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-rw-r--r--kernel/time/alarmtimer.c17
-rw-r--r--kernel/time/clocksource.c4
-rw-r--r--kernel/time/ntp.c44
-rw-r--r--kernel/time/ntp_internal.h2
-rw-r--r--kernel/time/posix-clock.c4
-rw-r--r--kernel/time/tick-sched.c36
-rw-r--r--kernel/time/timekeeping.c49
-rw-r--r--kernel/time/timekeeping_internal.h8
8 files changed, 125 insertions, 39 deletions
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 7fbba635a549..e840ed867a5d 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -271,11 +271,27 @@ static int alarmtimer_suspend(struct device *dev)
__pm_wakeup_event(ws, MSEC_PER_SEC);
return ret;
}
+
+static int alarmtimer_resume(struct device *dev)
+{
+ struct rtc_device *rtc;
+
+ rtc = alarmtimer_get_rtcdev();
+ if (rtc)
+ rtc_timer_cancel(rtc, &rtctimer);
+ return 0;
+}
+
#else
static int alarmtimer_suspend(struct device *dev)
{
return 0;
}
+
+static int alarmtimer_resume(struct device *dev)
+{
+ return 0;
+}
#endif
static void alarmtimer_freezerset(ktime_t absexp, enum alarmtimer_type type)
@@ -800,6 +816,7 @@ out:
/* Suspend hook structures */
static const struct dev_pm_ops alarmtimer_pm_ops = {
.suspend = alarmtimer_suspend,
+ .resume = alarmtimer_resume,
};
static struct platform_driver alarmtimer_driver = {
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 1347882d131e..664de539299b 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -218,8 +218,8 @@ static void clocksource_watchdog(unsigned long data)
/* Check the deviation from the watchdog clocksource. */
if (abs(cs_nsec - wd_nsec) > WATCHDOG_THRESHOLD) {
- pr_warn("timekeeping watchdog: Marking clocksource '%s' as unstable because the skew is too large:\n",
- cs->name);
+ pr_warn("timekeeping watchdog on CPU%d: Marking clocksource '%s' as unstable because the skew is too large:\n",
+ smp_processor_id(), cs->name);
pr_warn(" '%s' wd_now: %llx wd_last: %llx mask: %llx\n",
watchdog->name, wdnow, wdlast, watchdog->mask);
pr_warn(" '%s' cs_now: %llx cs_last: %llx mask: %llx\n",
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 149cc8086aea..36f2ca09aa5e 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -16,8 +16,11 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/rtc.h>
+#include <linux/math64.h>
#include "ntp_internal.h"
+#include "timekeeping_internal.h"
+
/*
* NTP timekeeping variables:
@@ -70,7 +73,7 @@ static long time_esterror = NTP_PHASE_LIMIT;
static s64 time_freq;
/* time at last adjustment (secs): */
-static long time_reftime;
+static time64_t time_reftime;
static long time_adjust;
@@ -297,25 +300,27 @@ static void ntp_update_offset(long offset)
if (!(time_status & STA_PLL))
return;
- if (!(time_status & STA_NANO))
+ if (!(time_status & STA_NANO)) {
+ /* Make sure the multiplication below won't overflow */
+ offset = clamp(offset, -USEC_PER_SEC, USEC_PER_SEC);
offset *= NSEC_PER_USEC;
+ }
/*
* Scale the phase adjustment and
* clamp to the operating range.
*/
- offset = min(offset, MAXPHASE);
- offset = max(offset, -MAXPHASE);
+ offset = clamp(offset, -MAXPHASE, MAXPHASE);
/*
* Select how the frequency is to be controlled
* and in which mode (PLL or FLL).
*/
- secs = get_seconds() - time_reftime;
+ secs = (long)(__ktime_get_real_seconds() - time_reftime);
if (unlikely(time_status & STA_FREQHOLD))
secs = 0;
- time_reftime = get_seconds();
+ time_reftime = __ktime_get_real_seconds();
offset64 = offset;
freq_adj = ntp_update_offset_fll(offset64, secs);
@@ -390,10 +395,11 @@ ktime_t ntp_get_next_leap(void)
*
* Also handles leap second processing, and returns leap offset
*/
-int second_overflow(unsigned long secs)
+int second_overflow(time64_t secs)
{
s64 delta;
int leap = 0;
+ s32 rem;
/*
* Leap second processing. If in leap-insert state at the end of the
@@ -404,19 +410,19 @@ int second_overflow(unsigned long secs)
case TIME_OK:
if (time_status & STA_INS) {
time_state = TIME_INS;
- ntp_next_leap_sec = secs + SECS_PER_DAY -
- (secs % SECS_PER_DAY);
+ div_s64_rem(secs, SECS_PER_DAY, &rem);
+ ntp_next_leap_sec = secs + SECS_PER_DAY - rem;
} else if (time_status & STA_DEL) {
time_state = TIME_DEL;
- ntp_next_leap_sec = secs + SECS_PER_DAY -
- ((secs+1) % SECS_PER_DAY);
+ div_s64_rem(secs + 1, SECS_PER_DAY, &rem);
+ ntp_next_leap_sec = secs + SECS_PER_DAY - rem;
}
break;
case TIME_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 == ntp_next_leap_sec) {
leap = -1;
time_state = TIME_OOP;
printk(KERN_NOTICE
@@ -427,7 +433,7 @@ int second_overflow(unsigned long secs)
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 == ntp_next_leap_sec) {
leap = 1;
ntp_next_leap_sec = TIME64_MAX;
time_state = TIME_WAIT;
@@ -590,7 +596,7 @@ static inline void process_adj_status(struct timex *txc, struct timespec64 *ts)
* reference time to current time.
