mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
14a3b6abe9
For implementing a shadow timekeeper and a split calculation/update region we need to store the cycle_last value in the timekeeper and update the value in the clocksource struct only in the update region. Add the extra storage to the timekeeper. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/*
|
|
* You SHOULD NOT be including this unless you're vsyscall
|
|
* handling code or timekeeping internal code!
|
|
*/
|
|
|
|
#ifndef _LINUX_TIMEKEEPER_INTERNAL_H
|
|
#define _LINUX_TIMEKEEPER_INTERNAL_H
|
|
|
|
#include <linux/clocksource.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/time.h>
|
|
|
|
/* Structure holding internal timekeeping values. */
|
|
struct timekeeper {
|
|
/* Current clocksource used for timekeeping. */
|
|
struct clocksource *clock;
|
|
/* NTP adjusted clock multiplier */
|
|
u32 mult;
|
|
/* The shift value of the current clocksource. */
|
|
u32 shift;
|
|
/* Number of clock cycles in one NTP interval. */
|
|
cycle_t cycle_interval;
|
|
/* Last cycle value (also stored in clock->cycle_last) */
|
|
cycle_t cycle_last;
|
|
/* Number of clock shifted nano seconds in one NTP interval. */
|
|
u64 xtime_interval;
|
|
/* shifted nano seconds left over when rounding cycle_interval */
|
|
s64 xtime_remainder;
|
|
/* Raw nano seconds accumulated per NTP interval. */
|
|
u32 raw_interval;
|
|
|
|
/* Current CLOCK_REALTIME time in seconds */
|
|
u64 xtime_sec;
|
|
/* Clock shifted nano seconds */
|
|
u64 xtime_nsec;
|
|
|
|
/* Difference between accumulated time and NTP time in ntp
|
|
* shifted nano seconds. */
|
|
s64 ntp_error;
|
|
/* Shift conversion between clock shifted nano seconds and
|
|
* ntp shifted nano seconds. */
|
|
u32 ntp_error_shift;
|
|
|
|
/*
|
|
* wall_to_monotonic is what we need to add to xtime (or xtime corrected
|
|
* for sub jiffie times) to get to monotonic time. Monotonic is pegged
|
|
* at zero at system boot time, so wall_to_monotonic will be negative,
|
|
* however, we will ALWAYS keep the tv_nsec part positive so we can use
|
|
* the usual normalization.
|
|
*
|
|
* wall_to_monotonic is moved after resume from suspend for the
|
|
* monotonic time not to jump. We need to add total_sleep_time to
|
|
* wall_to_monotonic to get the real boot based time offset.
|
|
*
|
|
* - wall_to_monotonic is no longer the boot time, getboottime must be
|
|
* used instead.
|
|
*/
|
|
struct timespec wall_to_monotonic;
|
|
/* Offset clock monotonic -> clock realtime */
|
|
ktime_t offs_real;
|
|
/* time spent in suspend */
|
|
struct timespec total_sleep_time;
|
|
/* Offset clock monotonic -> clock boottime */
|
|
ktime_t offs_boot;
|
|
/* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
|
|
struct timespec raw_time;
|
|
/* The current UTC to TAI offset in seconds */
|
|
s32 tai_offset;
|
|
/* Offset clock monotonic -> clock tai */
|
|
ktime_t offs_tai;
|
|
|
|
};
|
|
|
|
static inline struct timespec tk_xtime(struct timekeeper *tk)
|
|
{
|
|
struct timespec ts;
|
|
|
|
ts.tv_sec = tk->xtime_sec;
|
|
ts.tv_nsec = (long)(tk->xtime_nsec >> tk->shift);
|
|
return ts;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_GENERIC_TIME_VSYSCALL
|
|
|
|
extern void update_vsyscall(struct timekeeper *tk);
|
|
extern void update_vsyscall_tz(void);
|
|
|
|
#elif defined(CONFIG_GENERIC_TIME_VSYSCALL_OLD)
|
|
|
|
extern void update_vsyscall_old(struct timespec *ts, struct timespec *wtm,
|
|
struct clocksource *c, u32 mult);
|
|
extern void update_vsyscall_tz(void);
|
|
|
|
static inline void update_vsyscall(struct timekeeper *tk)
|
|
{
|
|
struct timespec xt;
|
|
|
|
xt = tk_xtime(tk);
|
|
update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void update_vsyscall(struct timekeeper *tk)
|
|
{
|
|
}
|
|
static inline void update_vsyscall_tz(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#endif /* _LINUX_TIMEKEEPER_INTERNAL_H */
|