d0b4135e00
away, instead only exit storming mode when an interrupt stops firing long enough for the ithread to exit the loop and go back to sleep. Tested by: macrus (cruder version)
810 lines
20 KiB
C
810 lines
20 KiB
C
/*
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* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/rtprio.h>
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#include <sys/systm.h>
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#include <sys/interrupt.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/ktr.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/random.h>
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#include <sys/resourcevar.h>
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#include <sys/sysctl.h>
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#include <sys/unistd.h>
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#include <sys/vmmeter.h>
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#include <machine/atomic.h>
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#include <machine/cpu.h>
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#include <machine/md_var.h>
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#include <machine/stdarg.h>
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#ifdef DDB
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#include <ddb/ddb.h>
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#include <ddb/db_sym.h>
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#endif
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struct int_entropy {
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struct proc *proc;
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uintptr_t vector;
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};
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struct ithd *clk_ithd;
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struct ithd *tty_ithd;
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void *softclock_ih;
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void *vm_ih;
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static MALLOC_DEFINE(M_ITHREAD, "ithread", "Interrupt Threads");
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static int intr_storm_threshold = 500;
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TUNABLE_INT("hw.intr_storm_threshold", &intr_storm_threshold);
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SYSCTL_INT(_hw, OID_AUTO, intr_storm_threshold, CTLFLAG_RW,
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&intr_storm_threshold, 0,
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"Number of consecutive interrupts before storm protection is enabled");
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static void ithread_loop(void *);
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static void ithread_update(struct ithd *);
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static void start_softintr(void *);
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u_char
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ithread_priority(enum intr_type flags)
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{
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u_char pri;
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flags &= (INTR_TYPE_TTY | INTR_TYPE_BIO | INTR_TYPE_NET |
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INTR_TYPE_CAM | INTR_TYPE_MISC | INTR_TYPE_CLK | INTR_TYPE_AV);
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switch (flags) {
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case INTR_TYPE_TTY:
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pri = PI_TTYLOW;
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break;
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case INTR_TYPE_BIO:
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/*
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* XXX We need to refine this. BSD/OS distinguishes
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* between tape and disk priorities.
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*/
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pri = PI_DISK;
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break;
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case INTR_TYPE_NET:
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pri = PI_NET;
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break;
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case INTR_TYPE_CAM:
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pri = PI_DISK; /* XXX or PI_CAM? */
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break;
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case INTR_TYPE_AV: /* Audio/video */
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pri = PI_AV;
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break;
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case INTR_TYPE_CLK:
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pri = PI_REALTIME;
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break;
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case INTR_TYPE_MISC:
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pri = PI_DULL; /* don't care */
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break;
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default:
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/* We didn't specify an interrupt level. */
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panic("ithread_priority: no interrupt type in flags");
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}
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return pri;
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}
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/*
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* Regenerate the name (p_comm) and priority for a threaded interrupt thread.
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*/
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static void
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ithread_update(struct ithd *ithd)
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{
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struct intrhand *ih;
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struct thread *td;
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struct proc *p;
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int missed;
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mtx_assert(&ithd->it_lock, MA_OWNED);
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td = ithd->it_td;
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if (td == NULL)
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return;
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p = td->td_proc;
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strlcpy(p->p_comm, ithd->it_name, sizeof(p->p_comm));
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ithd->it_flags &= ~IT_ENTROPY;
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ih = TAILQ_FIRST(&ithd->it_handlers);
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if (ih == NULL) {
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mtx_lock_spin(&sched_lock);
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td->td_priority = PRI_MAX_ITHD;
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td->td_base_pri = PRI_MAX_ITHD;
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mtx_unlock_spin(&sched_lock);
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return;
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}
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mtx_lock_spin(&sched_lock);
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td->td_priority = ih->ih_pri;
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td->td_base_pri = ih->ih_pri;
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mtx_unlock_spin(&sched_lock);
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missed = 0;
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TAILQ_FOREACH(ih, &ithd->it_handlers, ih_next) {
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if (strlen(p->p_comm) + strlen(ih->ih_name) + 1 <
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sizeof(p->p_comm)) {
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strcat(p->p_comm, " ");
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strcat(p->p_comm, ih->ih_name);
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} else
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missed++;
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if (ih->ih_flags & IH_ENTROPY)
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ithd->it_flags |= IT_ENTROPY;
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}
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while (missed-- > 0) {
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if (strlen(p->p_comm) + 1 == sizeof(p->p_comm)) {
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if (p->p_comm[sizeof(p->p_comm) - 2] == '+')
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p->p_comm[sizeof(p->p_comm) - 2] = '*';
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else
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p->p_comm[sizeof(p->p_comm) - 2] = '+';
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} else
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strcat(p->p_comm, "+");
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}
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CTR2(KTR_INTR, "%s: updated %s", __func__, p->p_comm);
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}
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int
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ithread_create(struct ithd **ithread, uintptr_t vector, int flags,
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void (*disable)(uintptr_t), void (*enable)(uintptr_t), const char *fmt, ...)
