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path: root/drivers/thermal/thermal_core.c
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Diffstat (limited to 'drivers/thermal/thermal_core.c')
-rw-r--r--drivers/thermal/thermal_core.c314
1 files changed, 297 insertions, 17 deletions
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 4108db7e10c1..04659bfb888b 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -75,6 +75,58 @@ static struct thermal_governor *__find_governor(const char *name)
return NULL;
}
+/**
+ * bind_previous_governor() - bind the previous governor of the thermal zone
+ * @tz: a valid pointer to a struct thermal_zone_device
+ * @failed_gov_name: the name of the governor that failed to register
+ *
+ * Register the previous governor of the thermal zone after a new
+ * governor has failed to be bound.
+ */
+static void bind_previous_governor(struct thermal_zone_device *tz,
+ const char *failed_gov_name)
+{
+ if (tz->governor && tz->governor->bind_to_tz) {
+ if (tz->governor->bind_to_tz(tz)) {
+ dev_err(&tz->device,
+ "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
+ failed_gov_name, tz->governor->name, tz->type);
+ tz->governor = NULL;
+ }
+ }
+}
+
+/**
+ * thermal_set_governor() - Switch to another governor
+ * @tz: a valid pointer to a struct thermal_zone_device
+ * @new_gov: pointer to the new governor
+ *
+ * Change the governor of thermal zone @tz.
+ *
+ * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
+ */
+static int thermal_set_governor(struct thermal_zone_device *tz,
+ struct thermal_governor *new_gov)
+{
+ int ret = 0;
+
+ if (tz->governor && tz->governor->unbind_from_tz)
+ tz->governor->unbind_from_tz(tz);
+
+ if (new_gov && new_gov->bind_to_tz) {
+ ret = new_gov->bind_to_tz(tz);
+ if (ret) {
+ bind_previous_governor(tz, new_gov->name);
+
+ return ret;
+ }
+ }
+
+ tz->governor = new_gov;
+
+ return ret;
+}
+
int thermal_register_governor(struct thermal_governor *governor)
{
int err;
@@ -107,8 +159,15 @@ int thermal_register_governor(struct thermal_governor *governor)
name = pos->tzp->governor_name;
- if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH))
- pos->governor = governor;
+ if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
+ int ret;
+
+ ret = thermal_set_governor(pos, governor);
+ if (ret)
+ dev_err(&pos->device,
+ "Failed to set governor %s for thermal zone %s: %d\n",
+ governor->name, pos->type, ret);
+ }
}
mutex_unlock(&thermal_list_lock);
@@ -134,7 +193,7 @@ void thermal_unregister_governor(struct thermal_governor *governor)
list_for_each_entry(pos, &thermal_tz_list, node) {
if (!strncasecmp(pos->governor->name, governor->name,
THERMAL_NAME_LENGTH))
- pos->governor = NULL;
+ thermal_set_governor(pos, NULL);
}
mutex_unlock(&thermal_list_lock);
@@ -218,7 +277,8 @@ static void print_bind_err_msg(struct thermal_zone_device *tz,
static void __bind(struct thermal_zone_device *tz, int mask,
struct thermal_cooling_device *cdev,
- unsigned long *limits)
+ unsigned long *limits,
+ unsigned int weight)
{
int i, ret;
@@ -233,7 +293,8 @@ static void __bind(struct thermal_zone_device *tz, int mask,
upper = limits[i * 2 + 1];
}
ret = thermal_zone_bind_cooling_device(tz, i, cdev,
- upper, lower);
+ upper, lower,
+ weight);
if (ret)
print_bind_err_msg(tz, cdev, ret);
}
@@ -280,7 +341,8 @@ static void bind_cdev(struct thermal_cooling_device *cdev)
continue;
tzp->tbp[i].cdev = cdev;
__bind(pos, tzp->tbp[i].trip_mask, cdev,
- tzp->tbp[i].binding_limits);
+ tzp->tbp[i].binding_limits,
+ tzp->tbp[i].weight);
}
}
@@ -319,7 +381,8 @@ static void bind_tz(struct thermal_zone_device *tz)
continue;
tzp->tbp[i].cdev = pos;
__bind(tz, tzp->tbp[i].trip_mask, pos,
- tzp->tbp[i].binding_limits);
+ tzp->tbp[i].binding_limits,
+ tzp->tbp[i].weight);
}
}
exit:
@@ -713,7 +776,8 @@ passive_store(struct device *dev, struct device_attribute *attr,
thermal_zone_bind_cooling_device(tz,
THERMAL_TRIPS_NONE, cdev,
THERMAL_NO_LIMIT,
