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> | |
12 | #include <linux/cpu.h> | |
13 | ||
14 | #include "cpuidle.h" | |
15 | ||
16 | static unsigned int sysfs_switch; | |
17 | static int __init cpuidle_sysfs_setup(char *unused) | |
18 | { | |
19 | sysfs_switch = 1; | |
20 | return 1; | |
21 | } | |
22 | __setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup); | |
23 | ||
66198f36 RV |
24 | static ssize_t show_available_governors(struct sysdev_class *class, |
25 | char *buf) | |
4f86d3a8 LB |
26 | { |
27 | ssize_t i = 0; | |
28 | struct cpuidle_governor *tmp; | |
29 | ||
30 | mutex_lock(&cpuidle_lock); | |
31 | list_for_each_entry(tmp, &cpuidle_governors, governor_list) { | |
32 | if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - CPUIDLE_NAME_LEN - 2)) | |
33 | goto out; | |
34 | i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name); | |
35 | } | |
36 | ||
37 | out: | |
38 | i+= sprintf(&buf[i], "\n"); | |
39 | mutex_unlock(&cpuidle_lock); | |
40 | return i; | |
41 | } | |
42 | ||
66198f36 RV |
43 | static ssize_t show_current_driver(struct sysdev_class *class, |
44 | char *buf) | |
4f86d3a8 LB |
45 | { |
46 | ssize_t ret; | |
47 | ||
48 | spin_lock(&cpuidle_driver_lock); | |
49 | if (cpuidle_curr_driver) | |
50 | ret = sprintf(buf, "%s\n", cpuidle_curr_driver->name); | |
51 | else | |
52 | ret = sprintf(buf, "none\n"); | |
53 | spin_unlock(&cpuidle_driver_lock); | |
54 | ||
55 | return ret; | |
56 | } | |
57 | ||
66198f36 RV |
58 | static ssize_t show_current_governor(struct sysdev_class *class, |
59 | char *buf) | |
4f86d3a8 LB |
60 | { |
61 | ssize_t ret; | |
62 | ||
63 | mutex_lock(&cpuidle_lock); | |
64 | if (cpuidle_curr_governor) | |
65 | ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name); | |
66 | else | |
67 | ret = sprintf(buf, "none\n"); | |
68 | mutex_unlock(&cpuidle_lock); | |
69 | ||
70 | return ret; | |
71 | } | |
72 | ||
66198f36 RV |
73 | static ssize_t store_current_governor(struct sysdev_class *class, |
74 | const char *buf, size_t count) | |
4f86d3a8 LB |
75 | { |
76 | char gov_name[CPUIDLE_NAME_LEN]; | |
77 | int ret = -EINVAL; | |
78 | size_t len = count; | |
79 | struct cpuidle_governor *gov; | |
80 | ||
81 | if (!len || len >= sizeof(gov_name)) | |
82 | return -EINVAL; | |
83 | ||
84 | memcpy(gov_name, buf, len); | |
85 | gov_name[len] = '\0'; | |
86 | if (gov_name[len - 1] == '\n') | |
87 | gov_name[--len] = '\0'; | |
88 | ||
89 | mutex_lock(&cpuidle_lock); | |
90 | ||
91 | list_for_each_entry(gov, &cpuidle_governors, governor_list) { | |
92 | if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) { | |
93 | ret = cpuidle_switch_governor(gov); | |
94 | break; | |
95 | } | |
96 | } | |
97 | ||
98 | mutex_unlock(&cpuidle_lock); | |
99 | ||
100 | if (ret) | |
101 | return ret; | |
102 | else | |
103 | return count; | |
104 | } | |
105 | ||
66198f36 RV |
106 | static SYSDEV_CLASS_ATTR(current_driver, 0444, show_current_driver, NULL); |
107 | static SYSDEV_CLASS_ATTR(current_governor_ro, 0444, show_current_governor, | |
108 | NULL); | |
4f86d3a8 LB |
109 | |
110 | static struct attribute *cpuclass_default_attrs[] = { | |
111 | &attr_current_driver.attr, | |
112 | &attr_current_governor_ro.attr, | |
113 | NULL | |
114 | }; | |
115 | ||
66198f36 RV |
116 | static SYSDEV_CLASS_ATTR(available_governors, 0444, show_available_governors, |
117 | NULL); | |
118 | static SYSDEV_CLASS_ATTR(current_governor, 0644, show_current_governor, | |
119 | store_current_governor); | |
4f86d3a8 LB |
120 | |
121 | static struct attribute *cpuclass_switch_attrs[] = { | |
122 | &attr_available_governors.attr, | |
123 | &attr_current_driver.attr, | |
124 | &attr_current_governor.attr, | |
125 | NULL | |
126 | }; | |
127 | ||
128 | static struct attribute_group cpuclass_attr_group = { | |
129 | .attrs = cpuclass_default_attrs, | |
130 | .name = "cpuidle", | |
131 | }; | |
132 | ||
133 | /** | |
134 | * cpuidle_add_class_sysfs - add CPU global sysfs attributes | |
135 | */ | |
136 | int cpuidle_add_class_sysfs(struct sysdev_class *cls) | |
137 | { | |
138 | if (sysfs_switch) | |
139 | cpuclass_attr_group.attrs = cpuclass_switch_attrs; | |
140 | ||
141 | return sysfs_create_group(&cls->kset.kobj, &cpuclass_attr_group); | |
142 | } | |
143 | ||
144 | /** | |
