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ARC: atomics: disintegrate header
Non functional change, to ease future addition/removal Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
This commit is contained in:
Vineet Gupta
parent
6b5ff0405e
commit
b0f839b4b9
103
arch/arc/include/asm/atomic-llsc.h
Normal file
103
arch/arc/include/asm/atomic-llsc.h
Normal file
@ -0,0 +1,103 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _ASM_ARC_ATOMIC_LLSC_H
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#define _ASM_ARC_ATOMIC_LLSC_H
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#define arch_atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
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#define ATOMIC_OP(op, c_op, asm_op) \
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static inline void arch_atomic_##op(int i, atomic_t *v) \
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{ \
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unsigned int val; \
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\
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__asm__ __volatile__( \
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"1: llock %[val], [%[ctr]] \n" \
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" " #asm_op " %[val], %[val], %[i] \n" \
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" scond %[val], [%[ctr]] \n" \
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" bnz 1b \n" \
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: [val] "=&r" (val) /* Early clobber to prevent reg reuse */ \
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: [ctr] "r" (&v->counter), /* Not "m": llock only supports reg direct addr mode */ \
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[i] "ir" (i) \
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: "cc"); \
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} \
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#define ATOMIC_OP_RETURN(op, c_op, asm_op) \
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static inline int arch_atomic_##op##_return(int i, atomic_t *v) \
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{ \
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unsigned int val; \
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\
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/* \
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* Explicit full memory barrier needed before/after as \
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* LLOCK/SCOND themselves don't provide any such semantics \
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*/ \
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smp_mb(); \
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\
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__asm__ __volatile__( \
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"1: llock %[val], [%[ctr]] \n" \
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" " #asm_op " %[val], %[val], %[i] \n" \
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" scond %[val], [%[ctr]] \n" \
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" bnz 1b \n" \
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: [val] "=&r" (val) \
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: [ctr] "r" (&v->counter), \
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[i] "ir" (i) \
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: "cc"); \
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\
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smp_mb(); \
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\
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return val; \
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}
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#define ATOMIC_FETCH_OP(op, c_op, asm_op) \
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static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \
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{ \
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unsigned int val, orig; \
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\
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/* \
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* Explicit full memory barrier needed before/after as \
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* LLOCK/SCOND themselves don't provide any such semantics \
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*/ \
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smp_mb(); \
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\
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__asm__ __volatile__( \
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"1: llock %[orig], [%[ctr]] \n" \
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" " #asm_op " %[val], %[orig], %[i] \n" \
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" scond %[val], [%[ctr]] \n" \
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" bnz 1b \n" \
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: [val] "=&r" (val), \
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[orig] "=&r" (orig) \
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: [ctr] "r" (&v->counter), \
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[i] "ir" (i) \
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: "cc"); \
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\
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smp_mb(); \
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\
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return orig; \
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}
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#define ATOMIC_OPS(op, c_op, asm_op) \
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ATOMIC_OP(op, c_op, asm_op) \
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ATOMIC_OP_RETURN(op, c_op, asm_op) \
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ATOMIC_FETCH_OP(op, c_op, asm_op)
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ATOMIC_OPS(add, +=, add)
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ATOMIC_OPS(sub, -=, sub)
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#undef ATOMIC_OPS
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#define ATOMIC_OPS(op, c_op, asm_op) \
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ATOMIC_OP(op, c_op, asm_op) \
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ATOMIC_FETCH_OP(op, c_op, asm_op)
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ATOMIC_OPS(and, &=, and)
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ATOMIC_OPS(andnot, &= ~, bic)
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ATOMIC_OPS(or, |=, or)
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ATOMIC_OPS(xor, ^=, xor)
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#define arch_atomic_andnot arch_atomic_andnot
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#define arch_atomic_fetch_andnot arch_atomic_fetch_andnot
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#undef ATOMIC_OPS
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#undef ATOMIC_FETCH_OP
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#undef ATOMIC_OP_RETURN
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#undef ATOMIC_OP
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#endif
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111
arch/arc/include/asm/atomic-spinlock.h
Normal file
111
arch/arc/include/asm/atomic-spinlock.h
Normal file
@ -0,0 +1,111 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _ASM_ARC_ATOMIC_SPLOCK_H
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#define _ASM_ARC_ATOMIC_SPLOCK_H
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#ifndef CONFIG_SMP
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/* violating atomic_xxx API locking protocol in UP for optimization sake */
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#define arch_atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
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#else
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static inline void arch_atomic_set(atomic_t *v, int i)
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{
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/*
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* Independent of hardware support, all of the atomic_xxx() APIs need
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* to follow the same locking rules to make sure that a "hardware"
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* atomic insn (e.g. LD) doesn't clobber an "emulated" atomic insn
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* sequence
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*
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* Thus atomic_set() despite being 1 insn (and seemingly atomic)
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* requires the locking.
