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-rw-r--r--kernel/Makefile25
-rw-r--r--kernel/acct.c10
-rw-r--r--kernel/debug/kdb/kdb_main.c2
-rw-r--r--kernel/delayacct.c62
-rw-r--r--kernel/fork.c5
-rw-r--r--kernel/time/Kconfig9
-rw-r--r--kernel/time/Makefile19
-rw-r--r--kernel/time/clocksource.c12
-rw-r--r--kernel/time/hrtimer.c (renamed from kernel/hrtimer.c)125
-rw-r--r--kernel/time/itimer.c (renamed from kernel/itimer.c)0
-rw-r--r--kernel/time/ntp.c15
-rw-r--r--kernel/time/ntp_internal.h2
-rw-r--r--kernel/time/posix-cpu-timers.c (renamed from kernel/posix-cpu-timers.c)0
-rw-r--r--kernel/time/posix-timers.c (renamed from kernel/posix-timers.c)2
-rw-r--r--kernel/time/tick-internal.h2
-rw-r--r--kernel/time/time.c (renamed from kernel/time.c)64
-rw-r--r--kernel/time/timeconst.bc (renamed from kernel/timeconst.bc)0
-rw-r--r--kernel/time/timekeeping.c1147
-rw-r--r--kernel/time/timekeeping.h20
-rw-r--r--kernel/time/timekeeping_debug.c2
-rw-r--r--kernel/time/timekeeping_internal.h17
-rw-r--r--kernel/time/timer.c (renamed from kernel/timer.c)34
-rw-r--r--kernel/time/udelay_test.c168
-rw-r--r--kernel/trace/trace.c11
-rw-r--r--kernel/tsacct.c19
25 files changed, 1024 insertions, 748 deletions
diff --git a/kernel/Makefile b/kernel/Makefile
index f2a8b6246ce9..973a40cf8068 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -3,12 +3,11 @@
#
obj-y = fork.o exec_domain.o panic.o \
- cpu.o exit.o itimer.o time.o softirq.o resource.o \
- sysctl.o sysctl_binary.o capability.o ptrace.o timer.o user.o \
+ cpu.o exit.o softirq.o resource.o \
+ sysctl.o sysctl_binary.o capability.o ptrace.o user.o \
signal.o sys.o kmod.o workqueue.o pid.o task_work.o \
- extable.o params.o posix-timers.o \
- kthread.o sys_ni.o posix-cpu-timers.o \
- hrtimer.o nsproxy.o \
+ extable.o params.o \
+ kthread.o sys_ni.o nsproxy.o \
notifier.o ksysfs.o cred.o reboot.o \
async.o range.o groups.o smpboot.o
@@ -110,22 +109,6 @@ targets += config_data.h
$(obj)/config_data.h: $(obj)/config_data.gz FORCE
$(call filechk,ikconfiggz)
-$(obj)/time.o: $(obj)/timeconst.h
-
-quiet_cmd_hzfile = HZFILE $@
- cmd_hzfile = echo "hz=$(CONFIG_HZ)" > $@
-
-targets += hz.bc
-$(obj)/hz.bc: $(objtree)/include/config/hz.h FORCE
- $(call if_changed,hzfile)
-
-quiet_cmd_bc = BC $@
- cmd_bc = bc -q $(filter-out FORCE,$^) > $@
-
-targets += timeconst.h
-$(obj)/timeconst.h: $(obj)/hz.bc $(src)/timeconst.bc FORCE
- $(call if_changed,bc)
-
###############################################################################
#
# Roll all the X.509 certificates that we can find together and pull them into
diff --git a/kernel/acct.c b/kernel/acct.c
index 808a86ff229d..a1844f14c6d6 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -458,9 +458,7 @@ static void do_acct_process(struct bsd_acct_struct *acct,
acct_t ac;
mm_segment_t fs;
unsigned long flim;
- u64 elapsed;
- u64 run_time;
- struct timespec uptime;
+ u64 elapsed, run_time;
struct tty_struct *tty;
const struct cred *orig_cred;
@@ -484,10 +482,8 @@ static void do_acct_process(struct bsd_acct_struct *acct,
strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm));
/* calculate run_time in nsec*/
- do_posix_clock_monotonic_gettime(&uptime);
- run_time = (u64)uptime.tv_sec*NSEC_PER_SEC + uptime.tv_nsec;
- run_time -= (u64)current->group_leader->start_time.tv_sec * NSEC_PER_SEC
- + current->group_leader->start_time.tv_nsec;
+ run_time = ktime_get_ns();
+ run_time -= current->group_leader->start_time;
/* convert nsec -> AHZ */
elapsed = nsec_to_AHZ(run_time);
#if ACCT_VERSION==3
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 2f7c760305ca..379650b984f8 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -2472,7 +2472,7 @@ static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm)
static void kdb_sysinfo(struct sysinfo *val)
{
struct timespec uptime;
- do_posix_clock_monotonic_gettime(&uptime);
+ ktime_get_ts(&uptime);
memset(val, 0, sizeof(*val));
val->uptime = uptime.tv_sec;
val->loads[0] = avenrun[0];
diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index 54996b71e66d..ef90b04d783f 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -46,42 +46,25 @@ void __delayacct_tsk_init(struct task_struct *tsk)
}
/*
- * Start accounting for a delay statistic using
- * its starting timestamp (@start)
+ * Finish delay accounting for a statistic using its timestamps (@start),
+ * accumalator (@total) and @count
*/
-
-static inline void delayacct_start(struct timespec *start)
+static void delayacct_end(u64 *start, u64 *total, u32 *count)
{
- do_posix_clock_monotonic_gettime(start);
-}
-
-/*
- * Finish delay accounting for a statistic using
- * its timestamps (@start, @end), accumalator (@total) and @count
- */
-
-static void delayacct_end(struct timespec *start, struct timespec *end,
- u64 *total, u32 *count)
-{
- struct timespec ts;
- s64 ns;
+ s64 ns = ktime_get_ns() - *start;
unsigned long flags;
- do_posix_clock_monotonic_gettime(end);
- ts = timespec_sub(*end, *start);
- ns = timespec_to_ns(&ts);
- if (ns < 0)
- return;
-
- spin_lock_irqsave(&current->delays->lock, flags);
- *total += ns;
- (*count)++;
- spin_unlock_irqrestore(&current->delays->lock, flags);
+ if (ns > 0) {
+ spin_lock_irqsave(&current->delays->lock, flags);
+ *total += ns;
+ (*count)++;
+ spin_unlock_irqrestore(&current->delays->lock, flags);
+ }
}
void __delayacct_blkio_start(void)
{
- delayacct_start(&current->delays->blkio_start);
+ current->delays->blkio_start = ktime_get_ns();
}
void __delayacct_blkio_end(void)
@@ -89,35 +72,29 @@ void __delayacct_blkio_end(void)
if (current->delays->flags & DELAYACCT_PF_SWAPIN)
/* Swapin block I/O */
delayacct_end(&current->delays->blkio_start,
- &current->delays->blkio_end,
&current->delays->swapin_delay,
&current->delays->swapin_count);
else /* Other block I/O */
delayacct_end(&current->delays->blkio_start,
- &current->delays->blkio_end,
&current->delays->blkio_delay,
&current->delays->blkio_count);
}
int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
{
- s64 tmp;
- unsigned long t1;
- unsigned long long t2, t3;
- unsigned long flags;
- struct timespec ts;
cputime_t utime, stime, stimescaled, utimescaled;
+ unsigned long long t2, t3;
+ unsigned long flags, t1;
+ s64 tmp;
- tmp = (s64)d->cpu_run_real_total;
task_cputime(tsk, &utime, &stime);
- cputime_to_timespec(utime + stime, &ts);
- tmp += timespec_to_ns(&ts);
+ tmp = (s64)d->cpu_run_real_total;
+ tmp += cputime_to_nsecs(utime + stime);
d->cpu_run_real_total = (tmp < (s64)d->cpu_run_real_total) ? 0 : tmp;
- tmp = (s64)d->cpu_scaled_run_real_total;
task_cputime_scaled(tsk, &utimescaled, &stimescaled);
- cputime_to_timespec(utimescaled + stimescaled, &ts);
- tmp += timespec_to_ns(&ts);
+ tmp = (s64)d->cpu_scaled_run_real_total;
+ tmp += cputime_to_nsecs(utimescaled + stimescaled);
d->cpu_scaled_run_real_total =
(tmp < (s64)d->cpu_scaled_run_real_total) ? 0 : tmp;
@@ -169,13 +146,12 @@ __u64 __delayacct_blkio_ticks(struct task_struct *tsk)
void __delayacct_freepages_start(void)
{
- delayacct_start(&current->delays->freepages_start);
+ current->delays->freepages_start = ktime_get_ns();
}
void __delayacct_freepages_end(void)
{
delayacct_end(&current->delays->freepages_start,
- &current->delays->freepages_end,
&current->delays->freepages_delay,
&current->delays->freepages_count);
}
diff --git a/kernel/fork.c b/kernel/fork.c
index 962885edbe53..5f1bf3bebb4f 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1261,9 +1261,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
posix_cpu_timers_init(p);
- do_posix_clock_monotonic_gettime(&p->start_time);
- p->real_start_time = p->start_time;
- monotonic_to_bootbased(&p->real_start_time);
+ p->start_time = ktime_get_ns();
+ p->real_start_time = ktime_get_boot_ns();
p->io_context = NULL;
p->audit_context = NULL;
if (clone_flags & CLONE_THREAD)
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index f448513a45ed..d626dc98e8df 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -12,6 +12,11 @@ config CLOCKSOURCE_WATCHDOG
config ARCH_CLOCKSOURCE_DATA
bool
+# Clocksources require validation of the clocksource against the last
+# cycle update - x86/TSC misfeature
+config CLOCKSOURCE_VALIDATE_LAST_CYCLE
+ bool
+
# Timekeeping vsyscall support
config GENERIC_TIME_VSYSCALL
bool
@@ -20,10 +25,6 @@ config GENERIC_TIME_VSYSCALL
config GENERIC_TIME_VSYSCALL_OLD
bool
-# ktime_t scalar 64bit nsec representation
-config KTIME_SCALAR
- bool
-
# Old style timekeeping
config ARCH_USES_GETTIMEOFFSET
bool
diff --git a/kernel/time/Makefile b/kernel/time/Makefile
index 57a413fd0ebf..7347426fa68d 100644
--- a/kernel/time/Makefile
+++ b/kernel/time/Makefile
@@ -1,3 +1,4 @@
+obj-y += time.o timer.o hrtimer.o itimer.o posix-timers.o posix-cpu-timers.o
obj-y += timekeeping.o ntp.o clocksource.o jiffies.o timer_list.o
obj-y += timeconv.o posix-clock.o alarmtimer.o
@@ -12,3 +13,21 @@ obj-$(CONFIG_TICK_ONESHOT) += tick-oneshot.o
obj-$(CONFIG_TICK_ONESHOT) += tick-sched.o
obj-$(CONFIG_TIMER_STATS) += timer_stats.o
obj-$(CONFIG_DEBUG_FS) += timekeeping_debug.o
+obj-$(CONFIG_TEST_UDELAY) += udelay_test.o
+
+$(obj)/time.o: $(obj)/timeconst.h
+
+quiet_cmd_hzfile = HZFILE $@
+ cmd_hzfile = echo "hz=$(CONFIG_HZ)" > $@
+
+targets += hz.bc
+$(obj)/hz.bc: $(objtree)/include/config/hz.h FORCE
+ $(call if_changed,hzfile)
+
+quiet_cmd_bc = BC $@
+ cmd_bc = bc -q $(filter-out FORCE,$^) > $@
+
+targets += timeconst.h
+$(obj)/timeconst.h: $(obj)/hz.bc $(src)/timeconst.bc FORCE
+ $(call if_changed,bc)
+
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index ba3e502c955a..2e949cc9c9f1 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -32,6 +32,7 @@
#include <linux/kthread.h>
#include "tick-internal.h"
+#include "timekeeping_internal.h"
void timecounter_init(struct timecounter *tc,
const struct cyclecounter *cc,
@@ -249,7 +250,7 @@ void clocksource_mark_unstable(struct clocksource *cs)
static void clocksource_watchdog(unsigned long data)
{
struct clocksource *cs;
- cycle_t csnow, wdnow;
+ cycle_t csnow, wdnow, delta;
int64_t wd_nsec, cs_nsec;
int next_cpu, reset_pending;
@@ -282,11 +283,12 @@ static void clocksource_watchdog(unsigned long data)
continue;
}
- wd_nsec = clocksource_cyc2ns((wdnow - cs->wd_last) & watchdog->mask,
- watchdog->mult, watchdog->shift);
+ delta = clocksource_delta(wdnow, cs->wd_last, watchdog->mask);
+ wd_nsec = clocksource_cyc2ns(delta, watchdog->mult,
+ watchdog->shift);
- cs_nsec = clocksource_cyc2ns((csnow - cs->cs_last) &
- cs->mask, cs->mult, cs->shift);
+ delta = clocksource_delta(csnow, cs->cs_last, cs->mask);
+ cs_nsec = clocksource_cyc2ns(delta, cs->mult, cs->shift);
cs->cs_last = csnow;
cs->wd_last = wdnow;
diff --git a/kernel/hrtimer.c b/kernel/time/hrtimer.c
index 3ab28993f6e0..1c2fe7de2842 100644
--- a/kernel/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -54,6 +54,8 @@
#include <trace/events/timer.h>
+#include "timekeeping.h"
+
/*
* The timer bases:
*
@@ -114,21 +116,18 @@ static inline int hrtimer_clockid_to_base(clockid_t clock_id)
*/
static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
{
- ktime_t xtim, mono, boot;
- struct timespec xts, tom, slp;
- s32 tai_offset;
+ ktime_t xtim, mono, boot, tai;
+ ktime_t off_real, off_boot, off_tai;
- get_xtime_and_monotonic_and_sleep_offset(&xts, &tom, &slp);
- tai_offset = timekeeping_get_tai_offset();
+ mono = ktime_get_update_offsets_tick(&off_real, &off_boot, &off_tai);
+ boot = ktime_add(mono, off_boot);
+ xtim = ktime_add(mono, off_real);
+ tai = ktime_add(xtim, off_tai);
- xtim = timespec_to_ktime(xts);
- mono = ktime_add(xtim, timespec_to_ktime(tom));
- boot = ktime_add(mono, timespec_to_ktime(slp));
base->clock_base[HRTIMER_BASE_REALTIME].softirq_time = xtim;
base->clock_base[HRTIMER_BASE_MONOTONIC].softirq_time = mono;
base->clock_base[HRTIMER_BASE_BOOTTIME].softirq_time = boot;
- base->clock_base[HRTIMER_BASE_TAI].softirq_time =
- ktime_add(xtim, ktime_set(tai_offset, 0));
+ base->clock_base[HRTIMER_BASE_TAI].softirq_time = tai;
}
/*
@@ -264,60 +263,6 @@ lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
* too large for inlining:
*/
#if BITS_PER_LONG < 64
-# ifndef CONFIG_KTIME_SCALAR
-/**
- * ktime_add_ns - Add a scalar nanoseconds value to a ktime_t variable
- * @kt: addend
- * @nsec: the scalar nsec value to add
- *
- * Returns the sum of kt and nsec in ktime_t format
- */
-ktime_t ktime_add_ns(const ktime_t kt, u64 nsec)
-{
- ktime_t tmp;
-
- if (likely(nsec < NSEC_PER_SEC)) {
- tmp.tv64 = nsec;
- } else {
- unsigned long rem = do_div(nsec, NSEC_PER_SEC);
-
- /* Make sure nsec fits into long */
- if (unlikely(nsec > KTIME_SEC_MAX))
- return (ktime_t){ .tv64 = KTIME_MAX };
-
- tmp = ktime_set((long)nsec, rem);
- }
-
- return ktime_add(kt, tmp);
-}
-
-EXPORT_SYMBOL_GPL(ktime_add_ns);
-
-/**
- * ktime_sub_ns - Subtract a scalar nanoseconds value from a ktime_t variable
- * @kt: minuend
- * @nsec: the scalar nsec value to subtract
- *
- * Returns the subtraction of @nsec from @kt in ktime_t format
- */
-ktime_t ktime_sub_ns(const ktime_t kt, u64 nsec)
-{
- ktime_t tmp;
-
- if (likely(nsec < NSEC_PER_SEC)) {
- tmp.tv64 = nsec;
- } else {
- unsigned long rem = do_div(nsec, NSEC_PER_SEC);
-
- tmp = ktime_set((long)nsec, rem);
- }
-
- return ktime_sub(kt, tmp);
-}
-
-EXPORT_SYMBOL_GPL(ktime_sub_ns);
-# endif /* !CONFIG_KTIME_SCALAR */
-
/*
* Divide a ktime value by a nanosecond value
*/
@@ -337,6 +282,7 @@ u64 ktime_divns(const ktime_t kt, s64 div)
return dclc;
}
+EXPORT_SYMBOL_GPL(ktime_divns);
#endif /* BITS_PER_LONG >= 64 */
/*
@@ -602,6 +548,11 @@ hrtimer_force_reprogram(struct hrtimer_cpu_base *cpu_base, int skip_equal)
* timers, we have to check, whether it expires earlier than the timer for
* which the clock event device was armed.
