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linux/drivers/iommu/Kconfig
Linus Torvalds 08cdc21579 iommufd for 6.2 
iommufd is the user API to control the IOMMU subsystem as it relates to
 managing IO page tables that point at user space memory.
 
 It takes over from drivers/vfio/vfio_iommu_type1.c (aka the VFIO
 container) which is the VFIO specific interface for a similar idea.
 
 We see a broad need for extended features, some being highly IOMMU device
 specific:
  - Binding iommu_domain's to PASID/SSID
  - Userspace IO page tables, for ARM, x86 and S390
  - Kernel bypassed invalidation of user page tables
  - Re-use of the KVM page table in the IOMMU
  - Dirty page tracking in the IOMMU
  - Runtime Increase/Decrease of IOPTE size
  - PRI support with faults resolved in userspace
 
 Many of these HW features exist to support VM use cases - for instance the
 combination of PASID, PRI and Userspace IO Page Tables allows an
 implementation of DMA Shared Virtual Addressing (vSVA) within a
 guest. Dirty tracking enables VM live migration with SRIOV devices and
 PASID support allow creating "scalable IOV" devices, among other things.
 
 As these features are fundamental to a VM platform they need to be
 uniformly exposed to all the driver families that do DMA into VMs, which
 is currently VFIO and VDPA.
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Merge tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd

Pull iommufd implementation from Jason Gunthorpe:
 "iommufd is the user API to control the IOMMU subsystem as it relates
  to managing IO page tables that point at user space memory.

  It takes over from drivers/vfio/vfio_iommu_type1.c (aka the VFIO
  container) which is the VFIO specific interface for a similar idea.

  We see a broad need for extended features, some being highly IOMMU
  device specific:
   - Binding iommu_domain's to PASID/SSID
   - Userspace IO page tables, for ARM, x86 and S390
   - Kernel bypassed invalidation of user page tables
   - Re-use of the KVM page table in the IOMMU
   - Dirty page tracking in the IOMMU
   - Runtime Increase/Decrease of IOPTE size
   - PRI support with faults resolved in userspace

  Many of these HW features exist to support VM use cases - for instance
  the combination of PASID, PRI and Userspace IO Page Tables allows an
  implementation of DMA Shared Virtual Addressing (vSVA) within a guest.
  Dirty tracking enables VM live migration with SRIOV devices and PASID
  support allow creating "scalable IOV" devices, among other things.

  As these features are fundamental to a VM platform they need to be
  uniformly exposed to all the driver families that do DMA into VMs,
  which is currently VFIO and VDPA"

For more background, see the extended explanations in Jason's pull request:

  https://lore.kernel.org/lkml/Y5dzTU8dlmXTbzoJ@nvidia.com/

* tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd: (62 commits)
  iommufd: Change the order of MSI setup
  iommufd: Improve a few unclear bits of code
  iommufd: Fix comment typos
  vfio: Move vfio group specific code into group.c
  vfio: Refactor dma APIs for emulated devices
  vfio: Wrap vfio group module init/clean code into helpers
  vfio: Refactor vfio_device open and close
  vfio: Make vfio_device_open() truly device specific
  vfio: Swap order of vfio_device_container_register() and open_device()
  vfio: Set device->group in helper function
  vfio: Create wrappers for group register/unregister
  vfio: Move the sanity check of the group to vfio_create_group()
  vfio: Simplify vfio_create_group()
  iommufd: Allow iommufd to supply /dev/vfio/vfio
  vfio: Make vfio_container optionally compiled
  vfio: Move container related MODULE_ALIAS statements into container.c
  vfio-iommufd: Support iommufd for emulated VFIO devices
  vfio-iommufd: Support iommufd for physical VFIO devices
  vfio-iommufd: Allow iommufd to be used in place of a container fd
  vfio: Use IOMMU_CAP_ENFORCE_CACHE_COHERENCY for vfio_file_enforced_coherent()
  ...
2022-12-14 09:15:43 -08:00

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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
# The IOASID library may also be used by non-IOMMU_API users
config IOASID
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 && !GENERIC_ATOMIC64)
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 && !GENERIC_ATOMIC64)
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
# Shared Virtual Addressing
config IOMMU_SVA
bool
select IOASID
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 && !GENERIC_ATOMIC64)
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 && !GENERIC_ATOMIC64)
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 && !GENERIC_ATOMIC64)
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 S390_CCW_IOMMU
bool "S390 CCW IOMMU Support"
depends on S390 && CCW || COMPILE_TEST
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 S390_AP_IOMMU
bool "S390 AP IOMMU Support"
depends on S390 && ZCRYPT || COMPILE_TEST
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 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 && !GENERIC_ATOMIC64)
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
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