Merge branch 'pm-opp' (29cff184) · Commits · e / devices / android_kernel_xiaomi_nabu

drivers/base/power/opp/Makefile

+1 −0

Original line number	Diff line number	Diff line
		ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
		obj-y += core.o cpu.o
		obj-$(CONFIG_OF) += of.o
		obj-$(CONFIG_DEBUG_FS) += debugfs.o

drivers/base/power/opp/core.c

+21 −419

Original line number	Diff line number	Diff line
		@@ -18,7 +18,6 @@
		#include <linux/err.h>
		#include <linux/slab.h>
		#include <linux/device.h>
		#include <linux/of.h>
		#include <linux/export.h>
		#include <linux/regulator/consumer.h>

		@@ -29,7 +28,7 @@
		* from here, with each opp_table containing the list of opps it supports in
		* various states of availability.
		*/
		static LIST_HEAD(opp_tables);
		LIST_HEAD(opp_tables);
		/* Lock to allow exclusive modification to the device and opp lists */
		DEFINE_MUTEX(opp_table_lock);

		@@ -53,26 +52,6 @@ static struct opp_device _find_opp_dev(const struct device dev,
		return NULL;
		}

		static struct opp_table _managed_opp(const struct device_node np)
		{
		struct opp_table *opp_table;

		list_for_each_entry_rcu(opp_table, &opp_tables, node) {
		if (opp_table->np == np) {
		/*
		* Multiple devices can point to the same OPP table and
		* so will have same node-pointer, np.
		*
		* But the OPPs will be considered as shared only if the
		* OPP table contains a "opp-shared" property.
		*/
		return opp_table->shared_opp ? opp_table : NULL;
		}
		}

		return NULL;
		}

		/**
		* _find_opp_table() - find opp_table struct using device pointer
		* @dev: device pointer used to lookup OPP table
		@@ -757,7 +736,6 @@ static struct opp_table _add_opp_table(struct device dev)
		{
		struct opp_table *opp_table;
		struct opp_device *opp_dev;
		struct device_node *np;
		int ret;

		/* Check for existing table for 'dev' first */
		@@ -781,20 +759,7 @@ static struct opp_table _add_opp_table(struct device dev)
		return NULL;
		}

		/*
		* Only required for backward compatibility with v1 bindings, but isn't
		* harmful for other cases. And so we do it unconditionally.
		*/
		np = of_node_get(dev->of_node);
		if (np) {
		u32 val;

		if (!of_property_read_u32(np, "clock-latency", &val))
		opp_table->clock_latency_ns_max = val;
		of_property_read_u32(np, "voltage-tolerance",
		&opp_table->voltage_tolerance_v1);
		of_node_put(np);
		}
		_of_init_opp_table(opp_table, dev);

		/* Set regulator to a non-NULL error value */
		opp_table->regulator = ERR_PTR(-ENXIO);
		@@ -890,8 +855,8 @@ static void _kfree_opp_rcu(struct rcu_head *head)
		* It is assumed that the caller holds required mutex for an RCU updater
		* strategy.
		*/
		static void _opp_remove(struct opp_table *opp_table,
		struct dev_pm_opp *opp, bool notify)
		void _opp_remove(struct opp_table opp_table, struct dev_pm_opp opp,
		bool notify)
		{
		/*
		* Notify the changes in the availability of the operable
		@@ -952,7 +917,7 @@ void dev_pm_opp_remove(struct device *dev, unsigned long freq)
		}
		EXPORT_SYMBOL_GPL(dev_pm_opp_remove);

		static struct dev_pm_opp _allocate_opp(struct device dev,
		struct dev_pm_opp _allocate_opp(struct device dev,
		struct opp_table **opp_table)
		{
		struct dev_pm_opp *opp;
		@@ -989,7 +954,7 @@ static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
		return true;
		}

		static int _opp_add(struct device dev, struct dev_pm_opp new_opp,
		int _opp_add(struct device dev, struct dev_pm_opp new_opp,
		struct opp_table *opp_table)
		{
		struct dev_pm_opp *opp;
		@@ -1066,7 +1031,7 @@ static int _opp_add(struct device dev, struct dev_pm_opp new_opp,
		* Duplicate OPPs (both freq and volt are same) and !opp->available
		* -ENOMEM Memory allocation failure
		*/
		static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
		int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
		bool dynamic)
		{
		struct opp_table *opp_table;
		@@ -1112,83 +1077,6 @@ static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
		return ret;
		}

