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    Subject[PATCH 07/10] local_t : powerpc extension
    Date
    local_t : powerpc extension

    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>

    --- a/include/asm-powerpc/local.h
    +++ b/include/asm-powerpc/local.h
    @@ -1 +1,342 @@
    -#include <asm-generic/local.h>
    +#ifndef _ARCH_POWERPC_LOCAL_H
    +#define _ARCH_POWERPC_LOCAL_H
    +
    +#include <linux/percpu.h>
    +#include <asm/atomic.h>
    +
    +typedef struct
    +{
    + atomic_long_t a;
    +} local_t;
    +
    +#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
    +
    +#define local_read(l) atomic_long_read(&(l)->a)
    +#define local_set(l,i) atomic_long_set(&(l)->a, (i))
    +
    +#define local_add(i,l) atomic_long_add((i),(&(l)->a))
    +#define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
    +#define local_inc(l) atomic_long_inc(&(l)->a)
    +#define local_dec(l) atomic_long_dec(&(l)->a)
    +
    +#ifndef __powerpc64__
    +
    +static __inline__ int local_add_return(int a, local_t *l)
    +{
    + int t;
    +
    + __asm__ __volatile__(
    +"1: lwarx %0,0,%2 # local_add_return\n\
    + add %0,%1,%0\n"
    + PPC405_ERR77(0,%2)
    +" stwcx. %0,0,%2 \n\
    + bne- 1b"
    + : "=&r" (t)
    + : "r" (a), "r" (&(l->a.counter))
    + : "cc", "memory");
    +
    + return t;
    +}
    +
    +#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
    +
    +static __inline__ int local_sub_return(int a, local_t *l)
    +{
    + int t;
    +
    + __asm__ __volatile__(
    +"1: lwarx %0,0,%2 # local_sub_return\n\
    + subf %0,%1,%0\n"
    + PPC405_ERR77(0,%2)
    +" stwcx. %0,0,%2 \n\
    + bne- 1b"
    + : "=&r" (t)
    + : "r" (a), "r" (&(l->a.counter))
    + : "cc", "memory");
    +
    + return t;
    +}
    +
    +static __inline__ int local_inc_return(local_t *l)
    +{
    + int t;
    +
    + __asm__ __volatile__(
    +"1: lwarx %0,0,%1 # local_inc_return\n\
    + addic %0,%0,1\n"
    + PPC405_ERR77(0,%1)
    +" stwcx. %0,0,%1 \n\
    + bne- 1b"
    + : "=&r" (t)
    + : "r" (&(l->a.counter))
    + : "cc", "memory");
    +
    + return t;
    +}
    +
    +/*
    + * 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)
    +
    +static __inline__ int local_dec_return(local_t *l)
    +{
    + int t;
    +
    + __asm__ __volatile__(
    +"1: lwarx %0,0,%1 # local_dec_return\n\
    + addic %0,%0,-1\n"
    + PPC405_ERR77(0,%1)
    +" stwcx. %0,0,%1\n\
    + bne- 1b"
    + : "=&r" (t)
    + : "r" (&(l->a.counter))
    + : "cc", "memory");
    +
    + return t;
    +}
    +
    +#define local_cmpxchg(l, o, n) \
    + (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 v...
    + * @u: ...unless v 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, int a, int u)
    +{
    + int t;
    +
    + __asm__ __volatile__ (
    +"1: lwarx %0,0,%1 # local_add_unless\n\
    + cmpw 0,%0,%3 \n\
    + beq- 2f \n\
    + add %0,%2,%0 \n"
    + PPC405_ERR77(0,%2)
    +" stwcx. %0,0,%1 \n\
    + bne- 1b \n"
    +" subf %0,%2,%0 \n\
    +2:"
    + : "=&r" (t)
    + : "r" (&(l->a.counter)), "r" (a), "r" (u)
    + : "cc", "memory");
    +
    + return t != u;
    +}
    +
    +#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
    +
    +#define local_sub_and_test(a, l) (local_sub_return((a), (l)) == 0)
    +#define local_dec_and_test(l) (local_dec_return((l)) == 0)
    +
    +/*
    + * Atomically test *l and decrement if it is greater than 0.
    + * The function returns the old value of *l minus 1.
    + */
    +static __inline__ int local_dec_if_positive(local_t *l)
    +{
    + int t;
    +
    + __asm__ __volatile__(
    +"1: lwarx %0,0,%1 # local_dec_if_positive\n\
    + cmpwi %0,1\n\
    + addi %0,%0,-1\n\
    + blt- 2f\n"
    + PPC405_ERR77(0,%1)
    +" stwcx. %0,0,%1\n\
    + bne- 1b"
    + "\n\
    +2:" : "=&b" (t)
    + : "r" (&(l->a.counter))
    + : "cc", "memory");
    +
    + return t;
    +}
    +
    +#else /* __powerpc64__ */
    +
    +static __inline__ long local_add_return(long a, local_t *l)
    +{
    + long t;
    +
    + __asm__ __volatile__(
    +"1: ldarx %0,0,%2 # local_add_return\n\
    + add %0,%1,%0\n\
    + stdcx. %0,0,%2 \n\
    + bne- 1b"
    + : "=&r" (t)
    + : "r" (a), "r" (&(l->a.counter))
    + : "cc", "memory");
    +
    + return t;
    +}
    +
    +#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
    +
    +static __inline__ long local_sub_return(long a, local_t *l)
    +{
    + long t;
    +
    + __asm__ __volatile__(
    +"1: ldarx %0,0,%2 # local_sub_return\n\
    + subf %0,%1,%0\n\
    + stdcx. %0,0,%2 \n\
    + bne- 1b"
    + : "=&r" (t)
    + : "r" (a), "r" (&(l->a.counter))
    + : "cc", "memory");
    +
    + return t;
    +}
    +
    +static __inline__ long local_inc_return(local_t *l)
    +{
    + long t;
    +
    + __asm__ __volatile__(
    +"1: ldarx %0,0,%1 # local_inc_return\n\
    + addic %0,%0,1\n\
    + stdcx. %0,0,%1 \n\
    + bne- 1b"
    + : "=&r" (t)
    + : "r" (&(l->a.counter))
    + : "cc", "memory");
    +
    + return t;
    +}
    +
    +/*
    + * 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)
    +
    +static __inline__ long local_dec_return(local_t *l)
    +{
    + long t;
    +
    + __asm__ __volatile__(
    +"1: ldarx %0,0,%1 # local_dec_return\n\
    + addic %0,%0,-1\n\
    + stdcx. %0,0,%1\n\
    + bne- 1b"
    + : "=&r" (t)
    + : "r" (&(l->a.counter))
    + : "cc", "memory");
    +
    + return t;
    +}
    +
    +#define local_sub_and_test(a, l) (local_sub_return((a), (l)) == 0)
    +#define local_dec_and_test(l) (local_dec_return((l)) == 0)
    +
    +/*
    + * Atomically test *l and decrement if it is greater than 0.
    + * The function returns the old value of *l minus 1.
    + */
    +static __inline__ long local_dec_if_positive(local_t *l)
    +{
    + long t;
    +
    + __asm__ __volatile__(
    +"1: ldarx %0,0,%1 # local_dec_if_positive\n\
    + addic. %0,%0,-1\n\
    + blt- 2f\n\
    + stdcx. %0,0,%1\n\
    + bne- 1b"
    + "\n\
    +2:" : "=&r" (t)
    + : "r" (&(l->a.counter))
    + : "cc", "memory");
    +
    + return t;
    +}
    +
    +#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.
    + */
    +static __inline__ int local_add_unless(local_t *l, long a, long u)
    +{
    + long t;
    +
    + __asm__ __volatile__ (
    +"1: ldarx %0,0,%1 # local_add_unless\n\
    + cmpd 0,%0,%3 \n\
    + beq- 2f \n\
    + add %0,%2,%0 \n"
    +" stdcx. %0,0,%1 \n\
    + bne- 1b \n"
    +" subf %0,%2,%0 \n\
    +2:"
    + : "=&r" (t)
    + : "r" (&(l->a.counter)), "r" (a), "r" (u)
    + : "cc", "memory");
    +
    + return t != u;
    +}
    +
    +#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
    +
    +#endif /* !__powerpc64__ */
    +
    +/* 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))
    +
    +/* 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(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_POWERPC_LOCAL_H */
    --- a/include/asm-powerpc/system.h
    +++ b/include/asm-powerpc/system.h
    @@ -7,7 +7,6 @@
    #include <linux/kernel.h>

