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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 GENERIC_PT
17 select IOMMU_PT
18 select IOMMU_PT_X86_64
19 select IOMMU_PT_VTDSS
20 select IOMMU_IOVA
21 select IOMMU_IOPF
22 select IOMMUFD_DRIVER if IOMMUFD
23 select NEED_DMA_MAP_STATE
24 select DMAR_TABLE
25 select SWIOTLB
26 select PCI_ATS
27 select PCI_PRI
28 select PCI_PASID
29 help
30 DMA remapping (DMAR) devices support enables independent address
31 translations for Direct Memory Access (DMA) from devices.
32 These DMA remapping devices are reported via ACPI tables
33 and include PCI device scope covered by these DMA
34 remapping devices.
35
36if INTEL_IOMMU
37
38config INTEL_IOMMU_DEBUGFS
39 bool "Export Intel IOMMU internals in Debugfs"
40 depends on IOMMU_DEBUGFS
41 select DMAR_PERF
42 select DMAR_DEBUG
43 help
44 !!!WARNING!!!
45
46 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!!
47
48 Expose Intel IOMMU internals in Debugfs.
49
50 This option is -NOT- intended for production environments, and should
51 only be enabled for debugging Intel IOMMU.
52
53config INTEL_IOMMU_SVM
54 bool "Support for Shared Virtual Memory with Intel IOMMU"
55 depends on X86_64
56 select MMU_NOTIFIER
57 select IOMMU_SVA
58 help
59 Shared Virtual Memory (SVM) provides a facility for devices
60 to access DMA resources through process address space by
61 means of a Process Address Space ID (PASID).
62
63config INTEL_IOMMU_DEFAULT_ON
64 bool "Enable Intel DMA Remapping Devices by default"
65 default y
66 help
67 Selecting this option will enable a DMAR device at boot time if
68 one is found. If this option is not selected, DMAR support can
69 be enabled by passing intel_iommu=on to the kernel.
70
71config INTEL_IOMMU_FLOPPY_WA
72 def_bool y
73 depends on X86 && BLK_DEV_FD
74 help
75 Floppy disk drivers are known to bypass DMA API calls
76 thereby failing to work when IOMMU is enabled. This
77 workaround will setup a 1:1 mapping for the first
78 16MiB to make floppy (an ISA device) work.
79
80config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
81 bool "Enable Intel IOMMU scalable mode by default"
82 default y
83 help
84 Selecting this option will enable by default the scalable mode if
85 hardware presents the capability. The scalable mode is defined in
86 VT-d 3.0. The scalable mode capability could be checked by reading
87 /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option
88 is not selected, scalable mode support could also be enabled by
89 passing intel_iommu=sm_on to the kernel. If not sure, please use
90 the default value.
91
92config INTEL_IOMMU_PERF_EVENTS
93 bool "Intel IOMMU performance events"
94 default y
95 depends on INTEL_IOMMU && PERF_EVENTS
96 help
97 Selecting this option will enable the performance monitoring
98 infrastructure in the Intel IOMMU. It collects information about
99 key events occurring during operation of the remapping hardware,
100 to aid performance tuning and debug. These are available on modern
101 processors which support Intel VT-d 4.0 and later.
102
103endif # INTEL_IOMMU