l4/pkg/dde/linux26/include/linux/spinlock.h

   1 #ifndef __LINUX_SPINLOCK_H
   2 #define __LINUX_SPINLOCK_H
   3
   4 /*
   5  * include/linux/spinlock.h - generic spinlock/rwlock declarations
   6  *
   7  * here's the role of the various spinlock/rwlock related include files:
   8  *
   9  * on SMP builds:
  10  *
  11  *  asm/spinlock_types.h: contains the raw_spinlock_t/raw_rwlock_t and the
  12  *                        initializers
  13  *
  14  *  linux/spinlock_types.h:
  15  *                        defines the generic type and initializers
  16  *
  17  *  asm/spinlock.h:       contains the __raw_spin_*()/etc. lowlevel
  18  *                        implementations, mostly inline assembly code
  19  *
  20  *   (also included on UP-debug builds:)
  21  *
  22  *  linux/spinlock_api_smp.h:
  23  *                        contains the prototypes for the _spin_*() APIs.
  24  *
  25  *  linux/spinlock.h:     builds the final spin_*() APIs.
  26  *
  27  * on UP builds:
  28  *
  29  *  linux/spinlock_type_up.h:
  30  *                        contains the generic, simplified UP spinlock type.
  31  *                        (which is an empty structure on non-debug builds)
  32  *
  33  *  linux/spinlock_types.h:
  34  *                        defines the generic type and initializers
  35  *
  36  *  linux/spinlock_up.h:
  37  *                        contains the __raw_spin_*()/etc. version of UP
  38  *                        builds. (which are NOPs on non-debug, non-preempt
  39  *                        builds)
  40  *
  41  *   (included on UP-non-debug builds:)
  42  *
  43  *  linux/spinlock_api_up.h:
  44  *                        builds the _spin_*() APIs.
  45  *
  46  *  linux/spinlock.h:     builds the final spin_*() APIs.
  47  */
  48
  49 #include <linux/typecheck.h>
  50 #include <linux/preempt.h>
  51 #include <linux/linkage.h>
  52 #include <linux/compiler.h>
  53 #include <linux/thread_info.h>
  54 #include <linux/kernel.h>
  55 #include <linux/stringify.h>
  56 #include <linux/bottom_half.h>
  57
  58 #include <asm/system.h>
  59
  60 /*
  61  * Must define these before including other files, inline functions need them
  62  */
  63 #define LOCK_SECTION_NAME ".text.lock."KBUILD_BASENAME
  64
  65 #define LOCK_SECTION_START(extra)               \
  66         ".subsection 1\n\t"                     \
  67         extra                                   \
  68         ".ifndef " LOCK_SECTION_NAME "\n\t"     \
  69         LOCK_SECTION_NAME ":\n\t"               \
  70         ".endif\n"
  71
  72 #define LOCK_SECTION_END                        \
  73         ".previous\n\t"
  74
  75 #define __lockfunc __attribute__((section(".spinlock.text")))
  76
  77 /*
  78  * Pull the raw_spinlock_t and raw_rwlock_t definitions:
  79  */
  80 #include <linux/spinlock_types.h>
  81
  82 #ifndef DDE_LINUX
  83 extern int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock);
  84
  85 /*
  86  * Pull the __raw*() functions/declarations (UP-nondebug doesnt need them):
  87  */
  88 #ifdef CONFIG_SMP
  89 # include <asm/spinlock.h>
  90 #else
  91 # include <linux/spinlock_up.h>
  92 #endif
  93
  94 #ifdef CONFIG_DEBUG_SPINLOCK
  95   extern void __spin_lock_init(spinlock_t *lock, const char *name,
  96                                struct lock_class_key *key);
  97 # define spin_lock_init(lock)                                   \
  98 do {                                                            \
  99         static struct lock_class_key __key;                     \
 100                                                                 \
 101         __spin_lock_init((lock), #lock, &__key);                \
