diff --git a/mm/Kconfig b/mm/Kconfig
index 884ba3860ec8..477b5eeca511 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -513,6 +513,13 @@ config CMA_DEBUGFS
 	help
 	  Turns on the DebugFS interface for CMA.
 
+config CMA_DEBUGFS_BITMAP_HEX
+	bool "CMA debugfs add bitmap_hex node"
+	depends on CMA_DEBUGFS
+	help
+	  Turns on the bitmap_hex node under DEBUGFS, shows the bitmap in hex
+	  format.
+
 config CMA_SYSFS
 	bool "CMA information through sysfs interface"
 	depends on CMA && SYSFS
diff --git a/mm/Makefile b/mm/Makefile
index 8de8651da069..d072cadb4299 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -111,6 +111,7 @@ obj-$(CONFIG_CMA)	+= cma.o
 obj-$(CONFIG_MEMORY_BALLOON) += balloon_compaction.o
 obj-$(CONFIG_PAGE_EXTENSION) += page_ext.o
 obj-$(CONFIG_CMA_DEBUGFS) += cma_debug.o
+obj-$(CONFIG_CMA_DEBUGFS_BITMAP_HEX) += cma_debug_bitmap_hex.o
 obj-$(CONFIG_CMA_SYSFS) += cma_sysfs.o
 obj-$(CONFIG_USERFAULTFD) += userfaultfd.o
 obj-$(CONFIG_IDLE_PAGE_TRACKING) += page_idle.o
diff --git a/mm/cma_debug_bitmap_hex.c b/mm/cma_debug_bitmap_hex.c
new file mode 100644
index 000000000000..3239be097896
--- /dev/null
+++ b/mm/cma_debug_bitmap_hex.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * CMA DebugFS Interface
+ *
+ * Copyright (c) 2015 Sasha Levin <sasha.levin@oracle.com>
+ *
+ * Copyright (C) 2022 Rockchip Electronics Co. Ltd.
+ *
+ */
+
+#include <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/seq_file.h>
+#include <linux/cma.h>
+#include <linux/list.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm_types.h>
+
+#include "cma.h"
+
+static size_t
+u32_format_array_hex(char *buf, size_t bufsize, u32 *array, int array_size)
+{
+	int i = 0;
+
+	while (--array_size >= 0) {
+		size_t len;
+		char term = (array_size && (++i % 8)) ? ' ' : '\n';
+
+		len = snprintf(buf, bufsize, "%08X%c", *array++, term);
+		buf += len;
+		bufsize -= len;
+	}
+
+	return 0;
+}
+
+static int u32_array_open_hex(struct inode *inode, struct file *file)
+{
+	struct debugfs_u32_array *data = inode->i_private;
+	int size, elements = data->n_elements;
+	char *buf;
+
+	/*
+	 * Max size:
+	 *  - 8 digits + ' '/'\n' = 9 bytes per number
+	 *  - terminating NUL character
+	 */
+	size = elements * 9;
+	buf = kmalloc(size + 1, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	buf[size] = 0;
+
+	file->private_data = buf;
+	u32_format_array_hex(buf, size + 1, data->array, data->n_elements);
+
+	return nonseekable_open(inode, file);
+}
+
+static ssize_t
+u32_array_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
+{
+	size_t size = strlen(file->private_data);
+
+	return simple_read_from_buffer(buf, len, ppos,
+					file->private_data, size);
+}
+
+static int u32_array_release(struct inode *inode, struct file *file)
+{
+	kfree(file->private_data);
+
+	return 0;
+}
+
+static const struct file_operations u32_array_hex_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = u32_array_open_hex,
+	.release = u32_array_release,
+	.read	 = u32_array_read,
+	.llseek  = no_llseek,
+};
+
+static void debugfs_create_u32_array_hex(const char *name, umode_t mode,
+				  struct dentry *parent,
+				  struct debugfs_u32_array *array)
+{
+	debugfs_create_file_unsafe(name, mode, parent, array, &u32_array_hex_fops);
+}
+
+static int cma_debugfs_add_one(struct cma *cma, struct dentry *root_dentry)
+{
+	struct dentry *tmp;
+	char name[16];
+
+	scnprintf(name, sizeof(name), "cma-%s", cma->name);
+
+	tmp = debugfs_lookup(name, root_dentry);
+	if (!tmp)
+		return -EPROBE_DEFER;
+
+	debugfs_create_u32_array_hex("bitmap_hex", 0444, tmp, &cma->dfs_bitmap);
+
+	return 0;
+}
+
+static int __init rk_cma_debugfs_init(void)
+{
+	struct dentry *cma_debugfs_root;
+	int ret;
+	int i;
+
+	cma_debugfs_root = debugfs_lookup("cma", NULL);
+	if (!cma_debugfs_root)
+		return -EPROBE_DEFER;
+
+	for (i = 0; i < cma_area_count; i++) {
+		ret = cma_debugfs_add_one(&cma_areas[i], cma_debugfs_root);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+late_initcall(rk_cma_debugfs_init);