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arm64: cpufeature: add Neoverse-V3AE to BBML2 allow list

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Neoverse-V3AE advertises support for BBML2 and is known to not raise
conflict aborts. So add it to the BBML2_NOABORT allow list.

However, just like Neoverse-V3, Neoverse-V3AE r0p0 and r0p1 suffer from
erratum #3053180, for which the workaround is to always observe
break-before-make requirements for affected revisions. Therefore only
add to the allow list from r0p2 onwards.

For more details see Software Developer Errata Notice (SDEN) document:
    Neoverse V3AE (MP172) SDEN v9.0, erratum 3053180
    https://developer.arm.com/documentation/SDEN-2615521/9-0/

Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Ryan Roberts
2025-09-19 15:58:30 +01:00
committed by Will Deacon
parent 0c33aa1804
commit 8fca3852e3
1 changed files with 1 additions and 0 deletions
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arch/arm64/kernel/cpufeature.c
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@@ -2235,6 +2235,7 @@ static bool has_bbml2_noabort(const struct arm64_cpu_capabilities *caps, int sco
static const struct midr_range supports_bbml2_noabort_list[] = {
MIDR_REV_RANGE(MIDR_CORTEX_X4, 0, 3, 0xf),
MIDR_REV_RANGE(MIDR_NEOVERSE_V3, 0, 2, 0xf),
MIDR_REV_RANGE(MIDR_NEOVERSE_V3AE, 0, 2, 0xf),
MIDR_ALL_VERSIONS(MIDR_NVIDIA_OLYMPUS),
MIDR_ALL_VERSIONS(MIDR_AMPERE1),
MIDR_ALL_VERSIONS(MIDR_AMPERE1A),