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+# SPDX-License-Identifier: GPL-2.0-only
+# The IOVA library may also be used by non-IOMMU_API users
+config IOMMU_IOVA
+ tristate
+
+# IOMMU_API always gets selected by whoever wants it.
+config IOMMU_API
+ bool
+
+menuconfig IOMMU_SUPPORT
+ bool "IOMMU Hardware Support"
+ depends on MMU
+ default y
+ help
+ Say Y here if you want to compile device drivers for IO Memory
+ Management Units into the kernel. These devices usually allow to
+ remap DMA requests and/or remap interrupts from other devices on the
+ system.
+
+if IOMMU_SUPPORT
+
+menu "Generic IOMMU Pagetable Support"
+
+# Selected by the actual pagetable implementations
+config IOMMU_IO_PGTABLE
+ bool
+
+config IOMMU_IO_PGTABLE_LPAE
+ bool "ARMv7/v8 Long Descriptor Format"
+ select IOMMU_IO_PGTABLE
+ depends on ARM || ARM64 || COMPILE_TEST
+ depends on !GENERIC_ATOMIC64 # for cmpxchg64()
+ help
+ Enable support for the ARM long descriptor pagetable format.
+ This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page
+ sizes at both stage-1 and stage-2, as well as address spaces
+ up to 48-bits in size.
+
+config IOMMU_IO_PGTABLE_LPAE_SELFTEST
+ bool "LPAE selftests"
+ depends on IOMMU_IO_PGTABLE_LPAE
+ help
+ Enable self-tests for LPAE page table allocator. This performs
+ a series of page-table consistency checks during boot.
+
+ If unsure, say N here.
+
+config IOMMU_IO_PGTABLE_ARMV7S
+ bool "ARMv7/v8 Short Descriptor Format"
+ select IOMMU_IO_PGTABLE
+ depends on ARM || ARM64 || COMPILE_TEST
+ help
+ Enable support for the ARM Short-descriptor pagetable format.
+ This supports 32-bit virtual and physical addresses mapped using
+ 2-level tables with 4KB pages/1MB sections, and contiguous entries
+ for 64KB pages/16MB supersections if indicated by the IOMMU driver.
+
+config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
+ bool "ARMv7s selftests"
+ depends on IOMMU_IO_PGTABLE_ARMV7S
+ help
+ Enable self-tests for ARMv7s page table allocator. This performs
+ a series of page-table consistency checks during boot.
+
+ If unsure, say N here.
+
+config IOMMU_IO_PGTABLE_DART
+ bool "Apple DART Formats"
+ select IOMMU_IO_PGTABLE
+ depends on ARM64 || COMPILE_TEST
+ depends on !GENERIC_ATOMIC64 # for cmpxchg64()
+ help
+ Enable support for the Apple DART pagetable formats. These include
+ the t8020 and t6000/t8110 DART formats used in Apple M1/M2 family
+ SoCs.
+
+ If unsure, say N here.
+
+endmenu
+
+config IOMMU_DEBUGFS
+ bool "Export IOMMU internals in DebugFS"
+ depends on DEBUG_FS
+ help
+ Allows exposure of IOMMU device internals. This option enables
+ the use of debugfs by IOMMU drivers as required. Devices can,
+ at initialization time, cause the IOMMU code to create a top-level
+ debug/iommu directory, and then populate a subdirectory with
+ entries as required.
+
+choice
+ prompt "IOMMU default domain type"
+ depends on IOMMU_API
+ default IOMMU_DEFAULT_DMA_LAZY if X86 || IA64
+ default IOMMU_DEFAULT_DMA_STRICT
+ help
+ Choose the type of IOMMU domain used to manage DMA API usage by
+ device drivers. The options here typically represent different
+ levels of tradeoff between robustness/security and performance,
+ depending on the IOMMU driver. Not all IOMMUs support all options.
+ This choice can be overridden at boot via the command line, and for
+ some devices also at runtime via sysfs.
+
+ If unsure, keep the default.
