1*cbe94c6eSJerry Snitselaar# SPDX-License-Identifier: GPL-2.0-only 2*cbe94c6eSJerry Snitselaar# AMD IOMMU support 3*cbe94c6eSJerry Snitselaarconfig AMD_IOMMU 4*cbe94c6eSJerry Snitselaar bool "AMD IOMMU support" 5*cbe94c6eSJerry Snitselaar select SWIOTLB 6*cbe94c6eSJerry Snitselaar select PCI_MSI 7*cbe94c6eSJerry Snitselaar select PCI_ATS 8*cbe94c6eSJerry Snitselaar select PCI_PRI 9*cbe94c6eSJerry Snitselaar select PCI_PASID 10*cbe94c6eSJerry Snitselaar select IOMMU_API 11*cbe94c6eSJerry Snitselaar select IOMMU_IOVA 12*cbe94c6eSJerry Snitselaar select IOMMU_DMA 13*cbe94c6eSJerry Snitselaar depends on X86_64 && PCI && ACPI 14*cbe94c6eSJerry Snitselaar help 15*cbe94c6eSJerry Snitselaar With this option you can enable support for AMD IOMMU hardware in 16*cbe94c6eSJerry Snitselaar your system. An IOMMU is a hardware component which provides 17*cbe94c6eSJerry Snitselaar remapping of DMA memory accesses from devices. With an AMD IOMMU you 18*cbe94c6eSJerry Snitselaar can isolate the DMA memory of different devices and protect the 19*cbe94c6eSJerry Snitselaar system from misbehaving device drivers or hardware. 20*cbe94c6eSJerry Snitselaar 21*cbe94c6eSJerry Snitselaar You can find out if your system has an AMD IOMMU if you look into 22*cbe94c6eSJerry Snitselaar your BIOS for an option to enable it or if you have an IVRS ACPI 23*cbe94c6eSJerry Snitselaar table. 24*cbe94c6eSJerry Snitselaar 25*cbe94c6eSJerry Snitselaarconfig AMD_IOMMU_V2 26*cbe94c6eSJerry Snitselaar tristate "AMD IOMMU Version 2 driver" 27*cbe94c6eSJerry Snitselaar depends on AMD_IOMMU 28*cbe94c6eSJerry Snitselaar select MMU_NOTIFIER 29*cbe94c6eSJerry Snitselaar help 30*cbe94c6eSJerry Snitselaar This option enables support for the AMD IOMMUv2 features of the IOMMU 31*cbe94c6eSJerry Snitselaar hardware. Select this option if you want to use devices that support 32*cbe94c6eSJerry Snitselaar the PCI PRI and PASID interface. 33*cbe94c6eSJerry Snitselaar 34*cbe94c6eSJerry Snitselaarconfig AMD_IOMMU_DEBUGFS 35*cbe94c6eSJerry Snitselaar bool "Enable AMD IOMMU internals in DebugFS" 36*cbe94c6eSJerry Snitselaar depends on AMD_IOMMU && IOMMU_DEBUGFS 37*cbe94c6eSJerry Snitselaar help 38*cbe94c6eSJerry Snitselaar !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! 39*cbe94c6eSJerry Snitselaar 40*cbe94c6eSJerry Snitselaar DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!! 41*cbe94c6eSJerry Snitselaar Exposes AMD IOMMU device internals in DebugFS. 42*cbe94c6eSJerry Snitselaar 43*cbe94c6eSJerry Snitselaar This option is -NOT- intended for production environments, and should 44*cbe94c6eSJerry Snitselaar not generally be enabled. 45