arm64: prefetch: add alternative pattern for CPUs without a prefetcher

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Most CPUs have a hardware prefetcher which generally performs better
without explicit prefetch instructions issued by software, however
some CPUs (e.g. Cavium ThunderX) rely solely on explicit prefetch
instructions.

This patch adds an alternative pattern (ARM64_HAS_NO_HW_PREFETCH) to
allow our library code to make use of explicit prefetch instructions
during things like copy routines only when the CPU does not have the
capability to perform the prefetching itself.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Tested-by: Andrew Pinski <apinski@cavium.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Will Deacon 2016-02-02 12:46:24 +00:00 • committed by Catalin Marinas

parent cd5e10bdf3

commit d5370f7548

4 changed files with 38 additions and 17 deletions

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3

arch/arm64/include/asm/cpufeature.h

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17

arch/arm64/include/asm/cputype.h

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18

arch/arm64/kernel/cpu_errata.c

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17

arch/arm64/kernel/cpufeature.c

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