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("$FreeBSD$");
31 #include "opt_kstack_usage_prof.h"
33 #include <sys/param.h>
36 #include <sys/cpuset.h>
37 #include <sys/rtprio.h>
38 #include <sys/systm.h>
39 #include <sys/interrupt.h>
40 #include <sys/kernel.h>
41 #include <sys/kthread.h>
43 #include <sys/limits.h>
45 #include <sys/malloc.h>
46 #include <sys/mutex.h>
49 #include <sys/random.h>
50 #include <sys/resourcevar.h>
51 #include <sys/sched.h>
53 #include <sys/sysctl.h>
54 #include <sys/syslog.h>
55 #include <sys/unistd.h>
56 #include <sys/vmmeter.h>
57 #include <machine/atomic.h>
58 #include <machine/cpu.h>
59 #include <machine/md_var.h>
60 #include <machine/stdarg.h>
63 #include <ddb/db_sym.h>
67 * Describe an interrupt thread. There is one of these per interrupt event.
70 struct intr_event *it_event;
71 struct thread *it_thread; /* Kernel thread. */
72 int it_flags; /* (j) IT_* flags. */
73 int it_need; /* Needs service. */
76 /* Interrupt thread flags kept in it_flags */
77 #define IT_DEAD 0x000001 /* Thread is waiting to exit. */
78 #define IT_WAIT 0x000002 /* Thread is waiting for completion. */
85 struct intr_event *clk_intr_event;
86 struct intr_event *tty_intr_event;
88 struct proc *intrproc;
90 static MALLOC_DEFINE(M_ITHREAD, "ithread", "Interrupt Threads");
92 static int intr_storm_threshold = 1000;
93 SYSCTL_INT(_hw, OID_AUTO, intr_storm_threshold, CTLFLAG_RWTUN,
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 *, int),
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, int cpu)
301 /* Need a CPU to bind to. */
302 if (cpu != NOCPU && CPU_ABSENT(cpu))
305 if (ie->ie_assign_cpu == NULL)
308 error = priv_check(curthread, PRIV_SCHED_CPUSET_INTR);
313 * If we have any ithreads try to set their mask first to verify
316 mtx_lock(&ie->ie_lock);
317 if (ie->ie_thread != NULL) {
318 id = ie->ie_thread->it_thread->td_tid;
319 mtx_unlock(&ie->ie_lock);
320 error = cpuset_setithread(id, cpu);
324 mtx_unlock(&ie->ie_lock);
325 error = ie->ie_assign_cpu(ie->ie_source, cpu);
327 mtx_lock(&ie->ie_lock);
328 if (ie->ie_thread != NULL) {
330 id = ie->ie_thread->it_thread->td_tid;
331 mtx_unlock(&ie->ie_lock);
332 (void)cpuset_setithread(id, cpu);
334 mtx_unlock(&ie->ie_lock);
338 mtx_lock(&ie->ie_lock);
340 mtx_unlock(&ie->ie_lock);
345 static struct intr_event *
348 struct intr_event *ie;
350 mtx_lock(&event_lock);
351 TAILQ_FOREACH(ie, &event_list, ie_list)
352 if (ie->ie_irq == irq &&
353 (ie->ie_flags & IE_SOFT) == 0 &&
354 TAILQ_FIRST(&ie->ie_handlers) != NULL)
356 mtx_unlock(&event_lock);
361 intr_setaffinity(int irq, void *m)
363 struct intr_event *ie;
370 * If we're setting all cpus we can unbind. Otherwise make sure
371 * only one cpu is in the set.
373 if (CPU_CMP(cpuset_root, mask)) {
374 for (n = 0; n < CPU_SETSIZE; n++) {
375 if (!CPU_ISSET(n, mask))
382 ie = intr_lookup(irq);
385 return (intr_event_bind(ie, cpu));
389 intr_getaffinity(int irq, void *m)
391 struct intr_event *ie;
395 ie = intr_lookup(irq);
399 mtx_lock(&ie->ie_lock);
400 if (ie->ie_cpu == NOCPU)
401 CPU_COPY(cpuset_root, mask);
403 CPU_SET(ie->ie_cpu, mask);
404 mtx_unlock(&ie->ie_lock);
409 intr_event_destroy(struct intr_event *ie)
412 mtx_lock(&event_lock);
413 mtx_lock(&ie->ie_lock);
414 if (!TAILQ_EMPTY(&ie->ie_handlers)) {
415 mtx_unlock(&ie->ie_lock);
416 mtx_unlock(&event_lock);
419 TAILQ_REMOVE(&event_list, ie, ie_list);
421 if (ie->ie_thread != NULL) {
422 ithread_destroy(ie->ie_thread);
423 ie->ie_thread = NULL;
426 mtx_unlock(&ie->ie_lock);
427 mtx_unlock(&event_lock);
428 mtx_destroy(&ie->ie_lock);
434 static struct intr_thread *
435 ithread_create(const char *name)
437 struct intr_thread *ithd;
441 ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO);
443 error = kproc_kthread_add(ithread_loop, ithd, &intrproc,
444 &td, RFSTOPPED | RFHIGHPID,
445 0, "intr", "%s", name);
447 panic("kproc_create() failed with %d", error);
449 sched_class(td, PRI_ITHD);
452 td->td_pflags |= TDP_ITHREAD;
453 ithd->it_thread = td;
454 CTR2(KTR_INTR, "%s: created %s", __func__, name);
458 static struct intr_thread *
459 ithread_create(const char *name, struct intr_handler *ih)
461 struct intr_thread *ithd;
465 ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO);
467 error = kproc_kthread_add(ithread_loop, ih, &intrproc,
468 &td, RFSTOPPED | RFHIGHPID,
469 0, "intr", "%s", name);
471 panic("kproc_create() failed with %d", error);
473 sched_class(td, PRI_ITHD);
476 td->td_pflags |= TDP_ITHREAD;
477 ithd->it_thread = td;
478 CTR2(KTR_INTR, "%s: created %s", __func__, name);
484 ithread_destroy(struct intr_thread *ithread)
488 CTR2(KTR_INTR, "%s: killing %s", __func__, ithread->it_event->ie_name);
