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Diffstat (limited to 'arch/s390/include/asm/rwsem.h')
-rw-r--r--arch/s390/include/asm/rwsem.h277
1 files changed, 104 insertions, 173 deletions
diff --git a/arch/s390/include/asm/rwsem.h b/arch/s390/include/asm/rwsem.h
index 9d2a1797180..487f9b64efb 100644
--- a/arch/s390/include/asm/rwsem.h
+++ b/arch/s390/include/asm/rwsem.h
@@ -2,10 +2,8 @@
#define _S390_RWSEM_H
/*
- * include/asm-s390/rwsem.h
- *
* S390 version
- * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Copyright IBM Corp. 2002
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* Based on asm-alpha/semaphore.h and asm-i386/rwsem.h
@@ -41,81 +39,21 @@
#error "please don't include asm/rwsem.h directly, use linux/rwsem.h instead"
#endif
-#ifdef __KERNEL__
-
-#include <linux/list.h>
-#include <linux/spinlock.h>
-
-struct rwsem_waiter;
-
-extern struct rw_semaphore *rwsem_down_read_failed(struct rw_semaphore *);
-extern struct rw_semaphore *rwsem_down_write_failed(struct rw_semaphore *);
-extern struct rw_semaphore *rwsem_wake(struct rw_semaphore *);
-extern struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *);
-extern struct rw_semaphore *rwsem_downgrade_write(struct rw_semaphore *);
-
-/*
- * the semaphore definition
- */
-struct rw_semaphore {
- signed long count;
- spinlock_t wait_lock;
- struct list_head wait_list;
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
- struct lockdep_map dep_map;
-#endif
-};
-
-#ifndef __s390x__
+#ifndef CONFIG_64BIT
#define RWSEM_UNLOCKED_VALUE 0x00000000
#define RWSEM_ACTIVE_BIAS 0x00000001
#define RWSEM_ACTIVE_MASK 0x0000ffff
#define RWSEM_WAITING_BIAS (-0x00010000)
-#else /* __s390x__ */
+#else /* CONFIG_64BIT */
#define RWSEM_UNLOCKED_VALUE 0x0000000000000000L
#define RWSEM_ACTIVE_BIAS 0x0000000000000001L
#define RWSEM_ACTIVE_MASK 0x00000000ffffffffL
#define RWSEM_WAITING_BIAS (-0x0000000100000000L)
-#endif /* __s390x__ */
+#endif /* CONFIG_64BIT */
#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
/*
- * initialisation
- */
-
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-# define __RWSEM_DEP_MAP_INIT(lockname) , .dep_map = { .name = #lockname }
-#else
-# define __RWSEM_DEP_MAP_INIT(lockname)
-#endif
-
-#define __RWSEM_INITIALIZER(name) \
- { RWSEM_UNLOCKED_VALUE, __SPIN_LOCK_UNLOCKED((name).wait.lock), \
- LIST_HEAD_INIT((name).wait_list) __RWSEM_DEP_MAP_INIT(name) }
-
-#define DECLARE_RWSEM(name) \
- struct rw_semaphore name = __RWSEM_INITIALIZER(name)
-
-static inline void init_rwsem(struct rw_semaphore *sem)
-{
- sem->count = RWSEM_UNLOCKED_VALUE;
