1 /* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
3 * Copyright (C) 2021 Intel Corporation
4 * Author: Johannes Berg <johannes@sipsolutions.net>
6 #ifndef _UAPI_LINUX_VIRTIO_PCIDEV_H
7 #define _UAPI_LINUX_VIRTIO_PCIDEV_H
8 #include <linux/types.h>
11 * enum virtio_pcidev_ops - virtual PCI device operations
12 * @VIRTIO_PCIDEV_OP_RESERVED: reserved to catch errors
13 * @VIRTIO_PCIDEV_OP_CFG_READ: read config space, size is 1, 2, 4 or 8;
14 * the @data field should be filled in by the device (in little endian).
15 * @VIRTIO_PCIDEV_OP_CFG_WRITE: write config space, size is 1, 2, 4 or 8;
16 * the @data field contains the data to write (in little endian).
17 * @VIRTIO_PCIDEV_OP_MMIO_READ: read BAR mem/pio, size can be variable;
18 * the @data field should be filled in by the device (in little endian).
19 * @VIRTIO_PCIDEV_OP_MMIO_WRITE: write BAR mem/pio, size can be variable;
20 * the @data field contains the data to write (in little endian).
21 * @VIRTIO_PCIDEV_OP_MMIO_MEMSET: memset MMIO, size is variable but
22 * the @data field only has one byte (unlike @VIRTIO_PCIDEV_OP_MMIO_WRITE)
23 * @VIRTIO_PCIDEV_OP_INT: legacy INTx# pin interrupt, the addr field is 1-4 for
25 * @VIRTIO_PCIDEV_OP_MSI: MSI(-X) interrupt, this message basically transports
26 * the 16- or 32-bit write that would otherwise be done into memory,
27 * analogous to the write messages (@VIRTIO_PCIDEV_OP_MMIO_WRITE) above
28 * @VIRTIO_PCIDEV_OP_PME: Dummy message whose content is ignored (and should be
29 * all zeroes) to signal the PME# pin.
31 enum virtio_pcidev_ops {
32 VIRTIO_PCIDEV_OP_RESERVED = 0,
33 VIRTIO_PCIDEV_OP_CFG_READ,
34 VIRTIO_PCIDEV_OP_CFG_WRITE,
35 VIRTIO_PCIDEV_OP_MMIO_READ,
36 VIRTIO_PCIDEV_OP_MMIO_WRITE,
37 VIRTIO_PCIDEV_OP_MMIO_MEMSET,
44 * struct virtio_pcidev_msg - virtio PCI device operation
45 * @op: the operation to do
46 * @bar: the bar (only with BAR read/write messages)
48 * @size: the size of the read/write (in bytes)
49 * @addr: the address to read/write
50 * @data: the data, normally @size long, but just one byte for
51 * %VIRTIO_PCIDEV_OP_MMIO_MEMSET
53 * Note: the fields are all in native (CPU) endian, however, the
54 * @data values will often be in little endian (see the ops above.)
56 struct virtio_pcidev_msg {
65 #endif /* _UAPI_LINUX_VIRTIO_PCIDEV_H */