*
+ * Note, that in case the state has HRTIMER_STATE_CALLBACK set, no reprogramming
+ * and no expiry check happens. The timer gets enqueued into the rbtree. The
+ * reprogramming and expiry check is done in the hrtimer_interrupt or in the
+ * softirq.
+ *
* Called with interrupts disabled and base->cpu_base.lock held
*/
static int hrtimer_reprogram(struct hrtimer *timer,
@@ -662,25 +613,13 @@ static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base)
base->hres_active = 0;
}
-/*
- * When High resolution timers are active, try to reprogram. Note, that in case
- * the state has HRTIMER_STATE_CALLBACK set, no reprogramming and no expiry
- * check happens. The timer gets enqueued into the rbtree. The reprogramming
- * and expiry check is done in the hrtimer_interrupt or in the softirq.
- */
-static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
- struct hrtimer_clock_base *base)
-{
- return base->cpu_base->hres_active && hrtimer_reprogram(timer, base);
-}
-
static inline ktime_t hrtimer_update_base(struct hrtimer_cpu_base *base)
{
ktime_t *offs_real = &base->clock_base[HRTIMER_BASE_REALTIME].offset;
ktime_t *offs_boot = &base->clock_base[HRTIMER_BASE_BOOTTIME].offset;
ktime_t *offs_tai = &base->clock_base[HRTIMER_BASE_TAI].offset;
- return ktime_get_update_offsets(offs_real, offs_boot, offs_tai);
+ return ktime_get_update_offsets_now(offs_real, offs_boot, offs_tai);
}
/*
@@ -755,8 +694,8 @@ static inline int hrtimer_is_hres_enabled(void) { return 0; }
static inline int hrtimer_switch_to_hres(void) { return 0; }
static inline void
hrtimer_force_reprogram(struct hrtimer_cpu_base *base, int skip_equal) { }
-static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
- struct hrtimer_clock_base *base)
+static inline int hrtimer_reprogram(struct hrtimer *timer,
+ struct hrtimer_clock_base *base)
{
return 0;
}
@@ -1013,14 +952,25 @@ int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
leftmost = enqueue_hrtimer(timer, new_base);
- /*
- * Only allow reprogramming if the new base is on this CPU.
- * (it might still be on another CPU if the timer was pending)
- *
- * XXX send_remote_softirq() ?
- */
- if (leftmost && new_base->cpu_base == &__get_cpu_var(hrtimer_bases)
- && hrtimer_enqueue_reprogram(timer, new_base)) {
+ if (!leftmost) {
+ unlock_hrtimer_base(timer, &flags);
+ return ret;
+ }
+
+ if (!hrtimer_is_hres_active(timer)) {
+ /*
+ * Kick to reschedule the next tick to handle the new timer
+ * on dynticks target.
+ */
+ wake_up_nohz_cpu(new_base->cpu_base->cpu);
+ } else if (new_base->cpu_base == &__get_cpu_var(hrtimer_bases) &&
+ hrtimer_reprogram(timer, new_base)) {
+ /*
+ * Only allow reprogramming if the new base is on this CPU.
+ * (it might still be on another CPU if the timer was pending)
+ *
+ * XXX send_remote_softirq() ?
+ */
if (wakeup) {
/*
* We need to drop cpu_base->lock to avoid a
@@ -1680,6 +1630,7 @@ static void init_hrtimers_cpu(int cpu)
timerqueue_init_head(&cpu_base->clock_base[i].active);
}
+ cpu_base->cpu = cpu;
hrtimer_init_hres(cpu_base);
}
diff --git a/kernel/itimer.c b/kernel/time/itimer.c
index 8d262b467573..8d262b467573 100644
--- a/kernel/itimer.c
+++ b/kernel/time/itimer.c
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 33db43a39515..87a346fd6d61 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -466,7 +466,8 @@ static DECLARE_DELAYED_WORK(sync_cmos_work, sync_cmos_clock);
static void sync_cmos_clock(struct work_struct *work)
{
- struct timespec now, next;
+ struct timespec64 now;
+ struct timespec next;
int fail = 1;
/*
@@ -485,9 +486,9 @@ static void sync_cmos_clock(struct work_struct *work)
return;
}
- getnstimeofday(&now);
+ getnstimeofday64(&now);
if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec * 5) {
- struct timespec adjust = now;
+ struct timespec adjust = timespec64_to_timespec(now);
fail = -ENODEV;
if (persistent_clock_is_local)
@@ -531,7 +532,7 @@ void ntp_notify_cmos_timer(void) { }
/*
* Propagate a new txc->status value into the NTP state:
*/
-static inline void process_adj_status(struct timex *txc, struct timespec *ts)
+static inline void process_adj_status(struct timex *txc, struct timespec64 *ts)
{
if ((time_status & STA_PLL) && !(txc->status & STA_PLL)) {
time_state = TIME_OK;
@@ -554,7 +555,7 @@ static inline void process_adj_status(struct timex *txc, struct timespec *ts)
static inline void process_adjtimex_modes(struct timex *txc,
- struct timespec *ts,
+ struct timespec64 *ts,
s32 *time_tai)
{
if (txc->modes & ADJ_STATUS)
@@ -640,7 +641,7 @@ int ntp_validate_timex(struct timex *txc)
* adjtimex mainly allows reading (and writing, if superuser) of
* kernel time-keeping variables. used by xntpd.
*/
-int __do_adjtimex(struct timex *txc, struct timespec *ts, s32 *time_tai)
+int __do_adjtimex(struct timex *txc, struct timespec64 *ts, s32 *time_tai)
{
int result;
@@ -684,7 +685,7 @@ int __do_adjtimex(struct timex *txc, struct timespec *ts, s32 *time_tai)
/* fill PPS status fields */
pps_fill_timex(txc);
- txc->time.tv_sec = ts->tv_sec;
+ txc->time.tv_sec = (time_t)ts->tv_sec;
txc->time.tv_usec = ts->tv_nsec;
if (!(time_status & STA_NANO))
txc->time.tv_usec /= NSEC_PER_USEC;
diff --git a/kernel/time/ntp_internal.h b/kernel/time/ntp_internal.h
index 1950cb4ca2a4..bbd102ad9df7 100644
--- a/kernel/time/ntp_internal.h
+++ b/kernel/time/ntp_internal.h
@@ -7,6 +7,6 @@ extern void ntp_clear(void);
extern u64 ntp_tick_length(void);
extern int second_overflow(unsigned long secs);
extern int ntp_validate_timex(struct timex *);
-extern int __do_adjtimex(struct timex *, struct timespec *, s32 *);
+extern int __do_adjtimex(struct timex *, struct timespec64 *, s32 *);
extern void __hardpps(const struct timespec *, const struct timespec *);
#endif /* _LINUX_NTP_INTERNAL_H */
diff --git a/kernel/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 3b8946416a5f..3b8946416a5f 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
diff --git a/kernel/posix-timers.c b/kernel/time/posix-timers.c
index 424c2d4265c9..42b463ad90f2 100644
--- a/kernel/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -49,6 +49,8 @@
#include <linux/export.h>
#include <linux/hashtable.h>
+#include "timekeeping.h"
+
/*
* Management arrays for POSIX timers. Timers are now kept in static hash table
* with 512 entries.
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index 7ab92b19965a..c19c1d84b6f3 100644
--- a/kernel/time/tick-internal.h
+++ b/kernel/time/tick-internal.h
@@ -4,6 +4,8 @@
#include <linux/hrtimer.h>
#include <linux/tick.h>
+#include "timekeeping.h"
+
extern seqlock_t jiffies_lock;
#define CS_NAME_LEN 32
diff --git a/kernel/time.c b/kernel/time/time.c
index 7c7964c33ae7..f0294ba14634 100644
--- a/kernel/time.c
+++ b/kernel/time/time.c
@@ -42,6 +42,7 @@
#include <asm/unistd.h>
#include "timeconst.h"
+#include "timekeeping.h"
/*
* The timezone where the local system is located. Used as a default by some
@@ -420,6 +421,68 @@ struct timeval ns_to_timeval(const s64 nsec)
}
EXPORT_SYMBOL(ns_to_timeval);
+#if BITS_PER_LONG == 32
+/**
+ * set_normalized_timespec - set timespec sec and nsec parts and normalize
+ *
+ * @ts: pointer to timespec variable to be set
+ * @sec: seconds to set
+ * @nsec: nanoseconds to set
+ *
+ * Set seconds and nanoseconds field of a timespec variable and
+ * normalize to the timespec storage format
+ *
+ * Note: The tv_nsec part is always in the range of
+ * 0 <= tv_nsec < NSEC_PER_SEC
+ * For negative values only the tv_sec field is negative !
+ */
+void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec)
+{
+ while (nsec >= NSEC_PER_SEC) {
+ /*
+ * The following asm() prevents the compiler from
+ * optimising this loop into a modulo operation. See
+ * also __iter_div_u64_rem() in include/linux/time.h
+ */
+ asm("" : "+rm"(nsec));
+ nsec -= NSEC_PER_SEC;
+ ++sec;
+ }
+ while (nsec < 0) {
+ asm("" : "+rm"(nsec));
+ nsec += NSEC_PER_SEC;
+ --sec;
+ }
+ ts->tv_sec = sec;
+ ts->tv_nsec = nsec;
+}
+EXPORT_SYMBOL(set_normalized_timespec64);
+
+/**
+ * ns_to_timespec64 - Convert nanoseconds to timespec64
+ * @nsec: the nanoseconds value to be converted
+ *
+ * Returns the timespec64 representation of the nsec parameter.
