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 | ||
21 | static unsigned int sysfs_switch; | |
22 | static int __init cpuidle_sysfs_setup(char *unused) | |
23 | { | |
24 | sysfs_switch = 1; | |
25 | return 1; | |
26 | } | |
27 | __setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup); | |
28 | ||
8a25a2fd KS |
29 | static ssize_t show_available_governors(struct device *dev, |
30 | struct device_attribute *attr, | |
66198f36 | 31 | char *buf) |
4f86d3a8 LB |
32 | { |
33 | ssize_t i = 0; | |
34 | struct cpuidle_governor *tmp; | |
35 | ||
36 | mutex_lock(&cpuidle_lock); | |
37 | list_for_each_entry(tmp, &cpuidle_governors, governor_list) { | |
f89ae89e DL |
38 | if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - |
39 | CPUIDLE_NAME_LEN - 2)) | |
4f86d3a8 LB |
40 | goto out; |
41 | i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name); | |
42 | } | |
43 | ||
44 | out: | |
45 | i+= sprintf(&buf[i], "\n"); | |
46 | mutex_unlock(&cpuidle_lock); | |
47 | return i; | |
48 | } | |
49 | ||
8a25a2fd KS |
50 | static ssize_t show_current_driver(struct device *dev, |
51 | struct device_attribute *attr, | |
66198f36 | 52 | char *buf) |
4f86d3a8 LB |
53 | { |
54 | ssize_t ret; | |
1f6b9f74 | 55 | struct cpuidle_driver *drv; |
4f86d3a8 LB |
56 | |
57 | spin_lock(&cpuidle_driver_lock); | |
1f6b9f74 VK |
58 | drv = cpuidle_get_driver(); |
59 | if (drv) | |
60 | ret = sprintf(buf, "%s\n", drv->name); | |
4f86d3a8 LB |
61 | else |
62 | ret = sprintf(buf, "none\n"); | |
63 | spin_unlock(&cpuidle_driver_lock); | |
64 | ||
65 | return ret; | |
66 | } | |
67 | ||
8a25a2fd KS |
68 | static ssize_t show_current_governor(struct device *dev, |
69 | struct device_attribute *attr, | |
66198f36 | 70 | char *buf) |
4f86d3a8 LB |
71 | { |
72 | ssize_t ret; | |
73 | ||
74 | mutex_lock(&cpuidle_lock); | |
75 | if (cpuidle_curr_governor) | |
76 | ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name); | |
77 | else | |
78 | ret = sprintf(buf, "none\n"); | |
79 | mutex_unlock(&cpuidle_lock); | |
80 | ||
81 | return ret; | |
82 | } | |
83 | ||
8a25a2fd KS |
84 | static ssize_t store_current_governor(struct device *dev, |
85 | struct device_attribute *attr, | |
66198f36 | 86 | const char *buf, size_t count) |
4f86d3a8 LB |
87 | { |
88 | char gov_name[CPUIDLE_NAME_LEN]; | |
89 | int ret = -EINVAL; | |
90 | size_t len = count; | |
91 | struct cpuidle_governor *gov; | |
92 | ||
93 | if (!len || len >= sizeof(gov_name)) | |
94 | return -EINVAL; | |
95 | ||
96 | memcpy(gov_name, buf, len); | |
97 | gov_name[len] = '\0'; | |
98 | if (gov_name[len - 1] == '\n') | |
99 | gov_name[--len] = '\0'; | |
100 | ||
101 | mutex_lock(&cpuidle_lock); | |
102 | ||
103 | list_for_each_entry(gov, &cpuidle_governors, governor_list) { | |
104 | if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) { | |
105 | ret = cpuidle_switch_governor(gov); | |
106 | break; | |
107 | } | |
108 | } | |
109 | ||
110 | mutex_unlock(&cpuidle_lock); | |
111 | ||
112 | if (ret) | |
113 | return ret; | |
114 | else | |
115 | return count; | |
116 | } | |
117 | ||
8a25a2fd KS |
118 | static DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL); |
119 | static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL); | |
4f86d3a8 | 120 | |
