CONFIG_IOMMU_DEBUG is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT
Enable IOMMU debugging
configname: CONFIG_IOMMU_DEBUG
Linux Kernel Configuration
└─>Kernel hacking
└─>$(SRCARCH) Debugging
└─>Enable IOMMU debugging
In linux kernel since version 2.6.12
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/x86_64/boot-options.rst for more
details.
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/x86_64/boot-options.rst for more
details.