Release 4.14 arch/s390/kernel/idle.c
// SPDX-License-Identifier: GPL-2.0
/*
* Idle functions for s390.
*
* Copyright IBM Corp. 2014
*
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/kprobes.h>
#include <linux/notifier.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <linux/sched/cputime.h>
#include <asm/nmi.h>
#include <asm/smp.h>
#include "entry.h"
static DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
void enabled_wait(void)
{
struct s390_idle_data *idle = this_cpu_ptr(&s390_idle);
unsigned long long idle_time;
unsigned long psw_mask;
trace_hardirqs_on();
/* Wait for external, I/O or machine check interrupt. */
psw_mask = PSW_KERNEL_BITS | PSW_MASK_WAIT | PSW_MASK_DAT |
PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
clear_cpu_flag(CIF_NOHZ_DELAY);
/* Call the assembler magic in entry.S */
psw_idle(idle, psw_mask);
trace_hardirqs_off();
/* Account time spent with enabled wait psw loaded as idle time. */
write_seqcount_begin(&idle->seqcount);
idle_time = idle->clock_idle_exit - idle->clock_idle_enter;
idle->clock_idle_enter = idle->clock_idle_exit = 0ULL;
idle->idle_time += idle_time;
idle->idle_count++;
account_idle_time(cputime_to_nsecs(idle_time));
write_seqcount_end(&idle->seqcount);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 99 | 84.62% | 1 | 20.00% |
| Frédéric Weisbecker | 13 | 11.11% | 2 | 40.00% |
| Heiko Carstens | 3 | 2.56% | 1 | 20.00% |
| Linus Torvalds | 2 | 1.71% | 1 | 20.00% |
| Total | 117 | 100.00% | 5 | 100.00% |
NOKPROBE_SYMBOL(enabled_wait);
static ssize_t show_idle_count(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id);
unsigned long long idle_count;
unsigned int seq;
do {
seq = read_seqcount_begin(&idle->seqcount);
idle_count = READ_ONCE(idle->idle_count);
if (READ_ONCE(idle->clock_idle_enter))
idle_count++;
} while (read_seqcount_retry(&idle->seqcount, seq));
return sprintf(buf, "%llu\n", idle_count);
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 89 | 88.12% | 1 | 33.33% |
| Frédéric Weisbecker | 10 | 9.90% | 1 | 33.33% |
| Christian Bornträger | 2 | 1.98% | 1 | 33.33% |
| Total | 101 | 100.00% | 3 | 100.00% |
DEVICE_ATTR(idle_count, 0444, show_idle_count, NULL);
static ssize_t show_idle_time(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id);
unsigned long long now, idle_time, idle_enter, idle_exit;
unsigned int seq;
do {
now = get_tod_clock();
seq = read_seqcount_begin(&idle->seqcount);
idle_time = READ_ONCE(idle->idle_time);
idle_enter = READ_ONCE(idle->clock_idle_enter);
idle_exit = READ_ONCE(idle->clock_idle_exit);
} while (read_seqcount_retry(&idle->seqcount, seq));
idle_time += idle_enter ? ((idle_exit ? : now) - idle_enter) : 0;
return sprintf(buf, "%llu\n", idle_time >> 12);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 124 | 90.51% | 1 | 33.33% |
| Frédéric Weisbecker | 10 | 7.30% | 1 | 33.33% |
| Christian Bornträger | 3 | 2.19% | 1 | 33.33% |
| Total | 137 | 100.00% | 3 | 100.00% |
DEVICE_ATTR(idle_time_us, 0444, show_idle_time, NULL);
u64 arch_cpu_idle_time(int cpu)
{
struct s390_idle_data *idle = &per_cpu(s390_idle, cpu);
unsigned long long now, idle_enter, idle_exit;
unsigned int seq;
do {
now = get_tod_clock();
seq = read_seqcount_begin(&idle->seqcount);
idle_enter = READ_ONCE(idle->clock_idle_enter);
idle_exit = READ_ONCE(idle->clock_idle_exit);
} while (read_seqcount_retry(&idle->seqcount, seq));
return cputime_to_nsecs(idle_enter ? ((idle_exit ?: now) - idle_enter) : 0);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 86 | 84.31% | 1 | 25.00% |
| Frédéric Weisbecker | 14 | 13.73% | 2 | 50.00% |
| Christian Bornträger | 2 | 1.96% | 1 | 25.00% |
| Total | 102 | 100.00% | 4 | 100.00% |
void arch_cpu_idle_enter(void)
{
local_mcck_disable();
}
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| Martin Schwidefsky | 10 | 100.00% | 1 | 100.00% |
| Total | 10 | 100.00% | 1 | 100.00% |
void arch_cpu_idle(void)
{
if (!test_cpu_flag(CIF_MCCK_PENDING))
/* Halt the cpu and keep track of cpu time accounting. */
enabled_wait();
local_irq_enable();
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 22 | 100.00% | 1 | 100.00% |
| Total | 22 | 100.00% | 1 | 100.00% |
void arch_cpu_idle_exit(void)
{
local_mcck_enable();
if (test_cpu_flag(CIF_MCCK_PENDING))
s390_handle_mcck();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 20 | 100.00% | 1 | 100.00% |
| Total | 20 | 100.00% | 1 | 100.00% |
void arch_cpu_idle_dead(void)
{
cpu_die();
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 10 | 100.00% | 1 | 100.00% |
| Total | 10 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 521 | 88.76% | 1 | 10.00% |
| Frédéric Weisbecker | 47 | 8.01% | 3 | 30.00% |
| Heiko Carstens | 8 | 1.36% | 2 | 20.00% |
| Christian Bornträger | 7 | 1.19% | 1 | 10.00% |
| Linus Torvalds | 2 | 0.34% | 1 | 10.00% |
| Ingo Molnar | 1 | 0.17% | 1 | 10.00% |
| Greg Kroah-Hartman | 1 | 0.17% | 1 | 10.00% |
| Total | 587 | 100.00% | 10 | 100.00% |
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