diff options
Diffstat (limited to 'include/asm-parisc/spinlock.h')
| -rw-r--r-- | include/asm-parisc/spinlock.h | 163 |
1 files changed, 28 insertions, 135 deletions
diff --git a/include/asm-parisc/spinlock.h b/include/asm-parisc/spinlock.h index 679ea1c..43eaa6e 100644 --- a/include/asm-parisc/spinlock.h +++ b/include/asm-parisc/spinlock.h @@ -2,30 +2,25 @@ #define __ASM_SPINLOCK_H #include <asm/system.h> +#include <asm/processor.h> +#include <asm/spinlock_types.h> /* Note that PA-RISC has to use `1' to mean unlocked and `0' to mean locked * since it only has load-and-zero. Moreover, at least on some PA processors, * the semaphore address has to be 16-byte aligned. */ -#ifndef CONFIG_DEBUG_SPINLOCK - -#define __SPIN_LOCK_UNLOCKED { { 1, 1, 1, 1 } } -#undef SPIN_LOCK_UNLOCKED -#define SPIN_LOCK_UNLOCKED (spinlock_t) __SPIN_LOCK_UNLOCKED - -#define spin_lock_init(x) do { *(x) = SPIN_LOCK_UNLOCKED; } while(0) - -static inline int spin_is_locked(spinlock_t *x) +static inline int __raw_spin_is_locked(raw_spinlock_t *x) { volatile unsigned int *a = __ldcw_align(x); return *a == 0; } -#define spin_unlock_wait(x) do { barrier(); } while(spin_is_locked(x)) -#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock) +#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock) +#define __raw_spin_unlock_wait(x) \ + do { cpu_relax(); } while (__raw_spin_is_locked(x)) -static inline void _raw_spin_lock(spinlock_t *x) +static inline void __raw_spin_lock(raw_spinlock_t *x) { volatile unsigned int *a; @@ -36,7 +31,7 @@ static inline void _raw_spin_lock(spinlock_t *x) mb(); } -static inline void _raw_spin_unlock(spinlock_t *x) +static inline void __raw_spin_unlock(raw_spinlock_t *x) { volatile unsigned int *a; mb(); @@ -45,7 +40,7 @@ static inline void _raw_spin_unlock(spinlock_t *x) mb(); } -static inline int _raw_spin_trylock(spinlock_t *x) +static inline int __raw_spin_trylock(raw_spinlock_t *x) { volatile unsigned int *a; int ret; @@ -57,131 +52,38 @@ static inline int _raw_spin_trylock(spinlock_t *x) return ret; } - -#define spin_lock_own(LOCK, LOCATION) ((void)0) - -#else /* !(CONFIG_DEBUG_SPINLOCK) */ - -#define SPINLOCK_MAGIC 0x1D244B3C - -#define __SPIN_LOCK_UNLOCKED { { 1, 1, 1, 1 }, SPINLOCK_MAGIC, 10, __FILE__ , NULL, 0, -1, NULL, NULL } -#undef SPIN_LOCK_UNLOCKED -#define SPIN_LOCK_UNLOCKED (spinlock_t) __SPIN_LOCK_UNLOCKED - -#define spin_lock_init(x) do { *(x) = SPIN_LOCK_UNLOCKED; } while(0) - -#define CHECK_LOCK(x) \ - do { \ - if (unlikely((x)->magic != SPINLOCK_MAGIC)) { \ - printk(KERN_ERR "%s:%d: spin_is_locked" \ - " on uninitialized spinlock %p.\n", \ - __FILE__, __LINE__, (x)); \ - } \ - } while(0) - -#define spin_is_locked(x) \ - ({ \ - CHECK_LOCK(x); \ - volatile unsigned int *a = __ldcw_align(x); \ - if (unlikely((*a == 0) && (x)->babble)) { \ - (x)->babble--; \ - printk("KERN_WARNING \ - %s:%d: spin_is_locked(%s/%p) already" \ - " locked by %s:%d in %s at %p(%d)\n", \ - __FILE__,__LINE__, (x)->module, (x), \ - (x)->bfile, (x)->bline, (x)->task->comm,\ - (x)->previous, (x)->oncpu); \ - } \ - *a == 0; \ - }) - -#define spin_unlock_wait(x) \ - do { \ - CHECK_LOCK(x); \ - volatile unsigned int *a = __ldcw_align(x); \ - if (unlikely((*a == 0) && (x)->babble)) { \ - (x)->babble--; \ - printk("KERN_WARNING \ - %s:%d: spin_unlock_wait(%s/%p)" \ - " owned by %s:%d in %s at %p(%d)\n", \ - __FILE__,__LINE__, (x)->module, (x), \ - (x)->bfile, (x)->bline, (x)->task->comm,\ - (x)->previous, (x)->oncpu); \ - } \ - barrier(); \ - } while (*((volatile unsigned char *)(__ldcw_align(x))) == 0) - -extern void _dbg_spin_lock(spinlock_t *lock, const char *base_file, int line_no); -extern void _dbg_spin_unlock(spinlock_t *lock, const char *, int); -extern int _dbg_spin_trylock(spinlock_t * lock, const char *, int); - -#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock) - -#define _raw_spin_unlock(lock) _dbg_spin_unlock(lock, __FILE__, __LINE__) -#define _raw_spin_lock(lock) _dbg_spin_lock(lock, __FILE__, __LINE__) -#define _raw_spin_trylock(lock) _dbg_spin_trylock(lock, __FILE__, __LINE__) - -/* just in case we need it */ -#define spin_lock_own(LOCK, LOCATION) \ -do { \ - volatile unsigned int *a = __ldcw_align(LOCK); \ - if (!