arm64: errata: Add workaround for Cortex-A76 erratum #1463225

[uclinux-h8/linux.git] / arch / arm64 / kernel / cpu_errata.c

diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index e88d4e7..ac6432b 100644 (file)
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -502,6 +502,22 @@ static const struct midr_range arm64_ssb_cpus[] = {
        {},
 };
 
+#ifdef CONFIG_ARM64_ERRATUM_1463225
+DEFINE_PER_CPU(int, __in_cortex_a76_erratum_1463225_wa);
+
+static bool
+has_cortex_a76_erratum_1463225(const struct arm64_cpu_capabilities *entry,
+                              int scope)
+{
+       u32 midr = read_cpuid_id();
+       /* Cortex-A76 r0p0 - r3p1 */
+       struct midr_range range = MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 3, 1);
+
+       WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
+       return is_midr_in_range(midr, &range) && is_kernel_in_hyp_mode();
+}
+#endif
+
 static void __maybe_unused
 cpu_enable_cache_maint_trap(const struct arm64_cpu_capabilities *__unused)
 {
@@ -824,6 +840,14 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
                ERRATA_MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 2, 0),
        },
 #endif
+#ifdef CONFIG_ARM64_ERRATUM_1463225
+       {
+               .desc = "ARM erratum 1463225",
+               .capability = ARM64_WORKAROUND_1463225,
+               .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
+               .matches = has_cortex_a76_erratum_1463225,
+       },
+#endif
        {
        }
 };