Merge tag 'fortglx/4.19/time-part2' of https://git.linaro.org/people/john.stultz/linux into timers/core
Pull the second set of timekeeping things for 4.19 from John Stultz
* NTP argument clenaups and constification from Ondrej Mosnacek
* Fix to avoid RTC injecting sleeptime when suspend fails from
Mukesh Ojha
* Broading suspsend-timing to include non-stop clocksources that
aren't currently used for timekeeping from Baolin Wang
hifive-unleashed-5.1
Thomas Gleixner
commit
e5af5ff34c
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@ -194,6 +194,9 @@ extern void clocksource_suspend(void);
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extern void clocksource_resume(void);
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extern struct clocksource * __init clocksource_default_clock(void);
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extern void clocksource_mark_unstable(struct clocksource *cs);
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extern void
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clocksource_start_suspend_timing(struct clocksource *cs, u64 start_cycles);
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extern u64 clocksource_stop_suspend_timing(struct clocksource *cs, u64 now);
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extern u64
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clocks_calc_max_nsecs(u32 mult, u32 shift, u32 maxadj, u64 mask, u64 *max_cycles);
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@ -177,7 +177,7 @@ static inline time64_t ktime_get_clocktai_seconds(void)
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extern bool timekeeping_rtc_skipsuspend(void);
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extern bool timekeeping_rtc_skipresume(void);
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extern void timekeeping_inject_sleeptime64(struct timespec64 *delta);
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extern void timekeeping_inject_sleeptime64(const struct timespec64 *delta);
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/*
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* struct system_time_snapshot - simultaneous raw/real time capture with
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@ -94,6 +94,8 @@ EXPORT_SYMBOL_GPL(clocks_calc_mult_shift);
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/*[Clocksource internal variables]---------
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* curr_clocksource:
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* currently selected clocksource.
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* suspend_clocksource:
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* used to calculate the suspend time.
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* clocksource_list:
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* linked list with the registered clocksources
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* clocksource_mutex:
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@ -102,10 +104,12 @@ EXPORT_SYMBOL_GPL(clocks_calc_mult_shift);
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* Name of the user-specified clocksource.
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*/
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static struct clocksource *curr_clocksource;
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static struct clocksource *suspend_clocksource;
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static LIST_HEAD(clocksource_list);
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static DEFINE_MUTEX(clocksource_mutex);
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static char override_name[CS_NAME_LEN];
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static int finished_booting;
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static u64 suspend_start;
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#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
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static void clocksource_watchdog_work(struct work_struct *work);
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@ -447,6 +451,140 @@ static inline void clocksource_watchdog_unlock(unsigned long *flags) { }
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#endif /* CONFIG_CLOCKSOURCE_WATCHDOG */
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static bool clocksource_is_suspend(struct clocksource *cs)
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{
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return cs == suspend_clocksource;
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}
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static void __clocksource_suspend_select(struct clocksource *cs)
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{
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/*
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* Skip the clocksource which will be stopped in suspend state.
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*/
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if (!(cs->flags & CLOCK_SOURCE_SUSPEND_NONSTOP))
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return;
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/*
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* The nonstop clocksource can be selected as the suspend clocksource to
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* calculate the suspend time, so it should not supply suspend/resume
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* interfaces to suspend the nonstop clocksource when system suspends.
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*/
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if (cs->suspend || cs->resume) {
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pr_warn("Nonstop clocksource %s should not supply suspend/resume interfaces\n",
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cs->name);
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}
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/* Pick the best rating. */
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if (!suspend_clocksource || cs->rating > suspend_clocksource->rating)
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suspend_clocksource = cs;
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}
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/**
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* clocksource_suspend_select - Select the best clocksource for suspend timing
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* @fallback: if select a fallback clocksource
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*/
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static void clocksource_suspend_select(bool fallback)
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{
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struct clocksource *cs, *old_suspend;
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old_suspend = suspend_clocksource;
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if (fallback)
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suspend_clocksource = NULL;
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list_for_each_entry(cs, &clocksource_list, list) {
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/* Skip current if we were requested for a fallback. */
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if (fallback && cs == old_suspend)
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continue;
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__clocksource_suspend_select(cs);
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}
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}
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/**
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* clocksource_start_suspend_timing - Start measuring the suspend timing
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* @cs: current clocksource from timekeeping
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* @start_cycles: current cycles from timekeeping
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*
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* This function will save the start cycle values of suspend timer to calculate
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* the suspend time when resuming system.
