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. Using a cpu id of NOCPU unbinds
291 * the interrupt event.
294 _intr_event_bind(struct intr_event *ie, int cpu, bool bindirq, bool bindithread)
299 /* Need a CPU to bind to. */
300 if (cpu != NOCPU && CPU_ABSENT(cpu))
303 if (ie->ie_assign_cpu == NULL)
306 error = priv_check(curthread, PRIV_SCHED_CPUSET_INTR);
311 * If we have any ithreads try to set their mask first to verify
315 mtx_lock(&ie->ie_lock);
316 if (ie->ie_thread != NULL) {
317 id = ie->ie_thread->it_thread->td_tid;
318 mtx_unlock(&ie->ie_lock);
319 error = cpuset_setithread(id, cpu);
323 mtx_unlock(&ie->ie_lock);
326 error = ie->ie_assign_cpu(ie->ie_source, cpu);
329 mtx_lock(&ie->ie_lock);
330 if (ie->ie_thread != NULL) {
332 id = ie->ie_thread->it_thread->td_tid;
333 mtx_unlock(&ie->ie_lock);
334 (void)cpuset_setithread(id, cpu);
336 mtx_unlock(&ie->ie_lock);
342 mtx_lock(&ie->ie_lock);
344 mtx_unlock(&ie->ie_lock);
351 * Bind an interrupt event to the specified CPU. For supported platforms, any
352 * associated ithreads as well as the primary interrupt context will be bound
353 * to the specificed CPU.
356 intr_event_bind(struct intr_event *ie, int cpu)
359 return (_intr_event_bind(ie, cpu, true, true));
363 * Bind an interrupt event to the specified CPU, but do not bind associated
367 intr_event_bind_irqonly(struct intr_event *ie, int cpu)
370 return (_intr_event_bind(ie, cpu, true, false));
374 * Bind an interrupt event's ithread to the specified CPU.
377 intr_event_bind_ithread(struct intr_event *ie, int cpu)
380 return (_intr_event_bind(ie, cpu, false, true));
383 static struct intr_event *
386 struct intr_event *ie;
388 mtx_lock(&event_lock);
389 TAILQ_FOREACH(ie, &event_list, ie_list)
390 if (ie->ie_irq == irq &&
391 (ie->ie_flags & IE_SOFT) == 0 &&
392 TAILQ_FIRST(&ie->ie_handlers) != NULL)
394 mtx_unlock(&event_lock);
399 intr_setaffinity(int irq, int mode, void *m)
401 struct intr_event *ie;
408 * If we're setting all cpus we can unbind. Otherwise make sure
409 * only one cpu is in the set.
411 if (CPU_CMP(cpuset_root, mask)) {
412 for (n = 0; n < CPU_SETSIZE; n++) {
413 if (!CPU_ISSET(n, mask))
420 ie = intr_lookup(irq);
425 return (intr_event_bind(ie, cpu));
426 case CPU_WHICH_INTRHANDLER:
427 return (intr_event_bind_irqonly(ie, cpu));
428 case CPU_WHICH_ITHREAD:
429 return (intr_event_bind_ithread(ie, cpu));
436 intr_getaffinity(int irq, int mode, void *m)
438 struct intr_event *ie;
446 ie = intr_lookup(irq);
454 case CPU_WHICH_INTRHANDLER:
455 mtx_lock(&ie->ie_lock);
456 if (ie->ie_cpu == NOCPU)
457 CPU_COPY(cpuset_root, mask);
459 CPU_SET(ie->ie_cpu, mask);
460 mtx_unlock(&ie->ie_lock);
462 case CPU_WHICH_ITHREAD:
463 mtx_lock(&ie->ie_lock);
464 if (ie->ie_thread == NULL) {
465 mtx_unlock(&ie->ie_lock);
466 CPU_COPY(cpuset_root, mask);
468 id = ie->ie_thread->it_thread->td_tid;
469 mtx_unlock(&ie->ie_lock);
470 error = cpuset_which(CPU_WHICH_TID, id, &p, &td, NULL);
473 CPU_COPY(&td->td_cpuset->cs_mask, mask);
483 intr_event_destroy(struct intr_event *ie)
486 mtx_lock(&event_lock);
487 mtx_lock(&ie->ie_lock);
488 if (!TAILQ_EMPTY(&ie->ie_handlers)) {
489 mtx_unlock(&ie->ie_lock);
490 mtx_unlock(&event_lock);
493 TAILQ_REMOVE(&event_list, ie, ie_list);
495 if (ie->ie_thread != NULL) {
496 ithread_destroy(ie->ie_thread);
497 ie->ie_thread = NULL;
500 mtx_unlock(&ie->ie_lock);
501 mtx_unlock(&event_lock);
502 mtx_destroy(&ie->ie_lock);
508 static struct intr_thread *
509 ithread_create(const char *name)
511 struct intr_thread *ithd;
515 ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO);
517 error = kproc_kthread_add(ithread_loop, ithd, &intrproc,
518 &td, RFSTOPPED | RFHIGHPID,
519 0, "intr", "%s", name);
521 panic("kproc_create() failed with %d", error);
523 sched_class(td, PRI_ITHD);
526 td->td_pflags |= TDP_ITHREAD;
527 ithd->it_thread = td;
528 CTR2(KTR_INTR, "%s: created %s", __func__, name);
532 static struct intr_thread *
533 ithread_create(const char *name, struct intr_handler *ih)
535 struct intr_thread *ithd;
539 ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO);
541 error = kproc_kthread_add(ithread_loop, ih, &intrproc,
