371 lines
8.8 KiB
C
371 lines
8.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/drivers/cpufreq/freq_table.c
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*
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* Copyright (C) 2002 - 2003 Dominik Brodowski
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/cpufreq.h>
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#include <linux/module.h>
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/*********************************************************************
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* FREQUENCY TABLE HELPERS *
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*********************************************************************/
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bool policy_has_boost_freq(struct cpufreq_policy *policy)
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{
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struct cpufreq_frequency_table *pos, *table = policy->freq_table;
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if (!table)
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return false;
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cpufreq_for_each_valid_entry(pos, table)
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if (pos->flags & CPUFREQ_BOOST_FREQ)
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return true;
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return false;
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}
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EXPORT_SYMBOL_GPL(policy_has_boost_freq);
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int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
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struct cpufreq_frequency_table *table)
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{
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struct cpufreq_frequency_table *pos;
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unsigned int min_freq = ~0;
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unsigned int max_freq = 0;
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unsigned int freq;
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cpufreq_for_each_valid_entry(pos, table) {
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freq = pos->frequency;
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if (!cpufreq_boost_enabled()
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&& (pos->flags & CPUFREQ_BOOST_FREQ))
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continue;
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pr_debug("table entry %u: %u kHz\n", (int)(pos - table), freq);
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if (freq < min_freq)
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min_freq = freq;
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if (freq > max_freq)
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max_freq = freq;
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}
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policy->min = policy->cpuinfo.min_freq = min_freq;
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policy->max = max_freq;
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/*
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* If the driver has set its own cpuinfo.max_freq above max_freq, leave
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* it as is.
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*/
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if (policy->cpuinfo.max_freq < max_freq)
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policy->max = policy->cpuinfo.max_freq = max_freq;
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if (policy->min == ~0)
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return -EINVAL;
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else
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return 0;
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}
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int cpufreq_frequency_table_verify(struct cpufreq_policy_data *policy,
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struct cpufreq_frequency_table *table)
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{
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struct cpufreq_frequency_table *pos;
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unsigned int freq, next_larger = ~0;
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bool found = false;
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pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
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policy->min, policy->max, policy->cpu);
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cpufreq_verify_within_cpu_limits(policy);
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cpufreq_for_each_valid_entry(pos, table) {
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freq = pos->frequency;
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if ((freq >= policy->min) && (freq <= policy->max)) {
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found = true;
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break;
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}
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if ((next_larger > freq) && (freq > policy->max))
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next_larger = freq;
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}
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if (!found) {
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policy->max = next_larger;
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cpufreq_verify_within_cpu_limits(policy);
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}
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pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
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policy->min, policy->max, policy->cpu);
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return 0;
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}
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EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
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/*
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* Generic routine to verify policy & frequency table, requires driver to set
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* policy->freq_table prior to it.
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*/
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int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data *policy)
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{
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if (!policy->freq_table)
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return -ENODEV;
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return cpufreq_frequency_table_verify(policy, policy->freq_table);
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}
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EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify);
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int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation)
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{
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struct cpufreq_frequency_table optimal = {
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.driver_data = ~0,
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.frequency = 0,
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};
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struct cpufreq_frequency_table suboptimal = {
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.driver_data = ~0,
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.frequency = 0,
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};
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struct cpufreq_frequency_table *pos;
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struct cpufreq_frequency_table *table = policy->freq_table;
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unsigned int freq, diff, i = 0;
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int index;
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pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
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target_freq, relation, policy->cpu);
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switch (relation) {
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case CPUFREQ_RELATION_H:
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suboptimal.frequency = ~0;
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break;
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case CPUFREQ_RELATION_L:
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case CPUFREQ_RELATION_C:
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optimal.frequency = ~0;
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break;
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}
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cpufreq_for_each_valid_entry_idx(pos, table, i) {
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freq = pos->frequency;
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if ((freq < policy->min) || (freq > policy->max))
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continue;
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if (freq == target_freq) {
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optimal.driver_data = i;
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break;
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}
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switch (relation) {
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case CPUFREQ_RELATION_H:
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if (freq < target_freq) {
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if (freq >= optimal.frequency) {
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optimal.frequency = freq;
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optimal.driver_data = i;
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}
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} else {
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if (freq <= suboptimal.frequency) {
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suboptimal.frequency = freq;
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suboptimal.driver_data = i;
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}
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}
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break;
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case CPUFREQ_RELATION_L:
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if (freq > target_freq) {
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if (freq <= optimal.frequency) {
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optimal.frequency = freq;
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optimal.driver_data = i;
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}
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} else {
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if (freq >= suboptimal.frequency) {
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suboptimal.frequency = freq;
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suboptimal.driver_data = i;
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}
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}
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break;
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case CPUFREQ_RELATION_C:
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diff = abs(freq - target_freq);
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if (diff < optimal.frequency ||
