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SubjectRe: [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@intel.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@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>
> ---
> 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@vger.kernel.org>
> 0xB5 00-0F uapi/linux/rpmsg.h <mailto:linux-remoteproc@vger.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@intel.com>
> + * Zhang Yi <yi.z.zhang@intel.com>
> + * Wu Hao <hao.wu@intel.com>
> + * Xiao Guangrong <guangrong.xiao@linux.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
>

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