1 // SPDX-License-Identifier: GPL-2.0
60 u64 clock_comparator_max = -1ULL;
110  * Scheduler clock - returns current time in nanosec units.
122 	sec = clk->us;  in ext_to_timespec64()
124 	nsec = ((clk->sus + (rem << 12)) * 125) >> 9;  in ext_to_timespec64()
125 	xt->tv_sec = sec;  in ext_to_timespec64()
126 	xt->tv_nsec = nsec;  in ext_to_timespec64()
133 	get_lowcore()->clock_comparator = clock_comparator_max;  in clock_comparator_work()
135 	cd->event_handler(cd);  in clock_comparator_work()
141 	get_lowcore()->clock_comparator = get_tod_clock() + delta;  in s390_next_event()
142 	set_clock_comparator(get_lowcore()->clock_comparator);  in s390_next_event()
155 	get_lowcore()->clock_comparator = clock_comparator_max;  in init_cpu_timer()
156 	set_clock_comparator(get_lowcore()->clock_comparator);  in init_cpu_timer()
160 	cd->name		= "comparator";  in init_cpu_timer()
161 	cd->features		= CLOCK_EVT_FEAT_ONESHOT;  in init_cpu_timer()
162 	cd->mult		= 16777;  in init_cpu_timer()
163 	cd->shift		= 12;  in init_cpu_timer()
164 	cd->min_delta_ns	= 1;  in init_cpu_timer()
165 	cd->min_delta_ticks	= 1;  in init_cpu_timer()
166 	cd->max_delta_ns	= LONG_MAX;  in init_cpu_timer()
167 	cd->max_delta_ticks	= ULONG_MAX;  in init_cpu_timer()
168 	cd->rating		= 400;  in init_cpu_timer()
169 	cd->cpumask		= cpumask_of(cpu);  in init_cpu_timer()
170 	cd->set_next_event	= s390_next_event;  in init_cpu_timer()
177 	/* Always allow the timing alert external interrupt. */  in init_cpu_timer()
186 	if (get_lowcore()->clock_comparator == clock_comparator_max)  in clock_comparator_interrupt()
187 		set_clock_comparator(get_lowcore()->clock_comparator);  in clock_comparator_interrupt()
209 	clk.eitod -= delta;  in read_persistent_clock64()
222 	clk.eitod -= delta;  in read_persistent_wall_and_boot_offset()
235 	adj = tod_steering_end - now;  in read_tod_clock()
243 		now += (tod_steering_delta < 0) ? (adj >> 15) : -(adj >> 15);  in read_tod_clock()
278 	/* request the timing alert external interrupt */  in time_init()
304  * source. If the clock mode is local it will return -EOPNOTSUPP and
305  * -EAGAIN if the clock is not in sync with the external reference.
314 	*clock = get_tod_clock() - lpar_offset;  in get_phys_clock()
321 		return -EOPNOTSUPP;  in get_phys_clock()
323 		return -EACCES;  in get_phys_clock()
324 	return -EAGAIN;  in get_phys_clock()
329  * Make get_phys_clock() return -EAGAIN.
335 	 * Clear the in-sync bit 2^31. All get_phys_clock calls will  in disable_sync_clock()
382 	adj = tod_steering_end - now;  in clock_sync_global()
384 		/* Calculate how much of the old adjustment is left. */  in clock_sync_global()
386 			-(adj >> 15) : (adj >> 15);  in clock_sync_global()
405  * Apply clock delta to the per-CPU data structures of this CPU.
411 	if (get_lowcore()->clock_comparator != clock_comparator_max) {  in clock_sync_local()
412 		get_lowcore()->clock_comparator += delta;  in clock_sync_local()
413 		set_clock_comparator(get_lowcore()->clock_comparator);  in clock_sync_local()
415 	/* Adjust the last_update_clock time-stamp. */  in clock_sync_local()
416 	get_lowcore()->last_update_clock += delta;  in clock_sync_local()
497  * STP timing alert. There are three causes:
498  * 1) timing status change
506 	if (intparm->tsc || intparm->lac || intparm->tcpc)  in stp_timing_alert()
511  * STP sync check machine check. This is called when the timing state
525  * have matching CTN ids and have a valid stratum-1 configuration
565 		while (atomic_read(&sync->cpus) != 0)  in stp_sync_clock()
573 				sync->clock_delta = clock_delta;  in stp_sync_clock()
577 					rc = -EAGAIN;  in stp_sync_clock()
581 		sync->in_sync = rc ? -EAGAIN : 1;  in stp_sync_clock()
585 		atomic_dec(&sync->cpus);  in stp_sync_clock()
587 		while (READ_ONCE(sync->in_sync) == 0)  in stp_sync_clock()
590 	if (sync->in_sync != 1)  in stp_sync_clock()
591 		/* Didn't work. Clear per-cpu in sync bit again. */  in stp_sync_clock()
593 	/* Apply clock delta to per-CPU fields of this CPU. */  in stp_sync_clock()
594 	clock_sync_local(sync->clock_delta);  in stp_sync_clock()
639 	timediff = tod_to_ns(lsoib->nlsout - get_tod_clock()) / NSEC_PER_SEC;  in stp_check_leap()
640 	leapdiff = lsoib->nlso - lsoib->also;  in stp_check_leap()
642 	if (leapdiff != 1 && leapdiff != -1) {  in stp_check_leap()
704 		atomic_set(&stp_sync.cpus, num_online_cpus() - 1);  in stp_work_fn()
734 	ssize_t ret = -ENODATA;  in ctn_id_show()
750 	ssize_t ret = -ENODATA;  in ctn_type_show()
765 	ssize_t ret = -ENODATA;  in dst_offset_show()
780 	ssize_t ret = -ENODATA;  in leap_seconds_show()
801 		return -ENODATA;  in leap_seconds_scheduled_show()
813 			  tod_to_ns(stzi.lsoib.nlsout - TOD_UNIX_EPOCH) / NSEC_PER_SEC,  in leap_seconds_scheduled_show()
814 			  stzi.lsoib.nlso - stzi.lsoib.also);  in leap_seconds_scheduled_show()
823 	ssize_t ret = -ENODATA;  in stratum_show()
838 	ssize_t ret = -ENODATA;  in time_offset_show()
853 	ssize_t ret = -ENODATA;  in time_zone_offset_show()
868 	ssize_t ret = -ENODATA;  in timing_mode_show()
883 	ssize_t ret = -ENODATA;  in timing_state_show()
909 		return -EINVAL;  in online_store()
911 		return -EOPNOTSUPP;  in online_store()