X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-ppc64%2Fspinlock.h;h=14cb895bb607245477e4dc466e7dd6a227491956;hb=abf914208a1e120446ea4f9bc26406bd3a4579e1;hp=acd11564dd752d64a8e29951e3beb55eee0f09c4;hpb=27b030d58c8e72fc7a95187a791bd9406e350f02;p=linux-2.6 diff --git a/include/asm-ppc64/spinlock.h b/include/asm-ppc64/spinlock.h index acd11564dd..14cb895bb6 100644 --- a/include/asm-ppc64/spinlock.h +++ b/include/asm-ppc64/spinlock.h @@ -15,36 +15,42 @@ * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. + * + * (the type definitions are in asm/spinlock_types.h) */ #include #include #include #include -typedef struct { - volatile unsigned int lock; -#ifdef CONFIG_PREEMPT - unsigned int break_lock; -#endif -} spinlock_t; +#define __raw_spin_is_locked(x) ((x)->slock != 0) -typedef struct { - volatile signed int lock; -#ifdef CONFIG_PREEMPT - unsigned int break_lock; -#endif -} rwlock_t; +/* + * This returns the old value in the lock, so we succeeded + * in getting the lock if the return value is 0. + */ +static __inline__ unsigned long __spin_trylock(raw_spinlock_t *lock) +{ + unsigned long tmp, tmp2; -#ifdef __KERNEL__ -#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 } + __asm__ __volatile__( +" lwz %1,%3(13) # __spin_trylock\n\ +1: lwarx %0,0,%2\n\ + cmpwi 0,%0,0\n\ + bne- 2f\n\ + stwcx. %1,0,%2\n\ + bne- 1b\n\ + isync\n\ +2:" : "=&r" (tmp), "=&r" (tmp2) + : "r" (&lock->slock), "i" (offsetof(struct paca_struct, lock_token)) + : "cr0", "memory"); -#define spin_is_locked(x) ((x)->lock != 0) -#define spin_lock_init(x) do { *(x) = SPIN_LOCK_UNLOCKED; } while(0) + return tmp; +} -static __inline__ void _raw_spin_unlock(spinlock_t *lock) +static int __inline__ __raw_spin_trylock(raw_spinlock_t *lock) { - __asm__ __volatile__("lwsync # spin_unlock": : :"memory"); - lock->lock = 0; + return __spin_trylock(lock) == 0; } /* @@ -64,44 +70,15 @@ static __inline__ void _raw_spin_unlock(spinlock_t *lock) #if defined(CONFIG_PPC_SPLPAR) || defined(CONFIG_PPC_ISERIES) /* We only yield to the hypervisor if we are in shared processor mode */ #define SHARED_PROCESSOR (get_paca()->lppaca.shared_proc) -extern void __spin_yield(spinlock_t *lock); -extern void __rw_yield(rwlock_t *lock); +extern void __spin_yield(raw_spinlock_t *lock); +extern void __rw_yield(raw_rwlock_t *lock); #else /* SPLPAR || ISERIES */ #define __spin_yield(x) barrier() #define __rw_yield(x) barrier() #define SHARED_PROCESSOR 0 #endif -extern void spin_unlock_wait(spinlock_t *lock); - -/* - * This returns the old value in the lock, so we succeeded - * in getting the lock if the return value is 0. - */ -static __inline__ unsigned long __spin_trylock(spinlock_t *lock) -{ - unsigned long tmp, tmp2; - - __asm__ __volatile__( -" lwz %1,%3(13) # __spin_trylock\n\ -1: lwarx %0,0,%2\n\ - cmpwi 0,%0,0\n\ - bne- 2f\n\ - stwcx. %1,0,%2\n\ - bne- 1b\n\ - isync\n\ -2:" : "=&r" (tmp), "=&r" (tmp2) - : "r" (&lock->lock), "i" (offsetof(struct paca_struct, lock_token)) - : "cr0", "memory"); - - return tmp; -} - -static int __inline__ _raw_spin_trylock(spinlock_t *lock) -{ - return __spin_trylock(lock) == 0; -} -static void __inline__ _raw_spin_lock(spinlock_t *lock) +static void __inline__ __raw_spin_lock(raw_spinlock_t *lock) { while (1) { if (likely(__spin_trylock(lock) == 0)) @@ -110,12 +87,12 @@ static void __inline__ _raw_spin_lock(spinlock_t *lock) HMT_low(); if (SHARED_PROCESSOR) __spin_yield(lock); - } while (unlikely(lock->lock != 0)); + } while (unlikely(lock->slock != 0)); HMT_medium(); } } -static void __inline__ _raw_spin_lock_flags(spinlock_t *lock, unsigned long flags) +static void __inline__ __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags) { unsigned