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 IOMMU_DMA
23	select PCI_ATS
24	help
25	  DMA remapping (DMAR) devices support enables independent address
26	  translations for Direct Memory Access (DMA) from devices.
27	  These DMA remapping devices are reported via ACPI tables
28	  and include PCI device scope covered by these DMA
29	  remapping devices.
30
31if INTEL_IOMMU
32
33config INTEL_IOMMU_DEBUGFS
34	bool "Export Intel IOMMU internals in Debugfs"
35	depends on IOMMU_DEBUGFS
36	select DMAR_PERF
37	select DMAR_DEBUG
38	help
39	  !!!WARNING!!!
40
41	  DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!!
42
43	  Expose Intel IOMMU internals in Debugfs.
44
45	  This option is -NOT- intended for production environments, and should
46	  only be enabled for debugging Intel IOMMU.
47
48config INTEL_IOMMU_SVM
49	bool "Support for Shared Virtual Memory with Intel IOMMU"
50	depends on X86_64
51	select PCI_PASID
52	select PCI_PRI
53	select MMU_NOTIFIER
54	select IOASID
55	select IOMMU_SVA_LIB
56	help
57	  Shared Virtual Memory (SVM) provides a facility for devices
58	  to access DMA resources through process address space by
59	  means of a Process Address Space ID (PASID).
60
61config INTEL_IOMMU_DEFAULT_ON
62	bool "Enable Intel DMA Remapping Devices by default"
63	default y
64	help
65	  Selecting this option will enable a DMAR device at boot time if
66	  one is found. If this option is not selected, DMAR support can
67	  be enabled by passing intel_iommu=on to the kernel.
68
69config INTEL_IOMMU_BROKEN_GFX_WA
70	bool "Workaround broken graphics drivers (going away soon)"
71	depends on BROKEN && X86
72	help
73	  Current Graphics drivers tend to use physical address
74	  for DMA and avoid using DMA APIs. Setting this config
75	  option permits the IOMMU driver to set a unity map for
76	  all the OS-visible memory. Hence the driver can continue
77	  to use physical addresses for DMA, at least until this
78	  option is removed in the 2.6.32 kernel.
79
80config INTEL_IOMMU_FLOPPY_WA
81	def_bool y
82	depends on X86
83	help
84	  Floppy disk drivers are known to bypass DMA API calls
85	  thereby failing to work when IOMMU is enabled. This
86	  workaround will setup a 1:1 mapping for the first
87	  16MiB to make floppy (an ISA device) work.
88
89config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
90	bool "Enable Intel IOMMU scalable mode by default"
91	default y
92	help
93	  Selecting this option will enable by default the scalable mode if
94	  hardware presents the capability. The scalable mode is defined in
95	  VT-d 3.0. The scalable mode capability could be checked by reading
96	  /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option
97	  is not selected, scalable mode support could also be enabled by
98	  passing intel_iommu=sm_on to the kernel. If not sure, please use
99	  the default value.
100
101endif # INTEL_IOMMU
102