linux-kernel - [PATCH] arm64: Enable repeat tlbi workaround on KRYO4XX gold CPUs

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Message-Id: <20220511080247.1530-1-quic_shrekk@quicinc.com>
Date:   Wed, 11 May 2022 13:32:47 +0530
From:   Shreyas K K <quic_shrekk@...cinc.com>
To:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mark Rutland <mark.rutland@....com>
Cc:     Andre Przywara <andre.przywara@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org,
        Jeffrey Hugo <quic_jhugo@...cinc.com>,
        Shreyas K K <quic_shrekk@...cinc.com>,
        Sai Prakash Ranjan <quic_saipraka@...cinc.com>,
        Rajendra Nayak <quic_rjendra@...cinc.com>,
        Prasanna Kumar <quic_kprasan@...cinc.com>
Subject: [PATCH] arm64: Enable repeat tlbi workaround on KRYO4XX gold CPUs

Add KRYO4XX gold/big cores to the list of CPUs that need the
repeat TLBI workaround. Apply this to the affected
KRYO4XX cores (rcpe to rdpe).

The variant and revision bits are implementation defined and are
different from the their Cortex CPU counterparts on which they are
based on, i.e., (r0p0 to r1p0) is equivalent to (rcpe to rdpe).

Signed-off-by: Shreyas K K <quic_shrekk@...cinc.com>
---
 Documentation/arm64/silicon-errata.rst | 3 +++
 arch/arm64/kernel/cpu_errata.c         | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index 466cb9e89047..d27db84d585e 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -189,6 +189,9 @@ stable kernels.
 +----------------+-----------------+-----------------+-----------------------------+
 | Qualcomm Tech. | Kryo4xx Silver  | N/A             | ARM64_ERRATUM_1024718       |
 +----------------+-----------------+-----------------+-----------------------------+
+| Qualcomm Tech. | Kryo4xx Gold    | N/A             | ARM64_ERRATUM_1286807       |
++----------------+-----------------+-----------------+-----------------------------+
+
 +----------------+-----------------+-----------------+-----------------------------+
 | Fujitsu        | A64FX           | E#010001        | FUJITSU_ERRATUM_010001      |
 +----------------+-----------------+-----------------+-----------------------------+
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index 4c9b5b4b7a0b..2518657e6de1 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -208,6 +208,8 @@ static const struct arm64_cpu_capabilities arm64_repeat_tlbi_list[] = {
 #ifdef CONFIG_ARM64_ERRATUM_1286807
 	{
 		ERRATA_MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 3, 0),
+		/* Kryo4xx Gold (rcpe to rdpe) => (r0p0 to r1p0) */
+		ERRATA_MIDR_RANGE(QCOM_CPU_PART_KRYO_4XX_GOLD, 0xc, 0xe, 0xd, 0xe),
 	},
 #endif
 	{},
-- 
2.17.1