ntb_link_is_up
bool ntb_link_is_up(device_t ntb, enum ntb_speed *speed, enum ntb_width *width);
DEVMETHOD(ntb_link_is_up, amd_ntb_link_is_up),
DEVMETHOD(ntb_link_is_up, intel_ntb_link_is_up),
DEVMETHOD(ntb_link_is_up, ntb_plx_link_is_up),
if (ntb_link_is_up(nt->dev, &nt->link_speed, &nt->link_width)) {
if (ntb_link_is_up(dev, &nt->link_speed, &nt->link_width))
up = ntb_link_is_up(tc->dev, &speed, &width);
val = ntb_link_is_up(tc->dev, NULL, NULL) & tc->link_mask;
up = ntb_link_is_up(tc->dev, NULL, NULL);