Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Runtime locking correctness validator |
| 3 | * |
Peter Zijlstra | 4b32d0a | 2007-07-19 01:48:59 -0700 | [diff] [blame] | 4 | * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> |
| 5 | * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com> |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 6 | * |
| 7 | * see Documentation/lockdep-design.txt for more details. |
| 8 | */ |
| 9 | #ifndef __LINUX_LOCKDEP_H |
| 10 | #define __LINUX_LOCKDEP_H |
| 11 | |
Heiko Carstens | a1e96b0 | 2007-02-12 00:52:20 -0800 | [diff] [blame] | 12 | struct task_struct; |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 13 | struct lockdep_map; |
Heiko Carstens | a1e96b0 | 2007-02-12 00:52:20 -0800 | [diff] [blame] | 14 | |
Michael S. Tsirkin | db0b0ea | 2006-09-29 01:59:28 -0700 | [diff] [blame] | 15 | #ifdef CONFIG_LOCKDEP |
| 16 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 17 | #include <linux/linkage.h> |
| 18 | #include <linux/list.h> |
| 19 | #include <linux/debug_locks.h> |
| 20 | #include <linux/stacktrace.h> |
| 21 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 22 | /* |
| 23 | * Lock-class usage-state bits: |
| 24 | */ |
| 25 | enum lock_usage_bit |
| 26 | { |
| 27 | LOCK_USED = 0, |
| 28 | LOCK_USED_IN_HARDIRQ, |
| 29 | LOCK_USED_IN_SOFTIRQ, |
| 30 | LOCK_ENABLED_SOFTIRQS, |
| 31 | LOCK_ENABLED_HARDIRQS, |
| 32 | LOCK_USED_IN_HARDIRQ_READ, |
| 33 | LOCK_USED_IN_SOFTIRQ_READ, |
| 34 | LOCK_ENABLED_SOFTIRQS_READ, |
| 35 | LOCK_ENABLED_HARDIRQS_READ, |
| 36 | LOCK_USAGE_STATES |
| 37 | }; |
| 38 | |
| 39 | /* |
| 40 | * Usage-state bitmasks: |
| 41 | */ |
| 42 | #define LOCKF_USED (1 << LOCK_USED) |
| 43 | #define LOCKF_USED_IN_HARDIRQ (1 << LOCK_USED_IN_HARDIRQ) |
| 44 | #define LOCKF_USED_IN_SOFTIRQ (1 << LOCK_USED_IN_SOFTIRQ) |
| 45 | #define LOCKF_ENABLED_HARDIRQS (1 << LOCK_ENABLED_HARDIRQS) |
| 46 | #define LOCKF_ENABLED_SOFTIRQS (1 << LOCK_ENABLED_SOFTIRQS) |
| 47 | |
| 48 | #define LOCKF_ENABLED_IRQS (LOCKF_ENABLED_HARDIRQS | LOCKF_ENABLED_SOFTIRQS) |
| 49 | #define LOCKF_USED_IN_IRQ (LOCKF_USED_IN_HARDIRQ | LOCKF_USED_IN_SOFTIRQ) |
| 50 | |
| 51 | #define LOCKF_USED_IN_HARDIRQ_READ (1 << LOCK_USED_IN_HARDIRQ_READ) |
| 52 | #define LOCKF_USED_IN_SOFTIRQ_READ (1 << LOCK_USED_IN_SOFTIRQ_READ) |
| 53 | #define LOCKF_ENABLED_HARDIRQS_READ (1 << LOCK_ENABLED_HARDIRQS_READ) |
| 54 | #define LOCKF_ENABLED_SOFTIRQS_READ (1 << LOCK_ENABLED_SOFTIRQS_READ) |
| 55 | |
| 56 | #define LOCKF_ENABLED_IRQS_READ \ |
| 57 | (LOCKF_ENABLED_HARDIRQS_READ | LOCKF_ENABLED_SOFTIRQS_READ) |
| 58 | #define LOCKF_USED_IN_IRQ_READ \ |
| 59 | (LOCKF_USED_IN_HARDIRQ_READ | LOCKF_USED_IN_SOFTIRQ_READ) |
| 60 | |
| 61 | #define MAX_LOCKDEP_SUBCLASSES 8UL |
| 62 | |
| 63 | /* |
| 64 | * Lock-classes are keyed via unique addresses, by embedding the |
| 65 | * lockclass-key into the kernel (or module) .data section. (For |
| 66 | * static locks we use the lock address itself as the key.) |
| 67 | */ |
| 68 | struct lockdep_subclass_key { |
| 69 | char __one_byte; |
| 70 | } __attribute__ ((__packed__)); |
| 71 | |
| 72 | struct lock_class_key { |
| 73 | struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES]; |
| 74 | }; |
| 75 | |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 76 | #define LOCKSTAT_POINTS 4 |
| 77 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 78 | /* |
| 79 | * The lock-class itself: |
| 80 | */ |
| 81 | struct lock_class { |
| 82 | /* |
| 83 | * class-hash: |
| 84 | */ |
| 85 | struct list_head hash_entry; |
| 86 | |
| 87 | /* |
| 88 | * global list of all lock-classes: |
| 89 | */ |
| 90 | struct list_head lock_entry; |
| 91 | |
| 92 | struct lockdep_subclass_key *key; |
