diff --git a/drivers/fpga/intel/Makefile b/drivers/fpga/intel/Makefile
index 5c33216..26ef583 100644
--- a/drivers/fpga/intel/Makefile
+++ b/drivers/fpga/intel/Makefile
@@ -4,4 +4,4 @@ obj-$(CONFIG_INTEL_FPGA_AFU) += intel-fpga-afu.o
 
 intel-fpga-pci-objs := pcie.o feature-dev.o
 intel-fpga-fme-objs := fme-main.o fme-pr.o
-intel-fpga-afu-objs := afu-main.o afu-region.o
+intel-fpga-afu-objs := afu-main.o afu-region.o afu-dma-region.o
diff --git a/drivers/fpga/intel/afu-dma-region.c b/drivers/fpga/intel/afu-dma-region.c
new file mode 100644
index 0000000..5a525f1
--- /dev/null
+++ b/drivers/fpga/intel/afu-dma-region.c
@@ -0,0 +1,373 @@
+/*
+ * Driver for Intel FPGA Accelerated Function Unit (AFU) DMA Region Management
+ *
+ * Copyright (C) 2017 Intel Corporation, Inc.
+ *
+ * Authors:
+ *   Wu Hao <hao.wu@intel.com>
+ *   Xiao Guangrong <guangrong.xiao@linux.intel.com>
+ *
+ * This work is licensed under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license. See the
+ * LICENSE.BSD file under this directory for the BSD license and see
+ * the COPYING file in the top-level directory for the GPLv2 license.
+ */
+
+#include <linux/sched/signal.h>
+#include <linux/uaccess.h>
+
+#include "afu.h"
+
+static void put_all_pages(struct page **pages, int npages)
+{
+	int i;
+
+	for (i = 0; i < npages; i++)
+		if (pages[i] != NULL)
+			put_page(pages[i]);
+}
+
+void afu_dma_region_init(struct feature_platform_data *pdata)
+{
+	struct fpga_afu *afu = fpga_pdata_get_private(pdata);
+
+	afu->dma_regions = RB_ROOT;
+}
+
+static long afu_dma_adjust_locked_vm(struct device *dev, long npages, bool incr)
+{
+	unsigned long locked, lock_limit;
+	int ret = 0;
+
+	/* the task is exiting. */
+	if (!current->mm)
+		return 0;
+
+	down_write(&current->mm->mmap_sem);
+
+	if (incr) {
+		locked = current->mm->locked_vm + npages;
+		lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+
+		if (locked > lock_limit && !capable(CAP_IPC_LOCK))
+			ret = -ENOMEM;
+		else
+			current->mm->locked_vm += npages;
+	} else {
+
+		if (WARN_ON_ONCE(npages > current->mm->locked_vm))
+			npages = current->mm->locked_vm;
+		current->mm->locked_vm -= npages;
+	}
+
+	dev_dbg(dev, "[%d] RLIMIT_MEMLOCK %c%ld %ld/%ld%s\n", current->pid,
+				incr ? '+' : '-',
+				npages << PAGE_SHIFT,
+				current->mm->locked_vm << PAGE_SHIFT,
+				rlimit(RLIMIT_MEMLOCK),
+				ret ? "- execeeded" : "");
+
+	up_write(&current->mm->mmap_sem);
+
+	return ret;
+}
+
+static long afu_dma_pin_pages(struct feature_platform_data *pdata,
+				struct fpga_afu_dma_region *region)
+{
+	long npages = region->length >> PAGE_SHIFT;
+	struct device *dev = &pdata->dev->dev;
+	long ret, pinned;
+
+	ret = afu_dma_adjust_locked_vm(dev, npages, true);
+	if (ret)
+		return ret;
+
+	region->pages = kcalloc(npages, sizeof(struct page *), GFP_KERNEL);
+	if (!region->pages) {
+		afu_dma_adjust_locked_vm(dev, npages, false);
+		return -ENOMEM;
+	}
+
+	pinned = get_user_pages_fast(region->user_addr, npages, 1,
+					region->pages);
+	if (pinned < 0) {
+		ret = pinned;
+		goto err_put_pages;
+	} else if (pinned != npages) {
+		ret = -EFAULT;
+		goto err;
+	}
+
+	dev_dbg(dev, "%ld pages pinned\n", pinned);
+
+	return 0;
+
+err_put_pages:
+	put_all_pages(region->pages, pinned);
+err:
+	kfree(region->pages);
+	afu_dma_adjust_locked_vm(dev, npages, false);
+	return ret;
+}
+
+static void afu_dma_unpin_pages(struct feature_platform_data *pdata,
+				struct fpga_afu_dma_region *region)
+{