 102 } while (0)
 103
 104 #else
 105 # define spin_lock_init(lock)                                   \
 106         do { *(lock) = SPIN_LOCK_UNLOCKED; } while (0)
 107 #endif
 108
 109 #ifdef CONFIG_DEBUG_SPINLOCK
 110   extern void __rwlock_init(rwlock_t *lock, const char *name,
 111                             struct lock_class_key *key);
 112 # define rwlock_init(lock)                                      \
 113 do {                                                            \
 114         static struct lock_class_key __key;                     \
 115                                                                 \
 116         __rwlock_init((lock), #lock, &__key);                   \
 117 } while (0)
 118 #else
 119 # define rwlock_init(lock)                                      \
 120         do { *(lock) = RW_LOCK_UNLOCKED; } while (0)
 121 #endif
 122
 123 #define spin_is_locked(lock)    __raw_spin_is_locked(&(lock)->raw_lock)
 124
 125 #ifdef CONFIG_GENERIC_LOCKBREAK
 126 #define spin_is_contended(lock) ((lock)->break_lock)
 127 #else
 128
 129 #ifdef __raw_spin_is_contended
 130 #define spin_is_contended(lock) __raw_spin_is_contended(&(lock)->raw_lock)
 131 #else
 132 #define spin_is_contended(lock) (((void)(lock), 0))
 133 #endif /*__raw_spin_is_contended*/
 134 #endif
 135
 136 /**
 137  * spin_unlock_wait - wait until the spinlock gets unlocked
 138  * @lock: the spinlock in question.
 139  */
 140 #define spin_unlock_wait(lock)  __raw_spin_unlock_wait(&(lock)->raw_lock)
 141
 142 /*
 143  * Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
 144  */
 145 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
 146 # include <linux/spinlock_api_smp.h>
 147 #else
 148 # include <linux/spinlock_api_up.h>
 149 #endif
 150
 151 #ifdef CONFIG_DEBUG_SPINLOCK
 152  extern void _raw_spin_lock(spinlock_t *lock);
 153 #define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
 154  extern int _raw_spin_trylock(spinlock_t *lock);
 155  extern void _raw_spin_unlock(spinlock_t *lock);
 156  extern void _raw_read_lock(rwlock_t *lock);
 157  extern int _raw_read_trylock(rwlock_t *lock);
 158  extern void _raw_read_unlock(rwlock_t *lock);
 159  extern void _raw_write_lock(rwlock_t *lock);
 160  extern int _raw_write_trylock(rwlock_t *lock);
 161  extern void _raw_write_unlock(rwlock_t *lock);
 162 #else
 163 # define _raw_spin_lock(lock)           __raw_spin_lock(&(lock)->raw_lock)
 164 # define _raw_spin_lock_flags(lock, flags) \
 165                 __raw_spin_lock_flags(&(lock)->raw_lock, *(flags))
 166 # define _raw_spin_trylock(lock)        __raw_spin_trylock(&(lock)->raw_lock)
 167 # define _raw_spin_unlock(lock)         __raw_spin_unlock(&(lock)->raw_lock)
 168 # define _raw_read_lock(rwlock)         __raw_read_lock(&(rwlock)->raw_lock)
 169 # define _raw_read_trylock(rwlock)      __raw_read_trylock(&(rwlock)->raw_lock)
 170 # define _raw_read_unlock(rwlock)       __raw_read_unlock(&(rwlock)->raw_lock)
 171 # define _raw_write_lock(rwlock)        __raw_write_lock(&(rwlock)->raw_lock)
 172 # define _raw_write_trylock(rwlock)     __raw_write_trylock(&(rwlock)->raw_lock)
 173 # define _raw_write_unlock(rwlock)      __raw_write_unlock(&(rwlock)->raw_lock)
 174 #endif
 175
 176 #define read_can_lock(rwlock)           __raw_read_can_lock(&(rwlock)->raw_lock)
 177 #define write_can_lock(rwlock)          __raw_write_can_lock(&(rwlock)->raw_lock)
 178
 179 /*
 180  * Define the various spin_lock and rw_lock methods.  Note we define these
 181  * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
 182  * methods are defined as nops in the case they are not required.