+ */
+struct timespec64 ns_to_timespec64(const s64 nsec)
+{
+ struct timespec64 ts;
+ s32 rem;
+
+ if (!nsec)
+ return (struct timespec64) {0, 0};
+
+ ts.tv_sec = div_s64_rem(nsec, NSEC_PER_SEC, &rem);
+ if (unlikely(rem < 0)) {
+ ts.tv_sec--;
+ rem += NSEC_PER_SEC;
+ }
+ ts.tv_nsec = rem;
+
+ return ts;
+}
+EXPORT_SYMBOL(ns_to_timespec64);
+#endif
/*
* When we convert to jiffies then we interpret incoming values
* the following way:
@@ -694,6 +757,7 @@ unsigned long nsecs_to_jiffies(u64 n)
{
return (unsigned long)nsecs_to_jiffies64(n);
}
+EXPORT_SYMBOL_GPL(nsecs_to_jiffies);
/*
* Add two timespec values and do a safety check for overflow.
diff --git a/kernel/timeconst.bc b/kernel/time/timeconst.bc
index 511bdf2cafda..511bdf2cafda 100644
--- a/kernel/timeconst.bc
+++ b/kernel/time/timeconst.bc
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 32d8d6aaedb8..f36b02838a47 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -32,11 +32,34 @@
#define TK_MIRROR (1 << 1)
#define TK_CLOCK_WAS_SET (1 << 2)
-static struct timekeeper timekeeper;
+/*
+ * The most important data for readout fits into a single 64 byte
+ * cache line.
+ */
+static struct {
+ seqcount_t seq;
+ struct timekeeper timekeeper;
+} tk_core ____cacheline_aligned;
+
static DEFINE_RAW_SPINLOCK(timekeeper_lock);
-static seqcount_t timekeeper_seq;
static struct timekeeper shadow_timekeeper;
+/**
+ * struct tk_fast - NMI safe timekeeper
+ * @seq: Sequence counter for protecting updates. The lowest bit
+ * is the index for the tk_read_base array
+ * @base: tk_read_base array. Access is indexed by the lowest bit of
+ * @seq.
+ *
+ * See @update_fast_timekeeper() below.
+ */
+struct tk_fast {
+ seqcount_t seq;
+ struct tk_read_base base[2];
+};
+
+static struct tk_fast tk_fast_mono ____cacheline_aligned;
+
/* flag for if timekeeping is suspended */
int __read_mostly timekeeping_suspended;
@@ -45,49 +68,54 @@ bool __read_mostly persistent_clock_exist = false;
static inline void tk_normalize_xtime(struct timekeeper *tk)
{
- while (tk->xtime_nsec >= ((u64)NSEC_PER_SEC << tk->shift)) {
- tk->xtime_nsec -= (u64)NSEC_PER_SEC << tk->shift;
+ while (tk->tkr.xtime_nsec >= ((u64)NSEC_PER_SEC << tk->tkr.shift)) {
+ tk->tkr.xtime_nsec -= (u64)NSEC_PER_SEC << tk->tkr.shift;
tk->xtime_sec++;
}
}
-static void tk_set_xtime(struct timekeeper *tk, const struct timespec *ts)
+static inline struct timespec64 tk_xtime(struct timekeeper *tk)
+{
+ struct timespec64 ts;
+
+ ts.tv_sec = tk->xtime_sec;
+ ts.tv_nsec = (long)(tk->tkr.xtime_nsec >> tk->tkr.shift);
+ return ts;
+}
+
+static void tk_set_xtime(struct timekeeper *tk, const struct timespec64 *ts)
{
tk->xtime_sec = ts->tv_sec;
- tk->xtime_nsec = (u64)ts->tv_nsec << tk->shift;
+ tk->tkr.xtime_nsec = (u64)ts->tv_nsec << tk->tkr.shift;
}
-static void tk_xtime_add(struct timekeeper *tk, const struct timespec *ts)
+static void tk_xtime_add(struct timekeeper *tk, const struct timespec64 *ts)
{
tk->xtime_sec += ts->tv_sec;
- tk->xtime_nsec += (u64)ts->tv_nsec << tk->shift;
+ tk->tkr.xtime_nsec += (u64)ts->tv_nsec << tk->tkr.shift;
tk_normalize_xtime(tk);
}
-static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec wtm)
+static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec64 wtm)
{
- struct timespec tmp;
+ struct timespec64 tmp;
/*
* Verify consistency of: offset_real = -wall_to_monotonic
* before modifying anything
*/
- set_normalized_timespec(&tmp, -tk->wall_to_monotonic.tv_sec,
+ set_normalized_timespec64(&tmp, -tk->wall_to_monotonic.tv_sec,
-tk->wall_to_monotonic.tv_nsec);
- WARN_ON_ONCE(tk->offs_real.tv64 != timespec_to_ktime(tmp).tv64);
+ WARN_ON_ONCE(tk->offs_real.tv64 != timespec64_to_ktime(tmp).tv64);
tk->wall_to_monotonic = wtm;
- set_normalized_timespec(&tmp, -wtm.tv_sec, -wtm.tv_nsec);
- tk->offs_real = timespec_to_ktime(tmp);
+ set_normalized_timespec64(&tmp, -wtm.tv_sec, -wtm.tv_nsec);
+ tk->offs_real = timespec64_to_ktime(tmp);
tk->offs_tai = ktime_add(tk->offs_real, ktime_set(tk->tai_offset, 0));
}
-static void tk_set_sleep_time(struct timekeeper *tk, struct timespec t)
+static inline void tk_update_sleep_time(struct timekeeper *tk, ktime_t delta)
{
- /* Verify consistency before modifying */
- WARN_ON_ONCE(tk->offs_boot.tv64 != timespec_to_ktime(tk->total_sleep_time).tv64);
-
- tk->total_sleep_time = t;
- tk->offs_boot = timespec_to_ktime(t);
+ tk->offs_boot = ktime_add(tk->offs_boot, delta);
}
/**
@@ -107,9 +135,11 @@ static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock)
u64 tmp, ntpinterval;
struct clocksource *old_clock;
- old_clock = tk->clock;
- tk->clock = clock;
- tk->cycle_last = clock->cycle_last = clock->read(clock);
+ old_clock = tk->tkr.clock;
+ tk->tkr.clock = clock;
+ tk->tkr.read = clock->read;
+ tk->tkr.mask = clock->mask;
+ tk->tkr.cycle_last = tk->tkr.read(clock);
/* Do the ns -> cycle conversion first, using original mult */
tmp = NTP_INTERVAL_LENGTH;
@@ -133,78 +163,212 @@ static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock)
if (old_clock) {
int shift_change = clock->shift - old_clock->shift;
if (shift_change < 0)
- tk->xtime_nsec >>= -shift_change;
+ tk->tkr.xtime_nsec >>= -shift_change;
else
- tk->xtime_nsec <<= shift_change;
+ tk->tkr.xtime_nsec <<= shift_change;
}
- tk->shift = clock->shift;
+ tk->tkr.shift = clock->shift;
tk->ntp_error = 0;
tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift;
+ tk->ntp_tick = ntpinterval << tk->ntp_error_shift;
/*
* The timekeeper keeps its own mult values for the currently
* active clocksource. These value will be adjusted via NTP
* to counteract clock drifting.
*/
- tk->mult = clock->mult;
+ tk->tkr.mult = clock->mult;
+ tk->ntp_err_mult = 0;
}
/* Timekeeper helper functions. */
#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
-u32 (*arch_gettimeoffset)(void);
-
-u32 get_arch_timeoffset(void)
-{
- if (likely(arch_gettimeoffset))
- return arch_gettimeoffset();
- return 0;
-}
+static u32 default_arch_gettimeoffset(void) { return 0; }
+u32 (*arch_gettimeoffset)(void) = default_arch_gettimeoffset;
#else
-static inline u32 get_arch_timeoffset(void) { return 0; }
+static inline u32 arch_gettimeoffset(void) { return 0; }
#endif
-static inline s64 timekeeping_get_ns(struct timekeeper *tk)
+static inline s64 timekeeping_get_ns(struct tk_read_base *tkr)
{
- cycle_t cycle_now, cycle_delta;
- struct clocksource *clock;
+ cycle_t cycle_now, delta;
s64 nsec;
/* read clocksource: */
- clock = tk->clock;
- cycle_now = clock->read(clock);
+ cycle_now = tkr->read(tkr->clock);
/* calculate the delta since the last update_wall_time: */
- cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
+ delta = clocksource_delta(cycle_now, tkr->cycle_last, tkr->mask);
- nsec = cycle_delta * tk->mult + tk->xtime_nsec;
- nsec >>= tk->shift;
+ nsec = delta * tkr->mult + tkr->xtime_nsec;
+ nsec >>= tkr->shift;
/* If arch requires, add in get_arch_timeoffset() */
- return nsec + get_arch_timeoffset();
+ return nsec + arch_gettimeoffset();
}
static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk)
{
- cycle_t cycle_now, cycle_delta;
- struct clocksource *clock;
+ struct clocksource *clock = tk->tkr.clock;
+ cycle_t cycle_now, delta;
s64 nsec;
/* read clocksource: */
- clock = tk->clock;
- cycle_now = clock->read(clock);
+ cycle_now = tk->tkr.read(clock);
/* calculate the delta since the last update_wall_time: */
- cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
+ delta = clocksource_delta(cycle_now, tk->tkr.cycle_last, tk->tkr.mask);
/* convert delta to nanoseconds. */
- nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift);
+ nsec = clocksource_cyc2ns(delta, clock->mult, clock->shift);
/* If arch requires, add in get_arch_timeoffset() */
- return nsec + get_arch_timeoffset();
+ return nsec + arch_gettimeoffset();
+}
+
+/**
+ * update_fast_timekeeper - Update the fast and NMI safe monotonic timekeeper.
+ * @tk: The timekeeper from which we take the update
+ * @tkf: The fast timekeeper to update
+ * @tbase: The time base for the fast timekeeper (mono/raw)
+ *
+ * We want to use this from any context including NMI and tracing /
+ * instrumenting the timekeeping code itself.
+ *
+ * So we handle this differently than the other timekeeping accessor
+ * functions which retry when the sequence count has changed. The
+ * update side does:
+ *
+ * smp_wmb(); <- Ensure that the last base[1] update is visible
+ * tkf->seq++;
+ * smp_wmb(); <- Ensure that the seqcount update is visible
+ * update(tkf->base[0], tk);
+ * smp_wmb(); <- Ensure that the base[0] update is visible
+ * tkf->seq++;
+ * smp_wmb(); <- Ensure that the seqcount update is visible
+ * update(tkf->base[1], tk);
+ *
+ * The reader side does:
+ *
+ * do {
+ * seq = tkf->seq;
+ * smp_rmb();
+ * idx = seq & 0x01;
+ * now = now(tkf->base[idx]);
+ * smp_rmb();
+ * } while (seq != tkf->seq)
+ *
+ * As long as we update base[0] readers are forced off to
+ * base[1]. Once base[0] is updated readers are redirected to base[0]
+ * and the base[1] update takes place.
+ *
+ * So if a NMI hits the update of base[0] then it will use base[1]
+ * which is still consistent. In the worst case this can result is a
+ * slightly wrong timestamp (a few nanoseconds). See
+ * @ktime_get_mono_fast_ns.
+ */
+static void update_fast_timekeeper(struct timekeeper *tk)
+{
+ struct tk_read_base *base = tk_fast_mono.base;
+
+ /* Force readers off to base[1] */
+ raw_write_seqcount_latch(&tk_fast_mono.seq);
+
+ /* Update base[0] */
+ memcpy(base, &tk->tkr, sizeof(*base));
+
+ /* Force readers back to base[0] */
+ raw_write_seqcount_latch(&tk_fast_mono.seq);
+
+ /* Update base[1] */
+ memcpy(base + 1, base, sizeof(*base));
}
+/**
+ * ktime_get_mono_fast_ns - Fast NMI safe access to clock monotonic
+ *
+ * This timestamp is not guaranteed to be monotonic across an update.
+ * The timestamp is calculated by:
+ *
+ * now = base_mono + clock_delta * slope
+ *
+ * So if the update lowers the slope, readers who are forced to the
+ * not yet updated second array are still using the old steeper slope.
+ *
+ * tmono
+ * ^
+ * | o n
+ * | o n
+ * | u
+ * | o
+ * |o
+ * |12345678---> reader order
+ *
+ * o = old slope
+ * u = update
+ * n = new slope
+ *
+ * So reader 6 will observe time going backwards versus reader 5.
+ *
+ * While other CPUs are likely to be able observe that, the only way
+ * for a CPU local observation is when an NMI hits in the middle of
+ * the update. Timestamps taken from that NMI context might be ahead
+ * of the following timestamps. Callers need to be aware of that and
+ * deal with it.
+ */
+u64 notrace ktime_get_mono_fast_ns(void)
+{
+ struct tk_read_base *tkr;
+ unsigned int seq;
+ u64 now;
+
+ do {
+ seq = raw_read_seqcount(&tk_fast_mono.seq);
+ tkr = tk_fast_mono.base + (seq & 0x01);
+ now = ktime_to_ns(tkr->base_mono) + timekeeping_get_ns(tkr);
+
+ } while (read_seqcount_retry(&tk_fast_mono.seq, seq));
+ return now;
+}
+EXPORT_SYMBOL_GPL(ktime_get_mono_fast_ns);
+
+#ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD
+
+static inline void update_vsyscall(struct timekeeper *tk)
+{
+ struct timespec xt;
+
+ xt = timespec64_to_timespec(tk_xtime(tk));
+ update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->tkr.clock, tk->tkr.mult,
+ tk->tkr.cycle_last);
+}
+
+static inline void old_vsyscall_fixup(struct timekeeper *tk)
+{
+ s64 remainder;
+
+ /*
+ * Store only full nanoseconds into xtime_nsec after rounding
+ * it up and add the remainder to the error difference.