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*/
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unsigned long flags;
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atomic_ops_lock(flags);
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WRITE_ONCE(v->counter, i);
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atomic_ops_unlock(flags);
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}
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#define arch_atomic_set_release(v, i) arch_atomic_set((v), (i))
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#endif
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/*
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* Non hardware assisted Atomic-R-M-W
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* Locking would change to irq-disabling only (UP) and spinlocks (SMP)
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*/
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#define ATOMIC_OP(op, c_op, asm_op) \
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static inline void arch_atomic_##op(int i, atomic_t *v) \
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{ \
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unsigned long flags; \
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\
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atomic_ops_lock(flags); \
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v->counter c_op i; \
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atomic_ops_unlock(flags); \
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}
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#define ATOMIC_OP_RETURN(op, c_op, asm_op) \
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static inline int arch_atomic_##op##_return(int i, atomic_t *v) \
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{ \
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unsigned long flags; \
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unsigned long temp; \
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\
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/* \
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* spin lock/unlock provides the needed smp_mb() before/after \
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*/ \
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atomic_ops_lock(flags); \
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temp = v->counter; \
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temp c_op i; \
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v->counter = temp; \
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atomic_ops_unlock(flags); \
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\
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return temp; \
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}
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#define ATOMIC_FETCH_OP(op, c_op, asm_op) \
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static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \
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{ \
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unsigned long flags; \
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unsigned long orig; \
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\
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/* \
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* spin lock/unlock provides the needed smp_mb() before/after \
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*/ \
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atomic_ops_lock(flags); \
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orig = v->counter; \
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v->counter c_op i; \
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atomic_ops_unlock(flags); \
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\
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return orig; \
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}
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#define ATOMIC_OPS(op, c_op, asm_op) \
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ATOMIC_OP(op, c_op, asm_op) \
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ATOMIC_OP_RETURN(op, c_op, asm_op) \
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ATOMIC_FETCH_OP(op, c_op, asm_op)
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ATOMIC_OPS(add, +=, add)
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ATOMIC_OPS(sub, -=, sub)
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#undef ATOMIC_OPS
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#define ATOMIC_OPS(op, c_op, asm_op) \
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ATOMIC_OP(op, c_op, asm_op) \
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ATOMIC_FETCH_OP(op, c_op, asm_op)
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ATOMIC_OPS(and, &=, and)
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ATOMIC_OPS(andnot, &= ~, bic)
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ATOMIC_OPS(or, |=, or)
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ATOMIC_OPS(xor, ^=, xor)
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#define arch_atomic_andnot arch_atomic_andnot
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#define arch_atomic_fetch_andnot arch_atomic_fetch_andnot
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#undef ATOMIC_OPS
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#undef ATOMIC_FETCH_OP
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#undef ATOMIC_OP_RETURN
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#undef ATOMIC_OP
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#endif
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@ -17,435 +17,16 @@
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#define arch_atomic_read(v) READ_ONCE((v)->counter)
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#ifdef CONFIG_ARC_HAS_LLSC
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#define arch_atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
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#define ATOMIC_OP(op, c_op, asm_op) \
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static inline void arch_atomic_##op(int i, atomic_t *v) \
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{ \
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unsigned int val; \
