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Message-Id: <1379188081-15613-5-git-send-email-mathieu.desnoyers@efficios.com>
Date: Sat, 14 Sep 2013 12:47:58 -0700
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: John Stultz <john.stultz@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
linux-kernel@...r.kernel.org
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [PATCH 4/7] Pass struct timekeeper_ntp as parameter from timekeeper to ntp
This is in preparation for the latch synchronization scheme.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: John Stultz <john.stultz@...aro.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
---
kernel/time/ntp.c | 472 ++++++++++++++++++++++----------------------
kernel/time/ntp_internal.h | 16 +-
kernel/time/timekeeping.c | 17 +-
3 files changed, 260 insertions(+), 245 deletions(-)
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index d61e700..2a1b4ef 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -39,108 +39,108 @@
/* PPS kernel consumer compensates the whole phase error immediately.
* Otherwise, reduce the offset by a fixed factor times the time constant.
*/
-static inline s64 ntp_offset_chunk(s64 offset)
+static inline s64 ntp_offset_chunk(struct timekeeper_ntp *ntp, s64 offset)
{
- if (timekeeper.ntp.time_status & STA_PPSTIME
- && timekeeper.ntp.time_status & STA_PPSSIGNAL)
+ if (ntp->time_status & STA_PPSTIME
+ && ntp->time_status & STA_PPSSIGNAL)
return offset;
else
- return shift_right(offset, SHIFT_PLL + timekeeper.ntp.time_constant);
+ return shift_right(offset, SHIFT_PLL + ntp->time_constant);
}
-static inline void pps_reset_freq_interval(void)
+static inline void pps_reset_freq_interval(struct timekeeper_ntp *ntp)
{
/* the PPS calibration interval may end
surprisingly early */
- timekeeper.ntp.pps.shift = PPS_INTMIN;
- timekeeper.ntp.pps.intcnt = 0;
+ ntp->pps.shift = PPS_INTMIN;
+ ntp->pps.intcnt = 0;
}
/**
* pps_clear - Clears the PPS state variables
*/
-static inline void pps_clear(void)
+static inline void pps_clear(struct timekeeper_ntp *ntp)
{
- pps_reset_freq_interval();
- timekeeper.ntp.pps.tf[0] = 0;
- timekeeper.ntp.pps.tf[1] = 0;
- timekeeper.ntp.pps.tf[2] = 0;
- timekeeper.ntp.pps.fbase.tv_sec = timekeeper.ntp.pps.fbase.tv_nsec = 0;
- timekeeper.ntp.pps.freq = 0;
+ pps_reset_freq_interval(ntp);
+ ntp->pps.tf[0] = 0;
+ ntp->pps.tf[1] = 0;
+ ntp->pps.tf[2] = 0;
+ ntp->pps.fbase.tv_sec = ntp->pps.fbase.tv_nsec = 0;
+ ntp->pps.freq = 0;
}
/* Decrease pps_valid to indicate that another second has passed since
* the last PPS signal. When it reaches 0, indicate that PPS signal is
* missing.
*/
-static inline void pps_dec_valid(void)
+static inline void pps_dec_valid(struct timekeeper_ntp *ntp)
{
- if (timekeeper.ntp.pps.valid > 0)
- timekeeper.ntp.pps.valid--;
+ if (ntp->pps.valid > 0)
+ ntp->pps.valid--;
else {
- timekeeper.ntp.time_status &= ~(STA_PPSSIGNAL | STA_PPSJITTER |
+ ntp->time_status &= ~(STA_PPSSIGNAL | STA_PPSJITTER |
STA_PPSWANDER | STA_PPSERROR);
- pps_clear();
+ pps_clear(ntp);
}
}
-static inline void pps_set_freq(s64 freq)
+static inline void pps_set_freq(struct timekeeper_ntp *ntp, s64 freq)
{
- timekeeper.ntp.pps.freq = freq;
+ ntp->pps.freq = freq;
}
-static inline int is_error_status(int status)
+static inline int is_error_status(struct timekeeper_ntp *ntp, int status)
{
- return (timekeeper.ntp.time_status & (STA_UNSYNC|STA_CLOCKERR))
+ return (ntp->time_status & (STA_UNSYNC|STA_CLOCKERR))
/* PPS signal lost when either PPS time or
* PPS frequency synchronization requested
*/
- || ((timekeeper.ntp.time_status & (STA_PPSFREQ|STA_PPSTIME))
- && !(timekeeper.ntp.time_status & STA_PPSSIGNAL))
+ || ((ntp->time_status & (STA_PPSFREQ|STA_PPSTIME))
+ && !(ntp->time_status & STA_PPSSIGNAL))
/* PPS jitter exceeded when
* PPS time synchronization requested */
- || ((timekeeper.ntp.time_status & (STA_PPSTIME|STA_PPSJITTER))
+ || ((ntp->time_status & (STA_PPSTIME|STA_PPSJITTER))
== (STA_PPSTIME|STA_PPSJITTER))
/* PPS wander exceeded or calibration error when
* PPS frequency synchronization requested
*/
- || ((timekeeper.ntp.time_status & STA_PPSFREQ)
- && (timekeeper.ntp.time_status & (STA_PPSWANDER|STA_PPSERROR)));
+ || ((ntp->time_status & STA_PPSFREQ)
+ && (ntp->time_status & (STA_PPSWANDER|STA_PPSERROR)));
}
-static inline void pps_fill_timex(struct timex *txc)
+static inline void pps_fill_timex(struct timekeeper_ntp *ntp, struct timex *txc)
{
- txc->ppsfreq = shift_right((timekeeper.ntp.pps.freq >> PPM_SCALE_INV_SHIFT) *
+ txc->ppsfreq = shift_right((ntp->pps.freq >> PPM_SCALE_INV_SHIFT) *
