1 #ifndef _LINUX_VIRTIO_CONFIG_H
2 #define _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.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
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
27  * SUCH DAMAGE. */
28 
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 "standard-headers/linux/types.h"
33 
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
47 
48 /*
49  * Virtio feature bits VIRTIO_TRANSPORT_F_START through
50  * VIRTIO_TRANSPORT_F_END are reserved for the transport
51  * being used (e.g. virtio_ring, virtio_pci etc.), the
52  * rest are per-device feature bits.
53  */
54 #define VIRTIO_TRANSPORT_F_START	28
55 #define VIRTIO_TRANSPORT_F_END		38
56 
57 #ifndef VIRTIO_CONFIG_NO_LEGACY
58 /* Do we get callbacks when the ring is completely used, even if we've
59  * suppressed them? */
60 #define VIRTIO_F_NOTIFY_ON_EMPTY	24
61 
62 /* Can the device handle any descriptor layout? */
63 #define VIRTIO_F_ANY_LAYOUT		27
64 #endif /* VIRTIO_CONFIG_NO_LEGACY */
65 
66 /* v1.0 compliant. */
67 #define VIRTIO_F_VERSION_1		32
68 
69 /*
70  * If clear - device has the platform DMA (e.g. IOMMU) bypass quirk feature.
71  * If set - use platform DMA tools to access the memory.
72  *
73  * Note the reverse polarity (compared to most other features),
74  * this is for compatibility with legacy systems.
75  */
76 #define VIRTIO_F_ACCESS_PLATFORM	33
77 /* Legacy name for VIRTIO_F_ACCESS_PLATFORM (for compatibility with old userspace) */
78 #define VIRTIO_F_IOMMU_PLATFORM		VIRTIO_F_ACCESS_PLATFORM
79 
80 /* This feature indicates support for the packed virtqueue layout. */
81 #define VIRTIO_F_RING_PACKED		34
82 
83 /*
84  * This feature indicates that memory accesses by the driver and the
85  * device are ordered in a way described by the platform.
86  */
87 #define VIRTIO_F_ORDER_PLATFORM		36
88 
89 /*
90  * Does the device support Single Root I/O Virtualization?
91  */
92 #define VIRTIO_F_SR_IOV			37
93 #endif /* _LINUX_VIRTIO_CONFIG_H */
94