8a25a2fd KS |
121 | static struct attribute *cpuidle_default_attrs[] = { |
122 | &dev_attr_current_driver.attr, | |
123 | &dev_attr_current_governor_ro.attr, | |
4f86d3a8 LB |
124 | NULL |
125 | }; | |
126 | ||
8a25a2fd KS |
127 | static DEVICE_ATTR(available_governors, 0444, show_available_governors, NULL); |
128 | static DEVICE_ATTR(current_governor, 0644, show_current_governor, | |
129 | store_current_governor); | |
4f86d3a8 | 130 | |
8a25a2fd KS |
131 | static struct attribute *cpuidle_switch_attrs[] = { |
132 | &dev_attr_available_governors.attr, | |
133 | &dev_attr_current_driver.attr, | |
134 | &dev_attr_current_governor.attr, | |
4f86d3a8 LB |
135 | NULL |
136 | }; | |
137 | ||
8a25a2fd KS |
138 | static struct attribute_group cpuidle_attr_group = { |
139 | .attrs = cpuidle_default_attrs, | |
4f86d3a8 LB |
140 | .name = "cpuidle", |
141 | }; | |
142 | ||
143 | /** | |
8a25a2fd | 144 | * cpuidle_add_interface - add CPU global sysfs attributes |
4f86d3a8 | 145 | */ |
8a25a2fd | 146 | int cpuidle_add_interface(struct device *dev) |
4f86d3a8 LB |
147 | { |
148 | if (sysfs_switch) | |
8a25a2fd | 149 | cpuidle_attr_group.attrs = cpuidle_switch_attrs; |
4f86d3a8 | 150 | |
8a25a2fd | 151 | return sysfs_create_group(&dev->kobj, &cpuidle_attr_group); |
4f86d3a8 LB |
152 | } |
153 | ||
154 | /** | |
8a25a2fd | 155 | * cpuidle_remove_interface - remove CPU global sysfs attributes |
4f86d3a8 | 156 | */ |
8a25a2fd | 157 | void cpuidle_remove_interface(struct device *dev) |
4f86d3a8 | 158 | { |
8a25a2fd | 159 | sysfs_remove_group(&dev->kobj, &cpuidle_attr_group); |
4f86d3a8 LB |
160 | } |
161 | ||
162 | struct cpuidle_attr { | |
163 | struct attribute attr; | |
164 | ssize_t (*show)(struct cpuidle_device *, char *); | |
165 | ssize_t (*store)(struct cpuidle_device *, const char *, size_t count); | |
166 | }; | |
167 | ||
168 | #define define_one_ro(_name, show) \ | |
169 | static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL) | |
170 | #define define_one_rw(_name, show, store) \ | |
171 | static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store) | |
172 | ||
4f86d3a8 | 173 | #define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr) |
f89ae89e | 174 | |
728ce22b DL |
175 | struct cpuidle_device_kobj { |
176 | struct cpuidle_device *dev; | |
177 | struct completion kobj_unregister; | |
178 | struct kobject kobj; | |
179 | }; | |
180 | ||
181 | static inline struct cpuidle_device *to_cpuidle_device(struct kobject *kobj) | |
182 | { | |
183 | struct cpuidle_device_kobj *kdev = | |
184 | container_of(kobj, struct cpuidle_device_kobj, kobj); | |
185 | ||
186 | return kdev->dev; | |
187 | } | |
188 | ||
f89ae89e DL |
189 | static ssize_t cpuidle_show(struct kobject *kobj, struct attribute *attr, |
190 | char *buf) | |
4f86d3a8 LB |
191 | { |
192 | int ret = -EIO; | |
728ce22b | 193 | struct cpuidle_device *dev = to_cpuidle_device(kobj); |
f89ae89e | 194 | struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr); |
4f86d3a8 LB |
195 | |
196 | if (cattr->show) { | |
197 | mutex_lock(&cpuidle_lock); | |
198 | ret = cattr->show(dev, buf); | |
199 | mutex_unlock(&cpuidle_lock); | |
200 | } | |
201 | return ret; | |
202 | } | |
203 | ||
f89ae89e DL |
