forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
735 lines
19 KiB
735 lines
19 KiB
/* |
|
* 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/slab.h> |
|
#include <linux/cpu.h> |
|
#include <linux/completion.h> |
|
#include <linux/capability.h> |
|
#include <linux/device.h> |
|
#include <linux/kobject.h> |
|
|
|
#include "cpuidle.h" |
|
|
|
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 - (CPUIDLE_NAME_LEN + 2))) |
|
goto out; |
|
|
|
i += scnprintf(&buf[i], CPUIDLE_NAME_LEN + 1, "%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 *drv; |
|
|
|
spin_lock(&cpuidle_driver_lock); |
|
drv = cpuidle_get_driver(); |
|
if (drv) |
|
ret = sprintf(buf, "%s\n", drv->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 + 1]; |
|
int ret; |
|
struct cpuidle_governor *gov; |
|
|
|
ret = sscanf(buf, "%" __stringify(CPUIDLE_NAME_LEN) "s", gov_name); |
|
if (ret != 1) |
|
return -EINVAL; |
|
|
|
mutex_lock(&cpuidle_lock); |
|
ret = -EINVAL; |
|
list_for_each_entry(gov, &cpuidle_governors, governor_list) { |
|
if (!strncmp(gov->name, gov_name, CPUIDLE_NAME_LEN)) { |
|
ret = cpuidle_switch_governor(gov); |
|
break; |
|
} |
|
} |
|
mutex_unlock(&cpuidle_lock); |
|
|
|
return ret ? ret : count; |
|
} |
|
|
|
static DEVICE_ATTR(available_governors, 0444, show_available_governors, NULL); |
|
static DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL); |
|
static DEVICE_ATTR(current_governor, 0644, show_current_governor, |
|
store_current_governor); |
|
static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL); |
|
|
|
static struct attribute *cpuidle_attrs[] = { |
|
&dev_attr_available_governors.attr, |
|
&dev_attr_current_driver.attr, |
|
&dev_attr_current_governor.attr, |
|
&dev_attr_current_governor_ro.attr, |
|
NULL |
|
}; |
|
|
|
static struct attribute_group cpuidle_attr_group = { |
|
.attrs = cpuidle_attrs, |
|
.name = "cpuidle", |
|
}; |
|
|
|
/** |
|
* cpuidle_add_interface - add CPU global sysfs attributes |
|
* @dev: the target device |
|
*/ |
|
int cpuidle_add_interface(struct device *dev) |
|
{ |
|
return sysfs_create_group(&dev->kobj, &cpuidle_attr_group); |
|
} |
|
|
|
/** |
|
* cpuidle_remove_interface - remove CPU global sysfs attributes |
|
* @dev: the target device |
|
*/ |
|
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 attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr) |
|
|
|
struct cpuidle_device_kobj { |
|
struct cpuidle_device *dev; |
|
struct completion kobj_unregister; |
|
struct kobject kobj; |
|
}; |
|
|
|
static inline struct cpuidle_device *to_cpuidle_device(struct kobject *kobj) |
|
{ |
|
struct cpuidle_device_kobj *kdev = |
|
container_of(kobj, struct cpuidle_device_kobj, kobj); |
|
|
|
return kdev->dev; |
|
} |
|
|
|
static ssize_t cpuidle_show(struct kobject *kobj, struct attribute *attr, |
|
char *buf) |
|
{ |
|
int ret = -EIO; |
|
struct cpuidle_device *dev = to_cpuidle_device(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 = to_cpuidle_device(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_kobj *kdev = |
|
container_of(kobj, struct cpuidle_device_kobj, kobj); |
|
|
|
complete(&kdev->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_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 define_show_state_time_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", ktime_to_us(state->_name##_ns)); \ |
|
} |
|
|
|
define_show_state_time_function(exit_latency) |
|
define_show_state_time_function(target_residency) |
|
define_show_state_function(power_usage) |
|
define_show_state_ull_function(usage) |
|
define_show_state_ull_function(rejected) |
|
define_show_state_str_function(name) |
|
define_show_state_str_function(desc) |
|
define_show_state_ull_function(above) |
|
define_show_state_ull_function(below) |
|
|
|
static ssize_t show_state_time(struct cpuidle_state *state, |
|
struct cpuidle_state_usage *state_usage, |
|
char *buf) |
|
{ |
|