145 | * cpuidle_remove_class_sysfs - remove CPU global sysfs attributes | |
146 | */ | |
147 | void cpuidle_remove_class_sysfs(struct sysdev_class *cls) | |
148 | { | |
149 | sysfs_remove_group(&cls->kset.kobj, &cpuclass_attr_group); | |
150 | } | |
151 | ||
152 | struct cpuidle_attr { | |
153 | struct attribute attr; | |
154 | ssize_t (*show)(struct cpuidle_device *, char *); | |
155 | ssize_t (*store)(struct cpuidle_device *, const char *, size_t count); | |
156 | }; | |
157 | ||
158 | #define define_one_ro(_name, show) \ | |
159 | static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL) | |
160 | #define define_one_rw(_name, show, store) \ | |
161 | static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store) | |
162 | ||
163 | #define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj) | |
164 | #define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr) | |
165 | static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf) | |
166 | { | |
167 | int ret = -EIO; | |
168 | struct cpuidle_device *dev = kobj_to_cpuidledev(kobj); | |
169 | struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr); | |
170 | ||
171 | if (cattr->show) { | |
172 | mutex_lock(&cpuidle_lock); | |
173 | ret = cattr->show(dev, buf); | |
174 | mutex_unlock(&cpuidle_lock); | |
175 | } | |
176 | return ret; | |
177 | } | |
178 | ||
179 | static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr, | |
180 | const char * buf, size_t count) | |
181 | { | |
182 | int ret = -EIO; | |
183 | struct cpuidle_device *dev = kobj_to_cpuidledev(kobj); | |
184 | struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr); | |
185 | ||
186 | if (cattr->store) { | |
187 | mutex_lock(&cpuidle_lock); | |
188 | ret = cattr->store(dev, buf, count); | |
189 | mutex_unlock(&cpuidle_lock); | |
190 | } | |
191 | return ret; | |
192 | } | |
193 | ||
194 | static struct sysfs_ops cpuidle_sysfs_ops = { | |
195 | .show = cpuidle_show, | |
196 | .store = cpuidle_store, | |
197 | }; | |
198 | ||
199 | static void cpuidle_sysfs_release(struct kobject *kobj) | |
200 | { | |
201 | struct cpuidle_device *dev = kobj_to_cpuidledev(kobj); | |
202 | ||
203 | complete(&dev->kobj_unregister); | |
204 | } | |
205 | ||
206 | static struct kobj_type ktype_cpuidle = { | |
207 | .sysfs_ops = &cpuidle_sysfs_ops, | |
208 | .release = cpuidle_sysfs_release, | |
209 | }; | |
210 | ||
211 | struct cpuidle_state_attr { | |
212 | struct attribute attr; | |
213 | ssize_t (*show)(struct cpuidle_state *, char *); | |
214 | ssize_t (*store)(struct cpuidle_state *, const char *, size_t); | |
215 | }; | |
216 | ||
217 | #define define_one_state_ro(_name, show) \ | |
218 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL) | |
219 | ||
220 | #define define_show_state_function(_name) \ | |
221 | static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \ | |
222 | { \ | |
223 | return sprintf(buf, "%u\n", state->_name);\ | |
224 | } | |
225 | ||
8b78cf60 YY |
226 | #define define_show_state_ull_function(_name) \ |
227 | static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \ | |
228 | { \ | |
229 | return sprintf(buf, "%llu\n", state->_name);\ | |
230 | } | |
231 | ||
4fcb2fcd VP |
232 | #define define_show_state_str_function(_name) \ |
233 | static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \ | |
234 | { \ | |
235 | if (state->_name[0] == '\0')\ | |
236 | return sprintf(buf, "<null>\n");\ | |
237 | return sprintf(buf, "%s\n", state->_name);\ | |
4f86d3a8 LB |
238 | } |
239 | ||
240 | define_show_state_function(exit_latency) | |
241 | define_show_state_function(power_usage) | |
8b78cf60 YY |
242 | define_show_state_ull_function(usage) |
243 | define_show_state_ull_function(time) | |
4fcb2fcd VP |
244 | define_show_state_str_function(name) |
245 | define_show_state_str_function(desc) | |
246 | ||
4f86d3a8 | 247 | define_one_state_ro(name, show_state_name); |
4fcb2fcd | 248 | define_one_state_ro(desc, show_state_desc); |
4f86d3a8 LB |
249 | define_one_state_ro(latency, show_state_exit_latency); |
250 | define_one_state_ro(power, show_state_power_usage); | |
251 | define_one_state_ro(usage, show_state_usage); | |
252 | define_one_state_ro(time, show_state_time); | |
253 | ||
254 | static struct attribute *cpuidle_state_default_attrs[] = { | |
255 | &attr_name.attr, | |
