5ee171d264
Also, while here, run up to 32 interrupt sources on APIC systems. Normalize INTREN/INTRDIS so they are the same on both UP and SMP systems rather than sometimes a macro, and sometimes a function. Reviewed by: jhb, jakeb
219 lines
6.5 KiB
C
219 lines
6.5 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 <sys/param.h>
|
|
#include <sys/bus.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/ipl.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/kthread.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/interrupt.h>
|
|
#include <machine/md_var.h>
|
|
#include <machine/segments.h>
|
|
|
|
#include <i386/isa/icu.h>
|
|
|
|
#include <isa/isavar.h>
|
|
#include <i386/isa/intr_machdep.h>
|
|
#include <sys/interrupt.h>
|
|
|
|
#include <sys/vmmeter.h>
|
|
#include <sys/ktr.h>
|
|
#include <machine/cpu.h>
|
|
|
|
static u_int straycount[NHWI];
|
|
|
|
#define MAX_STRAY_LOG 5
|
|
|
|
/*
|
|
* 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 */
|
|
struct 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.
|
|
*/
|
|
atomic_add_long(intr_countp[irq], 1); /* one more for this IRQ */
|
|
atomic_add_int(&cnt.v_intr, 1); /* one more global interrupt */
|
|
|
|
/*
|
|
* If we don't have an interrupt resource or an interrupt thread for
|
|
* this IRQ, log it as a stray interrupt.
|
|
*/
|
|
if (ir == NULL || ir->it_proc == NULL) {
|
|
if (straycount[irq] < MAX_STRAY_LOG) {
|
|
printf("stray irq %d\n", irq);
|
|
if (++straycount[irq] == MAX_STRAY_LOG)
|
|
printf(
|
|
"got %d stray irq %d's: not logging anymore\n",
|
|
MAX_STRAY_LOG, irq);
|
|
}
|
|
return;
|
|
}
|
|
|
|
CTR3(KTR_INTR, "sched_ithd pid %d(%s) need=%d",
|
|
ir->it_proc->p_pid, ir->it_proc->p_comm, ir->it_need);
|
|
|
|
/*
|
|
* 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 {
|
|
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);
|
|
need_resched();
|
|
}
|
|
|
|
/*
|
|
* This is the main code for all interrupt threads. It gets put on
|
|
* whichkqs by setrunqueue above.
|
|
*/
|
|
void
|
|
ithd_loop(void *dummy)
|
|
{
|
|
struct ithd *me; /* our thread context */
|
|
struct intrhand *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 (;;) {
|
|
/*
|
|
* If we don't have any handlers, then we are an orphaned
|
|
* thread and just need to die.
|
|
*/
|
|
if (me->it_ih == NULL) {
|
|
CTR2(KTR_INTR, "ithd_loop pid %d(%s) exiting",
|
|
me->it_proc->p_pid, me->it_proc->p_comm);
|
|
curproc->p_ithd = NULL;
|
|
free(me, M_DEVBUF);
|
|
mtx_enter(&Giant, MTX_DEF);
|
|
kthread_exit(0);
|
|
}
|
|
|
|
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->ih_next) {
|
|
CTR5(KTR_INTR,
|
|
"ithd_loop pid %d ih=%p: %p(%p) flg=%x",
|
|
me->it_proc->p_pid, (void *)ih,
|
|
(void *)ih->ih_handler, ih->ih_argument,
|
|
ih->ih_flags);
|
|
|
|
if ((ih->ih_flags & INTR_MPSAFE) == 0)
|
|
mtx_enter(&Giant, MTX_DEF);
|
|
ih->ih_handler(ih->ih_argument);
|
|
if ((ih->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_assert(&Giant, MA_NOTOWNED);
|
|
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
|
|
CTR2(KTR_INTR, "ithd_loop pid %d: done, apic_imen=%x",
|
|
me->it_proc->p_pid, apic_imen);
|
|
#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);
|
|
}
|
|
}
|