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 DMAR_DEBUG 10 bool 11 12config INTEL_IOMMU 13 bool "Support for Intel IOMMU using DMA Remapping Devices" 14 depends on PCI_MSI && ACPI && (X86 || IA64) 15 select DMA_OPS 16 select IOMMU_API 17 select IOMMU_IOVA 18 select NEED_DMA_MAP_STATE 19 select DMAR_TABLE 20 select SWIOTLB 21 select IOASID 22 select PCI_ATS 23 select PCI_PRI 24 select PCI_PASID 25 help 26 DMA remapping (DMAR) devices support enables independent address 27 translations for Direct Memory Access (DMA) from devices. 28 These DMA remapping devices are reported via ACPI tables 29 and include PCI device scope covered by these DMA 30 remapping devices. 31 32if INTEL_IOMMU 33 34config INTEL_IOMMU_DEBUGFS 35 bool "Export Intel IOMMU internals in Debugfs" 36 depends on IOMMU_DEBUGFS 37 select DMAR_PERF 38 select DMAR_DEBUG 39 help 40 !!!WARNING!!! 41 42 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!! 43 44 Expose Intel IOMMU internals in Debugfs. 45 46 This option is -NOT- intended for production environments, and should 47 only be enabled for debugging Intel IOMMU. 48 49config INTEL_IOMMU_SVM 50 bool "Support for Shared Virtual Memory with Intel IOMMU" 51 depends on X86_64 52 select MMU_NOTIFIER 53 select IOMMU_SVA 54 help 55 Shared Virtual Memory (SVM) provides a facility for devices 56 to access DMA resources through process address space by 57 means of a Process Address Space ID (PASID). 58 59config INTEL_IOMMU_DEFAULT_ON 60 bool "Enable Intel DMA Remapping Devices by default" 61 default y 62 help 63 Selecting this option will enable a DMAR device at boot time if 64 one is found. If this option is not selected, DMAR support can 65 be enabled by passing intel_iommu=on to the kernel. 66 67config INTEL_IOMMU_BROKEN_GFX_WA 68 bool "Workaround broken graphics drivers (going away soon)" 69 depends on BROKEN && X86 70 help 71 Current Graphics drivers tend to use physical address 72 for DMA and avoid using DMA APIs. Setting this config 73 option permits the IOMMU driver to set a unity map for 74 all the OS-visible memory. Hence the driver can continue 75 to use physical addresses for DMA, at least until this 76 option is removed in the 2.6.32 kernel. 77 78config INTEL_IOMMU_FLOPPY_WA 79 def_bool y 80 depends on X86 81 help 82 Floppy disk drivers are known to bypass DMA API calls 83 thereby failing to work when IOMMU is enabled. This 84 workaround will setup a 1:1 mapping for the first 85 16MiB to make floppy (an ISA device) work. 86 87config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON 88 bool "Enable Intel IOMMU scalable mode by default" 89 default y 90 help 91 Selecting this option will enable by default the scalable mode if 92 hardware presents the capability. The scalable mode is defined in 93 VT-d 3.0. The scalable mode capability could be checked by reading 94 /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option 95 is not selected, scalable mode support could also be enabled by 96 passing intel_iommu=sm_on to the kernel. If not sure, please use 97 the default value. 98 99endif # INTEL_IOMMU 100