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    Subject[PATCH 5/7] timekeeping: Add a fast and NMI safe boot clock
    Date
    From: Joel Fernandes <joelaf@google.com>

    This boot clock can be used as a tracing clock and will account for
    suspend time.

    To keep it NMI safe since we're accessing from tracing, we're not using a
    separate timekeeper with updates to monotonic clock and boot offset
    protected with seqlocks. This has the following minor side effects:

    (1) Its possible that a timestamp be taken after the boot offset is updated
    but before the timekeeper is updated. If this happens, the new boot offset
    is added to the old timekeeping making the clock appear to update slightly
    earlier:
    CPU 0 CPU 1
    timekeeping_inject_sleeptime64()
    __timekeeping_inject_sleeptime(tk, delta);
    timestamp();
    timekeeping_update(tk, TK_CLEAR_NTP...);

    (2) On 32-bit systems, the 64-bit boot offset (tk->offs_boot) may be
    partially updated. Since the tk->offs_boot update is a rare event, this
    should be a rare occurrence which postprocessing should be able to handle.

    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Richard Cochran <richardcochran@gmail.com>
    Cc: Prarit Bhargava <prarit@redhat.com>
    Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: Joel Fernandes <joelaf@google.com>
    Signed-off-by: John Stultz <john.stultz@linaro.org>
    ---
    include/linux/timekeeping.h | 1 +
    kernel/time/timekeeping.c | 29 +++++++++++++++++++++++++++++
    2 files changed, 30 insertions(+)

    diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
    index 09168c5..361f8bf 100644
    --- a/include/linux/timekeeping.h
    +++ b/include/linux/timekeeping.h
    @@ -249,6 +249,7 @@ static inline u64 ktime_get_raw_ns(void)

    extern u64 ktime_get_mono_fast_ns(void);
    extern u64 ktime_get_raw_fast_ns(void);
    +extern u64 ktime_get_boot_fast_ns(void);

    /*
    * Timespec interfaces utilizing the ktime based ones
    diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
    index 37dec7e..b2286e9 100644
    --- a/kernel/time/timekeeping.c
    +++ b/kernel/time/timekeeping.c
    @@ -425,6 +425,35 @@ u64 ktime_get_raw_fast_ns(void)
    }
    EXPORT_SYMBOL_GPL(ktime_get_raw_fast_ns);

    +/**
    + * ktime_get_boot_fast_ns - NMI safe and fast access to boot clock.
    + *
    + * To keep it NMI safe since we're accessing from tracing, we're not using a
    + * separate timekeeper with updates to monotonic clock and boot offset
    + * protected with seqlocks. This has the following minor side effects:
    + *
    + * (1) Its possible that a timestamp be taken after the boot offset is updated
    + * but before the timekeeper is updated. If this happens, the new boot offset
    + * is added to the old timekeeping making the clock appear to update slightly
    + * earlier:
    + * CPU 0 CPU 1
    + * timekeeping_inject_sleeptime64()
    + * __timekeeping_inject_sleeptime(tk, delta);
    + * timestamp();
    + * timekeeping_update(tk, TK_CLEAR_NTP...);
    + *
    + * (2) On 32-bit systems, the 64-bit boot offset (tk->offs_boot) may be
    + * partially updated. Since the tk->offs_boot update is a rare event, this
    + * should be a rare occurrence which postprocessing should be able to handle.
    + */
    +u64 notrace ktime_get_boot_fast_ns(void)
    +{
    + struct timekeeper *tk = &tk_core.timekeeper;
    +
    + return (ktime_get_mono_fast_ns() + ktime_to_ns(tk->offs_boot));
    +}
    +EXPORT_SYMBOL_GPL(ktime_get_boot_fast_ns);
    +
    /* Suspend-time cycles value for halted fast timekeeper. */
    static cycle_t cycles_at_suspend;

    --
    2.7.4
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