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local_t: i386 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
f43f7b46eb
commit
a075227948
2 changed files with 235 additions and 27 deletions
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@ -2,47 +2,198 @@
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#define _ARCH_I386_LOCAL_H
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#include <linux/percpu.h>
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#include <asm/system.h>
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#include <asm/atomic.h>
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typedef struct
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{
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volatile long counter;
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atomic_long_t a;
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} local_t;
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#define LOCAL_INIT(i) { (i) }
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#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
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#define local_read(v) ((v)->counter)
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#define local_set(v,i) (((v)->counter) = (i))
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#define local_read(l) atomic_long_read(&(l)->a)
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#define local_set(l,i) atomic_long_set(&(l)->a, (i))
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static __inline__ void local_inc(local_t *v)
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static __inline__ void local_inc(local_t *l)
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{
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__asm__ __volatile__(
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"incl %0"
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:"+m" (v->counter));
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:"+m" (l->a.counter));
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}
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static __inline__ void local_dec(local_t *v)
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static __inline__ void local_dec(local_t *l)
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{
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__asm__ __volatile__(
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"decl %0"
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:"+m" (v->counter));
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:"+m" (l->a.counter));
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}
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static __inline__ void local_add(long i, local_t *v)
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static __inline__ void local_add(long i, local_t *l)
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{
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__asm__ __volatile__(
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"addl %1,%0"
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:"+m" (v->counter)
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:"+m" (l->a.counter)
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:"ir" (i));
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}
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static __inline__ void local_sub(long i, local_t *v)
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static __inline__ void local_sub(long i, local_t *l)
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{
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__asm__ __volatile__(
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"subl %1,%0"
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:"+m" (v->counter)
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:"+m" (l->a.counter)
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:"ir" (i));
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}
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/**
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* local_sub_and_test - subtract value from variable and test result
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* @i: integer value to subtract
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* @l: pointer of type local_t
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*
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* Atomically subtracts @i from @l and returns
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* true if the result is zero, or false for all
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* other cases.
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*/
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static __inline__ int local_sub_and_test(long i, local_t *l)
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{
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unsigned char c;
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__asm__ __volatile__(
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"subl %2,%0; sete %1"
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:"+m" (l->a.counter), "=qm" (c)
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:"ir" (i) : "memory");
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return c;
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}
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/**
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* local_dec_and_test - decrement and test
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* @l: pointer of type local_t
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*
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* Atomically decrements @l by 1 and
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* returns true if the result is 0, or false for all other
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* cases.
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*/
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static __inline__ int local_dec_and_test(local_t *l)
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{
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unsigned char c;
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__asm__ __volatile__(
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"decl %0; sete %1"
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:"+m" (l->a.counter), "=qm" (c)
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: : "memory");
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return c != 0;
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}
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/**
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* local_inc_and_test - increment and test
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* @l: pointer of type local_t
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*
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* Atomically increments @l by 1
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* and returns true if the result is zero, or false for all
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* other cases.
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*/
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static __inline__ int local_inc_and_test(local_t *l)
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{
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unsigned char c;
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__asm__ __volatile__(
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"incl %0; sete %1"
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:"+m" (l->a.counter), "=qm" (c)
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: : "memory");
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return c != 0;
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}
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/**
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* local_add_negative - add and test if negative
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* @l: pointer of type local_t
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* @i: integer value to add
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*
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* Atomically adds @i to @l and returns true
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* if the result is negative, or false when
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* result is greater than or equal to zero.
