linux/drivers/thermal/thermal_sysfs.c
Rafael J. Wysocki daeeb032f4 thermal: core: Move threshold out of struct thermal_trip
The threshold field in struct thermal_trip is only used internally by
the thermal core and it is better to prevent drivers from misusing it.
It also takes some space unnecessarily in the trip tables passed by
drivers to the core during thermal zone registration.

For this reason, introduce struct thermal_trip_desc as a wrapper around
struct thermal_trip, move the threshold field directly into it and make
the thermal core store struct thermal_trip_desc objects in the internal
thermal zone trip tables.  Adjust all of the code using trip tables in
the thermal core accordingly.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
2024-04-08 16:01:20 +02:00

944 lines
22 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* thermal.c - sysfs interface of thermal devices
*
* Copyright (C) 2016 Eduardo Valentin <edubezval@gmail.com>
*
* Highly based on original thermal_core.c
* Copyright (C) 2008 Intel Corp
* Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/sysfs.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/jiffies.h>
#include "thermal_core.h"
/* sys I/F for thermal zone */
static ssize_t
type_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
return sprintf(buf, "%s\n", tz->type);
}
static ssize_t
temp_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
int temperature, ret;
ret = thermal_zone_get_temp(tz, &temperature);
if (ret)
return ret;
return sprintf(buf, "%d\n", temperature);
}
static ssize_t
mode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
int enabled;
mutex_lock(&tz->lock);
enabled = thermal_zone_device_is_enabled(tz);
mutex_unlock(&tz->lock);
return sprintf(buf, "%s\n", enabled ? "enabled" : "disabled");
}
static ssize_t
mode_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
int result;
if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
result = thermal_zone_device_enable(tz);
else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
result = thermal_zone_device_disable(tz);
else
result = -EINVAL;
if (result)
return result;
return count;
}
static ssize_t
trip_point_type_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
int trip_id;
if (sscanf(attr->attr.name, "trip_point_%d_type", &trip_id) != 1)
return -EINVAL;
switch (tz->trips[trip_id].trip.type) {
case THERMAL_TRIP_CRITICAL:
return sprintf(buf, "critical\n");
case THERMAL_TRIP_HOT:
return sprintf(buf, "hot\n");
case THERMAL_TRIP_PASSIVE:
return sprintf(buf, "passive\n");
case THERMAL_TRIP_ACTIVE:
return sprintf(buf, "active\n");
default:
return sprintf(buf, "unknown\n");
}
}
static ssize_t
trip_point_temp_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
struct thermal_trip *trip;
int trip_id, ret;
int temp;
ret = kstrtoint(buf, 10, &temp);
if (ret)
return -EINVAL;
if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) != 1)
return -EINVAL;
mutex_lock(&tz->lock);
trip = &tz->trips[trip_id].trip;
if (temp != trip->temperature) {
if (tz->ops.set_trip_temp) {
ret = tz->ops.set_trip_temp(tz, trip_id, temp);
if (ret)
goto unlock;
}
thermal_zone_set_trip_temp(tz, trip, temp);
__thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
}
unlock:
mutex_unlock(&tz->lock);
return ret ? ret : count;
}
static ssize_t
trip_point_temp_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
int trip_id;
if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) != 1)
return -EINVAL;
return sprintf(buf, "%d\n", tz->trips[trip_id].trip.temperature);
}
static ssize_t
trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
struct thermal_trip *trip;
int trip_id, ret;
int hyst;
ret = kstrtoint(buf, 10, &hyst);
if (ret || hyst < 0)
return -EINVAL;
if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip_id) != 1)
return -EINVAL;
mutex_lock(&tz->lock);
trip = &tz->trips[trip_id].trip;
if (hyst != trip->hysteresis) {
trip->hysteresis = hyst;
thermal_zone_trip_updated(tz, trip);
}
mutex_unlock(&tz->lock);
return count;
}
static ssize_t
trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
int trip_id;
if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip_id) != 1)
return -EINVAL;