| 93 | unsigned int subclass; |
David Miller | 419ca3f | 2008-07-29 21:45:03 -0700 | [diff] [blame] | 94 | unsigned int dep_gen_id; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 95 | |
| 96 | /* |
| 97 | * IRQ/softirq usage tracking bits: |
| 98 | */ |
| 99 | unsigned long usage_mask; |
| 100 | struct stack_trace usage_traces[LOCK_USAGE_STATES]; |
| 101 | |
| 102 | /* |
| 103 | * These fields represent a directed graph of lock dependencies, |
| 104 | * to every node we attach a list of "forward" and a list of |
| 105 | * "backward" graph nodes. |
| 106 | */ |
| 107 | struct list_head locks_after, locks_before; |
| 108 | |
| 109 | /* |
| 110 | * Generation counter, when doing certain classes of graph walking, |
| 111 | * to ensure that we check one node only once: |
| 112 | */ |
| 113 | unsigned int version; |
| 114 | |
| 115 | /* |
| 116 | * Statistics counter: |
| 117 | */ |
| 118 | unsigned long ops; |
| 119 | |
| 120 | const char *name; |
| 121 | int name_version; |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 122 | |
| 123 | #ifdef CONFIG_LOCK_STAT |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 124 | unsigned long contention_point[LOCKSTAT_POINTS]; |
| 125 | unsigned long contending_point[LOCKSTAT_POINTS]; |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 126 | #endif |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 127 | }; |
| 128 | |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 129 | #ifdef CONFIG_LOCK_STAT |
| 130 | struct lock_time { |
| 131 | s64 min; |
| 132 | s64 max; |
| 133 | s64 total; |
| 134 | unsigned long nr; |
| 135 | }; |
| 136 | |
Peter Zijlstra | 9664567 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 137 | enum bounce_type { |
| 138 | bounce_acquired_write, |
| 139 | bounce_acquired_read, |
| 140 | bounce_contended_write, |
| 141 | bounce_contended_read, |
| 142 | nr_bounce_types, |
| 143 | |
| 144 | bounce_acquired = bounce_acquired_write, |
| 145 | bounce_contended = bounce_contended_write, |
| 146 | }; |
| 147 | |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 148 | struct lock_class_stats { |
| 149 | unsigned long contention_point[4]; |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 150 | unsigned long contending_point[4]; |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 151 | struct lock_time read_waittime; |
| 152 | struct lock_time write_waittime; |
| 153 | struct lock_time read_holdtime; |
| 154 | struct lock_time write_holdtime; |
Peter Zijlstra | 9664567 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 155 | unsigned long bounces[nr_bounce_types]; |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 156 | }; |
| 157 | |
| 158 | struct lock_class_stats lock_stats(struct lock_class *class); |
| 159 | void clear_lock_stats(struct lock_class *class); |
| 160 | #endif |
| 161 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 162 | /* |
| 163 | * Map the lock object (the lock instance) to the lock-class object. |
| 164 | * This is embedded into specific lock instances: |
| 165 | */ |
| 166 | struct lockdep_map { |
| 167 | struct lock_class_key *key; |
Ingo Molnar | d6d897c | 2006-07-10 04:44:04 -0700 | [diff] [blame] | 168 | struct lock_class *class_cache; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 169 | const char *name; |
Peter Zijlstra | 9664567 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 170 | #ifdef CONFIG_LOCK_STAT |
| 171 | int cpu; |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 172 | unsigned long ip; |
Peter Zijlstra | 9664567 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 173 | #endif |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 174 | }; |
| 175 | |
| 176 | /* |
| 177 | * Every lock has a list of other locks that were taken after it. |