489 td = ithread->it_thread;
491 ithread->it_flags |= IT_DEAD;
492 if (TD_AWAITING_INTR(td)) {
494 sched_add(td, SRQ_INTR);
501 intr_event_add_handler(struct intr_event *ie, const char *name,
502 driver_filter_t filter, driver_intr_t handler, void *arg, u_char pri,
503 enum intr_type flags, void **cookiep)
505 struct intr_handler *ih, *temp_ih;
506 struct intr_thread *it;
508 if (ie == NULL || name == NULL || (handler == NULL && filter == NULL))
511 /* Allocate and populate an interrupt handler structure. */
512 ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO);
513 ih->ih_filter = filter;
514 ih->ih_handler = handler;
515 ih->ih_argument = arg;
516 strlcpy(ih->ih_name, name, sizeof(ih->ih_name));
519 if (flags & INTR_EXCL)
520 ih->ih_flags = IH_EXCLUSIVE;
521 if (flags & INTR_MPSAFE)
522 ih->ih_flags |= IH_MPSAFE;
523 if (flags & INTR_ENTROPY)
524 ih->ih_flags |= IH_ENTROPY;
526 /* We can only have one exclusive handler in a event. */
527 mtx_lock(&ie->ie_lock);
528 if (!TAILQ_EMPTY(&ie->ie_handlers)) {
529 if ((flags & INTR_EXCL) ||
530 (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) {
531 mtx_unlock(&ie->ie_lock);
537 /* Create a thread if we need one. */
538 while (ie->ie_thread == NULL && handler != NULL) {
539 if (ie->ie_flags & IE_ADDING_THREAD)
540 msleep(ie, &ie->ie_lock, 0, "ithread", 0);
542 ie->ie_flags |= IE_ADDING_THREAD;
543 mtx_unlock(&ie->ie_lock);
544 it = ithread_create("intr: newborn");
545 mtx_lock(&ie->ie_lock);
546 ie->ie_flags &= ~IE_ADDING_THREAD;
554 /* Add the new handler to the event in priority order. */
555 TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) {
556 if (temp_ih->ih_pri > ih->ih_pri)
560 TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next);
562 TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next);
563 intr_event_update(ie);
565 CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name,
567 mtx_unlock(&ie->ie_lock);
575 intr_event_add_handler(struct intr_event *ie, const char *name,
576 driver_filter_t filter, driver_intr_t handler, void *arg, u_char pri,
577 enum intr_type flags, void **cookiep)
579 struct intr_handler *ih, *temp_ih;
580 struct intr_thread *it;
582 if (ie == NULL || name == NULL || (handler == NULL && filter == NULL))
585 /* Allocate and populate an interrupt handler structure. */
586 ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO);
587 ih->ih_filter = filter;
588 ih->ih_handler = handler;
589 ih->ih_argument = arg;
590 strlcpy(ih->ih_name, name, sizeof(ih->ih_name));
593 if (flags & INTR_EXCL)
594 ih->ih_flags = IH_EXCLUSIVE;
595 if (flags & INTR_MPSAFE)
596 ih->ih_flags |= IH_MPSAFE;
597 if (flags & INTR_ENTROPY)
598 ih->ih_flags |= IH_ENTROPY;
600 /* We can only have one exclusive handler in a event. */
601 mtx_lock(&ie->ie_lock);
602 if (!TAILQ_EMPTY(&ie->ie_handlers)) {
603 if ((flags & INTR_EXCL) ||
604 (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) {
605 mtx_unlock(&ie->ie_lock);
611 /* For filtered handlers, create a private ithread to run on. */
612 if (filter != NULL && handler != NULL) {
613 mtx_unlock(&ie->ie_lock);
614 it = ithread_create("intr: newborn", ih);
615 mtx_lock(&ie->ie_lock);
618 ithread_update(it); /* XXX - do we really need this?!?!? */
619 } else { /* Create the global per-event thread if we need one. */
620 while (ie->ie_thread == NULL && handler != NULL) {
621 if (ie->ie_flags & IE_ADDING_THREAD)
622 msleep(ie, &ie->ie_lock, 0, "ithread", 0);
624 ie->ie_flags |= IE_ADDING_THREAD;
625 mtx_unlock(&ie->ie_lock);
626 it = ithread_create("intr: newborn", ih);
627 mtx_lock(&ie->ie_lock);
628 ie->ie_flags &= ~IE_ADDING_THREAD;
637 /* Add the new handler to the event in priority order. */
638 TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) {
639 if (temp_ih->ih_pri > ih->ih_pri)
643 TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next);
645 TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next);
646 intr_event_update(ie);
648 CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name,
650 mtx_unlock(&ie->ie_lock);
659 * Append a description preceded by a ':' to the name of the specified
663 intr_event_describe_handler(struct intr_event *ie, void *cookie,
666 struct intr_handler *ih;
670 mtx_lock(&ie->ie_lock);
672 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
677 mtx_unlock(&ie->ie_lock);
678 panic("handler %p not found in interrupt event %p", cookie, ie);
684 * Look for an existing description by checking for an
685 * existing ":". This assumes device names do not include
686 * colons. If one is found, prepare to insert the new
687 * description at that point. If one is not found, find the
688 * end of the name to use as the insertion point.