return sprintf(buf, "%d\n", tz->trips[trip_id].trip.hysteresis);
}
static ssize_t
policy_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
char name[THERMAL_NAME_LENGTH];
int ret;
snprintf(name, sizeof(name), "%s", buf);
ret = thermal_zone_device_set_policy(tz, name);
if (!ret)
ret = count;
return ret;
}
static ssize_t
policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
return sprintf(buf, "%s\n", tz->governor->name);
}
static ssize_t
available_policies_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
return thermal_build_list_of_policies(buf);
}
#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
static ssize_t
emul_temp_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
int ret = 0;
int temperature;
if (kstrtoint(buf, 10, &temperature))
return -EINVAL;
mutex_lock(&tz->lock);
if (!tz->ops.set_emul_temp)
tz->emul_temperature = temperature;
else
ret = tz->ops.set_emul_temp(tz, temperature);
if (!ret)
__thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
mutex_unlock(&tz->lock);
return ret ? ret : count;
}
static DEVICE_ATTR_WO(emul_temp);
#endif
static ssize_t
sustainable_power_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
if (tz->tzp)
return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
else
return -EIO;
}
static ssize_t
sustainable_power_store(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
u32 sustainable_power;
if (!tz->tzp)
return -EIO;
if (kstrtou32(buf, 10, &sustainable_power))
return -EINVAL;
tz->tzp->sustainable_power = sustainable_power;
return count;
}
#define create_s32_tzp_attr(name) \
static ssize_t \
name##_show(struct device *dev, struct device_attribute *devattr, \
char *buf) \
{ \
struct thermal_zone_device *tz = to_thermal_zone(dev); \
\
if (tz->tzp) \
return sprintf(buf, "%d\n", tz->tzp->name); \
else \
return -EIO; \
} \
\
static ssize_t \
name##_store(struct device *dev, struct device_attribute *devattr, \
const char *buf, size_t count) \
{ \
struct thermal_zone_device *tz = to_thermal_zone(dev); \
s32 value; \
\
if (!tz->tzp) \
return -EIO; \
\
if (kstrtos32(buf, 10, &value)) \
return -EINVAL; \
\
tz->tzp->name = value; \
\
return count; \
} \
static DEVICE_ATTR_RW(name)
create_s32_tzp_attr(k_po);
create_s32_tzp_attr(k_pu);
create_s32_tzp_attr(k_i);
create_s32_tzp_attr(k_d);
create_s32_tzp_attr(integral_cutoff);
create_s32_tzp_attr(slope);
create_s32_tzp_attr(offset);
#undef create_s32_tzp_attr
/*
* These are thermal zone device attributes that will always be present.
* All the attributes created for tzp (create_s32_tzp_attr) also are always
* present on the sysfs interface.
*/
static DEVICE_ATTR_RO(type);
static DEVICE_ATTR_RO(temp);
static DEVICE_ATTR_RW(policy);
static DEVICE_ATTR_RO(available_policies);
static DEVICE_ATTR_RW(sustainable_power);
/* These thermal zone device attributes are created based on conditions */
static DEVICE_ATTR_RW(mode);
/* These attributes are unconditionally added to a thermal zone */
static struct attribute *thermal_zone_dev_attrs[] = {
&dev_attr_type.attr,
&dev_attr_temp.attr,
#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
&dev_attr_emul_temp.attr,
#endif
&dev_attr_policy.attr,
&dev_attr_available_policies.attr,
&dev_attr_sustainable_power.attr,
&dev_attr_k_po.attr,
&dev_attr_k_pu.attr,
&dev_attr_k_i.attr,
&dev_attr_k_d.attr,
&dev_attr_integral_cutoff.attr,
&dev_attr_slope.attr,
&dev_attr_offset.attr,
NULL,
};
static const struct attribute_group thermal_zone_attribute_group = {
.attrs = thermal_zone_dev_attrs,
};
static struct attribute *thermal_zone_mode_attrs[] = {
&dev_attr_mode.attr,
NULL,
};
static const struct attribute_group thermal_zone_mode_attribute_group = {
.attrs = thermal_zone_mode_attrs,
};
static const struct attribute_group *thermal_zone_attribute_groups[] = {
&thermal_zone_attribute_group,
&thermal_zone_mode_attribute_group,
/* This is not NULL terminated as we create the group dynamically */
};
/**
* create_trip_attrs() - create attributes for trip points
* @tz: the thermal zone device
*
* helper function to instantiate sysfs entries for every trip
* point and its properties of a struct thermal_zone_device.
*
* Return: 0 on success, the proper error value otherwise.