PPM_SCALE_INV, NTP_SCALE_SHIFT);
- txc->jitter = timekeeper.ntp.pps.jitter;
- if (!(timekeeper.ntp.time_status & STA_NANO))
+ txc->jitter = ntp->pps.jitter;
+ if (!(ntp->time_status & STA_NANO))
txc->jitter /= NSEC_PER_USEC;
- txc->shift = timekeeper.ntp.pps.shift;
- txc->stabil = timekeeper.ntp.pps.stabil;
- txc->jitcnt = timekeeper.ntp.pps.jitcnt;
- txc->calcnt = timekeeper.ntp.pps.calcnt;
- txc->errcnt = timekeeper.ntp.pps.errcnt;
- txc->stbcnt = timekeeper.ntp.pps.stbcnt;
+ txc->shift = ntp->pps.shift;
+ txc->stabil = ntp->pps.stabil;
+ txc->jitcnt = ntp->pps.jitcnt;
+ txc->calcnt = ntp->pps.calcnt;
+ txc->errcnt = ntp->pps.errcnt;
+ txc->stbcnt = ntp->pps.stbcnt;
}
#else /* !CONFIG_NTP_PPS */
-static inline s64 ntp_offset_chunk(s64 offset)
+static inline s64 ntp_offset_chunk(struct timekeeper_ntp *ntp, s64 offset)
{
- return shift_right(offset, SHIFT_PLL + timekeeper.ntp.time_constant);
+ return shift_right(offset, SHIFT_PLL + ntp->time_constant);
}
-static inline void pps_reset_freq_interval(void) {}
-static inline void pps_clear(void) {}
-static inline void pps_dec_valid(void) {}
-static inline void pps_set_freq(s64 freq) {}
+static inline void pps_reset_freq_interval(struct timekeeper_ntp *ntp) {}
+static inline void pps_clear(struct timekeeper_ntp *ntp) {}
+static inline void pps_dec_valid(struct timekeeper_ntp *ntp) {}
+static inline void pps_set_freq(struct timekeeper_ntp *ntp, s64 freq) {}
-static inline int is_error_status(int status)
+static inline int is_error_status(struct timekeeper_ntp *ntp, int status)
{
return status & (STA_UNSYNC|STA_CLOCKERR);
}
-static inline void pps_fill_timex(struct timex *txc)
+static inline void pps_fill_timex(struct timekeeper_ntp *ntp, struct timex *txc)
{
/* PPS is not implemented, so these are zero */
txc->ppsfreq = 0;
@@ -160,9 +160,9 @@ static inline void pps_fill_timex(struct timex *txc)
* ntp_synced - Returns 1 if the NTP status is not UNSYNC
*
*/
-static inline int ntp_synced(void)
+static inline int ntp_synced(struct timekeeper_ntp *ntp)
{
- return !(timekeeper.ntp.time_status & STA_UNSYNC);
+ return !(ntp->time_status & STA_UNSYNC);
}
@@ -171,56 +171,57 @@ static inline int ntp_synced(void)
*/
/*
- * Update (timekeeper.ntp.tick_length, timekeeper.ntp.tick_length_base, timekeeper.ntp.tick_nsec),
- * based on (timekeeper.ntp.tick_usec, timekeeper.ntp.ntp_tick_adj, timekeeper.ntp.time_freq):
+ * Update (ntp->tick_length, ntp->tick_length_base, ntp->tick_nsec),
+ * based on (ntp->tick_usec, ntp->ntp_tick_adj, ntp->time_freq):
*/
-static void ntp_update_frequency(void)
+static void ntp_update_frequency(struct timekeeper_ntp *ntp)
{
u64 second_length;
u64 new_base;
- second_length = (u64)(timekeeper.ntp.tick_usec * NSEC_PER_USEC * USER_HZ)
+ second_length = (u64)(ntp->tick_usec * NSEC_PER_USEC * USER_HZ)
<< NTP_SCALE_SHIFT;
- second_length += timekeeper.ntp.ntp_tick_adj;
- second_length += timekeeper.ntp.time_freq;
+ second_length += ntp->ntp_tick_adj;
+ second_length += ntp->time_freq;
- timekeeper.ntp.tick_nsec = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT;
+ ntp->tick_nsec = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT;
new_base = div_u64(second_length, NTP_INTERVAL_FREQ);
/*
* Don't wait for the next second_overflow, apply
* the change to the tick length immediately:
*/
- timekeeper.ntp.tick_length += new_base - timekeeper.ntp.tick_length_base;
- timekeeper.ntp.tick_length_base = new_base;
+ ntp->tick_length += new_base - ntp->tick_length_base;
+ ntp->tick_length_base = new_base;
}
-static inline s64 ntp_update_offset_fll(s64 offset64, long secs)
+static inline s64 ntp_update_offset_fll(struct timekeeper_ntp *ntp,
+ s64 offset64, long secs)
{
- timekeeper.ntp.time_status &= ~STA_MODE;
+ ntp->time_status &= ~STA_MODE;
if (secs < MINSEC)
return 0;
- if (!(timekeeper.ntp.time_status & STA_FLL) && (secs <= MAXSEC))
+ if (!(ntp->time_status & STA_FLL) && (secs <= MAXSEC))
return 0;
- timekeeper.ntp.time_status |= STA_MODE;
+ ntp->time_status |= STA_MODE;
return div64_long(offset64 << (NTP_SCALE_SHIFT - SHIFT_FLL), secs);
}
-static void ntp_update_offset(long offset)
+static void ntp_update_offset(struct timekeeper_ntp *ntp, long offset)
{
s64 freq_adj;
s64 offset64;
long secs;
- if (!(timekeeper.ntp.time_status & STA_PLL))
+ if (!(ntp->time_status & STA_PLL))
return;
- if (!(timekeeper.ntp.time_status & STA_NANO))
+ if (!(ntp->time_status & STA_NANO))
offset *= NSEC_PER_USEC;
/*
@@ -234,57 +235,57 @@ static void ntp_update_offset(long offset)
* Select how the frequency is to be controlled
* and in which mode (PLL or FLL).
