369 lines
8.8 KiB
C
369 lines
8.8 KiB
C
/*
|
|
* linux/drivers/cpufreq/freq_table.c
|
|
*
|
|
* Copyright (C) 2002 - 2003 Dominik Brodowski
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/module.h>
|
|
|
|
/*********************************************************************
|
|
* FREQUENCY TABLE HELPERS *
|
|
*********************************************************************/
|
|
|
|
bool policy_has_boost_freq(struct cpufreq_policy *policy)
|
|
{
|
|
struct cpufreq_frequency_table *pos, *table = policy->freq_table;
|
|
|
|
if (!table)
|
|
return false;
|
|
|
|
cpufreq_for_each_valid_entry(pos, table)
|
|
if (pos->flags & CPUFREQ_BOOST_FREQ)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(policy_has_boost_freq);
|
|
|
|
int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
|
|
struct cpufreq_frequency_table *table)
|
|
{
|
|
struct cpufreq_frequency_table *pos;
|
|
unsigned int min_freq = ~0;
|
|
unsigned int max_freq = 0;
|
|
unsigned int freq;
|
|
|
|
cpufreq_for_each_valid_entry(pos, table) {
|
|
freq = pos->frequency;
|
|
|
|
if (!cpufreq_boost_enabled()
|
|
&& (pos->flags & CPUFREQ_BOOST_FREQ))
|
|
continue;
|
|
|
|
pr_debug("table entry %u: %u kHz\n", (int)(pos - table), freq);
|
|
if (freq < min_freq)
|
|
min_freq = freq;
|
|
if (freq > max_freq)
|
|
max_freq = freq;
|
|
}
|
|
|
|
policy->min = policy->cpuinfo.min_freq = min_freq;
|
|
policy->max = policy->cpuinfo.max_freq = max_freq;
|
|
|
|
if (policy->min == ~0)
|
|
return -EINVAL;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
|
|
struct cpufreq_frequency_table *table)
|
|
{
|
|
struct cpufreq_frequency_table *pos;
|
|
unsigned int freq, next_larger = ~0;
|
|
bool found = false;
|
|
|
|
pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
|
|
policy->min, policy->max, policy->cpu);
|
|
|
|
cpufreq_verify_within_cpu_limits(policy);
|
|
|
|
cpufreq_for_each_valid_entry(pos, table) {
|
|
freq = pos->frequency;
|
|
|
|
if ((freq >= policy->min) && (freq <= policy->max)) {
|
|
found = true;
|
|
break;
|
|
}
|
|
|
|
if ((next_larger > freq) && (freq > policy->max))
|
|
next_larger = freq;
|
|
}
|
|
|
|
if (!found) {
|
|
policy->max = next_larger;
|
|
cpufreq_verify_within_cpu_limits(policy);
|
|
}
|
|
|
|
pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
|
|
policy->min, policy->max, policy->cpu);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
|
|
|
|
/*
|
|
* Generic routine to verify policy & frequency table, requires driver to set
|
|
* policy->freq_table prior to it.
