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#include <sys/systm.h>
104
105#define counter_enter() critical_enter()
106#define counter_exit() critical_exit()
107
108#ifdef IN_SUBR_COUNTER_C
109/* XXXKIB non-atomic 64bit read */
110static inline uint64_t
111counter_u64_read_one(uint64_t *p, int cpu)
112{
113
114 return (*(uint64_t *)((char *)p + UMA_PCPU_ALLOC_SIZE * cpu));
115}
116
117static inline uint64_t
118counter_u64_fetch_inline(uint64_t *p)
119{
120 uint64_t r;
121 int i;
122
123 r = 0;
124 for (i = 0; i < mp_ncpus; i++)
125 r += counter_u64_read_one((uint64_t *)p, i);
126
127 return (r);
128}
129
130/* XXXKIB non-atomic 64bit store, might interrupt increment */
131static void
132counter_u64_zero_one_cpu(void *arg)
133{
134
135 *((uint64_t *)((char *)arg + UMA_PCPU_ALLOC_SIZE *
136 PCPU_GET(cpuid))) = 0;
137}
138
139static inline void
140counter_u64_zero_inline(counter_u64_t c)
141{
142
143 smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu,
144 smp_no_rendezvous_barrier, c);
145}
146#endif
147
148#define counter_u64_add_protected(c, inc) do { \
149 CRITICAL_ASSERT(curthread); \
150 *(uint64_t *)zpcpu_get(c) += (inc); \
151} while (0)
152
153static inline void
154counter_u64_add(counter_u64_t c, int64_t inc)
155{
156
157 counter_enter();
158 counter_u64_add_protected(c, inc);
159 counter_exit();
160}
161
162#endif /* 64bit */
163
164#endif /* ! __MACHINE_COUNTER_H__ */