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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 --- Documentation/arm64/silicon-errata.txt | 1 + arch/arm64/Kconfig | 14 ++++++++++++++ arch/arm64/kernel/cpu_errata.c | 8 ++++++++ 3 files changed, 23 insertions(+) -- 2.7.0.rc3 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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 */