local_t: mips extension
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Ralf Baechle <ralf@linux-mips.org> 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
4431f46f5f
commit
7232311ef1
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@ -1,60 +1,288 @@
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#ifndef _ASM_LOCAL_H
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#define _ASM_LOCAL_H
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#ifndef _ARCH_MIPS_LOCAL_H
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#define _ARCH_MIPS_LOCAL_H
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#include <linux/percpu.h>
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#include <linux/bitops.h>
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#include <asm/atomic.h>
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#include <asm/war.h>
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#ifdef CONFIG_32BIT
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typedef struct
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{
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atomic_long_t a;
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} local_t;
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typedef atomic_t local_t;
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#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
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#define LOCAL_INIT(i) ATOMIC_INIT(i)
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#define local_read(v) atomic_read(v)
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#define local_set(v,i) atomic_set(v,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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#define local_inc(v) atomic_inc(v)
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#define local_dec(v) atomic_dec(v)
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#define local_add(i, v) atomic_add(i, v)
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#define local_sub(i, v) atomic_sub(i, v)
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#endif
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#ifdef CONFIG_64BIT
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typedef atomic64_t local_t;
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#define LOCAL_INIT(i) ATOMIC64_INIT(i)
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#define local_read(v) atomic64_read(v)
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#define local_set(v,i) atomic64_set(v,i)
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#define local_inc(v) atomic64_inc(v)
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#define local_dec(v) atomic64_dec(v)
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#define local_add(i, v) atomic64_add(i, v)
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#define local_sub(i, v) atomic64_sub(i, v)
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#endif
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#define __local_inc(v) ((v)->counter++)
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#define __local_dec(v) ((v)->counter--)
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#define __local_add(i,v) ((v)->counter+=(i))
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#define __local_sub(i,v) ((v)->counter-=(i))
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#define local_add(i,l) atomic_long_add((i),(&(l)->a))
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#define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
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#define local_inc(l) atomic_long_inc(&(l)->a)
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#define local_dec(l) atomic_long_dec(&(l)->a)
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/*
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* Use these for per-cpu local_t variables: on some archs they are
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* Same as above, but return the result value
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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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unsigned long result;
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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unsigned long temp;
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__asm__ __volatile__(
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" .set mips3 \n"
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"1:" __LL "%1, %2 # local_add_return \n"
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" addu %0, %1, %3 \n"
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__SC "%0, %2 \n"
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" beqzl %0, 1b \n"
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" addu %0, %1, %3 \n"
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" .set mips0 \n"
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: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
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: "Ir" (i), "m" (l->a.counter)
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: "memory");
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} else if (cpu_has_llsc) {
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unsigned long temp;
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__asm__ __volatile__(
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" .set mips3 \n"
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"1:" __LL "%1, %2 # local_add_return \n"
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" addu %0, %1, %3 \n"
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__SC "%0, %2 \n"
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" beqz %0, 1b \n"
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" addu %0, %1, %3 \n"
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" .set mips0 \n"
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: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
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: "Ir" (i), "m" (l->a.counter)
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: "memory");
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} else {
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unsigned long flags;
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local_irq_save(flags);
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result = l->a.counter;
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result += i;
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l->a.counter = result;
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local_irq_restore(flags);
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}
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return result;
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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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unsigned long result;
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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unsigned long temp;
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__asm__ __volatile__(
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" .set mips3 \n"
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"1:" __LL "%1, %2 # local_sub_return \n"
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" subu %0, %1, %3 \n"
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__SC "%0, %2 \n"
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" beqzl %0, 1b \n"
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" subu %0, %1, %3 \n"
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" .set mips0 \n"
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: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
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: "Ir" (i), "m" (l->a.counter)
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: "memory");
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} else if (cpu_has_llsc) {
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unsigned long temp;
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__asm__ __volatile__(
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" .set mips3 \n"
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"1:" __LL "%1, %2 # local_sub_return \n"
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" subu %0, %1, %3 \n"
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__SC "%0, %2 \n"
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" beqz %0, 1b \n"
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" subu %0, %1, %3 \n"
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" .set mips0 \n"
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: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
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: "Ir" (i), "m" (l->a.counter)
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: "memory");
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} else {
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unsigned long flags;
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local_irq_save(flags);
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result = l->a.counter;
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result -= i;
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l->a.counter = result;
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local_irq_restore(flags);
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}
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return result;
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}
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/*
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* local_sub_if_positive - conditionally subtract integer from atomic variable
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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 test @l and subtract @i if @l is greater or equal than @i.
