Commit | Line | Data |
---|---|---|
4f86d3a8 LB |
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> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
4f86d3a8 | 13 | #include <linux/cpu.h> |
728ce22b | 14 | #include <linux/completion.h> |
3a53396b | 15 | #include <linux/capability.h> |
8f3e9953 | 16 | #include <linux/device.h> |
728ce22b | 17 | #include <linux/kobject.h> |
4f86d3a8 LB |
18 | |
19 | #include "cpuidle.h" | |
20 | ||
8a25a2fd KS |
21 | static ssize_t show_available_governors(struct device *dev, |
22 | struct device_attribute *attr, | |
66198f36 | 23 | char *buf) |
4f86d3a8 LB |
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) { | |
3f9f8daa | 30 | if (i >= (ssize_t) (PAGE_SIZE - (CPUIDLE_NAME_LEN + 2))) |
4f86d3a8 | 31 | goto out; |
3f9f8daa HG |
32 | |
33 | i += scnprintf(&buf[i], CPUIDLE_NAME_LEN + 1, "%s ", tmp->name); | |
4f86d3a8 LB |
34 | } |
35 | ||
36 | out: | |
37 | i+= sprintf(&buf[i], "\n"); | |
38 | mutex_unlock(&cpuidle_lock); | |
39 | return i; | |
40 | } | |
41 | ||
8a25a2fd KS |
42 | static ssize_t show_current_driver(struct device *dev, |
43 | struct device_attribute *attr, | |
66198f36 | 44 | char *buf) |
4f86d3a8 LB |
45 | { |
46 | ssize_t ret; | |
1f6b9f74 | 47 | struct cpuidle_driver *drv; |
4f86d3a8 LB |
48 | |
49 | spin_lock(&cpuidle_driver_lock); | |
1f6b9f74 VK |
50 | drv = cpuidle_get_driver(); |
51 | if (drv) | |
52 | ret = sprintf(buf, "%s\n", drv->name); | |
4f86d3a8 LB |
53 | else |
54 | ret = sprintf(buf, "none\n"); | |
55 | spin_unlock(&cpuidle_driver_lock); | |
56 | ||
57 | return ret; | |
58 | } | |
59 | ||
8a25a2fd KS |
60 | static ssize_t show_current_governor(struct device *dev, |
61 | struct device_attribute *attr, | |
66198f36 | 62 | char *buf) |
4f86d3a8 LB |
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 | ||
8a25a2fd KS |
76 | static ssize_t store_current_governor(struct device *dev, |
77 | struct device_attribute *attr, | |
66198f36 | 78 | const char *buf, size_t count) |
4f86d3a8 | 79 | { |
ef7e7d65 HG |
80 | char gov_name[CPUIDLE_NAME_LEN + 1]; |
81 | int ret; | |
4f86d3a8 LB |
82 | struct cpuidle_governor *gov; |
83 | ||
ef7e7d65 HG |
84 | ret = sscanf(buf, "%" __stringify(CPUIDLE_NAME_LEN) "s", gov_name); |
85 | if (ret != 1) | |
4f86d3a8 LB |
86 | return -EINVAL; |
87 | ||
4f86d3a8 | 88 | mutex_lock(&cpuidle_lock); |
ef7e7d65 | 89 | ret = -EINVAL; |
4f86d3a8 | 90 | list_for_each_entry(gov, &cpuidle_governors, governor_list) { |
ef7e7d65 | 91 | if (!strncmp(gov->name, gov_name, CPUIDLE_NAME_LEN)) { |
4f86d3a8 LB |
92 | ret = cpuidle_switch_governor(gov); |
93 | break; | |
94 | } | |
95 | } | |
4f86d3a8 LB |
96 | mutex_unlock(&cpuidle_lock); |
97 | ||
ef7e7d65 | 98 | return ret ? ret : count; |
4f86d3a8 LB |
99 | } |
100 | ||
b52e93e4 | 101 | static DEVICE_ATTR(available_governors, 0444, show_available_governors, NULL); |
8a25a2fd | 102 | static DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL); |
b52e93e4 HG |
103 | static DEVICE_ATTR(current_governor, 0644, show_current_governor, |
104 | store_current_governor); | |
8a25a2fd | 105 | static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL); |
4f86d3a8 | 106 | |
cce55cc9 | 107 | static struct attribute *cpuidle_attrs[] = { |
b52e93e4 | 108 | &dev_attr_available_governors.attr, |
8a25a2fd | 109 | &dev_attr_current_driver.attr, |
b52e93e4 | 110 | &dev_attr_current_governor.attr, |
8a25a2fd | 111 | &dev_attr_current_governor_ro.attr, |
4f86d3a8 LB |
112 | NULL |
113 | }; | |
114 | ||
8a25a2fd | 115 | static struct attribute_group cpuidle_attr_group = { |