+ * XXX - This is necessary to avoid small 1ns inconsistnecies caused
+ * by truncating the remainder in vsyscalls. However, it causes
+ * additional work to be done in timekeeping_adjust(). Once
+ * the vsyscall implementations are converted to use xtime_nsec
+ * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD
+ * users are removed, this can be killed.
+ */
+ remainder = tk->tkr.xtime_nsec & ((1ULL << tk->tkr.shift) - 1);
+ tk->tkr.xtime_nsec -= remainder;
+ tk->tkr.xtime_nsec += 1ULL << tk->tkr.shift;
+ tk->ntp_error += remainder << tk->ntp_error_shift;
+ tk->ntp_error -= (1ULL << tk->tkr.shift) << tk->ntp_error_shift;
+}
+#else
+#define old_vsyscall_fixup(tk)
+#endif
+
static RAW_NOTIFIER_HEAD(pvclock_gtod_chain);
static void update_pvclock_gtod(struct timekeeper *tk, bool was_set)
@@ -217,7 +381,7 @@ static void update_pvclock_gtod(struct timekeeper *tk, bool was_set)
*/
int pvclock_gtod_register_notifier(struct notifier_block *nb)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned long flags;
int ret;
@@ -247,6 +411,29 @@ int pvclock_gtod_unregister_notifier(struct notifier_block *nb)
}
EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier);
+/*
+ * Update the ktime_t based scalar nsec members of the timekeeper
+ */
+static inline void tk_update_ktime_data(struct timekeeper *tk)
+{
+ s64 nsec;
+
+ /*
+ * The xtime based monotonic readout is:
+ * nsec = (xtime_sec + wtm_sec) * 1e9 + wtm_nsec + now();
+ * The ktime based monotonic readout is:
+ * nsec = base_mono + now();
+ * ==> base_mono = (xtime_sec + wtm_sec) * 1e9 + wtm_nsec
+ */
+ nsec = (s64)(tk->xtime_sec + tk->wall_to_monotonic.tv_sec);
+ nsec *= NSEC_PER_SEC;
+ nsec += tk->wall_to_monotonic.tv_nsec;
+ tk->tkr.base_mono = ns_to_ktime(nsec);
+
+ /* Update the monotonic raw base */
+ tk->base_raw = timespec64_to_ktime(tk->raw_time);
+}
+
/* must hold timekeeper_lock */
static void timekeeping_update(struct timekeeper *tk, unsigned int action)
{
@@ -257,8 +444,13 @@ static void timekeeping_update(struct timekeeper *tk, unsigned int action)
update_vsyscall(tk);
update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET);
+ tk_update_ktime_data(tk);
+
if (action & TK_MIRROR)
- memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper));
+ memcpy(&shadow_timekeeper, &tk_core.timekeeper,
+ sizeof(tk_core.timekeeper));
+
+ update_fast_timekeeper(tk);
}
/**
@@ -270,49 +462,48 @@ static void timekeeping_update(struct timekeeper *tk, unsigned int action)
*/
static void timekeeping_forward_now(struct timekeeper *tk)
{
- cycle_t cycle_now, cycle_delta;
- struct clocksource *clock;
+ struct clocksource *clock = tk->tkr.clock;
+ cycle_t cycle_now, delta;
s64 nsec;
- clock = tk->clock;
- cycle_now = clock->read(clock);
- cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
- tk->cycle_last = clock->cycle_last = cycle_now;
+ cycle_now = tk->tkr.read(clock);
+ delta = clocksource_delta(cycle_now, tk->tkr.cycle_last, tk->tkr.mask);
+ tk->tkr.cycle_last = cycle_now;
- tk->xtime_nsec += cycle_delta * tk->mult;
+ tk->tkr.xtime_nsec += delta * tk->tkr.mult;
/* If arch requires, add in get_arch_timeoffset() */
- tk->xtime_nsec += (u64)get_arch_timeoffset() << tk->shift;
+ tk->tkr.xtime_nsec += (u64)arch_gettimeoffset() << tk->tkr.shift;
tk_normalize_xtime(tk);
- nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift);
- timespec_add_ns(&tk->raw_time, nsec);
+ nsec = clocksource_cyc2ns(delta, clock->mult, clock->shift);
+ timespec64_add_ns(&tk->raw_time, nsec);
}
/**
- * __getnstimeofday - Returns the time of day in a timespec.
+ * __getnstimeofday64 - Returns the time of day in a timespec64.
* @ts: pointer to the timespec to be set
*
* Updates the time of day in the timespec.
* Returns 0 on success, or -ve when suspended (timespec will be undefined).
*/
-int __getnstimeofday(struct timespec *ts)
+int __getnstimeofday64(struct timespec64 *ts)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned long seq;
s64 nsecs = 0;
do {
- seq = read_seqcount_begin(&timekeeper_seq);
+ seq = read_seqcount_begin(&tk_core.seq);
ts->tv_sec = tk->xtime_sec;
- nsecs = timekeeping_get_ns(tk);
+ nsecs = timekeeping_get_ns(&tk->tkr);
- } while (read_seqcount_retry(&timekeeper_seq, seq));
+ } while (read_seqcount_retry(&tk_core.seq, seq));
ts->tv_nsec = 0;
- timespec_add_ns(ts, nsecs);
+ timespec64_add_ns(ts, nsecs);
/*
* Do not bail out early, in case there were callers still using
@@ -322,116 +513,138 @@ int __getnstimeofday(struct timespec *ts)
return -EAGAIN;
return 0;
}
-EXPORT_SYMBOL(__getnstimeofday);
+EXPORT_SYMBOL(__getnstimeofday64);
/**
- * getnstimeofday - Returns the time of day in a timespec.
+ * getnstimeofday64 - Returns the time of day in a timespec64.
* @ts: pointer to the timespec to be set
*
* Returns the time of day in a timespec (WARN if suspended).
*/
-void getnstimeofday(struct timespec *ts)
+void getnstimeofday64(struct timespec64 *ts)
{
- WARN_ON(__getnstimeofday(ts));
+ WARN_ON(__getnstimeofday64(ts));
}
-EXPORT_SYMBOL(getnstimeofday);
+EXPORT_SYMBOL(getnstimeofday64);
ktime_t ktime_get(void)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned int seq;
- s64 secs, nsecs;
+ ktime_t base;
+ s64 nsecs;
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqcount_begin(&timekeeper_seq);
- secs = tk->xtime_sec + tk->wall_to_monotonic.tv_sec;
- nsecs = timekeeping_get_ns(tk) + tk->wall_to_monotonic.tv_nsec;
+ seq = read_seqcount_begin(&tk_core.seq);
+ base = tk->tkr.base_mono;
+ nsecs = timekeeping_get_ns(&tk->tkr);
- } while (read_seqcount_retry(&timekeeper_seq, seq));
- /*
- * Use ktime_set/ktime_add_ns to create a proper ktime on
- * 32-bit architectures without CONFIG_KTIME_SCALAR.
- */
- return ktime_add_ns(ktime_set(secs, 0), nsecs);
+ } while (read_seqcount_retry(&tk_core.seq, seq));
+
+ return ktime_add_ns(base, nsecs);
}
EXPORT_SYMBOL_GPL(ktime_get);
-/**
- * ktime_get_ts - get the monotonic clock in timespec format
- * @ts: pointer to timespec variable
- *
- * The function calculates the monotonic clock from the realtime
- * clock and the wall_to_monotonic offset and stores the result
- * in normalized timespec format in the variable pointed to by @ts.
- */
-void ktime_get_ts(struct timespec *ts)
+static ktime_t *offsets[TK_OFFS_MAX] = {
+ [TK_OFFS_REAL] = &tk_core.timekeeper.offs_real,
+ [TK_OFFS_BOOT] = &tk_core.timekeeper.offs_boot,
+ [TK_OFFS_TAI] = &tk_core.timekeeper.offs_tai,
+};
+
+ktime_t ktime_get_with_offset(enum tk_offsets offs)
{
- struct timekeeper *tk = &timekeeper;
- struct timespec tomono;
- s64 nsec;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned int seq;
+ ktime_t base, *offset = offsets[offs];
+ s64 nsecs;
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqcount_begin(&timekeeper_seq);
- ts->tv_sec = tk->xtime_sec;
- nsec = timekeeping_get_ns(tk);
- tomono = tk->wall_to_monotonic;
+ seq = read_seqcount_begin(&tk_core.seq);
+ base = ktime_add(tk->tkr.base_mono, *offset);
+ nsecs = timekeeping_get_ns(&tk->tkr);
- } while (read_seqcount_retry(&timekeeper_seq, seq));
+ } while (read_seqcount_retry(&tk_core.seq, seq));
- ts->tv_sec += tomono.tv_sec;
- ts->tv_nsec = 0;
- timespec_add_ns(ts, nsec + tomono.tv_nsec);
-}
-EXPORT_SYMBOL_GPL(ktime_get_ts);
+ return ktime_add_ns(base, nsecs);
+}
+EXPORT_SYMBOL_GPL(ktime_get_with_offset);
/**
- * timekeeping_clocktai - Returns the TAI time of day in a timespec
- * @ts: pointer to the timespec to be set
- *
- * Returns the time of day in a timespec.
+ * ktime_mono_to_any() - convert mononotic time to any other time
+ * @tmono: time to convert.
+ * @offs: which offset to use
*/
-void timekeeping_clocktai(struct timespec *ts)
+ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs)
{
- struct timekeeper *tk = &timekeeper;
+ ktime_t *offset = offsets[offs];
unsigned long seq;
- u64 nsecs;
-
- WARN_ON(timekeeping_suspended);
+ ktime_t tconv;
do {
- seq = read_seqcount_begin(&timekeeper_seq);
+ seq = read_seqcount_begin(&tk_core.seq);
+ tconv = ktime_add(tmono, *offset);
+ } while (read_seqcount_retry(&tk_core.seq, seq));
- ts->tv_sec = tk->xtime_sec + tk->tai_offset;
- nsecs = timekeeping_get_ns(tk);
+ return tconv;
+}
+EXPORT_SYMBOL_GPL(ktime_mono_to_any);
- } while (read_seqcount_retry(&timekeeper_seq, seq));
+/**
+ * ktime_get_raw - Returns the raw monotonic time in ktime_t format
+ */
+ktime_t ktime_get_raw(void)
+{
+ struct timekeeper *tk = &tk_core.timekeeper;
+ unsigned int seq;
+ ktime_t base;
+ s64 nsecs;
- ts->tv_nsec = 0;
- timespec_add_ns(ts, nsecs);
+ do {
+ seq = read_seqcount_begin(&tk_core.seq);
+ base = tk->base_raw;
+ nsecs = timekeeping_get_ns_raw(tk);
-}
-EXPORT_SYMBOL(timekeeping_clocktai);
+ } while (read_seqcount_retry(&tk_core.seq, seq));
+ return ktime_add_ns(base, nsecs);
+}
+EXPORT_SYMBOL_GPL(ktime_get_raw);
/**
- * ktime_get_clocktai - Returns the TAI time of day in a ktime
+ * ktime_get_ts64 - get the monotonic clock in timespec64 format
+ * @ts: pointer to timespec variable
*
- * Returns the time of day in a ktime.
+ * The function calculates the monotonic clock from the realtime
+ * clock and the wall_to_monotonic offset and stores the result
+ * in normalized timespec format in the variable pointed to by @ts.
