2 * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
35 #include <sys/cpuset.h>
36 #include <sys/rtprio.h>
37 #include <sys/systm.h>
38 #include <sys/interrupt.h>
39 #include <sys/kernel.h>
40 #include <sys/kthread.h>
42 #include <sys/limits.h>
44 #include <sys/malloc.h>
45 #include <sys/mutex.h>
48 #include <sys/random.h>
49 #include <sys/resourcevar.h>
50 #include <sys/sched.h>
52 #include <sys/sysctl.h>
53 #include <sys/syslog.h>
54 #include <sys/unistd.h>
55 #include <sys/vmmeter.h>
56 #include <machine/atomic.h>
57 #include <machine/cpu.h>
58 #include <machine/md_var.h>
59 #include <machine/stdarg.h>
62 #include <ddb/db_sym.h>
66 * Describe an interrupt thread. There is one of these per interrupt event.
69 struct intr_event *it_event;
70 struct thread *it_thread; /* Kernel thread. */
71 int it_flags; /* (j) IT_* flags. */
72 int it_need; /* Needs service. */
75 /* Interrupt thread flags kept in it_flags */
76 #define IT_DEAD 0x000001 /* Thread is waiting to exit. */
77 #define IT_WAIT 0x000002 /* Thread is waiting for completion. */
84 struct intr_event *clk_intr_event;
85 struct intr_event *tty_intr_event;
87 struct proc *intrproc;
89 static MALLOC_DEFINE(M_ITHREAD, "ithread", "Interrupt Threads");
91 static int intr_storm_threshold = 1000;
92 TUNABLE_INT("hw.intr_storm_threshold", &intr_storm_threshold);
93 SYSCTL_INT(_hw, OID_AUTO, intr_storm_threshold, CTLFLAG_RW,
94 &intr_storm_threshold, 0,
95 "Number of consecutive interrupts before storm protection is enabled");
96 static TAILQ_HEAD(, intr_event) event_list =
97 TAILQ_HEAD_INITIALIZER(event_list);
98 static struct mtx event_lock;
99 MTX_SYSINIT(intr_event_list, &event_lock, "intr event list", MTX_DEF);
101 static void intr_event_update(struct intr_event *ie);
103 static int intr_event_schedule_thread(struct intr_event *ie,
104 struct intr_thread *ithd);
105 static int intr_filter_loop(struct intr_event *ie,
106 struct trapframe *frame, struct intr_thread **ithd);
107 static struct intr_thread *ithread_create(const char *name,
108 struct intr_handler *ih);
110 static int intr_event_schedule_thread(struct intr_event *ie);
111 static struct intr_thread *ithread_create(const char *name);
113 static void ithread_destroy(struct intr_thread *ithread);
114 static void ithread_execute_handlers(struct proc *p,
115 struct intr_event *ie);
117 static void priv_ithread_execute_handler(struct proc *p,
118 struct intr_handler *ih);
120 static void ithread_loop(void *);
121 static void ithread_update(struct intr_thread *ithd);
122 static void start_softintr(void *);
124 /* Map an interrupt type to an ithread priority. */
126 intr_priority(enum intr_type flags)
130 flags &= (INTR_TYPE_TTY | INTR_TYPE_BIO | INTR_TYPE_NET |
131 INTR_TYPE_CAM | INTR_TYPE_MISC | INTR_TYPE_CLK | INTR_TYPE_AV);
152 pri = PI_DULL; /* don't care */
155 /* We didn't specify an interrupt level. */
156 panic("intr_priority: no interrupt type in flags");
163 * Update an ithread based on the associated intr_event.
166 ithread_update(struct intr_thread *ithd)
168 struct intr_event *ie;
173 td = ithd->it_thread;
175 /* Determine the overall priority of this event. */
176 if (TAILQ_EMPTY(&ie->ie_handlers))
179 pri = TAILQ_FIRST(&ie->ie_handlers)->ih_pri;
181 /* Update name and priority. */
182 strlcpy(td->td_name, ie->ie_fullname, sizeof(td->td_name));
184 sched_clear_tdname(td);
192 * Regenerate the full name of an interrupt event and update its priority.
195 intr_event_update(struct intr_event *ie)
197 struct intr_handler *ih;
201 /* Start off with no entropy and just the name of the event. */
202 mtx_assert(&ie->ie_lock, MA_OWNED);
203 strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname));
204 ie->ie_flags &= ~IE_ENTROPY;
208 /* Run through all the handlers updating values. */
209 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
210 if (strlen(ie->ie_fullname) + strlen(ih->ih_name) + 1 <
211 sizeof(ie->ie_fullname)) {
212 strcat(ie->ie_fullname, " ");
213 strcat(ie->ie_fullname, ih->ih_name);
217 if (ih->ih_flags & IH_ENTROPY)
218 ie->ie_flags |= IE_ENTROPY;
222 * If the handler names were too long, add +'s to indicate missing
223 * names. If we run out of room and still have +'s to add, change
224 * the last character from a + to a *.
226 last = &ie->ie_fullname[sizeof(ie->ie_fullname) - 2];
227 while (missed-- > 0) {
228 if (strlen(ie->ie_fullname) + 1 == sizeof(ie->ie_fullname)) {
235 strcat(ie->ie_fullname, " +");
238 strcat(ie->ie_fullname, "+");
242 * If this event has an ithread, update it's priority and
245 if (ie->ie_thread != NULL)
246 ithread_update(ie->ie_thread);
247 CTR2(KTR_INTR, "%s: updated %s", __func__, ie->ie_fullname);
251 intr_event_create(struct intr_event **event, void *source, int flags, int irq,
252 void (*pre_ithread)(void *), void (*post_ithread)(void *),
253 void (*post_filter)(void *), int (*assign_cpu)(void *, u_char),
254 const char *fmt, ...)
