[PATCH V3 XRT Alveo 02/18] fpga: xrt: driver metadata helper functions

[Lizhi Hou <lizhi.hou@xilinx.com>]

XRT drivers use device tree as metadata format to discover HW subsystems
behind PCIe BAR. Thus libfdt functions are called for driver to parse
device tree blob.

Signed-off-by: Sonal Santan <sonal.santan@xilinx.com>
Signed-off-by: Max Zhen <max.zhen@xilinx.com>
Signed-off-by: Lizhi Hou <lizhih@xilinx.com>
---
 drivers/fpga/xrt/include/metadata.h  | 229 ++++++++++++
 drivers/fpga/xrt/metadata/metadata.c | 524 +++++++++++++++++++++++++++
 2 files changed, 753 insertions(+)
 create mode 100644 drivers/fpga/xrt/include/metadata.h
 create mode 100644 drivers/fpga/xrt/metadata/metadata.c

diff --git a/drivers/fpga/xrt/include/metadata.h b/drivers/fpga/xrt/include/metadata.h
new file mode 100644
index 000000000000..b929bc469b73
--- /dev/null
+++ b/drivers/fpga/xrt/include/metadata.h
@@ -0,0 +1,229 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Header file for Xilinx Runtime (XRT) driver
+ *
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ *      Lizhi Hou <Lizhi.Hou@xilinx.com>
+ */
+
+#ifndef _XRT_METADATA_H
+#define _XRT_METADATA_H
+
+#include <linux/device.h>
+#include <linux/vmalloc.h>
+#include <linux/uuid.h>
+
+#define XRT_MD_INVALID_LENGTH (~0UL)
+
+#define XRT_MD_PROP_COMPATIBLE "compatible"
+#define XRT_MD_PROP_PF_NUM "pcie_physical_function"
+#define XRT_MD_PROP_BAR_IDX "pcie_bar_mapping"
+#define XRT_MD_PROP_IO_OFFSET "reg"
+#define XRT_MD_PROP_INTERRUPTS "interrupts"
+#define XRT_MD_PROP_INTERFACE_UUID "interface_uuid"
+#define XRT_MD_PROP_LOGIC_UUID "logic_uuid"
+#define XRT_MD_PROP_VERSION_MAJOR "firmware_version_major"
+
+#define XRT_MD_PROP_HWICAP "axi_hwicap"
+#define XRT_MD_PROP_PDI_CONFIG "pdi_config_mem"
+
+#define XRT_MD_NODE_ENDPOINTS "addressable_endpoints"
+#define XRT_MD_INTERFACES_PATH "/interfaces"
+
+#define XRT_MD_NODE_FIRMWARE "firmware"
+#define XRT_MD_NODE_INTERFACES "interfaces"
+#define XRT_MD_NODE_PARTITION_INFO "partition_info"
+
+#define XRT_MD_NODE_FLASH "ep_card_flash_program_00"
+#define XRT_MD_NODE_XVC_PUB "ep_debug_bscan_user_00"
+#define XRT_MD_NODE_XVC_PRI "ep_debug_bscan_mgmt_00"
+#define XRT_MD_NODE_SYSMON "ep_cmp_sysmon_00"
+#define XRT_MD_NODE_AF_BLP_CTRL_MGMT "ep_firewall_blp_ctrl_mgmt_00"
+#define XRT_MD_NODE_AF_BLP_CTRL_USER "ep_firewall_blp_ctrl_user_00"
+#define XRT_MD_NODE_AF_CTRL_MGMT "ep_firewall_ctrl_mgmt_00"
+#define XRT_MD_NODE_AF_CTRL_USER "ep_firewall_ctrl_user_00"
+#define XRT_MD_NODE_AF_CTRL_DEBUG "ep_firewall_ctrl_debug_00"
+#define XRT_MD_NODE_AF_DATA_H2C "ep_firewall_data_h2c_00"
+#define XRT_MD_NODE_AF_DATA_C2H "ep_firewall_data_c2h_00"
+#define XRT_MD_NODE_AF_DATA_P2P "ep_firewall_data_p2p_00"
+#define XRT_MD_NODE_AF_DATA_M2M "ep_firewall_data_m2m_00"