*/
-ktime_t ktime_get_clocktai(void)
+void ktime_get_ts64(struct timespec64 *ts)
{
- struct timespec ts;
+ struct timekeeper *tk = &tk_core.timekeeper;
+ struct timespec64 tomono;
+ s64 nsec;
+ unsigned int seq;
+
+ WARN_ON(timekeeping_suspended);
- timekeeping_clocktai(&ts);
- return timespec_to_ktime(ts);
+ do {
+ seq = read_seqcount_begin(&tk_core.seq);
+ ts->tv_sec = tk->xtime_sec;
+ nsec = timekeeping_get_ns(&tk->tkr);
+ tomono = tk->wall_to_monotonic;
+
+ } while (read_seqcount_retry(&tk_core.seq, seq));
+
+ ts->tv_sec += tomono.tv_sec;
+ ts->tv_nsec = 0;
+ timespec64_add_ns(ts, nsec + tomono.tv_nsec);
}
-EXPORT_SYMBOL(ktime_get_clocktai);
+EXPORT_SYMBOL_GPL(ktime_get_ts64);
#ifdef CONFIG_NTP_PPS
@@ -446,23 +659,23 @@ EXPORT_SYMBOL(ktime_get_clocktai);
*/
void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned long seq;
s64 nsecs_raw, nsecs_real;
WARN_ON_ONCE(timekeeping_suspended);
do {
- seq = read_seqcount_begin(&timekeeper_seq);
+ seq = read_seqcount_begin(&tk_core.seq);
- *ts_raw = tk->raw_time;
+ *ts_raw = timespec64_to_timespec(tk->raw_time);
ts_real->tv_sec = tk->xtime_sec;
ts_real->tv_nsec = 0;
nsecs_raw = timekeeping_get_ns_raw(tk);
- nsecs_real = timekeeping_get_ns(tk);
+ nsecs_real = timekeeping_get_ns(&tk->tkr);
- } while (read_seqcount_retry(&timekeeper_seq, seq));
+ } while (read_seqcount_retry(&tk_core.seq, seq));
timespec_add_ns(ts_raw, nsecs_raw);
timespec_add_ns(ts_real, nsecs_real);
@@ -479,9 +692,9 @@ EXPORT_SYMBOL(getnstime_raw_and_real);
*/
void do_gettimeofday(struct timeval *tv)
{
- struct timespec now;
+ struct timespec64 now;
- getnstimeofday(&now);
+ getnstimeofday64(&now);
tv->tv_sec = now.tv_sec;
tv->tv_usec = now.tv_nsec/1000;
}
@@ -495,15 +708,15 @@ EXPORT_SYMBOL(do_gettimeofday);
*/
int do_settimeofday(const struct timespec *tv)
{
- struct timekeeper *tk = &timekeeper;
- struct timespec ts_delta, xt;
+ struct timekeeper *tk = &tk_core.timekeeper;
+ struct timespec64 ts_delta, xt, tmp;
unsigned long flags;
if (!timespec_valid_strict(tv))
return -EINVAL;
raw_spin_lock_irqsave(&timekeeper_lock, flags);
- write_seqcount_begin(&timekeeper_seq);
+ write_seqcount_begin(&tk_core.seq);
timekeeping_forward_now(tk);
@@ -511,13 +724,14 @@ int do_settimeofday(const struct timespec *tv)
ts_delta.tv_sec = tv->tv_sec - xt.tv_sec;
ts_delta.tv_nsec = tv->tv_nsec - xt.tv_nsec;
- tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, ts_delta));
+ tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, ts_delta));
- tk_set_xtime(tk, tv);
+ tmp = timespec_to_timespec64(*tv);
+ tk_set_xtime(tk, &tmp);
timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
- write_seqcount_end(&timekeeper_seq);
+ write_seqcount_end(&tk_core.seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
/* signal hrtimers about time change */
@@ -535,33 +749,35 @@ EXPORT_SYMBOL(do_settimeofday);
*/
int timekeeping_inject_offset(struct timespec *ts)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned long flags;
- struct timespec tmp;
+ struct timespec64 ts64, tmp;
int ret = 0;
if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
+ ts64 = timespec_to_timespec64(*ts);
+
raw_spin_lock_irqsave(&timekeeper_lock, flags);
- write_seqcount_begin(&timekeeper_seq);
+ write_seqcount_begin(&tk_core.seq);
timekeeping_forward_now(tk);
/* Make sure the proposed value is valid */
- tmp = timespec_add(tk_xtime(tk), *ts);
- if (!timespec_valid_strict(&tmp)) {
+ tmp = timespec64_add(tk_xtime(tk), ts64);
+ if (!timespec64_valid_strict(&tmp)) {
ret = -EINVAL;
goto error;
}
- tk_xtime_add(tk, ts);
- tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *ts));
+ tk_xtime_add(tk, &ts64);
+ tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, ts64));
error: /* even if we error out, we forwarded the time, so call update */
timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
- write_seqcount_end(&timekeeper_seq);
+ write_seqcount_end(&tk_core.seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
/* signal hrtimers about time change */
@@ -578,14 +794,14 @@ EXPORT_SYMBOL(timekeeping_inject_offset);
*/
s32 timekeeping_get_tai_offset(void)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned int seq;
s32 ret;
do {
- seq = read_seqcount_begin(&timekeeper_seq);
+ seq = read_seqcount_begin(&tk_core.seq);
ret = tk->tai_offset;
- } while (read_seqcount_retry(&timekeeper_seq, seq));
+ } while (read_seqcount_retry(&tk_core.seq, seq));
return ret;
}
@@ -606,14 +822,14 @@ static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset)
*/
void timekeeping_set_tai_offset(s32 tai_offset)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned long flags;
raw_spin_lock_irqsave(&timekeeper_lock, flags);
- write_seqcount_begin(&timekeeper_seq);
+ write_seqcount_begin(&tk_core.seq);
__timekeeping_set_tai_offset(tk, tai_offset);
timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET);
- write_seqcount_end(&timekeeper_seq);
+ write_seqcount_end(&tk_core.seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
clock_was_set();
}
@@ -625,14 +841,14 @@ void timekeeping_set_tai_offset(s32 tai_offset)
*/
static int change_clocksource(void *data)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
struct clocksource *new, *old;
unsigned long flags;
new = (struct clocksource *) data;
raw_spin_lock_irqsave(&timekeeper_lock, flags);
- write_seqcount_begin(&timekeeper_seq);
+ write_seqcount_begin(&tk_core.seq);
timekeeping_forward_now(tk);
/*
@@ -641,7 +857,7 @@ static int change_clocksource(void *data)
*/
if (try_module_get(new->owner)) {
if (!new->enable || new->enable(new) == 0) {
- old = tk->clock;
+ old = tk->tkr.clock;
tk_setup_internals(tk, new);
if (old->disable)
old->disable(old);
@@ -652,7 +868,7 @@ static int change_clocksource(void *data)
}
timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
- write_seqcount_end(&timekeeper_seq);
+ write_seqcount_end(&tk_core.seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
return 0;
@@ -667,29 +883,14 @@ static int change_clocksource(void *data)
*/
int timekeeping_notify(struct clocksource *clock)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
- if (tk->clock == clock)
+ if (tk->tkr.clock == clock)
return 0;
stop_machine(change_clocksource, clock, NULL);
tick_clock_notify();
- return tk->clock == clock ? 0 : -1;
-}
-
-/**
- * ktime_get_real - get the real (wall-) time in ktime_t format
- *
- * returns the time in ktime_t format
- */
-ktime_t ktime_get_real(void)
-{
- struct timespec now;
-
- getnstimeofday(&now);
-
- return timespec_to_ktime(now);
+ return tk->tkr.clock == clock ? 0 : -1;
}
-EXPORT_SYMBOL_GPL(ktime_get_real);
/**
* getrawmonotonic - Returns the raw monotonic time in a timespec
@@ -699,18 +900,20 @@ EXPORT_SYMBOL_GPL(ktime_get_real);
*/
void getrawmonotonic(struct timespec *ts)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
+ struct timespec64 ts64;
unsigned long seq;
s64 nsecs;
do {
- seq = read_seqcount_begin(&timekeeper_seq);
+ seq = read_seqcount_begin(&tk_core.seq);
nsecs = timekeeping_get_ns_raw(tk);
- *ts = tk->raw_time;
+ ts64 = tk->raw_time;
- } while (read_seqcount_retry(&timekeeper_seq, seq));
+ } while (read_seqcount_retry(&tk_core.seq, seq));
- timespec_add_ns(ts, nsecs);
+ timespec64_add_ns(&ts64, nsecs);
+ *ts = timespec64_to_timespec(ts64);
}
EXPORT_SYMBOL(getrawmonotonic);
@@ -719,16 +922,16 @@ EXPORT_SYMBOL(getrawmonotonic);
*/
int timekeeping_valid_for_hres(void)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned long seq;
int ret;
do {
- seq = read_seqcount_begin(&timekeeper_seq);
+ seq = read_seqcount_begin(&tk_core.seq);
- ret = tk->clock->flags & CLOCK_SOURCE_VALID_FOR_HRES;
+ ret = tk->tkr.clock->flags & CLOCK_SOURCE_VALID_FOR_HRES;
- } while (read_seqcount_retry(&timekeeper_seq, seq));
+ } while (read_seqcount_retry(&tk_core.seq, seq));
return ret;
}
@@ -738,16 +941,16 @@ int timekeeping_valid_for_hres(void)
*/
u64 timekeeping_max_deferment(void)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned long seq;
u64 ret;
do {
- seq = read_seqcount_begin(&timekeeper_seq);
+ seq = read_seqcount_begin(&tk_core.seq);
- ret = tk->clock->max_idle_ns;
+ ret = tk->tkr.clock->max_idle_ns;
- } while (read_seqcount_retry(&timekeeper_seq, seq));
+ } while (read_seqcount_retry(&tk_core.seq, seq));
return ret;
}
@@ -787,14 +990,15 @@ void __weak read_boot_clock(struct timespec *ts)
*/
void __init timekeeping_init(void)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
struct clocksource *clock;
unsigned long flags;
- struct timespec now, boot, tmp;
-
- read_persistent_clock(&now);
+ struct timespec64 now, boot, tmp;
+ struct timespec ts;
- if (!timespec_valid_strict(&now)) {
+ read_persistent_clock(&ts);
+ now = timespec_to_timespec64(ts);
+ if (!timespec64_valid_strict(&now)) {
pr_warn("WARNING: Persistent clock returned invalid value!\n"
" Check your CMOS/BIOS settings.\n");
now.tv_sec = 0;
@@ -802,8 +1006,9 @@ void __init timekeeping_init(void)
} else if (now.tv_sec || now.tv_nsec)
persistent_clock_exist = true;
- read_boot_clock(&boot);
- if (!timespec_valid_strict(&boot)) {
+ read_boot_clock(&ts);
+ boot = timespec_to_timespec64(ts);
+ if (!timespec64_valid_strict(&boot)) {
pr_warn("WARNING: Boot clock returned invalid value!\n"
" Check your CMOS/BIOS settings.\n");
boot.tv_sec = 0;
@@ -811,7 +1016,7 @@ void __init timekeeping_init(void)
}
raw_spin_lock_irqsave(&timekeeper_lock, flags);
- write_seqcount_begin(&timekeeper_seq);
+ write_seqcount_begin(&tk_core.seq);
ntp_init();
clock = clocksource_default_clock();
@@ -822,24 +1027,21 @@ void __init timekeeping_init(void)
tk_set_xtime(tk, &now);
tk->raw_time.tv_sec = 0;
tk->raw_time.tv_nsec = 0;
+ tk->base_raw.tv64 = 0;
if (boot.tv_sec == 0 && boot.tv_nsec == 0)
boot = tk_xtime(tk);
- set_normalized_timespec(&tmp, -boot.tv_sec, -boot.tv_nsec);
+ set_normalized_timespec64(&tmp, -boot.tv_sec, -boot.tv_nsec);
tk_set_wall_to_mono(tk, tmp);
- tmp.tv_sec = 0;
- tmp.tv_nsec = 0;
- tk_set_sleep_time(tk, tmp);
-
- memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper));
+ timekeeping_update(tk, TK_MIRROR);
- write_seqcount_end(&timekeeper_seq);
+ write_seqcount_end(&tk_core.seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
}
/* time in seconds when suspend began */
-static struct timespec timekeeping_suspend_time;
+static struct timespec64 timekeeping_suspend_time;
/**
* __timekeeping_inject_sleeptime - Internal function to add sleep interval
@@ -849,17 +1051,17 @@ static struct timespec timekeeping_suspend_time;
* adds the sleep offset to the timekeeping variables.
*/
static void __timekeeping_inject_sleeptime(struct timekeeper *tk,
- struct timespec *delta)
+ struct timespec64 *delta)
{
- if (!timespec_valid_strict(delta)) {
+ if (!timespec64_valid_strict(delta)) {
printk_deferred(KERN_WARNING
"__timekeeping_inject_sleeptime: Invalid "
"sleep delta value!\n");
return;
}
tk_xtime_add(tk, delta);
- tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *delta));
- tk_set_sleep_time(tk, timespec_add(tk->total_sleep_time, *delta));
+ tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, *delta));
+ tk_update_sleep_time(tk, timespec64_to_ktime(*delta));
tk_debug_account_sleep_time(delta);
}
@@ -875,7 +1077,8 @@ static void __timekeeping_inject_sleeptime(struct timekeeper *tk,
*/
void timekeeping_inject_sleeptime(struct timespec *delta)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
+ struct timespec64 tmp;
unsigned long flags;
/*
@@ -886,15 +1089,16 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
return;
raw_spin_lock_irqsave(&timekeeper_lock, flags);
- write_seqcount_begin(&timekeeper_seq);
+ write_seqcount_begin(&tk_core.seq);
timekeeping_forward_now(tk);
- __timekeeping_inject_sleeptime(tk, delta);
+ tmp = timespec_to_timespec64(*delta);
+ __timekeeping_inject_sleeptime(tk, &tmp);
timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
- write_seqcount_end(&timekeeper_seq);
+ write_seqcount_end(&tk_core.seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
/* signal hrtimers about time change */
@@ -910,20 +1114,22 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
*/
static void timekeeping_resume(void)
{
- struct timekeeper *tk = &timekeeper;
- struct clocksource *clock = tk->clock;
+ struct timekeeper *tk = &tk_core.timekeeper;
+ struct clocksource *clock = tk->tkr.clock;
unsigned long flags;
- struct timespec ts_new, ts_delta;
+ struct timespec64 ts_new, ts_delta;
+ struct timespec tmp;
cycle_t cycle_now, cycle_delta;
bool suspendtime_found = false;
- read_persistent_clock(&ts_new);
+ read_persistent_clock(&tmp);
+ ts_new = timespec_to_timespec64(tmp);
clockevents_resume();
clocksource_resume();
raw_spin_lock_irqsave(&timekeeper_lock, flags);
- write_seqcount_begin(&timekeeper_seq);
+ write_seqcount_begin(&tk_core.seq);
/*
* After system resumes, we need to calculate the suspended time and
@@ -937,15 +1143,16 @@ static void timekeeping_resume(void)
* The less preferred source will only be tried if there is no better
* usable source. The rtc part is handled separately in rtc core code.
