aboutsummaryrefslogtreecommitdiff
path: root/kernel/time/timekeeping.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/time/timekeeping.c')
-rw-r--r--kernel/time/timekeeping.c396
1 files changed, 315 insertions, 81 deletions
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 9a0bc98fbe1..98cd470bbe4 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -23,8 +23,13 @@
#include <linux/stop_machine.h>
#include <linux/pvclock_gtod.h>
+#include "tick-internal.h"
+#include "ntp_internal.h"
static struct timekeeper timekeeper;
+static DEFINE_RAW_SPINLOCK(timekeeper_lock);
+static seqcount_t timekeeper_seq;
+static struct timekeeper shadow_timekeeper;
/* flag for if timekeeping is suspended */
int __read_mostly timekeeping_suspended;
@@ -67,6 +72,7 @@ static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec wtm)
tk->wall_to_monotonic = wtm;
set_normalized_timespec(&tmp, -wtm.tv_sec, -wtm.tv_nsec);
tk->offs_real = timespec_to_ktime(tmp);
+ tk->offs_tai = ktime_sub(tk->offs_real, ktime_set(tk->tai_offset, 0));
}
static void tk_set_sleep_time(struct timekeeper *tk, struct timespec t)
@@ -96,7 +102,7 @@ static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock)
old_clock = tk->clock;
tk->clock = clock;
- clock->cycle_last = clock->read(clock);
+ tk->cycle_last = clock->cycle_last = clock->read(clock);
/* Do the ns -> cycle conversion first, using original mult */
tmp = NTP_INTERVAL_LENGTH;
@@ -201,8 +207,6 @@ static void update_pvclock_gtod(struct timekeeper *tk)
/**
* pvclock_gtod_register_notifier - register a pvclock timedata update listener
- *
- * Must hold write on timekeeper.lock
*/
int pvclock_gtod_register_notifier(struct notifier_block *nb)
{
@@ -210,11 +214,10 @@ int pvclock_gtod_register_notifier(struct notifier_block *nb)
unsigned long flags;
int ret;
- write_seqlock_irqsave(&tk->lock, flags);
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb);
- /* update timekeeping data */
update_pvclock_gtod(tk);
- write_sequnlock_irqrestore(&tk->lock, flags);
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
return ret;
}
@@ -223,25 +226,22 @@ EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier);
/**
* pvclock_gtod_unregister_notifier - unregister a pvclock
* timedata update listener
- *
- * Must hold write on timekeeper.lock
*/
int pvclock_gtod_unregister_notifier(struct notifier_block *nb)
{
- struct timekeeper *tk = &timekeeper;
unsigned long flags;
int ret;
- write_seqlock_irqsave(&tk->lock, flags);
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb);
- write_sequnlock_irqrestore(&tk->lock, flags);
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier);
-/* must hold write on timekeeper.lock */
-static void timekeeping_update(struct timekeeper *tk, bool clearntp)
+/* must hold timekeeper_lock */
+static void timekeeping_update(struct timekeeper *tk, bool clearntp, bool mirror)
{
if (clearntp) {
tk->ntp_error = 0;
@@ -249,6 +249,9 @@ static void timekeeping_update(struct timekeeper *tk, bool clearntp)
}
update_vsyscall(tk);
update_pvclock_gtod(tk);
+
+ if (mirror)
+ memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper));
}
/**
@@ -267,7 +270,7 @@ static void timekeeping_forward_now(struct timekeeper *tk)
clock = tk->clock;
cycle_now = clock->read(clock);
cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
- clock->cycle_last = cycle_now;
+ tk->cycle_last = clock->cycle_last = cycle_now;
tk->xtime_nsec += cycle_delta * tk->mult;
@@ -294,12 +297,12 @@ int __getnstimeofday(struct timespec *ts)
s64 nsecs = 0;
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
ts->tv_sec = tk->xtime_sec;
nsecs = timekeeping_get_ns(tk);
- } while (read_seqretry(&tk->lock, seq));
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
ts->tv_nsec = 0;
timespec_add_ns(ts, nsecs);
@@ -335,11 +338,11 @@ ktime_t ktime_get(void)
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
secs = tk->xtime_sec + tk->wall_to_monotonic.tv_sec;
nsecs = timekeeping_get_ns(tk) + tk->wall_to_monotonic.tv_nsec;
- } while (read_seqretry(&tk->lock, seq));
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
/*
* Use ktime_set/ktime_add_ns to create a proper ktime on
* 32-bit architectures without CONFIG_KTIME_SCALAR.
