linux-kernel - Re: [PATCH v2 13/22] fpga: intel: fme: add FPGA_GET_API_VERSION/CHECK

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Message-ID: <CANk1AXTAZL7nJp_5q_WHrG9DDze+-Tm+Z66M7TnR24qX34=i5A@mail.gmail.com>
Date:   Thu, 17 Aug 2017 14:11:26 -0500
From:   Alan Tull <atull@...nel.org>
To:     Wu Hao <hao.wu@...el.com>
Cc:     Moritz Fischer <mdf@...nel.org>, linux-fpga@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-api@...r.kernel.org, "Kang, Luwei" <luwei.kang@...el.com>,
        "Zhang, Yi Z" <yi.z.zhang@...el.com>,
        Tim Whisonant <tim.whisonant@...el.com>,
        Enno Luebbers <enno.luebbers@...el.com>,
        Shiva Rao <shiva.rao@...el.com>,
        Christopher Rauer <christopher.rauer@...el.com>,
        Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Subject: Re: [PATCH v2 13/22] fpga: intel: fme: add FPGA_GET_API_VERSION/CHECK_EXTENSION
 ioctls support

On Sun, Jun 25, 2017 at 8:52 PM, Wu Hao <hao.wu@...el.com> wrote:
> FPGA_GET_API_VERSION and 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 Intel FPGA Management Engine (FME)
> driver.
>
> Signed-off-by: Tim Whisonant <tim.whisonant@...el.com>
> Signed-off-by: Enno Luebbers <enno.luebbers@...el.com>
> Signed-off-by: Shiva Rao <shiva.rao@...el.com>
> Signed-off-by: Christopher Rauer <christopher.rauer@...el.com>
> Signed-off-by: Xiao Guangrong <guangrong.xiao@...ux.intel.com>
> Signed-off-by: Wu Hao <hao.wu@...el.com>
Acked-by: Alan Tull <atull@...nel.org>
> ---
> v2: switched to GPLv2 license.
> ---
>  Documentation/ioctl/ioctl-number.txt |  1 +
>  drivers/fpga/intel-fme-main.c        | 12 +++++++++
>  include/uapi/linux/intel-fpga.h      | 50 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 63 insertions(+)
>  create mode 100644 include/uapi/linux/intel-fpga.h
>
> diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
> index 1e9fcb4..a0d8be5 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@...r.kernel.org>
>  0xB5   00-0F   uapi/linux/rpmsg.h      <mailto:linux-remoteproc@...r.kernel.org>
> +0xB6   all     linux/intel-fpga.h
>  0xC0   00-0F   linux/usb/iowarrior.h
>  0xCA   00-0F   uapi/misc/cxl.h
>  0xCA   80-8F   uapi/scsi/cxlflash_ioctl.h
> diff --git a/drivers/fpga/intel-fme-main.c b/drivers/fpga/intel-fme-main.c
> index dfbb17c..9fd0baf 100644
> --- a/drivers/fpga/intel-fme-main.c
> +++ b/drivers/fpga/intel-fme-main.c
> @@ -18,6 +18,7 @@
>
>  #include <linux/kernel.h>
>  #include <linux/module.h>
> +#include <linux/intel-fpga.h>
>
>  #include "intel-feature-dev.h"
>
> @@ -102,6 +103,13 @@ struct feature_ops fme_hdr_ops = {
>         },
>  };
>
> +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);
> @@ -140,6 +148,10 @@ 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/intel-fpga.h b/include/uapi/linux/intel-fpga.h
> new file mode 100644
> index 0000000..e340ef9
> --- /dev/null
> +++ b/include/uapi/linux/intel-fpga.h
> @@ -0,0 +1,50 @@
> +/*
> + * Header File for Intel FPGA User API
> + *
> + * Copyright (C) 2017 Intel Corporation, Inc.
> + *
> + * Authors:
> + *   Kang Luwei <luwei.kang@...el.com>
> + *   Zhang Yi <yi.z.zhang@...el.com>
> + *   Wu Hao <hao.wu@...el.com>
> + *   Xiao Guangrong <guangrong.xiao@...ux.intel.com>
> + *
> + * This work is licensed under the terms of the GNU GPL version 2. See
> + * the COPYING file in the top-level directory.
> + */
> +
> +#ifndef _UAPI_LINUX_INTEL_FPGA_H
> +#define _UAPI_LINUX_INTEL_FPGA_H
> +
> +#define FPGA_API_VERSION 0
> +
> +/*
> + * The IOCTL interface for Intel 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 FPGA_MAGIC 0xB6
> +
> +#define FPGA_BASE 0
> +
> +/**
> + * FPGA_GET_API_VERSION - _IO(FPGA_MAGIC, FPGA_BASE + 0)
> + *
> + * Report the version of the driver API.
> + * Return: Driver API Version.
> + */
> +
> +#define FPGA_GET_API_VERSION   _IO(FPGA_MAGIC, FPGA_BASE + 0)
> +
> +/**
> + * FPGA_CHECK_EXTENSION - _IO(FPGA_MAGIC, FPGA_BASE + 1)
> + *
> + * Check whether an extension is supported.
> + * Return: 0 if not supported, otherwise the extension is supported.
> + */
> +
> +#define FPGA_CHECK_EXTENSION   _IO(FPGA_MAGIC, FPGA_BASE + 1)
> +
> +#endif /* _UAPI_INTEL_FPGA_H */
> --
> 1.8.3.1
>