		/* TODO: Support multiple regulators */
		static int opp_parse_supplies(struct dev_pm_opp opp, struct device dev,
		struct opp_table *opp_table)
		{
		u32 microvolt[3] = {0};
		u32 val;
		int count, ret;
		struct property *prop = NULL;
		char name[NAME_MAX];

		/* Search for "opp-microvolt-<name>" */
		if (opp_table->prop_name) {
		snprintf(name, sizeof(name), "opp-microvolt-%s",
		opp_table->prop_name);
		prop = of_find_property(opp->np, name, NULL);
		}

		if (!prop) {
		/* Search for "opp-microvolt" */
		sprintf(name, "opp-microvolt");
		prop = of_find_property(opp->np, name, NULL);

		/* Missing property isn't a problem, but an invalid entry is */
		if (!prop)
		return 0;
		}

		count = of_property_count_u32_elems(opp->np, name);
		if (count < 0) {
		dev_err(dev, "%s: Invalid %s property (%d)\n",
		__func__, name, count);
		return count;
		}

		/* There can be one or three elements here */
		if (count != 1 && count != 3) {
		dev_err(dev, "%s: Invalid number of elements in %s property (%d)\n",
		__func__, name, count);
		return -EINVAL;
		}

		ret = of_property_read_u32_array(opp->np, name, microvolt, count);
		if (ret) {
		dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret);
		return -EINVAL;
		}

		opp->u_volt = microvolt[0];

		if (count == 1) {
		opp->u_volt_min = opp->u_volt;
		opp->u_volt_max = opp->u_volt;
		} else {
		opp->u_volt_min = microvolt[1];
		opp->u_volt_max = microvolt[2];
		}

		/* Search for "opp-microamp-<name>" */
		prop = NULL;
		if (opp_table->prop_name) {
		snprintf(name, sizeof(name), "opp-microamp-%s",
		opp_table->prop_name);
		prop = of_find_property(opp->np, name, NULL);
		}

		if (!prop) {
		/* Search for "opp-microamp" */
		sprintf(name, "opp-microamp");
		prop = of_find_property(opp->np, name, NULL);
		}

		if (prop && !of_property_read_u32(opp->np, name, &val))
		opp->u_amp = val;

		return 0;
		}

		/**
		* dev_pm_opp_set_supported_hw() - Set supported platforms
		* @dev: Device for which supported-hw has to be set.
		@@ -1517,144 +1405,6 @@ void dev_pm_opp_put_regulator(struct device *dev)
		}
		EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulator);

		static bool _opp_is_supported(struct device dev, struct opp_table opp_table,
		struct device_node *np)
		{
		unsigned int count = opp_table->supported_hw_count;
		u32 version;
		int ret;

		if (!opp_table->supported_hw)
		return true;

		while (count--) {
		ret = of_property_read_u32_index(np, "opp-supported-hw", count,
		&version);
		if (ret) {
		dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n",
		__func__, count, ret);
		return false;
		}

		/* Both of these are bitwise masks of the versions */
		if (!(version & opp_table->supported_hw[count]))
		return false;
		}

		return true;
		}

		/**
		* _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
		* @dev: device for which we do this operation
		* @np: device node
		*
		* This function adds an opp definition to the opp table and returns status. The
		* opp can be controlled using dev_pm_opp_enable/disable functions and may be
		* removed by dev_pm_opp_remove.
		*
		* Locking: The internal opp_table and opp structures are RCU protected.
		* Hence this function internally uses RCU updater strategy with mutex locks
		* to keep the integrity of the internal data structures. Callers should ensure
		* that this function is NOT called under RCU protection or in contexts where
		* mutex cannot be locked.
		*
		* Return:
		* 0 On success OR
		* Duplicate OPPs (both freq and volt are same) and opp->available
		* -EEXIST Freq are same and volt are different OR
		* Duplicate OPPs (both freq and volt are same) and !opp->available
		* -ENOMEM Memory allocation failure
		* -EINVAL Failed parsing the OPP node
		*/
		static int _opp_add_static_v2(struct device dev, struct device_node np)
		{
		struct opp_table *opp_table;
		struct dev_pm_opp *new_opp;
		u64 rate;
		u32 val;
		int ret;

