Re: [PATCH v7 01/29] thermal/core: Add a generic thermal_zone_get_trip() function

From: Rafael J. Wysocki
Date: Fri Sep 30 2022 - 13:21:16 EST

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In reply to: Daniel Lezcano: "[PATCH v7 01/29] thermal/core: Add a generic thermal_zone_get_trip() function"
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On Wed, Sep 28, 2022 at 11:01 PM Daniel Lezcano
<daniel.lezcano@xxxxxxxxxx> wrote:
>
> The thermal_zone_device_ops structure defines a set of ops family,
> get_trip_temp(), get_trip_hyst(), get_trip_type(). Each of them is
> returning a property of a trip point.
>
> The result is the code is calling the ops everywhere to get a trip
> point which is supposed to be defined in the backend driver. It is a
> non-sense as a thermal trip can be generic and used by the backend
> driver to declare its trip points.
>
> Part of the thermal framework has been changed and all the OF thermal
> drivers are using the same definition for the trip point and use a
> thermal zone registration variant to pass those trip points which are
> part of the thermal zone device structure.
>
> Consequently, we can use a generic function to get the trip points
> when they are stored in the thermal zone device structure.
>
> This approach can be generalized to all the drivers and we can get rid
> of the ops->get_trip_*. That will result to a much more simpler code
> and make possible to rework how the thermal trip are handled in the
> thermal core framework as discussed previously.
>
> This change adds a function thermal_zone_get_trip() where we get the
> thermal trip point structure which contains all the properties (type,
> temp, hyst) instead of doing multiple calls to ops->get_trip_*.
>
> That opens the door for trip point extension with more attributes. For
> instance, replacing the trip points disabled bitmask with a 'disabled'
> field in the structure.
>
> Here we replace all the calls to ops->get_trip_* in the thermal core
> code with a call to the thermal_zone_get_trip() function.
>
> The thermal zone ops defines a callback to retrieve the critical
> temperature. As the trip handling is being reworked, all the trip
> points will be the same whatever the driver and consequently finding
> the critical trip temperature will be just a loop to search for a
> critical trip point type.
>
> Provide such a generic function, so we encapsulate the ops
> get_crit_temp() which can be removed when all the backend drivers are
> using the generic trip points handling.
>
> While at it, add the thermal_zone_get_num_trips() to encapsulate the
> code more and reduce the grip with the thermal framework internals.
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
> Reviewed-by: Zhang Rui <rui.zhang@xxxxxxxxx>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

> ---
> drivers/thermal/thermal_core.c | 114 ++++++++++++++++++++++++------
> drivers/thermal/thermal_core.h | 2 +
> drivers/thermal/thermal_helpers.c | 28 ++++----
> drivers/thermal/thermal_netlink.c | 21 +++---
> drivers/thermal/thermal_sysfs.c | 66 +++++++----------
> include/linux/thermal.h | 7 ++
> 6 files changed, 149 insertions(+), 89 deletions(-)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index 4eab77d0e59c..16ef91dc102f 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -341,35 +341,31 @@ static void handle_critical_trips(struct thermal_zone_device *tz,
> tz->ops->critical(tz);
> }
>
> -static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
> +static void handle_thermal_trip(struct thermal_zone_device *tz, int trip_id)
> {
> - enum thermal_trip_type type;
> - int trip_temp, hyst = 0;
> + struct thermal_trip trip;
>
> /* Ignore disabled trip points */
> - if (test_bit(trip, &tz->trips_disabled))
> + if (test_bit(trip_id, &tz->trips_disabled))
> return;
>
> - tz->ops->get_trip_temp(tz, trip, &trip_temp);
> - tz->ops->get_trip_type(tz, trip, &type);
> - if (tz->ops->get_trip_hyst)
> - tz->ops->get_trip_hyst(tz, trip, &hyst);
> + __thermal_zone_get_trip(tz, trip_id, &trip);
>
> if (tz->last_temperature != THERMAL_TEMP_INVALID) {
> - if (tz->last_temperature < trip_temp &&
> - tz->temperature >= trip_temp)
> - thermal_notify_tz_trip_up(tz->id, trip,
> + if (tz->last_temperature < trip.temperature &&