542 &td, RFSTOPPED | RFHIGHPID,
543 0, "intr", "%s", name);
545 panic("kproc_create() failed with %d", error);
547 sched_class(td, PRI_ITHD);
550 td->td_pflags |= TDP_ITHREAD;
551 ithd->it_thread = td;
552 CTR2(KTR_INTR, "%s: created %s", __func__, name);
558 ithread_destroy(struct intr_thread *ithread)
562 CTR2(KTR_INTR, "%s: killing %s", __func__, ithread->it_event->ie_name);
563 td = ithread->it_thread;
565 ithread->it_flags |= IT_DEAD;
566 if (TD_AWAITING_INTR(td)) {
568 sched_add(td, SRQ_INTR);
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 /* Create a thread if we need one. */
612 while (ie->ie_thread == NULL && handler != NULL) {
613 if (ie->ie_flags & IE_ADDING_THREAD)
614 msleep(ie, &ie->ie_lock, 0, "ithread", 0);
616 ie->ie_flags |= IE_ADDING_THREAD;
617 mtx_unlock(&ie->ie_lock);
618 it = ithread_create("intr: newborn");
619 mtx_lock(&ie->ie_lock);
620 ie->ie_flags &= ~IE_ADDING_THREAD;
628 /* Add the new handler to the event in priority order. */
629 TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) {
630 if (temp_ih->ih_pri > ih->ih_pri)
634 TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next);
636 TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next);
637 intr_event_update(ie);
639 CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name,
641 mtx_unlock(&ie->ie_lock);
649 intr_event_add_handler(struct intr_event *ie, const char *name,
650 driver_filter_t filter, driver_intr_t handler, void *arg, u_char pri,
651 enum intr_type flags, void **cookiep)
653 struct intr_handler *ih, *temp_ih;
654 struct intr_thread *it;
656 if (ie == NULL || name == NULL || (handler == NULL && filter == NULL))
659 /* Allocate and populate an interrupt handler structure. */
660 ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO);
661 ih->ih_filter = filter;
662 ih->ih_handler = handler;
663 ih->ih_argument = arg;
664 strlcpy(ih->ih_name, name, sizeof(ih->ih_name));
667 if (flags & INTR_EXCL)
668 ih->ih_flags = IH_EXCLUSIVE;
669 if (flags & INTR_MPSAFE)
670 ih->ih_flags |= IH_MPSAFE;
671 if (flags & INTR_ENTROPY)
672 ih->ih_flags |= IH_ENTROPY;
674 /* We can only have one exclusive handler in a event. */
675 mtx_lock(&ie->ie_lock);
676 if (!TAILQ_EMPTY(&ie->ie_handlers)) {
677 if ((flags & INTR_EXCL) ||
678 (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) {
679 mtx_unlock(&ie->ie_lock);
685 /* For filtered handlers, create a private ithread to run on. */
686 if (filter != NULL && handler != NULL) {
687 mtx_unlock(&ie->ie_lock);
688 it = ithread_create("intr: newborn", ih);
689 mtx_lock(&ie->ie_lock);
692 ithread_update(it); /* XXX - do we really need this?!?!? */
693 } else { /* Create the global per-event thread if we need one. */
694 while (ie->ie_thread == NULL && handler != NULL) {
695 if (ie->ie_flags & IE_ADDING_THREAD)
696 msleep(ie, &ie->ie_lock, 0, "ithread", 0);
698 ie->ie_flags |= IE_ADDING_THREAD;
699 mtx_unlock(&ie->ie_lock);
700 it = ithread_create("intr: newborn", ih);
701 mtx_lock(&ie->ie_lock);
702 ie->ie_flags &= ~IE_ADDING_THREAD;
711 /* Add the new handler to the event in priority order. */
712 TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) {
713 if (temp_ih->ih_pri > ih->ih_pri)
717 TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next);
719 TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next);
720 intr_event_update(ie);
722 CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name,
724 mtx_unlock(&ie->ie_lock);
733 * Append a description preceded by a ':' to the name of the specified
737 intr_event_describe_handler(struct intr_event *ie, void *cookie,
740 struct intr_handler *ih;
744 mtx_lock(&ie->ie_lock);
746 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
751 mtx_unlock(&ie->ie_lock);
752 panic("handler %p not found in interrupt event %p", cookie, ie);
758 * Look for an existing description by checking for an
759 * existing ":". This assumes device names do not include
760 * colons. If one is found, prepare to insert the new
761 * description at that point. If one is not found, find the
762 * end of the name to use as the insertion point.