cce55cc9 | 116 | .attrs = cpuidle_attrs, |
4f86d3a8 LB |
117 | .name = "cpuidle", |
118 | }; | |
119 | ||
120 | /** | |
8a25a2fd | 121 | * cpuidle_add_interface - add CPU global sysfs attributes |
a09da3fb | 122 | * @dev: the target device |
4f86d3a8 | 123 | */ |
8a25a2fd | 124 | int cpuidle_add_interface(struct device *dev) |
4f86d3a8 | 125 | { |
8a25a2fd | 126 | return sysfs_create_group(&dev->kobj, &cpuidle_attr_group); |
4f86d3a8 LB |
127 | } |
128 | ||
129 | /** | |
8a25a2fd | 130 | * cpuidle_remove_interface - remove CPU global sysfs attributes |
a09da3fb | 131 | * @dev: the target device |
4f86d3a8 | 132 | */ |
8a25a2fd | 133 | void cpuidle_remove_interface(struct device *dev) |
4f86d3a8 | 134 | { |
8a25a2fd | 135 | sysfs_remove_group(&dev->kobj, &cpuidle_attr_group); |
4f86d3a8 LB |
136 | } |
137 | ||
138 | struct 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 | ||
4f86d3a8 | 144 | #define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr) |
f89ae89e | 145 | |
728ce22b DL |
146 | struct cpuidle_device_kobj { |
147 | struct cpuidle_device *dev; | |
148 | struct completion kobj_unregister; | |
149 | struct kobject kobj; | |
150 | }; | |
151 | ||
152 | static 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 | ||
f89ae89e DL |
160 | static ssize_t cpuidle_show(struct kobject *kobj, struct attribute *attr, |
161 | char *buf) | |
4f86d3a8 LB |
162 | { |
163 | int ret = -EIO; | |
728ce22b | 164 | struct cpuidle_device *dev = to_cpuidle_device(kobj); |
f89ae89e | 165 | struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr); |
4f86d3a8 LB |
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 | ||
f89ae89e DL |
175 | static ssize_t cpuidle_store(struct kobject *kobj, struct attribute *attr, |
176 | const char *buf, size_t count) | |
4f86d3a8 LB |
177 | { |
178 | int ret = -EIO; | |
728ce22b | 179 | struct cpuidle_device *dev = to_cpuidle_device(kobj); |
f89ae89e | 180 | struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr); |
4f86d3a8 LB |
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 | ||
52cf25d0 | 190 | static const struct sysfs_ops cpuidle_sysfs_ops = { |
4f86d3a8 LB |
191 | .show = cpuidle_show, |
192 | .store = cpuidle_store, | |
193 | }; | |
194 | ||
195 | static void cpuidle_sysfs_release(struct kobject *kobj) | |
196 | { | |
728ce22b DL |
197 | struct cpuidle_device_kobj *kdev = |
198 | container_of(kobj, struct cpuidle_device_kobj, kobj); | |
4f86d3a8 | 199 | |
728ce22b | 200 | complete(&kdev->kobj_unregister); |
4f86d3a8 LB |
201 | } |
202 | ||
e898b07d | 203 | static const struct kobj_type ktype_cpuidle = { |
4f86d3a8 LB |
204 | .sysfs_ops = &cpuidle_sysfs_ops, |
205 | .release = cpuidle_sysfs_release, | |
206 | }; | |
207 | ||
208 | struct cpuidle_state_attr { | |
209 | struct attribute attr; | |
4202735e DD |
210 | ssize_t (*show)(struct cpuidle_state *, \ |
211 | struct cpuidle_state_usage *, char *); | |
dc7fd275 SL |
212 | ssize_t (*store)(struct cpuidle_state *, \ |
213 | struct cpuidle_state_usage *, const char *, size_t); | |
4f86d3a8 LB |
214 | }; |
215 | ||
216 | #define define_one_state_ro(_name, show) \ | |
217 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL) | |
218 | ||
3a53396b SL |
219 | #define define_one_state_rw(_name, show, store) \ |
220 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store) | |
221 | ||
4f86d3a8 | 222 | #define define_show_state_function(_name) \ |
4202735e DD |
223 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
