[mirror_ubuntu-artful-kernel.git] / drivers / cpuidle / sysfs.c

/*
 * sysfs.c - sysfs support
 *
 * (C) 2006-2007 Shaohua Li <shaohua.li@intel.com>
 *
 * This code is licenced under the GPL.
 */

#include <linux/kernel.h>
#include <linux/cpuidle.h>
#include <linux/sysfs.h>
#include <linux/slab.h>
#include <linux/cpu.h>
#include <linux/capability.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 device *dev,
					struct device_attribute *attr,
					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 device *dev,
				   struct device_attribute *attr,
				   char *buf)
{
	ssize_t ret;
	struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();

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

	return ret;
}

static ssize_t show_current_governor(struct device *dev,
				     struct device_attribute *attr,
				     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 device *dev,
				      struct device_attribute *attr,
				      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 DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL);
static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL);

static struct attribute *cpuidle_default_attrs[] = {
	&dev_attr_current_driver.attr,
	&dev_attr_current_governor_ro.attr,
	NULL
};

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

static struct attribute *cpuidle_switch_attrs[] = {
	&dev_attr_available_governors.attr,
	&dev_attr_current_driver.attr,
	&dev_attr_current_governor.attr,
	NULL
};

static struct attribute_group cpuidle_attr_group = {
	.attrs = cpuidle_default_attrs,
	.name = "cpuidle",
};

/**
 * cpuidle_add_interface - add CPU global sysfs attributes
 */
int cpuidle_add_interface(struct device *dev)
{
	if (sysfs_switch)
		cpuidle_attr_group.attrs = cpuidle_switch_attrs;

	return sysfs_create_group(&dev->kobj, &cpuidle_attr_group);
}

/**
 * cpuidle_remove_interface - remove CPU global sysfs attributes
 */
void cpuidle_remove_interface(struct device *dev)
{
	sysfs_remove_group(&dev->kobj, &cpuidle_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 const 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 *, \
					struct cpuidle_state_usage *, char *);
	ssize_t (*store)(struct cpuidle_state *, \
			struct cpuidle_state_usage *, 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_one_state_rw(_name, show, store) \
static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store)

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

#define define_store_state_ull_function(_name) \
static ssize_t store_state_##_name(struct cpuidle_state *state, \
		struct cpuidle_state_usage *state_usage, \
		const char *buf, size_t size) \
{ \
	unsigned long long value; \
	int err; \
	if (!capable(CAP_SYS_ADMIN)) \
		return -EPERM; \
	err = kstrtoull(buf, 0, &value); \
	if (err) \
		return err; \
	if (value) \
		state_usage->_name = 1; \
	else \
		state_usage->_name = 0; \
	return size; \
}

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

#define define_show_state_str_function(_name) \
static ssize_t show_state_##_name(struct cpuidle_state *state, \
			struct cpuidle_state_usage *state_usage, char *buf) \
{ \
	if (state->_name[0] == '\0')\
		return sprintf(buf, "<null>\n");\
	return sprintf(buf, "%s\n", state->_name);\
}

define_show_state_function(exit_latency)
define_show_state_function(power_usage)
define_show_state_ull_function(usage)
define_show_state_ull_function(time)
define_show_state_str_function(name)
define_show_state_str_function(desc)
define_show_state_ull_function(disable)
define_store_state_ull_function(disable)

define_one_state_ro(name, show_state_name);
define_one_state_ro(desc, show_state_desc);
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);
define_one_state_rw(disable, show_state_disable, store_state_disable);

static struct attribute *cpuidle_state_default_attrs[] = {
	&attr_name.attr,
	&attr_desc.attr,
	&attr_latency.attr,
	&attr_power.attr,
	&attr_usage.attr,
	&attr_time.attr,
	&attr_disable.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 kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage)
#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_usage *state_usage = kobj_to_state_usage(kobj);
	struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);

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

	return ret;
}

static ssize_t cpuidle_state_store(struct kobject *kobj,
	struct attribute *attr, const char *buf, size_t size)
{
	int ret = -EIO;
	struct cpuidle_state *state = kobj_to_state(kobj);
	struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
	struct cpuidle_state_attr *cattr = attr_to_stateattr(attr);

	if (cattr->store)
		ret = cattr->store(state, state_usage, buf, size);

	return ret;
}

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

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 inline void 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;
	struct cpuidle_driver *drv = cpuidle_get_driver();

	/* 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 = &drv->states[i];
		kobj->state_usage = &device->states_usage[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
 * @dev: the target device
 */
int cpuidle_add_sysfs(struct cpuidle_device *dev)
{
	struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);
	int error;

	init_completion(&dev->kobj_unregister);