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*
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* This function is called late in the suspend process from timekeeping_suspend(),
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* that means processes are freezed, non-boot cpus and interrupts are disabled
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* now. It is therefore possible to start the suspend timer without taking the
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* clocksource mutex.
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*/
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void clocksource_start_suspend_timing(struct clocksource *cs, u64 start_cycles)
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{
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if (!suspend_clocksource)
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return;
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/*
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* If current clocksource is the suspend timer, we should use the
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* tkr_mono.cycle_last value as suspend_start to avoid same reading
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* from suspend timer.
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*/
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if (clocksource_is_suspend(cs)) {
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suspend_start = start_cycles;
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return;
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}
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if (suspend_clocksource->enable &&
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suspend_clocksource->enable(suspend_clocksource)) {
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pr_warn_once("Failed to enable the non-suspend-able clocksource.\n");
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return;
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}
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suspend_start = suspend_clocksource->read(suspend_clocksource);
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}
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/**
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* clocksource_stop_suspend_timing - Stop measuring the suspend timing
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* @cs: current clocksource from timekeeping
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* @cycle_now: current cycles from timekeeping
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*
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* This function will calculate the suspend time from suspend timer.
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*
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* Returns nanoseconds since suspend started, 0 if no usable suspend clocksource.
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*
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* This function is called early in the resume process from timekeeping_resume(),
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* that means there is only one cpu, no processes are running and the interrupts
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* are disabled. It is therefore possible to stop the suspend timer without
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* taking the clocksource mutex.
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*/
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u64 clocksource_stop_suspend_timing(struct clocksource *cs, u64 cycle_now)
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{
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u64 now, delta, nsec = 0;
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if (!suspend_clocksource)
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return 0;
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/*
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* If current clocksource is the suspend timer, we should use the
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* tkr_mono.cycle_last value from timekeeping as current cycle to
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* avoid same reading from suspend timer.
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*/
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if (clocksource_is_suspend(cs))
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now = cycle_now;
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else
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now = suspend_clocksource->read(suspend_clocksource);
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if (now > suspend_start) {
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delta = clocksource_delta(now, suspend_start,
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suspend_clocksource->mask);
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nsec = mul_u64_u32_shr(delta, suspend_clocksource->mult,
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suspend_clocksource->shift);
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}
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/*
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* Disable the suspend timer to save power if current clocksource is
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* not the suspend timer.
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*/
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if (!clocksource_is_suspend(cs) && suspend_clocksource->disable)
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suspend_clocksource->disable(suspend_clocksource);
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return nsec;
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}
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/**
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* clocksource_suspend - suspend the clocksource(s)
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*/
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@ -792,6 +930,7 @@ int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
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clocksource_select();
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clocksource_select_watchdog(false);
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__clocksource_suspend_select(cs);
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mutex_unlock(&clocksource_mutex);
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return 0;
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}
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@ -820,6 +959,7 @@ void clocksource_change_rating(struct clocksource *cs, int rating)
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clocksource_select();
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clocksource_select_watchdog(false);
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clocksource_suspend_select(false);
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mutex_unlock(&clocksource_mutex);
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}
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EXPORT_SYMBOL(clocksource_change_rating);
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@ -845,6 +985,15 @@ static int clocksource_unbind(struct clocksource *cs)
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return -EBUSY;
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}
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if (clocksource_is_suspend(cs)) {
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/*
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* Select and try to install a replacement suspend clocksource.
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* If no replacement suspend clocksource, we will just let the
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* clocksource go and have no suspend clocksource.
