forked from luck/tmp_suning_uos_patched
virtio-pci: define layout for virtio 1.0
Based on patches by Michael S. Tsirkin <mst@redhat.com>, but I found it hard to follow so changed to use structures which are more self-documenting. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -99,4 +99,66 @@
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/* Vector value used to disable MSI for queue */
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#define VIRTIO_MSI_NO_VECTOR 0xffff
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#ifndef VIRTIO_PCI_NO_MODERN
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/* IDs for different capabilities. Must all exist. */
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/* Common configuration */
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#define VIRTIO_PCI_CAP_COMMON_CFG 1
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/* Notifications */
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#define VIRTIO_PCI_CAP_NOTIFY_CFG 2
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/* ISR access */
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#define VIRTIO_PCI_CAP_ISR_CFG 3
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/* Device specific confiuration */
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#define VIRTIO_PCI_CAP_DEVICE_CFG 4
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/* This is the PCI capability header: */
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struct virtio_pci_cap {
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__u8 cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */
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__u8 cap_next; /* Generic PCI field: next ptr. */
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__u8 cap_len; /* Generic PCI field: capability length */
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__u8 type_and_bar; /* Upper 3 bits: bar.
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* Lower 3 is VIRTIO_PCI_CAP_*_CFG. */
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__le32 offset; /* Offset within bar. */
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__le32 length; /* Length. */
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};
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#define VIRTIO_PCI_CAP_BAR_SHIFT 5
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#define VIRTIO_PCI_CAP_BAR_MASK 0x7
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#define VIRTIO_PCI_CAP_TYPE_SHIFT 0
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#define VIRTIO_PCI_CAP_TYPE_MASK 0x7
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struct virtio_pci_notify_cap {
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struct virtio_pci_cap cap;
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__le32 notify_off_multiplier; /* Multiplier for queue_notify_off. */
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};
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/* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */
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struct virtio_pci_common_cfg {
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/* About the whole device. */
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__le32 device_feature_select; /* read-write */
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__le32 device_feature; /* read-only */
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__le32 guest_feature_select; /* read-write */
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__le32 guest_feature; /* read-write */
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__le16 msix_config; /* read-write */
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__le16 num_queues; /* read-only */
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__u8 device_status; /* read-write */
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__u8 config_generation; /* read-only */
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/* About a specific virtqueue. */
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__le16 queue_select; /* read-write */
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__le16 queue_size; /* read-write, power of 2. */
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__le16 queue_msix_vector; /* read-write */
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__le16 queue_enable; /* read-write */
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__le16 queue_notify_off; /* read-only */
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__le32 queue_desc_lo; /* read-write */
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__le32 queue_desc_hi; /* read-write */
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__le32 queue_avail_lo; /* read-write */
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__le32 queue_avail_hi; /* read-write */
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__le32 queue_used_lo; /* read-write */
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__le32 queue_used_hi; /* read-write */
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};
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#endif /* VIRTIO_PCI_NO_MODERN */
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#endif
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