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\
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__asm__ __volatile__( \
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"1: llock %[val], [%[ctr]] \n" \
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" " #asm_op " %[val], %[val], %[i] \n" \
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" scond %[val], [%[ctr]] \n" \
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" bnz 1b \n" \
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: [val] "=&r" (val) /* Early clobber to prevent reg reuse */ \
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: [ctr] "r" (&v->counter), /* Not "m": llock only supports reg direct addr mode */ \
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[i] "ir" (i) \
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: "cc"); \
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} \
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#define ATOMIC_OP_RETURN(op, c_op, asm_op) \
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static inline int arch_atomic_##op##_return(int i, atomic_t *v) \
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{ \
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unsigned int val; \
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\
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/* \
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* Explicit full memory barrier needed before/after as \
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* LLOCK/SCOND themselves don't provide any such semantics \
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*/ \
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smp_mb(); \
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\
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__asm__ __volatile__( \
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"1: llock %[val], [%[ctr]] \n" \
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" " #asm_op " %[val], %[val], %[i] \n" \
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" scond %[val], [%[ctr]] \n" \
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" bnz 1b \n" \
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: [val] "=&r" (val) \
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: [ctr] "r" (&v->counter), \
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[i] "ir" (i) \
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: "cc"); \
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\
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smp_mb(); \
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\
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return val; \
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}
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#define ATOMIC_FETCH_OP(op, c_op, asm_op) \
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static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \
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{ \
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unsigned int val, orig; \
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\
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/* \
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* Explicit full memory barrier needed before/after as \
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* LLOCK/SCOND themselves don't provide any such semantics \
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*/ \
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smp_mb(); \
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\
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__asm__ __volatile__( \
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"1: llock %[orig], [%[ctr]] \n" \
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" " #asm_op " %[val], %[orig], %[i] \n" \
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" scond %[val], [%[ctr]] \n" \
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" bnz 1b \n" \
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: [val] "=&r" (val), \
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[orig] "=&r" (orig) \
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: [ctr] "r" (&v->counter), \
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[i] "ir" (i) \
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: "cc"); \
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\
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smp_mb(); \
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\
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return orig; \
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}
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#else /* !CONFIG_ARC_HAS_LLSC */
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#ifndef CONFIG_SMP
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/* violating atomic_xxx API locking protocol in UP for optimization sake */
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#define arch_atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
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#include <asm/atomic-llsc.h>
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#else
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static inline void arch_atomic_set(atomic_t *v, int i)
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{
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/*
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* Independent of hardware support, all of the atomic_xxx() APIs need
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* to follow the same locking rules to make sure that a "hardware"
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* atomic insn (e.g. LD) doesn't clobber an "emulated" atomic insn
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* sequence
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*
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* Thus atomic_set() despite being 1 insn (and seemingly atomic)
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* requires the locking.
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*/
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unsigned long flags;
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atomic_ops_lock(flags);
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WRITE_ONCE(v->counter, i);
