160 lines
3.4 KiB
C
160 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#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
|
|
{
|
|
long v;
|
|
} local_t;
|
|
|
|
#define LOCAL_INIT(i) { (i) }
|
|
|
|
static __inline__ long local_read(const local_t *l)
|
|
{
|
|
return READ_ONCE(l->v);
|
|
}
|
|
|
|
static __inline__ void local_set(local_t *l, long i)
|
|
{
|
|
WRITE_ONCE(l->v, i);
|
|
}
|
|
|
|
#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); \
|
|
}
|
|
|
|
#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; \
|
|
}
|
|
|
|
#define LOCAL_OPS(op, c_op) \
|
|
LOCAL_OP(op, c_op) \
|
|
LOCAL_OP_RETURN(op, c_op)
|
|
|
|
LOCAL_OPS(add, +=)
|
|
LOCAL_OPS(sub, -=)
|
|
|
|
#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
|
|
* @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)
|
|
|
|
#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;
|
|
|
|
powerpc_local_irq_pmu_save(flags);
|
|
t = l->v;
|
|
if (t == o)
|
|
l->v = n;
|
|
powerpc_local_irq_pmu_restore(flags);
|
|
|
|
return t;
|
|
}
|
|
|
|
static __inline__ bool local_try_cmpxchg(local_t *l, long *po, long n)
|
|
{
|
|
long o = *po, r;
|
|
|
|
r = local_cmpxchg(l, o, n);
|
|
if (unlikely(r != o))
|
|
*po = r;
|
|
|
|
return likely(r == o);
|
|
}
|
|
|
|
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 already 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, if @v was not already @u.
|
|
* Returns true if the addition was done.
|
|
*/
|
|
static __inline__ bool local_add_unless(local_t *l, long a, long u)
|
|
{
|
|
unsigned long flags;
|
|
bool ret = false;
|
|
|
|
powerpc_local_irq_pmu_save(flags);
|
|
if (l->v != u) {
|
|
l->v += a;
|
|
ret = true;
|
|
}
|
|
powerpc_local_irq_pmu_restore(flags);
|
|
|
|
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)->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 */
|