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{
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struct ithd *ithd;
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struct thread *td;
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struct proc *p;
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int error;
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va_list ap;
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/* The only valid flag during creation is IT_SOFT. */
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if ((flags & ~IT_SOFT) != 0)
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return (EINVAL);
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ithd = malloc(sizeof(struct ithd), M_ITHREAD, M_WAITOK | M_ZERO);
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ithd->it_vector = vector;
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ithd->it_disable = disable;
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ithd->it_enable = enable;
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ithd->it_flags = flags;
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TAILQ_INIT(&ithd->it_handlers);
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mtx_init(&ithd->it_lock, "ithread", NULL, MTX_DEF);
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va_start(ap, fmt);
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vsnprintf(ithd->it_name, sizeof(ithd->it_name), fmt, ap);
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va_end(ap);
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error = kthread_create(ithread_loop, ithd, &p, RFSTOPPED | RFHIGHPID,
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0, "%s", ithd->it_name);
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if (error) {
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mtx_destroy(&ithd->it_lock);
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free(ithd, M_ITHREAD);
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return (error);
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}
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td = FIRST_THREAD_IN_PROC(p); /* XXXKSE */
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mtx_lock_spin(&sched_lock);
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td->td_ksegrp->kg_pri_class = PRI_ITHD;
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td->td_priority = PRI_MAX_ITHD;
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TD_SET_IWAIT(td);
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mtx_unlock_spin(&sched_lock);
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ithd->it_td = td;
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td->td_ithd = ithd;
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if (ithread != NULL)
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*ithread = ithd;
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CTR2(KTR_INTR, "%s: created %s", __func__, ithd->it_name);
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return (0);
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}
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int
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ithread_destroy(struct ithd *ithread)
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{
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struct thread *td;
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if (ithread == NULL)
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return (EINVAL);
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td = ithread->it_td;
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mtx_lock(&ithread->it_lock);
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if (!TAILQ_EMPTY(&ithread->it_handlers)) {
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mtx_unlock(&ithread->it_lock);
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return (EINVAL);
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}
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ithread->it_flags |= IT_DEAD;
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mtx_lock_spin(&sched_lock);
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if (TD_AWAITING_INTR(td)) {
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TD_CLR_IWAIT(td);
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setrunqueue(td, SRQ_INTR);
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}
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mtx_unlock_spin(&sched_lock);
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mtx_unlock(&ithread->it_lock);
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CTR2(KTR_INTR, "%s: killing %s", __func__, ithread->it_name);
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return (0);
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}
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int
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ithread_add_handler(struct ithd* ithread, const char *name,
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driver_intr_t handler, void *arg, u_char pri, enum intr_type flags,
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void **cookiep)
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{
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struct intrhand *ih, *temp_ih;
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if (ithread == NULL || name == NULL || handler == NULL)
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return (EINVAL);
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ih = malloc(sizeof(struct intrhand), M_ITHREAD, M_WAITOK | M_ZERO);
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ih->ih_handler = handler;
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ih->ih_argument = arg;
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ih->ih_name = name;
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ih->ih_ithread = ithread;
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ih->ih_pri = pri;
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if (flags & INTR_FAST)
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ih->ih_flags = IH_FAST;
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else if (flags & INTR_EXCL)
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ih->ih_flags = IH_EXCLUSIVE;
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if (flags & INTR_MPSAFE)
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ih->ih_flags |= IH_MPSAFE;
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if (flags & INTR_ENTROPY)
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ih->ih_flags |= IH_ENTROPY;
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mtx_lock(&ithread->it_lock);
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if ((flags & INTR_EXCL) != 0 && !TAILQ_EMPTY(&ithread->it_handlers))
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goto fail;
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if (!TAILQ_EMPTY(&ithread->it_handlers)) {
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temp_ih = TAILQ_FIRST(&ithread->it_handlers);
