Index: sys/dev/ioat/ioat.c
===================================================================
--- sys/dev/ioat/ioat.c
+++ sys/dev/ioat/ioat.c
@@ -324,6 +324,7 @@
 ioat_detach(device_t device)
 {
 	struct ioat_softc *ioat;
+	int i, error;
 
 	ioat = DEVICE2SOFTC(device);
 
@@ -359,6 +360,26 @@
 		bus_release_resource(device, SYS_RES_MEMORY,
 		    ioat->pci_resource_id, ioat->pci_resource);
 
+	for (i = 0; i < 1 << ioat->ring_size_order; i++) {
+		error = bus_dmamap_destroy(ioat->data_tag,
+		    ioat->ring[i].src_dmamap);
+		if (error != 0) {
+			ioat_log_message(0,
+			    "%s: bus_dmamap_destroy failed %d\n", __func__,
+			    error);
+			return (error);
+		}
+		error = bus_dmamap_destroy(ioat->data_tag,
+		    ioat->ring[i].dst_dmamap);
+		if (error != 0) {
+			ioat_log_message(0,
+			    "%s: bus_dmamap_destroy failed %d\n", __func__,
+			    error);
+			return (error);
+		}
+	}
+	bus_dma_tag_destroy(ioat->data_tag);
+
 	if (ioat->ring != NULL)
 		ioat_free_ring(ioat, 1 << ioat->ring_size_order, ioat->ring);
 
@@ -523,6 +544,15 @@
 
 	ioat->hw_desc_ring = hw_desc;
 
+	error = bus_dma_tag_create(bus_get_dma_tag(ioat->device),
+	    1, 0, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
+	    ioat->max_xfer_size, 1, ioat->max_xfer_size, 0, NULL, NULL,
+	    &ioat->data_tag);
+	if (error != 0) {
+		ioat_log_message(0, "%s: bus_dma_tag_create failed %d\n",
+		    __func__, error);
+		return (error);
+	}
 	ioat->ring = malloc(num_descriptors * sizeof(*ring), M_IOAT,
 	    M_ZERO | M_WAITOK);
 
@@ -530,6 +560,22 @@
 	for (i = 0; i < num_descriptors; i++) {
 		memset(&ring[i].bus_dmadesc, 0, sizeof(ring[i].bus_dmadesc));
 		ring[i].id = i;
+		error = bus_dmamap_create(ioat->data_tag, 0,
+                    &ring[i].src_dmamap);
+		if (error != 0) {
+			ioat_log_message(0,
+			    "%s: bus_dmamap_create failed %d\n", __func__,
+			    error);
+			return (error);
+		}
+		error = bus_dmamap_create(ioat->data_tag, 0,
+                    &ring[i].dst_dmamap);
+		if (error != 0) {
+			ioat_log_message(0,
+			    "%s: bus_dmamap_create failed %d\n", __func__,
+			    error);
+			return (error);
+		}
 	}
 
 	for (i = 0; i < num_descriptors; i++) {
@@ -724,6 +770,9 @@
 		    ioat->chan_idx, ioat->tail, dmadesc, dmadesc->callback_fn,
 		    dmadesc->callback_arg);
 
+		bus_dmamap_unload(ioat->data_tag, desc->dst_dmamap);
+		bus_dmamap_unload(ioat->data_tag, desc->src_dmamap);
+
 		if (dmadesc->callback_fn != NULL)
 			dmadesc->callback_fn(dmadesc->callback_arg, 0);
 
@@ -999,7 +1048,8 @@
 {
 	struct ioat_generic_hw_descriptor *hw_desc;
 	struct ioat_descriptor *desc;
-	int mflags;
+	bus_dma_segment_t seg;
+	int mflags, nseg, error;
 
 	mtx_assert(&ioat->submit_lock, MA_OWNED);
 
@@ -1032,9 +1082,27 @@
 		hw_desc->u.control_generic.fence = 1;
 
 	hw_desc->size = size;
-	hw_desc->src_addr = src;
-	hw_desc->dest_addr = dst;
 
+	nseg = -1;
+	error = _bus_dmamap_load_phys(ioat->data_tag, desc->src_dmamap,
+	    src, size, 0, &seg, &nseg);
+	if (error != 0) {
+		ioat_log_message(0, "%s: _bus_dmamap_load_phys failed %d\n",
+		    __func__, error);
+		return (NULL);
+	}
+	hw_desc->src_addr = seg.ds_addr;
+
+	nseg = -1;
+	error = _bus_dmamap_load_phys(ioat->data_tag, desc->dst_dmamap,
+	    dst, size, 0, &seg, &nseg);
+	if (error != 0) {
+		ioat_log_message(0, "%s: _bus_dmamap_load_phys failed %d\n",
+		    __func__, error);
+		return (NULL);
+	}
+	hw_desc->dest_addr = seg.ds_addr;
+
 	desc->bus_dmadesc.callback_fn = callback_fn;
 	desc->bus_dmadesc.callback_arg = callback_arg;
 	return (desc);
Index: sys/dev/ioat/ioat_internal.h
===================================================================
--- sys/dev/ioat/ioat_internal.h
+++ sys/dev/ioat/ioat_internal.h
@@ -414,6 +414,8 @@
 struct ioat_descriptor {
 	struct bus_dmadesc	bus_dmadesc;
 	uint32_t		id;
+	bus_dmamap_t		src_dmamap;
+	bus_dmamap_t		dst_dmamap;
 };
 
 /* Unused by this driver at this time. */
@@ -457,6 +459,8 @@
 	bus_dma_tag_t		hw_desc_tag;
 	bus_dmamap_t		hw_desc_map;
 
+	bus_dma_tag_t		data_tag;
+
 	bus_dma_tag_t		comp_update_tag;
 	bus_dmamap_t		comp_update_map;
 	uint64_t		*comp_update;