*/
- secs = get_seconds() - timekeeper.ntp.time_reftime;
- if (unlikely(timekeeper.ntp.time_status & STA_FREQHOLD))
+ secs = get_seconds() - ntp->time_reftime;
+ if (unlikely(ntp->time_status & STA_FREQHOLD))
secs = 0;
- timekeeper.ntp.time_reftime = get_seconds();
+ ntp->time_reftime = get_seconds();
offset64 = offset;
- freq_adj = ntp_update_offset_fll(offset64, secs);
+ freq_adj = ntp_update_offset_fll(ntp, offset64, secs);
/*
* Clamp update interval to reduce PLL gain with low
* sampling rate (e.g. intermittent network connection)
* to avoid instability.
*/
- if (unlikely(secs > 1 << (SHIFT_PLL + 1 + timekeeper.ntp.time_constant)))
- secs = 1 << (SHIFT_PLL + 1 + timekeeper.ntp.time_constant);
+ if (unlikely(secs > 1 << (SHIFT_PLL + 1 + ntp->time_constant)))
+ secs = 1 << (SHIFT_PLL + 1 + ntp->time_constant);
freq_adj += (offset64 * secs) <<
- (NTP_SCALE_SHIFT - 2 * (SHIFT_PLL + 2 + timekeeper.ntp.time_constant));
+ (NTP_SCALE_SHIFT - 2 * (SHIFT_PLL + 2 + ntp->time_constant));
- freq_adj = min(freq_adj + timekeeper.ntp.time_freq, MAXFREQ_SCALED);
+ freq_adj = min(freq_adj + ntp->time_freq, MAXFREQ_SCALED);
- timekeeper.ntp.time_freq = max(freq_adj, -MAXFREQ_SCALED);
+ ntp->time_freq = max(freq_adj, -MAXFREQ_SCALED);
- timekeeper.ntp.time_offset = div_s64(offset64 << NTP_SCALE_SHIFT,
+ ntp->time_offset = div_s64(offset64 << NTP_SCALE_SHIFT,
NTP_INTERVAL_FREQ);
}
/**
* ntp_clear - Clears the NTP state variables
*/
-void ntp_clear(void)
+void ntp_clear(struct timekeeper_ntp *ntp)
{
- timekeeper.ntp.time_adjust = 0; /* stop active adjtime() */
- timekeeper.ntp.time_status |= STA_UNSYNC;
- timekeeper.ntp.time_maxerror = NTP_PHASE_LIMIT;
- timekeeper.ntp.time_esterror = NTP_PHASE_LIMIT;
+ ntp->time_adjust = 0; /* stop active adjtime() */
+ ntp->time_status |= STA_UNSYNC;
+ ntp->time_maxerror = NTP_PHASE_LIMIT;
+ ntp->time_esterror = NTP_PHASE_LIMIT;
- ntp_update_frequency();
+ ntp_update_frequency(ntp);
- timekeeper.ntp.tick_length = timekeeper.ntp.tick_length_base;
- timekeeper.ntp.time_offset = 0;
+ ntp->tick_length = ntp->tick_length_base;
+ ntp->time_offset = 0;
/* Clear PPS state variables */
- pps_clear();
+ pps_clear(ntp);
}
-u64 ntp_tick_length(void)
+u64 ntp_tick_length(struct timekeeper_ntp *ntp)
{
- return timekeeper.ntp.tick_length;
+ return ntp->tick_length;
}
@@ -298,7 +299,7 @@ u64 ntp_tick_length(void)
*
* Also handles leap second processing, and returns leap offset
*/
-int second_overflow(unsigned long secs)
+int second_overflow(struct timekeeper_ntp *ntp, unsigned long secs)
{
s64 delta;
int leap = 0;
@@ -308,80 +309,80 @@ int second_overflow(unsigned long secs)
* day, the system clock is set back one second; if in leap-delete
* state, the system clock is set ahead one second.
*/
- switch (timekeeper.ntp.time_state) {
+ switch (ntp->time_state) {
case TIME_OK:
- if (timekeeper.ntp.time_status & STA_INS)
- timekeeper.ntp.time_state = TIME_INS;
- else if (timekeeper.ntp.time_status & STA_DEL)
- timekeeper.ntp.time_state = TIME_DEL;
+ if (ntp->time_status & STA_INS)
+ ntp->time_state = TIME_INS;
+ else if (ntp->time_status & STA_DEL)
+ ntp->time_state = TIME_DEL;
break;
case TIME_INS:
- if (!(timekeeper.ntp.time_status & STA_INS))
- timekeeper.ntp.time_state = TIME_OK;
+ if (!(ntp->time_status & STA_INS))
+ ntp->time_state = TIME_OK;
else if (secs % 86400 == 0) {
leap = -1;
- timekeeper.ntp.time_state = TIME_OOP;
+ ntp->time_state = TIME_OOP;
printk(KERN_NOTICE
"Clock: inserting leap second 23:59:60 UTC\n");
}
break;
case TIME_DEL:
- if (!(timekeeper.ntp.time_status & STA_DEL))
- timekeeper.ntp.time_state = TIME_OK;
+ if (!(ntp->time_status & STA_DEL))
+ ntp->time_state = TIME_OK;
else if ((secs + 1) % 86400 == 0) {
leap = 1;
- timekeeper.ntp.time_state = TIME_WAIT;
+ ntp->time_state = TIME_WAIT;
printk(KERN_NOTICE
