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));
116 	struct mtx	et_hw_mtx;	/* Per-CPU timer mutex. */
121 	sbintime_t	nexttick;	/* Next timer tick time. */
224 		    (timer->et_flags & ET_FLAGS_PERCPU));
283 	if ((timer->et_flags & ET_FLAGS_PERCPU) == 0) {
298 /* Hardware timer callback function. */
367  * Load new value into hardware timer.
378 	if (timer->et_flags & ET_FLAGS_PERCPU) {
397 			et_start(timer, new, timerperiod);
406 			et_start(timer, new - now, 0);
412  * Prepare event timer parameters after configuration changes.
419 	if (periodic && (timer->et_flags & ET_FLAGS_PERIODIC) == 0)
421 	else if (!periodic && (timer->et_flags & ET_FLAGS_ONESHOT) == 0)
427 	freq = round_freq(timer, freq);
432  * Reconfigure specified per-CPU timer on other CPU. Called from IPI handler.
452 		et_stop(timer);
467  * Reconfigure specified timer.
510 		/* Start global timer or per-CPU timer of this CPU. */
514 		/* Stop global timer or per-CPU timer of this CPU. */
515 		et_stop(timer);
519 	/* If timer is global or there is no other CPUs yet - we are done. */
520 	if ((timer->et_flags & ET_FLAGS_PERCPU) == 0 || !smp_started) {
547  * Calculate nearest frequency supported by hardware timer.
561 		panic("Event timer \"%s\" doesn't support sub-second periods!",
587 	/* Grab requested timer or the best of present. */
589 		timer = et_find(timername, 0, 0);
590 	if (timer == NULL && periodic) {
591 		timer = et_find(NULL,
594 	if (timer == NULL) {
595 		timer = et_find(NULL,
598 	if (timer == NULL && !periodic) {
599 		timer = et_find(NULL,
602 	if (timer == NULL)
603 		panic("No usable event timer found!");
604 	et_init(timer, timercb, NULL, NULL);
606 	/* Adapt to timer capabilities. */
607 	if (periodic && (timer->et_flags & ET_FLAGS_PERIODIC) == 0)
609 	else if (!periodic && (timer->et_flags & ET_FLAGS_ONESHOT) == 0)
611 	if (timer->et_flags & ET_FLAGS_C3STOP)
628 		base = round_freq(timer, hz * singlemul);
642 		profhz = round_freq(timer, profhz);
644 		hz = round_freq(timer, hz);
645 		stathz = round_freq(timer, 127);
646 		profhz = round_freq(timer, stathz * 64);
732 	    (periodic && (timer->et_flags & ET_FLAGS_PERCPU))
783  * Change the frequency of the given timer.  This changes et->et_frequency and
784  * if et is the active timer it reconfigures the timer on all CPUs.  This is
792 	if (et == timer) {
830 	/* If timer is periodic -- there is nothing to reprogram. */
833 	/* If timer is global or of the current CPU -- reprogram it. */
834 	if ((timer->et_flags & ET_FLAGS_PERCPU) == 0 || cpu == curcpu) {
859 	et = timer;
864 	et = timer;
876 	et_free(timer);
879 	if (timer->et_flags & ET_FLAGS_C3STOP)
882 	timer = et;
883 	et_init(timer, timercb, NULL, NULL);
888 SYSCTL_PROC(_kern_eventtimer, OID_AUTO, timer,
890     0, 0, sysctl_kern_eventtimer_timer, "A", "Chosen event timer");
893  * Report or change the active event timer periodicity.
913     0, 0, sysctl_kern_eventtimer_periodic, "I", "Enable event timer periodic mode");