+	long npages = region->length >> PAGE_SHIFT;
+	struct device *dev = &pdata->dev->dev;
+
+	put_all_pages(region->pages, npages);
+	kfree(region->pages);
+	afu_dma_adjust_locked_vm(dev, npages, false);
+
+	dev_dbg(dev, "%ld pages unpinned\n", npages);
+}
+
+static bool afu_dma_check_continuous_pages(struct fpga_afu_dma_region *region)
+{
+	int npages = region->length >> PAGE_SHIFT;
+	int i;
+
+	for (i = 0; i < npages - 1; i++)
+		if (page_to_pfn(region->pages[i]) + 1 !=
+					page_to_pfn(region->pages[i+1]))
+			return false;
+
+	return true;
+}
+
+static bool dma_region_check_iova(struct fpga_afu_dma_region *region,
+				  u64 iova, u64 size)
+{
+	if (!size && region->iova != iova)
+		return false;
+
+	return (region->iova <= iova) &&
+		(region->length + region->iova >= iova + size);
+}
+
+/* Need to be called with pdata->lock held */
+static int afu_dma_region_add(struct feature_platform_data *pdata,
+					struct fpga_afu_dma_region *region)
+{
+	struct fpga_afu *afu = fpga_pdata_get_private(pdata);
+	struct rb_node **new, *parent = NULL;
+
+	dev_dbg(&pdata->dev->dev, "add region (iova = %llx)\n",
+					(unsigned long long)region->iova);
+
+	new = &(afu->dma_regions.rb_node);
+
+	while (*new) {
+		struct fpga_afu_dma_region *this;
+
+		this = container_of(*new, struct fpga_afu_dma_region, node);
+
+		parent = *new;
+
+		if (dma_region_check_iova(this, region->iova, region->length))
+			return -EEXIST;
+
+		if (region->iova < this->iova)
+			new = &((*new)->rb_left);
+		else if (region->iova > this->iova)
+			new = &((*new)->rb_right);
+		else
+			return -EEXIST;
+	}
+
+	rb_link_node(&region->node, parent, new);
+	rb_insert_color(&region->node, &afu->dma_regions);
+
+	return 0;
+}
+
+/* Need to be called with pdata->lock held */
+static void afu_dma_region_remove(struct feature_platform_data *pdata,
+					struct fpga_afu_dma_region *region)
+{
+	struct fpga_afu *afu;
+
+	dev_dbg(&pdata->dev->dev, "del region (iova = %llx)\n",
+					(unsigned long long)region->iova);
+
+	afu = fpga_pdata_get_private(pdata);
+	rb_erase(&region->node, &afu->dma_regions);
+}
+
+/* Need to be called with pdata->lock held */
+void afu_dma_region_destroy(struct feature_platform_data *pdata)
+{
+	struct fpga_afu *afu = fpga_pdata_get_private(pdata);
+	struct rb_node *node = rb_first(&afu->dma_regions);
+	struct fpga_afu_dma_region *region;
+
+	while (node) {
+		region = container_of(node, struct fpga_afu_dma_region, node);
+
+		dev_dbg(&pdata->dev->dev, "del region (iova = %llx)\n",
+					(unsigned long long)region->iova);
+
+		rb_erase(node, &afu->dma_regions);
+
+		if (region->iova)
+			dma_unmap_page(fpga_pdata_to_pcidev(pdata),
+					region->iova, region->length,
+					DMA_BIDIRECTIONAL);
+
+		if (region->pages)
+			afu_dma_unpin_pages(pdata, region);
+
+		node = rb_next(node);
+		kfree(region);
+	}
+}
+
+/*
+ * It finds the dma region from the rbtree based on @iova and @size:
+ * - if @size == 0, it finds the dma region which starts from @iova
+ * - otherwise, it finds the dma region which fully contains
+ *   [@iova, @iova+size)
+ * If nothing is matched returns NULL.
+ *
+ * Need to be called with pdata->lock held.
+ */
+struct fpga_afu_dma_region *
+afu_dma_region_find(struct feature_platform_data *pdata, u64 iova, u64 size)
+{
+	struct fpga_afu *afu = fpga_pdata_get_private(pdata);
+	struct rb_node *node = afu->dma_regions.rb_node;
+	struct device *dev = &pdata->dev->dev;
+
+	while (node) {
+		struct fpga_afu_dma_region *region;
