vhost.h | Explore in Territory

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _VHOST_H
#define _VHOST_H

#include <linux/eventfd.h>
#include <linux/vhost.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/file.h>
#include <linux/uio.h>
#include <linux/virtio_config.h>
#include <linux/virtio_ring.h>
#include <linux/atomic.h>
#include <linux/vhost_iotlb.h>
#include <linux/irqbypass.h>

struct vhost_work;
struct vhost_task;
vhost_work_fn_t;

#define VHOST_WORK_QUEUED …
struct vhost_work { … };

struct vhost_worker { … };

/* Poll a file (eventfd or socket) */
/* Note: there's nothing vhost specific about this structure. */
struct vhost_poll { … };

void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
		     __poll_t mask, struct vhost_dev *dev,
		     struct vhost_virtqueue *vq);
int vhost_poll_start(struct vhost_poll *poll, struct file *file);
void vhost_poll_stop(struct vhost_poll *poll);
void vhost_poll_queue(struct vhost_poll *poll);

void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn);
void vhost_dev_flush(struct vhost_dev *dev);

struct vhost_log { … };

enum vhost_uaddr_type { … };

struct vhost_vring_call { … };

/* The virtqueue structure describes a queue attached to a device. */
struct vhost_virtqueue { … };

struct vhost_msg_node { … };

struct vhost_dev { … };

bool vhost_exceeds_weight(struct vhost_virtqueue *vq, int pkts, int total_len);
void vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue **vqs,
		    int nvqs, int iov_limit, int weight, int byte_weight,
		    bool use_worker,
		    int (*msg_handler)(struct vhost_dev *dev, u32 asid,
				       struct vhost_iotlb_msg *msg));
long vhost_dev_set_owner(struct vhost_dev *dev);
bool vhost_dev_has_owner(struct vhost_dev *dev);
long vhost_dev_check_owner(struct vhost_dev *);
struct vhost_iotlb *vhost_dev_reset_owner_prepare(void);
void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_iotlb *iotlb);
void vhost_dev_cleanup(struct vhost_dev *);
void vhost_dev_stop(struct vhost_dev *);
long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, void __user *argp);
long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp);
long vhost_worker_ioctl(struct vhost_dev *dev, unsigned int ioctl,
			void __user *argp);
bool vhost_vq_access_ok(struct vhost_virtqueue *vq);
bool vhost_log_access_ok(struct vhost_dev *);
void vhost_clear_msg(struct vhost_dev *dev);

int vhost_get_vq_desc(struct vhost_virtqueue *,
		      struct iovec iov[], unsigned int iov_size,
		      unsigned int *out_num, unsigned int *in_num,
		      struct vhost_log *log, unsigned int *log_num);
void vhost_discard_vq_desc(struct vhost_virtqueue *, int n);

bool vhost_vq_work_queue(struct vhost_virtqueue *vq, struct vhost_work *work);
bool vhost_vq_has_work(struct vhost_virtqueue *vq);
bool vhost_vq_is_setup(struct vhost_virtqueue *vq);
int vhost_vq_init_access(struct vhost_virtqueue *);
int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len);
int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads,
		     unsigned count);
void vhost_add_used_and_signal(struct vhost_dev *, struct vhost_virtqueue *,
			       unsigned int id, int len);
void vhost_add_used_and_signal_n(struct vhost_dev *, struct vhost_virtqueue *,
			       struct vring_used_elem *heads, unsigned count);
void vhost_signal(struct vhost_dev *, struct vhost_virtqueue *);
void vhost_disable_notify(struct vhost_dev *, struct vhost_virtqueue *);
bool vhost_vq_avail_empty(struct vhost_dev *, struct vhost_virtqueue *);
bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *);

int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log,
		    unsigned int log_num, u64 len,
		    struct iovec *iov, int count);
int vq_meta_prefetch(struct vhost_virtqueue *vq);

struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type);
void vhost_enqueue_msg(struct vhost_dev *dev,
		       struct list_head *head,
		       struct vhost_msg_node *node);
struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev,
					 struct list_head *head);
void vhost_set_backend_features(struct vhost_dev *dev, u64 features);

__poll_t vhost_chr_poll(struct file *file, struct vhost_dev *dev,
			    poll_table *wait);
ssize_t vhost_chr_read_iter(struct vhost_dev *dev, struct iov_iter *to,
			    int noblock);
ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
			     struct iov_iter *from);
int vhost_init_device_iotlb(struct vhost_dev *d);

void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
			  struct vhost_iotlb_map *map);

#define vq_err(vq, fmt, ...) …

enum { … };

/**
 * vhost_vq_set_backend - Set backend.
 *
 * @vq            Virtqueue.
 * @private_data  The private data.
 *
 * Context: Need to call with vq->mutex acquired.
 */
static inline void vhost_vq_set_backend(struct vhost_virtqueue *vq,
					void *private_data)
{ … }

/**
 * vhost_vq_get_backend - Get backend.
 *
 * @vq            Virtqueue.
 *
 * Context: Need to call with vq->mutex acquired.
 * Return: Private data previously set with vhost_vq_set_backend.
 */
static inline void *vhost_vq_get_backend(struct vhost_virtqueue *vq)
{ … }

static inline bool vhost_has_feature(struct vhost_virtqueue *vq, int bit)
{ … }

static inline bool vhost_backend_has_feature(struct vhost_virtqueue *vq, int bit)
{ … }

#ifdef CONFIG_VHOST_CROSS_ENDIAN_LEGACY
static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
{ … }
#else
static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
{
	return virtio_legacy_is_little_endian() || vq->is_le;
}
#endif

/* Memory accessors */
static inline u16 vhost16_to_cpu(struct vhost_virtqueue *vq, __virtio16 val)
{ … }

static inline __virtio16 cpu_to_vhost16(struct vhost_virtqueue *vq, u16 val)
{ … }

static inline u32 vhost32_to_cpu(struct vhost_virtqueue *vq, __virtio32 val)
{ … }

static inline __virtio32 cpu_to_vhost32(struct vhost_virtqueue *vq, u32 val)
{ … }

static inline u64 vhost64_to_cpu(struct vhost_virtqueue *vq, __virtio64 val)
{ … }

static inline __virtio64 cpu_to_vhost64(struct vhost_virtqueue *vq, u64 val)
{ … }
#endif
linux/drivers/vhost/vhost.h
