2 * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com> All rights reserved.
3 * Copyright (c) 1997, Stefan Esser <se@freebsd.org> All rights reserved.
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.
26 * $FreeBSD: src/sys/kern/kern_intr.c,v 1.24.2.1 2001/10/14 20:05:50 luigi Exp $
27 * $DragonFly: src/sys/kern/kern_intr.c,v 1.55 2008/09/01 12:49:00 sephe Exp $
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/malloc.h>
34 #include <sys/kernel.h>
35 #include <sys/sysctl.h>
36 #include <sys/thread.h>
38 #include <sys/random.h>
39 #include <sys/serialize.h>
40 #include <sys/interrupt.h>
42 #include <sys/machintr.h>
44 #include <machine/frame.h>
46 #include <sys/interrupt.h>
48 #include <sys/thread2.h>
49 #include <sys/mplock2.h>
53 typedef struct intrec {
55 struct intr_info *info;
61 struct lwkt_serialize *serializer;
66 struct thread i_thread;
67 struct random_softc i_random;
69 long i_count; /* interrupts dispatched */
70 int i_mplock_required;
75 unsigned long i_straycount;
76 } intr_info_ary[MAX_INTS];
78 int max_installed_hard_intr;
79 int max_installed_soft_intr;
81 #define EMERGENCY_INTR_POLLING_FREQ_MAX 20000
83 static int sysctl_emergency_freq(SYSCTL_HANDLER_ARGS);
84 static int sysctl_emergency_enable(SYSCTL_HANDLER_ARGS);
85 static void emergency_intr_timer_callback(systimer_t, struct intrframe *);
86 static void ithread_handler(void *arg);
87 static void ithread_emergency(void *arg);
88 static void report_stray_interrupt(int intr, struct intr_info *info);
89 static void int_moveto_destcpu(int *, int *, int);
90 static void int_moveto_origcpu(int, int);
92 int intr_info_size = sizeof(intr_info_ary) / sizeof(intr_info_ary[0]);
94 static struct systimer emergency_intr_timer;
95 static struct thread emergency_intr_thread;
97 #define ISTATE_NOTHREAD 0
98 #define ISTATE_NORMAL 1
99 #define ISTATE_LIVELOCKED 2
101 static int livelock_limit = 40000;
102 static int livelock_lowater = 20000;
103 static int livelock_debug = -1;
104 SYSCTL_INT(_kern, OID_AUTO, livelock_limit,
105 CTLFLAG_RW, &livelock_limit, 0, "Livelock interrupt rate limit");
106 SYSCTL_INT(_kern, OID_AUTO, livelock_lowater,
107 CTLFLAG_RW, &livelock_lowater, 0, "Livelock low-water mark restore");
108 SYSCTL_INT(_kern, OID_AUTO, livelock_debug,
109 CTLFLAG_RW, &livelock_debug, 0, "Livelock debug intr#");
111 static int emergency_intr_enable = 0; /* emergency interrupt polling */
112 TUNABLE_INT("kern.emergency_intr_enable", &emergency_intr_enable);
113 SYSCTL_PROC(_kern, OID_AUTO, emergency_intr_enable, CTLTYPE_INT | CTLFLAG_RW,
114 0, 0, sysctl_emergency_enable, "I", "Emergency Interrupt Poll Enable");
116 static int emergency_intr_freq = 10; /* emergency polling frequency */
117 TUNABLE_INT("kern.emergency_intr_freq", &emergency_intr_freq);
118 SYSCTL_PROC(_kern, OID_AUTO, emergency_intr_freq, CTLTYPE_INT | CTLFLAG_RW,
119 0, 0, sysctl_emergency_freq, "I", "Emergency Interrupt Poll Frequency");
122 * Sysctl support routines
125 sysctl_emergency_enable(SYSCTL_HANDLER_ARGS)
129 enabled = emergency_intr_enable;
130 error = sysctl_handle_int(oidp, &enabled, 0, req);
131 if (error || req->newptr == NULL)
133 emergency_intr_enable = enabled;
134 if (emergency_intr_enable) {
135 systimer_adjust_periodic(&emergency_intr_timer,
136 emergency_intr_freq);
138 systimer_adjust_periodic(&emergency_intr_timer, 1);
144 sysctl_emergency_freq(SYSCTL_HANDLER_ARGS)
148 phz = emergency_intr_freq;
149 error = sysctl_handle_int(oidp, &phz, 0, req);
150 if (error || req->newptr == NULL)
154 else if (phz > EMERGENCY_INTR_POLLING_FREQ_MAX)
155 phz = EMERGENCY_INTR_POLLING_FREQ_MAX;
157 emergency_intr_freq = phz;
158 if (emergency_intr_enable) {
159 systimer_adjust_periodic(&emergency_intr_timer,
160 emergency_intr_freq);
162 systimer_adjust_periodic(&emergency_intr_timer, 1);
168 * Register an SWI or INTerrupt handler.
