[linux-block.git] / kernel / time / timekeeping_internal.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _TIMEKEEPING_INTERNAL_H
#define _TIMEKEEPING_INTERNAL_H

#include <linux/clocksource.h>
#include <linux/spinlock.h>
#include <linux/time.h>

/*
 * timekeeping debug functions
 */
#ifdef CONFIG_DEBUG_FS

DECLARE_PER_CPU(unsigned long, timekeeping_mg_floor_swaps);

static inline void timekeeping_inc_mg_floor_swaps(void)
{
	this_cpu_inc(timekeeping_mg_floor_swaps);
}

extern void tk_debug_account_sleep_time(const struct timespec64 *t);

#else

#define tk_debug_account_sleep_time(x)

static inline void timekeeping_inc_mg_floor_swaps(void)
{
}

#endif

static inline u64 clocksource_delta(u64 now, u64 last, u64 mask, u64 max_delta)
{
	u64 ret = (now - last) & mask;

	/*
	 * Prevent time going backwards by checking the result against
	 * @max_delta. If greater, return 0.
	 */
	return ret > max_delta ? 0 : ret;
}

/* Semi public for serialization of non timekeeper VDSO updates. */
unsigned long timekeeper_lock_irqsave(void);
void timekeeper_unlock_irqrestore(unsigned long flags);

#endif /* _TIMEKEEPING_INTERNAL_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
5c83545f CC	2	#ifndef _TIMEKEEPING_INTERNAL_H
5c83545f CC	3	#define _TIMEKEEPING_INTERNAL_H
19d0070a	4
3a978377	5	#include <linux/clocksource.h>
19d0070a	6	#include <linux/spinlock.h>
5c83545f CC	7	#include <linux/time.h>
5c83545f CC	8
19d0070a TG	9	/*
	10	* timekeeping debug functions
	11	*/
5c83545f	12	#ifdef CONFIG_DEBUG_FS
96f9a366 JL	13
	14	DECLARE_PER_CPU(unsigned long, timekeeping_mg_floor_swaps);
	15
	16	static inline void timekeeping_inc_mg_floor_swaps(void)
	17	{
	18	this_cpu_inc(timekeeping_mg_floor_swaps);
	19	}
	20
985e6950	21	extern void tk_debug_account_sleep_time(const struct timespec64 *t);
96f9a366	22
5c83545f	23	#else
96f9a366	24
5c83545f	25	#define tk_debug_account_sleep_time(x)
96f9a366 JL	26
	27	static inline void timekeeping_inc_mg_floor_swaps(void)
	28	{
	29	}
	30
5c83545f CC	31	#endif
5c83545f CC	32
76031d95	33	static inline u64 clocksource_delta(u64 now, u64 last, u64 mask, u64 max_delta)
09ec5442	34	{
a5a1d1c2	35	u64 ret = (now - last) & mask;
09ec5442	36
1f45f1f3	37	/*
76031d95 TG	38	* Prevent time going backwards by checking the result against
76031d95 TG	39	* @max_delta. If greater, return 0.
1f45f1f3	40	*/
76031d95	41	return ret > max_delta ? 0 : ret;
09ec5442	42	}
3a978377	43
19d0070a	44	/* Semi public for serialization of non timekeeper VDSO updates. */
dbdcf8c4 TG	45	unsigned long timekeeper_lock_irqsave(void);
dbdcf8c4 TG	46	void timekeeper_unlock_irqrestore(unsigned long flags);
19d0070a	47
5c83545f	48	#endif /* _TIMEKEEPING_INTERNAL_H */