Merge branch 'thermal-core'

Merge thermal control core changes for 6.3-rc1:

 - Clean up thermal device unregistration code (Viresh Kumar).

 - Fix and clean up thermal control core initialization error code
   paths (Daniel Lezcano).

 - Relocate the trip points handling code into a separate file (Daniel
   Lezcano).

 - Make the thermal core fail registration of thermal zones and cooling
   devices if the thermal class has not been registered (Rafael Wysocki).

 - Make the core thermal control code use sysfs_emit_at() instead of
   scnprintf() where applicable (ye xingchen).

* thermal-core:
  thermal: core: Use sysfs_emit_at() instead of scnprintf()
  thermal: Fail object registration if thermal class is not registered
  thermal/core: Move the thermal trip code to a dedicated file
  thermal/core: Remove unneeded ida_destroy()
  thermal/core: Fix unregistering netlink at thermal init time
  thermal: core: Use device_unregister() instead of device_del/put()
  thermal: core: Move cdev cleanup to thermal_release()

drivers/thermal/Makefile

@@ -4,8 +4,8 @@
 #
 
 obj-$(CONFIG_THERMAL)		+= thermal_sys.o
-thermal_sys-y			+= thermal_core.o thermal_sysfs.o \
-					thermal_helpers.o
+thermal_sys-y			+= thermal_core.o thermal_sysfs.o
+thermal_sys-y			+= thermal_trip.o thermal_helpers.o
 
 # netlink interface to manage the thermal framework
 thermal_sys-$(CONFIG_THERMAL_NETLINK)		+= thermal_netlink.o

drivers/thermal/thermal_core.c

@@ -229,10 +229,9 @@ int thermal_build_list_of_policies(char *buf)
 	mutex_lock(&thermal_governor_lock);
 
 	list_for_each_entry(pos, &thermal_governor_list, governor_list) {
-		count += scnprintf(buf + count, PAGE_SIZE - count, "%s ",
-				   pos->name);
+		count += sysfs_emit_at(buf, count, "%s ", pos->name);
 	}
-	count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
+	count += sysfs_emit_at(buf, count, "\n");
 
 	mutex_unlock(&thermal_governor_lock);
 
@@ -770,14 +769,14 @@ static void thermal_release(struct device *dev)
 	} else if (!strncmp(dev_name(dev), "cooling_device",
 			    sizeof("cooling_device") - 1)) {
 		cdev = to_cooling_device(dev);
+		thermal_cooling_device_destroy_sysfs(cdev);
+		kfree(cdev->type);
+		ida_free(&thermal_cdev_ida, cdev->id);
 		kfree(cdev);
 	}
 }
 
-static struct class thermal_class = {
-	.name = "thermal",
-	.dev_release = thermal_release,
-};
+static struct class *thermal_class;
 
 static inline
 void print_bind_err_msg(struct thermal_zone_device *tz,
@@ -880,6 +879,9 @@ __thermal_cooling_device_register(struct device_node *np,
 	    !ops->set_cur_state)
 		return ERR_PTR(-EINVAL);
 
+	if (!thermal_class)
+		return ERR_PTR(-ENODEV);
+
 	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 	if (!cdev)
 		return ERR_PTR(-ENOMEM);
@@ -901,27 +903,25 @@ __thermal_cooling_device_register(struct device_node *np,
 	cdev->np = np;
 	cdev->ops = ops;
 	cdev->updated = false;
-	cdev->device.class = &thermal_class;
+	cdev->device.class = thermal_class;
 	cdev->devdata = devdata;
 
 	ret = cdev->ops->get_max_state(cdev, &cdev->max_state);
-	if (ret) {
-		kfree(cdev->type);
-		goto out_ida_remove;
-	}
+	if (ret)
+		goto out_cdev_type;
 
 	thermal_cooling_device_setup_sysfs(cdev);
 
 	ret = dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
-	if (ret) {
-		kfree(cdev->type);
-		thermal_cooling_device_destroy_sysfs(cdev);
-		goto out_ida_remove;
-	}
+	if (ret)
+		goto out_cooling_dev;
 
 	ret = device_register(&cdev->device);
-	if (ret)
-		goto out_kfree_type;
+	if (ret) {
+		/* thermal_release() handles rest of the cleanup */
+		put_device(&cdev->device);
+		return ERR_PTR(ret);
+	}
 