		/* Hold our table modification lock here */
		mutex_lock(&opp_table_lock);

		new_opp = _allocate_opp(dev, &opp_table);
		if (!new_opp) {
		ret = -ENOMEM;
		goto unlock;
		}

		ret = of_property_read_u64(np, "opp-hz", &rate);
		if (ret < 0) {
		dev_err(dev, "%s: opp-hz not found\n", __func__);
		goto free_opp;
		}

		/* Check if the OPP supports hardware's hierarchy of versions or not */
		if (!_opp_is_supported(dev, opp_table, np)) {
		dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate);
		goto free_opp;
		}

		/*
		* Rate is defined as an unsigned long in clk API, and so casting
		* explicitly to its type. Must be fixed once rate is 64 bit
		* guaranteed in clk API.
		*/
		new_opp->rate = (unsigned long)rate;
		new_opp->turbo = of_property_read_bool(np, "turbo-mode");

		new_opp->np = np;
		new_opp->dynamic = false;
		new_opp->available = true;

		if (!of_property_read_u32(np, "clock-latency-ns", &val))
		new_opp->clock_latency_ns = val;

		ret = opp_parse_supplies(new_opp, dev, opp_table);
		if (ret)
		goto free_opp;

		ret = _opp_add(dev, new_opp, opp_table);
		if (ret)
		goto free_opp;

		/* OPP to select on device suspend */
		if (of_property_read_bool(np, "opp-suspend")) {
		if (opp_table->suspend_opp) {
		dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n",
		__func__, opp_table->suspend_opp->rate,
		new_opp->rate);
		} else {
		new_opp->suspend = true;
		opp_table->suspend_opp = new_opp;
		}
		}

		if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max)
		opp_table->clock_latency_ns_max = new_opp->clock_latency_ns;

		mutex_unlock(&opp_table_lock);

		pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
		__func__, new_opp->turbo, new_opp->rate, new_opp->u_volt,
		new_opp->u_volt_min, new_opp->u_volt_max,
		new_opp->clock_latency_ns);

		/*
		* Notify the changes in the availability of the operable
		* frequency/voltage list.
		*/
		srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp);
		return 0;

		free_opp:
		_opp_remove(opp_table, new_opp, false);
		unlock:
		mutex_unlock(&opp_table_lock);
		return ret;
		}

		/**
		* dev_pm_opp_add() - Add an OPP table from a table definitions
		* @dev: device for which we do this operation
		@@ -1842,21 +1592,11 @@ struct srcu_notifier_head dev_pm_opp_get_notifier(struct device dev)
		}
		EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier);

		#ifdef CONFIG_OF
		/**
		* dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT
		* entries
		* @dev: device pointer used to lookup OPP table.
		*
		* Free OPPs created using static entries present in DT.
		*
		* Locking: The internal opp_table and opp structures are RCU protected.
		* Hence this function indirectly uses RCU updater strategy with mutex locks
		* to keep the integrity of the internal data structures. Callers should ensure
		* that this function is NOT called under RCU protection or in contexts where
		* mutex cannot be locked.
		/*
		* Free OPPs either created using static entries present in DT or even the
		* dynamically added entries based on remove_all param.
		*/
		void dev_pm_opp_of_remove_table(struct device *dev)
		void _dev_pm_opp_remove_table(struct device *dev, bool remove_all)
		{
		struct opp_table *opp_table;
		struct dev_pm_opp opp, tmp;
		@@ -1881,7 +1621,7 @@ void dev_pm_opp_of_remove_table(struct device *dev)
		if (list_is_singular(&opp_table->dev_list)) {
		/* Free static OPPs */
		list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) {
		if (!opp->dynamic)
		if (remove_all \|\| !opp->dynamic)
		_opp_remove(opp_table, opp, true);
		}
		} else {
		@@ -1891,160 +1631,22 @@ void dev_pm_opp_of_remove_table(struct device *dev)
		unlock:
		mutex_unlock(&opp_table_lock);
		}
		EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);

		/* Returns opp descriptor node for a device, caller must do of_node_put() */
		struct device_node _of_get_opp_desc_node(struct device dev)
		{
		/*
		* TODO: Support for multiple OPP tables.
		*
		* There should be only ONE phandle present in "operating-points-v2"
		* property.
		*/

		return of_parse_phandle(dev->of_node, "operating-points-v2", 0);
		}

		/* Initializes OPP tables based on new bindings */
		static int _of_add_opp_table_v2(struct device dev, struct device_node opp_np)
		{
		struct device_node *np;
		struct opp_table *opp_table;
		int ret = 0, count = 0;

		mutex_lock(&opp_table_lock);

		opp_table = _managed_opp(opp_np);
		if (opp_table) {
		/* OPPs are already managed */
		if (!_add_opp_dev(dev, opp_table))
		ret = -ENOMEM;
		mutex_unlock(&opp_table_lock);
		return ret;
		}
		mutex_unlock(&opp_table_lock);