764 start = strchr(ih->ih_name, ':');
766 start = strchr(ih->ih_name, 0);
769 * See if there is enough remaining room in the string for the
770 * description + ":". The "- 1" leaves room for the trailing
771 * '\0'. The "+ 1" accounts for the colon.
773 space = sizeof(ih->ih_name) - (start - ih->ih_name) - 1;
774 if (strlen(descr) + 1 > space) {
775 mtx_unlock(&ie->ie_lock);
779 /* Append a colon followed by the description. */
781 strcpy(start + 1, descr);
782 intr_event_update(ie);
783 mtx_unlock(&ie->ie_lock);
788 * Return the ie_source field from the intr_event an intr_handler is
792 intr_handler_source(void *cookie)
794 struct intr_handler *ih;
795 struct intr_event *ie;
797 ih = (struct intr_handler *)cookie;
802 ("interrupt handler \"%s\" has a NULL interrupt event",
804 return (ie->ie_source);
808 * Sleep until an ithread finishes executing an interrupt handler.
810 * XXX Doesn't currently handle interrupt filters or fast interrupt
811 * handlers. This is intended for compatibility with linux drivers
812 * only. Do not use in BSD code.
817 struct intr_event *ie;
818 struct intr_thread *ithd;
821 ie = intr_lookup(irq);
824 if (ie->ie_thread == NULL)
826 ithd = ie->ie_thread;
827 td = ithd->it_thread;
829 * We set the flag and wait for it to be cleared to avoid
830 * long delays with potentially busy interrupt handlers
831 * were we to only sample TD_AWAITING_INTR() every tick.
834 if (!TD_AWAITING_INTR(td)) {
835 ithd->it_flags |= IT_WAIT;
836 while (ithd->it_flags & IT_WAIT) {
849 intr_event_remove_handler(void *cookie)
851 struct intr_handler *handler = (struct intr_handler *)cookie;
852 struct intr_event *ie;
854 struct intr_handler *ih;
862 ie = handler->ih_event;
864 ("interrupt handler \"%s\" has a NULL interrupt event",
866 mtx_lock(&ie->ie_lock);
867 CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name,
870 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next)
873 mtx_unlock(&ie->ie_lock);
874 panic("interrupt handler \"%s\" not found in interrupt event \"%s\"",
875 ih->ih_name, ie->ie_name);
879 * If there is no ithread, then just remove the handler and return.
880 * XXX: Note that an INTR_FAST handler might be running on another
883 if (ie->ie_thread == NULL) {
884 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next);
885 mtx_unlock(&ie->ie_lock);
886 free(handler, M_ITHREAD);
891 * If the interrupt thread is already running, then just mark this
892 * handler as being dead and let the ithread do the actual removal.
894 * During a cold boot while cold is set, msleep() does not sleep,
895 * so we have to remove the handler here rather than letting the
898 thread_lock(ie->ie_thread->it_thread);
899 if (!TD_AWAITING_INTR(ie->ie_thread->it_thread) && !cold) {
900 handler->ih_flags |= IH_DEAD;
903 * Ensure that the thread will process the handler list
904 * again and remove this handler if it has already passed
907 * The release part of the following store ensures
908 * that the update of ih_flags is ordered before the
909 * it_need setting. See the comment before
910 * atomic_cmpset_acq(&ithd->it_need, ...) operation in
911 * the ithread_execute_handlers().
913 atomic_store_rel_int(&ie->ie_thread->it_need, 1);
915 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next);
916 thread_unlock(ie->ie_thread->it_thread);
917 while (handler->ih_flags & IH_DEAD)
918 msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0);
919 intr_event_update(ie);
922 * XXX: This could be bad in the case of ppbus(8). Also, I think
923 * this could lead to races of stale data when servicing an
927 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
928 if (!(ih->ih_flags & IH_FAST)) {
934 ithread_destroy(ie->ie_thread);
935 ie->ie_thread = NULL;
938 mtx_unlock(&ie->ie_lock);
939 free(handler, M_ITHREAD);
944 intr_event_schedule_thread(struct intr_event *ie)
946 struct intr_entropy entropy;
947 struct intr_thread *it;
953 * If no ithread or no handlers, then we have a stray interrupt.
955 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) ||
956 ie->ie_thread == NULL)
965 * If any of the handlers for this ithread claim to be good
966 * sources of entropy, then gather some.
968 if (ie->ie_flags & IE_ENTROPY) {
969 entropy.event = (uintptr_t)ie;
971 random_harvest_queue(&entropy, sizeof(entropy), 2, RANDOM_INTERRUPT);
974 KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name));
977 * Set it_need to tell the thread to keep running if it is already
978 * running. Then, lock the thread and see if we actually need to
979 * put it on the runqueue.
981 * Use store_rel to arrange that the store to ih_need in
982 * swi_sched() is before the store to it_need and prepare for
983 * transfer of this order to loads in the ithread.
