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Date:   Thu, 5 Apr 2018 13:26:57 -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 20/24] fpga: dfl: add FPGA Accelerated Function Unit
 driver basic framework

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

Hi Hao,

One minor thing below.

> On DFL FPGA devices, the Accelerated Function Unit (AFU), can be
> reprogrammed for different functions. It connects to the FPGA
> infrastructure("blue bistream") via a Port. Port CSRs are implemented
> separately from the AFU CSRs to provide control and status of the Port.
> Once valid green bitstream is programmed into the AFU, it allows access
> to the AFU CSRs in the AFU MMIO space.
>
> This patch only implements basic driver framework for AFU, including
> device file operation framework.
>
> 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>
> ---
> v3: rename driver to dfl-afu-main.c
> v4: rename to dfl-port and fix SPDX license issue.
> ---
>  drivers/fpga/Kconfig        |   9 +++
>  drivers/fpga/Makefile       |   2 +
>  drivers/fpga/dfl-afu-main.c | 159 ++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 170 insertions(+)
>  create mode 100644 drivers/fpga/dfl-afu-main.c
>
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index 65d54a4..4c6b45f 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -168,6 +168,15 @@ config FPGA_DFL_FME_REGION
>         help
>           Say Y to enable FPGA Region driver for FPGA Management Engine.
>
> +config FPGA_DFL_AFU
> +       tristate "FPGA DFL AFU Driver"
> +       depends on FPGA_DFL
> +       help
> +         This is the driver for FPGA Accelerated Function Unit (AFU) which
> +         implements AFU and Port management features. A User AFU connects
> +         to the FPGA infrastructure via a Port. There may be more than 1
> +         Port/AFU 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 163894e..5c9607b 100644
> --- a/drivers/fpga/Makefile
> +++ b/drivers/fpga/Makefile
> @@ -34,8 +34,10 @@ obj-$(CONFIG_FPGA_DFL_FME)           += dfl-fme.o
>  obj-$(CONFIG_FPGA_DFL_FME_MGR)         += dfl-fme-mgr.o
>  obj-$(CONFIG_FPGA_DFL_FME_BRIDGE)      += dfl-fme-br.o
>  obj-$(CONFIG_FPGA_DFL_FME_REGION)      += dfl-fme-region.o
> +obj-$(CONFIG_FPGA_DFL_AFU)             += dfl-afu.o
>
>  dfl-fme-objs := dfl-fme-main.o dfl-fme-pr.o
> +dfl-afu-objs := dfl-afu-main.o
>
>  # Drivers for FPGAs which implement DFL
>  obj-$(CONFIG_FPGA_DFL_PCI)             += dfl-pci.o
> diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
> new file mode 100644
> index 0000000..70db28c
> --- /dev/null
> +++ b/drivers/fpga/dfl-afu-main.c
> @@ -0,0 +1,159 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Driver for FPGA Accelerated Function Unit (AFU)
> + *
> + * Copyright (C) 2017 Intel Corporation, Inc.
> + *
> + * Authors:
> + *   Wu Hao <hao.wu@...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 port_hdr_init(struct platform_device *pdev, struct feature *feature)
> +{
> +       dev_dbg(&pdev->dev, "PORT HDR Init.\n");
> +
> +       return 0;
> +}
> +
> +static void port_hdr_uinit(struct platform_device *pdev,
> +                          struct feature *feature)
> +{
> +       dev_dbg(&pdev->dev, "PORT HDR UInit.\n");
> +}
> +
> +static const struct feature_ops port_hdr_ops = {
> +       .init = port_hdr_init,
> +       .uinit = port_hdr_uinit,
> +};
> +
> +static struct feature_driver port_feature_drvs[] = {
> +       {
> +               .id = PORT_FEATURE_ID_HEADER,
> +               .ops = &port_hdr_ops,
> +       },
> +       {
> +               .ops = NULL,
> +       }
> +};
> +
> +static int afu_open(struct inode *inode, struct file *filp)
> +{
> +       struct platform_device *fdev = fpga_inode_to_feature_dev(inode);
> +       struct feature_platform_data *pdata;
> +       int ret;
> +
> +       pdata = dev_get_platdata(&fdev->dev);
> +       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 = fdev;
> +
> +       return 0;
> +}
> +
> +static int afu_release(struct inode *inode, struct file *filp)
> +{
> +       struct platform_device *pdev = filp->private_data;
> +       struct feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
> +
> +       dev_dbg(&pdev->dev, "Device File Release\n");
> +
> +       feature_dev_use_end(pdata);
> +
> +       return 0;
> +}
> +
> +static long afu_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> +{
> +       struct platform_device *pdev = filp->private_data;
> +       struct feature_platform_data *pdata = dev_get_platdata(&pdev->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;

The continue..else isn't needed.  Could just be
if (ret != -ENODEV)
        return ret;

Thanks,
Alan

> +                       }
> +       }
> +
> +       return -EINVAL;
> +}
> +
> +static const struct file_operations afu_fops = {
> +       .owner = THIS_MODULE,
> +       .open = afu_open,
> +       .release = afu_release,
> +       .unlocked_ioctl = afu_ioctl,
> +};
> +
> +static int afu_probe(struct platform_device *pdev)
> +{
> +       int ret;
> +
> +       dev_dbg(&pdev->dev, "%s\n", __func__);
> +
> +       ret = fpga_dev_feature_init(pdev, port_feature_drvs);
> +       if (ret)
> +               return ret;
> +
> +       ret = fpga_register_dev_ops(pdev, &afu_fops, THIS_MODULE);
> +       if (ret)
> +               fpga_dev_feature_uinit(pdev);
> +
> +       return ret;
> +}
> +
> +static int afu_remove(struct platform_device *pdev)
> +{
> +       dev_dbg(&pdev->dev, "%s\n", __func__);
> +
> +       fpga_dev_feature_uinit(pdev);
> +       fpga_unregister_dev_ops(pdev);
> +
> +       return 0;
> +}
> +
> +static struct platform_driver afu_driver = {
> +       .driver = {
> +               .name    = FPGA_FEATURE_DEV_PORT,
> +       },
> +       .probe   = afu_probe,
> +       .remove  = afu_remove,
> +};
> +
> +module_platform_driver(afu_driver);
> +
> +MODULE_DESCRIPTION("FPGA Accelerated Function Unit driver");
> +MODULE_AUTHOR("Intel Corporation");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:dfl-port");
> --
> 2.7.4
>

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