1# SPDX-License-Identifier: GPL-2.0-only 2# AMD IOMMU support 3config AMD_IOMMU 4 bool "AMD IOMMU support" 5 select SWIOTLB 6 select PCI_MSI 7 select PCI_ATS 8 select PCI_PRI 9 select PCI_PASID 10 select IOMMU_API 11 select IOMMU_IOVA 12 select IOMMU_IO_PGTABLE 13 depends on X86_64 && PCI && ACPI && HAVE_CMPXCHG_DOUBLE 14 help 15 With this option you can enable support for AMD IOMMU hardware in 16 your system. An IOMMU is a hardware component which provides 17 remapping of DMA memory accesses from devices. With an AMD IOMMU you 18 can isolate the DMA memory of different devices and protect the 19 system from misbehaving device drivers or hardware. 20 21 You can find out if your system has an AMD IOMMU if you look into 22 your BIOS for an option to enable it or if you have an IVRS ACPI 23 table. 24 25config AMD_IOMMU_V2 26 tristate "AMD IOMMU Version 2 driver" 27 depends on AMD_IOMMU 28 select MMU_NOTIFIER 29 help 30 This option enables support for the AMD IOMMUv2 features of the IOMMU 31 hardware. Select this option if you want to use devices that support 32 the PCI PRI and PASID interface. 33 34config AMD_IOMMU_DEBUGFS 35 bool "Enable AMD IOMMU internals in DebugFS" 36 depends on AMD_IOMMU && IOMMU_DEBUGFS 37 help 38 !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! 39 40 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!! 41 Exposes AMD IOMMU device internals in DebugFS. 42 43 This option is -NOT- intended for production environments, and should 44 not generally be enabled. 45