return sprintf(buf, "%llu\n", ktime_to_us(state_usage->time_ns)); |
|
} |
|
|
|
static ssize_t show_state_disable(struct cpuidle_state *state, |
|
struct cpuidle_state_usage *state_usage, |
|
char *buf) |
|
{ |
|
return sprintf(buf, "%llu\n", |
|
state_usage->disable & CPUIDLE_STATE_DISABLED_BY_USER); |
|
} |
|
|
|
static ssize_t store_state_disable(struct cpuidle_state *state, |
|
struct cpuidle_state_usage *state_usage, |
|
const char *buf, size_t size) |
|
{ |
|
unsigned int value; |
|
int err; |
|
|
|
if (!capable(CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
err = kstrtouint(buf, 0, &value); |
|
if (err) |
|
return err; |
|
|
|
if (value) |
|
state_usage->disable |= CPUIDLE_STATE_DISABLED_BY_USER; |
|
else |
|
state_usage->disable &= ~CPUIDLE_STATE_DISABLED_BY_USER; |
|
|
|
return size; |
|
} |
|
|
|
static ssize_t show_state_default_status(struct cpuidle_state *state, |
|
struct cpuidle_state_usage *state_usage, |
|
char *buf) |
|
{ |
|
return sprintf(buf, "%s\n", |
|
state->flags & CPUIDLE_FLAG_OFF ? "disabled" : "enabled"); |
|
} |
|
|
|
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(residency, show_state_target_residency); |
|
define_one_state_ro(power, show_state_power_usage); |
|
define_one_state_ro(usage, show_state_usage); |
|
define_one_state_ro(rejected, show_state_rejected); |
|
define_one_state_ro(time, show_state_time); |
|
define_one_state_rw(disable, show_state_disable, store_state_disable); |
|
define_one_state_ro(above, show_state_above); |
|
define_one_state_ro(below, show_state_below); |
|
define_one_state_ro(default_status, show_state_default_status); |
|
|
|
static struct attribute *cpuidle_state_default_attrs[] = { |
|
&attr_name.attr, |
|
&attr_desc.attr, |
|
&attr_latency.attr, |
|
&attr_residency.attr, |
|
&attr_power.attr, |
|
&attr_usage.attr, |
|
&attr_rejected.attr, |
|
&attr_time.attr, |
|
&attr_disable.attr, |
|
&attr_above.attr, |
|
&attr_below.attr, |
|
&attr_default_status.attr, |
|
NULL |
|
}; |
|
|
|
struct cpuidle_state_kobj { |
|
struct cpuidle_state *state; |
|
struct cpuidle_state_usage *state_usage; |
|
struct completion kobj_unregister; |
|
struct kobject kobj; |
|
struct cpuidle_device *device; |
|
}; |
|
|
|
#ifdef CONFIG_SUSPEND |
|
#define define_show_state_s2idle_ull_function(_name) \ |
|
static ssize_t show_state_s2idle_##_name(struct cpuidle_state *state, \ |
|
struct cpuidle_state_usage *state_usage, \ |
|
char *buf) \ |
|
{ \ |
|
return sprintf(buf, "%llu\n", state_usage->s2idle_##_name);\ |
|
} |
|
|
|
define_show_state_s2idle_ull_function(usage); |
|
define_show_state_s2idle_ull_function(time); |
|
|
|
#define define_one_state_s2idle_ro(_name, show) \ |
|
static struct cpuidle_state_attr attr_s2idle_##_name = \ |
|
__ATTR(_name, 0444, show, NULL) |
|
|
|
define_one_state_s2idle_ro(usage, show_state_s2idle_usage); |
|
define_one_state_s2idle_ro(time, show_state_s2idle_time); |
|
|
|
static struct attribute *cpuidle_state_s2idle_attrs[] = { |
|
&attr_s2idle_usage.attr, |
|
&attr_s2idle_time.attr, |
|
NULL |
|
}; |
|
|
|
static const struct attribute_group cpuidle_state_s2idle_group = { |
|
.name = "s2idle", |
|
.attrs = cpuidle_state_s2idle_attrs, |
|
}; |
|
|
|
static void cpuidle_add_s2idle_attr_group(struct cpuidle_state_kobj *kobj) |
|
{ |
|
int ret; |
|
|
|
if (!kobj->state->enter_s2idle) |
|
return; |
|
|
|
ret = sysfs_create_group(&kobj->kobj, &cpuidle_state_s2idle_group); |
|
if (ret) |
|
pr_debug("%s: sysfs attribute group not created\n", __func__); |
|
} |
|
|
|
static void cpuidle_remove_s2idle_attr_group(struct cpuidle_state_kobj *kobj) |
|
{ |
|
if (kobj->state->enter_s2idle) |
|
sysfs_remove_group(&kobj->kobj, &cpuidle_state_s2idle_group); |
|
} |
|
#else |
|
static inline void cpuidle_add_s2idle_attr_group(struct cpuidle_state_kobj *kobj) { } |
|
static inline void cpuidle_remove_s2idle_attr_group(struct cpuidle_state_kobj *kobj) { } |
|
#endif /* CONFIG_SUSPEND */ |
