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Message-ID: <4002f681655dce0aa9ec0cceca744f237f392c81.camel@intel.com>
Date: Mon, 18 Nov 2024 23:04:15 +0000
From: "Colberg, Peter" <peter.colberg@...el.com>
To: "yilun.xu@...ux.intel.com" <yilun.xu@...ux.intel.com>
CC: "Xu, Yilun" <yilun.xu@...el.com>, "linux-fpga@...r.kernel.org"
<linux-fpga@...r.kernel.org>, "mdf@...nel.org" <mdf@...nel.org>, "Wu, Hao"
<hao.wu@...el.com>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>, "russ.weight@...ux.dev"
<russ.weight@...ux.dev>, "Pagani, Marco" <marpagan@...hat.com>,
"trix@...hat.com" <trix@...hat.com>,
"basheer.ahmed.muddebihal@...ux.intel.com"
<basheer.ahmed.muddebihal@...ux.intel.com>, "matthew.gerlach@...ux.intel.com"
<matthew.gerlach@...ux.intel.com>
Subject: Re: [PATCH v4 16/19] fpga: dfl: allocate platform device after
feature device data
On Mon, 2024-11-18 at 22:51 +0800, Xu Yilun wrote:
> On Fri, Oct 25, 2024 at 06:37:11PM -0400, Peter Colberg wrote:
> > Delay calling platform_device_alloc() from build_info_create_dev() to
> > feature_dev_register(), now that the feature device data contains all
> > necessary data to create the feature device. This completes the new
> > function feature_dev_register(), which will be reused in a subsequent
> > commit to fully recreate the feature device when assigning a port.
> >
> > Signed-off-by: Peter Colberg <peter.colberg@...el.com>
> > Reviewed-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> > Reviewed-by: Basheer Ahmed Muddebihal <basheer.ahmed.muddebihal@...ux.intel.com>
> > ---
> > Changes since v3:
> > - New patch extracted from last patch of v3 series.
> > ---
> > drivers/fpga/dfl.c | 59 +++++++++++++++++-----------------------------
> > 1 file changed, 22 insertions(+), 37 deletions(-)
> >
> > diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
> > index a9ec37278b2d..d9cef150ed0d 100644
> > --- a/drivers/fpga/dfl.c
> > +++ b/drivers/fpga/dfl.c
> > @@ -681,7 +681,6 @@ EXPORT_SYMBOL_GPL(dfl_fpga_dev_ops_unregister);
> > * @nr_irqs: number of irqs for all feature devices.
> > * @irq_table: Linux IRQ numbers for all irqs, indexed by local irq index of
> > * this device.
> > - * @feature_dev: current feature device.
> > * @type: the current FIU type.
> > * @ioaddr: header register region address of current FIU in enumeration.
> > * @start: register resource start of current FIU.
> > @@ -695,7 +694,6 @@ struct build_feature_devs_info {
> > unsigned int nr_irqs;
> > int *irq_table;
> >
> > - struct platform_device *feature_dev;
> > enum dfl_id_type type;
> > void __iomem *ioaddr;
> > resource_size_t start;
> > @@ -750,7 +748,6 @@ static void dfl_id_free_action(void *arg)
> > static struct dfl_feature_dev_data *
> > binfo_create_feature_dev_data(struct build_feature_devs_info *binfo)
> > {
> > - struct platform_device *fdev = binfo->feature_dev;
> > enum dfl_id_type type = binfo->type;
> > struct dfl_feature_info *finfo, *p;
> > struct dfl_feature_dev_data *fdata;
> > @@ -773,7 +770,6 @@ binfo_create_feature_dev_data(struct build_feature_devs_info *binfo)
> > if (!fdata->resources)
> > return ERR_PTR(-ENOMEM);
> >
> > - fdata->dev = fdev;
> > fdata->type = type;
> >
> > fdata->pdev_id = dfl_id_alloc(type, binfo->dev);
> > @@ -784,8 +780,6 @@ binfo_create_feature_dev_data(struct build_feature_devs_info *binfo)
> > if (ret)
> > return ERR_PTR(ret);
> >
> > - fdev->id = fdata->pdev_id;
> > -
> > fdata->pdev_name = dfl_devs[type].name;
> > fdata->num = binfo->feature_num;
> > fdata->dfl_cdev = binfo->cdev;
> > @@ -809,7 +803,6 @@ binfo_create_feature_dev_data(struct build_feature_devs_info *binfo)
> > unsigned int i;
> >
> > /* save resource information for each feature */
