138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/* 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;
|
|
}
|
|
|
|
#define local_cmpxchg(l, o, n) \
|
|
((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
|
|
#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
|
|
|
|
/**
|
|
* local_add_unless - add unless the number is 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, so long as it was not @u.
|
|
* Returns non-zero if @l was not @u, and zero otherwise.
|
|
*/
|
|
#define local_add_unless(l, a, u) \
|
|
({ \
|
|
long c, old; \
|
|
c = local_read(l); \
|
|
while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
|
|
c = old; \
|
|
c != (u); \
|
|
})
|
|
#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 */
|