 	/* Add 'this' new cdev to the global cdev list */
 	mutex_lock(&thermal_list_lock);
@@ -940,13 +940,10 @@ __thermal_cooling_device_register(struct device_node *np,
 
 	return cdev;
 
-out_kfree_type:
+out_cooling_dev:
 	thermal_cooling_device_destroy_sysfs(cdev);
+out_cdev_type:
 	kfree(cdev->type);
-	put_device(&cdev->device);
-
-	/* thermal_release() takes care of the rest */
-	cdev = NULL;
 out_ida_remove:
 	ida_free(&thermal_cdev_ida, id);
 out_kfree_cdev:
@@ -1107,11 +1104,7 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
 
 	mutex_unlock(&thermal_list_lock);
 
-	ida_free(&thermal_cdev_ida, cdev->id);
-	device_del(&cdev->device);
-	thermal_cooling_device_destroy_sysfs(cdev);
-	kfree(cdev->type);
-	put_device(&cdev->device);
+	device_unregister(&cdev->device);
 }
 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
 
@@ -1162,12 +1155,6 @@ 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;
@@ -1194,87 +1181,6 @@ int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp)
 }
 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);
-}
-EXPORT_SYMBOL_GPL(__thermal_zone_get_trip);
-
-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);
-
-int thermal_zone_set_trip(struct thermal_zone_device *tz, int trip_id,
-			  const struct thermal_trip *trip)
-{
-	struct thermal_trip t;
-	int ret;
-
-	if (!tz->ops->set_trip_temp && !tz->ops->set_trip_hyst && !tz->trips)
-		return -EINVAL;
-
-	ret = __thermal_zone_get_trip(tz, trip_id, &t);
-	if (ret)
-		return ret;
-
-	if (t.type != trip->type)
-		return -EINVAL;
-
-	if (t.temperature != trip->temperature && tz->ops->set_trip_temp) {
-		ret = tz->ops->set_trip_temp(tz, trip_id, trip->temperature);
-		if (ret)
-			return ret;
-	}
-
-	if (t.hysteresis != trip->hysteresis && tz->ops->set_trip_hyst) {
-		ret = tz->ops->set_trip_hyst(tz, trip_id, trip->hysteresis);
-		if (ret)
-			return ret;
-	}
-
-	if (tz->trips && (t.temperature != trip->temperature || t.hysteresis != trip->hysteresis))
-		tz->trips[trip_id] = *trip;
-
-	thermal_notify_tz_trip_change(tz->id, trip_id, trip->type,
-				      trip->temperature, trip->hysteresis);
-
-	__thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
-	
-	return 0;
-}
-
 /**
  * thermal_zone_device_register_with_trips() - register a new thermal zone device
  * @type:	the thermal zone device type
@@ -1349,6 +1255,9 @@ thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *t
 	if (num_trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp) && !trips)
 		return ERR_PTR(-EINVAL);
 
+	if (!thermal_class)
+		return ERR_PTR(-ENODEV);
+
 	tz = kzalloc(sizeof(*tz), GFP_KERNEL);
 	if (!tz)
 		return ERR_PTR(-ENOMEM);
@@ -1370,7 +1279,7 @@ thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *t
 
 	tz->ops = ops;
 	tz->tzp = tzp;
-	tz->device.class = &thermal_class;
+	tz->device.class = thermal_class;
 	tz->devdata = devdata;
 	tz->trips = trips;
 	tz->num_trips = num_trips;
@@ -1613,11 +1522,23 @@ static int __init thermal_init(void)
 
 	result = thermal_register_governors();
 	if (result)
-		goto error;
+		goto unregister_netlink;
 