+#define XRT_MD_NODE_CMC_REG "ep_cmc_regmap_00"
+#define XRT_MD_NODE_CMC_RESET "ep_cmc_reset_00"
+#define XRT_MD_NODE_CMC_MUTEX "ep_cmc_mutex_00"
+#define XRT_MD_NODE_CMC_FW_MEM "ep_cmc_firmware_mem_00"
+#define XRT_MD_NODE_ERT_FW_MEM "ep_ert_firmware_mem_00"
+#define XRT_MD_NODE_ERT_CQ_MGMT "ep_ert_command_queue_mgmt_00"
+#define XRT_MD_NODE_ERT_CQ_USER "ep_ert_command_queue_user_00"
+#define XRT_MD_NODE_MAILBOX_MGMT "ep_mailbox_mgmt_00"
+#define XRT_MD_NODE_MAILBOX_USER "ep_mailbox_user_00"
+#define XRT_MD_NODE_GATE_PLP "ep_pr_isolate_plp_00"
+#define XRT_MD_NODE_GATE_ULP "ep_pr_isolate_ulp_00"
+#define XRT_MD_NODE_PCIE_MON "ep_pcie_link_mon_00"
+#define XRT_MD_NODE_DDR_CALIB "ep_ddr_mem_calib_00"
+#define XRT_MD_NODE_CLK_KERNEL1 "ep_aclk_kernel_00"
+#define XRT_MD_NODE_CLK_KERNEL2 "ep_aclk_kernel_01"
+#define XRT_MD_NODE_CLK_KERNEL3 "ep_aclk_hbm_00"
+#define XRT_MD_NODE_KDMA_CTRL "ep_kdma_ctrl_00"
+#define XRT_MD_NODE_FPGA_CONFIG "ep_fpga_configuration_00"
+#define XRT_MD_NODE_ERT_SCHED "ep_ert_sched_00"
+#define XRT_MD_NODE_XDMA "ep_xdma_00"
+#define XRT_MD_NODE_MSIX "ep_msix_00"
+#define XRT_MD_NODE_QDMA "ep_qdma_00"
+#define XRT_MD_XRT_MD_NODE_QDMA4 "ep_qdma4_00"
+#define XRT_MD_NODE_STM "ep_stream_traffic_manager_00"
+#define XRT_MD_NODE_STM4 "ep_stream_traffic_manager4_00"
+#define XRT_MD_NODE_CLK_SHUTDOWN "ep_aclk_shutdown_00"
+#define XRT_MD_NODE_ERT_BASE "ep_ert_base_address_00"
+#define XRT_MD_NODE_ERT_RESET "ep_ert_reset_00"
+#define XRT_MD_NODE_CLKFREQ_K1 "ep_freq_cnt_aclk_kernel_00"
+#define XRT_MD_NODE_CLKFREQ_K2 "ep_freq_cnt_aclk_kernel_01"
+#define XRT_MD_NODE_CLKFREQ_HBM "ep_freq_cnt_aclk_hbm_00"
+#define XRT_MD_NODE_GAPPING "ep_gapping_demand_00"
+#define XRT_MD_NODE_UCS_CONTROL_STATUS "ep_ucs_control_status_00"
+#define XRT_MD_NODE_P2P "ep_p2p_00"
+#define XRT_MD_NODE_REMAP_P2P "ep_remap_p2p_00"
+#define XRT_MD_NODE_DDR4_RESET_GATE "ep_ddr_mem_srsr_gate_00"
+#define XRT_MD_NODE_ADDR_TRANSLATOR "ep_remap_data_c2h_00"
+#define XRT_MD_NODE_MAILBOX_XRT "ep_mailbox_user_to_ert_00"
+#define XRT_MD_NODE_PMC_INTR   "ep_pmc_intr_00"
+#define XRT_MD_NODE_PMC_MUX    "ep_pmc_mux_00"
+
+/* driver defined endpoints */
+#define XRT_MD_NODE_VSEC "drv_ep_vsec_00"
+#define XRT_MD_NODE_VSEC_GOLDEN "drv_ep_vsec_golden_00"
+#define XRT_MD_NODE_BLP_ROM "drv_ep_blp_rom_00"
+#define XRT_MD_NODE_MAILBOX_VSEC "ep_mailbox_vsec_00"
+#define XRT_MD_NODE_PLAT_INFO "drv_ep_platform_info_mgmt_00"
+#define XRT_MD_NODE_TEST "drv_ep_test_00"
+#define XRT_MD_NODE_MGMT_MAIN "drv_ep_mgmt_main_00"
+#define XRT_MD_NODE_FLASH_VSEC "drv_ep_card_flash_program_00"
+#define XRT_MD_NODE_GOLDEN_VER "drv_ep_golden_ver_00"
+#define XRT_MD_XRT_MD_NODE_PARTITION_INFO_BLP "partition_info_0"