*/
if (!(time_status & STA_PLL) && (txc->status & STA_PLL))
- time_reftime = get_seconds();
+ time_reftime = __ktime_get_real_seconds();
/* only set allowed bits */
time_status &= STA_RONLY;
@@ -674,8 +680,14 @@ int ntp_validate_timex(struct timex *txc)
return -EINVAL;
}
- if ((txc->modes & ADJ_SETOFFSET) && (!capable(CAP_SYS_TIME)))
- return -EPERM;
+ if (txc->modes & ADJ_SETOFFSET) {
+ /* In order to inject time, you gotta be super-user! */
+ if (!capable(CAP_SYS_TIME))
+ return -EPERM;
+
+ if (!timeval_inject_offset_valid(&txc->time))
+ return -EINVAL;
+ }
/*
* Check for potential multiplication overflows that can
diff --git a/kernel/time/ntp_internal.h b/kernel/time/ntp_internal.h
index af924470eac0..d8a7c11fa71a 100644
--- a/kernel/time/ntp_internal.h
+++ b/kernel/time/ntp_internal.h
@@ -6,7 +6,7 @@ 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 second_overflow(time64_t secs);
extern int ntp_validate_timex(struct timex *);
extern int __do_adjtimex(struct timex *, struct timespec64 *, s32 *);
extern void __hardpps(const struct timespec64 *, const struct timespec64 *);
diff --git a/kernel/time/posix-clock.c b/kernel/time/posix-clock.c
index ce033c7aa2e8..9cff0ab82b63 100644
--- a/kernel/time/posix-clock.c
+++ b/kernel/time/posix-clock.c
@@ -69,10 +69,10 @@ static ssize_t posix_clock_read(struct file *fp, char __user *buf,
static unsigned int posix_clock_poll(struct file *fp, poll_table *wait)
{
struct posix_clock *clk = get_posix_clock(fp);
- int result = 0;
+ unsigned int result = 0;
if (!clk)
- return -ENODEV;
+ return POLLERR;
if (clk->ops.poll)
result = clk->ops.poll(clk, fp, wait);
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 7c7ec4515983..9cc20af58c76 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -143,7 +143,7 @@ static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)
* when we go busy again does not account too much ticks.
*/
if (ts->tick_stopped) {
- touch_softlockup_watchdog();
+ touch_softlockup_watchdog_sched();
if (is_idle_task(current))
ts->idle_jiffies++;
}
@@ -430,7 +430,7 @@ static void tick_nohz_update_jiffies(ktime_t now)
tick_do_update_jiffies64(now);
local_irq_restore(flags);
- touch_softlockup_watchdog();
+ touch_softlockup_watchdog_sched();
}
/*
@@ -603,15 +603,31 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
/*
* If the tick is due in the next period, keep it ticking or
- * restart it proper.
+ * force prod the timer.
*/
delta = next_tick - basemono;
if (delta <= (u64)TICK_NSEC) {
tick.tv64 = 0;
+ /*
+ * We've not stopped the tick yet, and there's a timer in the
+ * next period, so no point in stopping it either, bail.
+ */
if (!ts->tick_stopped)
goto out;
+
+ /*
+ * If, OTOH, we did stop it, but there's a pending (expired)
+ * timer reprogram the timer hardware to fire now.
+ *
+ * We will not restart the tick proper, just prod the timer
+ * hardware into firing an interrupt to process the pending
+ * timers. Just like tick_irq_exit() will not restart the tick
+ * for 'normal' interrupts.
+ *
+ * Only once we exit the idle loop will we re-enable the tick,
+ * see tick_nohz_idle_exit().