204 | static ssize_t cpuidle_store(struct kobject *kobj, struct attribute *attr, |
205 | const char *buf, size_t count) | |
4f86d3a8 LB |
206 | { |
207 | int ret = -EIO; | |
728ce22b | 208 | struct cpuidle_device *dev = to_cpuidle_device(kobj); |
f89ae89e | 209 | struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr); |
4f86d3a8 LB |
210 | |
211 | if (cattr->store) { | |
212 | mutex_lock(&cpuidle_lock); | |
213 | ret = cattr->store(dev, buf, count); | |
214 | mutex_unlock(&cpuidle_lock); | |
215 | } | |
216 | return ret; | |
217 | } | |
218 | ||
52cf25d0 | 219 | static const struct sysfs_ops cpuidle_sysfs_ops = { |
4f86d3a8 LB |
220 | .show = cpuidle_show, |
221 | .store = cpuidle_store, | |
222 | }; | |
223 | ||
224 | static void cpuidle_sysfs_release(struct kobject *kobj) | |
225 | { | |
728ce22b DL |
226 | struct cpuidle_device_kobj *kdev = |
227 | container_of(kobj, struct cpuidle_device_kobj, kobj); | |
4f86d3a8 | 228 | |
728ce22b | 229 | complete(&kdev->kobj_unregister); |
4f86d3a8 LB |
230 | } |
231 | ||
232 | static struct kobj_type ktype_cpuidle = { | |
233 | .sysfs_ops = &cpuidle_sysfs_ops, | |
234 | .release = cpuidle_sysfs_release, | |
235 | }; | |
236 | ||
237 | struct cpuidle_state_attr { | |
238 | struct attribute attr; | |
4202735e DD |
239 | ssize_t (*show)(struct cpuidle_state *, \ |
240 | struct cpuidle_state_usage *, char *); | |
dc7fd275 SL |
241 | ssize_t (*store)(struct cpuidle_state *, \ |
242 | struct cpuidle_state_usage *, const char *, size_t); | |
4f86d3a8 LB |
243 | }; |
244 | ||
245 | #define define_one_state_ro(_name, show) \ | |
246 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL) | |
247 | ||
3a53396b SL |
248 | #define define_one_state_rw(_name, show, store) \ |
249 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store) | |
250 | ||
4f86d3a8 | 251 | #define define_show_state_function(_name) \ |
4202735e DD |
252 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
253 | struct cpuidle_state_usage *state_usage, char *buf) \ | |
4f86d3a8 LB |
254 | { \ |
255 | return sprintf(buf, "%u\n", state->_name);\ | |
256 | } | |
257 | ||
dc7fd275 | 258 | #define define_store_state_ull_function(_name) \ |
3a53396b | 259 | static ssize_t store_state_##_name(struct cpuidle_state *state, \ |
f89ae89e DL |
260 | struct cpuidle_state_usage *state_usage, \ |
261 | const char *buf, size_t size) \ | |
3a53396b | 262 | { \ |
dc7fd275 | 263 | unsigned long long value; \ |
3a53396b SL |
264 | int err; \ |
265 | if (!capable(CAP_SYS_ADMIN)) \ | |
266 | return -EPERM; \ | |
dc7fd275 | 267 | err = kstrtoull(buf, 0, &value); \ |
3a53396b SL |
268 | if (err) \ |
269 | return err; \ | |
270 | if (value) \ | |
dc7fd275 | 271 | state_usage->_name = 1; \ |
3a53396b | 272 | else \ |
dc7fd275 | 273 | state_usage->_name = 0; \ |
3a53396b SL |
274 | return size; \ |
275 | } | |
276 | ||
8b78cf60 | 277 | #define define_show_state_ull_function(_name) \ |
4202735e | 278 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
f89ae89e DL |
279 | struct cpuidle_state_usage *state_usage, \ |
280 | char *buf) \ | |
8b78cf60 | 281 | { \ |
4202735e | 282 | return sprintf(buf, "%llu\n", state_usage->_name);\ |
8b78cf60 YY |
283 | } |
284 | ||
4fcb2fcd | 285 | #define define_show_state_str_function(_name) \ |