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* The function returns the old value of @l minus @i.
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*/
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static __inline__ long local_sub_if_positive(long i, local_t * l)
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{
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unsigned long result;
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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unsigned long temp;
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__asm__ __volatile__(
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" .set mips3 \n"
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"1:" __LL "%1, %2 # local_sub_if_positive\n"
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" dsubu %0, %1, %3 \n"
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" bltz %0, 1f \n"
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__SC "%0, %2 \n"
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" .set noreorder \n"
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" beqzl %0, 1b \n"
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" dsubu %0, %1, %3 \n"
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" .set reorder \n"
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"1: \n"
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" .set mips0 \n"
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: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
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: "Ir" (i), "m" (l->a.counter)
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: "memory");
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} else if (cpu_has_llsc) {
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unsigned long temp;
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__asm__ __volatile__(
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" .set mips3 \n"
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"1:" __LL "%1, %2 # local_sub_if_positive\n"
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" dsubu %0, %1, %3 \n"
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" bltz %0, 1f \n"
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__SC "%0, %2 \n"
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" .set noreorder \n"
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" beqz %0, 1b \n"
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" dsubu %0, %1, %3 \n"
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" .set reorder \n"
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"1: \n"
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" .set mips0 \n"
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: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
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: "Ir" (i), "m" (l->a.counter)
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: "memory");
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} else {
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unsigned long flags;
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local_irq_save(flags);
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result = l->a.counter;
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result -= i;
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if (result >= 0)
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l->a.counter = result;
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local_irq_restore(flags);
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}
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return result;
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}
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#define local_cmpxchg(l, o, n) \
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((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
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#define local_xchg(l, n) (xchg_local(&((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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while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
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c = old; \
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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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#define local_dec_return(l) local_sub_return(1,(l))
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#define local_inc_return(l) local_add_return(1,(l))
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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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#define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0)
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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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#define local_inc_and_test(l) (local_inc_return(l) == 0)
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/*
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* local_dec_and_test - decrement by 1 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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#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
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/*
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* local_dec_if_positive - decrement by 1 if old value positive
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* @l: pointer of type local_t
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*/
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#define local_dec_if_positive(l) local_sub_if_positive(1, l)
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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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#define local_add_negative(i,l) (local_add_return(i, (l)) < 0)
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/* Use these for per-cpu local_t variables: on some archs they are
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* much more efficient than these naive implementations. Note they take
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* a variable, not an address.
