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 MMU_NOTIFIER 11 select IOMMU_API 12 select IOMMU_IOVA 13 select IOMMU_IO_PGTABLE 14 select IOMMU_SVA 15 select IOMMU_IOPF 16 select IOMMUFD_DRIVER if IOMMUFD 17 depends on X86_64 && PCI && ACPI && HAVE_CMPXCHG_DOUBLE 18 help 19 With this option you can enable support for AMD IOMMU hardware in 20 your system. An IOMMU is a hardware component which provides 21 remapping of DMA memory accesses from devices. With an AMD IOMMU you 22 can isolate the DMA memory of different devices and protect the 23 system from misbehaving device drivers or hardware. 24 25 You can find out if your system has an AMD IOMMU if you look into 26 your BIOS for an option to enable it or if you have an IVRS ACPI 27 table. 28 29config AMD_IOMMU_DEBUGFS 30 bool "Enable AMD IOMMU internals in DebugFS" 31 depends on AMD_IOMMU && IOMMU_DEBUGFS 32 help 33 !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! 34 35 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!! 36 Exposes AMD IOMMU device internals in DebugFS. 37 38 This option is -NOT- intended for production environments, and should 39 not generally be enabled. 40