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

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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>
This commit is contained in:
Wu Hao 2018-06-30 08:53:23 +08:00 committed by Greg Kroah-Hartman
parent 0a27ff24d5
commit 620e1902f6
3 changed files with 63 additions and 0 deletions
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1
Documentation/ioctl/ioctl-number.txt
View File

@ -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

12
drivers/fpga/dfl-fme-main.c
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@ -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.

50
include/uapi/linux/fpga-dfl.h Normal file
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@ -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 */