diff options
Diffstat (limited to 'libdde-linux26/include/linux/spinlock.h')
| -rw-r--r-- | libdde-linux26/include/linux/spinlock.h | 467 |
1 files changed, 467 insertions, 0 deletions
diff --git a/libdde-linux26/include/linux/spinlock.h b/libdde-linux26/include/linux/spinlock.h new file mode 100644 index 00000000..ab862f99 --- /dev/null +++ b/libdde-linux26/include/linux/spinlock.h @@ -0,0 +1,467 @@ +#ifndef __LINUX_SPINLOCK_H +#define __LINUX_SPINLOCK_H + +/* + * include/linux/spinlock.h - generic spinlock/rwlock declarations + * + * here's the role of the various spinlock/rwlock related include files: + * + * on SMP builds: + * + * asm/spinlock_types.h: contains the raw_spinlock_t/raw_rwlock_t and the + * initializers + * + * linux/spinlock_types.h: + * defines the generic type and initializers + * + * asm/spinlock.h: contains the __raw_spin_*()/etc. lowlevel + * implementations, mostly inline assembly code + * + * (also included on UP-debug builds:) + * + * linux/spinlock_api_smp.h: + * contains the prototypes for the _spin_*() APIs. + * + * linux/spinlock.h: builds the final spin_*() APIs. + * + * on UP builds: + * + * linux/spinlock_type_up.h: + * contains the generic, simplified UP spinlock type. + * (which is an empty structure on non-debug builds) + * + * linux/spinlock_types.h: + * defines the generic type and initializers + * + * linux/spinlock_up.h: + * contains the __raw_spin_*()/etc. version of UP + * builds. (which are NOPs on non-debug, non-preempt + * builds) + * + * (included on UP-non-debug builds:) + * + * linux/spinlock_api_up.h: + * builds the _spin_*() APIs. + * + * linux/spinlock.h: builds the final spin_*() APIs. + */ + +#include <linux/typecheck.h> +#include <linux/preempt.h> +#include <linux/linkage.h> +#include <linux/compiler.h> +#include <linux/thread_info.h> +#include <linux/kernel.h> +#include <linux/stringify.h> +#include <linux/bottom_half.h> + +#include <asm/system.h> + +/* + * Must define these before including other files, inline functions need them + */ +#define LOCK_SECTION_NAME ".text.lock."KBUILD_BASENAME + +#define LOCK_SECTION_START(extra) \ + ".subsection 1\n\t" \ + extra \ + ".ifndef " LOCK_SECTION_NAME "\n\t" \ + LOCK_SECTION_NAME ":\n\t" \ + ".endif\n" + +#define LOCK_SECTION_END \ + ".previous\n\t" + +#define __lockfunc __attribute__((section(".spinlock.text"))) + +/* + * Pull the raw_spinlock_t and raw_rwlock_t definitions: + */ +#include <linux/spinlock_types.h> + +#ifndef DDE_LINUX +extern int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock); + +/* + * Pull the __raw*() functions/declarations (UP-nondebug doesnt need them): + */ +#ifdef CONFIG_SMP +# include <asm/spinlock.h> +#else +# include <linux/spinlock_up.h> +#endif + +#ifdef CONFIG_DEBUG_SPINLOCK + extern void __spin_lock_init(spinlock_t *lock, const char *name, + struct lock_class_key *key); +# define spin_lock_init(lock) \ +do { \ + static struct lock_class_key __key; \ + \ + __spin_lock_init((lock), #lock, &__key); \ +} while (0) + +#else +# define spin_lock_init(lock) \ + do { *(lock) = SPIN_LOCK_UNLOCKED; } while (0) +#endif + +#ifdef CONFIG_DEBUG_SPINLOCK + extern void __rwlock_init(rwlock_t *lock, const char *name, + struct lock_class_key *key); +# define rwlock_init(lock) \ +do { \ + static struct lock_class_key __key; \ + \ + __rwlock_init((lock), #lock, &__key); \ +} while (0) +#else +# define rwlock_init(lock) \ + do { *(lock) = RW_LOCK_UNLOCKED; } while (0) +#endif + +#define