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