arm64: cpu_errata: Allow an erratum to be match for all revisions of a core

From: Marc Zyngier <marc.zyngier@arm.com>

commit 06f1494f837da8997d670a1ba87add7963b08922 upstream.

Some minor erratum may not be fixed in further revisions of a core,
leading to a situation where the workaround needs to be updated each
time an updated core is released.

Introduce a MIDR_ALL_VERSIONS match helper that will work for all
versions of that MIDR, once and for all.

Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com> [v4.9 backport]
Tested-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index 3884c43..b9fcbd1 100644 (file)
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -127,6 +127,13 @@ static void  install_bp_hardening_cb(const struct arm64_cpu_capabilities *entry,
        .midr_range_min = min, \
        .midr_range_max = max
 
+#define MIDR_ALL_VERSIONS(model) \
+       .def_scope = SCOPE_LOCAL_CPU, \
+       .matches = is_affected_midr_range, \
+       .midr_model = model, \
+       .midr_range_min = 0, \
+       .midr_range_max = (MIDR_VARIANT_MASK | MIDR_REVISION_MASK)
+
 const struct arm64_cpu_capabilities arm64_errata[] = {
 #if    defined(CONFIG_ARM64_ERRATUM_826319) || \
        defined(CONFIG_ARM64_ERRATUM_827319) || \