+
+		region = container_of(node, struct fpga_afu_dma_region, node);
+
+		if (dma_region_check_iova(region, iova, size)) {
+			dev_dbg(dev, "find region (iova = %llx)\n",
+				(unsigned long long)region->iova);
+			return region;
+		}
+
+		if (iova < region->iova)
+			node = node->rb_left;
+		else if (iova > region->iova)
+			node = node->rb_right;
+		else
+			/* the iova region is not fully covered. */
+			break;
+	}
+
+	dev_dbg(dev, "region with iova %llx and size %llx is not found\n",
+		(unsigned long long)iova, (unsigned long long)size);
+	return NULL;
+}
+
+static struct fpga_afu_dma_region *
+afu_dma_region_find_iova(struct feature_platform_data *pdata, u64 iova)
+{
+	return afu_dma_region_find(pdata, iova, 0);
+}
+
+long afu_dma_map_region(struct feature_platform_data *pdata,
+		       u64 user_addr, u64 length, u64 *iova)
+{
+	struct fpga_afu_dma_region *region;
+	int ret;
+
+	/*
+	 * Check Inputs, only accept page-aligned user memory region with
+	 * valid length.
+	 */
+	if (!PAGE_ALIGNED(user_addr) || !PAGE_ALIGNED(length) || !length)
+		return -EINVAL;
+
+	/* Check overflow */
+	if (user_addr + length < user_addr)
+		return -EINVAL;
+
+	if (!access_ok(VERIFY_WRITE, user_addr, length))
+		return -EINVAL;
+
+	region = kzalloc(sizeof(*region), GFP_KERNEL);
+	if (!region)
+		return -ENOMEM;
+
+	region->user_addr = user_addr;
+	region->length = length;
+
+	/* Pin the user memory region */
+	ret = afu_dma_pin_pages(pdata, region);
+	if (ret) {
+		dev_err(&pdata->dev->dev, "fail to pin memory region\n");
+		goto free_region;
+	}
+
+	/* Only accept continuous pages, return error if no */
+	if (!afu_dma_check_continuous_pages(region)) {
+		dev_err(&pdata->dev->dev, "pages are not continuous\n");
+		ret = -EINVAL;
+		goto unpin_pages;
+	}
+
+	/* As pages are continuous then start to do DMA mapping */
+	region->iova = dma_map_page(fpga_pdata_to_pcidev(pdata),
+				    region->pages[0], 0,
+				    region->length,
+				    DMA_BIDIRECTIONAL);
+	if (dma_mapping_error(&pdata->dev->dev, region->iova)) {
+		dev_err(&pdata->dev->dev, "fail to map dma mapping\n");
+		ret = -EFAULT;
+		goto unpin_pages;
+	}
+
+	*iova = region->iova;
+
+	mutex_lock(&pdata->lock);
+	ret = afu_dma_region_add(pdata, region);
+	mutex_unlock(&pdata->lock);
+	if (ret) {
+		dev_err(&pdata->dev->dev, "fail to add dma region\n");
+		goto unmap_dma;
+	}
+
+	return 0;
+
+unmap_dma:
+	dma_unmap_page(fpga_pdata_to_pcidev(pdata),
+		       region->iova, region->length, DMA_BIDIRECTIONAL);
+unpin_pages:
+	afu_dma_unpin_pages(pdata, region);
+free_region:
+	kfree(region);
+	return ret;
+}
+
+long afu_dma_unmap_region(struct feature_platform_data *pdata, u64 iova)
+{
+	struct fpga_afu_dma_region *region;
+
+	mutex_lock(&pdata->lock);
+	region = afu_dma_region_find_iova(pdata, iova);
+	if (!region) {
+		mutex_unlock(&pdata->lock);
+		return -EINVAL;
+	}
+
+	if (region->in_use) {
+		mutex_unlock(&pdata->lock);
+		return -EBUSY;
+	}
+
+	afu_dma_region_remove(pdata, region);
+	mutex_unlock(&pdata->lock);
+
+	dma_unmap_page(fpga_pdata_to_pcidev(pdata),
+		       region->iova, region->length, DMA_BIDIRECTIONAL);
+	afu_dma_unpin_pages(pdata, region);
+	kfree(region);
+
+	return 0;
+}
diff --git a/drivers/fpga/intel/afu-main.c b/drivers/fpga/intel/afu-main.c
index db2aec3..782ff81 100644
--- a/drivers/fpga/intel/afu-main.c
+++ b/drivers/fpga/intel/afu-main.c
@@ -177,7 +177,11 @@ static int afu_release(struct inode *inode, struct file *filp)
 
