2006-01-10 05:52:32 +01:00
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/*
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* linux/kernel/hrtimer.c
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*
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2007-02-16 10:27:50 +01:00
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* Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
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2007-02-16 10:28:03 +01:00
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* Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
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* Copyright(C) 2006-2007 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
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2006-01-10 05:52:32 +01:00
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*
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* High-resolution kernel timers
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*
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* In contrast to the low-resolution timeout API implemented in
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* kernel/timer.c, hrtimers provide finer resolution and accuracy
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* depending on system configuration and capabilities.
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*
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* These timers are currently used for:
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* - itimers
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* - POSIX timers
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* - nanosleep
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* - precise in-kernel timing
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*
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* Started by: Thomas Gleixner and Ingo Molnar
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*
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* Credits:
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* based on kernel/timer.c
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*
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2006-02-01 12:05:13 +01:00
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* Help, testing, suggestions, bugfixes, improvements were
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* provided by:
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*
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* George Anzinger, Andrew Morton, Steven Rostedt, Roman Zippel
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* et. al.
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*
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2006-01-10 05:52:32 +01:00
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* For licencing details see kernel-base/COPYING
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*/
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#include <linux/cpu.h>
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#include <linux/module.h>
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#include <linux/percpu.h>
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#include <linux/hrtimer.h>
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#include <linux/notifier.h>
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#include <linux/syscalls.h>
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#include <linux/interrupt.h>
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2007-02-16 10:28:03 +01:00
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#include <linux/tick.h>
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2006-01-10 05:52:32 +01:00
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#include <asm/uaccess.h>
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/**
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* ktime_get - get the monotonic time in ktime_t format
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*
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* returns the time in ktime_t format
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*/
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2007-02-16 10:28:00 +01:00
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ktime_t ktime_get(void)
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2006-01-10 05:52:32 +01:00
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{
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struct timespec now;
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ktime_get_ts(&now);
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return timespec_to_ktime(now);
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}
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/**
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* ktime_get_real - get the real (wall-) time in ktime_t format
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*
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* returns the time in ktime_t format
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*/
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2007-02-16 10:28:00 +01:00
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ktime_t ktime_get_real(void)
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2006-01-10 05:52:32 +01:00
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{
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struct timespec now;
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getnstimeofday(&now);
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return timespec_to_ktime(now);
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}
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EXPORT_SYMBOL_GPL(ktime_get_real);
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/*
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* The timer bases:
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2006-02-01 12:05:11 +01:00
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*
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* Note: If we want to add new timer bases, we have to skip the two
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* clock ids captured by the cpu-timers. We do this by holding empty
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* entries rather than doing math adjustment of the clock ids.
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* This ensures that we capture erroneous accesses to these clock ids
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* rather than moving them into the range of valid clock id's.
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2006-01-10 05:52:32 +01:00
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*/
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2007-02-16 10:27:50 +01:00
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static DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) =
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2006-01-10 05:52:32 +01:00
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{
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2007-02-16 10:27:50 +01:00
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.clock_base =
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2006-01-10 05:52:32 +01:00
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{
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2007-02-16 10:27:50 +01:00
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{
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.index = CLOCK_REALTIME,
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.get_time = &ktime_get_real,
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.resolution = KTIME_REALTIME_RES,
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},
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{
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.index = CLOCK_MONOTONIC,
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.get_time = &ktime_get,
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.resolution = KTIME_MONOTONIC_RES,
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},
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}
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2006-01-10 05:52:32 +01:00
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};
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/**
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* ktime_get_ts - get the monotonic clock in timespec format
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* @ts: pointer to timespec variable
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*
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* The function calculates the monotonic clock from the realtime
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* clock and the wall_to_monotonic offset and stores the result
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2007-02-10 10:45:59 +01:00
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* in normalized timespec format in the variable pointed to by @ts.
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2006-01-10 05:52:32 +01:00
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*/
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void ktime_get_ts(struct timespec *ts)
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{
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struct timespec tomono;
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unsigned long seq;
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do {
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seq = read_seqbegin(&xtime_lock);
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getnstimeofday(ts);
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tomono = wall_to_monotonic;
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} while (read_seqretry(&xtime_lock, seq));
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set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec,
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ts->tv_nsec + tomono.tv_nsec);
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}
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2006-01-10 05:52:39 +01:00
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EXPORT_SYMBOL_GPL(ktime_get_ts);
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2006-01-10 05:52:32 +01:00
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2006-03-26 11:38:05 +02:00
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/*
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* Get the coarse grained time at the softirq based on xtime and
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* wall_to_monotonic.
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*/
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2007-02-16 10:27:50 +01:00
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static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
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2006-03-26 11:38:05 +02:00
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{
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ktime_t xtim, tomono;
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2007-02-16 10:27:26 +01:00
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struct timespec xts;
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2006-03-26 11:38:05 +02:00
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unsigned long seq;
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do {
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seq = read_seqbegin(&xtime_lock);
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2007-02-16 10:27:26 +01:00
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#ifdef CONFIG_NO_HZ
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getnstimeofday(&xts);
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#else
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xts = xtime;
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#endif
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2006-03-26 11:38:05 +02:00
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} while (read_seqretry(&xtime_lock, seq));
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2007-02-16 10:27:26 +01:00
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xtim = timespec_to_ktime(xts);
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tomono = timespec_to_ktime(wall_to_monotonic);
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2007-02-16 10:27:50 +01:00
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base->clock_base[CLOCK_REALTIME].softirq_time = xtim;
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base->clock_base[CLOCK_MONOTONIC].softirq_time =
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ktime_add(xtim, tomono);
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2006-03-26 11:38:05 +02:00
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}
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2007-02-16 10:27:51 +01:00
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/*
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* Helper function to check, whether the timer is on one of the queues
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*/
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static inline int hrtimer_is_queued(struct hrtimer *timer)
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{
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return timer->state & HRTIMER_STATE_ENQUEUED;
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}
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/*
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* Helper function to check, whether the timer is running the callback
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* function
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*/
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static inline int hrtimer_callback_running(struct hrtimer *timer)
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{
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return timer->state & HRTIMER_STATE_CALLBACK;
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}
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2006-01-10 05:52:32 +01:00
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/*
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* Functions and macros which are different for UP/SMP systems are kept in a
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* single place
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*/
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#ifdef CONFIG_SMP
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/*
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* We are using hashed locking: holding per_cpu(hrtimer_bases)[n].lock
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* means that all timers which are tied to this base via timer->base are
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* locked, and the base itself is locked too.