256 struct intr_event *ie;
259 /* The only valid flag during creation is IE_SOFT. */
260 if ((flags & ~IE_SOFT) != 0)
262 ie = malloc(sizeof(struct intr_event), M_ITHREAD, M_WAITOK | M_ZERO);
263 ie->ie_source = source;
264 ie->ie_pre_ithread = pre_ithread;
265 ie->ie_post_ithread = post_ithread;
266 ie->ie_post_filter = post_filter;
267 ie->ie_assign_cpu = assign_cpu;
268 ie->ie_flags = flags;
271 TAILQ_INIT(&ie->ie_handlers);
272 mtx_init(&ie->ie_lock, "intr event", NULL, MTX_DEF);
275 vsnprintf(ie->ie_name, sizeof(ie->ie_name), fmt, ap);
277 strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname));
278 mtx_lock(&event_lock);
279 TAILQ_INSERT_TAIL(&event_list, ie, ie_list);
280 mtx_unlock(&event_lock);
283 CTR2(KTR_INTR, "%s: created %s", __func__, ie->ie_name);
288 * Bind an interrupt event to the specified CPU. Note that not all
289 * platforms support binding an interrupt to a CPU. For those
290 * platforms this request will fail. For supported platforms, any
291 * associated ithreads as well as the primary interrupt context will
292 * be bound to the specificed CPU. Using a cpu id of NOCPU unbinds
293 * the interrupt event.
296 intr_event_bind(struct intr_event *ie, u_char cpu)
302 /* Need a CPU to bind to. */
303 if (cpu != NOCPU && CPU_ABSENT(cpu))
306 if (ie->ie_assign_cpu == NULL)
309 error = priv_check(curthread, PRIV_SCHED_CPUSET_INTR);
314 * If we have any ithreads try to set their mask first to verify
317 mtx_lock(&ie->ie_lock);
318 if (ie->ie_thread != NULL) {
321 CPU_COPY(cpuset_root, &mask);
324 id = ie->ie_thread->it_thread->td_tid;
325 mtx_unlock(&ie->ie_lock);
326 error = cpuset_setthread(id, &mask);
330 mtx_unlock(&ie->ie_lock);
331 error = ie->ie_assign_cpu(ie->ie_source, cpu);
333 mtx_lock(&ie->ie_lock);
334 if (ie->ie_thread != NULL) {
336 if (ie->ie_cpu == NOCPU)
337 CPU_COPY(cpuset_root, &mask);
340 id = ie->ie_thread->it_thread->td_tid;
341 mtx_unlock(&ie->ie_lock);
342 (void)cpuset_setthread(id, &mask);
344 mtx_unlock(&ie->ie_lock);
348 mtx_lock(&ie->ie_lock);
350 mtx_unlock(&ie->ie_lock);
355 static struct intr_event *
358 struct intr_event *ie;
360 mtx_lock(&event_lock);
361 TAILQ_FOREACH(ie, &event_list, ie_list)
362 if (ie->ie_irq == irq &&
363 (ie->ie_flags & IE_SOFT) == 0 &&
364 TAILQ_FIRST(&ie->ie_handlers) != NULL)
366 mtx_unlock(&event_lock);
371 intr_setaffinity(int irq, void *m)
373 struct intr_event *ie;
381 * If we're setting all cpus we can unbind. Otherwise make sure
382 * only one cpu is in the set.
384 if (CPU_CMP(cpuset_root, mask)) {
385 for (n = 0; n < CPU_SETSIZE; n++) {
386 if (!CPU_ISSET(n, mask))
393 ie = intr_lookup(irq);
396 return (intr_event_bind(ie, cpu));
400 intr_getaffinity(int irq, void *m)
402 struct intr_event *ie;
406 ie = intr_lookup(irq);
410 mtx_lock(&ie->ie_lock);
411 if (ie->ie_cpu == NOCPU)
412 CPU_COPY(cpuset_root, mask);
414 CPU_SET(ie->ie_cpu, mask);
415 mtx_unlock(&ie->ie_lock);
420 intr_event_destroy(struct intr_event *ie)
423 mtx_lock(&event_lock);
424 mtx_lock(&ie->ie_lock);
425 if (!TAILQ_EMPTY(&ie->ie_handlers)) {
426 mtx_unlock(&ie->ie_lock);
427 mtx_unlock(&event_lock);
430 TAILQ_REMOVE(&event_list, ie, ie_list);
432 if (ie->ie_thread != NULL) {
433 ithread_destroy(ie->ie_thread);
434 ie->ie_thread = NULL;
437 mtx_unlock(&ie->ie_lock);
438 mtx_unlock(&event_lock);
439 mtx_destroy(&ie->ie_lock);
445 static struct intr_thread *
446 ithread_create(const char *name)
448 struct intr_thread *ithd;
452 ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO);
454 error = kproc_kthread_add(ithread_loop, ithd, &intrproc,
455 &td, RFSTOPPED | RFHIGHPID,
456 0, "intr", "%s", name);
458 panic("kproc_create() failed with %d", error);
460 sched_class(td, PRI_ITHD);
463 td->td_pflags |= TDP_ITHREAD;
464 ithd->it_thread = td;
465 CTR2(KTR_INTR, "%s: created %s", __func__, name);
469 static struct intr_thread *
470 ithread_create(const char *name, struct intr_handler *ih)
472 struct intr_thread *ithd;
476 ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO);
478 error = kproc_kthread_add(ithread_loop, ih, &intrproc,
479 &td, RFSTOPPED | RFHIGHPID,
480 0, "intr", "%s", name);
482 panic("kproc_create() failed with %d", error);
484 sched_class(td, PRI_ITHD);
487 td->td_pflags |= TDP_ITHREAD;
488 ithd->it_thread = td;
489 CTR2(KTR_INTR, "%s: created %s", __func__, name);
495 ithread_destroy(struct intr_thread *ithread)
499 CTR2(KTR_INTR, "%s: killing %s", __func__, ithread->it_event->ie_name);
500 td = ithread->it_thread;
502 ithread->it_flags |= IT_DEAD;
503 if (TD_AWAITING_INTR(td)) {
505 sched_add(td, SRQ_INTR);
512 intr_event_add_handler(struct intr_event *ie, const char *name,
513 driver_filter_t filter, driver_intr_t handler, void *arg, u_char pri,
