253 lines
6.7 KiB
C
253 lines
6.7 KiB
C
/*-
|
|
* Copyright (c) 2010 Alexander Motin <mav@FreeBSD.org>
|
|
* 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,
|
|
* without modification, immediately at the beginning of the file.
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/timeet.h>
|
|
|
|
SLIST_HEAD(et_eventtimers_list, eventtimer);
|
|
static struct et_eventtimers_list eventtimers = SLIST_HEAD_INITIALIZER(et_eventtimers);
|
|
|
|
struct mtx et_eventtimers_mtx;
|
|
MTX_SYSINIT(et_eventtimers_init, &et_eventtimers_mtx, "et_mtx", MTX_SPIN);
|
|
|
|
SYSCTL_NODE(_kern, OID_AUTO, eventtimer, CTLFLAG_RW, 0, "Event timers");
|
|
SYSCTL_NODE(_kern_eventtimer, OID_AUTO, et, CTLFLAG_RW, 0, "");
|
|
|
|
/*
|
|
* Register a new event timer hardware.
|
|
*/
|
|
int
|
|
et_register(struct eventtimer *et)
|
|
{
|
|
struct eventtimer *tmp, *next;
|
|
|
|
if (et->et_quality >= 0 || bootverbose) {
|
|
printf("Event timer \"%s\" frequency %ju Hz quality %d\n",
|
|
et->et_name, (uintmax_t)et->et_frequency,
|
|
et->et_quality);
|
|
}
|
|
et->et_sysctl = SYSCTL_ADD_NODE(NULL,
|
|
SYSCTL_STATIC_CHILDREN(_kern_eventtimer_et), OID_AUTO, et->et_name,
|
|
CTLFLAG_RW, 0, "event timer description");
|
|
SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(et->et_sysctl), OID_AUTO,
|
|
"flags", CTLFLAG_RD, &(et->et_flags), 0,
|
|
"Event timer capabilities");
|
|
SYSCTL_ADD_QUAD(NULL, SYSCTL_CHILDREN(et->et_sysctl), OID_AUTO,
|
|
"frequency", CTLFLAG_RD, &(et->et_frequency),
|
|
"Event timer base frequency");
|
|
SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(et->et_sysctl), OID_AUTO,
|
|
"quality", CTLFLAG_RD, &(et->et_quality), 0,
|
|
"Goodness of event timer");
|
|
ET_LOCK();
|
|
if (SLIST_EMPTY(&eventtimers) ||
|
|
SLIST_FIRST(&eventtimers)->et_quality < et->et_quality) {
|
|
SLIST_INSERT_HEAD(&eventtimers, et, et_all);
|
|
} else {
|
|
SLIST_FOREACH(tmp, &eventtimers, et_all) {
|
|
next = SLIST_NEXT(tmp, et_all);
|
|
if (next == NULL || next->et_quality < et->et_quality) {
|
|
SLIST_INSERT_AFTER(tmp, et, et_all);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
ET_UNLOCK();
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Deregister event timer hardware.
|
|
*/
|
|
int
|
|
et_deregister(struct eventtimer *et)
|
|
{
|
|
int err = 0;
|
|
|
|
if (et->et_deregister_cb != NULL) {
|
|
if ((err = et->et_deregister_cb(et, et->et_arg)) != 0)
|
|
return (err);
|
|
}
|
|
|
|
ET_LOCK();
|
|
SLIST_REMOVE(&eventtimers, et, eventtimer, et_all);
|
|
ET_UNLOCK();
|
|
sysctl_remove_oid(et->et_sysctl, 1, 1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Find free event timer hardware with specified parameters.
|
|
*/
|
|
struct eventtimer *
|
|
et_find(const char *name, int check, int want)
|
|
{
|
|
struct eventtimer *et = NULL;
|
|
|
|
SLIST_FOREACH(et, &eventtimers, et_all) {
|
|
if (et->et_active)
|
|
continue;
|
|
if (name != NULL && strcasecmp(et->et_name, name) != 0)
|
|
continue;
|
|
if (name == NULL && et->et_quality < 0)
|
|
continue;
|
|
if ((et->et_flags & check) != want)
|
|
continue;
|
|
break;
|
|
}
|
|
return (et);
|
|
}
|
|
|
|
/*
|
|
* Initialize event timer hardware. Set callbacks.
