Based on patch by Michael S. Tsirkin <[email protected]>, but I found it hard to follow so changed to use structures which are more self-documenting.
Signed-off-by: Rusty Russell <[email protected]> --- include/linux/virtio_pci.h | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/include/linux/virtio_pci.h b/include/linux/virtio_pci.h --- a/include/linux/virtio_pci.h +++ b/include/linux/virtio_pci.h @@ -92,4 +92,45 @@ /* The alignment to use between consumer and producer parts of vring. * x86 pagesize again. */ #define VIRTIO_PCI_VRING_ALIGN 4096 + +/* IDs for different capabilities. Must all exist. */ +/* FIXME: Do we win from separating ISR, NOTIFY and COMMON? */ +/* Common configuration */ +#define VIRTIO_PCI_CAP_COMMON_CFG 1 +/* Notifications */ +#define VIRTIO_PCI_CAP_NOTIFY_CFG 2 +/* ISR access */ +#define VIRTIO_PCI_CAP_ISR_CFG 3 +/* Device specific confiuration */ +#define VIRTIO_PCI_CAP_DEVICE_CFG 4 + +/* This is the PCI capability header: */ +struct virtio_pci_cap { + u8 cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */ + u8 cap_next; /* Generic PCI field: next ptr. */ + u8 cfg_type; /* One of the VIRTIO_PCI_CAP_*_CFG. */ +/* FIXME: Should we use a bir, instead of raw bar number? */ + u8 bar; /* Where to find it. */ + __le32 offset; /* Offset within bar. */ + __le32 length; /* Length. */ +}; + +/* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */ +struct virtio_pci_common_cfg { + /* About the whole device. */ + __le32 device_feature_select; /* read-write */ + __le32 device_feature; /* read-only */ + __le32 guest_feature_select; /* read-write */ + __le32 guest_feature; /* read-only */ + __le16 msix_config; /* read-write */ + __u8 device_status; /* read-write */ + __u8 unused; + + /* About a specific virtqueue. */ + __le16 queue_select; /* read-write */ + __le16 queue_align; /* read-write, power of 2. */ + __le16 queue_size; /* read-write, power of 2. */ + __le16 queue_msix_vector;/* read-write */ + __le64 queue_address; /* read-write: 0xFFFFFFFFFFFFFFFF == DNE. */ +}; #endif _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
