#include <linux/mm.h>
#include <linux/time.h>
-#include <linux/timer.h>
#include <linux/timex.h>
#include <linux/jiffies.h>
#include <linux/hrtimer.h>
#include <linux/capability.h>
#include <linux/math64.h>
+#include <linux/clocksource.h>
+#include <linux/workqueue.h>
#include <asm/timex.h>
/*
*/
unsigned long tick_usec = TICK_USEC; /* USER_HZ period (usec) */
unsigned long tick_nsec; /* ACTHZ period (nsec) */
-static u64 tick_length, tick_length_base;
+u64 tick_length;
+static u64 tick_length_base;
+
+static struct hrtimer leap_timer;
#define MAX_TICKADJ 500 /* microsecs */
#define MAX_TICKADJ_SCALED (((u64)(MAX_TICKADJ * NSEC_PER_USEC) << \
- TICK_LENGTH_SHIFT) / NTP_INTERVAL_FREQ)
+ NTP_SCALE_SHIFT) / NTP_INTERVAL_FREQ)
/*
* phase-lock loop variables
/* TIME_ERROR prevents overwriting the CMOS clock */
static int time_state = TIME_OK; /* clock synchronization status */
int time_status = STA_UNSYNC; /* clock status bits */
+static long time_tai; /* TAI offset (s) */
static s64 time_offset; /* time adjustment (ns) */
static long time_constant = 2; /* pll time constant */
long time_maxerror = NTP_PHASE_LIMIT; /* maximum error (us) */
long time_esterror = NTP_PHASE_LIMIT; /* estimated error (us) */
-long time_freq; /* frequency offset (scaled ppm)*/
+static s64 time_freq; /* frequency offset (scaled ns/s)*/
static long time_reftime; /* time at last adjustment (s) */
long time_adjust;
static long ntp_tick_adj;
static void ntp_update_frequency(void)
{
u64 second_length = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ)
- << TICK_LENGTH_SHIFT;
- second_length += (s64)ntp_tick_adj << TICK_LENGTH_SHIFT;
- second_length += (s64)time_freq << (TICK_LENGTH_SHIFT - SHIFT_NSEC);
+ << NTP_SCALE_SHIFT;
+ second_length += (s64)ntp_tick_adj << NTP_SCALE_SHIFT;
+ second_length += time_freq;
tick_length_base = second_length;
- tick_nsec = div_u64(second_length, HZ) >> TICK_LENGTH_SHIFT;
+ tick_nsec = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT;
tick_length_base = div_u64(tick_length_base, NTP_INTERVAL_FREQ);
}
if (!(time_status & STA_PLL))
return;
- time_offset = offset;
if (!(time_status & STA_NANO))
- time_offset *= NSEC_PER_USEC;
+ offset *= NSEC_PER_USEC;
/*
* Scale the phase adjustment and
* clamp to the operating range.
*/
- time_offset = min(time_offset, (s64)MAXPHASE * NSEC_PER_USEC);
- time_offset = max(time_offset, (s64)-MAXPHASE * NSEC_PER_USEC);
+ offset = min(offset, MAXPHASE);
+ offset = max(offset, -MAXPHASE);
/*
* Select how the frequency is to be controlled
mtemp = xtime.tv_sec - time_reftime;
time_reftime = xtime.tv_sec;
- freq_adj = time_offset * mtemp;
- freq_adj = shift_right(freq_adj, time_constant * 2 +
- (SHIFT_PLL + 2) * 2 - SHIFT_NSEC);
+ freq_adj = (s64)offset * mtemp;
+ freq_adj <<= NTP_SCALE_SHIFT - 2 * (SHIFT_PLL + 2 + time_constant);
time_status &= ~STA_MODE;
if (mtemp >= MINSEC && (time_status & STA_FLL || mtemp > MAXSEC)) {
- freq_adj += div_s64(time_offset << (SHIFT_NSEC - SHIFT_FLL), mtemp);
+ freq_adj += div_s64((s64)offset << (NTP_SCALE_SHIFT - SHIFT_FLL),
+ mtemp);
time_status |= STA_MODE;
}
freq_adj += time_freq;
- freq_adj = min(freq_adj, (s64)MAXFREQ_NSEC);
- time_freq = max(freq_adj, (s64)-MAXFREQ_NSEC);
- time_offset = div_s64(time_offset, NTP_INTERVAL_FREQ);
- time_offset <<= SHIFT_UPDATE;
+ freq_adj = min(freq_adj, MAXFREQ_SCALED);
+ time_freq = max(freq_adj, -MAXFREQ_SCALED);
+
+ time_offset = div_s64((s64)offset << NTP_SCALE_SHIFT, NTP_INTERVAL_FREQ);
}
/**
}
/*
- * this routine handles the overflow of the microsecond field
- *
- * The tricky bits of code to handle the accurate clock support
- * were provided by Dave Mills (Mills@UDEL.EDU) of NTP fame.
