CONFIG_IOMMU_DEBUG: Enable IOMMU debugging

General informations

The Linux kernel configuration item CONFIG_IOMMU_DEBUG has multiple definitions:

Enable IOMMU debugging found in arch/x86/Kconfig.debug

The configuration item CONFIG_IOMMU_DEBUG:

• prompt: Enable IOMMU debugging
• type: bool
• depends on: ( CONFIG_GART_IOMMU && CONFIG_DEBUG_KERNEL ) && ( CONFIG_X86_64 )
• defined in arch/x86/Kconfig.debug
• found in Linux kernels: 2.6.24–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Force the IOMMU to on even when you have less than 4GB of memory and add debugging code. On overflow always panic. And allow to enable IOMMU leak tracing. Can be disabled at boot time with iommu=noforce. This will also enable scatter gather list merging. Currently not recommended for production code. When you use it make sure you have a big enough IOMMU/AGP aperture. Most of the options enabled by this can be set more finegrained using the iommu= command line options. See Documentation/arch/x86/x86_64/boot-options.rst for more details.

Enable IOMMU debugging found in arch/x86_64/Kconfig.debug

The configuration item CONFIG_IOMMU_DEBUG:

• prompt: Enable IOMMU debugging
• type: bool
• depends on: CONFIG_IOMMU && CONFIG_DEBUG_KERNEL
• defined in arch/x86_64/Kconfig.debug
• found in Linux kernels: 2.6.9–2.6.23

Help text

Force the IOMMU to on even when you have less than 4GB of memory and add debugging code. On overflow always panic. And allow to enable IOMMU leak tracing. Can be disabled at boot time with iommu=noforce. This will also enable scatter gather list merging. Currently not recommended for production code. When you use it make sure you have a big enough IOMMU/AGP aperture. Most of the options enabled by this can be set more finegrained using the iommu= command line options. See Documentation/x86_64/boot-options.txt for more details.

Enable IOMMU debugging found in arch/x86_64/Kconfig

The configuration item CONFIG_IOMMU_DEBUG:

• prompt: Enable IOMMU debugging
• type: bool
• depends on: CONFIG_GART_IOMMU && CONFIG_DEBUG_KERNEL
• defined in arch/x86_64/Kconfig
• found in Linux kernels: 2.6.6–2.6.8

Help text

Force the IOMMU to on even when you have less than 4GB of memory and add debugging code. On overflow always panic. And allow to enable IOMMU leak tracing. Can be disabled at boot time with iommu=noforce. This will also enable scatter gather list merging. Currently not recommended for production code. When you use it make sure you have a big enough IOMMU/AGP aperture. Most of the options enabled by this can be set more finegrained using the iommu= command line options. See Documentation/x86_64/boot-options.txt for more details.

Force IOMMU to on found in arch/x86_64/Kconfig

The configuration item CONFIG_IOMMU_DEBUG:

• prompt: Force IOMMU to on
• type: bool
• depends on: CONFIG_GART_IOMMU && CONFIG_DEBUG_KERNEL
• defined in arch/x86_64/Kconfig
• found in Linux kernels: 2.5.67–2.5.75, 2.6.0–2.6.5

Help text

Force the IOMMU to on even when you have less than 4GB of memory and add debugging code. Can be disabled at boot time with iommu=noforce.

Hardware

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The data is retrived from:

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