690 start = strchr(ih->ih_name, ':');
692 start = strchr(ih->ih_name, 0);
695 * See if there is enough remaining room in the string for the
696 * description + ":". The "- 1" leaves room for the trailing
697 * '\0'. The "+ 1" accounts for the colon.
699 space = sizeof(ih->ih_name) - (start - ih->ih_name) - 1;
700 if (strlen(descr) + 1 > space) {
701 mtx_unlock(&ie->ie_lock);
705 /* Append a colon followed by the description. */
707 strcpy(start + 1, descr);
708 intr_event_update(ie);
709 mtx_unlock(&ie->ie_lock);
714 * Return the ie_source field from the intr_event an intr_handler is
718 intr_handler_source(void *cookie)
720 struct intr_handler *ih;
721 struct intr_event *ie;
723 ih = (struct intr_handler *)cookie;
728 ("interrupt handler \"%s\" has a NULL interrupt event",
730 return (ie->ie_source);
734 * Sleep until an ithread finishes executing an interrupt handler.
736 * XXX Doesn't currently handle interrupt filters or fast interrupt
737 * handlers. This is intended for compatibility with linux drivers
738 * only. Do not use in BSD code.
743 struct intr_event *ie;
744 struct intr_thread *ithd;
747 ie = intr_lookup(irq);
750 if (ie->ie_thread == NULL)
752 ithd = ie->ie_thread;
753 td = ithd->it_thread;
755 * We set the flag and wait for it to be cleared to avoid
756 * long delays with potentially busy interrupt handlers
757 * were we to only sample TD_AWAITING_INTR() every tick.
760 if (!TD_AWAITING_INTR(td)) {
761 ithd->it_flags |= IT_WAIT;
762 while (ithd->it_flags & IT_WAIT) {
775 intr_event_remove_handler(void *cookie)
777 struct intr_handler *handler = (struct intr_handler *)cookie;
778 struct intr_event *ie;
780 struct intr_handler *ih;
788 ie = handler->ih_event;
790 ("interrupt handler \"%s\" has a NULL interrupt event",
792 mtx_lock(&ie->ie_lock);
793 CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name,
796 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next)
799 mtx_unlock(&ie->ie_lock);
800 panic("interrupt handler \"%s\" not found in interrupt event \"%s\"",
801 ih->ih_name, ie->ie_name);
805 * If there is no ithread, then just remove the handler and return.
806 * XXX: Note that an INTR_FAST handler might be running on another
809 if (ie->ie_thread == NULL) {
810 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next);
811 mtx_unlock(&ie->ie_lock);
812 free(handler, M_ITHREAD);
817 * If the interrupt thread is already running, then just mark this
818 * handler as being dead and let the ithread do the actual removal.
820 * During a cold boot while cold is set, msleep() does not sleep,
821 * so we have to remove the handler here rather than letting the
824 thread_lock(ie->ie_thread->it_thread);
825 if (!TD_AWAITING_INTR(ie->ie_thread->it_thread) && !cold) {
826 handler->ih_flags |= IH_DEAD;
829 * Ensure that the thread will process the handler list
830 * again and remove this handler if it has already passed
833 atomic_store_rel_int(&ie->ie_thread->it_need, 1);
835 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next);
836 thread_unlock(ie->ie_thread->it_thread);
837 while (handler->ih_flags & IH_DEAD)
838 msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0);
839 intr_event_update(ie);
842 * XXX: This could be bad in the case of ppbus(8). Also, I think
843 * this could lead to races of stale data when servicing an
847 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
848 if (!(ih->ih_flags & IH_FAST)) {
854 ithread_destroy(ie->ie_thread);
855 ie->ie_thread = NULL;
858 mtx_unlock(&ie->ie_lock);
859 free(handler, M_ITHREAD);
864 intr_event_schedule_thread(struct intr_event *ie)
866 struct intr_entropy entropy;
867 struct intr_thread *it;
873 * If no ithread or no handlers, then we have a stray interrupt.