spin_is_locked(lock) __raw_spin_is_locked(&(lock)->raw_lock) + +#ifdef CONFIG_GENERIC_LOCKBREAK +#define spin_is_contended(lock) ((lock)->break_lock) +#else + +#ifdef __raw_spin_is_contended +#define spin_is_contended(lock) __raw_spin_is_contended(&(lock)->raw_lock) +#else +#define spin_is_contended(lock) (((void)(lock), 0)) +#endif /*__raw_spin_is_contended*/ +#endif + +/** + * spin_unlock_wait - wait until the spinlock gets unlocked + * @lock: the spinlock in question. + */ +#define spin_unlock_wait(lock) __raw_spin_unlock_wait(&(lock)->raw_lock) + +/* + * Pull the _spin_*()/_read_*()/_write_*() functions/declarations: + */ +#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) +# include <linux/spinlock_api_smp.h> +#else +# include <linux/spinlock_api_up.h> +#endif + +#ifdef CONFIG_DEBUG_SPINLOCK + extern void _raw_spin_lock(spinlock_t *lock); +#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock) + extern int _raw_spin_trylock(spinlock_t *lock); + extern void _raw_spin_unlock(spinlock_t *lock); + extern void _raw_read_lock(rwlock_t *lock); + extern int _raw_read_trylock(rwlock_t *lock); + extern void _raw_read_unlock(rwlock_t *lock); + extern void _raw_write_lock(rwlock_t *lock); + extern int _raw_write_trylock(rwlock_t *lock); + extern void _raw_write_unlock(rwlock_t *lock); +#else +# define _raw_spin_lock(lock) __raw_spin_lock(&(lock)->raw_lock) +# define _raw_spin_lock_flags(lock, flags) \ + __raw_spin_lock_flags(&(lock)->raw_lock, *(flags)) +# define _raw_spin_trylock(lock) __raw_spin_trylock(&(lock)->raw_lock) +# define _raw_spin_unlock(lock) __raw_spin_unlock(&(lock)->raw_lock) +# define _raw_read_lock(rwlock) __raw_read_lock(&(rwlock)->raw_lock) +# define _raw_read_trylock(rwlock) __raw_read_trylock(&(rwlock)->raw_lock) +# define _raw_read_unlock(rwlock) __raw_read_unlock(&(rwlock)->raw_lock) +# define _raw_write_lock(rwlock) __raw_write_lock(&(rwlock)->raw_lock) +# define _raw_write_trylock(rwlock) __raw_write_trylock(&(rwlock)->raw_lock) +# define _raw_write_unlock(rwlock) __raw_write_unlock(&(rwlock)->raw_lock) +#endif + +#define read_can_lock(rwlock) __raw_read_can_lock(&(rwlock)->raw_lock) +#define write_can_lock(rwlock) __raw_write_can_lock(&(rwlock)->raw_lock) + +/* + * Define the various spin_lock and rw_lock methods. Note we define these + * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various + * methods are defined as nops in the case they are not required. + */ +#define spin_trylock(lock) __cond_lock(lock, _spin_trylock(lock)) +#define read_trylock(lock) __cond_lock(lock, _read_trylock(lock)) +#define write_trylock(lock) __cond_lock(lock, _write_trylock(lock)) + +#define spin_lock(lock) _spin_lock(lock) + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass) +# define spin_lock_nest_lock(lock, nest_lock) \ + do { \ + typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\ + _spin_lock_nest_lock(lock, &(nest_lock)->dep_map); \ + } while (0) +#else +# define spin_lock_nested(lock, subclass) _spin_lock(lock) +# define spin_lock_nest_lock(lock, nest_lock) _spin_lock(lock) +#endif + +#define write_lock(lock) _write_lock(lock) +#define read_lock(lock) _read_lock(lock) + +#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) + +#define spin_lock_irqsave(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + flags = _spin_lock_irqsave(lock); \ + } while (0) +#define read_lock_irqsave(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + flags = _read_lock_irqsave(lock); \ + } while (0) +#define