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*
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* So __run_timers/migrate_timers can safely modify all timers which could
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* be found on the lists/queues.
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*
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* When the timer's base is locked, and the timer removed from list, it is
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* possible to set timer->base = NULL and drop the lock: the timer remains
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* locked.
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*/
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2007-02-16 10:27:50 +01:00
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static
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struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer,
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unsigned long *flags)
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2006-01-10 05:52:32 +01:00
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{
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2007-02-16 10:27:50 +01:00
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struct hrtimer_clock_base *base;
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2006-01-10 05:52:32 +01:00
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for (;;) {
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base = timer->base;
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if (likely(base != NULL)) {
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2007-02-16 10:27:50 +01:00
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spin_lock_irqsave(&base->cpu_base->lock, *flags);
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2006-01-10 05:52:32 +01:00
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if (likely(base == timer->base))
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return base;
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/* The timer has migrated to another CPU: */
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2007-02-16 10:27:50 +01:00
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spin_unlock_irqrestore(&base->cpu_base->lock, *flags);
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2006-01-10 05:52:32 +01:00
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}
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cpu_relax();
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}
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}
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/*
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* Switch the timer base to the current CPU when possible.
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*/
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2007-02-16 10:27:50 +01:00
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static inline struct hrtimer_clock_base *
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switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base)
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2006-01-10 05:52:32 +01:00
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{
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2007-02-16 10:27:50 +01:00
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struct hrtimer_clock_base *new_base;
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struct hrtimer_cpu_base *new_cpu_base;
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2006-01-10 05:52:32 +01:00
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2007-02-16 10:27:50 +01:00
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new_cpu_base = &__get_cpu_var(hrtimer_bases);
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new_base = &new_cpu_base->clock_base[base->index];
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2006-01-10 05:52:32 +01:00
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if (base != new_base) {
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/*
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* We are trying to schedule the timer on the local CPU.
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* However we can't change timer's base while it is running,
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* so we keep it on the same CPU. No hassle vs. reprogramming
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* the event source in the high resolution case. The softirq
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* code will take care of this when the timer function has
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* completed. There is no conflict as we hold the lock until
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* the timer is enqueued.
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*/
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2007-02-16 10:27:52 +01:00
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if (unlikely(timer->state & HRTIMER_STATE_CALLBACK))
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2006-01-10 05:52:32 +01:00
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return base;
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/* See the comment in lock_timer_base() */
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timer->base = NULL;
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2007-02-16 10:27:50 +01:00
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spin_unlock(&base->cpu_base->lock);
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spin_lock(&new_base->cpu_base->lock);
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2006-01-10 05:52:32 +01:00
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timer->base = new_base;
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}
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return new_base;
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}
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#else /* CONFIG_SMP */
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2007-02-16 10:27:50 +01:00
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static inline struct hrtimer_clock_base *
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2006-01-10 05:52:32 +01:00
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lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
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{
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2007-02-16 10:27:50 +01:00
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struct hrtimer_clock_base *base = timer->base;
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2006-01-10 05:52:32 +01:00
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2007-02-16 10:27:50 +01:00
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spin_lock_irqsave(&base->cpu_base->lock, *flags);
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2006-01-10 05:52:32 +01:00
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return base;
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}
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#define switch_hrtimer_base(t, b) (b)
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#endif /* !CONFIG_SMP */
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/*
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* Functions for the union type storage format of ktime_t which are
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* too large for inlining:
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*/
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#if BITS_PER_LONG < 64
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# ifndef CONFIG_KTIME_SCALAR
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/**
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* ktime_add_ns - Add a scalar nanoseconds value to a ktime_t variable
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* @kt: addend
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* @nsec: the scalar nsec value to add
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*
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* Returns the sum of kt and nsec in ktime_t format
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*/
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ktime_t ktime_add_ns(const ktime_t kt, u64 nsec)
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{
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ktime_t tmp;
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if (likely(nsec < NSEC_PER_SEC)) {
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tmp.tv64 = nsec;
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} else {
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unsigned long rem = do_div(nsec, NSEC_PER_SEC);
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tmp = ktime_set((long)nsec, rem);
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}
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return ktime_add(kt, tmp);
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}
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#else /* CONFIG_KTIME_SCALAR */
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# endif /* !CONFIG_KTIME_SCALAR */
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/*
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* Divide a ktime value by a nanosecond value
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*/
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2007-02-16 10:28:03 +01:00
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unsigned long ktime_divns(const ktime_t kt, s64 div)
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2006-01-10 05:52:32 +01:00
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{
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u64 dclc, inc, dns;
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int sft = 0;
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dclc = dns = ktime_to_ns(kt);
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inc = div;
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/* Make sure the divisor is less than 2^32: */
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while (div >> 32) {
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sft++;
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div >>= 1;
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}
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dclc >>= sft;
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do_div(dclc, (unsigned long) div);
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return (unsigned long) dclc;
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}
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#endif /* BITS_PER_LONG >= 64 */
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/*
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* Counterpart to lock_timer_base above:
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*/
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static inline
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void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
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{
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2007-02-16 10:27:50 +01:00
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spin_unlock_irqrestore(&timer->base->cpu_base->lock, *flags);
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2006-01-10 05:52:32 +01:00
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}
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/**
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* hrtimer_forward - forward the timer expiry
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* @timer: hrtimer to forward
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2006-03-26 11:38:06 +02:00
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* @now: forward past this time
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2006-01-10 05:52:32 +01:00
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* @interval: the interval to forward
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*
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* Forward the timer expiry so it will expire in the future.
