From: yangjinqian <yangjinqian1@huawei.com> virt inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IBN3WI ------------------------------------------------------------------------ When errata 162100125 matches, only the MIDR value is checked to see if the CPU matches. It is also important to check whether the CnP in the MMFR2 register is enabled. If CnP is not enabled, this errata is not required. Signed-off-by: Jinqian Yang <yangjinqian1@huawei.com> Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com> --- arch/arm64/include/asm/cpufeature.h | 14 ++++++++++++++ arch/arm64/kernel/cpu_errata.c | 13 ++++++++++++- 2 files changed, 26 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index d68307a50d13..683ebd5b7e96 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -651,6 +651,20 @@ static inline bool cpu_supports_mixed_endian_el0(void) return id_aa64mmfr0_mixed_endian_el0(read_cpuid(ID_AA64MMFR0_EL1)); } +static inline bool supports_cnp(int scope) +{ + u64 mmfr2; + u8 cnp; + + if (scope == SCOPE_LOCAL_CPU) + mmfr2 = read_sysreg_s(SYS_ID_AA64MMFR2_EL1); + else + mmfr2 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR2_EL1); + + cnp = cpuid_feature_extract_unsigned_field(mmfr2, + ID_AA64MMFR2_EL1_CnP_SHIFT); + return cnp == 1; +} static inline bool supports_csv2p3(int scope) { diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 2e5e4052a182..5dc7c36e5820 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -60,6 +60,15 @@ is_kryo_midr(const struct arm64_cpu_capabilities *entry, int scope) return model == entry->midr_range.model; } +#ifdef CONFIG_HISILICON_ERRATUM_162100125 +static bool +hisilicon_162100125_match(const struct arm64_cpu_capabilities *entry, + int scope) +{ + return is_affected_midr_range_list(entry, scope) && supports_cnp(scope); +} +#endif + #ifdef CONFIG_HISILICON_ERRATUM_1980005 static bool hisilicon_1980005_match(const struct arm64_cpu_capabilities *entry, @@ -639,7 +648,9 @@ const struct arm64_cpu_capabilities arm64_errata[] = { { .desc = "Hisilicon erratum 162100125", .capability = ARM64_WORKAROUND_HISILICON_ERRATUM_162100125, - ERRATA_MIDR_RANGE_LIST(hisilicon_erratum_162100125_cpus), + .matches = hisilicon_162100125_match, + .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, + .midr_range_list = hisilicon_erratum_162100125_cpus, }, #endif #ifdef CONFIG_HISILICON_ERRATUM_1980005 -- 2.33.0