+#define XRT_MD_XRT_MD_NODE_PARTITION_INFO_PLP "partition_info_1"
+
+#define XRT_MD_NODE_DDR_SRSR "drv_ep_ddr_srsr"
+#define XRT_MD_REGMAP_DDR_SRSR "drv_ddr_srsr"
+
+#define XRT_MD_PROP_OFFSET "drv_offset"
+#define XRT_MD_PROP_CLK_FREQ "drv_clock_frequency"
+#define XRT_MD_PROP_CLK_CNT "drv_clock_frequency_counter"
+#define XRT_MD_PROP_VBNV "vbnv"
+#define XRT_MD_PROP_VROM "vrom"
+#define XRT_MD_PROP_PARTITION_LEVEL "partition_level"
+
+struct xrt_md_endpoint {
+	const char	*ep_name;
+	u32		bar;
+	long		bar_off;
+	ulong		size;
+	char		*regmap;
+	char		*regmap_ver;
+};
+
+/* Note: res_id is defined by leaf driver and must start with 0. */
+struct xrt_iores_map {
+	char		*res_name;
+	int		res_id;
+};
+
+static inline int xrt_md_res_name2id(const struct xrt_iores_map *res_map,
+				     int entry_num, const char *res_name)
+{
+	int i;
+
+	for (i = 0; i < entry_num; i++) {
+		if (!strcmp(res_name, res_map->res_name))
+			return res_map->res_id;
+		res_map++;
+	}
+	return -1;
+}
+
+static inline const char *
+xrt_md_res_id2name(const struct xrt_iores_map *res_map, int entry_num, int id)
+{
+	int i;
+
+	for (i = 0; i < entry_num; i++) {
+		if (res_map->res_id == id)
+			return res_map->res_name;
+		res_map++;
+	}
+	return NULL;
+}
+
+unsigned long xrt_md_size(struct device *dev, const char *blob);
+int xrt_md_create(struct device *dev, char **blob);
+int xrt_md_add_endpoint(struct device *dev, char *blob,
+			struct xrt_md_endpoint *ep);
+int xrt_md_del_endpoint(struct device *dev, char *blob, const char *ep_name,
+			char *regmap_name);
+int xrt_md_get_prop(struct device *dev, const char *blob, const char *ep_name,
+		    const char *regmap_name, const char *prop,
+		    const void **val, int *size);
+int xrt_md_set_prop(struct device *dev, char *blob, const char *ep_name,
+		    const char *regmap_name, const char *prop,
+		    const void *val, int size);
+int xrt_md_copy_endpoint(struct device *dev, char *blob, const char *src_blob,
+			 const char *ep_name, const char *regmap_name,
+			 const char *new_ep_name);
+int xrt_md_get_next_endpoint(struct device *dev, const char *blob,
+			     const char *ep_name,  const char *regmap_name,
+			     char **next_ep, char **next_regmap);
+int xrt_md_get_compatible_endpoint(struct device *dev, const char *blob,
+				   const char *regmap_name, const char **ep_name);
+int xrt_md_find_endpoint(struct device *dev, const char *blob,
+			 const char *ep_name, const char *regmap_name,
+			 const char **epname);
+void xrt_md_pack(struct device *dev, char *blob);
+char *xrt_md_dup(struct device *dev, const char *blob);
+int xrt_md_get_intf_uuids(struct device *dev, const char *blob,
+			  u32 *num_uuids, uuid_t *intf_uuids);
+static inline int xrt_md_copy_all_endpoints(struct device *dev, char *blob, const char *src_blob)