514 enum intr_type flags, void **cookiep)
516 struct intr_handler *ih, *temp_ih;
517 struct intr_thread *it;
519 if (ie == NULL || name == NULL || (handler == NULL && filter == NULL))
522 /* Allocate and populate an interrupt handler structure. */
523 ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO);
524 ih->ih_filter = filter;
525 ih->ih_handler = handler;
526 ih->ih_argument = arg;
527 strlcpy(ih->ih_name, name, sizeof(ih->ih_name));
530 if (flags & INTR_EXCL)
531 ih->ih_flags = IH_EXCLUSIVE;
532 if (flags & INTR_MPSAFE)
533 ih->ih_flags |= IH_MPSAFE;
534 if (flags & INTR_ENTROPY)
535 ih->ih_flags |= IH_ENTROPY;
537 /* We can only have one exclusive handler in a event. */
538 mtx_lock(&ie->ie_lock);
539 if (!TAILQ_EMPTY(&ie->ie_handlers)) {
540 if ((flags & INTR_EXCL) ||
541 (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) {
542 mtx_unlock(&ie->ie_lock);
548 /* Create a thread if we need one. */
549 while (ie->ie_thread == NULL && handler != NULL) {
550 if (ie->ie_flags & IE_ADDING_THREAD)
551 msleep(ie, &ie->ie_lock, 0, "ithread", 0);
553 ie->ie_flags |= IE_ADDING_THREAD;
554 mtx_unlock(&ie->ie_lock);
555 it = ithread_create("intr: newborn");
556 mtx_lock(&ie->ie_lock);
557 ie->ie_flags &= ~IE_ADDING_THREAD;
565 /* Add the new handler to the event in priority order. */
566 TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) {
567 if (temp_ih->ih_pri > ih->ih_pri)
571 TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next);
573 TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next);
574 intr_event_update(ie);
576 CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name,
578 mtx_unlock(&ie->ie_lock);
586 intr_event_add_handler(struct intr_event *ie, const char *name,
587 driver_filter_t filter, driver_intr_t handler, void *arg, u_char pri,
588 enum intr_type flags, void **cookiep)
590 struct intr_handler *ih, *temp_ih;
591 struct intr_thread *it;
593 if (ie == NULL || name == NULL || (handler == NULL && filter == NULL))
596 /* Allocate and populate an interrupt handler structure. */
597 ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO);
598 ih->ih_filter = filter;
599 ih->ih_handler = handler;
600 ih->ih_argument = arg;
601 strlcpy(ih->ih_name, name, sizeof(ih->ih_name));
604 if (flags & INTR_EXCL)
605 ih->ih_flags = IH_EXCLUSIVE;
606 if (flags & INTR_MPSAFE)
607 ih->ih_flags |= IH_MPSAFE;
608 if (flags & INTR_ENTROPY)
609 ih->ih_flags |= IH_ENTROPY;
611 /* We can only have one exclusive handler in a event. */
612 mtx_lock(&ie->ie_lock);
613 if (!TAILQ_EMPTY(&ie->ie_handlers)) {
614 if ((flags & INTR_EXCL) ||
615 (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) {
616 mtx_unlock(&ie->ie_lock);
622 /* For filtered handlers, create a private ithread to run on. */
623 if (filter != NULL && handler != NULL) {
624 mtx_unlock(&ie->ie_lock);
625 it = ithread_create("intr: newborn", ih);
626 mtx_lock(&ie->ie_lock);
629 ithread_update(it); // XXX - do we really need this?!?!?
630 } else { /* Create the global per-event thread if we need one. */
631 while (ie->ie_thread == NULL && handler != NULL) {
632 if (ie->ie_flags & IE_ADDING_THREAD)
633 msleep(ie, &ie->ie_lock, 0, "ithread", 0);
635 ie->ie_flags |= IE_ADDING_THREAD;
636 mtx_unlock(&ie->ie_lock);
637 it = ithread_create("intr: newborn", ih);
638 mtx_lock(&ie->ie_lock);
639 ie->ie_flags &= ~IE_ADDING_THREAD;
648 /* Add the new handler to the event in priority order. */
649 TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) {
650 if (temp_ih->ih_pri > ih->ih_pri)
654 TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next);
656 TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next);
657 intr_event_update(ie);
659 CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name,
661 mtx_unlock(&ie->ie_lock);
670 * Append a description preceded by a ':' to the name of the specified
674 intr_event_describe_handler(struct intr_event *ie, void *cookie,
677 struct intr_handler *ih;
681 mtx_lock(&ie->ie_lock);
683 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
688 mtx_unlock(&ie->ie_lock);
689 panic("handler %p not found in interrupt event %p", cookie, ie);
695 * Look for an existing description by checking for an
696 * existing ":". This assumes device names do not include
697 * colons. If one is found, prepare to insert the new
698 * description at that point. If one is not found, find the
699 * end of the name to use as the insertion point.
701 start = index(ih->ih_name, ':');
703 start = index(ih->ih_name, 0);
706 * See if there is enough remaining room in the string for the
707 * description + ":". The "- 1" leaves room for the trailing
708 * '\0'. The "+ 1" accounts for the colon.
