From 09d4e0edd4614e787393acc582ac701c6ec3565b Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Fri, 12 Jun 2009 21:10:05 +0000 Subject: lib: Provide generic atomic64_t implementation Many processor architectures have no 64-bit atomic instructions, but we need atomic64_t in order to support the perf_counter subsystem. This adds an implementation of 64-bit atomic operations using hashed spinlocks to provide atomicity. For each atomic operation, the address of the atomic64_t variable is hashed to an index into an array of 16 spinlocks. That spinlock is taken (with interrupts disabled) around the operation, which can then be coded non-atomically within the lock. On UP, all the spinlock manipulation goes away and we simply disable interrupts around each operation. In fact gcc eliminates the whole atomic64_lock variable as well. Signed-off-by: Paul Mackerras Signed-off-by: Benjamin Herrenschmidt --- include/asm-generic/atomic64.h | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 include/asm-generic/atomic64.h (limited to 'include/asm-generic/atomic64.h') diff --git a/include/asm-generic/atomic64.h b/include/asm-generic/atomic64.h new file mode 100644 index 000000000000..b18ce4f9ee3d --- /dev/null +++ b/include/asm-generic/atomic64.h @@ -0,0 +1,42 @@ +/* + * Generic implementation of 64-bit atomics using spinlocks, + * useful on processors that don't have 64-bit atomic instructions. + * + * Copyright © 2009 Paul Mackerras, IBM Corp. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ +#ifndef _ASM_GENERIC_ATOMIC64_H +#define _ASM_GENERIC_ATOMIC64_H + +typedef struct { + long long counter; +} atomic64_t; + +#define ATOMIC64_INIT(i) { (i) } + +extern long long atomic64_read(const atomic64_t *v); +extern void atomic64_set(atomic64_t *v, long long i); +extern void atomic64_add(long long a, atomic64_t *v); +extern long long atomic64_add_return(long long a, atomic64_t *v); +extern void atomic64_sub(long long a, atomic64_t *v); +extern long long atomic64_sub_return(long long a, atomic64_t *v); +extern long long atomic64_dec_if_positive(atomic64_t *v); +extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n); +extern long long atomic64_xchg(atomic64_t *v, long long new); +extern int atomic64_add_unless(atomic64_t *v, long long a, long long u); + +#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) +#define atomic64_inc(v) atomic64_add(1LL, (v)) +#define atomic64_inc_return(v) atomic64_add_return(1LL, (v)) +#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) +#define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0) +#define atomic64_dec(v) atomic64_sub(1LL, (v)) +#define atomic64_dec_return(v) atomic64_sub_return(1LL, (v)) +#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0) +#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL) + +#endif /* _ASM_GENERIC_ATOMIC64_H */ -- cgit v1.2.3