d1f2b1710d
These updates bring:
- Debugfs support for the Intel VT-d driver. When enabled, it
now also exposes some of its internal data structures to
user-space for debugging purposes.
- ARM-SMMU driver now uses the generic deferred flushing
and fast-path iova allocation code. This is expected to be a
major performance improvement, as this allocation path scales
a lot better.
- Support for r8a7744 in the Renesas iommu driver
- Couple of minor fixes and improvements all over the place
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Merge tag 'iommu-updates-v4.20' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull IOMMU updates from Joerg Roedel:
- Debugfs support for the Intel VT-d driver.
When enabled, it now also exposes some of its internal data
structures to user-space for debugging purposes.
- ARM-SMMU driver now uses the generic deferred flushing and fast-path
iova allocation code.
This is expected to be a major performance improvement, as this
allocation path scales a lot better.
- Support for r8a7744 in the Renesas iommu driver
- Couple of minor fixes and improvements all over the place
* tag 'iommu-updates-v4.20' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (39 commits)
iommu/arm-smmu-v3: Remove unnecessary wrapper function
iommu/arm-smmu-v3: Add SPDX header
iommu/amd: Add default branch in amd_iommu_capable()
dt-bindings: iommu: ipmmu-vmsa: Add r8a7744 support
iommu/amd: Move iommu_init_pci() to .init section
iommu/arm-smmu: Support non-strict mode
iommu/io-pgtable-arm-v7s: Add support for non-strict mode
iommu/arm-smmu-v3: Add support for non-strict mode
iommu/io-pgtable-arm: Add support for non-strict mode
iommu: Add "iommu.strict" command line option
iommu/dma: Add support for non-strict mode
iommu/arm-smmu: Ensure that page-table updates are visible before TLBI
iommu/arm-smmu-v3: Implement flush_iotlb_all hook
iommu/arm-smmu-v3: Avoid back-to-back CMD_SYNC operations
iommu/arm-smmu-v3: Fix unexpected CMD_SYNC timeout
iommu/io-pgtable-arm: Fix race handling in split_blk_unmap()
iommu/arm-smmu-v3: Fix a couple of minor comment typos
iommu: Fix a typo
iommu: Remove .domain_{get,set}_windows
iommu: Tidy up window attributes
...
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# IOMMU_API always gets selected by whoever wants it.
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config IOMMU_API
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bool
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menuconfig IOMMU_SUPPORT
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bool "IOMMU Hardware Support"
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depends on MMU
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default y
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---help---
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Say Y here if you want to compile device drivers for IO Memory
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Management Units into the kernel. These devices usually allow to
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remap DMA requests and/or remap interrupts from other devices on the
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system.
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if IOMMU_SUPPORT
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menu "Generic IOMMU Pagetable Support"
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# Selected by the actual pagetable implementations
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config IOMMU_IO_PGTABLE
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bool
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config IOMMU_IO_PGTABLE_LPAE
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bool "ARMv7/v8 Long Descriptor Format"
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select IOMMU_IO_PGTABLE
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depends on ARM || ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64)
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help
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Enable support for the ARM long descriptor pagetable format.
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This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page
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sizes at both stage-1 and stage-2, as well as address spaces
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up to 48-bits in size.
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config IOMMU_IO_PGTABLE_LPAE_SELFTEST
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bool "LPAE selftests"
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depends on IOMMU_IO_PGTABLE_LPAE
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help
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Enable self-tests for LPAE page table allocator. This performs
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a series of page-table consistency checks during boot.
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If unsure, say N here.
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config IOMMU_IO_PGTABLE_ARMV7S
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bool "ARMv7/v8 Short Descriptor Format"
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select IOMMU_IO_PGTABLE
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depends on ARM || ARM64 || COMPILE_TEST
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help
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Enable support for the ARM Short-descriptor pagetable format.
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This supports 32-bit virtual and physical addresses mapped using
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2-level tables with 4KB pages/1MB sections, and contiguous entries
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for 64KB pages/16MB supersections if indicated by the IOMMU driver.