224 | struct cpuidle_state_usage *state_usage, char *buf) \ | |
4f86d3a8 LB |
225 | { \ |
226 | return sprintf(buf, "%u\n", state->_name);\ | |
227 | } | |
228 | ||
8b78cf60 | 229 | #define define_show_state_ull_function(_name) \ |
4202735e | 230 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
f89ae89e DL |
231 | struct cpuidle_state_usage *state_usage, \ |
232 | char *buf) \ | |
8b78cf60 | 233 | { \ |
4202735e | 234 | return sprintf(buf, "%llu\n", state_usage->_name);\ |
8b78cf60 YY |
235 | } |
236 | ||
4fcb2fcd | 237 | #define define_show_state_str_function(_name) \ |
4202735e | 238 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
f89ae89e DL |
239 | struct cpuidle_state_usage *state_usage, \ |
240 | char *buf) \ | |
4fcb2fcd VP |
241 | { \ |
242 | if (state->_name[0] == '\0')\ | |
243 | return sprintf(buf, "<null>\n");\ | |
244 | return sprintf(buf, "%s\n", state->_name);\ | |
4f86d3a8 LB |
245 | } |
246 | ||
c1d51f68 RW |
247 | #define define_show_state_time_function(_name) \ |
248 | static 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 | ||
255 | define_show_state_time_function(exit_latency) | |
256 | define_show_state_time_function(target_residency) | |
4f86d3a8 | 257 | define_show_state_function(power_usage) |
8b78cf60 | 258 | define_show_state_ull_function(usage) |
f49735f4 | 259 | define_show_state_ull_function(rejected) |
4fcb2fcd VP |
260 | define_show_state_str_function(name) |
261 | define_show_state_str_function(desc) | |
04dab58a RW |
262 | define_show_state_ull_function(above) |
263 | define_show_state_ull_function(below) | |
4fcb2fcd | 264 | |
c1d51f68 RW |
265 | static 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 | ||
99e98d3f RW |
272 | static 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 | ||
280 | static 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 | ||
75a80267 RW |
302 | static 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 | ||
4f86d3a8 | 310 | define_one_state_ro(name, show_state_name); |
4fcb2fcd | 311 | define_one_state_ro(desc, show_state_desc); |
4f86d3a8 | 312 | define_one_state_ro(latency, show_state_exit_latency); |
9bc0482f | 313 | define_one_state_ro(residency, show_state_target_residency); |
4f86d3a8 LB |
314 | define_one_state_ro(power, show_state_power_usage); |
315 | define_one_state_ro(usage, show_state_usage); | |
f49735f4 | 316 | define_one_state_ro(rejected, show_state_rejected); |
4f86d3a8 | 317 | define_one_state_ro(time, show_state_time); |
3a53396b | 318 | define_one_state_rw(disable, show_state_disable, store_state_disable); |
04dab58a RW |
319 | define_one_state_ro(above, show_state_above); |
320 | define_one_state_ro(below, show_state_below); | |
75a80267 | 321 | define_one_state_ro(default_status, show_state_default_status); |
4f86d3a8 LB |
322 | |
323 | static struct attribute *cpuidle_state_default_attrs[] = { | |
324 | &attr_name.attr, | |
4fcb2fcd | 325 | &attr_desc.attr, |
4f86d3a8 | 326 | &attr_latency.attr, |
9bc0482f | 327 | &attr_residency.attr, |
4f86d3a8 LB |
328 | &attr_power.attr, |
329 | &attr_usage.attr, | |
f49735f4 | 330 | &attr_rejected.attr, |
4f86d3a8 | 331 | &attr_time.attr, |
3a53396b | 332 | &attr_disable.attr, |
04dab58a RW |
333 | &attr_above.attr, |
334 | &attr_below.attr, | |
75a80267 | 335 | &attr_default_status.attr, |
4f86d3a8 LB |
336 | NULL |
337 | }; | |
7dfc5b6e | 338 | ATTRIBUTE_GROUPS(cpuidle_state_default); |
4f86d3a8 | 339 | |
349631e0 DL |
340 | struct cpuidle_state_kobj { |
341 | struct cpuidle_state *state; | |
342 | struct cpuidle_state_usage *state_usage; | |
