Keep track of which DMA window was actually used to map the

request (not always the passed in DMA tag if we try direct-map
and then fall back to sgmap-mapped).  Use the actual window
when performing dmamap_sync and dmamap_unload operations.

From NetBSD

ok martin@

2 files changed, 10 insertions, 2 deletions

diff --git a/sys/arch/alpha/dev/bus_dma.c b/sys/arch/alpha/dev/bus_dma.c
index 6a2bf65b4f3..906d9169769 100644
--- a/sys/arch/alpha/dev/bus_dma.c
+++ b/sys/arch/alpha/dev/bus_dma.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bus_dma.c,v 1.17 2006/04/13 14:41:08 brad Exp $ */
+/* $OpenBSD: bus_dma.c,v 1.18 2006/05/12 20:48:19 brad Exp $ */
 /* $NetBSD: bus_dma.c,v 1.40 2000/07/17 04:47:56 thorpej Exp $ */
 
 /*-
@@ -106,6 +106,7 @@ _bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp)
 	map->_dm_flags = flags & ~(BUS_DMA_WAITOK|BUS_DMA_NOWAIT);
 	map->dm_mapsize = 0;		/* no valid mappings */
 	map->dm_nsegs = 0;
+	map->_dm_window = NULL;
 
 	*dmamp = map;
 	return (0);
@@ -268,6 +269,7 @@ _bus_dmamap_load_direct(t, map, buf, buflen, p, flags)
 	if (error == 0) {
 		map->dm_mapsize = buflen;
 		map->dm_nsegs = seg + 1;
+		map->_dm_window = t;
 	} else if (t->_next_window != NULL) {
 		/*
 		 * Give the next window a chance.
@@ -319,6 +321,7 @@ _bus_dmamap_load_mbuf_direct(t, map, m0, flags)
 	if (error == 0) {
 		map->dm_mapsize = m0->m_pkthdr.len;
 		map->dm_nsegs = seg + 1;
+		map->_dm_window = t;
 	} else if (t->_next_window != NULL) {
 		/*
 		 * Give the next window a chance.
@@ -382,6 +385,7 @@ _bus_dmamap_load_uio_direct(t, map, uio, flags)
 	if (error == 0) {
 		map->dm_mapsize = uio->uio_resid;
 		map->dm_nsegs = seg + 1;
+		map->_dm_window = t;
 	} else if (t->_next_window != NULL) {
 		/*
 		 * Give the next window a chance.
@@ -423,6 +427,7 @@ _bus_dmamap_unload(t, map)
 	 */
 	map->dm_mapsize = 0;
 	map->dm_nsegs = 0;
+	map->_dm_window = NULL;
 }
 
 /*
diff --git a/sys/arch/alpha/dev/sgmap_typedep.c b/sys/arch/alpha/dev/sgmap_typedep.c
index e5164260582..af24d7340a0 100644
--- a/sys/arch/alpha/dev/sgmap_typedep.c
+++ b/sys/arch/alpha/dev/sgmap_typedep.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sgmap_typedep.c,v 1.7 2006/04/13 14:41:08 brad Exp $ */
+/* $OpenBSD: sgmap_typedep.c,v 1.8 2006/05/12 20:48:19 brad Exp $ */
 /* $NetBSD: sgmap_typedep.c,v 1.17 2001/07/19 04:27:37 thorpej Exp $ */
 
 /*-
@@ -216,6 +216,7 @@ __C(SGMAP_TYPE,_load)(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
 	if (error == 0) {
 		map->dm_mapsize = buflen;
 		map->dm_nsegs = 1;
+		map->_dm_window = t;
 	} else if (t->_next_window != NULL) {
 		/* Give the next window a chance. */
 		error = bus_dmamap_load(t->_next_window, map, buf, buflen,
@@ -265,6 +266,7 @@ __C(SGMAP_TYPE,_load_mbuf)(bus_dma_tag_t t, bus_dmamap_t map,
 	if (error == 0) {
 		map->dm_mapsize = m0->m_pkthdr.len;
 		map->dm_nsegs = seg;
+		map->_dm_window = t;
 	} else {
 		/* Need to back out what we've done so far. */
 		map->dm_nsegs = seg - 1;
@@ -342,4 +344,5 @@ __C(SGMAP_TYPE,_unload)(bus_dma_tag_t t, bus_dmamap_t map,
 	/* Mark the mapping invalid. */
 	map->dm_mapsize = 0;
 	map->dm_nsegs = 0;
+	map->_dm_window = NULL;
 }