msi_eq_alloc
struct msi_eq *msi_eq_alloc(bus_dma_tag_t, int, int);
pbm->pp_meq = msi_eq_alloc(pbm->pp_dmat, msi_eq_size, num_eq);
eq->eq_meq = msi_eq_alloc(sc->sc_dmat, msi_eq_size, 1);