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: stable/12/sys/amd64/include/counter.h 355263 2019-12-01 16:02:15Z kib $
29 */
30
31 #ifndef __MACHINE_COUNTER_H__
32 #define __MACHINE_COUNTER_H__
33
34 #include <sys/pcpu.h>
35
36 #define EARLY_COUNTER &temp_bsp_pcpu.pc_early_dummy_counter
37
38 #define counter_enter() do {} while (0)
39 #define counter_exit() do {} while (0)
40
41 #ifdef IN_SUBR_COUNTER_C
42 static inline uint64_t
counter_u64_read_one(uint64_t * p,int cpu)43 counter_u64_read_one(uint64_t *p, int cpu)
44 {
45
46 return (*(uint64_t *)((char *)p + UMA_PCPU_ALLOC_SIZE * cpu));
47 }
48
49 static inline uint64_t
counter_u64_fetch_inline(uint64_t * p)50 counter_u64_fetch_inline(uint64_t *p)
51 {
52 uint64_t r;
53 int i;
54
55 r = 0;
56 CPU_FOREACH(i)
57 r += counter_u64_read_one((uint64_t *)p, i);
58
59 return (r);
60 }
61
62 static void
counter_u64_zero_one_cpu(void * arg)63 counter_u64_zero_one_cpu(void *arg)
64 {
65
66 *((uint64_t *)((char *)arg + UMA_PCPU_ALLOC_SIZE *
67 PCPU_GET(cpuid))) = 0;
68 }
69
70 static inline void
counter_u64_zero_inline(counter_u64_t c)71 counter_u64_zero_inline(counter_u64_t c)
72 {
73
74 smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu,
75 smp_no_rendezvous_barrier, c);
76 }
77 #endif
78
79 #define counter_u64_add_protected(c, i) counter_u64_add(c, i)
80
81 static inline void
counter_u64_add(counter_u64_t c,int64_t inc)82 counter_u64_add(counter_u64_t c, int64_t inc)
83 {
84
85 KASSERT(IS_BSP() || c != EARLY_COUNTER, ("EARLY_COUNTER used on AP"));
86 __asm __volatile("addq\t%1,%%gs:(%0)"
87 :
88 : "r" ((char *)c - (char *)&__pcpu[0]), "ri" (inc)
89 : "memory", "cc");
90 }
91
92 #endif /* ! __MACHINE_COUNTER_H__ */
93