Messages in this thread Patch in this message | | | From | Hikaru Nishida <> | Subject | [RFC PATCH 1/2] timekeeping: Add timekeeping_adjust_boottime | Date | Wed, 10 Feb 2021 19:39:07 +0900 |
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From: Hikaru Nishida <hikalium@chromium.org>
This introduces timekeeping_adjust_boottime() to give an interface to modules that enables to advance CLOCK_BOOTTIME from userspace for virtualized environments. Later patch introduces a sysfs interface which calls this function.
Signed-off-by: Hikaru Nishida <hikalium@chromium.org> ---
include/linux/timekeeping.h | 2 ++ kernel/time/timekeeping.c | 26 ++++++++++++++++++++++++++ 2 files changed, 28 insertions(+)
diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h index c6792cf01bc7..9bb91fbd945c 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -221,6 +221,8 @@ extern bool timekeeping_rtc_skipresume(void); extern void timekeeping_inject_sleeptime64(const struct timespec64 *delta); +extern int timekeeping_adjust_boottime(const struct timespec64 *delta); + /* * struct ktime_timestanps - Simultaneous mono/boot/real timestamps * @mono: Monotonic timestamp diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index 6aee5768c86f..02892deede62 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -1740,6 +1740,32 @@ void timekeeping_inject_sleeptime64(const struct timespec64 *delta) } #endif +#if defined(CONFIG_BOOTTIME_ADJUSTMENT) +/** + * timekeeping_adjust_boottime - Adjust CLOCK_BOOTTIME by adding a given delta + */ +int timekeeping_adjust_boottime(const struct timespec64 *delta) +{ + struct timekeeper *tk = &tk_core.timekeeper; + unsigned long flags; + + if (!timespec64_valid_strict(delta)) + return -EINVAL; + + raw_spin_lock_irqsave(&timekeeper_lock, flags); + write_seqcount_begin(&tk_core.seq); + + tk_update_sleep_time(tk, timespec64_to_ktime(*delta)); + timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); + + write_seqcount_end(&tk_core.seq); + raw_spin_unlock_irqrestore(&timekeeper_lock, flags); + + return 0; +} +EXPORT_SYMBOL_GPL(timekeeping_adjust_boottime); +#endif + /** * timekeeping_resume - Resumes the generic timekeeping subsystem. */ -- 2.30.0.478.g8a0d178c01-goog
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