diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-15 12:13:56 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-15 12:13:56 -0700 |
commit | 8a284c062ec923c924c79e3b1b5199b8d72904fc (patch) | |
tree | aa016cb632e01e4b3c989db102137a87adc5b239 /include | |
parent | 208de21477679175384b5dc1e6dcf97bd568e8cb (diff) | |
parent | 6436257b491cc0d456c39330dfc22126148d5ed7 (diff) |
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer updates from Thomas Gleixner:
"The timer department delivers this time:
- Support for cross clock domain timestamps in the core code plus a
first user. That allows more precise timestamping for PTP and
later for audio and other peripherals.
The ptp/e1000e patches have been acked by the relevant maintainers
and are carried in the timer tree to avoid merge ordering issues.
- Support for unregistering the current clocksource watchdog. That
lifts a limitation for switching clocksources which has been there
from day 1
- The usual pile of fixes and updates to the core and the drivers.
Nothing outstanding and exciting"
* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (26 commits)
time/timekeeping: Work around false positive GCC warning
e1000e: Adds hardware supported cross timestamp on e1000e nic
ptp: Add PTP_SYS_OFFSET_PRECISE for driver crosstimestamping
x86/tsc: Always Running Timer (ART) correlated clocksource
hrtimer: Revert CLOCK_MONOTONIC_RAW support
time: Add history to cross timestamp interface supporting slower devices
time: Add driver cross timestamp interface for higher precision time synchronization
time: Remove duplicated code in ktime_get_raw_and_real()
time: Add timekeeping snapshot code capturing system time and counter
time: Add cycles to nanoseconds translation
jiffies: Use CLOCKSOURCE_MASK instead of constant
clocksource: Introduce clocksource_freq2mult()
clockevents/drivers/exynos_mct: Implement ->set_state_oneshot_stopped()
clockevents/drivers/arm_global_timer: Implement ->set_state_oneshot_stopped()
clockevents/drivers/arm_arch_timer: Implement ->set_state_oneshot_stopped()
clocksource/drivers/arm_global_timer: Register delay timer
clocksource/drivers/lpc32xx: Support timer-based ARM delay
clocksource/drivers/lpc32xx: Support periodic mode
clocksource/drivers/lpc32xx: Don't use the prescaler counter for clockevents
clocksource/drivers/rockchip: Add err handle for rk_timer_init
...
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/clockchips.h | 4 | ||||
-rw-r--r-- | include/linux/clocksource.h | 45 | ||||
-rw-r--r-- | include/linux/pps_kernel.h | 17 | ||||
-rw-r--r-- | include/linux/ptp_clock_kernel.h | 8 | ||||
-rw-r--r-- | include/linux/timekeeper_internal.h | 2 | ||||
-rw-r--r-- | include/linux/timekeeping.h | 58 | ||||
-rw-r--r-- | include/uapi/linux/ptp_clock.h | 13 |
7 files changed, 107 insertions, 40 deletions
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h index bdcf358dfce2..0d442e34c349 100644 --- a/include/linux/clockchips.h +++ b/include/linux/clockchips.h @@ -190,9 +190,9 @@ extern void clockevents_config_and_register(struct clock_event_device *dev, extern int clockevents_update_freq(struct clock_event_device *ce, u32 freq); static inline void -clockevents_calc_mult_shift(struct clock_event_device *ce, u32 freq, u32 minsec) +clockevents_calc_mult_shift(struct clock_event_device *ce, u32 freq, u32 maxsec) { - return clocks_calc_mult_shift(&ce->mult, &ce->shift, NSEC_PER_SEC, freq, minsec); + return clocks_calc_mult_shift(&ce->mult, &ce->shift, NSEC_PER_SEC, freq, maxsec); } extern void clockevents_suspend(void); diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index 6013021a3b39..a307bf62974f 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -118,6 +118,23 @@ struct clocksource { /* simplify initialization of mask field */ #define CLOCKSOURCE_MASK(bits) (cycle_t)((bits) < 64 ? ((1ULL<<(bits))-1) : -1) +static inline u32 clocksource_freq2mult(u32 