Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Alexey Dobriyan | a9caa3d | 2009-02-20 17:07:22 +0300 | [diff] [blame] | 2 | #include <linux/fs.h> |
Alexey Dobriyan | 9617760 | 2008-10-03 02:38:18 +0400 | [diff] [blame] | 3 | #include <linux/init.h> |
| 4 | #include <linux/proc_fs.h> |
| 5 | #include <linux/sched.h> |
Alexey Dobriyan | a9caa3d | 2009-02-20 17:07:22 +0300 | [diff] [blame] | 6 | #include <linux/seq_file.h> |
Alexey Dobriyan | 9617760 | 2008-10-03 02:38:18 +0400 | [diff] [blame] | 7 | #include <linux/time.h> |
Dmitry Safonov | 0efc8bb | 2019-11-12 01:27:07 +0000 | [diff] [blame] | 8 | #include <linux/time_namespace.h> |
Michael Abbott | 96830a5 | 2009-09-24 10:15:19 +0200 | [diff] [blame] | 9 | #include <linux/kernel_stat.h> |
Alexey Dobriyan | 9617760 | 2008-10-03 02:38:18 +0400 | [diff] [blame] | 10 | |
Alexey Dobriyan | a9caa3d | 2009-02-20 17:07:22 +0300 | [diff] [blame] | 11 | static int uptime_proc_show(struct seq_file *m, void *v) |
Alexey Dobriyan | 9617760 | 2008-10-03 02:38:18 +0400 | [diff] [blame] | 12 | { |
Arnd Bergmann | bdf228a | 2018-08-21 21:54:13 -0700 | [diff] [blame] | 13 | struct timespec64 uptime; |
Deepa Dinamani | 95582b0 | 2018-05-08 19:36:02 -0700 | [diff] [blame] | 14 | struct timespec64 idle; |
Martin Schwidefsky | c3e0ef9 | 2011-12-15 14:56:10 +0100 | [diff] [blame] | 15 | u64 nsec; |
| 16 | u32 rem; |
Michael Abbott | 96830a5 | 2009-09-24 10:15:19 +0200 | [diff] [blame] | 17 | int i; |
Michael Abbott | 96830a5 | 2009-09-24 10:15:19 +0200 | [diff] [blame] | 18 | |
Frederic Weisbecker | 7fb1327 | 2017-01-31 04:09:19 +0100 | [diff] [blame] | 19 | nsec = 0; |
Michael Abbott | 96830a5 | 2009-09-24 10:15:19 +0200 | [diff] [blame] | 20 | for_each_possible_cpu(i) |
Frederic Weisbecker | 7fb1327 | 2017-01-31 04:09:19 +0100 | [diff] [blame] | 21 | nsec += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE]; |
Alexey Dobriyan | 9617760 | 2008-10-03 02:38:18 +0400 | [diff] [blame] | 22 | |
Arnd Bergmann | bdf228a | 2018-08-21 21:54:13 -0700 | [diff] [blame] | 23 | ktime_get_boottime_ts64(&uptime); |
Dmitry Safonov | 0efc8bb | 2019-11-12 01:27:07 +0000 | [diff] [blame] | 24 | timens_add_boottime(&uptime); |
| 25 | |
Martin Schwidefsky | c3e0ef9 | 2011-12-15 14:56:10 +0100 | [diff] [blame] | 26 | idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem); |
| 27 | idle.tv_nsec = rem; |
Alexey Dobriyan | a9caa3d | 2009-02-20 17:07:22 +0300 | [diff] [blame] | 28 | seq_printf(m, "%lu.%02lu %lu.%02lu\n", |
Alexey Dobriyan | 9617760 | 2008-10-03 02:38:18 +0400 | [diff] [blame] | 29 | (unsigned long) uptime.tv_sec, |
| 30 | (uptime.tv_nsec / (NSEC_PER_SEC / 100)), |
| 31 | (unsigned long) idle.tv_sec, |
| 32 | (idle.tv_nsec / (NSEC_PER_SEC / 100))); |
Alexey Dobriyan | a9caa3d | 2009-02-20 17:07:22 +0300 | [diff] [blame] | 33 | return 0; |
Alexey Dobriyan | 9617760 | 2008-10-03 02:38:18 +0400 | [diff] [blame] | 34 | } |
| 35 | |
Alexey Dobriyan | 9617760 | 2008-10-03 02:38:18 +0400 | [diff] [blame] | 36 | static int __init proc_uptime_init(void) |
| 37 | { |
Christoph Hellwig | 3f3942a | 2018-05-15 15:57:23 +0200 | [diff] [blame] | 38 | proc_create_single("uptime", 0, NULL, uptime_proc_show); |
Alexey Dobriyan | 9617760 | 2008-10-03 02:38:18 +0400 | [diff] [blame] | 39 | return 0; |
| 40 | } |
Paul Gortmaker | abaf378 | 2014-01-23 15:55:45 -0800 | [diff] [blame] | 41 | fs_initcall(proc_uptime_init); |