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2006-01-16 23:58:55 +01:00
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* Returns the number of overruns.
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2006-01-10 05:52:32 +01:00
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*/
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unsigned long
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2006-03-26 11:38:06 +02:00
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hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
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2006-01-10 05:52:32 +01:00
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{
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unsigned long orun = 1;
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2006-03-26 11:38:06 +02:00
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ktime_t delta;
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2006-01-10 05:52:32 +01:00
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|
|
delta = ktime_sub(now, timer->expires);
|
|
|
|
|
|
|
|
if (delta.tv64 < 0)
|
|
|
|
return 0;
|
|
|
|
|
2006-01-12 11:47:34 +01:00
|
|
|
if (interval.tv64 < timer->base->resolution.tv64)
|
|
|
|
interval.tv64 = timer->base->resolution.tv64;
|
|
|
|
|
2006-01-10 05:52:32 +01:00
|
|
|
if (unlikely(delta.tv64 >= interval.tv64)) {
|
2006-03-26 11:38:11 +02:00
|
|
|
s64 incr = ktime_to_ns(interval);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
|
|
|
orun = ktime_divns(delta, incr);
|
|
|
|
timer->expires = ktime_add_ns(timer->expires, incr * orun);
|
|
|
|
if (timer->expires.tv64 > now.tv64)
|
|
|
|
return orun;
|
|
|
|
/*
|
|
|
|
* This (and the ktime_add() below) is the
|
|
|
|
* correction for exact:
|
|
|
|
*/
|
|
|
|
orun++;
|
|
|
|
}
|
|
|
|
timer->expires = ktime_add(timer->expires, interval);
|
|
|
|
|
|
|
|
return orun;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* enqueue_hrtimer - internal function to (re)start a timer
|
|
|
|
*
|
|
|
|
* The timer is inserted in expiry order. Insertion into the
|
|
|
|
* red black tree is O(log(n)). Must hold the base lock.
|
|
|
|
*/
|
2007-02-16 10:27:50 +01:00
|
|
|
static void enqueue_hrtimer(struct hrtimer *timer,
|
|
|
|
struct hrtimer_clock_base *base)
|
2006-01-10 05:52:32 +01:00
|
|
|
{
|
|
|
|
struct rb_node **link = &base->active.rb_node;
|
|
|
|
struct rb_node *parent = NULL;
|
|
|
|
struct hrtimer *entry;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Find the right place in the rbtree:
|
|
|
|
*/
|
|
|
|
while (*link) {
|
|
|
|
parent = *link;
|
|
|
|
entry = rb_entry(parent, struct hrtimer, node);
|
|
|
|
/*
|
|
|
|
* We dont care about collisions. Nodes with
|
|
|
|
* the same expiry time stay together.
|
|
|
|
*/
|
|
|
|
if (timer->expires.tv64 < entry->expires.tv64)
|
|
|
|
link = &(*link)->rb_left;
|
2006-01-12 11:25:54 +01:00
|
|
|
else
|
2006-01-10 05:52:32 +01:00
|
|
|
link = &(*link)->rb_right;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2006-01-12 11:25:54 +01:00
|
|
|
* Insert the timer to the rbtree and check whether it
|
|
|
|
* replaces the first pending timer
|
2006-01-10 05:52:32 +01:00
|
|
|
*/
|
|
|
|
rb_link_node(&timer->node, parent, link);
|
|
|
|
rb_insert_color(&timer->node, &base->active);
|
2007-02-16 10:27:51 +01:00
|
|
|
/*
|
|
|
|
* HRTIMER_STATE_ENQUEUED is or'ed to the current state to preserve the
|
|
|
|
* state of a possibly running callback.
|
|
|
|
*/
|
|
|
|
timer->state |= HRTIMER_STATE_ENQUEUED;
|
2006-01-10 05:52:32 +01:00
|
|
|
|
2006-01-12 11:25:54 +01:00
|
|
|
if (!base->first || timer->expires.tv64 <
|
|
|
|
rb_entry(base->first, struct hrtimer, node)->expires.tv64)
|
|
|
|
base->first = &timer->node;
|
|
|
|
}
|
2006-01-10 05:52:32 +01:00
|
|
|
|
|
|
|
/*
|
|
|
|
* __remove_hrtimer - internal function to remove a timer
|
|
|
|
*
|
|
|
|
* Caller must hold the base lock.
