linux-kernel - [RFC PATCH v6 2/4] arm64: cpufeature: add AmpereOne to BBML2 allow list

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Message-ID: <20250805081350.3854670-3-ryan.roberts@arm.com>
Date: Tue,  5 Aug 2025 09:13:47 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: Yang Shi <yang@...amperecomputing.com>,
	will@...nel.org,
	catalin.marinas@....com,
	akpm@...ux-foundation.org,
	Miko.Lenczewski@....com,
	dev.jain@....com,
	scott@...amperecomputing.com,
	cl@...two.org
Cc: Ryan Roberts <ryan.roberts@....com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH v6 2/4] arm64: cpufeature: add AmpereOne to BBML2 allow list

From: Yang Shi <yang@...amperecomputing.com>

AmpereOne supports BBML2 without conflict abort, add to the allow list.

Signed-off-by: Yang Shi <yang@...amperecomputing.com>
Reviewed-by: Christoph Lameter (Ampere) <cl@...two.org>
Reviewed-by: Ryan Roberts <ryan.roberts@....com>
---
 arch/arm64/kernel/cpufeature.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 9ad065f15f1d..b93f4ee57176 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2234,6 +2234,8 @@ 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_ALL_VERSIONS(MIDR_AMPERE1),
+		MIDR_ALL_VERSIONS(MIDR_AMPERE1A),
 		{}
 	};
 
-- 
2.43.0