"Clock: deleting leap second 23:59:59 UTC\n");
}
break;
case TIME_OOP:
- timekeeper.ntp.time_state = TIME_WAIT;
+ ntp->time_state = TIME_WAIT;
break;
case TIME_WAIT:
- if (!(timekeeper.ntp.time_status & (STA_INS | STA_DEL)))
- timekeeper.ntp.time_state = TIME_OK;
+ if (!(ntp->time_status & (STA_INS | STA_DEL)))
+ ntp->time_state = TIME_OK;
break;
}
/* Bump the maxerror field */
- timekeeper.ntp.time_maxerror += MAXFREQ / NSEC_PER_USEC;
- if (timekeeper.ntp.time_maxerror > NTP_PHASE_LIMIT) {
- timekeeper.ntp.time_maxerror = NTP_PHASE_LIMIT;
- timekeeper.ntp.time_status |= STA_UNSYNC;
+ ntp->time_maxerror += MAXFREQ / NSEC_PER_USEC;
+ if (ntp->time_maxerror > NTP_PHASE_LIMIT) {
+ ntp->time_maxerror = NTP_PHASE_LIMIT;
+ ntp->time_status |= STA_UNSYNC;
}
/* Compute the phase adjustment for the next second */
- timekeeper.ntp.tick_length = timekeeper.ntp.tick_length_base;
+ ntp->tick_length = ntp->tick_length_base;
- delta = ntp_offset_chunk(timekeeper.ntp.time_offset);
- timekeeper.ntp.time_offset -= delta;
- timekeeper.ntp.tick_length += delta;
+ delta = ntp_offset_chunk(ntp, ntp->time_offset);
+ ntp->time_offset -= delta;
+ ntp->tick_length += delta;
/* Check PPS signal */
- pps_dec_valid();
+ pps_dec_valid(ntp);
- if (!timekeeper.ntp.time_adjust)
+ if (!ntp->time_adjust)
goto out;
- if (timekeeper.ntp.time_adjust > MAX_TICKADJ) {
- timekeeper.ntp.time_adjust -= MAX_TICKADJ;
- timekeeper.ntp.tick_length += MAX_TICKADJ_SCALED;
+ if (ntp->time_adjust > MAX_TICKADJ) {
+ ntp->time_adjust -= MAX_TICKADJ;
+ ntp->tick_length += MAX_TICKADJ_SCALED;
goto out;
}
- if (timekeeper.ntp.time_adjust < -MAX_TICKADJ) {
- timekeeper.ntp.time_adjust += MAX_TICKADJ;
- timekeeper.ntp.tick_length -= MAX_TICKADJ_SCALED;
+ if (ntp->time_adjust < -MAX_TICKADJ) {
+ ntp->time_adjust += MAX_TICKADJ;
+ ntp->tick_length -= MAX_TICKADJ_SCALED;
goto out;
}
- timekeeper.ntp.tick_length +=
- (s64)(timekeeper.ntp.time_adjust * NSEC_PER_USEC / NTP_INTERVAL_FREQ)
+ ntp->tick_length +=
+ (s64)(ntp->time_adjust * NSEC_PER_USEC / NTP_INTERVAL_FREQ)
<< NTP_SCALE_SHIFT;
- timekeeper.ntp.time_adjust = 0;
+ ntp->time_adjust = 0;
out:
return leap;
@@ -394,6 +395,7 @@ static DECLARE_DELAYED_WORK(sync_cmos_work, sync_cmos_clock);
static void sync_cmos_clock(struct work_struct *work)
{
+ struct timekeeper_ntp *ntp = &timekeeper.ntp;
struct timespec now, next;
int fail = 1;
@@ -404,7 +406,7 @@ static void sync_cmos_clock(struct work_struct *work)
* This code is run on a timer. If the clock is set, that timer
* may not expire at the correct time. Thus, we adjust...
*/
- if (!ntp_synced()) {
+ if (!ntp_synced(ntp)) {
/*
* Not synced, exit, do not restart a timer (if one is
* running, let it run out).
@@ -413,7 +415,7 @@ static void sync_cmos_clock(struct work_struct *work)
}
getnstimeofday(&now);
- if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= timekeeper.ntp.tick_nsec / 2) {
+ if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= ntp->tick_nsec / 2) {
struct timespec adjust = now;
fail = -ENODEV;
@@ -457,74 +459,76 @@ void ntp_notify_cmos_timer(void) { }
/*
* Propagate a new txc->status value into the NTP state:
*/
-static inline void process_adj_status(struct timex *txc, struct timespec *ts)
+static inline void process_adj_status(struct timekeeper_ntp *ntp,
+ struct timex *txc, struct timespec *ts)
{
- if ((timekeeper.ntp.time_status & STA_PLL) && !(txc->status & STA_PLL)) {
- timekeeper.ntp.time_state = TIME_OK;
- timekeeper.ntp.time_status = STA_UNSYNC;
+ if ((ntp->time_status & STA_PLL) && !(txc->status & STA_PLL)) {
+ ntp->time_state = TIME_OK;
+ ntp->time_status = STA_UNSYNC;
/* restart PPS frequency calibration */
- pps_reset_freq_interval();
+ pps_reset_freq_interval(ntp);
}
/*
* If we turn on PLL adjustments then reset the
* reference time to current time.