> > - feature->dev = fdev;
> > feature->id = finfo->fid;
> > feature->revision = finfo->revision;
> > feature->dfh_version = finfo->dfh_version;
> > @@ -868,18 +861,6 @@ binfo_create_feature_dev_data(struct build_feature_devs_info *binfo)
> > static int
> > build_info_create_dev(struct build_feature_devs_info *binfo)
> > {
> > - enum dfl_id_type type = binfo->type;
> > - struct platform_device *fdev;
> > -
> > - /*
> > - * we use -ENODEV as the initialization indicator which indicates
> > - * whether the id need to be reclaimed
> > - */
> > - fdev = platform_device_alloc(dfl_devs[type].name, -ENODEV);
> > - if (!fdev)
> > - return -ENOMEM;
> > -
> > - binfo->feature_dev = fdev;
> > binfo->feature_num = 0;
> >
> > INIT_LIST_HEAD(&binfo->sub_features);
> > @@ -895,27 +876,43 @@ build_info_create_dev(struct build_feature_devs_info *binfo)
> > static int feature_dev_register(struct dfl_feature_dev_data *fdata)
> > {
> > struct dfl_feature_platform_data pdata = {};
> > - struct platform_device *fdev = fdata->dev;
> > + struct platform_device *fdev;
> > + struct dfl_feature *feature;
> > int ret;
> >
> > + fdev = platform_device_alloc(fdata->pdev_name, fdata->pdev_id);
> > + if (!fdev)
> > + return -ENOMEM;
> > +
> > + fdata->dev = fdev;
> > +
> > fdev->dev.parent = &fdata->dfl_cdev->region->dev;
> > fdev->dev.devt = dfl_get_devt(dfl_devs[fdata->type].devt_type, fdev->id);
> >
> > + dfl_fpga_dev_for_each_feature(fdata, feature)
> > + feature->dev = fdev;
> > +
> > ret = platform_device_add_resources(fdev, fdata->resources,
> > fdata->resource_num);
> > if (ret)
> > - return ret;
> > + goto err_put_dev;
> >
> > pdata.fdata = fdata;
> > ret = platform_device_add_data(fdev, &pdata, sizeof(pdata));
> > if (ret)
> > - return ret;
> > + goto err_put_dev;
> >
> > ret = platform_device_add(fdev);
> > if (ret)
> > - return ret;
> > + goto err_put_dev;
> >
> > return 0;
> > +
> > +err_put_dev:
> > + platform_device_put(fdev);
> > + fdata->dev = NULL;
>
> Do we also need to clean up all the feature->dev?
Yes, thank you for the suggestion. It is not needed for functional
correctness since feature->dev is exclusively used when non-NULL, but
it seems a good idea for consistency.
Thanks,
Peter
>
> Thanks,
> Yilun
>
> > +
> > + return ret;
> > }
> >
> > static void feature_dev_unregister(struct dfl_feature_dev_data *fdata)
> > @@ -940,16 +937,7 @@ static int build_info_commit_dev(struct build_feature_devs_info *binfo)
> > if (binfo->type == PORT_ID)
> > dfl_fpga_cdev_add_port_data(binfo->cdev, fdata);
> > else
> > - binfo->cdev->fme_dev = get_device(&binfo->feature_dev->dev);
> > -
> > - /*
> > - * reset it to avoid build_info_free() freeing their resource.
> > - *
> > - * The resource of successfully registered feature devices
> > - * will be freed by platform_device_unregister(). See the
> > - * comments in build_info_create_dev().
> > - */
> > - binfo->feature_dev = NULL;
> > + binfo->cdev->fme_dev = get_device(&fdata->dev->dev);
> >
> > /* reset the binfo for next FIU */
> > binfo->type = DFL_ID_MAX;
> > @@ -966,8 +954,6 @@ static void build_info_free(struct build_feature_devs_info *binfo)
> > kfree(finfo);
> > }
> >
> > - platform_device_put(binfo->feature_dev);
> > -
> > devm_kfree(binfo->dev, binfo);
> > }
> >
> > @@ -1262,8 +1248,7 @@ static int parse_feature_afu(struct build_feature_devs_info *binfo,
> > case PORT_ID:
> > return parse_feature_port_afu(binfo, ofst);
> > default:
> > - dev_info(binfo->dev, "AFU belonging to FIU %s is not supported yet.\n",
> > - binfo->feature_dev->name);
> > + dev_info(binfo->dev, "AFU belonging to FIU is not supported yet.\n");
> > }
> >
> > return 0;
> > --
> > 2.47.0
> >
> >
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