linux-headers (unknown)
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 _LINUX_VIRTIO_PCIDEV_H
7 #define _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 /* _LINUX_VIRTIO_PCIDEV_H */
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