1/*-
2 * Copyright (c) 2017 Mark Johnston <markj@FreeBSD.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice unmodified, this list of conditions, and the following
9 *    disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD$");
28
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/lock.h>
32#include <sys/mutex.h>
33#include <sys/time.h>
34
35#include <machine/cpu.h>
36
37#include <linux/hrtimer.h>
38
39static void
40hrtimer_call_handler(void *arg)
41{
42	struct hrtimer *hrtimer;
43	enum hrtimer_restart ret;
44
45	hrtimer = arg;
46	ret = hrtimer->function(hrtimer);
47
48	if (ret == HRTIMER_RESTART) {
49		callout_schedule_sbt(&hrtimer->callout,
50		    nstosbt(hrtimer->expires), nstosbt(hrtimer->precision), 0);
51	} else {
52		callout_deactivate(&hrtimer->callout);
53	}
54}
55
56bool
57linux_hrtimer_active(struct hrtimer *hrtimer)
58{
59	bool ret;
60
61	mtx_lock(&hrtimer->mtx);
62	ret = callout_active(&hrtimer->callout);
63	mtx_unlock(&hrtimer->mtx);
64
65	return (ret);
66}
67
68/*
69 * Cancel active hrtimer.
70 * Return 1 if timer was active and cancellation succeeded, or 0 otherwise.
71 */
72int
73linux_hrtimer_cancel(struct hrtimer *hrtimer)
74{
75
76	return (callout_drain(&hrtimer->callout) > 0);
77}
78
79void
80linux_hrtimer_init(struct hrtimer *hrtimer)
81{
82
83	memset(hrtimer, 0, sizeof(*hrtimer));
84	mtx_init(&hrtimer->mtx, "hrtimer", NULL,
85	    MTX_DEF | MTX_RECURSE | MTX_NOWITNESS);
86	callout_init_mtx(&hrtimer->callout, &hrtimer->mtx, 0);
87}
88
89void
90linux_hrtimer_set_expires(struct hrtimer *hrtimer, ktime_t time)
91{
92	hrtimer->expires = ktime_to_ns(time);
93}
94
95void
96linux_hrtimer_start(struct hrtimer *hrtimer, ktime_t time)
97{
98
99	linux_hrtimer_start_range_ns(hrtimer, time, 0);
100}
101
102void
103linux_hrtimer_start_range_ns(struct hrtimer *hrtimer, ktime_t time,
104    int64_t nsec)
105{
106
107	mtx_lock(&hrtimer->mtx);
108	hrtimer->precision = nsec;
109	callout_reset_sbt(&hrtimer->callout, nstosbt(ktime_to_ns(time)),
110	    nstosbt(nsec), hrtimer_call_handler, hrtimer, 0);
111	mtx_unlock(&hrtimer->mtx);
112}
113
114void
115linux_hrtimer_forward_now(struct hrtimer *hrtimer, ktime_t interval)
116{
117
118	mtx_lock(&hrtimer->mtx);
119	callout_reset_sbt(&hrtimer->callout, nstosbt(ktime_to_ns(interval)),
120	    nstosbt(hrtimer->precision), hrtimer_call_handler, hrtimer, 0);
121	mtx_unlock(&hrtimer->mtx);
122}
123