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

/**
 * cpuidle_remove_sysfs - deletes a sysfs instance on the target device
 * @dev: the target device
 */
void cpuidle_remove_sysfs(struct cpuidle_device *dev)
{
	kobject_put(&dev->kobj);
	wait_for_completion(&dev->kobj_unregister);
}
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>
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,
8a25a2fd KS	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,
8a25a2fd KS	47	struct device_attribute *attr,
66198f36	48	char *buf)
4f86d3a8 LB	49	{
4f86d3a8 LB	50	ssize_t ret;
752138df	51	struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
4f86d3a8 LB	52
4f86d3a8 LB	53	spin_lock(&cpuidle_driver_lock);
752138df LB	54	if (cpuidle_driver)
752138df LB	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,
8a25a2fd KS	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,
8a25a2fd KS	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);
8a25a2fd KS	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 = {
8a25a2fd KS	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	{
4f86d3a8 LB	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 , \
4202735e DD	219	struct cpuidle_state_usage , char );
dc7fd275 SL	220	ssize_t (store)(struct cpuidle_state , \
dc7fd275 SL	221	struct cpuidle_state_usage , const char , size_t);
4f86d3a8 LB	222	};
	223
	224	#define define_one_state_ro(_name, show) \
	225	static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
	226
3a53396b SL	227	#define define_one_state_rw(_name, show, store) \
	228	static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store)
	229
4f86d3a8	230	#define define_show_state_function(_name) \
4202735e DD	231	static ssize_t show_state_##_name(struct cpuidle_state *state, \
4202735e DD	232	struct cpuidle_state_usage state_usage, char buf) \
4f86d3a8 LB	233	{ \
	234	return sprintf(buf, "%u\n", state->_name);\
	235	}
	236
dc7fd275	237	#define define_store_state_ull_function(_name) \
3a53396b	238	static ssize_t store_state_##_name(struct cpuidle_state *state, \
dc7fd275	239	struct cpuidle_state_usage *state_usage, \
3a53396b SL	240	const char *buf, size_t size) \
3a53396b SL	241	{ \
dc7fd275	242	unsigned long long value; \
3a53396b SL	243	int err; \
	244	if (!capable(CAP_SYS_ADMIN)) \
	245	return -EPERM; \
dc7fd275	246	err = kstrtoull(buf, 0, &value); \
3a53396b SL	247	if (err) \
	248	return err; \
	249	if (value) \
dc7fd275	250	state_usage->_name = 1; \
3a53396b	251	else \
dc7fd275	252	state_usage->_name = 0; \
3a53396b SL	253	return size; \
	254	}
	255
8b78cf60	256	#define define_show_state_ull_function(_name) \
4202735e DD	257	static ssize_t show_state_##_name(struct cpuidle_state *state, \
4202735e DD	258	struct cpuidle_state_usage state_usage, char buf) \
8b78cf60	259	{ \
4202735e	260	return sprintf(buf, "%llu\n", state_usage->_name);\
8b78cf60 YY	261	}
8b78cf60 YY	262
4fcb2fcd	263	#define define_show_state_str_function(_name) \
4202735e DD	264	static ssize_t show_state_##_name(struct cpuidle_state *state, \
4202735e DD	265	struct cpuidle_state_usage state_usage, char buf) \
4fcb2fcd VP	266	{ \
	267	if (state->_name[0] == '\0')\
	268	return sprintf(buf, "<null>\n");\
	269	return sprintf(buf, "%s\n", state->_name);\
4f86d3a8 LB	270	}
	271
	272	define_show_state_function(exit_latency)
	273	define_show_state_function(power_usage)
8b78cf60 YY	274	define_show_state_ull_function(usage)
8b78cf60 YY	275	define_show_state_ull_function(time)
4fcb2fcd VP	276	define_show_state_str_function(name)
4fcb2fcd VP	277	define_show_state_str_function(desc)
dc7fd275 SL	278	define_show_state_ull_function(disable)
dc7fd275 SL	279	define_store_state_ull_function(disable)
4fcb2fcd	280
4f86d3a8	281	define_one_state_ro(name, show_state_name);
4fcb2fcd	282	define_one_state_ro(desc, show_state_desc);
4f86d3a8 LB	283	define_one_state_ro(latency, show_state_exit_latency);
	284	define_one_state_ro(power, show_state_power_usage);
	285	define_one_state_ro(usage, show_state_usage);
	286	define_one_state_ro(time, show_state_time);
3a53396b	287	define_one_state_rw(disable, show_state_disable, store_state_disable);
4f86d3a8 LB	288
	289	static struct attribute *cpuidle_state_default_attrs[] = {
	290	&attr_name.attr,
4fcb2fcd	291	&attr_desc.attr,
4f86d3a8 LB	292	&attr_latency.attr,
	293	&attr_power.attr,
	294	&attr_usage.attr,
	295	&attr_time.attr,
3a53396b	296	&attr_disable.attr,
4f86d3a8 LB	297	NULL
	298	};
	299
