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