@@ -366,12 +369,12 @@ void ktime_get_ts(struct timespec *ts)
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
ts->tv_sec = tk->xtime_sec;
nsec = timekeeping_get_ns(tk);
tomono = tk->wall_to_monotonic;
- } while (read_seqretry(&tk->lock, seq));
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
ts->tv_sec += tomono.tv_sec;
ts->tv_nsec = 0;
@@ -379,6 +382,50 @@ void ktime_get_ts(struct timespec *ts)
}
EXPORT_SYMBOL_GPL(ktime_get_ts);
+
+/**
+ * timekeeping_clocktai - Returns the TAI time of day in a timespec
+ * @ts: pointer to the timespec to be set
+ *
+ * Returns the time of day in a timespec.
+ */
+void timekeeping_clocktai(struct timespec *ts)
+{
+ struct timekeeper *tk = &timekeeper;
+ unsigned long seq;
+ u64 nsecs;
+
+ WARN_ON(timekeeping_suspended);
+
+ do {
+ seq = read_seqcount_begin(&timekeeper_seq);
+
+ ts->tv_sec = tk->xtime_sec + tk->tai_offset;
+ nsecs = timekeeping_get_ns(tk);
+
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
+
+ ts->tv_nsec = 0;
+ timespec_add_ns(ts, nsecs);
+
+}
+EXPORT_SYMBOL(timekeeping_clocktai);
+
+
+/**
+ * ktime_get_clocktai - Returns the TAI time of day in a ktime
+ *
+ * Returns the time of day in a ktime.
+ */
+ktime_t ktime_get_clocktai(void)
+{
+ struct timespec ts;
+
+ timekeeping_clocktai(&ts);
+ return timespec_to_ktime(ts);
+}
+EXPORT_SYMBOL(ktime_get_clocktai);
+
#ifdef CONFIG_NTP_PPS
/**
@@ -399,7 +446,7 @@ void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
WARN_ON_ONCE(timekeeping_suspended);
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
*ts_raw = tk->raw_time;
ts_real->tv_sec = tk->xtime_sec;
@@ -408,7 +455,7 @@ void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
nsecs_raw = timekeeping_get_ns_raw(tk);
nsecs_real = timekeeping_get_ns(tk);
- } while (read_seqretry(&tk->lock, seq));
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
timespec_add_ns(ts_raw, nsecs_raw);
timespec_add_ns(ts_real, nsecs_real);
@@ -448,7 +495,8 @@ int do_settimeofday(const struct timespec *tv)
if (!timespec_valid_strict(tv))
return -EINVAL;
- write_seqlock_irqsave(&tk->lock, flags);
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
+ write_seqcount_begin(&timekeeper_seq);
timekeeping_forward_now(tk);
@@ -460,9 +508,10 @@ int do_settimeofday(const struct timespec *tv)
tk_set_xtime(tk, tv);
- timekeeping_update(tk, true);
+ timekeeping_update(tk, true, true);
- write_sequnlock_irqrestore(&tk->lock, flags);
+ write_seqcount_end(&timekeeper_seq);
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
/* signal hrtimers about time change */
clock_was_set();
@@ -487,7 +536,8 @@ int timekeeping_inject_offset(struct timespec *ts)
if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
- write_seqlock_irqsave(&tk->lock, flags);
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
+ write_seqcount_begin(&timekeeper_seq);
timekeeping_forward_now(tk);
@@ -502,9 +552,10 @@ int timekeeping_inject_offset(struct timespec *ts)
tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *ts));
error: /* even if we error out, we forwarded the time, so call update */
- timekeeping_update(tk, true);
+ timekeeping_update(tk, true, true);
- write_sequnlock_irqrestore(&tk->lock, flags);
+ write_seqcount_end(&timekeeper_seq);
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
