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authorBoqun Feng <boqun.feng@gmail.com>2016-01-06 10:08:25 +0800
committerMichael Ellerman <mpe@ellerman.id.au>2016-02-18 00:11:21 +1100
commitdc53617c4a3f6ca35641dfd4279720365ce9f4da (patch)
tree925cc4b32384a52b9b10ed2e5136829fde079b80 /arch
parente1ab7f39d7e0dbfbdefe148be3ae4ee121e47ecc (diff)
powerpc: atomic: Implement atomic{, 64}_*_return_* variants
On powerpc, acquire and release semantics can be achieved with lightweight barriers("lwsync" and "ctrl+isync"), which can be used to implement __atomic_op_{acquire,release}. For release semantics, since we only need to ensure all memory accesses that issue before must take effects before the -store- part of the atomics, "lwsync" is what we only need. On the platform without "lwsync", "sync" should be used. Therefore in __atomic_op_release() we use PPC_RELEASE_BARRIER. For acquire semantics, "lwsync" is what we only need for the similar reason. However on the platform without "lwsync", we can use "isync" rather than "sync" as an acquire barrier. Therefore in __atomic_op_acquire() we use PPC_ACQUIRE_BARRIER, which is barrier() on UP, "lwsync" if available and "isync" otherwise. Implement atomic{,64}_{add,sub,inc,dec}_return_relaxed, and build other variants with these helpers. Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/include/asm/atomic.h147
1 files changed, 85 insertions, 62 deletions
diff --git a/arch/powerpc/include/asm/atomic.h b/arch/powerpc/include/asm/atomic.h
index 55f106ed12bf..a35c27709e05 100644
--- a/arch/powerpc/include/asm/atomic.h
+++ b/arch/powerpc/include/asm/atomic.h
@@ -12,6 +12,24 @@
#define ATOMIC_INIT(i) { (i) }
+/*
+ * Since *_return_relaxed and {cmp}xchg_relaxed are implemented with
+ * a "bne-" instruction at the end, so an isync is enough as a acquire barrier
+ * on the platform without lwsync.
+ */
+#define __atomic_op_acquire(op, args...) \
+({ \
+ typeof(op##_relaxed(args)) __ret = op##_relaxed(args); \
+ __asm__ __volatile__(PPC_ACQUIRE_BARRIER "" : : : "memory"); \
+ __ret; \
+})
+
+#define __atomic_op_release(op, args...) \
+({ \
+ __asm__ __volatile__(PPC_RELEASE_BARRIER "" : : : "memory"); \
+ op##_relaxed(args); \
+})
+
static __inline__ int atomic_read(const atomic_t *v)
{
int t;
@@ -42,27 +60,27 @@ static __inline__ void atomic_##op(int a, atomic_t *v) \
: "cc"); \
} \
-#define ATOMIC_OP_RETURN(op, asm_op) \
-static __inline__ int atomic_##op##_return(int a, atomic_t *v) \
+#define ATOMIC_OP_RETURN_RELAXED(op, asm_op) \
+static inline int atomic_##op##_return_relaxed(int a, atomic_t *v) \
{ \
int t; \
\
__asm__ __volatile__( \
- PPC_ATOMIC_ENTRY_BARRIER \
-"1: lwarx %0,0,%2 # atomic_" #op "_return\n" \