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config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
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bool "ARMv7s selftests"
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depends on IOMMU_IO_PGTABLE_ARMV7S
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help
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Enable self-tests for ARMv7s page table allocator. This performs
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a series of page-table consistency checks during boot.
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If unsure, say N here.
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endmenu
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config IOMMU_DEBUGFS
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bool "Export IOMMU internals in DebugFS"
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depends on DEBUG_FS
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help
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Allows exposure of IOMMU device internals. This option enables
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the use of debugfs by IOMMU drivers as required. Devices can,
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at initialization time, cause the IOMMU code to create a top-level
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debug/iommu directory, and then populate a subdirectory with
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entries as required.
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config IOMMU_DEFAULT_PASSTHROUGH
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bool "IOMMU passthrough by default"
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depends on IOMMU_API
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help
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Enable passthrough by default, removing the need to pass in
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iommu.passthrough=on or iommu=pt through command line. If this
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is enabled, you can still disable with iommu.passthrough=off
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or iommu=nopt depending on the architecture.
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If unsure, say N here.
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config IOMMU_IOVA
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tristate
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config OF_IOMMU
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def_bool y
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depends on OF && IOMMU_API
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# IOMMU-agnostic DMA-mapping layer
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config IOMMU_DMA
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bool
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select IOMMU_API
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select IOMMU_IOVA
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select NEED_SG_DMA_LENGTH
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config FSL_PAMU
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bool "Freescale IOMMU support"
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depends on PCI
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depends on PHYS_64BIT
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depends on PPC_E500MC || (COMPILE_TEST && PPC)
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select IOMMU_API
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select GENERIC_ALLOCATOR
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help
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Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms.
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PAMU can authorize memory access, remap the memory address, and remap I/O
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transaction types.
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# MSM IOMMU support
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config MSM_IOMMU
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bool "MSM IOMMU Support"
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depends on ARM
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depends on ARCH_MSM8X60 || ARCH_MSM8960 || COMPILE_TEST
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select IOMMU_API
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select IOMMU_IO_PGTABLE_ARMV7S
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help
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Support for the IOMMUs found on certain Qualcomm SOCs.
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These IOMMUs allow virtualization of the address space used by most
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cores within the multimedia subsystem.
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If unsure, say N here.
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config IOMMU_PGTABLES_L2
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def_bool y
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depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n
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# AMD IOMMU support
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config AMD_IOMMU
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bool "AMD IOMMU support"
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select SWIOTLB
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select PCI_MSI
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select PCI_ATS
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select PCI_PRI
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select PCI_PASID
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select IOMMU_API
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select IOMMU_IOVA
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depends on X86_64 && PCI && ACPI
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---help---
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With this option you can enable support for AMD IOMMU hardware in
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your system. An IOMMU is a hardware component which provides
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remapping of DMA memory accesses from devices. With an AMD IOMMU you
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can isolate the DMA memory of different devices and protect the
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system from misbehaving device drivers or hardware.
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You can find out if your system has an AMD IOMMU if you look into
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your BIOS for an option to enable it or if you have an IVRS ACPI
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table.
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config AMD_IOMMU_V2
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tristate "AMD IOMMU Version 2 driver"
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depends on AMD_IOMMU
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select MMU_NOTIFIER
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---help---
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This option enables support for the AMD IOMMUv2 features of the IOMMU
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hardware. Select this option if you want to use devices that support
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the PCI PRI and PASID interface.
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config AMD_IOMMU_DEBUGFS
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bool "Enable AMD IOMMU internals in DebugFS"
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depends on AMD_IOMMU && IOMMU_DEBUGFS
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---help---
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!!!WARNING!!! !!!WARNING!!! !!!WARNING!!! !!!WARNING!!!
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DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!!
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Exposes AMD IOMMU device internals in DebugFS.
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This option is -NOT- intended for production environments, and should
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not generally be enabled.