710 space = sizeof(ih->ih_name) - (start - ih->ih_name) - 1;
711 if (strlen(descr) + 1 > space) {
712 mtx_unlock(&ie->ie_lock);
716 /* Append a colon followed by the description. */
718 strcpy(start + 1, descr);
719 intr_event_update(ie);
720 mtx_unlock(&ie->ie_lock);
725 * Return the ie_source field from the intr_event an intr_handler is
729 intr_handler_source(void *cookie)
731 struct intr_handler *ih;
732 struct intr_event *ie;
734 ih = (struct intr_handler *)cookie;
739 ("interrupt handler \"%s\" has a NULL interrupt event",
741 return (ie->ie_source);
745 * Sleep until an ithread finishes executing an interrupt handler.
747 * XXX Doesn't currently handle interrupt filters or fast interrupt
748 * handlers. This is intended for compatibility with linux drivers
749 * only. Do not use in BSD code.
754 struct intr_event *ie;
755 struct intr_thread *ithd;
758 ie = intr_lookup(irq);
761 if (ie->ie_thread == NULL)
763 ithd = ie->ie_thread;
764 td = ithd->it_thread;
766 * We set the flag and wait for it to be cleared to avoid
767 * long delays with potentially busy interrupt handlers
768 * were we to only sample TD_AWAITING_INTR() every tick.
771 if (!TD_AWAITING_INTR(td)) {
772 ithd->it_flags |= IT_WAIT;
773 while (ithd->it_flags & IT_WAIT) {
786 intr_event_remove_handler(void *cookie)
788 struct intr_handler *handler = (struct intr_handler *)cookie;
789 struct intr_event *ie;
791 struct intr_handler *ih;
799 ie = handler->ih_event;
801 ("interrupt handler \"%s\" has a NULL interrupt event",
803 mtx_lock(&ie->ie_lock);
804 CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name,
807 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next)
810 mtx_unlock(&ie->ie_lock);
811 panic("interrupt handler \"%s\" not found in interrupt event \"%s\"",
812 ih->ih_name, ie->ie_name);
816 * If there is no ithread, then just remove the handler and return.
817 * XXX: Note that an INTR_FAST handler might be running on another
820 if (ie->ie_thread == NULL) {
821 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next);
822 mtx_unlock(&ie->ie_lock);
823 free(handler, M_ITHREAD);
828 * If the interrupt thread is already running, then just mark this
829 * handler as being dead and let the ithread do the actual removal.
831 * During a cold boot while cold is set, msleep() does not sleep,
832 * so we have to remove the handler here rather than letting the
835 thread_lock(ie->ie_thread->it_thread);
836 if (!TD_AWAITING_INTR(ie->ie_thread->it_thread) && !cold) {
837 handler->ih_flags |= IH_DEAD;
840 * Ensure that the thread will process the handler list
841 * again and remove this handler if it has already passed
844 atomic_store_rel_int(&ie->ie_thread->it_need, 1);
846 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next);
847 thread_unlock(ie->ie_thread->it_thread);
848 while (handler->ih_flags & IH_DEAD)
849 msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0);
850 intr_event_update(ie);
853 * XXX: This could be bad in the case of ppbus(8). Also, I think
854 * this could lead to races of stale data when servicing an
858 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
859 if (!(ih->ih_flags & IH_FAST)) {
865 ithread_destroy(ie->ie_thread);
866 ie->ie_thread = NULL;
869 mtx_unlock(&ie->ie_lock);
870 free(handler, M_ITHREAD);
875 intr_event_schedule_thread(struct intr_event *ie)
877 struct intr_entropy entropy;
878 struct intr_thread *it;
884 * If no ithread or no handlers, then we have a stray interrupt.
886 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) ||
887 ie->ie_thread == NULL)
896 * If any of the handlers for this ithread claim to be good
897 * sources of entropy, then gather some.
899 if (harvest.interrupt && ie->ie_flags & IE_ENTROPY) {
900 CTR3(KTR_INTR, "%s: pid %d (%s) gathering entropy", __func__,
901 p->p_pid, td->td_name);
902 entropy.event = (uintptr_t)ie;
904 random_harvest(&entropy, sizeof(entropy), 2, 0,
908 KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name));
911 * Set it_need to tell the thread to keep running if it is already
912 * running. Then, lock the thread and see if we actually need to
913 * put it on the runqueue.
915 atomic_store_rel_int(&it->it_need, 1);
917 if (TD_AWAITING_INTR(td)) {
918 CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid,
921 sched_add(td, SRQ_INTR);
923 CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d",
924 __func__, p->p_pid, td->td_name, it->it_need, td->td_state);
932 intr_event_remove_handler(void *cookie)
934 struct intr_handler *handler = (struct intr_handler *)cookie;
935 struct intr_event *ie;
936 struct intr_thread *it;
938 struct intr_handler *ih;
946 ie = handler->ih_event;
948 ("interrupt handler \"%s\" has a NULL interrupt event",
950 mtx_lock(&ie->ie_lock);
951 CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name,
954 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next)
957 mtx_unlock(&ie->ie_lock);
958 panic("interrupt handler \"%s\" not found in interrupt event \"%s\"",
959 ih->ih_name, ie->ie_name);
963 * If there are no ithreads (per event and per handler), then
964 * just remove the handler and return.
965 * XXX: Note that an INTR_FAST handler might be running on another CPU!
967 if (ie->ie_thread == NULL && handler->ih_thread == NULL) {
968 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next);
969 mtx_unlock(&ie->ie_lock);
970 free(handler, M_ITHREAD);
974 /* Private or global ithread? */
975 it = (handler->ih_thread) ? handler->ih_thread : ie->ie_thread;
977 * If the interrupt thread is already running, then just mark this
978 * handler as being dead and let the ithread do the actual removal.
