607 lines
19 KiB
C
607 lines
19 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Runtime locking correctness validator
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*
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* Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
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* Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra
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*
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* see Documentation/locking/lockdep-design.rst for more details.
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*/
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#ifndef __LINUX_LOCKDEP_H
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#define __LINUX_LOCKDEP_H
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#include <linux/lockdep_types.h>
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#include <linux/smp.h>
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#include <asm/percpu.h>
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struct task_struct;
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/* for sysctl */
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extern int prove_locking;
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extern int lock_stat;
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#ifdef CONFIG_LOCKDEP
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#include <linux/linkage.h>
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#include <linux/list.h>
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#include <linux/debug_locks.h>
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#include <linux/stacktrace.h>
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static inline void lockdep_copy_map(struct lockdep_map *to,
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struct lockdep_map *from)
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{
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int i;
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*to = *from;
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/*
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* Since the class cache can be modified concurrently we could observe
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* half pointers (64bit arch using 32bit copy insns). Therefore clear
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* the caches and take the performance hit.
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*
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* XXX it doesn't work well with lockdep_set_class_and_subclass(), since
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* that relies on cache abuse.
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*/
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for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++)
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to->class_cache[i] = NULL;
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}
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/*
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* Every lock has a list of other locks that were taken after it.
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* We only grow the list, never remove from it:
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*/
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struct lock_list {
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struct list_head entry;
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struct lock_class *class;
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struct lock_class *links_to;
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const struct lock_trace *trace;
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int distance;
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/*
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* The parent field is used to implement breadth-first search, and the
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* bit 0 is reused to indicate if the lock has been accessed in BFS.
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*/
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struct lock_list *parent;
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};
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/**
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* struct lock_chain - lock dependency chain record
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*
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* @irq_context: the same as irq_context in held_lock below
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* @depth: the number of held locks in this chain
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* @base: the index in chain_hlocks for this chain
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* @entry: the collided lock chains in lock_chain hash list
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* @chain_key: the hash key of this lock_chain
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*/
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struct lock_chain {
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/* see BUILD_BUG_ON()s in add_chain_cache() */
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unsigned int irq_context : 2,
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depth : 6,
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base : 24;
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/* 4 byte hole */
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struct hlist_node entry;
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u64 chain_key;
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};
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#define MAX_LOCKDEP_KEYS_BITS 13
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#define MAX_LOCKDEP_KEYS (1UL << MAX_LOCKDEP_KEYS_BITS)
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#define INITIAL_CHAIN_KEY -1
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struct held_lock {
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/*
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* One-way hash of the dependency chain up to this point. We
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* hash the hashes step by step as the dependency chain grows.
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*
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* We use it for dependency-caching and we skip detection
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* passes and dependency-updates if there is a cache-hit, so
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* it is absolutely critical for 100% coverage of the validator
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* to have a unique key value for every unique dependency path
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* that can occur in the system, to make a unique hash value
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* as likely as possible - hence the 64-bit width.
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*
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* The task struct holds the current hash value (initialized
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* with zero), here we store the previous hash value:
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*/
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u64 prev_chain_key;
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unsigned long acquire_ip;
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struct lockdep_map *instance;
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struct lockdep_map *nest_lock;
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#ifdef CONFIG_LOCK_STAT
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u64 waittime_stamp;
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u64 holdtime_stamp;
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#endif
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/*
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* class_idx is zero-indexed; it points to the element in
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* lock_classes this held lock instance belongs to. class_idx is in
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* the range from 0 to (MAX_LOCKDEP_KEYS-1) inclusive.
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*/
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unsigned int class_idx:MAX_LOCKDEP_KEYS_BITS;
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/*
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* The lock-stack is unified in that the lock chains of interrupt
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* contexts nest ontop of process context chains, but we 'separate'
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* the hashes by starting with 0 if we cross into an interrupt
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* context, and we also keep do not add cross-context lock
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* dependencies - the lock usage graph walking covers that area
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* anyway, and we'd just unnecessarily increase the number of
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* dependencies otherwise. [Note: hardirq and softirq contexts
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* are separated from each other too.]