985 atomic_store_rel_int(&it->it_need, 1);
987 if (TD_AWAITING_INTR(td)) {
988 CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid,
991 sched_add(td, SRQ_INTR);
993 CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d",
994 __func__, p->p_pid, td->td_name, it->it_need, td->td_state);
1002 intr_event_remove_handler(void *cookie)
1004 struct intr_handler *handler = (struct intr_handler *)cookie;
1005 struct intr_event *ie;
1006 struct intr_thread *it;
1008 struct intr_handler *ih;
1014 if (handler == NULL)
1016 ie = handler->ih_event;
1018 ("interrupt handler \"%s\" has a NULL interrupt event",
1020 mtx_lock(&ie->ie_lock);
1021 CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name,
1024 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next)
1027 mtx_unlock(&ie->ie_lock);
1028 panic("interrupt handler \"%s\" not found in interrupt event \"%s\"",
1029 ih->ih_name, ie->ie_name);
1033 * If there are no ithreads (per event and per handler), then
1034 * just remove the handler and return.
1035 * XXX: Note that an INTR_FAST handler might be running on another CPU!
1037 if (ie->ie_thread == NULL && handler->ih_thread == NULL) {
1038 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next);
1039 mtx_unlock(&ie->ie_lock);
1040 free(handler, M_ITHREAD);
1044 /* Private or global ithread? */
1045 it = (handler->ih_thread) ? handler->ih_thread : ie->ie_thread;
1047 * If the interrupt thread is already running, then just mark this
1048 * handler as being dead and let the ithread do the actual removal.
1050 * During a cold boot while cold is set, msleep() does not sleep,
1051 * so we have to remove the handler here rather than letting the
1054 thread_lock(it->it_thread);
1055 if (!TD_AWAITING_INTR(it->it_thread) && !cold) {
1056 handler->ih_flags |= IH_DEAD;
1059 * Ensure that the thread will process the handler list
1060 * again and remove this handler if it has already passed
1063 * The release part of the following store ensures
1064 * that the update of ih_flags is ordered before the
1065 * it_need setting. See the comment before
1066 * atomic_cmpset_acq(&ithd->it_need, ...) operation in
1067 * the ithread_execute_handlers().
1069 atomic_store_rel_int(&it->it_need, 1);
1071 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next);
1072 thread_unlock(it->it_thread);
1073 while (handler->ih_flags & IH_DEAD)
1074 msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0);
1076 * At this point, the handler has been disconnected from the event,
1077 * so we can kill the private ithread if any.
1079 if (handler->ih_thread) {
1080 ithread_destroy(handler->ih_thread);
1081 handler->ih_thread = NULL;
1083 intr_event_update(ie);
1086 * XXX: This could be bad in the case of ppbus(8). Also, I think
1087 * this could lead to races of stale data when servicing an
1091 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
1092 if (handler != NULL) {
1098 ithread_destroy(ie->ie_thread);
1099 ie->ie_thread = NULL;
1102 mtx_unlock(&ie->ie_lock);
1103 free(handler, M_ITHREAD);
1108 intr_event_schedule_thread(struct intr_event *ie, struct intr_thread *it)
1110 struct intr_entropy entropy;
1116 * If no ithread or no handlers, then we have a stray interrupt.
1118 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) || it == NULL)
1126 * If any of the handlers for this ithread claim to be good
1127 * sources of entropy, then gather some.
1129 if (ie->ie_flags & IE_ENTROPY) {
1130 entropy.event = (uintptr_t)ie;
1132 random_harvest_queue(&entropy, sizeof(entropy), 2, RANDOM_INTERRUPT);
1135 KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name));
1138 * Set it_need to tell the thread to keep running if it is already
1139 * running. Then, lock the thread and see if we actually need to
1140 * put it on the runqueue.
1142 * Use store_rel to arrange that the store to ih_need in
1143 * swi_sched() is before the store to it_need and prepare for
1144 * transfer of this order to loads in the ithread.
1146 atomic_store_rel_int(&it->it_need, 1);
1148 if (TD_AWAITING_INTR(td)) {
1149 CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid,
1152 sched_add(td, SRQ_INTR);
1154 CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d",
1155 __func__, p->p_pid, td->td_name, it->it_need, td->td_state);
1164 * Allow interrupt event binding for software interrupt handlers -- a no-op,
1165 * since interrupts are generated in software rather than being directed by
1169 swi_assign_cpu(void *arg, int cpu)
1176 * Add a software interrupt handler to a specified event. If a given event
1177 * is not specified, then a new event is created.
1180 swi_add(struct intr_event **eventp, const char *name, driver_intr_t handler,
1181 void *arg, int pri, enum intr_type flags, void **cookiep)
1183 struct intr_event *ie;
1186 if (flags & INTR_ENTROPY)
1189 ie = (eventp != NULL) ? *eventp : NULL;
1192 if (!(ie->ie_flags & IE_SOFT))
1195 error = intr_event_create(&ie, NULL, IE_SOFT, 0,
1196 NULL, NULL, NULL, swi_assign_cpu, "swi%d:", pri);
1202 error = intr_event_add_handler(ie, name, NULL, handler, arg,
1203 PI_SWI(pri), flags, cookiep);
1208 * Schedule a software interrupt thread.
