1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 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 36 extern struct pcpu __pcpu[]; 37 38 #define EARLY_COUNTER &__pcpu[0].pc_early_dummy_counter 39 40 #define counter_enter() do {} while (0) 41 #define counter_exit() do {} while (0) 42 43 #ifdef IN_SUBR_COUNTER_C 44 static inline uint64_t 45 counter_u64_read_one(uint64_t *p, int cpu) 46 { 47 48 return (*(uint64_t *)((char *)p + sizeof(struct pcpu) * 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 CPU_FOREACH(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 *((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_rendezvous_barrier, counter_u64_zero_one_cpu, 77 smp_no_rendezvous_barrier, c); 78 } 79 #endif 80 81 #define counter_u64_add_protected(c, i) counter_u64_add(c, i) 82 83 static inline void 84 counter_u64_add(counter_u64_t c, int64_t inc) 85 { 86 87 __asm __volatile("addq\t%1,%%gs:(%0)" 88 : 89 : "r" ((char *)c - (char *)&__pcpu[0]), "ri" (inc) 90 : "memory", "cc"); 91 } 92 93 #endif /* ! __MACHINE_COUNTER_H__ */ 94