/* signal hrtimers about time change */
clock_was_set();
@@ -513,6 +564,52 @@ error: /* even if we error out, we forwarded the time, so call update */
}
EXPORT_SYMBOL(timekeeping_inject_offset);
+
+/**
+ * timekeeping_get_tai_offset - Returns current TAI offset from UTC
+ *
+ */
+s32 timekeeping_get_tai_offset(void)
+{
+ struct timekeeper *tk = &timekeeper;
+ unsigned int seq;
+ s32 ret;
+
+ do {
+ seq = read_seqcount_begin(&timekeeper_seq);
+ ret = tk->tai_offset;
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
+
+ return ret;
+}
+
+/**
+ * __timekeeping_set_tai_offset - Lock free worker function
+ *
+ */
+static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset)
+{
+ tk->tai_offset = tai_offset;
+ tk->offs_tai = ktime_sub(tk->offs_real, ktime_set(tai_offset, 0));
+}
+
+/**
+ * timekeeping_set_tai_offset - Sets the current TAI offset from UTC
+ *
+ */
+void timekeeping_set_tai_offset(s32 tai_offset)
+{
+ struct timekeeper *tk = &timekeeper;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
+ write_seqcount_begin(&timekeeper_seq);
+ __timekeeping_set_tai_offset(tk, tai_offset);
+ write_seqcount_end(&timekeeper_seq);
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
+ clock_was_set();
+}
+
/**
* change_clocksource - Swaps clocksources if a new one is available
*
@@ -526,7 +623,8 @@ static int change_clocksource(void *data)
new = (struct clocksource *) data;
- write_seqlock_irqsave(&tk->lock, flags);
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
+ write_seqcount_begin(&timekeeper_seq);
timekeeping_forward_now(tk);
if (!new->enable || new->enable(new) == 0) {
@@ -535,9 +633,10 @@ static int change_clocksource(void *data)
if (old->disable)
old->disable(old);
}
- timekeeping_update(tk, true);
+ timekeeping_update(tk, true, true);
- write_sequnlock_irqrestore(&tk->lock, flags);
+ write_seqcount_end(&timekeeper_seq);
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
return 0;
}
@@ -587,11 +686,11 @@ void getrawmonotonic(struct timespec *ts)
s64 nsecs;
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
nsecs = timekeeping_get_ns_raw(tk);
*ts = tk->raw_time;
- } while (read_seqretry(&tk->lock, seq));
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
timespec_add_ns(ts, nsecs);
}
@@ -607,11 +706,11 @@ int timekeeping_valid_for_hres(void)
int ret;
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
ret = tk->clock->flags & CLOCK_SOURCE_VALID_FOR_HRES;
- } while (read_seqretry(&tk->lock, seq));
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
return ret;
}
@@ -626,11 +725,11 @@ u64 timekeeping_max_deferment(void)
u64 ret;
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
ret = tk->clock->max_idle_ns;
- } while (read_seqretry(&tk->lock, seq));
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
return ret;
}
@@ -693,11 +792,10 @@ void __init timekeeping_init(void)
boot.tv_nsec = 0;
}
- seqlock_init(&tk->lock);
-
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
+ write_seqcount_begin(&timekeeper_seq);
ntp_init();
- write_seqlock_irqsave(&tk->lock, flags);
clock = clocksource_default_clock();
if (clock->enable)
clock->enable(clock);
@@ -716,7 +814,10 @@ void __init timekeeping_init(void)
tmp.tv_nsec = 0;
tk_set_sleep_time(tk, tmp);
