[linux.git] / drivers / cpuidle / sysfs.c

/*
 * sysfs.c - sysfs support
 *
 * (C) 2006-2007 Shaohua Li <[email protected]>
 *
 * This code is licenced under the GPL.
 */

#include <linux/kernel.h>
#include <linux/cpuidle.h>
#include <linux/sysfs.h>
#include <linux/cpu.h>

#include "cpuidle.h"

static unsigned int sysfs_switch;
static int __init cpuidle_sysfs_setup(char *unused)
{
	sysfs_switch = 1;
	return 1;
}
__setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup);

static ssize_t show_available_governors(struct sys_device *dev, char *buf)
{
	ssize_t i = 0;
	struct cpuidle_governor *tmp;

	mutex_lock(&cpuidle_lock);
	list_for_each_entry(tmp, &cpuidle_governors, governor_list) {
		if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - CPUIDLE_NAME_LEN - 2))
			goto out;
		i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name);
	}

out:
	i+= sprintf(&buf[i], "\n");
	mutex_unlock(&cpuidle_lock);
	return i;
}

static ssize_t show_current_driver(struct sys_device *dev, char *buf)
{
	ssize_t ret;

	spin_lock(&cpuidle_driver_lock);
	if (cpuidle_curr_driver)
		ret = sprintf(buf, "%s\n", cpuidle_curr_driver->name);
	else
		ret = sprintf(buf, "none\n");
	spin_unlock(&cpuidle_driver_lock);

	return ret;
}

static ssize_t show_current_governor(struct sys_device *dev, char *buf)
{
	ssize_t ret;

	mutex_lock(&cpuidle_lock);
	if (cpuidle_curr_governor)
		ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name);
	else
		ret = sprintf(buf, "none\n");
	mutex_unlock(&cpuidle_lock);

	return ret;
}

static ssize_t store_current_governor(struct sys_device *dev,
	const char *buf, size_t count)
{
	char gov_name[CPUIDLE_NAME_LEN];
	int ret = -EINVAL;
	size_t len = count;
	struct cpuidle_governor *gov;

	if (!len || len >= sizeof(gov_name))
		return -EINVAL;

	memcpy(gov_name, buf, len);
	gov_name[len] = '\0';
	if (gov_name[len - 1] == '\n')
		gov_name[--len] = '\0';

	mutex_lock(&cpuidle_lock);

	list_for_each_entry(gov, &cpuidle_governors, governor_list) {
		if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) {
			ret = cpuidle_switch_governor(gov);
			break;
		}
	}

	mutex_unlock(&cpuidle_lock);

	if (ret)
		return ret;
	else
		return count;
}

static SYSDEV_ATTR(current_driver, 0444, show_current_driver, NULL);
static SYSDEV_ATTR(current_governor_ro, 0444, show_current_governor, NULL);

static struct attribute *cpuclass_default_attrs[] = {
	&attr_current_driver.attr,
	&attr_current_governor_ro.attr,
	NULL
};

static SYSDEV_ATTR(available_governors, 0444, show_available_governors, NULL);
static SYSDEV_ATTR(current_governor, 0644, show_current_governor,
	store_current_governor);

static struct attribute *cpuclass_switch_attrs[] = {
	&attr_available_governors.attr,
	&attr_current_driver.attr,
	&attr_current_governor.attr,
	NULL
};

static struct attribute_group cpuclass_attr_group = {
	.attrs = cpuclass_default_attrs,
	.name = "cpuidle",
};

/**
 * cpuidle_add_class_sysfs - add CPU global sysfs attributes
 */
int cpuidle_add_class_sysfs(struct sysdev_class *cls)
{
	if (sysfs_switch)
		cpuclass_attr_group.attrs = cpuclass_switch_attrs;

	return sysfs_create_group(&cls->kset.kobj, &cpuclass_attr_group);
}

/**
 * cpuidle_remove_class_sysfs - remove CPU global sysfs attributes
 */
void cpuidle_remove_class_sysfs(struct sysdev_class *cls)
{
	sysfs_remove_group(&cls->kset.kobj, &cpuclass_attr_group);
}

struct cpuidle_attr {
	struct attribute attr;
	ssize_t (*show)(struct cpuidle_device *, char *);
	ssize_t (*store)(struct cpuidle_device *, const char *, size_t count);
};