	300	#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
	301	#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
4202735e	302	#define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage)
4f86d3a8 LB	303	#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
	304	static ssize_t cpuidle_state_show(struct kobject * kobj,
	305	struct attribute * attr ,char * buf)
	306	{
	307	int ret = -EIO;
	308	struct cpuidle_state *state = kobj_to_state(kobj);
4202735e	309	struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
4f86d3a8 LB	310	struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);
	311
	312	if (cattr->show)
4202735e	313	ret = cattr->show(state, state_usage, buf);
4f86d3a8 LB	314
	315	return ret;
	316	}
	317
3a53396b SL	318	static ssize_t cpuidle_state_store(struct kobject *kobj,
	319	struct attribute attr, const char buf, size_t size)
	320	{
	321	int ret = -EIO;
	322	struct cpuidle_state *state = kobj_to_state(kobj);
dc7fd275	323	struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
3a53396b SL	324	struct cpuidle_state_attr *cattr = attr_to_stateattr(attr);
	325
	326	if (cattr->store)
dc7fd275	327	ret = cattr->store(state, state_usage, buf, size);
3a53396b SL	328
	329	return ret;
	330	}
	331
52cf25d0	332	static const struct sysfs_ops cpuidle_state_sysfs_ops = {
4f86d3a8	333	.show = cpuidle_state_show,
3a53396b	334	.store = cpuidle_state_store,
4f86d3a8 LB	335	};
	336
	337	static void cpuidle_state_sysfs_release(struct kobject *kobj)
	338	{
	339	struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
	340
	341	complete(&state_obj->kobj_unregister);
	342	}
	343
	344	static struct kobj_type ktype_state_cpuidle = {
	345	.sysfs_ops = &cpuidle_state_sysfs_ops,
	346	.default_attrs = cpuidle_state_default_attrs,
	347	.release = cpuidle_state_sysfs_release,
	348	};
	349
42b16b3f	350	static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
4f86d3a8	351	{
c10997f6	352	kobject_put(&device->kobjs[i]->kobj);
4f86d3a8 LB	353	wait_for_completion(&device->kobjs[i]->kobj_unregister);
	354	kfree(device->kobjs[i]);
	355	device->kobjs[i] = NULL;
	356	}
	357
	358	/**
	359	* cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes
	360	* @device: the target device
	361	*/
	362	int cpuidle_add_state_sysfs(struct cpuidle_device *device)
	363	{
	364	int i, ret = -ENOMEM;
	365	struct cpuidle_state_kobj *kobj;
46bcfad7	366	struct cpuidle_driver *drv = cpuidle_get_driver();
4f86d3a8 LB	367
	368	/* state statistics */
	369	for (i = 0; i < device->state_count; i++) {
	370	kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
	371	if (!kobj)
	372	goto error_state;
46bcfad7	373	kobj->state = &drv->states[i];
4202735e	374	kobj->state_usage = &device->states_usage[i];
4f86d3a8 LB	375	init_completion(&kobj->kobj_unregister);
4f86d3a8 LB	376
e45a00d6 DL	377	ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle,
e45a00d6 DL	378	&device->kobj, "state%d", i);
4f86d3a8 LB	379	if (ret) {
	380	kfree(kobj);
	381	goto error_state;
	382	}
94f57f33	383	kobject_uevent(&kobj->kobj, KOBJ_ADD);
4f86d3a8 LB	384	device->kobjs[i] = kobj;
	385	}
	386
	387	return 0;
	388
	389	error_state:
	390	for (i = i - 1; i >= 0; i--)
	391	cpuidle_free_state_kobj(device, i);
	392	return ret;
	393	}
	394
	395	/**
	396	* cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes
	397	* @device: the target device
	398	*/
	399	void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
	400	{
	401	int i;
	402
	403	for (i = 0; i < device->state_count; i++)
	404	cpuidle_free_state_kobj(device, i);
	405	}
	406
	407	/**
	408	* cpuidle_add_sysfs - creates a sysfs instance for the target device
8a25a2fd	409	* @dev: the target device
4f86d3a8	410	*/
1aef40e2	411	int cpuidle_add_sysfs(struct cpuidle_device *dev)
4f86d3a8	412	{
1aef40e2	413	struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);
94f57f33	414	int error;
4f86d3a8	415
e45a00d6 DL	416	init_completion(&dev->kobj_unregister);
e45a00d6 DL	417
8a25a2fd	418	error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
94f57f33 GKH	419	"cpuidle");
	420	if (!error)
	421	kobject_uevent(&dev->kobj, KOBJ_ADD);
	422	return error;
4f86d3a8 LB	423	}
	424
	425	/**
	426	* cpuidle_remove_sysfs - deletes a sysfs instance on the target device
8a25a2fd	427	* @dev: the target device
4f86d3a8	428	*/
1aef40e2	429	void cpuidle_remove_sysfs(struct cpuidle_device *dev)
4f86d3a8	430	{
c10997f6	431	kobject_put(&dev->kobj);
e45a00d6	432	wait_for_completion(&dev->kobj_unregister);
4f86d3a8	433	}