+
+config IOMMU_DEFAULT_DMA_STRICT
+ bool "Translated - Strict"
+ help
+ Trusted devices use translation to restrict their access to only
+ DMA-mapped pages, with strict TLB invalidation on unmap. Equivalent
+ to passing "iommu.passthrough=0 iommu.strict=1" on the command line.
+
+ Untrusted devices always use this mode, with an additional layer of
+ bounce-buffering such that they cannot gain access to any unrelated
+ data within a mapped page.
+
+config IOMMU_DEFAULT_DMA_LAZY
+ bool "Translated - Lazy"
+ help
+ Trusted devices use translation to restrict their access to only
+ DMA-mapped pages, but with "lazy" batched TLB invalidation. This
+ mode allows higher performance with some IOMMUs due to reduced TLB
+ flushing, but at the cost of reduced isolation since devices may be
+ able to access memory for some time after it has been unmapped.
+ Equivalent to passing "iommu.passthrough=0 iommu.strict=0" on the
+ command line.
+
+ If this mode is not supported by the IOMMU driver, the effective
+ runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
+
+config IOMMU_DEFAULT_PASSTHROUGH
+ bool "Passthrough"
+ help
+ Trusted devices are identity-mapped, giving them unrestricted access
+ to memory with minimal performance overhead. Equivalent to passing
+ "iommu.passthrough=1" (historically "iommu=pt") on the command line.
+
+ If this mode is not supported by the IOMMU driver, the effective
+ runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
+
+endchoice
+
+config OF_IOMMU
+ def_bool y
+ depends on OF && IOMMU_API
+
+# IOMMU-agnostic DMA-mapping layer
+config IOMMU_DMA
+ def_bool ARM64 || IA64 || X86
+ select DMA_OPS
+ select IOMMU_API
+ select IOMMU_IOVA
+ select IRQ_MSI_IOMMU
+ select NEED_SG_DMA_LENGTH
+ select NEED_SG_DMA_FLAGS if SWIOTLB
+
+# Shared Virtual Addressing
+config IOMMU_SVA
+ bool
+
+config FSL_PAMU
+ bool "Freescale IOMMU support"
+ depends on PCI
+ depends on PHYS_64BIT
+ depends on PPC_E500MC || (COMPILE_TEST && PPC)
+ select IOMMU_API
+ select GENERIC_ALLOCATOR
+ help
+ Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms.
+ PAMU can authorize memory access, remap the memory address, and remap I/O
+ transaction types.
+
+# MSM IOMMU support
+config MSM_IOMMU
+ bool "MSM IOMMU Support"
+ depends on ARM
+ depends on ARCH_MSM8X60 || ARCH_MSM8960 || COMPILE_TEST
+ select IOMMU_API
+ select IOMMU_IO_PGTABLE_ARMV7S
+ help
+ Support for the IOMMUs found on certain Qualcomm SOCs.
+ These IOMMUs allow virtualization of the address space used by most
+ cores within the multimedia subsystem.
+
+ If unsure, say N here.
+
+source "drivers/iommu/amd/Kconfig"
+source "drivers/iommu/intel/Kconfig"
+source "drivers/iommu/iommufd/Kconfig"
+
+config IRQ_REMAP
+ bool "Support for Interrupt Remapping"
+ depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
+ select DMAR_TABLE
+ help
+ Supports Interrupt remapping for IO-APIC and MSI devices.
+ To use x2apic mode in the CPU's which support x2APIC enhancements or
+ to support platforms with CPU's having > 8 bit APIC ID, say Y.
+
+# OMAP IOMMU support
+config OMAP_IOMMU
+ bool "OMAP IOMMU Support"
+ depends on ARCH_OMAP2PLUS || COMPILE_TEST
+ select IOMMU_API
+ help
+ The OMAP3 media platform drivers depend on iommu support,
+ if you need them say Y here.
+
+config OMAP_IOMMU_DEBUG
+ bool "Export OMAP IOMMU internals in DebugFS"
+ depends on OMAP_IOMMU && DEBUG_FS
+ help
+ Select this to see extensive information about
+ the internal state of OMAP IOMMU in debugfs.
