mirror of
https://github.com/torvalds/linux.git
synced 2024-11-26 22:21:42 +00:00
local_t: x86_64 extension
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mathieu Desnoyers
Linus Torvalds
parent
469b50b622
commit
c343c14aec
@ -2,49 +2,183 @@
|
||||
#define _ARCH_X8664_LOCAL_H
|
||||
|
||||
#include <linux/percpu.h>
|
||||
#include <asm/atomic.h>
|
||||
|
||||
typedef struct
|
||||
{
|
||||
volatile long counter;
|
||||
atomic_long_t a;
|
||||
} local_t;
|
||||
|
||||
#define LOCAL_INIT(i) { (i) }
|
||||
#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
|
||||
|
||||
#define local_read(v) ((v)->counter)
|
||||
#define local_set(v,i) (((v)->counter) = (i))
|
||||
#define local_read(l) atomic_long_read(&(l)->a)
|
||||
#define local_set(l,i) atomic_long_set(&(l)->a, (i))
|
||||
|
||||
static inline void local_inc(local_t *v)
|
||||
static inline void local_inc(local_t *l)
|
||||
{
|
||||
__asm__ __volatile__(
|
||||
"incq %0"
|
||||
:"=m" (v->counter)
|
||||
:"m" (v->counter));
|
||||
:"=m" (l->a.counter)
|
||||
:"m" (l->a.counter));
|
||||
}
|
||||
|
||||
static inline void local_dec(local_t *v)
|
||||
static inline void local_dec(local_t *l)
|
||||
{
|
||||
__asm__ __volatile__(
|
||||
"decq %0"
|
||||
:"=m" (v->counter)
|
||||
:"m" (v->counter));
|
||||
:"=m" (l->a.counter)
|
||||
:"m" (l->a.counter));
|
||||
}
|
||||
|
||||
static inline void local_add(long i, local_t *v)
|
||||
static inline void local_add(long i, local_t *l)
|
||||
{
|
||||
__asm__ __volatile__(
|
||||
"addq %1,%0"
|
||||
:"=m" (v->counter)
|
||||
:"ir" (i), "m" (v->counter));
|
||||
:"=m" (l->a.counter)
|
||||
:"ir" (i), "m" (l->a.counter));
|
||||
}
|
||||
|
||||
static inline void local_sub(long i, local_t *v)
|
||||
static inline void local_sub(long i, local_t *l)
|
||||
{
|
||||
__asm__ __volatile__(
|
||||
"subq %1,%0"
|
||||
:"=m" (v->counter)
|
||||
:"ir" (i), "m" (v->counter));
|
||||
:"=m" (l->a.counter)
|
||||
:"ir" (i), "m" (l->a.counter));
|
||||
}
|
||||
|
||||
/**
|
||||
* local_sub_and_test - subtract value from variable and test result
|
||||
* @i: integer value to subtract
|
||||
* @l: pointer to type local_t
|
||||
*
|
||||
* Atomically subtracts @i from @l and returns
|
||||
* true if the result is zero, or false for all
|
||||
* other cases.
|
||||
*/
|
||||
static __inline__ int local_sub_and_test(long i, local_t *l)
|
||||
{
|
||||
unsigned char c;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"subq %2,%0; sete %1"
|
||||
:"=m" (l->a.counter), "=qm" (c)
|
||||
:"ir" (i), "m" (l->a.counter) : "memory");
|
||||
return c;
|
||||
}
|
||||
|
||||
/**
|
||||
* local_dec_and_test - decrement and test
|
||||
* @l: pointer to type local_t
|
||||
*
|
||||
* Atomically decrements @l by 1 and
|
||||
* returns true if the result is 0, or false for all other
|
||||
* cases.
|
||||
*/
|
||||
static __inline__ int local_dec_and_test(local_t *l)
|
||||
{
|
||||
unsigned char c;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"decq %0; sete %1"
|
||||
:"=m" (l->a.counter), "=qm" (c)
|
||||
:"m" (l->a.counter) : "memory");
|
||||
return c != 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* local_inc_and_test - increment and test
|
||||
* @l: pointer to type local_t
|
||||
*
|
||||
* Atomically increments @l by 1
|
||||
* and returns true if the result is zero, or false for all
|
||||
* other cases.
