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 select IOMMUFD_DRIVER if IOMMUFD 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_DEBUGFS 27 bool "Enable AMD IOMMU internals in DebugFS" 28 depends on AMD_IOMMU && IOMMU_DEBUGFS 29 help 30 !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! 31 32 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!! 33 Exposes AMD IOMMU device internals in DebugFS. 34 35 This option is -NOT- intended for production environments, and should 36 not generally be enabled. 37