audit: complex interfield comparison helper
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / cpuidle / sysfs.c
blob3fe41fe4851a62019e61d1fca88edc464236790e
1 /*
2 * sysfs.c - sysfs support
4 * (C) 2006-2007 Shaohua Li <shaohua.li@intel.com>
6 * This code is licenced under the GPL.
7 */
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>
15 #include "cpuidle.h"
17 static unsigned int sysfs_switch;
18 static int __init cpuidle_sysfs_setup(char *unused)
20 sysfs_switch = 1;
21 return 1;
23 __setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup);
25 static ssize_t show_available_governors(struct device *dev,
26 struct device_attribute *attr,
27 char *buf)
29 ssize_t i = 0;
30 struct cpuidle_governor *tmp;
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);
39 out:
40 i+= sprintf(&buf[i], "\n");
41 mutex_unlock(&cpuidle_lock);
42 return i;
45 static ssize_t show_current_driver(struct device *dev,
46 struct device_attribute *attr,
47 char *buf)
49 ssize_t ret;
50 struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
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);
59 return ret;
62 static ssize_t show_current_governor(struct device *dev,
63 struct device_attribute *attr,
64 char *buf)
66 ssize_t ret;
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);
75 return ret;
78 static ssize_t store_current_governor(struct device *dev,
79 struct device_attribute *attr,
80 const char *buf, size_t count)
82 char gov_name[CPUIDLE_NAME_LEN];
83 int ret = -EINVAL;
84 size_t len = count;
85 struct cpuidle_governor *gov;
87 if (!len || len >= sizeof(gov_name))
88 return -EINVAL;
90 memcpy(gov_name, buf, len);
91 gov_name[len] = '\0';
92 if (gov_name[len - 1] == '\n')
93 gov_name[--len] = '\0';
95 mutex_lock(&cpuidle_lock);
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;
104 mutex_unlock(&cpuidle_lock);
106 if (ret)
107 return ret;
108 else
109 return count;
112 static DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL);
113 static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL);
115 static struct attribute *cpuidle_default_attrs[] = {
116 &dev_attr_current_driver.attr,
117 &dev_attr_current_governor_ro.attr,
118 NULL
121 static DEVICE_ATTR(available_governors, 0444, show_available_governors, NULL);
122 static DEVICE_ATTR(current_governor, 0644, show_current_governor,
123 store_current_governor);
125 static struct attribute *cpuidle_switch_attrs[] = {
126 &dev_attr_available_governors.attr,
127 &dev_attr_current_driver.attr,
128 &dev_attr_current_governor.attr,
129 NULL
132 static struct attribute_group cpuidle_attr_group = {
133 .attrs = cpuidle_default_attrs,
134 .name = "cpuidle",
138 * cpuidle_add_interface - add CPU global sysfs attributes
140 int cpuidle_add_interface(struct device *dev)
142 if (sysfs_switch)
143 cpuidle_attr_group.attrs = cpuidle_switch_attrs;
145 return sysfs_create_group(&dev->kobj, &cpuidle_attr_group);
149 * cpuidle_remove_interface - remove CPU global sysfs attributes
151 void cpuidle_remove_interface(struct device *dev)
153 sysfs_remove_group(&dev->kobj, &cpuidle_attr_group);
156 struct cpuidle_attr {
157 struct attribute attr;
158 ssize_t (*show)(struct cpuidle_device *, char *);
159 ssize_t (*store)(struct cpuidle_device *, const char *, size_t count);
162 #define define_one_ro(_name, show) \
163 static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
164 #define define_one_rw(_name, show, store) \
165 static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store)
167 #define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj)
168 #define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
169 static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf)
171 int ret = -EIO;
172 struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
173 struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
175 if (cattr->show) {
176 mutex_lock(&cpuidle_lock);
177 ret = cattr->show(dev, buf);
178 mutex_unlock(&cpuidle_lock);
180 return ret;
183 static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr,
184 const char * buf, size_t count)
186 int ret = -EIO;
187 struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
188 struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
190 if (cattr->store) {
191 mutex_lock(&cpuidle_lock);
192 ret = cattr->store(dev, buf, count);
193 mutex_unlock(&cpuidle_lock);
195 return ret;
198 static const struct sysfs_ops cpuidle_sysfs_ops = {
199 .show = cpuidle_show,
200 .store = cpuidle_store,
203 static void cpuidle_sysfs_release(struct kobject *kobj)
205 struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
207 complete(&dev->kobj_unregister);
210 static struct kobj_type ktype_cpuidle = {
211 .sysfs_ops = &cpuidle_sysfs_ops,
212 .release = cpuidle_sysfs_release,
215 struct cpuidle_state_attr {
216 struct attribute attr;
217 ssize_t (*show)(struct cpuidle_state *, \
218 struct cpuidle_state_usage *, char *);
