arm: tegra: register save and restore ops
[linux-3.10.git] / kernel / lockdep_internals.h
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 extern unsigned int max_bfs_queue_depth;
95
96 #ifdef CONFIG_PROVE_LOCKING
97 extern unsigned long lockdep_count_forward_deps(struct lock_class *);
98 extern unsigned long lockdep_count_backward_deps(struct lock_class *);
99 #else
100 static inline unsigned long
101 lockdep_count_forward_deps(struct lock_class *class)
102 {
103         return 0;
104 }
105 static inline unsigned long
106 lockdep_count_backward_deps(struct lock_class *class)
107 {
108         return 0;
109 }
110 #endif
111
112 #ifdef CONFIG_DEBUG_LOCKDEP
113
114 #include <asm/local.h>
115 /*
116  * Various lockdep statistics.
117  * We want them per cpu as they are often accessed in fast path
118  * and we want to avoid too much cache bouncing.
119  */
120 struct lockdep_stats {
121         int     chain_lookup_hits;
122         int     chain_lookup_misses;
123         int     hardirqs_on_events;
124         int     hardirqs_off_events;
125         int     redundant_hardirqs_on;
126         int     redundant_hardirqs_off;
127         int     softirqs_on_events;
128         int     softirqs_off_events;
129         int     redundant_softirqs_on;
130         int     redundant_softirqs_off;
131         int     nr_unused_locks;
132         int     nr_cyclic_checks;
133         int     nr_cyclic_check_recursions;
134         int     nr_find_usage_forwards_checks;
135         int     nr_find_usage_forwards_recursions;
136         int     nr_find_usage_backwards_checks;
137         int     nr_find_usage_backwards_recursions;
138 };
139
140 DECLARE_PER_CPU(struct lockdep_stats, lockdep_stats);
141
142 #define __debug_atomic_inc(ptr)                                 \
143         this_cpu_inc(lockdep_stats.ptr);
144
145 #define debug_atomic_inc(ptr)                   {               \
146         WARN_ON_ONCE(!irqs_disabled());                         \
147         __this_cpu_inc(lockdep_stats.ptr);                      \
148 }
149
150 #define debug_atomic_dec(ptr)                   {               \
151         WARN_ON_ONCE(!irqs_disabled());                         \
152         __this_cpu_dec(lockdep_stats.ptr);                      \
153 }
154
155 #define debug_atomic_read(ptr)          ({                              \
156         struct lockdep_stats *__cpu_lockdep_stats;                      \
157         unsigned long long __total = 0;                                 \
158         int __cpu;                                                      \
159         for_each_possible_cpu(__cpu) {                                  \
160                 __cpu_lockdep_stats = &per_cpu(lockdep_stats, __cpu);   \
161                 __total += __cpu_lockdep_stats->ptr;                    \
162         }                                                               \
163         __total;                                                        \
164 })
165 #else
166 # define __debug_atomic_inc(ptr)        do { } while (0)
167 # define debug_atomic_inc(ptr)          do { } while (0)
168 # define debug_atomic_dec(ptr)          do { } while (0)
169 # define debug_atomic_read(ptr)         0
170 #endif