Commit 29cff184 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

Merge branch 'pm-opp' 

* pm-opp:
  PM / OPP: Move CONFIG_OF dependent code in a separate file
  PM / OPP: add non-OF versions of dev_pm_opp_{cpumask_, }remove_table
  PM / OPP: pass cpumask by reference
  PM / OPP: Add dev_pm_opp_get_sharing_cpus()
  PM / OPP: Mark cpumask as const in dev_pm_opp_set_sharing_cpus()
  PM / OPP: -ENOSYS is applicable only to syscalls
  PM / OPP: Mark shared-opp for non-dt case
  PM / OPP: Relocate dev_pm_opp_set_sharing_cpus()
  PM / OPP: dev_pm_opp_set_sharing_cpus() doesn't depend on CONFIG_OF
  PM / OPP: Add missing doc style comments
  PM / OPP: Propagate the error returned by _find_opp_table()
parents 44549e8f c8541203

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 @@ unlock: 
}

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 @@ unlock: 
	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 @@ unlock: 
}

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 @@ unlock: 
}

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);

CRA Git | Maintained and supported by SUSTech CRA and CCSE