*/
static int create_trip_attrs(struct thermal_zone_device *tz)
{
const struct thermal_trip_desc *td;
struct attribute **attrs;
/* This function works only for zones with at least one trip */
if (tz->num_trips <= 0)
return -EINVAL;
tz->trip_type_attrs = kcalloc(tz->num_trips, sizeof(*tz->trip_type_attrs),
GFP_KERNEL);
if (!tz->trip_type_attrs)
return -ENOMEM;
tz->trip_temp_attrs = kcalloc(tz->num_trips, sizeof(*tz->trip_temp_attrs),
GFP_KERNEL);
if (!tz->trip_temp_attrs) {
kfree(tz->trip_type_attrs);
return -ENOMEM;
}
tz->trip_hyst_attrs = kcalloc(tz->num_trips,
sizeof(*tz->trip_hyst_attrs),
GFP_KERNEL);
if (!tz->trip_hyst_attrs) {
kfree(tz->trip_type_attrs);
kfree(tz->trip_temp_attrs);
return -ENOMEM;
}
attrs = kcalloc(tz->num_trips * 3 + 1, sizeof(*attrs), GFP_KERNEL);
if (!attrs) {
kfree(tz->trip_type_attrs);
kfree(tz->trip_temp_attrs);
kfree(tz->trip_hyst_attrs);
return -ENOMEM;
}
for_each_trip_desc(tz, td) {
int indx = thermal_zone_trip_id(tz, &td->trip);
/* create trip type attribute */
snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
"trip_point_%d_type", indx);
sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
tz->trip_type_attrs[indx].attr.attr.name =
tz->trip_type_attrs[indx].name;
tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;
/* create trip temp attribute */
snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
"trip_point_%d_temp", indx);
sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
tz->trip_temp_attrs[indx].attr.attr.name =
tz->trip_temp_attrs[indx].name;
tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
if (td->trip.flags & THERMAL_TRIP_FLAG_RW_TEMP) {
tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
tz->trip_temp_attrs[indx].attr.store =
trip_point_temp_store;
}
attrs[indx + tz->num_trips] = &tz->trip_temp_attrs[indx].attr.attr;
snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
"trip_point_%d_hyst", indx);
sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
tz->trip_hyst_attrs[indx].attr.attr.name =
tz->trip_hyst_attrs[indx].name;
tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
if (td->trip.flags & THERMAL_TRIP_FLAG_RW_HYST) {
tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
tz->trip_hyst_attrs[indx].attr.store =
trip_point_hyst_store;
}
attrs[indx + tz->num_trips * 2] =
&tz->trip_hyst_attrs[indx].attr.attr;
}
attrs[tz->num_trips * 3] = NULL;
tz->trips_attribute_group.attrs = attrs;
return 0;
}
/**
* destroy_trip_attrs() - destroy attributes for trip points
* @tz: the thermal zone device
*
* helper function to free resources allocated by create_trip_attrs()
*/
static void destroy_trip_attrs(struct thermal_zone_device *tz)
{
if (!tz)
return;
kfree(tz->trip_type_attrs);
kfree(tz->trip_temp_attrs);
kfree(tz->trip_hyst_attrs);
kfree(tz->trips_attribute_group.attrs);
}
int thermal_zone_create_device_groups(struct thermal_zone_device *tz)
{
const struct attribute_group **groups;
int i, size, result;
/* we need one extra for trips and the NULL to terminate the array */
size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2;
/* This also takes care of API requirement to be NULL terminated */
groups = kcalloc(size, sizeof(*groups), GFP_KERNEL);
if (!groups)
return -ENOMEM;
for (i = 0; i < size - 2; i++)
groups[i] = thermal_zone_attribute_groups[i];
if (tz->num_trips) {
result = create_trip_attrs(tz);
if (result) {
kfree(groups);
return result;
}
groups[size - 2] = &tz->trips_attribute_group;
}
tz->device.groups = groups;
return 0;
}
void thermal_zone_destroy_device_groups(struct thermal_zone_device *tz)
{
if (!tz)
return;
if (tz->num_trips)
destroy_trip_attrs(tz);
kfree(tz->device.groups);
}
/* sys I/F for cooling device */
static ssize_t
cdev_type_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_cooling_device *cdev = to_cooling_device(dev);
return sprintf(buf, "%s\n", cdev->type);
}
static ssize_t max_state_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct thermal_cooling_device *cdev = to_cooling_device(dev);
return sprintf(buf, "%ld\n", cdev->max_state);
}