|
|
|
|
*/
|
2007-02-16 10:27:50 +01:00
|
|
|
static void __remove_hrtimer(struct hrtimer *timer,
|
2007-02-16 10:27:51 +01:00
|
|
|
struct hrtimer_clock_base *base,
|
|
|
|
unsigned long newstate)
|
2006-01-10 05:52:32 +01:00
|
|
|
{
|
|
|
|
/*
|
2006-01-12 11:25:54 +01:00
|
|
|
* Remove the timer from the rbtree and replace the
|
|
|
|
* first entry pointer if necessary.
|
2006-01-10 05:52:32 +01:00
|
|
|
*/
|
2006-01-12 11:25:54 +01:00
|
|
|
if (base->first == &timer->node)
|
|
|
|
base->first = rb_next(&timer->node);
|
2006-01-10 05:52:32 +01:00
|
|
|
rb_erase(&timer->node, &base->active);
|
2007-02-16 10:27:51 +01:00
|
|
|
timer->state = newstate;
|
2006-01-10 05:52:32 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* remove hrtimer, called with base lock held
|
|
|
|
*/
|
|
|
|
static inline int
|
2007-02-16 10:27:50 +01:00
|
|
|
remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base)
|
2006-01-10 05:52:32 +01:00
|
|
|
{
|
2007-02-16 10:27:51 +01:00
|
|
|
if (hrtimer_is_queued(timer)) {
|
|
|
|
__remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE);
|
2006-01-10 05:52:32 +01:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* hrtimer_start - (re)start an relative timer on the current CPU
|
|
|
|
* @timer: the timer to be added
|
|
|
|
* @tim: expiry time
|
|
|
|
* @mode: expiry mode: absolute (HRTIMER_ABS) or relative (HRTIMER_REL)
|
|
|
|
*
|
|
|
|
* Returns:
|
|
|
|
* 0 on success
|
|
|
|
* 1 when the timer was active
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
|
|
|
|
{
|
2007-02-16 10:27:50 +01:00
|
|
|
struct hrtimer_clock_base *base, *new_base;
|
2006-01-10 05:52:32 +01:00
|
|
|
unsigned long flags;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
base = lock_hrtimer_base(timer, &flags);
|
|
|
|
|
|
|
|
/* Remove an active timer from the queue: */
|
|
|
|
ret = remove_hrtimer(timer, base);
|
|
|
|
|
|
|
|
/* Switch the timer base, if necessary: */
|
|
|
|
new_base = switch_hrtimer_base(timer, base);
|
|
|
|
|
2007-02-16 10:27:49 +01:00
|
|
|
if (mode == HRTIMER_MODE_REL) {
|
2006-01-10 05:52:32 +01:00
|
|
|
tim = ktime_add(tim, new_base->get_time());
|
2006-02-14 22:53:15 +01:00
|
|
|
/*
|
|
|
|
* CONFIG_TIME_LOW_RES is a temporary way for architectures
|
|
|
|
* to signal that they simply return xtime in
|
|
|
|
* do_gettimeoffset(). In this case we want to round up by
|
|
|
|
* resolution when starting a relative timer, to avoid short
|
|
|
|
* timeouts. This will go away with the GTOD framework.
|
|
|
|
*/
|
|
|
|
#ifdef CONFIG_TIME_LOW_RES
|
|
|
|
tim = ktime_add(tim, base->resolution);
|
|
|
|
#endif
|
|
|
|
}
|
2006-01-10 05:52:32 +01:00
|
|
|
timer->expires = tim;
|
|
|
|
|
|
|
|
enqueue_hrtimer(timer, new_base);
|
|
|
|
|
|
|
|
unlock_hrtimer_base(timer, &flags);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
2006-05-31 06:26:09 +02:00
|
|
|
EXPORT_SYMBOL_GPL(hrtimer_start);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
|
|
|
/**
|
|
|
|
* hrtimer_try_to_cancel - try to deactivate a timer
|
|
|
|
* @timer: hrtimer to stop
|
|
|
|
*
|
|
|
|
* Returns:
|
|
|
|
* 0 when the timer was not active
|
|
|
|
* 1 when the timer was active
|
|
|
|
* -1 when the timer is currently excuting the callback function and
|
2006-06-25 14:49:15 +02:00
|
|
|
* cannot be stopped
|
2006-01-10 05:52:32 +01:00
|
|
|
*/
|
|
|
|
int hrtimer_try_to_cancel(struct hrtimer *timer)
|
|
|
|
{
|
2007-02-16 10:27:50 +01:00
|
|
|
struct hrtimer_clock_base *base;
|
2006-01-10 05:52:32 +01:00
|
|
|
unsigned long flags;
|
|
|
|
int ret = -1;
|
|
|
|
|
|
|
|
base = lock_hrtimer_base(timer, &flags);
|
|
|
|
|
2007-02-16 10:27:51 +01:00
|
|
|
if (!hrtimer_callback_running(timer))
|
2006-01-10 05:52:32 +01:00
|
|
|
ret = remove_hrtimer(timer, base);
|
|
|
|
|
|
|
|
unlock_hrtimer_base(timer, &flags);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
}
|
2006-05-31 06:26:09 +02:00
|
|
|
EXPORT_SYMBOL_GPL(hrtimer_try_to_cancel);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
|
|
|
/**
|
|
|
|
* hrtimer_cancel - cancel a timer and wait for the handler to finish.
