tools/virtio/linux/virtio.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef LINUX_VIRTIO_H
   3 #define LINUX_VIRTIO_H
   4 #include <linux/scatterlist.h>
   5 #include <linux/kernel.h>
   6 #include <linux/spinlock.h>
   7
   8 struct device {
   9         void *parent;
  10 };
  11
  12 struct virtio_device {
  13         struct device dev;
  14         u64 features;
  15         struct list_head vqs;
  16         spinlock_t vqs_list_lock;
  17         const struct virtio_config_ops *config;
  18 };
  19
  20 struct virtqueue {
  21         struct list_head list;
  22         void (*callback)(struct virtqueue *vq);
  23         const char *name;
  24         struct virtio_device *vdev;
  25         unsigned int index;
  26         unsigned int num_free;
  27         unsigned int num_max;
  28         void *priv;
  29         bool reset;
  30 };
  31
  32 /* Interfaces exported by virtio_ring. */
  33 int virtqueue_add_sgs(struct virtqueue *vq,
  34                       struct scatterlist *sgs[],
  35                       unsigned int out_sgs,
  36                       unsigned int in_sgs,
  37                       void *data,
  38                       gfp_t gfp);
  39
  40 int virtqueue_add_outbuf(struct virtqueue *vq,
  41                          struct scatterlist sg[], unsigned int num,
  42                          void *data,
  43                          gfp_t gfp);
  44
  45 int virtqueue_add_inbuf(struct virtqueue *vq,
  46                         struct scatterlist sg[], unsigned int num,
  47                         void *data,
  48                         gfp_t gfp);
  49
  50 bool virtqueue_kick(struct virtqueue *vq);
  51
  52 void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
  53
  54 void virtqueue_disable_cb(struct virtqueue *vq);
  55
  56 bool virtqueue_enable_cb(struct virtqueue *vq);
  57 bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
  58
  59 void *virtqueue_detach_unused_buf(struct virtqueue *vq);
  60 struct virtqueue *vring_new_virtqueue(unsigned int index,
  61                                       unsigned int num,
  62                                       unsigned int vring_align,
  63                                       struct virtio_device *vdev,
  64                                       bool weak_barriers,
  65                                       bool ctx,
  66                                       void *pages,
  67                                       bool (*notify)(struct virtqueue *vq),
  68                                       void (*callback)(struct virtqueue *vq),
  69                                       const char *name);
  70 void vring_del_virtqueue(struct virtqueue *vq);
  71
  72 #endif