Something went wrong. Try again.
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266/* SPDX-License-Identifier: GPL-2.0 *//* * kernel/lockdep_internals.h * * Runtime locking correctness validator * * lockdep subsystem internal functions and variables. */
/* * Lock-class usage-state bits: */enum lock_usage_bit {#define LOCKDEP_STATE(__STATE) \ LOCK_USED_IN_##__STATE, \ LOCK_USED_IN_##__STATE##_READ, \ LOCK_ENABLED_##__STATE, \ LOCK_ENABLED_##__STATE##_READ,#include "lockdep_states.h"#undef LOCKDEP_STATE LOCK_USED, LOCK_USED_READ, LOCK_USAGE_STATES,};
/* states after LOCK_USED_READ are not traced and printed */static_assert(LOCK_TRACE_STATES == LOCK_USAGE_STATES);
#define LOCK_USAGE_READ_MASK 1#define LOCK_USAGE_DIR_MASK 2#define LOCK_USAGE_STATE_MASK (~(LOCK_USAGE_READ_MASK | LOCK_USAGE_DIR_MASK))
/* * Usage-state bitmasks: */#define __LOCKF(__STATE) LOCKF_##__STATE = (1 << LOCK_##__STATE),
enum {#define LOCKDEP_STATE(__STATE) \ __LOCKF(USED_IN_##__STATE) \ __LOCKF(USED_IN_##__STATE##_READ) \ __LOCKF(ENABLED_##__STATE) \ __LOCKF(ENABLED_##__STATE##_READ)#include "lockdep_states.h"#undef LOCKDEP_STATE __LOCKF(USED) __LOCKF(USED_READ)};
enum {#define LOCKDEP_STATE(__STATE) LOCKF_ENABLED_##__STATE | LOCKF_ENABLED_IRQ =#include "lockdep_states.h" 0,#undef LOCKDEP_STATE
#define LOCKDEP_STATE(__STATE) LOCKF_USED_IN_##__STATE | LOCKF_USED_IN_IRQ =#include "lockdep_states.h" 0,#undef LOCKDEP_STATE
#define LOCKDEP_STATE(__STATE) LOCKF_ENABLED_##__STATE##_READ | LOCKF_ENABLED_IRQ_READ =#include "lockdep_states.h" 0,#undef LOCKDEP_STATE
#define LOCKDEP_STATE(__STATE) LOCKF_USED_IN_##__STATE##_READ | LOCKF_USED_IN_IRQ_READ =#include "lockdep_states.h" 0,#undef LOCKDEP_STATE};
#define LOCKF_ENABLED_IRQ_ALL (LOCKF_ENABLED_IRQ | LOCKF_ENABLED_IRQ_READ)#define LOCKF_USED_IN_IRQ_ALL (LOCKF_USED_IN_IRQ | LOCKF_USED_IN_IRQ_READ)
#define LOCKF_IRQ (LOCKF_ENABLED_IRQ | LOCKF_USED_IN_IRQ)#define LOCKF_IRQ_READ (LOCKF_ENABLED_IRQ_READ | LOCKF_USED_IN_IRQ_READ)
/* * CONFIG_LOCKDEP_SMALL is defined for sparc. Sparc requires .text, * .data and .bss to fit in required 32MB limit for the kernel. With * CONFIG_LOCKDEP we could go over this limit and cause system boot-up problems. * So, reduce the static allocations for lockdeps related structures so that * everything fits in current required size limit. */#ifdef CONFIG_LOCKDEP_SMALL/* * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies * we track. * * We use the per-lock dependency maps in two ways: we grow it by adding * every to-be-taken lock to all currently held lock's own dependency * table (if it's not there yet), and we check it for lock order * conflicts and deadlocks. */#define MAX_LOCKDEP_ENTRIES 16384UL#define MAX_LOCKDEP_CHAINS_BITS 15#define MAX_STACK_TRACE_ENTRIES 262144UL#define STACK_TRACE_HASH_SIZE 8192#else#define MAX_LOCKDEP_ENTRIES (1UL << CONFIG_LOCKDEP_BITS)
#define MAX_LOCKDEP_CHAINS_BITS CONFIG_LOCKDEP_CHAINS_BITS
/* * Stack-trace: tightly packed array of stack backtrace * addresses. Protected by the hash_lock. */#define MAX_STACK_TRACE_ENTRIES (1UL << CONFIG_LOCKDEP_STACK_TRACE_BITS)#define STACK_TRACE_HASH_SIZE (1 << CONFIG_LOCKDEP_STACK_TRACE_HASH_BITS)#endif
/* * Bit definitions for lock_chain.irq_context */#define LOCK_CHAIN_SOFTIRQ_CONTEXT (1 << 0)#define LOCK_CHAIN_HARDIRQ_CONTEXT (1 << 1)
#define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS)
#define AVG_LOCKDEP_CHAIN_DEPTH 5#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS * AVG_LOCKDEP_CHAIN_DEPTH)
extern struct lock_chain lock_chains[];
#define LOCK_USAGE_CHARS (2*XXX_LOCK_USAGE_STATES + 1)