 	dev_dbg(&pdev->dev, "Device File Release\n");
 
-	fpga_port_reset(pdev);
+	mutex_lock(&pdata->lock);
+	__fpga_port_reset(pdev);
+	afu_dma_region_destroy(pdata);
+	mutex_unlock(&pdata->lock);
+
 	feature_dev_use_end(pdata);
 	return 0;
 }
@@ -247,6 +251,55 @@ afu_ioctl_get_region_info(struct feature_platform_data *pdata, void __user *arg)
 	return 0;
 }
 
+static long
+afu_ioctl_dma_map(struct feature_platform_data *pdata, void __user *arg)
+{
+	struct fpga_port_dma_map map;
+	unsigned long minsz;
+	long ret;
+
+	minsz = offsetofend(struct fpga_port_dma_map, iova);
+
+	if (copy_from_user(&map, arg, minsz))
+		return -EFAULT;
+
+	if (map.argsz < minsz || map.flags)
+		return -EINVAL;
+
+	ret = afu_dma_map_region(pdata, map.user_addr, map.length, &map.iova);
+	if (ret)
+		return ret;
+
+	if (copy_to_user(arg, &map, sizeof(map))) {
+		afu_dma_unmap_region(pdata, map.iova);
+		return -EFAULT;
+	}
+
+	dev_dbg(&pdata->dev->dev, "dma map: ua=%llx, len=%llx, iova=%llx\n",
+				(unsigned long long)map.user_addr,
+				(unsigned long long)map.length,
+				(unsigned long long)map.iova);
+
+	return 0;
+}
+
+static long
+afu_ioctl_dma_unmap(struct feature_platform_data *pdata, void __user *arg)
+{
+	struct fpga_port_dma_unmap unmap;
+	unsigned long minsz;
+
+	minsz = offsetofend(struct fpga_port_dma_unmap, iova);
+
+	if (copy_from_user(&unmap, arg, minsz))
+		return -EFAULT;
+
+	if (unmap.argsz < minsz || unmap.flags)
+		return -EINVAL;
+
+	return afu_dma_unmap_region(pdata, unmap.iova);
+}
+
 static long afu_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	struct platform_device *pdev = filp->private_data;
@@ -265,6 +318,10 @@ static long afu_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		return afu_ioctl_get_info(pdata, (void __user *)arg);
 	case FPGA_PORT_GET_REGION_INFO:
 		return afu_ioctl_get_region_info(pdata, (void __user *)arg);
+	case FPGA_PORT_DMA_MAP:
+		return afu_ioctl_dma_map(pdata, (void __user *)arg);
+	case FPGA_PORT_DMA_UNMAP:
+		return afu_ioctl_dma_unmap(pdata, (void __user *)arg);
 	default:
 		/*
 		 * Let sub-feature's ioctl function to handle the cmd
@@ -339,6 +396,7 @@ static int afu_dev_init(struct platform_device *pdev)
 	mutex_lock(&pdata->lock);
 	fpga_pdata_set_private(pdata, afu);
 	afu_region_init(pdata);
+	afu_dma_region_init(pdata);
 	mutex_unlock(&pdata->lock);
 	return 0;
 }
@@ -351,6 +409,7 @@ static int afu_dev_destroy(struct platform_device *pdev)
 	mutex_lock(&pdata->lock);
 	afu = fpga_pdata_get_private(pdata);
 	afu_region_destroy(pdata);
+	afu_dma_region_destroy(pdata);
 	fpga_pdata_set_private(pdata, NULL);
 	mutex_unlock(&pdata->lock);
 