171 register_swi(int intr, inthand2_t *handler, void *arg, const char *name,
172 struct lwkt_serialize *serializer)
174 if (intr < FIRST_SOFTINT || intr >= MAX_INTS)
175 panic("register_swi: bad intr %d", intr);
176 return(register_int(intr, handler, arg, name, serializer, 0));
180 register_swi_mp(int intr, inthand2_t *handler, void *arg, const char *name,
181 struct lwkt_serialize *serializer)
183 if (intr < FIRST_SOFTINT || intr >= MAX_INTS)
184 panic("register_swi: bad intr %d", intr);
185 return(register_int(intr, handler, arg, name, serializer, INTR_MPSAFE));
189 register_int(int intr, inthand2_t *handler, void *arg, const char *name,
190 struct lwkt_serialize *serializer, int intr_flags)
192 struct intr_info *info;
193 struct intrec **list;
195 int orig_cpuid, cpuid;
197 if (intr < 0 || intr >= MAX_INTS)
198 panic("register_int: bad intr %d", intr);
201 info = &intr_info_ary[intr];
204 * Construct an interrupt handler record
206 rec = kmalloc(sizeof(struct intrec), M_DEVBUF, M_INTWAIT);
207 rec->name = kmalloc(strlen(name) + 1, M_DEVBUF, M_INTWAIT);
208 strcpy(rec->name, name);
211 rec->handler = handler;
214 rec->intr_flags = intr_flags;
216 rec->serializer = serializer;
219 * Create an emergency polling thread and set up a systimer to wake
222 if (emergency_intr_thread.td_kstack == NULL) {
223 lwkt_create(ithread_emergency, NULL, NULL, &emergency_intr_thread,
224 TDF_STOPREQ | TDF_INTTHREAD, -1, "ithread emerg");
225 systimer_init_periodic_nq(&emergency_intr_timer,
226 emergency_intr_timer_callback, &emergency_intr_thread,
227 (emergency_intr_enable ? emergency_intr_freq : 1));
230 int_moveto_destcpu(&orig_cpuid, &cpuid, intr);
233 * Create an interrupt thread if necessary, leave it in an unscheduled
236 if (info->i_state == ISTATE_NOTHREAD) {
237 info->i_state = ISTATE_NORMAL;
238 lwkt_create(ithread_handler, (void *)(intptr_t)intr, NULL,
239 &info->i_thread, TDF_STOPREQ | TDF_INTTHREAD, -1,
241 if (intr >= FIRST_SOFTINT)
242 lwkt_setpri(&info->i_thread, TDPRI_SOFT_NORM);
244 lwkt_setpri(&info->i_thread, TDPRI_INT_MED);
245 info->i_thread.td_preemptable = lwkt_preempt;
248 list = &info->i_reclist;
251 * Keep track of how many fast and slow interrupts we have.
252 * Set i_mplock_required if any handler in the chain requires
253 * the MP lock to operate.