*/
- if (!(timekeeper.ntp.time_status & STA_PLL) && (txc->status & STA_PLL))
- timekeeper.ntp.time_reftime = get_seconds();
+ if (!(ntp->time_status & STA_PLL) && (txc->status & STA_PLL))
+ ntp->time_reftime = get_seconds();
/* only set allowed bits */
- timekeeper.ntp.time_status &= STA_RONLY;
- timekeeper.ntp.time_status |= txc->status & ~STA_RONLY;
+ ntp->time_status &= STA_RONLY;
+ ntp->time_status |= txc->status & ~STA_RONLY;
}
-static inline void process_adjtimex_modes(struct timex *txc,
+static inline void process_adjtimex_modes(struct timekeeper_ntp *ntp,
+ struct timex *txc,
struct timespec *ts,
s32 *time_tai)
{
if (txc->modes & ADJ_STATUS)
- process_adj_status(txc, ts);
+ process_adj_status(ntp, txc, ts);
if (txc->modes & ADJ_NANO)
- timekeeper.ntp.time_status |= STA_NANO;
+ ntp->time_status |= STA_NANO;
if (txc->modes & ADJ_MICRO)
- timekeeper.ntp.time_status &= ~STA_NANO;
+ ntp->time_status &= ~STA_NANO;
if (txc->modes & ADJ_FREQUENCY) {
- timekeeper.ntp.time_freq = txc->freq * PPM_SCALE;
- timekeeper.ntp.time_freq = min(timekeeper.ntp.time_freq, MAXFREQ_SCALED);
- timekeeper.ntp.time_freq = max(timekeeper.ntp.time_freq, -MAXFREQ_SCALED);
- /* update timekeeper.ntp.pps.freq */
- pps_set_freq(timekeeper.ntp.time_freq);
+ ntp->time_freq = txc->freq * PPM_SCALE;
+ ntp->time_freq = min(ntp->time_freq, MAXFREQ_SCALED);
+ ntp->time_freq = max(ntp->time_freq, -MAXFREQ_SCALED);
+ /* update ntp->pps.freq */
+ pps_set_freq(ntp, ntp->time_freq);
}
if (txc->modes & ADJ_MAXERROR)
- timekeeper.ntp.time_maxerror = txc->maxerror;
+ ntp->time_maxerror = txc->maxerror;
if (txc->modes & ADJ_ESTERROR)
- timekeeper.ntp.time_esterror = txc->esterror;
+ ntp->time_esterror = txc->esterror;
if (txc->modes & ADJ_TIMECONST) {
- timekeeper.ntp.time_constant = txc->constant;
- if (!(timekeeper.ntp.time_status & STA_NANO))
- timekeeper.ntp.time_constant += 4;
- timekeeper.ntp.time_constant = min(timekeeper.ntp.time_constant, (long)MAXTC);
- timekeeper.ntp.time_constant = max(timekeeper.ntp.time_constant, 0l);
+ ntp->time_constant = txc->constant;
+ if (!(ntp->time_status & STA_NANO))
+ ntp->time_constant += 4;
+ ntp->time_constant = min(ntp->time_constant, (long)MAXTC);
+ ntp->time_constant = max(ntp->time_constant, 0l);
}
if (txc->modes & ADJ_TAI && txc->constant > 0)
*time_tai = txc->constant;
if (txc->modes & ADJ_OFFSET)
- ntp_update_offset(txc->offset);
+ ntp_update_offset(ntp, txc->offset);
if (txc->modes & ADJ_TICK)
- timekeeper.ntp.tick_usec = txc->tick;
+ ntp->tick_usec = txc->tick;
if (txc->modes & (ADJ_TICK|ADJ_FREQUENCY|ADJ_OFFSET))
- ntp_update_frequency();
+ ntp_update_frequency(ntp);
}
@@ -566,54 +570,55 @@ int ntp_validate_timex(struct timex *txc)
* adjtimex mainly allows reading (and writing, if superuser) of
* kernel time-keeping variables. used by xntpd.
*/
-int __do_adjtimex(struct timex *txc, struct timespec *ts, s32 *time_tai)
+int __do_adjtimex(struct timekeeper_ntp *ntp, struct timex *txc,
+ struct timespec *ts, s32 *time_tai)
{
int result;
if (txc->modes & ADJ_ADJTIME) {
- long save_adjust = timekeeper.ntp.time_adjust;
+ long save_adjust = ntp->time_adjust;
if (!(txc->modes & ADJ_OFFSET_READONLY)) {
/* adjtime() is independent from ntp_adjtime() */
- timekeeper.ntp.time_adjust = txc->offset;
- ntp_update_frequency();
+ ntp->time_adjust = txc->offset;
+ ntp_update_frequency(ntp);
}
txc->offset = save_adjust;
} else {
/* If there are input parameters, then process them: */
if (txc->modes)
- process_adjtimex_modes(txc, ts, time_tai);
+ process_adjtimex_modes(ntp, txc, ts, time_tai);
txc->offset =
- shift_right(timekeeper.ntp.time_offset * NTP_INTERVAL_FREQ,
+ shift_right(ntp->time_offset * NTP_INTERVAL_FREQ,
NTP_SCALE_SHIFT);
- if (!(timekeeper.ntp.time_status & STA_NANO))
+ if (!(ntp->time_status & STA_NANO))
txc->offset /= NSEC_PER_USEC;
}
- result = timekeeper.ntp.time_state; /* mostly `TIME_OK' */
+ result = ntp->time_state; /* mostly `TIME_OK' */
/* check for errors */
- if (is_error_status(timekeeper.ntp.time_status))
+ if (is_error_status(ntp, ntp->time_status))
result = TIME_ERROR;
- txc->freq = shift_right((timekeeper.ntp.time_freq >> PPM_SCALE_INV_SHIFT) *
+ txc->freq = shift_right((ntp->time_freq >> PPM_SCALE_INV_SHIFT) *
PPM_SCALE_INV, NTP_SCALE_SHIFT);
- txc->maxerror = timekeeper.ntp.time_maxerror;
- txc->esterror = timekeeper.ntp.time_esterror;
- txc->status = timekeeper.ntp.time_status;
- txc->constant = timekeeper.ntp.time_constant;
+ txc->maxerror = ntp->time_maxerror;
+ txc->esterror = ntp->time_esterror;
+ txc->status = ntp->time_status;
+ txc->constant = ntp->time_constant;
txc->precision = 1;
txc->tolerance = MAXFREQ_SCALED / PPM_SCALE;
- txc->tick = timekeeper.ntp.tick_usec;
+ txc->tick = ntp->tick_usec;
txc->tai = *time_tai;
/* fill PPS status fields */
- pps_fill_timex(txc);
+ pps_fill_timex(ntp, txc);
txc->time.tv_sec = ts->tv_sec;
txc->time.tv_usec = ts->tv_nsec;
- if (!(timekeeper.ntp.time_status & STA_NANO))
+ if (!(ntp->time_status & STA_NANO))
txc->time.tv_usec /= NSEC_PER_USEC;
return result;
@@ -648,34 +653,35 @@ static inline struct pps_normtime pps_normalize_ts(struct timespec ts)
}
/* get current phase correction and jitter */
-static inline long pps_phase_filter_get(long *jitter)
+static inline long pps_phase_filter_get(struct timekeeper_ntp *ntp,
+ long *jitter)
{
- *jitter = timekeeper.ntp.pps.tf[0] - timekeeper.ntp.pps.tf[1];
+ *jitter = ntp->pps.tf[0] - ntp->pps.tf[1];
if (*jitter < 0)
*jitter = -*jitter;
/* TODO: test various filters */
- return timekeeper.ntp.pps.tf[0];
+ return ntp->pps.tf[0];
}
/* add the sample to the phase filter */
-static inline void pps_phase_filter_add(long err)
+static inline void pps_phase_filter_add(struct timekeeper_ntp *ntp, long err)
{
- timekeeper.ntp.pps.tf[2] = timekeeper.ntp.pps.tf[1];
- timekeeper.ntp.pps.tf[1] = timekeeper.ntp.pps.tf[0];
- timekeeper.ntp.pps.tf[0] = err;
+ ntp->pps.tf[2] = ntp->pps.tf[1];
+ ntp->pps.tf[1] = ntp->pps.tf[0];
+ ntp->pps.tf[0] = err;
}
/* decrease frequency calibration interval length.