+{
+	return xrt_md_copy_endpoint(dev, blob, src_blob, XRT_MD_NODE_ENDPOINTS,
+				    NULL, NULL);
+}
+
+/*
+ * Firmware provides 128 bit hash string as unque id of partition/interface.
+ * This string will be canonical textual representation in the future.
+ * Before that, introducing these two functions below to translate
+ * hash string to uuid_t for released hardware.
+ */
+static inline void xrt_md_trans_uuid2str(const uuid_t *uuid, char *uuidstr)
+{
+	int i, p;
+	u8 *u = (u8 *)uuid;
+
+	for (p = 0, i = sizeof(uuid_t) - 1; i >= 0; p++, i--)
+		(void)snprintf(&uuidstr[p * 2], 3, "%02x", u[i]);
+}
+
+static inline int xrt_md_trans_str2uuid(struct device *dev, const char *uuidstr, uuid_t *p_uuid)
+{
+	char *p;
+	const char *str;
+	char tmp[3] = { 0 };
+	int i, ret;
+
+	memset(p_uuid, 0, sizeof(*p_uuid));
+	p = (char *)p_uuid;
+	str = uuidstr + strlen(uuidstr) - 2;
+
+	for (i = 0; i < sizeof(*p_uuid) && str >= uuidstr; i++) {
+		tmp[0] = *str;
+		tmp[1] = *(str + 1);
+		ret = kstrtou8(tmp, 16, p);
+		if (ret)
+			return -EINVAL;
+		p++;
+		str -= 2;
+	}
+
+	return 0;
+}
+
+#endif
diff --git a/drivers/fpga/xrt/metadata/metadata.c b/drivers/fpga/xrt/metadata/metadata.c
new file mode 100644
index 000000000000..5d106396f438
--- /dev/null
+++ b/drivers/fpga/xrt/metadata/metadata.c
@@ -0,0 +1,524 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Alveo FPGA Metadata parse APIs
+ *
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ *      Lizhi Hou <Lizhi.Hou@xilinx.com>
+ */
+
+#include <linux/libfdt_env.h>
+#include "libfdt.h"
+#include "metadata.h"
+
+#define MAX_BLOB_SIZE	(4096 * 25)
+
+static int xrt_md_setprop(struct device *dev, char *blob, int offset,
+			  const char *prop, const void *val, int size);
+static int xrt_md_overlay(struct device *dev, char *blob, int target,
+			  const char *overlay_blob, int overlay_offset);
+static int xrt_md_get_endpoint(struct device *dev, const char *blob,
+			       const char *ep_name, const char *regmap_name,
+			       int *ep_offset);
+
+unsigned long xrt_md_size(struct device *dev, const char *blob)
+{
+	unsigned long len = (long)fdt_totalsize(blob);
+
+	len = (len > MAX_BLOB_SIZE) ? XRT_MD_INVALID_LENGTH : len;
+	return len;
+}
+EXPORT_SYMBOL_GPL(xrt_md_size);
+
+int xrt_md_create(struct device *dev, char **blob)
+{
+	int ret = 0;
+
+	WARN_ON(!blob);
+
+	*blob = vmalloc(MAX_BLOB_SIZE);
+	if (!*blob)
+		return -ENOMEM;
+
+	ret = fdt_create_empty_tree(*blob, MAX_BLOB_SIZE);
+	if (ret) {
+		dev_err(dev, "format blob failed, ret = %d", ret);
+		goto failed;
+	}
+
+	ret = fdt_next_node(*blob, -1, NULL);
+	if (ret < 0) {
+		dev_err(dev, "No Node, ret = %d", ret);
+		goto failed;
+	}
+
+	ret = fdt_add_subnode(*blob, ret, XRT_MD_NODE_ENDPOINTS);
+	if (ret < 0) {
