1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2012 Konstantin Belousov <[email protected]>
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
39 #define EARLY_COUNTER &((struct pcpu *)pcpu_space)->pc_early_dummy_counter
40
41 #define counter_enter() critical_enter()
42 #define counter_exit() critical_exit()
43
44 #ifdef IN_SUBR_COUNTER_C
45 /* XXXKIB non-atomic 64bit read on 32bit */
46 static inline uint64_t
counter_u64_read_one(uint64_t * p,int cpu)47 counter_u64_read_one(uint64_t *p, int cpu)
48 {
49
50 return (*(uint64_t *)((char *)p + UMA_PCPU_ALLOC_SIZE * cpu));
51 }
52
53 static inline uint64_t
counter_u64_fetch_inline(uint64_t * p)54 counter_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 non-atomic 64bit store on 32bit, might interrupt increment */
67 static void
counter_u64_zero_one_cpu(void * arg)68 counter_u64_zero_one_cpu(void *arg)
69 {
70
71 *((uint64_t *)((char *)arg + UMA_PCPU_ALLOC_SIZE *
72 PCPU_GET(cpuid))) = 0;
73 }
74
75 static inline void
counter_u64_zero_inline(counter_u64_t c)76 counter_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
89 static inline void
counter_u64_add(counter_u64_t c,int64_t inc)90 counter_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