158 lines
4.8 KiB
C
158 lines
4.8 KiB
C
/*-
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* Copyright (c) 1997 Berkeley Software Design, Inc. 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, this list of conditions and the following 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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* 3. Berkeley Software Design Inc's name may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From BSDI: intr.c,v 1.6.2.5 1999/07/06 19:16:52 cp Exp
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* $FreeBSD$
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*/
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/* Interrupt thread code. */
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#include "opt_auto_eoi.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/rtprio.h> /* change this name XXX */
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/syslog.h>
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#include <sys/ipl.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/unistd.h>
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#include <sys/errno.h>
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#include <sys/interrupt.h>
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#include <sys/random.h>
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#include <sys/resourcevar.h>
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#include <sys/time.h>
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#include <machine/md_var.h>
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#include <machine/segments.h>
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#include <i386/isa/icu.h>
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#include <isa/isavar.h>
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#include <i386/isa/intr_machdep.h>
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#include <sys/interrupt.h>
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#include <sys/vmmeter.h>
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#include <sys/ktr.h>
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#include <machine/cpu.h>
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struct int_entropy {
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struct proc *p;
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int irq;
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};
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static u_int straycount[NHWI];
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#define MAX_STRAY_LOG 5
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/*
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* Schedule a heavyweight interrupt process. This function is called
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* from the interrupt handlers Xintr<num>.
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*/
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void
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sched_ithd(void *cookie)
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{
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int irq = (int) cookie; /* IRQ we're handling */
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struct ithd *ir = ithds[irq]; /* and the process that does it */
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/* This used to be in icu_vector.s */
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/*
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* We count software interrupts when we process them. The
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* code here follows previous practice, but there's an
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* argument for counting hardware interrupts when they're
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* processed too.
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*/
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atomic_add_long(intr_countp[irq], 1); /* one more for this IRQ */
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atomic_add_int(&cnt.v_intr, 1); /* one more global interrupt */
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/*
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* If this interrupt is marked as being a source of entropy, use
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* the current timestamp to feed entropy to the PRNG.
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*/
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if (harvest.interrupt && ir != NULL && (ir->it_flags & IT_ENTROPY)) {
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struct int_entropy entropy;
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entropy.irq = irq;
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entropy.p = curproc;
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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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/*
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* If we don't have an interrupt resource or an interrupt thread for
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* this IRQ, log it as a stray interrupt.
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*/
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if (ir == NULL || ir->it_proc == NULL) {
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if (straycount[irq] < MAX_STRAY_LOG) {
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printf("stray irq %d\n", irq);
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if (++straycount[irq] == MAX_STRAY_LOG)
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printf(
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"got %d stray irq %d's: not logging anymore\n",
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MAX_STRAY_LOG, irq);
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}
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return;
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}
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CTR3(KTR_INTR, "sched_ithd pid %d(%s) need=%d",
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ir->it_proc->p_pid, ir->it_proc->p_comm, ir->it_need);
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/*
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* Set it_need so that if the thread is already running but close
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* to done, it will do another go-round. Then get the sched lock
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* and see if the thread is on whichkqs yet. If not, put it on
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* there. In any case, kick everyone so that if the new thread
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* is higher priority than their current thread, it gets run now.
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*/
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ir->it_need = 1;
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mtx_lock_spin(&sched_lock);
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if (ir->it_proc->p_stat == SWAIT) { /* not on run queue */
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CTR1(KTR_INTR, "sched_ithd: setrunqueue %d",
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ir->it_proc->p_pid);
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/* membar_lock(); */
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ir->it_proc->p_stat = SRUN;
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setrunqueue(ir->it_proc);
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if (!cold) {
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if (curproc != PCPU_GET(idleproc))
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setrunqueue(curproc);
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curproc->p_stats->p_ru.ru_nvcsw++;
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mi_switch();
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} else
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need_resched();
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}
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else {
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CTR3(KTR_INTR, "sched_ithd %d: it_need %d, state %d",
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ir->it_proc->p_pid,
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ir->it_need,
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ir->it_proc->p_stat );
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}
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mtx_unlock_spin(&sched_lock);
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}
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