255 if ((intr_flags & INTR_MPSAFE) == 0)
256 info->i_mplock_required = 1;
257 if (intr_flags & INTR_CLOCK)
263 * Enable random number generation keying off of this interrupt.
265 if ((intr_flags & INTR_NOENTROPY) == 0 && info->i_random.sc_enabled == 0) {
266 info->i_random.sc_enabled = 1;
267 info->i_random.sc_intr = intr;
271 * Add the record to the interrupt list.
274 while (*list != NULL)
275 list = &(*list)->next;
280 * Update max_installed_hard_intr to make the emergency intr poll
281 * a bit more efficient.
283 if (intr < FIRST_SOFTINT) {
284 if (max_installed_hard_intr <= intr)
285 max_installed_hard_intr = intr + 1;
287 if (max_installed_soft_intr <= intr)
288 max_installed_soft_intr = intr + 1;
292 * Setup the machine level interrupt vector
294 * XXX temporary workaround for some ACPI brokedness. ACPI installs
295 * its interrupt too early, before the IOAPICs have been configured,
296 * which means the IOAPIC is not enabled by the registration of the
297 * ACPI interrupt. Anything else sharing that IRQ will wind up not
298 * being enabled. Temporarily work around the problem by always
299 * installing and enabling on every new interrupt handler, even
300 * if one has already been setup on that irq.
302 if (intr < FIRST_SOFTINT /* && info->i_slow + info->i_fast == 1*/) {
303 if (machintr_vector_setup(intr, intr_flags))
304 kprintf("machintr_vector_setup: failed on irq %d\n", intr);
307 int_moveto_origcpu(orig_cpuid, cpuid);
313 unregister_swi(void *id)
319 unregister_int(void *id)
321 struct intr_info *info;
322 struct intrec **list;
324 int intr, orig_cpuid, cpuid;
326 intr = ((intrec_t)id)->intr;
328 if (intr < 0 || intr >= MAX_INTS)
329 panic("register_int: bad intr %d", intr);
331 info = &intr_info_ary[intr];
333 int_moveto_destcpu(&orig_cpuid, &cpuid, intr);
336 * Remove the interrupt descriptor, adjust the descriptor count,
337 * and teardown the machine level vector if this was the last interrupt.
340 list = &info->i_reclist;
341 while ((rec = *list) != NULL) {
350 if (rec->intr_flags & INTR_CLOCK)
354 if (intr < FIRST_SOFTINT && info->i_fast + info->i_slow == 0)
355 machintr_vector_teardown(intr);
358 * Clear i_mplock_required if no handlers in the chain require the
361 for (rec0 = info->i_reclist; rec0; rec0 = rec0->next) {
362 if ((rec0->intr_flags & INTR_MPSAFE) == 0)
366 info->i_mplock_required = 0;
371 int_moveto_origcpu(orig_cpuid, cpuid);
377 kfree(rec->name, M_DEVBUF);
378 kfree(rec, M_DEVBUF);
380 kprintf("warning: unregister_int: int %d handler for %s not found\n",
381 intr, ((intrec_t)id)->name);
386 get_registered_name(int intr)
390 if (intr < 0 || intr >= MAX_INTS)
391 panic("register_int: bad intr %d", intr);
393 if ((rec = intr_info_ary[intr].i_reclist) == NULL)
402 count_registered_ints(int intr)
404 struct intr_info *info;
406 if (intr < 0 || intr >= MAX_INTS)
407 panic("register_int: bad intr %d", intr);
408 info = &intr_info_ary[intr];
409 return(info->i_fast + info->i_slow);
413 get_interrupt_counter(int intr)
415 struct intr_info *info;
417 if (intr < 0 || intr >= MAX_INTS)
418 panic("register_int: bad intr %d", intr);
419 info = &intr_info_ary[intr];
420 return(info->i_count);
425 swi_setpriority(int intr, int pri)
427 struct intr_info *info;
