diff options
Diffstat (limited to 'include/linux/timekeeper_internal.h')
| -rw-r--r-- | include/linux/timekeeper_internal.h | 35 |
1 files changed, 27 insertions, 8 deletions
diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h index 05af9a334893..25247220b4b7 100644 --- a/include/linux/timekeeper_internal.h +++ b/include/linux/timekeeper_internal.h @@ -16,16 +16,16 @@ * @read: Read function of @clock * @mask: Bitmask for two's complement subtraction of non 64bit clocks * @cycle_last: @clock cycle value at last update - * @mult: NTP adjusted multiplier for scaled math conversion + * @mult: (NTP adjusted) multiplier for scaled math conversion * @shift: Shift value for scaled math conversion * @xtime_nsec: Shifted (fractional) nano seconds offset for readout - * @base_mono: ktime_t (nanoseconds) base time for readout + * @base: ktime_t (nanoseconds) base time for readout * * This struct has size 56 byte on 64 bit. Together with a seqcount it * occupies a single 64byte cache line. * * The struct is separate from struct timekeeper as it is also used - * for a fast NMI safe accessor to clock monotonic. + * for a fast NMI safe accessors. */ struct tk_read_base { struct clocksource *clock; @@ -35,12 +35,13 @@ struct tk_read_base { u32 mult; u32 shift; u64 xtime_nsec; - ktime_t base_mono; + ktime_t base; }; /** * struct timekeeper - Structure holding internal timekeeping values. - * @tkr: The readout base structure + * @tkr_mono: The readout base structure for CLOCK_MONOTONIC + * @tkr_raw: The readout base structure for CLOCK_MONOTONIC_RAW * @xtime_sec: Current CLOCK_REALTIME time in seconds * @ktime_sec: Current CLOCK_MONOTONIC time in seconds * @wall_to_monotonic: CLOCK_REALTIME to CLOCK_MONOTONIC offset @@ -48,7 +49,8 @@ struct tk_read_base { * @offs_boot: Offset clock monotonic -> clock boottime * @offs_tai: Offset clock monotonic -> clock tai * @tai_offset: The current UTC to TAI offset in seconds - * @base_raw: Monotonic raw base time in ktime_t format + * @clock_was_set_seq: The sequence number of clock was set events + * @next_leap_ktime: CLOCK_MONOTONIC time value of a pending leap-second * @raw_time: Monotonic raw base time in timespec64 format * @cycle_interval: Number of clock cycles in one NTP interval * @xtime_interval: Number of clock shifted nano seconds in one NTP @@ -60,6 +62,9 @@ struct tk_read_base { * shifted nano seconds. * @ntp_error_shift: Shift conversion between clock shifted nano seconds and * ntp shifted nano seconds. + * @last_warning: Warning ratelimiter (DEBUG_TIMEKEEPING) + * @underflow_seen: Underflow warning flag (DEBUG_TIMEKEEPING) + * @overflow_seen: Overflow warning flag (DEBUG_TIMEKEEPING) * * Note: For timespec(64) based interfaces wall_to_monotonic is what * we need to add to xtime (or xtime corrected for sub jiffie times) @@ -76,7 +81,8 @@ struct tk_read_base { * used instead. */ struct timekeeper { - struct tk_read_base tkr; + struct tk_read_base tkr_mono; + struct tk_read_base tkr_raw; u64 xtime_sec; unsigned long ktime_sec; struct timespec64 wall_to_monotonic; @@ -84,7 +90,8 @@ struct timekeeper { ktime_t offs_boot; ktime_t offs_tai; s32 tai_offset; - ktime_t base_raw; + unsigned int clock_was_set_seq; + ktime_t next_leap_ktime; struct timespec64 raw_time; /* The following members are for timekeeping internal use */ @@ -104,6 +111,18 @@ struct timekeeper { s64 ntp_error; u32 ntp_error_shift; u32 ntp_err_mult; +#ifdef CONFIG_DEBUG_TIMEKEEPING + long last_warning; + /* + * These simple flag variables are managed + * without locks, which is racy, but they are + * ok since we don't really care about being + * super precise about how many events were + * seen, just that a problem was observed. + */ + int underflow_seen; + int overflow_seen; +#endif }; #ifdef CONFIG_GENERIC_TIME_VSYSCALL |