diff --git a/sys/dev/mpi3mr/mpi3mr.c b/sys/dev/mpi3mr/mpi3mr.c
--- a/sys/dev/mpi3mr/mpi3mr.c
+++ b/sys/dev/mpi3mr/mpi3mr.c
@@ -980,6 +980,11 @@
 	sc->admin_reply_ephase = 1;
 
 	if (!sc->admin_req) {
+		/*
+		 * We need to create the tag for the admin queue to get the
+		 * iofacts to see how many bits the controller decodes.  Solve
+		 * this chicken and egg problem by only doing lower 4GB DMA.
+		 */
 		if (bus_dma_tag_create(sc->mpi3mr_parent_dmat,    /* parent */
 					4, 0,			/* algnmnt, boundary */
 					BUS_SPACE_MAXADDR_32BIT,/* lowaddr */
@@ -1434,6 +1439,12 @@
 			MPI3_SGE_FLAGS_END_OF_LIST);
 
 
+	/*
+	 * We can't use sc->dma_loaddr / hiaddr here.  We set those only after
+	 * we get the iocfacts.  So allocate in the lower 4GB.  The amount of
+	 * data is tiny and we don't do this that often, so any bouncing we
+	 * might have to do isn't a cause for concern.
+	 */
         if (bus_dma_tag_create(sc->mpi3mr_parent_dmat,    /* parent */
 				4, 0,			/* algnmnt, boundary */
 				BUS_SPACE_MAXADDR_32BIT,/* lowaddr */
@@ -1668,6 +1679,22 @@
 	sc->max_host_ios = sc->facts.max_reqs -
 	    (MPI3MR_INTERNALCMDS_RESVD + 1);
 
+	/*
+	 * Set the DMA mask for the card.  dma_mask is the number of bits that
+	 * can have bits set in them.  Translate this into bus_dma loaddr/hiaddr
+	 * args.  Add sanity for more bits than address space or other overflow
+	 * situations.
+	 */
+	if (sc->facts.dma_mask == 0 ||
+	    (sc->facts.dma_mask >= sizeof(bus_addr_t) * 8))
+		sc->dma_loaddr = BUS_SPACE_MAXADDR;
+	else
+		sc->dma_loaddr = ~((1ull << sc->facts.dma_mask) - 1);
+	sc->dma_hiaddr = BUS_SPACE_MAXADDR;
+	mpi3mr_dprint(sc, MPI3MR_INFO,
+	    "dma_mask bits: %d loaddr 0x%jx hiaddr 0x%jx\n",
+	    sc->facts.dma_mask, sc->dma_loaddr, sc->dma_hiaddr);
+
 	return retval;
 }
 
diff --git a/sys/dev/mpi3mr/mpi3mr_pci.c b/sys/dev/mpi3mr/mpi3mr_pci.c
--- a/sys/dev/mpi3mr/mpi3mr_pci.c
+++ b/sys/dev/mpi3mr/mpi3mr_pci.c
@@ -273,6 +273,16 @@
 	sc->mpi3mr_btag = rman_get_bustag(sc->mpi3mr_regs_resource);
 	sc->mpi3mr_bhandle = rman_get_bushandle(sc->mpi3mr_regs_resource);
 
+	/*
+	 * XXX Perhaps we should move this to after we read iocfacts and use
+	 * that to create the proper parent tag.  However, to get the iocfacts
+	 * we need to have a dmatag for both the admin queue and the iocfacts
+	 * DMA transfer.  So for now, we just create a 'no restriction' tag and
+	 * use sc->dma_loaddr for all the other tag_create calls to get the
+	 * right value.  It would be nice if one could retroactively adjust a
+	 * created tag.  The Linux driver effectively does this by setting the
+	 * dma_mask on the device.
+	 */
 	/* Allocate the parent DMA tag */
 	if (bus_dma_tag_create(bus_get_dma_tag(dev),  	/* parent */
 				1, 0,			/* algnmnt, boundary */