> + tz->temperature >= trip.temperature)
> + thermal_notify_tz_trip_up(tz->id, trip_id,
> tz->temperature);
> - if (tz->last_temperature >= trip_temp &&
> - tz->temperature < (trip_temp - hyst))
> - thermal_notify_tz_trip_down(tz->id, trip,
> + if (tz->last_temperature >= trip.temperature &&
> + tz->temperature < (trip.temperature - trip.hysteresis))
> + thermal_notify_tz_trip_down(tz->id, trip_id,
> tz->temperature);
> }
>
> - if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
> - handle_critical_trips(tz, trip, trip_temp, type);
> + if (trip.type == THERMAL_TRIP_CRITICAL || trip.type == THERMAL_TRIP_HOT)
> + handle_critical_trips(tz, trip_id, trip.temperature, trip.type);
> else
> - handle_non_critical_trips(tz, trip);
> + handle_non_critical_trips(tz, trip_id);
> }
>
> static void update_temperature(struct thermal_zone_device *tz)
> @@ -1142,6 +1138,79 @@ static void thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms
> *delay_jiffies = round_jiffies(*delay_jiffies);
> }
>
> +int thermal_zone_get_num_trips(struct thermal_zone_device *tz)
> +{
> + return tz->num_trips;
> +}
> +EXPORT_SYMBOL_GPL(thermal_zone_get_num_trips);
> +
> +int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp)
> +{
> + int i, ret = -EINVAL;
> +
> + if (tz->ops->get_crit_temp)
> + return tz->ops->get_crit_temp(tz, temp);
> +
> + if (!tz->trips)
> + return -EINVAL;
> +
> + mutex_lock(&tz->lock);
> +
> + for (i = 0; i < tz->num_trips; i++) {
> + if (tz->trips[i].type == THERMAL_TRIP_CRITICAL) {
> + *temp = tz->trips[i].temperature;
> + ret = 0;
> + break;
> + }
> + }
> +
> + mutex_unlock(&tz->lock);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(thermal_zone_get_crit_temp);
> +
> +int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
> + struct thermal_trip *trip)
> +{
> + int ret;
> +
> + if (!tz || trip_id < 0 || trip_id >= tz->num_trips || !trip)
> + return -EINVAL;
> +
> + if (tz->trips) {
> + *trip = tz->trips[trip_id];
> + return 0;
> + }
> +
> + if (tz->ops->get_trip_hyst) {
> + ret = tz->ops->get_trip_hyst(tz, trip_id, &trip->hysteresis);
> + if (ret)
> + return ret;
> + } else {
> + trip->hysteresis = 0;
> + }
> +
> + ret = tz->ops->get_trip_temp(tz, trip_id, &trip->temperature);
> + if (ret)
> + return ret;
> +
> + return tz->ops->get_trip_type(tz, trip_id, &trip->type);
> +}
> +
> +int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
> + struct thermal_trip *trip)
> +{
> + int ret;
> +
> + mutex_lock(&tz->lock);
> + ret = __thermal_zone_get_trip(tz, trip_id, trip);
> + mutex_unlock(&tz->lock);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(thermal_zone_get_trip);
> +
> /**
> * thermal_zone_device_register_with_trips() - register a new thermal zone device
> * @type: the thermal zone device type
> @@ -1174,8 +1243,6 @@ thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *t
> int polling_delay)
> {
> struct thermal_zone_device *tz;
> - enum thermal_trip_type trip_type;
> - int trip_temp;
> int id;
> int result;
> int count;
> @@ -1202,7 +1269,7 @@ thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *t
> return ERR_PTR(-EINVAL);
> }
>
> - if (num_trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
> + if (num_trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp) && !trips)
> return ERR_PTR(-EINVAL);
>
> tz = kzalloc(sizeof(*tz), GFP_KERNEL);
> @@ -1252,9 +1319,10 @@ thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *t
> goto release_device;
>
> for (count = 0; count < num_trips; count++) {
> - if (tz->ops->get_trip_type(tz, count, &trip_type) ||
> - tz->ops->get_trip_temp(tz, count, &trip_temp) ||
> - !trip_temp)
> + struct thermal_trip trip;
> +
> + result = thermal_zone_get_trip(tz, count, &trip);
> + if (result)
> set_bit(count, &tz->trips_disabled);
> }
>
> diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
> index 1571917bd3c8..879e91a48435 100644
> --- a/drivers/thermal/thermal_core.h
> +++ b/drivers/thermal/thermal_core.h
> @@ -113,6 +113,8 @@ int thermal_build_list_of_policies(char *buf);
> /* Helpers */
> void thermal_zone_set_trips(struct thermal_zone_device *tz);
> void __thermal_zone_set_trips(struct thermal_zone_device *tz);
> +int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
> + struct thermal_trip *trip);
