linux-kernel - [PATCH v2] arm64: cpufeature: Enable Qualcomm Falkor/Kryo errata 1003

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Date:   Tue, 29 Oct 2019 10:15:39 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, stable@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH v2] arm64: cpufeature: Enable Qualcomm Falkor/Kryo errata 1003

With the introduction of 'cce360b54ce6 ("arm64: capabilities: Filter the
entries based on a given mask")' the Qualcomm Falkor/Kryo errata 1003 is
no long applied.

The result of not applying errata 1003 is that MSM8996 runs into various
RCU stalls and fails to boot most of the times.

Give 1003 a "type" to ensure they are not filtered out in
update_cpu_capabilities().

Fixes: cce360b54ce6 ("arm64: capabilities: Filter the entries based on a given mask")
Cc: stable@...r.kernel.org
Reported-by: Mark Brown <broonie@...nel.org>
Suggested-by: Will Deacon <will@...nel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---

Changes since v1:
- s/ARM64_CPUCAP_SCOPE_LOCAL_CPU/ARM64_CPUCAP_LOCAL_CPU_ERRATUM/
- Dropped 1009 "fix" as it already had a type from ERRATA_MIDR_RANGE_LIST()

 arch/arm64/kernel/cpu_errata.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index df9465120e2f..3facd5ca52ed 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -780,6 +780,7 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
 	{
 		.desc = "Qualcomm Technologies Falkor/Kryo erratum 1003",
 		.capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003,
+		.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
 		.matches = cpucap_multi_entry_cap_matches,
 		.match_list = qcom_erratum_1003_list,
 	},
-- 
2.23.0