* It is halved after four consecutive unstable intervals.
*/
-static inline void pps_dec_freq_interval(void)
+static inline void pps_dec_freq_interval(struct timekeeper_ntp *ntp)
{
- if (--timekeeper.ntp.pps.intcnt <= -PPS_INTCOUNT) {
- timekeeper.ntp.pps.intcnt = -PPS_INTCOUNT;
- if (timekeeper.ntp.pps.shift > PPS_INTMIN) {
- timekeeper.ntp.pps.shift--;
- timekeeper.ntp.pps.intcnt = 0;
+ if (--ntp->pps.intcnt <= -PPS_INTCOUNT) {
+ ntp->pps.intcnt = -PPS_INTCOUNT;
+ if (ntp->pps.shift > PPS_INTMIN) {
+ ntp->pps.shift--;
+ ntp->pps.intcnt = 0;
}
}
}
@@ -683,13 +689,13 @@ static inline void pps_dec_freq_interval(void)
/* increase frequency calibration interval length.
* It is doubled after four consecutive stable intervals.
*/
-static inline void pps_inc_freq_interval(void)
+static inline void pps_inc_freq_interval(struct timekeeper_ntp *ntp)
{
- if (++timekeeper.ntp.pps.intcnt >= PPS_INTCOUNT) {
- timekeeper.ntp.pps.intcnt = PPS_INTCOUNT;
- if (timekeeper.ntp.pps.shift < PPS_INTMAX) {
- timekeeper.ntp.pps.shift++;
- timekeeper.ntp.pps.intcnt = 0;
+ if (++ntp->pps.intcnt >= PPS_INTCOUNT) {
+ ntp->pps.intcnt = PPS_INTCOUNT;
+ if (ntp->pps.shift < PPS_INTMAX) {
+ ntp->pps.shift++;
+ ntp->pps.intcnt = 0;
}
}
}
@@ -703,16 +709,17 @@ static inline void pps_inc_freq_interval(void)
* too long, the data are discarded.
* Returns the difference between old and new frequency values.
*/
-static long hardpps_update_freq(struct pps_normtime freq_norm)
+static long hardpps_update_freq(struct timekeeper_ntp *ntp,
+ struct pps_normtime freq_norm)
{
long delta, delta_mod;
s64 ftemp;
/* check if the frequency interval was too long */
- if (freq_norm.sec > (2 << timekeeper.ntp.pps.shift)) {
- timekeeper.ntp.time_status |= STA_PPSERROR;
- timekeeper.ntp.pps.errcnt++;
- pps_dec_freq_interval();
+ if (freq_norm.sec > (2 << ntp->pps.shift)) {
+ ntp->time_status |= STA_PPSERROR;
+ ntp->pps.errcnt++;
+ pps_dec_freq_interval(ntp);
pr_err("hardpps: PPSERROR: interval too long - %ld s\n",
freq_norm.sec);
return 0;
@@ -724,15 +731,15 @@ static long hardpps_update_freq(struct pps_normtime freq_norm)
*/
ftemp = div_s64(((s64)(-freq_norm.nsec)) << NTP_SCALE_SHIFT,
freq_norm.sec);
- delta = shift_right(ftemp - timekeeper.ntp.pps.freq, NTP_SCALE_SHIFT);
- timekeeper.ntp.pps.freq = ftemp;
+ delta = shift_right(ftemp - ntp->pps.freq, NTP_SCALE_SHIFT);
+ ntp->pps.freq = ftemp;
if (delta > PPS_MAXWANDER || delta < -PPS_MAXWANDER) {
pr_warning("hardpps: PPSWANDER: change=%ld\n", delta);
- timekeeper.ntp.time_status |= STA_PPSWANDER;
- timekeeper.ntp.pps.stbcnt++;
- pps_dec_freq_interval();
+ ntp->time_status |= STA_PPSWANDER;
+ ntp->pps.stbcnt++;
+ pps_dec_freq_interval(ntp);
} else { /* good sample */
- pps_inc_freq_interval();
+ pps_inc_freq_interval(ntp);
}
/* the stability metric is calculated as the average of recent
@@ -742,49 +749,49 @@ static long hardpps_update_freq(struct pps_normtime freq_norm)
delta_mod = delta;
if (delta_mod < 0)
delta_mod = -delta_mod;
- timekeeper.ntp.pps.stabil += (div_s64(((s64)delta_mod) <<
+ ntp->pps.stabil += (div_s64(((s64)delta_mod) <<
(NTP_SCALE_SHIFT - SHIFT_USEC),
- NSEC_PER_USEC) - timekeeper.ntp.pps.stabil) >> PPS_INTMIN;
+ NSEC_PER_USEC) - ntp->pps.stabil) >> PPS_INTMIN;
/* if enabled, the system clock frequency is updated */
- if ((timekeeper.ntp.time_status & STA_PPSFREQ) != 0 &&
- (timekeeper.ntp.time_status & STA_FREQHOLD) == 0) {
- timekeeper.ntp.time_freq = timekeeper.ntp.pps.freq;
- ntp_update_frequency();
+ if ((ntp->time_status & STA_PPSFREQ) != 0 &&
+ (ntp->time_status & STA_FREQHOLD) == 0) {
+ ntp->time_freq = ntp->pps.freq;
+ ntp_update_frequency(ntp);
}
return delta;
}
/* correct REALTIME clock phase error against PPS signal */
-static void hardpps_update_phase(long error)
+static void hardpps_update_phase(struct timekeeper_ntp *ntp, long error)
{
long correction = -error;
long jitter;
/* add the sample to the median filter */
- pps_phase_filter_add(correction);
- correction = pps_phase_filter_get(&jitter);
+ pps_phase_filter_add(ntp, correction);
+ correction = pps_phase_filter_get(ntp, &jitter);
/* Nominal jitter is due to PPS signal noise. If it exceeds the
* threshold, the sample is discarded; otherwise, if so enabled,
* the time offset is updated.
