From f5d125c53df7a67b8f9a477e5a793dc055271944 Mon Sep 17 00:00:00 2001
From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Wed, 11 Jan 2012 16:53:51 +0000
Subject: [PATCH] Add a memory barrier to bus_dmamap_sync(), as should have
 always been present. We need a sync instead of eieio, as eieio does not
 enforce storage ordering between main and device memory.

---
 sys/powerpc/powerpc/busdma_machdep.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/powerpc/powerpc/busdma_machdep.c b/sys/powerpc/powerpc/busdma_machdep.c
index 9ebc0970998f..7f9f8ec7a374 100644
--- a/sys/powerpc/powerpc/busdma_machdep.c
+++ b/sys/powerpc/powerpc/busdma_machdep.c
@@ -51,6 +51,7 @@ __FBSDID("$FreeBSD$");
 
 #include <machine/atomic.h>
 #include <machine/bus.h>
+#include <machine/cpufunc.h>
 #include <machine/md_var.h>
 
 #include "iommu_if.h"
@@ -979,6 +980,8 @@ _bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
 			dmat->bounce_zone->total_bounced++;
 		}
 	}
+
+	powerpc_sync();
 }
 
 static void