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timekeeping: Rework timekeeping_resume() to use shadow_timekeeper

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Updates of the timekeeper can be done by operating on the shadow timekeeper
and afterwards copying the result into the real timekeeper. This has the
advantage, that the sequence count write protected region is kept as small
as possible.

While the sequence count held time is not relevant for the resume path as
there is no concurrency, there is no reason to have this function
different than all the other update sites.

Convert timekeeping_inject_offset() to use this scheme and cleanup the
variable declaration while at it.

Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <jstultz@google.com>
Link: https://lore.kernel.org/all/20241009-devel-anna-maria-b4-timers-ptp-timekeeping-v2-21-554456a44a15@linutronix.de
This commit is contained in:
Anna-Maria Behnsen 2024-10-09 10:29:14 +02:00 committed by Thomas Gleixner
parent 2b473e65de
commit b2350d954d
1 changed files with 10 additions and 12 deletions
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22
kernel/time/timekeeping.c
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@ -1943,12 +1943,12 @@ void timekeeping_inject_sleeptime64(const struct timespec64 *delta)
*/
void timekeeping_resume(void)
{
struct timekeeper *tk = &tk_core.timekeeper;
struct clocksource *clock = tk->tkr_mono.clock;
unsigned long flags;
struct timekeeper *tks = &tk_core.shadow_timekeeper;
struct clocksource *clock = tks->tkr_mono.clock;
struct timespec64 ts_new, ts_delta;
u64 cycle_now, nsec;
bool inject_sleeptime = false;
u64 cycle_now, nsec;
unsigned long flags;
read_persistent_clock64(&ts_new);
@ -1956,7 +1956,6 @@ void timekeeping_resume(void)
clocksource_resume();
raw_spin_lock_irqsave(&tk_core.lock, flags);
write_seqcount_begin(&tk_core.seq);
/*
* After system resumes, we need to calculate the suspended time and
@ -1970,7 +1969,7 @@ void timekeeping_resume(void)
* 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 = tk_clock_read(&tk->tkr_mono);
cycle_now = tk_clock_read(&tks->tkr_mono);
nsec = clocksource_stop_suspend_timing(clock, cycle_now);
if (nsec > 0) {
ts_delta = ns_to_timespec64(nsec);
@ -1982,17 +1981,16 @@ void timekeeping_resume(void)
if (inject_sleeptime) {
suspend_timing_needed = false;
__timekeeping_inject_sleeptime(tk, &ts_delta);
__timekeeping_inject_sleeptime(tks, &ts_delta);
}
/* Re-base the last cycle value */
tk->tkr_mono.cycle_last = cycle_now;
tk->tkr_raw.cycle_last = cycle_now;
tks->tkr_mono.cycle_last = cycle_now;
tks->tkr_raw.cycle_last = cycle_now;
tk->ntp_error = 0;
tks->ntp_error = 0;
timekeeping_suspended = 0;
timekeeping_update(&tk_core, tk, TK_MIRROR | TK_CLOCK_WAS_SET);
write_seqcount_end(&tk_core.seq);
timekeeping_update_from_shadow(&tk_core, TK_CLOCK_WAS_SET);
raw_spin_unlock_irqrestore(&tk_core.lock, flags);
touch_softlockup_watchdog();