*/
- if (jitter > (timekeeper.ntp.pps.jitter << PPS_POPCORN)) {
+ if (jitter > (ntp->pps.jitter << PPS_POPCORN)) {
pr_warning("hardpps: PPSJITTER: jitter=%ld, limit=%ld\n",
- jitter, (timekeeper.ntp.pps.jitter << PPS_POPCORN));
- timekeeper.ntp.time_status |= STA_PPSJITTER;
- timekeeper.ntp.pps.jitcnt++;
- } else if (timekeeper.ntp.time_status & STA_PPSTIME) {
+ jitter, (ntp->pps.jitter << PPS_POPCORN));
+ ntp->time_status |= STA_PPSJITTER;
+ ntp->pps.jitcnt++;
+ } else if (ntp->time_status & STA_PPSTIME) {
/* correct the time using the phase offset */
- timekeeper.ntp.time_offset =
+ ntp->time_offset =
div_s64(((s64)correction) << NTP_SCALE_SHIFT,
NTP_INTERVAL_FREQ);
/* cancel running adjtime() */
- timekeeper.ntp.time_adjust = 0;
+ ntp->time_adjust = 0;
}
/* update jitter */
- timekeeper.ntp.pps.jitter += (jitter - timekeeper.ntp.pps.jitter) >> PPS_INTMIN;
+ ntp->pps.jitter += (jitter - ntp->pps.jitter) >> PPS_INTMIN;
}
/*
@@ -799,38 +806,39 @@ static void hardpps_update_phase(long error)
* This code is based on David Mills's reference nanokernel
* implementation. It was mostly rewritten but keeps the same idea.
*/
-void __hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
+void __hardpps(struct timekeeper_ntp *ntp, const struct timespec *phase_ts,
+ const struct timespec *raw_ts)
{
struct pps_normtime pts_norm, freq_norm;
pts_norm = pps_normalize_ts(*phase_ts);
/* clear the error bits, they will be set again if needed */
- timekeeper.ntp.time_status &= ~(STA_PPSJITTER | STA_PPSWANDER | STA_PPSERROR);
+ ntp->time_status &= ~(STA_PPSJITTER | STA_PPSWANDER | STA_PPSERROR);
/* indicate signal presence */
- timekeeper.ntp.time_status |= STA_PPSSIGNAL;
- timekeeper.ntp.pps.valid = PPS_VALID;
+ ntp->time_status |= STA_PPSSIGNAL;
+ ntp->pps.valid = PPS_VALID;
/* when called for the first time,
* just start the frequency interval */
- if (unlikely(timekeeper.ntp.pps.fbase.tv_sec == 0)) {
- timekeeper.ntp.pps.fbase = *raw_ts;
+ if (unlikely(ntp->pps.fbase.tv_sec == 0)) {
+ ntp->pps.fbase = *raw_ts;
return;
}
/* ok, now we have a base for frequency calculation */
freq_norm = pps_normalize_ts(timespec_sub(*raw_ts,
- timekeeper.ntp.pps.fbase));
+ ntp->pps.fbase));
/* check that the signal is in the range
* [1s - MAXFREQ us, 1s + MAXFREQ us], otherwise reject it */
if ((freq_norm.sec == 0) ||
(freq_norm.nsec > MAXFREQ * freq_norm.sec) ||
(freq_norm.nsec < -MAXFREQ * freq_norm.sec)) {
- timekeeper.ntp.time_status |= STA_PPSJITTER;
+ ntp->time_status |= STA_PPSJITTER;
/* restart the frequency calibration interval */
- timekeeper.ntp.pps.fbase = *raw_ts;
+ ntp->pps.fbase = *raw_ts;
pr_err("hardpps: PPSJITTER: bad pulse\n");
return;
}
@@ -838,29 +846,31 @@ void __hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
/* signal is ok */
/* check if the current frequency interval is finished */
- if (freq_norm.sec >= (1 << timekeeper.ntp.pps.shift)) {
- timekeeper.ntp.pps.calcnt++;
+ if (freq_norm.sec >= (1 << ntp->pps.shift)) {
+ ntp->pps.calcnt++;
/* restart the frequency calibration interval */
- timekeeper.ntp.pps.fbase = *raw_ts;
- hardpps_update_freq(freq_norm);
+ ntp->pps.fbase = *raw_ts;
+ hardpps_update_freq(ntp, freq_norm);
}
- hardpps_update_phase(pts_norm.nsec);
+ hardpps_update_phase(ntp, pts_norm.nsec);
}
#endif /* CONFIG_NTP_PPS */
static int __init ntp_tick_adj_setup(char *str)
{
- timekeeper.ntp.ntp_tick_adj = simple_strtol(str, NULL, 0);
- timekeeper.ntp.ntp_tick_adj <<= NTP_SCALE_SHIFT;
+ struct timekeeper_ntp *ntp = &timekeeper.ntp;
+
+ ntp->ntp_tick_adj = simple_strtol(str, NULL, 0);
+ ntp->ntp_tick_adj <<= NTP_SCALE_SHIFT;
return 1;
}
__setup("ntp_tick_adj=", ntp_tick_adj_setup);
-void __init ntp_init(void)
+void __init ntp_init(struct timekeeper_ntp *ntp)
{
- ntp_clear();
+ ntp_clear(ntp);
}
diff --git a/kernel/time/ntp_internal.h b/kernel/time/ntp_internal.h
index 1950cb4..970e260 100644
--- a/kernel/time/ntp_internal.h
+++ b/kernel/time/ntp_internal.h
