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/* $OpenBSD: witness.h,v 1.5 2019/04/23 13:35:12 visa Exp $ */
/*-
* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
*
* 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, 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.
* 3. Berkeley Software Design Inc's name may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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.
*
* from BSDI Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp
* $FreeBSD: head/sys/sys/lock.h 313908 2017-02-18 01:52:10Z mjg $
*/
#ifndef _SYS_WITNESS_H_
#define _SYS_WITNESS_H_
#include <sys/_lock.h>
/*
* Lock classes are statically assigned an index into the global lock_classes
* array. Debugging code looks up the lock class for a given lock object
* by indexing the array.
*/
#define LO_CLASSINDEX(lock) \
((((lock)->lo_flags) & LO_CLASSMASK) >> LO_CLASSSHIFT)
#define LOCK_CLASS(lock) \
(lock_classes[LO_CLASSINDEX((lock))])
#define LOCK_CLASS_MAX \
(LO_CLASSMASK >> LO_CLASSSHIFT)
/*
* Option flags passed to lock operations that witness also needs to know
* about or that are generic across all locks.
*/
#define LOP_NEWORDER 0x00000001 /* Define a new lock order. */
#define LOP_QUIET 0x00000002 /* Don't log locking operations. */
#define LOP_TRYLOCK 0x00000004 /* Don't check lock order. */
#define LOP_EXCLUSIVE 0x00000008 /* Exclusive lock. */
#define LOP_DUPOK 0x00000010 /* Don't check for duplicate acquires */
/* Flags passed to witness_assert. */
#define LA_MASKASSERT 0x000000ff /* Mask for witness defined asserts. */
#define LA_UNLOCKED 0x00000000 /* Lock is unlocked. */
#define LA_LOCKED 0x00000001 /* Lock is at least share locked. */
#define LA_SLOCKED 0x00000002 /* Lock is exactly share locked. */
#define LA_XLOCKED 0x00000004 /* Lock is exclusively locked. */
#define LA_RECURSED 0x00000008 /* Lock is recursed. */
#define LA_NOTRECURSED 0x00000010 /* Lock is not recursed. */
#ifdef _KERNEL
void witness_initialize(void);
void witness_init(struct lock_object *, const struct lock_type *);
int witness_defineorder(struct lock_object *, struct lock_object *);
void witness_checkorder(struct lock_object *, int, struct lock_object *);
void witness_lock(struct lock_object *, int);
void witness_upgrade(struct lock_object *, int);
void witness_downgrade(struct lock_object *, int);
void witness_unlock(struct lock_object *, int);
int witness_warn(int, struct lock_object *, const char *, ...);
void witness_assert(const struct lock_object *, int);
void witness_display_spinlock(struct lock_object *, struct proc *,
int (*)(const char *, ...));
int witness_line(struct lock_object *);
void witness_norelease(struct lock_object *);
void witness_releaseok(struct lock_object *);
const char *witness_file(struct lock_object *);
void witness_thread_exit(struct proc *);
int witness_sysctl(int *, u_int, void *, size_t *, void *, size_t);
int witness_sysctl_watch(void *, size_t *, void *, size_t);
#ifdef WITNESS
/* Flags for witness_warn(). */
#define WARN_KERNELOK 0x01 /* Kernel lock is exempt from this check. */
#define WARN_PANIC 0x02 /* Panic if check fails. */
#define WARN_SLEEPOK 0x04 /* Sleepable locks are exempt from check. */
#define WITNESS_INITIALIZE() \
witness_initialize()
#define WITNESS_INIT(lock, type) \
witness_init((lock), (type))
#define WITNESS_CHECKORDER(lock, flags, interlock) \
witness_checkorder((lock), (flags), (interlock))
#define WITNESS_DEFINEORDER(lock1, lock2) \
witness_defineorder((struct lock_object *)(lock1), \
(struct lock_object *)(lock2))
#define WITNESS_LOCK(lock, flags) \
witness_lock((lock), (flags))
#define WITNESS_UPGRADE(lock, flags) \
witness_upgrade((lock), (flags))
#define WITNESS_DOWNGRADE(lock, flags) \
witness_downgrade((lock), (flags))
#define WITNESS_UNLOCK(lock, flags) \
witness_unlock((lock), (flags))
#define WITNESS_CHECK(flags, lock, fmt, ...) \
witness_warn((flags), (lock), (fmt), ## __VA_ARGS__)
#define WITNESS_WARN(flags, lock, fmt, ...) \
witness_warn((flags), (lock), (fmt), ## __VA_ARGS__)
#define WITNESS_NORELEASE(lock) \
witness_norelease(&(lock)->lock_object)
#define WITNESS_RELEASEOK(lock) \
witness_releaseok(&(lock)->lock_object)
#define WITNESS_THREAD_EXIT(p) \
witness_thread_exit((p))
#else /* WITNESS */
#define WITNESS_INITIALIZE() (void)0
#define WITNESS_INIT(lock, type) (void)0
#define WITNESS_DEFINEORDER(lock1, lock2) 0
#define WITNESS_CHECKORDER(lock, flagsi, interlock) (void)0
#define WITNESS_LOCK(lock, flags) (void)0
#define WITNESS_UPGRADE(lock, flags) (void)0
#define WITNESS_DOWNGRADE(lock, flags) (void)0
#define WITNESS_UNLOCK(lock, flags) (void)0
#define WITNESS_CHECK(flags, lock, fmt, ...) 0
#define WITNESS_WARN(flags, lock, fmt, ...) (void)0
#define WITNESS_NORELEASE(lock) (void)0
#define WITNESS_RELEASEOK(lock) (void)0
#define WITNESS_THREAD_EXIT(p) (void)0
#endif /* WITNESS */
#endif /* _KERNEL */
#endif /* _SYS_WITNESS_H_ */
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