 183  */
 184 #define spin_trylock(lock)              __cond_lock(lock, _spin_trylock(lock))
 185 #define read_trylock(lock)              __cond_lock(lock, _read_trylock(lock))
 186 #define write_trylock(lock)             __cond_lock(lock, _write_trylock(lock))
 187
 188 #define spin_lock(lock)                 _spin_lock(lock)
 189
 190 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 191 # define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass)
 192 # define spin_lock_nest_lock(lock, nest_lock)                           \
 193          do {                                                           \
 194                  typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\
 195                  _spin_lock_nest_lock(lock, &(nest_lock)->dep_map);     \
 196          } while (0)
 197 #else
 198 # define spin_lock_nested(lock, subclass) _spin_lock(lock)
 199 # define spin_lock_nest_lock(lock, nest_lock) _spin_lock(lock)
 200 #endif
 201
 202 #define write_lock(lock)                _write_lock(lock)
 203 #define read_lock(lock)                 _read_lock(lock)
 204
 205 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
 206
 207 #define spin_lock_irqsave(lock, flags)                  \
 208         do {                                            \
 209                 typecheck(unsigned long, flags);        \
 210                 flags = _spin_lock_irqsave(lock);       \
 211         } while (0)
 212 #define read_lock_irqsave(lock, flags)                  \
 213         do {                                            \
 214                 typecheck(unsigned long, flags);        \
 215                 flags = _read_lock_irqsave(lock);       \
 216         } while (0)
 217 #define write_lock_irqsave(lock, flags)                 \
 218         do {                                            \
 219                 typecheck(unsigned long, flags);        \
 220                 flags = _write_lock_irqsave(lock);      \
 221         } while (0)
 222
 223 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 224 #define spin_lock_irqsave_nested(lock, flags, subclass)                 \
 225         do {                                                            \
 226                 typecheck(unsigned long, flags);                        \
 227                 flags = _spin_lock_irqsave_nested(lock, subclass);      \
 228         } while (0)
 229 #else
 230 #define spin_lock_irqsave_nested(lock, flags, subclass)                 \
 231         do {                                                            \
 232                 typecheck(unsigned long, flags);                        \
 233                 flags = _spin_lock_irqsave(lock);                       \
 234         } while (0)
 235 #endif
 236
 237 #else
 238
 239 #define spin_lock_irqsave(lock, flags)                  \
 240         do {                                            \
 241                 typecheck(unsigned long, flags);        \
 242                 _spin_lock_irqsave(lock, flags);        \
 243         } while (0)
 244 #define read_lock_irqsave(lock, flags)                  \
 245         do {                                            \
 246                 typecheck(unsigned long, flags);        \
 247                 _read_lock_irqsave(lock, flags);        \
 248         } while (0)
 249 #define write_lock_irqsave(lock, flags)                 \
 250         do {                                            \
 251                 typecheck(unsigned long, flags);        \
 252                 _write_lock_irqsave(lock, flags);       \
 253         } while (0)
 254 #define spin_lock_irqsave_nested(lock, flags, subclass) \
 255         spin_lock_irqsave(lock, flags)
 256
 257 #endif
 258
 259 #define spin_lock_irq(lock)             _spin_lock_irq(lock)
 260 #define spin_lock_bh(lock)              _spin_lock_bh(lock)
 261
 262 #define read_lock_irq(lock)             _read_lock_irq(lock)
 263 #define read_lock_bh(lock)              _read_lock_bh(lock)
 264
 265 #define write_lock_irq(lock)            _write_lock_irq(lock)
 266 #define write_lock_bh(lock)             _write_lock_bh(lock)
 267
 268 /*
 269  * We inline the unlock functions in the nondebug case:
