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. 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 33 /* Status byte for guest to report progress, and synchronize features. */ 34 /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */ 35 #define VIRTIO_CONFIG_S_ACKNOWLEDGE 1 36 /* We have found a driver for the device. */ 37 #define VIRTIO_CONFIG_S_DRIVER 2 38 /* Driver has used its parts of the config, and is happy */ 39 #define VIRTIO_CONFIG_S_DRIVER_OK 4 40 /* Driver has finished configuring features */ 41 #define VIRTIO_CONFIG_S_FEATURES_OK 8 42 /* Device entered invalid state, driver SHOULD reset it */ 43 #define VIRTIO_CONFIG_S_NEEDS_RESET 0x40 44 /* We've given up on this device. */ 45 #define VIRTIO_CONFIG_S_FAILED 0x80 46 /* virtio library features bits */ 47 48 49 /* Some virtio feature bits (currently bits 28 through 31) are reserved for the 50 * transport being used (eg. virtio_ring), the rest are per-device feature 51 * bits. */ 52 #define VIRTIO_TRANSPORT_F_START 28 53 #define VIRTIO_TRANSPORT_F_END 32 54 55 /* Do we get callbacks when the ring is completely used, even if we've 56 * suppressed them? */ 57 #define VIRTIO_F_NOTIFY_ON_EMPTY 24 58 59 /* Can the device handle any descriptor layout? */ 60 #define VIRTIO_F_ANY_LAYOUT 27 61 62 /* v1.0 compliant. */ 63 #define VIRTIO_F_VERSION_1 32 64 65 #define VIRTIO_F_ACCESS_PLATFORM 33 66 67 /* This feature indicates support for the packed virtqueue layout. */ 68 #define VIRTIO_F_RING_PACKED 34 69 70 // if this number is not equal to desc size, queue creation fails 71 #define SIZE_OF_SINGLE_INDIRECT_DESC 16 72 73 #endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */ 74