| 1 | // SPDX-License-Identifier: GPL-2.0+ |
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| 2 | /* |
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| 3 | * debugfs file to track time spent in suspend |
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| 4 | * |
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| 5 | * Copyright (c) 2011, Google, Inc. |
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| 6 | */ |
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| 7 | |
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| 8 | #include <linux/debugfs.h> |
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| 9 | #include <linux/err.h> |
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| 10 | #include <linux/init.h> |
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| 11 | #include <linux/kernel.h> |
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| 12 | #include <linux/seq_file.h> |
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| 13 | #include <linux/suspend.h> |
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| 14 | #include <linux/time.h> |
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| 15 | |
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| 16 | #include "timekeeping_internal.h" |
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| 17 | |
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| 18 | #define NUM_BINS 32 |
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| 19 | |
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| 20 | /* Incremented every time mg_floor is updated */ |
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| 21 | DEFINE_PER_CPU(unsigned long, timekeeping_mg_floor_swaps); |
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| 22 | |
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| 23 | static unsigned int sleep_time_bin[NUM_BINS] = {0}; |
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| 24 | |
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| 25 | static int tk_debug_sleep_time_show(struct seq_file *s, void *data) |
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| 26 | { |
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| 27 | unsigned int bin; |
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| 28 | seq_puts(m: s, s: " time (secs) count\n" ); |
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| 29 | seq_puts(m: s, s: "------------------------------\n" ); |
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| 30 | for (bin = 0; bin < 32; bin++) { |
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| 31 | if (sleep_time_bin[bin] == 0) |
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| 32 | continue; |
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| 33 | seq_printf(m: s, fmt: "%10u - %-10u %4u\n" , |
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| 34 | bin ? 1 << (bin - 1) : 0, 1 << bin, |
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| 35 | sleep_time_bin[bin]); |
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| 36 | } |
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| 37 | return 0; |
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| 38 | } |
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| 39 | DEFINE_SHOW_ATTRIBUTE(tk_debug_sleep_time); |
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| 40 | |
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| 41 | static int __init tk_debug_sleep_time_init(void) |
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| 42 | { |
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| 43 | debugfs_create_file("sleep_time" , 0444, NULL, NULL, |
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| 44 | &tk_debug_sleep_time_fops); |
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| 45 | return 0; |
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| 46 | } |
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| 47 | late_initcall(tk_debug_sleep_time_init); |
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| 48 | |
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| 49 | void tk_debug_account_sleep_time(const struct timespec64 *t) |
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| 50 | { |
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| 51 | /* Cap bin index so we don't overflow the array */ |
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| 52 | int bin = min(fls(t->tv_sec), NUM_BINS-1); |
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| 53 | |
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| 54 | sleep_time_bin[bin]++; |
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| 55 | pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n" , |
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| 56 | (s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC); |
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| 57 | } |
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| 58 | |
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| 59 | unsigned long timekeeping_get_mg_floor_swaps(void) |
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| 60 | { |
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| 61 | unsigned long sum = 0; |
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| 62 | int cpu; |
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| 63 | |
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| 64 | for_each_possible_cpu(cpu) |
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| 65 | sum += data_race(per_cpu(timekeeping_mg_floor_swaps, cpu)); |
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| 66 | |
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| 67 | return sum; |
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| 68 | } |
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| 69 | |
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