219 ssize_t (*store)(struct cpuidle_state *, const char *, size_t);
222 #define define_one_state_ro(_name, show) \
223 static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
225 #define define_show_state_function(_name) \
226 static ssize_t show_state_##_name(struct cpuidle_state *state, \
227 struct cpuidle_state_usage *state_usage, char *buf) \
229 return sprintf(buf, "%u\n", state->_name);\
232 #define define_show_state_ull_function(_name) \
233 static ssize_t show_state_##_name(struct cpuidle_state *state, \
234 struct cpuidle_state_usage *state_usage, char *buf) \
236 return sprintf(buf, "%llu\n", state_usage->_name);\
239 #define define_show_state_str_function(_name) \
240 static ssize_t show_state_##_name(struct cpuidle_state *state, \
241 struct cpuidle_state_usage *state_usage, char *buf) \
243 if (state->_name[0] == '\0')\
244 return sprintf(buf, "<null>\n");\
245 return sprintf(buf, "%s\n", state->_name);\
248 define_show_state_function(exit_latency)
249 define_show_state_function(power_usage)
250 define_show_state_ull_function(usage)
251 define_show_state_ull_function(time)
252 define_show_state_str_function(name)
253 define_show_state_str_function(desc)
255 define_one_state_ro(name, show_state_name);
256 define_one_state_ro(desc, show_state_desc);
257 define_one_state_ro(latency, show_state_exit_latency);
258 define_one_state_ro(power, show_state_power_usage);
259 define_one_state_ro(usage, show_state_usage);
260 define_one_state_ro(time, show_state_time);
262 static struct attribute *cpuidle_state_default_attrs[] = {
263 &attr_name.attr,
264 &attr_desc.attr,
265 &attr_latency.attr,
266 &attr_power.attr,
267 &attr_usage.attr,
268 &attr_time.attr,
269 NULL
272 #define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
273 #define kobj_to_state(k) (kobj_to_state_obj(k)->state)
274 #define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage)
275 #define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
276 static ssize_t cpuidle_state_show(struct kobject * kobj,
277 struct attribute * attr ,char * buf)
279 int ret = -EIO;
280 struct cpuidle_state *state = kobj_to_state(kobj);
281 struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
282 struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);
284 if (cattr->show)
285 ret = cattr->show(state, state_usage, buf);
287 return ret;
290 static const struct sysfs_ops cpuidle_state_sysfs_ops = {
291 .show = cpuidle_state_show,
294 static void cpuidle_state_sysfs_release(struct kobject *kobj)
296 struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
298 complete(&state_obj->kobj_unregister);
301 static struct kobj_type ktype_state_cpuidle = {
302 .sysfs_ops = &cpuidle_state_sysfs_ops,
303 .default_attrs = cpuidle_state_default_attrs,
304 .release = cpuidle_state_sysfs_release,
307 static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
309 kobject_put(&device->kobjs[i]->kobj);
310 wait_for_completion(&device->kobjs[i]->kobj_unregister);
311 kfree(device->kobjs[i]);
312 device->kobjs[i] = NULL;
316 * cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes
317 * @device: the target device
319 int cpuidle_add_state_sysfs(struct cpuidle_device *device)
321 int i, ret = -ENOMEM;
322 struct cpuidle_state_kobj *kobj;
323 struct cpuidle_driver *drv = cpuidle_get_driver();
325 /* state statistics */
326 for (i = 0; i < device->state_count; i++) {
327 kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
328 if (!kobj)
329 goto error_state;
330 kobj->state = &drv->states[i];
331 kobj->state_usage = &device->states_usage[i];
332 init_completion(&kobj->kobj_unregister);
334 ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, &device->kobj,
335 "state%d", i);
336 if (ret) {
337 kfree(kobj);
338 goto error_state;
340 kobject_uevent(&kobj->kobj, KOBJ_ADD);
341 device->kobjs[i] = kobj;
344 return 0;
346 error_state:
347 for (i = i - 1; i >= 0; i--)
348 cpuidle_free_state_kobj(device, i);
349 return ret;
353 * cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes
354 * @device: the target device
356 void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
358 int i;
360 for (i = 0; i < device->state_count; i++)
361 cpuidle_free_state_kobj(device, i);
365 * cpuidle_add_sysfs - creates a sysfs instance for the target device
366 * @dev: the target device
368 int cpuidle_add_sysfs(struct device *cpu_dev)
370 int cpu = cpu_dev->id;
371 struct cpuidle_device *dev;
372 int error;
374 dev = per_cpu(cpuidle_devices, cpu);
375 error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
376 "cpuidle");
377 if (!error)
378 kobject_uevent(&dev->kobj, KOBJ_ADD);
379 return error;
383 * cpuidle_remove_sysfs - deletes a sysfs instance on the target device
384 * @dev: the target device
386 void cpuidle_remove_sysfs(struct device *cpu_dev)
388 int cpu = cpu_dev->id;
389 struct cpuidle_device *dev;
391 dev = per_cpu(cpuidle_devices, cpu);
392 kobject_put(&dev->kobj);