d511196c02
don't take an arg, but swi_generic() is special in order to avoid one
whole conditional branch in the old SWI dispatch code. The new SWI
dispatch code passed it a garbage arg. Bypass swi_generic() and call
swi_dispatcher() directly, like the corresponding alpha code has always
done.
The panic was rare because because it only occurred if more than one
of the {sio,cy,rc} drivers was configured and one was active, and the
cy driver doesn't even compile.
357 lines
9.7 KiB
C
357 lines
9.7 KiB
C
/*-
|
|
* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Berkeley Software Design Inc's name may not be used to endorse or
|
|
* promote products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* From BSDI: intr.c,v 1.6.2.5 1999/07/06 19:16:52 cp Exp
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/* Interrupt thread code. */
|
|
|
|
#include "opt_auto_eoi.h"
|
|
|
|
#include "isa.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/rtprio.h> /* change this name XXX */
|
|
#ifndef SMP
|
|
#include <machine/lock.h>
|
|
#endif
|
|
#include <sys/proc.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/kthread.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/interrupt.h>
|
|
#include <machine/ipl.h>
|
|
#include <machine/md_var.h>
|
|
#include <machine/segments.h>
|
|
#include <sys/bus.h>
|
|
|
|
#if defined(APIC_IO)
|
|
#include <machine/smp.h>
|
|
#include <machine/smptests.h> /** FAST_HI */
|
|
#include <machine/resource.h>
|
|
#endif /* APIC_IO */
|
|
#ifdef PC98
|
|
#include <pc98/pc98/pc98.h>
|
|
#include <pc98/pc98/pc98_machdep.h>
|
|
#include <pc98/pc98/epsonio.h>
|
|
#else
|
|
#include <i386/isa/isa.h>
|
|
#endif
|
|
#include <i386/isa/icu.h>
|
|
|
|
#if NISA > 0
|
|
#include <isa/isavar.h>
|
|
#endif
|
|
#include <i386/isa/intr_machdep.h>
|
|
#include <sys/interrupt.h>
|
|
#ifdef APIC_IO
|
|
#include <machine/clock.h>
|
|
#endif
|
|
|
|
#include "mca.h"
|
|
#if NMCA > 0
|
|
#include <i386/isa/mca_machdep.h>
|
|
#endif
|
|
|
|
#include <sys/vmmeter.h>
|
|
#include <machine/mutex.h>
|
|
#include <sys/ktr.h>
|
|
#include <machine/cpu.h>
|
|
#if 0
|
|
#include <ddb/ddb.h>
|
|
#endif
|
|
|
|
u_long softintrcnt [NSWI];
|
|
|
|
SYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr, NULL)
|
|
|
|
/*
|
|
* Schedule a heavyweight interrupt process. This function is called
|
|
* from the interrupt handlers Xintr<num>.
|
|
*/
|
|
void
|
|
sched_ithd(void *cookie)
|
|
{
|
|
int irq = (int) cookie; /* IRQ we're handling */
|
|
ithd *ir = ithds[irq]; /* and the process that does it */
|
|
|
|
/* This used to be in icu_vector.s */
|
|
/*
|
|
* We count software interrupts when we process them. The
|
|
* code here follows previous practice, but there's an
|
|
* argument for counting hardware interrupts when they're
|
|
* processed too.
|
|
*/
|
|
if (irq < NHWI) /* real interrupt, */
|
|
atomic_add_long(intr_countp[irq], 1); /* one more for this IRQ */
|
|
atomic_add_int(&cnt.v_intr, 1); /* one more global interrupt */
|
|
|
|
CTR3(KTR_INTR, "sched_ithd pid %d(%s) need=%d",
|
|
ir->it_proc->p_pid, ir->it_proc->p_comm, ir->it_need);
|
|
|
|
#if 0
|
|
/*
|
|
* If we are in the debugger, we can't use interrupt threads to
|
|
* process interrupts since the threads are scheduled. Instead,
|
|
* call the interrupt handlers directly. This should be able to
|
|
* go away once we have light-weight interrupt handlers.
