mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 00:17:44 +00:00
7fa2ac3728
On m32r, use the new cmpxchg_local as primitive for the local_cmpxchg operation. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Acked-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
366 lines
8.8 KiB
C
366 lines
8.8 KiB
C
#ifndef __M32R_LOCAL_H
|
|
#define __M32R_LOCAL_H
|
|
|
|
/*
|
|
* linux/include/asm-m32r/local.h
|
|
*
|
|
* M32R version:
|
|
* Copyright (C) 2001, 2002 Hitoshi Yamamoto
|
|
* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
|
|
* Copyright (C) 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
|
|
*/
|
|
|
|
#include <linux/percpu.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/system.h>
|
|
#include <asm/local.h>
|
|
|
|
/*
|
|
* Atomic operations that C can't guarantee us. Useful for
|
|
* resource counting etc..
|
|
*/
|
|
|
|
/*
|
|
* Make sure gcc doesn't try to be clever and move things around
|
|
* on us. We need to use _exactly_ the address the user gave us,
|
|
* not some alias that contains the same information.
|
|
*/
|
|
typedef struct { volatile int counter; } local_t;
|
|
|
|
#define LOCAL_INIT(i) { (i) }
|
|
|
|
/**
|
|
* local_read - read local variable
|
|
* @l: pointer of type local_t
|
|
*
|
|
* Atomically reads the value of @l.
|
|
*/
|
|
#define local_read(l) ((l)->counter)
|
|
|
|
/**
|
|
* local_set - set local variable
|
|
* @l: pointer of type local_t
|
|
* @i: required value
|
|
*
|
|
* Atomically sets the value of @l to @i.
|
|
*/
|
|
#define local_set(l, i) (((l)->counter) = (i))
|
|
|
|
/**
|
|
* local_add_return - add long to local variable and return it
|
|
* @i: long value to add
|
|
* @l: pointer of type local_t
|
|
*
|
|
* Atomically adds @i to @l and return (@i + @l).
|
|
*/
|
|
static inline long local_add_return(long i, local_t *l)
|
|
{
|
|
unsigned long flags;
|
|
long result;
|
|
|
|
local_irq_save(flags);
|
|
__asm__ __volatile__ (
|
|
"# local_add_return \n\t"
|
|
DCACHE_CLEAR("%0", "r4", "%1")
|
|
"ld %0, @%1; \n\t"
|
|
"add %0, %2; \n\t"
|
|
"st %0, @%1; \n\t"
|
|
: "=&r" (result)
|
|
: "r" (&l->counter), "r" (i)
|
|
: "memory"
|
|
#ifdef CONFIG_CHIP_M32700_TS1
|
|
, "r4"
|
|
#endif /* CONFIG_CHIP_M32700_TS1 */
|
|
);
|
|
local_irq_restore(flags);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* local_sub_return - subtract long from local variable and return it
|
|
* @i: long value to subtract
|
|
* @l: pointer of type local_t
|
|
*
|
|
* Atomically subtracts @i from @l and return (@l - @i).
|
|
*/
|
|
static inline long local_sub_return(long i, local_t *l)
|
|
{
|
|
unsigned long flags;
|
|
long result;
|
|
|
|
local_irq_save(flags);
|
|
__asm__ __volatile__ (
|
|
"# local_sub_return \n\t"
|
|
DCACHE_CLEAR("%0", "r4", "%1")
|
|
"ld %0, @%1; \n\t"
|
|
"sub %0, %2; \n\t"
|
|
"st %0, @%1; \n\t"
|
|
: "=&r" (result)
|
|
: "r" (&l->counter), "r" (i)
|
|
: "memory"
|
|
#ifdef CONFIG_CHIP_M32700_TS1
|
|
, "r4"
|
|
#endif /* CONFIG_CHIP_M32700_TS1 */
|
|
);
|
|
local_irq_restore(flags);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* local_add - add long to local variable
|
|
* @i: long value to add
|
|
* @l: pointer of type local_t
|
|
*
|
|
* Atomically adds @i to @l.
|
|
*/
|
|
#define local_add(i, l) ((void) local_add_return((i), (l)))
|
|
|
|
/**
|
|
* local_sub - subtract the local variable
|
|
* @i: long value to subtract
|
|
* @l: pointer of type local_t
|
|
*
|
|
* Atomically subtracts @i from @l.
|
|
*/
|
|
#define local_sub(i, l) ((void) local_sub_return((i), (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_return - increment local variable and return it
|
|
* @l: pointer of type local_t
|
|
*
|
|
* Atomically increments @l by 1 and returns the result.
