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-rw-r--r--kernel/time/timekeeping.c208
1 files changed, 103 insertions, 105 deletions
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index aeeaab8cba6..5980e902978 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -127,14 +127,14 @@ static void tk_xtime_add(struct timekeeper *tk, const struct timespec *ts)
*
* Unless you're the timekeeping code, you should not be using this!
*/
-static void timekeeper_setup_internals(struct clocksource *clock)
+static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock)
{
cycle_t interval;
u64 tmp, ntpinterval;
struct clocksource *old_clock;
- old_clock = timekeeper.clock;
- timekeeper.clock = clock;
+ old_clock = tk->clock;
+ tk->clock = clock;
clock->cycle_last = clock->read(clock);
/* Do the ns -> cycle conversion first, using original mult */
@@ -147,64 +147,64 @@ static void timekeeper_setup_internals(struct clocksource *clock)
tmp = 1;
interval = (cycle_t) tmp;
- timekeeper.cycle_interval = interval;
+ tk->cycle_interval = interval;
/* Go back from cycles -> shifted ns */
- timekeeper.xtime_interval = (u64) interval * clock->mult;
- timekeeper.xtime_remainder = ntpinterval - timekeeper.xtime_interval;
- timekeeper.raw_interval =
+ tk->xtime_interval = (u64) interval * clock->mult;
+ tk->xtime_remainder = ntpinterval - tk->xtime_interval;
+ tk->raw_interval =
((u64) interval * clock->mult) >> clock->shift;
/* if changing clocks, convert xtime_nsec shift units */
if (old_clock) {
int shift_change = clock->shift - old_clock->shift;
if (shift_change < 0)
- timekeeper.xtime_nsec >>= -shift_change;
+ tk->xtime_nsec >>= -shift_change;
else
- timekeeper.xtime_nsec <<= shift_change;
+ tk->xtime_nsec <<= shift_change;
}
- timekeeper.shift = clock->shift;
+ tk->shift = clock->shift;
- timekeeper.ntp_error = 0;
- timekeeper.ntp_error_shift = NTP_SCALE_SHIFT - clock->shift;
+ tk->ntp_error = 0;
+ tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift;
/*
* The timekeeper keeps its own mult values for the currently
* active clocksource. These value will be adjusted via NTP
* to counteract clock drifting.
*/
- timekeeper.mult = clock->mult;
+ tk->mult = clock->mult;
}
/* Timekeeper helper functions. */
-static inline s64 timekeeping_get_ns(void)
+static inline s64 timekeeping_get_ns(struct timekeeper *tk)
{
cycle_t cycle_now, cycle_delta;
struct clocksource *clock;
s64 nsec;
/* read clocksource: */
- clock = timekeeper.clock;
+ clock = tk->clock;
cycle_now = clock->read(clock);
/* calculate the delta since the last update_wall_time: */
cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
- nsec = cycle_delta * timekeeper.mult + timekeeper.xtime_nsec;
- nsec >>= timekeeper.shift;
+ nsec = cycle_delta * tk->mult + tk->xtime_nsec;
+ nsec >>= tk->shift;
/* If arch requires, add in gettimeoffset() */
return nsec + arch_gettimeoffset();
}
-static inline s64 timekeeping_get_ns_raw(void)
+static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk)
{
cycle_t cycle_now, cycle_delta;
struct clocksource *clock;
s64 nsec;
/* read clocksource: */
- clock = timekeeper.clock;
+ clock = tk->clock;
cycle_now = clock->read(clock);
/* calculate the delta since the last update_wall_time: */
@@ -217,27 +217,26 @@ static inline s64 timekeeping_get_ns_raw(void)
return nsec + arch_gettimeoffset();
}
-static void update_rt_offset(void)
+static void update_rt_offset(struct timekeeper *tk)
{
- struct timespec tmp, *wtm = &timekeeper.wall_to_monotonic;
+ struct timespec tmp, *wtm = &tk->wall_to_monotonic;
set_normalized_timespec(&tmp, -wtm->tv_sec, -wtm->tv_nsec);
- timekeeper.offs_real = timespec_to_ktime(tmp);
+ tk->offs_real = timespec_to_ktime(tmp);
}
/* must hold write on timekeeper.lock */
-static void timekeeping_update(bool clearntp)
+static void timekeeping_update(struct timekeeper *tk, bool clearntp)
{
struct timespec xt;
if (clearntp) {
- timekeeper.ntp_error = 0;
+ tk->ntp_error = 0;
ntp_clear();
}
- update_rt_offset();
- xt = tk_xtime(&timekeeper);
- update_vsyscall(&xt, &timekeeper.wall_to_monotonic,
- timekeeper.clock, timekeeper.mult);
+ update_rt_offset(tk);
+ xt = tk_xtime(tk);
+ update_vsyscall(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult);
}
@@ -248,26 +247,26 @@ static void timekeeping_update(bool clearntp)
* update_wall_time(). This is useful before significant clock changes,
* as it avoids having to deal with this time offset explicitly.