|
|
*/
|
|
if (db_active) {
|
|
intrec *ih; /* and our interrupt handler chain */
|
|
#if 0
|
|
membar_unlock(); /* push out "it_need=0" */
|
|
#endif
|
|
for (ih = ir->it_ih; ih != NULL; ih = ih->next) {
|
|
if ((ih->flags & INTR_MPSAFE) == 0)
|
|
mtx_enter(&Giant, MTX_DEF);
|
|
ih->handler(ih->argument);
|
|
if ((ih->flags & INTR_MPSAFE) == 0)
|
|
mtx_exit(&Giant, MTX_DEF);
|
|
}
|
|
|
|
INTREN (1 << ir->irq); /* reset the mask bit */
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Set it_need so that if the thread is already running but close
|
|
* to done, it will do another go-round. Then get the sched lock
|
|
* and see if the thread is on whichkqs yet. If not, put it on
|
|
* there. In any case, kick everyone so that if the new thread
|
|
* is higher priority than their current thread, it gets run now.
|
|
*/
|
|
ir->it_need = 1;
|
|
mtx_enter(&sched_lock, MTX_SPIN);
|
|
if (ir->it_proc->p_stat == SWAIT) { /* not on run queue */
|
|
CTR1(KTR_INTR, "sched_ithd: setrunqueue %d",
|
|
ir->it_proc->p_pid);
|
|
/* membar_lock(); */
|
|
ir->it_proc->p_stat = SRUN;
|
|
setrunqueue(ir->it_proc);
|
|
aston();
|
|
}
|
|
else {
|
|
if (irq < NHWI && (irq & 7) != 0)
|
|
CTR3(KTR_INTR, "sched_ithd %d: it_need %d, state %d",
|
|
ir->it_proc->p_pid,
|
|
ir->it_need,
|
|
ir->it_proc->p_stat );
|
|
}
|
|
mtx_exit(&sched_lock, MTX_SPIN);
|
|
#if 0
|
|
aston(); /* ??? check priorities first? */
|
|
#else
|
|
need_resched();
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* This is the main code for all interrupt threads. It gets put on
|
|
* whichkqs by setrunqueue above.
|
|
*/
|
|
void
|
|
ithd_loop(void *dummy)
|
|
{
|
|
ithd *me; /* our thread context */
|
|
intrec *ih; /* and our interrupt handler chain */
|
|
|
|
me = curproc->p_ithd; /* point to myself */
|
|
|
|
/*
|
|
* As long as we have interrupts outstanding, go through the
|
|
* list of handlers, giving each one a go at it.
|
|
*/
|
|
for (;;) {
|
|
CTR3(KTR_INTR, "ithd_loop pid %d(%s) need=%d",
|
|
me->it_proc->p_pid, me->it_proc->p_comm, me->it_need);
|
|
while (me->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.
|
|
*/
|
|
me->it_need = 0;
|
|
#if 0
|
|
membar_unlock(); /* push out "it_need=0" */
|
|
#endif
|
|
for (ih = me->it_ih; ih != NULL; ih = ih->next) {
|
|
CTR5(KTR_INTR,
|
|
"ithd_loop pid %d ih=%p: %p(%p) flg=%x",
|
|
me->it_proc->p_pid, (void *)ih,
|
|
(void *)ih->handler, ih->argument,
|
|
ih->flags);
|
|
|
|
if ((ih->flags & INTR_MPSAFE) == 0)
|
|
mtx_enter(&Giant, MTX_DEF);
|
|
ih->handler(ih->argument);
|
|
if ((ih->flags & INTR_MPSAFE) == 0)
|
|
mtx_exit(&Giant, MTX_DEF);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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_enter(&sched_lock, MTX_SPIN);
|
|
if (!me->it_need) {
|
|
|
|
INTREN (1 << me->irq); /* reset the mask bit */
|
|
me->it_proc->p_stat = SWAIT; /* we're idle */
|
|
#ifdef APIC_IO
|
|
CTR1(KTR_INTR, "ithd_loop pid %d: done",
|
|
me->it_proc->p_pid);
|
|
#else
|
|
CTR2(KTR_INTR, "ithd_loop pid %d: done, imen=%x",
|
|
me->it_proc->p_pid, imen);
|
|
#endif
|
|
mi_switch();
|
|
CTR1(KTR_INTR, "ithd_loop pid %d: resumed",
|
|
me->it_proc->p_pid);
|
|
}
|
|
mtx_exit(&sched_lock, MTX_SPIN);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Start soft interrupt thread.
