mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
4c7c997886
This fixes up a typo in the ll/sc based cmpxchg code which apparently wasn't getting a lot of testing due to the swapped old/new pair. With that fixed up, the ll/sc code also starts using it and provides its own atomic_add_unless(). Signed-off-by: Aoi Shinkai <shinkoi2005@gmail.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
135 lines
2.7 KiB
C
135 lines
2.7 KiB
C
#ifndef __ASM_SH_ATOMIC_LLSC_H
|
|
#define __ASM_SH_ATOMIC_LLSC_H
|
|
|
|
/*
|
|
* To get proper branch prediction for the main line, we must branch
|
|
* forward to code at the end of this object's .text section, then
|
|
* branch back to restart the operation.
|
|
*/
|
|
static inline void atomic_add(int i, atomic_t *v)
|
|
{
|
|
unsigned long tmp;
|
|
|
|
__asm__ __volatile__ (
|
|
"1: movli.l @%2, %0 ! atomic_add \n"
|
|
" add %1, %0 \n"
|
|
" movco.l %0, @%2 \n"
|
|
" bf 1b \n"
|
|
: "=&z" (tmp)
|
|
: "r" (i), "r" (&v->counter)
|
|
: "t");
|
|
}
|
|
|
|
static inline void atomic_sub(int i, atomic_t *v)
|
|
{
|
|
unsigned long tmp;
|
|
|
|
__asm__ __volatile__ (
|
|
"1: movli.l @%2, %0 ! atomic_sub \n"
|
|
" sub %1, %0 \n"
|
|
" movco.l %0, @%2 \n"
|
|
" bf 1b \n"
|
|
: "=&z" (tmp)
|
|
: "r" (i), "r" (&v->counter)
|
|
: "t");
|
|
}
|
|
|
|
/*
|
|
* SH-4A note:
|
|
*
|
|
* We basically get atomic_xxx_return() for free compared with
|
|
* atomic_xxx(). movli.l/movco.l require r0 due to the instruction
|
|
* encoding, so the retval is automatically set without having to
|
|
* do any special work.
|
|
*/
|
|
static inline int atomic_add_return(int i, atomic_t *v)
|
|
{
|
|
unsigned long temp;
|
|
|
|
__asm__ __volatile__ (
|
|
"1: movli.l @%2, %0 ! atomic_add_return \n"
|
|
" add %1, %0 \n"
|
|
" movco.l %0, @%2 \n"
|
|
" bf 1b \n"
|
|
" synco \n"
|
|
: "=&z" (temp)
|
|
: "r" (i), "r" (&v->counter)
|
|
: "t");
|
|
|
|
return temp;
|
|
}
|
|
|
|
static inline int atomic_sub_return(int i, atomic_t *v)
|
|
{
|
|
unsigned long temp;
|
|
|
|
__asm__ __volatile__ (
|
|
"1: movli.l @%2, %0 ! atomic_sub_return \n"
|
|
" sub %1, %0 \n"
|
|
" movco.l %0, @%2 \n"
|
|
" bf 1b \n"
|
|
" synco \n"
|
|
: "=&z" (temp)
|
|
: "r" (i), "r" (&v->counter)
|
|
: "t");
|
|
|
|
return temp;
|
|
}
|
|
|
|
static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
|
|
{
|
|
unsigned long tmp;
|
|
|
|
__asm__ __volatile__ (
|
|
"1: movli.l @%2, %0 ! atomic_clear_mask \n"
|
|
" and %1, %0 \n"
|
|
" movco.l %0, @%2 \n"
|
|
" bf 1b \n"
|
|
: "=&z" (tmp)
|
|
: "r" (~mask), "r" (&v->counter)
|
|
: "t");
|
|
}
|
|
|
|
static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
|
|
{
|
|
unsigned long tmp;
|
|
|
|
__asm__ __volatile__ (
|
|
"1: movli.l @%2, %0 ! atomic_set_mask \n"
|
|
" or %1, %0 \n"
|
|
" movco.l %0, @%2 \n"
|
|
" bf 1b \n"
|
|
: "=&z" (tmp)
|
|
: "r" (mask), "r" (&v->counter)
|
|
: "t");
|
|
}
|
|
|
|
#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
|
|
|
|
/**
|
|
* atomic_add_unless - add unless the number is a given value
|
|
* @v: pointer of type atomic_t
|
|
* @a: the amount to add to v...
|
|
* @u: ...unless v is equal to u.
|
|
*
|
|
* Atomically adds @a to @v, so long as it was not @u.
|
|
* Returns non-zero if @v was not @u, and zero otherwise.
|
|
*/
|
|
static inline int atomic_add_unless(atomic_t *v, int a, int u)
|
|
{
|
|
int c, old;
|
|
c = atomic_read(v);
|
|
for (;;) {
|
|
if (unlikely(c == (u)))
|
|
break;
|
|
old = atomic_cmpxchg((v), c, c + (a));
|
|
if (likely(old == c))
|
|
break;
|
|
c = old;
|
|
}
|
|
|
|
return c != (u);
|
|
}
|
|
|
|
#endif /* __ASM_SH_ATOMIC_LLSC_H */
|