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 */
12 enum 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
29 enum {
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
70 extern struct list_head all_lock_classes;
71 extern struct lock_chain lock_chains[];
72
73 #define LOCK_USAGE_CHARS (1+LOCK_USAGE_STATES/2)
74
75 extern void get_usage_chars(struct lock_class *class,
76 char usage[LOCK_USAGE_CHARS]);
77
78 extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
79
80 struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);
81
82 extern unsigned long nr_lock_classes;
83 extern unsigned long nr_list_entries;
84 extern unsigned long nr_lock_chains;
85 extern int nr_chain_hlocks;
86 extern unsigned long nr_stack_trace_entries;
87
88 extern unsigned int nr_hardirq_chains;
89 extern unsigned int nr_softirq_chains;
90 extern unsigned int nr_process_chains;
91 extern unsigned int max_lockdep_depth;
92 extern unsigned int max_recursion_depth;
93
94 #ifdef CONFIG_PROVE_LOCKING
95 extern unsigned long lockdep_count_forward_deps(struct lock_class *);
96 extern unsigned long lockdep_count_backward_deps(struct lock_class *);
97 #else
98 static inline unsigned long
99 lockdep_count_forward_deps(struct lock_class *class)
100 {
101 return 0;
102 }
103 static inline unsigned long
104 lockdep_count_backward_deps(struct lock_class *class)
105 {
106 return 0;
107 }
108 #endif
109
110 #ifdef CONFIG_DEBUG_LOCKDEP
111 /*
112 * Various lockdep statistics:
113 */
114 extern atomic_t chain_lookup_hits;
115 extern atomic_t chain_lookup_misses;
116 extern atomic_t hardirqs_on_events;
117 extern atomic_t hardirqs_off_events;
118 extern atomic_t redundant_hardirqs_on;
119 extern atomic_t redundant_hardirqs_off;
120 extern atomic_t softirqs_on_events;
121 extern atomic_t softirqs_off_events;
122 extern atomic_t redundant_softirqs_on;
123 extern atomic_t redundant_softirqs_off;
124 extern atomic_t nr_unused_locks;
125 extern atomic_t nr_cyclic_checks;
126 extern atomic_t nr_cyclic_check_recursions;
127 extern atomic_t nr_find_usage_forwards_checks;
128 extern atomic_t nr_find_usage_forwards_recursions;
129 extern atomic_t nr_find_usage_backwards_checks;
130 extern atomic_t nr_find_usage_backwards_recursions;
131 # define debug_atomic_inc(ptr) atomic_inc(ptr)
132 # define debug_atomic_dec(ptr) atomic_dec(ptr)
133 # define debug_atomic_read(ptr) atomic_read(ptr)
134 #else
135 # define debug_atomic_inc(ptr) do { } while (0)
136 # define debug_atomic_dec(ptr) do { } while (0)
137 # define debug_atomic_read(ptr) 0
138 #endif
139
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