Merge branches 'pm-cpuidle', 'pm-qos', 'pm-devfreq' and 'pm-opp'

Merge a cpuidle update, a PM QoS update, devfreq updates, and an OPP
(operating performance points) update for 6.17-rc1:

 - Fix opencoded for_each_cpu() in idle_state_valid() in the DT cpuidle
   driver (Yury Norov)

 - Remove info about non-existing QoS interfaces from the PM QoS
   documentation (Ulf Hansson)

 - Use c_* types via kernel prelude in Rust for OPP (Abhinav Ananthu)

 - Add HiSilicon uncore frequency scaling driver to devfreq (Jie Zhan)

 - Allow devfreq drivers to add custom sysfs ABIs (Jie Zhan)

 - Simplify the sun8i-a33-mbus devfreq driver by using more devm
   functions (Uwe Kleine-König)

 - Fix an index typo in trans_stat() in devfreq (Chanwoo Choi)

 - Check devfreq governor before using governor->name (Lifeng Zheng)

 - Remove a redundant devfreq_get_freq_range() call from
   devfreq_add_device() (Lifeng Zheng)

 - Limit max_freq with scaling_min_freq in devfreq (Lifeng Zheng)

 - Replace sscanf() with kstrtoul() in set_freq_store() (Lifeng Zheng)

* pm-cpuidle:
  cpuidle: dt: fix opencoded for_each_cpu() in idle_state_valid()

* pm-qos:
  Documentation: power: Remove info about non-existing QoS interfaces

* pm-devfreq:
  PM / devfreq: Add HiSilicon uncore frequency scaling driver
  PM / devfreq: Allow devfreq driver to add custom sysfs ABIs
  PM / devfreq: sun8i-a33-mbus: Simplify by using more devm functions
  PM / devfreq: Fix a index typo in trans_stat
  PM / devfreq: Check governor before using governor->name
  PM / devfreq: Remove redundant devfreq_get_freq_range() calling in devfreq_add_device()
  PM / devfreq: Limit max_freq with scaling_min_freq
  PM / devfreq: governor: Replace sscanf() with kstrtoul() in set_freq_store()

* pm-opp:
  rust: opp: use c_* types via kernel prelude

Author: rafaeljw

Documentation/ABI/testing/sysfs-class-devfreq

@@ -132,3 +132,12 @@ Description:
 
 		A list of governors that support the node:
 		- simple_ondemand
+
+What:		/sys/class/devfreq/.../related_cpus
+Date:		June 2025
+Contact:	Linux power management list <linux-pm@vger.kernel.org>
+Description:	The list of CPUs whose performance is closely related to the
+		frequency of this devfreq domain.
+
+		This file is only present if a specific devfreq device is
+		closely associated with a subset of CPUs.

Documentation/power/pm_qos_interface.rst

@@ -52,13 +52,6 @@ int cpu_latency_qos_request_active(handle):
   Returns if the request is still active, i.e. it has not been removed from the
   CPU latency QoS list.
 
-int cpu_latency_qos_add_notifier(notifier):
-  Adds a notification callback function to the CPU latency QoS. The callback is
-  called when the aggregated value for the CPU latency QoS is changed.
-
-int cpu_latency_qos_remove_notifier(notifier):
-  Removes the notification callback function from the CPU latency QoS.
-
 
 From user space:
 

drivers/cpuidle/dt_idle_states.c

@@ -98,7 +98,6 @@ static bool idle_state_valid(struct device_node *state_node, unsigned int idx,
 {
 	int cpu;
 	struct device_node *cpu_node, *curr_state_node;
-	bool valid = true;
 
 	/*
 	 * Compare idle state phandles for index idx on all CPUs in the
@@ -107,20 +106,17 @@ static bool idle_state_valid(struct device_node *state_node, unsigned int idx,
 	 * retrieved from. If a mismatch is found bail out straight
 	 * away since we certainly hit a firmware misconfiguration.
 	 */
-	for (cpu = cpumask_next(cpumask_first(cpumask), cpumask);
-	     cpu < nr_cpu_ids; cpu = cpumask_next(cpu, cpumask)) {
+	cpu = cpumask_first(cpumask) + 1;
+	for_each_cpu_from(cpu, cpumask) {
 		cpu_node = of_cpu_device_node_get(cpu);
 		curr_state_node = of_get_cpu_state_node(cpu_node, idx);
-		if (state_node != curr_state_node)
-			valid = false;
-
 		of_node_put(curr_state_node);
 		of_node_put(cpu_node);
-		if (!valid)
-			break;
+		if (state_node != curr_state_node)
+			return false;
 	}
 
-	return valid;
+	return true;
 }
 
 /**

drivers/devfreq/Kconfig

@@ -90,6 +90,17 @@ config ARM_EXYNOS_BUS_DEVFREQ
 	  and adjusts the operating frequencies and voltages with OPP support.
 	  This does not yet operate with optimal voltages.
 
