1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 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. 16 * 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. 27 */ 28 29 #ifndef _VIRTIO_VIRTQUEUE_H 30 #define _VIRTIO_VIRTQUEUE_H 31 32 struct virtqueue; 33 struct sglist; 34 35 /* Device callback for a virtqueue interrupt. */ 36 typedef void virtqueue_intr_t(void *); 37 38 /* 39 * Hint on how long the next interrupt should be postponed. This is 40 * only used when the EVENT_IDX feature is negotiated. 41 */ 42 typedef enum { 43 VQ_POSTPONE_SHORT, 44 VQ_POSTPONE_LONG, 45 VQ_POSTPONE_EMPTIED /* Until all available desc are used. */ 46 } vq_postpone_t; 47 48 #define VIRTQUEUE_MAX_NAME_SZ 32 49 50 /* One for each virtqueue the device wishes to allocate. */ 51 struct 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 68 int virtqueue_alloc(device_t dev, uint16_t queue, uint16_t size, 69 bus_size_t notify_offset, int align, vm_paddr_t highaddr, 70 struct vq_alloc_info *info, struct virtqueue **vqp); 71 void *virtqueue_drain(struct virtqueue *vq, int *last); 72 void virtqueue_free(struct virtqueue *vq); 73 int virtqueue_reinit(struct virtqueue *vq, uint16_t size); 74 75 int virtqueue_intr_filter(struct virtqueue *vq); 76 void virtqueue_intr(struct virtqueue *vq); 77 int virtqueue_enable_intr(struct virtqueue *vq); 78 int virtqueue_postpone_intr(struct virtqueue *vq, vq_postpone_t hint); 79 void virtqueue_disable_intr(struct virtqueue *vq); 80 81 /* Get physical address of the virtqueue ring. */ 82 vm_paddr_t virtqueue_paddr(struct virtqueue *vq); 83 vm_paddr_t virtqueue_desc_paddr(struct virtqueue *vq); 84 vm_paddr_t virtqueue_avail_paddr(struct virtqueue *vq); 85 vm_paddr_t virtqueue_used_paddr(struct virtqueue *vq); 86 87 uint16_t virtqueue_index(struct virtqueue *vq); 88 int virtqueue_full(struct virtqueue *vq); 89 int virtqueue_empty(struct virtqueue *vq); 90 int virtqueue_size(struct virtqueue *vq); 91 int virtqueue_nfree(struct virtqueue *vq); 92 int virtqueue_nused(struct virtqueue *vq); 93 void virtqueue_notify(struct virtqueue *vq); 94 void virtqueue_dump(struct virtqueue *vq); 95 96 int virtqueue_enqueue(struct virtqueue *vq, void *cookie, 97 struct sglist *sg, int readable, int writable); 98 void *virtqueue_dequeue(struct virtqueue *vq, uint32_t *len); 99 void *virtqueue_poll(struct virtqueue *vq, uint32_t *len); 100 101 #endif /* _VIRTIO_VIRTQUEUE_H */ 102