1211 swi_sched(void *cookie, int flags)
1213 struct intr_handler *ih = (struct intr_handler *)cookie;
1214 struct intr_event *ie = ih->ih_event;
1215 struct intr_entropy entropy;
1218 CTR3(KTR_INTR, "swi_sched: %s %s need=%d", ie->ie_name, ih->ih_name,
1221 entropy.event = (uintptr_t)ih;
1222 entropy.td = curthread;
1223 random_harvest_queue(&entropy, sizeof(entropy), 1, RANDOM_SWI);
1226 * Set ih_need for this handler so that if the ithread is already
1227 * running it will execute this handler on the next pass. Otherwise,
1228 * it will execute it the next time it runs.
1232 if (!(flags & SWI_DELAY)) {
1235 error = intr_event_schedule_thread(ie, ie->ie_thread);
1237 error = intr_event_schedule_thread(ie);
1239 KASSERT(error == 0, ("stray software interrupt"));
1244 * Remove a software interrupt handler. Currently this code does not
1245 * remove the associated interrupt event if it becomes empty. Calling code
1246 * may do so manually via intr_event_destroy(), but that's not really
1247 * an optimal interface.
1250 swi_remove(void *cookie)
1253 return (intr_event_remove_handler(cookie));
1258 priv_ithread_execute_handler(struct proc *p, struct intr_handler *ih)
1260 struct intr_event *ie;
1264 * If this handler is marked for death, remove it from
1265 * the list of handlers and wake up the sleeper.
1267 if (ih->ih_flags & IH_DEAD) {
1268 mtx_lock(&ie->ie_lock);
1269 TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next);
1270 ih->ih_flags &= ~IH_DEAD;
1272 mtx_unlock(&ie->ie_lock);
1276 /* Execute this handler. */
1277 CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x",
1278 __func__, p->p_pid, (void *)ih->ih_handler, ih->ih_argument,
1279 ih->ih_name, ih->ih_flags);
1281 if (!(ih->ih_flags & IH_MPSAFE))
1283 ih->ih_handler(ih->ih_argument);
1284 if (!(ih->ih_flags & IH_MPSAFE))
1290 * This is a public function for use by drivers that mux interrupt
1291 * handlers for child devices from their interrupt handler.
1294 intr_event_execute_handlers(struct proc *p, struct intr_event *ie)
1296 struct intr_handler *ih, *ihn;
1298 TAILQ_FOREACH_SAFE(ih, &ie->ie_handlers, ih_next, ihn) {
1300 * If this handler is marked for death, remove it from
1301 * the list of handlers and wake up the sleeper.
1303 if (ih->ih_flags & IH_DEAD) {
1304 mtx_lock(&ie->ie_lock);
1305 TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next);
1306 ih->ih_flags &= ~IH_DEAD;
1308 mtx_unlock(&ie->ie_lock);
1312 /* Skip filter only handlers */
1313 if (ih->ih_handler == NULL)
1317 * For software interrupt threads, we only execute
1318 * handlers that have their need flag set. Hardware
1319 * interrupt threads always invoke all of their handlers.
1321 * ih_need can only be 0 or 1. Failed cmpset below
1322 * means that there is no request to execute handlers,
1323 * so a retry of the cmpset is not needed.
1325 if ((ie->ie_flags & IE_SOFT) != 0 &&
1326 atomic_cmpset_int(&ih->ih_need, 1, 0) == 0)
1329 /* Execute this handler. */
1330 CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x",
1331 __func__, p->p_pid, (void *)ih->ih_handler,
1332 ih->ih_argument, ih->ih_name, ih->ih_flags);
1334 if (!(ih->ih_flags & IH_MPSAFE))
1336 ih->ih_handler(ih->ih_argument);
1337 if (!(ih->ih_flags & IH_MPSAFE))
1343 ithread_execute_handlers(struct proc *p, struct intr_event *ie)
1346 /* Interrupt handlers should not sleep. */
1347 if (!(ie->ie_flags & IE_SOFT))
1348 THREAD_NO_SLEEPING();
1349 intr_event_execute_handlers(p, ie);
1350 if (!(ie->ie_flags & IE_SOFT))
1351 THREAD_SLEEPING_OK();
1354 * Interrupt storm handling:
1356 * If this interrupt source is currently storming, then throttle
1357 * it to only fire the handler once per clock tick.
1359 * If this interrupt source is not currently storming, but the
1360 * number of back to back interrupts exceeds the storm threshold,
1361 * then enter storming mode.
1363 if (intr_storm_threshold != 0 && ie->ie_count >= intr_storm_threshold &&
1364 !(ie->ie_flags & IE_SOFT)) {
1365 /* Report the message only once every second. */
1366 if (ppsratecheck(&ie->ie_warntm, &ie->ie_warncnt, 1)) {
1368 "interrupt storm detected on \"%s\"; throttling interrupt source\n",
1376 * Now that all the handlers have had a chance to run, reenable
1377 * the interrupt source.
