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/*-
* Copyright (c) 2016-2017 Mellanox Technologies, Ltd.
* All rights reserved.
* Copyright (c) 2024-2025 The FreeBSD Foundation
*
* Portions of this software were developed by Björn Zeeb
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUXKPI_LINUX_RCUPDATE_H_
#define _LINUXKPI_LINUX_RCUPDATE_H_
#include <sys/cdefs.h>
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/cleanup.h>
#include <machine/atomic.h>
extern int linuxkpi_rcu_debug;
#define RCU_WARN_ONCE(c, ...) do { \
if (unlikely(linuxkpi_rcu_debug > 0)) \
WARN_ONCE((c), ##__VA_ARGS__); \
} while(0)
#define LINUX_KFREE_RCU_OFFSET_MAX 4096 /* exclusive */
/* BSD specific defines */
#define RCU_TYPE_REGULAR 0
#define RCU_TYPE_SLEEPABLE 1
#define RCU_TYPE_MAX 2
#define RCU_INITIALIZER(v) \
((__typeof(*(v)) *)(v))
#define RCU_INIT_POINTER(p, v) do { \
(p) = (v); \
} while (0)
#define call_rcu(ptr, func) do { \
linux_call_rcu(RCU_TYPE_REGULAR, ptr, func); \
} while (0)
#define rcu_barrier(void) do { \
linux_rcu_barrier(RCU_TYPE_REGULAR); \
} while (0)
#define rcu_read_lock(void) do { \
linux_rcu_read_lock(RCU_TYPE_REGULAR); \
} while (0)
#define rcu_read_unlock(void) do { \
linux_rcu_read_unlock(RCU_TYPE_REGULAR);\
} while (0)
#define rcu_read_lock_held(void) \
linux_rcu_read_lock_held(RCU_TYPE_REGULAR)
#define synchronize_rcu(void) do { \
linux_synchronize_rcu(RCU_TYPE_REGULAR); \
} while (0)
#define synchronize_rcu_expedited(void) do { \
linux_synchronize_rcu(RCU_TYPE_REGULAR); \
} while (0)
#define kfree_rcu(ptr, rcu_head) do { \
CTASSERT(offsetof(__typeof(*(ptr)), rcu_head) < \
LINUX_KFREE_RCU_OFFSET_MAX); \
call_rcu(&(ptr)->rcu_head, (rcu_callback_t)(uintptr_t) \
offsetof(__typeof(*(ptr)), rcu_head)); \
} while (0)
#define rcu_access_pointer(p) \
((__typeof(*p) *)READ_ONCE(p))
#define rcu_dereference(p) \
((__typeof(*p) *)READ_ONCE(p))
#define __rcu_var_name(n, f, l) \
__CONCAT(__CONCAT(__CONCAT(rcu_, n), _), __COUNTER__)
#define __rcu_dereference_protected(p, c, n) \
({ \
RCU_WARN_ONCE(!(c), "%s:%d: condition for %s failed\n", \
__func__, __LINE__, __XSTRING(n)); \
rcu_dereference(p); \
})
#define rcu_dereference_protected(p, c) \
__rcu_dereference_protected((p), (c), \
__rcu_var_name(protected, __func__, __LINE__))
#define __rcu_dereference_check(p, c, n) \
({ \
__typeof(*p) *n = rcu_dereference(p); \
RCU_WARN_ONCE(!(c), "%s:%d: condition for %s failed\n", \
__func__, __LINE__, __XSTRING(n)); \
n; \
})
#define rcu_dereference_check(p, c) \
__rcu_dereference_check((p), (c) || rcu_read_lock_held(), \
__rcu_var_name(check, __func__, __LINE__))
#define rcu_dereference_raw(p) \
((__typeof(*p) *)READ_ONCE(p))
#define rcu_pointer_handoff(p) (p)
#define rcu_assign_pointer(p, v) do { \
atomic_store_rel_ptr((volatile uintptr_t *)&(p), \
(uintptr_t)(v)); \
} while (0)
#define rcu_replace_pointer(rcu, ptr, c) \
({ \
typeof(ptr) __tmp = rcu_dereference_protected(rcu, c); \
rcu_assign_pointer(rcu, ptr); \
__tmp; \
})
#define rcu_swap_protected(rcu, ptr, c) do { \
typeof(ptr) p = rcu_dereference_protected(rcu, c); \
rcu_assign_pointer(rcu, ptr); \
(ptr) = p; \
} while (0)
/* prototypes */
void linux_call_rcu(unsigned type, struct rcu_head *ptr, rcu_callback_t func);
void linux_rcu_barrier(unsigned type);
void linux_rcu_read_lock(unsigned type);
void linux_rcu_read_unlock(unsigned type);
bool linux_rcu_read_lock_held(unsigned);
void linux_synchronize_rcu(unsigned type);
/* Empty implementation for !DEBUG */
#define init_rcu_head(...)
#define destroy_rcu_head(...)
#define init_rcu_head_on_stack(...)
#define destroy_rcu_head_on_stack(...)
DEFINE_LOCK_GUARD_0(rcu, rcu_read_lock(), rcu_read_unlock())
#endif /* _LINUXKPI_LINUX_RCUPDATE_H_ */
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