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 34 extern struct pcpu __pcpu[1]; 35 36 #define counter_enter() do {} while (0) 37 #define counter_exit() do {} while (0) 38 39 #ifdef IN_SUBR_COUNTER_C 40 static inline uint64_t 41 counter_u64_read_one(uint64_t *p, int cpu) 42 { 43 44 return (*(uint64_t *)((char *)p + sizeof(struct pcpu) * cpu)); 45 } 46 47 static inline uint64_t 48 counter_u64_fetch_inline(uint64_t *p) 49 { 50 uint64_t r; 51 int i; 52 53 r = 0; 54 for (i = 0; i < mp_ncpus; i++) 55 r += counter_u64_read_one((uint64_t *)p, i); 56 57 return (r); 58 } 59 60 static void 61 counter_u64_zero_one_cpu(void *arg) 62 { 63 64 *((uint64_t *)((char *)arg + sizeof(struct pcpu) * 65 PCPU_GET(cpuid))) = 0; 66 } 67 68 static inline void 69 counter_u64_zero_inline(counter_u64_t c) 70 { 71 72 smp_rendezvous(smp_no_rendevous_barrier, counter_u64_zero_one_cpu, 73 smp_no_rendevous_barrier, c); 74 } 75 #endif 76 77 #define counter_u64_add_protected(c, i) counter_u64_add(c, i) 78 79 static inline void 80 counter_u64_add(counter_u64_t c, int64_t inc) 81 { 82 83 __asm __volatile("addq\t%1,%%gs:(%0)" 84 : 85 : "r" ((char *)c - (char *)&__pcpu[0]), "ri" (inc) 86 : "memory", "cc"); 87 } 88 89 #endif /* ! __MACHINE_COUNTER_H__ */ 90