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if (temp_ih->ih_flags & IH_EXCLUSIVE)
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goto fail;
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if ((ih->ih_flags & IH_FAST) && !(temp_ih->ih_flags & IH_FAST))
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goto fail;
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if (!(ih->ih_flags & IH_FAST) && (temp_ih->ih_flags & IH_FAST))
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goto fail;
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}
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TAILQ_FOREACH(temp_ih, &ithread->it_handlers, ih_next)
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if (temp_ih->ih_pri > ih->ih_pri)
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break;
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if (temp_ih == NULL)
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TAILQ_INSERT_TAIL(&ithread->it_handlers, ih, ih_next);
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else
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TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next);
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ithread_update(ithread);
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mtx_unlock(&ithread->it_lock);
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if (cookiep != NULL)
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*cookiep = ih;
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CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name,
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ithread->it_name);
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return (0);
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fail:
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mtx_unlock(&ithread->it_lock);
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free(ih, M_ITHREAD);
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return (EINVAL);
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}
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int
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ithread_remove_handler(void *cookie)
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{
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struct intrhand *handler = (struct intrhand *)cookie;
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struct ithd *ithread;
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#ifdef INVARIANTS
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struct intrhand *ih;
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#endif
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if (handler == NULL)
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return (EINVAL);
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ithread = handler->ih_ithread;
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KASSERT(ithread != NULL,
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("interrupt handler \"%s\" has a NULL interrupt thread",
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handler->ih_name));
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CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name,
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ithread->it_name);
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mtx_lock(&ithread->it_lock);
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#ifdef INVARIANTS
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TAILQ_FOREACH(ih, &ithread->it_handlers, ih_next)
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if (ih == handler)
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goto ok;
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mtx_unlock(&ithread->it_lock);
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panic("interrupt handler \"%s\" not found in interrupt thread \"%s\"",
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ih->ih_name, ithread->it_name);
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ok:
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#endif
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/*
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* If the interrupt thread is already running, then just mark this
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* handler as being dead and let the ithread do the actual removal.
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*
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* During a cold boot while cold is set, msleep() does not sleep,
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* so we have to remove the handler here rather than letting the
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* thread do it.
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*/
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mtx_lock_spin(&sched_lock);
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if (!TD_AWAITING_INTR(ithread->it_td) && !cold) {
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handler->ih_flags |= IH_DEAD;
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/*
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* Ensure that the thread will process the handler list
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* again and remove this handler if it has already passed
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* it on the list.
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*/
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ithread->it_need = 1;
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} else
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TAILQ_REMOVE(&ithread->it_handlers, handler, ih_next);
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mtx_unlock_spin(&sched_lock);
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if ((handler->ih_flags & IH_DEAD) != 0)
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msleep(handler, &ithread->it_lock, PUSER, "itrmh", 0);
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ithread_update(ithread);
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mtx_unlock(&ithread->it_lock);
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free(handler, M_ITHREAD);
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return (0);
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}
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int
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ithread_schedule(struct ithd *ithread)
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{
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struct int_entropy entropy;
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struct thread *td;
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struct thread *ctd;
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struct proc *p;
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/*
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* If no ithread or no handlers, then we have a stray interrupt.