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*
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* The following field is used to detect when we cross into an
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* interrupt context:
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*/
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unsigned int irq_context:2; /* bit 0 - soft, bit 1 - hard */
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unsigned int trylock:1; /* 16 bits */
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unsigned int read:2; /* see lock_acquire() comment */
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unsigned int check:1; /* see lock_acquire() comment */
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unsigned int hardirqs_off:1;
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unsigned int references:12; /* 32 bits */
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unsigned int pin_count;
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};
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/*
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* Initialization, self-test and debugging-output methods:
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*/
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extern void lockdep_init(void);
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extern void lockdep_reset(void);
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extern void lockdep_reset_lock(struct lockdep_map *lock);
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extern void lockdep_free_key_range(void *start, unsigned long size);
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extern asmlinkage void lockdep_sys_exit(void);
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extern void lockdep_set_selftest_task(struct task_struct *task);
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extern void lockdep_init_task(struct task_struct *task);
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/*
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* Split the recrursion counter in two to readily detect 'off' vs recursion.
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*/
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#define LOCKDEP_RECURSION_BITS 16
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#define LOCKDEP_OFF (1U << LOCKDEP_RECURSION_BITS)
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#define LOCKDEP_RECURSION_MASK (LOCKDEP_OFF - 1)
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/*
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* lockdep_{off,on}() are macros to avoid tracing and kprobes; not inlines due
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* to header dependencies.
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*/
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#define lockdep_off() \
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do { \
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current->lockdep_recursion += LOCKDEP_OFF; \
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} while (0)
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#define lockdep_on() \
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do { \
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current->lockdep_recursion -= LOCKDEP_OFF; \
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} while (0)
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extern void lockdep_register_key(struct lock_class_key *key);
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extern void lockdep_unregister_key(struct lock_class_key *key);
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/*
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* These methods are used by specific locking variants (spinlocks,
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* rwlocks, mutexes and rwsems) to pass init/acquire/release events
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* to lockdep:
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*/
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extern void lockdep_init_map_waits(struct lockdep_map *lock, const char *name,
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struct lock_class_key *key, int subclass, short inner, short outer);
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static inline void
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lockdep_init_map_wait(struct lockdep_map *lock, const char *name,
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struct lock_class_key *key, int subclass, short inner)
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{
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lockdep_init_map_waits(lock, name, key, subclass, inner, LD_WAIT_INV);
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}
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static inline void lockdep_init_map(struct lockdep_map *lock, const char *name,
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struct lock_class_key *key, int subclass)
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{
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lockdep_init_map_wait(lock, name, key, subclass, LD_WAIT_INV);
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}
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/*
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* Reinitialize a lock key - for cases where there is special locking or
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* special initialization of locks so that the validator gets the scope
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* of dependencies wrong: they are either too broad (they need a class-split)
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* or they are too narrow (they suffer from a false class-split):
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*/
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#define lockdep_set_class(lock, key) \
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lockdep_init_map_waits(&(lock)->dep_map, #key, key, 0, \
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(lock)->dep_map.wait_type_inner, \
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(lock)->dep_map.wait_type_outer)
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#define lockdep_set_class_and_name(lock, key, name) \
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lockdep_init_map_waits(&(lock)->dep_map, name, key, 0, \
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(lock)->dep_map.wait_type_inner, \
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(lock)->dep_map.wait_type_outer)
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#define lockdep_set_class_and_subclass(lock, key, sub) \
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lockdep_init_map_waits(&(lock)->dep_map, #key, key, sub,\
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(lock)->dep_map.wait_type_inner, \
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(lock)->dep_map.wait_type_outer)
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#define lockdep_set_subclass(lock, sub) \
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lockdep_init_map_waits(&(lock)->dep_map, #lock, (lock)->dep_map.key, sub,\
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(lock)->dep_map.wait_type_inner, \
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(lock)->dep_map.wait_type_outer)
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#define lockdep_set_novalidate_class(lock) \
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lockdep_set_class_and_name(lock, &__lockdep_no_validate__, #lock)
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/*
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* Compare locking classes
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*/
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#define lockdep_match_class(lock, key) lockdep_match_key(&(lock)->dep_map, key)
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static inline int lockdep_match_key(struct lockdep_map *lock,
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struct lock_class_key *key)
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{
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return lock->key == key;
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}
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/*
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* Acquire a lock.
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*
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* Values for "read":
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*
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* 0: exclusive (write) acquire
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* 1: read-acquire (no recursion allowed)
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* 2: read-acquire with same-instance recursion allowed
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*
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* Values for check:
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*
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* 0: simple checks (freeing, held-at-exit-time, etc.)
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* 1: full validation
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*/
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extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
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int trylock, int read, int check,
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struct lockdep_map *nest_lock, unsigned long ip);
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extern void lock_release(struct lockdep_map *lock, unsigned long ip);
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/*
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* Same "read" as for lock_acquire(), except -1 means any.