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*/
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static __inline__ int local_add_negative(long i, local_t *l)
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{
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unsigned char c;
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__asm__ __volatile__(
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"addl %2,%0; sets %1"
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:"+m" (l->a.counter), "=qm" (c)
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:"ir" (i) : "memory");
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return c;
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}
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/**
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* local_add_return - add and return
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* @l: pointer of type local_t
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* @i: integer value to add
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*
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* Atomically adds @i to @l and returns @i + @l
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*/
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static __inline__ long local_add_return(long i, local_t *l)
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{
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long __i;
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#ifdef CONFIG_M386
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unsigned long flags;
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if(unlikely(boot_cpu_data.x86==3))
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goto no_xadd;
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#endif
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/* Modern 486+ processor */
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__i = i;
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__asm__ __volatile__(
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"xaddl %0, %1;"
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:"+r" (i), "+m" (l->a.counter)
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: : "memory");
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return i + __i;
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#ifdef CONFIG_M386
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no_xadd: /* Legacy 386 processor */
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local_irq_save(flags);
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__i = local_read(l);
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local_set(l, i + __i);
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local_irq_restore(flags);
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return i + __i;
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#endif
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}
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static __inline__ long local_sub_return(long i, local_t *l)
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{
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return local_add_return(-i,l);
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}
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#define local_inc_return(l) (local_add_return(1,l))
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#define local_dec_return(l) (local_sub_return(1,l))
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#define local_cmpxchg(l, o, n) \
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(cmpxchg_local(&((l)->a.counter), (o), (n)))
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/* Always has a lock prefix */
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#define local_xchg(l, n) (xchg(&((l)->a.counter), (n)))
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/**
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* local_add_unless - add unless the number is a given value
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* @l: pointer of type local_t
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* @a: the amount to add to l...
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* @u: ...unless l is equal to u.
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*
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* Atomically adds @a to @l, so long as it was not @u.
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* Returns non-zero if @l was not @u, and zero otherwise.
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*/
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#define local_add_unless(l, a, u) \
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({ \
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long c, old; \
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c = local_read(l); \
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for (;;) { \
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if (unlikely(c == (u))) \
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break; \
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old = local_cmpxchg((l), c, c + (a)); \
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if (likely(old == c)) \
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break; \
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c = old; \
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} \
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c != (u); \
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})
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#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
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/* On x86, these are no better than the atomic variants. */
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#define __local_inc(l) local_inc(l)
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#define __local_dec(l) local_dec(l)
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@ -56,27 +207,27 @@ static __inline__ void local_sub(long i, local_t *v)
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/* Need to disable preemption for the cpu local counters otherwise we could
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still access a variable of a previous CPU in a non atomic way. */
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#define cpu_local_wrap_v(v) \
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#define cpu_local_wrap_v(l) \
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({ local_t res__; \
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preempt_disable(); \
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res__ = (v); \
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res__ = (l); \
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preempt_enable(); \
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res__; })
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#define cpu_local_wrap(v) \
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#define cpu_local_wrap(l) \
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({ preempt_disable(); \
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v; \
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l; \
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preempt_enable(); }) \
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#define cpu_local_read(v) cpu_local_wrap_v(local_read(&__get_cpu_var(v)))
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#define cpu_local_set(v, i) cpu_local_wrap(local_set(&__get_cpu_var(v), (i)))
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#define cpu_local_inc(v) cpu_local_wrap(local_inc(&__get_cpu_var(v)))
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#define cpu_local_dec(v) cpu_local_wrap(local_dec(&__get_cpu_var(v)))
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#define cpu_local_add(i, v) cpu_local_wrap(local_add((i), &__get_cpu_var(v)))
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#define cpu_local_sub(i, v) cpu_local_wrap(local_sub((i), &__get_cpu_var(v)))
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#define cpu_local_read(l) cpu_local_wrap_v(local_read(&__get_cpu_var(l)))
