diff --git a/arch/loongarch/include/asm/dma-direct.h b/arch/loongarch/include/asm/dma-direct.h
new file mode 100644
index 0000000000000000000000000000000000000000..a8fbae3bd5dac31ff8fb7d05c2370ddadd1cae38
--- /dev/null
+++ b/arch/loongarch/include/asm/dma-direct.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_LOONGARCH_DMA_DIRECT_H
+#define _ASM_LOONGARCH_DMA_DIRECT_H
+
+extern int node_id_offset;
+
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+	long nid = (paddr >> 44) & 0xf;
+
+	return ((nid << 44) ^ paddr) | (nid << node_id_offset);
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+	long nid = (daddr >> node_id_offset) & 0xf;
+
+	return ((nid << node_id_offset) ^ daddr) | (nid << 44);
+}
+
+#endif /* _ASM_LOONGARCH_DMA_DIRECT_H */
diff --git a/arch/loongarch/include/uapi/asm/setup.h b/arch/loongarch/include/uapi/asm/setup.h
new file mode 100644
index 0000000000000000000000000000000000000000..5d703888f35110d2a7a15ec1836bffcffae3c8bb
--- /dev/null
+++ b/arch/loongarch/include/uapi/asm/setup.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Based on arch/arm/include/asm/setup.h
+ *
+ * Copyright (C) 1997-1999 Russell King
+ * 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_SETUP_H
+#define __ASM_SETUP_H
+
+#include <linux/types.h>
+
+#define COMMAND_LINE_SIZE	2048
+
+#endif
diff --git a/arch/loongarch/kernel/dma.c b/arch/loongarch/kernel/dma.c
index cc0ccde58db87f8ddd6d5e568f40f864bd55b0c1..34836408b15a3cb40d3be26653feb1993c6a11f0 100644
--- a/arch/loongarch/kernel/dma.c
+++ b/arch/loongarch/kernel/dma.c
@@ -11,21 +11,8 @@
  * 48bit physical address space and embed it into 40bit.
  */
 
-static int node_id_offset;
-
-dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
-	long nid = (paddr >> 44) & 0xf;
-
-	return ((nid << 44) ^ paddr) | (nid << node_id_offset);
-}
-
-phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
-	long nid = (daddr >> node_id_offset) & 0xf;
-
-	return ((nid << node_id_offset) ^ daddr) | (nid << 44);
-}
+int node_id_offset;
+EXPORT_SYMBOL_GPL(node_id_offset);
 
 void acpi_arch_dma_setup(struct device *dev)
 {