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*/
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extern int lock_is_held_type(const struct lockdep_map *lock, int read);
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static inline int lock_is_held(const struct lockdep_map *lock)
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{
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return lock_is_held_type(lock, -1);
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}
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#define lockdep_is_held(lock) lock_is_held(&(lock)->dep_map)
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#define lockdep_is_held_type(lock, r) lock_is_held_type(&(lock)->dep_map, (r))
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extern void lock_set_class(struct lockdep_map *lock, const char *name,
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struct lock_class_key *key, unsigned int subclass,
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unsigned long ip);
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static inline void lock_set_subclass(struct lockdep_map *lock,
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unsigned int subclass, unsigned long ip)
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{
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lock_set_class(lock, lock->name, lock->key, subclass, ip);
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}
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extern void lock_downgrade(struct lockdep_map *lock, unsigned long ip);
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#define NIL_COOKIE (struct pin_cookie){ .val = 0U, }
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extern struct pin_cookie lock_pin_lock(struct lockdep_map *lock);
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extern void lock_repin_lock(struct lockdep_map *lock, struct pin_cookie);
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extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie);
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#define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0)
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#define lockdep_assert_held(l) do { \
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WARN_ON(debug_locks && !lockdep_is_held(l)); \
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} while (0)
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#define lockdep_assert_held_write(l) do { \
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WARN_ON(debug_locks && !lockdep_is_held_type(l, 0)); \
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} while (0)
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#define lockdep_assert_held_read(l) do { \
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WARN_ON(debug_locks && !lockdep_is_held_type(l, 1)); \
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} while (0)
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#define lockdep_assert_held_once(l) do { \
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WARN_ON_ONCE(debug_locks && !lockdep_is_held(l)); \
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} while (0)
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#define lockdep_recursing(tsk) ((tsk)->lockdep_recursion)
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#define lockdep_pin_lock(l) lock_pin_lock(&(l)->dep_map)
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#define lockdep_repin_lock(l,c) lock_repin_lock(&(l)->dep_map, (c))
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#define lockdep_unpin_lock(l,c) lock_unpin_lock(&(l)->dep_map, (c))
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#else /* !CONFIG_LOCKDEP */
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static inline void lockdep_init_task(struct task_struct *task)
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{
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}
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static inline void lockdep_off(void)
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{
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}
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static inline void lockdep_on(void)
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{
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}
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static inline void lockdep_set_selftest_task(struct task_struct *task)
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{
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}
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# define lock_acquire(l, s, t, r, c, n, i) do { } while (0)
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# define lock_release(l, i) do { } while (0)
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# define lock_downgrade(l, i) do { } while (0)
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# define lock_set_class(l, n, k, s, i) do { } while (0)
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# define lock_set_subclass(l, s, i) do { } while (0)
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# define lockdep_init() do { } while (0)
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# define lockdep_init_map_waits(lock, name, key, sub, inner, outer) \
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do { (void)(name); (void)(key); } while (0)
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# define lockdep_init_map_wait(lock, name, key, sub, inner) \
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do { (void)(name); (void)(key); } while (0)
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# define lockdep_init_map(lock, name, key, sub) \
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do { (void)(name); (void)(key); } while (0)
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# define lockdep_set_class(lock, key) do { (void)(key); } while (0)
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# define lockdep_set_class_and_name(lock, key, name) \
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do { (void)(key); (void)(name); } while (0)
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#define lockdep_set_class_and_subclass(lock, key, sub) \
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do { (void)(key); } while (0)
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#define lockdep_set_subclass(lock, sub) do { } while (0)
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#define lockdep_set_novalidate_class(lock) do { } while (0)
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/*
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* We don't define lockdep_match_class() and lockdep_match_key() for !LOCKDEP
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* case since the result is not well defined and the caller should rather
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* #ifdef the call himself.
