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/* $OpenBSD: virtiovar.h,v 1.21 2024/08/27 19:01:11 sf Exp $ */
/* $NetBSD: virtiovar.h,v 1.1 2011/10/30 12:12:21 hannken Exp $ */
/*
* Copyright (c) 2012 Stefan Fritsch.
* Copyright (c) 2010 Minoura Makoto.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Part of the file derived from `Virtio PCI Card Specification v0.8.6 DRAFT'
* Appendix A.
*/
/* An interface for efficient virtio implementation.
*
* This header is BSD licensed so anyone can use the definitions
* to implement compatible drivers/servers.
*
* Copyright 2007, 2009, IBM Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _DEV_PV_VIRTIOVAR_H_
#define _DEV_PV_VIRTIOVAR_H_
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/device.h>
#include <sys/mutex.h>
#include <machine/bus.h>
#include <dev/pv/virtioreg.h>
#ifndef VIRTIO_DEBUG
#define VIRTIO_DEBUG 0
#endif
/* flags for config(8) */
#define VIRTIO_CF_NO_INDIRECT 1
#define VIRTIO_CF_NO_EVENT_IDX 2
#define VIRTIO_CF_PREFER_VERSION_1 4
#define VIRTIO_CF_NO_VERSION_1 8
struct virtio_attach_args {
int va_devid; /* virtio device id */
unsigned int va_nintr; /* number of intr vectors */
};
struct vq_entry {
SLIST_ENTRY(vq_entry) qe_list; /* free list */
uint16_t qe_index; /* index in vq_desc array */
/* The following are used only in the `head' entry */
int16_t qe_next; /* next enq slot */
int16_t qe_indirect; /* 1 if using indirect */
int16_t qe_vr_index; /* index in sc_reqs array */
struct vring_desc *qe_desc_base; /* pointer to vd array */
};
struct virtqueue {
struct virtio_softc *vq_owner;
unsigned int vq_num; /* queue size (# of entries) */
unsigned int vq_mask; /* (1 << vq_num - 1) */
int vq_index; /* queue number (0, 1, ...) */
/* vring pointers (KVA) */
struct vring_desc *vq_desc;
struct vring_avail *vq_avail;
struct vring_used *vq_used;
void *vq_indirect;
/* virtqueue allocation info */
void *vq_vaddr;
int vq_availoffset;
int vq_usedoffset;
int vq_indirectoffset;
bus_dma_segment_t vq_segs[1];
unsigned int vq_bytesize;
bus_dmamap_t vq_dmamap;
int vq_maxnsegs;
/* free entry management */
struct vq_entry *vq_entries;
SLIST_HEAD(, vq_entry) vq_freelist;
/* enqueue/dequeue status */
uint16_t vq_avail_idx;
uint16_t vq_used_idx;
int vq_queued;
/* interrupt handler */
int (*vq_done)(struct virtqueue*);
/* 1.x only: offset for notify address calculation */
uint32_t vq_notify_off;
};
struct virtio_feature_name {
uint64_t bit;
const char *name;
};
struct virtio_ops {
void (*kick)(struct virtio_softc *, uint16_t);
uint8_t (*read_dev_cfg_1)(struct virtio_softc *, int);
uint16_t (*read_dev_cfg_2)(struct virtio_softc *, int);
uint32_t (*read_dev_cfg_4)(struct virtio_softc *, int);
uint64_t (*read_dev_cfg_8)(struct virtio_softc *, int);
void (*write_dev_cfg_1)(struct virtio_softc *, int, uint8_t);
void (*write_dev_cfg_2)(struct virtio_softc *, int, uint16_t);
void (*write_dev_cfg_4)(struct virtio_softc *, int, uint32_t);
void (*write_dev_cfg_8)(struct virtio_softc *, int, uint64_t);
uint16_t (*read_queue_size)(struct virtio_softc *, uint16_t);
void (*setup_queue)(struct virtio_softc *, struct virtqueue *, uint64_t);
int (*get_status)(struct virtio_softc *);
void (*set_status)(struct virtio_softc *, int);
int (*neg_features)(struct virtio_softc *, const struct virtio_feature_name *);
int (*poll_intr)(void *);
};
#define VIRTIO_CHILD_ERROR ((void*)1)
struct virtio_softc {
struct device sc_dev;
