virtqueue.h revision 238072
1/*- 2 * Copyright (c) 2011, Bryan Venteicher <bryanv@daemoninthecloset.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * 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 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD: head/sys/dev/virtio/virtqueue.h 238072 2012-07-03 15:15:41Z obrien $ 27 */ 28 29#ifndef _VIRTIO_VIRTQUEUE_H 30#define _VIRTIO_VIRTQUEUE_H 31 32struct virtqueue; 33struct sglist; 34 35/* Support for indirect buffer descriptors. */ 36#define VIRTIO_RING_F_INDIRECT_DESC (1 << 28) 37 38/* The guest publishes the used index for which it expects an interrupt 39 * at the end of the avail ring. Host should ignore the avail->flags field. 40 * The host publishes the avail index for which it expects a kick 41 * at the end of the used ring. Guest should ignore the used->flags field. 42 */ 43#define VIRTIO_RING_F_EVENT_IDX (1 << 29) 44 45/* Device callback for a virtqueue interrupt. */ 46typedef int virtqueue_intr_t(void *); 47 48#define VIRTQUEUE_MAX_NAME_SZ 32 49 50/* One for each virtqueue the device wishes to allocate. */ 51struct vq_alloc_info { 52 char vqai_name[VIRTQUEUE_MAX_NAME_SZ]; 53 int vqai_maxindirsz; 54 virtqueue_intr_t *vqai_intr; 55 void *vqai_intr_arg; 56 struct virtqueue **vqai_vq; 57}; 58 59#define VQ_ALLOC_INFO_INIT(_i,_nsegs,_intr,_arg,_vqp,_str,...) do { \ 60 snprintf((_i)->vqai_name, VIRTQUEUE_MAX_NAME_SZ, _str, \ 61 ##__VA_ARGS__); \ 62 (_i)->vqai_maxindirsz = (_nsegs); \ 63 (_i)->vqai_intr = (_intr); \ 64 (_i)->vqai_intr_arg = (_arg); \ 65 (_i)->vqai_vq = (_vqp); \ 66} while (0) 67 68uint64_t virtqueue_filter_features(uint64_t features); 69 70int virtqueue_alloc(device_t dev, uint16_t queue, uint16_t size, 71 int align, vm_paddr_t highaddr, struct vq_alloc_info *info, 72 struct virtqueue **vqp); 73void *virtqueue_drain(struct virtqueue *vq, int *last); 74void virtqueue_free(struct virtqueue *vq); 75int virtqueue_reinit(struct virtqueue *vq, uint16_t size); 76 77int virtqueue_intr(struct virtqueue *vq); 78int virtqueue_enable_intr(struct virtqueue *vq); 79int virtqueue_postpone_intr(struct virtqueue *vq); 80void virtqueue_disable_intr(struct virtqueue *vq); 81 82/* Get physical address of the virtqueue ring. */ 83vm_paddr_t virtqueue_paddr(struct virtqueue *vq); 84 85int virtqueue_full(struct virtqueue *vq); 86int virtqueue_empty(struct virtqueue *vq); 87int virtqueue_size(struct virtqueue *vq); 88int virtqueue_nused(struct virtqueue *vq); 89void virtqueue_notify(struct virtqueue *vq); 90void virtqueue_dump(struct virtqueue *vq); 91 92int virtqueue_enqueue(struct virtqueue *vq, void *cookie, 93 struct sglist *sg, int readable, int writable); 94void *virtqueue_dequeue(struct virtqueue *vq, uint32_t *len); 95void *virtqueue_poll(struct virtqueue *vq, uint32_t *len); 96 97#endif /* _VIRTIO_VIRTQUEUE_H */ 98