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28 * from BSDI Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp
35 #include <sys/queue.h>
36 #include <sys/_lock.h>
37 #include <sys/ktr_class.h>
39 struct lock_list_entry;
43 * Lock classes. Each lock has a class which describes characteristics
44 * common to all types of locks of a given class.
46 * Spin locks in general must always protect against preemption, as it is
47 * an error to perform any type of context switch while holding a spin lock.
48 * Also, for an individual lock to be recursable, its class must allow
49 * recursion and the lock itself must explicitly allow recursion.
51 * The 'lc_ddb_show' function pointer is used to dump class-specific
52 * data for the 'show lock' DDB command. The 'lc_lock' and
53 * 'lc_unlock' function pointers are used in sleep(9) and cv_wait(9)
54 * to lock and unlock locks while blocking on a sleep queue. The
55 * return value of 'lc_unlock' will be passed to 'lc_lock' on resume
56 * to allow communication of state between the two routines.
62 void (*lc_assert)(const struct lock_object *lock, int what);
63 void (*lc_ddb_show)(const struct lock_object *lock);
64 void (*lc_lock)(struct lock_object *lock, uintptr_t how);
65 int (*lc_owner)(const struct lock_object *lock,
66 struct thread **owner);
67 uintptr_t (*lc_unlock)(struct lock_object *lock);
70 #define LC_SLEEPLOCK 0x00000001 /* Sleep lock. */
71 #define LC_SPINLOCK 0x00000002 /* Spin lock. */
72 #define LC_SLEEPABLE 0x00000004 /* Sleeping allowed with this lock. */
73 #define LC_RECURSABLE 0x00000008 /* Locks of this type may recurse. */
74 #define LC_UPGRADABLE 0x00000010 /* Upgrades and downgrades permitted. */
76 #define LO_CLASSFLAGS 0x0000ffff /* Class specific flags. */
77 #define LO_INITIALIZED 0x00010000 /* Lock has been initialized. */
78 #define LO_WITNESS 0x00020000 /* Should witness monitor this lock. */
79 #define LO_QUIET 0x00040000 /* Don't log locking operations. */
80 #define LO_RECURSABLE 0x00080000 /* Lock may recurse. */
81 #define LO_SLEEPABLE 0x00100000 /* Lock may be held while sleeping. */
82 #define LO_UPGRADABLE 0x00200000 /* Lock may be upgraded/downgraded. */
83 #define LO_DUPOK 0x00400000 /* Don't check for duplicate acquires */
84 #define LO_IS_VNODE 0x00800000 /* Tell WITNESS about a VNODE lock */
85 #define LO_CLASSMASK 0x0f000000 /* Class index bitmask. */
86 #define LO_NOPROFILE 0x10000000 /* Don't profile this lock */
87 #define LO_NEW 0x20000000 /* Don't check for double-init */
90 * Lock classes are statically assigned an index into the gobal lock_classes
91 * array. Debugging code looks up the lock class for a given lock object
92 * by indexing the array.
94 #define LO_CLASSSHIFT 24
95 #define LO_CLASSINDEX(lock) ((((lock)->lo_flags) & LO_CLASSMASK) >> LO_CLASSSHIFT)
96 #define LOCK_CLASS(lock) (lock_classes[LO_CLASSINDEX((lock))])
97 #define LOCK_CLASS_MAX (LO_CLASSMASK >> LO_CLASSSHIFT)
100 * Option flags passed to lock operations that witness also needs to know
101 * about or that are generic across all locks.
103 #define LOP_NEWORDER 0x00000001 /* Define a new lock order. */
104 #define LOP_QUIET 0x00000002 /* Don't log locking operations. */
105 #define LOP_TRYLOCK 0x00000004 /* Don't check lock order. */
106 #define LOP_EXCLUSIVE 0x00000008 /* Exclusive lock. */
107 #define LOP_DUPOK 0x00000010 /* Don't check for duplicate acquires */
109 /* Flags passed to witness_assert. */
110 #define LA_MASKASSERT 0x000000ff /* Mask for witness defined asserts. */
111 #define LA_UNLOCKED 0x00000000 /* Lock is unlocked. */
112 #define LA_LOCKED 0x00000001 /* Lock is at least share locked. */
113 #define LA_SLOCKED 0x00000002 /* Lock is exactly share locked. */
114 #define LA_XLOCKED 0x00000004 /* Lock is exclusively locked. */
115 #define LA_RECURSED 0x00000008 /* Lock is recursed. */
116 #define LA_NOTRECURSED 0x00000010 /* Lock is not recursed. */
120 * If any of WITNESS, INVARIANTS, or KTR_LOCK KTR tracing has been enabled,
121 * then turn on LOCK_DEBUG. When this option is on, extra debugging
122 * facilities such as tracking the file and line number of lock operations
123 * are enabled. Also, mutex locking operations are not inlined to avoid
124 * bloat from all the extra debugging code. We also have to turn on all the
125 * calling conventions for this debugging code in modules so that modules can
126 * work with both debug and non-debug kernels.