+ */
if (delta == 0) {
- /* Tick is stopped, but required now. Enforce it */
tick_nohz_restart(ts, now);
goto out;
}
@@ -694,14 +710,14 @@ out:
return tick;
}
-static void tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now)
+static void tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now, int active)
{
/* Update jiffies first */
tick_do_update_jiffies64(now);
- update_cpu_load_nohz();
+ update_cpu_load_nohz(active);
calc_load_exit_idle();
- touch_softlockup_watchdog();
+ touch_softlockup_watchdog_sched();
/*
* Cancel the scheduled timer and restore the tick
*/
@@ -725,7 +741,7 @@ static void tick_nohz_full_update_tick(struct tick_sched *ts)
if (can_stop_full_tick())
tick_nohz_stop_sched_tick(ts, ktime_get(), cpu);
else if (ts->tick_stopped)
- tick_nohz_restart_sched_tick(ts, ktime_get());
+ tick_nohz_restart_sched_tick(ts, ktime_get(), 1);
#endif
}
@@ -875,7 +891,7 @@ static void tick_nohz_account_idle_ticks(struct tick_sched *ts)
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
unsigned long ticks;
- if (vtime_accounting_enabled())
+ if (vtime_accounting_cpu_enabled())
return;
/*
* We stopped the tick in idle. Update process times would miss the
@@ -916,7 +932,7 @@ void tick_nohz_idle_exit(void)
tick_nohz_stop_idle(ts, now);
if (ts->tick_stopped) {
- tick_nohz_restart_sched_tick(ts, now);
+ tick_nohz_restart_sched_tick(ts, now, 0);
tick_nohz_account_idle_ticks(ts);
}
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index d563c1960302..34b4cedfa80d 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -305,8 +305,7 @@ static inline s64 timekeeping_get_ns(struct tk_read_base *tkr)
delta = timekeeping_get_delta(tkr);
- nsec = delta * tkr->mult + tkr->xtime_nsec;
- nsec >>= tkr->shift;
+ nsec = (delta * tkr->mult + tkr->xtime_nsec) >> tkr->shift;
/* If arch requires, add in get_arch_timeoffset() */
return nsec + arch_gettimeoffset();
@@ -846,6 +845,19 @@ time64_t ktime_get_real_seconds(void)
}
EXPORT_SYMBOL_GPL(ktime_get_real_seconds);
+/**
+ * __ktime_get_real_seconds - The same as ktime_get_real_seconds
+ * but without the sequence counter protect. This internal function
+ * is called just when timekeeping lock is already held.
+ */
+time64_t __ktime_get_real_seconds(void)
+{
+ struct timekeeper *tk = &tk_core.timekeeper;
+
+ return tk->xtime_sec;
+}
+
+
#ifdef CONFIG_NTP_PPS
/**
@@ -959,7 +971,7 @@ int timekeeping_inject_offset(struct timespec *ts)
struct timespec64 ts64, tmp;
int ret = 0;
- if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
+ if (!timespec_inject_offset_valid(ts))
return -EINVAL;
ts64 = timespec_to_timespec64(*ts);
@@ -1592,9 +1604,12 @@ static __always_inline void timekeeping_freqadjust(struct timekeeper *tk,
{
s64 interval = tk->cycle_interval;
s64 xinterval = tk->xtime_interval;
+ u32 base = tk->tkr_mono.clock->mult;
+ u32 max = tk->tkr_mono.clock->maxadj;
+ u32 cur_adj = tk->tkr_mono.mult;
s64 tick_error;
bool negative;
- u32 adj;
+ u32 adj_scale;
/* Remove any current error adj from freq calculation */
if (tk->ntp_err_mult)
@@ -1613,13 +1628,33 @@ static __always_inline void timekeeping_freqadjust(struct timekeeper *tk,
/* preserve the direction of correction */
negative = (tick_error < 0);
- /* Sort out the magnitude of the correction */
+ /* If any adjustment would pass the max, just return */
+ if (negative && (cur_adj - 1) <= (base - max))
+ return;
+ if (!negative && (cur_adj + 1) >= (base + max))
+ return;
+ /*
+ * Sort out the magnitude of the correction, but
+ * avoid making so large a correction that we go
+ * over the max adjustment.
+ */
+ adj_scale = 0;
tick_error = abs(tick_error);
- for (adj = 0; tick_error > interval; adj++)
+ while (tick_error > interval) {
+ u32 adj = 1 << (adj_scale + 1);
+
+ /* Check if adjustment gets us within 1 unit from the max */
+ if (negative && (cur_adj - adj) <= (base - max))
+ break;
+ if (!negative && (cur_adj + adj) >= (base + max))
+ break;
+
+ adj_scale++;
tick_error >>= 1;
+ }
/* scale the corrections */
- timekeeping_apply_adjustment(tk, offset, negative, adj);
+ timekeeping_apply_adjustment(tk, offset, negative, adj_scale);
}
/*
diff --git a/kernel/time/timekeeping_internal.h b/kernel/time/timekeeping_internal.h
index 4ea005a7f9da..5be76270ec4a 100644
--- a/kernel/time/timekeeping_internal.h
+++ b/kernel/time/timekeeping_internal.h
@@ -17,7 +17,11 @@ static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
{
cycle_t ret = (now - last) & mask;
- return (s64) ret > 0 ? ret : 0;
+ /*
+ * Prevent time going backwards by checking the MSB of mask in
+ * the result. If set, return 0.
+ */
+ return ret & ~(mask >> 1) ? 0 : ret;
}
#else
static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
@@ -26,4 +30,6 @@ static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
}
#endif
+extern time64_t __ktime_get_real_seconds(void);
+
#endif /* _TIMEKEEPING_INTERNAL_H */
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-27 12:21:07 +0300