|
|
|
|
* @timer: the timer to be cancelled
|
|
|
|
*
|
|
|
|
* Returns:
|
|
|
|
* 0 when the timer was not active
|
|
|
|
* 1 when the timer was active
|
|
|
|
*/
|
|
|
|
int hrtimer_cancel(struct hrtimer *timer)
|
|
|
|
{
|
|
|
|
for (;;) {
|
|
|
|
int ret = hrtimer_try_to_cancel(timer);
|
|
|
|
|
|
|
|
if (ret >= 0)
|
|
|
|
return ret;
|
2006-04-11 07:54:13 +02:00
|
|
|
cpu_relax();
|
2006-01-10 05:52:32 +01:00
|
|
|
}
|
|
|
|
}
|
2006-05-31 06:26:09 +02:00
|
|
|
EXPORT_SYMBOL_GPL(hrtimer_cancel);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
|
|
|
/**
|
|
|
|
* hrtimer_get_remaining - get remaining time for the timer
|
|
|
|
* @timer: the timer to read
|
|
|
|
*/
|
|
|
|
ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
|
|
|
|
{
|
2007-02-16 10:27:50 +01:00
|
|
|
struct hrtimer_clock_base *base;
|
2006-01-10 05:52:32 +01:00
|
|
|
unsigned long flags;
|
|
|
|
ktime_t rem;
|
|
|
|
|
|
|
|
base = lock_hrtimer_base(timer, &flags);
|
2007-02-16 10:27:50 +01:00
|
|
|
rem = ktime_sub(timer->expires, base->get_time());
|
2006-01-10 05:52:32 +01:00
|
|
|
unlock_hrtimer_base(timer, &flags);
|
|
|
|
|
|
|
|
return rem;
|
|
|
|
}
|
2006-05-31 06:26:09 +02:00
|
|
|
EXPORT_SYMBOL_GPL(hrtimer_get_remaining);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
2007-02-16 10:27:47 +01:00
|
|
|
#if defined(CONFIG_NO_IDLE_HZ) || defined(CONFIG_NO_HZ)
|
2006-03-07 00:42:45 +01:00
|
|
|
/**
|
|
|
|
* hrtimer_get_next_event - get the time until next expiry event
|
|
|
|
*
|
|
|
|
* Returns the delta to the next expiry event or KTIME_MAX if no timer
|
|
|
|
* is pending.
|
|
|
|
*/
|
|
|
|
ktime_t hrtimer_get_next_event(void)
|
|
|
|
{
|
2007-02-16 10:27:50 +01:00
|
|
|
struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
|
|
|
|
struct hrtimer_clock_base *base = cpu_base->clock_base;
|
2006-03-07 00:42:45 +01:00
|
|
|
ktime_t delta, mindelta = { .tv64 = KTIME_MAX };
|
|
|
|
unsigned long flags;
|
|
|
|
int i;
|
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
spin_lock_irqsave(&cpu_base->lock, flags);
|
|
|
|
|
|
|
|
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) {
|
2006-03-07 00:42:45 +01:00
|
|
|
struct hrtimer *timer;
|
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
if (!base->first)
|
2006-03-07 00:42:45 +01:00
|
|
|
continue;
|
2007-02-16 10:27:50 +01:00
|
|
|
|
2006-03-07 00:42:45 +01:00
|
|
|
timer = rb_entry(base->first, struct hrtimer, node);
|
|
|
|
delta.tv64 = timer->expires.tv64;
|
|
|
|
delta = ktime_sub(delta, base->get_time());
|
|
|
|
if (delta.tv64 < mindelta.tv64)
|
|
|
|
mindelta.tv64 = delta.tv64;
|
|
|
|
}
|
2007-02-16 10:27:50 +01:00
|
|
|
|
|
|
|
spin_unlock_irqrestore(&cpu_base->lock, flags);
|
|
|
|
|
2006-03-07 00:42:45 +01:00
|
|
|
if (mindelta.tv64 < 0)
|
|
|
|
mindelta.tv64 = 0;
|
|
|
|
return mindelta;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2006-01-10 05:52:32 +01:00
|
|
|
/**
|
2006-02-01 12:05:11 +01:00
|
|
|
* hrtimer_init - initialize a timer to the given clock
|
|
|
|
* @timer: the timer to be initialized
|
2006-01-10 05:52:32 +01:00
|
|
|
* @clock_id: the clock to be used
|
2006-02-01 12:05:11 +01:00
|
|
|
* @mode: timer mode abs/rel
|
2006-01-10 05:52:32 +01:00
|
|
|
*/
|
2006-02-01 12:05:11 +01:00
|
|
|
void hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
|
|
|
|
enum hrtimer_mode mode)
|
2006-01-10 05:52:32 +01:00
|
|
|
{
|
2007-02-16 10:27:50 +01:00
|
|
|
struct hrtimer_cpu_base *cpu_base;
|
2006-01-10 05:52:32 +01:00
|
|
|
|
2006-02-01 12:05:11 +01:00
|
|
|
memset(timer, 0, sizeof(struct hrtimer));
|
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
cpu_base = &__raw_get_cpu_var(hrtimer_bases);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
2007-02-16 10:27:49 +01:00
|
|
|
if (clock_id == CLOCK_REALTIME && mode != HRTIMER_MODE_ABS)
|
2006-02-01 12:05:11 +01:00
|
|
|
clock_id = CLOCK_MONOTONIC;
|
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
timer->base = &cpu_base->clock_base[clock_id];
|
2006-01-10 05:52:32 +01:00
|
|
|
}
|
2006-05-31 06:26:09 +02:00
|
|
|
EXPORT_SYMBOL_GPL(hrtimer_init);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
|
|
|
/**
|
|
|
|
* hrtimer_get_res - get the timer resolution for a clock
|
|
|
|
* @which_clock: which clock to query
|
|
|
|
* @tp: pointer to timespec variable to store the resolution
|
|
|
|
*
|
2007-02-10 10:45:59 +01:00
|
|
|
* Store the resolution of the clock selected by @which_clock in the
|
|
|
|
* variable pointed to by @tp.
