drivers/iommu/amd/Kconfig

Source file repositories/reference/linux-study-clean/drivers/iommu/amd/Kconfig

File Facts

System: Linux kernel
Corpus path: drivers/iommu/amd/Kconfig
Extension: [no extension]
Size: 1685 bytes
Lines: 54
Domain: Driver Families
Bucket: drivers/iommu
Inferred role: Driver Families: build/configuration rule
Status: atlas-only

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
Touches IRQ or DMA behavior; this matters for the representative real-device path.

Dependency Surface

No C-style include directives detected by the generator.

Detected Declarations

No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

# SPDX-License-Identifier: GPL-2.0-only
# AMD IOMMU support
config AMD_IOMMU
	bool "AMD IOMMU support"
	select SWIOTLB
	select PCI_MSI
	select PCI_ATS
	select PCI_PRI
	select PCI_PASID
	select IRQ_MSI_LIB
	select MMU_NOTIFIER
	select IOMMU_API
	select IOMMU_IOVA
	select IOMMU_SVA
	select IOMMU_IOPF
	select IOMMUFD_DRIVER if IOMMUFD
	select GENERIC_PT
	select IOMMU_PT
	select IOMMU_PT_AMDV1
	select IOMMU_PT_X86_64
	depends on X86_64 && PCI && ACPI && HAVE_CMPXCHG_DOUBLE
	help
	  With this option you can enable support for AMD IOMMU hardware in
	  your system. An IOMMU is a hardware component which provides
	  remapping of DMA memory accesses from devices. With an AMD IOMMU you
	  can isolate the DMA memory of different devices and protect the
	  system from misbehaving device drivers or hardware.

	  You can find out if your system has an AMD IOMMU if you look into
	  your BIOS for an option to enable it or if you have an IVRS ACPI
	  table.

config AMD_IOMMU_IOMMUFD
	bool "Enable IOMMUFD features for AMD IOMMU (EXPERIMENTAL)"
	depends on IOMMUFD
	depends on AMD_IOMMU
	help
	  Support for IOMMUFD features intended to support virtual machines
	  with accelerated virtual IOMMUs.

	  Say Y here if you are doing development and testing on this feature.

config AMD_IOMMU_DEBUGFS
	bool "Enable AMD IOMMU internals in DebugFS"
	depends on AMD_IOMMU && IOMMU_DEBUGFS
	help
	  !!!WARNING!!!  !!!WARNING!!!  !!!WARNING!!!  !!!WARNING!!!

	  DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!!
	  Exposes AMD IOMMU device internals in DebugFS.

	  This option is -NOT- intended for production environments, and should
	  not generally be enabled.

Annotation

Atlas domain: Driver Families / drivers/iommu.
Implementation status: atlas-only.
IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.