The patch below is on top of Matthias' patch series:
arm64: Implement IPI based TLB invalidation
The series is used to enable a workaround for Cavium ThunderX pass 1.x
systems.
-Robert
>From abb99ee83473d9ecffb4fdaae9c69435ca670bc8 Mon Sep 17 00:00:00 2001
From: Robert Richter <rrichter@xxxxxxxxxx>
Date: Fri, 29 Jul 2016 09:40:04 +0200
Subject: [PATCH] arm64: Add workaround for Cavium erratum 26026
STX may return a wrong status value if the store was successful.
This may happen on ThunderX T88 pass 1.x cpus if a broadcast TLBI is
executed on another cpu in parallel to an STX. As a result atomic or
non-blocking implementations can behave incorrectly. Use IPIs that
call local TLBIs on other cpus to avoid this.
Applies to ThunderX T88 pass 1.x cpus.
Signed-off-by: Robert Richter <rrichter@xxxxxxxxxx>
---
Documentation/arm64/silicon-errata.txt | 1 +
arch/arm64/Kconfig | 14 ++++++++++++++
arch/arm64/kernel/cpu_errata.c | 8 ++++++++
3 files changed, 23 insertions(+)
diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt
index 4da60b463995..0d870d934528 100644
--- a/Documentation/arm64/silicon-errata.txt
+++ b/Documentation/arm64/silicon-errata.txt
@@ -58,5 +58,6 @@ stable kernels.
| Cavium | ThunderX ITS | #22375, #24313 | CAVIUM_ERRATUM_22375 |
| Cavium | ThunderX ITS | #23144 | CAVIUM_ERRATUM_23144 |
| Cavium | ThunderX GICv3 | #23154 | CAVIUM_ERRATUM_23154 |
+| Cavium | ThunderX Core | #26026 | CAVIUM_ERRATUM_26026 |
| Cavium | ThunderX Core | #27456 | CAVIUM_ERRATUM_27456 |
| Cavium | ThunderX SMMUv2 | #27704 | N/A |
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 5a0a691d4220..8cbd9043ec6f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -457,6 +457,20 @@ config CAVIUM_ERRATUM_23154
If unsure, say Y.
+config CAVIUM_ERRATUM_26026
+ bool "Cavium erratum 26026: STX may return wrong status value"
+ default y
+ help
+ STX may return a wrong status value if the store was
+ successful. This may happen on ThunderX T88 pass 1.x cpus if
+ a broadcast TLBI is executed on another cpu in parallel to
+ an STX. As a result atomic or non-blocking implementations
+ can behave incorrectly. Use IPIs that call local TLBIs on
+ other cpus to avoid this.
+ Applies to ThunderX T88 pass 1.x cpus.
+
+ If unsure, say Y.
+
config CAVIUM_ERRATUM_27456
bool "Cavium erratum 27456: Broadcast TLBI instructions may cause icache corruption"
default y
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index af716b65110d..1e1753a6408e 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -90,6 +90,14 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
MIDR_RANGE(MIDR_THUNDERX, 0x00, 0x01),
},
#endif
+#ifdef CONFIG_CAVIUM_ERRATUM_26026
+ {
+ /* Cavium ThunderX, pass 1.x */
+ .desc = "Cavium erratum 26026",
+ .capability = ARM64_HAS_NO_BCAST_TLBI,
+ MIDR_RANGE(MIDR_THUNDERX, 0x00, 0x01),
+ },
+#endif
#ifdef CONFIG_CAVIUM_ERRATUM_27456
{
/* Cavium ThunderX, T88 pass 1.x - 2.1 */
--
2.7.0.rc3
--
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