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Linux kernel mirror (for testing)
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1# IOMMU_API always gets selected by whoever wants it.
2config IOMMU_API
3 bool
4
5menuconfig IOMMU_SUPPORT
6 bool "IOMMU Hardware Support"
7 default y
8 ---help---
9 Say Y here if you want to compile device drivers for IO Memory
10 Management Units into the kernel. These devices usually allow to
11 remap DMA requests and/or remap interrupts from other devices on the
12 system.
13
14if IOMMU_SUPPORT
15
16config OF_IOMMU
17 def_bool y
18 depends on OF
19
20# MSM IOMMU support
21config MSM_IOMMU
22 bool "MSM IOMMU Support"
23 depends on ARCH_MSM8X60 || ARCH_MSM8960
24 select IOMMU_API
25 help
26 Support for the IOMMUs found on certain Qualcomm SOCs.
27 These IOMMUs allow virtualization of the address space used by most
28 cores within the multimedia subsystem.
29
30 If unsure, say N here.
31
32config IOMMU_PGTABLES_L2
33 def_bool y
34 depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n
35
36# AMD IOMMU support
37config AMD_IOMMU
38 bool "AMD IOMMU support"
39 select SWIOTLB
40 select PCI_MSI
41 select PCI_ATS
42 select PCI_PRI
43 select PCI_PASID
44 select IOMMU_API
45 depends on X86_64 && PCI && ACPI && X86_IO_APIC
46 ---help---
47 With this option you can enable support for AMD IOMMU hardware in
48 your system. An IOMMU is a hardware component which provides
49 remapping of DMA memory accesses from devices. With an AMD IOMMU you
50 can isolate the DMA memory of different devices and protect the
51 system from misbehaving device drivers or hardware.
52
53 You can find out if your system has an AMD IOMMU if you look into
54 your BIOS for an option to enable it or if you have an IVRS ACPI
55 table.
56
57config AMD_IOMMU_STATS
58 bool "Export AMD IOMMU statistics to debugfs"
59 depends on AMD_IOMMU
60 select DEBUG_FS
61 ---help---
62 This option enables code in the AMD IOMMU driver to collect various
63 statistics about whats happening in the driver and exports that
64 information to userspace via debugfs.
65 If unsure, say N.
66
67config AMD_IOMMU_V2
68 tristate "AMD IOMMU Version 2 driver (EXPERIMENTAL)"
69 depends on AMD_IOMMU && PROFILING && EXPERIMENTAL
70 select MMU_NOTIFIER
71 ---help---
72 This option enables support for the AMD IOMMUv2 features of the IOMMU
73 hardware. Select this option if you want to use devices that support
74 the PCI PRI and PASID interface.
75
76# Intel IOMMU support
77config DMAR_TABLE
78 bool
79
80config INTEL_IOMMU
81 bool "Support for Intel IOMMU using DMA Remapping Devices"
82 depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC)
83 select IOMMU_API
84 select DMAR_TABLE
85 help
86 DMA remapping (DMAR) devices support enables independent address
87 translations for Direct Memory Access (DMA) from devices.
88 These DMA remapping devices are reported via ACPI tables
89 and include PCI device scope covered by these DMA
90 remapping devices.
91
92config INTEL_IOMMU_DEFAULT_ON
93 def_bool y
94 prompt "Enable Intel DMA Remapping Devices by default"
95 depends on INTEL_IOMMU
96 help
97 Selecting this option will enable a DMAR device at boot time if
98 one is found. If this option is not selected, DMAR support can
99 be enabled by passing intel_iommu=on to the kernel.
100
101config INTEL_IOMMU_BROKEN_GFX_WA
102 bool "Workaround broken graphics drivers (going away soon)"
103 depends on INTEL_IOMMU && BROKEN && X86
104 ---help---
105 Current Graphics drivers tend to use physical address
106 for DMA and avoid using DMA APIs. Setting this config
107 option permits the IOMMU driver to set a unity map for
108 all the OS-visible memory. Hence the driver can continue
109 to use physical addresses for DMA, at least until this
110 option is removed in the 2.6.32 kernel.
111
112config INTEL_IOMMU_FLOPPY_WA
113 def_bool y
114 depends on INTEL_IOMMU && X86
115 ---help---
116 Floppy disk drivers are known to bypass DMA API calls
117 thereby failing to work when IOMMU is enabled. This
118 workaround will setup a 1:1 mapping for the first
119 16MiB to make floppy (an ISA device) work.
120
121config IRQ_REMAP
122 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
123 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
124 select DMAR_TABLE
125 ---help---
126 Supports Interrupt remapping for IO-APIC and MSI devices.
127 To use x2apic mode in the CPU's which support x2APIC enhancements or
128 to support platforms with CPU's having > 8 bit APIC ID, say Y.
129
130# OMAP IOMMU support
131config OMAP_IOMMU
132 bool "OMAP IOMMU Support"
133 depends on ARCH_OMAP
134 select IOMMU_API
135
136config OMAP_IOVMM
137 tristate "OMAP IO Virtual Memory Manager Support"
138 depends on OMAP_IOMMU
139
140config OMAP_IOMMU_DEBUG
141 tristate "Export OMAP IOMMU/IOVMM internals in DebugFS"
142 depends on OMAP_IOVMM && DEBUG_FS
143 help
144 Select this to see extensive information about
145 the internal state of OMAP IOMMU/IOVMM in debugfs.
146
147 Say N unless you know you need this.
148
149config TEGRA_IOMMU_GART
150 bool "Tegra GART IOMMU Support"
151 depends on ARCH_TEGRA_2x_SOC
152 select IOMMU_API
153 help
154 Enables support for remapping discontiguous physical memory
155 shared with the operating system into contiguous I/O virtual
156 space through the GART (Graphics Address Relocation Table)
157 hardware included on Tegra SoCs.
158
159config TEGRA_IOMMU_SMMU
160 bool "Tegra SMMU IOMMU Support"
161 depends on ARCH_TEGRA_3x_SOC && TEGRA_AHB
162 select IOMMU_API
163 help
164 Enables support for remapping discontiguous physical memory
165 shared with the operating system into contiguous I/O virtual
166 space through the SMMU (System Memory Management Unit)
167 hardware included on Tegra SoCs.
168
169config EXYNOS_IOMMU
170 bool "Exynos IOMMU Support"
171 depends on ARCH_EXYNOS && EXYNOS_DEV_SYSMMU
172 select IOMMU_API
173 help
174 Support for the IOMMU(System MMU) of Samsung Exynos application
175 processor family. This enables H/W multimedia accellerators to see
176 non-linear physical memory chunks as a linear memory in their
177 address spaces
178
179 If unsure, say N here.
180
181config EXYNOS_IOMMU_DEBUG
182 bool "Debugging log for Exynos IOMMU"
183 depends on EXYNOS_IOMMU
184 help
185 Select this to see the detailed log message that shows what
186 happens in the IOMMU driver
187
188 Say N unless you need kernel log message for IOMMU debugging
189
190endif # IOMMU_SUPPORT