virtio.h

Go to the documentation of this file.

#ifndef _LINUX_VIRTIO_H
#define _LINUX_VIRTIO_H
/* Everything a virtio driver needs to work with any particular virtio
 * implementation. */
#include <linux/types.h>
#include <linux/scatterlist.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/gfp.h>

struct virtqueue {
    struct list_head list;
    void (*callback)(struct virtqueue *vq);
    const char *name;
    struct virtio_device *vdev;
    void *priv;
};

int virtqueue_add_buf(struct virtqueue *vq,
              struct scatterlist sg[],
              unsigned int out_num,
              unsigned int in_num,
              void *data,
              gfp_t gfp);

void virtqueue_kick(struct virtqueue *vq);

bool virtqueue_kick_prepare(struct virtqueue *vq);

void virtqueue_notify(struct virtqueue *vq);

void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);

void virtqueue_disable_cb(struct virtqueue *vq);

bool virtqueue_enable_cb(struct virtqueue *vq);

bool virtqueue_enable_cb_delayed(struct virtqueue *vq);

void *virtqueue_detach_unused_buf(struct virtqueue *vq);

unsigned int virtqueue_get_vring_size(struct virtqueue *vq);

int virtqueue_get_queue_index(struct virtqueue *vq);

struct virtio_device {
    int index;
    struct device dev;
    struct virtio_device_id id;
    struct virtio_config_ops *config;
    struct list_head vqs;
    /* Note that this is a Linux set_bit-style bitmap. */
    unsigned long features[1];
    void *priv;
};

#define dev_to_virtio(dev) container_of(dev, struct virtio_device, dev)
int register_virtio_device(struct virtio_device *dev);
void unregister_virtio_device(struct virtio_device *dev);

struct virtio_driver {
    struct device_driver driver;
    const struct virtio_device_id *id_table;
    const unsigned int *feature_table;
    unsigned int feature_table_size;
    int (*probe)(struct virtio_device *dev);
    void (*scan)(struct virtio_device *dev);
    void (*remove)(struct virtio_device *dev);
    void (*config_changed)(struct virtio_device *dev);
#ifdef CONFIG_PM
    int (*freeze)(struct virtio_device *dev);
    int (*restore)(struct virtio_device *dev);
#endif
};

int register_virtio_driver(struct virtio_driver *drv);
void unregister_virtio_driver(struct virtio_driver *drv);
#endif /* _LINUX_VIRTIO_H */