343 | struct completion kobj_unregister; | |
344 | struct kobject kobj; | |
259231a0 | 345 | struct cpuidle_device *device; |
349631e0 DL |
346 | }; |
347 | ||
64bdff69 RW |
348 | #ifdef CONFIG_SUSPEND |
349 | #define define_show_state_s2idle_ull_function(_name) \ | |
350 | static 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 | ||
357 | define_show_state_s2idle_ull_function(usage); | |
358 | define_show_state_s2idle_ull_function(time); | |
359 | ||
360 | #define define_one_state_s2idle_ro(_name, show) \ | |
361 | static struct cpuidle_state_attr attr_s2idle_##_name = \ | |
362 | __ATTR(_name, 0444, show, NULL) | |
363 | ||
364 | define_one_state_s2idle_ro(usage, show_state_s2idle_usage); | |
365 | define_one_state_s2idle_ro(time, show_state_s2idle_time); | |
366 | ||
367 | static struct attribute *cpuidle_state_s2idle_attrs[] = { | |
368 | &attr_s2idle_usage.attr, | |
369 | &attr_s2idle_time.attr, | |
370 | NULL | |
371 | }; | |
372 | ||
373 | static const struct attribute_group cpuidle_state_s2idle_group = { | |
374 | .name = "s2idle", | |
375 | .attrs = cpuidle_state_s2idle_attrs, | |
376 | }; | |
377 | ||
378 | static 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 | ||
390 | static 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 | |
396 | static inline void cpuidle_add_s2idle_attr_group(struct cpuidle_state_kobj *kobj) { } | |
397 | static inline void cpuidle_remove_s2idle_attr_group(struct cpuidle_state_kobj *kobj) { } | |
398 | #endif /* CONFIG_SUSPEND */ | |
399 | ||
4f86d3a8 LB |
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) | |
4202735e | 402 | #define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage) |
259231a0 | 403 | #define kobj_to_device(k) (kobj_to_state_obj(k)->device) |
4f86d3a8 | 404 | #define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr) |
f89ae89e DL |
405 | |
406 | static ssize_t cpuidle_state_show(struct kobject *kobj, struct attribute *attr, | |
eba933ce | 407 | char *buf) |
4f86d3a8 LB |
408 | { |
409 | int ret = -EIO; | |
410 | struct cpuidle_state *state = kobj_to_state(kobj); | |
4202735e | 411 | struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj); |
eba933ce | 412 | struct cpuidle_state_attr *cattr = attr_to_stateattr(attr); |
4f86d3a8 LB |
413 | |
414 | if (cattr->show) | |
4202735e | 415 | ret = cattr->show(state, state_usage, buf); |
4f86d3a8 LB |
416 | |
417 | return ret; | |
418 | } | |
419 | ||
f89ae89e DL |
420 | static ssize_t cpuidle_state_store(struct kobject *kobj, struct attribute *attr, |
421 | const char *buf, size_t size) | |
3a53396b SL |
422 | { |
423 | int ret = -EIO; | |
424 | struct cpuidle_state *state = kobj_to_state(kobj); | |
dc7fd275 | 425 | struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj); |
3a53396b | 426 | struct cpuidle_state_attr *cattr = attr_to_stateattr(attr); |
259231a0 | 427 | struct cpuidle_device *dev = kobj_to_device(kobj); |
3a53396b SL |
428 | |
429 | if (cattr->store) | |
dc7fd275 | 430 | ret = cattr->store(state, state_usage, buf, size); |
3a53396b | 431 | |
259231a0 MT |
432 | /* reset poll time cache */ |
433 | dev->poll_limit_ns = 0; | |
434 | ||
3a53396b SL |
435 | return ret; |
436 | } | |
437 | ||
52cf25d0 | 438 | static const struct sysfs_ops cpuidle_state_sysfs_ops = { |
4f86d3a8 | 439 | .show = cpuidle_state_show, |
3a53396b | 440 | .store = cpuidle_state_store, |
4f86d3a8 LB |
441 | }; |
442 | ||
443 | static 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 | ||
e898b07d | 450 | static const struct kobj_type ktype_state_cpuidle = { |
