Add bus_dmamap_load_ma() function to load map with the array of

vm_pages.  Provide trivial implementation which forwards the load to
_bus_dmamap_load_phys() page by page.  Right now all architectures use
bus_dmamap_load_ma_triv().

Tested by:	pho (as part of the functional patch)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 month

1 files changed, 13 insertions, 0 deletions

diff --git a/sys/sys/bus_dma.h b/sys/sys/bus_dma.h
index c3ac56e..5f096f8 100644
--- a/sys/sys/bus_dma.h
+++ b/sys/sys/bus_dma.h
@@ -247,6 +247,15 @@ int bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
 			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
  *     declarations.
@@ -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,