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Commit 7232311e authored by Mathieu Desnoyers's avatar Mathieu Desnoyers Committed by Linus Torvalds
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local_t: mips extension



Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4431f46f
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+266 −38
Original line number Original line Diff line number Diff line
#ifndef _ASM_LOCAL_H
#ifndef _ARCH_MIPS_LOCAL_H
#define _ASM_LOCAL_H
#define _ARCH_MIPS_LOCAL_H


#include <linux/percpu.h>
#include <linux/percpu.h>
#include <linux/bitops.h>
#include <asm/atomic.h>
#include <asm/atomic.h>
#include <asm/war.h>


#ifdef CONFIG_32BIT
typedef struct
{
	atomic_long_t a;
} local_t;


typedef atomic_t local_t;
#define LOCAL_INIT(i)	{ ATOMIC_LONG_INIT(i) }


#define LOCAL_INIT(i)	ATOMIC_INIT(i)
#define local_read(l)	atomic_long_read(&(l)->a)
#define local_read(v)	atomic_read(v)
#define local_set(l,i)	atomic_long_set(&(l)->a, (i))
#define local_set(v,i)	atomic_set(v,i)


#define local_inc(v)	atomic_inc(v)
#define local_add(i,l)	atomic_long_add((i),(&(l)->a))
#define local_dec(v)	atomic_dec(v)
#define local_sub(i,l)	atomic_long_sub((i),(&(l)->a))
#define local_add(i, v)	atomic_add(i, v)
#define local_inc(l)	atomic_long_inc(&(l)->a)
#define local_sub(i, v)	atomic_sub(i, v)
#define local_dec(l)	atomic_long_dec(&(l)->a)


#endif
/*
 * Same as above, but return the result value
 */
static __inline__ long local_add_return(long i, local_t * l)
{
	unsigned long result;

	if (cpu_has_llsc && R10000_LLSC_WAR) {
		unsigned long temp;

		__asm__ __volatile__(
		"	.set	mips3					\n"
		"1:"	__LL	"%1, %2		# local_add_return	\n"
		"	addu	%0, %1, %3				\n"
			__SC	"%0, %2					\n"
		"	beqzl	%0, 1b					\n"
		"	addu	%0, %1, %3				\n"
		"	.set	mips0					\n"
		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
		: "Ir" (i), "m" (l->a.counter)
		: "memory");
	} else if (cpu_has_llsc) {
		unsigned long temp;

		__asm__ __volatile__(
		"	.set	mips3					\n"
		"1:"	__LL	"%1, %2		# local_add_return	\n"
		"	addu	%0, %1, %3				\n"
			__SC	"%0, %2					\n"
		"	beqz	%0, 1b					\n"
		"	addu	%0, %1, %3				\n"
		"	.set	mips0					\n"
		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
		: "Ir" (i), "m" (l->a.counter)
		: "memory");
	} else {
		unsigned long flags;


#ifdef CONFIG_64BIT
		local_irq_save(flags);
		result = l->a.counter;
		result += i;
		l->a.counter = result;
		local_irq_restore(flags);
	}


typedef atomic64_t local_t;
	return result;
}


#define LOCAL_INIT(i)	ATOMIC64_INIT(i)
static __inline__ long local_sub_return(long i, local_t * l)
#define local_read(v)	atomic64_read(v)
{
#define local_set(v,i)	atomic64_set(v,i)
	unsigned long result;


#define local_inc(v)	atomic64_inc(v)
	if (cpu_has_llsc && R10000_LLSC_WAR) {
#define local_dec(v)	atomic64_dec(v)
		unsigned long temp;
#define local_add(i, v)	atomic64_add(i, v)
#define local_sub(i, v)	atomic64_sub(i, v)


#endif
		__asm__ __volatile__(
		"	.set	mips3					\n"
		"1:"	__LL	"%1, %2		# local_sub_return	\n"
		"	subu	%0, %1, %3				\n"
			__SC	"%0, %2					\n"
		"	beqzl	%0, 1b					\n"
		"	subu	%0, %1, %3				\n"
		"	.set	mips0					\n"
		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
		: "Ir" (i), "m" (l->a.counter)
		: "memory");
	} else if (cpu_has_llsc) {
		unsigned long temp;


#define __local_inc(v)		((v)->counter++)
		__asm__ __volatile__(
#define __local_dec(v)		((v)->counter--)
		"	.set	mips3					\n"
#define __local_add(i,v)	((v)->counter+=(i))
		"1:"	__LL	"%1, %2		# local_sub_return	\n"
#define __local_sub(i,v)	((v)->counter-=(i))
		"	subu	%0, %1, %3				\n"
			__SC	"%0, %2					\n"
		"	beqz	%0, 1b					\n"
		"	subu	%0, %1, %3				\n"
		"	.set	mips0					\n"
		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
		: "Ir" (i), "m" (l->a.counter)
		: "memory");
	} else {
		unsigned long flags;

		local_irq_save(flags);
		result = l->a.counter;
		result -= i;
		l->a.counter = result;
		local_irq_restore(flags);
	}

	return result;
}


/*
/*
 * Use these for per-cpu local_t variables: on some archs they are
 * local_sub_if_positive - conditionally subtract integer from atomic variable
 * @i: integer value to subtract
 * @l: pointer of type local_t
 *
 * Atomically test @l and subtract @i if @l is greater or equal than @i.
 * The function returns the old value of @l minus @i.
 */
static __inline__ long local_sub_if_positive(long i, local_t * l)
{
	unsigned long result;

	if (cpu_has_llsc && R10000_LLSC_WAR) {
		unsigned long temp;

