diff options
Diffstat (limited to 'arch/arm64/kernel/cpu_errata.c')
| -rw-r--r-- | arch/arm64/kernel/cpu_errata.c | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 9332cf7c082..e107ed2d66d 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -23,6 +23,8 @@ #include <asm/cputype.h> #include <asm/cpufeature.h> +#define MIDR_CORTEX_A53 MIDR_CPU_PART(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A53) + /* * Add a struct or another datatype to the union below if you need * different means to detect an affected CPU. @@ -39,8 +41,37 @@ struct arm64_cpu_capabilities { }; }; +#define CPU_MODEL_MASK (MIDR_IMPLEMENTOR_MASK | MIDR_PARTNUM_MASK | \ + MIDR_ARCHITECTURE_MASK) + +static bool __maybe_unused +is_affected_midr_range(struct arm64_cpu_capabilities *entry) +{ + u32 midr = read_cpuid_id(); + + if ((midr & CPU_MODEL_MASK) != entry->midr_model) + return false; + + midr &= MIDR_REVISION_MASK | MIDR_VARIANT_MASK; + + return (midr >= entry->midr_range_min && midr <= entry->midr_range_max); +} + +#define MIDR_RANGE(model, min, max) \ + .is_affected = is_affected_midr_range, \ + .midr_model = model, \ + .midr_range_min = min, \ + .midr_range_max = max + struct arm64_cpu_capabilities arm64_errata[] = { - {} + { + /* Cortex-A53 r0p[012] */ + .desc = "ARM errata 826319, 827319, 824069", + .capability = ARM64_WORKAROUND_CLEAN_CACHE, + MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x02), + }, + { + } }; void check_local_cpu_errata(void) |