+config ARM_HISI_UNCORE_DEVFREQ
+	tristate "HiSilicon uncore DEVFREQ Driver"
+	depends on ACPI && ACPI_PPTT && PCC
+	select DEVFREQ_GOV_PERFORMANCE
+	select DEVFREQ_GOV_USERSPACE
+	help
+	  This adds a DEVFREQ driver that manages uncore frequency scaling for
+	  HiSilicon Kunpeng SoCs. This enables runtime management of uncore
+	  frequency scaling from kernel and userspace. The uncore domain
+	  contains system interconnects and L3 cache.
+
 config ARM_IMX_BUS_DEVFREQ
 	tristate "i.MX Generic Bus DEVFREQ Driver"
 	depends on ARCH_MXC || COMPILE_TEST

drivers/devfreq/Makefile

@@ -9,6 +9,7 @@ obj-$(CONFIG_DEVFREQ_GOV_PASSIVE)	+= governor_passive.o
 
 # DEVFREQ Drivers
 obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ)	+= exynos-bus.o
+obj-$(CONFIG_ARM_HISI_UNCORE_DEVFREQ)	+= hisi_uncore_freq.o
 obj-$(CONFIG_ARM_IMX_BUS_DEVFREQ)	+= imx-bus.o
 obj-$(CONFIG_ARM_IMX8M_DDRC_DEVFREQ)	+= imx8m-ddrc.o
 obj-$(CONFIG_ARM_MEDIATEK_CCI_DEVFREQ)	+= mtk-cci-devfreq.o

drivers/devfreq/devfreq.c

@@ -152,11 +152,8 @@ void devfreq_get_freq_range(struct devfreq *devfreq,
 				(unsigned long)HZ_PER_KHZ * qos_max_freq);
 
 	/* Apply constraints from OPP interface */
-	*min_freq = max(*min_freq, devfreq->scaling_min_freq);
-	*max_freq = min(*max_freq, devfreq->scaling_max_freq);
-
-	if (*min_freq > *max_freq)
-		*min_freq = *max_freq;
+	*max_freq = clamp(*max_freq, devfreq->scaling_min_freq, devfreq->scaling_max_freq);
+	*min_freq = clamp(*min_freq, devfreq->scaling_min_freq, *max_freq);
 }
 EXPORT_SYMBOL(devfreq_get_freq_range);
 
@@ -807,7 +804,6 @@ struct devfreq *devfreq_add_device(struct device *dev,
 {
 	struct devfreq *devfreq;
 	struct devfreq_governor *governor;
-	unsigned long min_freq, max_freq;
 	int err = 0;
 
 	if (!dev || !profile || !governor_name) {
@@ -835,6 +831,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
 	mutex_lock(&devfreq->lock);
 	devfreq->dev.parent = dev;
 	devfreq->dev.class = devfreq_class;
+	devfreq->dev.groups = profile->dev_groups;
 	devfreq->dev.release = devfreq_dev_release;
 	INIT_LIST_HEAD(&devfreq->node);
 	devfreq->profile = profile;
@@ -875,8 +872,6 @@ struct devfreq *devfreq_add_device(struct device *dev,
 		goto err_dev;
 	}
 
-	devfreq_get_freq_range(devfreq, &min_freq, &max_freq);
-
 	devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev);
 	devfreq->opp_table = dev_pm_opp_get_opp_table(dev);
 	if (IS_ERR(devfreq->opp_table))
@@ -1382,15 +1377,11 @@ int devfreq_remove_governor(struct devfreq_governor *governor)
 		int ret;
 		struct device *dev = devfreq->dev.parent;
 
+		if (!devfreq->governor)
+			continue;
+
 		if (!strncmp(devfreq->governor->name, governor->name,
 			     DEVFREQ_NAME_LEN)) {
-			/* we should have a devfreq governor! */
-			if (!devfreq->governor) {
-				dev_warn(dev, "%s: Governor %s NOT present\n",
-					 __func__, governor->name);
-				continue;
-				/* Fall through */
-			}
 			ret = devfreq->governor->event_handler(devfreq,
 						DEVFREQ_GOV_STOP, NULL);
 			if (ret) {
@@ -1743,7 +1734,7 @@ static ssize_t trans_stat_show(struct device *dev,
 	for (i = 0; i < max_state; i++) {
 		if (len >= PAGE_SIZE - 1)
 			break;
-		if (df->freq_table[2] == df->previous_freq)
+		if (df->freq_table[i] == df->previous_freq)
 			len += sysfs_emit_at(buf, len, "*");
 		else
 			len += sysfs_emit_at(buf, len, " ");

drivers/devfreq/governor_userspace.c

@@ -9,6 +9,7 @@
 #include <linux/slab.h>
 #include <linux/device.h>
 #include <linux/devfreq.h>
+#include <linux/kstrtox.h>
 #include <linux/pm.h>
 #include <linux/mutex.h>
 #include <linux/module.h>
@@ -39,10 +40,13 @@ static ssize_t set_freq_store(struct device *dev, struct device_attribute *attr,
 	unsigned long wanted;
 	int err = 0;
 
+	err = kstrtoul(buf, 0, &wanted);
+	if (err)
+		return err;
+
 	mutex_lock(&devfreq->lock);
 	data = devfreq->governor_data;
 
-	sscanf(buf, "%lu", &wanted);
 	data->user_frequency = wanted;
 	data->valid = true;
 	err = update_devfreq(devfreq);