875 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) ||
876 ie->ie_thread == NULL)
885 * If any of the handlers for this ithread claim to be good
886 * sources of entropy, then gather some.
888 if (ie->ie_flags & IE_ENTROPY) {
889 entropy.event = (uintptr_t)ie;
891 random_harvest(&entropy, sizeof(entropy), 2, RANDOM_INTERRUPT);
894 KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name));
897 * Set it_need to tell the thread to keep running if it is already
898 * running. Then, lock the thread and see if we actually need to
899 * put it on the runqueue.
901 atomic_store_rel_int(&it->it_need, 1);
903 if (TD_AWAITING_INTR(td)) {
904 CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid,
907 sched_add(td, SRQ_INTR);
909 CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d",
910 __func__, p->p_pid, td->td_name, it->it_need, td->td_state);
918 intr_event_remove_handler(void *cookie)
920 struct intr_handler *handler = (struct intr_handler *)cookie;
921 struct intr_event *ie;
922 struct intr_thread *it;
924 struct intr_handler *ih;
932 ie = handler->ih_event;
934 ("interrupt handler \"%s\" has a NULL interrupt event",
936 mtx_lock(&ie->ie_lock);
937 CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name,
940 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next)
943 mtx_unlock(&ie->ie_lock);
944 panic("interrupt handler \"%s\" not found in interrupt event \"%s\"",
945 ih->ih_name, ie->ie_name);
949 * If there are no ithreads (per event and per handler), then
950 * just remove the handler and return.
951 * XXX: Note that an INTR_FAST handler might be running on another CPU!
953 if (ie->ie_thread == NULL && handler->ih_thread == NULL) {
954 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next);
955 mtx_unlock(&ie->ie_lock);
956 free(handler, M_ITHREAD);
960 /* Private or global ithread? */
961 it = (handler->ih_thread) ? handler->ih_thread : ie->ie_thread;
963 * If the interrupt thread is already running, then just mark this
964 * handler as being dead and let the ithread do the actual removal.
966 * During a cold boot while cold is set, msleep() does not sleep,
967 * so we have to remove the handler here rather than letting the
970 thread_lock(it->it_thread);
971 if (!TD_AWAITING_INTR(it->it_thread) && !cold) {
972 handler->ih_flags |= IH_DEAD;
975 * Ensure that the thread will process the handler list
976 * again and remove this handler if it has already passed
979 atomic_store_rel_int(&it->it_need, 1);
981 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next);
982 thread_unlock(it->it_thread);
983 while (handler->ih_flags & IH_DEAD)
984 msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0);
986 * At this point, the handler has been disconnected from the event,
987 * so we can kill the private ithread if any.
989 if (handler->ih_thread) {
990 ithread_destroy(handler->ih_thread);
991 handler->ih_thread = NULL;
993 intr_event_update(ie);
996 * XXX: This could be bad in the case of ppbus(8). Also, I think
997 * this could lead to races of stale data when servicing an
1001 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
1002 if (handler != NULL) {
1008 ithread_destroy(ie->ie_thread);
1009 ie->ie_thread = NULL;
1012 mtx_unlock(&ie->ie_lock);
1013 free(handler, M_ITHREAD);
1018 intr_event_schedule_thread(struct intr_event *ie, struct intr_thread *it)
1020 struct intr_entropy entropy;
1026 * If no ithread or no handlers, then we have a stray interrupt.
1028 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) || it == NULL)
1036 * If any of the handlers for this ithread claim to be good
1037 * sources of entropy, then gather some.
1039 if (ie->ie_flags & IE_ENTROPY) {
1040 entropy.event = (uintptr_t)ie;
1042 random_harvest(&entropy, sizeof(entropy), 2, RANDOM_INTERRUPT);
1045 KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name));
1048 * Set it_need to tell the thread to keep running if it is already
1049 * running. Then, lock the thread and see if we actually need to
1050 * put it on the runqueue.
1052 atomic_store_rel_int(&it->it_need, 1);
1054 if (TD_AWAITING_INTR(td)) {
1055 CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid,
1058 sched_add(td, SRQ_INTR);
1060 CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d",
1061 __func__, p->p_pid, td->td_name, it->it_need, td->td_state);
1070 * Allow interrupt event binding for software interrupt handlers -- a no-op,
1071 * since interrupts are generated in software rather than being directed by
1075 swi_assign_cpu(void *arg, int cpu)
1082 * Add a software interrupt handler to a specified event. If a given event
1083 * is not specified, then a new event is created.
1086 swi_add(struct intr_event **eventp, const char *name, driver_intr_t handler,
1087 void *arg, int pri, enum intr_type flags, void **cookiep)
1089 struct intr_event *ie;
1092 if (flags & INTR_ENTROPY)
1095 ie = (eventp != NULL) ? *eventp : NULL;
1098 if (!(ie->ie_flags & IE_SOFT))
1101 error = intr_event_create(&ie, NULL, IE_SOFT, 0,
1102 NULL, NULL, NULL, swi_assign_cpu, "swi%d:", pri);
1108 error = intr_event_add_handler(ie, name, NULL, handler, arg,
1109 PI_SWI(pri), flags, cookiep);
1114 * Schedule a software interrupt thread.
