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/* $OpenBSD: softintr.c,v 1.5 2014/12/24 22:48:27 miod Exp $ */
/* $NetBSD: softintr.c,v 1.2 2003/07/15 00:24:39 lukem Exp $ */
/*
* Copyright (c) 2001 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, 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 WASABI SYSTEMS, 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.
*/
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <uvm/uvm_extern.h>
#include <machine/atomic.h>
#include <machine/intr.h>
struct soft_intrq soft_intrq[SI_NQUEUES];
/*
* Initialize the software interrupt system.
*/
void
softintr_init(void)
{
struct soft_intrq *siq;
int i;
for (i = 0; i < SI_NQUEUES; i++) {
siq = &soft_intrq[i];
TAILQ_INIT(&siq->siq_list);
siq->siq_si = i;
mtx_init(&siq->siq_mtx, IPL_HIGH);
}
}
/*
* Process pending software interrupts on the specified queue.
*
* NOTE: We must already be at the correct interrupt priority level.
*/
void
softintr_dispatch(int si)
{
struct soft_intrq *siq = &soft_intrq[si];
struct soft_intrhand *sih;
for (;;) {
mtx_enter(&siq->siq_mtx);
sih = TAILQ_FIRST(&siq->siq_list);
if (sih == NULL) {
mtx_leave(&siq->siq_mtx);
break;
}
TAILQ_REMOVE(&siq->siq_list, sih, sih_list);
sih->sih_pending = 0;
uvmexp.softs++;
mtx_leave(&siq->siq_mtx);
(*sih->sih_func)(sih->sih_arg);
}
}
/*
* Register a software interrupt handler.
*/
void *
softintr_establish(int ipl, void (*func)(void *), void *arg)
{
struct soft_intrhand *sih;
int si;
switch (ipl) {
case IPL_SOFT:
si = SI_SOFT;
break;
case IPL_SOFTCLOCK:
si = SI_SOFTCLOCK;
break;
case IPL_SOFTNET:
si = SI_SOFTNET;
break;
case IPL_SOFTTTY:
si = SI_SOFTTTY;
break;
default:
printf("softintr_establish: unknown soft IPL %d\n", ipl);
return NULL;
}
sih = malloc(sizeof(*sih), M_DEVBUF, M_NOWAIT);
if (__predict_true(sih != NULL)) {
sih->sih_func = func;
sih->sih_arg = arg;
sih->sih_siq = &soft_intrq[si];
sih->sih_pending = 0;
}
return (sih);
}
/*
* Unregister a software interrupt handler.
*/
void
softintr_disestablish(void *arg)
{
struct soft_intrhand *sih = arg;
struct soft_intrq *siq = sih->sih_siq;
mtx_enter(&siq->siq_mtx);
if (sih->sih_pending) {
TAILQ_REMOVE(&siq->siq_list, sih, sih_list);
sih->sih_pending = 0;
}
mtx_leave(&siq->siq_mtx);
free(sih, M_DEVBUF, sizeof(*sih));
}
/*
* Schedule a software interrupt.
*/
void
softintr_schedule(void *arg)
{
struct soft_intrhand *sih = (struct soft_intrhand *)arg;
struct soft_intrq *siq = sih->sih_siq;
mtx_enter(&siq->siq_mtx);
if (sih->sih_pending == 0) {
TAILQ_INSERT_TAIL(&siq->siq_list, sih, sih_list);
sih->sih_pending = 1;
atomic_setbits_int(&softpending, 1 << siq->siq_si);
}
mtx_leave(&siq->siq_mtx);
}
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