-	result = class_register(&thermal_class);
-	if (result)
+	thermal_class = kzalloc(sizeof(*thermal_class), GFP_KERNEL);
+	if (!thermal_class) {
+		result = -ENOMEM;
 		goto unregister_governors;
+	}
+
+	thermal_class->name = "thermal";
+	thermal_class->dev_release = thermal_release;
+
+	result = class_register(thermal_class);
+	if (result) {
+		kfree(thermal_class);
+		thermal_class = NULL;
+		goto unregister_governors;
+	}
 
 	result = register_pm_notifier(&thermal_pm_nb);
 	if (result)
@@ -1628,9 +1549,9 @@ static int __init thermal_init(void)
 
 unregister_governors:
 	thermal_unregister_governors();
+unregister_netlink:
+	thermal_netlink_exit();
 error:
-	ida_destroy(&thermal_tz_ida);
-	ida_destroy(&thermal_cdev_ida);
 	mutex_destroy(&thermal_list_lock);
 	mutex_destroy(&thermal_governor_lock);
 	return result;

drivers/thermal/thermal_core.h

@@ -52,6 +52,10 @@ int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
 int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
 			      void *thermal_governor);
 
+int __for_each_thermal_trip(struct thermal_zone_device *,
+			    int (*cb)(struct thermal_trip *, void *),
+			    void *);
+
 struct thermal_zone_device *thermal_zone_get_by_id(int id);
 
 struct thermal_attr {

drivers/thermal/thermal_helpers.c

@@ -146,68 +146,6 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 }
 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 
-/**
- * __thermal_zone_set_trips - Computes the next trip points for the driver
- * @tz: a pointer to a thermal zone device structure
- *
- * The function computes the next temperature boundaries by browsing
- * the trip points. The result is the closer low and high trip points
- * to the current temperature. These values are passed to the backend
- * driver to let it set its own notification mechanism (usually an
- * interrupt).
- *
- * This function must be called with tz->lock held. Both tz and tz->ops
- * must be valid pointers.
- *
- * It does not return a value
- */
-void __thermal_zone_set_trips(struct thermal_zone_device *tz)
-{
-	struct thermal_trip trip;
-	int low = -INT_MAX, high = INT_MAX;
-	int i, ret;
-
-	lockdep_assert_held(&tz->lock);
-
-	if (!tz->ops->set_trips)
-		return;
-
-	for (i = 0; i < tz->num_trips; i++) {
-		int trip_low;
-
-		ret = __thermal_zone_get_trip(tz, i , &trip);
-		if (ret)
-			return;
-
-		trip_low = trip.temperature - trip.hysteresis;
-
-		if (trip_low < tz->temperature && trip_low > low)
-			low = trip_low;
-
-		if (trip.temperature > tz->temperature &&
-		    trip.temperature < high)
-			high = trip.temperature;
-	}
-
-	/* No need to change trip points */
-	if (tz->prev_low_trip == low && tz->prev_high_trip == high)
-		return;
-
-	tz->prev_low_trip = low;
-	tz->prev_high_trip = high;
-
-	dev_dbg(&tz->device,
-		"new temperature boundaries: %d < x < %d\n", low, high);
-
-	/*
-	 * Set a temperature window. When this window is left the driver
-	 * must inform the thermal core via thermal_zone_device_update.
-	 */
-	ret = tz->ops->set_trips(tz, low, high);
-	if (ret)
-		dev_err(&tz->device, "Failed to set trips: %d\n", ret);
-}
-
 static void thermal_cdev_set_cur_state(struct thermal_cooling_device *cdev,
 				       int target)
 {

drivers/thermal/thermal_netlink.c

@@ -699,3 +699,8 @@ int __init thermal_netlink_init(void)
 {
 	return genl_register_family(&thermal_gnl_family);
 }
+
+void __init thermal_netlink_exit(void)
+{
+	genl_unregister_family(&thermal_gnl_family);
+}

drivers/thermal/thermal_netlink.h

@@ -13,6 +13,7 @@ struct thermal_genl_cpu_caps {
 /* Netlink notification function */
 #ifdef CONFIG_THERMAL_NETLINK
 int __init thermal_netlink_init(void);
+void __init thermal_netlink_exit(void);
 int thermal_notify_tz_create(int tz_id, const char *name);
 int thermal_notify_tz_delete(int tz_id);
 int thermal_notify_tz_enable(int tz_id);
@@ -115,4 +116,6 @@ static inline int thermal_genl_cpu_capability_event(int count, struct thermal_ge
 	return 0;
 }
 
