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# 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.
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