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Diffstat (limited to 'arch/powerpc/include/asm/local.h')
-rw-r--r--arch/powerpc/include/asm/local.h200
1 files changed, 86 insertions, 114 deletions
diff --git a/arch/powerpc/include/asm/local.h b/arch/powerpc/include/asm/local.h
index 600a68bd77f5..fdd00939270b 100644
--- a/arch/powerpc/include/asm/local.h
+++ b/arch/powerpc/include/asm/local.h
@@ -2,76 +2,64 @@
#ifndef _ARCH_POWERPC_LOCAL_H
#define _ARCH_POWERPC_LOCAL_H
+#ifdef CONFIG_PPC_BOOK3S_64
+
#include <linux/percpu.h>
#include <linux/atomic.h>
+#include <linux/irqflags.h>
+
+#include <asm/hw_irq.h>
typedef struct
{
- atomic_long_t a;
+ long v;
} local_t;
-#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
-
-#define local_read(l) atomic_long_read(&(l)->a)
-#define local_set(l,i) atomic_long_set(&(l)->a, (i))
+#define LOCAL_INIT(i) { (i) }
-#define local_add(i,l) atomic_long_add((i),(&(l)->a))
-#define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
-#define local_inc(l) atomic_long_inc(&(l)->a)
-#define local_dec(l) atomic_long_dec(&(l)->a)
-
-static __inline__ long local_add_return(long a, local_t *l)
+static __inline__ long local_read(local_t *l)
{
- long t;
-
- __asm__ __volatile__(
-"1:" PPC_LLARX(%0,0,%2,0) " # local_add_return\n\
- add %0,%1,%0\n"
- PPC405_ERR77(0,%2)
- PPC_STLCX "%0,0,%2 \n\
- bne- 1b"
- : "=&r" (t)
- : "r" (a), "r" (&(l->a.counter))
- : "cc", "memory");
-
- return t;
+ return READ_ONCE(l->v);
}
-#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
-
-static __inline__ long local_sub_return(long a, local_t *l)
+static __inline__ void local_set(local_t *l, long i)
{
- long t;
+ WRITE_ONCE(l->v, i);
+}
- __asm__ __volatile__(
-"1:" PPC_LLARX(%0,0,%2,0) " # local_sub_return\n\
- subf %0,%1,%0\n"
- PPC405_ERR77(0,%2)
- PPC_STLCX "%0,0,%2 \n\
- bne- 1b"
- : "=&r" (t)
- : "r" (a), "r" (&(l->a.counter))
- : "cc", "memory");
+#define LOCAL_OP(op, c_op) \
+static __inline__ void local_##op(long i, local_t *l) \
+{ \
+ unsigned long flags; \
+ \
+ powerpc_local_irq_pmu_save(flags); \
+ l->v c_op i; \
+ powerpc_local_irq_pmu_restore(flags); \
+}
- return t;
+#define LOCAL_OP_RETURN(op, c_op) \
+static __inline__ long local_##op##_return(long a, local_t *l) \
+{ \
+ long t; \
+ unsigned long flags; \
+ \
+ powerpc_local_irq_pmu_save(flags); \
+ t = (l->v c_op a); \
+ powerpc_local_irq_pmu_restore(flags); \
+ \
+ return t; \
}
-static __inline__ long local_inc_return(local_t *l)
-{
- long t;
+#define LOCAL_OPS(op, c_op) \
+ LOCAL_OP(op, c_op) \
+ LOCAL_OP_RETURN(op, c_op)
- __asm__ __volatile__(
-"1:" PPC_LLARX(%0,0,%1,0) " # local_inc_return\n\
- addic %0,%0,1\n"
- PPC405_ERR77(0,%1)
- PPC_STLCX "%0,0,%1 \n\
- bne- 1b"
- : "=&r" (t)
- : "r" (&(l->a.counter))
- : "cc", "xer", "memory");
+LOCAL_OPS(add, +=)
+LOCAL_OPS(sub, -=)
- return t;
-}
+#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
+#define local_inc_return(l) local_add_return(1LL, l)
+#define local_inc(l) local_inc_return(l)
/*
* local_inc_and_test - increment and test
@@ -81,28 +69,39 @@ static __inline__ long local_inc_return(local_t *l)
* and returns true if the result is zero, or false for all
* other cases.