- * They were originally developed for SUN and DEC kernels.
- * All the kudos should go to Dave for this stuff.
+ * Leap second processing. If in leap-insert state at the end of the
+ * day, the system clock is set back one second; if in leap-delete
+ * state, the system clock is set ahead one second.
*/
-void second_overflow(void)
+static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
{
- long time_adj;
+ enum hrtimer_restart res = HRTIMER_NORESTART;
- /* Bump the maxerror field */
- time_maxerror += MAXFREQ >> SHIFT_USEC;
- if (time_maxerror > NTP_PHASE_LIMIT) {
- time_maxerror = NTP_PHASE_LIMIT;
- time_status |= STA_UNSYNC;
- }
+ write_seqlock(&xtime_lock);
- /*
- * Leap second processing. If in leap-insert state at the end of the
- * day, the system clock is set back one second; if in leap-delete
- * state, the system clock is set ahead one second. The microtime()
- * routine or external clock driver will insure that reported time is
- * always monotonic. The ugly divides should be replaced.
- */
switch (time_state) {
case TIME_OK:
- if (time_status & STA_INS)
- time_state = TIME_INS;
- else if (time_status & STA_DEL)
- time_state = TIME_DEL;
break;
case TIME_INS:
- if (xtime.tv_sec % 86400 == 0) {
- xtime.tv_sec--;
- wall_to_monotonic.tv_sec++;
- time_state = TIME_OOP;
- printk(KERN_NOTICE "Clock: inserting leap second "
- "23:59:60 UTC\n");
- }
+ xtime.tv_sec--;
+ wall_to_monotonic.tv_sec++;
+ time_state = TIME_OOP;
+ printk(KERN_NOTICE "Clock: "
+ "inserting leap second 23:59:60 UTC\n");
+ hrtimer_add_expires_ns(&leap_timer, NSEC_PER_SEC);
+ res = HRTIMER_RESTART;
break;
case TIME_DEL:
- if ((xtime.tv_sec + 1) % 86400 == 0) {
- xtime.tv_sec++;
- wall_to_monotonic.tv_sec--;
- time_state = TIME_WAIT;
- printk(KERN_NOTICE "Clock: deleting leap second "
- "23:59:59 UTC\n");
- }
+ xtime.tv_sec++;
+ time_tai--;
+ wall_to_monotonic.tv_sec--;
+ time_state = TIME_WAIT;
+ printk(KERN_NOTICE "Clock: "
+ "deleting leap second 23:59:59 UTC\n");
break;
case TIME_OOP:
+ time_tai++;
time_state = TIME_WAIT;
- break;
+ /* fall through */
case TIME_WAIT:
if (!(time_status & (STA_INS | STA_DEL)))
time_state = TIME_OK;
+ break;
+ }
+ update_vsyscall(&xtime, clock);
+
+ write_sequnlock(&xtime_lock);
+
+ return res;
+}
+
+/*
+ * this routine handles the overflow of the microsecond field
+ *
+ * The tricky bits of code to handle the accurate clock support
+ * were provided by Dave Mills (Mills@UDEL.EDU) of NTP fame.
+ * They were originally developed for SUN and DEC kernels.
+ * All the kudos should go to Dave for this stuff.
+ */
+void second_overflow(void)
+{
+ s64 time_adj;
+
+ /* Bump the maxerror field */
+ time_maxerror += MAXFREQ / NSEC_PER_USEC;
+ if (time_maxerror > NTP_PHASE_LIMIT) {
+ time_maxerror = NTP_PHASE_LIMIT;
+ time_status |= STA_UNSYNC;
}
/*
tick_length = tick_length_base;
time_adj = shift_right(time_offset, SHIFT_PLL + time_constant);
time_offset -= time_adj;
- tick_length += (s64)time_adj << (TICK_LENGTH_SHIFT - SHIFT_UPDATE);
+ tick_length += time_adj;
if (unlikely(time_adjust)) {
if (time_adjust > MAX_TICKADJ) {
tick_length -= MAX_TICKADJ_SCALED;
} else {
tick_length += (s64)(time_adjust * NSEC_PER_USEC /
- NTP_INTERVAL_FREQ) << TICK_LENGTH_SHIFT;
+ NTP_INTERVAL_FREQ) << NTP_SCALE_SHIFT;
time_adjust = 0;
}
}
}
-/*
- * Return how long ticks are at the moment, that is, how much time
- * update_wall_time_one_tick will add to xtime next time we call it
- * (assuming no calls to do_adjtimex in the meantime).
