x86: move dma_map_sg to common header

the old i386 implementation is moved to pci-base_32.c

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/x86/kernel/pci-base_32.c b/arch/x86/kernel/pci-base_32.c
index a8a7c7f2d23f..24741525901c 100644
--- a/arch/x86/kernel/pci-base_32.c
+++ b/arch/x86/kernel/pci-base_32.c
@@ -12,9 +12,28 @@ static dma_addr_t pci32_map_single(struct device *dev, void *ptr,
 	return virt_to_phys(ptr);
 }
 
+static int pci32_dma_map_sg(struct device *dev, struct scatterlist *sglist,
+			    int nents, int direction)
+{
+	struct scatterlist *sg;
+	int i;
+
+	WARN_ON(nents == 0 || sglist[0].length == 0);
+
+	for_each_sg(sglist, sg, nents, i) {
+		BUG_ON(!sg_page(sg));
+
+		sg->dma_address = sg_phys(sg);
+	}
+
+	flush_write_buffers();
+	return nents;
+}
+
 static const struct dma_mapping_ops pci32_dma_ops = {
 	.map_single = pci32_map_single,
 	.unmap_single = NULL,
+	.map_sg = pci32_dma_map_sg,
 };
 
 const struct dma_mapping_ops *dma_ops = &pci32_dma_ops;