Esempi in C++ (Cpp) per vring_get_used_idx

Esempio n. 1

File: vring.c Progetto: pacificIT/qemu

/* Map the guest's vring to host memory */
bool vring_setup(Vring *vring, VirtIODevice *vdev, int n)
{
    hwaddr vring_addr = virtio_queue_get_ring_addr(vdev, n);
    hwaddr vring_size = virtio_queue_get_ring_size(vdev, n);
    void *vring_ptr;

    vring->broken = false;

    vring_ptr = vring_map(&vring->mr, vring_addr, vring_size, true);
    if (!vring_ptr) {
        error_report("Failed to map vring "
                     "addr %#" HWADDR_PRIx " size %" HWADDR_PRIu,
                     vring_addr, vring_size);
        vring->broken = true;
        return false;
    }

    vring_init(&vring->vr, virtio_queue_get_num(vdev, n), vring_ptr, 4096);

    vring->last_avail_idx = virtio_queue_get_last_avail_idx(vdev, n);
    vring->last_used_idx = vring_get_used_idx(vdev, vring);
    vring->signalled_used = 0;
    vring->signalled_used_valid = false;

    trace_vring_setup(virtio_queue_get_ring_addr(vdev, n),
                      vring->vr.desc, vring->vr.avail, vring->vr.used);
    return true;
}

Esempio n. 2

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

/* Map the guest's vring to host memory */
bool vring_setup(Vring *vring, VirtIODevice *vdev, int n)
{
    struct vring *vr = &vring->vr;
    hwaddr addr;
    hwaddr size;
    void *ptr;

    vring->broken = false;
    vr->num = virtio_queue_get_num(vdev, n);

    addr = virtio_queue_get_desc_addr(vdev, n);
    size = virtio_queue_get_desc_size(vdev, n);
    /* Map the descriptor area as read only */
    ptr = vring_map(&vring->mr_desc, addr, size, NULL, false);
    if (!ptr) {
        error_report("Failed to map 0x%" HWADDR_PRIx " byte for vring desc "
                     "at 0x%" HWADDR_PRIx,
                      size, addr);
        goto out_err_desc;
    }
    vr->desc = ptr;

    addr = virtio_queue_get_avail_addr(vdev, n);
    size = virtio_queue_get_avail_size(vdev, n);
    /* Add the size of the used_event_idx */
    size += sizeof(uint16_t);
    /* Map the driver area as read only */
    ptr = vring_map(&vring->mr_avail, addr, size, NULL, false);
    if (!ptr) {
        error_report("Failed to map 0x%" HWADDR_PRIx " byte for vring avail "
                     "at 0x%" HWADDR_PRIx,
                      size, addr);
        goto out_err_avail;
    }
    vr->avail = ptr;

    addr = virtio_queue_get_used_addr(vdev, n);
    size = virtio_queue_get_used_size(vdev, n);
    /* Add the size of the avail_event_idx */
    size += sizeof(uint16_t);
    /* Map the device area as read-write */
    ptr = vring_map(&vring->mr_used, addr, size, NULL, true);
    if (!ptr) {
        error_report("Failed to map 0x%" HWADDR_PRIx " byte for vring used "
                     "at 0x%" HWADDR_PRIx,
                      size, addr);
        goto out_err_used;
    }
    vr->used = ptr;

    vring->last_avail_idx = virtio_queue_get_last_avail_idx(vdev, n);
    vring->last_used_idx = vring_get_used_idx(vdev, vring);
    vring->signalled_used = 0;
    vring->signalled_used_valid = false;

    trace_vring_setup(virtio_queue_get_ring_addr(vdev, n),
                      vring->vr.desc, vring->vr.avail, vring->vr.used);
    return true;

out_err_used:
    memory_region_unref(vring->mr_avail);
out_err_avail:
    memory_region_unref(vring->mr_desc);
out_err_desc:
    vring->broken = true;
    return false;
}