- spin_lock_init(&sem->wait_lock);
- INIT_LIST_HEAD(&sem->wait_list);
-}
-
-extern void __init_rwsem(struct rw_semaphore *sem, const char *name,
- struct lock_class_key *key);
-
-#define init_rwsem(sem) \
-do { \
- static struct lock_class_key __key; \
- \
- __init_rwsem((sem), #sem, &__key); \
-} while (0)
-
-
-/*
* lock for reading
*/
static inline void __down_read(struct rw_semaphore *sem)
@@ -123,22 +61,22 @@ static inline void __down_read(struct rw_semaphore *sem)
signed long old, new;
asm volatile(
-#ifndef __s390x__
- " l %0,0(%3)\n"
+#ifndef CONFIG_64BIT
+ " l %0,%2\n"
"0: lr %1,%0\n"
- " ahi %1,%5\n"
- " cs %0,%1,0(%3)\n"
+ " ahi %1,%4\n"
+ " cs %0,%1,%2\n"
" jl 0b"
-#else /* __s390x__ */
- " lg %0,0(%3)\n"
+#else /* CONFIG_64BIT */
+ " lg %0,%2\n"
"0: lgr %1,%0\n"
- " aghi %1,%5\n"
- " csg %0,%1,0(%3)\n"
+ " aghi %1,%4\n"
+ " csg %0,%1,%2\n"
" jl 0b"
-#endif /* __s390x__ */
- : "=&d" (old), "=&d" (new), "=m" (sem->count)
- : "a" (&sem->count), "m" (sem->count),
- "i" (RWSEM_ACTIVE_READ_BIAS) : "cc", "memory");
+#endif /* CONFIG_64BIT */
+ : "=&d" (old), "=&d" (new), "=Q" (sem->count)
+ : "Q" (sem->count), "i" (RWSEM_ACTIVE_READ_BIAS)
+ : "cc", "memory");
if (old < 0)
rwsem_down_read_failed(sem);
}
@@ -151,26 +89,26 @@ static inline int __down_read_trylock(struct rw_semaphore *sem)
signed long old, new;
asm volatile(
-#ifndef __s390x__
- " l %0,0(%3)\n"
+#ifndef CONFIG_64BIT
+ " l %0,%2\n"
"0: ltr %1,%0\n"
" jm 1f\n"
- " ahi %1,%5\n"
- " cs %0,%1,0(%3)\n"
+ " ahi %1,%4\n"
+ " cs %0,%1,%2\n"
" jl 0b\n"
"1:"
-#else /* __s390x__ */
- " lg %0,0(%3)\n"
+#else /* CONFIG_64BIT */
+ " lg %0,%2\n"
"0: ltgr %1,%0\n"
" jm 1f\n"
- " aghi %1,%5\n"
- " csg %0,%1,0(%3)\n"
+ " aghi %1,%4\n"
+ " csg %0,%1,%2\n"
" jl 0b\n"
"1:"
-#endif /* __s390x__ */
- : "=&d" (old), "=&d" (new), "=m" (sem->count)
- : "a" (&sem->count), "m" (sem->count),
- "i" (RWSEM_ACTIVE_READ_BIAS) : "cc", "memory");
+#endif /* CONFIG_64BIT */
+ : "=&d" (old), "=&d" (new), "=Q" (sem->count)
+ : "Q" (sem->count), "i" (RWSEM_ACTIVE_READ_BIAS)
+ : "cc", "memory");
return old >= 0 ? 1 : 0;
}
@@ -183,21 +121,21 @@ static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
tmp = RWSEM_ACTIVE_WRITE_BIAS;
asm volatile(
-#ifndef __s390x__
- " l %0,0(%3)\n"
+#ifndef CONFIG_64BIT
+ " l %0,%2\n"
"0: lr %1,%0\n"
- " a %1,%5\n"
- " cs %0,%1,0(%3)\n"
+ " a %1,%4\n"
+ " cs %0,%1,%2\n"
" jl 0b"
-#else /* __s390x__ */
- " lg %0,0(%3)\n"
+#else /* CONFIG_64BIT */
+ " lg %0,%2\n"
"0: lgr %1,%0\n"
- " ag %1,%5\n"
- " csg %0,%1,0(%3)\n"
+ " ag %1,%4\n"
+ " csg %0,%1,%2\n"