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*/
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if ((ithread == NULL) || TAILQ_EMPTY(&ithread->it_handlers))
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return (EINVAL);
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ctd = curthread;
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td = ithread->it_td;
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p = td->td_proc;
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/*
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* If any of the handlers for this ithread claim to be good
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* sources of entropy, then gather some.
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*/
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if (harvest.interrupt && ithread->it_flags & IT_ENTROPY) {
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CTR3(KTR_INTR, "%s: pid %d (%s) gathering entropy", __func__,
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p->p_pid, p->p_comm);
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entropy.vector = ithread->it_vector;
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entropy.proc = ctd->td_proc;
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random_harvest(&entropy, sizeof(entropy), 2, 0,
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RANDOM_INTERRUPT);
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}
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KASSERT(p != NULL, ("ithread %s has no process", ithread->it_name));
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CTR4(KTR_INTR, "%s: pid %d: (%s) need = %d",
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__func__, p->p_pid, p->p_comm, ithread->it_need);
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/*
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* Set it_need to tell the thread to keep running if it is already
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* running. Then, grab sched_lock and see if we actually need to
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* put this thread on the runqueue.
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*/
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ithread->it_need = 1;
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mtx_lock_spin(&sched_lock);
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if (TD_AWAITING_INTR(td)) {
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CTR2(KTR_INTR, "%s: setrunqueue %d", __func__, p->p_pid);
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TD_CLR_IWAIT(td);
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setrunqueue(td, SRQ_INTR);
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} else {
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CTR4(KTR_INTR, "%s: pid %d: it_need %d, state %d",
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__func__, p->p_pid, ithread->it_need, td->td_state);
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}
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mtx_unlock_spin(&sched_lock);
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return (0);
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}
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int
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swi_add(struct ithd **ithdp, const char *name, driver_intr_t handler,
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void *arg, int pri, enum intr_type flags, void **cookiep)
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{
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struct ithd *ithd;
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int error;
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if (flags & (INTR_FAST | INTR_ENTROPY))
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return (EINVAL);
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ithd = (ithdp != NULL) ? *ithdp : NULL;
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if (ithd != NULL) {
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if ((ithd->it_flags & IT_SOFT) == 0)
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return(EINVAL);
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} else {
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error = ithread_create(&ithd, pri, IT_SOFT, NULL, NULL,
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"swi%d:", pri);
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if (error)
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return (error);
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if (ithdp != NULL)
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*ithdp = ithd;
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}
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return (ithread_add_handler(ithd, name, handler, arg,
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(pri * RQ_PPQ) + PI_SOFT, flags, cookiep));
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/* XXKSE.. think of a better way to get separate queues */
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}
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/*
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* Schedule a heavyweight software interrupt process.
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*/
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void
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swi_sched(void *cookie, int flags)
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{
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struct intrhand *ih = (struct intrhand *)cookie;
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struct ithd *it = ih->ih_ithread;
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int error;
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atomic_add_int(&cnt.v_intr, 1); /* one more global interrupt */
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CTR3(KTR_INTR, "swi_sched pid %d(%s) need=%d",
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it->it_td->td_proc->p_pid, it->it_td->td_proc->p_comm, it->it_need);
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/*
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* Set ih_need for this handler so that if the ithread is already
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* running it will execute this handler on the next pass. Otherwise,
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* it will execute it the next time it runs.
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*/
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atomic_store_rel_int(&ih->ih_need, 1);
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if (!(flags & SWI_DELAY)) {
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error = ithread_schedule(it);
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KASSERT(error == 0, ("stray software interrupt"));
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}
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}
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/*
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* This is the main code for interrupt threads.
