1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31#ifndef __MACHINE_COUNTER_H__
32#define __MACHINE_COUNTER_H__
33
34#include <sys/pcpu.h>
35#ifdef INVARIANTS
36#include <sys/proc.h>
37#endif
38
39extern struct pcpu dummy_pcpu[];
40#define	EARLY_COUNTER	&dummy_pcpu[0].pc_early_dummy_counter
41
42#define	counter_enter()	critical_enter()
43#define	counter_exit()	critical_exit()
44
45#ifdef IN_SUBR_COUNTER_C
46static inline uint64_t
47counter_u64_read_one(uint64_t *p, int cpu)
48{
49
50	return (*(uint64_t *)((char *)p + UMA_PCPU_ALLOC_SIZE * cpu));
51}
52
53static inline uint64_t
54counter_u64_fetch_inline(uint64_t *p)
55{
56	uint64_t r;
57	int i;
58
59	r = 0;
60	for (i = 0; i < mp_ncpus; i++)
61		r += counter_u64_read_one((uint64_t *)p, i);
62
63	return (r);
64}
65
66/* XXXKIB might interrupt increment */
67static void
68counter_u64_zero_one_cpu(void *arg)
69{
70
71	*((uint64_t *)((char *)arg + UMA_PCPU_ALLOC_SIZE *
72	    PCPU_GET(cpuid))) = 0;
73}
74
75static inline void
76counter_u64_zero_inline(counter_u64_t c)
77{
78
79	smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu,
80	    smp_no_rendezvous_barrier, c);
81}
82#endif
83
84#define	counter_u64_add_protected(c, inc)	do {	\
85	CRITICAL_ASSERT(curthread);			\
86	*(uint64_t *)zpcpu_get(c) += (inc);		\
87} while (0)
88
89static inline void
90counter_u64_add(counter_u64_t c, int64_t inc)
91{
92
93	counter_enter();
94	counter_u64_add_protected(c, inc);
95	counter_exit();
96}
97
98#endif	/* ! __MACHINE_COUNTER_H__ */
99