1117 swi_sched(void *cookie, int flags)
1119 struct intr_handler *ih = (struct intr_handler *)cookie;
1120 struct intr_event *ie = ih->ih_event;
1121 struct intr_entropy entropy;
1124 CTR3(KTR_INTR, "swi_sched: %s %s need=%d", ie->ie_name, ih->ih_name,
1127 entropy.event = (uintptr_t)ih;
1128 entropy.td = curthread;
1129 random_harvest(&entropy, sizeof(entropy), 1, RANDOM_SWI);
1132 * Set ih_need for this handler so that if the ithread is already
1133 * running it will execute this handler on the next pass. Otherwise,
1134 * it will execute it the next time it runs.
1136 atomic_store_rel_int(&ih->ih_need, 1);
1138 if (!(flags & SWI_DELAY)) {
1139 PCPU_INC(cnt.v_soft);
1141 error = intr_event_schedule_thread(ie, ie->ie_thread);
1143 error = intr_event_schedule_thread(ie);
1145 KASSERT(error == 0, ("stray software interrupt"));
1150 * Remove a software interrupt handler. Currently this code does not
1151 * remove the associated interrupt event if it becomes empty. Calling code
1152 * may do so manually via intr_event_destroy(), but that's not really
1153 * an optimal interface.
1156 swi_remove(void *cookie)
1159 return (intr_event_remove_handler(cookie));
1164 priv_ithread_execute_handler(struct proc *p, struct intr_handler *ih)
1166 struct intr_event *ie;
1170 * If this handler is marked for death, remove it from
1171 * the list of handlers and wake up the sleeper.
1173 if (ih->ih_flags & IH_DEAD) {
1174 mtx_lock(&ie->ie_lock);
1175 TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next);
1176 ih->ih_flags &= ~IH_DEAD;
1178 mtx_unlock(&ie->ie_lock);
1182 /* Execute this handler. */
1183 CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x",
1184 __func__, p->p_pid, (void *)ih->ih_handler, ih->ih_argument,
1185 ih->ih_name, ih->ih_flags);
1187 if (!(ih->ih_flags & IH_MPSAFE))
1189 ih->ih_handler(ih->ih_argument);
1190 if (!(ih->ih_flags & IH_MPSAFE))
1196 * This is a public function for use by drivers that mux interrupt
1197 * handlers for child devices from their interrupt handler.
1200 intr_event_execute_handlers(struct proc *p, struct intr_event *ie)
1202 struct intr_handler *ih, *ihn;
1204 TAILQ_FOREACH_SAFE(ih, &ie->ie_handlers, ih_next, ihn) {
1206 * If this handler is marked for death, remove it from
1207 * the list of handlers and wake up the sleeper.
1209 if (ih->ih_flags & IH_DEAD) {
1210 mtx_lock(&ie->ie_lock);
1211 TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next);
1212 ih->ih_flags &= ~IH_DEAD;
1214 mtx_unlock(&ie->ie_lock);
1218 /* Skip filter only handlers */
1219 if (ih->ih_handler == NULL)
1223 * For software interrupt threads, we only execute
1224 * handlers that have their need flag set. Hardware
1225 * interrupt threads always invoke all of their handlers.
1227 if (ie->ie_flags & IE_SOFT) {
1228 if (atomic_load_acq_int(&ih->ih_need) == 0)
1231 atomic_store_rel_int(&ih->ih_need, 0);
1234 /* Execute this handler. */
1235 CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x",
1236 __func__, p->p_pid, (void *)ih->ih_handler,
1237 ih->ih_argument, ih->ih_name, ih->ih_flags);
1239 if (!(ih->ih_flags & IH_MPSAFE))
1241 ih->ih_handler(ih->ih_argument);
1242 if (!(ih->ih_flags & IH_MPSAFE))
1248 ithread_execute_handlers(struct proc *p, struct intr_event *ie)
1251 /* Interrupt handlers should not sleep. */
1252 if (!(ie->ie_flags & IE_SOFT))
1253 THREAD_NO_SLEEPING();
1254 intr_event_execute_handlers(p, ie);
1255 if (!(ie->ie_flags & IE_SOFT))
1256 THREAD_SLEEPING_OK();
1259 * Interrupt storm handling:
1261 * If this interrupt source is currently storming, then throttle
1262 * it to only fire the handler once per clock tick.
1264 * If this interrupt source is not currently storming, but the
1265 * number of back to back interrupts exceeds the storm threshold,
1266 * then enter storming mode.
1268 if (intr_storm_threshold != 0 && ie->ie_count >= intr_storm_threshold &&
1269 !(ie->ie_flags & IE_SOFT)) {
1270 /* Report the message only once every second. */
1271 if (ppsratecheck(&ie->ie_warntm, &ie->ie_warncnt, 1)) {
1273 "interrupt storm detected on \"%s\"; throttling interrupt source\n",
1281 * Now that all the handlers have had a chance to run, reenable
1282 * the interrupt source.
