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

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>

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index cf2dd5ea173fe48c2beabd79c597ce6645786c54..30244c1f833c1d768552d0757889a57d1b052852 100644 (file)
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -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),