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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229// 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 * @opp_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 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 = kzalloc_objs(*freq_table, (max_opps + 1)); if (!freq_table) return -ENOMEM;
for (i = 0, rate = 0; i < max_opps; i++, rate++) { /* find next rate */ struct dev_pm_opp *opp __free(put_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; }
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 * @opp_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 device *dev; int cpu;
struct opp_table *opp_table __free(put_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; }
return 0;}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 __free(put_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) return -EINVAL;
cpumask_clear(cpumask);
if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) { guard(mutex)(&opp_table->lock); 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); }
return 0;}EXPORT_SYMBOL_GPL(dev_pm_opp_get_sharing_cpus);