CONFIG_ARM_ERRATA_720789: ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID

General informations

The Linux kernel configuration item CONFIG_ARM_ERRATA_720789:

• prompt: ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID
• type: bool
• depends on: CONFIG_CPU_V7
• defined in arch/arm/Kconfig
• found in Linux kernels: 2.6.36–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD

Help text

This option enables the workaround for the 720789 Cortex-A9 (prior to r2p0) erratum. A faulty ASID can be sent to the other CPUs for the broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. As a consequence of this erratum, some TLB entries which should be invalidated are not, resulting in an incoherency in the system page tables. The workaround changes the TLB flushing routines to invalidate entries regardless of the ASID.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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