linux-kernel - [PATCH V3] arm64: Enable repeat tlbi workaround on KRYO4XX gold CPUs

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Date:   Thu, 12 May 2022 16:31:34 +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 V3] 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 rfpe).

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 r3p0) is equivalent to (rcpe to rfpe).

Signed-off-by: Shreyas K K <quic_shrekk@...cinc.com>
---

Changes in v2:
 * r2p0 and r3p0 are also affected by this erratum.
 * Add the corresponding cores (repe and rfpe) making the range rcpe to rfpe.

Changes in v3:
 * Fix the CPU model macro.

 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..a0f3d0aaa3c5 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 rfpe) => (r0p0 to r3p0) */
+		ERRATA_MIDR_RANGE(MIDR_QCOM_KRYO_4XX_GOLD, 0xc, 0xe, 0xf, 0xe),
 	},
 #endif
 	{},
-- 
2.17.1