C++ (Cpp) vring_avail_event Examples

Example #1

File: vring.c Project: JMR-b/qemu

/* Enable guest->host notifies
 *
 * Return true if the vring is empty, false if there are more requests.
 */
bool vring_enable_notification(VirtIODevice *vdev, Vring *vring)
{
    if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
        vring_avail_event(&vring->vr) = vring->vr.avail->idx;
    } else {
        vring_clear_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY);
    }
    smp_mb(); /* ensure update is seen before reading avail_idx */
    return !vring_more_avail(vdev, vring);
}

Example #2

File: vring.c Project: Acidburn0zzz/qemu

/* Enable guest->host notifies
 *
 * Return true if the vring is empty, false if there are more requests.
 */
bool vring_enable_notification(VirtIODevice *vdev, Vring *vring)
{
    if (vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) {
        vring_avail_event(&vring->vr) = vring->vr.avail->idx;
    } else {
        vring->vr.used->flags &= ~VRING_USED_F_NO_NOTIFY;
    }
    smp_mb(); /* ensure update is seen before reading avail_idx */
    return !vring_more_avail(vring);
}

Example #3

File: virtio_queue.c Project: Florentah/xvisor-next

bool virtio_queue_available(struct virtio_queue *vq)
{
	if (!vq->addr || !vq->vring.avail) {
		return FALSE;
	}

	vring_avail_event(&vq->vring) = vq->last_avail_idx;

	return vq->vring.avail->idx !=  vq->last_avail_idx;
}

Example #4

File: virtio.c Project: dsqmoore/qemu-1

void virtio_queue_set_notification(VirtQueue *vq, int enable)
{
    vq->notification = enable;
    if (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) {
        vring_avail_event(vq, vring_avail_idx(vq));
    } else if (enable) {
        vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
    } else {
        vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY);
    }
}

Example #5

File: Hardware.c Project: asadpanda/kvm-guest-drivers-windows

void virtio_queue_set_notification(VirtQueue *vq, int enable)
{
    vq->notification = enable;
    if (bUsePublishedIndices) {
        vring_avail_event(vq, vring_avail_idx(vq));
    } else if (enable) {
        vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
    } else {
        vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY);
    }
}

Example #6

File: virtio_ring_0_9.c Project: 020gzh/linux

void kick_available(void)
{
	/* Flush in previous flags write */
	/* Barrier C (for pairing) */
	smp_mb();
	if (!vring_need_event(vring_avail_event(&ring),
			      guest.avail_idx,
			      guest.kicked_avail_idx))
		return;

	guest.kicked_avail_idx = guest.avail_idx;
	kick();
}

Example #7

File: virtqueue.c Project: BadrElh/open-amp

/**
 *
 * vq_ring_must_notify_host
 *
 */
static int vq_ring_must_notify_host(struct virtqueue *vq)
{
	uint16_t new_idx, prev_idx, event_idx;

	if (vq->vq_flags & VIRTQUEUE_FLAG_EVENT_IDX) {
		new_idx = vq->vq_ring.avail->idx;
		prev_idx = new_idx - vq->vq_queued_cnt;
		event_idx = vring_avail_event(&vq->vq_ring);

		return (vring_need_event(event_idx, new_idx, prev_idx) != 0);
	}

	return ((vq->vq_ring.used->flags & VRING_USED_F_NO_NOTIFY) == 0);
}

Example #8

File: virtio.c Project: chonghw/pemu

void virtio_queue_set_notification(VirtQueue *vq, int enable)
{
    vq->notification = enable;
    if (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) {
        vring_avail_event(vq, vring_avail_idx(vq));
    } else if (enable) {
        vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
    } else {
        vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY);
    }
    if (enable) {
        /* Expose avail event/used flags before caller checks the avail idx. */
        smp_mb();
    }
}

Example #9

File: virtio_ring_0_9.c Project: 020gzh/linux

bool enable_kick()
{
	unsigned head = host.used_idx;

	vring_avail_event(&ring) = head;
	/* Barrier C (for pairing) */
	smp_mb();
#ifdef RING_POLL
	{
		unsigned index = ring.avail->ring[head & (ring_size - 1)];

		return (index ^ head ^ 0x8000) & ~(ring_size - 1);
	}
#else
	return head == ring.avail->idx;
#endif
}