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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-02-25 GuEe-GUI the first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "virtio.dev.9p"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include <dfs_9pfs.h>
#include "virtio_config/virtio-9p.h"
struct virtio_9p
{
struct p9_protocol parent;
struct rt_virtio_device *vdev;
char *tag;
struct rt_virtqueue *vqs[1];
struct rt_completion done;
struct rt_spinlock lock;
};
static rt_err_t virtio_9p_transport(struct p9_protocol *p9p,
rt_uint8_t *tx_data, rt_uint32_t tx_size,
rt_uint8_t *rx_data, rt_uint32_t *ref_rx_size)
{
rt_err_t err;
rt_ubase_t level;
struct rt_virtqueue *vq;
struct virtio_9p *v9p = rt_container_of(p9p, struct virtio_9p, parent);
vq = v9p->vqs[0];
rt_virtqueue_wait_prepare(vq, 2);
level = rt_spin_lock_irqsave(&v9p->lock);
rt_virtqueue_add_outbuf(vq, tx_data, tx_size);
rt_virtqueue_add_inbuf(vq, rx_data, *ref_rx_size);
rt_virtqueue_kick(vq);
rt_spin_unlock_irqrestore(&v9p->lock, level);
if (!(err = rt_completion_wait(&v9p->done, rt_tick_from_millisecond(1000))))
{
*ref_rx_size = rt_min_t(rt_uint32_t,
*ref_rx_size, rt_le32_to_cpu(*(rt_uint32_t*)(&rx_data[0])));
}
return err;
}
static void virtio_9p_done(struct rt_virtqueue *vq)
{
rt_ubase_t level;
struct virtio_9p *v9p = vq->vdev->priv;
level = rt_spin_lock_irqsave(&v9p->lock);
rt_virtqueue_read_buf(vq, RT_NULL);
rt_completion_done(&v9p->done);
rt_spin_unlock_irqrestore(&v9p->lock, level);
}
static rt_err_t virtio_9p_vq_init(struct virtio_9p *v9p)
{
const char *names[] =
{
"req",
};
rt_virtqueue_callback cbs[] =
{
&virtio_9p_done,
};
return rt_virtio_virtqueue_install(v9p->vdev, RT_ARRAY_SIZE(v9p->vqs),
v9p->vqs, names, cbs);
}
static void virtio_9p_vq_finit(struct virtio_9p *v9p)
{
if (v9p->vqs[0])
{
rt_virtio_virtqueue_release(v9p->vdev);
}
if (v9p->tag)
{
rt_free(v9p->tag);
}
rt_free(v9p);
}
static rt_err_t virtio_9p_probe(struct rt_virtio_device *vdev)
{
rt_err_t err;
rt_uint16_t tag_len = 0;
struct virtio_9p *v9p = rt_calloc(1, sizeof(*v9p));
if (!v9p)
{
return -RT_ENOMEM;
}
vdev->priv = v9p;
v9p->vdev = vdev;
vdev->parent.user_data = v9p;
if ((err = virtio_9p_vq_init(v9p)))
{
goto _fail;
}
if (rt_virtio_has_feature(vdev, VIRTIO_9P_F_MOUNT_TAG))
{
rt_virtio_read_config(vdev, struct virtio_9p_config, tag_len, &tag_len);
}
v9p->tag = rt_malloc(tag_len + 1);
if (!v9p->tag)
{
err = -RT_EINVAL;
goto _fail;
}
rt_virtio_read_bytes(vdev, rt_offsetof(struct virtio_9p_config, tag),
v9p->tag, 1, tag_len);
v9p->tag[tag_len] = '\0';
rt_completion_init(&v9p->done);
rt_spin_lock_init(&v9p->lock);
v9p->parent.name = "virtio";
v9p->parent.tag = v9p->tag;
v9p->parent.transport = &virtio_9p_transport;
if ((err = dfs_9pfs_add_tag(&v9p->parent)))
{
goto _fail;
}
return RT_EOK;
_fail:
virtio_9p_vq_finit(v9p);
return err;
}
static rt_err_t virtio_9p_remove(struct rt_virtio_device *vdev)
{
struct virtio_9p *v9p = vdev->parent.user_data;
dfs_9pfs_del_tag(&v9p->parent);
virtio_9p_vq_finit(v9p);
return RT_EOK;
}
static const struct rt_virtio_device_id virtio_9p_ids[] =
{
{ VIRTIO_DEVICE_ID_9P, VIRTIO_DEVICE_ANY_ID },
{ /* sentinel */ }
};
static struct rt_virtio_driver virtio_9p_driver =
{
.ids = virtio_9p_ids,
.features =
RT_BIT(VIRTIO_9P_F_MOUNT_TAG)
| RT_BIT(VIRTIO_F_ANY_LAYOUT),
.probe = virtio_9p_probe,
.remove = virtio_9p_remove,
};
RT_VIRTIO_DRIVER_EXPORT(virtio_9p_driver);
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