diff --git a/sys/arm/arm/busdma_machdep-v6.c b/sys/arm/arm/busdma_machdep-v6.c
index 31ebfe46c0d5..e7f01c447435 100644
--- a/sys/arm/arm/busdma_machdep-v6.c
+++ b/sys/arm/arm/busdma_machdep-v6.c
@@ -975,6 +975,16 @@ _bus_dmamap_load_phys(bus_dma_tag_t dmat,
 	return (0);
 }
 
+int
+_bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map,
+    struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
+    bus_dma_segment_t *segs, int *segp)
+{
+
+	return (bus_dmamap_load_ma_triv(dmat, map, ma, tlen, ma_offs, flags,
+	    segs, segp));
+}
+
 /*
  * Utility function to load a linear buffer.  segp contains
  * the starting segment on entrace, and the ending segment on exit.
diff --git a/sys/arm/arm/busdma_machdep.c b/sys/arm/arm/busdma_machdep.c
index 1fca1e8577ab..8ef8e03e7d8a 100644
--- a/sys/arm/arm/busdma_machdep.c
+++ b/sys/arm/arm/busdma_machdep.c
@@ -992,6 +992,17 @@ _bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t buf,
 	}
 	return (0);
 }
+
+int
+_bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map,
+    struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
+    bus_dma_segment_t *segs, int *segp)
+{
+
+	return (bus_dmamap_load_ma_triv(dmat, map, ma, tlen, ma_offs, flags,
+	    segs, segp));
+}
+
 /*
  * Utility function to load a linear buffer.  segp contains
  * the starting segment on entrance, and the ending segment on exit.
diff --git a/sys/ia64/ia64/busdma_machdep.c b/sys/ia64/ia64/busdma_machdep.c
index 770f29f01767..206fc6e7da8a 100644
--- a/sys/ia64/ia64/busdma_machdep.c
+++ b/sys/ia64/ia64/busdma_machdep.c
@@ -658,6 +658,17 @@ _bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map,
 	 */
 	return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */
 }
+
+int
+_bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map,
+    struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
+    bus_dma_segment_t *segs, int *segp)
+{
+
+	return (bus_dmamap_load_ma_triv(dmat, map, ma, tlen, ma_offs, flags,
+	    segs, segp));
+}
+
 /*
  * Utility function to load a linear buffer.  segp contains
  * the starting segment on entrace, and the ending segment on exit.
diff --git a/sys/kern/subr_bus_dma.c b/sys/kern/subr_bus_dma.c
index 999de3f5ba1e..a16d8c823e71 100644
--- a/sys/kern/subr_bus_dma.c
+++ b/sys/kern/subr_bus_dma.c
@@ -124,24 +124,33 @@ static int
 _bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
     int *nsegs, int flags)
 {
-	vm_paddr_t paddr;
-	bus_size_t len, tlen;
-	int error, i, ma_offs;
+	int error;
 
 	if ((bio->bio_flags & BIO_UNMAPPED) == 0) {
 		error = _bus_dmamap_load_buffer(dmat, map, bio->bio_data,
 		    bio->bio_bcount, kernel_pmap, flags, NULL, nsegs);
-		return (error);
+	} else {
+		error = _bus_dmamap_load_ma(dmat, map, bio->bio_ma,
+		    bio->bio_bcount, bio->bio_ma_offset, flags, NULL, nsegs);
 	}
+	return (error);
+}
+
+int
+bus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map,
+    struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
+    bus_dma_segment_t *segs, int *segp)
+{
+	vm_paddr_t paddr;
+	bus_size_t len;
+	int error, i;
 
 	error = 0;
-	tlen = bio->bio_bcount;
-	ma_offs = bio->bio_ma_offset;
 	for (i = 0; tlen > 0; i++, tlen -= len) {
 		len = min(PAGE_SIZE - ma_offs, tlen);
-		paddr = VM_PAGE_TO_PHYS(bio->bio_ma[i]) + ma_offs;
+		paddr = VM_PAGE_TO_PHYS(ma[i]) + ma_offs;
 		error = _bus_dmamap_load_phys(dmat, map, paddr, len,
-		    flags, NULL, nsegs);
+		    flags, segs, segp);
 		if (error != 0)
 			break;
 		ma_offs = 0;
diff --git a/sys/mips/mips/busdma_machdep.c b/sys/mips/mips/busdma_machdep.c
index f3275e6bec39..823ae9cb9745 100644
--- a/sys/mips/mips/busdma_machdep.c
+++ b/sys/mips/mips/busdma_machdep.c
@@ -878,6 +878,16 @@ _bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map,
 	return (0);
 }
 