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*/
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# define lockdep_reset() do { debug_locks = 1; } while (0)
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# define lockdep_free_key_range(start, size) do { } while (0)
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# define lockdep_sys_exit() do { } while (0)
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static inline void lockdep_register_key(struct lock_class_key *key)
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{
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}
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static inline void lockdep_unregister_key(struct lock_class_key *key)
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{
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}
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#define lockdep_depth(tsk) (0)
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#define lockdep_is_held_type(l, r) (1)
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#define lockdep_assert_held(l) do { (void)(l); } while (0)
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#define lockdep_assert_held_write(l) do { (void)(l); } while (0)
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#define lockdep_assert_held_read(l) do { (void)(l); } while (0)
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#define lockdep_assert_held_once(l) do { (void)(l); } while (0)
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#define lockdep_recursing(tsk) (0)
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#define NIL_COOKIE (struct pin_cookie){ }
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#define lockdep_pin_lock(l) ({ struct pin_cookie cookie = { }; cookie; })
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#define lockdep_repin_lock(l, c) do { (void)(l); (void)(c); } while (0)
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#define lockdep_unpin_lock(l, c) do { (void)(l); (void)(c); } while (0)
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#endif /* !LOCKDEP */
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enum xhlock_context_t {
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XHLOCK_HARD,
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XHLOCK_SOFT,
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XHLOCK_CTX_NR,
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};
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#define lockdep_init_map_crosslock(m, n, k, s) do {} while (0)
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/*
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* To initialize a lockdep_map statically use this macro.
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* Note that _name must not be NULL.
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*/
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#define STATIC_LOCKDEP_MAP_INIT(_name, _key) \
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{ .name = (_name), .key = (void *)(_key), }
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static inline void lockdep_invariant_state(bool force) {}
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static inline void lockdep_free_task(struct task_struct *task) {}
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#ifdef CONFIG_LOCK_STAT
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extern void lock_contended(struct lockdep_map *lock, unsigned long ip);
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extern void lock_acquired(struct lockdep_map *lock, unsigned long ip);
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#define LOCK_CONTENDED(_lock, try, lock) \
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do { \
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if (!try(_lock)) { \
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lock_contended(&(_lock)->dep_map, _RET_IP_); \
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lock(_lock); \
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} \
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lock_acquired(&(_lock)->dep_map, _RET_IP_); \
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} while (0)
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#define LOCK_CONTENDED_RETURN(_lock, try, lock) \
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({ \
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int ____err = 0; \
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if (!try(_lock)) { \
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lock_contended(&(_lock)->dep_map, _RET_IP_); \
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____err = lock(_lock); \
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} \
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if (!____err) \
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lock_acquired(&(_lock)->dep_map, _RET_IP_); \
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____err; \
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})
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#else /* CONFIG_LOCK_STAT */
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#define lock_contended(lockdep_map, ip) do {} while (0)
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#define lock_acquired(lockdep_map, ip) do {} while (0)
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#define LOCK_CONTENDED(_lock, try, lock) \
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lock(_lock)
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#define LOCK_CONTENDED_RETURN(_lock, try, lock) \
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lock(_lock)
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#endif /* CONFIG_LOCK_STAT */
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#ifdef CONFIG_LOCKDEP
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/*
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* On lockdep we dont want the hand-coded irq-enable of
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* _raw_*_lock_flags() code, because lockdep assumes
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* that interrupts are not re-enabled during lock-acquire:
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*/
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#define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \
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LOCK_CONTENDED((_lock), (try), (lock))
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#else /* CONFIG_LOCKDEP */
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#define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \
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lockfl((_lock), (flags))
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#endif /* CONFIG_LOCKDEP */
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#ifdef CONFIG_PROVE_LOCKING
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extern void print_irqtrace_events(struct task_struct *curr);
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#else
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static inline void print_irqtrace_events(struct task_struct *curr)
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{
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}
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#endif
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/*
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* For trivial one-depth nesting of a lock-class, the following
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* global define can be used. (Subsystems with multiple levels
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* of nesting should define their own lock-nesting subclasses.)
