sys/kern/kern_clocksource.c

76 		if (timer->et_flags & ET_FLAGS_PERCPU)			\
84 		if (timer->et_flags & ET_FLAGS_PERCPU)			\
90 static struct eventtimer *timer = NULL;
94 static sbintime_t	nexttick;	/* Next global timer tick time. */
98 static char		timername[32];	/* Wanted timer. */
99 TUNABLE_STR("kern.eventtimer.timer", timername, sizeof(timername));
114 	struct mtx	et_hw_mtx;	/* Per-CPU timer mutex. */
119 	sbintime_t	nexttick;	/* Next timer tick time. */
222 		    (timer->et_flags & ET_FLAGS_PERCPU));
283 	if ((timer->et_flags & ET_FLAGS_PERCPU) == 0) {
300 /* Hardware timer callback function. */
376  * Load new value into hardware timer.
387 	if (timer->et_flags & ET_FLAGS_PERCPU) {
406 			et_start(timer, new, timerperiod);
415 			et_start(timer, new - now, 0);
421  * Prepare event timer parameters after configuration changes.
428 	if (periodic && (timer->et_flags & ET_FLAGS_PERIODIC) == 0)
430 	else if (!periodic && (timer->et_flags & ET_FLAGS_ONESHOT) == 0)
436 	freq = round_freq(timer, freq);
441  * Reconfigure specified per-CPU timer on other CPU. Called from IPI handler.
461 		et_stop(timer);
476  * Reconfigure specified timer.
524 		/* Start global timer or per-CPU timer of this CPU. */
528 		/* Stop global timer or per-CPU timer of this CPU. */
529 		et_stop(timer);
534 	/* If timer is global we are done. */
535 	if ((timer->et_flags & ET_FLAGS_PERCPU) == 0) {
537 	/* If timer is global or there is no other CPUs yet - we are done. */
538 	if ((timer->et_flags & ET_FLAGS_PERCPU) == 0 || !smp_started) {
566  * Calculate nearest frequency supported by hardware timer.
580 		panic("Event timer \"%s\" doesn't support sub-second periods!",
606 	/* Grab requested timer or the best of present. */
608 		timer = et_find(timername, 0, 0);
609 	if (timer == NULL && periodic) {
610 		timer = et_find(NULL,
613 	if (timer == NULL) {
614 		timer = et_find(NULL,
617 	if (timer == NULL && !periodic) {
618 		timer = et_find(NULL,
621 	if (timer == NULL)
622 		panic("No usable event timer found!");
623 	et_init(timer, timercb, NULL, NULL);
625 	/* Adapt to timer capabilities. */
626 	if (periodic && (timer->et_flags & ET_FLAGS_PERIODIC) == 0)
628 	else if (!periodic && (timer->et_flags & ET_FLAGS_ONESHOT) == 0)
630 	if (timer->et_flags & ET_FLAGS_C3STOP)
647 		base = round_freq(timer, hz * singlemul);
661 		profhz = round_freq(timer, profhz);
663 		hz = round_freq(timer, hz);
664 		stathz = round_freq(timer, 127);
665 		profhz = round_freq(timer, stathz * 64);
767 	    (periodic && (timer->et_flags & ET_FLAGS_PERCPU))
818  * Change the frequency of the given timer.  This changes et->et_frequency and
819  * if et is the active timer it reconfigures the timer on all CPUs.  This is
827 	if (et == timer) {
867 	/* If timer is periodic -- there is nothing to reprogram. */
870 	/* If timer is global or of the current CPU -- reprogram it. */
871 	if ((timer->et_flags & ET_FLAGS_PERCPU) == 0 || cpu == curcpu) {
896 	et = timer;
901 	et = timer;
913 	et_free(timer);
916 	if (timer->et_flags & ET_FLAGS_C3STOP)
919 	timer = et;
920 	et_init(timer, timercb, NULL, NULL);
925 SYSCTL_PROC(_kern_eventtimer, OID_AUTO, timer,
927     0, 0, sysctl_kern_eventtimer_timer, "A", "Chosen event timer");
930  * Report or change the active event timer periodicity.
950     0, 0, sysctl_kern_eventtimer_periodic, "I", "Enable event timer periodic mode");