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Date:   Thu, 5 Apr 2018 13:35:24 -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 v4 10/24] fpga: dfl: add FPGA Management Engine driver
 basic framework

On Tue, Feb 13, 2018 at 3:24 AM, Wu Hao <hao.wu@...el.com> wrote:

Hi Hao,

> From: Kang Luwei <luwei.kang@...el.com>
>
> The FPGA Management Engine (FME) provides power, thermal management,
> performance counters, partial reconfiguration and other functions. For each
> function, it is packaged into a private feature linked to the FME feature
> device in the 'Device Feature List'. It's a platform device created by
> DFL framework.
>
> This patch adds the basic framework of FME platform driver. It defines
> sub feature drivers to handle the different sub features, including init,
> uinit and ioctl. It also registers the file operations for the device file.
>
> 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: Kang Luwei <luwei.kang@...el.com>
> Signed-off-by: Xiao Guangrong <guangrong.xiao@...ux.intel.com>
> Signed-off-by: Wu Hao <hao.wu@...el.com>
> ---
> v3: rename driver from intel-fpga-fme to dfl-fme
>     rename Kconfig from INTEL_FPGA_FME to FPGA_DFL_FME
> v4: fix SPDX license issue, use dfl-fme as module name
> ---
>  drivers/fpga/Kconfig        |  10 +++
>  drivers/fpga/Makefile       |   3 +
>  drivers/fpga/dfl-fme-main.c | 158 ++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 171 insertions(+)
>  create mode 100644 drivers/fpga/dfl-fme-main.c
>
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index 87f3d44..103d5e2 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -140,6 +140,16 @@ config FPGA_DFL
>           Gate Array (FPGA) solutions which implement Device Feature List.
>           It provides enumeration APIs, and feature device infrastructure.
>
> +config FPGA_DFL_FME
> +       tristate "FPGA DFL FME Driver"
> +       depends on FPGA_DFL
> +       help
> +         The FPGA Management Engine (FME) is a feature device implemented
> +         under Device Feature List (DFL) framework. Select this option to
> +         enable the platform device driver for FME which implements all
> +         FPGA platform level management features. There shall be 1 FME
> +         per DFL based FPGA device.
> +
>  config FPGA_DFL_PCI
>         tristate "FPGA Device Feature List (DFL) PCIe Device Driver"
>         depends on PCI && FPGA_DFL
> diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
> index 4375630..fbd1c85 100644
> --- a/drivers/fpga/Makefile
> +++ b/drivers/fpga/Makefile
> @@ -30,6 +30,9 @@ obj-$(CONFIG_OF_FPGA_REGION)          += of-fpga-region.o
>
>  # FPGA Device Feature List Support
>  obj-$(CONFIG_FPGA_DFL)                 += dfl.o
> +obj-$(CONFIG_FPGA_DFL_FME)             += dfl-fme.o
> +
> +dfl-fme-objs := dfl-fme-main.o
>
>  # Drivers for FPGAs which implement DFL
>  obj-$(CONFIG_FPGA_DFL_PCI)             += dfl-pci.o
> diff --git a/drivers/fpga/dfl-fme-main.c b/drivers/fpga/dfl-fme-main.c
> new file mode 100644
> index 0000000..ebe6b52
> --- /dev/null
> +++ b/drivers/fpga/dfl-fme-main.c
> @@ -0,0 +1,158 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Driver for FPGA Management Engine (FME)
> + *
> + * Copyright (C) 2017 Intel Corporation, Inc.
> + *
> + * Authors:
> + *   Kang Luwei <luwei.kang@...el.com>
> + *   Xiao Guangrong <guangrong.xiao@...ux.intel.com>
> + *   Joseph Grecco <joe.grecco@...el.com>
> + *   Enno Luebbers <enno.luebbers@...el.com>
> + *   Tim Whisonant <tim.whisonant@...el.com>
> + *   Ananda Ravuri <ananda.ravuri@...el.com>
> + *   Henry Mitchel <henry.mitchel@...el.com>
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +
> +#include "dfl.h"
> +
> +static int fme_hdr_init(struct platform_device *pdev, struct feature *feature)
> +{
> +       dev_dbg(&pdev->dev, "FME HDR Init.\n");
> +
> +       return 0;
> +}
> +
> +static void fme_hdr_uinit(struct platform_device *pdev, struct feature *feature)
> +{
> +       dev_dbg(&pdev->dev, "FME HDR UInit.\n");
> +}
> +
> +static const struct feature_ops fme_hdr_ops = {
> +       .init = fme_hdr_init,
> +       .uinit = fme_hdr_uinit,
> +};
> +
> +static struct feature_driver fme_feature_drvs[] = {
> +       {
> +               .id = FME_FEATURE_ID_HEADER,
> +               .ops = &fme_hdr_ops,
> +       },
> +       {
> +               .ops = NULL,
> +       },
> +};
> +
> +static int fme_open(struct inode *inode, struct file *filp)
> +{
> +       struct platform_device *fdev = fpga_inode_to_feature_dev(inode);
> +       struct feature_platform_data *pdata = dev_get_platdata(&fdev->dev);
> +       int ret;
> +
> +       if (WARN_ON(!pdata))
> +               return -ENODEV;
> +
> +       ret = feature_dev_use_begin(pdata);
> +       if (ret)
> +               return ret;
> +
> +       dev_dbg(&fdev->dev, "Device File Open\n");
> +       filp->private_data = pdata;
> +
> +       return 0;
> +}
> +
> +static int fme_release(struct inode *inode, struct file *filp)
> +{
> +       struct feature_platform_data *pdata = filp->private_data;
> +       struct platform_device *pdev = pdata->dev;
> +
> +       dev_dbg(&pdev->dev, "Device File Release\n");
> +       feature_dev_use_end(pdata);
> +
> +       return 0;
> +}
> +
> +static long fme_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> +{
> +       struct feature_platform_data *pdata = filp->private_data;
> +       struct platform_device *pdev = pdata->dev;
> +       struct feature *f;
> +       long ret;
> +
> +       dev_dbg(&pdev->dev, "%s cmd 0x%x\n", __func__, cmd);
> +
> +       switch (cmd) {
> +       default:
> +               /*
> +                * Let sub-feature's ioctl function to handle the cmd
> +                * Sub-feature's ioctl returns -ENODEV when cmd is not
> +                * handled in this sub feature, and returns 0 and other
> +                * error code if cmd is handled.
> +                */
> +               fpga_dev_for_each_feature(pdata, f) {
> +                       if (f->ops && f->ops->ioctl) {
> +                               ret = f->ops->ioctl(pdev, f, cmd, arg);
> +                               if (ret == -ENODEV)
> +                                       continue;
> +                               else
> +                                       return ret;