@@ -1,12 +1,16 @@
#ifndef _LINUX_NTP_INTERNAL_H
#define _LINUX_NTP_INTERNAL_H
-extern void ntp_init(void);
-extern void ntp_clear(void);
+struct timekeeper_ntp;
+
+extern void ntp_init(struct timekeeper_ntp *ntp);
+extern void ntp_clear(struct timekeeper_ntp *ntp);
/* Returns how long ticks are at present, in ns / 2^NTP_SCALE_SHIFT. */
-extern u64 ntp_tick_length(void);
-extern int second_overflow(unsigned long secs);
+extern u64 ntp_tick_length(struct timekeeper_ntp *ntp);
+extern int second_overflow(struct timekeeper_ntp *ntp, unsigned long secs);
extern int ntp_validate_timex(struct timex *);
-extern int __do_adjtimex(struct timex *, struct timespec *, s32 *);
-extern void __hardpps(const struct timespec *, const struct timespec *);
+extern int __do_adjtimex(struct timekeeper_ntp *ntp, struct timex *,
+ struct timespec *, s32 *);
+extern void __hardpps(struct timekeeper_ntp *ntp, const struct timespec *,
+ const struct timespec *);
#endif /* _LINUX_NTP_INTERNAL_H */
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index d1ecafb..2210abb 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -260,7 +260,7 @@ static void timekeeping_update(struct timekeeper *tk, unsigned int action)
{
if (action & TK_CLEAR_NTP) {
tk->ntp_error = 0;
- ntp_clear();
+ ntp_clear(&tk->ntp);
}
update_vsyscall(tk);
update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET);
@@ -819,7 +819,7 @@ void __init timekeeping_init(void)
raw_spin_lock_irqsave(&timekeeper_lock, flags);
write_seqcount_begin(&timekeeper_seq);
- ntp_init();
+ ntp_init(&tk->ntp);
clock = clocksource_default_clock();
if (clock->enable)
@@ -1087,7 +1087,7 @@ static __always_inline int timekeeping_bigadjust(struct timekeeper *tk,
* Now calculate the error in (1 << look_ahead) ticks, but first
* remove the single look ahead already included in the error.
*/
- tick_error = ntp_tick_length() >> (tk->ntp_error_shift + 1);
+ tick_error = ntp_tick_length(&tk->ntp) >> (tk->ntp_error_shift + 1);
tick_error -= tk->xtime_interval >> 1;
error = ((error - tick_error) >> look_ahead) + tick_error;
@@ -1274,7 +1274,7 @@ static inline unsigned int accumulate_nsecs_to_secs(struct timekeeper *tk)
tk->xtime_sec++;
/* Figure out if its a leap sec and apply if needed */
- leap = second_overflow(tk->xtime_sec);
+ leap = second_overflow(&tk->ntp, tk->xtime_sec);
if (unlikely(leap)) {
struct timespec ts;
@@ -1331,7 +1331,7 @@ static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
tk->raw_time.tv_nsec = raw_nsecs;
/* Accumulate error between NTP and clock interval */
- tk->ntp_error += ntp_tick_length() << shift;
+ tk->ntp_error += ntp_tick_length(&tk->ntp) << shift;
tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) <<
(tk->ntp_error_shift + shift);
@@ -1408,7 +1408,7 @@ static void update_wall_time(void)
shift = ilog2(offset) - ilog2(tk->cycle_interval);
shift = max(0, shift);
/* Bound shift to one less than what overflows tick_length */
- maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1;
+ maxshift = (64 - (ilog2(ntp_tick_length(&tk->ntp))+1)) - 1;
shift = min(shift, maxshift);
while (offset >= tk->cycle_interval) {
offset = logarithmic_accumulation(tk, offset, shift);
@@ -1703,7 +1703,7 @@ int do_adjtimex(struct timex *txc)
write_seqcount_begin(&timekeeper_seq);
orig_tai = tai = tk->tai_offset;
- ret = __do_adjtimex(txc, &ts, &tai);
+ ret = __do_adjtimex(&tk->ntp, txc, &ts, &tai);
if (tai != orig_tai) {
__timekeeping_set_tai_offset(tk, tai);
@@ -1724,12 +1724,13 @@ int do_adjtimex(struct timex *txc)
*/
void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
{
+ struct timekeeper *tk = &timekeeper;
unsigned long flags;
raw_spin_lock_irqsave(&timekeeper_lock, flags);
write_seqcount_begin(&timekeeper_seq);
- __hardpps(phase_ts, raw_ts);
+ __hardpps(&tk->ntp, phase_ts, raw_ts);
write_seqcount_end(&timekeeper_seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
--
1.7.10.4
--
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