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 #define EARLY_COUNTER &temp_bsp_pcpu.pc_early_dummy_counter 37 38 #define counter_enter() do {} while (0) 39 #define counter_exit() do {} while (0) 40 41 #ifdef IN_SUBR_COUNTER_C 42 static inline uint64_t 43 counter_u64_read_one(counter_u64_t c, int cpu) 44 { 45 46 return (*zpcpu_get_cpu(c, cpu)); 47 } 48 49 static inline uint64_t 50 counter_u64_fetch_inline(uint64_t *c) 51 { 52 uint64_t r; 53 int cpu; 54 55 r = 0; 56 CPU_FOREACH(cpu) 57 r += counter_u64_read_one(c, cpu); 58 59 return (r); 60 } 61 62 static void 63 counter_u64_zero_one_cpu(void *arg) 64 { 65 counter_u64_t c; 66 67 c = arg; 68 *(zpcpu_get(c)) = 0; 69 } 70 71 static inline void 72 counter_u64_zero_inline(counter_u64_t c) 73 { 74 75 smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu, 76 smp_no_rendezvous_barrier, c); 77 } 78 #endif 79 80 #define counter_u64_add_protected(c, i) counter_u64_add(c, i) 81 82 static inline void 83 counter_u64_add(counter_u64_t c, int64_t inc) 84 { 85 86 KASSERT(IS_BSP() || c != EARLY_COUNTER, ("EARLY_COUNTER used on AP")); 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