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*/
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clocksource_suspend_select(true);
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}
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clocksource_watchdog_lock(&flags);
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clocksource_dequeue_watchdog(cs);
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list_del_init(&cs->list);
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@ -642,7 +642,7 @@ void ntp_notify_cmos_timer(void)
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/*
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* Propagate a new txc->status value into the NTP state:
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*/
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static inline void process_adj_status(struct timex *txc, struct timespec64 *ts)
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static inline void process_adj_status(const struct timex *txc)
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{
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if ((time_status & STA_PLL) && !(txc->status & STA_PLL)) {
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time_state = TIME_OK;
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@ -665,12 +665,10 @@ static inline void process_adj_status(struct timex *txc, struct timespec64 *ts)
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}
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static inline void process_adjtimex_modes(struct timex *txc,
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struct timespec64 *ts,
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s32 *time_tai)
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static inline void process_adjtimex_modes(const struct timex *txc, s32 *time_tai)
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{
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if (txc->modes & ADJ_STATUS)
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process_adj_status(txc, ts);
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process_adj_status(txc);
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if (txc->modes & ADJ_NANO)
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time_status |= STA_NANO;
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@ -718,7 +716,7 @@ static inline void process_adjtimex_modes(struct timex *txc,
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* adjtimex mainly allows reading (and writing, if superuser) of
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* kernel time-keeping variables. used by xntpd.
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*/
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int __do_adjtimex(struct timex *txc, struct timespec64 *ts, s32 *time_tai)
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int __do_adjtimex(struct timex *txc, const struct timespec64 *ts, s32 *time_tai)
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{
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int result;
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@ -735,7 +733,7 @@ int __do_adjtimex(struct timex *txc, struct timespec64 *ts, s32 *time_tai)
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/* If there are input parameters, then process them: */
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if (txc->modes)
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process_adjtimex_modes(txc, ts, time_tai);
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process_adjtimex_modes(txc, time_tai);
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txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
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NTP_SCALE_SHIFT);
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@ -1022,12 +1020,11 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
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static int __init ntp_tick_adj_setup(char *str)
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{
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int rc = kstrtol(str, 0, (long *)&ntp_tick_adj);
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int rc = kstrtos64(str, 0, &ntp_tick_adj);
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if (rc)
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return rc;
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ntp_tick_adj <<= NTP_SCALE_SHIFT;
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ntp_tick_adj <<= NTP_SCALE_SHIFT;
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return 1;
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}
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@ -8,6 +8,6 @@ extern void ntp_clear(void);
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extern u64 ntp_tick_length(void);
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extern ktime_t ntp_get_next_leap(void);
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extern int second_overflow(time64_t secs);
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extern int __do_adjtimex(struct timex *, struct timespec64 *, s32 *);
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extern void __hardpps(const struct timespec64 *, const struct timespec64 *);
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extern int __do_adjtimex(struct timex *txc, const struct timespec64 *ts, s32 *time_tai);
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extern void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_ts);
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#endif /* _LINUX_NTP_INTERNAL_H */
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@ -105,7 +105,7 @@ static inline void tk_normalize_xtime(struct timekeeper *tk)
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}
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}
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static inline struct timespec64 tk_xtime(struct timekeeper *tk)
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static inline struct timespec64 tk_xtime(const struct timekeeper *tk)
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{
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struct timespec64 ts;
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@ -162,7 +162,7 @@ static inline void tk_update_sleep_time(struct timekeeper *tk, ktime_t delta)
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* a read of the fast-timekeeper tkrs (which is protected by its own locking
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* and update logic).