4202735e | 286 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
f89ae89e DL |
287 | struct cpuidle_state_usage *state_usage, \ |
288 | char *buf) \ | |
4fcb2fcd VP |
289 | { \ |
290 | if (state->_name[0] == '\0')\ | |
291 | return sprintf(buf, "<null>\n");\ | |
292 | return sprintf(buf, "%s\n", state->_name);\ | |
4f86d3a8 LB |
293 | } |
294 | ||
295 | define_show_state_function(exit_latency) | |
9bc0482f | 296 | define_show_state_function(target_residency) |
4f86d3a8 | 297 | define_show_state_function(power_usage) |
8b78cf60 YY |
298 | define_show_state_ull_function(usage) |
299 | define_show_state_ull_function(time) | |
4fcb2fcd VP |
300 | define_show_state_str_function(name) |
301 | define_show_state_str_function(desc) | |
dc7fd275 SL |
302 | define_show_state_ull_function(disable) |
303 | define_store_state_ull_function(disable) | |
4fcb2fcd | 304 | |
4f86d3a8 | 305 | define_one_state_ro(name, show_state_name); |
4fcb2fcd | 306 | define_one_state_ro(desc, show_state_desc); |
4f86d3a8 | 307 | define_one_state_ro(latency, show_state_exit_latency); |
9bc0482f | 308 | define_one_state_ro(residency, show_state_target_residency); |
4f86d3a8 LB |
309 | define_one_state_ro(power, show_state_power_usage); |
310 | define_one_state_ro(usage, show_state_usage); | |
311 | define_one_state_ro(time, show_state_time); | |
3a53396b | 312 | define_one_state_rw(disable, show_state_disable, store_state_disable); |
4f86d3a8 LB |
313 | |
314 | static struct attribute *cpuidle_state_default_attrs[] = { | |
315 | &attr_name.attr, | |
4fcb2fcd | 316 | &attr_desc.attr, |
4f86d3a8 | 317 | &attr_latency.attr, |
9bc0482f | 318 | &attr_residency.attr, |
4f86d3a8 LB |
319 | &attr_power.attr, |
320 | &attr_usage.attr, | |
321 | &attr_time.attr, | |
3a53396b | 322 | &attr_disable.attr, |
4f86d3a8 LB |
323 | NULL |
324 | }; | |
325 | ||
349631e0 DL |
326 | struct cpuidle_state_kobj { |
327 | struct cpuidle_state *state; | |
328 | struct cpuidle_state_usage *state_usage; | |
329 | struct completion kobj_unregister; | |
330 | struct kobject kobj; | |
331 | }; | |
332 | ||
64bdff69 RW |
333 | #ifdef CONFIG_SUSPEND |
334 | #define define_show_state_s2idle_ull_function(_name) \ | |
335 | static ssize_t show_state_s2idle_##_name(struct cpuidle_state *state, \ | |
336 | struct cpuidle_state_usage *state_usage, \ | |
337 | char *buf) \ | |
338 | { \ | |
339 | return sprintf(buf, "%llu\n", state_usage->s2idle_##_name);\ | |
340 | } | |
341 | ||
342 | define_show_state_s2idle_ull_function(usage); | |
343 | define_show_state_s2idle_ull_function(time); | |
344 | ||
345 | #define define_one_state_s2idle_ro(_name, show) \ | |
346 | static struct cpuidle_state_attr attr_s2idle_##_name = \ | |
347 | __ATTR(_name, 0444, show, NULL) | |
348 | ||
349 | define_one_state_s2idle_ro(usage, show_state_s2idle_usage); | |
350 | define_one_state_s2idle_ro(time, show_state_s2idle_time); | |
351 | ||
352 | static struct attribute *cpuidle_state_s2idle_attrs[] = { | |
353 | &attr_s2idle_usage.attr, | |
354 | &attr_s2idle_time.attr, | |
355 | NULL | |
356 | }; | |
357 | ||
358 | static const struct attribute_group cpuidle_state_s2idle_group = { | |
359 | .name = "s2idle", | |
360 | .attrs = cpuidle_state_s2idle_attrs, | |
361 | }; | |
362 | ||
