CONFIG_ARM64_ERRATUM_2253138: Neoverse-N2: 2253138: workaround TRBE writing to address out-of-range

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_2253138:

• prompt: Neoverse-N2: 2253138: workaround TRBE writing to address out-of-range
• type: bool
• depends on: CONFIG_CORESIGHT_TRBE
• defined in arch/arm64/Kconfig
• found in Linux kernels: 5.16–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

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.

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.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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