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Diffstat (limited to 'arch/arm64/kernel/cpu_errata.c')
-rw-r--r--arch/arm64/kernel/cpu_errata.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index 06afd04e02c0..d42789499f17 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -22,14 +22,16 @@
#include <asm/cpufeature.h>
static bool __maybe_unused
-is_affected_midr_range(const struct arm64_cpu_capabilities *entry)
+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);
}
#define MIDR_RANGE(model, min, max) \
+ .def_scope = SCOPE_LOCAL_CPU, \
.matches = is_affected_midr_range, \
.midr_model = model, \
.midr_range_min = min, \
@@ -101,6 +103,26 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
}
};
+/*
+ * The CPU Errata work arounds are detected and applied at boot time
+ * and the related information is freed soon after. If the new CPU requires
+ * an errata not detected at boot, fail this CPU.
+ */
+void verify_local_cpu_errata(void)
+{
+ const struct arm64_cpu_capabilities *caps = arm64_errata;
+
+ for (; caps->matches; caps++)
+ if (!cpus_have_cap(caps->capability) &&
+ caps->matches(caps, SCOPE_LOCAL_CPU)) {
+ pr_crit("CPU%d: Requires work around for %s, not detected"
+ " at boot time\n",
+ smp_processor_id(),
+ caps->desc ? : "an erratum");
+ cpu_die_early();
+ }
+}
+
void check_local_cpu_errata(void)
{
update_cpu_capabilities(arm64_errata, "enabling workaround for");