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