+
+ Say N unless you know you need this.
+
+config ROCKCHIP_IOMMU
+ bool "Rockchip IOMMU Support"
+ depends on ARCH_ROCKCHIP || COMPILE_TEST
+ select IOMMU_API
+ select ARM_DMA_USE_IOMMU
+ help
+ Support for IOMMUs found on Rockchip rk32xx SOCs.
+ These IOMMUs allow virtualization of the address space used by most
+ cores within the multimedia subsystem.
+ Say Y here if you are using a Rockchip SoC that includes an IOMMU
+ device.
+
+config SUN50I_IOMMU
+ bool "Allwinner H6 IOMMU Support"
+ depends on HAS_DMA
+ depends on ARCH_SUNXI || COMPILE_TEST
+ select ARM_DMA_USE_IOMMU
+ select IOMMU_API
+ help
+ Support for the IOMMU introduced in the Allwinner H6 SoCs.
+
+config TEGRA_IOMMU_GART
+ bool "Tegra GART IOMMU Support"
+ depends on ARCH_TEGRA_2x_SOC
+ depends on TEGRA_MC
+ select IOMMU_API
+ help
+ Enables support for remapping discontiguous physical memory
+ shared with the operating system into contiguous I/O virtual
+ space through the GART (Graphics Address Relocation Table)
+ hardware included on Tegra SoCs.
+
+config TEGRA_IOMMU_SMMU
+ bool "NVIDIA Tegra SMMU Support"
+ depends on ARCH_TEGRA
+ depends on TEGRA_AHB
+ depends on TEGRA_MC
+ select IOMMU_API
+ help
+ This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
+ SoCs (Tegra30 up to Tegra210).
+
+config EXYNOS_IOMMU
+ bool "Exynos IOMMU Support"
+ depends on ARCH_EXYNOS || COMPILE_TEST
+ depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
+ select IOMMU_API
+ select ARM_DMA_USE_IOMMU
+ help
+ Support for the IOMMU (System MMU) of Samsung Exynos application
+ processor family. This enables H/W multimedia accelerators to see
+ non-linear physical memory chunks as linear memory in their
+ address space.
+
+ If unsure, say N here.
+
+config EXYNOS_IOMMU_DEBUG
+ bool "Debugging log for Exynos IOMMU"
+ depends on EXYNOS_IOMMU
+ help
+ Select this to see the detailed log message that shows what
+ happens in the IOMMU driver.
+
+ Say N unless you need kernel log message for IOMMU debugging.
+
+config IPMMU_VMSA
+ bool "Renesas VMSA-compatible IPMMU"
+ depends on ARCH_RENESAS || COMPILE_TEST
+ depends on ARM || ARM64 || COMPILE_TEST
+ depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
+ select IOMMU_API
+ select IOMMU_IO_PGTABLE_LPAE
+ select ARM_DMA_USE_IOMMU
+ help
+ Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile
+ APE6, R-Car Gen{2,3} and RZ/G{1,2} SoCs.
+
+ If unsure, say N.
+
+config SPAPR_TCE_IOMMU
+ bool "sPAPR TCE IOMMU Support"
+ depends on PPC_POWERNV || PPC_PSERIES
+ select IOMMU_API
+ help
+ Enables bits of IOMMU API required by VFIO. The iommu_ops
+ is not implemented as it is not necessary for VFIO.
+
+config APPLE_DART
+ tristate "Apple DART IOMMU Support"
+ depends on ARCH_APPLE || COMPILE_TEST
+ depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_DART
+ select IOMMU_API
+ select IOMMU_IO_PGTABLE_DART
+ default ARCH_APPLE
+ help
+ Support for Apple DART (Device Address Resolution Table) IOMMUs
+ found in Apple ARM SoCs like the M1.
+ This IOMMU is required for most peripherals using DMA to access
+ the main memory.
+
+ Say Y here if you are using an Apple SoC.
+
+# 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.
