mirror of
https://github.com/edk2-porting/linux-next.git
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a3ed0e4393
Revert commits92af4dcb4e
("tracing: Unify the "boot" and "mono" tracing clocks")127bfa5f43
("hrtimer: Unify MONOTONIC and BOOTTIME clock behavior")7250a4047a
("posix-timers: Unify MONOTONIC and BOOTTIME clock behavior")d6c7270e91
("timekeeping: Remove boot time specific code")f2d6fdbfd2
("Input: Evdev - unify MONOTONIC and BOOTTIME clock behavior")d6ed449afd
("timekeeping: Make the MONOTONIC clock behave like the BOOTTIME clock")72199320d4
("timekeeping: Add the new CLOCK_MONOTONIC_ACTIVE clock") As stated in the pull request for the unification of CLOCK_MONOTONIC and CLOCK_BOOTTIME, it was clear that we might have to revert the change. As reported by several folks systemd and other applications rely on the documented behaviour of CLOCK_MONOTONIC on Linux and break with the above changes. After resume daemons time out and other timeout related issues are observed. Rafael compiled this list: * systemd kills daemons on resume, after >WatchdogSec seconds of suspending (Genki Sky). [Verified that that's because systemd uses CLOCK_MONOTONIC and expects it to not include the suspend time.] * systemd-journald misbehaves after resume: systemd-journald[7266]: File /var/log/journal/016627c3c4784cd4812d4b7e96a34226/system.journal corrupted or uncleanly shut down, renaming and replacing. (Mike Galbraith). * NetworkManager reports "networking disabled" and networking is broken after resume 50% of the time (Pavel). [May be because of systemd.] * MATE desktop dims the display and starts the screensaver right after system resume (Pavel). * Full system hang during resume (me). [May be due to systemd or NM or both.] That happens on debian and open suse systems. It's sad, that these problems were neither catched in -next nor by those folks who expressed interest in this change. Reported-by: Rafael J. Wysocki <rjw@rjwysocki.net> Reported-by: Genki Sky <sky@genki.is>, Reported-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: John Stultz <john.stultz@linaro.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Kevin Easton <kevin@guarana.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mark Salyzyn <salyzyn@android.com> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Petr Mladek <pmladek@suse.com> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org>
152 lines
5.1 KiB
C
152 lines
5.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* You SHOULD NOT be including this unless you're vsyscall
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* handling code or timekeeping internal code!
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*/
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#ifndef _LINUX_TIMEKEEPER_INTERNAL_H
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#define _LINUX_TIMEKEEPER_INTERNAL_H
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#include <linux/clocksource.h>
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#include <linux/jiffies.h>
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#include <linux/time.h>
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/**
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* struct tk_read_base - base structure for timekeeping readout
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* @clock: Current clocksource used for timekeeping.
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* @mask: Bitmask for two's complement subtraction of non 64bit clocks
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* @cycle_last: @clock cycle value at last update
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* @mult: (NTP adjusted) multiplier for scaled math conversion
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* @shift: Shift value for scaled math conversion
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* @xtime_nsec: Shifted (fractional) nano seconds offset for readout
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* @base: ktime_t (nanoseconds) base time for readout
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* @base_real: Nanoseconds base value for clock REALTIME readout
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*
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* This struct has size 56 byte on 64 bit. Together with a seqcount it
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* occupies a single 64byte cache line.
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*
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* The struct is separate from struct timekeeper as it is also used
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* for a fast NMI safe accessors.
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*
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* @base_real is for the fast NMI safe accessor to allow reading clock
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* realtime from any context.
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*/
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struct tk_read_base {
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struct clocksource *clock;
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u64 mask;
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u64 cycle_last;
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u32 mult;
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u32 shift;
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u64 xtime_nsec;
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ktime_t base;
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u64 base_real;
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};
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/**
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* struct timekeeper - Structure holding internal timekeeping values.