*/
-static void timekeeping_forward_now(void)
+static void timekeeping_forward_now(struct timekeeper *tk)
{
cycle_t cycle_now, cycle_delta;
struct clocksource *clock;
s64 nsec;
- clock = timekeeper.clock;
+ clock = tk->clock;
cycle_now = clock->read(clock);
cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
clock->cycle_last = cycle_now;
- timekeeper.xtime_nsec += cycle_delta * timekeeper.mult;
+ tk->xtime_nsec += cycle_delta * tk->mult;
/* If arch requires, add in gettimeoffset() */
- timekeeper.xtime_nsec += arch_gettimeoffset() << timekeeper.shift;
+ tk->xtime_nsec += arch_gettimeoffset() << tk->shift;
- tk_normalize_xtime(&timekeeper);
+ tk_normalize_xtime(tk);
nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift);
- timespec_add_ns(&timekeeper.raw_time, nsec);
+ timespec_add_ns(&tk->raw_time, nsec);
}
/**
@@ -287,7 +286,7 @@ void getnstimeofday(struct timespec *ts)
seq = read_seqbegin(&timekeeper.lock);
ts->tv_sec = timekeeper.xtime_sec;
- ts->tv_nsec = timekeeping_get_ns();
+ ts->tv_nsec = timekeeping_get_ns(&timekeeper);
} while (read_seqretry(&timekeeper.lock, seq));
@@ -306,7 +305,7 @@ ktime_t ktime_get(void)
seq = read_seqbegin(&timekeeper.lock);
secs = timekeeper.xtime_sec +
timekeeper.wall_to_monotonic.tv_sec;
- nsecs = timekeeping_get_ns() +
+ nsecs = timekeeping_get_ns(&timekeeper) +
timekeeper.wall_to_monotonic.tv_nsec;
} while (read_seqretry(&timekeeper.lock, seq));
@@ -336,7 +335,7 @@ void ktime_get_ts(struct timespec *ts)
do {
seq = read_seqbegin(&timekeeper.lock);
ts->tv_sec = timekeeper.xtime_sec;
- ts->tv_nsec = timekeeping_get_ns();
+ ts->tv_nsec = timekeeping_get_ns(&timekeeper);
tomono = timekeeper.wall_to_monotonic;
} while (read_seqretry(&timekeeper.lock, seq));
@@ -371,8 +370,8 @@ void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
ts_real->tv_sec = timekeeper.xtime_sec;
ts_real->tv_nsec = 0;
- nsecs_raw = timekeeping_get_ns_raw();
- nsecs_real = timekeeping_get_ns();
+ nsecs_raw = timekeeping_get_ns_raw(&timekeeper);
+ nsecs_real = timekeeping_get_ns(&timekeeper);
} while (read_seqretry(&timekeeper.lock, seq));
@@ -415,7 +414,7 @@ int do_settimeofday(const struct timespec *tv)
write_seqlock_irqsave(&timekeeper.lock, flags);
- timekeeping_forward_now();
+ timekeeping_forward_now(&timekeeper);
xt = tk_xtime(&timekeeper);
ts_delta.tv_sec = tv->tv_sec - xt.tv_sec;
@@ -426,7 +425,7 @@ int do_settimeofday(const struct timespec *tv)
tk_set_xtime(&timekeeper, tv);
- timekeeping_update(true);
+ timekeeping_update(&timekeeper, true);
write_sequnlock_irqrestore(&timekeeper.lock, flags);
@@ -453,14 +452,14 @@ int timekeeping_inject_offset(struct timespec *ts)
write_seqlock_irqsave(&timekeeper.lock, flags);
- timekeeping_forward_now();
+ timekeeping_forward_now(&timekeeper);
tk_xtime_add(&timekeeper, ts);
timekeeper.wall_to_monotonic =
timespec_sub(timekeeper.wall_to_monotonic, *ts);
- timekeeping_update(true);
+ timekeeping_update(&timekeeper, true);
write_sequnlock_irqrestore(&timekeeper.lock, flags);
@@ -485,14 +484,14 @@ static int change_clocksource(void *data)
write_seqlock_irqsave(&timekeeper.lock, flags);
- timekeeping_forward_now();
+ timekeeping_forward_now(&timekeeper);
if (!new->enable || new->enable(new) == 0) {