		/* We have opp-table node now, iterate over it and add OPPs */
		for_each_available_child_of_node(opp_np, np) {
		count++;

		ret = _opp_add_static_v2(dev, np);
		if (ret) {
		dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
		ret);
		goto free_table;
		}
		}

		/* There should be one of more OPP defined */
		if (WARN_ON(!count))
		return -ENOENT;

		mutex_lock(&opp_table_lock);

		opp_table = _find_opp_table(dev);
		if (WARN_ON(IS_ERR(opp_table))) {
		ret = PTR_ERR(opp_table);
		mutex_unlock(&opp_table_lock);
		goto free_table;
		}

		opp_table->np = opp_np;
		opp_table->shared_opp = of_property_read_bool(opp_np, "opp-shared");

		mutex_unlock(&opp_table_lock);

		return 0;

		free_table:
		dev_pm_opp_of_remove_table(dev);

		return ret;
		}

		/* Initializes OPP tables based on old-deprecated bindings */
		static int _of_add_opp_table_v1(struct device *dev)
		{
		const struct property *prop;
		const __be32 *val;
		int nr;

		prop = of_find_property(dev->of_node, "operating-points", NULL);
		if (!prop)
		return -ENODEV;
		if (!prop->value)
		return -ENODATA;

		/*
		* Each OPP is a set of tuples consisting of frequency and
		* voltage like <freq-kHz vol-uV>.
		*/
		nr = prop->length / sizeof(u32);
		if (nr % 2) {
		dev_err(dev, "%s: Invalid OPP table\n", __func__);
		return -EINVAL;
		}

		val = prop->value;
		while (nr) {
		unsigned long freq = be32_to_cpup(val++) * 1000;
		unsigned long volt = be32_to_cpup(val++);

		if (_opp_add_v1(dev, freq, volt, false))
		dev_warn(dev, "%s: Failed to add OPP %ld\n",
		__func__, freq);
		nr -= 2;
		}

		return 0;
		}

		/**
		* dev_pm_opp_of_add_table() - Initialize opp table from device tree
		* dev_pm_opp_remove_table() - Free all OPPs associated with the device
		* @dev: device pointer used to lookup OPP table.
		*
		* Register the initial OPP table with the OPP library for given device.
		* Free both OPPs created using static entries present in DT and the
		* dynamically added entries.
		*
		* Locking: The internal opp_table and opp structures are RCU protected.
		* Hence this function indirectly uses RCU updater strategy with mutex locks
		* to keep the integrity of the internal data structures. Callers should ensure
		* that this function is NOT called under RCU protection or in contexts where
		* mutex cannot be locked.
		*
		* Return:
		* 0 On success OR
		* Duplicate OPPs (both freq and volt are same) and opp->available
		* -EEXIST Freq are same and volt are different OR
		* Duplicate OPPs (both freq and volt are same) and !opp->available
		* -ENOMEM Memory allocation failure
		* -ENODEV when 'operating-points' property is not found or is invalid data
		* in device node.
		* -ENODATA when empty 'operating-points' property is found
		* -EINVAL when invalid entries are found in opp-v2 table
		*/
		int dev_pm_opp_of_add_table(struct device *dev)
		void dev_pm_opp_remove_table(struct device *dev)
		{
		struct device_node *opp_np;
		int ret;

		/*
		* OPPs have two version of bindings now. The older one is deprecated,
		* try for the new binding first.
		*/
		opp_np = _of_get_opp_desc_node(dev);
		if (!opp_np) {
		/*
		* Try old-deprecated bindings for backward compatibility with
		* older dtbs.
		*/
		return _of_add_opp_table_v1(dev);
		}

		ret = _of_add_opp_table_v2(dev, opp_np);
		of_node_put(opp_np);

		return ret;
		_dev_pm_opp_remove_table(dev, true);
		}
		EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
		#endif
		EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);

drivers/base/power/opp/cpu.c

+97 −102

Original line number	Diff line number	Diff line
		@@ -18,7 +18,6 @@
		#include <linux/err.h>
		#include <linux/errno.h>
		#include <linux/export.h>
		#include <linux/of.h>
		#include <linux/slab.h>