| 178 | * We only grow the list, never remove from it: |
| 179 | */ |
| 180 | struct lock_list { |
| 181 | struct list_head entry; |
| 182 | struct lock_class *class; |
| 183 | struct stack_trace trace; |
Jason Baron | 068135e | 2007-02-10 01:44:59 -0800 | [diff] [blame] | 184 | int distance; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 185 | }; |
| 186 | |
| 187 | /* |
| 188 | * We record lock dependency chains, so that we can cache them: |
| 189 | */ |
| 190 | struct lock_chain { |
Huang, Ying | 443cd50 | 2008-06-20 16:39:21 +0800 | [diff] [blame] | 191 | u8 irq_context; |
| 192 | u8 depth; |
| 193 | u16 base; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 194 | struct list_head entry; |
| 195 | u64 chain_key; |
| 196 | }; |
| 197 | |
Ingo Molnar | e5f363e3 | 2008-08-11 12:37:27 +0200 | [diff] [blame] | 198 | #define MAX_LOCKDEP_KEYS_BITS 13 |
Peter Zijlstra | b42e737 | 2008-08-11 12:34:42 +0200 | [diff] [blame] | 199 | /* |
| 200 | * Subtract one because we offset hlock->class_idx by 1 in order |
| 201 | * to make 0 mean no class. This avoids overflowing the class_idx |
| 202 | * bitfield and hitting the BUG in hlock_class(). |
| 203 | */ |
| 204 | #define MAX_LOCKDEP_KEYS ((1UL << MAX_LOCKDEP_KEYS_BITS) - 1) |
Dave Jones | f82b217 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 205 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 206 | struct held_lock { |
| 207 | /* |
| 208 | * One-way hash of the dependency chain up to this point. We |
| 209 | * hash the hashes step by step as the dependency chain grows. |
| 210 | * |
| 211 | * We use it for dependency-caching and we skip detection |
| 212 | * passes and dependency-updates if there is a cache-hit, so |
| 213 | * it is absolutely critical for 100% coverage of the validator |
| 214 | * to have a unique key value for every unique dependency path |
| 215 | * that can occur in the system, to make a unique hash value |
| 216 | * as likely as possible - hence the 64-bit width. |
| 217 | * |
| 218 | * The task struct holds the current hash value (initialized |
| 219 | * with zero), here we store the previous hash value: |
| 220 | */ |
| 221 | u64 prev_chain_key; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 222 | unsigned long acquire_ip; |
| 223 | struct lockdep_map *instance; |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 224 | struct lockdep_map *nest_lock; |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 225 | #ifdef CONFIG_LOCK_STAT |
| 226 | u64 waittime_stamp; |
| 227 | u64 holdtime_stamp; |
| 228 | #endif |
Dave Jones | f82b217 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 229 | unsigned int class_idx:MAX_LOCKDEP_KEYS_BITS; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 230 | /* |
| 231 | * The lock-stack is unified in that the lock chains of interrupt |
| 232 | * contexts nest ontop of process context chains, but we 'separate' |
| 233 | * the hashes by starting with 0 if we cross into an interrupt |
| 234 | * context, and we also keep do not add cross-context lock |
| 235 | * dependencies - the lock usage graph walking covers that area |
| 236 | * anyway, and we'd just unnecessarily increase the number of |
| 237 | * dependencies otherwise. [Note: hardirq and softirq contexts |
| 238 | * are separated from each other too.] |
| 239 | * |
| 240 | * The following field is used to detect when we cross into an |
| 241 | * interrupt context: |
| 242 | */ |
Dave Jones | f82b217 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 243 | unsigned int irq_context:2; /* bit 0 - soft, bit 1 - hard */ |
| 244 | unsigned int trylock:1; |
| 245 | unsigned int read:2; /* see lock_acquire() comment */ |
