fpga: dfl: fme: add DFL_FPGA_GET_API_VERSION/CHECK_EXTENSION ioctls support

DFL_FPGA_GET_API_VERSION and DFL_FPGA_CHECK_EXTENSION ioctls are common
ones which 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 <tim.whisonant@intel.com>
Signed-off-by: Enno Luebbers <enno.luebbers@intel.com>
Signed-off-by: Shiva Rao <shiva.rao@intel.com>
Signed-off-by: Christopher Rauer <christopher.rauer@intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
Acked-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
index 480c8609dc58277ba11fdde5d9e5975fea98c718..db9afea24299eb2c65620d1b1138c028bc2186cd 100644 (file)
--- a/Documentation/ioctl/ioctl-number.txt
+++ b/Documentation/ioctl/ioctl-number.txt
@@ -322,6 +322,7 @@ 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 c23c56fe3f4b1525754db8e5ee0c47b9092fe58f..c83ff88e3bbbfdcd15c0a4b6fa61de335edcb3c2 100644 (file)
--- 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"
 
@@ -116,6 +117,13 @@ static struct dfl_feature_driver fme_feature_drvs[] = {
        },
 };
 
+static long fme_ioctl_check_extension(struct dfl_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 = dfl_fpga_inode_to_feature_dev(inode);
@@ -156,6 +164,10 @@ 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 DFL_FPGA_GET_API_VERSION:
+               return DFL_FPGA_API_VERSION;
+       case DFL_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 (file)
index 0000000..858e443
--- /dev/null
+++ b/include/uapi/linux/fpga-dfl.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Header File for FPGA DFL User API
+ *
+ * Copyright (C) 2017-2018 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
+
+#include <linux/ioctl.h>
+
+#define DFL_FPGA_API_VERSION 0
+
+/*
+ * The IOCTL interface for DFL based FPGA is designed for extensibility by
+ * embedding the structure length (argsz) and flags into structures passed
+ * between kernel and userspace. This design referenced the VFIO IOCTL
+ * interface (include/uapi/linux/vfio.h).
+ */
+
+#define DFL_FPGA_MAGIC 0xB6
+
+#define DFL_FPGA_BASE 0
+
+/**
+ * DFL_FPGA_GET_API_VERSION - _IO(DFL_FPGA_MAGIC, DFL_FPGA_BASE + 0)
+ *
+ * Report the version of the driver API.
+ * Return: Driver API Version.
+ */
+
+#define DFL_FPGA_GET_API_VERSION       _IO(DFL_FPGA_MAGIC, DFL_FPGA_BASE + 0)
+
+/**
+ * DFL_FPGA_CHECK_EXTENSION - _IO(DFL_FPGA_MAGIC, DFL_FPGA_BASE + 1)
+ *
+ * Check whether an extension is supported.
+ * Return: 0 if not supported, otherwise the extension is supported.
+ */
+
+#define DFL_FPGA_CHECK_EXTENSION       _IO(DFL_FPGA_MAGIC, DFL_FPGA_BASE + 1)
+
+#endif /* _UAPI_LINUX_FPGA_DFL_H */