long flags_dis; @@ -128,12 +105,20 @@ static void __inline__ _raw_spin_lock_flags(spinlock_t *lock, unsigned long flag HMT_low(); if (SHARED_PROCESSOR) __spin_yield(lock); - } while (unlikely(lock->lock != 0)); + } while (unlikely(lock->slock != 0)); HMT_medium(); local_irq_restore(flags_dis); } } +static __inline__ void __raw_spin_unlock(raw_spinlock_t *lock) +{ + __asm__ __volatile__("lwsync # __raw_spin_unlock": : :"memory"); + lock->slock = 0; +} + +extern void __raw_spin_unlock_wait(raw_spinlock_t *lock); + /* * Read-write spinlocks, allowing multiple readers * but only one writer. @@ -144,24 +129,15 @@ static void __inline__ _raw_spin_lock_flags(spinlock_t *lock, unsigned long flag * irq-safe write-lock, but readers can get non-irqsafe * read-locks. */ -#define RW_LOCK_UNLOCKED (rwlock_t) { 0 } -#define rwlock_init(x) do { *(x) = RW_LOCK_UNLOCKED; } while(0) - -#define read_can_lock(rw) ((rw)->lock >= 0) -#define write_can_lock(rw) (!(rw)->lock) - -static __inline__ void _raw_write_unlock(rwlock_t *rw) -{ - __asm__ __volatile__("lwsync # write_unlock": : :"memory"); - rw->lock = 0; -} +#define __raw_read_can_lock(rw) ((rw)->lock >= 0) +#define __raw_write_can_lock(rw) (!(rw)->lock) /* * This returns the old value in the lock + 1, * so we got a read lock if the return value is > 0. */ -static long __inline__ __read_trylock(rwlock_t *rw) +static long __inline__ __read_trylock(raw_rwlock_t *rw) { long tmp; @@ -180,45 +156,11 @@ static long __inline__ __read_trylock(rwlock_t *rw) return tmp; } -static int __inline__ _raw_read_trylock(rwlock_t *rw) -{ - return __read_trylock(rw) > 0; -} - -static void __inline__ _raw_read_lock(rwlock_t *rw) -{ - while (1) { - if (likely(__read_trylock(rw) > 0)) - break; - do { - HMT_low(); - if (SHARED_PROCESSOR) - __rw_yield(rw); - } while (unlikely(rw->lock < 0)); - HMT_medium(); - } -} - -static void __inline__ _raw_read_unlock(rwlock_t *rw) -{ - long tmp; - - __asm__ __volatile__( - "eieio # read_unlock\n\ -1: lwarx %0,0,%1\n\ - addic %0,%0,-1\n\ - stwcx. %0,0,%1\n\ - bne- 1b" - : "=&r"(tmp) - : "r"(&rw->lock) - : "cr0", "memory"); -} - /* * This returns the old value in the lock, * so we got the write lock if the return value is 0. */ -static __inline__ long __write_trylock(rwlock_t *rw) +static __inline__ long __write_trylock(raw_rwlock_t *rw) { long tmp, tmp2; @@ -237,12 +179,21 @@ static __inline__ long __write_trylock(rwlock_t *rw) return tmp; } -static int __inline__ _raw_write_trylock(rwlock_t *rw) +static void __inline__ __raw_read_lock(raw_rwlock_t *rw) { - return __write_trylock(rw) == 0; + while (1) { + if (likely(__read_trylock(rw) > 0)) + break; + do { + HMT_low(); + if (SHARED_PROCESSOR) + __rw_yield(rw); + } while (unlikely(rw->lock < 0)); + HMT_medium(); + } } -static void __inline__ _raw_write_lock(rwlock_t *rw) +static void __inline__ __raw_write_lock(raw_rwlock_t *rw) { while (1) { if (likely(__write_trylock(rw) == 0)) @@ -256,5 +207,35 @@ static void __inline__ _raw_write_lock(rwlock_t *rw) } } -#endif /* __KERNEL__ */ +static int __inline__ __raw_read_trylock(raw_rwlock_t *rw) +{ + return __read_trylock(rw) > 0; +} + +static int __inline__ __raw_write_trylock(raw_rwlock_t *rw) +{ + return __write_trylock(rw) == 0; +} + +static void __inline__ __raw_read_unlock(raw_rwlock_t *rw) +{ + long tmp; + + __asm__ __volatile__( + "eieio # read_unlock\n\ +1: lwarx %0,0,%1\n\ + addic %0,%0,-1\n\ + stwcx. %0,0,%1\n\ + bne- 1b" + : "=&r"(tmp) + : "r"(&rw->lock) + : "cr0", "memory"); +} + +static __inline__ void __raw_write_unlock(raw_rwlock_t *rw) +{ + __asm__ __volatile__("lwsync # write_unlock": : :"memory"); + rw->lock = 0; +} + #endif /* __ASM_SPINLOCK_H */