363 | static void cpuidle_add_s2idle_attr_group(struct cpuidle_state_kobj *kobj) | |
364 | { | |
365 | int ret; | |
366 | ||
367 | if (!kobj->state->enter_s2idle) | |
368 | return; | |
369 | ||
370 | ret = sysfs_create_group(&kobj->kobj, &cpuidle_state_s2idle_group); | |
371 | if (ret) | |
372 | pr_debug("%s: sysfs attribute group not created\n", __func__); | |
373 | } | |
374 | ||
375 | static void cpuidle_remove_s2idle_attr_group(struct cpuidle_state_kobj *kobj) | |
376 | { | |
377 | if (kobj->state->enter_s2idle) | |
378 | sysfs_remove_group(&kobj->kobj, &cpuidle_state_s2idle_group); | |
379 | } | |
380 | #else | |
381 | static inline void cpuidle_add_s2idle_attr_group(struct cpuidle_state_kobj *kobj) { } | |
382 | static inline void cpuidle_remove_s2idle_attr_group(struct cpuidle_state_kobj *kobj) { } | |
383 | #endif /* CONFIG_SUSPEND */ | |
384 | ||
4f86d3a8 LB |
385 | #define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj) |
386 | #define kobj_to_state(k) (kobj_to_state_obj(k)->state) | |
4202735e | 387 | #define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage) |
4f86d3a8 | 388 | #define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr) |
f89ae89e DL |
389 | |
390 | static ssize_t cpuidle_state_show(struct kobject *kobj, struct attribute *attr, | |
391 | char * buf) | |
4f86d3a8 LB |
392 | { |
393 | int ret = -EIO; | |
394 | struct cpuidle_state *state = kobj_to_state(kobj); | |
4202735e | 395 | struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj); |
4f86d3a8 LB |
396 | struct cpuidle_state_attr * cattr = attr_to_stateattr(attr); |
397 | ||
398 | if (cattr->show) | |
4202735e | 399 | ret = cattr->show(state, state_usage, buf); |
4f86d3a8 LB |
400 | |
401 | return ret; | |
402 | } | |
403 | ||
f89ae89e DL |
404 | static ssize_t cpuidle_state_store(struct kobject *kobj, struct attribute *attr, |
405 | const char *buf, size_t size) | |
3a53396b SL |
406 | { |
407 | int ret = -EIO; | |
408 | struct cpuidle_state *state = kobj_to_state(kobj); | |
dc7fd275 | 409 | struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj); |
3a53396b SL |
410 | struct cpuidle_state_attr *cattr = attr_to_stateattr(attr); |
411 | ||
412 | if (cattr->store) | |
dc7fd275 | 413 | ret = cattr->store(state, state_usage, buf, size); |
3a53396b SL |
414 | |
415 | return ret; | |
416 | } | |
417 | ||
52cf25d0 | 418 | static const struct sysfs_ops cpuidle_state_sysfs_ops = { |
4f86d3a8 | 419 | .show = cpuidle_state_show, |
3a53396b | 420 | .store = cpuidle_state_store, |
4f86d3a8 LB |
421 | }; |
422 | ||
423 | static void cpuidle_state_sysfs_release(struct kobject *kobj) | |
424 | { | |
425 | struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj); | |
426 | ||
427 | complete(&state_obj->kobj_unregister); | |
428 | } | |
429 | ||
430 | static struct kobj_type ktype_state_cpuidle = { | |
431 | .sysfs_ops = &cpuidle_state_sysfs_ops, | |
432 | .default_attrs = cpuidle_state_default_attrs, | |
433 | .release = cpuidle_state_sysfs_release, | |
434 | }; | |
435 | ||
42b16b3f | 436 | static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i) |
4f86d3a8 | 437 | { |
64bdff69 | 438 | cpuidle_remove_s2idle_attr_group(device->kobjs[i]); |
c10997f6 | 439 | kobject_put(&device->kobjs[i]->kobj); |
4f86d3a8 LB |