|
|
|
#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 kobj_to_device(k) (kobj_to_state_obj(k)->device) |
|
#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); |
|
struct cpuidle_device *dev = kobj_to_device(kobj); |
|
|
|
if (cattr->store) |
|
ret = cattr->store(state, state_usage, buf, size); |
|
|
|
/* reset poll time cache */ |
|
dev->poll_limit_ns = 0; |
|
|
|
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) |
|
{ |
|
cpuidle_remove_s2idle_attr_group(device->kobjs[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_state_sysfs - adds cpuidle states sysfs attributes |
|
* @device: the target device |
|
*/ |
|
static int cpuidle_add_state_sysfs(struct cpuidle_device *device) |
|
{ |
|
int i, ret = -ENOMEM; |
|
struct cpuidle_state_kobj *kobj; |
|
struct cpuidle_device_kobj *kdev = device->kobj_dev; |
|
struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device); |
|
|
|
/* state statistics */ |
|
for (i = 0; i < drv->state_count; i++) { |
|
kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL); |
|
if (!kobj) { |
|
ret = -ENOMEM; |
|
goto error_state; |
|
} |
|
kobj->state = &drv->states[i]; |
|
kobj->state_usage = &device->states_usage[i]; |
|
kobj->device = device; |
|
init_completion(&kobj->kobj_unregister); |
|
|
|
ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, |
|
&kdev->kobj, "state%d", i); |
|
if (ret) { |
|
kobject_put(&kobj->kobj); |
|
goto error_state; |
|
} |
|
cpuidle_add_s2idle_attr_group(kobj); |
|
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 the cpuidle states sysfs attributes |
|
* @device: the target device |
|
*/ |
|
static void cpuidle_remove_state_sysfs(struct cpuidle_device *device) |
|
{ |
|
struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device); |
|
int i; |
|
|
|
for (i = 0; i < drv->state_count; i++) |
|
cpuidle_free_state_kobj(device, i); |
|
} |
|
|
|
#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS |
|
#define kobj_to_driver_kobj(k) container_of(k, struct cpuidle_driver_kobj, kobj) |
|
#define attr_to_driver_attr(a) container_of(a, struct cpuidle_driver_attr, attr) |
|
|
|
#define define_one_driver_ro(_name, show) \ |
|
static struct cpuidle_driver_attr attr_driver_##_name = \ |
|
__ATTR(_name, 0444, show, NULL) |
|
|
|
struct cpuidle_driver_kobj { |
|
struct cpuidle_driver *drv; |
|
struct completion kobj_unregister; |
|
struct kobject kobj; |
|
}; |
|
|
|
struct cpuidle_driver_attr { |
|
struct attribute attr; |
|
ssize_t (*show)(struct cpuidle_driver *, char *); |
|
ssize_t (*store)(struct cpuidle_driver *, const char *, size_t); |
|
}; |
|
|
|
static ssize_t show_driver_name(struct cpuidle_driver *drv, char *buf) |
|
{ |
|
ssize_t ret; |
|
|
|
spin_lock(&cpuidle_driver_lock); |
|
ret = sprintf(buf, "%s\n", drv ? drv->name : "none"); |
|
spin_unlock(&cpuidle_driver_lock); |
|
|
|
return ret; |
|
} |
|
|
|
static void cpuidle_driver_sysfs_release(struct kobject *kobj) |
|
{ |
|
struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj); |
|
complete(&driver_kobj->kobj_unregister); |
|
} |
|
|
|
static ssize_t cpuidle_driver_show(struct kobject *kobj, struct attribute *attr, |
|
char *buf) |
|
{ |
|
int ret = -EIO; |
|
struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj); |
|
struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr); |
|
|
|
if (dattr->show) |
|
ret = dattr->show(driver_kobj->drv, buf); |
|
|
|
return ret; |
|
} |
|
|
|
static ssize_t cpuidle_driver_store(struct kobject *kobj, struct attribute *attr, |
|
const char *buf, size_t size) |
|
{ |
|
int ret = -EIO; |
|
struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj); |
|
struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr); |
|
|
|
if (dattr->store) |
|
ret = dattr->store(driver_kobj->drv, buf, size); |
|
|
|
return ret; |
|
} |
|
|
|
define_one_driver_ro(name, show_driver_name); |
|
|
|
static const struct sysfs_ops cpuidle_driver_sysfs_ops = { |
