139d6af07SAsias He #ifndef KVM__VIRTIO_H 239d6af07SAsias He #define KVM__VIRTIO_H 339d6af07SAsias He 439d6af07SAsias He #include <linux/virtio_ring.h> 539d6af07SAsias He 6*3fdf659dSSasha Levin #include <linux/types.h> 739d6af07SAsias He #include <sys/uio.h> 839d6af07SAsias He 939d6af07SAsias He #include "kvm/kvm.h" 1039d6af07SAsias He 1139d6af07SAsias He struct virt_queue { 1239d6af07SAsias He struct vring vring; 13*3fdf659dSSasha Levin u32 pfn; 1439d6af07SAsias He /* The last_avail_idx field is an index to ->ring of struct vring_avail. 1539d6af07SAsias He It's where we assume the next request index is at. */ 16*3fdf659dSSasha Levin u16 last_avail_idx; 1739d6af07SAsias He }; 1839d6af07SAsias He 19*3fdf659dSSasha Levin static inline u16 virt_queue__pop(struct virt_queue *queue) 2039d6af07SAsias He { 2139d6af07SAsias He return queue->vring.avail->ring[queue->last_avail_idx++ % queue->vring.num]; 2239d6af07SAsias He } 2339d6af07SAsias He 24*3fdf659dSSasha Levin static inline struct vring_desc *virt_queue__get_desc(struct virt_queue *queue, u16 desc_ndx) 2539d6af07SAsias He { 2639d6af07SAsias He return &queue->vring.desc[desc_ndx]; 2739d6af07SAsias He } 2839d6af07SAsias He 2939d6af07SAsias He static inline bool virt_queue__available(struct virt_queue *vq) 3039d6af07SAsias He { 31412aa73fSAmos Kong if (!vq->vring.avail) 32412aa73fSAmos Kong return 0; 3339d6af07SAsias He return vq->vring.avail->idx != vq->last_avail_idx; 3439d6af07SAsias He } 3539d6af07SAsias He 36*3fdf659dSSasha Levin struct vring_used_elem *virt_queue__set_used_elem(struct virt_queue *queue, u32 head, u32 len); 3739d6af07SAsias He 38*3fdf659dSSasha Levin u16 virt_queue__get_iov(struct virt_queue *queue, struct iovec iov[], u16 *out, u16 *in, struct kvm *kvm); 3939d6af07SAsias He 4039d6af07SAsias He #endif /* KVM__VIRTIO_H */ 41