continue and else aren't needed.  Could be

if (ret != -ENODEV)
        return ret;

Alan

> +                       }
> +               }
> +       }
> +
> +       return -EINVAL;
> +}
> +
> +static const struct file_operations fme_fops = {
> +       .owner          = THIS_MODULE,
> +       .open           = fme_open,
> +       .release        = fme_release,
> +       .unlocked_ioctl = fme_ioctl,
> +};
> +
> +static int fme_probe(struct platform_device *pdev)
> +{
> +       int ret;
> +
> +       ret = fpga_dev_feature_init(pdev, fme_feature_drvs);
> +       if (ret)
> +               goto exit;
> +
> +       ret = fpga_register_dev_ops(pdev, &fme_fops, THIS_MODULE);
> +       if (ret)
> +               goto feature_uinit;
> +
> +       return 0;
> +
> +feature_uinit:
> +       fpga_dev_feature_uinit(pdev);
> +exit:
> +       return ret;
> +}
> +
> +static int fme_remove(struct platform_device *pdev)
> +{
> +       fpga_dev_feature_uinit(pdev);
> +       fpga_unregister_dev_ops(pdev);
> +
> +       return 0;
> +}
> +
> +static struct platform_driver fme_driver = {
> +       .driver = {
> +               .name    = FPGA_FEATURE_DEV_FME,
> +       },
> +       .probe   = fme_probe,
> +       .remove  = fme_remove,
> +};
> +
> +module_platform_driver(fme_driver);
> +
> +MODULE_DESCRIPTION("FPGA Management Engine driver");
> +MODULE_AUTHOR("Intel Corporation");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:dfl-fme");
> --
> 2.7.4
>

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