" jl 0b"
-#endif /* __s390x__ */
- : "=&d" (old), "=&d" (new), "=m" (sem->count)
- : "a" (&sem->count), "m" (sem->count), "m" (tmp)
+#endif /* CONFIG_64BIT */
+ : "=&d" (old), "=&d" (new), "=Q" (sem->count)
+ : "Q" (sem->count), "m" (tmp)
: "cc", "memory");
if (old != 0)
rwsem_down_write_failed(sem);
@@ -216,23 +154,23 @@ static inline int __down_write_trylock(struct rw_semaphore *sem)
signed long old;
asm volatile(
-#ifndef __s390x__
- " l %0,0(%2)\n"
+#ifndef CONFIG_64BIT
+ " l %0,%1\n"
"0: ltr %0,%0\n"
" jnz 1f\n"
- " cs %0,%4,0(%2)\n"
+ " cs %0,%3,%1\n"
" jl 0b\n"
-#else /* __s390x__ */
- " lg %0,0(%2)\n"
+#else /* CONFIG_64BIT */
+ " lg %0,%1\n"
"0: ltgr %0,%0\n"
" jnz 1f\n"
- " csg %0,%4,0(%2)\n"
+ " csg %0,%3,%1\n"
" jl 0b\n"
-#endif /* __s390x__ */
+#endif /* CONFIG_64BIT */
"1:"
- : "=&d" (old), "=m" (sem->count)
- : "a" (&sem->count), "m" (sem->count),
- "d" (RWSEM_ACTIVE_WRITE_BIAS) : "cc", "memory");
+ : "=&d" (old), "=Q" (sem->count)
+ : "Q" (sem->count), "d" (RWSEM_ACTIVE_WRITE_BIAS)
+ : "cc", "memory");
return (old == RWSEM_UNLOCKED_VALUE) ? 1 : 0;
}
@@ -244,22 +182,21 @@ static inline void __up_read(struct rw_semaphore *sem)
signed long old, new;
asm volatile(
-#ifndef __s390x__
- " l %0,0(%3)\n"
+#ifndef CONFIG_64BIT
+ " l %0,%2\n"
"0: lr %1,%0\n"
- " ahi %1,%5\n"
- " cs %0,%1,0(%3)\n"
+ " ahi %1,%4\n"
+ " cs %0,%1,%2\n"
" jl 0b"
-#else /* __s390x__ */
- " lg %0,0(%3)\n"
+#else /* CONFIG_64BIT */
+ " lg %0,%2\n"
"0: lgr %1,%0\n"
- " aghi %1,%5\n"
- " csg %0,%1,0(%3)\n"
+ " aghi %1,%4\n"
+ " csg %0,%1,%2\n"
" jl 0b"
-#endif /* __s390x__ */
- : "=&d" (old), "=&d" (new), "=m" (sem->count)
- : "a" (&sem->count), "m" (sem->count),
- "i" (-RWSEM_ACTIVE_READ_BIAS)
+#endif /* CONFIG_64BIT */
+ : "=&d" (old), "=&d" (new), "=Q" (sem->count)
+ : "Q" (sem->count), "i" (-RWSEM_ACTIVE_READ_BIAS)
: "cc", "memory");
if (new < 0)
if ((new & RWSEM_ACTIVE_MASK) == 0)
@@ -275,21 +212,21 @@ static inline void __up_write(struct rw_semaphore *sem)
tmp = -RWSEM_ACTIVE_WRITE_BIAS;
asm volatile(
-#ifndef __s390x__
- " l %0,0(%3)\n"
+#ifndef CONFIG_64BIT
+ " l %0,%2\n"
"0: lr %1,%0\n"
- " a %1,%5\n"
- " cs %0,%1,0(%3)\n"
+ " a %1,%4\n"
+ " cs %0,%1,%2\n"
" jl 0b"
-#else /* __s390x__ */
- " lg %0,0(%3)\n"
+#else /* CONFIG_64BIT */
+ " lg %0,%2\n"
"0: lgr %1,%0\n"
- " ag %1,%5\n"
- " csg %0,%1,0(%3)\n"
+ " ag %1,%4\n"
+ " csg %0,%1,%2\n"
" jl 0b"
-#endif /* __s390x__ */
- : "=&d" (old), "=&d" (new), "=m" (sem->count)
- : "a" (&sem->count), "m" (sem->count), "m" (tmp)
+#endif /* CONFIG_64BIT */
+ : "=&d" (old), "=&d" (new), "=Q" (sem->count)
