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