1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012, 2013 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 * $FreeBSD$ 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 extern struct pcpu __pcpu[]; 40 41 #define EARLY_COUNTER &__pcpu[0].pc_early_dummy_counter 42 43 #ifdef __powerpc64__ 44 45 #define counter_enter() do {} while (0) 46 #define counter_exit() do {} while (0) 47 48 #ifdef IN_SUBR_COUNTER_C 49 static inline uint64_t 50 counter_u64_read_one(uint64_t *p, int cpu) 51 { 52 53 return (*(uint64_t *)((char *)p + sizeof(struct pcpu) * cpu)); 54 } 55 56 static inline uint64_t 57 counter_u64_fetch_inline(uint64_t *p) 58 { 59 uint64_t r; 60 int i; 61 62 r = 0; 63 CPU_FOREACH(i) 64 r += counter_u64_read_one((uint64_t *)p, i); 65 66 return (r); 67 } 68 69 static void 70 counter_u64_zero_one_cpu(void *arg) 71 { 72 73 *((uint64_t *)((char *)arg + sizeof(struct pcpu) * 74 PCPU_GET(cpuid))) = 0; 75 } 76 77 static inline void 78 counter_u64_zero_inline(counter_u64_t c) 79 { 80 81 smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu, 82 smp_no_rendezvous_barrier, c); 83 } 84 #endif 85 86 #define counter_u64_add_protected(c, i) counter_u64_add(c, i) 87 88 static inline void 89 counter_u64_add(counter_u64_t c, int64_t inc) 90 { 91 uint64_t ccpu, old; 92 93 __asm __volatile("\n" 94 "1:\n\t" 95 "mfsprg %0, 0\n\t" 96 "ldarx %1, %0, %2\n\t" 97 "add %1, %1, %3\n\t" 98 "stdcx. %1, %0, %2\n\t" 99 "bne- 1b" 100 : "=&b" (ccpu), "=&r" (old) 101 : "r" ((char *)c - (char *)&__pcpu[0]), "r" (inc) 102 : "cr0", "memory"); 103 } 104 105 #else /* !64bit */ 106 107 #define counter_enter() critical_enter() 108 #define counter_exit() critical_exit() 109 110 #ifdef IN_SUBR_COUNTER_C 111 /* XXXKIB non-atomic 64bit read */ 112 static inline uint64_t 113 counter_u64_read_one(uint64_t *p, int cpu) 114 { 115 116 return (*(uint64_t *)((char *)p + sizeof(struct pcpu) * cpu)); 117 } 118 119 static inline uint64_t 120 counter_u64_fetch_inline(uint64_t *p) 121 { 122 uint64_t r; 123 int i; 124 125 r = 0; 126 for (i = 0; i < mp_ncpus; i++) 127 r += counter_u64_read_one((uint64_t *)p, i); 128 129 return (r); 130 } 131 132 /* XXXKIB non-atomic 64bit store, might interrupt increment */ 133 static void 134 counter_u64_zero_one_cpu(void *arg) 135 { 136 137 *((uint64_t *)((char *)arg + sizeof(struct pcpu) * 138 PCPU_GET(cpuid))) = 0; 139 } 140 141 static inline void 142 counter_u64_zero_inline(counter_u64_t c) 143 { 144 145 smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu, 146 smp_no_rendezvous_barrier, c); 147 } 148 #endif 149 150 #define counter_u64_add_protected(c, inc) do { \ 151 CRITICAL_ASSERT(curthread); \ 152 *(uint64_t *)zpcpu_get(c) += (inc); \ 153 } while (0) 154 155 static inline void 156 counter_u64_add(counter_u64_t c, int64_t inc) 157 { 158 159 counter_enter(); 160 counter_u64_add_protected(c, inc); 161 counter_exit(); 162 } 163 164 #endif /* 64bit */ 165 166 #endif /* ! __MACHINE_COUNTER_H__ */ 167