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 INTEL_IOMMU 10 bool "Support for Intel IOMMU using DMA Remapping Devices" 11 depends on PCI_MSI && ACPI && (X86 || IA64) 12 select DMA_OPS 13 select IOMMU_API 14 select IOMMU_IOVA 15 select NEED_DMA_MAP_STATE 16 select DMAR_TABLE 17 select SWIOTLB 18 select IOASID 19 select IOMMU_DMA 20 select PCI_ATS 21 help 22 DMA remapping (DMAR) devices support enables independent address 23 translations for Direct Memory Access (DMA) from devices. 24 These DMA remapping devices are reported via ACPI tables 25 and include PCI device scope covered by these DMA 26 remapping devices. 27 28if INTEL_IOMMU 29 30config INTEL_IOMMU_DEBUGFS 31 bool "Export Intel IOMMU internals in Debugfs" 32 depends on IOMMU_DEBUGFS 33 select DMAR_PERF 34 help 35 !!!WARNING!!! 36 37 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!! 38 39 Expose Intel IOMMU internals in Debugfs. 40 41 This option is -NOT- intended for production environments, and should 42 only be enabled for debugging Intel IOMMU. 43 44config INTEL_IOMMU_SVM 45 bool "Support for Shared Virtual Memory with Intel IOMMU" 46 depends on X86_64 47 select PCI_PASID 48 select PCI_PRI 49 select MMU_NOTIFIER 50 select IOASID 51 select IOMMU_SVA_LIB 52 help 53 Shared Virtual Memory (SVM) provides a facility for devices 54 to access DMA resources through process address space by 55 means of a Process Address Space ID (PASID). 56 57config INTEL_IOMMU_DEFAULT_ON 58 bool "Enable Intel DMA Remapping Devices by default" 59 default y 60 help 61 Selecting this option will enable a DMAR device at boot time if 62 one is found. If this option is not selected, DMAR support can 63 be enabled by passing intel_iommu=on to the kernel. 64 65config INTEL_IOMMU_BROKEN_GFX_WA 66 bool "Workaround broken graphics drivers (going away soon)" 67 depends on BROKEN && X86 68 help 69 Current Graphics drivers tend to use physical address 70 for DMA and avoid using DMA APIs. Setting this config 71 option permits the IOMMU driver to set a unity map for 72 all the OS-visible memory. Hence the driver can continue 73 to use physical addresses for DMA, at least until this 74 option is removed in the 2.6.32 kernel. 75 76config INTEL_IOMMU_FLOPPY_WA 77 def_bool y 78 depends on X86 79 help 80 Floppy disk drivers are known to bypass DMA API calls 81 thereby failing to work when IOMMU is enabled. This 82 workaround will setup a 1:1 mapping for the first 83 16MiB to make floppy (an ISA device) work. 84 85config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON 86 bool "Enable Intel IOMMU scalable mode by default" 87 help 88 Selecting this option will enable by default the scalable mode if 89 hardware presents the capability. The scalable mode is defined in 90 VT-d 3.0. The scalable mode capability could be checked by reading 91 /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option 92 is not selected, scalable mode support could also be enabled by 93 passing intel_iommu=sm_on to the kernel. If not sure, please use 94 the default value. 95 96endif # INTEL_IOMMU 97