Reviewed-by: Nicholas Piggin <npig...@gmail.com>
Signed-off-by: Madhavan Srinivasan <ma...@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/local.h | 201 +++++++++++++++++++++++++++++++++++++++
1 file changed, 201 insertions(+)
diff --git a/arch/powerpc/include/asm/local.h b/arch/powerpc/include/asm/local.h
index b8da91363864..7d117c07b0b1 100644
--- a/arch/powerpc/include/asm/local.h
+++ b/arch/powerpc/include/asm/local.h
@@ -3,6 +3,9 @@
#include <linux/percpu.h>
#include <linux/atomic.h>
+#include <linux/irqflags.h>
+
+#include <asm/hw_irq.h>
typedef struct
{
@@ -14,6 +17,202 @@ typedef struct
#define local_read(l) atomic_long_read(&(l)->a)
#define local_set(l,i) atomic_long_set(&(l)->a, (i))
+#ifdef CONFIG_PPC64
+
+static __inline__ void local_add(long i, local_t *l)
+{
+ long t;
+ unsigned long flags;
+
+ powerpc_local_irq_pmu_save(flags);
+ __asm__ __volatile__(
+ PPC_LL" %0,0(%2)\n\
+ add %0,%1,%0\n"
+ PPC_STL" %0,0(%2)\n"
+ : "=&r" (t)
+ : "r" (i), "r" (&(l->a.counter)));
+ powerpc_local_irq_pmu_restore(flags);
+}
+
+static __inline__ void local_sub(long i, local_t *l)
+{
+ long t;
+ unsigned long flags;
+
+ powerpc_local_irq_pmu_save(flags);
+ __asm__ __volatile__(
+ PPC_LL" %0,0(%2)\n\
+ subf %0,%1,%0\n"
+ PPC_STL" %0,0(%2)\n"
+ : "=&r" (t)
+ : "r" (i), "r" (&(l->a.counter)));
+ powerpc_local_irq_pmu_restore(flags);
+}
+
+static __inline__ long local_add_return(long a, local_t *l)
+{
+ long t;
+ unsigned long flags;
+
+ powerpc_local_irq_pmu_save(flags);
+ __asm__ __volatile__(
+ PPC_LL" %0,0(%2)\n\
+ add %0,%1,%0\n"
+ PPC_STL "%0,0(%2)\n"
+ : "=&r" (t)
+ : "r" (a), "r" (&(l->a.counter))
+ : "memory");
+ powerpc_local_irq_pmu_restore(flags);
+
+ return t;
+}
+
+#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
+
+static __inline__ long local_sub_return(long a, local_t *l)
+{
+ long t;
+ unsigned long flags;
+
+ powerpc_local_irq_pmu_save(flags);
+ __asm__ __volatile__(
+ PPC_LL" %0,0(%2)\n\
+ subf %0,%1,%0\n"
+ PPC_STL "%0,0(%2)\n"
+ : "=&r" (t)
+ : "r" (a), "r" (&(l->a.counter))
+ : "memory");
+ powerpc_local_irq_pmu_restore(flags);
+
+ return t;
+}
+
+static __inline__ long local_inc_return(local_t *l)
+{
+ long t;
+ unsigned long flags;
+
+ powerpc_local_irq_pmu_save(flags);
+ __asm__ __volatile__(
+ PPC_LL" %0,0(%1)\n\
+ addic %0,%0,1\n"
+ PPC_STL "%0,0(%1)\n"
+ : "=&r" (t)
+ : "r" (&(l->a.counter))
+ : "xer", "memory");
+ powerpc_local_irq_pmu_restore(flags);
+
+ return t;
+}
+
+/*
+ * local_inc_and_test - increment and test
+ * @l: pointer of type local_t
+ *
+ * Atomically increments @l by 1
+ * 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)
+
+static __inline__ long local_dec_return(local_t *l)
+{
+ long t;
+ unsigned long flags;
+
+ powerpc_local_irq_pmu_save(flags);
+ __asm__ __volatile__(
+ PPC_LL" %0,0(%1)\n\
+ addic %0,%0,-1\n"
+ PPC_STL "%0,0(%1)\n"
+ : "=&r" (t)
+ : "r" (&(l->a.counter))
+ : "xer", "memory");
+ powerpc_local_irq_pmu_restore(flags);
+
+ return t;
+}
+
+#define local_inc(l) local_inc_return(l)
+#define local_dec(l) local_dec_return(l)
+
+#define local_cmpxchg(l, o, n) \
+ (cmpxchg_local(&((l)->a.counter), (o), (n)))
+#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
+
+/**
+ * local_add_unless - add unless the number is a given value
+ * @l: pointer of type local_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @l, so long as it was not @u.
+ * Returns non-zero if @l was not @u, and zero otherwise.
+ */
+static __inline__ int local_add_unless(local_t *l, long a, long u)
+{
+ long t;
+ unsigned long flags;
+
+ powerpc_local_irq_pmu_save(flags);
+ __asm__ __volatile__ (
+ PPC_LL" %0,0(%1)\n\
+ cmpw 0,%0,%3 \n\
+ beq- 2f \n\
+ add %0,%2,%0 \n"
+ PPC_STL" %0,0(%1) \n"
+" subf %0,%2,%0 \n\
+2:"
+ : "=&r" (t)
+ : "r" (&(l->a.counter)), "r" (a), "r" (u)
+ : "cc", "memory");
+ powerpc_local_irq_pmu_restore(flags);
+
+ 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;
+
+ powerpc_local_irq_pmu_save(flags);
+ __asm__ __volatile__(
+ PPC_LL" %0,0(%1)\n\
+ cmpwi %0,1\n\
+ addi %0,%0,-1\n\
+ blt- 2f\n"
+ PPC_STL "%0,0(%1)\n"
+ "\n\
+2:" : "=&b" (t)
+ : "r" (&(l->a.counter))
+ : "cc", "memory");
+ powerpc_local_irq_pmu_restore(flags);
+
+ return t;
+}
+
+/* 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))
+
+#else
+
#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)
@@ -172,4 +371,6 @@ static __inline__ long local_dec_if_positive(local_t *l)
#define __local_add(i,l) ((l)->a.counter+=(i))
#define __local_sub(i,l) ((l)->a.counter-=(i))
+#endif /* CONFIG_PPC64 */
+
#endif /* _ARCH_POWERPC_LOCAL_H */
--
2.7.4