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* @tkr_mono: The readout base structure for CLOCK_MONOTONIC
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* @tkr_raw: The readout base structure for CLOCK_MONOTONIC_RAW
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* @xtime_sec: Current CLOCK_REALTIME time in seconds
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* @ktime_sec: Current CLOCK_MONOTONIC time in seconds
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* @wall_to_monotonic: CLOCK_REALTIME to CLOCK_MONOTONIC offset
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* @offs_real: Offset clock monotonic -> clock realtime
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* @offs_boot: Offset clock monotonic -> clock boottime
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* @offs_tai: Offset clock monotonic -> clock tai
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* @tai_offset: The current UTC to TAI offset in seconds
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* @clock_was_set_seq: The sequence number of clock was set events
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* @cs_was_changed_seq: The sequence number of clocksource change events
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* @next_leap_ktime: CLOCK_MONOTONIC time value of a pending leap-second
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* @raw_sec: CLOCK_MONOTONIC_RAW time in seconds
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* @cycle_interval: Number of clock cycles in one NTP interval
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* @xtime_interval: Number of clock shifted nano seconds in one NTP
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* interval.
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* @xtime_remainder: Shifted nano seconds left over when rounding
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* @cycle_interval
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* @raw_interval: Shifted raw nano seconds accumulated per NTP interval.
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* @ntp_error: Difference between accumulated time and NTP time in ntp
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* shifted nano seconds.
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* @ntp_error_shift: Shift conversion between clock shifted nano seconds and
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* ntp shifted nano seconds.
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* @last_warning: Warning ratelimiter (DEBUG_TIMEKEEPING)
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* @underflow_seen: Underflow warning flag (DEBUG_TIMEKEEPING)
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* @overflow_seen: Overflow warning flag (DEBUG_TIMEKEEPING)
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*
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* Note: For timespec(64) based interfaces wall_to_monotonic is what
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* we need to add to xtime (or xtime corrected for sub jiffie times)
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* to get to monotonic time. Monotonic is pegged at zero at system
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* boot time, so wall_to_monotonic will be negative, however, we will
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* ALWAYS keep the tv_nsec part positive so we can use the usual
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* normalization.
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*
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* wall_to_monotonic is moved after resume from suspend for the
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* monotonic time not to jump. We need to add total_sleep_time to
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* wall_to_monotonic to get the real boot based time offset.
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*
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* wall_to_monotonic is no longer the boot time, getboottime must be
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* used instead.
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*/
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struct timekeeper {
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struct tk_read_base tkr_mono;
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struct tk_read_base tkr_raw;
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u64 xtime_sec;
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unsigned long ktime_sec;
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struct timespec64 wall_to_monotonic;
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ktime_t offs_real;
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ktime_t offs_boot;
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ktime_t offs_tai;
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s32 tai_offset;
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unsigned int clock_was_set_seq;
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u8 cs_was_changed_seq;
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ktime_t next_leap_ktime;
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u64 raw_sec;
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/* The following members are for timekeeping internal use */
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u64 cycle_interval;
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u64 xtime_interval;
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s64 xtime_remainder;
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u64 raw_interval;
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/* The ntp_tick_length() value currently being used.
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* This cached copy ensures we consistently apply the tick
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* length for an entire tick, as ntp_tick_length may change
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* mid-tick, and we don't want to apply that new value to
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* the tick in progress.
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*/
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u64 ntp_tick;
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/* Difference between accumulated time and NTP time in ntp
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* shifted nano seconds. */
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s64 ntp_error;
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u32 ntp_error_shift;
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u32 ntp_err_mult;
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/* Flag used to avoid updating NTP twice with same second */
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u32 skip_second_overflow;
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#ifdef CONFIG_DEBUG_TIMEKEEPING
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long last_warning;
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/*
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* These simple flag variables are managed
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* without locks, which is racy, but they are
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* ok since we don't really care about being
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* super precise about how many events were
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* seen, just that a problem was observed.
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*/
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int underflow_seen;
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int overflow_seen;
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#endif
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};
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#ifdef CONFIG_GENERIC_TIME_VSYSCALL
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extern void update_vsyscall(struct timekeeper *tk);
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extern void update_vsyscall_tz(void);
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#else
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static inline void update_vsyscall(struct timekeeper *tk)
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{
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}
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static inline void update_vsyscall_tz(void)
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{
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}
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#endif
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#endif /* _LINUX_TIMEKEEPER_INTERNAL_H */
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