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 32768UL 58 59 #define MAX_LOCKDEP_CHAINS_BITS 16 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 524288UL 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 171