4f86d3a8 | 451 | .sysfs_ops = &cpuidle_state_sysfs_ops, |
7dfc5b6e | 452 | .default_groups = cpuidle_state_default_groups, |
4f86d3a8 LB |
453 | .release = cpuidle_state_sysfs_release, |
454 | }; | |
455 | ||
42b16b3f | 456 | static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i) |
4f86d3a8 | 457 | { |
64bdff69 | 458 | cpuidle_remove_s2idle_attr_group(device->kobjs[i]); |
c10997f6 | 459 | kobject_put(&device->kobjs[i]->kobj); |
4f86d3a8 LB |
460 | wait_for_completion(&device->kobjs[i]->kobj_unregister); |
461 | kfree(device->kobjs[i]); | |
462 | device->kobjs[i] = NULL; | |
463 | } | |
464 | ||
465 | /** | |
bf4d1b5d | 466 | * cpuidle_add_state_sysfs - adds cpuidle states sysfs attributes |
4f86d3a8 LB |
467 | * @device: the target device |
468 | */ | |
bf4d1b5d | 469 | static int cpuidle_add_state_sysfs(struct cpuidle_device *device) |
4f86d3a8 LB |
470 | { |
471 | int i, ret = -ENOMEM; | |
472 | struct cpuidle_state_kobj *kobj; | |
728ce22b | 473 | struct cpuidle_device_kobj *kdev = device->kobj_dev; |
bf4d1b5d | 474 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device); |
4f86d3a8 LB |
475 | |
476 | /* state statistics */ | |
d75e4af1 | 477 | for (i = 0; i < drv->state_count; i++) { |
4f86d3a8 | 478 | kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL); |
8f6040ce PB |
479 | if (!kobj) { |
480 | ret = -ENOMEM; | |
4f86d3a8 | 481 | goto error_state; |
8f6040ce | 482 | } |
46bcfad7 | 483 | kobj->state = &drv->states[i]; |
4202735e | 484 | kobj->state_usage = &device->states_usage[i]; |
259231a0 | 485 | kobj->device = device; |
4f86d3a8 LB |
486 | init_completion(&kobj->kobj_unregister); |
487 | ||
e45a00d6 | 488 | ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, |
728ce22b | 489 | &kdev->kobj, "state%d", i); |
4f86d3a8 | 490 | if (ret) { |
c343bf1b | 491 | kobject_put(&kobj->kobj); |
e5f5a66c | 492 | kfree(kobj); |
4f86d3a8 LB |
493 | goto error_state; |
494 | } | |
64bdff69 | 495 | cpuidle_add_s2idle_attr_group(kobj); |
94f57f33 | 496 | kobject_uevent(&kobj->kobj, KOBJ_ADD); |
4f86d3a8 LB |
497 | device->kobjs[i] = kobj; |
498 | } | |
499 | ||
500 | return 0; | |
501 | ||
502 | error_state: | |
503 | for (i = i - 1; i >= 0; i--) | |
504 | cpuidle_free_state_kobj(device, i); | |
505 | return ret; | |
506 | } | |
507 | ||
508 | /** | |
d00ebcc6 | 509 | * cpuidle_remove_state_sysfs - removes the cpuidle states sysfs attributes |
4f86d3a8 LB |
510 | * @device: the target device |
511 | */ | |
bf4d1b5d | 512 | static void cpuidle_remove_state_sysfs(struct cpuidle_device *device) |
4f86d3a8 | 513 | { |
d75e4af1 | 514 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device); |
4f86d3a8 LB |
515 | int i; |
516 | ||
d75e4af1 | 517 | for (i = 0; i < drv->state_count; i++) |
4f86d3a8 LB |
518 | cpuidle_free_state_kobj(device, i); |
519 | } | |
520 | ||
bf4d1b5d DL |
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 = \ | |
4f8eea9b | 527 | __ATTR(_name, 0444, show, NULL) |
bf4d1b5d DL |
528 | |
529 | struct cpuidle_driver_kobj { | |
530 | struct cpuidle_driver *drv; | |
531 | struct completion kobj_unregister; | |
532 | struct kobject kobj; | |
533 | }; | |
534 | ||
535 | struct 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 | ||
541 | static 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 | ||
552 | static 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 | ||
f89ae89e DL |
558 | static ssize_t cpuidle_driver_show(struct kobject *kobj, struct attribute *attr, |
559 | char *buf) | |
bf4d1b5d DL |