*/
- cycle_now = clock->read(clock);
+ cycle_now = tk->tkr.read(clock);
if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) &&
- cycle_now > clock->cycle_last) {
+ cycle_now > tk->tkr.cycle_last) {
u64 num, max = ULLONG_MAX;
u32 mult = clock->mult;
u32 shift = clock->shift;
s64 nsec = 0;
- cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
+ cycle_delta = clocksource_delta(cycle_now, tk->tkr.cycle_last,
+ tk->tkr.mask);
/*
* "cycle_delta * mutl" may cause 64 bits overflow, if the
@@ -960,10 +1167,10 @@ static void timekeeping_resume(void)
}
nsec += ((u64) cycle_delta * mult) >> shift;
- ts_delta = ns_to_timespec(nsec);
+ ts_delta = ns_to_timespec64(nsec);
suspendtime_found = true;
- } else if (timespec_compare(&ts_new, &timekeeping_suspend_time) > 0) {
- ts_delta = timespec_sub(ts_new, timekeeping_suspend_time);
+ } else if (timespec64_compare(&ts_new, &timekeeping_suspend_time) > 0) {
+ ts_delta = timespec64_sub(ts_new, timekeeping_suspend_time);
suspendtime_found = true;
}
@@ -971,11 +1178,11 @@ static void timekeeping_resume(void)
__timekeeping_inject_sleeptime(tk, &ts_delta);
/* Re-base the last cycle value */
- tk->cycle_last = clock->cycle_last = cycle_now;
+ tk->tkr.cycle_last = cycle_now;
tk->ntp_error = 0;
timekeeping_suspended = 0;
timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET);
- write_seqcount_end(&timekeeper_seq);
+ write_seqcount_end(&tk_core.seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
touch_softlockup_watchdog();
@@ -988,12 +1195,14 @@ static void timekeeping_resume(void)
static int timekeeping_suspend(void)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned long flags;
- struct timespec delta, delta_delta;
- static struct timespec old_delta;
+ struct timespec64 delta, delta_delta;
+ static struct timespec64 old_delta;
+ struct timespec tmp;
- read_persistent_clock(&timekeeping_suspend_time);
+ read_persistent_clock(&tmp);
+ timekeeping_suspend_time = timespec_to_timespec64(tmp);
/*
* On some systems the persistent_clock can not be detected at
@@ -1004,7 +1213,7 @@ static int timekeeping_suspend(void)
persistent_clock_exist = true;
raw_spin_lock_irqsave(&timekeeper_lock, flags);
- write_seqcount_begin(&timekeeper_seq);
+ write_seqcount_begin(&tk_core.seq);
timekeeping_forward_now(tk);
timekeeping_suspended = 1;
@@ -1014,8 +1223,8 @@ static int timekeeping_suspend(void)
* try to compensate so the difference in system time
* and persistent_clock time stays close to constant.
*/
- delta = timespec_sub(tk_xtime(tk), timekeeping_suspend_time);
- delta_delta = timespec_sub(delta, old_delta);
+ delta = timespec64_sub(tk_xtime(tk), timekeeping_suspend_time);
+ delta_delta = timespec64_sub(delta, old_delta);
if (abs(delta_delta.tv_sec) >= 2) {
/*
* if delta_delta is too large, assume time correction
@@ -1025,11 +1234,11 @@ static int timekeeping_suspend(void)
} else {
/* Otherwise try to adjust old_system to compensate */
timekeeping_suspend_time =
- timespec_add(timekeeping_suspend_time, delta_delta);
+ timespec64_add(timekeeping_suspend_time, delta_delta);
}
timekeeping_update(tk, TK_MIRROR);
- write_seqcount_end(&timekeeper_seq);
+ write_seqcount_end(&tk_core.seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL);
@@ -1050,125 +1259,34 @@ static int __init timekeeping_init_ops(void)
register_syscore_ops(&timekeeping_syscore_ops);
return 0;
}
-
device_initcall(timekeeping_init_ops);
/*
- * If the error is already larger, we look ahead even further
- * to compensate for late or lost adjustments.
+ * Apply a multiplier adjustment to the timekeeper
*/
-static __always_inline int timekeeping_bigadjust(struct timekeeper *tk,
- s64 error, s64 *interval,
- s64 *offset)
+static __always_inline void timekeeping_apply_adjustment(struct timekeeper *tk,
+ s64 offset,
+ bool negative,
+ int adj_scale)
{
- s64 tick_error, i;
- u32 look_ahead, adj;
- s32 error2, mult;
-
- /*
- * Use the current error value to determine how much to look ahead.
- * The larger the error the slower we adjust for it to avoid problems
- * with losing too many ticks, otherwise we would overadjust and
- * produce an even larger error. The smaller the adjustment the
- * faster we try to adjust for it, as lost ticks can do less harm
- * here. This is tuned so that an error of about 1 msec is adjusted
- * within about 1 sec (or 2^20 nsec in 2^SHIFT_HZ ticks).
- */
- error2 = tk->ntp_error >> (NTP_SCALE_SHIFT + 22 - 2 * SHIFT_HZ);
- error2 = abs(error2);
- for (look_ahead = 0; error2 > 0; look_ahead++)
- error2 >>= 2;
+ s64 interval = tk->cycle_interval;
+ s32 mult_adj = 1;
- /*
- * Now calculate the error in (1 << look_ahead) ticks, but first
- * remove the single look ahead already included in the error.
- */
- tick_error = ntp_tick_length() >> (tk->ntp_error_shift + 1);
- tick_error -= tk->xtime_interval >> 1;
- error = ((error - tick_error) >> look_ahead) + tick_error;
-
- /* Finally calculate the adjustment shift value. */
- i = *interval;
- mult = 1;
- if (error < 0) {
- error = -error;
- *interval = -*interval;
- *offset = -*offset;
- mult = -1;
+ if (negative) {
+ mult_adj = -mult_adj;
+ interval = -interval;
+ offset = -offset;
}
- for (adj = 0; error > i; adj++)
- error >>= 1;
-
- *interval <<= adj;
- *offset <<= adj;
- return mult << adj;
-}
-
-/*
- * Adjust the multiplier to reduce the error value,
- * this is optimized for the most common adjustments of -1,0,1,
- * for other values we can do a bit more work.
- */
-static void timekeeping_adjust(struct timekeeper *tk, s64 offset)
-{
- s64 error, interval = tk->cycle_interval;
- int adj;
+ mult_adj <<= adj_scale;
+ interval <<= adj_scale;
+ offset <<= adj_scale;
/*
- * The point of this is to check if the error is greater than half
- * an interval.
- *
- * First we shift it down from NTP_SHIFT to clocksource->shifted nsecs.
- *
- * Note we subtract one in the shift, so that error is really error*2.
- * This "saves" dividing(shifting) interval twice, but keeps the
- * (error > interval) comparison as still measuring if error is
- * larger than half an interval.
- *
- * Note: It does not "save" on aggravation when reading the code.
- */
- error = tk->ntp_error >> (tk->ntp_error_shift - 1);
- if (error > interval) {
- /*
- * We now divide error by 4(via shift), which checks if
- * the error is greater than twice the interval.
- * If it is greater, we need a bigadjust, if its smaller,
- * we can adjust by 1.
- */
- error >>= 2;
- if (likely(error <= interval))
- adj = 1;
- else
- adj = timekeeping_bigadjust(tk, error, &interval, &offset);
- } else {
- if (error < -interval) {
- /* See comment above, this is just switched for the negative */
- error >>= 2;
- if (likely(error >= -interval)) {
- adj = -1;
- interval = -interval;
- offset = -offset;
- } else {
- adj = timekeeping_bigadjust(tk, error, &interval, &offset);
- }
- } else {
- goto out_adjust;
- }
- }
-
- if (unlikely(tk->clock->maxadj &&
- (tk->mult + adj > tk->clock->mult + tk->clock->maxadj))) {
- printk_deferred_once(KERN_WARNING
- "Adjusting %s more than 11%% (%ld vs %ld)\n",
- tk->clock->name, (long)tk->mult + adj,
- (long)tk->clock->mult + tk->clock->maxadj);
- }
- /*
* So the following can be confusing.
*
- * To keep things simple, lets assume adj == 1 for now.
+ * To keep things simple, lets assume mult_adj == 1 for now.
*
- * When adj != 1, remember that the interval and offset values
+ * When mult_adj != 1, remember that the interval and offset values
* have been appropriately scaled so the math is the same.
*
* The basic idea here is that we're increasing the multiplier
@@ -1212,12 +1330,78 @@ static void timekeeping_adjust(struct timekeeper *tk, s64 offset)
*
* XXX - TODO: Doc ntp_error calculation.
*/
- tk->mult += adj;
+ tk->tkr.mult += mult_adj;
tk->xtime_interval += interval;
- tk->xtime_nsec -= offset;
+ tk->tkr.xtime_nsec -= offset;
tk->ntp_error -= (interval - offset) << tk->ntp_error_shift;
+}
+
+/*
+ * Calculate the multiplier adjustment needed to match the frequency
+ * specified by NTP
+ */
+static __always_inline void timekeeping_freqadjust(struct timekeeper *tk,
+ s64 offset)
+{
+ s64 interval = tk->cycle_interval;
+ s64 xinterval = tk->xtime_interval;
+ s64 tick_error;
+ bool negative;
+ u32 adj;
+
+ /* Remove any current error adj from freq calculation */
+ if (tk->ntp_err_mult)
+ xinterval -= tk->cycle_interval;
+
+ tk->ntp_tick = ntp_tick_length();
+
+ /* Calculate current error per tick */
+ tick_error = ntp_tick_length() >> tk->ntp_error_shift;
+ tick_error -= (xinterval + tk->xtime_remainder);
+
+ /* Don't worry about correcting it if its small */
+ if (likely((tick_error >= 0) && (tick_error <= interval)))
+ return;
+
+ /* preserve the direction of correction */
+ negative = (tick_error < 0);
+
+ /* Sort out the magnitude of the correction */
+ tick_error = abs(tick_error);
+ for (adj = 0; tick_error > interval; adj++)
+ tick_error >>= 1;
+
+ /* scale the corrections */
+ timekeeping_apply_adjustment(tk, offset, negative, adj);
+}
+
+/*
+ * Adjust the timekeeper's multiplier to the correct frequency
+ * and also to reduce the accumulated error value.
+ */
+static void timekeeping_adjust(struct timekeeper *tk, s64 offset)
+{
+ /* Correct for the current frequency error */
+ timekeeping_freqadjust(tk, offset);
+
+ /* Next make a small adjustment to fix any cumulative error */
+ if (!tk->ntp_err_mult && (tk->ntp_error > 0)) {
+ tk->ntp_err_mult = 1;
+ timekeeping_apply_adjustment(tk, offset, 0, 0);
+ } else if (tk->ntp_err_mult && (tk->ntp_error <= 0)) {
+ /* Undo any existing error adjustment */
+ timekeeping_apply_adjustment(tk, offset, 1, 0);
+ tk->ntp_err_mult = 0;
+ }
+
+ if (unlikely(tk->tkr.clock->maxadj &&
+ (tk->tkr.mult > tk->tkr.clock->mult + tk->tkr.clock->maxadj))) {
+ printk_once(KERN_WARNING
+ "Adjusting %s more than 11%% (%ld vs %ld)\n",
+ tk->tkr.clock->name, (long)tk->tkr.mult,
+ (long)tk->tkr.clock->mult + tk->tkr.clock->maxadj);
+ }
-out_adjust:
/*
* It may be possible that when we entered this function, xtime_nsec
* was very small. Further, if we're slightly speeding the clocksource
@@ -1232,12 +1416,11 @@ out_adjust:
* We'll correct this error next time through this function, when
* xtime_nsec is not as small.
*/
- if (unlikely((s64)tk->xtime_nsec < 0)) {
- s64 neg = -(s64)tk->xtime_nsec;
- tk->xtime_nsec = 0;
+ if (unlikely((s64)tk->tkr.xtime_nsec < 0)) {
+ s64 neg = -(s64)tk->tkr.xtime_nsec;
+ tk->tkr.xtime_nsec = 0;
tk->ntp_error += neg << tk->ntp_error_shift;
}
-
}
/**
@@ -1250,26 +1433,26 @@ out_adjust:
*/
static inline unsigned int accumulate_nsecs_to_secs(struct timekeeper *tk)
{
- u64 nsecps = (u64)NSEC_PER_SEC << tk->shift;
+ u64 nsecps = (u64)NSEC_PER_SEC << tk->tkr.shift;
unsigned int clock_set = 0;
- while (tk->xtime_nsec >= nsecps) {
+ while (tk->tkr.xtime_nsec >= nsecps) {
int leap;
- tk->xtime_nsec -= nsecps;
+ tk->tkr.xtime_nsec -= nsecps;
tk->xtime_sec++;
/* Figure out if its a leap sec and apply if needed */
leap = second_overflow(tk->xtime_sec);
if (unlikely(leap)) {
- struct timespec ts;
+ struct timespec64 ts;
tk->xtime_sec += leap;
ts.tv_sec = leap;
ts.tv_nsec = 0;
tk_set_wall_to_mono(tk,
- timespec_sub(tk->wall_to_monotonic, ts));
+ timespec64_sub(tk->wall_to_monotonic, ts));
__timekeeping_set_tai_offset(tk, tk->tai_offset - leap);
@@ -1301,9 +1484,9 @@ static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
/* Accumulate one shifted interval */
offset -= interval;
- tk->cycle_last += interval;
+ tk->tkr.cycle_last += interval;
- tk->xtime_nsec += tk->xtime_interval << shift;
+ tk->tkr.xtime_nsec += tk->xtime_interval << shift;
*clock_set |= accumulate_nsecs_to_secs(tk);
/* Accumulate raw time */
@@ -1317,48 +1500,20 @@ static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
tk->raw_time.tv_nsec = raw_nsecs;
/* Accumulate error between NTP and clock interval */
- tk->ntp_error += ntp_tick_length() << shift;
+ tk->ntp_error += tk->ntp_tick << shift;
tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) <<
(tk->ntp_error_shift + shift);
return offset;
}
-#ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD
-static inline void old_vsyscall_fixup(struct timekeeper *tk)
-{
- s64 remainder;
-
- /*
- * Store only full nanoseconds into xtime_nsec after rounding
- * it up and add the remainder to the error difference.
- * XXX - This is necessary to avoid small 1ns inconsistnecies caused
- * by truncating the remainder in vsyscalls. However, it causes
- * additional work to be done in timekeeping_adjust(). Once
- * the vsyscall implementations are converted to use xtime_nsec
- * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD
- * users are removed, this can be killed.
- */
- remainder = tk->xtime_nsec & ((1ULL << tk->shift) - 1);
- tk->xtime_nsec -= remainder;
- tk->xtime_nsec += 1ULL << tk->shift;
- tk->ntp_error += remainder << tk->ntp_error_shift;
- tk->ntp_error -= (1ULL << tk->shift) << tk->ntp_error_shift;
-}
-#else
-#define old_vsyscall_fixup(tk)
-#endif
-
-
-
/**
* update_wall_time - Uses the current clocksource to increment the wall time
*
*/
void update_wall_time(void)
{
- struct clocksource *clock;
- struct timekeeper *real_tk = &timekeeper;
+ struct timekeeper *real_tk = &tk_core.timekeeper;
struct timekeeper *tk = &shadow_timekeeper;
cycle_t offset;
int shift = 0, maxshift;
@@ -1371,12 +1526,11 @@ void update_wall_time(void)
if (unlikely(timekeeping_suspended))
goto out;
- clock = real_tk->clock;
-
#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
offset = real_tk->cycle_interval;
#else
- offset = (clock->read(clock) - clock->cycle_last) & clock->mask;
+ offset = clocksource_delta(tk->tkr.read(tk->tkr.clock),
+ tk->tkr.cycle_last, tk->tkr.mask);
#endif
/* Check if there's really nothing to do */
@@ -1418,9 +1572,7 @@ void update_wall_time(void)
*/
clock_set |= accumulate_nsecs_to_secs(tk);
- write_seqcount_begin(&timekeeper_seq);
- /* Update clock->cycle_last with the new value */
- clock->cycle_last = tk->cycle_last;
+ write_seqcount_begin(&tk_core.seq);
/*
* Update the real timekeeper.
*
@@ -1428,12 +1580,12 @@ void update_wall_time(void)
* requires changes to all other timekeeper usage sites as
* well, i.e. move the timekeeper pointer getter into the
* spinlocked/seqcount protected sections. And we trade this
- * memcpy under the timekeeper_seq against one before we start
+ * memcpy under the tk_core.seq against one before we start
* updating.
*/
memcpy(real_tk, tk, sizeof(*tk));
timekeeping_update(real_tk, clock_set);
- write_seqcount_end(&timekeeper_seq);
+ write_seqcount_end(&tk_core.seq);
out:
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
if (clock_set)
@@ -1454,83 +1606,16 @@ out:
*/
void getboottime(struct timespec *ts)
{
- struct timekeeper *tk = &timekeeper;
- struct timespec boottime = {
- .tv_sec = tk->wall_to_monotonic.tv_sec +
- tk->total_sleep_time.tv_sec,
- .tv_nsec = tk->wall_to_monotonic.tv_nsec +
- tk->total_sleep_time.tv_nsec
- };
-
- set_normalized_timespec(ts, -boottime.tv_sec, -boottime.tv_nsec);
-}
-EXPORT_SYMBOL_GPL(getboottime);
-
-/**
- * get_monotonic_boottime - Returns monotonic time since boot
- * @ts: pointer to the timespec to be set
- *
- * Returns the monotonic time since boot in a timespec.
- *
- * This is similar to CLOCK_MONTONIC/ktime_get_ts, but also
- * includes the time spent in suspend.
- */
-void get_monotonic_boottime(struct timespec *ts)
-{
- struct timekeeper *tk = &timekeeper;
- struct timespec tomono, sleep;
- s64 nsec;
- unsigned int seq;
-
- WARN_ON(timekeeping_suspended);
-
- do {
- seq = read_seqcount_begin(&timekeeper_seq);
- ts->tv_sec = tk->xtime_sec;
- nsec = timekeeping_get_ns(tk);
- tomono = tk->wall_to_monotonic;
- sleep = tk->total_sleep_time;
-
- } while (read_seqcount_retry(&timekeeper_seq, seq));
-
- ts->tv_sec += tomono.tv_sec + sleep.tv_sec;
- ts->tv_nsec = 0;
- timespec_add_ns(ts, nsec + tomono.tv_nsec + sleep.tv_nsec);
-}
-EXPORT_SYMBOL_GPL(get_monotonic_boottime);
-
-/**
- * ktime_get_boottime - Returns monotonic time since boot in a ktime
- *
- * Returns the monotonic time since boot in a ktime
- *
- * This is similar to CLOCK_MONTONIC/ktime_get, but also
- * includes the time spent in suspend.
- */
-ktime_t ktime_get_boottime(void)
-{
- struct timespec ts;
-
- get_monotonic_boottime(&ts);
- return timespec_to_ktime(ts);
-}
-EXPORT_SYMBOL_GPL(ktime_get_boottime);
-
-/**
- * monotonic_to_bootbased - Convert the monotonic time to boot based.
- * @ts: pointer to the timespec to be converted
- */
-void monotonic_to_bootbased(struct timespec *ts)
-{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
+ ktime_t t = ktime_sub(tk->offs_real, tk->offs_boot);
- *ts = timespec_add(*ts, tk->total_sleep_time);
+ *ts = ktime_to_timespec(t);
}
-EXPORT_SYMBOL_GPL(monotonic_to_bootbased);
+EXPORT_SYMBOL_GPL(getboottime);
unsigned long get_seconds(void)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
return tk->xtime_sec;
}
@@ -1538,43 +1623,44 @@ EXPORT_SYMBOL(get_seconds);
struct timespec __current_kernel_time(void)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
- return tk_xtime(tk);
+ return timespec64_to_timespec(tk_xtime(tk));
}
struct timespec current_kernel_time(void)
{
- struct timekeeper *tk = &timekeeper;
- struct timespec now;
+ struct timekeeper *tk = &tk_core.timekeeper;
+ struct timespec64 now;
unsigned long seq;
do {
- seq = read_seqcount_begin(&timekeeper_seq);
+ seq = read_seqcount_begin(&tk_core.seq);
now = tk_xtime(tk);
- } while (read_seqcount_retry(&timekeeper_seq, seq));
+ } while (read_seqcount_retry(&tk_core.seq, seq));
- return now;
+ return timespec64_to_timespec(now);
}
EXPORT_SYMBOL(current_kernel_time);
struct timespec get_monotonic_coarse(void)
{
- struct timekeeper *tk = &timekeeper;
- struct timespec now, mono;
+ struct timekeeper *tk = &tk_core.timekeeper;
+ struct timespec64 now, mono;
unsigned long seq;
do {
- seq = read_seqcount_begin(&timekeeper_seq);
+ seq = read_seqcount_begin(&tk_core.seq);
now = tk_xtime(tk);
mono = tk->wall_to_monotonic;
- } while (read_seqcount_retry(&timekeeper_seq, seq));
+ } while (read_seqcount_retry(&tk_core.seq, seq));
- set_normalized_timespec(&now, now.tv_sec + mono.tv_sec,
+ set_normalized_timespec64(&now, now.tv_sec + mono.tv_sec,
now.tv_nsec + mono.tv_nsec);
- return now;
+
+ return timespec64_to_timespec(now);
}
/*
@@ -1587,29 +1673,38 @@ void do_timer(unsigned long ticks)
}
/**
- * get_xtime_and_monotonic_and_sleep_offset() - get xtime, wall_to_monotonic,
- * and sleep offsets.
- * @xtim: pointer to timespec to be set with xtime
- * @wtom: pointer to timespec to be set with wall_to_monotonic
- * @sleep: pointer to timespec to be set with time in suspend
+ * ktime_get_update_offsets_tick - hrtimer helper
+ * @offs_real: pointer to storage for monotonic -> realtime offset
+ * @offs_boot: pointer to storage for monotonic -> boottime offset
+ * @offs_tai: pointer to storage for monotonic -> clock tai offset
+ *
+ * Returns monotonic time at last tick and various offsets
*/
-void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
- struct timespec *wtom, struct timespec *sleep)
+ktime_t ktime_get_update_offsets_tick(ktime_t *offs_real, ktime_t *offs_boot,
+ ktime_t *offs_tai)
{
- struct timekeeper *tk = &timekeeper;
- unsigned long seq;
+ struct timekeeper *tk = &tk_core.timekeeper;
+ unsigned int seq;
+ ktime_t base;
+ u64 nsecs;
do {
- seq = read_seqcount_begin(&timekeeper_seq);
- *xtim = tk_xtime(tk);
- *wtom = tk->wall_to_monotonic;
- *sleep = tk->total_sleep_time;
- } while (read_seqcount_retry(&timekeeper_seq, seq));
+ seq = read_seqcount_begin(&tk_core.seq);
+
+ base = tk->tkr.base_mono;
+ nsecs = tk->tkr.xtime_nsec >> tk->tkr.shift;
+
+ *offs_real = tk->offs_real;
+ *offs_boot = tk->offs_boot;
+ *offs_tai = tk->offs_tai;
+ } while (read_seqcount_retry(&tk_core.seq, seq));
+
+ return ktime_add_ns(base, nsecs);
}
#ifdef CONFIG_HIGH_RES_TIMERS
/**
- * ktime_get_update_offsets - hrtimer helper
+ * ktime_get_update_offsets_now - hrtimer helper
* @offs_real: pointer to storage for monotonic -> realtime offset
* @offs_boot: pointer to storage for monotonic -> boottime offset
* @offs_tai: pointer to storage for monotonic -> clock tai offset
@@ -1617,57 +1712,37 @@ void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
* Returns current monotonic time and updates the offsets
* Called from hrtimer_interrupt() or retrigger_next_event()
*/
-ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot,
+ktime_t ktime_get_update_offsets_now(ktime_t *offs_real, ktime_t *offs_boot,
ktime_t *offs_tai)
{
- struct timekeeper *tk = &timekeeper;
- ktime_t now;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned int seq;
- u64 secs, nsecs;
+ ktime_t base;
+ u64 nsecs;
do {
- seq = read_seqcount_begin(&timekeeper_seq);
+ seq = read_seqcount_begin(&tk_core.seq);
- secs = tk->xtime_sec;
- nsecs = timekeeping_get_ns(tk);
+ base = tk->tkr.base_mono;
+ nsecs = timekeeping_get_ns(&tk->tkr);
*offs_real = tk->offs_real;
*offs_boot = tk->offs_boot;
*offs_tai = tk->offs_tai;
- } while (read_seqcount_retry(&timekeeper_seq, seq));
+ } while (read_seqcount_retry(&tk_core.seq, seq));
- now = ktime_add_ns(ktime_set(secs, 0), nsecs);
- now = ktime_sub(now, *offs_real);
- return now;
+ return ktime_add_ns(base, nsecs);
}
#endif
/**
- * ktime_get_monotonic_offset() - get wall_to_monotonic in ktime_t format
- */
-ktime_t ktime_get_monotonic_offset(void)
-{
- struct timekeeper *tk = &timekeeper;
- unsigned long seq;
- struct timespec wtom;
-
- do {
- seq = read_seqcount_begin(&timekeeper_seq);
- wtom = tk->wall_to_monotonic;
- } while (read_seqcount_retry(&timekeeper_seq, seq));
-
- return timespec_to_ktime(wtom);
-}
-EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset);
-
-/**
* do_adjtimex() - Accessor function to NTP __do_adjtimex function
*/
int do_adjtimex(struct timex *txc)
{
- struct timekeeper *tk = &timekeeper;
+ struct timekeeper *tk = &tk_core.timekeeper;
unsigned long flags;
- struct timespec ts;
+ struct timespec64 ts;
s32 orig_tai, tai;
int ret;
@@ -1687,10 +1762,10 @@ int do_adjtimex(struct timex *txc)
return ret;
}
- getnstimeofday(&ts);
+ getnstimeofday64(&ts);
raw_spin_lock_irqsave(&timekeeper_lock, flags);
- write_seqcount_begin(&timekeeper_seq);
+ write_seqcount_begin(&tk_core.seq);
orig_tai = tai = tk->tai_offset;
ret = __do_adjtimex(txc, &ts, &tai);
@@ -1699,7 +1774,7 @@ int do_adjtimex(struct timex *txc)
__timekeeping_set_tai_offset(tk, tai);
timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET);
}
- write_seqcount_end(&timekeeper_seq);
+ write_seqcount_end(&tk_core.seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
if (tai != orig_tai)
@@ -1719,11 +1794,11 @@ void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
unsigned long flags;
raw_spin_lock_irqsave(&timekeeper_lock, flags);
- write_seqcount_begin(&timekeeper_seq);
