131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/*
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* SPDX-License-Identifier: GPL-2.0
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* Copyright (c) 2023 MCST
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*/
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#ifdef CONFIG_MCST
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/seqlock.h>
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#include <linux/timex.h>
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#include <asm/timer.h>
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#include <asm/uaccess.h>
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#define GHZ 1000000000
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#ifndef DINTR_TIMER_UNITS
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#define DINTR_TIMER_UNITS "unknown"
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#endif
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/* Time of disabled interrupts */
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DEFINE_PER_CPU(unsigned long, dintr_time_max);
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DEFINE_PER_CPU(unsigned long, dintr_time_min);
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/* The different cpu_times for printing */
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cpu_times_t cpu_times[NR_CPUS] = {
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[0 ... NR_CPUS-1] = {
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.curr_time_switch_to = 0,
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.min_time_switch_to = LLONG_MAX,
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.max_time_switch_to = 0
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}
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};
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static DEFINE_MUTEX(dintr_mutex);
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int dintr_timer_state = DINTR_TIMER_WASNT_USE;
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static int cpu_times_show(struct seq_file *m, void *v)
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{
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int my_cpu, cpu;
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my_cpu = raw_smp_processor_id();
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/* Print the time of disabled interrupt state */
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seq_printf(m, "\t The duration of disabled interrupt state (in "
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DINTR_TIMER_UNITS ")\n");
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for_each_online_cpu(cpu) {
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unsigned long min = per_cpu(dintr_time_min, cpu);
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unsigned long max = per_cpu(dintr_time_max, cpu);
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if (min > max)
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seq_printf(m, "cpu=%d: no data\t%c\n", cpu,
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cpu == my_cpu ? '*' : '\0');
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else
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seq_printf(m, "cpu=%d: min=%lu, max=%lu\t%c\n", cpu,
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per_cpu(dintr_time_min, cpu),
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per_cpu(dintr_time_max, cpu),
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cpu == my_cpu ? '*' : '\0');
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}
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/* print times of switch_to */
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seq_printf(m, "\t The cpu times of switch_to (in nsec)\t\n");
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for_each_online_cpu(cpu) {
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u64 min_part = cpu_times[cpu].min_time_switch_to*GHZ;
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u64 max_part = cpu_times[cpu].max_time_switch_to*GHZ;
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do_div(min_part, cpu_freq_hz);
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do_div(max_part, cpu_freq_hz);
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seq_printf(m, "cpu=%d: min=%llu, max=%llu\n", cpu,
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min_part, max_part);
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}
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return 0;
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}
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static ssize_t cpu_times_write(struct file *f, const char __user *b,
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size_t c, loff_t *o)
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{
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char s;
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int cpu;
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if (get_user(s, b) == 0) {
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switch (s) {
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case '1':
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mutex_lock(&dintr_mutex);
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if (dintr_timer_state != DINTR_TIMER_RUNNING)
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dintr_timer_state = DINTR_TIMER_RUNNING;
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mutex_unlock(&dintr_mutex);
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break;
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case '0':
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mutex_lock(&dintr_mutex);
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if (dintr_timer_state == DINTR_TIMER_RUNNING)
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dintr_timer_state = DINTR_TIMER_STOPPED;
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mutex_unlock(&dintr_mutex);
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break;
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default:
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for_each_online_cpu(cpu) {
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per_cpu(dintr_time_min, cpu) = ULONG_MAX;
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per_cpu(dintr_time_max, cpu) = 0;
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cpu_times[cpu].min_time_switch_to = LLONG_MAX;
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cpu_times[cpu].max_time_switch_to = 0;
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}
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}
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}
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return c;
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}
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static int cpu_times_open(struct inode *inode, struct file *file)
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{
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return single_open(file, cpu_times_show, NULL);
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}
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static const struct proc_ops cpu_times_pops = {
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.proc_open = cpu_times_open,
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.proc_read = seq_read,
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.proc_write = cpu_times_write,
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.proc_lseek = seq_lseek,
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.proc_release = single_release,
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};
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static int __init proc_cpu_times_init(void)
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{
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proc_create("cpu_times", 0, NULL, &cpu_times_pops);
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return 0;
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}
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module_init(proc_cpu_times_init);
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#endif
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