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*/
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static void
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ithread_loop(void *arg)
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{
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struct ithd *ithd; /* our thread context */
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struct intrhand *ih; /* and our interrupt handler chain */
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struct thread *td;
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|
struct proc *p;
|
|
int count, warned, storming;
|
|
|
|
td = curthread;
|
|
p = td->td_proc;
|
|
ithd = (struct ithd *)arg; /* point to myself */
|
|
KASSERT(ithd->it_td == td && td->td_ithd == ithd,
|
|
("%s: ithread and proc linkage out of sync", __func__));
|
|
count = 0;
|
|
warned = 0;
|
|
storming = 0;
|
|
|
|
/*
|
|
* As long as we have interrupts outstanding, go through the
|
|
* list of handlers, giving each one a go at it.
|
|
*/
|
|
for (;;) {
|
|
/*
|
|
* If we are an orphaned thread, then just die.
|
|
*/
|
|
if (ithd->it_flags & IT_DEAD) {
|
|
CTR3(KTR_INTR, "%s: pid %d: (%s) exiting", __func__,
|
|
p->p_pid, p->p_comm);
|
|
td->td_ithd = NULL;
|
|
mtx_destroy(&ithd->it_lock);
|
|
free(ithd, M_ITHREAD);
|
|
kthread_exit(0);
|
|
}
|
|
|
|
CTR4(KTR_INTR, "%s: pid %d: (%s) need=%d", __func__,
|
|
p->p_pid, p->p_comm, ithd->it_need);
|
|
while (ithd->it_need) {
|
|
/*
|
|
* Service interrupts. If another interrupt
|
|
* arrives while we are running, they will set
|
|
* it_need to denote that we should make
|
|
* another pass.
|
|
*/
|
|
atomic_store_rel_int(&ithd->it_need, 0);
|
|
restart:
|
|
TAILQ_FOREACH(ih, &ithd->it_handlers, ih_next) {
|
|
if (ithd->it_flags & IT_SOFT && !ih->ih_need)
|
|
continue;
|
|
atomic_store_rel_int(&ih->ih_need, 0);
|
|
CTR6(KTR_INTR,
|
|
"%s: pid %d ih=%p: %p(%p) flg=%x", __func__,
|
|
p->p_pid, (void *)ih,
|
|
(void *)ih->ih_handler, ih->ih_argument,
|
|
ih->ih_flags);
|
|
|
|
if ((ih->ih_flags & IH_DEAD) != 0) {
|
|
mtx_lock(&ithd->it_lock);
|
|
TAILQ_REMOVE(&ithd->it_handlers, ih,
|
|
ih_next);
|
|
wakeup(ih);
|
|
mtx_unlock(&ithd->it_lock);
|
|
goto restart;
|
|
}
|
|
if ((ih->ih_flags & IH_MPSAFE) == 0)
|
|
mtx_lock(&Giant);
|
|
ih->ih_handler(ih->ih_argument);
|
|
if ((ih->ih_flags & IH_MPSAFE) == 0)
|
|
mtx_unlock(&Giant);
|
|
}
|
|
|
|
/*
|
|
* Interrupt storm handling:
|
|
*
|
|
* If this interrupt source is currently storming,
|
|
* then throttle it to only fire the handler once
|
|
* per clock tick.
|
|
*
|
|
* If this interrupt source is not currently
|
|
* storming, but the number of back to back
|
|
* interrupts exceeds the storm threshold, then
|
|
* enter storming mode.
|
|
*/
|
|
if (!storming && intr_storm_threshold != 0 &&
|
|
count >= intr_storm_threshold) {
|
|
if (!warned) {
|
|
printf(
|
|
"Interrupt storm detected on \"%s\"; throttling interrupt source\n",
|
|
p->p_comm);
|
|
warned = 1;
|
|
}
|
|
storming = 1;
|
|
}
|
|
if (storming)
|
|
tsleep(&count, td->td_priority, "istorm", 1);
|
|
else
|
|
count++;
|
|
|
|
if (ithd->it_enable != NULL)
|
|
ithd->it_enable(ithd->it_vector);
|
|
}
|
|
WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread");
|
|
mtx_assert(&Giant, MA_NOTOWNED);
|
|
|
|
/*
|
|
* Processed all our interrupts. Now get the sched
|
|
* lock. This may take a while and it_need may get
|
|
* set again, so we have to check it again.
