lockdep_internals.h | Explore in Territory

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * kernel/lockdep_internals.h
 *
 * Runtime locking correctness validator
 *
 * lockdep subsystem internal functions and variables.
 */

/*
 * Lock-class usage-state bits:
 */
enum lock_usage_bit { … };

/* states after LOCK_USED_READ are not traced and printed */
static_assert(…);

#define LOCK_USAGE_READ_MASK …
#define LOCK_USAGE_DIR_MASK …
#define LOCK_USAGE_STATE_MASK …

/*
 * Usage-state bitmasks:
 */
#define __LOCKF(__STATE) …

enum { … };

#define LOCKDEP_STATE …
static const unsigned long LOCKF_ENABLED_IRQ = …;
#undef LOCKDEP_STATE

#define LOCKDEP_STATE …
static const unsigned long LOCKF_USED_IN_IRQ = …;
#undef LOCKDEP_STATE

#define LOCKDEP_STATE …
static const unsigned long LOCKF_ENABLED_IRQ_READ = …;
#undef LOCKDEP_STATE

#define LOCKDEP_STATE …
static const unsigned long LOCKF_USED_IN_IRQ_READ = …;
#undef LOCKDEP_STATE

#define LOCKF_ENABLED_IRQ_ALL …
#define LOCKF_USED_IN_IRQ_ALL …

#define LOCKF_IRQ …
#define LOCKF_IRQ_READ …

/*
 * CONFIG_LOCKDEP_SMALL is defined for sparc. Sparc requires .text,
 * .data and .bss to fit in required 32MB limit for the kernel. With
 * CONFIG_LOCKDEP we could go over this limit and cause system boot-up problems.
 * So, reduce the static allocations for lockdeps related structures so that
 * everything fits in current required size limit.
 */
#ifdef CONFIG_LOCKDEP_SMALL
/*
 * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies
 * we track.
 *
 * We use the per-lock dependency maps in two ways: we grow it by adding
 * every to-be-taken lock to all currently held lock's own dependency
 * table (if it's not there yet), and we check it for lock order
 * conflicts and deadlocks.
 */
#define MAX_LOCKDEP_ENTRIES …
#define MAX_LOCKDEP_CHAINS_BITS …
#define MAX_STACK_TRACE_ENTRIES …
#define STACK_TRACE_HASH_SIZE …
#else
#define MAX_LOCKDEP_ENTRIES …

#define MAX_LOCKDEP_CHAINS_BITS …

/*
 * Stack-trace: tightly packed array of stack backtrace
 * addresses. Protected by the hash_lock.
 */
#define MAX_STACK_TRACE_ENTRIES …
#define STACK_TRACE_HASH_SIZE …
#endif

/*
 * Bit definitions for lock_chain.irq_context
 */
#define LOCK_CHAIN_SOFTIRQ_CONTEXT …
#define LOCK_CHAIN_HARDIRQ_CONTEXT …

#define MAX_LOCKDEP_CHAINS …

#define MAX_LOCKDEP_CHAIN_HLOCKS …

extern struct lock_chain lock_chains[];

#define LOCK_USAGE_CHARS …

extern void get_usage_chars(struct lock_class *class,
			    char usage[LOCK_USAGE_CHARS]);

extern const char *__get_key_name(const struct lockdep_subclass_key *key,
				  char *str);

struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);

extern unsigned long nr_lock_classes;
extern unsigned long nr_zapped_classes;
extern unsigned long nr_zapped_lock_chains;
extern unsigned long nr_list_entries;
long lockdep_next_lockchain(long i);
unsigned long lock_chain_count(void);
extern unsigned long nr_stack_trace_entries;

extern unsigned int nr_hardirq_chains;
extern unsigned int nr_softirq_chains;
extern unsigned int nr_process_chains;
extern unsigned int nr_free_chain_hlocks;
extern unsigned int nr_lost_chain_hlocks;
extern unsigned int nr_large_chain_blocks;

extern unsigned int max_lockdep_depth;
extern unsigned int max_bfs_queue_depth;
extern unsigned long max_lock_class_idx;

extern struct lock_class lock_classes[MAX_LOCKDEP_KEYS];
extern unsigned long lock_classes_in_use[];

#ifdef CONFIG_PROVE_LOCKING
extern unsigned long lockdep_count_forward_deps(struct lock_class *);
extern unsigned long lockdep_count_backward_deps(struct lock_class *);
#ifdef CONFIG_TRACE_IRQFLAGS
u64 lockdep_stack_trace_count(void);
u64 lockdep_stack_hash_count(void);
#endif
#else
static inline unsigned long
lockdep_count_forward_deps(struct lock_class *class)
{
	return 0;
}
static inline unsigned long
lockdep_count_backward_deps(struct lock_class *class)
{
	return 0;
}
#endif

#ifdef CONFIG_DEBUG_LOCKDEP

#include <asm/local.h>
/*
 * Various lockdep statistics.
 * We want them per cpu as they are often accessed in fast path
 * and we want to avoid too much cache bouncing.
 */
struct lockdep_stats { … };

DECLARE_PER_CPU(struct lockdep_stats, lockdep_stats);

#define __debug_atomic_inc(ptr) …

#define debug_atomic_inc(ptr) …

#define debug_atomic_dec(ptr) …

#define debug_atomic_read(ptr) …

static inline void debug_class_ops_inc(struct lock_class *class)
{ … }

static inline unsigned long debug_class_ops_read(struct lock_class *class)
{ … }

#else
#define __debug_atomic_inc …
#define debug_atomic_inc …
#define debug_atomic_dec …
#define debug_atomic_read …
#define debug_class_ops_inc …
#endif
linux/kernel/locking/lockdep_internals.h