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*/
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static inline u64 tk_clock_read(struct tk_read_base *tkr)
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static inline u64 tk_clock_read(const struct tk_read_base *tkr)
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{
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struct clocksource *clock = READ_ONCE(tkr->clock);
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@ -211,7 +211,7 @@ static void timekeeping_check_update(struct timekeeper *tk, u64 offset)
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}
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}
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static inline u64 timekeeping_get_delta(struct tk_read_base *tkr)
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static inline u64 timekeeping_get_delta(const struct tk_read_base *tkr)
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{
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struct timekeeper *tk = &tk_core.timekeeper;
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u64 now, last, mask, max, delta;
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@ -255,7 +255,7 @@ static inline u64 timekeeping_get_delta(struct tk_read_base *tkr)
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static inline void timekeeping_check_update(struct timekeeper *tk, u64 offset)
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{
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}
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static inline u64 timekeeping_get_delta(struct tk_read_base *tkr)
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static inline u64 timekeeping_get_delta(const struct tk_read_base *tkr)
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{
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u64 cycle_now, delta;
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@ -352,7 +352,7 @@ u32 (*arch_gettimeoffset)(void) = default_arch_gettimeoffset;
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static inline u32 arch_gettimeoffset(void) { return 0; }
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#endif
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static inline u64 timekeeping_delta_to_ns(struct tk_read_base *tkr, u64 delta)
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static inline u64 timekeeping_delta_to_ns(const struct tk_read_base *tkr, u64 delta)
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{
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u64 nsec;
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@ -363,7 +363,7 @@ static inline u64 timekeeping_delta_to_ns(struct tk_read_base *tkr, u64 delta)
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return nsec + arch_gettimeoffset();
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}
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static inline u64 timekeeping_get_ns(struct tk_read_base *tkr)
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static inline u64 timekeeping_get_ns(const struct tk_read_base *tkr)
|
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{
|
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u64 delta;
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|
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|
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@ -371,7 +371,7 @@ static inline u64 timekeeping_get_ns(struct tk_read_base *tkr)
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return timekeeping_delta_to_ns(tkr, delta);
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}
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|
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static inline u64 timekeeping_cycles_to_ns(struct tk_read_base *tkr, u64 cycles)
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static inline u64 timekeeping_cycles_to_ns(const struct tk_read_base *tkr, u64 cycles)
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{
|
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u64 delta;
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|
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|
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@ -394,7 +394,8 @@ static inline u64 timekeeping_cycles_to_ns(struct tk_read_base *tkr, u64 cycles)
|
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* slightly wrong timestamp (a few nanoseconds). See
|
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* @ktime_get_mono_fast_ns.
|
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*/
|
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static void update_fast_timekeeper(struct tk_read_base *tkr, struct tk_fast *tkf)
|
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static void update_fast_timekeeper(const struct tk_read_base *tkr,
|
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struct tk_fast *tkf)
|
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{
|
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struct tk_read_base *base = tkf->base;
|
||||
|
||||
|
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@ -549,10 +550,10 @@ EXPORT_SYMBOL_GPL(ktime_get_real_fast_ns);
|
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* number of cycles every time until timekeeping is resumed at which time the
|
||||
* proper readout base for the fast timekeeper will be restored automatically.
|
||||
*/
|
||||
static void halt_fast_timekeeper(struct timekeeper *tk)
|
||||
static void halt_fast_timekeeper(const struct timekeeper *tk)
|
||||
{
|
||||
static struct tk_read_base tkr_dummy;
|
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struct tk_read_base *tkr = &tk->tkr_mono;
|
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const struct tk_read_base *tkr = &tk->tkr_mono;
|
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|
||||
memcpy(&tkr_dummy, tkr, sizeof(tkr_dummy));
|
||||
cycles_at_suspend = tk_clock_read(tkr);
|
||||
|
|
@ -1277,7 +1278,7 @@ EXPORT_SYMBOL(do_settimeofday64);
|
|||
*
|
||||
* Adds or subtracts an offset value from the current time.
|
||||
*/
|
||||
static int timekeeping_inject_offset(struct timespec64 *ts)
|
||||
static int timekeeping_inject_offset(const struct timespec64 *ts)
|
||||
{
|
||||
struct timekeeper *tk = &tk_core.timekeeper;
|
||||
unsigned long flags;
|
||||
|
|
@ -1518,8 +1519,20 @@ void __weak read_boot_clock64(struct timespec64 *ts)
|
|||
ts->tv_nsec = 0;
|
||||
}
|
||||
|
||||
/* Flag for if timekeeping_resume() has injected sleeptime */
|
||||
static bool sleeptime_injected;
|
||||
/*
|
||||
* Flag reflecting whether timekeeping_resume() has injected sleeptime.