429 if (intr < FIRST_SOFTINT || intr >= MAX_INTS)
430 panic("register_swi: bad intr %d", intr);
431 info = &intr_info_ary[intr];
432 if (info->i_state != ISTATE_NOTHREAD)
433 lwkt_setpri(&info->i_thread, pri);
437 register_randintr(int intr)
439 struct intr_info *info;
441 if (intr < 0 || intr >= MAX_INTS)
442 panic("register_randintr: bad intr %d", intr);
443 info = &intr_info_ary[intr];
444 info->i_random.sc_intr = intr;
445 info->i_random.sc_enabled = 1;
449 unregister_randintr(int intr)
451 struct intr_info *info;
453 if (intr < 0 || intr >= MAX_INTS)
454 panic("register_swi: bad intr %d", intr);
455 info = &intr_info_ary[intr];
456 info->i_random.sc_enabled = -1;
460 next_registered_randintr(int intr)
462 struct intr_info *info;
464 if (intr < 0 || intr >= MAX_INTS)
465 panic("register_swi: bad intr %d", intr);
466 while (intr < MAX_INTS) {
467 info = &intr_info_ary[intr];
468 if (info->i_random.sc_enabled > 0)
476 * Dispatch an interrupt. If there's nothing to do we have a stray
477 * interrupt and can just return, leaving the interrupt masked.
479 * We need to schedule the interrupt and set its i_running bit. If
480 * we are not on the interrupt thread's cpu we have to send a message
481 * to the correct cpu that will issue the desired action (interlocking
482 * with the interrupt thread's critical section). We do NOT attempt to
483 * reschedule interrupts whos i_running bit is already set because
484 * this would prematurely wakeup a livelock-limited interrupt thread.
486 * i_running is only tested/set on the same cpu as the interrupt thread.
488 * We are NOT in a critical section, which will allow the scheduled
489 * interrupt to preempt us. The MP lock might *NOT* be held here.
494 sched_ithd_remote(void *arg)
496 sched_ithd((int)(intptr_t)arg);
504 struct intr_info *info;
506 info = &intr_info_ary[intr];
509 if (info->i_state != ISTATE_NOTHREAD) {
510 if (info->i_reclist == NULL) {
511 report_stray_interrupt(intr, info);
514 if (info->i_thread.td_gd == mycpu) {
515 if (info->i_running == 0) {
517 if (info->i_state != ISTATE_LIVELOCKED)
518 lwkt_schedule(&info->i_thread); /* MIGHT PREEMPT */
521 lwkt_send_ipiq(info->i_thread.td_gd,
522 sched_ithd_remote, (void *)(intptr_t)intr);
525 if (info->i_running == 0) {
527 if (info->i_state != ISTATE_LIVELOCKED)
528 lwkt_schedule(&info->i_thread); /* MIGHT PREEMPT */
533 report_stray_interrupt(intr, info);
538 report_stray_interrupt(int intr, struct intr_info *info)
540 ++info->i_straycount;
541 if (info->i_straycount < 10) {
542 if (info->i_errorticks == ticks)
544 info->i_errorticks = ticks;
545 kprintf("sched_ithd: stray interrupt %d on cpu %d\n",
547 } else if (info->i_straycount == 10) {
548 kprintf("sched_ithd: %ld stray interrupts %d on cpu %d - "
549 "there will be no further reports\n",
550 info->i_straycount, intr, mycpuid);
555 * This is run from a periodic SYSTIMER (and thus must be MP safe, the BGL
556 * might not be held).
559 ithread_livelock_wakeup(systimer_t st)
561 struct intr_info *info;
563 info = &intr_info_ary[(int)(intptr_t)st->data];
564 if (info->i_state != ISTATE_NOTHREAD)
565 lwkt_schedule(&info->i_thread);
569 * Schedule ithread within fast intr handler
571 * XXX Protect sched_ithd() call with gd_intr_nesting_level?