- #asm_op " %0,%1,%0\n" \
- PPC405_ERR77(0,%2) \
-" stwcx. %0,0,%2 \n" \
+"1: lwarx %0,0,%3 # atomic_" #op "_return_relaxed\n" \
+ #asm_op " %0,%2,%0\n" \
+ PPC405_ERR77(0, %3) \
+" stwcx. %0,0,%3\n" \
" bne- 1b\n" \
- PPC_ATOMIC_EXIT_BARRIER \
- : "=&r" (t) \
+ : "=&r" (t), "+m" (v->counter) \
: "r" (a), "r" (&v->counter) \
- : "cc", "memory"); \
+ : "cc"); \
\
return t; \
}
-#define ATOMIC_OPS(op, asm_op) ATOMIC_OP(op, asm_op) ATOMIC_OP_RETURN(op, asm_op)
+#define ATOMIC_OPS(op, asm_op) \
+ ATOMIC_OP(op, asm_op) \
+ ATOMIC_OP_RETURN_RELAXED(op, asm_op)
ATOMIC_OPS(add, add)
ATOMIC_OPS(sub, subf)
@@ -71,8 +89,11 @@ ATOMIC_OP(and, and)
ATOMIC_OP(or, or)
ATOMIC_OP(xor, xor)
+#define atomic_add_return_relaxed atomic_add_return_relaxed
+#define atomic_sub_return_relaxed atomic_sub_return_relaxed
+
#undef ATOMIC_OPS
-#undef ATOMIC_OP_RETURN
+#undef ATOMIC_OP_RETURN_RELAXED
#undef ATOMIC_OP
#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
@@ -92,21 +113,19 @@ static __inline__ void atomic_inc(atomic_t *v)
: "cc", "xer");
}
-static __inline__ int atomic_inc_return(atomic_t *v)
+static __inline__ int atomic_inc_return_relaxed(atomic_t *v)
{
int t;
__asm__ __volatile__(
- PPC_ATOMIC_ENTRY_BARRIER
-"1: lwarx %0,0,%1 # atomic_inc_return\n\
- addic %0,%0,1\n"
- PPC405_ERR77(0,%1)
-" stwcx. %0,0,%1 \n\
- bne- 1b"
- PPC_ATOMIC_EXIT_BARRIER
- : "=&r" (t)
+"1: lwarx %0,0,%2 # atomic_inc_return_relaxed\n"
+" addic %0,%0,1\n"
+ PPC405_ERR77(0, %2)
+" stwcx. %0,0,%2\n"
+" bne- 1b"
+ : "=&r" (t), "+m" (v->counter)
: "r" (&v->counter)
- : "cc", "xer", "memory");
+ : "cc", "xer");
return t;
}
@@ -136,25 +155,26 @@ static __inline__ void atomic_dec(atomic_t *v)
: "cc", "xer");
}
-static __inline__ int atomic_dec_return(atomic_t *v)
+static __inline__ int atomic_dec_return_relaxed(atomic_t *v)
{
int t;
__asm__ __volatile__(
- PPC_ATOMIC_ENTRY_BARRIER
-"1: lwarx %0,0,%1 # atomic_dec_return\n\
- addic %0,%0,-1\n"
- PPC405_ERR77(0,%1)
-" stwcx. %0,0,%1\n\
- bne- 1b"
- PPC_ATOMIC_EXIT_BARRIER
- : "=&r" (t)
+"1: lwarx %0,0,%2 # atomic_dec_return_relaxed\n"
+" addic %0,%0,-1\n"
+ PPC405_ERR77(0, %2)
+" stwcx. %0,0,%2\n"
+" bne- 1b"
+ : "=&r" (t), "+m" (v->counter)
: "r" (&v->counter)
- : "cc", "xer", "memory");
+ : "cc", "xer");
return t;
}
+#define atomic_inc_return_relaxed atomic_inc_return_relaxed
+#define atomic_dec_return_relaxed atomic_dec_return_relaxed
+
#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
@@ -285,26 +305,27 @@ static __inline__ void atomic64_##op(long a, atomic64_t *v) \
: "cc"); \
}
-#define ATOMIC64_OP_RETURN(op, asm_op) \
-static __inline__ long atomic64_##op##_return(long a, atomic64_t *v) \
+#define ATOMIC64_OP_RETURN_RELAXED(op, asm_op) \
