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 || IA64)
15	select DMA_OPS
16	select IOMMU_API
17	select IOMMU_IOVA
18	select NEED_DMA_MAP_STATE
19	select DMAR_TABLE
20	select SWIOTLB
21	select IOASID
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_BROKEN_GFX_WA
68	bool "Workaround broken graphics drivers (going away soon)"
69	depends on BROKEN && X86
70	help
71	  Current Graphics drivers tend to use physical address
72	  for DMA and avoid using DMA APIs. Setting this config
73	  option permits the IOMMU driver to set a unity map for
74	  all the OS-visible memory. Hence the driver can continue
75	  to use physical addresses for DMA, at least until this
76	  option is removed in the 2.6.32 kernel.
77
78config INTEL_IOMMU_FLOPPY_WA
79	def_bool y
80	depends on X86
81	help
82	  Floppy disk drivers are known to bypass DMA API calls
83	  thereby failing to work when IOMMU is enabled. This
84	  workaround will setup a 1:1 mapping for the first
85	  16MiB to make floppy (an ISA device) work.
86
87config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
88	bool "Enable Intel IOMMU scalable mode by default"
89	default y
90	help
91	  Selecting this option will enable by default the scalable mode if
92	  hardware presents the capability. The scalable mode is defined in
93	  VT-d 3.0. The scalable mode capability could be checked by reading
94	  /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option
95	  is not selected, scalable mode support could also be enabled by
96	  passing intel_iommu=sm_on to the kernel. If not sure, please use
97	  the default value.
98
99endif # INTEL_IOMMU
100