kernel/tools/virtio/linux/virtio.h

   1 #ifndef LINUX_VIRTIO_H
   2 #define LINUX_VIRTIO_H
   3 #include <linux/scatterlist.h>
   4 #include <linux/kernel.h>
   5
   6 struct virtio_device {
   7         void *dev;
   8         u64 features;
   9 };
  10
  11 struct virtqueue {
  12         /* TODO: commented as list macros are empty stubs for now.
  13          * Broken but enough for virtio_ring.c
  14          * struct list_head list; */
  15         void (*callback)(struct virtqueue *vq);
  16         const char *name;
  17         struct virtio_device *vdev;
  18         unsigned int index;
  19         unsigned int num_free;
  20         void *priv;
  21 };
  22
  23 /* Interfaces exported by virtio_ring. */
  24 int virtqueue_add_sgs(struct virtqueue *vq,
  25                       struct scatterlist *sgs[],
  26                       unsigned int out_sgs,
  27                       unsigned int in_sgs,
  28                       void *data,
  29                       gfp_t gfp);
  30
  31 int virtqueue_add_outbuf(struct virtqueue *vq,
  32                          struct scatterlist sg[], unsigned int num,
  33                          void *data,
  34                          gfp_t gfp);
  35
  36 int virtqueue_add_inbuf(struct virtqueue *vq,
  37                         struct scatterlist sg[], unsigned int num,
  38                         void *data,
  39                         gfp_t gfp);
  40
  41 bool virtqueue_kick(struct virtqueue *vq);
  42
  43 void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
  44
  45 void virtqueue_disable_cb(struct virtqueue *vq);
  46
  47 bool virtqueue_enable_cb(struct virtqueue *vq);
  48 bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
  49
  50 void *virtqueue_detach_unused_buf(struct virtqueue *vq);
  51 struct virtqueue *vring_new_virtqueue(unsigned int index,
  52                                       unsigned int num,
  53                                       unsigned int vring_align,
  54                                       struct virtio_device *vdev,
  55                                       bool weak_barriers,
  56                                       void *pages,
  57                                       bool (*notify)(struct virtqueue *vq),
  58                                       void (*callback)(struct virtqueue *vq),
  59                                       const char *name);
  60 void vring_del_virtqueue(struct virtqueue *vq);
  61
  62 #endif