d588e46155
1,replace %MAX_CIRCULAR_QUE_SIZE with &(MAX_CIRCULAR_QUE_SIZE-1) since we define MAX_CIRCULAR_QUE_SIZE as power of 2; 2,use bitmap to mark if a lock is accessed in BFS in order to clear it quickly, because we may search a graph many times. Signed-off-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1246201486-7308-3-git-send-email-tom.leiming@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
233 lines
6.1 KiB
C
233 lines
6.1 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;
|
|
|
|
#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
|
|
/*
|
|
* Various lockdep statistics:
|
|
*/
|
|
extern atomic_t chain_lookup_hits;
|
|
extern atomic_t chain_lookup_misses;
|
|
extern atomic_t hardirqs_on_events;
|
|
extern atomic_t hardirqs_off_events;
|
|
extern atomic_t redundant_hardirqs_on;
|
|
extern atomic_t redundant_hardirqs_off;
|
|
extern atomic_t softirqs_on_events;
|
|
extern atomic_t softirqs_off_events;
|
|
extern atomic_t redundant_softirqs_on;
|
|
extern atomic_t redundant_softirqs_off;
|
|
extern atomic_t nr_unused_locks;
|
|
extern atomic_t nr_cyclic_checks;
|
|
extern atomic_t nr_cyclic_check_recursions;
|
|
extern atomic_t nr_find_usage_forwards_checks;
|
|
extern atomic_t nr_find_usage_forwards_recursions;
|
|
extern atomic_t nr_find_usage_backwards_checks;
|
|
extern atomic_t nr_find_usage_backwards_recursions;
|
|
# define debug_atomic_inc(ptr) atomic_inc(ptr)
|
|
# define debug_atomic_dec(ptr) atomic_dec(ptr)
|
|
# define debug_atomic_read(ptr) atomic_read(ptr)
|
|
#else
|
|
# define debug_atomic_inc(ptr) do { } while (0)
|
|
# define debug_atomic_dec(ptr) do { } while (0)
|
|
# define debug_atomic_read(ptr) 0
|
|
#endif
|
|
|
|
|
|
extern unsigned long nr_list_entries;
|
|
extern struct lock_list list_entries[MAX_LOCKDEP_ENTRIES];
|
|
extern unsigned long bfs_accessed[];
|
|
|
|
/*For good efficiency of modular, we use power of 2*/
|
|
#define MAX_CIRCULAR_QUE_SIZE 4096UL
|
|
|
|
/* The circular_queue and helpers is used to implement the
|
|
* breadth-first search(BFS)algorithem, by which we can build
|
|
* the shortest path from the next lock to be acquired to the
|
|
* previous held lock if there is a circular between them.
|
|
* */
|
|
struct circular_queue{
|
|
unsigned long element[MAX_CIRCULAR_QUE_SIZE];
|
|
unsigned int front, rear;
|
|
};
|
|
|
|
static inline void __cq_init(struct circular_queue *cq)
|
|
{
|
|
cq->front = cq->rear = 0;
|
|
bitmap_zero(bfs_accessed, MAX_LOCKDEP_ENTRIES);
|
|
}
|
|
|
|
static inline int __cq_empty(struct circular_queue *cq)
|
|
{
|
|
return (cq->front == cq->rear);
|
|
}
|
|
|
|
static inline int __cq_full(struct circular_queue *cq)
|
|
{
|
|
return ((cq->rear + 1)&(MAX_CIRCULAR_QUE_SIZE-1)) == cq->front;
|
|
}
|
|
|
|
static inline int __cq_enqueue(struct circular_queue *cq, unsigned long elem)
|
|
{
|
|
if (__cq_full(cq))
|
|
return -1;
|
|
|
|
cq->element[cq->rear] = elem;
|
|
cq->rear = (cq->rear + 1)&(MAX_CIRCULAR_QUE_SIZE-1);
|
|
return 0;
|
|
}
|
|
|
|
static inline int __cq_dequeue(struct circular_queue *cq, unsigned long *elem)
|
|
{
|
|
if (__cq_empty(cq))
|
|
return -1;
|
|
|
|
*elem = cq->element[cq->front];
|
|
cq->front = (cq->front + 1)&(MAX_CIRCULAR_QUE_SIZE-1);
|
|
return 0;
|
|
}
|
|
|
|
static inline int __cq_get_elem_count(struct circular_queue *cq)
|
|
{
|
|
return (cq->rear - cq->front)&(MAX_CIRCULAR_QUE_SIZE-1);
|
|
}
|
|
|
|
static inline void mark_lock_accessed(struct lock_list *lock,
|
|
struct lock_list *parent)
|
|
{
|
|
unsigned long nr;
|
|
nr = lock - list_entries;
|
|
WARN_ON(nr >= nr_list_entries);
|
|
lock->parent = parent;
|
|
set_bit(nr, bfs_accessed);
|
|
}
|
|
|
|
static inline unsigned long lock_accessed(struct lock_list *lock)
|
|
{
|
|
unsigned long nr;
|
|
nr = lock - list_entries;
|
|
WARN_ON(nr >= nr_list_entries);
|
|
return test_bit(nr, bfs_accessed);
|
|
}
|
|
|
|
static inline struct lock_list *get_lock_parent(struct lock_list *child)
|
|
{
|
|
return child->parent;
|
|
}
|
|
|
|
static inline unsigned long get_lock_depth(struct lock_list *child)
|
|
{
|
|
unsigned long depth = 0;
|
|
struct lock_list *parent;
|
|
|
|
while ((parent = get_lock_parent(child))) {
|
|
child = parent;
|
|
depth++;
|
|
}
|
|
return depth;
|
|
}
|