128 #if defined(KLD_MODULE) || defined(WITNESS) || defined(INVARIANTS) || \
129 defined(LOCK_PROFILING) || defined(KTR)
136 * In the LOCK_DEBUG case, use the filename and line numbers for debugging
137 * operations. Otherwise, use default values to avoid the unneeded bloat.
140 #define LOCK_FILE __FILE__
141 #define LOCK_LINE __LINE__
143 #define LOCK_FILE NULL
148 * Macros for KTR_LOCK tracing.
150 * opname - name of this operation (LOCK/UNLOCK/SLOCK, etc.)
151 * lo - struct lock_object * for this lock
152 * flags - flags passed to the lock operation
153 * recurse - this locks recursion level (or 0 if class is not recursable)
154 * result - result of a try lock operation
159 #define LOCK_LOG_TEST(lo, flags) \
160 (((flags) & LOP_QUIET) == 0 && ((lo)->lo_flags & LO_QUIET) == 0)
162 #define LOCK_LOG_TEST(lo, flags) 0
166 #define LOCK_LOG_LOCK(opname, lo, flags, recurse, file, line) do { \
167 if (LOCK_LOG_TEST((lo), (flags))) \
168 CTR6(KTR_LOCK, opname " (%s) %s %p r = %d at %s:%d", \
169 LOCK_CLASS(lo)->lc_name, (lo)->lo_name, \
170 (lo), (u_int)(recurse), (file), (line)); \
173 #define LOCK_LOG_TRY(opname, lo, flags, result, file, line) do { \
174 if (LOCK_LOG_TEST((lo), (flags))) \
175 CTR6(KTR_LOCK, "TRY_" opname " (%s) %s %p result=%d at %s:%d",\
176 LOCK_CLASS(lo)->lc_name, (lo)->lo_name, \
177 (lo), (u_int)(result), (file), (line)); \
180 #define LOCK_LOG_INIT(lo, flags) do { \
181 if (LOCK_LOG_TEST((lo), (flags))) \
182 CTR4(KTR_LOCK, "%s: %p (%s) %s", __func__, (lo), \
183 LOCK_CLASS(lo)->lc_name, (lo)->lo_name); \
186 #define LOCK_LOG_DESTROY(lo, flags) LOCK_LOG_INIT(lo, flags)
188 #define lock_initialized(lo) ((lo)->lo_flags & LO_INITIALIZED)
191 * Helpful macros for quickly coming up with assertions with informative
194 #define MPASS(ex) MPASS4(ex, #ex, __FILE__, __LINE__)
195 #define MPASS2(ex, what) MPASS4(ex, what, __FILE__, __LINE__)
196 #define MPASS3(ex, file, line) MPASS4(ex, #ex, file, line)
197 #define MPASS4(ex, what, file, line) \
198 KASSERT((ex), ("Assertion %s failed at %s:%d", what, file, line))
200 extern struct lock_class lock_class_mtx_sleep;
201 extern struct lock_class lock_class_mtx_spin;
202 extern struct lock_class lock_class_sx;
203 extern struct lock_class lock_class_rw;
204 extern struct lock_class lock_class_rm;
205 extern struct lock_class lock_class_rm_sleepable;
206 extern struct lock_class lock_class_lockmgr;
208 extern struct lock_class *lock_classes[];
210 struct lock_delay_config {
215 struct lock_delay_arg {
216 struct lock_delay_config *config;
222 lock_delay_arg_init(struct lock_delay_arg *la, struct lock_delay_config *lc)
225 la->delay = lc->base;
229 #define lock_delay_spin(n) do { \
232 for (_i = (n); _i > 0; _i--) \
236 #define LOCK_DELAY_SYSINIT(func) \
237 SYSINIT(func##_ld, SI_SUB_LOCK, SI_ORDER_ANY, func, NULL)
239 #define LOCK_DELAY_SYSINIT_DEFAULT(lc) \
240 SYSINIT(lock_delay_##lc##_ld, SI_SUB_LOCK, SI_ORDER_ANY, \
241 lock_delay_default_init, &lc)
243 void lock_init(struct lock_object *, struct lock_class *,
244 const char *, const char *, int);
245 void lock_destroy(struct lock_object *);
246 void lock_delay(struct lock_delay_arg *);
247 void lock_delay_default_init(struct lock_delay_config *);
248 void spinlock_enter(void);
249 void spinlock_exit(void);
250 void witness_init(struct lock_object *, const char *);
251 void witness_destroy(struct lock_object *);
252 int witness_defineorder(struct lock_object *, struct lock_object *);
253 void witness_checkorder(struct lock_object *, int, const char *, int,
254 struct lock_object *);
255 void witness_lock(struct lock_object *, int, const char *, int);