|
2006-01-10 05:52:32 +01:00
|
|
|
*/
|
|
|
|
int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp)
|
|
|
|
{
|
2007-02-16 10:27:50 +01:00
|
|
|
struct hrtimer_cpu_base *cpu_base;
|
2006-01-10 05:52:32 +01:00
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
cpu_base = &__raw_get_cpu_var(hrtimer_bases);
|
|
|
|
*tp = ktime_to_timespec(cpu_base->clock_base[which_clock].resolution);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2006-05-31 06:26:09 +02:00
|
|
|
EXPORT_SYMBOL_GPL(hrtimer_get_res);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Expire the per base hrtimer-queue:
|
|
|
|
*/
|
2007-02-16 10:27:50 +01:00
|
|
|
static inline void run_hrtimer_queue(struct hrtimer_cpu_base *cpu_base,
|
|
|
|
int index)
|
2006-01-10 05:52:32 +01:00
|
|
|
{
|
2006-01-12 11:25:54 +01:00
|
|
|
struct rb_node *node;
|
2007-02-16 10:27:50 +01:00
|
|
|
struct hrtimer_clock_base *base = &cpu_base->clock_base[index];
|
2006-01-10 05:52:32 +01:00
|
|
|
|
2006-03-31 12:31:20 +02:00
|
|
|
if (!base->first)
|
|
|
|
return;
|
|
|
|
|
2006-03-26 11:38:05 +02:00
|
|
|
if (base->get_softirq_time)
|
|
|
|
base->softirq_time = base->get_softirq_time();
|
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
spin_lock_irq(&cpu_base->lock);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
2006-01-12 11:25:54 +01:00
|
|
|
while ((node = base->first)) {
|
2006-01-10 05:52:32 +01:00
|
|
|
struct hrtimer *timer;
|
2007-02-16 10:27:49 +01:00
|
|
|
enum hrtimer_restart (*fn)(struct hrtimer *);
|
2006-01-10 05:52:32 +01:00
|
|
|
int restart;
|
|
|
|
|
2006-01-12 11:25:54 +01:00
|
|
|
timer = rb_entry(node, struct hrtimer, node);
|
2006-03-26 11:38:05 +02:00
|
|
|
if (base->softirq_time.tv64 <= timer->expires.tv64)
|
2006-01-10 05:52:32 +01:00
|
|
|
break;
|
|
|
|
|
|
|
|
fn = timer->function;
|
2007-02-16 10:27:51 +01:00
|
|
|
__remove_hrtimer(timer, base, HRTIMER_STATE_CALLBACK);
|
2007-02-16 10:27:50 +01:00
|
|
|
spin_unlock_irq(&cpu_base->lock);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
2006-03-26 11:38:12 +02:00
|
|
|
restart = fn(timer);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
spin_lock_irq(&cpu_base->lock);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
2007-02-16 10:27:51 +01:00
|
|
|
timer->state &= ~HRTIMER_STATE_CALLBACK;
|
2006-03-26 11:38:09 +02:00
|
|
|
if (restart != HRTIMER_NORESTART) {
|
|
|
|
BUG_ON(hrtimer_active(timer));
|
2006-01-10 05:52:32 +01:00
|
|
|
enqueue_hrtimer(timer, base);
|
2006-03-26 11:38:09 +02:00
|
|
|
}
|
2006-01-10 05:52:32 +01:00
|
|
|
}
|
2007-02-16 10:27:50 +01:00
|
|
|
spin_unlock_irq(&cpu_base->lock);
|
2006-01-10 05:52:32 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called from timer softirq every jiffy, expire hrtimers:
|
|
|
|
*/
|
|
|
|
void hrtimer_run_queues(void)
|
|
|
|
{
|
2007-02-16 10:27:50 +01:00
|
|
|
struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
|
2006-01-10 05:52:32 +01:00
|
|
|
int i;
|
|
|
|
|
2007-02-16 10:28:03 +01:00
|
|
|
/*
|
|
|
|
* This _is_ ugly: We have to check in the softirq context,
|
|
|
|
* whether we can switch to highres and / or nohz mode. The
|
|
|
|
* clocksource switch happens in the timer interrupt with
|
|
|
|
* xtime_lock held. Notification from there only sets the
|
|
|
|
* check bit in the tick_oneshot code, otherwise we might
|
|
|
|
* deadlock vs. xtime_lock.
