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/10/sys/powerpc/include/counter.h 266004 2014-05-14 04:42:38Z ian $
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
43 static inline uint64_t
counter_u64_read_one(uint64_t * p,int cpu)44 counter_u64_read_one(uint64_t *p, int cpu)
45 {
46
47 return (*(uint64_t *)((char *)p + sizeof(struct pcpu) * cpu));
48 }
49
50 static inline uint64_t
counter_u64_fetch_inline(uint64_t * p)51 counter_u64_fetch_inline(uint64_t *p)
52 {
53 uint64_t r;
54 int i;
55
56 r = 0;
57 for (i = 0; i < mp_ncpus; i++)
58 r += counter_u64_read_one((uint64_t *)p, i);
59
60 return (r);
61 }
62
63 static void
counter_u64_zero_one_cpu(void * arg)64 counter_u64_zero_one_cpu(void *arg)
65 {
66
67 *((uint64_t *)((char *)arg + sizeof(struct pcpu) *
68 PCPU_GET(cpuid))) = 0;
69 }
70
71 static inline void
counter_u64_zero_inline(counter_u64_t c)72 counter_u64_zero_inline(counter_u64_t c)
73 {
74
75 smp_rendezvous(smp_no_rendevous_barrier, counter_u64_zero_one_cpu,
76 smp_no_rendevous_barrier, c);
77 }
78 #endif
79
80 #define counter_u64_add_protected(c, i) counter_u64_add(c, i)
81
82 extern struct pcpu __pcpu[MAXCPU];
83
84 static inline void
counter_u64_add(counter_u64_t c,int64_t inc)85 counter_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 : "cc", "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 */
108 static inline uint64_t
counter_u64_read_one(uint64_t * p,int cpu)109 counter_u64_read_one(uint64_t *p, int cpu)
110 {
111
112 return (*(uint64_t *)((char *)p + sizeof(struct pcpu) * cpu));
113 }
114
115 static inline uint64_t
counter_u64_fetch_inline(uint64_t * p)116 counter_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 */
129 static void
counter_u64_zero_one_cpu(void * arg)130 counter_u64_zero_one_cpu(void *arg)
131 {
132
133 *((uint64_t *)((char *)arg + sizeof(struct pcpu) *
134 PCPU_GET(cpuid))) = 0;
135 }
136
137 static inline void
counter_u64_zero_inline(counter_u64_t c)138 counter_u64_zero_inline(counter_u64_t c)
139 {
140
141 smp_rendezvous(smp_no_rendevous_barrier, counter_u64_zero_one_cpu,
142 smp_no_rendevous_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
151 static inline void
counter_u64_add(counter_u64_t c,int64_t inc)152 counter_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