Commit 620e1902 authored by Wu Hao's avatar Wu Hao Committed by Greg Kroah-Hartman
Browse files

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: default avatarTim Whisonant <tim.whisonant@intel.com>
Signed-off-by: default avatarEnno Luebbers <enno.luebbers@intel.com>
Signed-off-by: default avatarShiva Rao <shiva.rao@intel.com>
Signed-off-by: default avatarChristopher Rauer <christopher.rauer@intel.com>
Signed-off-by: default avatarXiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: default avatarWu Hao <hao.wu@intel.com>
Acked-by: default avatarAlan Tull <atull@kernel.org>
Acked-by: default avatarMoritz Fischer <mdf@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0a27ff24

Documentation/ioctl/ioctl-number.txt

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/fpga/dfl-fme-main.c

+12 −0
Original line number Diff line number Diff line
@@ -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.

include/uapi/linux/fpga-dfl.h

0 → 100644
+50 −0
Original line number Diff line number Diff line 
/* 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 */

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