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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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14a3b6abe9
For implementing a shadow timekeeper and a split calculation/update region we need to store the cycle_last value in the timekeeper and update the value in the clocksource struct only in the update region. Add the extra storage to the timekeeper. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/*
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* You SHOULD NOT be including this unless you're vsyscall
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* handling code or timekeeping internal code!
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*/
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#ifndef _LINUX_TIMEKEEPER_INTERNAL_H
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#define _LINUX_TIMEKEEPER_INTERNAL_H
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#include <linux/clocksource.h>
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#include <linux/jiffies.h>
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#include <linux/time.h>
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/* Structure holding internal timekeeping values. */
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struct timekeeper {
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/* Current clocksource used for timekeeping. */
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struct clocksource *clock;
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/* NTP adjusted clock multiplier */
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u32 mult;
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/* The shift value of the current clocksource. */
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u32 shift;
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/* Number of clock cycles in one NTP interval. */
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cycle_t cycle_interval;
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/* Last cycle value (also stored in clock->cycle_last) */
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cycle_t cycle_last;
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/* Number of clock shifted nano seconds in one NTP interval. */
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u64 xtime_interval;
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/* shifted nano seconds left over when rounding cycle_interval */
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s64 xtime_remainder;
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/* Raw nano seconds accumulated per NTP interval. */
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u32 raw_interval;
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/* Current CLOCK_REALTIME time in seconds */
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u64 xtime_sec;
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/* Clock shifted nano seconds */
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u64 xtime_nsec;
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/* Difference between accumulated time and NTP time in ntp
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* shifted nano seconds. */
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s64 ntp_error;
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/* Shift conversion between clock shifted nano seconds and
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* ntp shifted nano seconds. */
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u32 ntp_error_shift;
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/*
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* wall_to_monotonic is what we need to add to xtime (or xtime corrected
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* for sub jiffie times) to get to monotonic time. Monotonic is pegged
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* at zero at system boot time, so wall_to_monotonic will be negative,
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* however, we will ALWAYS keep the tv_nsec part positive so we can use
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* the usual normalization.
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*
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* wall_to_monotonic is moved after resume from suspend for the
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* monotonic time not to jump. We need to add total_sleep_time to
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* wall_to_monotonic to get the real boot based time offset.
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*
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* - wall_to_monotonic is no longer the boot time, getboottime must be
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* used instead.
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*/
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struct timespec wall_to_monotonic;
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/* Offset clock monotonic -> clock realtime */
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ktime_t offs_real;
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/* time spent in suspend */
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struct timespec total_sleep_time;
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/* Offset clock monotonic -> clock boottime */
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ktime_t offs_boot;
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/* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
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struct timespec raw_time;
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/* The current UTC to TAI offset in seconds */
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s32 tai_offset;
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/* Offset clock monotonic -> clock tai */
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ktime_t offs_tai;
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};
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static inline struct timespec tk_xtime(struct timekeeper *tk)
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{
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struct timespec ts;
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ts.tv_sec = tk->xtime_sec;
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ts.tv_nsec = (long)(tk->xtime_nsec >> tk->shift);
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return ts;
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}
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#ifdef CONFIG_GENERIC_TIME_VSYSCALL
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extern void update_vsyscall(struct timekeeper *tk);
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extern void update_vsyscall_tz(void);
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#elif defined(CONFIG_GENERIC_TIME_VSYSCALL_OLD)
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extern void update_vsyscall_old(struct timespec *ts, struct timespec *wtm,
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struct clocksource *c, u32 mult);
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extern void update_vsyscall_tz(void);
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static inline void update_vsyscall(struct timekeeper *tk)
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{
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struct timespec xt;
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xt = tk_xtime(tk);
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update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult);
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}
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#else
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static inline void update_vsyscall(struct timekeeper *tk)
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{
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}
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static inline void update_vsyscall_tz(void)
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{
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}
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#endif
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#endif /* _LINUX_TIMEKEEPER_INTERNAL_H */
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