+ write_seqcount_begin(&tk_core.seq);
__hardpps(phase_ts, raw_ts);
- write_seqcount_end(&timekeeper_seq);
+ write_seqcount_end(&tk_core.seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
}
EXPORT_SYMBOL(hardpps);
diff --git a/kernel/time/timekeeping.h b/kernel/time/timekeeping.h
new file mode 100644
index 000000000000..adc1fc98bde3
--- /dev/null
+++ b/kernel/time/timekeeping.h
@@ -0,0 +1,20 @@
+#ifndef _KERNEL_TIME_TIMEKEEPING_H
+#define _KERNEL_TIME_TIMEKEEPING_H
+/*
+ * Internal interfaces for kernel/time/
+ */
+extern ktime_t ktime_get_update_offsets_tick(ktime_t *offs_real,
+ ktime_t *offs_boot,
+ ktime_t *offs_tai);
+extern ktime_t ktime_get_update_offsets_now(ktime_t *offs_real,
+ ktime_t *offs_boot,
+ ktime_t *offs_tai);
+
+extern int timekeeping_valid_for_hres(void);
+extern u64 timekeeping_max_deferment(void);
+extern int timekeeping_inject_offset(struct timespec *ts);
+extern s32 timekeeping_get_tai_offset(void);
+extern void timekeeping_set_tai_offset(s32 tai_offset);
+extern void timekeeping_clocktai(struct timespec *ts);
+
+#endif
diff --git a/kernel/time/timekeeping_debug.c b/kernel/time/timekeeping_debug.c
index 4d54f97558df..f6bd65236712 100644
--- a/kernel/time/timekeeping_debug.c
+++ b/kernel/time/timekeeping_debug.c
@@ -67,7 +67,7 @@ static int __init tk_debug_sleep_time_init(void)
}
late_initcall(tk_debug_sleep_time_init);
-void tk_debug_account_sleep_time(struct timespec *t)
+void tk_debug_account_sleep_time(struct timespec64 *t)
{
sleep_time_bin[fls(t->tv_sec)]++;
}
diff --git a/kernel/time/timekeeping_internal.h b/kernel/time/timekeeping_internal.h
index 13323ea08ffa..4ea005a7f9da 100644
--- a/kernel/time/timekeeping_internal.h
+++ b/kernel/time/timekeeping_internal.h
@@ -3,12 +3,27 @@
/*
* timekeeping debug functions
*/
+#include <linux/clocksource.h>
#include <linux/time.h>
#ifdef CONFIG_DEBUG_FS
-extern void tk_debug_account_sleep_time(struct timespec *t);
+extern void tk_debug_account_sleep_time(struct timespec64 *t);
#else
#define tk_debug_account_sleep_time(x)
#endif
+#ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE
+static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
+{
+ cycle_t ret = (now - last) & mask;
+
+ return (s64) ret > 0 ? ret : 0;
+}
+#else
+static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
+{
+ return (now - last) & mask;
+}
+#endif
+
#endif /* _TIMEKEEPING_INTERNAL_H */
diff --git a/kernel/timer.c b/kernel/time/timer.c
index 3bb01a323b2a..aca5dfe2fa3d 100644
--- a/kernel/timer.c
+++ b/kernel/time/timer.c
@@ -82,6 +82,7 @@ struct tvec_base {
unsigned long next_timer;
unsigned long active_timers;
unsigned long all_timers;
+ int cpu;
struct tvec_root tv1;
struct tvec tv2;
struct tvec tv3;
@@ -409,6 +410,22 @@ static void internal_add_timer(struct tvec_base *base, struct timer_list *timer)
base->next_timer = timer->expires;
}
base->all_timers++;
+
+ /*
+ * Check whether the other CPU is in dynticks mode and needs
+ * to be triggered to reevaluate the timer wheel.
+ * We are protected against the other CPU fiddling
+ * with the timer by holding the timer base lock. This also
+ * makes sure that a CPU on the way to stop its tick can not
+ * evaluate the timer wheel.
+ *
+ * Spare the IPI for deferrable timers on idle targets though.
+ * The next busy ticks will take care of it. Except full dynticks
+ * require special care against races with idle_cpu(), lets deal
+ * with that later.
+ */
+ if (!tbase_get_deferrable(base) || tick_nohz_full_cpu(base->cpu))
+ wake_up_nohz_cpu(base->cpu);
}
#ifdef CONFIG_TIMER_STATS
@@ -948,22 +965,6 @@ void add_timer_on(struct timer_list *timer, int cpu)
timer_set_base(timer, base);
debug_activate(timer, timer->expires);
internal_add_timer(base, timer);
- /*
- * Check whether the other CPU is in dynticks mode and needs
- * to be triggered to reevaluate the timer wheel.
- * We are protected against the other CPU fiddling
- * with the timer by holding the timer base lock. This also
- * makes sure that a CPU on the way to stop its tick can not
- * evaluate the timer wheel.
- *
- * Spare the IPI for deferrable timers on idle targets though.
- * The next busy ticks will take care of it. Except full dynticks
- * require special care against races with idle_cpu(), lets deal
- * with that later.
- */
- if (!tbase_get_deferrable(timer->base) || tick_nohz_full_cpu(cpu))
- wake_up_nohz_cpu(cpu);
-
spin_unlock_irqrestore(&base->lock, flags);
}
EXPORT_SYMBOL_GPL(add_timer_on);
@@ -1568,6 +1569,7 @@ static int init_timers_cpu(int cpu)
}
spin_lock_init(&base->lock);
tvec_base_done[cpu] = 1;
+ base->cpu = cpu;
} else {
base = per_cpu(tvec_bases, cpu);
}
diff --git a/kernel/time/udelay_test.c b/kernel/time/udelay_test.c
new file mode 100644
index 000000000000..e622ba365a13
--- /dev/null
+++ b/kernel/time/udelay_test.c
@@ -0,0 +1,168 @@
+/*
+ * udelay() test kernel module
+ *
+ * Test is executed by writing and reading to /sys/kernel/debug/udelay_test
+ * Tests are configured by writing: USECS ITERATIONS
+ * Tests are executed by reading from the same file.
+ * Specifying usecs of 0 or negative values will run multiples tests.
+ *
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/ktime.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+
+#define DEFAULT_ITERATIONS 100
+
+#define DEBUGFS_FILENAME "udelay_test"
+
+static DEFINE_MUTEX(udelay_test_lock);
+static struct dentry *udelay_test_debugfs_file;
+static int udelay_test_usecs;
+static int udelay_test_iterations = DEFAULT_ITERATIONS;
+
+static int udelay_test_single(struct seq_file *s, int usecs, uint32_t iters)
+{
+ int min = 0, max = 0, fail_count = 0;
+ uint64_t sum = 0;
+ uint64_t avg;
+ int i;
+ /* Allow udelay to be up to 0.5% fast */
+ int allowed_error_ns = usecs * 5;
+
+ for (i = 0; i < iters; ++i) {
+ struct timespec ts1, ts2;
+ int time_passed;
+
+ ktime_get_ts(&ts1);
+ udelay(usecs);
+ ktime_get_ts(&ts2);
+ time_passed = timespec_to_ns(&ts2) - timespec_to_ns(&ts1);
+
+ if (i == 0 || time_passed < min)
+ min = time_passed;
+ if (i == 0 || time_passed > max)
+ max = time_passed;
+ if ((time_passed + allowed_error_ns) / 1000 < usecs)
+ ++fail_count;
+ WARN_ON(time_passed < 0);
+ sum += time_passed;
+ }
+
+ avg = sum;
+ do_div(avg, iters);
+ seq_printf(s, "%d usecs x %d: exp=%d allowed=%d min=%d avg=%lld max=%d",
+ usecs, iters, usecs * 1000,
+ (usecs * 1000) - allowed_error_ns, min, avg, max);
+ if (fail_count)
+ seq_printf(s, " FAIL=%d", fail_count);
+ seq_puts(s, "\n");
+
+ return 0;
+}
+
+static int udelay_test_show(struct seq_file *s, void *v)
+{
+ int usecs;
+ int iters;
+ int ret = 0;
+
+ mutex_lock(&udelay_test_lock);
+ usecs = udelay_test_usecs;
+ iters = udelay_test_iterations;
+ mutex_unlock(&udelay_test_lock);
+
+ if (usecs > 0 && iters > 0) {
+ return udelay_test_single(s, usecs, iters);
+ } else if (usecs == 0) {
+ struct timespec ts;
+
+ ktime_get_ts(&ts);
+ seq_printf(s, "udelay() test (lpj=%ld kt=%ld.%09ld)\n",
+ loops_per_jiffy, ts.tv_sec, ts.tv_nsec);
+ seq_puts(s, "usage:\n");
+ seq_puts(s, "echo USECS [ITERS] > " DEBUGFS_FILENAME "\n");
+ seq_puts(s, "cat " DEBUGFS_FILENAME "\n");
+ }
+
+ return ret;
+}
+
+static int udelay_test_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, udelay_test_show, inode->i_private);
+}
+
+static ssize_t udelay_test_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *pos)
+{
+ char lbuf[32];
+ int ret;
+ int usecs;
+ int iters;
+
+ if (count >= sizeof(lbuf))
+ return -EINVAL;
+
+ if (copy_from_user(lbuf, buf, count))
+ return -EFAULT;
+ lbuf[count] = '\0';
+
+ ret = sscanf(lbuf, "%d %d", &usecs, &iters);
+ if (ret < 1)
+ return -EINVAL;
+ else if (ret < 2)
+ iters = DEFAULT_ITERATIONS;
+
+ mutex_lock(&udelay_test_lock);
+ udelay_test_usecs = usecs;
+ udelay_test_iterations = iters;
+ mutex_unlock(&udelay_test_lock);
+
+ return count;
+}
+
+static const struct file_operations udelay_test_debugfs_ops = {
+ .owner = THIS_MODULE,
+ .open = udelay_test_open,
+ .read = seq_read,
+ .write = udelay_test_write,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init udelay_test_init(void)
+{
+ mutex_lock(&udelay_test_lock);
+ udelay_test_debugfs_file = debugfs_create_file(DEBUGFS_FILENAME,
+ S_IRUSR, NULL, NULL, &udelay_test_debugfs_ops);
+ mutex_unlock(&udelay_test_lock);
+
+ return 0;
+}
+
+module_init(udelay_test_init);
+
+static void __exit udelay_test_exit(void)
+{
+ mutex_lock(&udelay_test_lock);
+ debugfs_remove(udelay_test_debugfs_file);
+ mutex_unlock(&udelay_test_lock);
+}
+
+module_exit(udelay_test_exit);
+
+MODULE_AUTHOR("David Riley <davidriley@chromium.org>");
+MODULE_LICENSE("GPL");
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8bb80fe08767..8a528392b1f4 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -820,11 +820,12 @@ static struct {
const char *name;
int in_ns; /* is this clock in nanoseconds? */
} trace_clocks[] = {
- { trace_clock_local, "local", 1 },
- { trace_clock_global, "global", 1 },
- { trace_clock_counter, "counter", 0 },
- { trace_clock_jiffies, "uptime", 0 },
- { trace_clock, "perf", 1 },
+ { trace_clock_local, "local", 1 },
+ { trace_clock_global, "global", 1 },
+ { trace_clock_counter, "counter", 0 },
+ { trace_clock_jiffies, "uptime", 0 },
+ { trace_clock, "perf", 1 },
+ { ktime_get_mono_fast_ns, "mono", 1 },
ARCH_TRACE_CLOCKS
};
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index a1dd9a1b1327..975cb49e32bf 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -31,20 +31,19 @@ void bacct_add_tsk(struct user_namespace *user_ns,
struct taskstats *stats, struct task_struct *tsk)
{
const struct cred *tcred;
- struct timespec uptime, ts;
cputime_t utime, stime, utimescaled, stimescaled;
- u64 ac_etime;
+ u64 delta;
BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
- /* calculate task elapsed time in timespec */
- do_posix_clock_monotonic_gettime(&uptime);
- ts = timespec_sub(uptime, tsk->start_time);
- /* rebase elapsed time to usec (should never be negative) */
- ac_etime = timespec_to_ns(&ts);
- do_div(ac_etime, NSEC_PER_USEC);
- stats->ac_etime = ac_etime;
- stats->ac_btime = get_seconds() - ts.tv_sec;
+ /* calculate task elapsed time in nsec */
+ delta = ktime_get_ns() - tsk->start_time;
+ /* Convert to micro seconds */
+ do_div(delta, NSEC_PER_USEC);
+ stats->ac_etime = delta;
+ /* Convert to seconds for btime */
+ do_div(delta, USEC_PER_SEC);
+ stats->ac_btime = get_seconds() - delta;
if (thread_group_leader(tsk)) {
stats->ac_exitcode = tsk->exit_code;
if (tsk->flags & PF_FORKNOEXEC)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-17 00:23:30 +0000