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*/
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#define SINGLE_DEPTH_NESTING 1
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/*
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* Map the dependency ops to NOP or to real lockdep ops, depending
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* on the per lock-class debug mode:
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*/
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#define lock_acquire_exclusive(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, n, i)
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#define lock_acquire_shared(l, s, t, n, i) lock_acquire(l, s, t, 1, 1, n, i)
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#define lock_acquire_shared_recursive(l, s, t, n, i) lock_acquire(l, s, t, 2, 1, n, i)
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#define spin_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
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#define spin_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
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#define spin_release(l, i) lock_release(l, i)
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#define rwlock_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
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#define rwlock_acquire_read(l, s, t, i) lock_acquire_shared_recursive(l, s, t, NULL, i)
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#define rwlock_release(l, i) lock_release(l, i)
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#define seqcount_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
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#define seqcount_acquire_read(l, s, t, i) lock_acquire_shared_recursive(l, s, t, NULL, i)
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#define seqcount_release(l, i) lock_release(l, i)
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#define mutex_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
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#define mutex_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
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#define mutex_release(l, i) lock_release(l, i)
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#define rwsem_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
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#define rwsem_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
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#define rwsem_acquire_read(l, s, t, i) lock_acquire_shared(l, s, t, NULL, i)
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#define rwsem_release(l, i) lock_release(l, i)
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#define lock_map_acquire(l) lock_acquire_exclusive(l, 0, 0, NULL, _THIS_IP_)
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#define lock_map_acquire_read(l) lock_acquire_shared_recursive(l, 0, 0, NULL, _THIS_IP_)
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#define lock_map_acquire_tryread(l) lock_acquire_shared_recursive(l, 0, 1, NULL, _THIS_IP_)
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#define lock_map_release(l) lock_release(l, _THIS_IP_)
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#ifdef CONFIG_PROVE_LOCKING
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# define might_lock(lock) \
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do { \
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typecheck(struct lockdep_map *, &(lock)->dep_map); \
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lock_acquire(&(lock)->dep_map, 0, 0, 0, 1, NULL, _THIS_IP_); \
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lock_release(&(lock)->dep_map, _THIS_IP_); \
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} while (0)
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# define might_lock_read(lock) \
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do { \
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typecheck(struct lockdep_map *, &(lock)->dep_map); \
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lock_acquire(&(lock)->dep_map, 0, 0, 1, 1, NULL, _THIS_IP_); \
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lock_release(&(lock)->dep_map, _THIS_IP_); \
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} while (0)
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# define might_lock_nested(lock, subclass) \
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do { \
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typecheck(struct lockdep_map *, &(lock)->dep_map); \
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lock_acquire(&(lock)->dep_map, subclass, 0, 1, 1, NULL, \
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_THIS_IP_); \
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lock_release(&(lock)->dep_map, _THIS_IP_); \
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} while (0)
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DECLARE_PER_CPU(int, hardirqs_enabled);
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DECLARE_PER_CPU(int, hardirq_context);
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#define lockdep_assert_irqs_enabled() \
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do { \
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WARN_ON_ONCE(debug_locks && !this_cpu_read(hardirqs_enabled)); \
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} while (0)
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#define lockdep_assert_irqs_disabled() \
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do { \
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WARN_ON_ONCE(debug_locks && this_cpu_read(hardirqs_enabled)); \
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} while (0)
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#define lockdep_assert_in_irq() \
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do { \
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WARN_ON_ONCE(debug_locks && !this_cpu_read(hardirq_context)); \
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} while (0)
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#define lockdep_assert_preemption_enabled() \
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do { \
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WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_COUNT) && \
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debug_locks && \
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(preempt_count() != 0 || \
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!this_cpu_read(hardirqs_enabled))); \
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} while (0)
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#define lockdep_assert_preemption_disabled() \
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do { \
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WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_COUNT) && \
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debug_locks && \
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(preempt_count() == 0 && \
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this_cpu_read(hardirqs_enabled))); \
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} while (0)
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#else
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# define might_lock(lock) do { } while (0)
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# define might_lock_read(lock) do { } while (0)
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# define might_lock_nested(lock, subclass) do { } while (0)
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# define lockdep_assert_irqs_enabled() do { } while (0)
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# define lockdep_assert_irqs_disabled() do { } while (0)
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# define lockdep_assert_in_irq() do { } while (0)
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# define lockdep_assert_preemption_enabled() do { } while (0)
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# define lockdep_assert_preemption_disabled() do { } while (0)
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#endif
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#ifdef CONFIG_PROVE_RAW_LOCK_NESTING
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# define lockdep_assert_RT_in_threaded_ctx() do { \
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WARN_ONCE(debug_locks && !current->lockdep_recursion && \
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lockdep_hardirq_context() && \
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!(current->hardirq_threaded || current->irq_config), \
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"Not in threaded context on PREEMPT_RT as expected\n"); \
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} while (0)
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#else
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# define lockdep_assert_RT_in_threaded_ctx() do { } while (0)
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#endif
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#ifdef CONFIG_LOCKDEP
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void lockdep_rcu_suspicious(const char *file, const int line, const char *s);
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#else
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static inline void
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lockdep_rcu_suspicious(const char *file, const int line, const char *s)
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{
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}
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#endif
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#endif /* __LINUX_LOCKDEP_H */
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