+static inline void __init thermal_netlink_exit(void) {}
+
 #endif /* CONFIG_THERMAL_NETLINK */

drivers/thermal/thermal_trip.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (C) 2008 Intel Corp
+ *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
+ *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
+ *  Copyright 2022 Linaro Limited
+ *
+ * Thermal trips handling
+ */
+#include "thermal_core.h"
+
+int __for_each_thermal_trip(struct thermal_zone_device *tz,
+			    int (*cb)(struct thermal_trip *, void *),
+			    void *data)
+{
+	int i, ret;
+	struct thermal_trip trip;
+
+	lockdep_assert_held(&tz->lock);
+
+	for (i = 0; i < tz->num_trips; i++) {
+
+		ret = __thermal_zone_get_trip(tz, i, &trip);
+		if (ret)
+			return ret;
+
+		ret = cb(&trip, data);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+int thermal_zone_get_num_trips(struct thermal_zone_device *tz)
+{
+	return tz->num_trips;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_get_num_trips);
+
+/**
+ * __thermal_zone_set_trips - Computes the next trip points for the driver
+ * @tz: a pointer to a thermal zone device structure
+ *
+ * The function computes the next temperature boundaries by browsing
+ * the trip points. The result is the closer low and high trip points
+ * to the current temperature. These values are passed to the backend
+ * driver to let it set its own notification mechanism (usually an
+ * interrupt).
+ *
+ * This function must be called with tz->lock held. Both tz and tz->ops
+ * must be valid pointers.
+ *
+ * It does not return a value
+ */
+void __thermal_zone_set_trips(struct thermal_zone_device *tz)
+{
+	struct thermal_trip trip;
+	int low = -INT_MAX, high = INT_MAX;
+	int i, ret;
+
+	lockdep_assert_held(&tz->lock);
+
+	if (!tz->ops->set_trips)
+		return;
+
+	for (i = 0; i < tz->num_trips; i++) {
+		int trip_low;
+
+		ret = __thermal_zone_get_trip(tz, i , &trip);
+		if (ret)
+			return;
+
+		trip_low = trip.temperature - trip.hysteresis;
+
+		if (trip_low < tz->temperature && trip_low > low)
+			low = trip_low;
+
+		if (trip.temperature > tz->temperature &&
+		    trip.temperature < high)
+			high = trip.temperature;
+	}
+
+	/* No need to change trip points */
+	if (tz->prev_low_trip == low && tz->prev_high_trip == high)
+		return;
+
+	tz->prev_low_trip = low;
+	tz->prev_high_trip = high;
+
+	dev_dbg(&tz->device,
+		"new temperature boundaries: %d < x < %d\n", low, high);
+
+	/*
+	 * Set a temperature window. When this window is left the driver
+	 * must inform the thermal core via thermal_zone_device_update.
+	 */
+	ret = tz->ops->set_trips(tz, low, high);
+	if (ret)
+		dev_err(&tz->device, "Failed to set trips: %d\n", ret);
+}
+
+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);
+}
+EXPORT_SYMBOL_GPL(__thermal_zone_get_trip);
+
+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);
+
+int thermal_zone_set_trip(struct thermal_zone_device *tz, int trip_id,
+			  const struct thermal_trip *trip)
+{
+	struct thermal_trip t;
+	int ret;
+
+	if (!tz->ops->set_trip_temp && !tz->ops->set_trip_hyst && !tz->trips)
+		return -EINVAL;
+
+	ret = __thermal_zone_get_trip(tz, trip_id, &t);
+	if (ret)
+		return ret;
+
+	if (t.type != trip->type)
+		return -EINVAL;
+
+	if (t.temperature != trip->temperature && tz->ops->set_trip_temp) {
+		ret = tz->ops->set_trip_temp(tz, trip_id, trip->temperature);
+		if (ret)
+			return ret;
+	}
+
+	if (t.hysteresis != trip->hysteresis && tz->ops->set_trip_hyst) {
+		ret = tz->ops->set_trip_hyst(tz, trip_id, trip->hysteresis);
+		if (ret)
+			return ret;
+	}
+
+	if (tz->trips && (t.temperature != trip->temperature || t.hysteresis != trip->hysteresis))
+		tz->trips[trip_id] = *trip;
+
+	thermal_notify_tz_trip_change(tz->id, trip_id, trip->type,
+				      trip->temperature, trip->hysteresis);
+
+	__thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
+
+	return 0;
+}