256 void witness_upgrade(struct lock_object *, int, const char *, int);
257 void witness_downgrade(struct lock_object *, int, const char *, int);
258 void witness_unlock(struct lock_object *, int, const char *, int);
259 void witness_save(struct lock_object *, const char **, int *);
260 void witness_restore(struct lock_object *, const char *, int);
261 int witness_list_locks(struct lock_list_entry **,
262 int (*)(const char *, ...));
263 int witness_warn(int, struct lock_object *, const char *, ...);
264 void witness_assert(const struct lock_object *, int, const char *, int);
265 void witness_display_spinlock(struct lock_object *, struct thread *,
266 int (*)(const char *, ...));
267 int witness_line(struct lock_object *);
268 void witness_norelease(struct lock_object *);
269 void witness_releaseok(struct lock_object *);
270 const char *witness_file(struct lock_object *);
271 void witness_thread_exit(struct thread *);
275 /* Flags for witness_warn(). */
276 #define WARN_GIANTOK 0x01 /* Giant is exempt from this check. */
277 #define WARN_PANIC 0x02 /* Panic if check fails. */
278 #define WARN_SLEEPOK 0x04 /* Sleepable locks are exempt from check. */
280 #define WITNESS_INIT(lock, type) \
281 witness_init((lock), (type))
283 #define WITNESS_DESTROY(lock) \
284 witness_destroy(lock)
286 #define WITNESS_CHECKORDER(lock, flags, file, line, interlock) \
287 witness_checkorder((lock), (flags), (file), (line), (interlock))
289 #define WITNESS_DEFINEORDER(lock1, lock2) \
290 witness_defineorder((struct lock_object *)(lock1), \
291 (struct lock_object *)(lock2))
293 #define WITNESS_LOCK(lock, flags, file, line) \
294 witness_lock((lock), (flags), (file), (line))
296 #define WITNESS_UPGRADE(lock, flags, file, line) \
297 witness_upgrade((lock), (flags), (file), (line))
299 #define WITNESS_DOWNGRADE(lock, flags, file, line) \
300 witness_downgrade((lock), (flags), (file), (line))
302 #define WITNESS_UNLOCK(lock, flags, file, line) \
303 witness_unlock((lock), (flags), (file), (line))
305 #define WITNESS_CHECK(flags, lock, fmt, ...) \
306 witness_warn((flags), (lock), (fmt), ## __VA_ARGS__)
308 #define WITNESS_WARN(flags, lock, fmt, ...) \
309 witness_warn((flags), (lock), (fmt), ## __VA_ARGS__)
311 #define WITNESS_SAVE_DECL(n) \
312 const char * __CONCAT(n, __wf); \
313 int __CONCAT(n, __wl)
315 #define WITNESS_SAVE(lock, n) \
316 witness_save((lock), &__CONCAT(n, __wf), &__CONCAT(n, __wl))
318 #define WITNESS_RESTORE(lock, n) \
319 witness_restore((lock), __CONCAT(n, __wf), __CONCAT(n, __wl))
321 #define WITNESS_NORELEASE(lock) \
322 witness_norelease(&(lock)->lock_object)
324 #define WITNESS_RELEASEOK(lock) \
325 witness_releaseok(&(lock)->lock_object)
327 #define WITNESS_FILE(lock) \
330 #define WITNESS_LINE(lock) \
334 #define WITNESS_INIT(lock, type) (void)0
335 #define WITNESS_DESTROY(lock) (void)0
336 #define WITNESS_DEFINEORDER(lock1, lock2) 0
337 #define WITNESS_CHECKORDER(lock, flags, file, line, interlock) (void)0
338 #define WITNESS_LOCK(lock, flags, file, line) (void)0
339 #define WITNESS_UPGRADE(lock, flags, file, line) (void)0
340 #define WITNESS_DOWNGRADE(lock, flags, file, line) (void)0
341 #define WITNESS_UNLOCK(lock, flags, file, line) (void)0
342 #define WITNESS_CHECK(flags, lock, fmt, ...) 0
343 #define WITNESS_WARN(flags, lock, fmt, ...) (void)0
344 #define WITNESS_SAVE_DECL(n) (void)0
345 #define WITNESS_SAVE(lock, n) (void)0
346 #define WITNESS_RESTORE(lock, n) (void)0
347 #define WITNESS_NORELEASE(lock) (void)0
348 #define WITNESS_RELEASEOK(lock) (void)0
349 #define WITNESS_FILE(lock) ("?")
350 #define WITNESS_LINE(lock) (0)
354 #endif /* _SYS_LOCK_H_ */