- * The return value is in fixed-point nanoseconds shifted by the
- * specified number of bits to the right of the binary point.
- * This function has no side-effects.
- */
-u64 current_tick_length(void)
-{
- return tick_length;
-}
-
#ifdef CONFIG_GENERIC_CMOS_UPDATE
/* Disable the cmos update - used by virtualization and embedded */
int no_sync_cmos_clock __read_mostly;
-static void sync_cmos_clock(unsigned long dummy);
+static void sync_cmos_clock(struct work_struct *work);
-static DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
+static DECLARE_DELAYED_WORK(sync_cmos_work, sync_cmos_clock);
-static void sync_cmos_clock(unsigned long dummy)
+static void sync_cmos_clock(struct work_struct *work)
{
struct timespec now, next;
int fail = 1;
if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec / 2)
fail = update_persistent_clock(now);
- next.tv_nsec = (NSEC_PER_SEC / 2) - now.tv_nsec;
+ next.tv_nsec = (NSEC_PER_SEC / 2) - now.tv_nsec - (TICK_NSEC / 2);
if (next.tv_nsec <= 0)
next.tv_nsec += NSEC_PER_SEC;
next.tv_sec++;
next.tv_nsec -= NSEC_PER_SEC;
}
- mod_timer(&sync_cmos_timer, jiffies + timespec_to_jiffies(&next));
+ schedule_delayed_work(&sync_cmos_work, timespec_to_jiffies(&next));
}
static void notify_cmos_timer(void)
{
if (!no_sync_cmos_clock)
- mod_timer(&sync_cmos_timer, jiffies + 1);
+ schedule_delayed_work(&sync_cmos_work, 0);
}
#else
int do_adjtimex(struct timex *txc)
{
struct timespec ts;
- long save_adjust;
int result;
- /* In order to modify anything, you gotta be super-user! */
- if (txc->modes && !capable(CAP_SYS_TIME))
- return -EPERM;
-
- /* Now we validate the data before disabling interrupts */
-
- if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT) {
+ /* Validate the data before disabling interrupts */
+ if (txc->modes & ADJ_ADJTIME) {
/* singleshot must not be used with any other mode bits */
- if (txc->modes & ~ADJ_OFFSET_SS_READ)
+ if (!(txc->modes & ADJ_OFFSET_SINGLESHOT))
return -EINVAL;
+ if (!(txc->modes & ADJ_OFFSET_READONLY) &&
+ !capable(CAP_SYS_TIME))
+ return -EPERM;
+ } else {
+ /* In order to modify anything, you gotta be super-user! */
+ if (txc->modes && !capable(CAP_SYS_TIME))
+ return -EPERM;
+
+ /* if the quartz is off by more than 10% something is VERY wrong! */
+ if (txc->modes & ADJ_TICK &&
+ (txc->tick < 900000/USER_HZ ||
+ txc->tick > 1100000/USER_HZ))
+ return -EINVAL;
+
+ if (txc->modes & ADJ_STATUS && time_state != TIME_OK)
+ hrtimer_cancel(&leap_timer);
}
- /* if the quartz is off by more than 10% something is VERY wrong ! */
- if (txc->modes & ADJ_TICK)
- if (txc->tick < 900000/USER_HZ ||
- txc->tick > 1100000/USER_HZ)
- return -EINVAL;
+ getnstimeofday(&ts);
write_seqlock_irq(&xtime_lock);
- /* Save for later - semantics of adjtime is to return old value */
- save_adjust = time_adjust;
-
/* If there are input parameters, then process them */
+ if (txc->modes & ADJ_ADJTIME) {
+ long save_adjust = time_adjust;
+
+ if (!(txc->modes & ADJ_OFFSET_READONLY)) {
+ /* adjtime() is independent from ntp_adjtime() */
+ time_adjust = txc->offset;
+ ntp_update_frequency();
+ }
+ txc->offset = save_adjust;
+ goto adj_done;
+ }
if (txc->modes) {
+ long sec;
+
