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timekeeping: Move lock out of timekeeper struct 

Make the lock a separate entity. Preparatory patch for shadow
timekeeper structure.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[Merged with CLOCK_TAI changes]
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Thomas Gleixner 2013-02-21 22:51:37 +00:00 committed by John Stultz
parent eb93e4d930
commit 7e40672d93
2 changed files with 53 additions and 57 deletions
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2
include/linux/timekeeper_internal.h
View File

@ -67,8 +67,6 @@ struct timekeeper {
/* Offset clock monotonic -> clock tai */
ktime_t offs_tai;
/* Seqlock for all timekeeper values */
seqlock_t lock;
};
static inline struct timespec tk_xtime(struct timekeeper *tk)

108
kernel/time/timekeeping.c
View File

@ -26,6 +26,7 @@
#include "tick-internal.h"
static struct timekeeper timekeeper;
static DEFINE_SEQLOCK(timekeeper_lock);
/* flag for if timekeeping is suspended */
int __read_mostly timekeeping_suspended;
@ -212,11 +213,11 @@ int pvclock_gtod_register_notifier(struct notifier_block *nb)
unsigned long flags;
int ret;
write_seqlock_irqsave(&tk->lock, flags);
write_seqlock_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);
write_sequnlock_irqrestore(&timekeeper_lock, flags);
return ret;
}
@ -230,13 +231,12 @@ EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier);
*/
int pvclock_gtod_unregister_notifier(struct notifier_block *nb)
{
struct timekeeper *tk = &timekeeper;
unsigned long flags;
int ret;
write_seqlock_irqsave(&tk->lock, flags);
write_seqlock_irqsave(&timekeeper_lock, flags);
ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb);
write_sequnlock_irqrestore(&tk->lock, flags);
write_sequnlock_irqrestore(&timekeeper_lock, flags);
return ret;
}
@ -296,12 +296,12 @@ int __getnstimeofday(struct timespec *ts)
s64 nsecs = 0;
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
ts->tv_sec = tk->xtime_sec;
nsecs = timekeeping_get_ns(tk);
} while (read_seqretry(&tk->lock, seq));
} while (read_seqretry(&timekeeper_lock, seq));
ts->tv_nsec = 0;
timespec_add_ns(ts, nsecs);
@ -337,11 +337,11 @@ ktime_t ktime_get(void)
WARN_ON(timekeeping_suspended);
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
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_seqretry(&timekeeper_lock, seq));
/*
* Use ktime_set/ktime_add_ns to create a proper ktime on
* 32-bit architectures without CONFIG_KTIME_SCALAR.
@ -368,12 +368,12 @@ void ktime_get_ts(struct timespec *ts)
WARN_ON(timekeeping_suspended);
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
ts->tv_sec = tk->xtime_sec;
nsec = timekeeping_get_ns(tk);
tomono = tk->wall_to_monotonic;
} while (read_seqretry(&tk->lock, seq));
} while (read_seqretry(&timekeeper_lock, seq));
ts->tv_sec += tomono.tv_sec;
ts->tv_nsec = 0;
@ -397,12 +397,12 @@ void timekeeping_clocktai(struct timespec *ts)
WARN_ON(timekeeping_suspended);
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
ts->tv_sec = tk->xtime_sec + tk->tai_offset;
nsecs = timekeeping_get_ns(tk);
} while (read_seqretry(&tk->lock, seq));
} while (read_seqretry(&timekeeper_lock, seq));
ts->tv_nsec = 0;
timespec_add_ns(ts, nsecs);
@ -445,7 +445,7 @@ 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_seqbegin(&timekeeper_lock);
*ts_raw = tk->raw_time;
ts_real->tv_sec = tk->xtime_sec;
@ -454,7 +454,7 @@ 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_seqretry(&timekeeper_lock, seq));
timespec_add_ns(ts_raw, nsecs_raw);
timespec_add_ns(ts_real, nsecs_real);
@ -494,7 +494,7 @@ int do_settimeofday(const struct timespec *tv)
if (!timespec_valid_strict(tv))
return -EINVAL;
write_seqlock_irqsave(&tk->lock, flags);