> int __thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
>
> /* sysfs I/F */
> diff --git a/drivers/thermal/thermal_helpers.c b/drivers/thermal/thermal_helpers.c
> index c65cdce8f856..06dded36e95e 100644
> --- a/drivers/thermal/thermal_helpers.c
> +++ b/drivers/thermal/thermal_helpers.c
> @@ -69,7 +69,7 @@ int __thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
> int ret = -EINVAL;
> int count;
> int crit_temp = INT_MAX;
> - enum thermal_trip_type type;
> + struct thermal_trip trip;
>
> lockdep_assert_held(&tz->lock);
>
> @@ -80,10 +80,9 @@ int __thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
>
> if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
> for (count = 0; count < tz->num_trips; count++) {
> - ret = tz->ops->get_trip_type(tz, count, &type);
> - if (!ret && type == THERMAL_TRIP_CRITICAL) {
> - ret = tz->ops->get_trip_temp(tz, count,
> - &crit_temp);
> + ret = __thermal_zone_get_trip(tz, count, &trip);
> + if (!ret && trip.type == THERMAL_TRIP_CRITICAL) {
> + crit_temp = trip.temperature;
> break;
> }
> }
> @@ -124,29 +123,30 @@ EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
>
> void __thermal_zone_set_trips(struct thermal_zone_device *tz)
> {
> - int low = -INT_MAX;
> - int high = INT_MAX;
> - int trip_temp, hysteresis;
> + struct thermal_trip trip;
> + int low = -INT_MAX, high = INT_MAX;
> int i, ret;
>
> lockdep_assert_held(&tz->lock);
>
> - if (!tz->ops->set_trips || !tz->ops->get_trip_hyst)
> + if (!tz->ops->set_trips)
> return;
>
> for (i = 0; i < tz->num_trips; i++) {
> int trip_low;
>
> - tz->ops->get_trip_temp(tz, i, &trip_temp);
> - tz->ops->get_trip_hyst(tz, i, &hysteresis);
> + ret = __thermal_zone_get_trip(tz, i , &trip);
> + if (ret)
> + return;
>
> - trip_low = trip_temp - hysteresis;
> + trip_low = trip.temperature - trip.hysteresis;
>
> if (trip_low < tz->temperature && trip_low > low)
> low = trip_low;
>
> - if (trip_temp > tz->temperature && trip_temp < high)
> - high = trip_temp;
> + if (trip.temperature > tz->temperature &&
> + trip.temperature < high)
> + high = trip.temperature;
> }
>
> /* No need to change trip points */
> diff --git a/drivers/thermal/thermal_netlink.c b/drivers/thermal/thermal_netlink.c
> index 050d243a5fa1..2a3190d55358 100644
> --- a/drivers/thermal/thermal_netlink.c
> +++ b/drivers/thermal/thermal_netlink.c
> @@ -452,7 +452,8 @@ static int thermal_genl_cmd_tz_get_trip(struct param *p)
> struct sk_buff *msg = p->msg;
> struct thermal_zone_device *tz;
> struct nlattr *start_trip;
> - int i, id;
> + struct thermal_trip trip;
> + int ret, i, id;
>
> if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID])
> return -EINVAL;
> @@ -471,18 +472,14 @@ static int thermal_genl_cmd_tz_get_trip(struct param *p)
>
> for (i = 0; i < tz->num_trips; i++) {
>
> - enum thermal_trip_type type;
> - int temp, hyst = 0;
> -
> - tz->ops->get_trip_type(tz, i, &type);
> - tz->ops->get_trip_temp(tz, i, &temp);
> - if (tz->ops->get_trip_hyst)
> - tz->ops->get_trip_hyst(tz, i, &hyst);
> -
> + ret = __thermal_zone_get_trip(tz, i, &trip);
> + if (ret)
> + goto out_cancel_nest;
> +
> if (nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_ID, i) ||
> - nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_TYPE, type) ||
> - nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_TEMP, temp) ||
> - nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_HYST, hyst))
> + nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_TYPE, trip.type) ||
> + nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_TEMP, trip.temperature) ||
> + nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_HYST, trip.hysteresis))
> goto out_cancel_nest;
> }
>
> diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c
> index ec495c7dff03..d093d7aa64c6 100644
> --- a/drivers/thermal/thermal_sysfs.c
> +++ b/drivers/thermal/thermal_sysfs.c
> @@ -83,20 +83,17 @@ trip_point_type_show(struct device *dev, struct device_attribute *attr,
> char *buf)
> {
> struct thermal_zone_device *tz = to_thermal_zone(dev);
> - enum thermal_trip_type type;
> - int trip, result;
> + struct thermal_trip trip;
> + int trip_id, result;
>
> - if (!tz->ops->get_trip_type)
> - return -EPERM;
> -
> - if (sscanf(attr->attr.name, "trip_point_%d_type", &trip) != 1)
