mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-08-31 11:41:29 -04:00
Code Issues Packages Projects Releases Wiki Activity

arm64: cpufeature: Extend bbml2_noabort support list

Browse Source 
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/

Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Linu Cherian <linu.cherian@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Linu Cherian
2026-07-23 10:10:30 +05:30
committed by Will Deacon
parent 357230cb52
commit a7ac604144
2 changed files with 14 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/arch/arm64/silicon-errata.rst
View File

@@ -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|

10
arch/arm64/kernel/cpufeature.c
View File

@@ -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_RANGE(MIDR_C1_ULTRA, 1, 1, 0xf, 0xf),
MIDR_RANGE(MIDR_C1_PREMIUM, 1, 1, 0xf, 0xf),
{}
};