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# Intel IOMMU support
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config DMAR_TABLE
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bool
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config INTEL_IOMMU
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bool "Support for Intel IOMMU using DMA Remapping Devices"
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depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC)
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select IOMMU_API
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select IOMMU_IOVA
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select NEED_DMA_MAP_STATE
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select DMAR_TABLE
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help
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DMA remapping (DMAR) devices support enables independent address
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translations for Direct Memory Access (DMA) from devices.
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These DMA remapping devices are reported via ACPI tables
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and include PCI device scope covered by these DMA
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remapping devices.
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config INTEL_IOMMU_DEBUGFS
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bool "Export Intel IOMMU internals in Debugfs"
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depends on INTEL_IOMMU && IOMMU_DEBUGFS
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help
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!!!WARNING!!!
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DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!!
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Expose Intel IOMMU internals in Debugfs.
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This option is -NOT- intended for production environments, and should
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only be enabled for debugging Intel IOMMU.
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config INTEL_IOMMU_SVM
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bool "Support for Shared Virtual Memory with Intel IOMMU"
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depends on INTEL_IOMMU && X86
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select PCI_PASID
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select MMU_NOTIFIER
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help
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Shared Virtual Memory (SVM) provides a facility for devices
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to access DMA resources through process address space by
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means of a Process Address Space ID (PASID).
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config INTEL_IOMMU_DEFAULT_ON
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def_bool y
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prompt "Enable Intel DMA Remapping Devices by default"
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depends on INTEL_IOMMU
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help
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Selecting this option will enable a DMAR device at boot time if
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one is found. If this option is not selected, DMAR support can
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be enabled by passing intel_iommu=on to the kernel.
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config INTEL_IOMMU_BROKEN_GFX_WA
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bool "Workaround broken graphics drivers (going away soon)"
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depends on INTEL_IOMMU && BROKEN && X86
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---help---
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Current Graphics drivers tend to use physical address
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for DMA and avoid using DMA APIs. Setting this config
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option permits the IOMMU driver to set a unity map for
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all the OS-visible memory. Hence the driver can continue
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to use physical addresses for DMA, at least until this
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option is removed in the 2.6.32 kernel.
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config INTEL_IOMMU_FLOPPY_WA
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def_bool y
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depends on INTEL_IOMMU && X86
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---help---
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Floppy disk drivers are known to bypass DMA API calls
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thereby failing to work when IOMMU is enabled. This
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workaround will setup a 1:1 mapping for the first
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16MiB to make floppy (an ISA device) work.
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config IRQ_REMAP
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bool "Support for Interrupt Remapping"
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depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
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select DMAR_TABLE
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---help---
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Supports Interrupt remapping for IO-APIC and MSI devices.
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To use x2apic mode in the CPU's which support x2APIC enhancements or
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to support platforms with CPU's having > 8 bit APIC ID, say Y.
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# OMAP IOMMU support
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config OMAP_IOMMU
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bool "OMAP IOMMU Support"
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depends on ARM && MMU
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depends on ARCH_OMAP2PLUS || COMPILE_TEST
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select IOMMU_API
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---help---
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The OMAP3 media platform drivers depend on iommu support,
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if you need them say Y here.
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config OMAP_IOMMU_DEBUG
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bool "Export OMAP IOMMU internals in DebugFS"
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depends on OMAP_IOMMU && DEBUG_FS
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---help---
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Select this to see extensive information about
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the internal state of OMAP IOMMU in debugfs.
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Say N unless you know you need this.
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config ROCKCHIP_IOMMU
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bool "Rockchip IOMMU Support"
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depends on ARM || ARM64
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depends on ARCH_ROCKCHIP || COMPILE_TEST
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select IOMMU_API
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select ARM_DMA_USE_IOMMU
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help
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Support for IOMMUs found on Rockchip rk32xx SOCs.
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These IOMMUs allow virtualization of the address space used by most
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cores within the multimedia subsystem.
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Say Y here if you are using a Rockchip SoC that includes an IOMMU
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device.