bus_dma_tag_t sc_dmat; /* set by transport */
const struct virtio_ops *sc_ops; /* set by transport */
int sc_ipl; /* set by child */
uint64_t sc_driver_features;
uint64_t sc_active_features;
int sc_indirect;
int sc_version_1;
int sc_nvqs; /* set by child */
struct virtqueue *sc_vqs; /* set by child */
struct device *sc_child; /* set by child,
* VIRTIO_CHILD_ERROR on error
*/
int (*sc_config_change)(struct virtio_softc*);
/* set by child */
};
/* public interface */
#define virtio_read_device_config_1(sc, o) (sc)->sc_ops->read_dev_cfg_1(sc, o)
#define virtio_read_device_config_2(sc, o) (sc)->sc_ops->read_dev_cfg_2(sc, o)
#define virtio_read_device_config_4(sc, o) (sc)->sc_ops->read_dev_cfg_4(sc, o)
#define virtio_read_device_config_8(sc, o) (sc)->sc_ops->read_dev_cfg_8(sc, o)
#define virtio_write_device_config_1(sc, o, v) (sc)->sc_ops->write_dev_cfg_1(sc, o, v)
#define virtio_write_device_config_2(sc, o, v) (sc)->sc_ops->write_dev_cfg_2(sc, o, v)
#define virtio_write_device_config_4(sc, o, v) (sc)->sc_ops->write_dev_cfg_4(sc, o, v)
#define virtio_write_device_config_8(sc, o, v) (sc)->sc_ops->write_dev_cfg_8(sc, o, v)
#define virtio_read_queue_size(sc, i) (sc)->sc_ops->read_queue_size(sc, i)
#define virtio_setup_queue(sc, i, v) (sc)->sc_ops->setup_queue(sc, i, v)
#define virtio_negotiate_features(sc, n) (sc)->sc_ops->neg_features(sc, n)
#define virtio_poll_intr(sc) (sc)->sc_ops->poll_intr(sc)
#define virtio_get_status(sc) (sc)->sc_ops->get_status(sc)
#define virtio_set_status(sc, i) (sc)->sc_ops->set_status(sc, i)
/* only for transport drivers */
#define virtio_device_reset(sc) virtio_set_status((sc), 0)
static inline int
virtio_has_feature(struct virtio_softc *sc, uint64_t fbit)
{
if (sc->sc_active_features & fbit)
return 1;
return 0;
}
int virtio_alloc_vq(struct virtio_softc*, struct virtqueue*, int, int,
const char*);
int virtio_free_vq(struct virtio_softc*, struct virtqueue*);
void virtio_reset(struct virtio_softc *);
void virtio_reinit_start(struct virtio_softc *);
void virtio_reinit_end(struct virtio_softc *);
int virtio_enqueue_prep(struct virtqueue*, int*);
int virtio_enqueue_reserve(struct virtqueue*, int, int);
int virtio_enqueue(struct virtqueue*, int, bus_dmamap_t, int);
int virtio_enqueue_p(struct virtqueue*, int, bus_dmamap_t, bus_addr_t,
bus_size_t, int);
void virtio_enqueue_commit(struct virtio_softc*, struct virtqueue*, int, int);
#define virtio_notify(sc,vq) virtio_enqueue_commit(sc, vq, -1, 1)
int virtio_enqueue_abort(struct virtqueue*, int);
void virtio_enqueue_trim(struct virtqueue*, int, int);
int virtio_dequeue(struct virtio_softc*, struct virtqueue*, int *, int *);
int virtio_dequeue_commit(struct virtqueue*, int);
int virtio_check_vqs(struct virtio_softc *);
int virtio_check_vq(struct virtio_softc *, struct virtqueue *);
void virtio_stop_vq_intr(struct virtio_softc *, struct virtqueue *);
int virtio_start_vq_intr(struct virtio_softc *, struct virtqueue *);
const char *virtio_device_string(int);
#if VIRTIO_DEBUG
void virtio_log_features(uint64_t, uint64_t, const struct virtio_feature_name *);
void virtio_vq_dump(struct virtqueue *vq);
#endif
int virtio_nused(struct virtqueue *vq);
int virtio_postpone_intr(struct virtqueue *vq, uint16_t nslots);
int virtio_postpone_intr_smart(struct virtqueue *vq);
int virtio_postpone_intr_far(struct virtqueue *vq);
#endif /* _DEV_PV_VIRTIOVAR_H_ */
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