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SubjectRe: [PATCH v2 17/22] fpga: intel: add fpga region platform driver for FME
On Sun, Jun 25, 2017 at 8:52 PM, Wu Hao <hao.wu@intel.com> wrote:

Hi Hao,

Thanks for using the region patchset. This looks good except for one
thing below.

> This patch adds fpga region platform driver for Intel FPGA Management
> Engine. It register a fpga region with given fpga manager / bridge
> device.
>
> 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: Wu Hao <hao.wu@intel.com>
> ---
> drivers/fpga/Kconfig | 7 +++
> drivers/fpga/Makefile | 1 +
> drivers/fpga/intel-fpga-fme-region.c | 91 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 99 insertions(+)
> create mode 100644 drivers/fpga/intel-fpga-fme-region.c
>
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index 05e2a8e..db1a6ea 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -165,6 +165,13 @@ config INTEL_FPGA_FME_BRIDGE
> Say Y to enable FPGA Bridge driver for Intel FPGA Management
> Engine.
>
> +config INTEL_FPGA_FME_REGION
> + tristate "Intel FPGA FME Region Driver"
> + depends on INTEL_FPGA_FME && FPGA_REGION
> + help
> + Say Y to enable FPGA Region driver for Intel FPGA Management
> + Engine.
> +
> endif
>
> endif # FPGA
> diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
> index 131c105..fd0a71f 100644
> --- a/drivers/fpga/Makefile
> +++ b/drivers/fpga/Makefile
> @@ -33,6 +33,7 @@ obj-$(CONFIG_INTEL_FPGA_PCI) += intel-fpga-pci.o
> obj-$(CONFIG_INTEL_FPGA_FME) += intel-fpga-fme.o
> obj-$(CONFIG_INTEL_FPGA_FME_MGR) += intel-fpga-fme-mgr.o
> obj-$(CONFIG_INTEL_FPGA_FME_BRIDGE) += intel-fpga-fme-br.o
> +obj-$(CONFIG_INTEL_FPGA_FME_REGION) += intel-fpga-fme-region.o
>
> intel-fpga-pci-objs := intel-pcie.o intel-feature-dev.o
> intel-fpga-fme-objs := intel-fme-main.o intel-fme-pr.o
> diff --git a/drivers/fpga/intel-fpga-fme-region.c b/drivers/fpga/intel-fpga-fme-region.c
> new file mode 100644
> index 0000000..2b5ca4d
> --- /dev/null
> +++ b/drivers/fpga/intel-fpga-fme-region.c
> @@ -0,0 +1,91 @@
> +/*
> + * FPGA Region Driver for Intel FPGA Management Engine (FME)
> + *
> + * Copyright (C) 2017 Intel Corporation, Inc.
> + *
> + * Authors:
> + * Wu Hao <hao.wu@intel.com>
> + * Joseph Grecco <joe.grecco@intel.com>
> + * Enno Luebbers <enno.luebbers@intel.com>
> + * Tim Whisonant <tim.whisonant@intel.com>
> + * Ananda Ravuri <ananda.ravuri@intel.com>
> + * Henry Mitchel <henry.mitchel@intel.com>
> + *
> + * This work is licensed under the terms of the GNU GPL version 2. See
> + * the COPYING file in the top-level directory.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/fpga/fpga-region.h>
> +
> +#include "intel-feature-dev.h"
> +#include "intel-fme.h"
> +
> +static int fme_region_get_bridges(struct fpga_region *region,
> + struct fpga_image_info *info)
> +{
> + struct fme_region_pdata *pdata = region->priv;
> + struct device *dev = &pdata->br->dev;
> +
> + return fpga_bridge_get_to_list(dev, info, &region->bridge_list);
> +}
> +
> +static int fme_region_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct fme_region_pdata *pdata = dev_get_platdata(dev);
> + struct fpga_region *region;
> + struct fpga_manager *mgr;
> + int ret;
> +
> + mgr = fpga_mgr_get(&pdata->mgr->dev);
> + if (IS_ERR(mgr))
> + return -EPROBE_DEFER;
> +
> + region = devm_kzalloc(dev, sizeof(*region), GFP_KERNEL);
> + if (!region) {
> + ret = -ENOMEM;
> + goto eprobe_mgr_put;
> + }
> +
> + region->mgr = mgr;
> + region->get_bridges = fme_region_get_bridges;
> + region->priv = pdata;
> +
> + ret = fpga_region_register(dev, region);
> + if (ret)
> + goto eprobe_mgr_put;
> +
> + dev_dbg(dev, "Intel FME FPGA Region probed\n");
> +
> + return 0;
> +
> +eprobe_mgr_put:
> + fpga_mgr_put(mgr);
> + return ret;
> +}
> +
> +static int fme_region_remove(struct platform_device *pdev)
> +{
> + struct fpga_region *region = dev_get_drvdata(&pdev->dev);
> +
> + fpga_mgr_put(region->mgr);
> + fpga_region_unregister(region);

Please unregister before putting the mgr ;)

Alan

> +
> + return 0;
> +}
> +
> +static struct platform_driver fme_region_driver = {
> + .driver = {
> + .name = INTEL_FPGA_FME_REGION,
> + },
> + .probe = fme_region_probe,
> + .remove = fme_region_remove,
> +};
> +
> +module_platform_driver(fme_region_driver);
> +
> +MODULE_DESCRIPTION("FPGA Region for Intel FPGA Management Engine");
> +MODULE_AUTHOR("Intel Corporation");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:intel-fpga-fme-region");
> --
> 1.8.3.1
>

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