4fcb2fcd | 256 | &attr_desc.attr, |
4f86d3a8 LB |
257 | &attr_latency.attr, |
258 | &attr_power.attr, | |
259 | &attr_usage.attr, | |
260 | &attr_time.attr, | |
261 | NULL | |
262 | }; | |
263 | ||
264 | #define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj) | |
265 | #define kobj_to_state(k) (kobj_to_state_obj(k)->state) | |
266 | #define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr) | |
267 | static ssize_t cpuidle_state_show(struct kobject * kobj, | |
268 | struct attribute * attr ,char * buf) | |
269 | { | |
270 | int ret = -EIO; | |
271 | struct cpuidle_state *state = kobj_to_state(kobj); | |
272 | struct cpuidle_state_attr * cattr = attr_to_stateattr(attr); | |
273 | ||
274 | if (cattr->show) | |
275 | ret = cattr->show(state, buf); | |
276 | ||
277 | return ret; | |
278 | } | |
279 | ||
280 | static struct sysfs_ops cpuidle_state_sysfs_ops = { | |
281 | .show = cpuidle_state_show, | |
282 | }; | |
283 | ||
284 | static void cpuidle_state_sysfs_release(struct kobject *kobj) | |
285 | { | |
286 | struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj); | |
287 | ||
288 | complete(&state_obj->kobj_unregister); | |
289 | } | |
290 | ||
291 | static struct kobj_type ktype_state_cpuidle = { | |
292 | .sysfs_ops = &cpuidle_state_sysfs_ops, | |
293 | .default_attrs = cpuidle_state_default_attrs, | |
294 | .release = cpuidle_state_sysfs_release, | |
295 | }; | |
296 | ||
297 | static void inline cpuidle_free_state_kobj(struct cpuidle_device *device, int i) | |
298 | { | |
c10997f6 | 299 | kobject_put(&device->kobjs[i]->kobj); |
4f86d3a8 LB |
300 | wait_for_completion(&device->kobjs[i]->kobj_unregister); |
301 | kfree(device->kobjs[i]); | |
302 | device->kobjs[i] = NULL; | |
303 | } | |
304 | ||
305 | /** | |
306 | * cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes | |
307 | * @device: the target device | |
308 | */ | |
309 | int cpuidle_add_state_sysfs(struct cpuidle_device *device) | |
310 | { | |
311 | int i, ret = -ENOMEM; | |
312 | struct cpuidle_state_kobj *kobj; | |
313 | ||
314 | /* state statistics */ | |
315 | for (i = 0; i < device->state_count; i++) { | |
316 | kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL); | |
317 | if (!kobj) | |
318 | goto error_state; | |
319 | kobj->state = &device->states[i]; | |
320 | init_completion(&kobj->kobj_unregister); | |
321 | ||
94f57f33 GKH |
322 | ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, &device->kobj, |
323 | "state%d", i); | |
4f86d3a8 LB |
324 | if (ret) { |
325 | kfree(kobj); | |
326 | goto error_state; | |
327 | } | |
94f57f33 | 328 | kobject_uevent(&kobj->kobj, KOBJ_ADD); |
4f86d3a8 LB |
329 | device->kobjs[i] = kobj; |
330 | } | |
331 | ||
332 | return 0; | |
333 | ||
334 | error_state: | |
335 | for (i = i - 1; i >= 0; i--) | |
336 | cpuidle_free_state_kobj(device, i); | |
337 | return ret; | |
338 | } | |
339 | ||
340 | /** | |
341 | * cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes | |
342 | * @device: the target device | |
343 | */ | |
344 | void cpuidle_remove_state_sysfs(struct cpuidle_device *device) | |
345 | { | |
346 | int i; | |
347 | ||
348 | for (i = 0; i < device->state_count; i++) | |
349 | cpuidle_free_state_kobj(device, i); | |
350 | } | |
351 | ||
352 | /** | |
353 | * cpuidle_add_sysfs - creates a sysfs instance for the target device | |
354 | * @sysdev: the target device | |
355 | */ | |
356 | int cpuidle_add_sysfs(struct sys_device *sysdev) | |
357 | { | |
358 | int cpu = sysdev->id; | |
359 | struct cpuidle_device *dev; | |
94f57f33 | 360 | int error; |
4f86d3a8 LB |
361 | |
362 | dev = per_cpu(cpuidle_devices, cpu); | |
94f57f33 GKH |
363 | error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &sysdev->kobj, |
364 | "cpuidle"); | |
365 | if (!error) | |
366 | kobject_uevent(&dev->kobj, KOBJ_ADD); | |
367 | return error; | |
4f86d3a8 LB |
368 | } |
369 | ||
370 | /** | |
371 | * cpuidle_remove_sysfs - deletes a sysfs instance on the target device | |
372 | * @sysdev: the target device | |
373 | */ | |
374 | void cpuidle_remove_sysfs(struct sys_device *sysdev) | |
375 | { | |
376 | int cpu = sysdev->id; | |
377 | struct cpuidle_device *dev; | |
378 | ||
379 | dev = per_cpu(cpuidle_devices, cpu); | |
c10997f6 | 380 | kobject_put(&dev->kobj); |
4f86d3a8 | 381 | } |