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timekeeping: Introduce auxiliary timekeepers

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Provide timekeepers for auxiliary clocks and initialize them during
boot.

Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <jstultz@google.com>
Link: https://lore.kernel.org/all/20250519083026.350061049@linutronix.de
This commit is contained in:
Anna-Maria Behnsen
2025-05-19 10:33:28 +02:00
committed by Thomas Gleixner
parent 6168024604
commit 22c62b9a84
1 changed files with 20 additions and 2 deletions
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22
kernel/time/timekeeping.c
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@@ -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 */