2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #ifndef _VIRTIO_VIRTQUEUE_H
32 #define _VIRTIO_VIRTQUEUE_H
37 /* Device callback for a virtqueue interrupt. */
38 typedef void virtqueue_intr_t(void *);
41 * Hint on how long the next interrupt should be postponed. This is
42 * only used when the EVENT_IDX feature is negotiated.
47 VQ_POSTPONE_EMPTIED /* Until all available desc are used. */
50 #define VIRTQUEUE_MAX_NAME_SZ 32
52 /* One for each virtqueue the device wishes to allocate. */
53 struct vq_alloc_info {
54 char vqai_name[VIRTQUEUE_MAX_NAME_SZ];
56 virtqueue_intr_t *vqai_intr;
58 struct virtqueue **vqai_vq;
61 #define VQ_ALLOC_INFO_INIT(_i,_nsegs,_intr,_arg,_vqp,_str,...) do { \
62 snprintf((_i)->vqai_name, VIRTQUEUE_MAX_NAME_SZ, _str, \
64 (_i)->vqai_maxindirsz = (_nsegs); \
65 (_i)->vqai_intr = (_intr); \
66 (_i)->vqai_intr_arg = (_arg); \
67 (_i)->vqai_vq = (_vqp); \
70 uint64_t virtqueue_filter_features(uint64_t features);
72 int virtqueue_alloc(device_t dev, uint16_t queue, uint16_t size,
73 int align, vm_paddr_t highaddr, struct vq_alloc_info *info,
74 struct virtqueue **vqp);
75 void *virtqueue_drain(struct virtqueue *vq, int *last);
76 void virtqueue_free(struct virtqueue *vq);
77 int virtqueue_reinit(struct virtqueue *vq, uint16_t size);
79 int virtqueue_intr_filter(struct virtqueue *vq);
80 void virtqueue_intr(struct virtqueue *vq);
81 int virtqueue_enable_intr(struct virtqueue *vq);
82 int virtqueue_postpone_intr(struct virtqueue *vq, vq_postpone_t hint);
83 void virtqueue_disable_intr(struct virtqueue *vq);
85 /* Get physical address of the virtqueue ring. */
86 vm_paddr_t virtqueue_paddr(struct virtqueue *vq);
87 vm_paddr_t virtqueue_desc_paddr(struct virtqueue *vq);
88 vm_paddr_t virtqueue_avail_paddr(struct virtqueue *vq);
89 vm_paddr_t virtqueue_used_paddr(struct virtqueue *vq);
91 uint16_t virtqueue_index(struct virtqueue *vq);
92 int virtqueue_full(struct virtqueue *vq);
93 int virtqueue_empty(struct virtqueue *vq);
94 int virtqueue_size(struct virtqueue *vq);
95 int virtqueue_nfree(struct virtqueue *vq);
96 int virtqueue_nused(struct virtqueue *vq);
97 void virtqueue_notify(struct virtqueue *vq);
98 void virtqueue_dump(struct virtqueue *vq);
100 int virtqueue_enqueue(struct virtqueue *vq, void *cookie,
101 struct sglist *sg, int readable, int writable);
102 void *virtqueue_dequeue(struct virtqueue *vq, uint32_t *len);
103 void *virtqueue_poll(struct virtqueue *vq, uint32_t *len);
105 #endif /* _VIRTIO_VIRTQUEUE_H */