linux-kernel - [PATCH v2 17/17] arm64: Advertise TRBE erratum workaround for write to out-of-range address

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Date:   Tue, 21 Sep 2021 14:41:21 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, maz@...nel.org,
        catalin.marinas@....com, mark.rutland@....com, james.morse@....com,
        anshuman.khandual@....com, leo.yan@...aro.org,
        mike.leach@...aro.org, mathieu.poirier@...aro.org, will@...nel.org,
        lcherian@...vell.com, coresight@...ts.linaro.org,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v2 17/17] arm64: Advertise TRBE erratum workaround for write to out-of-range address

Add Kconfig entries for the errata workarounds for TRBE writing
to an out-of-range address.

Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Anshuman Khandual <anshuman.khandual@....com>
Cc: Mike Leach <mike.leach@...aro.org>
Cc: Leo Yan <leo.yan@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 Documentation/arm64/silicon-errata.rst |  4 +++
 arch/arm64/Kconfig                     | 39 ++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index 569a92411dcd..5342e895fb60 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -96,6 +96,8 @@ stable kernels.
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | Cortex-A710     | #2054223        | ARM64_ERRATUM_2054223       |
 +----------------+-----------------+-----------------+-----------------------------+
+| ARM            | Cortex-A710     | #2224489        | ARM64_ERRATUM_2224489       |
++----------------+-----------------+-----------------+-----------------------------+
 | ARM            | Neoverse-N1     | #1188873,1418040| ARM64_ERRATUM_1418040       |
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | Neoverse-N1     | #1349291        | N/A                         |
@@ -106,6 +108,8 @@ stable kernels.
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | Neoverse-N2     | #2067961        | ARM64_ERRATUM_2067961       |
 +----------------+-----------------+-----------------+-----------------------------+
+| ARM            | Neoverse-N2     | #2253138        | ARM64_ERRATUM_2253138       |
++----------------+-----------------+-----------------+-----------------------------+
 | ARM            | MMU-500         | #841119,826419  | N/A                         |
 +----------------+-----------------+-----------------+-----------------------------+
 +----------------+-----------------+-----------------+-----------------------------+
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 0764774e12bb..611ae02aabbd 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -736,6 +736,45 @@ config ARM64_ERRATUM_2067961
 
 	  If unsure, say Y.
 
+config ARM64_WORKAROUND_TRBE_WRITE_OUT_OF_RANGE
+	bool
+
+config ARM64_ERRATUM_2253138
+	bool "Neoverse-N2: 2253138: workaround TRBE writing to address out-of-range"
+	depends on CORESIGHT_TRBE
+	default y
+	select ARM64_WORKAROUND_TRBE_WRITE_OUT_OF_RANGE
+	help
+	  This option adds the workaround for ARM Neoverse-N2 erratum 2253138.
+
+	  Affected Neoverse-N2 cores might write to an out-of-range address, not reserved
+	  for TRBE. Under some conditions, the TRBE might generate a write to the next
+	  virtually addressed page following the last page of the TRBE address space
+	  (i.e, the TRBLIMITR_EL1.LIMIT), instead of wrapping around to the base.
+
+	  We work around this in the driver by, always making sure that there is a
+	  page beyond the TRBLIMITR_EL1.LIMIT, within the space allowed for the TRBE.
+
+	  If unsure, say Y.
+
+config ARM64_ERRATUM_2224489
+	bool "Cortex-A710: 2224489: workaround TRBE writing to address out-of-range"
+	depends on CORESIGHT_TRBE
+	default y
+	select ARM64_WORKAROUND_TRBE_WRITE_OUT_OF_RANGE
+	help
+	  This option adds the workaround for ARM Cortex-A710 erratum 2224489.
+
+	  Affected Cortex-A710 cores might write to an out-of-range address, not reserved
+	  for TRBE. Under some conditions, the TRBE might generate a write to the next
+	  virtually addressed page following the last page of the TRBE address space
+	  (i.e, the TRBLIMITR_EL1.LIMIT), instead of wrapping around to the base.
+
+	  We work around this in the driver by, always making sure that there is a
+	  page beyond the TRBLIMITR_EL1.LIMIT, within the space allowed for the TRBE.
+
+	  If unsure, say Y.
+
 config CAVIUM_ERRATUM_22375
 	bool "Cavium erratum 22375, 24313"
 	default y
-- 
2.24.1