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 16# MSM IOMMU support 17config MSM_IOMMU 18 bool "MSM IOMMU Support" 19 depends on ARCH_MSM8X60 || ARCH_MSM8960 20 select IOMMU_API 21 help 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. 25 26 If unsure, say N here. 27 28config IOMMU_PGTABLES_L2 29 def_bool y 30 depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n 31 32# AMD IOMMU support 33config AMD_IOMMU 34 bool "AMD IOMMU support" 35 select SWIOTLB 36 select PCI_MSI 37 select PCI_IOV 38 select IOMMU_API 39 depends on X86_64 && PCI && ACPI 40 ---help--- 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. 46 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 49 table. 50 51config AMD_IOMMU_STATS 52 bool "Export AMD IOMMU statistics to debugfs" 53 depends on AMD_IOMMU 54 select DEBUG_FS 55 ---help--- 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. 59 If unsure, say N. 60 61# Intel IOMMU support 62config DMAR 63 bool "Support for DMA Remapping Devices" 64 depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC) 65 select IOMMU_API 66 help 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 71 remapping devices. 72 73config DMAR_DEFAULT_ON 74 def_bool y 75 prompt "Enable DMA Remapping Devices by default" 76 depends on DMAR 77 help 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. 81 82config DMAR_BROKEN_GFX_WA 83 bool "Workaround broken graphics drivers (going away soon)" 84 depends on DMAR && BROKEN && X86 85 ---help--- 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. 92 93config DMAR_FLOPPY_WA 94 def_bool y 95 depends on DMAR && X86 96 ---help--- 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. 101 102config INTR_REMAP 103 bool "Support for Interrupt Remapping (EXPERIMENTAL)" 104 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL 105 ---help--- 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. 109 110endif # IOMMU_SUPPORT 111