572 * Interrupts aren't enabled, but still...
575 ithread_fast_sched(int intr, thread_t td)
580 * We are already in critical section, exit it now to
585 crit_enter_quick(td);
591 * This function is called directly from the ICU or APIC vector code assembly
592 * to process an interrupt. The critical section and interrupt deferral
593 * checks have already been done but the function is entered WITHOUT
594 * a critical section held. The BGL may or may not be held.
596 * Must return non-zero if we do not want the vector code to re-enable
597 * the interrupt (which we don't if we have to schedule the interrupt)
599 int ithread_fast_handler(struct intrframe *frame);
602 ithread_fast_handler(struct intrframe *frame)
605 struct intr_info *info;
606 struct intrec **list;
611 intrec_t rec, next_rec;
615 intr = frame->if_vec;
619 /* We must be in critical section. */
620 KKASSERT(td->td_critcount);
622 info = &intr_info_ary[intr];
625 * If we are not processing any FAST interrupts, just schedule the thing.
627 if (info->i_fast == 0) {
629 ithread_fast_sched(intr, td);
634 * This should not normally occur since interrupts ought to be
635 * masked if the ithread has been scheduled or is running.
641 * Bump the interrupt nesting level to process any FAST interrupts.
642 * Obtain the MP lock as necessary. If the MP lock cannot be obtained,
643 * schedule the interrupt thread to deal with the issue instead.
645 * To reduce overhead, just leave the MP lock held once it has been
648 ++gd->gd_intr_nesting_level;
650 must_schedule = info->i_slow;
655 list = &info->i_reclist;
656 for (rec = *list; rec; rec = next_rec) {
657 next_rec = rec->next; /* rec may be invalid after call */
659 if (rec->intr_flags & INTR_CLOCK) {
661 if ((rec->intr_flags & INTR_MPSAFE) == 0 && got_mplock == 0) {
662 if (try_mplock() == 0) {
663 /* Couldn't get the MP lock; just schedule it. */
670 if (rec->serializer) {
671 must_schedule += lwkt_serialize_handler_try(
672 rec->serializer, rec->handler,
673 rec->argument, frame);
675 rec->handler(rec->argument, frame);
683 --gd->gd_intr_nesting_level;
690 * If we had a problem, or mixed fast and slow interrupt handlers are
691 * registered, schedule the ithread to catch the missed records (it
692 * will just re-run all of them). A return value of 0 indicates that
693 * all handlers have been run and the interrupt can be re-enabled, and
694 * a non-zero return indicates that the interrupt thread controls
697 if (must_schedule > 0)
698 ithread_fast_sched(intr, td);
699 else if (must_schedule == 0)
701 return(must_schedule);
705 * Interrupt threads run this as their main loop.
707 * The handler begins execution outside a critical section and no MP lock.
709 * The i_running state starts at 0. When an interrupt occurs, the hardware
710 * interrupt is disabled and sched_ithd() The HW interrupt remains disabled
711 * until all routines have run. We then call ithread_done() to reenable
712 * the HW interrupt and deschedule us until the next interrupt.
714 * We are responsible for atomically checking i_running and ithread_done()
715 * is responsible for atomically checking for platform-specific delayed
716 * interrupts. i_running for our irq is only set in the context of our cpu,
717 * so a critical section is a sufficient interlock.
719 #define LIVELOCK_TIMEFRAME(freq) ((freq) >> 2) /* 1/4 second */
722 ithread_handler(void *arg)
724 struct intr_info *info;
729 struct intrec **list;
732 struct systimer ill_timer; /* enforced freq. timer */
733 u_int ill_count; /* interrupt livelock counter */
736 intr = (int)(intptr_t)arg;
737 info = &intr_info_ary[intr];
738 list = &info->i_reclist;
741 * The loop must be entered with one critical section held. The thread
742 * does not hold the mplock on startup.