static ssize_t cur_state_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct thermal_cooling_device *cdev = to_cooling_device(dev);
unsigned long state;
int ret;
ret = cdev->ops->get_cur_state(cdev, &state);
if (ret)
return ret;
return sprintf(buf, "%ld\n", state);
}
static ssize_t
cur_state_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct thermal_cooling_device *cdev = to_cooling_device(dev);
unsigned long state;
int result;
if (sscanf(buf, "%ld\n", &state) != 1)
return -EINVAL;
if ((long)state < 0)
return -EINVAL;
/* Requested state should be less than max_state + 1 */
if (state > cdev->max_state)
return -EINVAL;
mutex_lock(&cdev->lock);
result = cdev->ops->set_cur_state(cdev, state);
if (!result)
thermal_cooling_device_stats_update(cdev, state);
mutex_unlock(&cdev->lock);
return result ? result : count;
}
static struct device_attribute
dev_attr_cdev_type = __ATTR(type, 0444, cdev_type_show, NULL);
static DEVICE_ATTR_RO(max_state);
static DEVICE_ATTR_RW(cur_state);
static struct attribute *cooling_device_attrs[] = {
&dev_attr_cdev_type.attr,
&dev_attr_max_state.attr,
&dev_attr_cur_state.attr,
NULL,
};
static const struct attribute_group cooling_device_attr_group = {
.attrs = cooling_device_attrs,
};
static const struct attribute_group *cooling_device_attr_groups[] = {
&cooling_device_attr_group,
NULL, /* Space allocated for cooling_device_stats_attr_group */
NULL,
};
#ifdef CONFIG_THERMAL_STATISTICS
struct cooling_dev_stats {
spinlock_t lock;
unsigned int total_trans;
unsigned long state;
ktime_t last_time;
ktime_t *time_in_state;
unsigned int *trans_table;
};
static void update_time_in_state(struct cooling_dev_stats *stats)
{
ktime_t now = ktime_get(), delta;
delta = ktime_sub(now, stats->last_time);
stats->time_in_state[stats->state] =
ktime_add(stats->time_in_state[stats->state], delta);
stats->last_time = now;
}
void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
unsigned long new_state)
{
struct cooling_dev_stats *stats = cdev->stats;
lockdep_assert_held(&cdev->lock);
if (!stats)
return;
spin_lock(&stats->lock);
if (stats->state == new_state)
goto unlock;
update_time_in_state(stats);
stats->trans_table[stats->state * (cdev->max_state + 1) + new_state]++;
stats->state = new_state;
stats->total_trans++;
unlock:
spin_unlock(&stats->lock);
}
static ssize_t total_trans_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct thermal_cooling_device *cdev = to_cooling_device(dev);
struct cooling_dev_stats *stats;
int ret = 0;
mutex_lock(&cdev->lock);
stats = cdev->stats;
if (!stats)
goto unlock;
spin_lock(&stats->lock);
ret = sprintf(buf, "%u\n", stats->total_trans);
spin_unlock(&stats->lock);
unlock:
mutex_unlock(&cdev->lock);
return ret;
}
static ssize_t
time_in_state_ms_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct thermal_cooling_device *cdev = to_cooling_device(dev);
struct cooling_dev_stats *stats;
ssize_t len = 0;
int i;
mutex_lock(&cdev->lock);
stats = cdev->stats;
if (!stats)
goto unlock;
spin_lock(&stats->lock);
update_time_in_state(stats);
for (i = 0; i <= cdev->max_state; i++) {
len += sprintf(buf + len, "state%u\t%llu\n", i,
ktime_to_ms(stats->time_in_state[i]));
}
spin_unlock(&stats->lock);
unlock:
mutex_unlock(&cdev->lock);
return len;
}
static ssize_t
reset_store(struct device *dev, struct device_attribute *attr, const char *buf,
size_t count)
{
struct thermal_cooling_device *cdev = to_cooling_device(dev);
struct cooling_dev_stats *stats;
int i, states;
mutex_lock(&cdev->lock);
stats = cdev->stats;
if (!stats)
goto unlock;
states = cdev->max_state + 1;
spin_lock(&stats->lock);
stats->total_trans = 0;
stats->last_time = ktime_get();
memset(stats->trans_table, 0,
states * states * sizeof(*stats->trans_table));
for (i = 0; i < states; i++)
stats->time_in_state[i] = ktime_set(0, 0);
spin_unlock(&stats->lock);
unlock:
mutex_unlock(&cdev->lock);
return count;
}
static ssize_t trans_table_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct thermal_cooling_device *cdev = to_cooling_device(dev);
struct cooling_dev_stats *stats;
ssize_t len = 0;
int i, j;
mutex_lock(&cdev->lock);
