rcupdate.h revision 328653
1293194Shselasky/*- 2328653Shselasky * Copyright (c) 2016-2017 Mellanox Technologies, Ltd. 3293194Shselasky * All rights reserved. 4293194Shselasky * 5293194Shselasky * Redistribution and use in source and binary forms, with or without 6293194Shselasky * modification, are permitted provided that the following conditions 7293194Shselasky * are met: 8293194Shselasky * 1. Redistributions of source code must retain the above copyright 9293194Shselasky * notice unmodified, this list of conditions, and the following 10293194Shselasky * disclaimer. 11293194Shselasky * 2. Redistributions in binary form must reproduce the above copyright 12293194Shselasky * notice, this list of conditions and the following disclaimer in the 13293194Shselasky * documentation and/or other materials provided with the distribution. 14293194Shselasky * 15293194Shselasky * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16293194Shselasky * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17293194Shselasky * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18293194Shselasky * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19293194Shselasky * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20293194Shselasky * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21293194Shselasky * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22293194Shselasky * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23293194Shselasky * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24293194Shselasky * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25293194Shselasky * 26293194Shselasky * $FreeBSD: stable/11/sys/compat/linuxkpi/common/include/linux/rcupdate.h 328653 2018-02-01 13:01:44Z hselasky $ 27293194Shselasky */ 28293194Shselasky#ifndef _LINUX_RCUPDATE_H_ 29293194Shselasky#define _LINUX_RCUPDATE_H_ 30293194Shselasky 31328653Shselasky#include <linux/compiler.h> 32328653Shselasky#include <linux/types.h> 33293194Shselasky 34328653Shselasky#include <machine/atomic.h> 35293194Shselasky 36328653Shselasky#define LINUX_KFREE_RCU_OFFSET_MAX 4096 /* exclusive */ 37293194Shselasky 38328653Shselasky#define RCU_INITIALIZER(v) \ 39328653Shselasky ((__typeof(*(v)) *)(v)) 40293194Shselasky 41328653Shselasky#define RCU_INIT_POINTER(p, v) do { \ 42328653Shselasky (p) = (v); \ 43328653Shselasky} while (0) 44293194Shselasky 45328653Shselasky#define call_rcu(ptr, func) do { \ 46328653Shselasky linux_call_rcu(ptr, func); \ 47328653Shselasky} while (0) 48293194Shselasky 49328653Shselasky#define rcu_barrier(void) do { \ 50328653Shselasky linux_rcu_barrier(); \ 51328653Shselasky} while (0) 52293194Shselasky 53328653Shselasky#define rcu_read_lock(void) do { \ 54328653Shselasky linux_rcu_read_lock(); \ 55328653Shselasky} while (0) 56293194Shselasky 57328653Shselasky#define rcu_read_unlock(void) do { \ 58328653Shselasky linux_rcu_read_unlock(); \ 59328653Shselasky} while (0) 60293194Shselasky 61328653Shselasky#define synchronize_rcu(void) do { \ 62328653Shselasky linux_synchronize_rcu(); \ 63294837Shselasky} while (0) 64294837Shselasky 65328653Shselasky#define synchronize_rcu_expedited(void) do { \ 66328653Shselasky linux_synchronize_rcu(); \ 67294837Shselasky} while (0) 68294837Shselasky 69328653Shselasky#define kfree_rcu(ptr, rcu_head) do { \ 70328653Shselasky CTASSERT(offsetof(__typeof(*(ptr)), rcu_head) < \ 71328653Shselasky LINUX_KFREE_RCU_OFFSET_MAX); \ 72328653Shselasky call_rcu(&(ptr)->rcu_head, (rcu_callback_t)(uintptr_t) \ 73328653Shselasky offsetof(__typeof(*(ptr)), rcu_head)); \ 74294837Shselasky} while (0) 75294837Shselasky 76328653Shselasky#define rcu_access_pointer(p) \ 77328653Shselasky ((__typeof(*p) *)(READ_ONCE(p))) 78328653Shselasky 79328653Shselasky#define rcu_dereference_protected(p, c) \ 80328653Shselasky ((__typeof(*p) *)(p)) 81328653Shselasky 82328653Shselasky#define rcu_dereference(p) \ 83328653Shselasky rcu_dereference_protected(p, 0) 84328653Shselasky 85328653Shselasky#define rcu_pointer_handoff(p) (p) 86328653Shselasky 87328653Shselasky#define rcu_assign_pointer(p, v) do { \ 88328653Shselasky atomic_store_rel_ptr((volatile uintptr_t *)&(p), \ 89328653Shselasky (uintptr_t)(v)); \ 90328653Shselasky} while (0) 91328653Shselasky 92328653Shselasky/* prototypes */ 93328653Shselasky 94328653Shselaskyextern void linux_call_rcu(struct rcu_head *ptr, rcu_callback_t func); 95328653Shselaskyextern void linux_rcu_barrier(void); 96328653Shselaskyextern void linux_rcu_read_lock(void); 97328653Shselaskyextern void linux_rcu_read_unlock(void); 98328653Shselaskyextern void linux_synchronize_rcu(void); 99328653Shselasky 100293194Shselasky#endif /* _LINUX_RCUPDATE_H_ */ 101