+ : "Q" (sem->count), "m" (tmp)
: "cc", "memory");
if (new < 0)
if ((new & RWSEM_ACTIVE_MASK) == 0)
@@ -305,21 +242,21 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
tmp = -RWSEM_WAITING_BIAS;
asm volatile(
-#ifndef __s390x__
- " l %0,0(%3)\n"
+#ifndef CONFIG_64BIT
+ " l %0,%2\n"
"0: lr %1,%0\n"
- " a %1,%5\n"
- " cs %0,%1,0(%3)\n"
+ " a %1,%4\n"
+ " cs %0,%1,%2\n"
" jl 0b"
-#else /* __s390x__ */
- " lg %0,0(%3)\n"
+#else /* CONFIG_64BIT */
+ " lg %0,%2\n"
"0: lgr %1,%0\n"
- " ag %1,%5\n"
- " csg %0,%1,0(%3)\n"
+ " ag %1,%4\n"
+ " csg %0,%1,%2\n"
" jl 0b"
-#endif /* __s390x__ */
- : "=&d" (old), "=&d" (new), "=m" (sem->count)
- : "a" (&sem->count), "m" (sem->count), "m" (tmp)
+#endif /* CONFIG_64BIT */
+ : "=&d" (old), "=&d" (new), "=Q" (sem->count)
+ : "Q" (sem->count), "m" (tmp)
: "cc", "memory");
if (new > 1)
rwsem_downgrade_wake(sem);
@@ -333,21 +270,21 @@ static inline void rwsem_atomic_add(long delta, struct rw_semaphore *sem)
signed long old, new;
asm volatile(
-#ifndef __s390x__
- " l %0,0(%3)\n"
+#ifndef CONFIG_64BIT
+ " l %0,%2\n"
"0: lr %1,%0\n"
- " ar %1,%5\n"
- " cs %0,%1,0(%3)\n"
+ " ar %1,%4\n"
+ " cs %0,%1,%2\n"
" jl 0b"
-#else /* __s390x__ */
- " lg %0,0(%3)\n"
+#else /* CONFIG_64BIT */
+ " lg %0,%2\n"
"0: lgr %1,%0\n"
- " agr %1,%5\n"
- " csg %0,%1,0(%3)\n"
+ " agr %1,%4\n"
+ " csg %0,%1,%2\n"
" jl 0b"
-#endif /* __s390x__ */
- : "=&d" (old), "=&d" (new), "=m" (sem->count)
- : "a" (&sem->count), "m" (sem->count), "d" (delta)
+#endif /* CONFIG_64BIT */
+ : "=&d" (old), "=&d" (new), "=Q" (sem->count)
+ : "Q" (sem->count), "d" (delta)
: "cc", "memory");
}
@@ -359,29 +296,23 @@ static inline long rwsem_atomic_update(long delta, struct rw_semaphore *sem)
signed long old, new;
asm volatile(
-#ifndef __s390x__
- " l %0,0(%3)\n"
+#ifndef CONFIG_64BIT
+ " l %0,%2\n"
"0: lr %1,%0\n"
- " ar %1,%5\n"
- " cs %0,%1,0(%3)\n"
+ " ar %1,%4\n"
+ " cs %0,%1,%2\n"
" jl 0b"
-#else /* __s390x__ */
- " lg %0,0(%3)\n"
+#else /* CONFIG_64BIT */
+ " lg %0,%2\n"
"0: lgr %1,%0\n"
- " agr %1,%5\n"
- " csg %0,%1,0(%3)\n"
+ " agr %1,%4\n"
+ " csg %0,%1,%2\n"
" jl 0b"
-#endif /* __s390x__ */
- : "=&d" (old), "=&d" (new), "=m" (sem->count)
- : "a" (&sem->count), "m" (sem->count), "d" (delta)
+#endif /* CONFIG_64BIT */
+ : "=&d" (old), "=&d" (new), "=Q" (sem->count)
+ : "Q" (sem->count), "d" (delta)
: "cc", "memory");
return new;
}
-static inline int rwsem_is_locked(struct rw_semaphore *sem)
-{
- return (sem->count != 0);
-}
-
-#endif /* __KERNEL__ */
#endif /* _S390_RWSEM_H */
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