 270  */
 271 #if defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) || \
 272         !defined(CONFIG_SMP)
 273 # define spin_unlock(lock)              _spin_unlock(lock)
 274 # define read_unlock(lock)              _read_unlock(lock)
 275 # define write_unlock(lock)             _write_unlock(lock)
 276 # define spin_unlock_irq(lock)          _spin_unlock_irq(lock)
 277 # define read_unlock_irq(lock)          _read_unlock_irq(lock)
 278 # define write_unlock_irq(lock)         _write_unlock_irq(lock)
 279 #else
 280 # define spin_unlock(lock) \
 281     do {__raw_spin_unlock(&(lock)->raw_lock); __release(lock); } while (0)
 282 # define read_unlock(lock) \
 283     do {__raw_read_unlock(&(lock)->raw_lock); __release(lock); } while (0)
 284 # define write_unlock(lock) \
 285     do {__raw_write_unlock(&(lock)->raw_lock); __release(lock); } while (0)
 286 # define spin_unlock_irq(lock)                  \
 287 do {                                            \
 288         __raw_spin_unlock(&(lock)->raw_lock);   \
 289         __release(lock);                        \
 290         local_irq_enable();                     \
 291 } while (0)
 292 # define read_unlock_irq(lock)                  \
 293 do {                                            \
 294         __raw_read_unlock(&(lock)->raw_lock);   \
 295         __release(lock);                        \
 296         local_irq_enable();                     \
 297 } while (0)
 298 # define write_unlock_irq(lock)                 \
 299 do {                                            \
 300         __raw_write_unlock(&(lock)->raw_lock);  \
 301         __release(lock);                        \
 302         local_irq_enable();                     \
 303 } while (0)
 304 #endif
 305
 306 #define spin_unlock_irqrestore(lock, flags)             \
 307         do {                                            \
 308                 typecheck(unsigned long, flags);        \
 309                 _spin_unlock_irqrestore(lock, flags);   \
 310         } while (0)
 311 #define spin_unlock_bh(lock)            _spin_unlock_bh(lock)
 312
 313 #define read_unlock_irqrestore(lock, flags)             \
 314         do {                                            \
 315                 typecheck(unsigned long, flags);        \
 316                 _read_unlock_irqrestore(lock, flags);   \
 317         } while (0)
 318 #define read_unlock_bh(lock)            _read_unlock_bh(lock)
 319
 320 #define write_unlock_irqrestore(lock, flags)            \
 321         do {                                            \
 322                 typecheck(unsigned long, flags);        \
 323                 _write_unlock_irqrestore(lock, flags);  \
 324         } while (0)
 325 #define write_unlock_bh(lock)           _write_unlock_bh(lock)
 326
 327 #define spin_trylock_bh(lock)   __cond_lock(lock, _spin_trylock_bh(lock))
 328
 329 #define spin_trylock_irq(lock) \
 330 ({ \
 331         local_irq_disable(); \
 332         spin_trylock(lock) ? \
 333         1 : ({ local_irq_enable(); 0;  }); \
 334 })
 335
 336 #define spin_trylock_irqsave(lock, flags) \
 337 ({ \
 338         local_irq_save(flags); \
 339         spin_trylock(lock) ? \
 340         1 : ({ local_irq_restore(flags); 0; }); \
 341 })
 342
 343 #define write_trylock_irqsave(lock, flags) \
 344 ({ \
 345         local_irq_save(flags); \
 346         write_trylock(lock) ? \
 347         1 : ({ local_irq_restore(flags); 0; }); \
 348 })
 349
 350 /*
 351  * Pull the atomic_t declaration:
 352  * (asm-mips/atomic.h needs above definitions)
 353  */
 354 #include <asm/atomic.h>
 355 /**
 356  * atomic_dec_and_lock - lock on reaching reference count zero
 357  * @atomic: the atomic counter
 358  * @lock: the spinlock in question
 359  *
 360  * Decrements @atomic by 1.  If the result is 0, returns true and locks
 361  * @lock.  Returns false for all other cases.
 362  */
 363 extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock);
 364 #define atomic_dec_and_lock(atomic, lock) \
 365                 __cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
 366
 367 /**
 368  * spin_can_lock - would spin_trylock() succeed?
 369  * @lock: the spinlock in question.
