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 70