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atomic_ops_unlock(flags);
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}
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#define arch_atomic_set_release(v, i) arch_atomic_set((v), (i))
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#include <asm/atomic-spinlock.h>
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#endif
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/*
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* Non hardware assisted Atomic-R-M-W
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* Locking would change to irq-disabling only (UP) and spinlocks (SMP)
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*/
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#define ATOMIC_OP(op, c_op, asm_op) \
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static inline void arch_atomic_##op(int i, atomic_t *v) \
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{ \
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unsigned long flags; \
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\
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atomic_ops_lock(flags); \
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v->counter c_op i; \
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atomic_ops_unlock(flags); \
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}
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#define ATOMIC_OP_RETURN(op, c_op, asm_op) \
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static inline int arch_atomic_##op##_return(int i, atomic_t *v) \
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{ \
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unsigned long flags; \
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unsigned long temp; \
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\
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/* \
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* spin lock/unlock provides the needed smp_mb() before/after \
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*/ \
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atomic_ops_lock(flags); \
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temp = v->counter; \
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temp c_op i; \
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v->counter = temp; \
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atomic_ops_unlock(flags); \
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\
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return temp; \
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}
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#define ATOMIC_FETCH_OP(op, c_op, asm_op) \
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static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \
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{ \
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unsigned long flags; \
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unsigned long orig; \
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\
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/* \
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* spin lock/unlock provides the needed smp_mb() before/after \
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*/ \
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atomic_ops_lock(flags); \
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orig = v->counter; \
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v->counter c_op i; \
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atomic_ops_unlock(flags); \
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\
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return orig; \
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}
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#endif /* !CONFIG_ARC_HAS_LLSC */
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#define ATOMIC_OPS(op, c_op, asm_op) \
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ATOMIC_OP(op, c_op, asm_op) \
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ATOMIC_OP_RETURN(op, c_op, asm_op) \
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ATOMIC_FETCH_OP(op, c_op, asm_op)
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ATOMIC_OPS(add, +=, add)
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ATOMIC_OPS(sub, -=, sub)
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#undef ATOMIC_OPS
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#define ATOMIC_OPS(op, c_op, asm_op) \
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ATOMIC_OP(op, c_op, asm_op) \
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ATOMIC_FETCH_OP(op, c_op, asm_op)
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ATOMIC_OPS(and, &=, and)
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ATOMIC_OPS(andnot, &= ~, bic)
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ATOMIC_OPS(or, |=, or)
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ATOMIC_OPS(xor, ^=, xor)
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#define arch_atomic_andnot arch_atomic_andnot
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#define arch_atomic_fetch_andnot arch_atomic_fetch_andnot
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#undef ATOMIC_OPS
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#undef ATOMIC_FETCH_OP
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#undef ATOMIC_OP_RETURN
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#undef ATOMIC_OP
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#ifdef CONFIG_GENERIC_ATOMIC64
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#include <asm-generic/atomic64.h>
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#else /* Kconfig ensures this is only enabled with needed h/w assist */
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/*
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* ARCv2 supports 64-bit exclusive load (LLOCKD) / store (SCONDD)
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* - The address HAS to be 64-bit aligned
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* - There are 2 semantics involved here:
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* = exclusive implies no interim update between load/store to same addr
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* = both words are observed/updated together: this is guaranteed even
