247 lines
6.6 KiB
C
247 lines
6.6 KiB
C
/*-
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* Copyright (c) 2010-2013 Alexander Motin <mav@FreeBSD.org>
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* 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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* without modification, immediately at the beginning of the file.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/queue.h>
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#include <sys/timeet.h>
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SLIST_HEAD(et_eventtimers_list, eventtimer);
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static struct et_eventtimers_list eventtimers = SLIST_HEAD_INITIALIZER(et_eventtimers);
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struct mtx et_eventtimers_mtx;
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MTX_SYSINIT(et_eventtimers_init, &et_eventtimers_mtx, "et_mtx", MTX_DEF);
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SYSCTL_NODE(_kern, OID_AUTO, eventtimer, CTLFLAG_RW, 0, "Event timers");
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static SYSCTL_NODE(_kern_eventtimer, OID_AUTO, et, CTLFLAG_RW, 0, "");
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/*
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* Register a new event timer hardware.
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*/
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int
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et_register(struct eventtimer *et)
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{
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struct eventtimer *tmp, *next;
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if (et->et_quality >= 0 || bootverbose) {
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if (et->et_frequency == 0) {
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printf("Event timer \"%s\" quality %d\n",
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et->et_name, et->et_quality);
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} else {
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printf("Event timer \"%s\" "
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"frequency %ju Hz quality %d\n",
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et->et_name, (uintmax_t)et->et_frequency,
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et->et_quality);
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}
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}
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KASSERT(et->et_start, ("et_register: timer has no start function"));
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et->et_sysctl = SYSCTL_ADD_NODE(NULL,
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SYSCTL_STATIC_CHILDREN(_kern_eventtimer_et), OID_AUTO, et->et_name,
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CTLFLAG_RW, 0, "event timer description");
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(et->et_sysctl), OID_AUTO,
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"flags", CTLFLAG_RD, &(et->et_flags), 0,
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"Event timer capabilities");
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SYSCTL_ADD_UQUAD(NULL, SYSCTL_CHILDREN(et->et_sysctl), OID_AUTO,
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"frequency", CTLFLAG_RD, &(et->et_frequency),
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"Event timer base frequency");
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(et->et_sysctl), OID_AUTO,
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"quality", CTLFLAG_RD, &(et->et_quality), 0,
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"Goodness of event timer");
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ET_LOCK();
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if (SLIST_EMPTY(&eventtimers) ||
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SLIST_FIRST(&eventtimers)->et_quality < et->et_quality) {
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SLIST_INSERT_HEAD(&eventtimers, et, et_all);
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} else {
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SLIST_FOREACH(tmp, &eventtimers, et_all) {
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next = SLIST_NEXT(tmp, et_all);
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if (next == NULL || next->et_quality < et->et_quality) {
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SLIST_INSERT_AFTER(tmp, et, et_all);
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break;
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}
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}
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}
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ET_UNLOCK();
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return (0);
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}
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/*
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* Deregister event timer hardware.
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*/
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int
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et_deregister(struct eventtimer *et)
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{
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int err = 0;
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if (et->et_deregister_cb != NULL) {
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if ((err = et->et_deregister_cb(et, et->et_arg)) != 0)
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return (err);
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}
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ET_LOCK();
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SLIST_REMOVE(&eventtimers, et, eventtimer, et_all);
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ET_UNLOCK();
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sysctl_remove_oid(et->et_sysctl, 1, 1);
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return (0);
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}
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/*
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* Find free event timer hardware with specified parameters.
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*/
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struct eventtimer *
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et_find(const char *name, int check, int want)
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{
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struct eventtimer *et = NULL;
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SLIST_FOREACH(et, &eventtimers, et_all) {
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if (et->et_active)
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continue;
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if (name != NULL && strcasecmp(et->et_name, name) != 0)
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continue;
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if (name == NULL && et->et_quality < 0)
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continue;
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if ((et->et_flags & check) != want)
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continue;
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break;
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}
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return (et);
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}
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/*
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* Initialize event timer hardware. Set callbacks.
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*/
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int
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et_init(struct eventtimer *et, et_event_cb_t *event,
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et_deregister_cb_t *deregister, void *arg)
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{
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if (event == NULL)
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return (EINVAL);
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if (et->et_active)
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return (EBUSY);
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et->et_active = 1;
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et->et_event_cb = event;
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et->et_deregister_cb = deregister;
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et->et_arg = arg;
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return (0);
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}
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/*
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* Start event timer hardware.
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* first - delay before first tick.
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* period - period of subsequent periodic ticks.
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*/
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int
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et_start(struct eventtimer *et, sbintime_t first, sbintime_t period)
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{
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if (!et->et_active)
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return (ENXIO);
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KASSERT(period >= 0, ("et_start: negative period"));
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KASSERT((et->et_flags & ET_FLAGS_PERIODIC) || period == 0,
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("et_start: period specified for oneshot-only timer"));
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KASSERT((et->et_flags & ET_FLAGS_ONESHOT) || period != 0,
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("et_start: period not specified for periodic-only timer"));
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if (period != 0) {
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if (period < et->et_min_period)
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period = et->et_min_period;
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else if (period > et->et_max_period)
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period = et->et_max_period;
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}
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if (period == 0 || first != 0) {
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if (first < et->et_min_period)
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first = et->et_min_period;
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else if (first > et->et_max_period)
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first = et->et_max_period;
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}
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return (et->et_start(et, first, period));
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}
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/* Stop event timer hardware. */
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int
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et_stop(struct eventtimer *et)
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{
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if (!et->et_active)
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return (ENXIO);
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if (et->et_stop)
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return (et->et_stop(et));
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return (0);
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}
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/* Mark event timer hardware as broken. */
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int
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et_ban(struct eventtimer *et)
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{
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et->et_flags &= ~(ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT);
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return (0);
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}
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/* Free event timer hardware. */
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int
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et_free(struct eventtimer *et)
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{
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if (!et->et_active)
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return (ENXIO);
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et->et_active = 0;
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return (0);
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}
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/* Report list of supported event timers hardware via sysctl. */
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static int
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sysctl_kern_eventtimer_choice(SYSCTL_HANDLER_ARGS)
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{
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char buf[512], *spc;
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struct eventtimer *et;
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int error, off;
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spc = "";
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error = 0;
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buf[0] = 0;
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off = 0;
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ET_LOCK();
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SLIST_FOREACH(et, &eventtimers, et_all) {
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off += snprintf(buf + off, sizeof(buf) - off, "%s%s(%d)",
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spc, et->et_name, et->et_quality);
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spc = " ";
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}
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ET_UNLOCK();
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error = SYSCTL_OUT(req, buf, strlen(buf));
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return (error);
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}
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SYSCTL_PROC(_kern_eventtimer, OID_AUTO, choice,
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CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
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0, 0, sysctl_kern_eventtimer_choice, "A", "Present event timers");
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