drivers/iommu/intel/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 # Intel IOMMU support
   3 config DMAR_TABLE
   4         bool
   5
   6 config DMAR_PERF
   7         bool
   8
   9 config DMAR_DEBUG
  10         bool
  11
  12 config INTEL_IOMMU
  13         bool "Support for Intel IOMMU using DMA Remapping Devices"
  14         depends on PCI_MSI && ACPI && X86
  15         select DMA_OPS
  16         select IOMMU_API
  17         select IOMMU_IOVA
  18         select IOMMUFD_DRIVER if IOMMUFD
  19         select NEED_DMA_MAP_STATE
  20         select DMAR_TABLE
  21         select SWIOTLB
  22         select PCI_ATS
  23         select PCI_PRI
  24         select PCI_PASID
  25         help
  26           DMA remapping (DMAR) devices support enables independent address
  27           translations for Direct Memory Access (DMA) from devices.
  28           These DMA remapping devices are reported via ACPI tables
  29           and include PCI device scope covered by these DMA
  30           remapping devices.
  31
  32 if INTEL_IOMMU
  33
  34 config INTEL_IOMMU_DEBUGFS
  35         bool "Export Intel IOMMU internals in Debugfs"
  36         depends on IOMMU_DEBUGFS
  37         select DMAR_PERF
  38         select DMAR_DEBUG
  39         help
  40           !!!WARNING!!!
  41
  42           DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!!
  43
  44           Expose Intel IOMMU internals in Debugfs.
  45
  46           This option is -NOT- intended for production environments, and should
  47           only be enabled for debugging Intel IOMMU.
  48
  49 config INTEL_IOMMU_SVM
  50         bool "Support for Shared Virtual Memory with Intel IOMMU"
  51         depends on X86_64
  52         select MMU_NOTIFIER
  53         select IOMMU_SVA
  54         select IOMMU_IOPF
  55         help
  56           Shared Virtual Memory (SVM) provides a facility for devices
  57           to access DMA resources through process address space by
  58           means of a Process Address Space ID (PASID).
  59
  60 config INTEL_IOMMU_DEFAULT_ON
  61         bool "Enable Intel DMA Remapping Devices by default"
  62         default y
  63         help
  64           Selecting this option will enable a DMAR device at boot time if
  65           one is found. If this option is not selected, DMAR support can
  66           be enabled by passing intel_iommu=on to the kernel.
  67
  68 config INTEL_IOMMU_FLOPPY_WA
  69         def_bool y
  70         depends on X86
  71         help
  72           Floppy disk drivers are known to bypass DMA API calls
  73           thereby failing to work when IOMMU is enabled. This
  74           workaround will setup a 1:1 mapping for the first
  75           16MiB to make floppy (an ISA device) work.
  76
  77 config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
  78         bool "Enable Intel IOMMU scalable mode by default"
  79         default y
  80         help
  81           Selecting this option will enable by default the scalable mode if
  82           hardware presents the capability. The scalable mode is defined in
  83           VT-d 3.0. The scalable mode capability could be checked by reading
  84           /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option
  85           is not selected, scalable mode support could also be enabled by
  86           passing intel_iommu=sm_on to the kernel. If not sure, please use
  87           the default value.
  88
  89 config INTEL_IOMMU_PERF_EVENTS
  90         bool "Intel IOMMU performance events"
  91         default y
  92         depends on INTEL_IOMMU && PERF_EVENTS
  93         help
  94           Selecting this option will enable the performance monitoring
  95           infrastructure in the Intel IOMMU. It collects information about
  96           key events occurring during operation of the remapping hardware,
  97           to aid performance tuning and debug. These are available on modern
  98           processors which support Intel VT-d 4.0 and later.
  99
 100 endif # INTEL_IOMMU