freq, u32 shift_constant, u64 from) +{ + /* freq = cyc/from + * mult/2^shift = ns/cyc + * mult = ns/cyc * 2^shift + * mult = from/freq * 2^shift + * mult = from * 2^shift / freq + * mult = (from<<shift) / freq + */ + u64 tmp = ((u64)from) << shift_constant; + + tmp += freq/2; /* round for do_div */ + do_div(tmp, freq); + + return (u32)tmp; +} + /** * clocksource_khz2mult - calculates mult from khz and shift * @khz: Clocksource frequency in KHz @@ -128,19 +145,7 @@ struct clocksource { */ static inline u32 clocksource_khz2mult(u32 khz, u32 shift_constant) { - /* khz = cyc/(Million ns) - * mult/2^shift = ns/cyc - * mult = ns/cyc * 2^shift - * mult = 1Million/khz * 2^shift - * mult = 1000000 * 2^shift / khz - * mult = (1000000<<shift) / khz - */ - u64 tmp = ((u64)1000000) << shift_constant; - - tmp += khz/2; /* round for do_div */ - do_div(tmp, khz); - - return (u32)tmp; + return clocksource_freq2mult(khz, shift_constant, NSEC_PER_MSEC); } /** @@ -154,19 +159,7 @@ static inline u32 clocksource_khz2mult(u32 khz, u32 shift_constant) */ static inline u32 clocksource_hz2mult(u32 hz, u32 shift_constant) { - /* hz = cyc/(Billion ns) - * mult/2^shift = ns/cyc - * mult = ns/cyc * 2^shift - * mult = 1Billion/hz * 2^shift - * mult = 1000000000 * 2^shift / hz - * mult = (1000000000<<shift) / hz - */ - u64 tmp = ((u64)1000000000) << shift_constant; - - tmp += hz/2; /* round for do_div */ - do_div(tmp, hz); - - return (u32)tmp; + return clocksource_freq2mult(hz, shift_constant, NSEC_PER_SEC); } /** diff --git a/include/linux/pps_kernel.h b/include/linux/pps_kernel.h index 54bf1484d41f..35ac903956c7 100644 --- a/include/linux/pps_kernel.h +++ b/include/linux/pps_kernel.h @@ -111,22 +111,17 @@ static inline void timespec_to_pps_ktime(struct pps_ktime *kt, kt->nsec = ts.tv_nsec; } -#ifdef CONFIG_NTP_PPS - static inline void pps_get_ts(struct pps_event_time *ts) { - ktime_get_raw_and_real_ts64(&ts->ts_raw, &ts->ts_real); -} + struct system_time_snapshot snap; -#else /* CONFIG_NTP_PPS */ - -static inline void pps_get_ts(struct pps_event_time *ts) -{ - ktime_get_real_ts64(&ts->ts_real); + ktime_get_snapshot(&snap); + ts->ts_real = ktime_to_timespec64(snap.real); +#ifdef CONFIG_NTP_PPS + ts->ts_raw = ktime_to_timespec64(snap.raw); +#endif } -#endif /* CONFIG_NTP_PPS */ - /* Subtract known time delay from PPS event time(s) */ static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec64 delta) { diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h index b8b73066d137..6b15e168148a 100644 --- a/include/linux/ptp_clock_kernel.h +++ b/include/linux/ptp_clock_kernel.h @@ -38,6 +38,7 @@ struct ptp_clock_request { }; }; +struct system_device_crosststamp; /** * struct ptp_clock_info - decribes a PTP hardware clock * @@ -67,6 +68,11 @@ struct ptp_clock_request { * @gettime64: Reads the current time from the hardware clock. * parameter ts: Holds the result. * + * @getcrosststamp: Reads the current time from the hardware clock and + * system clock simultaneously. + * parameter cts: Contains timestamp (device,system) pair, + * where system time is realtime and monotonic. + * * @settime64: Set the current time on the hardware clock. * parameter ts: Time value to set. * @@ -105,6 +111,8 @@ struct ptp_clock_info { int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta); int (*adjtime)(struct ptp_clock_info *ptp, s64 delta); int (*gettime64)(struct ptp_clock_info *ptp, struct timespec64 *ts); + int (*getcrosststamp)(struct ptp_clock_info *ptp, + struct system_device_crosststamp *cts); int (*settime64)(struct ptp_clock_info *p, const struct timespec64 *ts); int (*enable)(struct ptp_clock_info *ptp, struct ptp_clock_request *request, int on); diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h index 25247220b4b7..e88005459035 100644 --- a/include/linux/timekeeper_internal.h +++ b/include/linux/timekeeper_internal.h @@ -50,6 +50,7 @@ struct tk_read_base { * @offs_tai: Offset clock monotonic -> clock tai * @tai_offset: The current UTC to TAI offset in seconds * @clock_was_set_seq: The sequence number of clock was set events + * @cs_was_changed_seq: The sequence number of clocksource change 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 @@ -91,6 +92,7 @@ struct timekeeper { ktime_t offs_tai; s32 tai_offset; unsigned int clock_was_set_seq; + u8 cs_was_changed_seq; ktime_t next_leap_ktime; struct timespec64 raw_time; diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h index ec89d846324c..96f37bee3bc1 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -267,6 +267,64 @@ extern void ktime_get_raw_and_real_ts64(struct timespec64 *ts_raw, struct timespec64 *ts_real); /* + * struct system_time_snapshot - simultaneous raw/real time capture with + * counter value + * @cycles: Clocksource counter value to produce the system times + * @real: Realtime system time + * @raw: Monotonic raw system time + * @clock_was_set_seq: The sequence number of clock was set events + * @cs_was_changed_seq: The sequence number of clocksource change events + */ +struct system_time_snapshot { + cycle_t cycles; + ktime_t real; + ktime_t raw; + unsigned int clock_was_set_seq; + u8 cs_was_changed_seq; +}; + +/* + * struct system_device_crosststamp - system/device cross-timestamp + * (syncronized capture) + * @device: Device time + * @sys_realtime: Realtime simultaneous with device time + * @sys_monoraw: Monotonic raw simultaneous with device time + */ +struct system_device_crosststamp { + ktime_t device; + ktime_t sys_realtime; + ktime_t sys_monoraw; +}; + +/* + * struct system_counterval_t - system counter value with the pointer to the + * corresponding clocksource + * @cycles: System counter value + * @cs: Clocksource corresponding to system counter value. Used by + * timekeeping code to verify comparibility of two cycle values + */ +struct system_counterval_t { + cycle_t cycles; + struct clocksource *cs; +}; + +/* + * Get cross timestamp between system clock and device clock + */ +extern int get_device_system_crosststamp( + int (*get_time_fn)(ktime_t *device_time, + struct system_counterval_t *system_counterval, + void *ctx), + void *ctx, + struct system_time_snapshot *history, + struct system_device_crosststamp *xtstamp); + +/* + * Simultaneously snapshot realtime and monotonic raw clocks + */ +extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot); + +/* * Persistent clock related interfaces */ extern int persistent_clock_is_local; diff --git a/include/uapi/linux/ptp_clock.h b/include/uapi/linux/ptp_clock.h index f0b7bfe5da92..ac6dded80ffa 100644 --- a/include/uapi/linux/ptp_clock.h +++ b/include/uapi/linux/ptp_clock.h @@ -51,7 +51,9 @@ struct ptp_clock_caps { int n_per_out; /* Number of programmable periodic signals. */ int pps; /* Whether the clock supports a PPS callback. */ int n_pins; /* Number of input/output pins. */ - int rsv[14]; /* Reserved for future use. */ + /* Whether the clock supports precise system-device cross timestamps */ + int cross_timestamping; + int rsv[13]; /* Reserved for future use. */ }; struct ptp_extts_request { @@ -81,6 +83,13 @@ struct ptp_sys_offset { struct ptp_clock_time ts[2 * PTP_MAX_SAMPLES + 1]; }; +struct ptp_sys_offset_precise { + struct ptp_clock_time device; + struct ptp_clock_time sys_realtime; + struct ptp_clock_time sys_monoraw; + unsigned int rsv[4]; /* Reserved for future use. */ +}; + enum ptp_pin_function { PTP_PF_NONE, PTP_PF_EXTTS, @@ -124,6 +133,8 @@ struct ptp_pin_desc { #define PTP_SYS_OFFSET _IOW(PTP_CLK_MAGIC, 5, struct ptp_sys_offset) #define PTP_PIN_GETFUNC _IOWR(PTP_CLK_MAGIC, 6, struct ptp_pin_desc) #define PTP_PIN_SETFUNC _IOW(PTP_CLK_MAGIC, 7, struct ptp_pin_desc) +#define PTP_SYS_OFFSET_PRECISE \ + _IOWR(PTP_CLK_MAGIC, 8, struct ptp_sys_offset_precise) struct ptp_extts_event { struct ptp_clock_time t; /* Time event occured. */ |