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From: Linu Cherian <linu.cherian@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Ryan Roberts <ryan.roberts@arm.com>,
	Kevin Brodsky <kevin.brodsky@arm.com>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Linu Cherian <linu.cherian@arm.com>
Subject: [PATCH v2 3/6] arm64: cpufeature: Extend bbml2_noabort support list
Date: Wed,  8 Jul 2026 20:13:28 +0530	[thread overview]
Message-ID: <20260708144331.679816-4-linu.cherian@arm.com> (raw)
In-Reply-To: <20260708144331.679816-1-linu.cherian@arm.com>

Add below cpus to the midr list, which supports
BBML2_NOABORT.

Cortex A520(AE)
Cortex A715
Cortex A720(AE)
Cortex A725
Neoverse N3
C1-Nano
C1-Pro
C1-Ultra
C1-Premium

C1-Ultra and C1-Premium both suffer from erratum 3683289,
where Break-Before-Make must be followed to avoid a livelock.
For both CPUs, the erratum is fixed from r1p1.
Hence we do not enable BBML2_NOABORT for CPU revisions <= r1p0.

The relevant SDENs are:
* C1-Ultra: https://developer.arm.com/documentation/111077/9-00/
* C1-Premium: https://developer.arm.com/documentation/111078/9-00/

Signed-off-by: Linu Cherian <linu.cherian@arm.com>
---
 arch/arm64/kernel/cpufeature.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 9a22df0c5120..adcabea80fcb 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2152,6 +2152,15 @@ bool cpu_supports_bbml2_noabort(void)
 		MIDR_ALL_VERSIONS(MIDR_NVIDIA_OLYMPUS),
 		MIDR_ALL_VERSIONS(MIDR_AMPERE1),
 		MIDR_ALL_VERSIONS(MIDR_AMPERE1A),
+		MIDR_ALL_VERSIONS(MIDR_CORTEX_A520AE),
+		MIDR_ALL_VERSIONS(MIDR_CORTEX_A715),
+		MIDR_ALL_VERSIONS(MIDR_CORTEX_A720AE),
+		MIDR_ALL_VERSIONS(MIDR_CORTEX_A725),
+		MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N3),
+		MIDR_ALL_VERSIONS(MIDR_C1_NANO),
+		MIDR_ALL_VERSIONS(MIDR_C1_PRO),
+		MIDR_REV_RANGE(MIDR_C1_ULTRA, 1, 1, 0xf),
+		MIDR_REV_RANGE(MIDR_C1_PREMIUM, 1, 1, 0xf),
 		{}
 	};
 
-- 
2.43.0


  parent reply	other threads:[~2026-07-08 14:44 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-08 14:43 [PATCH v2 0/6] Add BBML3 cpu feature Linu Cherian
2026-07-08 14:43 ` [PATCH v2 1/6] arm64: cputype: Add Cortex-A520AE definitions Linu Cherian
2026-07-10  6:37   ` Anshuman Khandual
2026-07-08 14:43 ` [PATCH v2 2/6] arm64: cputype: Add C1-Nano definitions Linu Cherian
2026-07-10  6:37   ` Anshuman Khandual
2026-07-08 14:43 ` Linu Cherian [this message]
2026-07-08 14:53   ` [PATCH v2 3/6] arm64: cpufeature: Extend bbml2_noabort support list Suzuki K Poulose
2026-07-10  6:24     ` Anshuman Khandual
2026-07-08 14:43 ` [PATCH v2 4/6] arm64: sysreg: Add BBM_3 Linu Cherian
2026-07-10  6:46   ` Anshuman Khandual
2026-07-08 14:43 ` [PATCH v2 5/6] arm64: cpufeature: Add BBML3 Linu Cherian
2026-07-10  7:00   ` Anshuman Khandual
2026-07-08 14:43 ` [PATCH v2 6/6] arm64: cpufeature: Detect BBML3 based on MMFR2 ID Linu Cherian
2026-07-10  7:11   ` Anshuman Khandual

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