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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2d06d8c49a
With dynamic debug having gained the capability to report debug messages also during the boot process, it offers a far superior interface for debug messages than the custom cpufreq infrastructure. As a first step, remove the old cpufreq_debug_printk() function and replace it with a call to the generic pr_debug() function. How can dynamic debug be used on cpufreq? You need a kernel which has CONFIG_DYNAMIC_DEBUG enabled. To enabled debugging during runtime, mount debugfs and $ echo -n 'module cpufreq +p' > /sys/kernel/debug/dynamic_debug/control for debugging the complete "cpufreq" module. To achieve the same goal during boot, append ddebug_query="module cpufreq +p" as a boot parameter to the kernel of your choice. For more detailled instructions, please see Documentation/dynamic-debug-howto.txt Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Dave Jones <davej@redhat.com>
221 lines
5.9 KiB
C
221 lines
5.9 KiB
C
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/*
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* linux/drivers/cpufreq/cpufreq_userspace.c
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*
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* Copyright (C) 2001 Russell King
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* (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/cpufreq.h>
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#include <linux/cpu.h>
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/sysfs.h>
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#include <linux/mutex.h>
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/**
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* A few values needed by the userspace governor
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*/
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static DEFINE_PER_CPU(unsigned int, cpu_max_freq);
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static DEFINE_PER_CPU(unsigned int, cpu_min_freq);
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static DEFINE_PER_CPU(unsigned int, cpu_cur_freq); /* current CPU freq */
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static DEFINE_PER_CPU(unsigned int, cpu_set_freq); /* CPU freq desired by
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userspace */
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static DEFINE_PER_CPU(unsigned int, cpu_is_managed);
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static DEFINE_MUTEX(userspace_mutex);
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static int cpus_using_userspace_governor;
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/* keep track of frequency transitions */
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static int
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userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
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void *data)
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{
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struct cpufreq_freqs *freq = data;
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if (!per_cpu(cpu_is_managed, freq->cpu))
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return 0;
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pr_debug("saving cpu_cur_freq of cpu %u to be %u kHz\n",
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freq->cpu, freq->new);
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per_cpu(cpu_cur_freq, freq->cpu) = freq->new;
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return 0;
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}
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static struct notifier_block userspace_cpufreq_notifier_block = {
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.notifier_call = userspace_cpufreq_notifier
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};
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/**
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* cpufreq_set - set the CPU frequency
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* @policy: pointer to policy struct where freq is being set
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* @freq: target frequency in kHz
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*
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* Sets the CPU frequency to freq.
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*/
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static int cpufreq_set(struct cpufreq_policy *policy, unsigned int freq)
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{
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int ret = -EINVAL;
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pr_debug("cpufreq_set for cpu %u, freq %u kHz\n", policy->cpu, freq);
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mutex_lock(&userspace_mutex);
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if (!per_cpu(cpu_is_managed, policy->cpu))
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goto err;
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per_cpu(cpu_set_freq, policy->cpu) = freq;
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if (freq < per_cpu(cpu_min_freq, policy->cpu))
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freq = per_cpu(cpu_min_freq, policy->cpu);
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if (freq > per_cpu(cpu_max_freq, policy->cpu))
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freq = per_cpu(cpu_max_freq, policy->cpu);
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/*
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* We're safe from concurrent calls to ->target() here
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* as we hold the userspace_mutex lock. If we were calling
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* cpufreq_driver_target, a deadlock situation might occur:
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* A: cpufreq_set (lock userspace_mutex) ->
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* cpufreq_driver_target(lock policy->lock)
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* B: cpufreq_set_policy(lock policy->lock) ->
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* __cpufreq_governor ->
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* cpufreq_governor_userspace (lock userspace_mutex)
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*/
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ret = __cpufreq_driver_target(policy, freq, CPUFREQ_RELATION_L);
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err:
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mutex_unlock(&userspace_mutex);
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return ret;
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}
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static ssize_t show_speed(struct cpufreq_policy *policy, char *buf)
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{
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return sprintf(buf, "%u\n", per_cpu(cpu_cur_freq, policy->cpu));
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}
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static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
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unsigned int event)
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{
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unsigned int cpu = policy->cpu;
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int rc = 0;
