1/*-
2 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following 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 AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/lock.h>
34#include <sys/mutex.h>
35#include <sys/proc.h>
36#include <sys/sched.h>
37#include <sys/smp.h>
38#include <sys/sysctl.h>
39#include <vm/uma.h>
40
41#define IN_SUBR_COUNTER_C
42#include <sys/counter.h>
43
44void
45counter_u64_zero(counter_u64_t c)
46{
47
48	counter_u64_zero_inline(c);
49}
50
51uint64_t
52counter_u64_fetch(counter_u64_t c)
53{
54
55	return (counter_u64_fetch_inline(c));
56}
57
58counter_u64_t
59counter_u64_alloc(int flags)
60{
61	counter_u64_t r;
62
63	r = uma_zalloc(pcpu_zone_64, flags);
64	if (r != NULL)
65		counter_u64_zero(r);
66
67	return (r);
68}
69
70void
71counter_u64_free(counter_u64_t c)
72{
73
74	uma_zfree(pcpu_zone_64, c);
75}
76
77int
78sysctl_handle_counter_u64(SYSCTL_HANDLER_ARGS)
79{
80	uint64_t out;
81	int error;
82
83	out = counter_u64_fetch(*(counter_u64_t *)arg1);
84
85	error = SYSCTL_OUT(req, &out, sizeof(uint64_t));
86
87	if (error || !req->newptr)
88		return (error);
89
90	/*
91	 * Any write attempt to a counter zeroes it.
92	 */
93	counter_u64_zero(*(counter_u64_t *)arg1);
94
95	return (0);
96}
97
98int
99sysctl_handle_counter_u64_array(SYSCTL_HANDLER_ARGS)
100{
101	uint64_t *out;
102	int error;
103
104	out = malloc(arg2 * sizeof(uint64_t), M_TEMP, M_WAITOK);
105	for (int i = 0; i < arg2; i++)
106		out[i] = counter_u64_fetch(((counter_u64_t *)arg1)[i]);
107
108	error = SYSCTL_OUT(req, out, arg2 * sizeof(uint64_t));
109	free(out, M_TEMP);
110
111	if (error || !req->newptr)
112		return (error);
113
114	/*
115	 * Any write attempt to a counter zeroes it.
116	 */
117	for (int i = 0; i < arg2; i++)
118		counter_u64_zero(((counter_u64_t *)arg1)[i]);
119
120	return (0);
121}
122