mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-12 23:33:55 +08:00
54d47a2be5
No need to disable preemption in the debug_atomic_* ops, as we ensure interrupts are disabled already. So let's use the __this_cpu_ops() rather than this_cpu_ops() that enclose the ops in a preempt disabled section. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org>
171 lines
4.5 KiB
C
171 lines
4.5 KiB
C
/*
|
|
* 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_USAGE_STATES
|
|
};
|
|
|
|
/*
|
|
* 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)
|
|
};
|
|
|
|
#define LOCKF_ENABLED_IRQ (LOCKF_ENABLED_HARDIRQ | LOCKF_ENABLED_SOFTIRQ)
|
|
#define LOCKF_USED_IN_IRQ (LOCKF_USED_IN_HARDIRQ | LOCKF_USED_IN_SOFTIRQ)
|
|
|
|
#define LOCKF_ENABLED_IRQ_READ \
|
|
(LOCKF_ENABLED_HARDIRQ_READ | LOCKF_ENABLED_SOFTIRQ_READ)
|
|
#define LOCKF_USED_IN_IRQ_READ \
|
|
(LOCKF_USED_IN_HARDIRQ_READ | LOCKF_USED_IN_SOFTIRQ_READ)
|
|
|
|
/*
|
|
* 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_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS)
|
|
|
|
#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
|
|
|
|
/*
|
|
* Stack-trace: tightly packed array of stack backtrace
|
|
* addresses. Protected by the hash_lock.
|
|
*/
|
|
#define MAX_STACK_TRACE_ENTRIES 262144UL
|
|
|
|
extern struct list_head all_lock_classes;
|
|
extern struct lock_chain lock_chains[];
|
|
|
|
#define LOCK_USAGE_CHARS (1+LOCK_USAGE_STATES/2)
|
|
|
|
extern void get_usage_chars(struct lock_class *class,
|
|
char usage[LOCK_USAGE_CHARS]);
|
|
|
|
extern const char * __get_key_name(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_list_entries;
|
|
extern unsigned long nr_lock_chains;
|
|
extern int nr_chain_hlocks;
|
|
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 max_lockdep_depth;
|
|
extern unsigned int max_recursion_depth;
|
|
|
|
extern unsigned int max_bfs_queue_depth;
|
|
|
|
#ifdef CONFIG_PROVE_LOCKING
|
|
extern unsigned long lockdep_count_forward_deps(struct lock_class *);
|
|
extern unsigned long lockdep_count_backward_deps(struct lock_class *);
|
|
#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 {
|
|
int chain_lookup_hits;
|
|
int chain_lookup_misses;
|
|
int hardirqs_on_events;
|
|
int hardirqs_off_events;
|
|
int redundant_hardirqs_on;
|
|
int redundant_hardirqs_off;
|
|
int softirqs_on_events;
|
|
int softirqs_off_events;
|
|
int redundant_softirqs_on;
|
|
int redundant_softirqs_off;
|
|
int nr_unused_locks;
|
|
int nr_cyclic_checks;
|
|
int nr_cyclic_check_recursions;
|
|
int nr_find_usage_forwards_checks;
|
|
int nr_find_usage_forwards_recursions;
|
|
int nr_find_usage_backwards_checks;
|
|
int nr_find_usage_backwards_recursions;
|
|
};
|
|
|
|
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; \
|
|
})
|
|
#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
|
|
#endif
|