- write_sequnlock_irqrestore(&tk->lock, flags);
+ memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper));
+
+ write_seqcount_end(&timekeeper_seq);
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
}
/* time in seconds when suspend began */
@@ -764,15 +865,17 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
if (has_persistent_clock())
return;
- write_seqlock_irqsave(&tk->lock, flags);
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
+ write_seqcount_begin(&timekeeper_seq);
timekeeping_forward_now(tk);
__timekeeping_inject_sleeptime(tk, delta);
- timekeeping_update(tk, true);
+ timekeeping_update(tk, true, true);
- write_sequnlock_irqrestore(&tk->lock, flags);
+ write_seqcount_end(&timekeeper_seq);
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
/* signal hrtimers about time change */
clock_was_set();
@@ -788,26 +891,72 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
static void timekeeping_resume(void)
{
struct timekeeper *tk = &timekeeper;
+ struct clocksource *clock = tk->clock;
unsigned long flags;
- struct timespec ts;
+ struct timespec ts_new, ts_delta;
+ cycle_t cycle_now, cycle_delta;
+ bool suspendtime_found = false;
- read_persistent_clock(&ts);
+ read_persistent_clock(&ts_new);
clockevents_resume();
clocksource_resume();
- write_seqlock_irqsave(&tk->lock, flags);
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
+ write_seqcount_begin(&timekeeper_seq);
+
+ /*
+ * After system resumes, we need to calculate the suspended time and
+ * compensate it for the OS time. There are 3 sources that could be
+ * used: Nonstop clocksource during suspend, persistent clock and rtc
+ * device.
+ *
+ * One specific platform may have 1 or 2 or all of them, and the
+ * preference will be:
+ * suspend-nonstop clocksource -> persistent clock -> rtc
+ * The less preferred source will only be tried if there is no better
+ * usable source. The rtc part is handled separately in rtc core code.
+ */
+ cycle_now = clock->read(clock);
+ if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) &&
+ cycle_now > clock->cycle_last) {
+ u64 num, max = ULLONG_MAX;
+ u32 mult = clock->mult;
+ u32 shift = clock->shift;
+ s64 nsec = 0;
+
+ cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
- if (timespec_compare(&ts, &timekeeping_suspend_time) > 0) {
- ts = timespec_sub(ts, timekeeping_suspend_time);
- __timekeeping_inject_sleeptime(tk, &ts);
+ /*
+ * "cycle_delta * mutl" may cause 64 bits overflow, if the
+ * suspended time is too long. In that case we need do the
+ * 64 bits math carefully
+ */
+ do_div(max, mult);
+ if (cycle_delta > max) {
+ num = div64_u64(cycle_delta, max);
+ nsec = (((u64) max * mult) >> shift) * num;
+ cycle_delta -= num * max;
+ }
+ nsec += ((u64) cycle_delta * mult) >> shift;
+
+ ts_delta = ns_to_timespec(nsec);
+ suspendtime_found = true;
+ } else if (timespec_compare(&ts_new, &timekeeping_suspend_time) > 0) {
+ ts_delta = timespec_sub(ts_new, timekeeping_suspend_time);
+ suspendtime_found = true;
}
- /* re-base the last cycle value */
- tk->clock->cycle_last = tk->clock->read(tk->clock);
+
+ if (suspendtime_found)
+ __timekeeping_inject_sleeptime(tk, &ts_delta);
+
+ /* Re-base the last cycle value */
+ tk->cycle_last = clock->cycle_last = cycle_now;
tk->ntp_error = 0;
timekeeping_suspended = 0;