1379 if (ie->ie_post_ithread != NULL)
1380 ie->ie_post_ithread(ie->ie_source);
1385 * This is the main code for interrupt threads.
1388 ithread_loop(void *arg)
1390 struct intr_thread *ithd;
1391 struct intr_event *ie;
1398 ithd = (struct intr_thread *)arg;
1399 KASSERT(ithd->it_thread == td,
1400 ("%s: ithread and proc linkage out of sync", __func__));
1401 ie = ithd->it_event;
1406 * As long as we have interrupts outstanding, go through the
1407 * list of handlers, giving each one a go at it.
1411 * If we are an orphaned thread, then just die.
1413 if (ithd->it_flags & IT_DEAD) {
1414 CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__,
1415 p->p_pid, td->td_name);
1416 free(ithd, M_ITHREAD);
1421 * Service interrupts. If another interrupt arrives while
1422 * we are running, it will set it_need to note that we
1423 * should make another pass.
1425 * The load_acq part of the following cmpset ensures
1426 * that the load of ih_need in ithread_execute_handlers()
1427 * is ordered after the load of it_need here.
1429 while (atomic_cmpset_acq_int(&ithd->it_need, 1, 0) != 0)
1430 ithread_execute_handlers(p, ie);
1431 WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread");
1432 mtx_assert(&Giant, MA_NOTOWNED);
1435 * Processed all our interrupts. Now get the sched
1436 * lock. This may take a while and it_need may get
1437 * set again, so we have to check it again.
1440 if (atomic_load_acq_int(&ithd->it_need) == 0 &&
1441 (ithd->it_flags & (IT_DEAD | IT_WAIT)) == 0) {
1444 mi_switch(SW_VOL | SWT_IWAIT, NULL);
1446 if (ithd->it_flags & IT_WAIT) {
1448 ithd->it_flags &= ~IT_WAIT;
1459 * Main interrupt handling body.
1462 * o ie: the event connected to this interrupt.
1463 * o frame: some archs (i.e. i386) pass a frame to some.
1464 * handlers as their main argument.
1466 * o 0: everything ok.
1467 * o EINVAL: stray interrupt.
1470 intr_event_handle(struct intr_event *ie, struct trapframe *frame)
1472 struct intr_handler *ih;
1473 struct trapframe *oldframe;
1475 int error, ret, thread;
1479 #ifdef KSTACK_USAGE_PROF
1480 intr_prof_stack_use(td, frame);
1483 /* An interrupt with no event or handlers is a stray interrupt. */
1484 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers))
1488 * Execute fast interrupt handlers directly.
1489 * To support clock handlers, if a handler registers
1490 * with a NULL argument, then we pass it a pointer to
1491 * a trapframe as its argument.
1493 td->td_intr_nesting_level++;
1497 oldframe = td->td_intr_frame;
1498 td->td_intr_frame = frame;
1499 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
1500 if (ih->ih_filter == NULL) {
1504 CTR4(KTR_INTR, "%s: exec %p(%p) for %s", __func__,
1505 ih->ih_filter, ih->ih_argument == NULL ? frame :
1506 ih->ih_argument, ih->ih_name);
1507 if (ih->ih_argument == NULL)
1508 ret = ih->ih_filter(frame);
1510 ret = ih->ih_filter(ih->ih_argument);
1511 KASSERT(ret == FILTER_STRAY ||
1512 ((ret & (FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) != 0 &&
1513 (ret & ~(FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) == 0),
1514 ("%s: incorrect return value %#x from %s", __func__, ret,
1518 * Wrapper handler special handling:
1520 * in some particular cases (like pccard and pccbb),
1521 * the _real_ device handler is wrapped in a couple of
1522 * functions - a filter wrapper and an ithread wrapper.
1523 * In this case (and just in this case), the filter wrapper
1524 * could ask the system to schedule the ithread and mask
1525 * the interrupt source if the wrapped handler is composed
1526 * of just an ithread handler.
1528 * TODO: write a generic wrapper to avoid people rolling
1532 if (ret == FILTER_SCHEDULE_THREAD)
1536 td->td_intr_frame = oldframe;
1539 if (ie->ie_pre_ithread != NULL)
1540 ie->ie_pre_ithread(ie->ie_source);
1542 if (ie->ie_post_filter != NULL)
1543 ie->ie_post_filter(ie->ie_source);
1546 /* Schedule the ithread if needed. */
1548 error = intr_event_schedule_thread(ie);
1549 KASSERT(error == 0, ("bad stray interrupt"));
1552 td->td_intr_nesting_level--;
1557 * This is the main code for interrupt threads.
1560 ithread_loop(void *arg)
1562 struct intr_thread *ithd;
1563 struct intr_handler *ih;
1564 struct intr_event *ie;
1572 ih = (struct intr_handler *)arg;
1573 priv = (ih->ih_thread != NULL) ? 1 : 0;
1574 ithd = (priv) ? ih->ih_thread : ih->ih_event->ie_thread;
1575 KASSERT(ithd->it_thread == td,
1576 ("%s: ithread and proc linkage out of sync", __func__));
1577 ie = ithd->it_event;
1582 * As long as we have interrupts outstanding, go through the
1583 * list of handlers, giving each one a go at it.
