linux-kernel - [PATCH 19/52] arm64: cpu_errata: Allow an erratum to be match for all revisions of a core

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Date:   Mon, 26 Feb 2018 16:19:53 +0800
From:   Alex Shi <alex.shi@...aro.org>
To:     Marc Zyngier <marc.zyngier@....com>,
        Will Deacon <will.deacon@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        stable@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM64 PORT
        (AARCH64 ARCHITECTURE)), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 19/52] arm64: cpu_errata: Allow an erratum to be match for all revisions of a core

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

commit 06f1494f837 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@...utronix.de>
Acked-by: Mark Rutland <mark.rutland@....com>
Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Alex Shi <alex.shi@...aro.org>
---
 arch/arm64/kernel/cpu_errata.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index b75e917..c66a673c 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -53,6 +53,13 @@ static int cpu_enable_trap_ctr_access(void *__unused)
 	.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) || \
-- 
2.7.4