+static inline long \
+atomic64_##op##_return_relaxed(long a, atomic64_t *v) \
{ \
long t; \
\
__asm__ __volatile__( \
- PPC_ATOMIC_ENTRY_BARRIER \
-"1: ldarx %0,0,%2 # atomic64_" #op "_return\n" \
- #asm_op " %0,%1,%0\n" \
-" stdcx. %0,0,%2 \n" \
+"1: ldarx %0,0,%3 # atomic64_" #op "_return_relaxed\n" \
+ #asm_op " %0,%2,%0\n" \
+" stdcx. %0,0,%3\n" \
" bne- 1b\n" \
- PPC_ATOMIC_EXIT_BARRIER \
- : "=&r" (t) \
+ : "=&r" (t), "+m" (v->counter) \
: "r" (a), "r" (&v->counter) \
- : "cc", "memory"); \
+ : "cc"); \
\
return t; \
}
-#define ATOMIC64_OPS(op, asm_op) ATOMIC64_OP(op, asm_op) ATOMIC64_OP_RETURN(op, asm_op)
+#define ATOMIC64_OPS(op, asm_op) \
+ ATOMIC64_OP(op, asm_op) \
+ ATOMIC64_OP_RETURN_RELAXED(op, asm_op)
ATOMIC64_OPS(add, add)
ATOMIC64_OPS(sub, subf)
@@ -312,8 +333,11 @@ ATOMIC64_OP(and, and)
ATOMIC64_OP(or, or)
ATOMIC64_OP(xor, xor)
-#undef ATOMIC64_OPS
-#undef ATOMIC64_OP_RETURN
+#define atomic64_add_return_relaxed atomic64_add_return_relaxed
+#define atomic64_sub_return_relaxed atomic64_sub_return_relaxed
+
+#undef ATOPIC64_OPS
+#undef ATOMIC64_OP_RETURN_RELAXED
#undef ATOMIC64_OP
#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
@@ -332,20 +356,18 @@ static __inline__ void atomic64_inc(atomic64_t *v)
: "cc", "xer");
}
-static __inline__ long atomic64_inc_return(atomic64_t *v)
+static __inline__ long atomic64_inc_return_relaxed(atomic64_t *v)
{
long t;
__asm__ __volatile__(
- PPC_ATOMIC_ENTRY_BARRIER
-"1: ldarx %0,0,%1 # atomic64_inc_return\n\
- addic %0,%0,1\n\
- stdcx. %0,0,%1 \n\
- bne- 1b"
- PPC_ATOMIC_EXIT_BARRIER
- : "=&r" (t)
+"1: ldarx %0,0,%2 # atomic64_inc_return_relaxed\n"
+" addic %0,%0,1\n"
+" stdcx. %0,0,%2\n"
+" bne- 1b"
+ : "=&r" (t), "+m" (v->counter)
: "r" (&v->counter)
- : "cc", "xer", "memory");
+ : "cc", "xer");
return t;
}
@@ -374,24 +396,25 @@ static __inline__ void atomic64_dec(atomic64_t *v)
: "cc", "xer");
}
-static __inline__ long atomic64_dec_return(atomic64_t *v)
+static __inline__ long atomic64_dec_return_relaxed(atomic64_t *v)
{
long t;
__asm__ __volatile__(
- PPC_ATOMIC_ENTRY_BARRIER
-"1: ldarx %0,0,%1 # atomic64_dec_return\n\
- addic %0,%0,-1\n\
- stdcx. %0,0,%1\n\
- bne- 1b"
- PPC_ATOMIC_EXIT_BARRIER
- : "=&r" (t)
+"1: ldarx %0,0,%2 # atomic64_dec_return_relaxed\n"
+" addic %0,%0,-1\n"
+" stdcx. %0,0,%2\n"
+" bne- 1b"
+ : "=&r" (t), "+m" (v->counter)
: "r" (&v->counter)
- : "cc", "xer", "memory");
+ : "cc", "xer");
return t;
}
+#define atomic64_inc_return_relaxed atomic64_inc_return_relaxed
+#define atomic64_dec_return_relaxed atomic64_dec_return_relaxed
+
#define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0)
#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)