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* for regular 64-bit load (LDD) / store (STD). Thus atomic64_set()
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* is NOT required to use LLOCKD+SCONDD, STD suffices
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*/
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typedef struct {
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s64 __aligned(8) counter;
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} atomic64_t;
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#define ATOMIC64_INIT(a) { (a) }
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static inline s64 arch_atomic64_read(const atomic64_t *v)
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{
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s64 val;
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__asm__ __volatile__(
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" ldd %0, [%1] \n"
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: "=r"(val)
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: "r"(&v->counter));
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return val;
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}
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static inline void arch_atomic64_set(atomic64_t *v, s64 a)
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{
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/*
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* This could have been a simple assignment in "C" but would need
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* explicit volatile. Otherwise gcc optimizers could elide the store
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* which borked atomic64 self-test
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* In the inline asm version, memory clobber needed for exact same
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* reason, to tell gcc about the store.
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*
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* This however is not needed for sibling atomic64_add() etc since both
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* load/store are explicitly done in inline asm. As long as API is used
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* for each access, gcc has no way to optimize away any load/store
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*/
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__asm__ __volatile__(
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" std %0, [%1] \n"
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:
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: "r"(a), "r"(&v->counter)
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: "memory");
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}
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#define ATOMIC64_OP(op, op1, op2) \
|
||||
static inline void arch_atomic64_##op(s64 a, atomic64_t *v) \
|
||||
{ \
|
||||
s64 val; \
|
||||
\
|
||||
__asm__ __volatile__( \
|
||||
"1: \n" \
|
||||
" llockd %0, [%1] \n" \
|
||||
" " #op1 " %L0, %L0, %L2 \n" \
|
||||
" " #op2 " %H0, %H0, %H2 \n" \
|
||||
" scondd %0, [%1] \n" \
|
||||
" bnz 1b \n" \
|
||||
: "=&r"(val) \
|
||||
: "r"(&v->counter), "ir"(a) \
|
||||
: "cc"); \
|
||||
} \
|
||||
|
||||
#define ATOMIC64_OP_RETURN(op, op1, op2) \
|
||||
static inline s64 arch_atomic64_##op##_return(s64 a, atomic64_t *v) \
|
||||
{ \
|
||||
s64 val; \
|
||||
\
|
||||
smp_mb(); \
|
||||
\
|
||||
__asm__ __volatile__( \
|
||||
"1: \n" \
|
||||
" llockd %0, [%1] \n" \
|
||||
" " #op1 " %L0, %L0, %L2 \n" \
|
||||
" " #op2 " %H0, %H0, %H2 \n" \
|
||||
" scondd %0, [%1] \n" \
|
||||
" bnz 1b \n" \
|
||||
: [val] "=&r"(val) \
|
||||
: "r"(&v->counter), "ir"(a) \
|
||||
: "cc"); /* memory clobber comes from smp_mb() */ \
|
||||
\
|
||||
smp_mb(); \
|
||||
\
|
||||
return val; \
|
||||
}
|
||||
|
||||
#define ATOMIC64_FETCH_OP(op, op1, op2) \
|
||||
static inline s64 arch_atomic64_fetch_##op(s64 a, atomic64_t *v) \
|
||||
{ \
|
||||
s64 val, orig; \
|
||||
\
|
||||
smp_mb(); \
|
||||
\
|
||||
__asm__ __volatile__( \
|
||||
"1: \n" \
|
||||
" llockd %0, [%2] \n" \
|
||||
" " #op1 " %L1, %L0, %L3 \n" \
|
||||
" " #op2 " %H1, %H0, %H3 \n" \
|
||||
" scondd %1, [%2] \n" \
|
||||
" bnz 1b \n" \
|
||||
: "=&r"(orig), "=&r"(val) \
|
||||
: "r"(&v->counter), "ir"(a) \
|
||||
: "cc"); /* memory clobber comes from smp_mb() */ \
|
||||
\
|
||||
smp_mb(); \
|
||||
\
|
||||
return orig; \
|
||||
}
|
||||
|
||||
#define ATOMIC64_OPS(op, op1, op2) \
|
||||
ATOMIC64_OP(op, op1, op2) \
|
||||
ATOMIC64_OP_RETURN(op, op1, op2) \
|
||||
ATOMIC64_FETCH_OP(op, op1, op2)
|
||||
|
||||
ATOMIC64_OPS(add, add.f, adc)
|
||||
ATOMIC64_OPS(sub, sub.f, sbc)
|
||||
ATOMIC64_OPS(and, and, and)
|
||||
ATOMIC64_OPS(andnot, bic, bic)
|
||||
ATOMIC64_OPS(or, or, or)
|
||||
ATOMIC64_OPS(xor, xor, xor)
|
||||
|
||||
#define arch_atomic64_andnot arch_atomic64_andnot
|
||||
#define arch_atomic64_fetch_andnot arch_atomic64_fetch_andnot
|
||||
|
||||
#undef ATOMIC64_OPS
|
||||
#undef ATOMIC64_FETCH_OP
|
||||
#undef ATOMIC64_OP_RETURN
|
||||
#undef ATOMIC64_OP
|
||||
|
||||
static inline s64
|
||||
arch_atomic64_cmpxchg(atomic64_t *ptr, s64 expected, s64 new)
|
||||
{
|
||||
s64 prev;
|
||||
|
||||
smp_mb();
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: llockd %0, [%1] \n"
|
||||
" brne %L0, %L2, 2f \n"
|
||||
" brne %H0, %H2, 2f \n"
|
||||
" scondd %3, [%1] \n"
|
||||
" bnz 1b \n"
|
||||
"2: \n"
|
||||
: "=&r"(prev)
|
||||
: "r"(ptr), "ir"(expected), "r"(new)
|
||||
: "cc"); /* memory clobber comes from smp_mb() */
|
||||
|
||||
smp_mb();
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
static inline s64 arch_atomic64_xchg(atomic64_t *ptr, s64 new)
|
||||
{
|
||||
s64 prev;
|
||||
|
||||
smp_mb();
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: llockd %0, [%1] \n"
|
||||
" scondd %2, [%1] \n"
|
||||
" bnz 1b \n"
|
||||
"2: \n"
|
||||
: "=&r"(prev)
|
||||
: "r"(ptr), "r"(new)
|
||||
: "cc"); /* memory clobber comes from smp_mb() */
|
||||
|
||||
smp_mb();
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
/**
|
||||
* arch_atomic64_dec_if_positive - decrement by 1 if old value positive
|
||||
* @v: pointer of type atomic64_t
|
||||
*
|
||||
* The function returns the old value of *v minus 1, even if
|
||||
* the atomic variable, v, was not decremented.