|
|
*/
|
|
mtx_lock_spin(&sched_lock);
|
|
if (!ithd->it_need) {
|
|
TD_SET_IWAIT(td);
|
|
count = 0;
|
|
storming = 0;
|
|
CTR2(KTR_INTR, "%s: pid %d: done", __func__, p->p_pid);
|
|
mi_switch(SW_VOL, NULL);
|
|
CTR2(KTR_INTR, "%s: pid %d: resumed", __func__, p->p_pid);
|
|
}
|
|
mtx_unlock_spin(&sched_lock);
|
|
}
|
|
}
|
|
|
|
#ifdef DDB
|
|
/*
|
|
* Dump details about an interrupt handler
|
|
*/
|
|
static void
|
|
db_dump_intrhand(struct intrhand *ih)
|
|
{
|
|
int comma;
|
|
|
|
db_printf("\t%-10s ", ih->ih_name);
|
|
switch (ih->ih_pri) {
|
|
case PI_REALTIME:
|
|
db_printf("CLK ");
|
|
break;
|
|
case PI_AV:
|
|
db_printf("AV ");
|
|
break;
|
|
case PI_TTYHIGH:
|
|
case PI_TTYLOW:
|
|
db_printf("TTY ");
|
|
break;
|
|
case PI_TAPE:
|
|
db_printf("TAPE");
|
|
break;
|
|
case PI_NET:
|
|
db_printf("NET ");
|
|
break;
|
|
case PI_DISK:
|
|
case PI_DISKLOW:
|
|
db_printf("DISK");
|
|
break;
|
|
case PI_DULL:
|
|
db_printf("DULL");
|
|
break;
|
|
default:
|
|
if (ih->ih_pri >= PI_SOFT)
|
|
db_printf("SWI ");
|
|
else
|
|
db_printf("%4u", ih->ih_pri);
|
|
break;
|
|
}
|
|
db_printf(" ");
|
|
db_printsym((uintptr_t)ih->ih_handler, DB_STGY_PROC);
|
|
db_printf("(%p)", ih->ih_argument);
|
|
if (ih->ih_need ||
|
|
(ih->ih_flags & (IH_FAST | IH_EXCLUSIVE | IH_ENTROPY | IH_DEAD |
|
|
IH_MPSAFE)) != 0) {
|
|
db_printf(" {");
|
|
comma = 0;
|
|
if (ih->ih_flags & IH_FAST) {
|
|
db_printf("FAST");
|
|
comma = 1;
|
|
}
|
|
if (ih->ih_flags & IH_EXCLUSIVE) {
|
|
if (comma)
|
|
db_printf(", ");
|
|
db_printf("EXCL");
|
|
comma = 1;
|
|
}
|
|
if (ih->ih_flags & IH_ENTROPY) {
|
|
if (comma)
|
|
db_printf(", ");
|
|
db_printf("ENTROPY");
|
|
comma = 1;
|
|
}
|
|
if (ih->ih_flags & IH_DEAD) {
|
|
if (comma)
|
|
db_printf(", ");
|
|
db_printf("DEAD");
|
|
comma = 1;
|
|
}
|
|
if (ih->ih_flags & IH_MPSAFE) {
|
|
if (comma)
|
|
db_printf(", ");
|
|
db_printf("MPSAFE");
|
|
comma = 1;
|
|
}
|
|
if (ih->ih_need) {
|
|
if (comma)
|
|
db_printf(", ");
|
|
db_printf("NEED");
|
|
}
|
|
db_printf("}");
|
|
}
|
|
db_printf("\n");
|
|
}
|
|
|
|
/*
|
|
* Dump details about an ithread
|
|
*/
|
|
void
|
|
db_dump_ithread(struct ithd *ithd, int handlers)
|
|
{
|
|
struct proc *p;
|
|
struct intrhand *ih;
|
|
int comma;
|
|
|
|
if (ithd->it_td != NULL) {
|
|
p = ithd->it_td->td_proc;
|
|
db_printf("%s (pid %d)", p->p_comm, p->p_pid);
|
|
} else
|
|
db_printf("%s: (no thread)", ithd->it_name);
|
|
if ((ithd->it_flags & (IT_SOFT | IT_ENTROPY | IT_DEAD)) != 0 ||
|
|
ithd->it_need) {
|
|
db_printf(" {");
|
|
comma = 0;
|
|
if (ithd->it_flags & IT_SOFT) {