|
||||
*/
|
||||
static __inline__ int local_inc_and_test(local_t *l)
|
||||
{
|
||||
unsigned char c;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"incq %0; sete %1"
|
||||
:"=m" (l->a.counter), "=qm" (c)
|
||||
:"m" (l->a.counter) : "memory");
|
||||
return c != 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* local_add_negative - add and test if negative
|
||||
* @i: integer value to add
|
||||
* @l: pointer to type local_t
|
||||
*
|
||||
* Atomically adds @i to @l and returns true
|
||||
* if the result is negative, or false when
|
||||
* result is greater than or equal to zero.
|
||||
*/
|
||||
static __inline__ int local_add_negative(long i, local_t *l)
|
||||
{
|
||||
unsigned char c;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"addq %2,%0; sets %1"
|
||||
:"=m" (l->a.counter), "=qm" (c)
|
||||
:"ir" (i), "m" (l->a.counter) : "memory");
|
||||
return c;
|
||||
}
|
||||
|
||||
/**
|
||||
* local_add_return - add and return
|
||||
* @i: integer value to add
|
||||
* @l: pointer to type local_t
|
||||
*
|
||||
* Atomically adds @i to @l and returns @i + @l
|
||||
*/
|
||||
static __inline__ long local_add_return(long i, local_t *l)
|
||||
{
|
||||
long __i = i;
|
||||
__asm__ __volatile__(
|
||||
"xaddq %0, %1;"
|
||||
:"+r" (i), "+m" (l->a.counter)
|
||||
: : "memory");
|
||||
return i + __i;
|
||||
}
|
||||
|
||||
static __inline__ long local_sub_return(long i, local_t *l)
|
||||
{
|
||||
return local_add_return(-i,l);
|
||||
}
|
||||
|
||||
#define local_inc_return(l) (local_add_return(1,l))
|
||||
#define local_dec_return(l) (local_sub_return(1,l))
|
||||
|
||||
#define local_cmpxchg(l, o, n) \
|
||||
(cmpxchg_local(&((l)->a.counter), (o), (n)))
|
||||
/* Always has a lock prefix */
|
||||
#define local_xchg(l, n) (xchg(&((l)->a.counter), (n)))
|
||||
|
||||
/**
|
||||
* atomic_up_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); \
|
||||
for (;;) { \
|
||||
if (unlikely(c == (u))) \
|
||||
break; \
|
||||
old = local_cmpxchg((l), c, c + (a)); \
|
||||
if (likely(old == c)) \
|
||||
break; \
|
||||
c = old; \
|
||||
} \
|
||||
c != (u); \
|
||||
})
|
||||
#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
|
||||
|
||||
/* On x86-64 these are better than the atomic variants on SMP kernels
|
||||
because they dont use a lock prefix. */
|
||||
#define __local_inc(l) local_inc(l)
|
||||
@ -62,27 +196,27 @@ static inline void local_sub(long i, local_t *v)
|
||||
|
||||
/* Need to disable preemption for the cpu local counters otherwise we could
|
||||
still access a variable of a previous CPU in a non atomic way. */
|
||||
#define cpu_local_wrap_v(v) \
|
||||
#define cpu_local_wrap_v(l) \
|
||||
({ local_t res__; \
|
||||
preempt_disable(); \
|
||||
res__ = (v); \
|
||||
res__ = (l); \
|
||||
preempt_enable(); \
|
||||
res__; })
|
||||
#define cpu_local_wrap(v) \
|
||||
#define cpu_local_wrap(l) \
|
||||
({ preempt_disable(); \
|
||||
v; \
|
||||
l; \
|
||||
preempt_enable(); }) \
