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s390/atomic: make use of interlocked-access facility 1 instructions 

Same as for bitops: make use of the interlocked-access facility 1
instructions which allow to atomically update storage locations
without a compare-and-swap loop.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
hifive-unleashed-5.1
Heiko Carstens 2013-09-11 16:34:04 +02:00 committed by Martin Schwidefsky
parent 86d51bc31f
commit 75287430b4
1 changed files with 65 additions and 12 deletions
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77
arch/s390/include/asm/atomic.h
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@ -19,7 +19,31 @@
#define ATOMIC_INIT(i) { (i) }
#define __CS_LOOP(ptr, op_val, op_string) ({ \
#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
#define __ATOMIC_OR "lao"
#define __ATOMIC_AND "lan"
#define __ATOMIC_ADD "laa"
#define __ATOMIC_LOOP(ptr, op_val, op_string) \
({ \
int old_val; \
asm volatile( \
op_string " %0,%2,%1\n" \
: "=d" (old_val), "+Q" (((atomic_t *)(ptr))->counter) \
: "d" (op_val) \
: "cc", "memory"); \
old_val; \
})
#else /* CONFIG_HAVE_MARCH_Z196_FEATURES */
#define __ATOMIC_OR "or"
#define __ATOMIC_AND "nr"
#define __ATOMIC_ADD "ar"
#define __ATOMIC_LOOP(ptr, op_val, op_string) \
({ \
int old_val, new_val; \
asm volatile( \
" l %0,%2\n" \
@ -31,9 +55,11 @@
"=Q" (((atomic_t *)(ptr))->counter) \
: "d" (op_val), "Q" (((atomic_t *)(ptr))->counter) \
: "cc", "memory"); \
new_val; \
old_val; \
})
#endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */
static inline int atomic_read(const atomic_t *v)
{
int c;
@ -53,8 +79,9 @@ static inline void atomic_set(atomic_t *v, int i)
static inline int atomic_add_return(int i, atomic_t *v)
{
return __CS_LOOP(v, i, "ar");
return __ATOMIC_LOOP(v, i, __ATOMIC_ADD) + i;
}
#define atomic_add(_i, _v) atomic_add_return(_i, _v)
#define atomic_add_negative(_i, _v) (atomic_add_return(_i, _v) < 0)
#define atomic_inc(_v) atomic_add_return(1, _v)
@ -69,12 +96,12 @@ static inline int atomic_add_return(int i, atomic_t *v)
static inline void atomic_clear_mask(unsigned long mask, atomic_t *v)
{
__CS_LOOP(v, ~mask, "nr");
__ATOMIC_LOOP(v, ~mask, __ATOMIC_AND);
}
static inline void atomic_set_mask(unsigned long mask, atomic_t *v)
{
__CS_LOOP(v, mask, "or");
__ATOMIC_LOOP(v, mask, __ATOMIC_OR);
}
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
@ -105,13 +132,37 @@ static inline int __atomic_add_unless(atomic_t *v, int a, int u)
}
#undef __CS_LOOP
#undef __ATOMIC_LOOP
#define ATOMIC64_INIT(i) { (i) }
#ifdef CONFIG_64BIT
#define __CSG_LOOP(ptr, op_val, op_string) ({ \
#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
#define __ATOMIC64_OR "laog"
#define __ATOMIC64_AND "lang"
#define __ATOMIC64_ADD "laag"
#define __ATOMIC64_LOOP(ptr, op_val, op_string) \
({ \
long long old_val; \
asm volatile( \
op_string " %0,%2,%1\n" \
: "=d" (old_val), "+Q" (((atomic_t *)(ptr))->counter) \
: "d" (op_val) \
: "cc", "memory"); \
old_val; \
})
#else /* CONFIG_HAVE_MARCH_Z196_FEATURES */
#define __ATOMIC64_OR "ogr"
#define __ATOMIC64_AND "ngr"
#define __ATOMIC64_ADD "agr"
#define __ATOMIC64_LOOP(ptr, op_val, op_string) \
({ \
long long old_val, new_val; \
asm volatile( \
" lg %0,%2\n" \
@ -123,9 +174,11 @@ static inline int __atomic_add_unless(atomic_t *v, int a, int u)
"=Q" (((atomic_t *)(ptr))->counter) \
: "d" (op_val), "Q" (((atomic_t *)(ptr))->counter) \
: "cc", "memory"); \
new_val; \
old_val; \
})
#endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */
static inline long long atomic64_read(const atomic64_t *v)
{
long long c;
@ -145,17 +198,17 @@ static inline void atomic64_set(atomic64_t *v, long long i)
static inline long long atomic64_add_return(long long i, atomic64_t *v)
{
return __CSG_LOOP(v, i, "agr");
return __ATOMIC64_LOOP(v, i, __ATOMIC64_ADD) + i;
}
static inline void atomic64_clear_mask(unsigned long mask, atomic64_t *v)
{
__CSG_LOOP(v, ~mask, "ngr");
__ATOMIC64_LOOP(v, ~mask, __ATOMIC64_AND);
}
static inline void atomic64_set_mask(unsigned long mask, atomic64_t *v)
{
__CSG_LOOP(v, mask, "ogr");
__ATOMIC64_LOOP(v, mask, __ATOMIC64_OR);
}
#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
@ -171,7 +224,7 @@ static inline long long atomic64_cmpxchg(atomic64_t *v,
return old;
}
#undef __CSG_LOOP
#undef __ATOMIC64_LOOP
#else /* CONFIG_64BIT */