diff options
| author | Will Deacon <will.deacon@arm.com> | 2016-02-02 12:46:24 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-02-16 15:12:32 +0000 |
| commit | d5370f754875460662abe8561388e019d90dd0c4 (patch) | |
| tree | e0d0dc7b42147bd44ba5b7c3c5882b484cf8d9a9 /arch/arm64/include/asm/cpufeature.h | |
| parent | cd5e10bdf3795d22f10787bb1991c43798c885d5 (diff) | |
arm64: prefetch: add alternative pattern for CPUs without a prefetcher
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>
Diffstat (limited to 'arch/arm64/include/asm/cpufeature.h')
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 8f271b83f910..8d56bd8550dc 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -30,8 +30,9 @@ #define ARM64_HAS_LSE_ATOMICS 5 #define ARM64_WORKAROUND_CAVIUM_23154 6 #define ARM64_WORKAROUND_834220 7 +#define ARM64_HAS_NO_HW_PREFETCH 8 -#define ARM64_NCAPS 8 +#define ARM64_NCAPS 9 #ifndef __ASSEMBLY__ |