440 | wait_for_completion(&device->kobjs[i]->kobj_unregister); |
441 | kfree(device->kobjs[i]); | |
442 | device->kobjs[i] = NULL; | |
443 | } | |
444 | ||
445 | /** | |
bf4d1b5d | 446 | * cpuidle_add_state_sysfs - adds cpuidle states sysfs attributes |
4f86d3a8 LB |
447 | * @device: the target device |
448 | */ | |
bf4d1b5d | 449 | static int cpuidle_add_state_sysfs(struct cpuidle_device *device) |
4f86d3a8 LB |
450 | { |
451 | int i, ret = -ENOMEM; | |
452 | struct cpuidle_state_kobj *kobj; | |
728ce22b | 453 | struct cpuidle_device_kobj *kdev = device->kobj_dev; |
bf4d1b5d | 454 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device); |
4f86d3a8 LB |
455 | |
456 | /* state statistics */ | |
d75e4af1 | 457 | for (i = 0; i < drv->state_count; i++) { |
4f86d3a8 | 458 | kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL); |
8f6040ce PB |
459 | if (!kobj) { |
460 | ret = -ENOMEM; | |
4f86d3a8 | 461 | goto error_state; |
8f6040ce | 462 | } |
46bcfad7 | 463 | kobj->state = &drv->states[i]; |
4202735e | 464 | kobj->state_usage = &device->states_usage[i]; |
4f86d3a8 LB |
465 | init_completion(&kobj->kobj_unregister); |
466 | ||
e45a00d6 | 467 | ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, |
728ce22b | 468 | &kdev->kobj, "state%d", i); |
4f86d3a8 LB |
469 | if (ret) { |
470 | kfree(kobj); | |
471 | goto error_state; | |
472 | } | |
64bdff69 | 473 | cpuidle_add_s2idle_attr_group(kobj); |
94f57f33 | 474 | kobject_uevent(&kobj->kobj, KOBJ_ADD); |
4f86d3a8 LB |
475 | device->kobjs[i] = kobj; |
476 | } | |
477 | ||
478 | return 0; | |
479 | ||
480 | error_state: | |
481 | for (i = i - 1; i >= 0; i--) | |
482 | cpuidle_free_state_kobj(device, i); | |
483 | return ret; | |
484 | } | |
485 | ||
486 | /** | |
bf4d1b5d | 487 | * cpuidle_remove_driver_sysfs - removes the cpuidle states sysfs attributes |
4f86d3a8 LB |
488 | * @device: the target device |
489 | */ | |
bf4d1b5d | 490 | static void cpuidle_remove_state_sysfs(struct cpuidle_device *device) |
4f86d3a8 | 491 | { |
d75e4af1 | 492 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device); |
4f86d3a8 LB |
493 | int i; |
494 | ||
d75e4af1 | 495 | for (i = 0; i < drv->state_count; i++) |
4f86d3a8 LB |
496 | cpuidle_free_state_kobj(device, i); |
497 | } | |
498 | ||
bf4d1b5d DL |
499 | #ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS |
500 | #define kobj_to_driver_kobj(k) container_of(k, struct cpuidle_driver_kobj, kobj) | |
501 | #define attr_to_driver_attr(a) container_of(a, struct cpuidle_driver_attr, attr) | |
502 | ||
503 | #define define_one_driver_ro(_name, show) \ | |
504 | static struct cpuidle_driver_attr attr_driver_##_name = \ | |
4f8eea9b | 505 | __ATTR(_name, 0444, show, NULL) |
bf4d1b5d DL |
506 | |
507 | struct cpuidle_driver_kobj { | |
508 | struct cpuidle_driver *drv; | |
509 | struct completion kobj_unregister; | |
510 | struct kobject kobj; | |
511 | }; | |
512 | ||
513 | struct cpuidle_driver_attr { | |
514 | struct attribute attr; | |
515 | ssize_t (*show)(struct cpuidle_driver *, char *); | |
516 | ssize_t (*store)(struct cpuidle_driver *, const char *, size_t); | |
517 | }; | |
518 | ||
519 | static ssize_t show_driver_name(struct cpuidle_driver *drv, char *buf) | |
520 | { | |
521 | ssize_t ret; | |
522 | ||
