CONFIG_CALGARY_IOMMU: IBM Calgary IOMMU support

General informations

The Linux kernel configuration item CONFIG_CALGARY_IOMMU has multiple definitions:

IBM Calgary IOMMU support found in arch/x86/Kconfig

The configuration item CONFIG_CALGARY_IOMMU:

• prompt: IBM Calgary IOMMU support
• type: bool
• depends on: CONFIG_X86_64 && CONFIG_PCI
• defined in arch/x86/Kconfig
• found in Linux kernels: 2.6.24–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.4

Help text

Support for hardware IOMMUs in IBM's xSeries x366 and x460 systems. Needed to run systems with more than 3GB of memory properly with 32-bit PCI devices that do not support DAC (Double Address Cycle). Calgary also supports bus level isolation, where all DMAs pass through the IOMMU. This prevents them from going anywhere except their intended destination. This catches hard-to-find kernel bugs and mis-behaving drivers and devices that do not use the DMA-API properly to set up their DMA buffers. The IOMMU can be turned off at boot time with the iommu=off parameter. Normally the kernel will make the right choice by itself. If unsure, say Y.

IBM Calgary IOMMU support found in arch/x86_64/Kconfig

The configuration item CONFIG_CALGARY_IOMMU:

• prompt: IBM Calgary IOMMU support
• type: bool
• depends on: CONFIG_PCI && CONFIG_EXPERIMENTAL
• defined in arch/x86_64/Kconfig
• found in Linux kernels: 2.6.18–2.6.23

Help text

Support for hardware IOMMUs in IBM's xSeries x366 and x460 systems. Needed to run systems with more than 3GB of memory properly with 32-bit PCI devices that do not support DAC (Double Address Cycle). Calgary also supports bus level isolation, where all DMAs pass through the IOMMU. This prevents them from going anywhere except their intended destination. This catches hard-to-find kernel bugs and mis-behaving drivers and devices that do not use the DMA-API properly to set up their DMA buffers. The IOMMU can be turned off at boot time with the iommu=off parameter. Normally the kernel will make the right choice by itself. If unsure, say Y.

Hardware

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