old = timekeeper.clock;
- timekeeper_setup_internals(new);
+ tk_setup_internals(&timekeeper, new);
if (old->disable)
old->disable(old);
}
- timekeeping_update(true);
+ timekeeping_update(&timekeeper, true);
write_sequnlock_irqrestore(&timekeeper.lock, flags);
@@ -542,7 +541,7 @@ void getrawmonotonic(struct timespec *ts)
do {
seq = read_seqbegin(&timekeeper.lock);
- nsecs = timekeeping_get_ns_raw();
+ nsecs = timekeeping_get_ns_raw(&timekeeper);
*ts = timekeeper.raw_time;
} while (read_seqretry(&timekeeper.lock, seq));
@@ -638,7 +637,7 @@ void __init timekeeping_init(void)
clock = clocksource_default_clock();
if (clock->enable)
clock->enable(clock);
- timekeeper_setup_internals(clock);
+ tk_setup_internals(&timekeeper, clock);
tk_set_xtime(&timekeeper, &now);
timekeeper.raw_time.tv_sec = 0;
@@ -648,7 +647,7 @@ void __init timekeeping_init(void)
set_normalized_timespec(&timekeeper.wall_to_monotonic,
-boot.tv_sec, -boot.tv_nsec);
- update_rt_offset();
+ update_rt_offset(&timekeeper);
timekeeper.total_sleep_time.tv_sec = 0;
timekeeper.total_sleep_time.tv_nsec = 0;
write_sequnlock_irqrestore(&timekeeper.lock, flags);
@@ -670,7 +669,8 @@ static void update_sleep_time(struct timespec t)
* Takes a timespec offset measuring a suspend interval and properly
* adds the sleep offset to the timekeeping variables.
*/
-static void __timekeeping_inject_sleeptime(struct timespec *delta)
+static void __timekeeping_inject_sleeptime(struct timekeeper *tk,
+ struct timespec *delta)
{
if (!timespec_valid(delta)) {
printk(KERN_WARNING "__timekeeping_inject_sleeptime: Invalid "
@@ -678,10 +678,9 @@ static void __timekeeping_inject_sleeptime(struct timespec *delta)
return;
}
- tk_xtime_add(&timekeeper, delta);
- timekeeper.wall_to_monotonic =
- timespec_sub(timekeeper.wall_to_monotonic, *delta);
- update_sleep_time(timespec_add(timekeeper.total_sleep_time, *delta));
+ tk_xtime_add(tk, delta);
+ tk->wall_to_monotonic = timespec_sub(tk->wall_to_monotonic, *delta);
+ update_sleep_time(timespec_add(tk->total_sleep_time, *delta));
}
@@ -707,11 +706,11 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
write_seqlock_irqsave(&timekeeper.lock, flags);
- timekeeping_forward_now();
+ timekeeping_forward_now(&timekeeper);
- __timekeeping_inject_sleeptime(delta);
+ __timekeeping_inject_sleeptime(&timekeeper, delta);
- timekeeping_update(true);
+ timekeeping_update(&timekeeper, true);
write_sequnlock_irqrestore(&timekeeper.lock, flags);
@@ -740,7 +739,7 @@ static void timekeeping_resume(void)
if (timespec_compare(&ts, &timekeeping_suspend_time) > 0) {
ts = timespec_sub(ts, timekeeping_suspend_time);
- __timekeeping_inject_sleeptime(&ts);
+ __timekeeping_inject_sleeptime(&timekeeper, &ts);
}
/* re-base the last cycle value */
timekeeper.clock->cycle_last = timekeeper.clock->read(timekeeper.clock);
@@ -765,7 +764,7 @@ static int timekeeping_suspend(void)
read_persistent_clock(&timekeeping_suspend_time);
write_seqlock_irqsave(&timekeeper.lock, flags);
- timekeeping_forward_now();
+ timekeeping_forward_now(&timekeeper);
timekeeping_suspended = 1;
/*
@@ -813,7 +812,8 @@ device_initcall(timekeeping_init_ops);
* If the error is already larger, we look ahead even further
* to compensate for late or lost adjustments.
