CONFIG_ARM_SDEI_NMI: SDEI-based cross-CPU NMI service (arm64)

General informations

The Linux kernel configuration item CONFIG_ARM_SDEI_NMI:

• prompt: SDEI-based cross-CPU NMI service (arm64)
• type: bool
• depends on: CONFIG_ARM_SDE_INTERFACE
• defined in drivers/firmware/Kconfig
• found in Linux kernels: 7.3-rc+HEAD

Help text

Provides SDEI-based cross-CPU NMI delivery for hooks that need to reach interrupt-masked CPUs on silicon that lacks FEAT_NMI:

- arch_trigger_cpumask_backtrace() (sysrq-l, RCU stalls, hardlockup_all_cpu_backtrace, soft-lockup secondary dumps, hung-task auxiliary dumps) - smp_send_stop() escalation (reboot/halt and the panic / kdump crash stop)

The driver registers a handler for the SDEI software-signalled event (event 0) and reaches a target CPU by signalling it with SDEI_EVENT_SIGNAL. Firmware delivers the event out of EL3 regardless of the target's PSTATE.DAIF -- forced delivery into a CPU wedged with interrupts locally masked.

If unsure, say N.

Hardware

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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