980 * During a cold boot while cold is set, msleep() does not sleep,
981 * so we have to remove the handler here rather than letting the
984 thread_lock(it->it_thread);
985 if (!TD_AWAITING_INTR(it->it_thread) && !cold) {
986 handler->ih_flags |= IH_DEAD;
989 * Ensure that the thread will process the handler list
990 * again and remove this handler if it has already passed
993 atomic_store_rel_int(&it->it_need, 1);
995 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next);
996 thread_unlock(it->it_thread);
997 while (handler->ih_flags & IH_DEAD)
998 msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0);
1000 * At this point, the handler has been disconnected from the event,
1001 * so we can kill the private ithread if any.
1003 if (handler->ih_thread) {
1004 ithread_destroy(handler->ih_thread);
1005 handler->ih_thread = NULL;
1007 intr_event_update(ie);
1010 * XXX: This could be bad in the case of ppbus(8). Also, I think
1011 * this could lead to races of stale data when servicing an
1015 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
1016 if (handler != NULL) {
1022 ithread_destroy(ie->ie_thread);
1023 ie->ie_thread = NULL;
1026 mtx_unlock(&ie->ie_lock);
1027 free(handler, M_ITHREAD);
1032 intr_event_schedule_thread(struct intr_event *ie, struct intr_thread *it)
1034 struct intr_entropy entropy;
1040 * If no ithread or no handlers, then we have a stray interrupt.
1042 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) || it == NULL)
1050 * If any of the handlers for this ithread claim to be good
1051 * sources of entropy, then gather some.
1053 if (harvest.interrupt && ie->ie_flags & IE_ENTROPY) {
1054 CTR3(KTR_INTR, "%s: pid %d (%s) gathering entropy", __func__,
1055 p->p_pid, td->td_name);
1056 entropy.event = (uintptr_t)ie;
1058 random_harvest(&entropy, sizeof(entropy), 2, 0,
1062 KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name));
1065 * Set it_need to tell the thread to keep running if it is already
1066 * running. Then, lock the thread and see if we actually need to
1067 * put it on the runqueue.
1069 atomic_store_rel_int(&it->it_need, 1);
1071 if (TD_AWAITING_INTR(td)) {
1072 CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid,
1075 sched_add(td, SRQ_INTR);
1077 CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d",
1078 __func__, p->p_pid, td->td_name, it->it_need, td->td_state);
1087 * Allow interrupt event binding for software interrupt handlers -- a no-op,
1088 * since interrupts are generated in software rather than being directed by
1092 swi_assign_cpu(void *arg, u_char cpu)
1099 * Add a software interrupt handler to a specified event. If a given event
1100 * is not specified, then a new event is created.
1103 swi_add(struct intr_event **eventp, const char *name, driver_intr_t handler,
1104 void *arg, int pri, enum intr_type flags, void **cookiep)
1107 struct intr_event *ie;
1110 if (flags & INTR_ENTROPY)
1113 ie = (eventp != NULL) ? *eventp : NULL;
1116 if (!(ie->ie_flags & IE_SOFT))
1119 error = intr_event_create(&ie, NULL, IE_SOFT, 0,
1120 NULL, NULL, NULL, swi_assign_cpu, "swi%d:", pri);
1126 error = intr_event_add_handler(ie, name, NULL, handler, arg,
1127 PI_SWI(pri), flags, cookiep);
1130 if (pri == SWI_CLOCK) {
1131 td = ie->ie_thread->it_thread;
1133 td->td_flags |= TDF_NOLOAD;
1140 * Schedule a software interrupt thread.
1143 swi_sched(void *cookie, int flags)
1145 struct intr_handler *ih = (struct intr_handler *)cookie;
1146 struct intr_event *ie = ih->ih_event;
1147 struct intr_entropy entropy;
1150 CTR3(KTR_INTR, "swi_sched: %s %s need=%d", ie->ie_name, ih->ih_name,
1154 CTR2(KTR_INTR, "swi_sched: pid %d (%s) gathering entropy",
1155 curproc->p_pid, curthread->td_name);
1156 entropy.event = (uintptr_t)ih;
1157 entropy.td = curthread;
1158 random_harvest(&entropy, sizeof(entropy), 1, 0,
1163 * Set ih_need for this handler so that if the ithread is already
1164 * running it will execute this handler on the next pass. Otherwise,
1165 * it will execute it the next time it runs.
1167 atomic_store_rel_int(&ih->ih_need, 1);
1169 if (!(flags & SWI_DELAY)) {
1170 PCPU_INC(cnt.v_soft);
1172 error = intr_event_schedule_thread(ie, ie->ie_thread);
1174 error = intr_event_schedule_thread(ie);
1176 KASSERT(error == 0, ("stray software interrupt"));
1181 * Remove a software interrupt handler. Currently this code does not
1182 * remove the associated interrupt event if it becomes empty. Calling code
1183 * may do so manually via intr_event_destroy(), but that's not really
1184 * an optimal interface.
1187 swi_remove(void *cookie)
1190 return (intr_event_remove_handler(cookie));
1195 priv_ithread_execute_handler(struct proc *p, struct intr_handler *ih)
1197 struct intr_event *ie;
1201 * If this handler is marked for death, remove it from
1202 * the list of handlers and wake up the sleeper.
1204 if (ih->ih_flags & IH_DEAD) {
1205 mtx_lock(&ie->ie_lock);
1206 TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next);
1207 ih->ih_flags &= ~IH_DEAD;
1209 mtx_unlock(&ie->ie_lock);
1213 /* Execute this handler. */
1214 CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x",
1215 __func__, p->p_pid, (void *)ih->ih_handler, ih->ih_argument,
1216 ih->ih_name, ih->ih_flags);
1218 if (!(ih->ih_flags & IH_MPSAFE))
1220 ih->ih_handler(ih->ih_argument);
1221 if (!(ih->ih_flags & IH_MPSAFE))
1227 * This is a public function for use by drivers that mux interrupt
1228 * handlers for child devices from their interrupt handler.
