1/*-
2 * Copyright (c) 2012, 2013 Konstantin Belousov <kib@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/11/sys/powerpc/include/counter.h 328386 2018-01-25 02:45:21Z pkelsey $
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#ifdef __powerpc64__
38
39#define	counter_enter()	do {} while (0)
40#define	counter_exit()	do {} while (0)
41
42#ifdef IN_SUBR_COUNTER_C
43static inline uint64_t
44counter_u64_read_one(uint64_t *p, int cpu)
45{
46
47	return (*(uint64_t *)((char *)p + sizeof(struct pcpu) * cpu));
48}
49
50static inline uint64_t
51counter_u64_fetch_inline(uint64_t *p)
52{
53	uint64_t r;
54	int i;
55
56	r = 0;
57	CPU_FOREACH(i)
58		r += counter_u64_read_one((uint64_t *)p, i);
59
60	return (r);
61}
62
63static void
64counter_u64_zero_one_cpu(void *arg)
65{
66
67	*((uint64_t *)((char *)arg + sizeof(struct pcpu) *
68	    PCPU_GET(cpuid))) = 0;
69}
70
71static inline void
72counter_u64_zero_inline(counter_u64_t c)
73{
74
75	smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu,
76	    smp_no_rendezvous_barrier, c);
77}
78#endif
79
80#define	counter_u64_add_protected(c, i)	counter_u64_add(c, i)
81
82extern struct pcpu __pcpu[MAXCPU];
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 + sizeof(struct pcpu) * 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 + sizeof(struct pcpu) *
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