		#include "opp.h"
		@@ -119,8 +118,66 @@ void dev_pm_opp_free_cpufreq_table(struct device *dev,
		EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
		#endif /* CONFIG_CPU_FREQ */

		/* Required only for V1 bindings, as v2 can manage it from DT itself */
		int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
		void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of)
		{
		struct device *cpu_dev;
		int cpu;

		WARN_ON(cpumask_empty(cpumask));

		for_each_cpu(cpu, cpumask) {
		cpu_dev = get_cpu_device(cpu);
		if (!cpu_dev) {
		pr_err("%s: failed to get cpu%d device\n", __func__,
		cpu);
		continue;
		}

		if (of)
		dev_pm_opp_of_remove_table(cpu_dev);
		else
		dev_pm_opp_remove_table(cpu_dev);
		}
		}

		/**
		* dev_pm_opp_cpumask_remove_table() - Removes OPP table for @cpumask
		* @cpumask: cpumask for which OPP table needs to be removed
		*
		* This removes the OPP tables for CPUs present in the @cpumask.
		* This should be used to remove all the OPPs entries associated with
		* the cpus in @cpumask.
		*
		* Locking: The internal opp_table and opp structures are RCU protected.
		* Hence this function internally uses RCU updater strategy with mutex locks
		* to keep the integrity of the internal data structures. Callers should ensure
		* that this function is NOT called under RCU protection or in contexts where
		* mutex cannot be locked.
		*/
		void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask)
		{
		_dev_pm_opp_cpumask_remove_table(cpumask, false);
		}
		EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table);

		/**
		* dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs
		* @cpu_dev: CPU device for which we do this operation
		* @cpumask: cpumask of the CPUs which share the OPP table with @cpu_dev
		*
		* This marks OPP table of the @cpu_dev as shared by the CPUs present in
		* @cpumask.
		*
		* Returns -ENODEV if OPP table isn't already present.
		*
		* Locking: The internal opp_table and opp structures are RCU protected.
		* Hence this function internally uses RCU updater strategy with mutex locks
		* to keep the integrity of the internal data structures. Callers should ensure
		* that this function is NOT called under RCU protection or in contexts where
		* mutex cannot be locked.
		*/
		int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
		const struct cpumask *cpumask)
		{
		struct opp_device *opp_dev;
		struct opp_table *opp_table;
		@@ -131,7 +188,7 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)

		opp_table = _find_opp_table(cpu_dev);
		if (IS_ERR(opp_table)) {
		ret = -EINVAL;
		ret = PTR_ERR(opp_table);
		goto unlock;
		}

		@@ -152,6 +209,9 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
		__func__, cpu);
		continue;
		}

		/* Mark opp-table as multiple CPUs are sharing it now */
		opp_table->shared_opp = true;
		}
		unlock:
		mutex_unlock(&opp_table_lock);
		@@ -160,112 +220,47 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
		}
		EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);

		#ifdef CONFIG_OF
		void dev_pm_opp_of_cpumask_remove_table(cpumask_var_t cpumask)
		{
		struct device *cpu_dev;
		int cpu;

		WARN_ON(cpumask_empty(cpumask));

		for_each_cpu(cpu, cpumask) {
		cpu_dev = get_cpu_device(cpu);
		if (!cpu_dev) {
		pr_err("%s: failed to get cpu%d device\n", __func__,
		cpu);
		continue;
		}

		dev_pm_opp_of_remove_table(cpu_dev);
		}
		}
		EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table);

		int dev_pm_opp_of_cpumask_add_table(cpumask_var_t cpumask)
		{
		struct device *cpu_dev;
		int cpu, ret = 0;

		WARN_ON(cpumask_empty(cpumask));

		for_each_cpu(cpu, cpumask) {
		cpu_dev = get_cpu_device(cpu);
		if (!cpu_dev) {
		pr_err("%s: failed to get cpu%d device\n", __func__,
		cpu);
		continue;
		}

		ret = dev_pm_opp_of_add_table(cpu_dev);
		if (ret) {
		pr_err("%s: couldn't find opp table for cpu:%d, %d\n",
		__func__, cpu, ret);

		/* Free all other OPPs */
		dev_pm_opp_of_cpumask_remove_table(cpumask);
		break;
		}
		}

		return ret;
		}
		EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table);

