forked from mirrors/linux
363 lines
9.2 KiB
C
363 lines
9.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_TIMEKEEPING_H
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#define _LINUX_TIMEKEEPING_H
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#include <linux/errno.h>
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#include <linux/clocksource_ids.h>
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#include <linux/ktime.h>
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/* Included from linux/ktime.h */
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void timekeeping_init(void);
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extern int timekeeping_suspended;
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/* Architecture timer tick functions: */
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extern void legacy_timer_tick(unsigned long ticks);
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/*
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* Get and set timeofday
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*/
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extern int do_settimeofday64(const struct timespec64 *ts);
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extern int do_sys_settimeofday64(const struct timespec64 *tv,
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const struct timezone *tz);
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/*
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* ktime_get() family - read the current time in a multitude of ways.
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*
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* The default time reference is CLOCK_MONOTONIC, starting at
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* boot time but not counting the time spent in suspend.
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* For other references, use the functions with "real", "clocktai",
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* "boottime" and "raw" suffixes.
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*
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* To get the time in a different format, use the ones with
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* "ns", "ts64" and "seconds" suffix.
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*
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* See Documentation/core-api/timekeeping.rst for more details.
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*/
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/*
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* timespec64 based interfaces
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*/
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extern void ktime_get_raw_ts64(struct timespec64 *ts);
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extern void ktime_get_ts64(struct timespec64 *ts);
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extern void ktime_get_real_ts64(struct timespec64 *tv);
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extern void ktime_get_coarse_ts64(struct timespec64 *ts);
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extern void ktime_get_coarse_real_ts64(struct timespec64 *ts);
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/* Multigrain timestamp interfaces */
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extern void ktime_get_coarse_real_ts64_mg(struct timespec64 *ts);
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extern void ktime_get_real_ts64_mg(struct timespec64 *ts);
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extern unsigned long timekeeping_get_mg_floor_swaps(void);
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void getboottime64(struct timespec64 *ts);
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/*
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* time64_t base interfaces
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*/
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extern time64_t ktime_get_seconds(void);
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extern time64_t __ktime_get_real_seconds(void);
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extern time64_t ktime_get_real_seconds(void);
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/*
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* ktime_t based interfaces
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*/
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enum tk_offsets {
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TK_OFFS_REAL,
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TK_OFFS_BOOT,
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TK_OFFS_TAI,
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TK_OFFS_MAX,
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};
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extern ktime_t ktime_get(void);
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extern ktime_t ktime_get_with_offset(enum tk_offsets offs);
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extern ktime_t ktime_get_coarse_with_offset(enum tk_offsets offs);
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extern ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs);
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extern ktime_t ktime_get_raw(void);
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extern u32 ktime_get_resolution_ns(void);
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/**
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* ktime_get_real - get the real (wall-) time in ktime_t format
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*
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* Returns: real (wall) time in ktime_t format
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*/
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static inline ktime_t ktime_get_real(void)
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{
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return ktime_get_with_offset(TK_OFFS_REAL);
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}
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static inline ktime_t ktime_get_coarse_real(void)
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{
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return ktime_get_coarse_with_offset(TK_OFFS_REAL);
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}
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/**
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* ktime_get_boottime - Get monotonic time since boot in ktime_t format
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*
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* This is similar to CLOCK_MONTONIC/ktime_get, but also includes the
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* time spent in suspend.
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*
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* Returns: monotonic time since boot in ktime_t format
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*/
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static inline ktime_t ktime_get_boottime(void)
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{
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return ktime_get_with_offset(TK_OFFS_BOOT);
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}
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static inline ktime_t ktime_get_coarse_boottime(void)
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{
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return ktime_get_coarse_with_offset(TK_OFFS_BOOT);
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}
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/**
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* ktime_get_clocktai - Get the TAI time of day in ktime_t format
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*
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* Returns: the TAI time of day in ktime_t format
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*/
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static inline ktime_t ktime_get_clocktai(void)
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{
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return ktime_get_with_offset(TK_OFFS_TAI);
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}
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static inline ktime_t ktime_get_coarse_clocktai(void)
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{
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return ktime_get_coarse_with_offset(TK_OFFS_TAI);
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}
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static inline ktime_t ktime_get_coarse(void)
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{
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struct timespec64 ts;
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ktime_get_coarse_ts64(&ts);
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return timespec64_to_ktime(ts);
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}
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static inline u64 ktime_get_coarse_ns(void)
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{
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return ktime_to_ns(ktime_get_coarse());
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}
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static inline u64 ktime_get_coarse_real_ns(void)
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{
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return ktime_to_ns(ktime_get_coarse_real());
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}
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static inline u64 ktime_get_coarse_boottime_ns(void)
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{
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return ktime_to_ns(ktime_get_coarse_boottime());
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}
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static inline u64 ktime_get_coarse_clocktai_ns(void)
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{
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return ktime_to_ns(ktime_get_coarse_clocktai());
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}
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/**
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* ktime_mono_to_real - Convert monotonic time to clock realtime
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* @mono: monotonic time to convert
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*
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* Returns: time converted to realtime clock
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*/
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static inline ktime_t ktime_mono_to_real(ktime_t mono)
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{
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return ktime_mono_to_any(mono, TK_OFFS_REAL);
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}
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/**
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* ktime_get_ns - Get the current time in nanoseconds
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*
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* Returns: current time converted to nanoseconds
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*/
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static inline u64 ktime_get_ns(void)
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{
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return ktime_to_ns(ktime_get());
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}
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/**
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* ktime_get_real_ns - Get the current real/wall time in nanoseconds
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*
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* Returns: current real time converted to nanoseconds
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*/
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static inline u64 ktime_get_real_ns(void)
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{
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return ktime_to_ns(ktime_get_real());
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}
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/**
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* ktime_get_boottime_ns - Get the monotonic time since boot in nanoseconds
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*
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* Returns: current boottime converted to nanoseconds
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*/
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static inline u64 ktime_get_boottime_ns(void)
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{
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return ktime_to_ns(ktime_get_boottime());
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}
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/**
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* ktime_get_clocktai_ns - Get the current TAI time of day in nanoseconds
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*
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* Returns: current TAI time converted to nanoseconds
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*/
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static inline u64 ktime_get_clocktai_ns(void)
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{
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return ktime_to_ns(ktime_get_clocktai());
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}
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/**
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* ktime_get_raw_ns - Get the raw monotonic time in nanoseconds
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*
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* Returns: current raw monotonic time converted to nanoseconds
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*/
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static inline u64 ktime_get_raw_ns(void)
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{
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return ktime_to_ns(ktime_get_raw());
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}
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extern u64 ktime_get_mono_fast_ns(void);
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extern u64 ktime_get_raw_fast_ns(void);
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extern u64 ktime_get_boot_fast_ns(void);
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extern u64 ktime_get_tai_fast_ns(void);
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extern u64 ktime_get_real_fast_ns(void);
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/*
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* timespec64/time64_t interfaces utilizing the ktime based ones
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* for API completeness, these could be implemented more efficiently
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* if needed.