*/
-static __always_inline int timekeeping_bigadjust(s64 error, s64 *interval,
+static __always_inline int timekeeping_bigadjust(struct timekeeper *tk,
+ s64 error, s64 *interval,
s64 *offset)
{
s64 tick_error, i;
@@ -829,7 +829,7 @@ static __always_inline int timekeeping_bigadjust(s64 error, s64 *interval,
* here. This is tuned so that an error of about 1 msec is adjusted
* within about 1 sec (or 2^20 nsec in 2^SHIFT_HZ ticks).
*/
- error2 = timekeeper.ntp_error >> (NTP_SCALE_SHIFT + 22 - 2 * SHIFT_HZ);
+ error2 = tk->ntp_error >> (NTP_SCALE_SHIFT + 22 - 2 * SHIFT_HZ);
error2 = abs(error2);
for (look_ahead = 0; error2 > 0; look_ahead++)
error2 >>= 2;
@@ -838,8 +838,8 @@ static __always_inline int timekeeping_bigadjust(s64 error, s64 *interval,
* 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() >> (timekeeper.ntp_error_shift + 1);
- tick_error -= timekeeper.xtime_interval >> 1;
+ tick_error = ntp_tick_length() >> (tk->ntp_error_shift + 1);
+ tick_error -= tk->xtime_interval >> 1;
error = ((error - tick_error) >> look_ahead) + tick_error;
/* Finally calculate the adjustment shift value. */
@@ -864,9 +864,9 @@ static __always_inline int timekeeping_bigadjust(s64 error, s64 *interval,
* this is optimized for the most common adjustments of -1,0,1,
* for other values we can do a bit more work.
*/
-static void timekeeping_adjust(s64 offset)
+static void timekeeping_adjust(struct timekeeper *tk, s64 offset)
{
- s64 error, interval = timekeeper.cycle_interval;
+ s64 error, interval = tk->cycle_interval;
int adj;
/*
@@ -882,7 +882,7 @@ static void timekeeping_adjust(s64 offset)
*
* Note: It does not "save" on aggravation when reading the code.
*/
- error = timekeeper.ntp_error >> (timekeeper.ntp_error_shift - 1);
+ error = tk->ntp_error >> (tk->ntp_error_shift - 1);
if (error > interval) {
/*
* We now divide error by 4(via shift), which checks if
@@ -904,7 +904,8 @@ static void timekeeping_adjust(s64 offset)
if (likely(error <= interval))
adj = 1;
else
- adj = timekeeping_bigadjust(error, &interval, &offset);
+ adj = timekeeping_bigadjust(tk, error, &interval,
+ &offset);
} else if (error < -interval) {
/* See comment above, this is just switched for the negative */
error >>= 2;
@@ -913,18 +914,17 @@ static void timekeeping_adjust(s64 offset)
interval = -interval;
offset = -offset;
} else
- adj = timekeeping_bigadjust(error, &interval, &offset);
- } else /* No adjustment needed */
+ adj = timekeeping_bigadjust(tk, error, &interval,
+ &offset);
+ } else
return;
- if (unlikely(timekeeper.clock->maxadj &&
- (timekeeper.mult + adj >
- timekeeper.clock->mult + timekeeper.clock->maxadj))) {
+ if (unlikely(tk->clock->maxadj &&
+ (tk->mult + adj > tk->clock->mult + tk->clock->maxadj))) {
printk_once(KERN_WARNING
"Adjusting %s more than 11%% (%ld vs %ld)\n",
- timekeeper.clock->name, (long)timekeeper.mult + adj,
- (long)timekeeper.clock->mult +
- timekeeper.clock->maxadj);
+ tk->clock->name, (long)tk->mult + adj,
+ (long)tk->clock->mult + tk->clock->maxadj);
}
/*
* So the following can be confusing.
@@ -975,11 +975,10 @@ static void timekeeping_adjust(s64 offset)
*
* XXX - TODO: Doc ntp_error calculation.
*/
- timekeeper.mult += adj;
- timekeeper.xtime_interval += interval;
- timekeeper.xtime_nsec -= offset;
- timekeeper.ntp_error -= (interval - offset) <<
- timekeeper.ntp_error_shift;
+ tk->mult += adj;
+ tk->xtime_interval += interval;
+ tk->xtime_nsec -= offset;
+ tk->ntp_error -= (interval - offset) << tk->ntp_error_shift;
/*
* It may be possible that when we entered this function, xtime_nsec
@@ -995,10 +994,10 @@ static void timekeeping_adjust(s64 offset)
* We'll correct this error next time through this function, when
* xtime_nsec is not as small.