523 | spin_lock(&cpuidle_driver_lock); | |
524 | ret = sprintf(buf, "%s\n", drv ? drv->name : "none"); | |
525 | spin_unlock(&cpuidle_driver_lock); | |
526 | ||
527 | return ret; | |
528 | } | |
529 | ||
530 | static void cpuidle_driver_sysfs_release(struct kobject *kobj) | |
531 | { | |
532 | struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj); | |
533 | complete(&driver_kobj->kobj_unregister); | |
534 | } | |
535 | ||
f89ae89e DL |
536 | static ssize_t cpuidle_driver_show(struct kobject *kobj, struct attribute *attr, |
537 | char *buf) | |
bf4d1b5d DL |
538 | { |
539 | int ret = -EIO; | |
540 | struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj); | |
541 | struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr); | |
542 | ||
543 | if (dattr->show) | |
544 | ret = dattr->show(driver_kobj->drv, buf); | |
545 | ||
546 | return ret; | |
547 | } | |
548 | ||
549 | static ssize_t cpuidle_driver_store(struct kobject *kobj, struct attribute *attr, | |
550 | const char *buf, size_t size) | |
551 | { | |
552 | int ret = -EIO; | |
553 | struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj); | |
554 | struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr); | |
555 | ||
556 | if (dattr->store) | |
557 | ret = dattr->store(driver_kobj->drv, buf, size); | |
558 | ||
559 | return ret; | |
560 | } | |
561 | ||
562 | define_one_driver_ro(name, show_driver_name); | |
563 | ||
564 | static const struct sysfs_ops cpuidle_driver_sysfs_ops = { | |
565 | .show = cpuidle_driver_show, | |
566 | .store = cpuidle_driver_store, | |
567 | }; | |
568 | ||
569 | static struct attribute *cpuidle_driver_default_attrs[] = { | |
570 | &attr_driver_name.attr, | |
571 | NULL | |
572 | }; | |
573 | ||
574 | static struct kobj_type ktype_driver_cpuidle = { | |
575 | .sysfs_ops = &cpuidle_driver_sysfs_ops, | |
576 | .default_attrs = cpuidle_driver_default_attrs, | |
577 | .release = cpuidle_driver_sysfs_release, | |
578 | }; | |
579 | ||
580 | /** | |
581 | * cpuidle_add_driver_sysfs - adds the driver name sysfs attribute | |
582 | * @device: the target device | |
583 | */ | |
584 | static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev) | |
585 | { | |
586 | struct cpuidle_driver_kobj *kdrv; | |
728ce22b | 587 | struct cpuidle_device_kobj *kdev = dev->kobj_dev; |
bf4d1b5d DL |
588 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); |
589 | int ret; | |
590 | ||
591 | kdrv = kzalloc(sizeof(*kdrv), GFP_KERNEL); | |
592 | if (!kdrv) | |
593 | return -ENOMEM; | |
594 | ||
595 | kdrv->drv = drv; | |
596 | init_completion(&kdrv->kobj_unregister); | |
597 | ||
598 | ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle, | |
728ce22b | 599 | &kdev->kobj, "driver"); |
bf4d1b5d DL |
600 | if (ret) { |
601 | kfree(kdrv); | |
602 | return ret; | |
603 | } | |
604 | ||
605 | kobject_uevent(&kdrv->kobj, KOBJ_ADD); | |
606 | dev->kobj_driver = kdrv; | |
607 | ||
608 | return ret; | |
609 | } | |
610 | ||
611 | /** | |
612 | * cpuidle_remove_driver_sysfs - removes the driver name sysfs attribute | |
613 | * @device: the target device | |
614 | */ | |
615 | static void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev) | |
616 | { | |
617 | struct cpuidle_driver_kobj *kdrv = dev->kobj_driver; | |