1231 intr_event_execute_handlers(struct proc *p, struct intr_event *ie)
1233 struct intr_handler *ih, *ihn;
1235 TAILQ_FOREACH_SAFE(ih, &ie->ie_handlers, ih_next, ihn) {
1237 * If this handler is marked for death, remove it from
1238 * the list of handlers and wake up the sleeper.
1240 if (ih->ih_flags & IH_DEAD) {
1241 mtx_lock(&ie->ie_lock);
1242 TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next);
1243 ih->ih_flags &= ~IH_DEAD;
1245 mtx_unlock(&ie->ie_lock);
1249 /* Skip filter only handlers */
1250 if (ih->ih_handler == NULL)
1254 * For software interrupt threads, we only execute
1255 * handlers that have their need flag set. Hardware
1256 * interrupt threads always invoke all of their handlers.
1258 if (ie->ie_flags & IE_SOFT) {
1259 if (atomic_load_acq_int(&ih->ih_need) == 0)
1262 atomic_store_rel_int(&ih->ih_need, 0);
1265 /* Execute this handler. */
1266 CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x",
1267 __func__, p->p_pid, (void *)ih->ih_handler,
1268 ih->ih_argument, ih->ih_name, ih->ih_flags);
1270 if (!(ih->ih_flags & IH_MPSAFE))
1272 ih->ih_handler(ih->ih_argument);
1273 if (!(ih->ih_flags & IH_MPSAFE))
1279 ithread_execute_handlers(struct proc *p, struct intr_event *ie)
1282 /* Interrupt handlers should not sleep. */
1283 if (!(ie->ie_flags & IE_SOFT))
1284 THREAD_NO_SLEEPING();
1285 intr_event_execute_handlers(p, ie);
1286 if (!(ie->ie_flags & IE_SOFT))
1287 THREAD_SLEEPING_OK();
1290 * Interrupt storm handling:
1292 * If this interrupt source is currently storming, then throttle
1293 * it to only fire the handler once per clock tick.
1295 * If this interrupt source is not currently storming, but the
1296 * number of back to back interrupts exceeds the storm threshold,
1297 * then enter storming mode.
1299 if (intr_storm_threshold != 0 && ie->ie_count >= intr_storm_threshold &&
1300 !(ie->ie_flags & IE_SOFT)) {
1301 /* Report the message only once every second. */
1302 if (ppsratecheck(&ie->ie_warntm, &ie->ie_warncnt, 1)) {
1304 "interrupt storm detected on \"%s\"; throttling interrupt source\n",
1312 * Now that all the handlers have had a chance to run, reenable
1313 * the interrupt source.
1315 if (ie->ie_post_ithread != NULL)
1316 ie->ie_post_ithread(ie->ie_source);
1321 * This is the main code for interrupt threads.
1324 ithread_loop(void *arg)
1326 struct intr_thread *ithd;
1327 struct intr_event *ie;
1334 ithd = (struct intr_thread *)arg;
1335 KASSERT(ithd->it_thread == td,
1336 ("%s: ithread and proc linkage out of sync", __func__));
1337 ie = ithd->it_event;
1342 * As long as we have interrupts outstanding, go through the
1343 * list of handlers, giving each one a go at it.
1347 * If we are an orphaned thread, then just die.
1349 if (ithd->it_flags & IT_DEAD) {
1350 CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__,
1351 p->p_pid, td->td_name);
1352 free(ithd, M_ITHREAD);
1357 * Service interrupts. If another interrupt arrives while
1358 * we are running, it will set it_need to note that we
1359 * should make another pass.
1361 while (atomic_load_acq_int(&ithd->it_need) != 0) {
1363 * This might need a full read and write barrier
1364 * to make sure that this write posts before any
1365 * of the memory or device accesses in the
1368 atomic_store_rel_int(&ithd->it_need, 0);
1369 ithread_execute_handlers(p, ie);
1371 WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread");
1372 mtx_assert(&Giant, MA_NOTOWNED);
1375 * Processed all our interrupts. Now get the sched
1376 * lock. This may take a while and it_need may get
1377 * set again, so we have to check it again.
1380 if ((atomic_load_acq_int(&ithd->it_need) == 0) &&
1381 !(ithd->it_flags & (IT_DEAD | IT_WAIT))) {
1384 mi_switch(SW_VOL | SWT_IWAIT, NULL);
1386 if (ithd->it_flags & IT_WAIT) {
1388 ithd->it_flags &= ~IT_WAIT;
1399 * Main interrupt handling body.
1402 * o ie: the event connected to this interrupt.
1403 * o frame: some archs (i.e. i386) pass a frame to some.
1404 * handlers as their main argument.
1406 * o 0: everything ok.
1407 * o EINVAL: stray interrupt.
1410 intr_event_handle(struct intr_event *ie, struct trapframe *frame)
1412 struct intr_handler *ih;
1413 struct trapframe *oldframe;
1415 int error, ret, thread;
1419 /* An interrupt with no event or handlers is a stray interrupt. */
1420 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers))
1424 * Execute fast interrupt handlers directly.
1425 * To support clock handlers, if a handler registers
1426 * with a NULL argument, then we pass it a pointer to
1427 * a trapframe as its argument.
