1 # IOMMU_API always gets selected by whoever wants it.
5 menuconfig IOMMU_SUPPORT
6 bool "IOMMU Hardware Support"
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
18 bool "MSM IOMMU Support"
19 depends on ARCH_MSM8X60 || ARCH_MSM8960
22 Support for the IOMMUs found on certain Qualcomm SOCs.
23 These IOMMUs allow virtualization of the address space used by most
24 cores within the multimedia subsystem.
26 If unsure, say N here.
28 config IOMMU_PGTABLES_L2
30 depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n
34 bool "AMD IOMMU support"
39 depends on X86_64 && PCI && ACPI
41 With this option you can enable support for AMD IOMMU hardware in
42 your system. An IOMMU is a hardware component which provides
43 remapping of DMA memory accesses from devices. With an AMD IOMMU you
44 can isolate the the DMA memory of different devices and protect the
45 system from misbehaving device drivers or hardware.
47 You can find out if your system has an AMD IOMMU if you look into
48 your BIOS for an option to enable it or if you have an IVRS ACPI
51 config AMD_IOMMU_STATS
52 bool "Export AMD IOMMU statistics to debugfs"
56 This option enables code in the AMD IOMMU driver to collect various
57 statistics about whats happening in the driver and exports that
58 information to userspace via debugfs.
63 bool "Support for DMA Remapping Devices"
64 depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC)
67 DMA remapping (DMAR) devices support enables independent address
68 translations for Direct Memory Access (DMA) from devices.
69 These DMA remapping devices are reported via ACPI tables
70 and include PCI device scope covered by these DMA
73 config DMAR_DEFAULT_ON
75 prompt "Enable DMA Remapping Devices by default"
78 Selecting this option will enable a DMAR device at boot time if
79 one is found. If this option is not selected, DMAR support can
80 be enabled by passing intel_iommu=on to the kernel.
82 config DMAR_BROKEN_GFX_WA
83 bool "Workaround broken graphics drivers (going away soon)"
84 depends on DMAR && BROKEN && X86
86 Current Graphics drivers tend to use physical address
87 for DMA and avoid using DMA APIs. Setting this config
88 option permits the IOMMU driver to set a unity map for
89 all the OS-visible memory. Hence the driver can continue
90 to use physical addresses for DMA, at least until this
91 option is removed in the 2.6.32 kernel.
95 depends on DMAR && X86
97 Floppy disk drivers are known to bypass DMA API calls
98 thereby failing to work when IOMMU is enabled. This
99 workaround will setup a 1:1 mapping for the first
100 16MiB to make floppy (an ISA device) work.
103 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
104 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
106 Supports Interrupt remapping for IO-APIC and MSI devices.
107 To use x2apic mode in the CPU's which support x2APIC enhancements or
108 to support platforms with CPU's having > 8 bit APIC ID, say Y.
110 endif # IOMMU_SUPPORT