CONFIG_INDIRECT_PIO: Access I/O in non-MMIO mode

General informations

The Linux kernel configuration item CONFIG_INDIRECT_PIO:

• prompt: Access I/O in non-MMIO mode
• type: bool
• depends on: ( CONFIG_ARM64 ) && ( CONFIG_HAS_IOPORT )
• defined in lib/Kconfig
• found in Linux kernels: 4.17–4.20, 5.0–5.19, 6.0–6.10

Help text

On some platforms where no separate I/O space exists, there are I/O hosts which can not be accessed in MMIO mode. Using the logical PIO mechanism, the host-local I/O resource can be mapped into system logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the system can access the I/O devices with the mapped-logic PIO through I/O accessors.

This way has relatively little I/O performance cost. Please make sure your devices really need this configure item enabled.

When in doubt, say N.

Hardware

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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