1429 td->td_intr_nesting_level++;
1433 oldframe = td->td_intr_frame;
1434 td->td_intr_frame = frame;
1435 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
1436 if (ih->ih_filter == NULL) {
1440 CTR4(KTR_INTR, "%s: exec %p(%p) for %s", __func__,
1441 ih->ih_filter, ih->ih_argument == NULL ? frame :
1442 ih->ih_argument, ih->ih_name);
1443 if (ih->ih_argument == NULL)
1444 ret = ih->ih_filter(frame);
1446 ret = ih->ih_filter(ih->ih_argument);
1447 KASSERT(ret == FILTER_STRAY ||
1448 ((ret & (FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) != 0 &&
1449 (ret & ~(FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) == 0),
1450 ("%s: incorrect return value %#x from %s", __func__, ret,
1454 * Wrapper handler special handling:
1456 * in some particular cases (like pccard and pccbb),
1457 * the _real_ device handler is wrapped in a couple of
1458 * functions - a filter wrapper and an ithread wrapper.
1459 * In this case (and just in this case), the filter wrapper
1460 * could ask the system to schedule the ithread and mask
1461 * the interrupt source if the wrapped handler is composed
1462 * of just an ithread handler.
1464 * TODO: write a generic wrapper to avoid people rolling
1468 if (ret == FILTER_SCHEDULE_THREAD)
1472 td->td_intr_frame = oldframe;
1475 if (ie->ie_pre_ithread != NULL)
1476 ie->ie_pre_ithread(ie->ie_source);
1478 if (ie->ie_post_filter != NULL)
1479 ie->ie_post_filter(ie->ie_source);
1482 /* Schedule the ithread if needed. */
1484 error = intr_event_schedule_thread(ie);
1486 KASSERT(error == 0, ("bad stray interrupt"));
1489 log(LOG_WARNING, "bad stray interrupt");
1493 td->td_intr_nesting_level--;
1498 * This is the main code for interrupt threads.
1501 ithread_loop(void *arg)
1503 struct intr_thread *ithd;
1504 struct intr_handler *ih;
1505 struct intr_event *ie;
1513 ih = (struct intr_handler *)arg;
1514 priv = (ih->ih_thread != NULL) ? 1 : 0;
1515 ithd = (priv) ? ih->ih_thread : ih->ih_event->ie_thread;
1516 KASSERT(ithd->it_thread == td,
1517 ("%s: ithread and proc linkage out of sync", __func__));
1518 ie = ithd->it_event;
1523 * As long as we have interrupts outstanding, go through the
1524 * list of handlers, giving each one a go at it.
1528 * If we are an orphaned thread, then just die.
1530 if (ithd->it_flags & IT_DEAD) {
1531 CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__,
1532 p->p_pid, td->td_name);
1533 free(ithd, M_ITHREAD);
1538 * Service interrupts. If another interrupt arrives while
1539 * we are running, it will set it_need to note that we
1540 * should make another pass.
1542 while (atomic_load_acq_int(&ithd->it_need) != 0) {
1544 * This might need a full read and write barrier
1545 * to make sure that this write posts before any
1546 * of the memory or device accesses in the
1549 atomic_store_rel_int(&ithd->it_need, 0);
1551 priv_ithread_execute_handler(p, ih);
1553 ithread_execute_handlers(p, ie);
1555 WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread");
1556 mtx_assert(&Giant, MA_NOTOWNED);
1559 * Processed all our interrupts. Now get the sched
1560 * lock. This may take a while and it_need may get
1561 * set again, so we have to check it again.
1564 if ((atomic_load_acq_int(&ithd->it_need) == 0) &&
1565 !(ithd->it_flags & (IT_DEAD | IT_WAIT))) {
1568 mi_switch(SW_VOL | SWT_IWAIT, NULL);
1570 if (ithd->it_flags & IT_WAIT) {
1572 ithd->it_flags &= ~IT_WAIT;
1583 * Main loop for interrupt filter.
1585 * Some architectures (i386, amd64 and arm) require the optional frame
1586 * parameter, and use it as the main argument for fast handler execution
1587 * when ih_argument == NULL.
1590 * o FILTER_STRAY: No filter recognized the event, and no
1591 * filter-less handler is registered on this
1593 * o FILTER_HANDLED: A filter claimed the event and served it.
1594 * o FILTER_SCHEDULE_THREAD: No filter claimed the event, but there's at
1595 * least one filter-less handler on this line.
1596 * o FILTER_HANDLED |
1597 * FILTER_SCHEDULE_THREAD: A filter claimed the event, and asked for
1598 * scheduling the per-handler ithread.
1600 * In case an ithread has to be scheduled, in *ithd there will be a
1601 * pointer to a struct intr_thread containing the thread to be
1606 intr_filter_loop(struct intr_event *ie, struct trapframe *frame,
1607 struct intr_thread **ithd)
1609 struct intr_handler *ih;
1611 int ret, thread_only;
1615 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
1617 * Execute fast interrupt handlers directly.
1618 * To support clock handlers, if a handler registers
1619 * with a NULL argument, then we pass it a pointer to
1620 * a trapframe as its argument.
1622 arg = ((ih->ih_argument == NULL) ? frame : ih->ih_argument);
1624 CTR5(KTR_INTR, "%s: exec %p/%p(%p) for %s", __func__,
1625 ih->ih_filter, ih->ih_handler, arg, ih->ih_name);
1627 if (ih->ih_filter != NULL)
1628 ret = ih->ih_filter(arg);
1633 KASSERT(ret == FILTER_STRAY ||
1634 ((ret & (FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) != 0 &&
1635 (ret & ~(FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) == 0),
1636 ("%s: incorrect return value %#x from %s", __func__, ret,
1638 if (ret & FILTER_STRAY)
1641 *ithd = ih->ih_thread;
1647 * No filters handled the interrupt and we have at least
1648 * one handler without a filter. In this case, we schedule
1649 * all of the filter-less handlers to run in the ithread.
