Messages in this thread Patch in this message | | | From | Suzuki K Poulose <> | Subject | [PATCH 12/16] arm64: Add helpers for checking CPU MIDR against a range | Date | Tue, 23 Jan 2018 12:28:05 +0000 |
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Add helpers for checking if the given CPU midr falls in a range of variants/revisions for a given model.
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- arch/arm64/include/asm/cpufeature.h | 7 ++----- arch/arm64/include/asm/cputype.h | 38 +++++++++++++++++++++++++++++++++++++ arch/arm64/kernel/cpu_errata.c | 16 +++++----------- 3 files changed, 45 insertions(+), 16 deletions(-)
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 4c3d6987acfc..a3d54c2c411f 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -10,6 +10,7 @@ #define __ASM_CPUFEATURE_H #include <asm/cpucaps.h> +#include <asm/cputype.h> #include <asm/fpsimd.h> #include <asm/hwcap.h> #include <asm/sigcontext.h> @@ -134,11 +135,7 @@ struct arm64_cpu_capabilities { /* Called on all active CPUs for all "available" capabilities */ int (*enable)(const struct arm64_cpu_capabilities *caps); union { - struct { /* To be used for erratum handling only */ - u32 midr_model; - u32 midr_range_min, midr_range_max; - }; - + struct midr_range midr_range; /* To be used for erratum handling only */ struct { /* Feature register checking */ u32 sys_reg; u8 field_pos; diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h index 2f8d39ed9c2e..26bc5b302060 100644 --- a/arch/arm64/include/asm/cputype.h +++ b/arch/arm64/include/asm/cputype.h @@ -116,6 +116,44 @@ #define read_cpuid(reg) read_sysreg_s(SYS_ ## reg) /* + * Represent a range of MIDR values for a given CPU model and a + * range of variant/revision values. + * + * @model - CPU model as defined by MIDR_CPU_MODEL + * @rv_min - Minimum value for the revision/variant as defined by + * MIDR_CPU_VAR_REV + * @rv_max - Maximum value for the variant/revision for the range. + */ +struct midr_range { + u32 model; + u32 rv_min; + u32 rv_max; +}; + +#define MIDR_RANGE(m, v_min, r_min, v_max, r_max) \ + { \ + .model = m, \ + .rv_min = MIDR_CPU_VAR_REV(v_min, r_min), \ + .rv_max = MIDR_CPU_VAR_REV(v_max, r_max), \ + } + +#define MIDR_ALL_VERSIONS(m) MIDR_RANGE(m, 0, 0, 0xf, 0xf) + +static inline bool is_midr_in_range(u32 midr, struct midr_range const *range) +{ + return MIDR_IS_CPU_MODEL_RANGE(midr, range->model, + range->rv_min, range->rv_max); +} + +static inline bool is_midr_in_range_list(u32 midr, struct midr_range const *ranges) +{ + while (ranges->model) + if (is_midr_in_range(midr, ranges++)) + return true; + return false; +} + +/* * The CPU ID never changes at run time, so we might as well tell the * compiler that it's constant. Use this function to read the CPU ID * rather than directly reading processor_id or read_cpuid() directly. diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 054b17009f41..10eb7fa0d0d7 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -25,9 +25,7 @@ static bool __maybe_unused is_affected_midr_range(const struct arm64_cpu_capabilities *entry, int scope) { WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); - return MIDR_IS_CPU_MODEL_RANGE(read_cpuid_id(), entry->midr_model, - entry->midr_range_min, - entry->midr_range_max); + return is_midr_in_range(read_cpuid_id(), &entry->midr_range); } static bool __maybe_unused @@ -41,7 +39,7 @@ is_kryo_midr(const struct arm64_cpu_capabilities *entry, int scope) model &= MIDR_IMPLEMENTOR_MASK | (0xf00 << MIDR_PARTNUM_SHIFT) | MIDR_ARCHITECTURE_MASK; - return model == entry->midr_model; + return model == entry->midr_range.model; } static bool @@ -182,9 +180,7 @@ static int qcom_enable_link_stack_sanitization( #define ERRATA_MIDR_RANGE(model, v_min, r_min, v_max, r_max) \ .type = ARM64_CPUCAP_STRICT_CPU_LOCAL_ERRATUM, \ .matches = is_affected_midr_range, \ - .midr_model = model, \ - .midr_range_min = MIDR_CPU_VAR_REV(v_min, r_min), \ - .midr_range_max = MIDR_CPU_VAR_REV(v_max, r_max) + .midr_range = MIDR_RANGE(model, v_min, r_min, v_max, r_max) /* Errata affecting a range of revisions of given model variant */ #define ERRATA_MIDR_REV_RANGE(m, var, r_min, r_max) \ @@ -198,9 +194,7 @@ static int qcom_enable_link_stack_sanitization( #define ERRATA_MIDR_ALL_VERSIONS(model) \ .type = ARM64_CPUCAP_STRICT_CPU_LOCAL_ERRATUM, \ .matches = is_affected_midr_range, \ - .midr_model = model, \ - .midr_range_min = 0, \ - .midr_range_max = (MIDR_VARIANT_MASK | MIDR_REVISION_MASK) + .midr_range = MIDR_ALL_VERSIONS(model) const struct arm64_cpu_capabilities arm64_errata[] = { #if defined(CONFIG_ARM64_ERRATUM_826319) || \ @@ -314,7 +308,7 @@ const struct arm64_cpu_capabilities arm64_errata[] = { .desc = "Qualcomm Technologies Kryo erratum 1003", .capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003, .type = ARM64_CPUCAP_STRICT_CPU_LOCAL_ERRATUM, - .midr_model = MIDR_QCOM_KRYO, + .midr_range.model = MIDR_QCOM_KRYO, .matches = is_kryo_midr, }, #endif -- 2.13.6
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