stats = cdev->stats;
if (!stats) {
len = -ENODATA;
goto unlock;
}
len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n");
len += snprintf(buf + len, PAGE_SIZE - len, " : ");
for (i = 0; i <= cdev->max_state; i++) {
if (len >= PAGE_SIZE)
break;
len += snprintf(buf + len, PAGE_SIZE - len, "state%2u ", i);
}
if (len >= PAGE_SIZE) {
len = PAGE_SIZE;
goto unlock;
}
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
for (i = 0; i <= cdev->max_state; i++) {
if (len >= PAGE_SIZE)
break;
len += snprintf(buf + len, PAGE_SIZE - len, "state%2u:", i);
for (j = 0; j <= cdev->max_state; j++) {
if (len >= PAGE_SIZE)
break;
len += snprintf(buf + len, PAGE_SIZE - len, "%8u ",
stats->trans_table[i * (cdev->max_state + 1) + j]);
}
if (len >= PAGE_SIZE)
break;
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
}
if (len >= PAGE_SIZE) {
pr_warn_once("Thermal transition table exceeds PAGE_SIZE. Disabling\n");
len = -EFBIG;
}
unlock:
mutex_unlock(&cdev->lock);
return len;
}
static DEVICE_ATTR_RO(total_trans);
static DEVICE_ATTR_RO(time_in_state_ms);
static DEVICE_ATTR_WO(reset);
static DEVICE_ATTR_RO(trans_table);
static struct attribute *cooling_device_stats_attrs[] = {
&dev_attr_total_trans.attr,
&dev_attr_time_in_state_ms.attr,
&dev_attr_reset.attr,
&dev_attr_trans_table.attr,
NULL
};
static const struct attribute_group cooling_device_stats_attr_group = {
.attrs = cooling_device_stats_attrs,
.name = "stats"
};
static void cooling_device_stats_setup(struct thermal_cooling_device *cdev)
{
const struct attribute_group *stats_attr_group = NULL;
struct cooling_dev_stats *stats;
/* Total number of states is highest state + 1 */
unsigned long states = cdev->max_state + 1;
int var;
var = sizeof(*stats);
var += sizeof(*stats->time_in_state) * states;
var += sizeof(*stats->trans_table) * states * states;
stats = kzalloc(var, GFP_KERNEL);
if (!stats)
goto out;
stats->time_in_state = (ktime_t *)(stats + 1);
stats->trans_table = (unsigned int *)(stats->time_in_state + states);
cdev->stats = stats;
stats->last_time = ktime_get();
spin_lock_init(&stats->lock);
stats_attr_group = &cooling_device_stats_attr_group;
out:
/* Fill the empty slot left in cooling_device_attr_groups */
var = ARRAY_SIZE(cooling_device_attr_groups) - 2;
cooling_device_attr_groups[var] = stats_attr_group;
}
static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev)
{
kfree(cdev->stats);
cdev->stats = NULL;
}
#else
static inline void
cooling_device_stats_setup(struct thermal_cooling_device *cdev) {}
static inline void
cooling_device_stats_destroy(struct thermal_cooling_device *cdev) {}
#endif /* CONFIG_THERMAL_STATISTICS */
void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev)
{
cooling_device_stats_setup(cdev);
cdev->device.groups = cooling_device_attr_groups;
}
void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev)
{
cooling_device_stats_destroy(cdev);
}
void thermal_cooling_device_stats_reinit(struct thermal_cooling_device *cdev)
{
lockdep_assert_held(&cdev->lock);
cooling_device_stats_destroy(cdev);
cooling_device_stats_setup(cdev);
}
/* these helper will be used only at the time of bindig */
ssize_t
trip_point_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_instance *instance;
instance =
container_of(attr, struct thermal_instance, attr);
return sprintf(buf, "%d\n",
thermal_zone_trip_id(instance->tz, instance->trip));
}
ssize_t
weight_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_instance *instance;
instance = container_of(attr, struct thermal_instance, weight_attr);
return sprintf(buf, "%d\n", instance->weight);
}
ssize_t weight_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct thermal_instance *instance;
int ret, weight;
ret = kstrtoint(buf, 0, &weight);
if (ret)
return ret;
instance = container_of(attr, struct thermal_instance, weight_attr);
/* Don't race with governors using the 'weight' value */
mutex_lock(&instance->tz->lock);
instance->weight = weight;
thermal_governor_update_tz(instance->tz,
THERMAL_INSTANCE_WEIGHT_CHANGED);
mutex_unlock(&instance->tz->lock);
return count;
}