Edit File: timekeeper_internal.h
/* * You SHOULD NOT be including this unless you're vsyscall * handling code or timekeeping internal code! */ #ifndef _LINUX_TIMEKEEPER_INTERNAL_H #define _LINUX_TIMEKEEPER_INTERNAL_H #include <linux/clocksource.h> #include <linux/jiffies.h> #include <linux/time.h> /** * struct tk_read_base - base structure for timekeeping readout * @clock: Current clocksource used for timekeeping. * @cycle_last: @clock cycle value at last update * @mult: NTP adjusted multiplier for scaled math conversion * @shift: Shift value for scaled math conversion * @xtime_nsec: Shifted (fractional) nano seconds offset for readout * @base_mono: ktime_t (nanoseconds) base time for readout * * This struct has size 56 byte on 64 bit. Together with a seqcount it * occupies a single 64byte cache line. * * The struct is separate from struct timekeeper as it is also used * for a fast NMI safe accessor to clock monotonic. */ struct tk_read_base { struct clocksource *clock; u64 cycle_last; u32 mult; u32 shift; u64 xtime_nsec; ktime_t base; }; /** * struct timekeeper - Structure holding internal timekeeping values. * @tkr_mono: The readout base structure for CLOCK_MONOTONIC * @tkr_raw: The readout base structure for CLOCK_MONOTONIC_RAW * @xtime_sec: Current CLOCK_REALTIME time in seconds * @wall_to_monotonic: CLOCK_REALTIME to CLOCK_MONOTONIC offset * @offs_real: Offset clock monotonic -> clock realtime * @offs_boot: Offset clock monotonic -> clock boottime * @offs_tai: Offset clock monotonic -> clock tai * @tai_offset: The current UTC to TAI offset in seconds * @raw_time: Monotonic raw base time in timespec64 format * @clock_was_set_seq: The sequence number of clock was set events * @cs_was_changed_seq: The sequence number of clocksource change events * @next_leap_ktime: CLOCK_MONOTONIC time value of a pending leap-second * @cycle_interval: Number of clock cycles in one NTP interval * @xtime_interval: Number of clock shifted nano seconds in one NTP * interval. * @xtime_remainder: Shifted nano seconds left over when rounding * @cycle_interval * @raw_interval: Raw nano seconds accumulated per NTP interval. * @ntp_error: Difference between accumulated time and NTP time in ntp * shifted nano seconds. * @ntp_error_shift: Shift conversion between clock shifted nano seconds and * ntp shifted nano seconds. * @total_sleep_time: Time spent in suspend. * * Note: For timespec(64) based interfaces wall_to_monotonic is what * we need to add to xtime (or xtime corrected for sub jiffie times) * to get to monotonic time. Monotonic is pegged at zero at system * boot time, so wall_to_monotonic will be negative, however, we will * ALWAYS keep the tv_nsec part positive so we can use the usual * normalization. * * wall_to_monotonic is moved after resume from suspend for the * monotonic time not to jump. We need to add total_sleep_time to * wall_to_monotonic to get the real boot based time offset. * * wall_to_monotonic is no longer the boot time, getboottime must be * used instead. */ struct timekeeper { struct tk_read_base tkr_mono; struct tk_read_base tkr_raw; u64 xtime_sec; struct timespec64 wall_to_monotonic; ktime_t offs_real; ktime_t offs_boot; ktime_t offs_tai; s32 tai_offset; struct timespec64 raw_time; /* The following members are for timekeeping internal use */ unsigned int clock_was_set_seq; u8 cs_was_changed_seq; ktime_t next_leap_ktime; u64 cycle_interval; u64 xtime_interval; s64 xtime_remainder; u32 raw_interval; s64 ntp_error; u32 ntp_error_shift; /* The ntp_tick_length() value currently being used. * This cached copy ensures we consistently apply the tick * length for an entire tick, as ntp_tick_length may change * mid-tick, and we don't want to apply that new value to * the tick in progress. */ u64 ntp_tick; u32 ntp_err_mult; struct timespec64 total_sleep_time; }; static inline struct timespec64 tk_xtime(struct timekeeper *tk) { struct timespec64 ts; ts.tv_sec = tk->xtime_sec; ts.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift); return ts; } #ifdef CONFIG_GENERIC_TIME_VSYSCALL extern void update_vsyscall(struct timekeeper *tk); extern void update_vsyscall_tz(void); #elif defined(CONFIG_GENERIC_TIME_VSYSCALL_OLD) extern void update_vsyscall_old(struct timespec *ts, struct timespec *wtm, struct clocksource *c, u32 mult); extern void update_vsyscall_tz(void); static inline void update_vsyscall(struct timekeeper *tk) { struct timespec xt; xt = tk_xtime(tk); update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->tkr_mono.clock, tk->tkr_mono.mult); } #else static inline void update_vsyscall(struct timekeeper *tk) { } static inline void update_vsyscall_tz(void) { } #endif #endif /* _LINUX_TIMEKEEPER_INTERNAL_H */