diff --git a/drivers/fpga/intel/afu.h b/drivers/fpga/intel/afu.h
index fca4dbc..fb46bd3 100644
--- a/drivers/fpga/intel/afu.h
+++ b/drivers/fpga/intel/afu.h
@@ -32,11 +32,21 @@ struct fpga_afu_region {
 	struct list_head node;
 };
 
+struct fpga_afu_dma_region {
+	u64 user_addr;
+	u64 length;
+	u64 iova;
+	struct page **pages;
+	struct rb_node node;
+	bool in_use;
+};
+
 struct fpga_afu {
 	u64 region_cur_offset;
 	int num_regions;
 	u8 num_umsgs;
 	struct list_head regions;
+	struct rb_root dma_regions;
 
 	struct feature_platform_data *pdata;
 };
@@ -51,4 +61,12 @@ int afu_get_region_by_offset(struct feature_platform_data *pdata,
 			    u64 offset, u64 size,
 			    struct fpga_afu_region *pregion);
 
+void afu_dma_region_init(struct feature_platform_data *pdata);
+void afu_dma_region_destroy(struct feature_platform_data *pdata);
+long afu_dma_map_region(struct feature_platform_data *pdata,
+		       u64 user_addr, u64 length, u64 *iova);
+long afu_dma_unmap_region(struct feature_platform_data *pdata, u64 iova);
+struct fpga_afu_dma_region *afu_dma_region_find(
+		struct feature_platform_data *pdata, u64 iova, u64 size);
+
 #endif
diff --git a/include/uapi/linux/intel-fpga.h b/include/uapi/linux/intel-fpga.h
index 86a5168..b584381 100644
--- a/include/uapi/linux/intel-fpga.h
+++ b/include/uapi/linux/intel-fpga.h
@@ -113,6 +113,43 @@ struct fpga_port_region_info {
 
 #define FPGA_PORT_GET_REGION_INFO	_IO(FPGA_MAGIC, PORT_BASE + 2)
 
+/**
+ * FPGA_PORT_DMA_MAP - _IOWR(FPGA_MAGIC, PORT_BASE + 3,
+ *						struct fpga_port_dma_map)
+ *
+ * Map the dma memory per user_addr and length which are provided by caller.
+ * Driver fills the iova in provided struct afu_port_dma_map.
+ * This interface only accepts page-size aligned user memory for dma mapping.
+ * Return: 0 on success, -errno on failure.
+ */
+struct fpga_port_dma_map {
+	/* Input */
+	__u32 argsz;		/* Structure length */
+	__u32 flags;		/* Zero for now */
+	__u64 user_addr;        /* Process virtual address */
+	__u64 length;           /* Length of mapping (bytes)*/
+	/* Output */
+	__u64 iova;             /* IO virtual address */
+};
+
+#define FPGA_PORT_DMA_MAP	_IO(FPGA_MAGIC, PORT_BASE + 3)
+
+/**
+ * FPGA_PORT_DMA_UNMAP - _IOW(FPGA_MAGIC, PORT_BASE + 4,
+ *						struct fpga_port_dma_unmap)
+ *
+ * Unmap the dma memory per iova provided by caller.
+ * Return: 0 on success, -errno on failure.
+ */
+struct fpga_port_dma_unmap {
+	/* Input */
+	__u32 argsz;		/* Structure length */
+	__u32 flags;		/* Zero for now */
+	__u64 iova;		/* IO virtual address */
+};
+
+#define FPGA_PORT_DMA_UNMAP	_IO(FPGA_MAGIC, PORT_BASE + 4)
+
 /* IOCTLs for FME file descriptor */
 
 /**
