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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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In the current timekeeping code there isn't any interface to atomically capture the current relationship between the system counter and system time. ktime_get_snapshot() returns this triple (counter, monotonic raw, realtime) in the system_time_snapshot struct. Cc: Prarit Bhargava <prarit@redhat.com> Cc: Richard Cochran <richardcochran@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: kevin.b.stanton@intel.com Cc: kevin.j.clarke@intel.com Cc: hpa@zytor.com Cc: jeffrey.t.kirsher@intel.com Cc: netdev@vger.kernel.org Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Christopher S. Hall <christopher.s.hall@intel.com> [jstultz: Moved structure definitions around to clean things up, fixed cycles_t/cycle_t confusion.] Signed-off-by: John Stultz <john.stultz@linaro.org>
299 lines
6.3 KiB
C
299 lines
6.3 KiB
C
#ifndef _LINUX_TIMEKEEPING_H
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#define _LINUX_TIMEKEEPING_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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/*
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* Get and set timeofday
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*/
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extern void do_gettimeofday(struct timeval *tv);
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extern int do_settimeofday64(const struct timespec64 *ts);
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extern int do_sys_settimeofday(const struct timespec *tv,
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const struct timezone *tz);
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/*
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* Kernel time accessors
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*/
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unsigned long get_seconds(void);
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struct timespec64 current_kernel_time64(void);
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/* does not take xtime_lock */
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struct timespec __current_kernel_time(void);
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static inline struct timespec current_kernel_time(void)
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{
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struct timespec64 now = current_kernel_time64();
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return timespec64_to_timespec(now);
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}
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/*
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* timespec based interfaces
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*/
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struct timespec64 get_monotonic_coarse64(void);
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extern void getrawmonotonic64(struct timespec64 *ts);
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extern void ktime_get_ts64(struct timespec64 *ts);
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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 int __getnstimeofday64(struct timespec64 *tv);
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extern void getnstimeofday64(struct timespec64 *tv);
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extern void getboottime64(struct timespec64 *ts);
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#if BITS_PER_LONG == 64
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/**
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* Deprecated. Use do_settimeofday64().
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*/
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static inline int do_settimeofday(const struct timespec *ts)
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{
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return do_settimeofday64(ts);
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}
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static inline int __getnstimeofday(struct timespec *ts)
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{
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return __getnstimeofday64(ts);
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}
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static inline void getnstimeofday(struct timespec *ts)
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{
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getnstimeofday64(ts);
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}
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static inline void ktime_get_ts(struct timespec *ts)
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{
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ktime_get_ts64(ts);
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}
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static inline void ktime_get_real_ts(struct timespec *ts)
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{
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getnstimeofday64(ts);
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}
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static inline void getrawmonotonic(struct timespec *ts)
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{
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getrawmonotonic64(ts);
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}
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static inline struct timespec get_monotonic_coarse(void)
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{
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return get_monotonic_coarse64();
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}
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static inline void getboottime(struct timespec *ts)
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{
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return getboottime64(ts);
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}
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#else
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/**
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* Deprecated. Use do_settimeofday64().
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*/
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static inline int do_settimeofday(const struct timespec *ts)
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{
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struct timespec64 ts64;
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ts64 = timespec_to_timespec64(*ts);
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return do_settimeofday64(&ts64);
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}
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static inline int __getnstimeofday(struct timespec *ts)
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{
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struct timespec64 ts64;
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int ret = __getnstimeofday64(&ts64);
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*ts = timespec64_to_timespec(ts64);
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return ret;
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}
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static inline void getnstimeofday(struct timespec *ts)
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{
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struct timespec64 ts64;
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getnstimeofday64(&ts64);
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*ts = timespec64_to_timespec(ts64);
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}
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static inline void ktime_get_ts(struct timespec *ts)
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{
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struct timespec64 ts64;
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ktime_get_ts64(&ts64);
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*ts = timespec64_to_timespec(ts64);
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}
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static inline void ktime_get_real_ts(struct timespec *ts)
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{
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struct timespec64 ts64;
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getnstimeofday64(&ts64);
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*ts = timespec64_to_timespec(ts64);
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}
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static inline void getrawmonotonic(struct timespec *ts)
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{
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struct timespec64 ts64;
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getrawmonotonic64(&ts64);
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*ts = timespec64_to_timespec(ts64);
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}
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static inline struct timespec get_monotonic_coarse(void)
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{
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return timespec64_to_timespec(get_monotonic_coarse64());
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}
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static inline void getboottime(struct timespec *ts)
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{
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struct timespec64 ts64;
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getboottime64(&ts64);
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*ts = timespec64_to_timespec(ts64);
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}
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#endif
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#define ktime_get_real_ts64(ts) getnstimeofday64(ts)
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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_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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/**
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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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/**
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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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/**
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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_boot_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_tai_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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/*
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* Timespec interfaces utilizing the ktime based ones
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*/
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static inline void get_monotonic_boottime(struct timespec *ts)
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{
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*ts = ktime_to_timespec(ktime_get_boottime());
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}
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static inline void get_monotonic_boottime64(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 timekeeping_clocktai(struct timespec *ts)
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{
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*ts = ktime_to_timespec(ktime_get_clocktai());
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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(struct timespec64 *delta);
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/*
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* PPS accessor
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*/
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extern void ktime_get_raw_and_real_ts64(struct timespec64 *ts_raw,
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struct timespec64 *ts_real);
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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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*/
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struct system_time_snapshot {
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cycle_t cycles;
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ktime_t real;
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ktime_t raw;
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};
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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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/*
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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_clock(struct timespec *ts);
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extern void read_persistent_clock64(struct timespec64 *ts);
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extern void read_boot_clock64(struct timespec64 *ts);
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extern int update_persistent_clock(struct timespec now);
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extern int update_persistent_clock64(struct timespec64 now);
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#endif
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