| 246 | unsigned int check:2; /* see lock_acquire() comment */ |
| 247 | unsigned int hardirqs_off:1; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 248 | }; |
| 249 | |
| 250 | /* |
| 251 | * Initialization, self-test and debugging-output methods: |
| 252 | */ |
| 253 | extern void lockdep_init(void); |
| 254 | extern void lockdep_info(void); |
| 255 | extern void lockdep_reset(void); |
| 256 | extern void lockdep_reset_lock(struct lockdep_map *lock); |
| 257 | extern void lockdep_free_key_range(void *start, unsigned long size); |
Peter Zijlstra | b351d16 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 258 | extern void lockdep_sys_exit(void); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 259 | |
| 260 | extern void lockdep_off(void); |
| 261 | extern void lockdep_on(void); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 262 | |
| 263 | /* |
| 264 | * These methods are used by specific locking variants (spinlocks, |
| 265 | * rwlocks, mutexes and rwsems) to pass init/acquire/release events |
| 266 | * to lockdep: |
| 267 | */ |
| 268 | |
| 269 | extern void lockdep_init_map(struct lockdep_map *lock, const char *name, |
Peter Zijlstra | 4dfbb9d | 2006-10-11 01:45:14 -0400 | [diff] [blame] | 270 | struct lock_class_key *key, int subclass); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 271 | |
| 272 | /* |
Peter Zijlstra | 851a67b | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 273 | * To initialize a lockdep_map statically use this macro. |
| 274 | * Note that _name must not be NULL. |
| 275 | */ |
| 276 | #define STATIC_LOCKDEP_MAP_INIT(_name, _key) \ |
| 277 | { .name = (_name), .key = (void *)(_key), } |
| 278 | |
| 279 | /* |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 280 | * Reinitialize a lock key - for cases where there is special locking or |
| 281 | * special initialization of locks so that the validator gets the scope |
| 282 | * of dependencies wrong: they are either too broad (they need a class-split) |
| 283 | * or they are too narrow (they suffer from a false class-split): |
| 284 | */ |
| 285 | #define lockdep_set_class(lock, key) \ |
Peter Zijlstra | 4dfbb9d | 2006-10-11 01:45:14 -0400 | [diff] [blame] | 286 | lockdep_init_map(&(lock)->dep_map, #key, key, 0) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 287 | #define lockdep_set_class_and_name(lock, key, name) \ |
Peter Zijlstra | 4dfbb9d | 2006-10-11 01:45:14 -0400 | [diff] [blame] | 288 | lockdep_init_map(&(lock)->dep_map, name, key, 0) |
| 289 | #define lockdep_set_class_and_subclass(lock, key, sub) \ |
| 290 | lockdep_init_map(&(lock)->dep_map, #key, key, sub) |
| 291 | #define lockdep_set_subclass(lock, sub) \ |
| 292 | lockdep_init_map(&(lock)->dep_map, #lock, \ |
| 293 | (lock)->dep_map.key, sub) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 294 | |
| 295 | /* |
| 296 | * Acquire a lock. |
| 297 | * |
| 298 | * Values for "read": |
| 299 | * |
| 300 | * 0: exclusive (write) acquire |
| 301 | * 1: read-acquire (no recursion allowed) |
| 302 | * 2: read-acquire with same-instance recursion allowed |
| 303 | * |
| 304 | * Values for check: |
| 305 | * |
| 306 | * 0: disabled |
| 307 | * 1: simple checks (freeing, held-at-exit-time, etc.) |
| 308 | * 2: full validation |
| 309 | */ |
| 310 | extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass, |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 311 | int trylock, int read, int check, |
| 312 | struct lockdep_map *nest_lock, unsigned long ip); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 313 | |
| 314 | extern void lock_release(struct lockdep_map *lock, int nested, |
| 315 | unsigned long ip); |
| 316 | |
Peter Zijlstra | 64aa348 | 2008-08-11 09:30:21 +0200 | [diff] [blame] | 317 | extern void lock_set_subclass(struct lockdep_map *lock, unsigned int subclass, |
