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_ATS 38 select PCI_PRI 39 select PCI_PASID 40 select IOMMU_API 41 depends on X86_64 && PCI && ACPI 42 ---help--- 43 With this option you can enable support for AMD IOMMU hardware in 44 your system. An IOMMU is a hardware component which provides 45 remapping of DMA memory accesses from devices. With an AMD IOMMU you 46 can isolate the the DMA memory of different devices and protect the 47 system from misbehaving device drivers or hardware. 48 49 You can find out if your system has an AMD IOMMU if you look into 50 your BIOS for an option to enable it or if you have an IVRS ACPI 51 table. 52 53config AMD_IOMMU_STATS 54 bool "Export AMD IOMMU statistics to debugfs" 55 depends on AMD_IOMMU 56 select DEBUG_FS 57 ---help--- 58 This option enables code in the AMD IOMMU driver to collect various 59 statistics about whats happening in the driver and exports that 60 information to userspace via debugfs. 61 If unsure, say N. 62 63config AMD_IOMMU_V2 64 tristate "AMD IOMMU Version 2 driver (EXPERIMENTAL)" 65 depends on AMD_IOMMU && PROFILING && EXPERIMENTAL 66 select MMU_NOTIFIER 67 ---help--- 68 This option enables support for the AMD IOMMUv2 features of the IOMMU 69 hardware. Select this option if you want to use devices that support 70 the the PCI PRI and PASID interface. 71 72# Intel IOMMU support 73config DMAR_TABLE 74 bool 75 76config INTEL_IOMMU 77 bool "Support for Intel IOMMU using DMA Remapping Devices" 78 depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC) 79 select IOMMU_API 80 select DMAR_TABLE 81 help 82 DMA remapping (DMAR) devices support enables independent address 83 translations for Direct Memory Access (DMA) from devices. 84 These DMA remapping devices are reported via ACPI tables 85 and include PCI device scope covered by these DMA 86 remapping devices. 87 88config INTEL_IOMMU_DEFAULT_ON 89 def_bool y 90 prompt "Enable Intel DMA Remapping Devices by default" 91 depends on INTEL_IOMMU 92 help 93 Selecting this option will enable a DMAR device at boot time if 94 one is found. If this option is not selected, DMAR support can 95 be enabled by passing intel_iommu=on to the kernel. 96 97config INTEL_IOMMU_BROKEN_GFX_WA 98 bool "Workaround broken graphics drivers (going away soon)" 99 depends on INTEL_IOMMU && BROKEN && X86 100 ---help--- 101 Current Graphics drivers tend to use physical address 102 for DMA and avoid using DMA APIs. Setting this config 103 option permits the IOMMU driver to set a unity map for 104 all the OS-visible memory. Hence the driver can continue 105 to use physical addresses for DMA, at least until this 106 option is removed in the 2.6.32 kernel. 107 108config INTEL_IOMMU_FLOPPY_WA 109 def_bool y 110 depends on INTEL_IOMMU && X86 111 ---help--- 112 Floppy disk drivers are known to bypass DMA API calls 113 thereby failing to work when IOMMU is enabled. This 114 workaround will setup a 1:1 mapping for the first 115 16MiB to make floppy (an ISA device) work. 116 117config IRQ_REMAP 118 bool "Support for Interrupt Remapping (EXPERIMENTAL)" 119 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL 120 select DMAR_TABLE 121 ---help--- 122 Supports Interrupt remapping for IO-APIC and MSI devices. 123 To use x2apic mode in the CPU's which support x2APIC enhancements or 124 to support platforms with CPU's having > 8 bit APIC ID, say Y. 125 126# OMAP IOMMU support 127config OMAP_IOMMU 128 bool "OMAP IOMMU Support" 129 depends on ARCH_OMAP 130 select IOMMU_API 131 132config OMAP_IOVMM 133 tristate "OMAP IO Virtual Memory Manager Support" 134 depends on OMAP_IOMMU 135 136config OMAP_IOMMU_DEBUG 137 tristate "Export OMAP IOMMU/IOVMM internals in DebugFS" 138 depends on OMAP_IOVMM && DEBUG_FS 139 help 140 Select this to see extensive information about 141 the internal state of OMAP IOMMU/IOVMM in debugfs. 142 143 Say N unless you know you need this. 144 145endif # IOMMU_SUPPORT 146