|
|
*/
|
|
static inline long local_inc_return(local_t *l)
|
|
{
|
|
unsigned long flags;
|
|
long result;
|
|
|
|
local_irq_save(flags);
|
|
__asm__ __volatile__ (
|
|
"# local_inc_return \n\t"
|
|
DCACHE_CLEAR("%0", "r4", "%1")
|
|
"ld %0, @%1; \n\t"
|
|
"addi %0, #1; \n\t"
|
|
"st %0, @%1; \n\t"
|
|
: "=&r" (result)
|
|
: "r" (&l->counter)
|
|
: "memory"
|
|
#ifdef CONFIG_CHIP_M32700_TS1
|
|
, "r4"
|
|
#endif /* CONFIG_CHIP_M32700_TS1 */
|
|
);
|
|
local_irq_restore(flags);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* local_dec_return - decrement local variable and return it
|
|
* @l: pointer of type local_t
|
|
*
|
|
* Atomically decrements @l by 1 and returns the result.
|
|
*/
|
|
static inline long local_dec_return(local_t *l)
|
|
{
|
|
unsigned long flags;
|
|
long result;
|
|
|
|
local_irq_save(flags);
|
|
__asm__ __volatile__ (
|
|
"# local_dec_return \n\t"
|
|
DCACHE_CLEAR("%0", "r4", "%1")
|
|
"ld %0, @%1; \n\t"
|
|
"addi %0, #-1; \n\t"
|
|
"st %0, @%1; \n\t"
|
|
: "=&r" (result)
|
|
: "r" (&l->counter)
|
|
: "memory"
|
|
#ifdef CONFIG_CHIP_M32700_TS1
|
|
, "r4"
|
|
#endif /* CONFIG_CHIP_M32700_TS1 */
|
|
);
|
|
local_irq_restore(flags);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* local_inc - increment local variable
|
|
* @l: pointer of type local_t
|
|
*
|
|
* Atomically increments @l by 1.
|
|
*/
|
|
#define local_inc(l) ((void)local_inc_return(l))
|
|
|
|
/**
|
|
* local_dec - decrement local variable
|
|
* @l: pointer of type local_t
|
|
*
|
|
* Atomically decrements @l by 1.
|
|
*/
|
|
#define local_dec(l) ((void)local_dec_return(l))
|
|
|
|
/**
|
|
* 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 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_dec_return(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)
|
|
|
|
#define local_cmpxchg(l, o, n) (cmpxchg_local(&((l)->counter), (o), (n)))
|
|
#define local_xchg(v, new) (xchg_local(&((l)->counter), new))
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
static inline int local_add_unless(local_t *l, long a, long 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;
|
|
}
|
|
return c != (u);
|
|
}
|
|
|
|
#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
|
|
|
|
static inline void local_clear_mask(unsigned long mask, local_t *addr)
|
|
{
|
|
unsigned long flags;
|
|
unsigned long tmp;
|
|
|
|
local_irq_save(flags);
|
|
__asm__ __volatile__ (
|
|
"# local_clear_mask \n\t"
|
|
DCACHE_CLEAR("%0", "r5", "%1")
|
|
"ld %0, @%1; \n\t"
|
|
"and %0, %2; \n\t"
|
|
"st %0, @%1; \n\t"
|
|
: "=&r" (tmp)
|
|
: "r" (addr), "r" (~mask)
|
|
: "memory"
|
|
#ifdef CONFIG_CHIP_M32700_TS1
|
|
, "r5"
|
|
#endif /* CONFIG_CHIP_M32700_TS1 */
|
|
);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static inline void local_set_mask(unsigned long mask, local_t *addr)
|
|
{
|
|
unsigned long flags;
|
|
unsigned long tmp;
|
|
|
|
local_irq_save(flags);
|
|
__asm__ __volatile__ (
|
|
"# local_set_mask \n\t"
|
|
DCACHE_CLEAR("%0", "r5", "%1")
|
|
"ld %0, @%1; \n\t"
|
|
"or %0, %2; \n\t"
|
|
"st %0, @%1; \n\t"
|
|
: "=&r" (tmp)
|
|
: "r" (addr), "r" (mask)
|
|
: "memory"
|
|
#ifdef CONFIG_CHIP_M32700_TS1
|
|
, "r5"
|
|
#endif /* CONFIG_CHIP_M32700_TS1 */
|
|
);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/* Atomic operations are already serializing on m32r */
|
|
#define smp_mb__before_local_dec() barrier()
|
|
#define smp_mb__after_local_dec() barrier()
|
|
#define smp_mb__before_local_inc() barrier()
|
|
#define smp_mb__after_local_inc() barrier()
|
|
|
|
/* 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))
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
/* Need to disable preemption for the cpu local counters otherwise we could
|
|
still access a variable of a previous CPU in a non local 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(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 /* __M32R_LOCAL_H */
|