- timekeeping_update(tk, false);
- write_sequnlock_irqrestore(&tk->lock, flags);
+ timekeeping_update(tk, false, true);
+ write_seqcount_end(&timekeeper_seq);
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
touch_softlockup_watchdog();
@@ -826,7 +975,8 @@ static int timekeeping_suspend(void)
read_persistent_clock(&timekeeping_suspend_time);
- write_seqlock_irqsave(&tk->lock, flags);
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
+ write_seqcount_begin(&timekeeper_seq);
timekeeping_forward_now(tk);
timekeeping_suspended = 1;
@@ -849,7 +999,8 @@ static int timekeeping_suspend(void)
timekeeping_suspend_time =
timespec_add(timekeeping_suspend_time, delta_delta);
}
- write_sequnlock_irqrestore(&tk->lock, flags);
+ write_seqcount_end(&timekeeper_seq);
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL);
clocksource_suspend();
@@ -1099,6 +1250,8 @@ static inline void accumulate_nsecs_to_secs(struct timekeeper *tk)
tk_set_wall_to_mono(tk,
timespec_sub(tk->wall_to_monotonic, ts));
+ __timekeeping_set_tai_offset(tk, tk->tai_offset - leap);
+
clock_was_set_delayed();
}
}
@@ -1116,15 +1269,16 @@ static inline void accumulate_nsecs_to_secs(struct timekeeper *tk)
static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
u32 shift)
{
+ cycle_t interval = tk->cycle_interval << shift;
u64 raw_nsecs;
/* If the offset is smaller then a shifted interval, do nothing */
- if (offset < tk->cycle_interval<<shift)
+ if (offset < interval)
return offset;
/* Accumulate one shifted interval */
- offset -= tk->cycle_interval << shift;
- tk->clock->cycle_last += tk->cycle_interval << shift;
+ offset -= interval;
+ tk->cycle_last += interval;
tk->xtime_nsec += tk->xtime_interval << shift;
accumulate_nsecs_to_secs(tk);
@@ -1181,27 +1335,28 @@ static inline void old_vsyscall_fixup(struct timekeeper *tk)
static void update_wall_time(void)
{
struct clocksource *clock;
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *real_tk = &timekeeper;
+ struct timekeeper *tk = &shadow_timekeeper;
cycle_t offset;
int shift = 0, maxshift;
unsigned long flags;
- write_seqlock_irqsave(&tk->lock, flags);
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
/* Make sure we're fully resumed: */
if (unlikely(timekeeping_suspended))
goto out;
- clock = tk->clock;
+ clock = real_tk->clock;
#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
- offset = tk->cycle_interval;
+ offset = real_tk->cycle_interval;
#else
offset = (clock->read(clock) - clock->cycle_last) & clock->mask;
#endif
/* Check if there's really nothing to do */
- if (offset < tk->cycle_interval)
+ if (offset < real_tk->cycle_interval)
goto out;
/*
@@ -1238,11 +1393,24 @@ static void update_wall_time(void)
*/
accumulate_nsecs_to_secs(tk);
- timekeeping_update(tk, false);
-
+ write_seqcount_begin(&timekeeper_seq);
+ /* Update clock->cycle_last with the new value */
+ clock->cycle_last = tk->cycle_last;
+ /*
+ * Update the real timekeeper.
+ *
+ * We could avoid this memcpy by switching pointers, but that
+ * requires changes to all other timekeeper usage sites as
+ * well, i.e. move the timekeeper pointer getter into the
+ * spinlocked/seqcount protected sections. And we trade this
+ * memcpy under the timekeeper_seq against one before we start
+ * updating.
