2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2012, 2013 Konstantin Belousov <kib@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
31 #ifndef __MACHINE_COUNTER_H__
32 #define __MACHINE_COUNTER_H__
39 #define EARLY_COUNTER &__pcpu[0].pc_early_dummy_counter
43 #define counter_enter() do {} while (0)
44 #define counter_exit() do {} while (0)
46 #ifdef IN_SUBR_COUNTER_C
47 static inline uint64_t
48 counter_u64_read_one(uint64_t *p, int cpu)
51 return (*(uint64_t *)((char *)p + UMA_PCPU_ALLOC_SIZE * cpu));
54 static inline uint64_t
55 counter_u64_fetch_inline(uint64_t *p)
62 r += counter_u64_read_one((uint64_t *)p, i);
68 counter_u64_zero_one_cpu(void *arg)
71 *((uint64_t *)((char *)arg + UMA_PCPU_ALLOC_SIZE *
72 PCPU_GET(cpuid))) = 0;
76 counter_u64_zero_inline(counter_u64_t c)
79 smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu,
80 smp_no_rendezvous_barrier, c);
84 #define counter_u64_add_protected(c, i) counter_u64_add(c, i)
87 counter_u64_add(counter_u64_t c, int64_t inc)
94 "ldarx %1, %0, %2\n\t"
96 "stdcx. %1, %0, %2\n\t"
98 : "=&b" (ccpu), "=&r" (old)
99 : "r" ((char *)c - (char *)&__pcpu[0]), "r" (inc)
105 #define counter_enter() critical_enter()
106 #define counter_exit() critical_exit()
108 #ifdef IN_SUBR_COUNTER_C
109 /* XXXKIB non-atomic 64bit read */
110 static inline uint64_t
111 counter_u64_read_one(uint64_t *p, int cpu)
114 return (*(uint64_t *)((char *)p + UMA_PCPU_ALLOC_SIZE * cpu));
117 static inline uint64_t
118 counter_u64_fetch_inline(uint64_t *p)
124 for (i = 0; i < mp_ncpus; i++)
125 r += counter_u64_read_one((uint64_t *)p, i);
130 /* XXXKIB non-atomic 64bit store, might interrupt increment */
132 counter_u64_zero_one_cpu(void *arg)
135 *((uint64_t *)((char *)arg + UMA_PCPU_ALLOC_SIZE *
136 PCPU_GET(cpuid))) = 0;
140 counter_u64_zero_inline(counter_u64_t c)
143 smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu,
144 smp_no_rendezvous_barrier, c);
148 #define counter_u64_add_protected(c, inc) do { \
149 CRITICAL_ASSERT(curthread); \
150 *(uint64_t *)zpcpu_get(c) += (inc); \
154 counter_u64_add(counter_u64_t c, int64_t inc)
158 counter_u64_add_protected(c, inc);
164 #endif /* ! __MACHINE_COUNTER_H__ */