|
||||
*/
|
||||
|
||||
static inline s64 arch_atomic64_dec_if_positive(atomic64_t *v)
|
||||
{
|
||||
s64 val;
|
||||
|
||||
smp_mb();
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: llockd %0, [%1] \n"
|
||||
" sub.f %L0, %L0, 1 # w0 - 1, set C on borrow\n"
|
||||
" sub.c %H0, %H0, 1 # if C set, w1 - 1\n"
|
||||
" brlt %H0, 0, 2f \n"
|
||||
" scondd %0, [%1] \n"
|
||||
" bnz 1b \n"
|
||||
"2: \n"
|
||||
: "=&r"(val)
|
||||
: "r"(&v->counter)
|
||||
: "cc"); /* memory clobber comes from smp_mb() */
|
||||
|
||||
smp_mb();
|
||||
|
||||
return val;
|
||||
}
|
||||
#define arch_atomic64_dec_if_positive arch_atomic64_dec_if_positive
|
||||
|
||||
/**
|
||||
* arch_atomic64_fetch_add_unless - add unless the number is a given value
|
||||
* @v: pointer of type atomic64_t
|
||||
* @a: the amount to add to v...
|
||||
* @u: ...unless v is equal to u.
|
||||
*
|
||||
* Atomically adds @a to @v, if it was not @u.
|
||||
* Returns the old value of @v
|
||||
*/
|
||||
static inline s64 arch_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
|
||||
{
|
||||
s64 old, temp;
|
||||
|
||||
smp_mb();
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: llockd %0, [%2] \n"
|
||||
" brne %L0, %L4, 2f # continue to add since v != u \n"
|
||||
" breq.d %H0, %H4, 3f # return since v == u \n"
|
||||
"2: \n"
|
||||
" add.f %L1, %L0, %L3 \n"
|
||||
" adc %H1, %H0, %H3 \n"
|
||||
" scondd %1, [%2] \n"
|
||||
" bnz 1b \n"
|
||||
"3: \n"
|
||||
: "=&r"(old), "=&r" (temp)
|
||||
: "r"(&v->counter), "r"(a), "r"(u)
|
||||
: "cc"); /* memory clobber comes from smp_mb() */
|
||||
|
||||
smp_mb();
|
||||
|
||||
return old;
|
||||
}
|
||||
#define arch_atomic64_fetch_add_unless arch_atomic64_fetch_add_unless
|
||||
|
||||
#endif /* !CONFIG_GENERIC_ATOMIC64 */
|
||||
#else
|
||||
#include <asm/atomic64-arcv2.h>
|
||||
#endif
|
||||
|
||||
#endif /* !__ASSEMBLY__ */
|
||||
|
||||
|
||||
242
arch/arc/include/asm/atomic64-arcv2.h
Normal file
242
arch/arc/include/asm/atomic64-arcv2.h
Normal file
@ -0,0 +1,242 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0-only */
|
||||
|
||||
/*
|
||||
* ARCv2 supports 64-bit exclusive load (LLOCKD) / store (SCONDD)
|
||||
* - The address HAS to be 64-bit aligned
|
||||
*/
|
||||
|
||||
#ifndef _ASM_ARC_ATOMIC64_ARCV2_H
|
||||
#define _ASM_ARC_ATOMIC64_ARCV2_H
|
||||
|
||||
typedef struct {
|
||||
s64 __aligned(8) counter;
|
||||
} atomic64_t;
|
||||
|
||||
#define ATOMIC64_INIT(a) { (a) }
|
||||
|
||||
static inline s64 arch_atomic64_read(const atomic64_t *v)
|
||||
{
|
||||
s64 val;
|
||||
|
||||
__asm__ __volatile__(
|
||||
" ldd %0, [%1] \n"
|
||||
: "=r"(val)
|
||||
: "r"(&v->counter));
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
static inline void arch_atomic64_set(atomic64_t *v, s64 a)
|
||||
{
|
||||
/*
|
||||
* This could have been a simple assignment in "C" but would need
|
||||
* explicit volatile. Otherwise gcc optimizers could elide the store
|
||||
* which borked atomic64 self-test
|
||||
* In the inline asm version, memory clobber needed for exact same
|
||||
* reason, to tell gcc about the store.
