v4.19.13 snapshot.
diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
new file mode 100644
index 0000000..b7847eb
--- /dev/null
+++ b/arch/arm64/include/asm/dma-mapping.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_DMA_MAPPING_H
+#define __ASM_DMA_MAPPING_H
+
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <linux/vmalloc.h>
+
+#include <xen/xen.h>
+#include <asm/xen/hypervisor.h>
+
+extern const struct dma_map_ops dummy_dma_ops;
+
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+{
+ /*
+ * We expect no ISA devices, and all other DMA masters are expected to
+ * have someone call arch_setup_dma_ops at device creation time.
+ */
+ return &dummy_dma_ops;
+}
+
+void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
+ const struct iommu_ops *iommu, bool coherent);
+#define arch_setup_dma_ops arch_setup_dma_ops
+
+#ifdef CONFIG_IOMMU_DMA
+void arch_teardown_dma_ops(struct device *dev);
+#define arch_teardown_dma_ops arch_teardown_dma_ops
+#endif
+
+/* do not use this function in a driver */
+static inline bool is_device_dma_coherent(struct device *dev)
+{
+ return dev->archdata.dma_coherent;
+}
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_DMA_MAPPING_H */