|
.show = cpuidle_driver_show, |
|
.store = cpuidle_driver_store, |
|
}; |
|
|
|
static struct attribute *cpuidle_driver_default_attrs[] = { |
|
&attr_driver_name.attr, |
|
NULL |
|
}; |
|
|
|
static struct kobj_type ktype_driver_cpuidle = { |
|
.sysfs_ops = &cpuidle_driver_sysfs_ops, |
|
.default_attrs = cpuidle_driver_default_attrs, |
|
.release = cpuidle_driver_sysfs_release, |
|
}; |
|
|
|
/** |
|
* cpuidle_add_driver_sysfs - adds the driver name sysfs attribute |
|
* @dev: the target device |
|
*/ |
|
static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev) |
|
{ |
|
struct cpuidle_driver_kobj *kdrv; |
|
struct cpuidle_device_kobj *kdev = dev->kobj_dev; |
|
struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); |
|
int ret; |
|
|
|
kdrv = kzalloc(sizeof(*kdrv), GFP_KERNEL); |
|
if (!kdrv) |
|
return -ENOMEM; |
|
|
|
kdrv->drv = drv; |
|
init_completion(&kdrv->kobj_unregister); |
|
|
|
ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle, |
|
&kdev->kobj, "driver"); |
|
if (ret) { |
|
kobject_put(&kdrv->kobj); |
|
return ret; |
|
} |
|
|
|
kobject_uevent(&kdrv->kobj, KOBJ_ADD); |
|
dev->kobj_driver = kdrv; |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* cpuidle_remove_driver_sysfs - removes the driver name sysfs attribute |
|
* @dev: the target device |
|
*/ |
|
static void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev) |
|
{ |
|
struct cpuidle_driver_kobj *kdrv = dev->kobj_driver; |
|
kobject_put(&kdrv->kobj); |
|
wait_for_completion(&kdrv->kobj_unregister); |
|
kfree(kdrv); |
|
} |
|
#else |
|
static inline int cpuidle_add_driver_sysfs(struct cpuidle_device *dev) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev) |
|
{ |
|
; |
|
} |
|
#endif |
|
|
|
/** |
|
* cpuidle_add_device_sysfs - adds device specific sysfs attributes |
|
* @device: the target device |
|
*/ |
|
int cpuidle_add_device_sysfs(struct cpuidle_device *device) |
|
{ |
|
int ret; |
|
|
|
ret = cpuidle_add_state_sysfs(device); |
|
if (ret) |
|
return ret; |
|
|
|
ret = cpuidle_add_driver_sysfs(device); |
|
if (ret) |
|
cpuidle_remove_state_sysfs(device); |
|
return ret; |
|
} |
|
|
|
/** |
|
* cpuidle_remove_device_sysfs : removes device specific sysfs attributes |
|
* @device : the target device |
|
*/ |
|
void cpuidle_remove_device_sysfs(struct cpuidle_device *device) |
|
{ |
|
cpuidle_remove_driver_sysfs(device); |
|
cpuidle_remove_state_sysfs(device); |
|
} |
|
|
|
/** |
|
* cpuidle_add_sysfs - creates a sysfs instance for the target device |
|
* @dev: the target device |
|
*/ |
|
int cpuidle_add_sysfs(struct cpuidle_device *dev) |
|
{ |
|
struct cpuidle_device_kobj *kdev; |
|
struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu); |
|
int error; |
|
|
|
/* |
|
* Return if cpu_device is not setup for this CPU. |
|
* |
|
* This could happen if the arch did not set up cpu_device |
|
* since this CPU is not in cpu_present mask and the |
|
* driver did not send a correct CPU mask during registration. |
|
* Without this check we would end up passing bogus |
|
* value for &cpu_dev->kobj in kobject_init_and_add() |
|
*/ |
|
if (!cpu_dev) |
|
return -ENODEV; |
|
|
|
kdev = kzalloc(sizeof(*kdev), GFP_KERNEL); |
|
if (!kdev) |
|
return -ENOMEM; |
|
kdev->dev = dev; |
|
dev->kobj_dev = kdev; |
|
|
|
init_completion(&kdev->kobj_unregister); |
|
|
|
error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj, |
|
"cpuidle"); |
|
if (error) { |
|
kobject_put(&kdev->kobj); |
|
return error; |
|
} |
|
|
|
kobject_uevent(&kdev->kobj, KOBJ_ADD); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* cpuidle_remove_sysfs - deletes a sysfs instance on the target device |
|
* @dev: the target device |
|
*/ |
|
void cpuidle_remove_sysfs(struct cpuidle_device *dev) |
|
{ |
|
struct cpuidle_device_kobj *kdev = dev->kobj_dev; |
|
|
|
kobject_put(&kdev->kobj); |
|
wait_for_completion(&kdev->kobj_unregister); |
|
kfree(kdev); |
|
}
|
|
|