// SPDX-License-Identifier: GPL-2.0-only/* * Generic OPP helper interface for CPU device * * Copyright (C) 2009-2014 Texas Instruments Incorporated. *	Nishanth Menon *	Romit Dasgupta *	Kevin Hilman */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/cpu.h>#include <linux/cpufreq.h>#include <linux/err.h>#include <linux/errno.h>#include <linux/export.h>#include <linux/slab.h> #include "opp.h" #ifdef CONFIG_CPU_FREQ /** * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device * @dev:	device for which we do this operation * @table:	Cpufreq table returned back to caller * * Generate a cpufreq table for a provided device- this assumes that the * opp table is already initialized and ready for usage. * * This function allocates required memory for the cpufreq table. It is * expected that the caller does the required maintenance such as freeing * the table as required. * * Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM * if no memory available for the operation (table is not populated), returns 0 * if successful and table is populated. * * WARNING: It is  important for the callers to ensure refreshing their copy of * the table if any of the mentioned functions have been invoked in the interim. */int dev_pm_opp_init_cpufreq_table(struct device *dev,				  struct cpufreq_frequency_table **opp_table){	struct dev_pm_opp *opp;	struct cpufreq_frequency_table *freq_table = NULL;	int i, max_opps, ret = 0;	unsigned long rate; 	max_opps = dev_pm_opp_get_opp_count(dev);	if (max_opps <= 0)		return max_opps ? max_opps : -ENODATA; 	freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_KERNEL);	if (!freq_table)		return -ENOMEM; 	for (i = 0, rate = 0; i < max_opps; i++, rate++) {		/* find next rate */		opp = dev_pm_opp_find_freq_ceil(dev, &rate);		if (IS_ERR(opp)) {			ret = PTR_ERR(opp);			goto out;		}		freq_table[i].driver_data = i;		freq_table[i].frequency = rate / 1000; 		/* Is Boost/turbo opp ? */		if (dev_pm_opp_is_turbo(opp))			freq_table[i].flags = CPUFREQ_BOOST_FREQ; 		dev_pm_opp_put(opp);	} 	freq_table[i].driver_data = i;	freq_table[i].frequency = CPUFREQ_TABLE_END; 	*opp_table = &freq_table[0]; out:	if (ret)		kfree(freq_table); 	return ret;}EXPORT_SYMBOL_GPL(dev_pm_opp_init_cpufreq_table); /** * dev_pm_opp_free_cpufreq_table() - free the cpufreq table * @dev:	device for which we do this operation * @table:	table to free * * Free up the table allocated by dev_pm_opp_init_cpufreq_table */void dev_pm_opp_free_cpufreq_table(struct device *dev,				   struct cpufreq_frequency_table **opp_table){	if (!opp_table)		return; 	kfree(*opp_table);	*opp_table = NULL;}EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);#endif	/* CONFIG_CPU_FREQ */ void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask,				      int last_cpu){	struct device *cpu_dev;	int cpu; 	WARN_ON(cpumask_empty(cpumask)); 	for_each_cpu(cpu, cpumask) {		if (cpu == last_cpu)			break; 		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_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. */void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask){	_dev_pm_opp_cpumask_remove_table(cpumask, -1);}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. */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;	struct device *dev;	int cpu, ret = 0; 	opp_table = _find_opp_table(cpu_dev);	if (IS_ERR(opp_table))		return PTR_ERR(opp_table); 	for_each_cpu(cpu, cpumask) {		if (cpu == cpu_dev->id)			continue; 		dev = get_cpu_device(cpu);		if (!dev) {			dev_err(cpu_dev, "%s: failed to get cpu%d device\n",				__func__, cpu);			continue;		} 		opp_dev = _add_opp_dev(dev, opp_table);		if (!opp_dev) {			dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n",				__func__, cpu);			continue;		} 		/* Mark opp-table as multiple CPUs are sharing it now */		opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;	} 	dev_pm_opp_put_opp_table(opp_table); 	return ret;}EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus); /** * 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 -ENODEV if OPP table isn't already present and -EINVAL if the OPP * table's status is access-unknown. */int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask){	struct opp_device *opp_dev;	struct opp_table *opp_table;	int ret = 0; 	opp_table = _find_opp_table(cpu_dev);	if (IS_ERR(opp_table))		return PTR_ERR(opp_table); 	if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) {		ret = -EINVAL;		goto put_opp_table;	} 	cpumask_clear(cpumask); 	if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {		mutex_lock(&opp_table->lock);		list_for_each_entry(opp_dev, &opp_table->dev_list, node)			cpumask_set_cpu(opp_dev->dev->id, cpumask);		mutex_unlock(&opp_table->lock);	} else {		cpumask_set_cpu(cpu_dev->id, cpumask);	} put_opp_table:	dev_pm_opp_put_opp_table(opp_table); 	return ret;}EXPORT_SYMBOL_GPL(dev_pm_opp_get_sharing_cpus);