745 lseconds = gd->gd_time_seconds;
751 * The chain is only considered MPSAFE if all its interrupt handlers
752 * are MPSAFE. However, if intr_mpsafe has been turned off we
753 * always operate with the BGL.
756 if (info->i_mplock_required != mpheld) {
757 if (info->i_mplock_required) {
758 KKASSERT(mpheld == 0);
762 KKASSERT(mpheld != 0);
770 * If an interrupt is pending, clear i_running and execute the
771 * handlers. Note that certain types of interrupts can re-trigger
772 * and set i_running again.
774 * Each handler is run in a critical section. Note that we run both
775 * FAST and SLOW designated service routines.
777 if (info->i_running) {
782 report_stray_interrupt(intr, info);
784 for (rec = *list; rec; rec = nrec) {
786 if (rec->serializer) {
787 lwkt_serialize_handler_call(rec->serializer, rec->handler,
788 rec->argument, NULL);
790 rec->handler(rec->argument, NULL);
796 * This is our interrupt hook to add rate randomness to the random
799 if (info->i_random.sc_enabled > 0)
800 add_interrupt_randomness(intr);
803 * Unmask the interrupt to allow it to trigger again. This only
804 * applies to certain types of interrupts (typ level interrupts).
805 * This can result in the interrupt retriggering, but the retrigger
806 * will not be processed until we cycle our critical section.
808 * Only unmask interrupts while handlers are installed. It is
809 * possible to hit a situation where no handlers are installed
810 * due to a device driver livelocking and then tearing down its
811 * interrupt on close (the parallel bus being a good example).
814 machintr_intren(intr);
817 * Do a quick exit/enter to catch any higher-priority interrupt
818 * sources, such as the statclock, so thread time accounting
819 * will still work. This may also cause an interrupt to re-trigger.
825 * LIVELOCK STATE MACHINE
827 switch(info->i_state) {
830 * Reset the count each second.
832 if (lseconds != gd->gd_time_seconds) {
833 lseconds = gd->gd_time_seconds;
838 * If we did not exceed the frequency limit, we are done.
839 * If the interrupt has not retriggered we deschedule ourselves.
841 if (ill_count <= livelock_limit) {
842 if (info->i_running == 0) {
843 lwkt_deschedule_self(gd->gd_curthread);
850 * Otherwise we are livelocked. Set up a periodic systimer
851 * to wake the thread up at the limit frequency.
853 kprintf("intr %d at %d/%d hz, livelocked limit engaged!\n",
854 intr, ill_count, livelock_limit);
855 info->i_state = ISTATE_LIVELOCKED;
856 if ((use_limit = livelock_limit) < 100)
858 else if (use_limit > 500000)
860 systimer_init_periodic_nq(&ill_timer, ithread_livelock_wakeup,
861 (void *)(intptr_t)intr, use_limit);
863 case ISTATE_LIVELOCKED:
865 * Wait for our periodic timer to go off. Since the interrupt
866 * has re-armed it can still set i_running, but it will not
867 * reschedule us while we are in a livelocked state.
869 lwkt_deschedule_self(gd->gd_curthread);
873 * Check once a second to see if the livelock condition no
876 if (lseconds != gd->gd_time_seconds) {
877 lseconds = gd->gd_time_seconds;
878 if (ill_count < livelock_lowater) {
879 info->i_state = ISTATE_NORMAL;
880 systimer_del(&ill_timer);
881 kprintf("intr %d at %d/%d hz, livelock removed\n",
882 intr, ill_count, livelock_lowater);
883 } else if (livelock_debug == intr ||
884 (bootverbose && cold)) {
885 kprintf("intr %d at %d/%d hz, in livelock\n",
886 intr, ill_count, livelock_lowater);
897 * Emergency interrupt polling thread. The thread begins execution
898 * outside a critical section with the BGL held.
900 * If emergency interrupt polling is enabled, this thread will
901 * execute all system interrupts not marked INTR_NOPOLL at the
902 * specified polling frequency.