#define define_one_ro(_name, show) \
	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
#define define_one_rw(_name, show, store) \
	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store)

#define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj)
#define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf)
{
	int ret = -EIO;
	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
	struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);

	if (cattr->show) {
		mutex_lock(&cpuidle_lock);
		ret = cattr->show(dev, buf);
		mutex_unlock(&cpuidle_lock);
	}
	return ret;
}

static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr,
		     const char * buf, size_t count)
{
	int ret = -EIO;
	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
	struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);

	if (cattr->store) {
		mutex_lock(&cpuidle_lock);
		ret = cattr->store(dev, buf, count);
		mutex_unlock(&cpuidle_lock);
	}
	return ret;
}

static struct sysfs_ops cpuidle_sysfs_ops = {
	.show = cpuidle_show,
	.store = cpuidle_store,
};

static void cpuidle_sysfs_release(struct kobject *kobj)
{
	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);

	complete(&dev->kobj_unregister);
}

static struct kobj_type ktype_cpuidle = {
	.sysfs_ops = &cpuidle_sysfs_ops,
	.release = cpuidle_sysfs_release,
};

struct cpuidle_state_attr {
	struct attribute attr;
	ssize_t (*show)(struct cpuidle_state *, char *);
	ssize_t (*store)(struct cpuidle_state *, const char *, size_t);
};

#define define_one_state_ro(_name, show) \
static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)

#define define_show_state_function(_name) \
static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \
{ \
	return sprintf(buf, "%u\n", state->_name);\
}

static ssize_t show_state_name(struct cpuidle_state *state, char *buf)
{
	return sprintf(buf, "%s\n", state->name);
}

define_show_state_function(exit_latency)
define_show_state_function(power_usage)
define_show_state_function(usage)
define_show_state_function(time)
define_one_state_ro(name, show_state_name);
define_one_state_ro(latency, show_state_exit_latency);
define_one_state_ro(power, show_state_power_usage);
define_one_state_ro(usage, show_state_usage);
define_one_state_ro(time, show_state_time);

static struct attribute *cpuidle_state_default_attrs[] = {
	&attr_name.attr,
	&attr_latency.attr,
	&attr_power.attr,
	&attr_usage.attr,
	&attr_time.attr,
	NULL
};

#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
static ssize_t cpuidle_state_show(struct kobject * kobj,
	struct attribute * attr ,char * buf)
{
	int ret = -EIO;
	struct cpuidle_state *state = kobj_to_state(kobj);
	struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);

	if (cattr->show)
		ret = cattr->show(state, buf);

	return ret;
}

static struct sysfs_ops cpuidle_state_sysfs_ops = {
	.show = cpuidle_state_show,
};

static void cpuidle_state_sysfs_release(struct kobject *kobj)
{
	struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);

	complete(&state_obj->kobj_unregister);
}

static struct kobj_type ktype_state_cpuidle = {
	.sysfs_ops = &cpuidle_state_sysfs_ops,
	.default_attrs = cpuidle_state_default_attrs,
	.release = cpuidle_state_sysfs_release,
};

static void inline cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
{
	kobject_put(&device->kobjs[i]->kobj);
	wait_for_completion(&device->kobjs[i]->kobj_unregister);
	kfree(device->kobjs[i]);
	device->kobjs[i] = NULL;
}

/**
 * cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes
 * @device: the target device
 */
int cpuidle_add_state_sysfs(struct cpuidle_device *device)
{
	int i, ret = -ENOMEM;
	struct cpuidle_state_kobj *kobj;

	/* state statistics */
	for (i = 0; i < device->state_count; i++) {
		kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
		if (!kobj)
			goto error_state;
		kobj->state = &device->states[i];
		init_completion(&kobj->kobj_unregister);

		ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, &device->kobj,
					   "state%d", i);
		if (ret) {
			kfree(kobj);
			goto error_state;
		}
		kobject_uevent(&kobj->kobj, KOBJ_ADD);
		device->kobjs[i] = kobj;
	}

	return 0;

error_state:
	for (i = i - 1; i >= 0; i--)
		cpuidle_free_state_kobj(device, i);
	return ret;
}

/**
 * cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes
 * @device: the target device
 */
void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
{
	int i;

	for (i = 0; i < device->state_count; i++)
		cpuidle_free_state_kobj(device, i);
}

/**
 * cpuidle_add_sysfs - creates a sysfs instance for the target device
 * @sysdev: the target device
 */
int cpuidle_add_sysfs(struct sys_device *sysdev)
{
	int cpu = sysdev->id;
	struct cpuidle_device *dev;
	int error;

	dev = per_cpu(cpuidle_devices, cpu);
	error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &sysdev->kobj,
				     "cpuidle");
	if (!error)
		kobject_uevent(&dev->kobj, KOBJ_ADD);
	return error;
}

/**
 * cpuidle_remove_sysfs - deletes a sysfs instance on the target device
 * @sysdev: the target device
 */
void cpuidle_remove_sysfs(struct sys_device *sysdev)
{
	int cpu = sysdev->id;
	struct cpuidle_device *dev;

