The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/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  */
   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

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