|
|
|
|
*/
|
|
|
|
tick_check_oneshot_change(1);
|
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
hrtimer_get_softirq_time(cpu_base);
|
2006-03-26 11:38:05 +02:00
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++)
|
|
|
|
run_hrtimer_queue(cpu_base, i);
|
2006-01-10 05:52:32 +01:00
|
|
|
}
|
|
|
|
|
2006-01-10 05:52:35 +01:00
|
|
|
/*
|
|
|
|
* Sleep related functions:
|
|
|
|
*/
|
2007-02-16 10:27:49 +01:00
|
|
|
static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer)
|
2006-03-31 12:31:17 +02:00
|
|
|
{
|
|
|
|
struct hrtimer_sleeper *t =
|
|
|
|
container_of(timer, struct hrtimer_sleeper, timer);
|
|
|
|
struct task_struct *task = t->task;
|
|
|
|
|
|
|
|
t->task = NULL;
|
|
|
|
if (task)
|
|
|
|
wake_up_process(task);
|
|
|
|
|
|
|
|
return HRTIMER_NORESTART;
|
|
|
|
}
|
|
|
|
|
2006-07-03 09:25:41 +02:00
|
|
|
void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
|
2006-03-31 12:31:17 +02:00
|
|
|
{
|
|
|
|
sl->timer.function = hrtimer_wakeup;
|
|
|
|
sl->task = task;
|
|
|
|
}
|
|
|
|
|
2006-03-31 12:31:19 +02:00
|
|
|
static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
|
2006-03-26 11:38:08 +02:00
|
|
|
{
|
2006-03-31 12:31:19 +02:00
|
|
|
hrtimer_init_sleeper(t, current);
|
2006-01-10 05:52:35 +01:00
|
|
|
|
2006-03-26 11:38:08 +02:00
|
|
|
do {
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
hrtimer_start(&t->timer, t->timer.expires, mode);
|
|
|
|
|
|
|
|
schedule();
|
|
|
|
|
2006-03-31 12:31:19 +02:00
|
|
|
hrtimer_cancel(&t->timer);
|
2007-02-16 10:27:49 +01:00
|
|
|
mode = HRTIMER_MODE_ABS;
|
2006-03-31 12:31:19 +02:00
|
|
|
|
|
|
|
} while (t->task && !signal_pending(current));
|
2006-03-26 11:38:08 +02:00
|
|
|
|
2006-03-31 12:31:19 +02:00
|
|
|
return t->task == NULL;
|
2006-01-10 05:52:35 +01:00
|
|
|
}
|
|
|
|
|
2006-09-29 11:00:28 +02:00
|
|
|
long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
|
2006-01-10 05:52:35 +01:00
|
|
|
{
|
2006-03-31 12:31:19 +02:00
|
|
|
struct hrtimer_sleeper t;
|
2006-01-16 10:59:41 +01:00
|
|
|
struct timespec __user *rmtp;
|
|
|
|
struct timespec tu;
|
2006-03-26 11:38:08 +02:00
|
|
|
ktime_t time;
|
2006-01-10 05:52:35 +01:00
|
|
|
|
|
|
|
restart->fn = do_no_restart_syscall;
|
|
|
|
|
2007-02-16 10:27:49 +01:00
|
|
|
hrtimer_init(&t.timer, restart->arg0, HRTIMER_MODE_ABS);
|
2006-09-29 11:00:28 +02:00
|
|
|
t.timer.expires.tv64 = ((u64)restart->arg3 << 32) | (u64) restart->arg2;
|
2006-01-10 05:52:35 +01:00
|
|
|
|
2007-02-16 10:27:49 +01:00
|
|
|
if (do_nanosleep(&t, HRTIMER_MODE_ABS))
|
2006-01-10 05:52:35 +01:00
|
|
|
return 0;
|
|
|
|
|
2006-09-29 11:00:28 +02:00
|
|
|
rmtp = (struct timespec __user *) restart->arg1;
|
2006-03-26 11:38:08 +02:00
|
|
|
if (rmtp) {
|
|
|
|
time = ktime_sub(t.timer.expires, t.timer.base->get_time());
|
|
|
|
if (time.tv64 <= 0)
|
|
|
|
return 0;
|
|
|
|
tu = ktime_to_timespec(time);
|
|
|
|
if (copy_to_user(rmtp, &tu, sizeof(tu)))
|
|
|
|
return -EFAULT;
|
|
|
|
}
|
2006-01-10 05:52:35 +01:00
|
|
|
|
2006-09-29 11:00:28 +02:00
|
|
|
restart->fn = hrtimer_nanosleep_restart;
|
2006-01-10 05:52:35 +01:00
|
|
|
|
|
|
|
/* The other values in restart are already filled in */
|
|
|
|
return -ERESTART_RESTARTBLOCK;
|
|
|
|
}
|
|
|
|
|
|
|
|
long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
|
|
|
|
const enum hrtimer_mode mode, const clockid_t clockid)
|
|
|
|
{
|
|
|
|
struct restart_block *restart;
|
2006-03-31 12:31:19 +02:00
|
|
|
struct hrtimer_sleeper t;
|
2006-01-10 05:52:35 +01:00
|
|
|
struct timespec tu;
|
|
|
|
ktime_t rem;
|
|
|
|
|
2006-03-26 11:38:08 +02:00
|
|
|
hrtimer_init(&t.timer, clockid, mode);
|
|
|
|
t.timer.expires = timespec_to_ktime(*rqtp);
|
|
|
|
if (do_nanosleep(&t, mode))
|
2006-01-10 05:52:35 +01:00
|
|
|
return 0;
|
|
|
|
|
2006-02-01 12:05:11 +01:00
|
|
|
/* Absolute timers do not update the rmtp value and restart: */
|
2007-02-16 10:27:49 +01:00
|
|
|
if (mode == HRTIMER_MODE_ABS)
|
2006-01-10 05:52:35 +01:00
|
|
|
return -ERESTARTNOHAND;
|
|
|
|
|
2006-03-26 11:38:08 +02:00
|
|
|
if (rmtp) {
|
|
|
|
rem = ktime_sub(t.timer.expires, t.timer.base->get_time());
|
|
|
|
if (rem.tv64 <= 0)
|
|
|
|
return 0;
|
|
|
|
tu = ktime_to_timespec(rem);
|
|
|
|
if (copy_to_user(rmtp, &tu, sizeof(tu)))
|
|
|
|
return -EFAULT;
|
|
|
|
}
|
2006-01-10 05:52:35 +01:00