    #include <asm/hw_irq.h>
    -#include <asm/atomic.h>

    /*
    * Memory barrier.
    @@ -226,6 +225,29 @@ __xchg_u32(volatile void *p, unsigned long val)
    return prev;
    }

    +/*
    + * Atomic exchange
    + *
    + * Changes the memory location '*ptr' to be val and returns
    + * the previous value stored there.
    + */
    +static __inline__ unsigned long
    +__xchg_u32_local(volatile void *p, unsigned long val)
    +{
    + unsigned long prev;
    +
    + __asm__ __volatile__(
    +"1: lwarx %0,0,%2 \n"
    + PPC405_ERR77(0,%2)
    +" stwcx. %3,0,%2 \n\
    + bne- 1b"
    + : "=&r" (prev), "+m" (*(volatile unsigned int *)p)
    + : "r" (p), "r" (val)
    + : "cc", "memory");
    +
    + return prev;
    +}
    +
    #ifdef CONFIG_PPC64
    static __inline__ unsigned long
    __xchg_u64(volatile void *p, unsigned long val)
    @@ -245,6 +267,23 @@ __xchg_u64(volatile void *p, unsigned long val)

    return prev;
    }
    +
    +static __inline__ unsigned long
    +__xchg_u64_local(volatile void *p, unsigned long val)
    +{
    + unsigned long prev;
    +
    + __asm__ __volatile__(
    +"1: ldarx %0,0,%2 \n"
    + PPC405_ERR77(0,%2)
    +" stdcx. %3,0,%2 \n\
    + bne- 1b"
    + : "=&r" (prev), "+m" (*(volatile unsigned long *)p)
    + : "r" (p), "r" (val)
    + : "cc", "memory");
    +
    + return prev;
    +}
    #endif