if (txc->modes & ADJ_STATUS) {
if ((time_status & STA_PLL) &&
!(txc->status & STA_PLL)) {
/* only set allowed bits */
time_status &= STA_RONLY;
time_status |= txc->status & ~STA_RONLY;
+
+ switch (time_state) {
+ case TIME_OK:
+ start_timer:
+ sec = ts.tv_sec;
+ if (time_status & STA_INS) {
+ time_state = TIME_INS;
+ sec += 86400 - sec % 86400;
+ hrtimer_start(&leap_timer, ktime_set(sec, 0), HRTIMER_MODE_ABS);
+ } else if (time_status & STA_DEL) {
+ time_state = TIME_DEL;
+ sec += 86400 - (sec + 1) % 86400;
+ hrtimer_start(&leap_timer, ktime_set(sec, 0), HRTIMER_MODE_ABS);
+ }
+ break;
+ case TIME_INS:
+ case TIME_DEL:
+ time_state = TIME_OK;
+ goto start_timer;
+ break;
+ case TIME_WAIT:
+ if (!(time_status & (STA_INS | STA_DEL)))
+ time_state = TIME_OK;
+ break;
+ case TIME_OOP:
+ hrtimer_restart(&leap_timer);
+ break;
+ }
}
if (txc->modes & ADJ_NANO)
time_status &= ~STA_NANO;
if (txc->modes & ADJ_FREQUENCY) {
- time_freq = min(txc->freq, MAXFREQ);
- time_freq = min(time_freq, -MAXFREQ);
- time_freq = ((s64)time_freq * NSEC_PER_USEC)
- >> (SHIFT_USEC - SHIFT_NSEC);
+ time_freq = (s64)txc->freq * PPM_SCALE;
+ time_freq = min(time_freq, MAXFREQ_SCALED);
+ time_freq = max(time_freq, -MAXFREQ_SCALED);
}
if (txc->modes & ADJ_MAXERROR)
time_constant = max(time_constant, 0l);
}
- if (txc->modes & ADJ_OFFSET) {
- if (txc->modes == ADJ_OFFSET_SINGLESHOT)
- /* adjtime() is independent from ntp_adjtime() */
- time_adjust = txc->offset;
- else
- ntp_update_offset(txc->offset);
- }
+ if (txc->modes & ADJ_TAI && txc->constant > 0)
+ time_tai = txc->constant;
+
+ if (txc->modes & ADJ_OFFSET)
+ ntp_update_offset(txc->offset);
if (txc->modes & ADJ_TICK)
tick_usec = txc->tick;
ntp_update_frequency();
}
+ txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
+ NTP_SCALE_SHIFT);
+ if (!(time_status & STA_NANO))
+ txc->offset /= NSEC_PER_USEC;
+
+adj_done:
result = time_state; /* mostly `TIME_OK' */
if (time_status & (STA_UNSYNC|STA_CLOCKERR))
result = TIME_ERROR;
- if ((txc->modes == ADJ_OFFSET_SINGLESHOT) ||
- (txc->modes == ADJ_OFFSET_SS_READ))
- txc->offset = save_adjust;
- else {
- txc->offset = ((long)shift_right(time_offset, SHIFT_UPDATE)) *
- NTP_INTERVAL_FREQ;
- if (!(time_status & STA_NANO))
- txc->offset /= NSEC_PER_USEC;
- }
- txc->freq = (time_freq / NSEC_PER_USEC) <<
- (SHIFT_USEC - SHIFT_NSEC);
+ txc->freq = shift_right((time_freq >> PPM_SCALE_INV_SHIFT) *
+ (s64)PPM_SCALE_INV, NTP_SCALE_SHIFT);
txc->maxerror = time_maxerror;
txc->esterror = time_esterror;
txc->status = time_status;
txc->constant = time_constant;
txc->precision = 1;
- txc->tolerance = MAXFREQ;
+ txc->tolerance = MAXFREQ_SCALED / PPM_SCALE;
txc->tick = tick_usec;
+ txc->tai = time_tai;
/* PPS is not implemented, so these are zero */
txc->ppsfreq = 0;
txc->stbcnt = 0;
write_sequnlock_irq(&xtime_lock);
- getnstimeofday(&ts);
txc->time.tv_sec = ts.tv_sec;
txc->time.tv_usec = ts.tv_nsec;
if (!(time_status & STA_NANO))
}
__setup("ntp_tick_adj=", ntp_tick_adj_setup);
+
+void __init ntp_init(void)
+{
+ ntp_clear();
+ hrtimer_init(&leap_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
+ leap_timer.function = ntp_leap_second;
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff