2 * Time of day based timer functions.
5 * Copyright IBM Corp. 1999, 2008
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com),
8 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
10 * Derived from "arch/i386/kernel/time.c"
11 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
14 #define KMSG_COMPONENT "time"
15 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17 #include <linux/kernel_stat.h>
18 #include <linux/errno.h>
19 #include <linux/module.h>
20 #include <linux/sched.h>
21 #include <linux/kernel.h>
22 #include <linux/param.h>
23 #include <linux/string.h>
25 #include <linux/interrupt.h>
26 #include <linux/cpu.h>
27 #include <linux/stop_machine.h>
28 #include <linux/time.h>
29 #include <linux/device.h>
30 #include <linux/delay.h>
31 #include <linux/init.h>
32 #include <linux/smp.h>
33 #include <linux/types.h>
34 #include <linux/profile.h>
35 #include <linux/timex.h>
36 #include <linux/notifier.h>
37 #include <linux/timekeeper_internal.h>
38 #include <linux/clockchips.h>
39 #include <linux/gfp.h>
40 #include <linux/kprobes.h>
41 #include <asm/uaccess.h>
42 #include <asm/facility.h>
43 #include <asm/delay.h>
44 #include <asm/div64.h>
47 #include <asm/irq_regs.h>
48 #include <asm/vtimer.h>
53 /* change this if you have some constant time drift */
54 #define USECS_PER_JIFFY ((unsigned long) 1000000/HZ)
55 #define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12)
57 u64 sched_clock_base_cc
= -1; /* Force to data section. */
58 EXPORT_SYMBOL_GPL(sched_clock_base_cc
);
60 static DEFINE_PER_CPU(struct clock_event_device
, comparators
);
62 ATOMIC_NOTIFIER_HEAD(s390_epoch_delta_notifier
);
63 EXPORT_SYMBOL(s390_epoch_delta_notifier
);
65 unsigned char ptff_function_mask
[16];
66 unsigned long lpar_offset
;
67 unsigned long initial_leap_seconds
;
70 * Get time offsets with PTFF
72 void __init
ptff_init(void)
77 if (!test_facility(28))
79 ptff(&ptff_function_mask
, sizeof(ptff_function_mask
), PTFF_QAF
);
82 if (ptff_query(PTFF_QTO
) && ptff(&qto
, sizeof(qto
), PTFF_QTO
) == 0)
83 lpar_offset
= qto
.tod_epoch_difference
;
85 /* get initial leap seconds */
86 if (ptff_query(PTFF_QUI
) && ptff(&qui
, sizeof(qui
), PTFF_QUI
) == 0)
87 initial_leap_seconds
= (unsigned long)
88 ((long) qui
.old_leap
* 4096000000L);
92 * Scheduler clock - returns current time in nanosec units.
94 unsigned long long notrace
sched_clock(void)
96 return tod_to_ns(get_tod_clock_monotonic());
98 NOKPROBE_SYMBOL(sched_clock
);
101 * Monotonic_clock - returns # of nanoseconds passed since time_init()
103 unsigned long long monotonic_clock(void)
105 return sched_clock();
107 EXPORT_SYMBOL(monotonic_clock
);
109 void tod_to_timeval(__u64 todval
, struct timespec64
*xt
)
111 unsigned long long sec
;
114 do_div(sec
, 1000000);
116 todval
-= (sec
* 1000000) << 12;
117 xt
->tv_nsec
= ((todval
* 1000) >> 12);
119 EXPORT_SYMBOL(tod_to_timeval
);
121 void clock_comparator_work(void)
123 struct clock_event_device
*cd
;
125 S390_lowcore
.clock_comparator
= -1ULL;
126 cd
= this_cpu_ptr(&comparators
);
127 cd
->event_handler(cd
);
131 * Fixup the clock comparator.
133 static void fixup_clock_comparator(unsigned long long delta
)
135 /* If nobody is waiting there's nothing to fix. */
136 if (S390_lowcore
.clock_comparator
== -1ULL)
138 S390_lowcore
.clock_comparator
+= delta
;
139 set_clock_comparator(S390_lowcore
.clock_comparator
);
142 static int s390_next_event(unsigned long delta
,
143 struct clock_event_device
*evt
)
145 S390_lowcore
.clock_comparator
= get_tod_clock() + delta
;
146 set_clock_comparator(S390_lowcore
.clock_comparator
);
151 * Set up lowcore and control register of the current cpu to
152 * enable TOD clock and clock comparator interrupts.
154 void init_cpu_timer(void)
156 struct clock_event_device
*cd
;
159 S390_lowcore
.clock_comparator
= -1ULL;
160 set_clock_comparator(S390_lowcore
.clock_comparator
);
162 cpu
= smp_processor_id();
163 cd
= &per_cpu(comparators
, cpu
);
164 cd
->name
= "comparator";
165 cd
->features
= CLOCK_EVT_FEAT_ONESHOT
;
168 cd
->min_delta_ns
= 1;
169 cd
->max_delta_ns
= LONG_MAX
;
171 cd
->cpumask
= cpumask_of(cpu
);
172 cd
->set_next_event
= s390_next_event
;
174 clockevents_register_device(cd
);
176 /* Enable clock comparator timer interrupt. */
179 /* Always allow the timing alert external interrupt. */
183 static void clock_comparator_interrupt(struct ext_code ext_code
,
184 unsigned int param32
,
185 unsigned long param64
)
187 inc_irq_stat(IRQEXT_CLK
);
188 if (S390_lowcore
.clock_comparator
== -1ULL)
189 set_clock_comparator(S390_lowcore
.clock_comparator
);
192 static void stp_timing_alert(struct stp_irq_parm
*);
194 static void timing_alert_interrupt(struct ext_code ext_code
,
195 unsigned int param32
, unsigned long param64
)
197 inc_irq_stat(IRQEXT_TLA
);
198 if (param32
& 0x00038000)
199 stp_timing_alert((struct stp_irq_parm
*) ¶m32
);
202 static void stp_reset(void);
204 void read_persistent_clock64(struct timespec64
*ts
)
208 clock
= get_tod_clock() - initial_leap_seconds
;
209 tod_to_timeval(clock
- TOD_UNIX_EPOCH
, ts
);
212 void read_boot_clock64(struct timespec64
*ts
)
216 clock
= sched_clock_base_cc
- initial_leap_seconds
;
217 tod_to_timeval(clock
- TOD_UNIX_EPOCH
, ts
);
220 static cycle_t
read_tod_clock(struct clocksource
*cs
)
222 return get_tod_clock();
225 static struct clocksource clocksource_tod
= {
228 .read
= read_tod_clock
,
232 .flags
= CLOCK_SOURCE_IS_CONTINUOUS
,
235 struct clocksource
* __init
clocksource_default_clock(void)
237 return &clocksource_tod
;
240 void update_vsyscall(struct timekeeper
*tk
)
244 if (tk
->tkr_mono
.clock
!= &clocksource_tod
)
247 /* Make userspace gettimeofday spin until we're done. */
248 ++vdso_data
->tb_update_count
;
250 vdso_data
->xtime_tod_stamp
= tk
->tkr_mono
.cycle_last
;
251 vdso_data
->xtime_clock_sec
= tk
->xtime_sec
;
252 vdso_data
->xtime_clock_nsec
= tk
->tkr_mono
.xtime_nsec
;
253 vdso_data
->wtom_clock_sec
=
254 tk
->xtime_sec
+ tk
->wall_to_monotonic
.tv_sec
;
255 vdso_data
->wtom_clock_nsec
= tk
->tkr_mono
.xtime_nsec
+
256 + ((u64
) tk
->wall_to_monotonic
.tv_nsec
<< tk
->tkr_mono
.shift
);
257 nsecps
= (u64
) NSEC_PER_SEC
<< tk
->tkr_mono
.shift
;
258 while (vdso_data
->wtom_clock_nsec
>= nsecps
) {
259 vdso_data
->wtom_clock_nsec
-= nsecps
;
260 vdso_data
->wtom_clock_sec
++;
263 vdso_data
->xtime_coarse_sec
= tk
->xtime_sec
;
264 vdso_data
->xtime_coarse_nsec
=
265 (long)(tk
->tkr_mono
.xtime_nsec
>> tk
->tkr_mono
.shift
);
266 vdso_data
->wtom_coarse_sec
=
267 vdso_data
->xtime_coarse_sec
+ tk
->wall_to_monotonic
.tv_sec
;
268 vdso_data
->wtom_coarse_nsec
=
269 vdso_data
->xtime_coarse_nsec
+ tk
->wall_to_monotonic
.tv_nsec
;
270 while (vdso_data
->wtom_coarse_nsec
>= NSEC_PER_SEC
) {
271 vdso_data
->wtom_coarse_nsec
-= NSEC_PER_SEC
;
272 vdso_data
->wtom_coarse_sec
++;
275 vdso_data
->tk_mult
= tk
->tkr_mono
.mult
;
276 vdso_data
->tk_shift
= tk
->tkr_mono
.shift
;
278 ++vdso_data
->tb_update_count
;
281 extern struct timezone sys_tz
;
283 void update_vsyscall_tz(void)
285 /* Make userspace gettimeofday spin until we're done. */
286 ++vdso_data
->tb_update_count
;
288 vdso_data
->tz_minuteswest
= sys_tz
.tz_minuteswest
;
289 vdso_data
->tz_dsttime
= sys_tz
.tz_dsttime
;
291 ++vdso_data
->tb_update_count
;
295 * Initialize the TOD clock and the CPU timer of
298 void __init
time_init(void)
300 /* Reset time synchronization interfaces. */
303 /* request the clock comparator external interrupt */
304 if (register_external_irq(EXT_IRQ_CLK_COMP
, clock_comparator_interrupt
))
305 panic("Couldn't request external interrupt 0x1004");
307 /* request the timing alert external interrupt */
308 if (register_external_irq(EXT_IRQ_TIMING_ALERT
, timing_alert_interrupt
))
309 panic("Couldn't request external interrupt 0x1406");
311 if (__clocksource_register(&clocksource_tod
) != 0)
312 panic("Could not register TOD clock source");
314 /* Enable TOD clock interrupts on the boot cpu. */
317 /* Enable cpu timer interrupts on the boot cpu. */
322 * The time is "clock". old is what we think the time is.
323 * Adjust the value by a multiple of jiffies and add the delta to ntp.
324 * "delay" is an approximation how long the synchronization took. If
325 * the time correction is positive, then "delay" is subtracted from
326 * the time difference and only the remaining part is passed to ntp.
328 static unsigned long long adjust_time(unsigned long long old
,
329 unsigned long long clock
,
330 unsigned long long delay
)
332 unsigned long long delta
, ticks
;
336 /* It is later than we thought. */
337 delta
= ticks
= clock
- old
;
338 delta
= ticks
= (delta
< delay
) ? 0 : delta
- delay
;
339 delta
-= do_div(ticks
, CLK_TICKS_PER_JIFFY
);
340 adjust
.offset
= ticks
* (1000000 / HZ
);
342 /* It is earlier than we thought. */
343 delta
= ticks
= old
- clock
;
344 delta
-= do_div(ticks
, CLK_TICKS_PER_JIFFY
);
346 adjust
.offset
= -ticks
* (1000000 / HZ
);
348 sched_clock_base_cc
+= delta
;
349 if (adjust
.offset
!= 0) {
350 pr_notice("The ETR interface has adjusted the clock "
351 "by %li microseconds\n", adjust
.offset
);
352 adjust
.modes
= ADJ_OFFSET_SINGLESHOT
;
353 do_adjtimex(&adjust
);
358 static DEFINE_PER_CPU(atomic_t
, clock_sync_word
);
359 static DEFINE_MUTEX(clock_sync_mutex
);
360 static unsigned long clock_sync_flags
;
362 #define CLOCK_SYNC_HAS_ETR 0
363 #define CLOCK_SYNC_HAS_STP 1
364 #define CLOCK_SYNC_ETR 2
365 #define CLOCK_SYNC_STP 3
368 * The get_clock function for the physical clock. It will get the current
369 * TOD clock, subtract the LPAR offset and write the result to *clock.
370 * The function returns 0 if the clock is in sync with the external time
371 * source. If the clock mode is local it will return -EOPNOTSUPP and
372 * -EAGAIN if the clock is not in sync with the external reference.
374 int get_phys_clock(unsigned long long *clock
)
377 unsigned int sw0
, sw1
;
379 sw_ptr
= &get_cpu_var(clock_sync_word
);
380 sw0
= atomic_read(sw_ptr
);
381 *clock
= get_tod_clock() - lpar_offset
;
382 sw1
= atomic_read(sw_ptr
);
383 put_cpu_var(clock_sync_word
);
384 if (sw0
== sw1
&& (sw0
& 0x80000000U
))
385 /* Success: time is in sync. */
387 if (!test_bit(CLOCK_SYNC_HAS_ETR
, &clock_sync_flags
) &&
388 !test_bit(CLOCK_SYNC_HAS_STP
, &clock_sync_flags
))
390 if (!test_bit(CLOCK_SYNC_ETR
, &clock_sync_flags
) &&
391 !test_bit(CLOCK_SYNC_STP
, &clock_sync_flags
))
395 EXPORT_SYMBOL(get_phys_clock
);
398 * Make get_sync_clock return -EAGAIN.
400 static void disable_sync_clock(void *dummy
)
402 atomic_t
*sw_ptr
= this_cpu_ptr(&clock_sync_word
);
404 * Clear the in-sync bit 2^31. All get_sync_clock calls will
405 * fail until the sync bit is turned back on. In addition
406 * increase the "sequence" counter to avoid the race of an
407 * etr event and the complete recovery against get_sync_clock.
409 atomic_andnot(0x80000000, sw_ptr
);
414 * Make get_sync_clock return 0 again.
415 * Needs to be called from a context disabled for preemption.
417 static void enable_sync_clock(void)
419 atomic_t
*sw_ptr
= this_cpu_ptr(&clock_sync_word
);
420 atomic_or(0x80000000, sw_ptr
);
424 * Function to check if the clock is in sync.
426 static inline int check_sync_clock(void)
431 sw_ptr
= &get_cpu_var(clock_sync_word
);
432 rc
= (atomic_read(sw_ptr
) & 0x80000000U
) != 0;
433 put_cpu_var(clock_sync_word
);
437 /* Single threaded workqueue used for etr and stp sync events */
438 static struct workqueue_struct
*time_sync_wq
;
440 static void __init
time_init_wq(void)
444 time_sync_wq
= create_singlethread_workqueue("timesync");
447 struct clock_sync_data
{
450 unsigned long long fixup_cc
;
452 struct etr_aib
*etr_aib
;
455 static void clock_sync_cpu(struct clock_sync_data
*sync
)
457 atomic_dec(&sync
->cpus
);
460 * This looks like a busy wait loop but it isn't. etr_sync_cpus
461 * is called on all other cpus while the TOD clocks is stopped.
462 * __udelay will stop the cpu on an enabled wait psw until the
463 * TOD is running again.
465 while (sync
->in_sync
== 0) {
468 * A different cpu changes *in_sync. Therefore use
469 * barrier() to force memory access.
473 if (sync
->in_sync
!= 1)
474 /* Didn't work. Clear per-cpu in sync bit again. */
475 disable_sync_clock(NULL
);
477 * This round of TOD syncing is done. Set the clock comparator
478 * to the next tick and let the processor continue.
480 fixup_clock_comparator(sync
->fixup_cc
);
484 * Server Time Protocol (STP) code.
486 static bool stp_online
;
487 static struct stp_sstpi stp_info
;
488 static void *stp_page
;
490 static void stp_work_fn(struct work_struct
*work
);
491 static DEFINE_MUTEX(stp_work_mutex
);
492 static DECLARE_WORK(stp_work
, stp_work_fn
);
493 static struct timer_list stp_timer
;
495 static int __init
early_parse_stp(char *p
)
497 return kstrtobool(p
, &stp_online
);
499 early_param("stp", early_parse_stp
);
502 * Reset STP attachment.
504 static void __init
stp_reset(void)
508 stp_page
= (void *) get_zeroed_page(GFP_ATOMIC
);
509 rc
= chsc_sstpc(stp_page
, STP_OP_CTRL
, 0x0000, NULL
);
511 set_bit(CLOCK_SYNC_HAS_STP
, &clock_sync_flags
);
512 else if (stp_online
) {
513 pr_warn("The real or virtual hardware system does not provide an STP interface\n");
514 free_page((unsigned long) stp_page
);
520 static void stp_timeout(unsigned long dummy
)
522 queue_work(time_sync_wq
, &stp_work
);
525 static int __init
stp_init(void)
527 if (!test_bit(CLOCK_SYNC_HAS_STP
, &clock_sync_flags
))
529 setup_timer(&stp_timer
, stp_timeout
, 0UL);
533 queue_work(time_sync_wq
, &stp_work
);
537 arch_initcall(stp_init
);
540 * STP timing alert. There are three causes:
541 * 1) timing status change
542 * 2) link availability change
543 * 3) time control parameter change
544 * In all three cases we are only interested in the clock source state.
545 * If a STP clock source is now available use it.
547 static void stp_timing_alert(struct stp_irq_parm
*intparm
)
549 if (intparm
->tsc
|| intparm
->lac
|| intparm
->tcpc
)
550 queue_work(time_sync_wq
, &stp_work
);
554 * STP sync check machine check. This is called when the timing state
555 * changes from the synchronized state to the unsynchronized state.
556 * After a STP sync check the clock is not in sync. The machine check
557 * is broadcasted to all cpus at the same time.
559 int stp_sync_check(void)
561 disable_sync_clock(NULL
);
566 * STP island condition machine check. This is called when an attached
567 * server attempts to communicate over an STP link and the servers
568 * have matching CTN ids and have a valid stratum-1 configuration
569 * but the configurations do not match.
571 int stp_island_check(void)
573 disable_sync_clock(NULL
);
577 void stp_queue_work(void)
579 queue_work(time_sync_wq
, &stp_work
);
582 static int stp_sync_clock(void *data
)
585 unsigned long long old_clock
, delta
, new_clock
, clock_delta
;
586 struct clock_sync_data
*stp_sync
;
592 if (xchg(&first
, 1) == 1) {
594 clock_sync_cpu(stp_sync
);
598 /* Wait until all other cpus entered the sync function. */
599 while (atomic_read(&stp_sync
->cpus
) != 0)
605 if (stp_info
.todoff
[0] || stp_info
.todoff
[1] ||
606 stp_info
.todoff
[2] || stp_info
.todoff
[3] ||
608 old_clock
= get_tod_clock();
609 rc
= chsc_sstpc(stp_page
, STP_OP_SYNC
, 0, &clock_delta
);
611 new_clock
= old_clock
+ clock_delta
;
612 delta
= adjust_time(old_clock
, new_clock
, 0);
613 if (ptff_query(PTFF_QTO
) &&
614 ptff(&qto
, sizeof(qto
), PTFF_QTO
) == 0)
615 /* Update LPAR offset */
616 lpar_offset
= qto
.tod_epoch_difference
;
617 atomic_notifier_call_chain(&s390_epoch_delta_notifier
,
619 fixup_clock_comparator(delta
);
620 rc
= chsc_sstpi(stp_page
, &stp_info
,
621 sizeof(struct stp_sstpi
));
622 if (rc
== 0 && stp_info
.tmd
!= 2)
627 disable_sync_clock(NULL
);
628 stp_sync
->in_sync
= -EAGAIN
;
630 stp_sync
->in_sync
= 1;
636 * STP work. Check for the STP state and take over the clock
637 * synchronization if the STP clock source is usable.
639 static void stp_work_fn(struct work_struct
*work
)
641 struct clock_sync_data stp_sync
;
644 /* prevent multiple execution. */
645 mutex_lock(&stp_work_mutex
);
648 chsc_sstpc(stp_page
, STP_OP_CTRL
, 0x0000, NULL
);
649 del_timer_sync(&stp_timer
);
653 rc
= chsc_sstpc(stp_page
, STP_OP_CTRL
, 0xb0e0, NULL
);
657 rc
= chsc_sstpi(stp_page
, &stp_info
, sizeof(struct stp_sstpi
));
658 if (rc
|| stp_info
.c
== 0)
661 /* Skip synchronization if the clock is already in sync. */
662 if (check_sync_clock())
665 memset(&stp_sync
, 0, sizeof(stp_sync
));
667 atomic_set(&stp_sync
.cpus
, num_online_cpus() - 1);
668 stop_machine(stp_sync_clock
, &stp_sync
, cpu_online_mask
);
671 if (!check_sync_clock())
673 * There is a usable clock but the synchonization failed.
674 * Retry after a second.