write_seqlock_irqsave(&timekeeper_lock, flags);
timekeeping_forward_now(tk);
@ -508,7 +508,7 @@ int do_settimeofday(const struct timespec *tv)
timekeeping_update(tk, true);
write_sequnlock_irqrestore(&tk->lock, flags);
write_sequnlock_irqrestore(&timekeeper_lock, flags);
/* signal hrtimers about time change */
clock_was_set();
@ -533,7 +533,7 @@ int timekeeping_inject_offset(struct timespec *ts)
if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
write_seqlock_irqsave(&tk->lock, flags);
write_seqlock_irqsave(&timekeeper_lock, flags);
timekeeping_forward_now(tk);
@ -550,7 +550,7 @@ int timekeeping_inject_offset(struct timespec *ts)
error: /* even if we error out, we forwarded the time, so call update */
timekeeping_update(tk, true);
write_sequnlock_irqrestore(&tk->lock, flags);
write_sequnlock_irqrestore(&timekeeper_lock, flags);
/* signal hrtimers about time change */
clock_was_set();
@ -571,9 +571,9 @@ s32 timekeeping_get_tai_offset(void)
s32 ret;
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
ret = tk->tai_offset;
} while (read_seqretry(&tk->lock, seq));
} while (read_seqretry(&timekeeper_lock, seq));
return ret;
}
@ -597,9 +597,9 @@ void timekeeping_set_tai_offset(s32 tai_offset)
struct timekeeper *tk = &timekeeper;
unsigned long flags;
write_seqlock_irqsave(&tk->lock, flags);
write_seqlock_irqsave(&timekeeper_lock, flags);
__timekeeping_set_tai_offset(tk, tai_offset);
write_sequnlock_irqrestore(&tk->lock, flags);
write_sequnlock_irqrestore(&timekeeper_lock, flags);
}
/**
@ -615,7 +615,7 @@ static int change_clocksource(void *data)
new = (struct clocksource *) data;
write_seqlock_irqsave(&tk->lock, flags);
write_seqlock_irqsave(&timekeeper_lock, flags);
timekeeping_forward_now(tk);
if (!new->enable || new->enable(new) == 0) {
@ -626,7 +626,7 @@ static int change_clocksource(void *data)
}
timekeeping_update(tk, true);
write_sequnlock_irqrestore(&tk->lock, flags);
write_sequnlock_irqrestore(&timekeeper_lock, flags);
return 0;
}
@ -676,11 +676,11 @@ void getrawmonotonic(struct timespec *ts)
s64 nsecs;
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
nsecs = timekeeping_get_ns_raw(tk);
*ts = tk->raw_time;
} while (read_seqretry(&tk->lock, seq));
} while (read_seqretry(&timekeeper_lock, seq));
timespec_add_ns(ts, nsecs);
}
@ -696,11 +696,11 @@ int timekeeping_valid_for_hres(void)
int ret;
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
ret = tk->clock->flags & CLOCK_SOURCE_VALID_FOR_HRES;
} while (read_seqretry(&tk->lock, seq));
} while (read_seqretry(&timekeeper_lock, seq));
return ret;
}
@ -715,11 +715,11 @@ u64 timekeeping_max_deferment(void)
u64 ret;
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
ret = tk->clock->max_idle_ns;
} while (read_seqretry(&tk->lock, seq));
} while (read_seqretry(&timekeeper_lock, seq));
return ret;
}
@ -782,11 +782,9 @@ void __init timekeeping_init(void)
boot.tv_nsec = 0;
}
seqlock_init(&tk->lock);
ntp_init();
write_seqlock_irqsave(&tk->lock, flags);
write_seqlock_irqsave(&timekeeper_lock, flags);
clock = clocksource_default_clock();
if (clock->enable)
clock->enable(clock);
@ -805,7 +803,7 @@ void __init timekeeping_init(void)
tmp.tv_nsec = 0;
tk_set_sleep_time(tk, tmp);
write_sequnlock_irqrestore(&tk->lock, flags);
write_sequnlock_irqrestore(&timekeeper_lock, flags);
}
/* time in seconds when suspend began */
@ -853,7 +851,7 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
if (has_persistent_clock())
return;
write_seqlock_irqsave(&tk->lock, flags);
write_seqlock_irqsave(&timekeeper_lock, flags);
timekeeping_forward_now(tk);
@ -861,7 +859,7 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
timekeeping_update(tk, true);
write_sequnlock_irqrestore(&tk->lock, flags);
write_sequnlock_irqrestore(&timekeeper_lock, flags);
