Commit 22c62b9a authored by Anna-Maria Behnsen's avatar Anna-Maria Behnsen Committed by Thomas Gleixner
Browse files

timekeeping: Introduce auxiliary timekeepers 



Provide timekeepers for auxiliary clocks and initialize them during
boot.

Signed-off-by: default avatarAnna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarJohn Stultz <jstultz@google.com>
Link: https://lore.kernel.org/all/20250519083026.350061049@linutronix.de
parent 61680246

kernel/time/timekeeping.c

+20 −2
Original line number Diff line number Diff line
@@ -53,7 +53,11 @@ struct tk_data { 
	raw_spinlock_t		lock;

} ____cacheline_aligned;



static struct tk_data tk_core;

static struct tk_data timekeeper_data[TIMEKEEPERS_MAX];



/* The core timekeeper */

#define tk_core		(timekeeper_data[TIMEKEEPER_CORE])





/* flag for if timekeeping is suspended */

int __read_mostly timekeeping_suspended;
@@ -113,6 +117,12 @@ static struct tk_fast tk_fast_raw ____cacheline_aligned = { 
	.base[1] = FAST_TK_INIT,

};



#ifdef CONFIG_POSIX_AUX_CLOCKS

static __init void tk_aux_setup(void);

#else

static inline void tk_aux_setup(void) { }

#endif



unsigned long timekeeper_lock_irqsave(void)

{

	unsigned long flags;
@@ -1589,7 +1599,6 @@ void ktime_get_raw_ts64(struct timespec64 *ts) 
}

EXPORT_SYMBOL(ktime_get_raw_ts64);





/**

 * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres

 */
@@ -1701,6 +1710,7 @@ void __init timekeeping_init(void) 
	struct clocksource *clock;



	tkd_basic_setup(&tk_core, TIMEKEEPER_CORE, true);

	tk_aux_setup();



	read_persistent_wall_and_boot_offset(&wall_time, &boot_offset);

	if (timespec64_valid_settod(&wall_time) &&
@@ -2630,3 +2640,11 @@ void hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_ts) 
}

EXPORT_SYMBOL(hardpps);

#endif /* CONFIG_NTP_PPS */



#ifdef CONFIG_POSIX_AUX_CLOCKS

static __init void tk_aux_setup(void)

{

	for (int i = TIMEKEEPER_AUX_FIRST; i <= TIMEKEEPER_AUX_LAST; i++)

		tkd_basic_setup(&timekeeper_data[i], i, false);

}

#endif /* CONFIG_POSIX_AUX_CLOCKS */