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309 lines
7.5 KiB
309 lines
7.5 KiB
/* 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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/* 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 wit |
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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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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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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 - Returns 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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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 - 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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*/ |
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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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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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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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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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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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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_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_timestanps - 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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* @raw: Monotonic raw system time |
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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 raw; |
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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 pointer to the |
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* corresponding clocksource |
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* @cycles: System counter value |
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* @cs: Clocksource corresponding to system counter value. Used by |
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* timekeeping code to verify comparibility of two cycle values |
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*/ |
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struct system_counterval_t { |
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u64 cycles; |
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struct clocksource *cs; |
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}; |
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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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