618 | kobject_put(&kdrv->kobj); | |
619 | wait_for_completion(&kdrv->kobj_unregister); | |
620 | kfree(kdrv); | |
621 | } | |
622 | #else | |
623 | static inline int cpuidle_add_driver_sysfs(struct cpuidle_device *dev) | |
624 | { | |
625 | return 0; | |
626 | } | |
627 | ||
628 | static inline void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev) | |
629 | { | |
630 | ; | |
631 | } | |
632 | #endif | |
633 | ||
634 | /** | |
635 | * cpuidle_add_device_sysfs - adds device specific sysfs attributes | |
636 | * @device: the target device | |
637 | */ | |
638 | int cpuidle_add_device_sysfs(struct cpuidle_device *device) | |
639 | { | |
640 | int ret; | |
641 | ||
642 | ret = cpuidle_add_state_sysfs(device); | |
643 | if (ret) | |
644 | return ret; | |
645 | ||
646 | ret = cpuidle_add_driver_sysfs(device); | |
647 | if (ret) | |
648 | cpuidle_remove_state_sysfs(device); | |
649 | return ret; | |
650 | } | |
651 | ||
652 | /** | |
653 | * cpuidle_remove_device_sysfs : removes device specific sysfs attributes | |
654 | * @device : the target device | |
655 | */ | |
656 | void cpuidle_remove_device_sysfs(struct cpuidle_device *device) | |
657 | { | |
658 | cpuidle_remove_driver_sysfs(device); | |
659 | cpuidle_remove_state_sysfs(device); | |
660 | } | |
661 | ||
4f86d3a8 LB |
662 | /** |
663 | * cpuidle_add_sysfs - creates a sysfs instance for the target device | |
8a25a2fd | 664 | * @dev: the target device |
4f86d3a8 | 665 | */ |
1aef40e2 | 666 | int cpuidle_add_sysfs(struct cpuidle_device *dev) |
4f86d3a8 | 667 | { |
728ce22b | 668 | struct cpuidle_device_kobj *kdev; |
1aef40e2 | 669 | struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu); |
94f57f33 | 670 | int error; |
4f86d3a8 | 671 | |
ad0a45fd VS |
672 | /* |
673 | * Return if cpu_device is not setup for this CPU. | |
674 | * | |
675 | * This could happen if the arch did not set up cpu_device | |
676 | * since this CPU is not in cpu_present mask and the | |
677 | * driver did not send a correct CPU mask during registration. | |
678 | * Without this check we would end up passing bogus | |
679 | * value for &cpu_dev->kobj in kobject_init_and_add() | |
680 | */ | |
681 | if (!cpu_dev) | |
682 | return -ENODEV; | |
683 | ||
728ce22b DL |
684 | kdev = kzalloc(sizeof(*kdev), GFP_KERNEL); |
685 | if (!kdev) | |
686 | return -ENOMEM; | |
687 | kdev->dev = dev; | |
688 | dev->kobj_dev = kdev; | |
689 | ||
690 | init_completion(&kdev->kobj_unregister); | |
691 | ||
692 | error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj, | |
693 | "cpuidle"); | |
694 | if (error) { | |
695 | kfree(kdev); | |
696 | return error; | |
697 | } | |
e45a00d6 | 698 | |
728ce22b DL |
699 | kobject_uevent(&kdev->kobj, KOBJ_ADD); |
700 | ||
701 | return 0; | |
4f86d3a8 LB |
702 | } |
703 | ||
704 | /** | |
705 | * cpuidle_remove_sysfs - deletes a sysfs instance on the target device | |
8a25a2fd | 706 | * @dev: the target device |
4f86d3a8 | 707 | */ |
1aef40e2 | 708 | void cpuidle_remove_sysfs(struct cpuidle_device *dev) |
4f86d3a8 | 709 | { |
728ce22b DL |
710 | struct cpuidle_device_kobj *kdev = dev->kobj_dev; |
711 | ||
712 | kobject_put(&kdev->kobj); | |
713 | wait_for_completion(&kdev->kobj_unregister); | |
714 | kfree(kdev); | |
4f86d3a8 | 715 | } |