1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2012, 2013 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
29#ifndef __MACHINE_COUNTER_H__
30#define __MACHINE_COUNTER_H__
31
32#include <sys/pcpu.h>
33#ifdef INVARIANTS
34#include <sys/proc.h>
35#endif
36
37#define	EARLY_COUNTER	&__pcpu[0].pc_early_dummy_counter
38
39#ifdef __powerpc64__
40
41#define	counter_enter()	do {} while (0)
42#define	counter_exit()	do {} while (0)
43
44#ifdef IN_SUBR_COUNTER_C
45static inline uint64_t
46counter_u64_read_one(uint64_t *p, int cpu)
47{
48
49	return (*(uint64_t *)((char *)p + UMA_PCPU_ALLOC_SIZE * cpu));
50}
51
52static inline uint64_t
53counter_u64_fetch_inline(uint64_t *p)
54{
55	uint64_t r;
56	int i;
57
58	r = 0;
59	CPU_FOREACH(i)
60		r += counter_u64_read_one((uint64_t *)p, i);
61
62	return (r);
63}
64
65static void
66counter_u64_zero_one_cpu(void *arg)
67{
68
69	*((uint64_t *)((char *)arg + UMA_PCPU_ALLOC_SIZE *
70	    PCPU_GET(cpuid))) = 0;
71}
72
73static inline void
74counter_u64_zero_inline(counter_u64_t c)
75{
76
77	smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu,
78	    smp_no_rendezvous_barrier, c);
79}
80#endif
81
82#define	counter_u64_add_protected(c, i)	counter_u64_add(c, i)
83
84static inline void
85counter_u64_add(counter_u64_t c, int64_t inc)
86{
87	uint64_t ccpu, old;
88
89	__asm __volatile("\n"
90      "1:\n\t"
91	    "mfsprg	%0, 0\n\t"
92	    "ldarx	%1, %0, %2\n\t"
93	    "add	%1, %1, %3\n\t"
94	    "stdcx.	%1, %0, %2\n\t"
95	    "bne-	1b"
96	    : "=&b" (ccpu), "=&r" (old)
97	    : "r" ((char *)c - (char *)&__pcpu[0]), "r" (inc)
98	    : "cr0", "memory");
99}
100
101#else	/* !64bit */
102
103#define	counter_enter()	critical_enter()
104#define	counter_exit()	critical_exit()
105
106#ifdef IN_SUBR_COUNTER_C
107/* XXXKIB non-atomic 64bit read */
108static inline uint64_t
109counter_u64_read_one(uint64_t *p, int cpu)
110{
111
112	return (*(uint64_t *)((char *)p + UMA_PCPU_ALLOC_SIZE * cpu));
113}
114
115static inline uint64_t
116counter_u64_fetch_inline(uint64_t *p)
117{
118	uint64_t r;
119	int i;
120
121	r = 0;
122	for (i = 0; i < mp_ncpus; i++)
123		r += counter_u64_read_one((uint64_t *)p, i);
124
125	return (r);
126}
127
128/* XXXKIB non-atomic 64bit store, might interrupt increment */
129static void
130counter_u64_zero_one_cpu(void *arg)
131{
132
133	*((uint64_t *)((char *)arg + UMA_PCPU_ALLOC_SIZE *
134	    PCPU_GET(cpuid))) = 0;
135}
136
137static inline void
138counter_u64_zero_inline(counter_u64_t c)
139{
140
141	smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu,
142	    smp_no_rendezvous_barrier, c);
143}
144#endif
145
146#define	counter_u64_add_protected(c, inc)	do {	\
147	CRITICAL_ASSERT(curthread);			\
148	*(uint64_t *)zpcpu_get(c) += (inc);		\
149} while (0)
150
151static inline void
152counter_u64_add(counter_u64_t c, int64_t inc)
153{
154
155	counter_enter();
156	counter_u64_add_protected(c, inc);
157	counter_exit();
158}
159
160#endif	/* 64bit */
161
162#endif	/* ! __MACHINE_COUNTER_H__ */
163