linux/kernel/lockdep_internals.h
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   1/*
   2 * kernel/lockdep_internals.h
   3 *
   4 * Runtime locking correctness validator
   5 *
   6 * lockdep subsystem internal functions and variables.
   7 */
   8
   9/*
  10 * Lock-class usage-state bits:
  11 */
  12enum lock_usage_bit {
  13#define LOCKDEP_STATE(__STATE)          \
  14        LOCK_USED_IN_##__STATE,         \
  15        LOCK_USED_IN_##__STATE##_READ,  \
  16        LOCK_ENABLED_##__STATE,         \
  17        LOCK_ENABLED_##__STATE##_READ,
  18#include "lockdep_states.h"
  19#undef LOCKDEP_STATE
  20        LOCK_USED,
  21        LOCK_USAGE_STATES
  22};
  23
  24/*
  25 * Usage-state bitmasks:
  26 */
  27#define __LOCKF(__STATE)        LOCKF_##__STATE = (1 << LOCK_##__STATE),
  28
  29enum {
  30#define LOCKDEP_STATE(__STATE)                                          \
  31        __LOCKF(USED_IN_##__STATE)                                      \
  32        __LOCKF(USED_IN_##__STATE##_READ)                               \
  33        __LOCKF(ENABLED_##__STATE)                                      \
  34        __LOCKF(ENABLED_##__STATE##_READ)
  35#include "lockdep_states.h"
  36#undef LOCKDEP_STATE
  37        __LOCKF(USED)
  38};
  39
  40#define LOCKF_ENABLED_IRQ (LOCKF_ENABLED_HARDIRQ | LOCKF_ENABLED_SOFTIRQ)
  41#define LOCKF_USED_IN_IRQ (LOCKF_USED_IN_HARDIRQ | LOCKF_USED_IN_SOFTIRQ)
  42
  43#define LOCKF_ENABLED_IRQ_READ \
  44                (LOCKF_ENABLED_HARDIRQ_READ | LOCKF_ENABLED_SOFTIRQ_READ)
  45#define LOCKF_USED_IN_IRQ_READ \
  46                (LOCKF_USED_IN_HARDIRQ_READ | LOCKF_USED_IN_SOFTIRQ_READ)
  47
  48/*
  49 * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies
  50 * we track.
  51 *
  52 * We use the per-lock dependency maps in two ways: we grow it by adding
  53 * every to-be-taken lock to all currently held lock's own dependency
  54 * table (if it's not there yet), and we check it for lock order
  55 * conflicts and deadlocks.
  56 */
  57#define MAX_LOCKDEP_ENTRIES     16384UL
  58
  59#define MAX_LOCKDEP_CHAINS_BITS 15
  60#define MAX_LOCKDEP_CHAINS      (1UL << MAX_LOCKDEP_CHAINS_BITS)
  61
  62#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
  63
  64/*
  65 * Stack-trace: tightly packed array of stack backtrace
  66 * addresses. Protected by the hash_lock.
  67 */
  68#define MAX_STACK_TRACE_ENTRIES 262144UL
  69
  70extern struct list_head all_lock_classes;
  71extern struct lock_chain lock_chains[];
  72
  73#define LOCK_USAGE_CHARS (1+LOCK_USAGE_STATES/2)
  74
  75extern void get_usage_chars(struct lock_class *class,
  76                            char usage[LOCK_USAGE_CHARS]);
  77
  78extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
  79
  80struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);
  81
  82extern unsigned long nr_lock_classes;
  83extern unsigned long nr_list_entries;
  84extern unsigned long nr_lock_chains;
  85extern int nr_chain_hlocks;
  86extern unsigned long nr_stack_trace_entries;
  87
  88extern unsigned int nr_hardirq_chains;
  89extern unsigned int nr_softirq_chains;
  90extern unsigned int nr_process_chains;
  91extern unsigned int max_lockdep_depth;
  92extern unsigned int max_recursion_depth;
  93
  94extern unsigned int max_bfs_queue_depth;
  95
  96#ifdef CONFIG_PROVE_LOCKING
  97extern unsigned long lockdep_count_forward_deps(struct lock_class *);
  98extern unsigned long lockdep_count_backward_deps(struct lock_class *);
  99#else
 100static inline unsigned long
 101lockdep_count_forward_deps(struct lock_class *class)
 102{
 103        return 0;
 104}
 105static inline unsigned long
 106lockdep_count_backward_deps(struct lock_class *class)
 107{
 108        return 0;
 109}
 110#endif
 111
 112#ifdef CONFIG_DEBUG_LOCKDEP
 113/*
 114 * Various lockdep statistics:
 115 */
 116extern atomic_t chain_lookup_hits;
 117extern atomic_t chain_lookup_misses;
 118extern atomic_t hardirqs_on_events;
 119extern atomic_t hardirqs_off_events;
 120extern atomic_t redundant_hardirqs_on;
 121extern atomic_t redundant_hardirqs_off;
 122extern atomic_t softirqs_on_events;
 123extern atomic_t softirqs_off_events;
 124extern atomic_t redundant_softirqs_on;
 125extern atomic_t redundant_softirqs_off;
 126extern atomic_t nr_unused_locks;
 127extern atomic_t nr_cyclic_checks;
 128extern atomic_t nr_cyclic_check_recursions;
 129extern atomic_t nr_find_usage_forwards_checks;
 130extern atomic_t nr_find_usage_forwards_recursions;
 131extern atomic_t nr_find_usage_backwards_checks;
 132extern atomic_t nr_find_usage_backwards_recursions;
 133# define debug_atomic_inc(ptr)          atomic_inc(ptr)
 134# define debug_atomic_dec(ptr)          atomic_dec(ptr)
 135# define debug_atomic_read(ptr)         atomic_read(ptr)
 136#else
 137# define debug_atomic_inc(ptr)          do { } while (0)
 138# define debug_atomic_dec(ptr)          do { } while (0)
 139# define debug_atomic_read(ptr)         0
 140#endif
 141