 370  */
 371 #define spin_can_lock(lock)     (!spin_is_locked(lock))
 372
 373 #else /* DDE_LINUX */
 374
 375 #define spin_lock_init(l) \
 376         do { \
 377                 ddekit_lock_init(&(l)->ddekit_lock); \
 378                 (l)->need_init = 0; \
 379         } while (0);
 380
 381 #define rwlock_init(l) spin_lock_init(l)
 382
 383 #define COND_INIT_LOCK(l) \
 384         do { \
 385                 if ((l)->need_init) spin_lock_init(l); \
 386         } while (0);
 387
 388 #define spin_lock(lock) \
 389         do { \
 390                 COND_INIT_LOCK(lock); \
 391                 preempt_disable(); \
 392                 ddekit_lock_lock(&(lock)->ddekit_lock); \
 393         } while (0)
 394
 395 #define read_lock(lock) spin_lock(lock)
 396 #define write_lock(lock) spin_lock(lock)
 397 #define spin_lock_irq(lock) local_irq_disable(); spin_lock(lock)
 398 #define spin_lock_bh(lock) spin_lock(lock)
 399 #define read_lock_irq(lock) spin_lock_irq(lock)
 400 #define read_lock_bh(lock) spin_lock_bh(lock)
 401 #define write_lock_irq(lock) spin_lock_irq(lock)
 402 #define write_lock_bh(lock) spin_lock_bh(lock)
 403
 404 #define spin_unlock(lock) \
 405         do { \
 406                 COND_INIT_LOCK(lock); \
 407                 ddekit_lock_unlock(&(lock)->ddekit_lock); \
 408                 preempt_enable(); \
 409         } while (0)
 410
 411 #define read_unlock(lock) spin_unlock(lock)
 412 #define write_unlock(lock) spin_unlock(lock)
 413
 414 #define spin_unlock_irq(lock) spin_unlock(lock); local_irq_enable()
 415 #define spin_unlock_bh(lock) spin_unlock(lock)
 416 #define read_unlock_irq(lock) spin_unlock_irq(lock)
 417 #define read_unlock_bh(lock) spin_unlock_bh(lock)
 418 #define write_unlock_irq(lock) spin_unlock_irq(lock)
 419 #define write_unlock_bh(lock) spin_unlock_bh(lock)
 420
 421 #define spin_lock_irqsave(lock, flags) \
 422         do { \
 423                 local_irq_save(flags); \
 424                 spin_lock(lock);\
 425         } while (0);
 426
 427 #define read_lock_irqsave(lock, flags)  spin_lock_irqsave(lock, flags)
 428 #define write_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
 429
 430 #define spin_unlock_irqrestore(lock, flags) \
 431         do { \
 432                 spin_unlock(lock); \
 433                 local_irq_restore(flags); \
 434         } while (0);
 435
 436 #define read_unlock_irqrestore(lock, flags) spin_unlock_irqrestore(lock, flags)
 437 #define write_unlock_irqrestore(lock, flags) spin_unlock_irqrestore(lock, flags)
 438
 439 static int __lockfunc spin_trylock(spinlock_t *lock)
 440 {
 441         COND_INIT_LOCK(lock);
 442         return ddekit_lock_try_lock(&lock->ddekit_lock) == 0;
 443 }
 444
 445 #define _raw_spin_lock(l) spin_lock(l)
 446 #define _raw_spin_unlock(l) spin_unlock(l)
 447 #define _raw_spin_trylock(l) spin_trylock(l)
 448
 449 #define spin_trylock_irqsave(lock, flags) \
 450 ({ \
 451         local_irq_save(flags); \
 452         spin_trylock(lock) ? \
 453         1 : ({ local_irq_restore(flags); 0; }); \
 454 })
 455
 456 #define read_trylock(l) spin_trylock(l)
 457 #define write_trylock(l) read_trylock(l)
 458
 459 #define spin_is_locked(x) \
 460                 (ddekit_lock_owner(&(x)->ddekit_lock) != 0)
 461
 462 #define assert_spin_locked(x)   BUG_ON(!spin_is_locked(x))
 463
 464
 465 #endif /* DDE_LINUX */
 466
 467 #endif /* __LINUX_SPINLOCK_H */