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(diff == optimal.frequency &&
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freq > table[optimal.driver_data].frequency)) {
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optimal.frequency = diff;
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optimal.driver_data = i;
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}
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break;
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}
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}
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if (optimal.driver_data > i) {
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if (suboptimal.driver_data > i) {
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WARN(1, "Invalid frequency table: %d\n", policy->cpu);
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return 0;
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}
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index = suboptimal.driver_data;
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} else
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index = optimal.driver_data;
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pr_debug("target index is %u, freq is:%u kHz\n", index,
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table[index].frequency);
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return index;
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}
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EXPORT_SYMBOL_GPL(cpufreq_table_index_unsorted);
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int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
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unsigned int freq)
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{
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struct cpufreq_frequency_table *pos, *table = policy->freq_table;
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int idx;
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if (unlikely(!table)) {
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pr_debug("%s: Unable to find frequency table\n", __func__);
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return -ENOENT;
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}
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cpufreq_for_each_valid_entry_idx(pos, table, idx)
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if (pos->frequency == freq)
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return idx;
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_index);
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/*
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* show_available_freqs - show available frequencies for the specified CPU
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*/
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static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf,
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bool show_boost)
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{
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ssize_t count = 0;
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struct cpufreq_frequency_table *pos, *table = policy->freq_table;
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if (!table)
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return -ENODEV;
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cpufreq_for_each_valid_entry(pos, table) {
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/*
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* show_boost = true and driver_data = BOOST freq
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* display BOOST freqs
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*
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* show_boost = false and driver_data = BOOST freq
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* show_boost = true and driver_data != BOOST freq
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* continue - do not display anything
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*
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* show_boost = false and driver_data != BOOST freq
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* display NON BOOST freqs
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*/
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if (show_boost ^ (pos->flags & CPUFREQ_BOOST_FREQ))
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continue;
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count += sprintf(&buf[count], "%d ", pos->frequency);
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}
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count += sprintf(&buf[count], "\n");
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return count;
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}
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#define cpufreq_attr_available_freq(_name) \
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struct freq_attr cpufreq_freq_attr_##_name##_freqs = \
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__ATTR_RO(_name##_frequencies)
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/*
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* scaling_available_frequencies_show - show available normal frequencies for
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* the specified CPU
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*/
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static ssize_t scaling_available_frequencies_show(struct cpufreq_policy *policy,
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char *buf)
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{
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return show_available_freqs(policy, buf, false);
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}
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cpufreq_attr_available_freq(scaling_available);
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EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
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/*
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* scaling_boost_frequencies_show - show available boost frequencies for
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* the specified CPU
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*/
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static ssize_t scaling_boost_frequencies_show(struct cpufreq_policy *policy,
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char *buf)
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{
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return show_available_freqs(policy, buf, true);
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}
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cpufreq_attr_available_freq(scaling_boost);
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EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_boost_freqs);
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struct freq_attr *cpufreq_generic_attr[] = {
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&cpufreq_freq_attr_scaling_available_freqs,
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NULL,
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};
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EXPORT_SYMBOL_GPL(cpufreq_generic_attr);
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static int set_freq_table_sorted(struct cpufreq_policy *policy)
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{
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struct cpufreq_frequency_table *pos, *table = policy->freq_table;
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struct cpufreq_frequency_table *prev = NULL;
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int ascending = 0;
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policy->freq_table_sorted = CPUFREQ_TABLE_UNSORTED;
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cpufreq_for_each_valid_entry(pos, table) {
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if (!prev) {
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prev = pos;
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continue;
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}
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if (pos->frequency == prev->frequency) {
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pr_warn("Duplicate freq-table entries: %u\n",
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pos->frequency);
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return -EINVAL;
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}
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/* Frequency increased from prev to pos */
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if (pos->frequency > prev->frequency) {
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/* But frequency was decreasing earlier */
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if (ascending < 0) {
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pr_debug("Freq table is unsorted\n");
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return 0;
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}
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ascending++;
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} else {
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/* Frequency decreased from prev to pos */
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/* But frequency was increasing earlier */
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if (ascending > 0) {
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pr_debug("Freq table is unsorted\n");
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return 0;
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}
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ascending--;
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}
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prev = pos;
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}
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if (ascending > 0)
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policy->freq_table_sorted = CPUFREQ_TABLE_SORTED_ASCENDING;
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else
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policy->freq_table_sorted = CPUFREQ_TABLE_SORTED_DESCENDING;
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pr_debug("Freq table is sorted in %s order\n",
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ascending > 0 ? "ascending" : "descending");
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return 0;
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}
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int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy)
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{
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int ret;
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if (!policy->freq_table)
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return 0;
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ret = cpufreq_frequency_table_cpuinfo(policy, policy->freq_table);
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if (ret)
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return ret;
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return set_freq_table_sorted(policy);
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}
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MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
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MODULE_DESCRIPTION("CPUfreq frequency table helpers");
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MODULE_LICENSE("GPL");
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