|
|
db_printf("SOFT");
|
|
comma = 1;
|
|
}
|
|
if (ithd->it_flags & IT_ENTROPY) {
|
|
if (comma)
|
|
db_printf(", ");
|
|
db_printf("ENTROPY");
|
|
comma = 1;
|
|
}
|
|
if (ithd->it_flags & IT_DEAD) {
|
|
if (comma)
|
|
db_printf(", ");
|
|
db_printf("DEAD");
|
|
comma = 1;
|
|
}
|
|
if (ithd->it_need) {
|
|
if (comma)
|
|
db_printf(", ");
|
|
db_printf("NEED");
|
|
}
|
|
db_printf("}");
|
|
}
|
|
db_printf("\n");
|
|
|
|
if (handlers)
|
|
TAILQ_FOREACH(ih, &ithd->it_handlers, ih_next)
|
|
db_dump_intrhand(ih);
|
|
}
|
|
#endif /* DDB */
|
|
|
|
/*
|
|
* Start standard software interrupt threads
|
|
*/
|
|
static void
|
|
start_softintr(void *dummy)
|
|
{
|
|
struct proc *p;
|
|
|
|
if (swi_add(&clk_ithd, "clock", softclock, NULL, SWI_CLOCK,
|
|
INTR_MPSAFE, &softclock_ih) ||
|
|
swi_add(NULL, "vm", swi_vm, NULL, SWI_VM, INTR_MPSAFE, &vm_ih))
|
|
panic("died while creating standard software ithreads");
|
|
|
|
p = clk_ithd->it_td->td_proc;
|
|
PROC_LOCK(p);
|
|
p->p_flag |= P_NOLOAD;
|
|
PROC_UNLOCK(p);
|
|
}
|
|
SYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr, NULL)
|
|
|
|
/*
|
|
* Sysctls used by systat and others: hw.intrnames and hw.intrcnt.
|
|
* The data for this machine dependent, and the declarations are in machine
|
|
* dependent code. The layout of intrnames and intrcnt however is machine
|
|
* independent.
|
|
*
|
|
* We do not know the length of intrcnt and intrnames at compile time, so
|
|
* calculate things at run time.
|
|
*/
|
|
static int
|
|
sysctl_intrnames(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
return (sysctl_handle_opaque(oidp, intrnames, eintrnames - intrnames,
|
|
req));
|
|
}
|
|
|
|
SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD,
|
|
NULL, 0, sysctl_intrnames, "", "Interrupt Names");
|
|
|
|
static int
|
|
sysctl_intrcnt(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
return (sysctl_handle_opaque(oidp, intrcnt,
|
|
(char *)eintrcnt - (char *)intrcnt, req));
|
|
}
|
|
|
|
SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD,
|
|
NULL, 0, sysctl_intrcnt, "", "Interrupt Counts");
|
|
|
|
#ifdef DDB
|
|
/*
|
|
* DDB command to dump the interrupt statistics.
|
|
*/
|
|
DB_SHOW_COMMAND(intrcnt, db_show_intrcnt)
|
|
{
|
|
u_long *i;
|
|
char *cp;
|
|
int quit;
|
|
|
|
cp = intrnames;
|
|
db_setup_paging(db_simple_pager, &quit, db_lines_per_page);
|
|
for (i = intrcnt, quit = 0; i != eintrcnt && !quit; i++) {
|
|
if (*cp == '\0')
|
|
break;
|
|
if (*i != 0)
|
|
db_printf("%s\t%lu\n", cp, *i);
|
|
cp += strlen(cp) + 1;
|
|
}
|
|
}
|
|
#endif
|