		__asm__ __volatile__(
		"	.set	mips3					\n"
		"1:"	__LL	"%1, %2		# local_sub_if_positive\n"
		"	dsubu	%0, %1, %3				\n"
		"	bltz	%0, 1f					\n"
			__SC	"%0, %2					\n"
		"	.set	noreorder				\n"
		"	beqzl	%0, 1b					\n"
		"	 dsubu	%0, %1, %3				\n"
		"	.set	reorder					\n"
		"1:							\n"
		"	.set	mips0					\n"
		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
		: "Ir" (i), "m" (l->a.counter)
		: "memory");
	} else if (cpu_has_llsc) {
		unsigned long temp;

		__asm__ __volatile__(
		"	.set	mips3					\n"
		"1:"	__LL	"%1, %2		# local_sub_if_positive\n"
		"	dsubu	%0, %1, %3				\n"
		"	bltz	%0, 1f					\n"
			__SC	"%0, %2					\n"
		"	.set	noreorder				\n"
		"	beqz	%0, 1b					\n"
		"	 dsubu	%0, %1, %3				\n"
		"	.set	reorder					\n"
		"1:							\n"
		"	.set	mips0					\n"
		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
		: "Ir" (i), "m" (l->a.counter)
		: "memory");
	} else {
		unsigned long flags;

		local_irq_save(flags);
		result = l->a.counter;
		result -= i;
		if (result >= 0)
			l->a.counter = result;
		local_irq_restore(flags);
	}

	return result;
}

#define local_cmpxchg(l, o, n) \
	((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
#define local_xchg(l, n) (xchg_local(&((l)->a.counter),(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_dec_if_positive - decrement by 1 if old value positive
 * @l: pointer of type local_t
 */
#define local_dec_if_positive(l)	local_sub_if_positive(1, l)

/*
 * 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
 * much more efficient than these naive implementations.  Note they take
 * a variable, not an address.
 * a variable, not an address.
 */
 */
#define cpu_local_read(v)	local_read(&__get_cpu_var(v))
#define cpu_local_set(v, i)	local_set(&__get_cpu_var(v), (i))


#define cpu_local_inc(v)	local_inc(&__get_cpu_var(v))
#define __local_inc(l)		((l)->a.counter++)
#define cpu_local_dec(v)	local_dec(&__get_cpu_var(v))
#define __local_dec(l)		((l)->a.counter++)
#define cpu_local_add(i, v)	local_add((i), &__get_cpu_var(v))
#define __local_add(i,l)	((l)->a.counter+=(i))
#define cpu_local_sub(i, v)	local_sub((i), &__get_cpu_var(v))
#define __local_sub(i,l)	((l)->a.counter-=(i))

/* 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(l)	 	\
	({ local_t res__;		\
	   preempt_disable(); 		\
	   res__ = (l);			\
	   preempt_enable();		\
	   res__; })
#define cpu_local_wrap(l)		\
	({ preempt_disable();		\
	   l;				\
	   preempt_enable(); })		\

#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)	__local_inc(&__get_cpu_var(v))
#define __cpu_local_inc(l)	cpu_local_inc(l)
#define __cpu_local_dec(v)	__local_dec(&__get_cpu_var(v))
#define __cpu_local_dec(l)	cpu_local_dec(l)
#define __cpu_local_add(i, v)	__local_add((i), &__get_cpu_var(v))
#define __cpu_local_add(i, l)	cpu_local_add((i), (l))
#define __cpu_local_sub(i, v)	__local_sub((i), &__get_cpu_var(v))
#define __cpu_local_sub(i, l)	cpu_local_sub((i), (l))


#endif /* _ASM_LOCAL_H */
#endif /* _ARCH_MIPS_LOCAL_H */
+124 −1
Original line number Original line Diff line number Diff line
@@ -262,6 +262,58 @@ static inline unsigned long __cmpxchg_u32(volatile int * m, unsigned long old,
	return retval;
	return retval;
}
}


static inline unsigned long __cmpxchg_u32_local(volatile int * m,
	unsigned long old, unsigned long new)
{
	__u32 retval;