+int
+_bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map,
+    struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
+    bus_dma_segment_t *segs, int *segp)
+{
+
+	return (bus_dmamap_load_ma_triv(dmat, map, ma, tlen, ma_offs, flags,
+	    segs, segp));
+}
+
 /*
  * Utility function to load a linear buffer.  segp contains
  * the starting segment on entrance, and the ending segment on exit.
diff --git a/sys/powerpc/powerpc/busdma_machdep.c b/sys/powerpc/powerpc/busdma_machdep.c
index 144b7f9b7300..e35ecec57fe2 100644
--- a/sys/powerpc/powerpc/busdma_machdep.c
+++ b/sys/powerpc/powerpc/busdma_machdep.c
@@ -754,6 +754,16 @@ _bus_dmamap_load_phys(bus_dma_tag_t dmat,
 	return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */
 }
 
+int
+_bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map,
+    struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
+    bus_dma_segment_t *segs, int *segp)
+{
+
+	return (bus_dmamap_load_ma_triv(dmat, map, ma, tlen, ma_offs, flags,
+	    segs, segp));
+}
+
 /*
  * Utility function to load a linear buffer.  segp contains
  * the starting segment on entrance, and the ending segment on exit.
diff --git a/sys/sparc64/include/bus_dma.h b/sys/sparc64/include/bus_dma.h
index 7395794692a7..7d74419cc6fc 100644
--- a/sys/sparc64/include/bus_dma.h
+++ b/sys/sparc64/include/bus_dma.h
@@ -146,5 +146,7 @@ struct bus_dma_tag {
 	((t)->dt_mt->dm_dmamem_alloc((t), (v), (f), (m)))
 #define	bus_dmamem_free(t, v, m)					\
 	((t)->dt_mt->dm_dmamem_free((t), (v), (m)))
+#define _bus_dmamap_load_ma(t, m, a, tt, o, f, s, p)			\
+	bus_dmamap_load_ma_triv((t), (m), (a), (tt), (o), (f), (s), (p))
 
 #endif /* !_SPARC64_BUS_DMA_H_ */
diff --git a/sys/sys/bus_dma.h b/sys/sys/bus_dma.h
index c3ac56eccb42..5f096f81b5c1 100644
--- a/sys/sys/bus_dma.h
+++ b/sys/sys/bus_dma.h
@@ -246,6 +246,15 @@ int bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
 			struct memdesc *mem, bus_dmamap_callback_t *callback,
 			void *callback_arg, int flags);
 
+/*
+ * Placeholder for use by busdma implementations which do not benefit
+ * from optimized procedure to load an array of vm_page_t.  Falls back
+ * to do _bus_dmamap_load_phys() in loop.
+ */
+int bus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map,
+    struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
+    bus_dma_segment_t *segs, int *segp);
+
 /*
  * XXX sparc64 uses the same interface, but a much different implementation.
  *     <machine/bus_dma.h> for the sparc64 arch contains the equivalent
@@ -324,6 +333,10 @@ int _bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map,
 			  vm_paddr_t paddr, bus_size_t buflen,
 			  int flags, bus_dma_segment_t *segs, int *segp);
 
+int _bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map,
+    struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
+    bus_dma_segment_t *segs, int *segp);
+
 bus_dma_segment_t *_bus_dmamap_complete(bus_dma_tag_t dmat,
 			   		bus_dmamap_t map,
 					bus_dma_segment_t *segs,
diff --git a/sys/x86/x86/busdma_machdep.c b/sys/x86/x86/busdma_machdep.c
index 0b5961683f3b..722335421331 100644
--- a/sys/x86/x86/busdma_machdep.c
+++ b/sys/x86/x86/busdma_machdep.c
@@ -849,6 +849,16 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dmat,
 	return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */
 }
 
+int
+_bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map,
+    struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
+    bus_dma_segment_t *segs, int *segp)
+{
+
+	return (bus_dmamap_load_ma_triv(dmat, map, ma, tlen, ma_offs, flags,
+	    segs, segp));
+}
+
 void
 __bus_dmamap_waitok(bus_dma_tag_t dmat, bus_dmamap_t map,
 		    struct memdesc *mem, bus_dmamap_callback_t *callback,