|
|
*/
|
|
void
|
|
start_softintr(void *dummy)
|
|
{
|
|
int error;
|
|
struct proc *p;
|
|
ithd *softintr; /* descriptor for the "IRQ" */
|
|
intrec *idesc; /* descriptor for this handler */
|
|
char *name = "sintr"; /* name for idesc */
|
|
int i;
|
|
|
|
if (ithds[SOFTINTR]) { /* we already have a thread */
|
|
printf("start_softintr: already running");
|
|
return;
|
|
}
|
|
/* first handler for this irq. */
|
|
softintr = malloc(sizeof (struct ithd), M_DEVBUF, M_WAITOK);
|
|
if (softintr == NULL)
|
|
panic ("Can't create soft interrupt thread");
|
|
bzero(softintr, sizeof(struct ithd));
|
|
softintr->irq = SOFTINTR;
|
|
ithds[SOFTINTR] = softintr;
|
|
error = kthread_create(intr_soft, NULL, &p,
|
|
RFSTOPPED | RFHIGHPID, "softinterrupt");
|
|
if (error)
|
|
panic("start_softintr: kthread_create error %d\n", error);
|
|
|
|
p->p_rtprio.type = RTP_PRIO_ITHREAD;
|
|
p->p_rtprio.prio = PI_SOFT; /* soft interrupt */
|
|
p->p_stat = SWAIT; /* we're idle */
|
|
|
|
/* Put in linkages. */
|
|
softintr->it_proc = p;
|
|
p->p_ithd = softintr; /* reverse link */
|
|
|
|
idesc = malloc(sizeof (struct intrec), M_DEVBUF, M_WAITOK);
|
|
if (idesc == NULL)
|
|
panic ("Can't create soft interrupt thread");
|
|
bzero(idesc, sizeof (struct intrec));
|
|
|
|
idesc->ithd = softintr;
|
|
idesc->name = malloc(strlen(name) + 1, M_DEVBUF, M_WAITOK);
|
|
if (idesc->name == NULL)
|
|
panic ("Can't create soft interrupt thread");
|
|
strcpy(idesc->name, name);
|
|
for (i = NHWI; i < NHWI + NSWI; i++)
|
|
intr_countp[i] = &softintrcnt [i - NHWI];
|
|
}
|
|
|
|
/*
|
|
* Software interrupt process code.
|
|
*/
|
|
void
|
|
intr_soft(void *dummy)
|
|
{
|
|
int i;
|
|
ithd *me; /* our thread context */
|
|
|
|
me = curproc->p_ithd; /* point to myself */
|
|
|
|
/* Main loop */
|
|
for (;;) {
|
|
#if 0
|
|
CTR3(KTR_INTR, "intr_soft pid %d(%s) need=%d",
|
|
me->it_proc->p_pid, me->it_proc->p_comm,
|
|
me->it_need);
|
|
#endif
|
|
|
|
/*
|
|
* Service interrupts. If another interrupt arrives
|
|
* while we are running, they will set it_need to
|
|
* denote that we should make another pass.
|
|
*/
|
|
me->it_need = 0;
|
|
while ((i = ffs(spending))) {
|
|
i--;
|
|
atomic_add_long(intr_countp[i], 1);
|
|
spending &= ~ (1 << i);
|
|
mtx_enter(&Giant, MTX_DEF);
|
|
if (ihandlers[i] == swi_generic)
|
|
swi_dispatcher(i);
|
|
else
|
|
(ihandlers[i])();
|
|
mtx_exit(&Giant, MTX_DEF);
|
|
}
|
|
/*
|
|
* 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_enter(&sched_lock, MTX_SPIN);
|
|
if (!me->it_need) {
|
|
#if 0
|
|
CTR1(KTR_INTR, "intr_soft pid %d: done",
|
|
me->it_proc->p_pid);
|
|
#endif
|
|
me->it_proc->p_stat = SWAIT; /* we're idle */
|
|
mi_switch();
|
|
#if 0
|
|
CTR1(KTR_INTR, "intr_soft pid %d: resumed",
|
|
me->it_proc->p_pid);
|
|
#endif
|
|
}
|
|
mtx_exit(&sched_lock, MTX_SPIN);
|
|
}
|
|
}
|