|
||||
*
|
||||
* This however is not needed for sibling atomic64_add() etc since both
|
||||
* load/store are explicitly done in inline asm. As long as API is used
|
||||
* for each access, gcc has no way to optimize away any load/store
|
||||
*/
|
||||
__asm__ __volatile__(
|
||||
" std %0, [%1] \n"
|
||||
:
|
||||
: "r"(a), "r"(&v->counter)
|
||||
: "memory");
|
||||
}
|
||||
|
||||
#define ATOMIC64_OP(op, op1, op2) \
|
||||
static inline void arch_atomic64_##op(s64 a, atomic64_t *v) \
|
||||
{ \
|
||||
s64 val; \
|
||||
\
|
||||
__asm__ __volatile__( \
|
||||
"1: \n" \
|
||||
" llockd %0, [%1] \n" \
|
||||
" " #op1 " %L0, %L0, %L2 \n" \
|
||||
" " #op2 " %H0, %H0, %H2 \n" \
|
||||
" scondd %0, [%1] \n" \
|
||||
" bnz 1b \n" \
|
||||
: "=&r"(val) \
|
||||
: "r"(&v->counter), "ir"(a) \
|
||||
: "cc"); \
|
||||
} \
|
||||
|
||||
#define ATOMIC64_OP_RETURN(op, op1, op2) \
|
||||
static inline s64 arch_atomic64_##op##_return(s64 a, atomic64_t *v) \
|
||||
{ \
|
||||
s64 val; \
|
||||
\
|
||||
smp_mb(); \
|
||||
\
|
||||
__asm__ __volatile__( \
|
||||
"1: \n" \
|
||||
" llockd %0, [%1] \n" \
|
||||
" " #op1 " %L0, %L0, %L2 \n" \
|
||||
" " #op2 " %H0, %H0, %H2 \n" \
|
||||
" scondd %0, [%1] \n" \
|
||||
" bnz 1b \n" \
|
||||
: [val] "=&r"(val) \
|
||||
: "r"(&v->counter), "ir"(a) \
|
||||
: "cc"); /* memory clobber comes from smp_mb() */ \
|
||||
\
|
||||
smp_mb(); \
|
||||
\
|
||||
return val; \
|
||||
}
|
||||
|
||||
#define ATOMIC64_FETCH_OP(op, op1, op2) \
|
||||
static inline s64 arch_atomic64_fetch_##op(s64 a, atomic64_t *v) \
|
||||
{ \
|
||||
s64 val, orig; \
|
||||
\
|
||||
smp_mb(); \
|
||||
\
|
||||
__asm__ __volatile__( \
|
||||
"1: \n" \
|
||||
" llockd %0, [%2] \n" \
|
||||
" " #op1 " %L1, %L0, %L3 \n" \
|
||||
" " #op2 " %H1, %H0, %H3 \n" \
|
||||
" scondd %1, [%2] \n" \
|
||||
" bnz 1b \n" \
|
||||
: "=&r"(orig), "=&r"(val) \
|
||||
: "r"(&v->counter), "ir"(a) \
|
||||
: "cc"); /* memory clobber comes from smp_mb() */ \
|
||||
\
|
||||
smp_mb(); \
|
||||
\
|
||||
return orig; \
|
||||
}
|
||||
|
||||
#define ATOMIC64_OPS(op, op1, op2) \
|
||||
ATOMIC64_OP(op, op1, op2) \
|
||||
ATOMIC64_OP_RETURN(op, op1, op2) \
|
||||
ATOMIC64_FETCH_OP(op, op1, op2)
|
||||
|
||||
ATOMIC64_OPS(add, add.f, adc)
|
||||
ATOMIC64_OPS(sub, sub.f, sbc)
|
||||
ATOMIC64_OPS(and, and, and)
|
||||
ATOMIC64_OPS(andnot, bic, bic)
|
||||
ATOMIC64_OPS(or, or, or)
|
||||
ATOMIC64_OPS(xor, xor, xor)
|
||||
|
||||
#define arch_atomic64_andnot arch_atomic64_andnot
|
||||
#define arch_atomic64_fetch_andnot arch_atomic64_fetch_andnot
|
||||
|
||||
#undef ATOMIC64_OPS
|
||||
#undef ATOMIC64_FETCH_OP
|
||||
#undef ATOMIC64_OP_RETURN
|
||||
#undef ATOMIC64_OP
|
||||
|
||||
static inline s64
|
||||
arch_atomic64_cmpxchg(atomic64_t *ptr, s64 expected, s64 new)
|
||||
{
|
||||
s64 prev;
|
||||
|
||||
smp_mb();
