mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
f16250669d
This patch updates percpu related symbols in cpufreq such that percpu symbols are unique and don't clash with local symbols. This serves two purposes of decreasing the possibility of global percpu symbol collision and allowing dropping per_cpu__ prefix from percpu symbols. * drivers/cpufreq/cpufreq.c: s/policy_cpu/cpufreq_policy_cpu/ * drivers/cpufreq/freq_table.c: s/show_table/cpufreq_show_table/ * arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c: s/drv_data/acfreq_data/ s/old_perf/acfreq_old_perf/ Partly based on Rusty Russell's "alloc_percpu: rename percpu vars which cause name clashes" patch. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Rusty Russell <rusty@rustcorp.com.au>
240 lines
6.1 KiB
C
240 lines
6.1 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.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/cpufreq.h>
|
|
|
|
#define dprintk(msg...) \
|
|
cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "freq-table", msg)
|
|
|
|
/*********************************************************************
|
|
* FREQUENCY TABLE HELPERS *
|
|
*********************************************************************/
|
|
|
|
int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
|
|
struct cpufreq_frequency_table *table)
|
|
{
|
|
unsigned int min_freq = ~0;
|
|
unsigned int max_freq = 0;
|
|
unsigned int i;
|
|
|
|
for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
|
|
unsigned int freq = table[i].frequency;
|
|
if (freq == CPUFREQ_ENTRY_INVALID) {
|
|
dprintk("table entry %u is invalid, skipping\n", i);
|
|
|
|
continue;
|
|
}
|
|
dprintk("table entry %u: %u kHz, %u index\n",
|
|
i, freq, table[i].index);
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo);
|
|
|
|
|
|
int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
|
|
struct cpufreq_frequency_table *table)
|
|
{
|
|
unsigned int next_larger = ~0;
|
|
unsigned int i;
|
|
unsigned int count = 0;
|
|
|
|
dprintk("request for verification of policy (%u - %u kHz) for cpu %u\n",
|
|
policy->min, policy->max, policy->cpu);
|
|
|
|
if (!cpu_online(policy->cpu))
|
|
return -EINVAL;
|
|
|
|
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
|
|
policy->cpuinfo.max_freq);
|
|
|
|
for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
|
|
unsigned int freq = table[i].frequency;
|
|
if (freq == CPUFREQ_ENTRY_INVALID)
|
|
continue;
|
|
if ((freq >= policy->min) && (freq <= policy->max))
|
|
count++;
|
|
else if ((next_larger > freq) && (freq > policy->max))
|
|
next_larger = freq;
|
|
}
|
|
|
|
if (!count)
|
|
policy->max = next_larger;
|
|
|
|
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
|
|
policy->cpuinfo.max_freq);
|
|
|
|
dprintk("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);
|
|
|
|
|
|
int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
|
|
struct cpufreq_frequency_table *table,
|
|
unsigned int target_freq,
|
|
unsigned int relation,
|
|
unsigned int *index)
|
|
{
|
|
struct cpufreq_frequency_table optimal = {
|
|
.index = ~0,
|
|
.frequency = 0,
|
|
};
|
|
struct cpufreq_frequency_table suboptimal = {
|
|
.index = ~0,
|
|
.frequency = 0,
|
|
};
|
|
unsigned int i;
|
|
|
|
dprintk("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:
|
|
optimal.frequency = ~0;
|
|
break;
|
|
}
|
|
|
|
if (!cpu_online(policy->cpu))
|
|
return -EINVAL;
|
|
|
|
for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
|
|
unsigned int freq = table[i].frequency;
|
|
if (freq == CPUFREQ_ENTRY_INVALID)
|
|
continue;
|
|
if ((freq < policy->min) || (freq > policy->max))
|
|
continue;
|
|
switch (relation) {
|
|
case CPUFREQ_RELATION_H:
|
|
if (freq <= target_freq) {
|
|
if (freq >= optimal.frequency) {
|
|
optimal.frequency = freq;
|
|
optimal.index = i;
|
|
}
|
|
} else {
|
|
if (freq <= suboptimal.frequency) {
|
|
suboptimal.frequency = freq;
|
|
suboptimal.index = i;
|
|
}
|
|
}
|
|
break;
|
|
case CPUFREQ_RELATION_L:
|
|
if (freq >= target_freq) {
|
|
if (freq <= optimal.frequency) {
|
|
optimal.frequency = freq;
|
|
optimal.index = i;
|
|
}
|
|
} else {
|
|
if (freq >= suboptimal.frequency) {
|
|
suboptimal.frequency = freq;
|
|
suboptimal.index = i;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
if (optimal.index > i) {
|
|
if (suboptimal.index > i)
|
|
return -EINVAL;
|
|
*index = suboptimal.index;
|
|
} else
|
|
*index = optimal.index;
|
|
|
|
dprintk("target is %u (%u kHz, %u)\n", *index, table[*index].frequency,
|
|
table[*index].index);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
|
|
|
|
static DEFINE_PER_CPU(struct cpufreq_frequency_table *, cpufreq_show_table);
|
|
/**
|
|
* show_available_freqs - show available frequencies for the specified CPU
|
|
*/
|
|
static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf)
|
|
{
|
|
unsigned int i = 0;
|
|
unsigned int cpu = policy->cpu;
|
|
ssize_t count = 0;
|
|
struct cpufreq_frequency_table *table;
|
|
|
|
if (!per_cpu(cpufreq_show_table, cpu))
|
|
return -ENODEV;
|
|
|
|
table = per_cpu(cpufreq_show_table, cpu);
|
|
|
|
for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
|
|
if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
|
|
continue;
|
|
count += sprintf(&buf[count], "%d ", table[i].frequency);
|
|
}
|
|
count += sprintf(&buf[count], "\n");
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
struct freq_attr cpufreq_freq_attr_scaling_available_freqs = {
|
|
.attr = { .name = "scaling_available_frequencies",
|
|
.mode = 0444,
|
|
},
|
|
.show = show_available_freqs,
|
|
};
|
|
EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
|
|
|
|
/*
|
|
* if you use these, you must assure that the frequency table is valid
|
|
* all the time between get_attr and put_attr!
|
|
*/
|
|
void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
|
|
unsigned int cpu)
|
|
{
|
|
dprintk("setting show_table for cpu %u to %p\n", cpu, table);
|
|
per_cpu(cpufreq_show_table, cpu) = table;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr);
|
|
|
|
void cpufreq_frequency_table_put_attr(unsigned int cpu)
|
|
{
|
|
dprintk("clearing show_table for cpu %u\n", cpu);
|
|
per_cpu(cpufreq_show_table, cpu) = NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);
|
|
|
|
struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
|
|
{
|
|
return per_cpu(cpufreq_show_table, cpu);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
|
|
|
|
MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
|
|
MODULE_DESCRIPTION("CPUfreq frequency table helpers");
|
|
MODULE_LICENSE("GPL");
|