[PATCH v3 4/6] iommu/virtio: Add topology definitions
From: Jean-Philippe Brucker <hidden>
Date: 2020-08-21 13:16:27
Also in:
linux-iommu, linux-pci
Subsystem:
the rest, virtio core, virtio iommu driver · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang, Jean-Philippe Brucker
Add struct definitions for describing endpoints managed by the virtio-iommu. When VIRTIO_IOMMU_F_TOPOLOGY is offered, an array of virtio_iommu_topo_* structures in config space describes the endpoints, identified either by their PCI BDF or their physical MMIO address. Signed-off-by: Jean-Philippe Brucker <redacted> --- include/uapi/linux/virtio_iommu.h | 44 +++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+)
diff --git a/include/uapi/linux/virtio_iommu.h b/include/uapi/linux/virtio_iommu.h
index 237e36a280cb..70cba30644d5 100644
--- a/include/uapi/linux/virtio_iommu.h
+++ b/include/uapi/linux/virtio_iommu.h@@ -16,6 +16,7 @@ #define VIRTIO_IOMMU_F_BYPASS 3 #define VIRTIO_IOMMU_F_PROBE 4 #define VIRTIO_IOMMU_F_MMIO 5 +#define VIRTIO_IOMMU_F_TOPOLOGY 6 struct virtio_iommu_range_64 { __le64 start;
@@ -27,6 +28,17 @@ struct virtio_iommu_range_32 { __le32 end; }; +struct virtio_iommu_topo_config { + /* Number of topology description structures */ + __le16 count; + /* + * Offset to the first topology description structure + * (virtio_iommu_topo_*) from the start of the virtio_iommu config + * space. Aligned on 8 bytes. + */ + __le16 offset; +}; + struct virtio_iommu_config { /* Supported page sizes */ __le64 page_size_mask;
@@ -36,6 +48,38 @@ struct virtio_iommu_config { struct virtio_iommu_range_32 domain_range; /* Probe buffer size */ __le32 probe_size; + struct virtio_iommu_topo_config topo_config; +}; + +#define VIRTIO_IOMMU_TOPO_PCI_RANGE 0x1 +#define VIRTIO_IOMMU_TOPO_MMIO 0x2 + +struct virtio_iommu_topo_pci_range { + /* VIRTIO_IOMMU_TOPO_PCI_RANGE */ + __u8 type; + __u8 reserved; + /* Length of this structure */ + __le16 length; + /* First endpoint ID in the range */ + __le32 endpoint_start; + /* PCI domain number */ + __le16 segment; + /* PCI Bus:Device.Function range */ + __le16 bdf_start; + __le16 bdf_end; + __le16 padding; +}; + +struct virtio_iommu_topo_mmio { + /* VIRTIO_IOMMU_TOPO_MMIO */ + __u8 type; + __u8 reserved; + /* Length of this structure */ + __le16 length; + /* Endpoint ID */ + __le32 endpoint; + /* Address of the first MMIO region */ + __le64 address; }; /* Request types */
--
2.28.0
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