1284 if (ie->ie_post_ithread != NULL)
1285 ie->ie_post_ithread(ie->ie_source);
1290 * This is the main code for interrupt threads.
1293 ithread_loop(void *arg)
1295 struct intr_thread *ithd;
1296 struct intr_event *ie;
1303 ithd = (struct intr_thread *)arg;
1304 KASSERT(ithd->it_thread == td,
1305 ("%s: ithread and proc linkage out of sync", __func__));
1306 ie = ithd->it_event;
1311 * As long as we have interrupts outstanding, go through the
1312 * list of handlers, giving each one a go at it.
1316 * If we are an orphaned thread, then just die.
1318 if (ithd->it_flags & IT_DEAD) {
1319 CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__,
1320 p->p_pid, td->td_name);
1321 free(ithd, M_ITHREAD);
1326 * Service interrupts. If another interrupt arrives while
1327 * we are running, it will set it_need to note that we
1328 * should make another pass.
1330 while (atomic_load_acq_int(&ithd->it_need) != 0) {
1332 * This might need a full read and write barrier
1333 * to make sure that this write posts before any
1334 * of the memory or device accesses in the
1337 atomic_store_rel_int(&ithd->it_need, 0);
1338 ithread_execute_handlers(p, ie);
1340 WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread");
1341 mtx_assert(&Giant, MA_NOTOWNED);
1344 * Processed all our interrupts. Now get the sched
1345 * lock. This may take a while and it_need may get
1346 * set again, so we have to check it again.
1349 if ((atomic_load_acq_int(&ithd->it_need) == 0) &&
1350 !(ithd->it_flags & (IT_DEAD | IT_WAIT))) {
1353 mi_switch(SW_VOL | SWT_IWAIT, NULL);
1355 if (ithd->it_flags & IT_WAIT) {
1357 ithd->it_flags &= ~IT_WAIT;
1368 * Main interrupt handling body.
1371 * o ie: the event connected to this interrupt.
1372 * o frame: some archs (i.e. i386) pass a frame to some.
1373 * handlers as their main argument.
1375 * o 0: everything ok.
1376 * o EINVAL: stray interrupt.
1379 intr_event_handle(struct intr_event *ie, struct trapframe *frame)
1381 struct intr_handler *ih;
1382 struct trapframe *oldframe;
1384 int error, ret, thread;
1388 #ifdef KSTACK_USAGE_PROF
1389 intr_prof_stack_use(td, frame);
1392 /* An interrupt with no event or handlers is a stray interrupt. */
1393 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers))
1397 * Execute fast interrupt handlers directly.
1398 * To support clock handlers, if a handler registers
1399 * with a NULL argument, then we pass it a pointer to
1400 * a trapframe as its argument.
1402 td->td_intr_nesting_level++;
1406 oldframe = td->td_intr_frame;
1407 td->td_intr_frame = frame;
1408 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
1409 if (ih->ih_filter == NULL) {
1413 CTR4(KTR_INTR, "%s: exec %p(%p) for %s", __func__,
1414 ih->ih_filter, ih->ih_argument == NULL ? frame :
1415 ih->ih_argument, ih->ih_name);
1416 if (ih->ih_argument == NULL)
1417 ret = ih->ih_filter(frame);
1419 ret = ih->ih_filter(ih->ih_argument);
1420 KASSERT(ret == FILTER_STRAY ||
1421 ((ret & (FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) != 0 &&
1422 (ret & ~(FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) == 0),
1423 ("%s: incorrect return value %#x from %s", __func__, ret,
1427 * Wrapper handler special handling:
1429 * in some particular cases (like pccard and pccbb),
1430 * the _real_ device handler is wrapped in a couple of
1431 * functions - a filter wrapper and an ithread wrapper.
1432 * In this case (and just in this case), the filter wrapper
1433 * could ask the system to schedule the ithread and mask
1434 * the interrupt source if the wrapped handler is composed
1435 * of just an ithread handler.
1437 * TODO: write a generic wrapper to avoid people rolling
1441 if (ret == FILTER_SCHEDULE_THREAD)
1445 td->td_intr_frame = oldframe;
1448 if (ie->ie_pre_ithread != NULL)
1449 ie->ie_pre_ithread(ie->ie_source);
1451 if (ie->ie_post_filter != NULL)
1452 ie->ie_post_filter(ie->ie_source);
1455 /* Schedule the ithread if needed. */
1457 error = intr_event_schedule_thread(ie);
1459 KASSERT(error == 0, ("bad stray interrupt"));
1462 log(LOG_WARNING, "bad stray interrupt");
1466 td->td_intr_nesting_level--;
1471 * This is the main code for interrupt threads.