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config TEGRA_IOMMU_GART
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bool "Tegra GART IOMMU Support"
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depends on ARCH_TEGRA_2x_SOC
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select IOMMU_API
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help
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Enables support for remapping discontiguous physical memory
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shared with the operating system into contiguous I/O virtual
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space through the GART (Graphics Address Relocation Table)
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hardware included on Tegra SoCs.
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config TEGRA_IOMMU_SMMU
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bool "NVIDIA Tegra SMMU Support"
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depends on ARCH_TEGRA
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depends on TEGRA_AHB
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depends on TEGRA_MC
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select IOMMU_API
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help
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This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
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SoCs (Tegra30 up to Tegra210).
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config EXYNOS_IOMMU
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bool "Exynos IOMMU Support"
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depends on ARCH_EXYNOS && MMU
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depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
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select IOMMU_API
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select ARM_DMA_USE_IOMMU
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help
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Support for the IOMMU (System MMU) of Samsung Exynos application
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processor family. This enables H/W multimedia accelerators to see
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non-linear physical memory chunks as linear memory in their
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address space.
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If unsure, say N here.
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config EXYNOS_IOMMU_DEBUG
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bool "Debugging log for Exynos IOMMU"
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depends on EXYNOS_IOMMU
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help
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Select this to see the detailed log message that shows what
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happens in the IOMMU driver.
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Say N unless you need kernel log message for IOMMU debugging.
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config IPMMU_VMSA
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bool "Renesas VMSA-compatible IPMMU"
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depends on ARM || IOMMU_DMA
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depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64)
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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 the Renesas VMSA-compatible IPMMU found in the R-Mobile
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APE6, R-Car Gen2, and R-Car Gen3 SoCs.
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If unsure, say N.
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config SPAPR_TCE_IOMMU
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bool "sPAPR TCE IOMMU Support"
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depends on PPC_POWERNV || PPC_PSERIES
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select IOMMU_API
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help
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Enables bits of IOMMU API required by VFIO. The iommu_ops
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is not implemented as it is not necessary for VFIO.
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# ARM IOMMU support
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config ARM_SMMU
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bool "ARM Ltd. System MMU (SMMU) Support"
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depends on (ARM64 || ARM) && MMU
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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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config ARM_SMMU_V3
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bool "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_DOMAIN
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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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config S390_IOMMU
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def_bool y if S390 && PCI
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depends on S390 && PCI
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select IOMMU_API
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help
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Support for the IOMMU API for s390 PCI devices.
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config S390_CCW_IOMMU
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bool "S390 CCW IOMMU Support"
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depends on S390 && CCW
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select IOMMU_API
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help
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Enables bits of IOMMU API required by VFIO. The iommu_ops
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is not implemented as it is not necessary for VFIO.
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config S390_AP_IOMMU
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bool "S390 AP IOMMU Support"
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depends on S390 && ZCRYPT
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select IOMMU_API
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help
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Enables bits of IOMMU API required by VFIO. The iommu_ops
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is not implemented as it is not necessary for VFIO.
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config MTK_IOMMU
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bool "MTK IOMMU Support"
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depends on ARM || ARM64
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depends on ARCH_MEDIATEK || COMPILE_TEST
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select ARM_DMA_USE_IOMMU
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select IOMMU_API
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select IOMMU_DMA
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select IOMMU_IO_PGTABLE_ARMV7S
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select MEMORY
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select MTK_SMI
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help
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Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia
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Memory Management Unit. This option enables remapping of DMA memory
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accesses for the multimedia subsystem.
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If unsure, say N here.
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config MTK_IOMMU_V1
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bool "MTK IOMMU Version 1 (M4U gen1) Support"
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depends on ARM
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depends on ARCH_MEDIATEK || COMPILE_TEST
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select ARM_DMA_USE_IOMMU
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select IOMMU_API
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select MEMORY
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select MTK_SMI
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help
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Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
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Multimedia Memory Managememt Unit. This option enables remapping of
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DMA memory accesses for the multimedia subsystem.
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if unsure, say N here.
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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 && !GENERIC_ATOMIC64)
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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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endif # IOMMU_SUPPORT
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