xref: /freebsd/sys/powerpc/include/counter.h (revision 7c1b51d6dc2e165ae7333373513b080f17cf79bd)
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  * $FreeBSD$
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 extern struct pcpu __pcpu[];
38 
39 #define	EARLY_COUNTER	&__pcpu[0].pc_early_dummy_counter
40 
41 #ifdef __powerpc64__
42 
43 #define	counter_enter()	do {} while (0)
44 #define	counter_exit()	do {} while (0)
45 
46 #ifdef IN_SUBR_COUNTER_C
47 static inline uint64_t
48 counter_u64_read_one(uint64_t *p, int cpu)
49 {
50 
51 	return (*(uint64_t *)((char *)p + sizeof(struct pcpu) * cpu));
52 }
53 
54 static inline uint64_t
55 counter_u64_fetch_inline(uint64_t *p)
56 {
57 	uint64_t r;
58 	int i;
59 
60 	r = 0;
61 	CPU_FOREACH(i)
62 		r += counter_u64_read_one((uint64_t *)p, i);
63 
64 	return (r);
65 }
66 
67 static void
68 counter_u64_zero_one_cpu(void *arg)
69 {
70 
71 	*((uint64_t *)((char *)arg + sizeof(struct pcpu) *
72 	    PCPU_GET(cpuid))) = 0;
73 }
74 
75 static inline void
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, i)	counter_u64_add(c, i)
85 
86 static inline void
87 counter_u64_add(counter_u64_t c, int64_t inc)
88 {
89 	uint64_t ccpu, old;
90 
91 	__asm __volatile("\n"
92       "1:\n\t"
93 	    "mfsprg	%0, 0\n\t"
94 	    "ldarx	%1, %0, %2\n\t"
95 	    "add	%1, %1, %3\n\t"
96 	    "stdcx.	%1, %0, %2\n\t"
97 	    "bne-	1b"
98 	    : "=&b" (ccpu), "=&r" (old)
99 	    : "r" ((char *)c - (char *)&__pcpu[0]), "r" (inc)
100 	    : "cr0", "memory");
101 }
102 
103 #else	/* !64bit */
104 
105 #define	counter_enter()	critical_enter()
106 #define	counter_exit()	critical_exit()
107 
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)
112 {
113 
114 	return (*(uint64_t *)((char *)p + sizeof(struct pcpu) * cpu));
115 }
116 
117 static inline uint64_t
118 counter_u64_fetch_inline(uint64_t *p)
119 {
120 	uint64_t r;
121 	int i;
122 
123 	r = 0;
124 	for (i = 0; i < mp_ncpus; i++)
125 		r += counter_u64_read_one((uint64_t *)p, i);
126 
127 	return (r);
128 }
129 
130 /* XXXKIB non-atomic 64bit store, might interrupt increment */
131 static void
132 counter_u64_zero_one_cpu(void *arg)
133 {
134 
135 	*((uint64_t *)((char *)arg + sizeof(struct pcpu) *
136 	    PCPU_GET(cpuid))) = 0;
137 }
138 
139 static inline void
140 counter_u64_zero_inline(counter_u64_t c)
141 {
142 
143 	smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu,
144 	    smp_no_rendezvous_barrier, c);
145 }
146 #endif
147 
148 #define	counter_u64_add_protected(c, inc)	do {	\
149 	CRITICAL_ASSERT(curthread);			\
150 	*(uint64_t *)zpcpu_get(c) += (inc);		\
151 } while (0)
152 
153 static inline void
154 counter_u64_add(counter_u64_t c, int64_t inc)
155 {
156 
157 	counter_enter();
158 	counter_u64_add_protected(c, inc);
159 	counter_exit();
160 }
161 
162 #endif	/* 64bit */
163 
164 #endif	/* ! __MACHINE_COUNTER_H__ */
165