1587 * If we are an orphaned thread, then just die.
1589 if (ithd->it_flags & IT_DEAD) {
1590 CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__,
1591 p->p_pid, td->td_name);
1592 free(ithd, M_ITHREAD);
1597 * Service interrupts. If another interrupt arrives while
1598 * we are running, it will set it_need to note that we
1599 * should make another pass.
1601 * The load_acq part of the following cmpset ensures
1602 * that the load of ih_need in ithread_execute_handlers()
1603 * is ordered after the load of it_need here.
1605 while (atomic_cmpset_acq_int(&ithd->it_need, 1, 0) != 0) {
1607 priv_ithread_execute_handler(p, ih);
1609 ithread_execute_handlers(p, ie);
1611 WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread");
1612 mtx_assert(&Giant, MA_NOTOWNED);
1615 * Processed all our interrupts. Now get the sched
1616 * lock. This may take a while and it_need may get
1617 * set again, so we have to check it again.
1620 if (atomic_load_acq_int(&ithd->it_need) == 0 &&
1621 (ithd->it_flags & (IT_DEAD | IT_WAIT)) == 0) {
1624 mi_switch(SW_VOL | SWT_IWAIT, NULL);
1626 if (ithd->it_flags & IT_WAIT) {
1628 ithd->it_flags &= ~IT_WAIT;
1639 * Main loop for interrupt filter.
1641 * Some architectures (i386, amd64 and arm) require the optional frame
1642 * parameter, and use it as the main argument for fast handler execution
1643 * when ih_argument == NULL.
1646 * o FILTER_STRAY: No filter recognized the event, and no
1647 * filter-less handler is registered on this
1649 * o FILTER_HANDLED: A filter claimed the event and served it.
1650 * o FILTER_SCHEDULE_THREAD: No filter claimed the event, but there's at
1651 * least one filter-less handler on this line.
1652 * o FILTER_HANDLED |
1653 * FILTER_SCHEDULE_THREAD: A filter claimed the event, and asked for
1654 * scheduling the per-handler ithread.
1656 * In case an ithread has to be scheduled, in *ithd there will be a
1657 * pointer to a struct intr_thread containing the thread to be
1662 intr_filter_loop(struct intr_event *ie, struct trapframe *frame,
1663 struct intr_thread **ithd)
1665 struct intr_handler *ih;
1667 int ret, thread_only;
1671 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
1673 * Execute fast interrupt handlers directly.
1674 * To support clock handlers, if a handler registers
1675 * with a NULL argument, then we pass it a pointer to
1676 * a trapframe as its argument.
1678 arg = ((ih->ih_argument == NULL) ? frame : ih->ih_argument);
1680 CTR5(KTR_INTR, "%s: exec %p/%p(%p) for %s", __func__,
1681 ih->ih_filter, ih->ih_handler, arg, ih->ih_name);
1683 if (ih->ih_filter != NULL)
1684 ret = ih->ih_filter(arg);
1689 KASSERT(ret == FILTER_STRAY ||
1690 ((ret & (FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) != 0 &&
1691 (ret & ~(FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) == 0),
1692 ("%s: incorrect return value %#x from %s", __func__, ret,
1694 if (ret & FILTER_STRAY)
1697 *ithd = ih->ih_thread;
1703 * No filters handled the interrupt and we have at least
1704 * one handler without a filter. In this case, we schedule
1705 * all of the filter-less handlers to run in the ithread.
1708 *ithd = ie->ie_thread;
1709 return (FILTER_SCHEDULE_THREAD);
1711 return (FILTER_STRAY);
1715 * Main interrupt handling body.
1718 * o ie: the event connected to this interrupt.
1719 * o frame: some archs (i.e. i386) pass a frame to some.
1720 * handlers as their main argument.
1722 * o 0: everything ok.
1723 * o EINVAL: stray interrupt.