+
+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 "Default to disabling bypass on ARM SMMU v1 and v2"
+ depends on ARM_SMMU
+ default y
+ help
+ Say Y here to (by default) disable bypass streams such that
+ incoming transactions from devices that are not attached to
+ an iommu domain will report an abort back to the device and
+ will not be allowed to pass through the SMMU.
+
+ Any old kernels that existed before this KConfig was
+ introduced would default to _allowing_ bypass (AKA the
+ equivalent of NO for this config). However the default for
+ this option is YES because the old behavior is insecure.
+
+ There are few reasons to allow unmatched stream bypass, and
+ even fewer good ones. If saying YES here breaks your board
+ you should work on fixing your board. This KConfig option
+ is expected to be removed in the future and we'll simply
+ hardcode the bypass disable in the code.
+
+ NOTE: the kernel command line parameter
+ 'arm-smmu.disable_bypass' will continue to override this
+ config.
+
+config ARM_SMMU_QCOM
+ def_tristate y
+ depends on ARM_SMMU && 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
+ help
+ Support for implementation specific debug features in ARM SMMU
+ hardware found in QTI platforms.
+
+ Say Y here to enable debug for issues such as TLB sync timeouts
+ which requires implementation defined register dumps.
+
+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
+ 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.
+
+config ARM_SMMU_V3_SVA
+ bool "Shared Virtual Addressing support for the ARM SMMUv3"
+ depends on ARM_SMMU_V3
+ select IOMMU_SVA
+ 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 S390_IOMMU
+ def_bool y if S390 && PCI
+ depends on S390 && PCI
+ select IOMMU_API
+ help
+ Support for the IOMMU API for s390 PCI devices.
+
+config MTK_IOMMU
+ tristate "MediaTek IOMMU Support"
+ depends on ARCH_MEDIATEK || COMPILE_TEST
+ select ARM_DMA_USE_IOMMU
+ select IOMMU_API
+ select IOMMU_IO_PGTABLE_ARMV7S
+ select MEMORY
+ select MTK_SMI
+ help
+ Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia
+ Memory Management Unit. This option enables remapping of DMA memory
+ accesses for the multimedia subsystem.
+
+ If unsure, say N here.
+
+config MTK_IOMMU_V1
+ tristate "MediaTek IOMMU Version 1 (M4U gen1) Support"
+ depends on ARM
+ depends on ARCH_MEDIATEK || COMPILE_TEST
+ select ARM_DMA_USE_IOMMU
+ select IOMMU_API
+ select MEMORY
+ select MTK_SMI
+ help
+ Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
+ Multimedia Memory Managememt Unit. This option enables remapping of
+ DMA memory accesses for the multimedia subsystem.
+
+ if unsure, say N here.
+
+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.
+
+config HYPERV_IOMMU
+ bool "Hyper-V IRQ Handling"
+ depends on HYPERV && X86
+ select IOMMU_API
+ default HYPERV
+ help
+ Stub IOMMU driver to handle IRQs to support Hyper-V Linux
+ guest and root partitions.
+
+config VIRTIO_IOMMU
+ tristate "Virtio IOMMU driver"
+ depends on VIRTIO
+ depends on (ARM64 || X86)
+ select IOMMU_API
+ select INTERVAL_TREE
+ select ACPI_VIOT if ACPI
+ help
+ Para-virtualised IOMMU driver with virtio.
+
+ Say Y here if you intend to run this kernel as a guest.
+
+config SPRD_IOMMU
+ tristate "Unisoc IOMMU Support"
+ depends on ARCH_SPRD || COMPILE_TEST
+ select IOMMU_API
+ help
+ Support for IOMMU on Unisoc's SoCs, this IOMMU can be used by
+ Unisoc's multimedia devices, such as display, Image codec(jpeg)
+ and a few signal processors, including VSP(video), GSP(graphic),
+ ISP(image), and CPP(camera pixel processor), etc.
+
+ Say Y here if you want to use the multimedia devices listed above.
+
+endif # IOMMU_SUPPORT