|
|
|
|
|
|
|
restart = ¤t_thread_info()->restart_block;
|
2006-09-29 11:00:28 +02:00
|
|
|
restart->fn = hrtimer_nanosleep_restart;
|
|
|
|
restart->arg0 = (unsigned long) t.timer.base->index;
|
|
|
|
restart->arg1 = (unsigned long) rmtp;
|
|
|
|
restart->arg2 = t.timer.expires.tv64 & 0xFFFFFFFF;
|
|
|
|
restart->arg3 = t.timer.expires.tv64 >> 32;
|
2006-01-10 05:52:35 +01:00
|
|
|
|
|
|
|
return -ERESTART_RESTARTBLOCK;
|
|
|
|
}
|
|
|
|
|
2006-01-10 05:52:36 +01:00
|
|
|
asmlinkage long
|
|
|
|
sys_nanosleep(struct timespec __user *rqtp, struct timespec __user *rmtp)
|
|
|
|
{
|
|
|
|
struct timespec tu;
|
|
|
|
|
|
|
|
if (copy_from_user(&tu, rqtp, sizeof(tu)))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
if (!timespec_valid(&tu))
|
|
|
|
return -EINVAL;
|
|
|
|
|
2007-02-16 10:27:49 +01:00
|
|
|
return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
|
2006-01-10 05:52:36 +01:00
|
|
|
}
|
|
|
|
|
2006-01-10 05:52:32 +01:00
|
|
|
/*
|
|
|
|
* Functions related to boot-time initialization:
|
|
|
|
*/
|
|
|
|
static void __devinit init_hrtimers_cpu(int cpu)
|
|
|
|
{
|
2007-02-16 10:27:50 +01:00
|
|
|
struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
|
2006-01-10 05:52:32 +01:00
|
|
|
int i;
|
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
spin_lock_init(&cpu_base->lock);
|
|
|
|
lockdep_set_class(&cpu_base->lock, &cpu_base->lock_key);
|
|
|
|
|
|
|
|
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++)
|
|
|
|
cpu_base->clock_base[i].cpu_base = cpu_base;
|
|
|
|
|
2006-01-10 05:52:32 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
|
|
|
|
struct hrtimer_clock_base *new_base)
|
2006-01-10 05:52:32 +01:00
|
|
|
{
|
|
|
|
struct hrtimer *timer;
|
|
|
|
struct rb_node *node;
|
|
|
|
|
|
|
|
while ((node = rb_first(&old_base->active))) {
|
|
|
|
timer = rb_entry(node, struct hrtimer, node);
|
2007-02-16 10:27:51 +01:00
|
|
|
BUG_ON(timer->state & HRTIMER_STATE_CALLBACK);
|
|
|
|
__remove_hrtimer(timer, old_base, HRTIMER_STATE_INACTIVE);
|
2006-01-10 05:52:32 +01:00
|
|
|
timer->base = new_base;
|
|
|
|
enqueue_hrtimer(timer, new_base);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void migrate_hrtimers(int cpu)
|
|
|
|
{
|
2007-02-16 10:27:50 +01:00
|
|
|
struct hrtimer_cpu_base *old_base, *new_base;
|
2006-01-10 05:52:32 +01:00
|
|
|
int i;
|
|
|
|
|
|
|
|
BUG_ON(cpu_online(cpu));
|
2007-02-16 10:27:50 +01:00
|
|
|
old_base = &per_cpu(hrtimer_bases, cpu);
|
|
|
|
new_base = &get_cpu_var(hrtimer_bases);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
|
|
|
local_irq_disable();
|
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
spin_lock(&new_base->lock);
|
|
|
|
spin_lock(&old_base->lock);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
2007-02-16 10:27:50 +01:00
|
|
|
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
|
|
|
|
migrate_hrtimer_list(&old_base->clock_base[i],
|
|
|
|
&new_base->clock_base[i]);
|
2006-01-10 05:52:32 +01:00
|
|
|
}
|
2007-02-16 10:27:50 +01:00
|
|
|
spin_unlock(&old_base->lock);
|
|
|
|
spin_unlock(&new_base->lock);
|
2006-01-10 05:52:32 +01:00
|
|
|
|
|
|
|
local_irq_enable();
|
|
|
|
put_cpu_var(hrtimer_bases);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
|
2006-07-30 12:03:35 +02:00
|
|
|
static int __cpuinit hrtimer_cpu_notify(struct notifier_block *self,
|
2006-01-10 05:52:32 +01:00
|
|
|
unsigned long action, void *hcpu)
|
|
|
|
{
|
|
|
|
long cpu = (long)hcpu;
|
|
|
|
|
|
|
|
switch (action) {
|
|
|
|
|
|
|
|
case CPU_UP_PREPARE:
|
|
|
|
init_hrtimers_cpu(cpu);
|
|
|
|
break;
|
|
|
|
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
case CPU_DEAD:
|
2007-02-16 10:28:00 +01:00
|
|
|
clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DEAD, &cpu);
|
2006-01-10 05:52:32 +01:00
|
|
|
migrate_hrtimers(cpu);
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return NOTIFY_OK;
|
|
|
|
}
|
|
|
|
|
2006-07-30 12:03:35 +02:00
|
|
|
static struct notifier_block __cpuinitdata hrtimers_nb = {
|
2006-01-10 05:52:32 +01:00
|
|
|
.notifier_call = hrtimer_cpu_notify,
|
|
|
|
};
|
|
|
|
|
|
|
|
void __init hrtimers_init(void)
|
|
|
|
{
|
|
|
|
hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE,
|
|
|
|
(void *)(long)smp_processor_id());
|
|
|
|
register_cpu_notifier(&hrtimers_nb);
|
|
|
|
}
|
|
|
|
|