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*/
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static inline void ktime_get_boottime_ts64(struct timespec64 *ts)
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{
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*ts = ktime_to_timespec64(ktime_get_boottime());
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}
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static inline void ktime_get_coarse_boottime_ts64(struct timespec64 *ts)
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{
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*ts = ktime_to_timespec64(ktime_get_coarse_boottime());
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}
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static inline time64_t ktime_get_boottime_seconds(void)
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{
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return ktime_divns(ktime_get_coarse_boottime(), NSEC_PER_SEC);
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}
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static inline void ktime_get_clocktai_ts64(struct timespec64 *ts)
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{
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*ts = ktime_to_timespec64(ktime_get_clocktai());
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}
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static inline void ktime_get_coarse_clocktai_ts64(struct timespec64 *ts)
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{
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*ts = ktime_to_timespec64(ktime_get_coarse_clocktai());
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}
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static inline time64_t ktime_get_clocktai_seconds(void)
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{
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return ktime_divns(ktime_get_coarse_clocktai(), NSEC_PER_SEC);
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}
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/*
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* RTC specific
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*/
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extern bool timekeeping_rtc_skipsuspend(void);
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extern bool timekeeping_rtc_skipresume(void);
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extern void timekeeping_inject_sleeptime64(const struct timespec64 *delta);
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/**
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* struct ktime_timestamps - Simultaneous mono/boot/real timestamps
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* @mono: Monotonic timestamp
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* @boot: Boottime timestamp
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* @real: Realtime timestamp
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*/
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struct ktime_timestamps {
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u64 mono;
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u64 boot;
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u64 real;
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};
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/**
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* struct system_time_snapshot - simultaneous raw/real time capture with
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* counter value
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* @cycles: Clocksource counter value to produce the system times
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* @real: Realtime system time
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* @boot: Boot time
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* @raw: Monotonic raw system time
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* @cs_id: Clocksource ID
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* @clock_was_set_seq: The sequence number of clock-was-set events
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* @cs_was_changed_seq: The sequence number of clocksource change events
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*/
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struct system_time_snapshot {
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u64 cycles;
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ktime_t real;
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ktime_t boot;
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ktime_t raw;
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enum clocksource_ids cs_id;
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unsigned int clock_was_set_seq;
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u8 cs_was_changed_seq;
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};
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/**
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* struct system_device_crosststamp - system/device cross-timestamp
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* (synchronized capture)
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* @device: Device time
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* @sys_realtime: Realtime simultaneous with device time
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* @sys_monoraw: Monotonic raw simultaneous with device time
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*/
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struct system_device_crosststamp {
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ktime_t device;
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ktime_t sys_realtime;
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ktime_t sys_monoraw;
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};
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/**
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* struct system_counterval_t - system counter value with the ID of the
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* corresponding clocksource
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* @cycles: System counter value
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* @cs_id: Clocksource ID corresponding to system counter value. Used by
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* timekeeping code to verify comparability of two cycle values.
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* The default ID, CSID_GENERIC, does not identify a specific
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* clocksource.
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* @use_nsecs: @cycles is in nanoseconds.
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*/
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struct system_counterval_t {
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u64 cycles;
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enum clocksource_ids cs_id;
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bool use_nsecs;
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};
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extern bool ktime_real_to_base_clock(ktime_t treal,
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enum clocksource_ids base_id, u64 *cycles);
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extern bool timekeeping_clocksource_has_base(enum clocksource_ids id);
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/*
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* Get cross timestamp between system clock and device clock
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*/
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extern int get_device_system_crosststamp(
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int (*get_time_fn)(ktime_t *device_time,
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struct system_counterval_t *system_counterval,
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void *ctx),
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void *ctx,
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struct system_time_snapshot *history,
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struct system_device_crosststamp *xtstamp);
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/*
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* Simultaneously snapshot realtime and monotonic raw clocks
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*/
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extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot);
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/* NMI safe mono/boot/realtime timestamps */
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extern void ktime_get_fast_timestamps(struct ktime_timestamps *snap);
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/*
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* Persistent clock related interfaces
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*/
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extern int persistent_clock_is_local;
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extern void read_persistent_clock64(struct timespec64 *ts);
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void read_persistent_wall_and_boot_offset(struct timespec64 *wall_clock,
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struct timespec64 *boot_offset);
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#ifdef CONFIG_GENERIC_CMOS_UPDATE
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extern int update_persistent_clock64(struct timespec64 now);
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#endif
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#endif
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