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    Subject[PATCH v2 05/18] arm64: cpu_errata: Add capability to advertise Cortex-A73 erratum 858921
    Date
    In order to work around Cortex-A73 erratum 858921 in a subsequent
    patch, add the required capability that advertise the erratum.

    As the configuration option it depends on is not present yet,
    this has no immediate effect.

    Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
    ---
    Documentation/arm64/silicon-errata.txt | 1 +
    arch/arm64/include/asm/cpucaps.h | 3 ++-
    arch/arm64/kernel/cpu_errata.c | 8 ++++++++
    3 files changed, 11 insertions(+), 1 deletion(-)

    diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt
    index 2f66683500b8..10f2dddbf449 100644
    --- a/Documentation/arm64/silicon-errata.txt
    +++ b/Documentation/arm64/silicon-errata.txt
    @@ -54,6 +54,7 @@ stable kernels.
    | ARM | Cortex-A57 | #852523 | N/A |
    | ARM | Cortex-A57 | #834220 | ARM64_ERRATUM_834220 |
    | ARM | Cortex-A72 | #853709 | N/A |
    +| ARM | Cortex-A73 | #858921 | ARM64_ERRATUM_858921 |
    | ARM | MMU-500 | #841119,#826419 | N/A |
    | | | | |
    | Cavium | ThunderX ITS | #22375, #24313 | CAVIUM_ERRATUM_22375 |
    diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h
    index fb78a5d3b60b..b3aab8a17868 100644
    --- a/arch/arm64/include/asm/cpucaps.h
    +++ b/arch/arm64/include/asm/cpucaps.h
    @@ -37,7 +37,8 @@
    #define ARM64_HAS_NO_FPSIMD 16
    #define ARM64_WORKAROUND_REPEAT_TLBI 17
    #define ARM64_WORKAROUND_QCOM_FALKOR_E1003 18
    +#define ARM64_WORKAROUND_858921 19

    -#define ARM64_NCAPS 19
    +#define ARM64_NCAPS 20

    #endif /* __ASM_CPUCAPS_H */
    diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
    index 2be1d1c05303..2ed2a7657711 100644
    --- a/arch/arm64/kernel/cpu_errata.c
    +++ b/arch/arm64/kernel/cpu_errata.c
    @@ -158,6 +158,14 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
    MIDR_CPU_VAR_REV(0, 0)),
    },
    #endif
    +#ifdef CONFIG_ARM64_ERRATUM_858921
    + {
    + /* Cortex-A73 all versions */
    + .desc = "ARM erratum 858921",
    + .capability = ARM64_WORKAROUND_858921,
    + MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
    + },
    +#endif
    {
    }
    };
    --
    2.11.0
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