diff options
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/ntp.c | 42 | ||||
| -rw-r--r-- | kernel/time/ntp_internal.h | 1 | ||||
| -rw-r--r-- | kernel/time/timekeeping.c | 23 |
3 files changed, 58 insertions, 8 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index 7aa2161..033743e 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -77,6 +77,9 @@ static long time_adjust; /* constant (boot-param configurable) NTP tick adjustment (upscaled) */ static s64 ntp_tick_adj; +/* second value of the next pending leapsecond, or TIME64_MAX if no leap */ +static time64_t ntp_next_leap_sec = TIME64_MAX; + #ifdef CONFIG_NTP_PPS /* @@ -350,6 +353,7 @@ void ntp_clear(void) tick_length = tick_length_base; time_offset = 0; + ntp_next_leap_sec = TIME64_MAX; /* Clear PPS state variables */ pps_clear(); } @@ -360,6 +364,21 @@ u64 ntp_tick_length(void) return tick_length; } +/** + * ntp_get_next_leap - Returns the next leapsecond in CLOCK_REALTIME ktime_t + * + * Provides the time of the next leapsecond against CLOCK_REALTIME in + * a ktime_t format. Returns KTIME_MAX if no leapsecond is pending. + */ +ktime_t ntp_get_next_leap(void) +{ + ktime_t ret; + + if ((time_state == TIME_INS) && (time_status & STA_INS)) + return ktime_set(ntp_next_leap_sec, 0); + ret.tv64 = KTIME_MAX; + return ret; +} /* * this routine handles the overflow of the microsecond field @@ -383,15 +402,21 @@ int second_overflow(unsigned long secs) */ switch (time_state) { case TIME_OK: - if (time_status & STA_INS) + if (time_status & STA_INS) { time_state = TIME_INS; - else if (time_status & STA_DEL) + ntp_next_leap_sec = secs + SECS_PER_DAY - + (secs % SECS_PER_DAY); + } else if (time_status & STA_DEL) { time_state = TIME_DEL; + ntp_next_leap_sec = secs + SECS_PER_DAY - + ((secs+1) % SECS_PER_DAY); + } break; case TIME_INS: - if (!(time_status & STA_INS)) + if (!(time_status & STA_INS)) { + ntp_next_leap_sec = TIME64_MAX; time_state = TIME_OK; - else if (secs % SECS_PER_DAY == 0) { + } else if (secs % SECS_PER_DAY == 0) { leap = -1; time_state = TIME_OOP; printk(KERN_NOTICE @@ -399,19 +424,21 @@ int second_overflow(unsigned long secs) } break; case TIME_DEL: - if (!(time_status & STA_DEL)) + if (!(time_status & STA_DEL)) { + ntp_next_leap_sec = TIME64_MAX; time_state = TIME_OK; - else if ((secs + 1) % SECS_PER_DAY == 0) { + } else if ((secs + 1) % SECS_PER_DAY == 0) { leap = 1; + ntp_next_leap_sec = TIME64_MAX; time_state = TIME_WAIT; printk(KERN_NOTICE "Clock: deleting leap second 23:59:59 UTC\n"); } break; case TIME_OOP: + ntp_next_leap_sec = TIME64_MAX; time_state = TIME_WAIT; break; - case TIME_WAIT: if (!(time_status & (STA_INS | STA_DEL))) time_state = TIME_OK; @@ -548,6 +575,7 @@ static inline void process_adj_status(struct timex *txc, struct timespec64 *ts) if ((time_status & STA_PLL) && !(txc->status & STA_PLL)) { time_state = TIME_OK; time_status = STA_UNSYNC; + ntp_next_leap_sec = TIME64_MAX; /* restart PPS frequency calibration */ pps_reset_freq_interval(); } diff --git a/kernel/time/ntp_internal.h b/kernel/time/ntp_internal.h index bbd102a..6543050 100644 --- a/kernel/time/ntp_internal.h +++ b/kernel/time/ntp_internal.h @@ -5,6 +5,7 @@ extern void ntp_init(void); extern void ntp_clear(void); /* Returns how long ticks are at present, in ns / 2^NTP_SCALE_SHIFT. */ extern u64 ntp_tick_length(void); +extern ktime_t ntp_get_next_leap(void); extern int second_overflow(unsigned long secs); extern int ntp_validate_timex(struct timex *); extern int __do_adjtimex(struct timex *, struct timespec64 *, s32 *); diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index 849b932..5d67ffb 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -540,6 +540,17 @@ int pvclock_gtod_unregister_notifier(struct notifier_block *nb) EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier); /* + * tk_update_leap_state - helper to update the next_leap_ktime + */ +static inline void tk_update_leap_state(struct timekeeper *tk) +{ + tk->next_leap_ktime = ntp_get_next_leap(); + if (tk->next_leap_ktime.tv64 != KTIME_MAX) + /* Convert to monotonic time */ + tk->next_leap_ktime = ktime_sub(tk->next_leap_ktime, tk->offs_real); +} + +/* * Update the ktime_t based scalar nsec members of the timekeeper */ static inline void tk_update_ktime_data(struct timekeeper *tk) @@ -580,6 +591,7 @@ static void timekeeping_update(struct timekeeper *tk, unsigned int action) ntp_clear(); } + tk_update_leap_state(tk); tk_update_ktime_data(tk); update_vsyscall(tk); @@ -1956,15 +1968,22 @@ ktime_t ktime_get_update_offsets_now(unsigned int *cwsseq, ktime_t *offs_real, base = tk->tkr_mono.base; nsecs = timekeeping_get_ns(&tk->tkr_mono); + base = ktime_add_ns(base, nsecs); + if (*cwsseq != tk->clock_was_set_seq) { *cwsseq = tk->clock_was_set_seq; *offs_real = tk->offs_real; *offs_boot = tk->offs_boot; *offs_tai = tk->offs_tai; } + + /* Handle leapsecond insertion adjustments */ + if (unlikely(base.tv64 >= tk->next_leap_ktime.tv64)) + *offs_real = ktime_sub(tk->offs_real, ktime_set(1, 0)); + } while (read_seqcount_retry(&tk_core.seq, seq)); - return ktime_add_ns(base, nsecs); + return base; } /** @@ -2006,6 +2025,8 @@ int do_adjtimex(struct timex *txc) __timekeeping_set_tai_offset(tk, tai); timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); } + tk_update_leap_state(tk); + write_seqcount_end(&tk_core.seq); raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