904 * WARNING! This thread runs *ALL* interrupt service routines that
905 * are not marked INTR_NOPOLL, which basically means everything except
906 * the 8254 clock interrupt and the ATA interrupt. It has very high
907 * overhead and should only be used in situations where the machine
908 * cannot otherwise be made to work. Due to the severe performance
909 * degredation, it should not be enabled on production machines.
912 ithread_emergency(void *arg __unused)
914 struct intr_info *info;
921 for (intr = 0; intr < max_installed_hard_intr; ++intr) {
922 info = &intr_info_ary[intr];
923 for (rec = info->i_reclist; rec; rec = nrec) {
924 if ((rec->intr_flags & INTR_NOPOLL) == 0) {
925 if (rec->serializer) {
926 lwkt_serialize_handler_call(rec->serializer,
927 rec->handler, rec->argument, NULL);
929 rec->handler(rec->argument, NULL);
935 lwkt_deschedule_self(curthread);
941 * Systimer callback - schedule the emergency interrupt poll thread
942 * if emergency polling is enabled.
946 emergency_intr_timer_callback(systimer_t info, struct intrframe *frame __unused)
948 if (emergency_intr_enable)
949 lwkt_schedule(info->data);
953 ithread_cpuid(int intr)
955 const struct intr_info *info;
957 KKASSERT(intr >= 0 && intr < MAX_INTS);
958 info = &intr_info_ary[intr];
960 if (info->i_state == ISTATE_NOTHREAD)
962 return info->i_thread.td_gd->gd_cpuid;
966 * Sysctls used by systat and others: hw.intrnames and hw.intrcnt.
967 * The data for this machine dependent, and the declarations are in machine
968 * dependent code. The layout of intrnames and intrcnt however is machine
971 * We do not know the length of intrcnt and intrnames at compile time, so
972 * calculate things at run time.
976 sysctl_intrnames(SYSCTL_HANDLER_ARGS)
978 struct intr_info *info;
985 for (intr = 0; error == 0 && intr < MAX_INTS; ++intr) {
986 info = &intr_info_ary[intr];
990 for (rec = info->i_reclist; rec; rec = rec->next) {
991 ksnprintf(buf + len, sizeof(buf) - len, "%s%s",
992 (len ? "/" : ""), rec->name);
993 len += strlen(buf + len);
996 ksnprintf(buf, sizeof(buf), "irq%d", intr);
999 error = SYSCTL_OUT(req, buf, len + 1);
1005 SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD,
1006 NULL, 0, sysctl_intrnames, "", "Interrupt Names");
1009 sysctl_intrcnt(SYSCTL_HANDLER_ARGS)
1011 struct intr_info *info;
1015 for (intr = 0; intr < max_installed_hard_intr; ++intr) {
1016 info = &intr_info_ary[intr];
1018 error = SYSCTL_OUT(req, &info->i_count, sizeof(info->i_count));
1022 for (intr = FIRST_SOFTINT; intr < max_installed_soft_intr; ++intr) {
1023 info = &intr_info_ary[intr];
1025 error = SYSCTL_OUT(req, &info->i_count, sizeof(info->i_count));
1033 SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD,
1034 NULL, 0, sysctl_intrcnt, "", "Interrupt Counts");
1037 int_moveto_destcpu(int *orig_cpuid0, int *cpuid0, int intr)
1039 int orig_cpuid = mycpuid, cpuid;
1043 ksnprintf(envpath, sizeof(envpath), "hw.irq.%d.dest", intr);
1044 kgetenv_int(envpath, &cpuid);
1048 if (cpuid != orig_cpuid)
1049 lwkt_migratecpu(cpuid);
1051 *orig_cpuid0 = orig_cpuid;
1056 int_moveto_origcpu(int orig_cpuid, int cpuid)
1058 if (cpuid != orig_cpuid)
1059 lwkt_migratecpu(orig_cpuid);