Date:   Thu, 13 Jul 2017 10:31:51 +0800
From:   Wu Hao <hao.wu@...el.com>
To:     Alan Tull <atull@...nel.org>
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>
Subject: Re: [PATCH v2 17/22] fpga: intel: add fpga region platform driver
 for FME

On Wed, Jul 12, 2017 at 11:09:46AM -0500, Alan Tull wrote:
> On Sun, Jun 25, 2017 at 8:52 PM, Wu Hao <hao.wu@...el.com> wrote:
> 
> Hi Hao,
> 
> Thanks for using the region patchset.  This looks good except for one
> thing below.

Hi Alan

Thank you very much for your review. : )

> 
> > 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@...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: Wu Hao <hao.wu@...el.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@...el.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>
> > + *
> > + * 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 ;)
> 

Sure, make sense, I will fix this in the next version.

Thanks
Hao

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