/* signal hrtimers about time change */
clock_was_set();
@ -888,7 +886,7 @@ static void timekeeping_resume(void)
clockevents_resume();
clocksource_resume();
write_seqlock_irqsave(&tk->lock, flags);
write_seqlock_irqsave(&timekeeper_lock, flags);
/*
* After system resumes, we need to calculate the suspended time and
@ -940,7 +938,7 @@ static void timekeeping_resume(void)
tk->ntp_error = 0;
timekeeping_suspended = 0;
timekeeping_update(tk, false);
write_sequnlock_irqrestore(&tk->lock, flags);
write_sequnlock_irqrestore(&timekeeper_lock, flags);
touch_softlockup_watchdog();
@ -959,7 +957,7 @@ static int timekeeping_suspend(void)
read_persistent_clock(&timekeeping_suspend_time);
write_seqlock_irqsave(&tk->lock, flags);
write_seqlock_irqsave(&timekeeper_lock, flags);
timekeeping_forward_now(tk);
timekeeping_suspended = 1;
@ -982,7 +980,7 @@ static int timekeeping_suspend(void)
timekeeping_suspend_time =
timespec_add(timekeeping_suspend_time, delta_delta);
}
write_sequnlock_irqrestore(&tk->lock, flags);
write_sequnlock_irqrestore(&timekeeper_lock, flags);
clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL);
clocksource_suspend();
@ -1322,7 +1320,7 @@ static void update_wall_time(void)
int shift = 0, maxshift;
unsigned long flags;
write_seqlock_irqsave(&tk->lock, flags);
write_seqlock_irqsave(&timekeeper_lock, flags);
/* Make sure we're fully resumed: */
if (unlikely(timekeeping_suspended))
@ -1377,7 +1375,7 @@ static void update_wall_time(void)
timekeeping_update(tk, false);
out:
write_sequnlock_irqrestore(&tk->lock, flags);
write_sequnlock_irqrestore(&timekeeper_lock, flags);
}
@ -1425,13 +1423,13 @@ void get_monotonic_boottime(struct timespec *ts)
WARN_ON(timekeeping_suspended);
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
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_seqretry(&timekeeper_lock, seq));
ts->tv_sec += tomono.tv_sec + sleep.tv_sec;
ts->tv_nsec = 0;
@ -1490,10 +1488,10 @@ struct timespec current_kernel_time(void)
unsigned long seq;
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
now = tk_xtime(tk);
} while (read_seqretry(&tk->lock, seq));
} while (read_seqretry(&timekeeper_lock, seq));
return now;
}
@ -1506,11 +1504,11 @@ struct timespec get_monotonic_coarse(void)
unsigned long seq;
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
now = tk_xtime(tk);
mono = tk->wall_to_monotonic;
} while (read_seqretry(&tk->lock, seq));
} while (read_seqretry(&timekeeper_lock, seq));
set_normalized_timespec(&now, now.tv_sec + mono.tv_sec,
now.tv_nsec + mono.tv_nsec);
@ -1541,11 +1539,11 @@ void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
unsigned long seq;
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
*xtim = tk_xtime(tk);
*wtom = tk->wall_to_monotonic;
*sleep = tk->total_sleep_time;
} while (read_seqretry(&tk->lock, seq));
} while (read_seqretry(&timekeeper_lock, seq));
}
#ifdef CONFIG_HIGH_RES_TIMERS
@ -1566,7 +1564,7 @@ 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_seqbegin(&timekeeper_lock);
secs = tk->xtime_sec;
nsecs = timekeeping_get_ns(tk);
@ -1574,7 +1572,7 @@ ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot,
*offs_real = tk->offs_real;
*offs_boot = tk->offs_boot;
*offs_tai = tk->offs_tai;
} while (read_seqretry(&tk->lock, seq));
} while (read_seqretry(&timekeeper_lock, seq));
now = ktime_add_ns(ktime_set(secs, 0), nsecs);
now = ktime_sub(now, *offs_real);
@ -1592,9 +1590,9 @@ ktime_t ktime_get_monotonic_offset(void)
struct timespec wtom;
do {
seq = read_seqbegin(&tk->lock);
seq = read_seqbegin(&timekeeper_lock);
wtom = tk->wall_to_monotonic;
} while (read_seqretry(&tk->lock, seq));
} while (read_seqretry(&timekeeper_lock, seq));
return timespec_to_ktime(wtom);
}