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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/uapi/linux/virtio_config.h
1 #ifndef _UAPI_LINUX_VIRTIO_CONFIG_H
2 #define _UAPI_LINUX_VIRTIO_CONFIG_H
3 /* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
4 * anyone can use the definitions to implement compatible drivers/servers.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of IBM nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 /* Virtio devices use a standardized configuration space to define their
30 * features and pass configuration information, but each implementation can
31 * store and access that space differently. */
32 #include <linux/types.h>
34 /* Status byte for guest to report progress, and synchronize features. */
35 /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
36 #define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
37 /* We have found a driver for the device. */
38 #define VIRTIO_CONFIG_S_DRIVER 2
39 /* Driver has used its parts of the config, and is happy */
40 #define VIRTIO_CONFIG_S_DRIVER_OK 4
41 /* Driver has finished configuring features */
42 #define VIRTIO_CONFIG_S_FEATURES_OK 8
43 /* Device entered invalid state, driver must reset it */
44 #define VIRTIO_CONFIG_S_NEEDS_RESET 0x40
45 /* We've given up on this device. */
46 #define VIRTIO_CONFIG_S_FAILED 0x80
48 /* Some virtio feature bits (currently bits 28 through 32) are reserved for the
49 * transport being used (eg. virtio_ring), the rest are per-device feature
51 #define VIRTIO_TRANSPORT_F_START 28
52 #define VIRTIO_TRANSPORT_F_END 34
54 #ifndef VIRTIO_CONFIG_NO_LEGACY
55 /* Do we get callbacks when the ring is completely used, even if we've
57 #define VIRTIO_F_NOTIFY_ON_EMPTY 24
59 /* Can the device handle any descriptor layout? */
60 #define VIRTIO_F_ANY_LAYOUT 27
61 #endif /* VIRTIO_CONFIG_NO_LEGACY */
64 #define VIRTIO_F_VERSION_1 32
67 * If clear - device has the IOMMU bypass quirk feature.
68 * If set - use platform tools to detect the IOMMU.
70 * Note the reverse polarity (compared to most other features),
71 * this is for compatibility with legacy systems.
73 #define VIRTIO_F_IOMMU_PLATFORM 33
74 #endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */