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Commit | Line | Data |
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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> |
3a53396b | 14 | #include <linux/capability.h> |
4f86d3a8 LB |
15 | |
16 | #include "cpuidle.h" | |
17 | ||
18 | static unsigned int sysfs_switch; | |
19 | static int __init cpuidle_sysfs_setup(char *unused) | |
20 | { | |
21 | sysfs_switch = 1; | |
22 | return 1; | |
23 | } | |
24 | __setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup); | |
25 | ||
8a25a2fd KS |
26 | static ssize_t show_available_governors(struct device *dev, |
27 | struct device_attribute *attr, | |
66198f36 | 28 | char *buf) |
4f86d3a8 LB |
29 | { |
30 | ssize_t i = 0; | |
31 | struct cpuidle_governor *tmp; | |
32 | ||
33 | mutex_lock(&cpuidle_lock); | |
34 | list_for_each_entry(tmp, &cpuidle_governors, governor_list) { | |
35 | if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - CPUIDLE_NAME_LEN - 2)) | |
36 | goto out; | |
37 | i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name); | |
38 | } | |
39 | ||
40 | out: | |
41 | i+= sprintf(&buf[i], "\n"); | |
42 | mutex_unlock(&cpuidle_lock); | |
43 | return i; | |
44 | } | |
45 | ||
8a25a2fd KS |
46 | static ssize_t show_current_driver(struct device *dev, |
47 | struct device_attribute *attr, | |
66198f36 | 48 | char *buf) |
4f86d3a8 LB |
49 | { |
50 | ssize_t ret; | |
752138df | 51 | struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver(); |
4f86d3a8 LB |
52 | |
53 | spin_lock(&cpuidle_driver_lock); | |
752138df LB |
54 | if (cpuidle_driver) |
55 | ret = sprintf(buf, "%s\n", cpuidle_driver->name); | |
4f86d3a8 LB |
56 | else |
57 | ret = sprintf(buf, "none\n"); | |
58 | spin_unlock(&cpuidle_driver_lock); | |
59 | ||
60 | return ret; | |
61 | } | |
62 | ||
8a25a2fd KS |
63 | static ssize_t show_current_governor(struct device *dev, |
64 | struct device_attribute *attr, | |
66198f36 | 65 | char *buf) |
4f86d3a8 LB |
66 | { |
67 | ssize_t ret; | |
68 | ||
69 | mutex_lock(&cpuidle_lock); | |
70 | if (cpuidle_curr_governor) | |
71 | ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name); | |
72 | else | |
73 | ret = sprintf(buf, "none\n"); | |
74 | mutex_unlock(&cpuidle_lock); | |
75 | ||
76 | return ret; | |
77 | } | |
78 | ||
8a25a2fd KS |
79 | static ssize_t store_current_governor(struct device *dev, |
80 | struct device_attribute *attr, | |
66198f36 | 81 | const char *buf, size_t count) |
4f86d3a8 LB |
82 | { |
83 | char gov_name[CPUIDLE_NAME_LEN]; | |
84 | int ret = -EINVAL; | |
85 | size_t len = count; | |
86 | struct cpuidle_governor *gov; | |
87 | ||
88 | if (!len || len >= sizeof(gov_name)) | |
89 | return -EINVAL; | |
90 | ||
91 | memcpy(gov_name, buf, len); | |
92 | gov_name[len] = '\0'; | |
93 | if (gov_name[len - 1] == '\n') | |
94 | gov_name[--len] = '\0'; | |
95 | ||
96 | mutex_lock(&cpuidle_lock); | |
97 | ||
98 | list_for_each_entry(gov, &cpuidle_governors, governor_list) { | |
99 | if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) { | |
100 | ret = cpuidle_switch_governor(gov); | |
101 | break; | |
102 | } | |
103 | } | |
104 | ||
105 | mutex_unlock(&cpuidle_lock); | |
106 | ||
107 | if (ret) | |
108 | return ret; | |
109 | else | |
110 | return count; | |
111 | } | |
112 | ||
8a25a2fd KS |
113 | static DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL); |
114 | static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL); | |
4f86d3a8 | 115 | |
8a25a2fd KS |
116 | static struct attribute *cpuidle_default_attrs[] = { |
117 | &dev_attr_current_driver.attr, | |
118 | &dev_attr_current_governor_ro.attr, | |
4f86d3a8 LB |
119 | NULL |
120 | }; | |
121 | ||
8a25a2fd KS |
122 | static DEVICE_ATTR(available_governors, 0444, show_available_governors, NULL); |
123 | static DEVICE_ATTR(current_governor, 0644, show_current_governor, | |
124 | store_current_governor); | |
4f86d3a8 | 125 | |
8a25a2fd KS |
