4ffc2276e2
rte_cldemote is similar to a prefetch hint - in reverse. On x86, cldemote(addr) enables software to hint to hardware that line is likely to be shared. This is quite useful in core-to-core communications where cache-line is likely to be shared. ARM and PPC implementation is provided with NOP and can be added if any equivalent instructions could be used for implementation on those architectures. Signed-off-by: Omkar Maslekar <omkar.maslekar@intel.com> Acked-by: Bruce Richardson <bruce.richardson@intel.com> Acked-by: David Christensen <drc@linux.vnet.ibm.com> Acked-by: Jerin Jacob <jerinj@marvell.com> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
48 lines
893 B
C
48 lines
893 B
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2015 RehiveTech. All rights reserved.
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*/
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#ifndef _RTE_PREFETCH_ARM32_H_
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#define _RTE_PREFETCH_ARM32_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <rte_common.h>
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#include "generic/rte_prefetch.h"
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static inline void rte_prefetch0(const volatile void *p)
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{
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asm volatile ("pld [%0]" : : "r" (p));
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}
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static inline void rte_prefetch1(const volatile void *p)
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{
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asm volatile ("pld [%0]" : : "r" (p));
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}
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static inline void rte_prefetch2(const volatile void *p)
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{
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asm volatile ("pld [%0]" : : "r" (p));
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}
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static inline void rte_prefetch_non_temporal(const volatile void *p)
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{
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/* non-temporal version not available, fallback to rte_prefetch0 */
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rte_prefetch0(p);
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}
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__rte_experimental
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static inline void
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rte_cldemote(const volatile void *p)
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{
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RTE_SET_USED(p);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RTE_PREFETCH_ARM32_H_ */
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