|
|
*/
|
|
int
|
|
et_init(struct eventtimer *et, et_event_cb_t *event,
|
|
et_deregister_cb_t *deregister, void *arg)
|
|
{
|
|
|
|
if (event == NULL)
|
|
return (EINVAL);
|
|
if (et->et_active)
|
|
return (EBUSY);
|
|
|
|
et->et_active = 1;
|
|
et->et_event_cb = event;
|
|
et->et_deregister_cb = deregister;
|
|
et->et_arg = arg;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Start event timer hardware.
|
|
* first - delay before first tick.
|
|
* period - period of subsequent periodic ticks.
|
|
*/
|
|
int
|
|
et_start(struct eventtimer *et,
|
|
struct bintime *first, struct bintime *period)
|
|
{
|
|
|
|
if (!et->et_active)
|
|
return (ENXIO);
|
|
if (first == NULL && period == NULL)
|
|
return (EINVAL);
|
|
if ((et->et_flags & ET_FLAGS_PERIODIC) == 0 &&
|
|
period != NULL)
|
|
return (ENODEV);
|
|
if ((et->et_flags & ET_FLAGS_ONESHOT) == 0 &&
|
|
period == NULL)
|
|
return (ENODEV);
|
|
if (first != NULL) {
|
|
if (first->sec < et->et_min_period.sec ||
|
|
(first->sec == et->et_min_period.sec &&
|
|
first->frac < et->et_min_period.frac))
|
|
first = &et->et_min_period;
|
|
if (first->sec > et->et_max_period.sec ||
|
|
(first->sec == et->et_max_period.sec &&
|
|
first->frac > et->et_max_period.frac))
|
|
first = &et->et_max_period;
|
|
}
|
|
if (period != NULL) {
|
|
if (period->sec < et->et_min_period.sec ||
|
|
(period->sec == et->et_min_period.sec &&
|
|
period->frac < et->et_min_period.frac))
|
|
period = &et->et_min_period;
|
|
if (period->sec > et->et_max_period.sec ||
|
|
(period->sec == et->et_max_period.sec &&
|
|
period->frac > et->et_max_period.frac))
|
|
period = &et->et_max_period;
|
|
}
|
|
if (et->et_start)
|
|
return (et->et_start(et, first, period));
|
|
return (0);
|
|
}
|
|
|
|
/* Stop event timer hardware. */
|
|
int
|
|
et_stop(struct eventtimer *et)
|
|
{
|
|
|
|
if (!et->et_active)
|
|
return (ENXIO);
|
|
if (et->et_stop)
|
|
return (et->et_stop(et));
|
|
return (0);
|
|
}
|
|
|
|
/* Mark event timer hardware as broken. */
|
|
int
|
|
et_ban(struct eventtimer *et)
|
|
{
|
|
|
|
et->et_flags &= ~(ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT);
|
|
return (0);
|
|
}
|
|
|
|
/* Free event timer hardware. */
|
|
int
|
|
et_free(struct eventtimer *et)
|
|
{
|
|
|
|
if (!et->et_active)
|
|
return (ENXIO);
|
|
|
|
et->et_active = 0;
|
|
return (0);
|
|
}
|
|
|
|
/* Report list of supported event timers hardware via sysctl. */
|
|
static int
|
|
sysctl_kern_eventtimer_choice(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
char buf[512], *spc;
|
|
struct eventtimer *et;
|
|
int error, off;
|
|
|
|
spc = "";
|
|
error = 0;
|
|
off = 0;
|
|
ET_LOCK();
|
|
SLIST_FOREACH(et, &eventtimers, et_all) {
|
|
off += snprintf(buf + off, sizeof(buf) - off, "%s%s(%d)",
|
|
spc, et->et_name, et->et_quality);
|
|
spc = " ";
|
|
}
|
|
ET_UNLOCK();
|
|
error = SYSCTL_OUT(req, buf, strlen(buf));
|
|
return (error);
|
|
}
|
|
SYSCTL_PROC(_kern_eventtimer, OID_AUTO, choice,
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
|
|
0, 0, sysctl_kern_eventtimer_choice, "A", "Present event timers");
|
|
|