+		dev_err(dev, "add node failed, ret = %d", ret);
+		goto failed;
+	}
+
+	return 0;
+
+failed:
+	vfree(*blob);
+	*blob = NULL;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(xrt_md_create);
+
+static int xrt_md_add_node(struct device *dev, char *blob, int parent_offset,
+			   const char *ep_name)
+{
+	int ret;
+
+	ret = fdt_add_subnode(blob, parent_offset, ep_name);
+	if (ret < 0 && ret != -FDT_ERR_EXISTS)
+		dev_err(dev, "failed to add node %s. %d", ep_name, ret);
+
+	return ret;
+}
+
+int xrt_md_del_endpoint(struct device *dev, char *blob, const char *ep_name,
+			char *regmap_name)
+{
+	int ret;
+	int ep_offset;
+
+	ret = xrt_md_get_endpoint(dev, blob, ep_name, regmap_name, &ep_offset);
+	if (ret) {
+		dev_err(dev, "can not find ep %s", ep_name);
+		return -EINVAL;
+	}
+
+	ret = fdt_del_node(blob, ep_offset);
+	if (ret)
+		dev_err(dev, "delete node %s failed, ret %d", ep_name, ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(xrt_md_del_endpoint);
+
+static int __xrt_md_add_endpoint(struct device *dev, char *blob,
+				 struct xrt_md_endpoint *ep, int *offset, bool root)
+{
+	int ret = 0;
+	int ep_offset = 0;
+	u32 val, count = 0;
+	u64 io_range[2];
+	char comp[128];
+
+	if (!ep->ep_name) {
+		dev_err(dev, "empty name");
+		return -EINVAL;
+	}
+
+	if (!root) {
+		ret = xrt_md_get_endpoint(dev, blob, XRT_MD_NODE_ENDPOINTS, NULL,
+					  &ep_offset);
+		if (ret) {
+			dev_err(dev, "invalid blob, ret = %d", ret);
+			return -EINVAL;
+		}
+	}
+
+	ep_offset = xrt_md_add_node(dev, blob, ep_offset, ep->ep_name);
+	if (ep_offset < 0) {
+		dev_err(dev, "add endpoint failed, ret = %d", ret);
+		return -EINVAL;
+	}
+	if (offset)
+		*offset = ep_offset;
+
+	if (ep->size != 0) {
+		val = cpu_to_be32(ep->bar);
+		ret = xrt_md_setprop(dev, blob, ep_offset, XRT_MD_PROP_BAR_IDX,
+				     &val, sizeof(u32));
+		if (ret) {
+			dev_err(dev, "set %s failed, ret %d",
+				XRT_MD_PROP_BAR_IDX, ret);
+			goto failed;
+		}
+		io_range[0] = cpu_to_be64((u64)ep->bar_off);
+		io_range[1] = cpu_to_be64((u64)ep->size);
+		ret = xrt_md_setprop(dev, blob, ep_offset, XRT_MD_PROP_IO_OFFSET,
+				     io_range, sizeof(io_range));
+		if (ret) {
+			dev_err(dev, "set %s failed, ret %d",
+				XRT_MD_PROP_IO_OFFSET, ret);
+			goto failed;
+		}
+	}
+
+	if (ep->regmap) {
+		if (ep->regmap_ver) {
+			count = snprintf(comp, sizeof(comp),
+					 "%s-%s", ep->regmap, ep->regmap_ver);
+			count++;
+		}
+
+		count += snprintf(comp + count, sizeof(comp) - count,
+				  "%s", ep->regmap);
+		count++;
+
+		ret = xrt_md_setprop(dev, blob, ep_offset, XRT_MD_PROP_COMPATIBLE,
+				     comp, count);
+		if (ret) {
+			dev_err(dev, "set %s failed, ret %d",
+				XRT_MD_PROP_COMPATIBLE, ret);
+			goto failed;
+		}
+	}
+
+failed:
+	if (ret)
