63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* debugfs file to track time spent in suspend
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*
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* Copyright (c) 2011, Google, Inc.
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*/
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#include <linux/debugfs.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/seq_file.h>
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#include <linux/suspend.h>
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#include <linux/time.h>
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#include "timekeeping_internal.h"
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#define NUM_BINS 32
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static unsigned int sleep_time_bin[NUM_BINS] = {0};
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static int tk_debug_sleep_time_show(struct seq_file *s, void *data)
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{
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unsigned int bin;
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seq_puts(s, " time (secs) count\n");
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seq_puts(s, "------------------------------\n");
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for (bin = 0; bin < 32; bin++) {
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if (sleep_time_bin[bin] == 0)
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continue;
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seq_printf(s, "%10u - %-10u %4u\n",
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bin ? 1 << (bin - 1) : 0, 1 << bin,
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sleep_time_bin[bin]);
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}
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(tk_debug_sleep_time);
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static int __init tk_debug_sleep_time_init(void)
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{
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struct dentry *d;
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d = debugfs_create_file("sleep_time", 0444, NULL, NULL,
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&tk_debug_sleep_time_fops);
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if (!d) {
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pr_err("Failed to create sleep_time debug file\n");
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return -ENOMEM;
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}
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return 0;
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}
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late_initcall(tk_debug_sleep_time_init);
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void tk_debug_account_sleep_time(const struct timespec64 *t)
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{
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/* Cap bin index so we don't overflow the array */
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int bin = min(fls(t->tv_sec), NUM_BINS-1);
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sleep_time_bin[bin]++;
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pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n",
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(s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC);
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}
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