3e5da75445
scheduling an interrupt thread to run when needed. This has the side effect of enabling support for entropy gathering from interrupts on all architectures. - Change the software interrupt and x86 and alpha hardware interrupt code to use ithread_schedule() for most of their processing when scheduling an interrupt to run. - Remove the pesky Warning message about interrupt threads having entropy enabled. I'm not sure why I put that in there in the first place. - Add more error checking for parameters and change some cases that returned EINVAL to panic on failure instead via KASSERT(). - Instead of doing a documented evil hack of setting the P_NOLOAD flag on every interrupt thread whose pri was SWI_CLOCK, set the flag explicity for clk_ithd's proc during start_softintr().
113 lines
3.5 KiB
C
113 lines
3.5 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 <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 *ithd = ithds[irq]; /* and the process that does it */
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int error;
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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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* Schedule the interrupt thread to run if needed and switch to it
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* if we schedule it if !cold.
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*/
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error = ithread_schedule(ithd, !cold);
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/*
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* Log stray interrupts.
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*/
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if (error == EINVAL)
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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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}
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