write_lock_irqsave(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + flags = _write_lock_irqsave(lock); \ + } while (0) + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +#define spin_lock_irqsave_nested(lock, flags, subclass) \ + do { \ + typecheck(unsigned long, flags); \ + flags = _spin_lock_irqsave_nested(lock, subclass); \ + } while (0) +#else +#define spin_lock_irqsave_nested(lock, flags, subclass) \ + do { \ + typecheck(unsigned long, flags); \ + flags = _spin_lock_irqsave(lock); \ + } while (0) +#endif + +#else + +#define spin_lock_irqsave(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + _spin_lock_irqsave(lock, flags); \ + } while (0) +#define read_lock_irqsave(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + _read_lock_irqsave(lock, flags); \ + } while (0) +#define write_lock_irqsave(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + _write_lock_irqsave(lock, flags); \ + } while (0) +#define spin_lock_irqsave_nested(lock, flags, subclass) \ + spin_lock_irqsave(lock, flags) + +#endif + +#define spin_lock_irq(lock) _spin_lock_irq(lock) +#define spin_lock_bh(lock) _spin_lock_bh(lock) + +#define read_lock_irq(lock) _read_lock_irq(lock) +#define read_lock_bh(lock) _read_lock_bh(lock) + +#define write_lock_irq(lock) _write_lock_irq(lock) +#define write_lock_bh(lock) _write_lock_bh(lock) + +/* + * We inline the unlock functions in the nondebug case: + */ +#if defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) || \ + !defined(CONFIG_SMP) +# define spin_unlock(lock) _spin_unlock(lock) +# define read_unlock(lock) _read_unlock(lock) +# define write_unlock(lock) _write_unlock(lock) +# define spin_unlock_irq(lock) _spin_unlock_irq(lock) +# define read_unlock_irq(lock) _read_unlock_irq(lock) +# define write_unlock_irq(lock) _write_unlock_irq(lock) +#else +# define spin_unlock(lock) \ + do {__raw_spin_unlock(&(lock)->raw_lock); __release(lock); } while (0) +# define read_unlock(lock) \ + do {__raw_read_unlock(&(lock)->raw_lock); __release(lock); } while (0) +# define write_unlock(lock) \ + do {__raw_write_unlock(&(lock)->raw_lock); __release(lock); } while (0) +# define spin_unlock_irq(lock) \ +do { \ + __raw_spin_unlock(&(lock)->raw_lock); \ + __release(lock); \ + local_irq_enable(); \ +} while (0) +# define read_unlock_irq(lock) \ +do { \ + __raw_read_unlock(&(lock)->raw_lock); \ + __release(lock); \ + local_irq_enable(); \ +} while (0) +# define write_unlock_irq(lock) \ +do { \ + __raw_write_unlock(&(lock)->raw_lock); \ + __release(lock); \ + local_irq_enable(); \ +} while (0) +#endif + +#define spin_unlock_irqrestore(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + _spin_unlock_irqrestore(lock, flags); \ + } while (0) +#define spin_unlock_bh(lock) _spin_unlock_bh(lock) + +#define read_unlock_irqrestore(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + _read_unlock_irqrestore(lock, flags); \ + } while (0) +#define read_unlock_bh(lock) _read_unlock_bh(lock) + +#define write_unlock_irqrestore(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + _write_unlock_irqrestore(lock, flags); \ + } while (0) +#define write_unlock_bh(lock) _write_unlock_bh(lock) + +#define spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock)) + +#define spin_trylock_irq(lock) \ +({ \ + local_irq_disable(); \ + spin_trylock(lock) ? \ + 1 : ({ local_irq_enable(); 0; }); \ +}) + +#define spin_trylock_irqsave(lock, flags) \ +({ \ + local_irq_save(flags); \ + spin_trylock(lock) ? \ + 1 : ({ local_irq_restore(flags); 0; }); \ +}) + +#define