hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I92AK4 ----------------------------- Both the major version number and the minor version numbers need to be checked to confirm whether the MPAM Extension is supported on the platform. This supports MPAM v0.1 version for cpufeature detection, check [1] for details. [1] https://developer.arm.com/documentation/ddi0595/2021-12/AArch64- Registers/ID-AA64PFR1-EL1--AArch64-Processor-Feature-Register-1?lang=en Fixes: 21771eaaf93a ("arm64: cpufeature: discover CPU support for MPAM") Signed-off-by: Zeng Heng <zengheng4@huawei.com> --- arch/arm64/include/asm/cpufeature.h | 7 +++++++ arch/arm64/kernel/cpufeature.c | 13 +++++++++---- arch/arm64/kernel/cpuinfo.c | 3 ++- 3 files changed, 18 insertions(+), 5 deletions(-) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 876e0ae300fd..4050293403c9 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -615,6 +615,13 @@ static inline bool id_aa64pfr0_mpam(u64 pfr0) return val > 0; } +static inline bool id_aa64pfr1_mpamfrac(u64 pfr1) +{ + u32 val = cpuid_feature_extract_unsigned_field(pfr1, ID_AA64PFR1_EL1_MPAM_frac_SHIFT); + + return val > 0; +} + static inline bool id_aa64pfr1_mte(u64 pfr1) { u32 val = cpuid_feature_extract_unsigned_field(pfr1, ID_AA64PFR1_EL1_MTE_SHIFT); diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index d76225b4a00f..811f32cf42d6 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1082,7 +1082,8 @@ void __init init_cpu_features(struct cpuinfo_arm64 *info) cpacr_restore(cpacr); } - if (id_aa64pfr0_mpam(info->reg_id_aa64pfr0)) + if (id_aa64pfr0_mpam(info->reg_id_aa64pfr0) || + id_aa64pfr1_mpamfrac(info->reg_id_aa64pfr1)) init_cpu_ftr_reg(SYS_MPAMIDR_EL1, info->reg_mpamidr); if (id_aa64pfr1_mte(info->reg_id_aa64pfr1)) @@ -1352,7 +1353,8 @@ void update_cpu_features(int cpu, cpacr_restore(cpacr); } - if (id_aa64pfr0_mpam(info->reg_id_aa64pfr0)) { + if (id_aa64pfr0_mpam(info->reg_id_aa64pfr0) || + id_aa64pfr1_mpamfrac(info->reg_id_aa64pfr1)) { taint |= check_update_ftr_reg(SYS_MPAMIDR_EL1, cpu, info->reg_mpamidr, boot->reg_mpamidr); } @@ -2340,7 +2342,11 @@ cpucap_panic_on_conflict(const struct arm64_cpu_capabilities *cap) static bool __maybe_unused test_has_mpam(const struct arm64_cpu_capabilities *entry, int scope) { - if (!has_cpuid_feature(entry, scope)) + u64 pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); + u64 pfr1 = read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1); + + if (!id_aa64pfr0_mpam(pfr0) && + !id_aa64pfr1_mpamfrac(pfr1)) return false; /* Check firmware actually enabled MPAM on this cpu. */ @@ -2863,7 +2869,6 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .capability = ARM64_MPAM, .matches = test_has_mpam, .cpu_enable = cpu_enable_mpam, - ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, MPAM, 1) }, #endif {}, diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index 1b1fe0f58a86..59dcbcfe1ba0 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -461,7 +461,8 @@ static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) __cpuinfo_store_cpu_32bit(&info->aarch32); if (IS_ENABLED(CONFIG_ARM64_MPAM) && - id_aa64pfr0_mpam(info->reg_id_aa64pfr0)) + (id_aa64pfr0_mpam(info->reg_id_aa64pfr0) || + id_aa64pfr1_mpamfrac(info->reg_id_aa64pfr1))) info->reg_mpamidr = read_cpuid(MPAMIDR_EL1); cpuinfo_detect_icache_policy(info); -- 2.25.1