+		xrt_md_del_endpoint(dev, blob, ep->ep_name, NULL);
+
+	return ret;
+}
+
+int xrt_md_add_endpoint(struct device *dev, char *blob,
+			struct xrt_md_endpoint *ep)
+{
+	return __xrt_md_add_endpoint(dev, blob, ep, NULL, false);
+}
+EXPORT_SYMBOL_GPL(xrt_md_add_endpoint);
+
+static int xrt_md_get_endpoint(struct device *dev, const char *blob,
+			       const char *ep_name, const char *regmap_name,
+			       int *ep_offset)
+{
+	int offset;
+	const char *name;
+
+	for (offset = fdt_next_node(blob, -1, NULL);
+	    offset >= 0;
+	    offset = fdt_next_node(blob, offset, NULL)) {
+		name = fdt_get_name(blob, offset, NULL);
+		if (!name || strncmp(name, ep_name, strlen(ep_name) + 1))
+			continue;
+		if (!regmap_name ||
+		    !fdt_node_check_compatible(blob, offset, regmap_name))
+			break;
+	}
+	if (offset < 0)
+		return -ENODEV;
+
+	*ep_offset = offset;
+
+	return 0;
+}
+
+int xrt_md_find_endpoint(struct device *dev, const char *blob,
+			 const char *ep_name, const char *regmap_name,
+			 const char **epname)
+{
+	int offset;
+	int ret;
+
+	ret = xrt_md_get_endpoint(dev, blob, ep_name, regmap_name,
+				  &offset);
+	if (!ret && epname && offset >= 0)
+		*epname = fdt_get_name(blob, offset, NULL);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(xrt_md_find_endpoint);
+
+int xrt_md_get_prop(struct device *dev, const char *blob, const char *ep_name,
+		    const char *regmap_name, const char *prop,
+		    const void **val, int *size)
+{
+	int offset;
+	int ret;
+
+	if (val)
+		*val = NULL;
+	if (ep_name) {
+		ret = xrt_md_get_endpoint(dev, blob, ep_name, regmap_name,
+					  &offset);
+		if (ret) {
+			dev_err(dev, "cannot get ep %s, regmap %s, ret = %d",
+				ep_name, regmap_name, ret);
+			return -EINVAL;
+		}
+	} else {
+		offset = fdt_next_node(blob, -1, NULL);
+		if (offset < 0) {
+			dev_err(dev, "internal error, ret = %d", offset);
+			return -EINVAL;
+		}
+	}
+
+	if (val) {
+		*val = fdt_getprop(blob, offset, prop, size);
+		if (!*val) {
+			dev_dbg(dev, "get ep %s, prop %s failed", ep_name, prop);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xrt_md_get_prop);
+
+static int xrt_md_setprop(struct device *dev, char *blob, int offset,
+			  const char *prop, const void *val, int size)
+{
+	int ret;
+
+	ret = fdt_setprop(blob, offset, prop, val, size);
+	if (ret)
+		dev_err(dev, "failed to set prop %d", ret);
+
+	return ret;
+}
+
+int xrt_md_set_prop(struct device *dev, char *blob,
+		    const char *ep_name, const char *regmap_name,
+		    const char *prop, const void *val, int size)
+{
+	int offset;
+	int ret;
+
+	if (ep_name) {
+		ret = xrt_md_get_endpoint(dev, blob, ep_name,
+					  regmap_name, &offset);
+		if (ret) {
+			dev_err(dev, "cannot get node %s, ret = %d",
+				ep_name, ret);
+			return -EINVAL;
