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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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0da188c846
There are quite a lot of options for the Arm drivers, still all buried in the top-level Kconfig. For ease of use and consistency with all the other subdirectories, break these out into drivers/arm. For similar clarity and self-consistency, also tweak the ARM_SMMU sub-options to use "if" instead of "depends", to match ARM_SMMU_V3. Lastly also clean up the slightly messy description of ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT as highlighted by Geert - by now we really shouldn't need commentary on v4.x kernel behaviour anyway - and downgrade it to EXPERT as the first step in the 6-year-old threat to remove it entirely. Cc: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Reviewed-by: Pranjal Shrivastava <praan@google.com> Link: https://lore.kernel.org/r/a614ec86ba78c09cd16e348f633f6bb38793391f.1742480488.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
145 lines
4.7 KiB
Plaintext
145 lines
4.7 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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# ARM IOMMU support
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config ARM_SMMU
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tristate "ARM Ltd. System MMU (SMMU) Support"
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depends on ARM64 || ARM || COMPILE_TEST
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depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
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select IOMMU_API
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select IOMMU_IO_PGTABLE_LPAE
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select ARM_DMA_USE_IOMMU if ARM
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help
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Support for implementations of the ARM System MMU architecture
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versions 1 and 2.
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Say Y here if your SoC includes an IOMMU device implementing
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the ARM SMMU architecture.
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if ARM_SMMU
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config ARM_SMMU_LEGACY_DT_BINDINGS
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bool "Support the legacy \"mmu-masters\" devicetree bindings"
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depends on ARM_SMMU=y && OF
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help
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Support for the badly designed and deprecated "mmu-masters"
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devicetree bindings. This allows some DMA masters to attach
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to the SMMU but does not provide any support via the DMA API.
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If you're lucky, you might be able to get VFIO up and running.
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If you say Y here then you'll make me very sad. Instead, say N
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and move your firmware to the utopian future that was 2016.
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config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
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bool "Disable unmatched stream bypass by default" if EXPERT
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default y
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help
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If your firmware is broken and fails to describe StreamIDs which
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Linux should know about in order to manage the SMMU correctly and
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securely, and you don't want to boot with the 'arm-smmu.disable_bypass=0'
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command line parameter, then as a last resort you can turn it off
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by default here. But don't. This option may be removed at any time.
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Note that 'arm-smmu.disable_bypass=1' will still take precedence.
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config ARM_SMMU_MMU_500_CPRE_ERRATA
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bool "Enable errata workaround for CPRE in SMMU reset path"
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default y
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help
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Say Y here (by default) to apply workaround to disable
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MMU-500's next-page prefetcher for sake of 4 known errata.
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Say N here only when it is sure that any errata related to
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prefetch enablement are not applicable on the platform.
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Refer silicon-errata.rst for info on errata IDs.
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config ARM_SMMU_QCOM
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def_tristate y
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depends on ARCH_QCOM
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select QCOM_SCM
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help
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When running on a Qualcomm platform that has the custom variant
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of the ARM SMMU, this needs to be built into the SMMU driver.
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config ARM_SMMU_QCOM_DEBUG
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bool "ARM SMMU QCOM implementation defined debug support"
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depends on ARM_SMMU_QCOM=y
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help
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Support for implementation specific debug features in ARM SMMU
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hardware found in QTI platforms. This include support for
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the Translation Buffer Units (TBU) that can be used to obtain
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additional information when debugging memory management issues
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like context faults.
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Say Y here to enable debug for issues such as context faults
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or TLB sync timeouts which requires implementation defined
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register dumps.
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endif
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config ARM_SMMU_V3
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tristate "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
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depends on ARM64
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select IOMMU_API
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select IOMMU_IO_PGTABLE_LPAE
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select GENERIC_MSI_IRQ
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select IOMMUFD_DRIVER if IOMMUFD
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help
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Support for implementations of the ARM System MMU architecture
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version 3 providing translation support to a PCIe root complex.
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Say Y here if your system includes an IOMMU device implementing
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the ARM SMMUv3 architecture.
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if ARM_SMMU_V3
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config ARM_SMMU_V3_SVA
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bool "Shared Virtual Addressing support for the ARM SMMUv3"
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select IOMMU_SVA
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select IOMMU_IOPF
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select MMU_NOTIFIER
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help
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Support for sharing process address spaces with devices using the
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SMMUv3.
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Say Y here if your system supports SVA extensions such as PCIe PASID
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and PRI.
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config ARM_SMMU_V3_IOMMUFD
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bool "Enable IOMMUFD features for ARM SMMUv3 (EXPERIMENTAL)"
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depends on IOMMUFD
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help
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Support for IOMMUFD features intended to support virtual machines
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with accelerated virtual IOMMUs.
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Say Y here if you are doing development and testing on this feature.
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config ARM_SMMU_V3_KUNIT_TEST
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tristate "KUnit tests for arm-smmu-v3 driver" if !KUNIT_ALL_TESTS
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depends on KUNIT
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depends on ARM_SMMU_V3_SVA
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default KUNIT_ALL_TESTS
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help
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Enable this option to unit-test arm-smmu-v3 driver functions.
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If unsure, say N.
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config TEGRA241_CMDQV
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bool "NVIDIA Tegra241 CMDQ-V extension support for ARM SMMUv3"
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depends on ACPI
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help
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Support for NVIDIA CMDQ-Virtualization extension for ARM SMMUv3. The
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CMDQ-V extension is similar to v3.3 ECMDQ for multi command queues
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support, except with virtualization capabilities.
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Say Y here if your system is NVIDIA Tegra241 (Grace) or it has the same
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CMDQ-V extension.
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endif
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config QCOM_IOMMU
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# Note: iommu drivers cannot (yet?) be built as modules
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bool "Qualcomm IOMMU Support"
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depends on ARCH_QCOM || COMPILE_TEST
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depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
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select QCOM_SCM
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select IOMMU_API
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select IOMMU_IO_PGTABLE_LPAE
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select ARM_DMA_USE_IOMMU
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help
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Support for IOMMU on certain Qualcomm SoCs.
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