|
||||
|
||||
#define cpu_local_read(v) cpu_local_wrap_v(local_read(&__get_cpu_var(v)))
|
||||
#define cpu_local_set(v, i) cpu_local_wrap(local_set(&__get_cpu_var(v), (i)))
|
||||
#define cpu_local_inc(v) cpu_local_wrap(local_inc(&__get_cpu_var(v)))
|
||||
#define cpu_local_dec(v) cpu_local_wrap(local_dec(&__get_cpu_var(v)))
|
||||
#define cpu_local_add(i, v) cpu_local_wrap(local_add((i), &__get_cpu_var(v)))
|
||||
#define cpu_local_sub(i, v) cpu_local_wrap(local_sub((i), &__get_cpu_var(v)))
|
||||
#define cpu_local_read(l) cpu_local_wrap_v(local_read(&__get_cpu_var(l)))
|
||||
#define cpu_local_set(l, i) cpu_local_wrap(local_set(&__get_cpu_var(l), (i)))
|
||||
#define cpu_local_inc(l) cpu_local_wrap(local_inc(&__get_cpu_var(l)))
|
||||
#define cpu_local_dec(l) cpu_local_wrap(local_dec(&__get_cpu_var(l)))
|
||||
#define cpu_local_add(i, l) cpu_local_wrap(local_add((i), &__get_cpu_var(l)))
|
||||
#define cpu_local_sub(i, l) cpu_local_wrap(local_sub((i), &__get_cpu_var(l)))
|
||||
|
||||
#define __cpu_local_inc(v) cpu_local_inc(v)
|
||||
#define __cpu_local_dec(v) cpu_local_dec(v)
|
||||
#define __cpu_local_add(i, v) cpu_local_add((i), (v))
|
||||
#define __cpu_local_sub(i, v) cpu_local_sub((i), (v))
|
||||
#define __cpu_local_inc(l) cpu_local_inc(l)
|
||||
#define __cpu_local_dec(l) cpu_local_dec(l)
|
||||
#define __cpu_local_add(i, l) cpu_local_add((i), (l))
|
||||
#define __cpu_local_sub(i, l) cpu_local_sub((i), (l))
|
||||
|
||||
#endif /* _ARCH_I386_LOCAL_H */
|
||||
#endif /* _ARCH_X8664_LOCAL_H */
|
||||
|
||||
@ -214,9 +214,45 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
|
||||
return old;
|
||||
}
|
||||
|
||||
static inline unsigned long __cmpxchg_local(volatile void *ptr,
|
||||
unsigned long old, unsigned long new, int size)
|
||||
{
|
||||
unsigned long prev;
|
||||
switch (size) {
|
||||
case 1:
|
||||
__asm__ __volatile__("cmpxchgb %b1,%2"
|
||||
: "=a"(prev)
|
||||
: "q"(new), "m"(*__xg(ptr)), "0"(old)
|
||||
: "memory");
|
||||
return prev;
|
||||
case 2:
|
||||
__asm__ __volatile__("cmpxchgw %w1,%2"
|
||||
: "=a"(prev)
|
||||
: "r"(new), "m"(*__xg(ptr)), "0"(old)
|
||||
: "memory");
|
||||
return prev;
|
||||
case 4:
|
||||
__asm__ __volatile__("cmpxchgl %k1,%2"
|
||||
: "=a"(prev)
|
||||
: "r"(new), "m"(*__xg(ptr)), "0"(old)
|
||||
: "memory");
|
||||
return prev;
|
||||
case 8:
|
||||
__asm__ __volatile__("cmpxchgq %1,%2"
|
||||
: "=a"(prev)
|
||||
: "r"(new), "m"(*__xg(ptr)), "0"(old)
|
||||
: "memory");
|
||||
return prev;
|
||||
}
|
||||
return old;
|
||||
}
|
||||
|
||||
#define cmpxchg(ptr,o,n)\
|
||||
((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
|
||||
(unsigned long)(n),sizeof(*(ptr))))
|
||||
#define cmpxchg_local(ptr,o,n)\
|
||||
((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
|
||||
(unsigned long)(n),sizeof(*(ptr))))
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
#define smp_mb() mb()
|
||||
|
||||
Loading…
Reference in New Issue
Block a user