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1# SPDX-License-Identifier: GPL-2.0-only
2# Intel IOMMU support
3config DMAR_TABLE
4 bool
5
6config DMAR_PERF
7 bool
8
9config DMAR_DEBUG
10 bool
11
12config INTEL_IOMMU
13 bool "Support for Intel IOMMU using DMA Remapping Devices"
14 depends on PCI_MSI && ACPI && X86
15 select IOMMU_API
16 select IOMMU_IOVA
17 select IOMMU_IOPF
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
32if INTEL_IOMMU
33
34config 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
49config 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 help
55 Shared Virtual Memory (SVM) provides a facility for devices
56 to access DMA resources through process address space by
57 means of a Process Address Space ID (PASID).
58
59config INTEL_IOMMU_DEFAULT_ON
60 bool "Enable Intel DMA Remapping Devices by default"
61 default y
62 help
63 Selecting this option will enable a DMAR device at boot time if
64 one is found. If this option is not selected, DMAR support can
65 be enabled by passing intel_iommu=on to the kernel.
66
67config INTEL_IOMMU_FLOPPY_WA
68 def_bool y
69 depends on X86
70 help
71 Floppy disk drivers are known to bypass DMA API calls
72 thereby failing to work when IOMMU is enabled. This
73 workaround will setup a 1:1 mapping for the first
74 16MiB to make floppy (an ISA device) work.
75
76config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
77 bool "Enable Intel IOMMU scalable mode by default"
78 default y
79 help
80 Selecting this option will enable by default the scalable mode if
81 hardware presents the capability. The scalable mode is defined in
82 VT-d 3.0. The scalable mode capability could be checked by reading
83 /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option
84 is not selected, scalable mode support could also be enabled by
85 passing intel_iommu=sm_on to the kernel. If not sure, please use
86 the default value.
87
88config INTEL_IOMMU_PERF_EVENTS
89 bool "Intel IOMMU performance events"
90 default y
91 depends on INTEL_IOMMU && PERF_EVENTS
92 help
93 Selecting this option will enable the performance monitoring
94 infrastructure in the Intel IOMMU. It collects information about
95 key events occurring during operation of the remapping hardware,
96 to aid performance tuning and debug. These are available on modern
97 processors which support Intel VT-d 4.0 and later.
98
99endif # INTEL_IOMMU