write_trylock_irqsave(lock, flags) \ +({ \ + local_irq_save(flags); \ + write_trylock(lock) ? \ + 1 : ({ local_irq_restore(flags); 0; }); \ +}) + +/* + * Pull the atomic_t declaration: + * (asm-mips/atomic.h needs above definitions) + */ +#include <asm/atomic.h> +/** + * atomic_dec_and_lock - lock on reaching reference count zero + * @atomic: the atomic counter + * @lock: the spinlock in question + * + * Decrements @atomic by 1. If the result is 0, returns true and locks + * @lock. Returns false for all other cases. + */ +extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock); +#define atomic_dec_and_lock(atomic, lock) \ + __cond_lock(lock, _atomic_dec_and_lock(atomic, lock)) + +/** + * spin_can_lock - would spin_trylock() succeed? + * @lock: the spinlock in question. + */ +#define spin_can_lock(lock) (!spin_is_locked(lock)) + +#else /* DDE_LINUX */ + +#define spin_lock_init(l) \ + do { \ + ddekit_lock_init(&(l)->ddekit_lock); \ + (l)->need_init = 0; \ + } while (0); + +#define rwlock_init(l) spin_lock_init(l) + +#define COND_INIT_LOCK(l) \ + do { \ + if ((l)->need_init) spin_lock_init(l); \ + } while (0); + +#define spin_lock(lock) \ + do { \ + COND_INIT_LOCK(lock); \ + preempt_disable(); \ + ddekit_lock_lock(&(lock)->ddekit_lock); \ + } while (0) + +#define read_lock(lock) spin_lock(lock) +#define write_lock(lock) spin_lock(lock) +#define spin_lock_irq(lock) local_irq_disable(); spin_lock(lock) +#define spin_lock_bh(lock) spin_lock(lock) +#define read_lock_irq(lock) spin_lock_irq(lock) +#define read_lock_bh(lock) spin_lock_bh(lock) +#define write_lock_irq(lock) spin_lock_irq(lock) +#define write_lock_bh(lock) spin_lock_bh(lock) + +#define spin_unlock(lock) \ + do { \ + COND_INIT_LOCK(lock); \ + ddekit_lock_unlock(&(lock)->ddekit_lock); \ + preempt_enable(); \ + } while (0) + +#define read_unlock(lock) spin_unlock(lock) +#define write_unlock(lock) spin_unlock(lock) + +#define spin_unlock_irq(lock) spin_unlock(lock); local_irq_enable() +#define spin_unlock_bh(lock) spin_unlock(lock) +#define read_unlock_irq(lock) spin_unlock_irq(lock) +#define read_unlock_bh(lock) spin_unlock_bh(lock) +#define write_unlock_irq(lock) spin_unlock_irq(lock) +#define write_unlock_bh(lock) spin_unlock_bh(lock) + +#define spin_lock_irqsave(lock, flags) \ + do { \ + local_irq_save(flags); \ + spin_lock(lock);\ + } while (0); + +#define read_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) +#define write_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) + +#define spin_unlock_irqrestore(lock, flags) \ + do { \ + spin_unlock(lock); \ + local_irq_restore(flags); \ + } while (0); + +#define read_unlock_irqrestore(lock, flags) spin_unlock_irqrestore(lock, flags) +#define write_unlock_irqrestore(lock, flags) spin_unlock_irqrestore(lock, flags) + +static int __lockfunc spin_trylock(spinlock_t *lock) +{ + COND_INIT_LOCK(lock); + return ddekit_lock_try_lock(&lock->ddekit_lock) == 0; +} + +#define _raw_spin_lock(l) spin_lock(l) +#define _raw_spin_unlock(l) spin_unlock(l) +#define _raw_spin_trylock(l) spin_trylock(l) + +#define spin_trylock_irqsave(lock, flags) \ +({ \ + local_irq_save(flags); \ + spin_trylock(lock) ? \ + 1 : ({ local_irq_restore(flags); 0; }); \ +}) + +#define read_trylock(l) spin_trylock(l) +#define write_trylock(l) read_trylock(l) + +#define spin_is_locked(x) \ + (ddekit_lock_owner(&(x)->ddekit_lock) != 0) + +#define assert_spin_locked(x) BUG_ON(!spin_is_locked(x)) + + +#endif /* DDE_LINUX */ + +#endif /* __LINUX_SPINLOCK_H */ |