#include "tick-internal.h"
#include "ntp_internal.h"
+#include "timekeeping_internal.h"
+
+#define TK_CLEAR_NTP (1 << 0)
+#define TK_MIRROR (1 << 1)
+#define TK_CLOCK_WAS_SET (1 << 2)
static struct timekeeper timekeeper;
static DEFINE_RAW_SPINLOCK(timekeeper_lock);
static RAW_NOTIFIER_HEAD(pvclock_gtod_chain);
-static void update_pvclock_gtod(struct timekeeper *tk)
+static void update_pvclock_gtod(struct timekeeper *tk, bool was_set)
{
- raw_notifier_call_chain(&pvclock_gtod_chain, 0, tk);
+ raw_notifier_call_chain(&pvclock_gtod_chain, was_set, tk);
}
/**
raw_spin_lock_irqsave(&timekeeper_lock, flags);
ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb);
- update_pvclock_gtod(tk);
+ update_pvclock_gtod(tk, true);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
return ret;
EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier);
/* must hold timekeeper_lock */
-static void timekeeping_update(struct timekeeper *tk, bool clearntp, bool mirror)
+static void timekeeping_update(struct timekeeper *tk, unsigned int action)
{
- if (clearntp) {
+ if (action & TK_CLEAR_NTP) {
tk->ntp_error = 0;
ntp_clear();
}
update_vsyscall(tk);
- update_pvclock_gtod(tk);
+ update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET);
- if (mirror)
+ if (action & TK_MIRROR)
memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper));
}
tk_set_xtime(tk, tv);
- timekeeping_update(tk, true, true);
+ timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
write_seqcount_end(&timekeeper_seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
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, true);
+ timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
write_seqcount_end(&timekeeper_seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
write_seqcount_begin(&timekeeper_seq);
timekeeping_forward_now(tk);
- if (!new->enable || new->enable(new) == 0) {
- old = tk->clock;
- tk_setup_internals(tk, new);
- if (old->disable)
- old->disable(old);
+ /*
+ * If the cs is in module, get a module reference. Succeeds
+ * for built-in code (owner == NULL) as well.
+ */
+ if (try_module_get(new->owner)) {
+ if (!new->enable || new->enable(new) == 0) {
+ old = tk->clock;
+ tk_setup_internals(tk, new);
+ if (old->disable)
+ old->disable(old);
+ module_put(old->owner);
+ } else {
+ module_put(new->owner);
+ }
}
- timekeeping_update(tk, true, true);
+ timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
write_seqcount_end(&timekeeper_seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
* This function is called from clocksource.c after a new, better clock
* source has been registered. The caller holds the clocksource_mutex.
*/
-void timekeeping_notify(struct clocksource *clock)
+int timekeeping_notify(struct clocksource *clock)
{
struct timekeeper *tk = &timekeeper;
if (tk->clock == clock)
- return;
+ return 0;
stop_machine(change_clocksource, clock, NULL);
tick_clock_notify();
+ return tk->clock == clock ? 0 : -1;
}
/**
tk_xtime_add(tk, delta);
tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *delta));
tk_set_sleep_time(tk, timespec_add(tk->total_sleep_time, *delta));
+ tk_debug_account_sleep_time(delta);
}
/**
__timekeeping_inject_sleeptime(tk, delta);
- timekeeping_update(tk, true, true);
+ timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
write_seqcount_end(&timekeeper_seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
tk->cycle_last = clock->cycle_last = cycle_now;
tk->ntp_error = 0;
timekeeping_suspended = 0;
- timekeeping_update(tk, false, true);
+ timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET);
write_seqcount_end(&timekeeper_seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
* It also calls into the NTP code to handle leapsecond processing.
*
*/
-static inline void accumulate_nsecs_to_secs(struct timekeeper *tk)
+static inline unsigned int accumulate_nsecs_to_secs(struct timekeeper *tk)
{
u64 nsecps = (u64)NSEC_PER_SEC << tk->shift;
+ unsigned int action = 0;
while (tk->xtime_nsec >= nsecps) {
int leap;
__timekeeping_set_tai_offset(tk, tk->tai_offset - leap);
clock_was_set_delayed();
+ action = TK_CLOCK_WAS_SET;
}
}
+ return action;
}
/**
struct timekeeper *tk = &shadow_timekeeper;
cycle_t offset;
int shift = 0, maxshift;
+ unsigned int action;
unsigned long flags;
raw_spin_lock_irqsave(&timekeeper_lock, flags);
* Finally, make sure that after the rounding
* xtime_nsec isn't larger than NSEC_PER_SEC
*/
- accumulate_nsecs_to_secs(tk);
+ action = accumulate_nsecs_to_secs(tk);
write_seqcount_begin(&timekeeper_seq);
/* Update clock->cycle_last with the new value */
* updating.
*/
memcpy(real_tk, tk, sizeof(*tk));
- timekeeping_update(real_tk, false, false);
+ timekeeping_update(real_tk, action);
write_seqcount_end(&timekeeper_seq);
out:
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
if (tai != orig_tai) {
__timekeeping_set_tai_offset(tk, tai);
+ update_pvclock_gtod(tk, true);
clock_was_set_delayed();
}
write_seqcount_end(&timekeeper_seq);