drivers/iommu/arm/Kconfig

# SPDX-License-Identifier: GPL-2.0-only
# ARM IOMMU support
config ARM_SMMU
	tristate "ARM Ltd. System MMU (SMMU) Support"
	depends on ARM64 || ARM || COMPILE_TEST
	depends on !GENERIC_ATOMIC64	# for IOMMU_IO_PGTABLE_LPAE
	select IOMMU_API
	select IOMMU_IO_PGTABLE_LPAE
	select ARM_DMA_USE_IOMMU if ARM
	help
	  Support for implementations of the ARM System MMU architecture
	  versions 1 and 2.

	  Say Y here if your SoC includes an IOMMU device implementing
	  the ARM SMMU architecture.

if ARM_SMMU
config ARM_SMMU_LEGACY_DT_BINDINGS
	bool "Support the legacy \"mmu-masters\" devicetree bindings"
	depends on ARM_SMMU=y && OF
	help
	  Support for the badly designed and deprecated "mmu-masters"
	  devicetree bindings. This allows some DMA masters to attach
	  to the SMMU but does not provide any support via the DMA API.
	  If you're lucky, you might be able to get VFIO up and running.

	  If you say Y here then you'll make me very sad. Instead, say N
	  and move your firmware to the utopian future that was 2016.

config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
	bool "Disable unmatched stream bypass by default" if EXPERT
	default y
	help
	  If your firmware is broken and fails to describe StreamIDs which
	  Linux should know about in order to manage the SMMU correctly and
	  securely, and you don't want to boot with the 'arm-smmu.disable_bypass=0'
	  command line parameter, then as a last resort you can turn it off
	  by default here. But don't. This option may be removed at any time.

	  Note that 'arm-smmu.disable_bypass=1' will still take precedence.

config ARM_SMMU_MMU_500_CPRE_ERRATA
	bool "Enable errata workaround for CPRE in SMMU reset path"
	default y
	help
	  Say Y here (by default) to apply workaround to disable
	  MMU-500's next-page prefetcher for sake of 4 known errata.

	  Say N here only when it is sure that any errata related to
	  prefetch enablement are not applicable on the platform.
	  Refer silicon-errata.rst for info on errata IDs.

config ARM_SMMU_QCOM
	def_tristate y
	depends on ARCH_QCOM
	select QCOM_SCM
	help
	  When running on a Qualcomm platform that has the custom variant
	  of the ARM SMMU, this needs to be built into the SMMU driver.

config ARM_SMMU_QCOM_DEBUG
	bool "ARM SMMU QCOM implementation defined debug support"
	depends on ARM_SMMU_QCOM=y
	help
	  Support for implementation specific debug features in ARM SMMU
	  hardware found in QTI platforms. This include support for
	  the Translation Buffer Units (TBU) that can be used to obtain
	  additional information when debugging memory management issues
	  like context faults.

	  Say Y here to enable debug for issues such as context faults
	  or TLB sync timeouts which requires implementation defined
	  register dumps.
endif

config ARM_SMMU_V3
	tristate "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
	depends on ARM64
	select IOMMU_API
	select IOMMU_IO_PGTABLE_LPAE
	select GENERIC_MSI_IRQ
	select IOMMUFD_DRIVER if IOMMUFD
	help
	  Support for implementations of the ARM System MMU architecture
	  version 3 providing translation support to a PCIe root complex.

	  Say Y here if your system includes an IOMMU device implementing
	  the ARM SMMUv3 architecture.

if ARM_SMMU_V3
config ARM_SMMU_V3_SVA
	bool "Shared Virtual Addressing support for the ARM SMMUv3"
	select IOMMU_SVA
	select IOMMU_IOPF
	select MMU_NOTIFIER
	help
	  Support for sharing process address spaces with devices using the
	  SMMUv3.

	  Say Y here if your system supports SVA extensions such as PCIe PASID
	  and PRI.

config ARM_SMMU_V3_IOMMUFD
	bool "Enable IOMMUFD features for ARM SMMUv3 (EXPERIMENTAL)"
	depends on IOMMUFD
	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 ARM_SMMU_V3_KUNIT_TEST
	tristate "KUnit tests for arm-smmu-v3 driver"  if !KUNIT_ALL_TESTS
	depends on KUNIT
	depends on ARM_SMMU_V3_SVA
	default KUNIT_ALL_TESTS
	help
	  Enable this option to unit-test arm-smmu-v3 driver functions.

	  If unsure, say N.

config TEGRA241_CMDQV
	bool "NVIDIA Tegra241 CMDQ-V extension support for ARM SMMUv3"
	depends on ACPI
	help
	  Support for NVIDIA CMDQ-Virtualization extension for ARM SMMUv3. The
	  CMDQ-V extension is similar to v3.3 ECMDQ for multi command queues
	  support, except with virtualization capabilities.

	  Say Y here if your system is NVIDIA Tegra241 (Grace) or it has the same
	  CMDQ-V extension.
endif

config QCOM_IOMMU
	# Note: iommu drivers cannot (yet?) be built as modules
	bool "Qualcomm IOMMU Support"
	depends on ARCH_QCOM || COMPILE_TEST
	depends on !GENERIC_ATOMIC64	# for IOMMU_IO_PGTABLE_LPAE
	select QCOM_SCM
	select IOMMU_API
	select IOMMU_IO_PGTABLE_LPAE
	select ARM_DMA_USE_IOMMU
	help
	  Support for IOMMU on certain Qualcomm SoCs.