    /*
    @@ -268,12 +307,33 @@ __xchg(volatile void *ptr, unsigned long x, unsigned int size)
    return x;
    }

    +static __inline__ unsigned long
    +__xchg_local(volatile void *ptr, unsigned long x, unsigned int size)
    +{
    + switch (size) {
    + case 4:
    + return __xchg_u32_local(ptr, x);
    +#ifdef CONFIG_PPC64
    + case 8:
    + return __xchg_u64_local(ptr, x);
    +#endif
    + }
    + __xchg_called_with_bad_pointer();
    + return x;
    +}
    #define xchg(ptr,x) \
    ({ \
    __typeof__(*(ptr)) _x_ = (x); \
    (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \
    })

    +#define xchg_local(ptr,x) \
    + ({ \
    + __typeof__(*(ptr)) _x_ = (x); \
    + (__typeof__(*(ptr))) __xchg_local((ptr), \
    + (unsigned long)_x_, sizeof(*(ptr))); \
    + })
    +
    #define tas(ptr) (xchg((ptr),1))

    /*
    @@ -305,6 +365,28 @@ __cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new)
    return prev;
    }

    +static __inline__ unsigned long
    +__cmpxchg_u32_local(volatile unsigned int *p, unsigned long old,
    + unsigned long new)
    +{
    + unsigned int prev;
    +
    + __asm__ __volatile__ (
    +"1: lwarx %0,0,%2 # __cmpxchg_u32\n\
    + cmpw 0,%0,%3\n\
    + bne- 2f\n"
    + PPC405_ERR77(0,%2)
    +" stwcx. %4,0,%2\n\
    + bne- 1b"
    + "\n\
    +2:"
    + : "=&r" (prev), "+m" (*p)
    + : "r" (p), "r" (old), "r" (new)
    + : "cc", "memory");
    +
    + return prev;
    +}
    +
    #ifdef CONFIG_PPC64
    static __inline__ unsigned long
    __cmpxchg_u64(volatile unsigned long *p, unsigned long old, unsigned long new)
    @@ -327,6 +409,27 @@ __cmpxchg_u64(volatile unsigned long *p, unsigned long old, unsigned long new)

    return prev;
    }
    +
    +static __inline__ unsigned long
    +__cmpxchg_u64_local(volatile unsigned long *p, unsigned long old,
    + unsigned long new)
    +{
    + unsigned long prev;
    +
    + __asm__ __volatile__ (
    +"1: ldarx %0,0,%2 # __cmpxchg_u64\n\
    + cmpd 0,%0,%3\n\
    + bne- 2f\n\
    + stdcx. %4,0,%2\n\
    + bne- 1b"
    + "\n\
    +2:"
    + : "=&r" (prev), "+m" (*p)
    + : "r" (p), "r" (old), "r" (new)
    + : "cc", "memory");
    +
    + return prev;
    +}
    #endif

    /* This function doesn't exist, so you'll get a linker error
    @@ -349,6 +452,22 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
    return old;
    }

    +static __inline__ unsigned long
    +__cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new,
    + unsigned int size)
    +{
    + switch (size) {
    + case 4:
    + return __cmpxchg_u32_local(ptr, old, new);
    +#ifdef CONFIG_PPC64
    + case 8:
    + return __cmpxchg_u64_local(ptr, old, new);
    +#endif
    + }
    + __cmpxchg_called_with_bad_pointer();
    + return old;
    +}
    +
    #define cmpxchg(ptr,o,n) \
    ({ \
    __typeof__(*(ptr)) _o_ = (o); \
    @@ -357,6 +476,15 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
    (unsigned long)_n_, sizeof(*(ptr))); \
    })

    +
    +#define cmpxchg_local(ptr,o,n) \
    + ({ \
    + __typeof__(*(ptr)) _o_ = (o); \
    + __typeof__(*(ptr)) _n_ = (n); \
    + (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
    + (unsigned long)_n_, sizeof(*(ptr))); \
    + })
    +
    #ifdef CONFIG_PPC64
    /*
    * We handle most unaligned accesses in hardware. On the other hand
    -
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      Last update: 2007-02-11 20:27    [W:0.052 / U:31.964 seconds]
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