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 };
  18
  19 struct virtqueue {
  20         struct list_head list;
  21         void (*callback)(struct virtqueue *vq);
  22         const char *name;
  23         struct virtio_device *vdev;
  24         unsigned int index;
  25         unsigned int num_free;
  26         void *priv;
  27 };
  28
  29 /* Interfaces exported by virtio_ring. */
  30 int virtqueue_add_sgs(struct virtqueue *vq,
  31                       struct scatterlist *sgs[],
  32                       unsigned int out_sgs,
  33                       unsigned int in_sgs,
  34                       void *data,
  35                       gfp_t gfp);
  36
  37 int virtqueue_add_outbuf(struct virtqueue *vq,
  38                          struct scatterlist sg[], unsigned int num,
  39                          void *data,
  40                          gfp_t gfp);
  41
  42 int virtqueue_add_inbuf(struct virtqueue *vq,
  43                         struct scatterlist sg[], unsigned int num,
  44                         void *data,
  45                         gfp_t gfp);
  46
  47 bool virtqueue_kick(struct virtqueue *vq);
  48
  49 void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
  50
  51 void virtqueue_disable_cb(struct virtqueue *vq);
  52
  53 bool virtqueue_enable_cb(struct virtqueue *vq);
  54 bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
  55
  56 void *virtqueue_detach_unused_buf(struct virtqueue *vq);
  57 struct virtqueue *vring_new_virtqueue(unsigned int index,
  58                                       unsigned int num,
  59                                       unsigned int vring_align,
  60                                       struct virtio_device *vdev,
  61                                       bool weak_barriers,
  62                                       bool ctx,
  63                                       void *pages,
  64                                       bool (*notify)(struct virtqueue *vq),
  65                                       void (*callback)(struct virtqueue *vq),
  66                                       const char *name);
  67 void vring_del_virtqueue(struct virtqueue *vq);
  68
  69 #endif