+ */
+ memcpy(real_tk, tk, sizeof(*tk));
+ timekeeping_update(real_tk, false, false);
+ write_seqcount_end(&timekeeper_seq);
out:
- write_sequnlock_irqrestore(&tk->lock, flags);
-
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
}
/**
@@ -1289,13 +1457,13 @@ void get_monotonic_boottime(struct timespec *ts)
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
ts->tv_sec = tk->xtime_sec;
nsec = timekeeping_get_ns(tk);
tomono = tk->wall_to_monotonic;
sleep = tk->total_sleep_time;
- } while (read_seqretry(&tk->lock, seq));
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
ts->tv_sec += tomono.tv_sec + sleep.tv_sec;
ts->tv_nsec = 0;
@@ -1354,10 +1522,10 @@ struct timespec current_kernel_time(void)
unsigned long seq;
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
now = tk_xtime(tk);
- } while (read_seqretry(&tk->lock, seq));
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
return now;
}
@@ -1370,11 +1538,11 @@ struct timespec get_monotonic_coarse(void)
unsigned long seq;
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
now = tk_xtime(tk);
mono = tk->wall_to_monotonic;
- } while (read_seqretry(&tk->lock, seq));
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
set_normalized_timespec(&now, now.tv_sec + mono.tv_sec,
now.tv_nsec + mono.tv_nsec);
@@ -1405,11 +1573,11 @@ void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
unsigned long seq;
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
*xtim = tk_xtime(tk);
*wtom = tk->wall_to_monotonic;
*sleep = tk->total_sleep_time;
- } while (read_seqretry(&tk->lock, seq));
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
}
#ifdef CONFIG_HIGH_RES_TIMERS
@@ -1421,7 +1589,8 @@ void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
* Returns current monotonic time and updates the offsets
* Called from hrtimer_interupt() or retrigger_next_event()
*/
-ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot)
+ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot,
+ ktime_t *offs_tai)
{
struct timekeeper *tk = &timekeeper;
ktime_t now;
@@ -1429,14 +1598,15 @@ ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot)
u64 secs, nsecs;
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
secs = tk->xtime_sec;
nsecs = timekeeping_get_ns(tk);
*offs_real = tk->offs_real;
*offs_boot = tk->offs_boot;
- } while (read_seqretry(&tk->lock, seq));
+ *offs_tai = tk->offs_tai;
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
now = ktime_add_ns(ktime_set(secs, 0), nsecs);
now = ktime_sub(now, *offs_real);
@@ -1454,15 +1624,79 @@ ktime_t ktime_get_monotonic_offset(void)
struct timespec wtom;
do {
- seq = read_seqbegin(&tk->lock);
+ seq = read_seqcount_begin(&timekeeper_seq);
wtom = tk->wall_to_monotonic;
- } while (read_seqretry(&tk->lock, seq));
+ } while (read_seqcount_retry(&timekeeper_seq, seq));
return timespec_to_ktime(wtom);
}
EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset);
/**
+ * do_adjtimex() - Accessor function to NTP __do_adjtimex function
+ */
+int do_adjtimex(struct timex *txc)
+{
+ struct timekeeper *tk = &timekeeper;
+ unsigned long flags;
+ struct timespec ts;
+ s32 orig_tai, tai;
+ int ret;
+
+ /* Validate the data before disabling interrupts */
+ ret = ntp_validate_timex(txc);
+ if (ret)
+ return ret;
+
+ if (txc->modes & ADJ_SETOFFSET) {
+ struct timespec delta;
+ delta.tv_sec = txc->time.tv_sec;
+ delta.tv_nsec = txc->time.tv_usec;
+ if (!(txc->modes & ADJ_NANO))
+ delta.tv_nsec *= 1000;
+ ret = timekeeping_inject_offset(&delta);
+ if (ret)
+ return ret;
+ }
+
+ getnstimeofday(&ts);
+
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
+ write_seqcount_begin(&timekeeper_seq);
+
+ orig_tai = tai = tk->tai_offset;
+ ret = __do_adjtimex(txc, &ts, &tai);
+
+ if (tai != orig_tai) {
+ __timekeeping_set_tai_offset(tk, tai);
+ clock_was_set_delayed();
+ }
+ write_seqcount_end(&timekeeper_seq);
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
+
+ return ret;
+}
+
+#ifdef CONFIG_NTP_PPS
+/**
+ * hardpps() - Accessor function to NTP __hardpps function
+ */
+void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
+{
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&timekeeper_lock, flags);
+ write_seqcount_begin(&timekeeper_seq);
+
+ __hardpps(phase_ts, raw_ts);
+
+ write_seqcount_end(&timekeeper_seq);
+ raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
+}
+EXPORT_SYMBOL(hardpps);
+#endif
+
+/**
* xtime_update() - advances the timekeeping infrastructure
* @ticks: number of ticks, that have elapsed since the last call.
*
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-28 11:06:20 +0000