	dev = per_cpu(cpuidle_devices, cpu);
	kobject_put(&dev->kobj);
}
Commit	Line	Data
4f86d3a8 LB	1	/*
	2	* sysfs.c - sysfs support
	3	*
	4	* (C) 2006-2007 Shaohua Li <[email protected]>
	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
	24	static ssize_t show_available_governors(struct sys_device dev, char buf)
	25	{
	26	ssize_t i = 0;
	27	struct cpuidle_governor *tmp;
	28
	29	mutex_lock(&cpuidle_lock);
	30	list_for_each_entry(tmp, &cpuidle_governors, governor_list) {
	31	if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - CPUIDLE_NAME_LEN - 2))
	32	goto out;
	33	i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name);
	34	}
	35
	36	out:
	37	i+= sprintf(&buf[i], "\n");
	38	mutex_unlock(&cpuidle_lock);
	39	return i;
	40	}
	41
	42	static ssize_t show_current_driver(struct sys_device dev, char buf)
	43	{
	44	ssize_t ret;
	45
	46	spin_lock(&cpuidle_driver_lock);
	47	if (cpuidle_curr_driver)
	48	ret = sprintf(buf, "%s\n", cpuidle_curr_driver->name);
	49	else
	50	ret = sprintf(buf, "none\n");
	51	spin_unlock(&cpuidle_driver_lock);
	52
	53	return ret;
	54	}
	55
	56	static ssize_t show_current_governor(struct sys_device dev, char buf)
	57	{
	58	ssize_t ret;
	59
	60	mutex_lock(&cpuidle_lock);
	61	if (cpuidle_curr_governor)
	62	ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name);
	63	else
	64	ret = sprintf(buf, "none\n");
65	mutex_unlock(&cpuidle_lock);
66
67	return ret;
68	}
69
70	static ssize_t store_current_governor(struct sys_device *dev,
71	const char *buf, size_t count)
72	{
73	char gov_name[CPUIDLE_NAME_LEN];
74	int ret = -EINVAL;
75	size_t len = count;
76	struct cpuidle_governor *gov;
77
78	if (!len \|\| len >= sizeof(gov_name))
79	return -EINVAL;
80
81	memcpy(gov_name, buf, len);
82	gov_name[len] = '\0';
83	if (gov_name[len - 1] == '\n')
84	gov_name[--len] = '\0';
85
86	mutex_lock(&cpuidle_lock);
87
88	list_for_each_entry(gov, &cpuidle_governors, governor_list) {
89	if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) {
90	ret = cpuidle_switch_governor(gov);
91	break;
92	}
93	}
94
95	mutex_unlock(&cpuidle_lock);
96
97	if (ret)
98	return ret;
99	else
100	return count;
101	}
102
103	static SYSDEV_ATTR(current_driver, 0444, show_current_driver, NULL);
104	static SYSDEV_ATTR(current_governor_ro, 0444, show_current_governor, NULL);
105
106	static struct attribute *cpuclass_default_attrs[] = {
107	&attr_current_driver.attr,
108	&attr_current_governor_ro.attr,
109	NULL
110	};
111
112	static SYSDEV_ATTR(available_governors, 0444, show_available_governors, NULL);
113	static SYSDEV_ATTR(current_governor, 0644, show_current_governor,
114	store_current_governor);
115
116	static struct attribute *cpuclass_switch_attrs[] = {
117	&attr_available_governors.attr,
118	&attr_current_driver.attr,
119	&attr_current_governor.attr,
120	NULL
121	};
122
123	static struct attribute_group cpuclass_attr_group = {
124	.attrs = cpuclass_default_attrs,
125	.name = "cpuidle",
126	};
127
128	/**
129	* cpuidle_add_class_sysfs - add CPU global sysfs attributes
130	*/
131	int cpuidle_add_class_sysfs(struct sysdev_class *cls)
132	{
133	if (sysfs_switch)
134	cpuclass_attr_group.attrs = cpuclass_switch_attrs;
135
136	return sysfs_create_group(&cls->kset.kobj, &cpuclass_attr_group);
137	}
138
139	/**
140	* cpuidle_remove_class_sysfs - remove CPU global sysfs attributes
141	*/
142	void cpuidle_remove_class_sysfs(struct sysdev_class *cls)
143	{
144	sysfs_remove_group(&cls->kset.kobj, &cpuclass_attr_group);
145	}
146
147	struct cpuidle_attr {
148	struct attribute attr;
149	ssize_t (show)(struct cpuidle_device , char *);
150	ssize_t (store)(struct cpuidle_device , const char *, size_t count);
151	};
152
153	#define define_one_ro(_name, show) \
154	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
155	#define define_one_rw(_name, show, store) \
156	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store)
157
158	#define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj)
159	#define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
160	static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf)
161	{
162	int ret = -EIO;
163	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
164	struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
165
166	if (cattr->show) {
167	mutex_lock(&cpuidle_lock);
168	ret = cattr->show(dev, buf);
169	mutex_unlock(&cpuidle_lock);
170	}
171	return ret;
172	}
173
174	static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr,
175	const char * buf, size_t count)
176	{
177	int ret = -EIO;
178	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
179	struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
180
181	if (cattr->store) {
182	mutex_lock(&cpuidle_lock);
183	ret = cattr->store(dev, buf, count);
184	mutex_unlock(&cpuidle_lock);
185	}
186	return ret;
187	}
188
189	static struct sysfs_ops cpuidle_sysfs_ops = {
190	.show = cpuidle_show,
191	.store = cpuidle_store,
192	};
193
194	static void cpuidle_sysfs_release(struct kobject *kobj)