extern void get_usage_chars(struct lock_class *class, char usage[LOCK_USAGE_CHARS]);
extern const char *__get_key_name(const struct lockdep_subclass_key *key, char *str);
struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);
extern unsigned long nr_lock_classes;extern unsigned long nr_zapped_classes;extern unsigned long nr_zapped_lock_chains;extern unsigned long nr_list_entries;extern unsigned long nr_dynamic_keys;long lockdep_next_lockchain(long i);unsigned long lock_chain_count(void);extern unsigned long nr_stack_trace_entries;
extern unsigned int nr_hardirq_chains;extern unsigned int nr_softirq_chains;extern unsigned int nr_process_chains;extern unsigned int nr_free_chain_hlocks;extern unsigned int nr_lost_chain_hlocks;extern unsigned int nr_large_chain_blocks;
extern unsigned int max_lockdep_depth;extern unsigned int max_bfs_queue_depth;extern unsigned long max_lock_class_idx;
extern struct lock_class lock_classes[MAX_LOCKDEP_KEYS];extern unsigned long lock_classes_in_use[];
#ifdef CONFIG_PROVE_LOCKINGextern unsigned long lockdep_count_forward_deps(struct lock_class *);extern unsigned long lockdep_count_backward_deps(struct lock_class *);#ifdef CONFIG_TRACE_IRQFLAGSu64 lockdep_stack_trace_count(void);u64 lockdep_stack_hash_count(void);#endif#elsestatic inline unsigned longlockdep_count_forward_deps(struct lock_class *class){ return 0;}static inline unsigned longlockdep_count_backward_deps(struct lock_class *class){ return 0;}#endif
#ifdef CONFIG_DEBUG_LOCKDEP
#include <asm/local.h>/* * Various lockdep statistics. * We want them per cpu as they are often accessed in fast path * and we want to avoid too much cache bouncing. */struct lockdep_stats { unsigned long chain_lookup_hits; unsigned int chain_lookup_misses; unsigned long hardirqs_on_events; unsigned long hardirqs_off_events; unsigned long redundant_hardirqs_on; unsigned long redundant_hardirqs_off; unsigned long softirqs_on_events; unsigned long softirqs_off_events; unsigned long redundant_softirqs_on; unsigned long redundant_softirqs_off; int nr_unused_locks; unsigned int nr_redundant_checks; unsigned int nr_redundant; unsigned int nr_cyclic_checks; unsigned int nr_find_usage_forwards_checks; unsigned int nr_find_usage_backwards_checks;
/* * Per lock class locking operation stat counts */ unsigned long lock_class_ops[MAX_LOCKDEP_KEYS];};
DECLARE_PER_CPU(struct lockdep_stats, lockdep_stats);
#define __debug_atomic_inc(ptr) \ this_cpu_inc(lockdep_stats.ptr);
#define debug_atomic_inc(ptr) { \ WARN_ON_ONCE(!irqs_disabled()); \ __this_cpu_inc(lockdep_stats.ptr); \}
#define debug_atomic_dec(ptr) { \ WARN_ON_ONCE(!irqs_disabled()); \ __this_cpu_dec(lockdep_stats.ptr); \}
#define debug_atomic_read(ptr) ({ \ struct lockdep_stats *__cpu_lockdep_stats; \ unsigned long long __total = 0; \ int __cpu; \ for_each_possible_cpu(__cpu) { \ __cpu_lockdep_stats = &per_cpu(lockdep_stats, __cpu); \ __total += __cpu_lockdep_stats->ptr; \ } \ __total; \})
static inline void debug_class_ops_inc(struct lock_class *class){ int idx;
idx = class - lock_classes; __debug_atomic_inc(lock_class_ops[idx]);}
static inline unsigned long debug_class_ops_read(struct lock_class *class){ int idx, cpu; unsigned long ops = 0;
idx = class - lock_classes; for_each_possible_cpu(cpu) ops += per_cpu(lockdep_stats.lock_class_ops[idx], cpu); return ops;}
#else# define __debug_atomic_inc(ptr) do { } while (0)# define debug_atomic_inc(ptr) do { } while (0)# define debug_atomic_dec(ptr) do { } while (0)# define debug_atomic_read(ptr) 0# define debug_class_ops_inc(ptr) do { } while (0)#endif