126 | static struct attribute *cpuidle_switch_attrs[] = { |
127 | &dev_attr_available_governors.attr, | |
128 | &dev_attr_current_driver.attr, | |
129 | &dev_attr_current_governor.attr, | |
4f86d3a8 LB |
130 | NULL |
131 | }; | |
132 | ||
8a25a2fd KS |
133 | static struct attribute_group cpuidle_attr_group = { |
134 | .attrs = cpuidle_default_attrs, | |
4f86d3a8 LB |
135 | .name = "cpuidle", |
136 | }; | |
137 | ||
138 | /** | |
8a25a2fd | 139 | * cpuidle_add_interface - add CPU global sysfs attributes |
4f86d3a8 | 140 | */ |
8a25a2fd | 141 | int cpuidle_add_interface(struct device *dev) |
4f86d3a8 LB |
142 | { |
143 | if (sysfs_switch) | |
8a25a2fd | 144 | cpuidle_attr_group.attrs = cpuidle_switch_attrs; |
4f86d3a8 | 145 | |
8a25a2fd | 146 | return sysfs_create_group(&dev->kobj, &cpuidle_attr_group); |
4f86d3a8 LB |
147 | } |
148 | ||
149 | /** | |
8a25a2fd | 150 | * cpuidle_remove_interface - remove CPU global sysfs attributes |
4f86d3a8 | 151 | */ |
8a25a2fd | 152 | void cpuidle_remove_interface(struct device *dev) |
4f86d3a8 | 153 | { |
8a25a2fd | 154 | sysfs_remove_group(&dev->kobj, &cpuidle_attr_group); |
4f86d3a8 LB |
155 | } |
156 | ||
157 | struct cpuidle_attr { | |
158 | struct attribute attr; | |
159 | ssize_t (*show)(struct cpuidle_device *, char *); | |
160 | ssize_t (*store)(struct cpuidle_device *, const char *, size_t count); | |
161 | }; | |
162 | ||
163 | #define define_one_ro(_name, show) \ | |
164 | static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL) | |
165 | #define define_one_rw(_name, show, store) \ | |
166 | static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store) | |
167 | ||
168 | #define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj) | |
169 | #define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr) | |
170 | static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf) | |
171 | { | |
172 | int ret = -EIO; | |
173 | struct cpuidle_device *dev = kobj_to_cpuidledev(kobj); | |
174 | struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr); | |
175 | ||
176 | if (cattr->show) { | |
177 | mutex_lock(&cpuidle_lock); | |
178 | ret = cattr->show(dev, buf); | |
179 | mutex_unlock(&cpuidle_lock); | |
180 | } | |
181 | return ret; | |
182 | } | |
183 | ||
184 | static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr, | |
185 | const char * buf, size_t count) | |
186 | { | |
187 | int ret = -EIO; | |
188 | struct cpuidle_device *dev = kobj_to_cpuidledev(kobj); | |
189 | struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr); | |
190 | ||
191 | if (cattr->store) { | |
192 | mutex_lock(&cpuidle_lock); | |
193 | ret = cattr->store(dev, buf, count); | |
194 | mutex_unlock(&cpuidle_lock); | |
195 | } | |
196 | return ret; | |
197 | } | |
198 | ||
52cf25d0 | 199 | static const struct sysfs_ops cpuidle_sysfs_ops = { |
4f86d3a8 LB |
200 | .show = cpuidle_show, |
201 | .store = cpuidle_store, | |
202 | }; | |
203 | ||
204 | static void cpuidle_sysfs_release(struct kobject *kobj) | |
205 | { | |
206 | struct cpuidle_device *dev = kobj_to_cpuidledev(kobj); | |
207 | ||
208 | complete(&dev->kobj_unregister); | |
209 | } | |
210 | ||
211 | static struct kobj_type ktype_cpuidle = { | |
212 | .sysfs_ops = &cpuidle_sysfs_ops, | |
213 | .release = cpuidle_sysfs_release, | |
214 | }; | |
215 | ||
216 | struct cpuidle_state_attr { | |
217 | struct attribute attr; | |
4202735e DD |
218 | ssize_t (*show)(struct cpuidle_state *, \ |
219 | struct cpuidle_state_usage *, char *); | |
4f86d3a8 LB |
220 | ssize_t (*store)(struct cpuidle_state *, const char *, size_t); |
221 | }; | |
222 | ||
223 | #define define_one_state_ro(_name, show) \ | |
224 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL) | |
225 | ||
3a53396b SL |
226 | #define define_one_state_rw(_name, show, store) \ |
227 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store) | |
228 | ||
4f86d3a8 | 229 | #define define_show_state_function(_name) \ |
4202735e DD |
