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Diffstat (limited to 'Documentation/devicetree/bindings/virtio/iommu.txt')
-rw-r--r-- | Documentation/devicetree/bindings/virtio/iommu.txt | 66 |
1 files changed, 0 insertions, 66 deletions
diff --git a/Documentation/devicetree/bindings/virtio/iommu.txt b/Documentation/devicetree/bindings/virtio/iommu.txt deleted file mode 100644 index 2407fea0651c..000000000000 --- a/Documentation/devicetree/bindings/virtio/iommu.txt +++ /dev/null @@ -1,66 +0,0 @@ -* virtio IOMMU PCI device - -When virtio-iommu uses the PCI transport, its programming interface is -discovered dynamically by the PCI probing infrastructure. However the -device tree statically describes the relation between IOMMU and DMA -masters. Therefore, the PCI root complex that hosts the virtio-iommu -contains a child node representing the IOMMU device explicitly. - -Required properties: - -- compatible: Should be "virtio,pci-iommu" -- reg: PCI address of the IOMMU. As defined in the PCI Bus - Binding reference [1], the reg property is a five-cell - address encoded as (phys.hi phys.mid phys.lo size.hi - size.lo). phys.hi should contain the device's BDF as - 0b00000000 bbbbbbbb dddddfff 00000000. The other cells - should be zero. -- #iommu-cells: Each platform DMA master managed by the IOMMU is assigned - an endpoint ID, described by the "iommus" property [2]. - For virtio-iommu, #iommu-cells must be 1. - -Notes: - -- DMA from the IOMMU device isn't managed by another IOMMU. Therefore the - virtio-iommu node doesn't have an "iommus" property, and is omitted from - the iommu-map property of the root complex. - -Example: - -pcie@10000000 { - compatible = "pci-host-ecam-generic"; - ... - - /* The IOMMU programming interface uses slot 00:01.0 */ - iommu0: iommu@0008 { - compatible = "virtio,pci-iommu"; - reg = <0x00000800 0 0 0 0>; - #iommu-cells = <1>; - }; - - /* - * The IOMMU manages all functions in this PCI domain except - * itself. Omit BDF 00:01.0. - */ - iommu-map = <0x0 &iommu0 0x0 0x8> - <0x9 &iommu0 0x9 0xfff7>; -}; - -pcie@20000000 { - compatible = "pci-host-ecam-generic"; - ... - /* - * The IOMMU also manages all functions from this domain, - * with endpoint IDs 0x10000 - 0x1ffff - */ - iommu-map = <0x0 &iommu0 0x10000 0x10000>; -}; - -ethernet@fe001000 { - ... - /* The IOMMU manages this platform device with endpoint ID 0x20000 */ - iommus = <&iommu0 0x20000>; -}; - -[1] Documentation/devicetree/bindings/pci/pci.txt -[2] Documentation/devicetree/bindings/iommu/iommu.txt |