need to be supported by all feature devices drivers including FME and AFU.
Userspace application can use these ioctl interfaces to get the API info
and check if specific extension is supported or not in current driver.

This patch implements above 2 ioctls in FPGA Management Engine (FME)
driver.

Signed-off-by: Tim Whisonant <redacted>
Signed-off-by: Enno Luebbers <redacted>
Signed-off-by: Shiva Rao <redacted>
Signed-off-by: Christopher Rauer <redacted>
Signed-off-by: Xiao Guangrong <redacted>
Signed-off-by: Wu Hao <redacted>
Acked-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
---
v2: switched to GPLv2 license.
v3: rename intel-fpga.h to fpga-dfl.h and rebased.
v4: fix SPDX license issue.
    add Acked-by from Alan and Moritz.
---
 Documentation/ioctl/ioctl-number.txt |  1 +
 drivers/fpga/dfl-fme-main.c          | 12 +++++++++
 include/uapi/linux/fpga-dfl.h        | 48 ++++++++++++++++++++++++++++++++++++
 3 files changed, 61 insertions(+)
 create mode 100644 include/uapi/linux/fpga-dfl.h

diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
index 6501389..f1e7baa 100644
--- a/Documentation/ioctl/ioctl-number.txt
+++ b/Documentation/ioctl/ioctl-number.txt

@@ -324,6 +324,7 @@ Code  Seq#(hex)     Include File            Comments
 0xB3   00      linux/mmc/ioctl.h
 0xB4   00-0F   linux/gpio.h            <mailto:linux-gpio@vger.kernel.org>
 0xB5   00-0F   uapi/linux/rpmsg.h      <mailto:linux-remoteproc@vger.kernel.org>
+0xB6   all     linux/fpga-dfl.h
 0xC0   00-0F   linux/usb/iowarrior.h
 0xCA   00-0F   uapi/misc/cxl.h
 0xCA   10-2F   uapi/misc/ocxl.h

diff --git a/drivers/fpga/dfl-fme-main.c b/drivers/fpga/dfl-fme-main.c
index 056ae24..1a9929c 100644
--- a/drivers/fpga/dfl-fme-main.c
+++ b/drivers/fpga/dfl-fme-main.c

@@ -16,6 +16,7 @@

 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/fpga-dfl.h>

 #include "dfl.h"

@@ -114,6 +115,13 @@ static struct feature_driver fme_feature_drvs[] = {
        },
 };

+static long fme_ioctl_check_extension(struct feature_platform_data *pdata,
+                                     unsigned long arg)
+{
+       /* No extension support for now */
+       return 0;
+}
+
 static int fme_open(struct inode *inode, struct file *filp)
 {
        struct platform_device *fdev = fpga_inode_to_feature_dev(inode);

@@ -154,6 +162,10 @@ static long fme_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
        dev_dbg(&pdev->dev, "%s cmd 0x%x\n", __func__, cmd);

        switch (cmd) {
+       case FPGA_GET_API_VERSION:
+               return FPGA_API_VERSION;
+       case FPGA_CHECK_EXTENSION:
+               return fme_ioctl_check_extension(pdata, arg);
        default:
                /*
                 * Let sub-feature's ioctl function to handle the cmd

diff --git a/include/uapi/linux/fpga-dfl.h b/include/uapi/linux/fpga-dfl.h
new file mode 100644
index 0000000..9321ee9
--- /dev/null
+++ b/include/uapi/linux/fpga-dfl.h

@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Header File for FPGA DFL User API
+ *
+ * Copyright (C) 2017 Intel Corporation, Inc.
+ *
+ * Authors:
+ *   Kang Luwei <luwei.kang@intel.com>
+ *   Zhang Yi <yi.z.zhang@intel.com>
+ *   Wu Hao <hao.wu@intel.com>
+ *   Xiao Guangrong <guangrong.xiao@linux.intel.com>
+ */
+
+#ifndef _UAPI_LINUX_FPGA_DFL_H
+#define _UAPI_LINUX_FPGA_DFL_H
+
+#define FPGA_API_VERSION 0