230 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
231 | struct cpuidle_state_usage *state_usage, char *buf) \ | |
4f86d3a8 LB |
232 | { \ |
233 | return sprintf(buf, "%u\n", state->_name);\ | |
234 | } | |
235 | ||
3a53396b SL |
236 | #define define_store_state_function(_name) \ |
237 | static ssize_t store_state_##_name(struct cpuidle_state *state, \ | |
238 | const char *buf, size_t size) \ | |
239 | { \ | |
240 | long value; \ | |
241 | int err; \ | |
242 | if (!capable(CAP_SYS_ADMIN)) \ | |
243 | return -EPERM; \ | |
244 | err = kstrtol(buf, 0, &value); \ | |
245 | if (err) \ | |
246 | return err; \ | |
247 | if (value) \ | |
248 | state->disable = 1; \ | |
249 | else \ | |
250 | state->disable = 0; \ | |
251 | return size; \ | |
252 | } | |
253 | ||
8b78cf60 | 254 | #define define_show_state_ull_function(_name) \ |
4202735e DD |
255 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
256 | struct cpuidle_state_usage *state_usage, char *buf) \ | |
8b78cf60 | 257 | { \ |
4202735e | 258 | return sprintf(buf, "%llu\n", state_usage->_name);\ |
8b78cf60 YY |
259 | } |
260 | ||
4fcb2fcd | 261 | #define define_show_state_str_function(_name) \ |
4202735e DD |
262 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
263 | struct cpuidle_state_usage *state_usage, char *buf) \ | |
4fcb2fcd VP |
264 | { \ |
265 | if (state->_name[0] == '\0')\ | |
266 | return sprintf(buf, "<null>\n");\ | |
267 | return sprintf(buf, "%s\n", state->_name);\ | |
4f86d3a8 LB |
268 | } |
269 | ||
270 | define_show_state_function(exit_latency) | |
271 | define_show_state_function(power_usage) | |
8b78cf60 YY |
272 | define_show_state_ull_function(usage) |
273 | define_show_state_ull_function(time) | |
4fcb2fcd VP |
274 | define_show_state_str_function(name) |
275 | define_show_state_str_function(desc) | |
3a53396b SL |
276 | define_show_state_function(disable) |
277 | define_store_state_function(disable) | |
4fcb2fcd | 278 | |
4f86d3a8 | 279 | define_one_state_ro(name, show_state_name); |
4fcb2fcd | 280 | define_one_state_ro(desc, show_state_desc); |
4f86d3a8 LB |
281 | define_one_state_ro(latency, show_state_exit_latency); |
282 | define_one_state_ro(power, show_state_power_usage); | |
283 | define_one_state_ro(usage, show_state_usage); | |
284 | define_one_state_ro(time, show_state_time); | |
3a53396b | 285 | define_one_state_rw(disable, show_state_disable, store_state_disable); |
4f86d3a8 LB |
286 | |
287 | static struct attribute *cpuidle_state_default_attrs[] = { | |
288 | &attr_name.attr, | |
4fcb2fcd | 289 | &attr_desc.attr, |
4f86d3a8 LB |
290 | &attr_latency.attr, |
291 | &attr_power.attr, | |
292 | &attr_usage.attr, | |
293 | &attr_time.attr, | |
3a53396b | 294 | &attr_disable.attr, |
4f86d3a8 LB |
295 | NULL |
296 | }; | |
297 | ||
298 | #define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj) | |
299 | #define kobj_to_state(k) (kobj_to_state_obj(k)->state) | |
4202735e | 300 | #define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage) |
4f86d3a8 LB |
301 | #define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr) |
302 | static ssize_t cpuidle_state_show(struct kobject * kobj, | |
303 | struct attribute * attr ,char * buf) | |
304 | { | |
305 | int ret = -EIO; | |
306 | struct cpuidle_state *state = kobj_to_state(kobj); | |
4202735e | 307 | struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj); |
4f86d3a8 LB |
308 | struct cpuidle_state_attr * cattr = attr_to_stateattr(attr); |
309 | ||
310 | if (cattr->show) | |
4202735e | 311 | ret = cattr->show(state, state_usage, buf); |
4f86d3a8 LB |
312 | |
313 | return ret; | |
314 | } | |
315 | ||
3a53396b SL |
316 | static ssize_t cpuidle_state_store(struct kobject *kobj, |
317 | struct attribute *attr, const char *buf, size_t size) | |
318 | { | |
319 | int ret = -EIO; | |
320 | struct cpuidle_state *state = kobj_to_state(kobj); | |
321 | struct cpuidle_state_attr *cattr = attr_to_stateattr(attr); | |
322 | ||