*/
- if (unlikely((s64)timekeeper.xtime_nsec < 0)) {
- s64 neg = -(s64)timekeeper.xtime_nsec;
- timekeeper.xtime_nsec = 0;
- timekeeper.ntp_error += neg << timekeeper.ntp_error_shift;
+ if (unlikely((s64)tk->xtime_nsec < 0)) {
+ s64 neg = -(s64)tk->xtime_nsec;
+ tk->xtime_nsec = 0;
+ tk->ntp_error += neg << tk->ntp_error_shift;
}
}
@@ -1042,37 +1041,36 @@ static inline void accumulate_nsecs_to_secs(struct timekeeper *tk)
*
* Returns the unconsumed cycles.
*/
-static cycle_t logarithmic_accumulation(cycle_t offset, u32 shift)
+static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
+ u32 shift)
{
u64 raw_nsecs;
- /* If the offset is smaller than a shifted interval, do nothing */
- if (offset < timekeeper.cycle_interval<<shift)
+ /* If the offset is smaller then a shifted interval, do nothing */
+ if (offset < tk->cycle_interval<<shift)
return offset;
/* Accumulate one shifted interval */
- offset -= timekeeper.cycle_interval << shift;
- timekeeper.clock->cycle_last += timekeeper.cycle_interval << shift;
+ offset -= tk->cycle_interval << shift;
+ tk->clock->cycle_last += tk->cycle_interval << shift;
- timekeeper.xtime_nsec += timekeeper.xtime_interval << shift;
-
- accumulate_nsecs_to_secs(&timekeeper);
+ tk->xtime_nsec += tk->xtime_interval << shift;
+ accumulate_nsecs_to_secs(tk);
/* Accumulate raw time */
- raw_nsecs = timekeeper.raw_interval << shift;
- raw_nsecs += timekeeper.raw_time.tv_nsec;
+ raw_nsecs = tk->raw_interval << shift;
+ raw_nsecs += tk->raw_time.tv_nsec;
if (raw_nsecs >= NSEC_PER_SEC) {
u64 raw_secs = raw_nsecs;
raw_nsecs = do_div(raw_secs, NSEC_PER_SEC);
- timekeeper.raw_time.tv_sec += raw_secs;
+ tk->raw_time.tv_sec += raw_secs;
}
- timekeeper.raw_time.tv_nsec = raw_nsecs;
+ tk->raw_time.tv_nsec = raw_nsecs;
/* Accumulate error between NTP and clock interval */
- timekeeper.ntp_error += ntp_tick_length() << shift;
- timekeeper.ntp_error -=
- (timekeeper.xtime_interval + timekeeper.xtime_remainder) <<
- (timekeeper.ntp_error_shift + shift);
+ tk->ntp_error += ntp_tick_length() << shift;
+ tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) <<
+ (tk->ntp_error_shift + shift);
return offset;
}
@@ -1118,13 +1116,13 @@ static void update_wall_time(void)
maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1;
shift = min(shift, maxshift);
while (offset >= timekeeper.cycle_interval) {
- offset = logarithmic_accumulation(offset, shift);
+ offset = logarithmic_accumulation(&timekeeper, offset, shift);
if(offset < timekeeper.cycle_interval<<shift)
shift--;
}
/* correct the clock when NTP error is too big */
- timekeeping_adjust(offset);
+ timekeeping_adjust(&timekeeper, offset);
/*
@@ -1147,7 +1145,7 @@ static void update_wall_time(void)
*/
accumulate_nsecs_to_secs(&timekeeper);
- timekeeping_update(false);
+ timekeeping_update(&timekeeper, false);
out:
write_sequnlock_irqrestore(&timekeeper.lock, flags);
@@ -1198,7 +1196,7 @@ void get_monotonic_boottime(struct timespec *ts)
do {
seq = read_seqbegin(&timekeeper.lock);
ts->tv_sec = timekeeper.xtime_sec;
- ts->tv_nsec = timekeeping_get_ns();
+ ts->tv_nsec = timekeeping_get_ns(&timekeeper);
tomono = timekeeper.wall_to_monotonic;
sleep = timekeeper.total_sleep_time;
@@ -1330,7 +1328,7 @@ ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot)
seq = read_seqbegin(&timekeeper.lock);
secs = timekeeper.xtime_sec;
- nsecs = timekeeping_get_ns();
+ nsecs = timekeeping_get_ns(&timekeeper);
*offs_real = timekeeper.offs_real;
*offs_boot = timekeeper.offs_boot;
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-05 08:49:10 +0000