*/
-#define local_inc_and_test(l) (local_inc_return(l) == 0)
+#define local_inc_and_test(l) (local_inc_return(l) == 0)
-static __inline__ long local_dec_return(local_t *l)
+#define local_dec_return(l) local_sub_return(1LL, l)
+#define local_dec(l) local_dec_return(l)
+#define local_sub_and_test(a, l) (local_sub_return((a), (l)) == 0)
+#define local_dec_and_test(l) (local_dec_return((l)) == 0)
+
+static __inline__ long local_cmpxchg(local_t *l, long o, long n)
{
long t;
+ unsigned long flags;
- __asm__ __volatile__(
-"1:" PPC_LLARX(%0,0,%1,0) " # local_dec_return\n\
- addic %0,%0,-1\n"
- PPC405_ERR77(0,%1)
- PPC_STLCX "%0,0,%1\n\
- bne- 1b"
- : "=&r" (t)
- : "r" (&(l->a.counter))
- : "cc", "xer", "memory");
+ powerpc_local_irq_pmu_save(flags);
+ t = l->v;
+ if (t == o)
+ l->v = n;
+ powerpc_local_irq_pmu_restore(flags);
return t;
}
-#define local_cmpxchg(l, o, n) \
- (cmpxchg_local(&((l)->a.counter), (o), (n)))
-#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
+static __inline__ long local_xchg(local_t *l, long n)
+{
+ long t;
+ unsigned long flags;
+
+ powerpc_local_irq_pmu_save(flags);
+ t = l->v;
+ l->v = n;
+ powerpc_local_irq_pmu_restore(flags);
+
+ return t;
+}
/**
* local_add_unless - add unless the number is a given value
@@ -115,62 +114,35 @@ static __inline__ long local_dec_return(local_t *l)
*/
static __inline__ int local_add_unless(local_t *l, long a, long u)
{
- long t;
-
- __asm__ __volatile__ (
-"1:" PPC_LLARX(%0,0,%1,0) " # local_add_unless\n\
- cmpw 0,%0,%3 \n\
- beq- 2f \n\
- add %0,%2,%0 \n"
- PPC405_ERR77(0,%2)
- PPC_STLCX "%0,0,%1 \n\
- bne- 1b \n"
-" subf %0,%2,%0 \n\
-2:"
- : "=&r" (t)
- : "r" (&(l->a.counter)), "r" (a), "r" (u)
- : "cc", "memory");
-
- return t != u;
-}
-
-#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
-
-#define local_sub_and_test(a, l) (local_sub_return((a), (l)) == 0)
-#define local_dec_and_test(l) (local_dec_return((l)) == 0)
-
-/*
- * Atomically test *l and decrement if it is greater than 0.
- * The function returns the old value of *l minus 1.
- */
-static __inline__ long local_dec_if_positive(local_t *l)
-{
- long t;
+ unsigned long flags;
+ int ret = 0;
- __asm__ __volatile__(
-"1:" PPC_LLARX(%0,0,%1,0) " # local_dec_if_positive\n\
- cmpwi %0,1\n\
- addi %0,%0,-1\n\
- blt- 2f\n"
- PPC405_ERR77(0,%1)
- PPC_STLCX "%0,0,%1\n\
- bne- 1b"
- "\n\
-2:" : "=&b" (t)
- : "r" (&(l->a.counter))
- : "cc", "memory");
+ powerpc_local_irq_pmu_save(flags);
+ if (l->v != u) {
+ l->v += a;
+ ret = 1;
+ }
+ powerpc_local_irq_pmu_restore(flags);
- return t;
+ return ret;
}
+#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
+
/* Use these for per-cpu local_t variables: on some archs they are
* much more efficient than these naive implementations. Note they take
* a variable, not an address.
*/
-#define __local_inc(l) ((l)->a.counter++)
-#define __local_dec(l) ((l)->a.counter++)
-#define __local_add(i,l) ((l)->a.counter+=(i))
-#define __local_sub(i,l) ((l)->a.counter-=(i))
+#define __local_inc(l) ((l)->v++)
+#define __local_dec(l) ((l)->v++)
+#define __local_add(i,l) ((l)->v+=(i))
+#define __local_sub(i,l) ((l)->v-=(i))
+
+#else /* CONFIG_PPC64 */
+
+#include <asm-generic/local.h>
+
+#endif /* CONFIG_PPC64 */
#endif /* _ARCH_POWERPC_LOCAL_H */