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 | ||
571 | static 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 | ||
584 | define_one_driver_ro(name, show_driver_name); | |
585 | ||
586 | static const struct sysfs_ops cpuidle_driver_sysfs_ops = { | |
587 | .show = cpuidle_driver_show, | |
588 | .store = cpuidle_driver_store, | |
589 | }; | |
590 | ||
591 | static struct attribute *cpuidle_driver_default_attrs[] = { | |
592 | &attr_driver_name.attr, | |
593 | NULL | |
594 | }; | |
7dfc5b6e | 595 | ATTRIBUTE_GROUPS(cpuidle_driver_default); |
bf4d1b5d | 596 | |
e898b07d | 597 | static const struct kobj_type ktype_driver_cpuidle = { |
bf4d1b5d | 598 | .sysfs_ops = &cpuidle_driver_sysfs_ops, |
7dfc5b6e | 599 | .default_groups = cpuidle_driver_default_groups, |
bf4d1b5d DL |
600 | .release = cpuidle_driver_sysfs_release, |
601 | }; | |
602 | ||
603 | /** | |
604 | * cpuidle_add_driver_sysfs - adds the driver name sysfs attribute | |
a09da3fb | 605 | * @dev: the target device |
bf4d1b5d DL |
606 | */ |
607 | static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev) | |
608 | { | |
609 | struct cpuidle_driver_kobj *kdrv; | |
728ce22b | 610 | struct cpuidle_device_kobj *kdev = dev->kobj_dev; |
bf4d1b5d DL |
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, | |
728ce22b | 622 | &kdev->kobj, "driver"); |
bf4d1b5d | 623 | if (ret) { |
c343bf1b | 624 | kobject_put(&kdrv->kobj); |
e5f5a66c | 625 | kfree(kdrv); |
bf4d1b5d DL |
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 | |
a09da3fb | 637 | * @dev: the target device |
bf4d1b5d DL |
638 | */ |
639 | static 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 | |
647 | static inline int cpuidle_add_driver_sysfs(struct cpuidle_device *dev) | |
648 | { | |
649 | return 0; | |
650 | } | |
651 | ||
652 | static 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 | */ | |
662 | int 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 | */ | |
680 | void cpuidle_remove_device_sysfs(struct cpuidle_device *device) | |
681 | { | |
682 | cpuidle_remove_driver_sysfs(device); | |
683 | cpuidle_remove_state_sysfs(device); | |
684 | } | |
685 | ||
4f86d3a8 LB |
686 | /** |
687 | * cpuidle_add_sysfs - creates a sysfs instance for the target device | |
8a25a2fd | 688 | * @dev: the target device |
4f86d3a8 | 689 | */ |
1aef40e2 | 690 | int cpuidle_add_sysfs(struct cpuidle_device *dev) |
4f86d3a8 | 691 | { |
728ce22b | 692 | struct cpuidle_device_kobj *kdev; |
1aef40e2 | 693 | struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu); |
94f57f33 | 694 | int error; |
4f86d3a8 | 695 | |
ad0a45fd VS |
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 | ||
728ce22b DL |
708 | kdev = kzalloc(sizeof(*kdev), GFP_KERNEL); |
709 | if (!kdev) | |
710 | return -ENOMEM; | |
711 | kdev->dev = dev; | |
728ce22b DL |
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) { | |
c343bf1b | 718 | kobject_put(&kdev->kobj); |
e5f5a66c | 719 | kfree(kdev); |
728ce22b DL |
720 | return error; |
721 | } | |
e45a00d6 | 722 | |
e5f5a66c | 723 | dev->kobj_dev = kdev; |
728ce22b DL |
724 | kobject_uevent(&kdev->kobj, KOBJ_ADD); |
725 | ||
726 | return 0; | |
4f86d3a8 LB |
727 | } |
728 | ||
729 | /** | |
730 | * cpuidle_remove_sysfs - deletes a sysfs instance on the target device | |
8a25a2fd | 731 | * @dev: the target device |
4f86d3a8 | 732 | */ |
1aef40e2 | 733 | void cpuidle_remove_sysfs(struct cpuidle_device *dev) |
4f86d3a8 | 734 | { |
728ce22b DL |
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); | |
4f86d3a8 | 740 | } |