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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ARCH_LOONGARCH_LOCAL_H
#define _ARCH_LOONGARCH_LOCAL_H
#include <linux/percpu.h>
#include <linux/bitops.h>
#include <linux/atomic.h>
#include <asm/cmpxchg.h>
typedef struct {
atomic_long_t a;
} 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_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)
/*
* Same as above, but return the result value
*/
static inline long local_add_return(long i, local_t *l)
{
unsigned long result;
__asm__ __volatile__(
" " __AMADD " %1, %2, %0 \n"
: "+ZB" (l->a.counter), "=&r" (result)
: "r" (i)
: "memory");
result = result + i;
return result;
}
static inline long local_sub_return(long i, local_t *l)
{
unsigned long result;
__asm__ __volatile__(
" " __AMADD "%1, %2, %0 \n"
: "+ZB" (l->a.counter), "=&r" (result)
: "r" (-i)
: "memory");
result = result - i;
return result;
}
static inline long local_cmpxchg(local_t *l, long old, long new)
{
return cmpxchg_local(&l->a.counter, old, new);
}
static inline bool local_try_cmpxchg(local_t *l, long *old, long new)
{
return try_cmpxchg_local(&l->a.counter,
(typeof(l->a.counter) *) old, new);
}
#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
/**
* local_add_unless - add unless the number is already a given value
* @l: pointer of type local_t
* @a: the amount to add to l...
* @u: ...unless l 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)
{
long c = local_read(l);
do {
if (unlikely(c == u))
return false;
} while (!local_try_cmpxchg(l, &c, c + a));
return true;
}
#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
#define local_dec_return(l) local_sub_return(1, (l))
#define local_inc_return(l) local_add_return(1, (l))
/*
* local_sub_and_test - subtract value from variable and test result
* @i: integer value to subtract
* @l: pointer of type local_t
*
* Atomically subtracts @i from @l and returns
* true if the result is zero, or false for all
* other cases.
*/
#define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
/*
* 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)
/*
* local_dec_and_test - decrement by 1 and test
* @l: pointer of type local_t
*
* Atomically decrements @l by 1 and
* returns true if the result is 0, or false for all other
* cases.
*/
#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
/*
* local_add_negative - add and test if negative
* @l: pointer of type local_t
* @i: integer value to add
*
* Atomically adds @i to @l and returns true
* if the result is negative, or false when
* result is greater than or equal to zero.
*/
#define local_add_negative(i, l) (local_add_return(i, (l)) < 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))
#endif /* _ARCH_LOONGARCH_LOCAL_H */
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