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- /* 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)
- };
- #define LOCKDEP_STATE(__STATE) LOCKF_ENABLED_##__STATE |
- static const unsigned long LOCKF_ENABLED_IRQ =
- #include "lockdep_states.h"
- 0;
- #undef LOCKDEP_STATE
- #define LOCKDEP_STATE(__STATE) LOCKF_USED_IN_##__STATE |
- static const unsigned long LOCKF_USED_IN_IRQ =
- #include "lockdep_states.h"
- 0;
- #undef LOCKDEP_STATE
- #define LOCKDEP_STATE(__STATE) LOCKF_ENABLED_##__STATE##_READ |
- static const unsigned long LOCKF_ENABLED_IRQ_READ =
- #include "lockdep_states.h"
- 0;
- #undef LOCKDEP_STATE
- #define LOCKDEP_STATE(__STATE) LOCKF_USED_IN_##__STATE##_READ |
- static const unsigned long 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 32768UL
- #define MAX_LOCKDEP_CHAINS_BITS 16
- /*
- * Stack-trace: tightly packed array of stack backtrace
- * addresses. Protected by the hash_lock.
- */
- #define MAX_STACK_TRACE_ENTRIES 524288UL
- #define STACK_TRACE_HASH_SIZE 16384
- #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 MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
- 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;
- 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_LOCKING
- extern unsigned long lockdep_count_forward_deps(struct lock_class *);
- extern unsigned long lockdep_count_backward_deps(struct lock_class *);
- #ifdef CONFIG_TRACE_IRQFLAGS
- u64 lockdep_stack_trace_count(void);
- u64 lockdep_stack_hash_count(void);
- #endif
- #else
- static inline unsigned long
- lockdep_count_forward_deps(struct lock_class *class)
- {
- return 0;
- }
- static inline unsigned long
- lockdep_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
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