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switch (event) {
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case CPUFREQ_GOV_START:
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if (!cpu_online(cpu))
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return -EINVAL;
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BUG_ON(!policy->cur);
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mutex_lock(&userspace_mutex);
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if (cpus_using_userspace_governor == 0) {
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cpufreq_register_notifier(
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&userspace_cpufreq_notifier_block,
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CPUFREQ_TRANSITION_NOTIFIER);
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}
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cpus_using_userspace_governor++;
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per_cpu(cpu_is_managed, cpu) = 1;
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per_cpu(cpu_min_freq, cpu) = policy->min;
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per_cpu(cpu_max_freq, cpu) = policy->max;
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per_cpu(cpu_cur_freq, cpu) = policy->cur;
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per_cpu(cpu_set_freq, cpu) = policy->cur;
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pr_debug("managing cpu %u started "
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"(%u - %u kHz, currently %u kHz)\n",
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cpu,
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per_cpu(cpu_min_freq, cpu),
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per_cpu(cpu_max_freq, cpu),
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per_cpu(cpu_cur_freq, cpu));
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mutex_unlock(&userspace_mutex);
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break;
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case CPUFREQ_GOV_STOP:
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mutex_lock(&userspace_mutex);
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cpus_using_userspace_governor--;
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if (cpus_using_userspace_governor == 0) {
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cpufreq_unregister_notifier(
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&userspace_cpufreq_notifier_block,
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CPUFREQ_TRANSITION_NOTIFIER);
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}
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per_cpu(cpu_is_managed, cpu) = 0;
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per_cpu(cpu_min_freq, cpu) = 0;
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per_cpu(cpu_max_freq, cpu) = 0;
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per_cpu(cpu_set_freq, cpu) = 0;
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pr_debug("managing cpu %u stopped\n", cpu);
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mutex_unlock(&userspace_mutex);
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break;
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case CPUFREQ_GOV_LIMITS:
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mutex_lock(&userspace_mutex);
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pr_debug("limit event for cpu %u: %u - %u kHz, "
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"currently %u kHz, last set to %u kHz\n",
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cpu, policy->min, policy->max,
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per_cpu(cpu_cur_freq, cpu),
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per_cpu(cpu_set_freq, cpu));
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if (policy->max < per_cpu(cpu_set_freq, cpu)) {
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__cpufreq_driver_target(policy, policy->max,
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CPUFREQ_RELATION_H);
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} else if (policy->min > per_cpu(cpu_set_freq, cpu)) {
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__cpufreq_driver_target(policy, policy->min,
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CPUFREQ_RELATION_L);
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} else {
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__cpufreq_driver_target(policy,
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per_cpu(cpu_set_freq, cpu),
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CPUFREQ_RELATION_L);
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}
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per_cpu(cpu_min_freq, cpu) = policy->min;
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per_cpu(cpu_max_freq, cpu) = policy->max;
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per_cpu(cpu_cur_freq, cpu) = policy->cur;
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mutex_unlock(&userspace_mutex);
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break;
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}
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return rc;
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}
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#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE
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static
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#endif
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struct cpufreq_governor cpufreq_gov_userspace = {
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.name = "userspace",
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.governor = cpufreq_governor_userspace,
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.store_setspeed = cpufreq_set,
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.show_setspeed = show_speed,
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.owner = THIS_MODULE,
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};
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static int __init cpufreq_gov_userspace_init(void)
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{
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return cpufreq_register_governor(&cpufreq_gov_userspace);
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}
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static void __exit cpufreq_gov_userspace_exit(void)
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{
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cpufreq_unregister_governor(&cpufreq_gov_userspace);
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}
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MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>, "
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"Russell King <rmk@arm.linux.org.uk>");
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MODULE_DESCRIPTION("CPUfreq policy governor 'userspace'");
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MODULE_LICENSE("GPL");
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#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE
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fs_initcall(cpufreq_gov_userspace_init);
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#else
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module_init(cpufreq_gov_userspace_init);
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#endif
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module_exit(cpufreq_gov_userspace_exit);
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