| 318 | unsigned long ip); |
| 319 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 320 | # define INIT_LOCKDEP .lockdep_recursion = 0, |
| 321 | |
Jarek Poplawski | e3a55fd | 2007-03-22 00:11:26 -0800 | [diff] [blame] | 322 | #define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0) |
Peter Zijlstra | d5abe66 | 2006-12-06 20:37:26 -0800 | [diff] [blame] | 323 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 324 | #else /* !LOCKDEP */ |
| 325 | |
| 326 | static inline void lockdep_off(void) |
| 327 | { |
| 328 | } |
| 329 | |
| 330 | static inline void lockdep_on(void) |
| 331 | { |
| 332 | } |
| 333 | |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 334 | # define lock_acquire(l, s, t, r, c, n, i) do { } while (0) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 335 | # define lock_release(l, n, i) do { } while (0) |
Peter Zijlstra | 64aa348 | 2008-08-11 09:30:21 +0200 | [diff] [blame] | 336 | # define lock_set_subclass(l, s, i) do { } while (0) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 337 | # define lockdep_init() do { } while (0) |
| 338 | # define lockdep_info() do { } while (0) |
Ingo Molnar | e25cf3d | 2008-10-17 15:55:07 +0200 | [diff] [blame] | 339 | # define lockdep_init_map(lock, name, key, sub) \ |
| 340 | do { (void)(name); (void)(key); } while (0) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 341 | # define lockdep_set_class(lock, key) do { (void)(key); } while (0) |
| 342 | # define lockdep_set_class_and_name(lock, key, name) \ |
Ingo Molnar | e25cf3d | 2008-10-17 15:55:07 +0200 | [diff] [blame] | 343 | do { (void)(key); (void)(name); } while (0) |
Peter Zijlstra | 4dfbb9d | 2006-10-11 01:45:14 -0400 | [diff] [blame] | 344 | #define lockdep_set_class_and_subclass(lock, key, sub) \ |
| 345 | do { (void)(key); } while (0) |
Andrew Morton | 07646e2 | 2006-10-11 23:45:23 -0400 | [diff] [blame] | 346 | #define lockdep_set_subclass(lock, sub) do { } while (0) |
| 347 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 348 | # define INIT_LOCKDEP |
| 349 | # define lockdep_reset() do { debug_locks = 1; } while (0) |
| 350 | # define lockdep_free_key_range(start, size) do { } while (0) |
Peter Zijlstra | b351d16 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 351 | # define lockdep_sys_exit() do { } while (0) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 352 | /* |
| 353 | * The class key takes no space if lockdep is disabled: |
| 354 | */ |
| 355 | struct lock_class_key { }; |
Peter Zijlstra | d5abe66 | 2006-12-06 20:37:26 -0800 | [diff] [blame] | 356 | |
| 357 | #define lockdep_depth(tsk) (0) |
| 358 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 359 | #endif /* !LOCKDEP */ |
| 360 | |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 361 | #ifdef CONFIG_LOCK_STAT |
| 362 | |
| 363 | extern void lock_contended(struct lockdep_map *lock, unsigned long ip); |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 364 | extern void lock_acquired(struct lockdep_map *lock, unsigned long ip); |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 365 | |
| 366 | #define LOCK_CONTENDED(_lock, try, lock) \ |
| 367 | do { \ |
| 368 | if (!try(_lock)) { \ |
| 369 | lock_contended(&(_lock)->dep_map, _RET_IP_); \ |
| 370 | lock(_lock); \ |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 371 | } \ |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 372 | lock_acquired(&(_lock)->dep_map, _RET_IP_); \ |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 373 | } while (0) |
| 374 | |
| 375 | #else /* CONFIG_LOCK_STAT */ |
| 376 | |
