1 /*- 2 * Copyright (c) 2012 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 #include <machine/atomic.h> 34 #ifdef INVARIANTS 35 #include <sys/proc.h> 36 #endif 37 38 #define counter_enter() critical_enter() 39 #define counter_exit() critical_exit() 40 41 #ifdef IN_SUBR_COUNTER_C 42 43 static inline uint64_t 44 counter_u64_read_one(uint64_t *p, int cpu) 45 { 46 47 return (atomic_load_64((uint64_t *)((char *)p + sizeof(struct pcpu) * 48 cpu))); 49 } 50 51 static inline uint64_t 52 counter_u64_fetch_inline(uint64_t *p) 53 { 54 uint64_t r; 55 int i; 56 57 r = 0; 58 for (i = 0; i < mp_ncpus; i++) 59 r += counter_u64_read_one((uint64_t *)p, i); 60 61 return (r); 62 } 63 64 static void 65 counter_u64_zero_one_cpu(void *arg) 66 { 67 68 atomic_store_64((uint64_t *)((char *)arg + sizeof(struct pcpu) * 69 PCPU_GET(cpuid)), 0); 70 } 71 72 static inline void 73 counter_u64_zero_inline(counter_u64_t c) 74 { 75 76 smp_rendezvous(smp_no_rendevous_barrier, counter_u64_zero_one_cpu, 77 smp_no_rendevous_barrier, c); 78 } 79 #endif 80 81 #define counter_u64_add_protected(c, inc) do { \ 82 CRITICAL_ASSERT(curthread); \ 83 atomic_add_64((uint64_t *)zpcpu_get(c), (inc)); \ 84 } while (0) 85 86 static inline void 87 counter_u64_add(counter_u64_t c, int64_t inc) 88 { 89 90 counter_enter(); 91 counter_u64_add_protected(c, inc); 92 counter_exit(); 93 } 94 95 #endif /* ! __MACHINE_COUNTER_H__ */ 96