676 mod_timer(&stp_timer
, jiffies
+ HZ
);
679 mutex_unlock(&stp_work_mutex
);
683 * STP subsys sysfs interface functions
685 static struct bus_type stp_subsys
= {
690 static ssize_t
stp_ctn_id_show(struct device
*dev
,
691 struct device_attribute
*attr
,
696 return sprintf(buf
, "%016llx\n",
697 *(unsigned long long *) stp_info
.ctnid
);
700 static DEVICE_ATTR(ctn_id
, 0400, stp_ctn_id_show
, NULL
);
702 static ssize_t
stp_ctn_type_show(struct device
*dev
,
703 struct device_attribute
*attr
,
708 return sprintf(buf
, "%i\n", stp_info
.ctn
);
711 static DEVICE_ATTR(ctn_type
, 0400, stp_ctn_type_show
, NULL
);
713 static ssize_t
stp_dst_offset_show(struct device
*dev
,
714 struct device_attribute
*attr
,
717 if (!stp_online
|| !(stp_info
.vbits
& 0x2000))
719 return sprintf(buf
, "%i\n", (int)(s16
) stp_info
.dsto
);
722 static DEVICE_ATTR(dst_offset
, 0400, stp_dst_offset_show
, NULL
);
724 static ssize_t
stp_leap_seconds_show(struct device
*dev
,
725 struct device_attribute
*attr
,
728 if (!stp_online
|| !(stp_info
.vbits
& 0x8000))
730 return sprintf(buf
, "%i\n", (int)(s16
) stp_info
.leaps
);
733 static DEVICE_ATTR(leap_seconds
, 0400, stp_leap_seconds_show
, NULL
);
735 static ssize_t
stp_stratum_show(struct device
*dev
,
736 struct device_attribute
*attr
,
741 return sprintf(buf
, "%i\n", (int)(s16
) stp_info
.stratum
);
744 static DEVICE_ATTR(stratum
, 0400, stp_stratum_show
, NULL
);
746 static ssize_t
stp_time_offset_show(struct device
*dev
,
747 struct device_attribute
*attr
,
750 if (!stp_online
|| !(stp_info
.vbits
& 0x0800))
752 return sprintf(buf
, "%i\n", (int) stp_info
.tto
);
755 static DEVICE_ATTR(time_offset
, 0400, stp_time_offset_show
, NULL
);
757 static ssize_t
stp_time_zone_offset_show(struct device
*dev
,
758 struct device_attribute
*attr
,
761 if (!stp_online
|| !(stp_info
.vbits
& 0x4000))
763 return sprintf(buf
, "%i\n", (int)(s16
) stp_info
.tzo
);
766 static DEVICE_ATTR(time_zone_offset
, 0400,
767 stp_time_zone_offset_show
, NULL
);
769 static ssize_t
stp_timing_mode_show(struct device
*dev
,
770 struct device_attribute
*attr
,
775 return sprintf(buf
, "%i\n", stp_info
.tmd
);
778 static DEVICE_ATTR(timing_mode
, 0400, stp_timing_mode_show
, NULL
);
780 static ssize_t
stp_timing_state_show(struct device
*dev
,
781 struct device_attribute
*attr
,
786 return sprintf(buf
, "%i\n", stp_info
.tst
);
789 static DEVICE_ATTR(timing_state
, 0400, stp_timing_state_show
, NULL
);
791 static ssize_t
stp_online_show(struct device
*dev
,
792 struct device_attribute
*attr
,
795 return sprintf(buf
, "%i\n", stp_online
);
798 static ssize_t
stp_online_store(struct device
*dev
,
799 struct device_attribute
*attr
,
800 const char *buf
, size_t count
)
804 value
= simple_strtoul(buf
, NULL
, 0);
805 if (value
!= 0 && value
!= 1)
807 if (!test_bit(CLOCK_SYNC_HAS_STP
, &clock_sync_flags
))
809 mutex_lock(&clock_sync_mutex
);
812 set_bit(CLOCK_SYNC_STP
, &clock_sync_flags
);
814 clear_bit(CLOCK_SYNC_STP
, &clock_sync_flags
);
815 queue_work(time_sync_wq
, &stp_work
);
816 mutex_unlock(&clock_sync_mutex
);
821 * Can't use DEVICE_ATTR because the attribute should be named
822 * stp/online but dev_attr_online already exists in this file ..
824 static struct device_attribute dev_attr_stp_online
= {
825 .attr
= { .name
= "online", .mode
= 0600 },
826 .show
= stp_online_show
,
827 .store
= stp_online_store
,
830 static struct device_attribute
*stp_attributes
[] = {
833 &dev_attr_dst_offset
,
834 &dev_attr_leap_seconds
,
835 &dev_attr_stp_online
,
837 &dev_attr_time_offset
,
838 &dev_attr_time_zone_offset
,
839 &dev_attr_timing_mode
,
840 &dev_attr_timing_state
,
844 static int __init
stp_init_sysfs(void)
846 struct device_attribute
**attr
;
849 rc
= subsys_system_register(&stp_subsys
, NULL
);
852 for (attr
= stp_attributes
; *attr
; attr
++) {
853 rc
= device_create_file(stp_subsys
.dev_root
, *attr
);
859 for (; attr
>= stp_attributes
; attr
--)
860 device_remove_file(stp_subsys
.dev_root
, *attr
);
861 bus_unregister(&stp_subsys
);
866 device_initcall(stp_init_sysfs
);