|
||||
*
|
||||
* The flag starts of false and is only set when a suspend reaches
|
||||
* timekeeping_suspend(), timekeeping_resume() sets it to false when the
|
||||
* timekeeper clocksource is not stopping across suspend and has been
|
||||
* used to update sleep time. If the timekeeper clocksource has stopped
|
||||
* then the flag stays true and is used by the RTC resume code to decide
|
||||
* whether sleeptime must be injected and if so the flag gets false then.
|
||||
*
|
||||
* If a suspend fails before reaching timekeeping_resume() then the flag
|
||||
* stays false and prevents erroneous sleeptime injection.
|
||||
*/
|
||||
static bool suspend_timing_needed;
|
||||
|
||||
/* Flag for if there is a persistent clock on this platform */
|
||||
static bool persistent_clock_exists;
|
||||
|
|
@ -1585,7 +1598,7 @@ static struct timespec64 timekeeping_suspend_time;
|
|||
* adds the sleep offset to the timekeeping variables.
|
||||
*/
|
||||
static void __timekeeping_inject_sleeptime(struct timekeeper *tk,
|
||||
struct timespec64 *delta)
|
||||
const struct timespec64 *delta)
|
||||
{
|
||||
if (!timespec64_valid_strict(delta)) {
|
||||
printk_deferred(KERN_WARNING
|
||||
|
|
@ -1618,7 +1631,7 @@ static void __timekeeping_inject_sleeptime(struct timekeeper *tk,
|
|||
*/
|
||||
bool timekeeping_rtc_skipresume(void)
|
||||
{
|
||||
return sleeptime_injected;
|
||||
return !suspend_timing_needed;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -1646,7 +1659,7 @@ bool timekeeping_rtc_skipsuspend(void)
|
|||
* This function should only be called by rtc_resume(), and allows
|
||||
* a suspend offset to be injected into the timekeeping values.
|
||||
*/
|
||||
void timekeeping_inject_sleeptime64(struct timespec64 *delta)
|
||||
void timekeeping_inject_sleeptime64(const struct timespec64 *delta)
|
||||
{
|
||||
struct timekeeper *tk = &tk_core.timekeeper;
|
||||
unsigned long flags;
|
||||
|
|
@ -1654,6 +1667,8 @@ void timekeeping_inject_sleeptime64(struct timespec64 *delta)
|
|||
raw_spin_lock_irqsave(&timekeeper_lock, flags);
|
||||
write_seqcount_begin(&tk_core.seq);
|
||||
|
||||
suspend_timing_needed = false;
|
||||
|
||||
timekeeping_forward_now(tk);
|
||||
|
||||
__timekeeping_inject_sleeptime(tk, delta);
|
||||
|
|
@ -1677,9 +1692,9 @@ void timekeeping_resume(void)
|
|||
struct clocksource *clock = tk->tkr_mono.clock;
|
||||
unsigned long flags;
|
||||
struct timespec64 ts_new, ts_delta;
|
||||
u64 cycle_now;
|
||||
u64 cycle_now, nsec;
|
||||
bool inject_sleeptime = false;
|
||||
|
||||
sleeptime_injected = false;
|
||||
read_persistent_clock64(&ts_new);
|
||||
|
||||
clockevents_resume();
|
||||
|
|
@ -1701,22 +1716,19 @@ void timekeeping_resume(void)
|
|||
* usable source. The rtc part is handled separately in rtc core code.