((*a == 0) && ((LOCK)->oncpu == smp_processor_id()))) \ - printk("KERN_WARNING \ - %s: called on %d from %p but lock %s on %d\n", \ - LOCATION, smp_processor_id(), \ - __builtin_return_address(0), \ - (*a == 0) ? "taken" : "freed", (LOCK)->on_cpu); \ -} while (0) - -#endif /* !(CONFIG_DEBUG_SPINLOCK) */ /* * Read-write spinlocks, allowing multiple readers * but only one writer. */ -typedef struct { - spinlock_t lock; - volatile int counter; -#ifdef CONFIG_PREEMPT - unsigned int break_lock; -#endif -} rwlock_t; - -#define RW_LOCK_UNLOCKED (rwlock_t) { __SPIN_LOCK_UNLOCKED, 0 } - -#define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while (0) -#define _raw_read_trylock(lock) generic_raw_read_trylock(lock) +#define __raw_read_trylock(lock) generic__raw_read_trylock(lock) /* read_lock, read_unlock are pretty straightforward. Of course it somehow * sucks we end up saving/restoring flags twice for read_lock_irqsave aso. */ -#ifdef CONFIG_DEBUG_RWLOCK -extern void _dbg_read_lock(rwlock_t * rw, const char *bfile, int bline); -#define _raw_read_lock(rw) _dbg_read_lock(rw, __FILE__, __LINE__) -#else -static __inline__ void _raw_read_lock(rwlock_t *rw) +static __inline__ void __raw_read_lock(raw_rwlock_t *rw) { unsigned long flags; local_irq_save(flags); - _raw_spin_lock(&rw->lock); + __raw_spin_lock(&rw->lock); rw->counter++; - _raw_spin_unlock(&rw->lock); + __raw_spin_unlock(&rw->lock); local_irq_restore(flags); } -#endif /* CONFIG_DEBUG_RWLOCK */ -static __inline__ void _raw_read_unlock(rwlock_t *rw) +static __inline__ void __raw_read_unlock(raw_rwlock_t *rw) { unsigned long flags; local_irq_save(flags); - _raw_spin_lock(&rw->lock); + __raw_spin_lock(&rw->lock); rw->counter--; - _raw_spin_unlock(&rw->lock); + __raw_spin_unlock(&rw->lock); local_irq_restore(flags); } @@ -194,20 +96,17 @@ static __inline__ void _raw_read_unlock(rwlock_t *rw) * writers) in interrupt handlers someone fucked up and we'd dead-lock * sooner or later anyway. prumpf */ -#ifdef CONFIG_DEBUG_RWLOCK -extern void _dbg_write_lock(rwlock_t * rw, const char *bfile, int bline); -#define _raw_write_lock(rw) _dbg_write_lock(rw, __FILE__, __LINE__) -#else -static __inline__ void _raw_write_lock(rwlock_t *rw) +static __inline__ void __raw_write_lock(raw_rwlock_t *rw) { retry: - _raw_spin_lock(&rw->lock); + __raw_spin_lock(&rw->lock); if(rw->counter != 0) { /* this basically never happens */ - _raw_spin_unlock(&rw->lock); + __raw_spin_unlock(&rw->lock); - while(rw->counter != 0); + while (rw->counter != 0) + cpu_relax(); goto retry; } @@ -215,26 +114,21 @@ retry: /* got it. now leave without unlocking */ rw->counter = -1; /* remember we are locked */ } -#endif /* CONFIG_DEBUG_RWLOCK */ /* write_unlock is absolutely trivial - we don't have to wait for anything */ -static __inline__ void _raw_write_unlock(rwlock_t *rw) +static __inline__ void __raw_write_unlock(raw_rwlock_t *rw) { rw->counter = 0; - _raw_spin_unlock(&rw->lock); + __raw_spin_unlock(&rw->lock); } -#ifdef CONFIG_DEBUG_RWLOCK -extern int _dbg_write_trylock(rwlock_t * rw, const char *bfile, int bline); -#define _raw_write_trylock(rw) _dbg_write_trylock(rw, __FILE__, __LINE__) -#else -static __inline__ int _raw_write_trylock(rwlock_t *rw) +static __inline__ int __raw_write_trylock(raw_rwlock_t *rw) { - _raw_spin_lock(&rw->lock); + __raw_spin_lock(&rw->lock); if (rw->counter != 0) { /* this basically never happens */ - _raw_spin_unlock(&rw->lock); + __raw_spin_unlock(&rw->lock); return 0; } @@ -243,14 +137,13 @@ static __inline__ int _raw_write_trylock(rwlock_t *rw) rw->counter = -1; /* remember we are locked */ return 1; } -#endif /* CONFIG_DEBUG_RWLOCK */ -static __inline__ int is_read_locked(rwlock_t *rw) +static __inline__ int __raw_is_read_locked(raw_rwlock_t *rw) { return rw->counter > 0; } -static __inline__ int is_write_locked(rwlock_t *rw) +static __inline__ int __raw_is_write_locked(raw_rwlock_t *rw) { return rw->counter < 0; } |