		/*
		* Works only for OPP v2 bindings.
		/**
		* dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev
		* @cpu_dev: CPU device for which we do this operation
		* @cpumask: cpumask to update with information of sharing CPUs
		*
		* This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
		*
		* Returns -ENOENT if operating-points-v2 bindings aren't supported.
		* Returns -ENODEV if OPP table isn't already present.
		*
		* Locking: The internal opp_table and opp structures are RCU protected.
		* Hence this function internally uses RCU updater strategy with mutex locks
		* to keep the integrity of the internal data structures. Callers should ensure
		* that this function is NOT called under RCU protection or in contexts where
		* mutex cannot be locked.
		*/
		int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
		int dev_pm_opp_get_sharing_cpus(struct device cpu_dev, struct cpumask cpumask)
		{
		struct device_node np, tmp_np;
		struct device *tcpu_dev;
		int cpu, ret = 0;

		/* Get OPP descriptor node */
		np = _of_get_opp_desc_node(cpu_dev);
		if (!np) {
		dev_dbg(cpu_dev, "%s: Couldn't find cpu_dev node.\n", __func__);
		return -ENOENT;
		}

		cpumask_set_cpu(cpu_dev->id, cpumask);

		/* OPPs are shared ? */
		if (!of_property_read_bool(np, "opp-shared"))
		goto put_cpu_node;

		for_each_possible_cpu(cpu) {
		if (cpu == cpu_dev->id)
		continue;
		struct opp_device *opp_dev;
		struct opp_table *opp_table;
		int ret = 0;

		tcpu_dev = get_cpu_device(cpu);
		if (!tcpu_dev) {
		dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
		__func__, cpu);
		ret = -ENODEV;
		goto put_cpu_node;
		}
		mutex_lock(&opp_table_lock);

		/* Get OPP descriptor node */
		tmp_np = _of_get_opp_desc_node(tcpu_dev);
		if (!tmp_np) {
		dev_err(tcpu_dev, "%s: Couldn't find tcpu_dev node.\n",
		__func__);
		ret = -ENOENT;
		goto put_cpu_node;
		opp_table = _find_opp_table(cpu_dev);
		if (IS_ERR(opp_table)) {
		ret = PTR_ERR(opp_table);
		goto unlock;
		}

		/* CPUs are sharing opp node */
		if (np == tmp_np)
		cpumask_set_cpu(cpu, cpumask);
		cpumask_clear(cpumask);

		of_node_put(tmp_np);
		if (opp_table->shared_opp) {
		list_for_each_entry(opp_dev, &opp_table->dev_list, node)
		cpumask_set_cpu(opp_dev->dev->id, cpumask);
		} else {
		cpumask_set_cpu(cpu_dev->id, cpumask);
		}

		put_cpu_node:
		of_node_put(np);
		unlock:
		mutex_unlock(&opp_table_lock);

		return ret;
		}
		EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus);
		#endif
		EXPORT_SYMBOL_GPL(dev_pm_opp_get_sharing_cpus);

drivers/base/power/opp/of.c

0 → 100644

+591 −0

File added.

Preview size limit exceeded, changes collapsed.

drivers/base/power/opp/opp.h

+14 −0

Original line number	Diff line number	Diff line
		@@ -28,6 +28,8 @@ struct regulator;
		/* Lock to allow exclusive modification to the device and opp lists */
		extern struct mutex opp_table_lock;

		extern struct list_head opp_tables;

		/*
		* Internal data structure organization with the OPP layer library is as
		* follows:
		@@ -183,6 +185,18 @@ struct opp_table {
		struct opp_table _find_opp_table(struct device dev);
		struct opp_device _add_opp_dev(const struct device dev, struct opp_table *opp_table);
		struct device_node _of_get_opp_desc_node(struct device dev);
		void _dev_pm_opp_remove_table(struct device *dev, bool remove_all);
		struct dev_pm_opp _allocate_opp(struct device dev, struct opp_table **opp_table);
		int _opp_add(struct device dev, struct dev_pm_opp new_opp, struct opp_table *opp_table);
		void _opp_remove(struct opp_table opp_table, struct dev_pm_opp opp, bool notify);
		int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, bool dynamic);
		void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of);

		#ifdef CONFIG_OF
		void _of_init_opp_table(struct opp_table opp_table, struct device dev);
		#else
		static inline void _of_init_opp_table(struct opp_table opp_table, struct device dev) {}
		#endif

		#ifdef CONFIG_DEBUG_FS
		void opp_debug_remove_one(struct dev_pm_opp *opp);