[PATCH v3 3/6] arm64: cpufeature: Extend bbml2_noabort support list

[Linu Cherian]

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@xxxxxxx>
---
 Documentation/arch/arm64/silicon-errata.rst |  4 ++++
 arch/arm64/kernel/cpufeature.c              | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/Documentation/arch/arm64/silicon-errata.rst b/Documentation/arch/arm64/silicon-errata.rst
index 014aa1c215a1..57c778446936 100644
--- a/Documentation/arch/arm64/silicon-errata.rst
+++ b/Documentation/arch/arm64/silicon-errata.rst
@@ -242,10 +242,14 @@ stable kernels.
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | Neoverse-V3AE   | #4193784        | ARM64_ERRATUM_4118414       |
 +----------------+-----------------+-----------------+-----------------------------+
+| ARM            | C1-Premium      | #3683289        | N/A                         |
++----------------+-----------------+-----------------+-----------------------------+
 | ARM            | C1-Premium      | #4193780        | ARM64_ERRATUM_4118414       |
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | C1-Pro          | #4193714        | ARM64_ERRATUM_4193714       |
 +----------------+-----------------+-----------------+-----------------------------+
+| ARM            | C1-Ultra        | #3683289        | N/A                         |
++----------------+-----------------+-----------------+-----------------------------+
 | ARM            | C1-Ultra        | #4193780        | ARM64_ERRATUM_4118414       |
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | MMU-500         | #562869,        | ARM_SMMU_MMU_500_CPRE_ERRATA|
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 9a22df0c5120..1b804b6c4fe0 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2152,6 +2152,16 @@ 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),
+		/* Erratum 3683289 fixed in r1p1 */
+		MIDR_REV_RANGE(MIDR_C1_ULTRA, 1, 1, 0xf),
+		MIDR_REV_RANGE(MIDR_C1_PREMIUM, 1, 1, 0xf),
 		{}
 	};
 
-- 
2.43.0