1652 *ithd = ie->ie_thread;
1653 return (FILTER_SCHEDULE_THREAD);
1655 return (FILTER_STRAY);
1659 * Main interrupt handling body.
1662 * o ie: the event connected to this interrupt.
1663 * o frame: some archs (i.e. i386) pass a frame to some.
1664 * handlers as their main argument.
1666 * o 0: everything ok.
1667 * o EINVAL: stray interrupt.
1670 intr_event_handle(struct intr_event *ie, struct trapframe *frame)
1672 struct intr_thread *ithd;
1673 struct trapframe *oldframe;
1680 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers))
1683 td->td_intr_nesting_level++;
1686 oldframe = td->td_intr_frame;
1687 td->td_intr_frame = frame;
1688 thread = intr_filter_loop(ie, frame, &ithd);
1689 if (thread & FILTER_HANDLED) {
1690 if (ie->ie_post_filter != NULL)
1691 ie->ie_post_filter(ie->ie_source);
1693 if (ie->ie_pre_ithread != NULL)
1694 ie->ie_pre_ithread(ie->ie_source);
1696 td->td_intr_frame = oldframe;
1699 /* Interrupt storm logic */
1700 if (thread & FILTER_STRAY) {
1702 if (ie->ie_count < intr_storm_threshold)
1703 printf("Interrupt stray detection not present\n");
1706 /* Schedule an ithread if needed. */
1707 if (thread & FILTER_SCHEDULE_THREAD) {
1708 if (intr_event_schedule_thread(ie, ithd) != 0)
1709 panic("%s: impossible stray interrupt", __func__);
1711 td->td_intr_nesting_level--;
1718 * Dump details about an interrupt handler
1721 db_dump_intrhand(struct intr_handler *ih)
1725 db_printf("\t%-10s ", ih->ih_name);
1726 switch (ih->ih_pri) {
1746 if (ih->ih_pri >= PI_SOFT)
1749 db_printf("%4u", ih->ih_pri);
1753 if (ih->ih_filter != NULL) {
1755 db_printsym((uintptr_t)ih->ih_filter, DB_STGY_PROC);
1757 if (ih->ih_handler != NULL) {
1758 if (ih->ih_filter != NULL)
1761 db_printsym((uintptr_t)ih->ih_handler, DB_STGY_PROC);
1763 db_printf("(%p)", ih->ih_argument);
1765 (ih->ih_flags & (IH_EXCLUSIVE | IH_ENTROPY | IH_DEAD |
1769 if (ih->ih_flags & IH_EXCLUSIVE) {
1775 if (ih->ih_flags & IH_ENTROPY) {
1778 db_printf("ENTROPY");
1781 if (ih->ih_flags & IH_DEAD) {
1787 if (ih->ih_flags & IH_MPSAFE) {
1790 db_printf("MPSAFE");
1804 * Dump details about a event.
1807 db_dump_intr_event(struct intr_event *ie, int handlers)
1809 struct intr_handler *ih;
1810 struct intr_thread *it;
1813 db_printf("%s ", ie->ie_fullname);
1816 db_printf("(pid %d)", it->it_thread->td_proc->p_pid);
1818 db_printf("(no thread)");
1819 if ((ie->ie_flags & (IE_SOFT | IE_ENTROPY | IE_ADDING_THREAD)) != 0 ||
1820 (it != NULL && it->it_need)) {
1823 if (ie->ie_flags & IE_SOFT) {
1827 if (ie->ie_flags & IE_ENTROPY) {
1830 db_printf("ENTROPY");
1833 if (ie->ie_flags & IE_ADDING_THREAD) {
1836 db_printf("ADDING_THREAD");
1839 if (it != NULL && it->it_need) {
1849 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next)
1850 db_dump_intrhand(ih);
1854 * Dump data about interrupt handlers
1856 DB_SHOW_COMMAND(intr, db_show_intr)
1858 struct intr_event *ie;
1861 verbose = index(modif, 'v') != NULL;
1862 all = index(modif, 'a') != NULL;
1863 TAILQ_FOREACH(ie, &event_list, ie_list) {
1864 if (!all && TAILQ_EMPTY(&ie->ie_handlers))
1866 db_dump_intr_event(ie, verbose);
1874 * Start standard software interrupt threads
1877 start_softintr(void *dummy)
1880 if (swi_add(NULL, "vm", swi_vm, NULL, SWI_VM, INTR_MPSAFE, &vm_ih))
1881 panic("died while creating vm swi ithread");
1883 SYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr,
1887 * Sysctls used by systat and others: hw.intrnames and hw.intrcnt.
1888 * The data for this machine dependent, and the declarations are in machine
1889 * dependent code. The layout of intrnames and intrcnt however is machine
1892 * We do not know the length of intrcnt and intrnames at compile time, so
1893 * calculate things at run time.
1896 sysctl_intrnames(SYSCTL_HANDLER_ARGS)
1898 return (sysctl_handle_opaque(oidp, intrnames, sintrnames, req));
1901 SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD,
1902 NULL, 0, sysctl_intrnames, "", "Interrupt Names");
1905 sysctl_intrcnt(SYSCTL_HANDLER_ARGS)
1907 return (sysctl_handle_opaque(oidp, intrcnt, sintrcnt, req));
1910 SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD,
1911 NULL, 0, sysctl_intrcnt, "", "Interrupt Counts");
1915 * DDB command to dump the interrupt statistics.
1917 DB_SHOW_COMMAND(intrcnt, db_show_intrcnt)
1925 for (i = intrcnt; j < (sintrcnt / sizeof(u_long)) && !db_pager_quit;
1930 db_printf("%s\t%lu\n", cp, *i);
1931 cp += strlen(cp) + 1;