323 | if (cattr->store) | |
324 | ret = cattr->store(state, buf, size); | |
325 | ||
326 | return ret; | |
327 | } | |
328 | ||
52cf25d0 | 329 | static const struct sysfs_ops cpuidle_state_sysfs_ops = { |
4f86d3a8 | 330 | .show = cpuidle_state_show, |
3a53396b | 331 | .store = cpuidle_state_store, |
4f86d3a8 LB |
332 | }; |
333 | ||
334 | static void cpuidle_state_sysfs_release(struct kobject *kobj) | |
335 | { | |
336 | struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj); | |
337 | ||
338 | complete(&state_obj->kobj_unregister); | |
339 | } | |
340 | ||
341 | static struct kobj_type ktype_state_cpuidle = { | |
342 | .sysfs_ops = &cpuidle_state_sysfs_ops, | |
343 | .default_attrs = cpuidle_state_default_attrs, | |
344 | .release = cpuidle_state_sysfs_release, | |
345 | }; | |
346 | ||
42b16b3f | 347 | static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i) |
4f86d3a8 | 348 | { |
c10997f6 | 349 | kobject_put(&device->kobjs[i]->kobj); |
4f86d3a8 LB |
350 | wait_for_completion(&device->kobjs[i]->kobj_unregister); |
351 | kfree(device->kobjs[i]); | |
352 | device->kobjs[i] = NULL; | |
353 | } | |
354 | ||
355 | /** | |
356 | * cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes | |
357 | * @device: the target device | |
358 | */ | |
359 | int cpuidle_add_state_sysfs(struct cpuidle_device *device) | |
360 | { | |
361 | int i, ret = -ENOMEM; | |
362 | struct cpuidle_state_kobj *kobj; | |
46bcfad7 | 363 | struct cpuidle_driver *drv = cpuidle_get_driver(); |
4f86d3a8 LB |
364 | |
365 | /* state statistics */ | |
366 | for (i = 0; i < device->state_count; i++) { | |
367 | kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL); | |
368 | if (!kobj) | |
369 | goto error_state; | |
46bcfad7 | 370 | kobj->state = &drv->states[i]; |
4202735e | 371 | kobj->state_usage = &device->states_usage[i]; |
4f86d3a8 LB |
372 | init_completion(&kobj->kobj_unregister); |
373 | ||
94f57f33 GKH |
374 | ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, &device->kobj, |
375 | "state%d", i); | |
4f86d3a8 LB |
376 | if (ret) { |
377 | kfree(kobj); | |
378 | goto error_state; | |
379 | } | |
94f57f33 | 380 | kobject_uevent(&kobj->kobj, KOBJ_ADD); |
4f86d3a8 LB |
381 | device->kobjs[i] = kobj; |
382 | } | |
383 | ||
384 | return 0; | |
385 | ||
386 | error_state: | |
387 | for (i = i - 1; i >= 0; i--) | |
388 | cpuidle_free_state_kobj(device, i); | |
389 | return ret; | |
390 | } | |
391 | ||
392 | /** | |
393 | * cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes | |
394 | * @device: the target device | |
395 | */ | |
396 | void cpuidle_remove_state_sysfs(struct cpuidle_device *device) | |
397 | { | |
398 | int i; | |
399 | ||
400 | for (i = 0; i < device->state_count; i++) | |
401 | cpuidle_free_state_kobj(device, i); | |
402 | } | |
403 | ||
404 | /** | |
405 | * cpuidle_add_sysfs - creates a sysfs instance for the target device | |
8a25a2fd | 406 | * @dev: the target device |
4f86d3a8 | 407 | */ |
8a25a2fd | 408 | int cpuidle_add_sysfs(struct device *cpu_dev) |
4f86d3a8 | 409 | { |
8a25a2fd | 410 | int cpu = cpu_dev->id; |
4f86d3a8 | 411 | struct cpuidle_device *dev; |
94f57f33 | 412 | int error; |
4f86d3a8 LB |
413 | |
414 | dev = per_cpu(cpuidle_devices, cpu); | |
8a25a2fd | 415 | error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &cpu_dev->kobj, |
94f57f33 GKH |
416 | "cpuidle"); |
417 | if (!error) | |
418 | kobject_uevent(&dev->kobj, KOBJ_ADD); | |
419 | return error; | |
4f86d3a8 LB |
420 | } |
421 | ||
422 | /** | |
423 | * cpuidle_remove_sysfs - deletes a sysfs instance on the target device | |
8a25a2fd | 424 | * @dev: the target device |
4f86d3a8 | 425 | */ |
8a25a2fd | 426 | void cpuidle_remove_sysfs(struct device *cpu_dev) |
4f86d3a8 | 427 | { |
8a25a2fd | 428 | int cpu = cpu_dev->id; |
4f86d3a8 LB |
429 | struct cpuidle_device *dev; |
430 | ||
431 | dev = per_cpu(cpuidle_devices, cpu); | |
c10997f6 | 432 | kobject_put(&dev->kobj); |
4f86d3a8 | 433 | } |