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 * CONFIG_LOCKDEP_SMALL is defined for sparc. Sparc requires .text, 50 * .data and .bss to fit in required 32MB limit for the kernel. With 51 * CONFIG_LOCKDEP we could go over this limit and cause system boot-up problems. 52 * So, reduce the static allocations for lockdeps related structures so that 53 * everything fits in current required size limit. 54 */ 55 #ifdef CONFIG_LOCKDEP_SMALL 56 /* 57 * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies 58 * we track. 59 * 60 * We use the per-lock dependency maps in two ways: we grow it by adding 61 * every to-be-taken lock to all currently held lock's own dependency 62 * table (if it's not there yet), and we check it for lock order 63 * conflicts and deadlocks. 64 */ 65 #define MAX_LOCKDEP_ENTRIES 16384UL 66 #define MAX_LOCKDEP_CHAINS_BITS 15 67 #define MAX_STACK_TRACE_ENTRIES 262144UL 68 #else 69 #define MAX_LOCKDEP_ENTRIES 32768UL 70 71 #define MAX_LOCKDEP_CHAINS_BITS 16 72 73 /* 74 * Stack-trace: tightly packed array of stack backtrace 75 * addresses. Protected by the hash_lock. 76 */ 77 #define MAX_STACK_TRACE_ENTRIES 524288UL 78 #endif 79 80 #define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS) 81 82 #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5) 83 84 extern struct list_head all_lock_classes; 85 extern struct lock_chain lock_chains[]; 86 87 #define LOCK_USAGE_CHARS (1+LOCK_USAGE_STATES/2) 88 89 extern void get_usage_chars(struct lock_class *class, 90 char usage[LOCK_USAGE_CHARS]); 91 92 extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str); 93 94 struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i); 95 96 extern unsigned long nr_lock_classes; 97 extern unsigned long nr_list_entries; 98 extern unsigned long nr_lock_chains; 99 extern int nr_chain_hlocks; 100 extern unsigned long nr_stack_trace_entries; 101 102 extern unsigned int nr_hardirq_chains; 103 extern unsigned int nr_softirq_chains; 104 extern unsigned int nr_process_chains; 105 extern unsigned int max_lockdep_depth; 106 extern unsigned int max_recursion_depth; 107 108 extern unsigned int max_bfs_queue_depth; 109 110 #ifdef CONFIG_PROVE_LOCKING 111 extern unsigned long lockdep_count_forward_deps(struct lock_class *); 112 extern unsigned long lockdep_count_backward_deps(struct lock_class *); 113 #else 114 static inline unsigned long 115 lockdep_count_forward_deps(struct lock_class *class) 116 { 117 return 0; 118 } 119 static inline unsigned long 120 lockdep_count_backward_deps(struct lock_class *class) 121 { 122 return 0; 123 } 124 #endif 125 126 #ifdef CONFIG_DEBUG_LOCKDEP 127 128 #include <asm/local.h> 129 /* 130 * Various lockdep statistics. 131 * We want them per cpu as they are often accessed in fast path 132 * and we want to avoid too much cache bouncing. 133 */ 134 struct lockdep_stats { 135 int chain_lookup_hits; 136 int chain_lookup_misses; 137 int hardirqs_on_events; 138 int hardirqs_off_events; 139 int redundant_hardirqs_on; 140 int redundant_hardirqs_off; 141 int softirqs_on_events; 142 int softirqs_off_events; 143 int redundant_softirqs_on; 144 int redundant_softirqs_off; 145 int nr_unused_locks; 146 int nr_cyclic_checks; 147 int nr_cyclic_check_recursions; 148 int nr_find_usage_forwards_checks; 149 int nr_find_usage_forwards_recursions; 150 int nr_find_usage_backwards_checks; 151 int nr_find_usage_backwards_recursions; 152 }; 153 154 DECLARE_PER_CPU(struct lockdep_stats, lockdep_stats); 155 156 #define __debug_atomic_inc(ptr) \ 157 this_cpu_inc(lockdep_stats.ptr); 158 159 #define debug_atomic_inc(ptr) { \ 160 WARN_ON_ONCE(!irqs_disabled()); \ 161 __this_cpu_inc(lockdep_stats.ptr); \ 162 } 163 164 #define debug_atomic_dec(ptr) { \ 165 WARN_ON_ONCE(!irqs_disabled()); \ 166 __this_cpu_dec(lockdep_stats.ptr); \ 167 } 168 169 #define debug_atomic_read(ptr) ({ \ 170 struct lockdep_stats *__cpu_lockdep_stats; \ 171 unsigned long long __total = 0; \ 172 int __cpu; \ 173 for_each_possible_cpu(__cpu) { \ 174 __cpu_lockdep_stats = &per_cpu(lockdep_stats, __cpu); \ 175 __total += __cpu_lockdep_stats->ptr; \ 176 } \ 177 __total; \ 178 }) 179 #else 180 # define __debug_atomic_inc(ptr) do { } while (0) 181 # define debug_atomic_inc(ptr) do { } while (0) 182 # define debug_atomic_dec(ptr) do { } while (0) 183 # define debug_atomic_read(ptr) 0 184 #endif 185