_sysfs(struct sys_device *sysdev)
389{
390 int cpu = sysdev->id;
391 struct cpuidle_device *dev;
392
393 dev = per_cpu(cpuidle_devices, cpu);
394 kobject_put(&dev->kobj);
395}
396