| 377 | #define lock_contended(lockdep_map, ip) do {} while (0) |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 378 | #define lock_acquired(lockdep_map, ip) do {} while (0) |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 379 | |
| 380 | #define LOCK_CONTENDED(_lock, try, lock) \ |
| 381 | lock(_lock) |
| 382 | |
| 383 | #endif /* CONFIG_LOCK_STAT */ |
| 384 | |
Ingo Molnar | 243c762 | 2006-07-03 00:25:06 -0700 | [diff] [blame] | 385 | #if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_GENERIC_HARDIRQS) |
| 386 | extern void early_init_irq_lock_class(void); |
| 387 | #else |
Ingo Molnar | 3117df0 | 2006-12-13 00:34:43 -0800 | [diff] [blame] | 388 | static inline void early_init_irq_lock_class(void) |
| 389 | { |
| 390 | } |
Ingo Molnar | 243c762 | 2006-07-03 00:25:06 -0700 | [diff] [blame] | 391 | #endif |
| 392 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 393 | #ifdef CONFIG_TRACE_IRQFLAGS |
| 394 | extern void early_boot_irqs_off(void); |
| 395 | extern void early_boot_irqs_on(void); |
Ingo Molnar | 3117df0 | 2006-12-13 00:34:43 -0800 | [diff] [blame] | 396 | extern void print_irqtrace_events(struct task_struct *curr); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 397 | #else |
Ingo Molnar | 3117df0 | 2006-12-13 00:34:43 -0800 | [diff] [blame] | 398 | static inline void early_boot_irqs_off(void) |
| 399 | { |
| 400 | } |
| 401 | static inline void early_boot_irqs_on(void) |
| 402 | { |
| 403 | } |
| 404 | static inline void print_irqtrace_events(struct task_struct *curr) |
| 405 | { |
| 406 | } |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 407 | #endif |
| 408 | |
| 409 | /* |
| 410 | * For trivial one-depth nesting of a lock-class, the following |
| 411 | * global define can be used. (Subsystems with multiple levels |
| 412 | * of nesting should define their own lock-nesting subclasses.) |
| 413 | */ |
| 414 | #define SINGLE_DEPTH_NESTING 1 |
| 415 | |
| 416 | /* |
| 417 | * Map the dependency ops to NOP or to real lockdep ops, depending |
| 418 | * on the per lock-class debug mode: |
| 419 | */ |
| 420 | |
| 421 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 422 | # ifdef CONFIG_PROVE_LOCKING |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 423 | # define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
Peter Zijlstra | b7d39af | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 424 | # define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 2, n, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 425 | # else |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 426 | # define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
Peter Zijlstra | b7d39af | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 427 | # define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 428 | # endif |
| 429 | # define spin_release(l, n, i) lock_release(l, n, i) |
| 430 | #else |
| 431 | # define spin_acquire(l, s, t, i) do { } while (0) |
| 432 | # define spin_release(l, n, i) do { } while (0) |
| 433 | #endif |
| 434 | |
| 435 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 436 | # ifdef CONFIG_PROVE_LOCKING |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 437 | # define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
| 438 | # define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 2, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 439 | # else |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 440 | # define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
| 441 | # define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 1, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 442 | # endif |
| 443 | # define rwlock_release(l, n, i) lock_release(l, n, i) |
| 444 | #else |
| 445 | # define rwlock_acquire(l, s, t, i) do { } while (0) |