+		}
+	} else {
+		offset = fdt_next_node(blob, -1, NULL);
+		if (offset < 0) {
+			dev_err(dev, "internal error, ret = %d", offset);
+			return -EINVAL;
+		}
+	}
+
+	ret = xrt_md_setprop(dev, blob, offset, prop, val, size);
+	if (ret)
+		dev_err(dev, "set prop %s failed, ret = %d", prop, ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(xrt_md_set_prop);
+
+int xrt_md_copy_endpoint(struct device *dev, char *blob, const char *src_blob,
+			 const char *ep_name, const char *regmap_name,
+			 const char *new_ep_name)
+{
+	int offset, target;
+	int ret;
+	struct xrt_md_endpoint ep = {0};
+	const char *newepnm = new_ep_name ? new_ep_name : ep_name;
+
+	ret = xrt_md_get_endpoint(dev, src_blob, ep_name, regmap_name,
+				  &offset);
+	if (ret)
+		return -EINVAL;
+
+	ret = xrt_md_get_endpoint(dev, blob, newepnm, regmap_name, &target);
+	if (ret) {
+		ep.ep_name = newepnm;
+		ret = __xrt_md_add_endpoint(dev, blob, &ep, &target,
+					    fdt_parent_offset(src_blob, offset) == 0);
+		if (ret)
+			return -EINVAL;
+	}
+
+	ret = xrt_md_overlay(dev, blob, target, src_blob, offset);
+	if (ret)
+		dev_err(dev, "overlay failed, ret = %d", ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(xrt_md_copy_endpoint);
+
+char *xrt_md_dup(struct device *dev, const char *blob)
+{
+	int ret;
+	char *dup_blob;
+
+	ret = xrt_md_create(dev, &dup_blob);
+	if (ret)
+		return NULL;
+	ret = xrt_md_overlay(dev, dup_blob, -1, blob, -1);
+	if (ret) {
+		vfree(dup_blob);
+		return NULL;
+	}
+
+	return dup_blob;
+}
+EXPORT_SYMBOL_GPL(xrt_md_dup);
+
+static int xrt_md_overlay(struct device *dev, char *blob, int target,
+			  const char *overlay_blob, int overlay_offset)
+{
+	int	property, subnode;
+	int	ret;
+
+	WARN_ON(!blob || !overlay_blob);
+
+	if (!blob) {
+		dev_err(dev, "blob is NULL");
+		return -EINVAL;
+	}
+
+	if (target < 0) {
+		target = fdt_next_node(blob, -1, NULL);
+		if (target < 0) {
+			dev_err(dev, "invalid target");
+			return -EINVAL;
+		}
+	}
+	if (overlay_offset < 0) {
+		overlay_offset = fdt_next_node(overlay_blob, -1, NULL);
+		if (overlay_offset < 0) {
+			dev_err(dev, "invalid overlay");
+			return -EINVAL;
+		}
+	}
+
+	fdt_for_each_property_offset(property, overlay_blob, overlay_offset) {
+		const char *name;
+		const void *prop;
+		int prop_len;
+
+		prop = fdt_getprop_by_offset(overlay_blob, property, &name,
+					     &prop_len);
+		if (!prop || prop_len >= MAX_BLOB_SIZE) {
+			dev_err(dev, "internal error");
+			return -EINVAL;
+		}
+
+		ret = xrt_md_setprop(dev, blob, target, name, prop,
+				     prop_len);
+		if (ret) {
+			dev_err(dev, "setprop failed, ret = %d", ret);
+			return ret;
+		}
+	}
+
+	fdt_for_each_subnode(subnode, overlay_blob, overlay_offset) {
+		const char *name = fdt_get_name(overlay_blob, subnode, NULL);