1726 intr_event_handle(struct intr_event *ie, struct trapframe *frame)
1728 struct intr_thread *ithd;
1729 struct trapframe *oldframe;
1736 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers))
1739 td->td_intr_nesting_level++;
1742 oldframe = td->td_intr_frame;
1743 td->td_intr_frame = frame;
1744 thread = intr_filter_loop(ie, frame, &ithd);
1745 if (thread & FILTER_HANDLED) {
1746 if (ie->ie_post_filter != NULL)
1747 ie->ie_post_filter(ie->ie_source);
1749 if (ie->ie_pre_ithread != NULL)
1750 ie->ie_pre_ithread(ie->ie_source);
1752 td->td_intr_frame = oldframe;
1755 /* Interrupt storm logic */
1756 if (thread & FILTER_STRAY) {
1758 if (ie->ie_count < intr_storm_threshold)
1759 printf("Interrupt stray detection not present\n");
1762 /* Schedule an ithread if needed. */
1763 if (thread & FILTER_SCHEDULE_THREAD) {
1764 if (intr_event_schedule_thread(ie, ithd) != 0)
1765 panic("%s: impossible stray interrupt", __func__);
1767 td->td_intr_nesting_level--;
1774 * Dump details about an interrupt handler
1777 db_dump_intrhand(struct intr_handler *ih)
1781 db_printf("\t%-10s ", ih->ih_name);
1782 switch (ih->ih_pri) {
1802 if (ih->ih_pri >= PI_SOFT)
1805 db_printf("%4u", ih->ih_pri);
1809 if (ih->ih_filter != NULL) {
1811 db_printsym((uintptr_t)ih->ih_filter, DB_STGY_PROC);
1813 if (ih->ih_handler != NULL) {
1814 if (ih->ih_filter != NULL)
1817 db_printsym((uintptr_t)ih->ih_handler, DB_STGY_PROC);
1819 db_printf("(%p)", ih->ih_argument);
1821 (ih->ih_flags & (IH_EXCLUSIVE | IH_ENTROPY | IH_DEAD |
1825 if (ih->ih_flags & IH_EXCLUSIVE) {
1831 if (ih->ih_flags & IH_ENTROPY) {
1834 db_printf("ENTROPY");
1837 if (ih->ih_flags & IH_DEAD) {
1843 if (ih->ih_flags & IH_MPSAFE) {
1846 db_printf("MPSAFE");
1860 * Dump details about a event.
1863 db_dump_intr_event(struct intr_event *ie, int handlers)
1865 struct intr_handler *ih;
1866 struct intr_thread *it;
1869 db_printf("%s ", ie->ie_fullname);
1872 db_printf("(pid %d)", it->it_thread->td_proc->p_pid);
1874 db_printf("(no thread)");
1875 if ((ie->ie_flags & (IE_SOFT | IE_ENTROPY | IE_ADDING_THREAD)) != 0 ||
1876 (it != NULL && it->it_need)) {
1879 if (ie->ie_flags & IE_SOFT) {
1883 if (ie->ie_flags & IE_ENTROPY) {
1886 db_printf("ENTROPY");
1889 if (ie->ie_flags & IE_ADDING_THREAD) {
1892 db_printf("ADDING_THREAD");
1895 if (it != NULL && it->it_need) {
1905 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next)
1906 db_dump_intrhand(ih);
1910 * Dump data about interrupt handlers
1912 DB_SHOW_COMMAND(intr, db_show_intr)
1914 struct intr_event *ie;
1917 verbose = strchr(modif, 'v') != NULL;
1918 all = strchr(modif, 'a') != NULL;
1919 TAILQ_FOREACH(ie, &event_list, ie_list) {
1920 if (!all && TAILQ_EMPTY(&ie->ie_handlers))
1922 db_dump_intr_event(ie, verbose);
1930 * Start standard software interrupt threads
1933 start_softintr(void *dummy)
1936 if (swi_add(NULL, "vm", swi_vm, NULL, SWI_VM, INTR_MPSAFE, &vm_ih))
1937 panic("died while creating vm swi ithread");
1939 SYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr,
1943 * Sysctls used by systat and others: hw.intrnames and hw.intrcnt.
1944 * The data for this machine dependent, and the declarations are in machine
1945 * dependent code. The layout of intrnames and intrcnt however is machine
1948 * We do not know the length of intrcnt and intrnames at compile time, so
1949 * calculate things at run time.
1952 sysctl_intrnames(SYSCTL_HANDLER_ARGS)
1954 return (sysctl_handle_opaque(oidp, intrnames, sintrnames, req));
1957 SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD,
1958 NULL, 0, sysctl_intrnames, "", "Interrupt Names");
1961 sysctl_intrcnt(SYSCTL_HANDLER_ARGS)
1964 uint32_t *intrcnt32;
1968 if (req->flags & SCTL_MASK32) {
1970 return (sysctl_handle_opaque(oidp, NULL, sintrcnt / 2, req));
1971 intrcnt32 = malloc(sintrcnt / 2, M_TEMP, M_NOWAIT);
1972 if (intrcnt32 == NULL)
1974 for (i = 0; i < sintrcnt / sizeof (u_long); i++)
1975 intrcnt32[i] = intrcnt[i];
1976 error = sysctl_handle_opaque(oidp, intrcnt32, sintrcnt / 2, req);
1977 free(intrcnt32, M_TEMP);
1981 return (sysctl_handle_opaque(oidp, intrcnt, sintrcnt, req));
1984 SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD,
1985 NULL, 0, sysctl_intrcnt, "", "Interrupt Counts");
1989 * DDB command to dump the interrupt statistics.
1991 DB_SHOW_COMMAND(intrcnt, db_show_intrcnt)
1999 for (i = intrcnt; j < (sintrcnt / sizeof(u_long)) && !db_pager_quit;
2004 db_printf("%s\t%lu\n", cp, *i);
2005 cp += strlen(cp) + 1;