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: llockd %0, [%1] \n"
|
||||
" brne %L0, %L2, 2f \n"
|
||||
" brne %H0, %H2, 2f \n"
|
||||
" scondd %3, [%1] \n"
|
||||
" bnz 1b \n"
|
||||
"2: \n"
|
||||
: "=&r"(prev)
|
||||
: "r"(ptr), "ir"(expected), "r"(new)
|
||||
: "cc"); /* memory clobber comes from smp_mb() */
|
||||
|
||||
smp_mb();
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
static inline s64 arch_atomic64_xchg(atomic64_t *ptr, s64 new)
|
||||
{
|
||||
s64 prev;
|
||||
|
||||
smp_mb();
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: llockd %0, [%1] \n"
|
||||
" scondd %2, [%1] \n"
|
||||
" bnz 1b \n"
|
||||
"2: \n"
|
||||
: "=&r"(prev)
|
||||
: "r"(ptr), "r"(new)
|
||||
: "cc"); /* memory clobber comes from smp_mb() */
|
||||
|
||||
smp_mb();
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
/**
|
||||
* arch_atomic64_dec_if_positive - decrement by 1 if old value positive
|
||||
* @v: pointer of type atomic64_t
|
||||
*
|
||||
* The function returns the old value of *v minus 1, even if
|
||||
* the atomic variable, v, was not decremented.
|
||||
*/
|
||||
|
||||
static inline s64 arch_atomic64_dec_if_positive(atomic64_t *v)
|
||||
{
|
||||
s64 val;
|
||||
|
||||
smp_mb();
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: llockd %0, [%1] \n"
|
||||
" sub.f %L0, %L0, 1 # w0 - 1, set C on borrow\n"
|
||||
" sub.c %H0, %H0, 1 # if C set, w1 - 1\n"
|
||||
" brlt %H0, 0, 2f \n"
|
||||
" scondd %0, [%1] \n"
|
||||
" bnz 1b \n"
|
||||
"2: \n"
|
||||
: "=&r"(val)
|
||||
: "r"(&v->counter)
|
||||
: "cc"); /* memory clobber comes from smp_mb() */
|
||||
|
||||
smp_mb();
|
||||
|
||||
return val;
|
||||
}
|
||||
#define arch_atomic64_dec_if_positive arch_atomic64_dec_if_positive
|
||||
|
||||
/**
|
||||
* arch_atomic64_fetch_add_unless - add unless the number is a given value
|
||||
* @v: pointer of type atomic64_t
|
||||
* @a: the amount to add to v...
|
||||
* @u: ...unless v is equal to u.
|
||||
*
|
||||
* Atomically adds @a to @v, if it was not @u.
|
||||
* Returns the old value of @v
|
||||
*/
|
||||
static inline s64 arch_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
|
||||
{
|
||||
s64 old, temp;
|
||||
|
||||
smp_mb();
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: llockd %0, [%2] \n"
|
||||
" brne %L0, %L4, 2f # continue to add since v != u \n"
|
||||
" breq.d %H0, %H4, 3f # return since v == u \n"
|
||||
"2: \n"
|
||||
" add.f %L1, %L0, %L3 \n"
|
||||
" adc %H1, %H0, %H3 \n"
|
||||
" scondd %1, [%2] \n"
|
||||
" bnz 1b \n"
|
||||
"3: \n"
|
||||
: "=&r"(old), "=&r" (temp)
|
||||
: "r"(&v->counter), "r"(a), "r"(u)
|
||||
: "cc"); /* memory clobber comes from smp_mb() */
|
||||
|
||||
smp_mb();
|
||||
|
||||
return old;
|
||||
}
|
||||
#define arch_atomic64_fetch_add_unless arch_atomic64_fetch_add_unless
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user