1474 ithread_loop(void *arg)
1476 struct intr_thread *ithd;
1477 struct intr_handler *ih;
1478 struct intr_event *ie;
1486 ih = (struct intr_handler *)arg;
1487 priv = (ih->ih_thread != NULL) ? 1 : 0;
1488 ithd = (priv) ? ih->ih_thread : ih->ih_event->ie_thread;
1489 KASSERT(ithd->it_thread == td,
1490 ("%s: ithread and proc linkage out of sync", __func__));
1491 ie = ithd->it_event;
1496 * As long as we have interrupts outstanding, go through the
1497 * list of handlers, giving each one a go at it.
1501 * If we are an orphaned thread, then just die.
1503 if (ithd->it_flags & IT_DEAD) {
1504 CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__,
1505 p->p_pid, td->td_name);
1506 free(ithd, M_ITHREAD);
1511 * Service interrupts. If another interrupt arrives while
1512 * we are running, it will set it_need to note that we
1513 * should make another pass.
1515 while (atomic_load_acq_int(&ithd->it_need) != 0) {
1517 * This might need a full read and write barrier
1518 * to make sure that this write posts before any
1519 * of the memory or device accesses in the
1522 atomic_store_rel_int(&ithd->it_need, 0);
1524 priv_ithread_execute_handler(p, ih);
1526 ithread_execute_handlers(p, ie);
1528 WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread");
1529 mtx_assert(&Giant, MA_NOTOWNED);
1532 * Processed all our interrupts. Now get the sched
1533 * lock. This may take a while and it_need may get
1534 * set again, so we have to check it again.
1537 if ((atomic_load_acq_int(&ithd->it_need) == 0) &&
1538 !(ithd->it_flags & (IT_DEAD | IT_WAIT))) {
1541 mi_switch(SW_VOL | SWT_IWAIT, NULL);
1543 if (ithd->it_flags & IT_WAIT) {
1545 ithd->it_flags &= ~IT_WAIT;
1556 * Main loop for interrupt filter.
1558 * Some architectures (i386, amd64 and arm) require the optional frame
1559 * parameter, and use it as the main argument for fast handler execution
1560 * when ih_argument == NULL.
1563 * o FILTER_STRAY: No filter recognized the event, and no
1564 * filter-less handler is registered on this
1566 * o FILTER_HANDLED: A filter claimed the event and served it.
1567 * o FILTER_SCHEDULE_THREAD: No filter claimed the event, but there's at
1568 * least one filter-less handler on this line.
1569 * o FILTER_HANDLED |
1570 * FILTER_SCHEDULE_THREAD: A filter claimed the event, and asked for
1571 * scheduling the per-handler ithread.
1573 * In case an ithread has to be scheduled, in *ithd there will be a
1574 * pointer to a struct intr_thread containing the thread to be
1579 intr_filter_loop(struct intr_event *ie, struct trapframe *frame,
1580 struct intr_thread **ithd)
1582 struct intr_handler *ih;
1584 int ret, thread_only;
1588 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
1590 * Execute fast interrupt handlers directly.
1591 * To support clock handlers, if a handler registers
1592 * with a NULL argument, then we pass it a pointer to
1593 * a trapframe as its argument.
1595 arg = ((ih->ih_argument == NULL) ? frame : ih->ih_argument);
1597 CTR5(KTR_INTR, "%s: exec %p/%p(%p) for %s", __func__,
1598 ih->ih_filter, ih->ih_handler, arg, ih->ih_name);
1600 if (ih->ih_filter != NULL)
1601 ret = ih->ih_filter(arg);
1606 KASSERT(ret == FILTER_STRAY ||
1607 ((ret & (FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) != 0 &&
1608 (ret & ~(FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) == 0),
1609 ("%s: incorrect return value %#x from %s", __func__, ret,
1611 if (ret & FILTER_STRAY)
1614 *ithd = ih->ih_thread;
1620 * No filters handled the interrupt and we have at least
1621 * one handler without a filter. In this case, we schedule
1622 * all of the filter-less handlers to run in the ithread.
1625 *ithd = ie->ie_thread;
1626 return (FILTER_SCHEDULE_THREAD);
1628 return (FILTER_STRAY);
1632 * Main interrupt handling body.
1635 * o ie: the event connected to this interrupt.
1636 * o frame: some archs (i.e. i386) pass a frame to some.
1637 * handlers as their main argument.
1639 * o 0: everything ok.
1640 * o EINVAL: stray interrupt.