- THERMAL_NO_LIMIT);
+ THERMAL_NO_LIMIT,
+ THERMAL_WEIGHT_DEFAULT);
}
mutex_unlock(&thermal_list_lock);
if (!tz->passive_delay)
@@ -765,8 +829,9 @@ policy_store(struct device *dev, struct device_attribute *attr,
if (!gov)
goto exit;
- tz->governor = gov;
- ret = count;
+ ret = thermal_set_governor(tz, gov);
+ if (!ret)
+ ret = count;
exit:
mutex_unlock(&tz->lock);
@@ -810,6 +875,158 @@ emul_temp_store(struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
#endif/*CONFIG_THERMAL_EMULATION*/
+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;
+}
+static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
+ sustainable_power_store);
+
+#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, "%u\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(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
+
+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
+
+static struct device_attribute *dev_tzp_attrs[] = {
+ &dev_attr_sustainable_power,
+ &dev_attr_k_po,
+ &dev_attr_k_pu,
+ &dev_attr_k_i,
+ &dev_attr_k_d,
+ &dev_attr_integral_cutoff,
+ &dev_attr_slope,
+ &dev_attr_offset,
+};
+
+static int create_tzp_attrs(struct device *dev)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
+ int ret;
+ struct device_attribute *dev_attr = dev_tzp_attrs[i];
+
+ ret = device_create_file(dev, dev_attr);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * power_actor_get_max_power() - get the maximum power that a cdev can consume
+ * @cdev: pointer to &thermal_cooling_device
+ * @tz: a valid thermal zone device pointer
+ * @max_power: pointer in which to store the maximum power
+ *
+ * Calculate the maximum power consumption in milliwats that the
+ * cooling device can currently consume and store it in @max_power.
+ *
+ * Return: 0 on success, -EINVAL if @cdev doesn't support the
+ * power_actor API or -E* on other error.
+ */
+int power_actor_get_max_power(struct thermal_cooling_device *cdev,
+ struct thermal_zone_device *tz, u32 *max_power)
+{
+ if (!cdev_is_power_actor(cdev))
+ return -EINVAL;
+
+ return cdev->ops->state2power(cdev, tz, 0, max_power);
+}
+
+/**
+ * power_actor_set_power() - limit the maximum power that a cooling device can consume
+ * @cdev: pointer to &thermal_cooling_device
+ * @instance: thermal instance to update
+ * @power: the power in milliwatts
+ *
+ * Set the cooling device to consume at most @power milliwatts.
+ *
+ * Return: 0 on success, -EINVAL if the cooling device does not
+ * implement the power actor API or -E* for other failures.
+ */
+int power_actor_set_power(struct thermal_cooling_device *cdev,
+ struct thermal_instance *instance, u32 power)
+{
+ unsigned long state;
+ int ret;
+
+ if (!cdev_is_power_actor(cdev))
+ return -EINVAL;
+
+ ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
+ if (ret)
+ return ret;
+
+ instance->target = state;
+ cdev->updated = false;
+ thermal_cdev_update(cdev);
+
+ return 0;
+}
+
static DEVICE_ATTR(type, 0444, type_show, NULL);
static DEVICE_ATTR(temp, 0444, temp_show, NULL);
static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
@@ -917,6 +1134,34 @@ static const struct attribute_group *cooling_device_attr_groups[] = {
NULL,
};
+static ssize_t
+thermal_cooling_device_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);
+}
+
+static ssize_t
+thermal_cooling_device_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);
+ instance->weight = weight;
+
+ return count;
+}
/* Device management */
/**
@@ -931,6 +1176,9 @@ static const struct attribute_group *cooling_device_attr_groups[] = {
* @lower: the Minimum cooling state can be used for this trip point.
* THERMAL_NO_LIMIT means no lower limit,
* and the cooling device can be in cooling state 0.
+ * @weight: The weight of the cooling device to be bound to the
+ * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
+ * default value
*
* This interface function bind a thermal cooling device to the certain trip
* point of a thermal zone device.
