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virtio: add virtio_queue_get_id

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Serializing virtio-scsi requests needs a simple way to get from a
VirtQueue to the number of the queue.  The virtio_queue_get_id
provides this.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-04-06 10:38:37 +02:00
parent fcf104a74c
commit c80decdbd9
2 changed files with 8 additions and 0 deletions
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7
hw/virtio.c
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@ -624,6 +624,13 @@ int virtio_queue_get_num(VirtIODevice *vdev, int n)
return vdev->vq[n].vring.num; return vdev->vq[n].vring.num;
} }
int virtio_queue_get_id(VirtQueue *vq)
{
VirtIODevice *vdev = vq->vdev;
assert(vq >= &vdev->vq[0] && vq < &vdev->vq[VIRTIO_PCI_QUEUE_MAX]);
return vq - &vdev->vq[0];
}
void virtio_queue_notify_vq(VirtQueue *vq) void virtio_queue_notify_vq(VirtQueue *vq)
{ {
if (vq->vring.desc) { if (vq->vring.desc) {

1
hw/virtio.h
View File

@ -229,6 +229,7 @@ target_phys_addr_t virtio_queue_get_ring_size(VirtIODevice *vdev, int n);
uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n); uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx); void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx);
VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n); VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
int virtio_queue_get_id(VirtQueue *vq);
EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq); EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);
EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq); EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
void virtio_queue_notify_vq(VirtQueue *vq); void virtio_queue_notify_vq(VirtQueue *vq);