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arm64: cpufeature: List early Cortex-A510 parts as having broken dbm

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Versions of Cortex-A510 before r0p3 are affected by a hardware erratum
where the hardware update of the dirty bit is not correctly ordered.

Add these cpus to the cpu_has_broken_dbm list.

Signed-off-by: James Morse <james.morse@arm.com>
Link: https://lore.kernel.org/r/20220125154040.549272-3-james.morse@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
James Morse 2022-01-25 15:40:40 +00:00 committed by Catalin Marinas
parent df20597044
commit 297ae1eb23
3 changed files with 15 additions and 0 deletions
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2
Documentation/arm64/silicon-errata.rst
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@ -98,6 +98,8 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Cortex-A77 | #1508412 | ARM64_ERRATUM_1508412 |
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Cortex-A510 | #2051678 | ARM64_ERRATUM_2051678 |
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Cortex-A710 | #2119858 | ARM64_ERRATUM_2119858 |
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Cortex-A710 | #2054223 | ARM64_ERRATUM_2054223 |

10
arch/arm64/Kconfig
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@ -670,6 +670,16 @@ config ARM64_ERRATUM_1508412
config ARM64_WORKAROUND_TRBE_OVERWRITE_FILL_MODE
bool
config ARM64_ERRATUM_2051678
bool "Cortex-A510: 2051678: disable Hardware Update of the page table dirty bit"
help
This options adds the workaround for ARM Cortex-A510 erratum ARM64_ERRATUM_2051678.
Affected Coretex-A510 might not respect the ordering rules for
hardware update of the page table's dirty bit. The workaround
is to not enable the feature on affected CPUs.
If unsure, say Y.
config ARM64_ERRATUM_2119858
bool "Cortex-A710/X2: 2119858: workaround TRBE overwriting trace data in FILL mode"
default y

3
arch/arm64/kernel/cpufeature.c
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@ -1645,6 +1645,9 @@ static bool cpu_has_broken_dbm(void)
MIDR_ALL_VERSIONS(MIDR_CORTEX_A55),
/* Kryo4xx Silver (rdpe => r1p0) */
MIDR_REV(MIDR_QCOM_KRYO_4XX_SILVER, 0xd, 0xe),
#endif
#ifdef CONFIG_ARM64_ERRATUM_2051678
MIDR_REV_RANGE(MIDR_CORTEX_A510, 0, 0, 2),
#endif
{},
};