|
|
*/
|
|
int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy)
|
|
{
|
|
if (!policy->freq_table)
|
|
return -ENODEV;
|
|
|
|
return cpufreq_frequency_table_verify(policy, policy->freq_table);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify);
|
|
|
|
int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
|
|
unsigned int target_freq,
|
|
unsigned int relation)
|
|
{
|
|
struct cpufreq_frequency_table optimal = {
|
|
.driver_data = ~0,
|
|
.frequency = 0,
|
|
};
|
|
struct cpufreq_frequency_table suboptimal = {
|
|
.driver_data = ~0,
|
|
.frequency = 0,
|
|
};
|
|
struct cpufreq_frequency_table *pos;
|
|
struct cpufreq_frequency_table *table = policy->freq_table;
|
|
unsigned int freq, diff, i = 0;
|
|
int index;
|
|
|
|
pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
|
|
target_freq, relation, policy->cpu);
|
|
|
|
switch (relation) {
|
|
case CPUFREQ_RELATION_H:
|
|
suboptimal.frequency = ~0;
|
|
break;
|
|
case CPUFREQ_RELATION_L:
|
|
case CPUFREQ_RELATION_C:
|
|
optimal.frequency = ~0;
|
|
break;
|
|
}
|
|
|
|
cpufreq_for_each_valid_entry_idx(pos, table, i) {
|
|
freq = pos->frequency;
|
|
|
|
if ((freq < policy->min) || (freq > policy->max))
|
|
continue;
|
|
if (freq == target_freq) {
|
|
optimal.driver_data = i;
|
|
break;
|
|
}
|
|
switch (relation) {
|
|
case CPUFREQ_RELATION_H:
|
|
if (freq < target_freq) {
|
|
if (freq >= optimal.frequency) {
|
|
optimal.frequency = freq;
|
|
optimal.driver_data = i;
|
|
}
|
|
} else {
|
|
if (freq <= suboptimal.frequency) {
|
|
suboptimal.frequency = freq;
|
|
suboptimal.driver_data = i;
|
|
}
|
|
}
|
|
break;
|
|
case CPUFREQ_RELATION_L:
|
|
if (freq > target_freq) {
|
|
if (freq <= optimal.frequency) {
|
|
optimal.frequency = freq;
|
|
optimal.driver_data = i;
|
|
}
|
|
} else {
|
|
if (freq >= suboptimal.frequency) {
|
|
suboptimal.frequency = freq;
|
|
suboptimal.driver_data = i;
|
|
}
|
|
}
|
|
break;
|
|
case CPUFREQ_RELATION_C:
|
|
diff = abs(freq - target_freq);
|
|
if (diff < optimal.frequency ||
|
|
(diff == optimal.frequency &&
|
|
freq > table[optimal.driver_data].frequency)) {
|
|
optimal.frequency = diff;
|
|
optimal.driver_data = i;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
if (optimal.driver_data > i) {
|
|
if (suboptimal.driver_data > i) {
|
|
WARN(1, "Invalid frequency table: %d\n", policy->cpu);
|
|
return 0;
|
|
}
|
|
|
|
index = suboptimal.driver_data;
|
|
} else
|
|
index = optimal.driver_data;
|
|
|
|
pr_debug("target index is %u, freq is:%u kHz\n", index,
|
|
table[index].frequency);
|
|
return index;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_table_index_unsorted);
|
|
|
|
int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
|
|
unsigned int freq)
|
|
{
|
|
struct cpufreq_frequency_table *pos, *table = policy->freq_table;
|
|
int idx;
|
|
|
|
if (unlikely(!table)) {
|
|
pr_debug("%s: Unable to find frequency table\n", __func__);
|
|
return -ENOENT;
|
|
}
|
|
|
|
cpufreq_for_each_valid_entry_idx(pos, table, idx)
|
|
if (pos->frequency == freq)
|
|
return idx;
|
|
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_index);
|
|
|
|
/**
|
|
* show_available_freqs - show available frequencies for the specified CPU
|
|
*/
|
|
static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf,
|
|
bool show_boost)
|
|
{
|
|
ssize_t count = 0;
|
|
struct cpufreq_frequency_table *pos, *table = policy->freq_table;
|
|
|
|
if (!table)
|
|
return -ENODEV;
|
|
|
|
cpufreq_for_each_valid_entry(pos, table) {