1643 intr_event_handle(struct intr_event *ie, struct trapframe *frame)
1645 struct intr_thread *ithd;
1646 struct trapframe *oldframe;
1653 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers))
1656 td->td_intr_nesting_level++;
1659 oldframe = td->td_intr_frame;
1660 td->td_intr_frame = frame;
1661 thread = intr_filter_loop(ie, frame, &ithd);
1662 if (thread & FILTER_HANDLED) {
1663 if (ie->ie_post_filter != NULL)
1664 ie->ie_post_filter(ie->ie_source);
1666 if (ie->ie_pre_ithread != NULL)
1667 ie->ie_pre_ithread(ie->ie_source);
1669 td->td_intr_frame = oldframe;
1672 /* Interrupt storm logic */
1673 if (thread & FILTER_STRAY) {
1675 if (ie->ie_count < intr_storm_threshold)
1676 printf("Interrupt stray detection not present\n");
1679 /* Schedule an ithread if needed. */
1680 if (thread & FILTER_SCHEDULE_THREAD) {
1681 if (intr_event_schedule_thread(ie, ithd) != 0)
1682 panic("%s: impossible stray interrupt", __func__);
1684 td->td_intr_nesting_level--;
1691 * Dump details about an interrupt handler
1694 db_dump_intrhand(struct intr_handler *ih)
1698 db_printf("\t%-10s ", ih->ih_name);
1699 switch (ih->ih_pri) {
1719 if (ih->ih_pri >= PI_SOFT)
1722 db_printf("%4u", ih->ih_pri);
1726 if (ih->ih_filter != NULL) {
1728 db_printsym((uintptr_t)ih->ih_filter, DB_STGY_PROC);
1730 if (ih->ih_handler != NULL) {
1731 if (ih->ih_filter != NULL)
1734 db_printsym((uintptr_t)ih->ih_handler, DB_STGY_PROC);
1736 db_printf("(%p)", ih->ih_argument);
1738 (ih->ih_flags & (IH_EXCLUSIVE | IH_ENTROPY | IH_DEAD |
1742 if (ih->ih_flags & IH_EXCLUSIVE) {
1748 if (ih->ih_flags & IH_ENTROPY) {
1751 db_printf("ENTROPY");
1754 if (ih->ih_flags & IH_DEAD) {
1760 if (ih->ih_flags & IH_MPSAFE) {
1763 db_printf("MPSAFE");
1777 * Dump details about a event.
1780 db_dump_intr_event(struct intr_event *ie, int handlers)
1782 struct intr_handler *ih;
1783 struct intr_thread *it;
1786 db_printf("%s ", ie->ie_fullname);
1789 db_printf("(pid %d)", it->it_thread->td_proc->p_pid);
1791 db_printf("(no thread)");
1792 if ((ie->ie_flags & (IE_SOFT | IE_ENTROPY | IE_ADDING_THREAD)) != 0 ||
1793 (it != NULL && it->it_need)) {
1796 if (ie->ie_flags & IE_SOFT) {
1800 if (ie->ie_flags & IE_ENTROPY) {
1803 db_printf("ENTROPY");
1806 if (ie->ie_flags & IE_ADDING_THREAD) {
1809 db_printf("ADDING_THREAD");
1812 if (it != NULL && it->it_need) {
1822 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next)
1823 db_dump_intrhand(ih);
1827 * Dump data about interrupt handlers
1829 DB_SHOW_COMMAND(intr, db_show_intr)
1831 struct intr_event *ie;
1834 verbose = strchr(modif, 'v') != NULL;
1835 all = strchr(modif, 'a') != NULL;
1836 TAILQ_FOREACH(ie, &event_list, ie_list) {
1837 if (!all && TAILQ_EMPTY(&ie->ie_handlers))
1839 db_dump_intr_event(ie, verbose);
1847 * Start standard software interrupt threads
1850 start_softintr(void *dummy)
1853 if (swi_add(NULL, "vm", swi_vm, NULL, SWI_VM, INTR_MPSAFE, &vm_ih))
1854 panic("died while creating vm swi ithread");
1856 SYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr,
1860 * Sysctls used by systat and others: hw.intrnames and hw.intrcnt.
1861 * The data for this machine dependent, and the declarations are in machine
1862 * dependent code. The layout of intrnames and intrcnt however is machine
1865 * We do not know the length of intrcnt and intrnames at compile time, so
1866 * calculate things at run time.
1869 sysctl_intrnames(SYSCTL_HANDLER_ARGS)
1871 return (sysctl_handle_opaque(oidp, intrnames, sintrnames, req));
1874 SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD,
1875 NULL, 0, sysctl_intrnames, "", "Interrupt Names");
1878 sysctl_intrcnt(SYSCTL_HANDLER_ARGS)
1881 uint32_t *intrcnt32;
1885 if (req->flags & SCTL_MASK32) {
1887 return (sysctl_handle_opaque(oidp, NULL, sintrcnt / 2, req));
1888 intrcnt32 = malloc(sintrcnt / 2, M_TEMP, M_NOWAIT);
1889 if (intrcnt32 == NULL)
1891 for (i = 0; i < sintrcnt / sizeof (u_long); i++)
1892 intrcnt32[i] = intrcnt[i];
1893 error = sysctl_handle_opaque(oidp, intrcnt32, sintrcnt / 2, req);
1894 free(intrcnt32, M_TEMP);
1898 return (sysctl_handle_opaque(oidp, intrcnt, sintrcnt, req));
1901 SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD,
1902 NULL, 0, sysctl_intrcnt, "", "Interrupt Counts");
1906 * DDB command to dump the interrupt statistics.
1908 DB_SHOW_COMMAND(intrcnt, db_show_intrcnt)
1916 for (i = intrcnt; j < (sintrcnt / sizeof(u_long)) && !db_pager_quit;
1921 db_printf("%s\t%lu\n", cp, *i);
1922 cp += strlen(cp) + 1;