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#define cpu_local_set(l, i) cpu_local_wrap(local_set(&__get_cpu_var(l), (i)))
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#define cpu_local_inc(l) cpu_local_wrap(local_inc(&__get_cpu_var(l)))
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#define cpu_local_dec(l) cpu_local_wrap(local_dec(&__get_cpu_var(l)))
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#define cpu_local_add(i, l) cpu_local_wrap(local_add((i), &__get_cpu_var(l)))
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#define cpu_local_sub(i, l) cpu_local_wrap(local_sub((i), &__get_cpu_var(l)))
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#define __cpu_local_inc(v) cpu_local_inc(v)
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#define __cpu_local_dec(v) cpu_local_dec(v)
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#define __cpu_local_add(i, v) cpu_local_add((i), (v))
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#define __cpu_local_sub(i, v) cpu_local_sub((i), (v))
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#define __cpu_local_inc(l) cpu_local_inc(l)
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#define __cpu_local_dec(l) cpu_local_dec(l)
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#define __cpu_local_add(i, l) cpu_local_add((i), (l))
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#define __cpu_local_sub(i, l) cpu_local_sub((i), (l))
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#endif /* _ARCH_I386_LOCAL_H */
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@ -305,6 +305,9 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz
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#define sync_cmpxchg(ptr,o,n)\
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((__typeof__(*(ptr)))__sync_cmpxchg((ptr),(unsigned long)(o),\
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(unsigned long)(n),sizeof(*(ptr))))
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#define cmpxchg_local(ptr,o,n)\
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((__typeof__(*(ptr)))__cmpxchg_local((ptr),(unsigned long)(o),\
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(unsigned long)(n),sizeof(*(ptr))))
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#endif
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static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
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@ -367,6 +370,33 @@ static inline unsigned long __sync_cmpxchg(volatile void *ptr,
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return old;
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}
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static inline unsigned long __cmpxchg_local(volatile void *ptr,
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unsigned long old, unsigned long new, int size)
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{
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unsigned long prev;
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switch (size) {
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case 1:
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__asm__ __volatile__("cmpxchgb %b1,%2"
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: "=a"(prev)
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: "q"(new), "m"(*__xg(ptr)), "0"(old)
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: "memory");
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return prev;
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case 2:
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__asm__ __volatile__("cmpxchgw %w1,%2"
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: "=a"(prev)
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: "r"(new), "m"(*__xg(ptr)), "0"(old)
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: "memory");
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return prev;
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case 4:
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__asm__ __volatile__("cmpxchgl %1,%2"
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: "=a"(prev)
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: "r"(new), "m"(*__xg(ptr)), "0"(old)
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: "memory");
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return prev;
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}
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return old;
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}
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#ifndef CONFIG_X86_CMPXCHG
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/*
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* Building a kernel capable running on 80386. It may be necessary to
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@ -403,6 +433,17 @@ static inline unsigned long cmpxchg_386(volatile void *ptr, unsigned long old,
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(unsigned long)(n), sizeof(*(ptr))); \
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__ret; \
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})
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#define cmpxchg_local(ptr,o,n) \
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({ \
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__typeof__(*(ptr)) __ret; \
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if (likely(boot_cpu_data.x86 > 3)) \
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__ret = __cmpxchg_local((ptr), (unsigned long)(o), \
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(unsigned long)(n), sizeof(*(ptr))); \
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else \
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__ret = cmpxchg_386((ptr), (unsigned long)(o), \
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(unsigned long)(n), sizeof(*(ptr))); \
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__ret; \
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})
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#endif
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#ifdef CONFIG_X86_CMPXCHG64
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@ -421,10 +462,26 @@ static inline unsigned long long __cmpxchg64(volatile void *ptr, unsigned long l
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return prev;
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}
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static inline unsigned long long __cmpxchg64_local(volatile void *ptr,
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unsigned long long old, unsigned long long new)
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{
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unsigned long long prev;
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__asm__ __volatile__("cmpxchg8b %3"
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: "=A"(prev)
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: "b"((unsigned long)new),
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"c"((unsigned long)(new >> 32)),
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"m"(*__xg(ptr)),
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"0"(old)
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: "memory");
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return prev;
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}
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#define cmpxchg64(ptr,o,n)\
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((__typeof__(*(ptr)))__cmpxchg64((ptr),(unsigned long long)(o),\
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(unsigned long long)(n)))
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#define cmpxchg64_local(ptr,o,n)\
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((__typeof__(*(ptr)))__cmpxchg64_local((ptr),(unsigned long long)(o),\
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(unsigned long long)(n)))
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#endif
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/*
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