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*/
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#define cpu_local_read(v) local_read(&__get_cpu_var(v))
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#define cpu_local_set(v, i) local_set(&__get_cpu_var(v), (i))
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#define cpu_local_inc(v) local_inc(&__get_cpu_var(v))
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#define cpu_local_dec(v) local_dec(&__get_cpu_var(v))
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#define cpu_local_add(i, v) local_add((i), &__get_cpu_var(v))
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#define cpu_local_sub(i, v) local_sub((i), &__get_cpu_var(v))
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#define __local_inc(l) ((l)->a.counter++)
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#define __local_dec(l) ((l)->a.counter++)
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#define __local_add(i,l) ((l)->a.counter+=(i))
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#define __local_sub(i,l) ((l)->a.counter-=(i))
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#define __cpu_local_inc(v) __local_inc(&__get_cpu_var(v))
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#define __cpu_local_dec(v) __local_dec(&__get_cpu_var(v))
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#define __cpu_local_add(i, v) __local_add((i), &__get_cpu_var(v))
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#define __cpu_local_sub(i, v) __local_sub((i), &__get_cpu_var(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(l) \
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({ local_t res__; \
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preempt_disable(); \
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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(l) \
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({ preempt_disable(); \
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l; \
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preempt_enable(); }) \
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#endif /* _ASM_LOCAL_H */
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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(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_MIPS_LOCAL_H */
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@ -262,6 +262,58 @@ static inline unsigned long __cmpxchg_u32(volatile int * m, unsigned long old,
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return retval;
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}
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static inline unsigned long __cmpxchg_u32_local(volatile int * m,
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unsigned long old, unsigned long new)
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{
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__u32 retval;
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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__asm__ __volatile__(
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" .set push \n"
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" .set noat \n"
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" .set mips3 \n"
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"1: ll %0, %2 # __cmpxchg_u32 \n"
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" bne %0, %z3, 2f \n"
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" .set mips0 \n"
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" move $1, %z4 \n"
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" .set mips3 \n"
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" sc $1, %1 \n"
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" beqzl $1, 1b \n"
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"2: \n"
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" .set pop \n"
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: "=&r" (retval), "=R" (*m)
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: "R" (*m), "Jr" (old), "Jr" (new)
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: "memory");
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} else if (cpu_has_llsc) {
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__asm__ __volatile__(
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" .set push \n"
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" .set noat \n"
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" .set mips3 \n"
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"1: ll %0, %2 # __cmpxchg_u32 \n"
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" bne %0, %z3, 2f \n"
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" .set mips0 \n"
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" move $1, %z4 \n"
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" .set mips3 \n"
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" sc $1, %1 \n"
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" beqz $1, 1b \n"
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"2: \n"
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" .set pop \n"
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: "=&r" (retval), "=R" (*m)
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: "R" (*m), "Jr" (old), "Jr" (new)
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: "memory");
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} else {
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unsigned long flags;
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local_irq_save(flags);
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retval = *m;
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if (retval == old)
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*m = new;
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local_irq_restore(flags); /* implies memory barrier */
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}
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return retval;
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}
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#ifdef CONFIG_64BIT
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static inline unsigned long __cmpxchg_u64(volatile int * m, unsigned long old,
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unsigned long new)
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@ -315,10 +367,62 @@ static inline unsigned long __cmpxchg_u64(volatile int * m, unsigned long old,
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return retval;
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}
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static inline unsigned long __cmpxchg_u64_local(volatile int * m,
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unsigned long old, unsigned long new)
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{
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__u64 retval;
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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__asm__ __volatile__(
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" .set push \n"
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" .set noat \n"
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" .set mips3 \n"
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"1: lld %0, %2 # __cmpxchg_u64 \n"
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" bne %0, %z3, 2f \n"
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" move $1, %z4 \n"
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" scd $1, %1 \n"
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" beqzl $1, 1b \n"
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"2: \n"
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" .set pop \n"
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: "=&r" (retval), "=R" (*m)
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: "R" (*m), "Jr" (old), "Jr" (new)
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: "memory");
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} else if (cpu_has_llsc) {
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__asm__ __volatile__(
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" .set push \n"
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" .set noat \n"
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" .set mips3 \n"
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"1: lld %0, %2 # __cmpxchg_u64 \n"
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" bne %0, %z3, 2f \n"
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" 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
|
||||
extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels(
|
||||
volatile int * m, unsigned long old, unsigned long new);
|
||||
#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
|
||||
|
||||
/* 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;
|
||||
}
|
||||
|
||||
#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_uncached_handler (unsigned long offset, void *addr, unsigned long len);
|
||||
|
|
|
|||
Loading…
Reference in New Issue