195	{
196	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
197
198	complete(&dev->kobj_unregister);
199	}
200
201	static struct kobj_type ktype_cpuidle = {
202	.sysfs_ops = &cpuidle_sysfs_ops,
203	.release = cpuidle_sysfs_release,
204	};
205
206	struct cpuidle_state_attr {
207	struct attribute attr;
208	ssize_t (show)(struct cpuidle_state , char *);
209	ssize_t (store)(struct cpuidle_state , const char *, size_t);
210	};
211
212	#define define_one_state_ro(_name, show) \
213	static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
214
215	#define define_show_state_function(_name) \
216	static ssize_t show_state_##_name(struct cpuidle_state state, char buf) \
217	{ \
218	return sprintf(buf, "%u\n", state->_name);\
219	}
220
221	static ssize_t show_state_name(struct cpuidle_state state, char buf)
222	{
223	return sprintf(buf, "%s\n", state->name);
224	}
225
226	define_show_state_function(exit_latency)
227	define_show_state_function(power_usage)
228	define_show_state_function(usage)
229	define_show_state_function(time)
230	define_one_state_ro(name, show_state_name);
231	define_one_state_ro(latency, show_state_exit_latency);
232	define_one_state_ro(power, show_state_power_usage);
233	define_one_state_ro(usage, show_state_usage);
234	define_one_state_ro(time, show_state_time);
235
236	static struct attribute *cpuidle_state_default_attrs[] = {
237	&attr_name.attr,
238	&attr_latency.attr,
239	&attr_power.attr,
240	&attr_usage.attr,
241	&attr_time.attr,
242	NULL
243	};
244
245	#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
246	#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
247	#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
248	static ssize_t cpuidle_state_show(struct kobject * kobj,
249	struct attribute * attr ,char * buf)
250	{
251	int ret = -EIO;
252	struct cpuidle_state *state = kobj_to_state(kobj);
253	struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);
254
255	if (cattr->show)
256	ret = cattr->show(state, buf);
257
258	return ret;
259	}
260
261	static struct sysfs_ops cpuidle_state_sysfs_ops = {
262	.show = cpuidle_state_show,
263	};
264
265	static void cpuidle_state_sysfs_release(struct kobject *kobj)
266	{
267	struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
268
269	complete(&state_obj->kobj_unregister);
270	}
271
272	static struct kobj_type ktype_state_cpuidle = {
273	.sysfs_ops = &cpuidle_state_sysfs_ops,
274	.default_attrs = cpuidle_state_default_attrs,
275	.release = cpuidle_state_sysfs_release,
276	};
277
278	static void inline cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
279	{
c10997f6	280	kobject_put(&device->kobjs[i]->kobj);
4f86d3a8 LB	281	wait_for_completion(&device->kobjs[i]->kobj_unregister);
	282	kfree(device->kobjs[i]);
	283	device->kobjs[i] = NULL;
	284	}
	285
	286	/**
	287	* cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes
	288	* @device: the target device
	289	*/
	290	int cpuidle_add_state_sysfs(struct cpuidle_device *device)
	291	{
	292	int i, ret = -ENOMEM;
	293	struct cpuidle_state_kobj *kobj;
	294
	295	/* state statistics */
	296	for (i = 0; i < device->state_count; i++) {
	297	kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
	298	if (!kobj)
	299	goto error_state;
	300	kobj->state = &device->states[i];
	301	init_completion(&kobj->kobj_unregister);
	302
94f57f33 GKH	303	ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, &device->kobj,
94f57f33 GKH	304	"state%d", i);
4f86d3a8 LB	305	if (ret) {
	306	kfree(kobj);
	307	goto error_state;
	308	}
94f57f33	309	kobject_uevent(&kobj->kobj, KOBJ_ADD);
4f86d3a8 LB	310	device->kobjs[i] = kobj;
	311	}
	312
	313	return 0;
	314
	315	error_state:
	316	for (i = i - 1; i >= 0; i--)
	317	cpuidle_free_state_kobj(device, i);
	318	return ret;
	319	}
	320
	321	/**
	322	* cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes
	323	* @device: the target device
	324	*/
	325	void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
	326	{
	327	int i;
	328
	329	for (i = 0; i < device->state_count; i++)
	330	cpuidle_free_state_kobj(device, i);
	331	}
	332
	333	/**
	334	* cpuidle_add_sysfs - creates a sysfs instance for the target device
	335	* @sysdev: the target device
	336	*/
	337	int cpuidle_add_sysfs(struct sys_device *sysdev)
	338	{
	339	int cpu = sysdev->id;
	340	struct cpuidle_device *dev;
94f57f33	341	int error;
4f86d3a8 LB	342
4f86d3a8 LB	343	dev = per_cpu(cpuidle_devices, cpu);
94f57f33 GKH	344	error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &sysdev->kobj,
	345	"cpuidle");
	346	if (!error)
	347	kobject_uevent(&dev->kobj, KOBJ_ADD);
	348	return error;
4f86d3a8 LB	349	}
	350
	351	/**
	352	* cpuidle_remove_sysfs - deletes a sysfs instance on the target device
	353	* @sysdev: the target device
	354	*/
	355	void cpuidle_remove_sysfs(struct sys_device *sysdev)
	356	{
	357	int cpu = sysdev->id;
	358	struct cpuidle_device *dev;
	359
	360	dev = per_cpu(cpuidle_devices, cpu);
c10997f6	361	kobject_put(&dev->kobj);
4f86d3a8	362	}