|
||||
*/
|
||||
cycle_now = tk_clock_read(&tk->tkr_mono);
|
||||
if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) &&
|
||||
cycle_now > tk->tkr_mono.cycle_last) {
|
||||
u64 nsec, cyc_delta;
|
||||
|
||||
cyc_delta = clocksource_delta(cycle_now, tk->tkr_mono.cycle_last,
|
||||
tk->tkr_mono.mask);
|
||||
nsec = mul_u64_u32_shr(cyc_delta, clock->mult, clock->shift);
|
||||
nsec = clocksource_stop_suspend_timing(clock, cycle_now);
|
||||
if (nsec > 0) {
|
||||
ts_delta = ns_to_timespec64(nsec);
|
||||
sleeptime_injected = true;
|
||||
inject_sleeptime = true;
|
||||
} else if (timespec64_compare(&ts_new, &timekeeping_suspend_time) > 0) {
|
||||
ts_delta = timespec64_sub(ts_new, timekeeping_suspend_time);
|
||||
sleeptime_injected = true;
|
||||
inject_sleeptime = true;
|
||||
}
|
||||
|
||||
if (sleeptime_injected)
|
||||
if (inject_sleeptime) {
|
||||
suspend_timing_needed = false;
|
||||
__timekeeping_inject_sleeptime(tk, &ts_delta);
|
||||
}
|
||||
|
||||
/* Re-base the last cycle value */
|
||||
tk->tkr_mono.cycle_last = cycle_now;
|
||||
|
|
@ -1740,6 +1752,8 @@ int timekeeping_suspend(void)
|
|||
unsigned long flags;
|
||||
struct timespec64 delta, delta_delta;
|
||||
static struct timespec64 old_delta;
|
||||
struct clocksource *curr_clock;
|
||||
u64 cycle_now;
|
||||
|
||||
read_persistent_clock64(&timekeeping_suspend_time);
|
||||
|
||||
|
|
@ -1751,11 +1765,22 @@ int timekeeping_suspend(void)
|
|||
if (timekeeping_suspend_time.tv_sec || timekeeping_suspend_time.tv_nsec)
|
||||
persistent_clock_exists = true;
|
||||
|
||||
suspend_timing_needed = true;
|
||||
|
||||
raw_spin_lock_irqsave(&timekeeper_lock, flags);
|
||||
write_seqcount_begin(&tk_core.seq);
|
||||
timekeeping_forward_now(tk);
|
||||
timekeeping_suspended = 1;
|
||||
|
||||
/*
|
||||
* Since we've called forward_now, cycle_last stores the value
|
||||
* just read from the current clocksource. Save this to potentially
|
||||
* use in suspend timing.
|
||||
*/
|
||||
curr_clock = tk->tkr_mono.clock;
|
||||
cycle_now = tk->tkr_mono.cycle_last;
|
||||
clocksource_start_suspend_timing(curr_clock, cycle_now);
|
||||
|
||||
if (persistent_clock_exists) {
|
||||
/*
|
||||
* To avoid drift caused by repeated suspend/resumes,
|
||||
|
|
@ -2240,7 +2265,7 @@ ktime_t ktime_get_update_offsets_now(unsigned int *cwsseq, ktime_t *offs_real,
|
|||
/**
|
||||
* timekeeping_validate_timex - Ensures the timex is ok for use in do_adjtimex
|
||||
*/
|
||||
static int timekeeping_validate_timex(struct timex *txc)
|
||||
static int timekeeping_validate_timex(const struct timex *txc)
|
||||
{
|
||||
if (txc->modes & ADJ_ADJTIME) {
|
||||
/* singleshot must not be used with any other mode bits */
|
||||
|
|
|
|||
|
|
@ -70,7 +70,7 @@ static int __init tk_debug_sleep_time_init(void)
|
|||
}
|
||||
late_initcall(tk_debug_sleep_time_init);
|
||||
|
||||
void tk_debug_account_sleep_time(struct timespec64 *t)
|
||||
void tk_debug_account_sleep_time(const struct timespec64 *t)
|
||||
{
|
||||
/* Cap bin index so we don't overflow the array */
|
||||
int bin = min(fls(t->tv_sec), NUM_BINS-1);
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
#include <linux/time.h>
|
||||
|
||||
#ifdef CONFIG_DEBUG_FS
|
||||
extern void tk_debug_account_sleep_time(struct timespec64 *t);
|
||||
extern void tk_debug_account_sleep_time(const struct timespec64 *t);
|
||||
#else
|
||||
#define tk_debug_account_sleep_time(x)
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in New Issue