1 /* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
2 /*
3  * Copyright (C) 2021 Intel Corporation
4  * Author: Johannes Berg <johannes@sipsolutions.net>
5  */
6 #ifndef _UAPI_LINUX_VIRTIO_PCIDEV_H
7 #define _UAPI_LINUX_VIRTIO_PCIDEV_H
8 #include <linux/types.h>
9 
10 /**
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
24  *	the number
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.
30  */
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,
38 	VIRTIO_PCIDEV_OP_INT,
39 	VIRTIO_PCIDEV_OP_MSI,
40 	VIRTIO_PCIDEV_OP_PME,
41 };
42 
43 /**
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)
47  * @reserved: reserved
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
52  *
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.)
55  */
56 struct virtio_pcidev_msg {
57 	__u8 op;
58 	__u8 bar;
59 	__u16 reserved;
60 	__u32 size;
61 	__u64 addr;
62 	__u8 data[];
63 };
64 
65 #endif /* _UAPI_LINUX_VIRTIO_PCIDEV_H */
66