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_DMA 13 select IOMMU_IO_PGTABLE 14 depends on X86_64 && PCI && ACPI && HAVE_CMPXCHG_DOUBLE 15 help 16 With this option you can enable support for AMD IOMMU hardware in 17 your system. An IOMMU is a hardware component which provides 18 remapping of DMA memory accesses from devices. With an AMD IOMMU you 19 can isolate the DMA memory of different devices and protect the 20 system from misbehaving device drivers or hardware. 21 22 You can find out if your system has an AMD IOMMU if you look into 23 your BIOS for an option to enable it or if you have an IVRS ACPI 24 table. 25 26config AMD_IOMMU_V2 27 tristate "AMD IOMMU Version 2 driver" 28 depends on AMD_IOMMU 29 select MMU_NOTIFIER 30 help 31 This option enables support for the AMD IOMMUv2 features of the IOMMU 32 hardware. Select this option if you want to use devices that support 33 the PCI PRI and PASID interface. 34 35config AMD_IOMMU_DEBUGFS 36 bool "Enable AMD IOMMU internals in DebugFS" 37 depends on AMD_IOMMU && IOMMU_DEBUGFS 38 help 39 !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! 40 41 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!! 42 Exposes AMD IOMMU device internals in DebugFS. 43 44 This option is -NOT- intended for production environments, and should 45 not generally be enabled. 46