|
|
/*
|
|
* show_boost = true and driver_data = BOOST freq
|
|
* display BOOST freqs
|
|
*
|
|
* show_boost = false and driver_data = BOOST freq
|
|
* show_boost = true and driver_data != BOOST freq
|
|
* continue - do not display anything
|
|
*
|
|
* show_boost = false and driver_data != BOOST freq
|
|
* display NON BOOST freqs
|
|
*/
|
|
if (show_boost ^ (pos->flags & CPUFREQ_BOOST_FREQ))
|
|
continue;
|
|
|
|
count += sprintf(&buf[count], "%d ", pos->frequency);
|
|
}
|
|
count += sprintf(&buf[count], "\n");
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
#define cpufreq_attr_available_freq(_name) \
|
|
struct freq_attr cpufreq_freq_attr_##_name##_freqs = \
|
|
__ATTR_RO(_name##_frequencies)
|
|
|
|
/**
|
|
* show_scaling_available_frequencies - show available normal frequencies for
|
|
* the specified CPU
|
|
*/
|
|
static ssize_t scaling_available_frequencies_show(struct cpufreq_policy *policy,
|
|
char *buf)
|
|
{
|
|
return show_available_freqs(policy, buf, false);
|
|
}
|
|
cpufreq_attr_available_freq(scaling_available);
|
|
EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
|
|
|
|
/**
|
|
* show_available_boost_freqs - show available boost frequencies for
|
|
* the specified CPU
|
|
*/
|
|
static ssize_t scaling_boost_frequencies_show(struct cpufreq_policy *policy,
|
|
char *buf)
|
|
{
|
|
return show_available_freqs(policy, buf, true);
|
|
}
|
|
cpufreq_attr_available_freq(scaling_boost);
|
|
EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_boost_freqs);
|
|
|
|
struct freq_attr *cpufreq_generic_attr[] = {
|
|
&cpufreq_freq_attr_scaling_available_freqs,
|
|
NULL,
|
|
};
|
|
EXPORT_SYMBOL_GPL(cpufreq_generic_attr);
|
|
|
|
static int set_freq_table_sorted(struct cpufreq_policy *policy)
|
|
{
|
|
struct cpufreq_frequency_table *pos, *table = policy->freq_table;
|
|
struct cpufreq_frequency_table *prev = NULL;
|
|
int ascending = 0;
|
|
|
|
policy->freq_table_sorted = CPUFREQ_TABLE_UNSORTED;
|
|
|
|
cpufreq_for_each_valid_entry(pos, table) {
|
|
if (!prev) {
|
|
prev = pos;
|
|
continue;
|
|
}
|
|
|
|
if (pos->frequency == prev->frequency) {
|
|
pr_warn("Duplicate freq-table entries: %u\n",
|
|
pos->frequency);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Frequency increased from prev to pos */
|
|
if (pos->frequency > prev->frequency) {
|
|
/* But frequency was decreasing earlier */
|
|
if (ascending < 0) {
|
|
pr_debug("Freq table is unsorted\n");
|
|
return 0;
|
|
}
|
|
|
|
ascending++;
|
|
} else {
|
|
/* Frequency decreased from prev to pos */
|
|
|
|
/* But frequency was increasing earlier */
|
|
if (ascending > 0) {
|
|
pr_debug("Freq table is unsorted\n");
|
|
return 0;
|
|
}
|
|
|
|
ascending--;
|
|
}
|
|
|
|
prev = pos;
|
|
}
|
|
|
|
if (ascending > 0)
|
|
policy->freq_table_sorted = CPUFREQ_TABLE_SORTED_ASCENDING;
|
|
else
|
|
policy->freq_table_sorted = CPUFREQ_TABLE_SORTED_DESCENDING;
|
|
|
|
pr_debug("Freq table is sorted in %s order\n",
|
|
ascending > 0 ? "ascending" : "descending");
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy)
|
|
{
|
|
int ret;
|
|
|
|
if (!policy->freq_table)
|
|
return 0;
|
|
|
|
ret = cpufreq_frequency_table_cpuinfo(policy, policy->freq_table);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return set_freq_table_sorted(policy);
|
|
}
|
|
|
|
MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
|
|
MODULE_DESCRIPTION("CPUfreq frequency table helpers");
|
|
MODULE_LICENSE("GPL");
|