> + if (sscanf(attr->attr.name, "trip_point_%d_type", &trip_id) != 1)
> return -EINVAL;
>
> - result = tz->ops->get_trip_type(tz, trip, &type);
> + result = thermal_zone_get_trip(tz, trip_id, &trip);
> if (result)
> return result;
>
> - switch (type) {
> + switch (trip.type) {
> case THERMAL_TRIP_CRITICAL:
> return sprintf(buf, "critical\n");
> case THERMAL_TRIP_HOT:
> @@ -115,39 +112,33 @@ 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);
> - int trip, ret;
> - int temperature, hyst = 0;
> - enum thermal_trip_type type;
> + struct thermal_trip trip;
> + int trip_id, ret;
>
> if (!tz->ops->set_trip_temp && !tz->trips)
> return -EPERM;
>
> - if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
> + if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) != 1)
> return -EINVAL;
>
> - if (kstrtoint(buf, 10, &temperature))
> + if (kstrtoint(buf, 10, &trip.temperature))
> return -EINVAL;
>
> if (tz->ops->set_trip_temp) {
> - ret = tz->ops->set_trip_temp(tz, trip, temperature);
> + ret = tz->ops->set_trip_temp(tz, trip_id, trip.temperature);
> if (ret)
> return ret;
> }
>
> if (tz->trips)
> - tz->trips[trip].temperature = temperature;
> + tz->trips[trip_id].temperature = trip.temperature;
>
> - if (tz->ops->get_trip_hyst) {
> - ret = tz->ops->get_trip_hyst(tz, trip, &hyst);
> - if (ret)
> - return ret;
> - }
> -
> - ret = tz->ops->get_trip_type(tz, trip, &type);
> + ret = thermal_zone_get_trip(tz, trip_id, &trip);
> if (ret)
> return ret;
>
> - thermal_notify_tz_trip_change(tz->id, trip, type, temperature, hyst);
> + thermal_notify_tz_trip_change(tz->id, trip_id, trip.type,
> + trip.temperature, trip.hysteresis);
>
> thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
>
> @@ -159,21 +150,17 @@ trip_point_temp_show(struct device *dev, struct device_attribute *attr,
> char *buf)
> {
> struct thermal_zone_device *tz = to_thermal_zone(dev);
> - int trip, ret;
> - int temperature;
> + struct thermal_trip trip;
> + int trip_id, ret;
>
> - if (!tz->ops->get_trip_temp)
> - return -EPERM;
> -
> - if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
> + if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) != 1)
> return -EINVAL;
>
> - ret = tz->ops->get_trip_temp(tz, trip, &temperature);
> -
> + ret = thermal_zone_get_trip(tz, trip_id, &trip);
> if (ret)
> return ret;
>
> - return sprintf(buf, "%d\n", temperature);
> + return sprintf(buf, "%d\n", trip.temperature);
> }
>
> static ssize_t
> @@ -211,18 +198,17 @@ trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
> char *buf)
> {
> struct thermal_zone_device *tz = to_thermal_zone(dev);
> - int trip, ret;
> - int temperature;
> + struct thermal_trip trip;
> + int trip_id, ret;
>
> - if (!tz->ops->get_trip_hyst)
> - return -EPERM;
> -
> - if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
> + if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip_id) != 1)
> return -EINVAL;
>
> - ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
> + ret = thermal_zone_get_trip(tz, trip_id, &trip);
> + if (ret)
> + return ret;
>
> - return ret ? ret : sprintf(buf, "%d\n", temperature);
> + return ret ? ret : sprintf(buf, "%d\n", trip.hysteresis);
> }
>
> static ssize_t
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index a5a18351a898..feb8b61df746 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -335,6 +335,13 @@ static inline void devm_thermal_of_zone_unregister(struct device *dev,
> }
> #endif
>
> +int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
> + struct thermal_trip *trip);
> +
> +int thermal_zone_get_num_trips(struct thermal_zone_device *tz);
> +
> +int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp);
> +
> #ifdef CONFIG_THERMAL
> struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
> void *, struct thermal_zone_device_ops *,
> --
> 2.34.1
>

Next message: Rafael J. Wysocki: "Re: [PATCH v7 02/29] thermal/sysfs: Always expose hysteresis attributes"
Previous message: Namhyung Kim: "Re: [PATCH] perf: fix the probe finder location (.dwo files)"
In reply to: Daniel Lezcano: "[PATCH v7 01/29] thermal/core: Add a generic thermal_zone_get_trip() function"
Next in thread: Daniel Lezcano: "[PATCH v7 02/29] thermal/sysfs: Always expose hysteresis attributes"
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