+		int nnode;
+
+		nnode = xrt_md_add_node(dev, blob, target, name);
+		if (nnode == -FDT_ERR_EXISTS)
+			nnode = fdt_subnode_offset(blob, target, name);
+		if (nnode < 0) {
+			dev_err(dev, "add node failed, ret = %d", nnode);
+			return nnode;
+		}
+
+		ret = xrt_md_overlay(dev, blob, nnode, overlay_blob, subnode);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+int xrt_md_get_next_endpoint(struct device *dev, const char *blob,
+			     const char *ep_name, const char *regmap_name,
+			     char **next_ep, char **next_regmap)
+{
+	int offset, ret;
+
+	if (!ep_name) {
+		ret = xrt_md_get_endpoint(dev, blob, XRT_MD_NODE_ENDPOINTS, NULL,
+					  &offset);
+	} else {
+		ret = xrt_md_get_endpoint(dev, blob, ep_name, regmap_name,
+					  &offset);
+	}
+
+	if (ret) {
+		*next_ep = NULL;
+		*next_regmap = NULL;
+		return -EINVAL;
+	}
+
+	offset = ep_name ? fdt_next_subnode(blob, offset) :
+		fdt_first_subnode(blob, offset);
+	if (offset < 0) {
+		*next_ep = NULL;
+		*next_regmap = NULL;
+		return -EINVAL;
+	}
+
+	*next_ep = (char *)fdt_get_name(blob, offset, NULL);
+	*next_regmap = (char *)fdt_stringlist_get(blob, offset, XRT_MD_PROP_COMPATIBLE,
+						  0, NULL);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xrt_md_get_next_endpoint);
+
+int xrt_md_get_compatible_endpoint(struct device *dev, const char *blob,
+				   const char *regmap_name, const char **ep_name)
+{
+	int ep_offset;
+
+	ep_offset = fdt_node_offset_by_compatible(blob, -1, regmap_name);
+	if (ep_offset < 0) {
+		*ep_name = NULL;
+		return -ENOENT;
+	}
+
+	*ep_name = (char *)fdt_get_name(blob, ep_offset, NULL);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xrt_md_get_compatible_endpoint);
+
+void xrt_md_pack(struct device *dev, char *blob)
+{
+	int ret;
+
+	ret = fdt_pack(blob);
+	if (ret)
+		dev_err(dev, "pack failed %d", ret);
+}
+EXPORT_SYMBOL_GPL(xrt_md_pack);
+
+int xrt_md_get_intf_uuids(struct device *dev, const char *blob,
+			  u32 *num_uuids, uuid_t *intf_uuids)
+{
+	int offset, count = 0;
+	int ret;
+	const char *uuid_str;
+
+	ret = xrt_md_get_endpoint(dev, blob, XRT_MD_NODE_INTERFACES, NULL, &offset);
+	if (ret)
+		return -ENOENT;
+
+	for (offset = fdt_first_subnode(blob, offset);
+	    offset >= 0;
+	    offset = fdt_next_subnode(blob, offset)) {
+		uuid_str = fdt_getprop(blob, offset, XRT_MD_PROP_INTERFACE_UUID,
+				       NULL);
+		if (!uuid_str) {
+			dev_err(dev, "empty intf uuid node");
+			return -EINVAL;
+		}
+
+		if (intf_uuids && count < *num_uuids) {
+			ret = xrt_md_trans_str2uuid(dev, uuid_str,
+						    &intf_uuids[count]);
+			if (ret)
+				return -EINVAL;
+		}
+		count++;
+	}
+
+	*num_uuids = count;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xrt_md_get_intf_uuids);
-- 
2.18.4