	if (cpu_has_llsc && R10000_LLSC_WAR) {
		__asm__ __volatile__(
		"	.set	push					\n"
		"	.set	noat					\n"
		"	.set	mips3					\n"
		"1:	ll	%0, %2			# __cmpxchg_u32	\n"
		"	bne	%0, %z3, 2f				\n"
		"	.set	mips0					\n"
		"	move	$1, %z4					\n"
		"	.set	mips3					\n"
		"	sc	$1, %1					\n"
		"	beqzl	$1, 1b					\n"
		"2:							\n"
		"	.set	pop					\n"
		: "=&r" (retval), "=R" (*m)
		: "R" (*m), "Jr" (old), "Jr" (new)
		: "memory");
	} else if (cpu_has_llsc) {
		__asm__ __volatile__(
		"	.set	push					\n"
		"	.set	noat					\n"
		"	.set	mips3					\n"
		"1:	ll	%0, %2			# __cmpxchg_u32	\n"
		"	bne	%0, %z3, 2f				\n"
		"	.set	mips0					\n"
		"	move	$1, %z4					\n"
		"	.set	mips3					\n"
		"	sc	$1, %1					\n"
		"	beqz	$1, 1b					\n"
		"2:							\n"
		"	.set	pop					\n"
		: "=&r" (retval), "=R" (*m)
		: "R" (*m), "Jr" (old), "Jr" (new)
		: "memory");
	} else {
		unsigned long flags;

		local_irq_save(flags);
		retval = *m;
		if (retval == old)
			*m = new;
		local_irq_restore(flags);	/* implies memory barrier  */
	}

	return retval;
}

#ifdef CONFIG_64BIT
#ifdef CONFIG_64BIT
static inline unsigned long __cmpxchg_u64(volatile int * m, unsigned long old,
static inline unsigned long __cmpxchg_u64(volatile int * m, unsigned long old,
	unsigned long new)
	unsigned long new)
@@ -315,10 +367,62 @@ static inline unsigned long __cmpxchg_u64(volatile int * m, unsigned long old,


	return retval;
	return retval;
}
}

static inline unsigned long __cmpxchg_u64_local(volatile int * m,
	unsigned long old, unsigned long new)
{
	__u64 retval;

	if (cpu_has_llsc && R10000_LLSC_WAR) {
		__asm__ __volatile__(
		"	.set	push					\n"
		"	.set	noat					\n"
		"	.set	mips3					\n"
		"1:	lld	%0, %2			# __cmpxchg_u64	\n"
		"	bne	%0, %z3, 2f				\n"
		"	move	$1, %z4					\n"
		"	scd	$1, %1					\n"
		"	beqzl	$1, 1b					\n"
		"2:							\n"
		"	.set	pop					\n"
		: "=&r" (retval), "=R" (*m)
		: "R" (*m), "Jr" (old), "Jr" (new)
		: "memory");
	} else if (cpu_has_llsc) {
		__asm__ __volatile__(
		"	.set	push					\n"
		"	.set	noat					\n"
		"	.set	mips3					\n"
		"1:	lld	%0, %2			# __cmpxchg_u64	\n"
		"	bne	%0, %z3, 2f				\n"
		"	move	$1, %z4					\n"
		"	scd	$1, %1					\n"
		"	beqz	$1, 1b					\n"
		"2:							\n"
		"	.set	pop					\n"
		: "=&r" (retval), "=R" (*m)
		: "R" (*m), "Jr" (old), "Jr" (new)
		: "memory");
	} else {
		unsigned long flags;

		local_irq_save(flags);
		retval = *m;
		if (retval == old)
			*m = new;
		local_irq_restore(flags);	/* implies memory barrier  */
	}

	return retval;
}

#else
#else
extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels(
extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels(
	volatile int * m, unsigned long old, unsigned long new);
	volatile int * m, unsigned long old, unsigned long new);
#define __cmpxchg_u64 __cmpxchg_u64_unsupported_on_32bit_kernels
#define __cmpxchg_u64 __cmpxchg_u64_unsupported_on_32bit_kernels
extern unsigned long __cmpxchg_u64_local_unsupported_on_32bit_kernels(
	volatile int * m, unsigned long old, unsigned long new);
#define __cmpxchg_u64_local __cmpxchg_u64_local_unsupported_on_32bit_kernels
#endif
#endif


/* This function doesn't exist, so you'll get a linker error
/* This function doesn't exist, so you'll get a linker error
@@ -338,7 +442,26 @@ static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
	return old;
	return old;
}
}


#define cmpxchg(ptr,old,new) ((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(old), (unsigned long)(new),sizeof(*(ptr))))
static inline unsigned long __cmpxchg_local(volatile void * ptr,
	unsigned long old, unsigned long new, int size)
{
	switch (size) {
	case 4:
		return __cmpxchg_u32_local(ptr, old, new);
	case 8:
		return __cmpxchg_u64_local(ptr, old, new);
	}
	__cmpxchg_called_with_bad_pointer();
	return old;
}

#define cmpxchg(ptr,old,new) \
	((__typeof__(*(ptr)))__cmpxchg((ptr), \
		(unsigned long)(old), (unsigned long)(new),sizeof(*(ptr))))

#define cmpxchg_local(ptr,old,new) \
	((__typeof__(*(ptr)))__cmpxchg_local((ptr), \
		(unsigned long)(old), (unsigned long)(new),sizeof(*(ptr))))


extern void set_handler (unsigned long offset, void *addr, unsigned long len);
extern void set_handler (unsigned long offset, void *addr, unsigned long len);
extern void set_uncached_handler (unsigned long offset, void *addr, unsigned long len);
extern void set_uncached_handler (unsigned long offset, void *addr, unsigned long len);