@@ -941,7 +1189,8 @@ static const struct attribute_group *cooling_device_attr_groups[] = {
int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
int trip,
struct thermal_cooling_device *cdev,
- unsigned long upper, unsigned long lower)
+ unsigned long upper, unsigned long lower,
+ unsigned int weight)
{
struct thermal_instance *dev;
struct thermal_instance *pos;
@@ -986,6 +1235,7 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
dev->upper = upper;
dev->lower = lower;
dev->target = THERMAL_NO_TARGET;
+ dev->weight = weight;
result = get_idr(&tz->idr, &tz->lock, &dev->id);
if (result)
@@ -1006,6 +1256,16 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
if (result)
goto remove_symbol_link;
+ sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
+ sysfs_attr_init(&dev->weight_attr.attr);
+ dev->weight_attr.attr.name = dev->weight_attr_name;
+ dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
+ dev->weight_attr.show = thermal_cooling_device_weight_show;
+ dev->weight_attr.store = thermal_cooling_device_weight_store;
+ result = device_create_file(&tz->device, &dev->weight_attr);
+ if (result)
+ goto remove_trip_file;
+
mutex_lock(&tz->lock);
mutex_lock(&cdev->lock);
list_for_each_entry(pos, &tz->thermal_instances, tz_node)
@@ -1023,6 +1283,8 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
if (!result)
return 0;
+ device_remove_file(&tz->device, &dev->weight_attr);
+remove_trip_file:
device_remove_file(&tz->device, &dev->attr);
remove_symbol_link:
sysfs_remove_link(&tz->device.kobj, dev->name);
@@ -1377,7 +1639,8 @@ static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
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 (mask & (1 << indx)) {
+ if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
+ mask & (1 << indx)) {
tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
tz->trip_temp_attrs[indx].attr.store =
trip_point_temp_store;
@@ -1454,7 +1717,7 @@ static void remove_trip_attrs(struct thermal_zone_device *tz)
struct thermal_zone_device *thermal_zone_device_register(const char *type,
int trips, int mask, void *devdata,
struct thermal_zone_device_ops *ops,
- const struct thermal_zone_params *tzp,
+ struct thermal_zone_params *tzp,
int passive_delay, int polling_delay)
{
struct thermal_zone_device *tz;
@@ -1462,6 +1725,7 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
int result;
int count;
int passive = 0;
+ struct thermal_governor *governor;
if (type && strlen(type) >= THERMAL_NAME_LENGTH)
return ERR_PTR(-EINVAL);
@@ -1548,13 +1812,24 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
if (result)
goto unregister;
+ /* Add thermal zone params */
+ result = create_tzp_attrs(&tz->device);
+ if (result)
+ goto unregister;
+
/* Update 'this' zone's governor information */
mutex_lock(&thermal_governor_lock);
if (tz->tzp)
- tz->governor = __find_governor(tz->tzp->governor_name);
+ governor = __find_governor(tz->tzp->governor_name);
else
- tz->governor = def_governor;
+ governor = def_governor;
+
+ result = thermal_set_governor(tz, governor);
+ if (result) {
+ mutex_unlock(&thermal_governor_lock);
+ goto unregister;
+ }
mutex_unlock(&thermal_governor_lock);
@@ -1643,7 +1918,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
device_remove_file(&tz->device, &dev_attr_mode);
device_remove_file(&tz->device, &dev_attr_policy);
remove_trip_attrs(tz);
- tz->governor = NULL;
+ thermal_set_governor(tz, NULL);
thermal_remove_hwmon_sysfs(tz);
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
@@ -1799,7 +2074,11 @@ static int __init thermal_register_governors(void)
if (result)
return result;
- return thermal_gov_user_space_register();
+ result = thermal_gov_user_space_register();
+ if (result)
+ return result;
+
+ return thermal_gov_power_allocator_register();
}
static void thermal_unregister_governors(void)
@@ -1808,6 +2087,7 @@ static void thermal_unregister_governors(void)
thermal_gov_fair_share_unregister();
thermal_gov_bang_bang_unregister();
thermal_gov_user_space_unregister();
+ thermal_gov_power_allocator_unregister();
}
static int __init thermal_init(void)
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-06 17:17:46 +0300