From 92bae70f8cbfbfad50b70e4c36914c9baf5682cb Mon Sep 17 00:00:00 2001
From: scottl <scottl@FreeBSD.org>
Date: Sat, 15 Jan 2005 19:26:17 +0000
Subject: Add bus_dmamap_load_mbuf_sg() to ia64

---
 sys/ia64/ia64/busdma_machdep.c | 45 ++++++++++++++++++++++++++++++++++++------
 sys/ia64/include/bus.h         |  2 ++
 2 files changed, 41 insertions(+), 6 deletions(-)

diff --git a/sys/ia64/ia64/busdma_machdep.c b/sys/ia64/ia64/busdma_machdep.c
index 32d7947..5cd539d 100644
--- a/sys/ia64/ia64/busdma_machdep.c
+++ b/sys/ia64/ia64/busdma_machdep.c
@@ -498,10 +498,10 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dmat,
 			struct thread *td,
 			int flags,
 			bus_addr_t *lastaddrp,
+			bus_dma_segment_t *segs;
 			int *segp,
 			int first)
 {
-	bus_dma_segment_t *segs;
 	bus_size_t sgsize;
 	bus_addr_t curaddr, lastaddr, baddr, bmask;
 	vm_offset_t vaddr;
@@ -510,8 +510,6 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dmat,
 	int seg;
 	pmap_t pmap;
 
-	segs = dmat->segments;
-
 	if (map == NULL)
 		map = &nobounce_dmamap;
 
@@ -652,7 +650,7 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
 	}
 
 	error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, NULL, flags,
-	    &lastaddr, &nsegs, 1);
+	    &lastaddr, dmat->segments, &nsegs, 1);
 
 	if (error == EINPROGRESS)
 		return (error);
@@ -691,7 +689,7 @@ bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
 				error = _bus_dmamap_load_buffer(dmat, map,
 						m->m_data, m->m_len,
 						NULL, flags, &lastaddr,
-						&nsegs, first);
+						dmat->segments, &nsegs, first);
 				first = 0;
 			}
 		}
@@ -709,6 +707,40 @@ bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
 	return (error);
 }
 
+int
+bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
+			struct mbuf *m0, bus_dma_segment_t *segs,
+			int *nsegs, int flags)
+{
+	int nsegs, error;
+
+	M_ASSERTPKTHDR(m0);
+
+	flags |= BUS_DMA_NOWAIT;
+	nsegs = 0;
+	error = 0;
+	if (m0->m_pkthdr.len <= dmat->maxsize) {
+		int first = 1;
+		bus_addr_t lastaddr = 0;
+		struct mbuf *m;
+
+		for (m = m0; m != NULL && error == 0; m = m->m_next) {
+			if (m->m_len > 0) {
+				error = _bus_dmamap_load_buffer(dmat, map,
+						m->m_data, m->m_len,
+						NULL, flags, &lastaddr,
+						segs, nsegs, first);
+				first = 0;
+			}
+		}
+		++*nsegs;
+	} else {
+		error = EINVAL;
+	}
+
+	return (error);
+}
+
 /*
  * Like _bus_dmamap_load(), but for uios.
  */
@@ -748,7 +780,8 @@ bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
 
 		if (minlen > 0) {
 			error = _bus_dmamap_load_buffer(dmat, map, addr,
-			    minlen, td, flags, &lastaddr, &nsegs, first);
+			    minlen, td, flags, &lastaddr, dmat->segments,
+			    &nsegs, first);
 			first = 0;
 
 			resid -= minlen;
diff --git a/sys/ia64/include/bus.h b/sys/ia64/include/bus.h
index eceedd6..0f0f40c 100644
--- a/sys/ia64/include/bus.h
+++ b/sys/ia64/include/bus.h
@@ -1010,6 +1010,8 @@ typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int,
 int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
     struct mbuf *mbuf, bus_dmamap_callback2_t *callback, void *callback_arg,
     int flags);
+int bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
+    struct mbuf *mbuf, bus_dma_segment_t *segs, int *nsegs, int flags);
 
 /*
  * Like bus_dmamap_load but for uios.  Note the use of the
-- 
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