| 446 | # define rwlock_acquire_read(l, s, t, i) do { } while (0) |
| 447 | # define rwlock_release(l, n, i) do { } while (0) |
| 448 | #endif |
| 449 | |
| 450 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 451 | # ifdef CONFIG_PROVE_LOCKING |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 452 | # define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 453 | # else |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 454 | # define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 455 | # endif |
| 456 | # define mutex_release(l, n, i) lock_release(l, n, i) |
| 457 | #else |
| 458 | # define mutex_acquire(l, s, t, i) do { } while (0) |
| 459 | # define mutex_release(l, n, i) do { } while (0) |
| 460 | #endif |
| 461 | |
| 462 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 463 | # ifdef CONFIG_PROVE_LOCKING |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 464 | # define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
| 465 | # define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 2, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 466 | # else |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 467 | # define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
| 468 | # define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 1, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 469 | # endif |
| 470 | # define rwsem_release(l, n, i) lock_release(l, n, i) |
| 471 | #else |
| 472 | # define rwsem_acquire(l, s, t, i) do { } while (0) |
| 473 | # define rwsem_acquire_read(l, s, t, i) do { } while (0) |
| 474 | # define rwsem_release(l, n, i) do { } while (0) |
| 475 | #endif |
| 476 | |
Peter Zijlstra | 4f3e752 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 477 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 478 | # ifdef CONFIG_PROVE_LOCKING |
Ingo Molnar | 3295f0e | 2008-08-11 10:30:30 +0200 | [diff] [blame] | 479 | # define lock_map_acquire(l) lock_acquire(l, 0, 0, 0, 2, NULL, _THIS_IP_) |
Peter Zijlstra | 4f3e752 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 480 | # else |
Ingo Molnar | 3295f0e | 2008-08-11 10:30:30 +0200 | [diff] [blame] | 481 | # define lock_map_acquire(l) lock_acquire(l, 0, 0, 0, 1, NULL, _THIS_IP_) |
Peter Zijlstra | 4f3e752 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 482 | # endif |
Ingo Molnar | 3295f0e | 2008-08-11 10:30:30 +0200 | [diff] [blame] | 483 | # define lock_map_release(l) lock_release(l, 1, _THIS_IP_) |
Peter Zijlstra | 4f3e752 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 484 | #else |
Ingo Molnar | 3295f0e | 2008-08-11 10:30:30 +0200 | [diff] [blame] | 485 | # define lock_map_acquire(l) do { } while (0) |
| 486 | # define lock_map_release(l) do { } while (0) |
Peter Zijlstra | 4f3e752 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 487 | #endif |
| 488 | |
Peter Zijlstra | 76b189e | 2008-09-10 09:57:35 +0200 | [diff] [blame] | 489 | #ifdef CONFIG_PROVE_LOCKING |
| 490 | # define might_lock(lock) \ |
| 491 | do { \ |
| 492 | typecheck(struct lockdep_map *, &(lock)->dep_map); \ |
| 493 | lock_acquire(&(lock)->dep_map, 0, 0, 0, 2, NULL, _THIS_IP_); \ |
| 494 | lock_release(&(lock)->dep_map, 0, _THIS_IP_); \ |
| 495 | } while (0) |
| 496 | # define might_lock_read(lock) \ |
| 497 | do { \ |
| 498 | typecheck(struct lockdep_map *, &(lock)->dep_map); \ |
| 499 | lock_acquire(&(lock)->dep_map, 0, 0, 1, 2, NULL, _THIS_IP_); \ |
| 500 | lock_release(&(lock)->dep_map, 0, _THIS_IP_); \ |
| 501 | } while (0) |
| 502 | #else |
| 503 | # define might_lock(lock) do { } while (0) |
| 504 | # define might_lock_read(lock) do { } while (0) |
| 505 | #endif |
| 506 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 507 | #endif /* __LINUX_LOCKDEP_H */ |