# SPDX-License-Identifier: GPL-2.0-only # Intel IOMMU support config DMAR_TABLE bool config DMAR_PERF bool config DMAR_DEBUG bool config INTEL_IOMMU bool "Support for Intel IOMMU using DMA Remapping Devices" depends on PCI_MSI && ACPI && (X86 || IA64) select DMA_OPS select IOMMU_API select IOMMU_IOVA select NEED_DMA_MAP_STATE select DMAR_TABLE select SWIOTLB select PCI_ATS select PCI_PRI select PCI_PASID help DMA remapping (DMAR) devices support enables independent address translations for Direct Memory Access (DMA) from devices. These DMA remapping devices are reported via ACPI tables and include PCI device scope covered by these DMA remapping devices. if INTEL_IOMMU config INTEL_IOMMU_DEBUGFS bool "Export Intel IOMMU internals in Debugfs" depends on IOMMU_DEBUGFS select DMAR_PERF select DMAR_DEBUG help !!!WARNING!!! DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!! Expose Intel IOMMU internals in Debugfs. This option is -NOT- intended for production environments, and should only be enabled for debugging Intel IOMMU. config INTEL_IOMMU_SVM bool "Support for Shared Virtual Memory with Intel IOMMU" depends on X86_64 select MMU_NOTIFIER select IOMMU_SVA help Shared Virtual Memory (SVM) provides a facility for devices to access DMA resources through process address space by means of a Process Address Space ID (PASID). config INTEL_IOMMU_DEFAULT_ON bool "Enable Intel DMA Remapping Devices by default" default y help Selecting this option will enable a DMAR device at boot time if one is found. If this option is not selected, DMAR support can be enabled by passing intel_iommu=on to the kernel. config INTEL_IOMMU_BROKEN_GFX_WA bool "Workaround broken graphics drivers (going away soon)" depends on BROKEN && X86 help Current Graphics drivers tend to use physical address for DMA and avoid using DMA APIs. Setting this config option permits the IOMMU driver to set a unity map for all the OS-visible memory. Hence the driver can continue to use physical addresses for DMA, at least until this option is removed in the 2.6.32 kernel. config INTEL_IOMMU_FLOPPY_WA def_bool y depends on X86 help Floppy disk drivers are known to bypass DMA API calls thereby failing to work when IOMMU is enabled. This workaround will setup a 1:1 mapping for the first 16MiB to make floppy (an ISA device) work. config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON bool "Enable Intel IOMMU scalable mode by default" default y help Selecting this option will enable by default the scalable mode if hardware presents the capability. The scalable mode is defined in VT-d 3.0. The scalable mode capability could be checked by reading /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option is not selected, scalable mode support could also be enabled by passing intel_iommu=sm_on to the kernel. If not sure, please use the default value. config INTEL_IOMMU_PERF_EVENTS def_bool y bool "Intel IOMMU performance events" depends on INTEL_IOMMU && PERF_EVENTS help Selecting this option will enable the performance monitoring infrastructure in the Intel IOMMU. It collects information about key events occurring during operation of the remapping hardware, to aid performance tuning and debug. These are available on modern processors which support Intel VT-d 4.0 and later. endif # INTEL_IOMMU