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Message-ID: <DM6PR11MB3819098B673C54530B227D4385159@DM6PR11MB3819.namprd11.prod.outlook.com>
Date: Mon, 12 Jul 2021 01:40:17 +0000
From: "Wu, Hao" <hao.wu@...el.com>
To: "trix@...hat.com" <trix@...hat.com>,
"mdf@...nel.org" <mdf@...nel.org>,
"corbet@....net" <corbet@....net>
CC: "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 4/4] fpga: remove compat_id from fpga_manager and
fpga_region
> -----Original Message-----
> From: trix@...hat.com <trix@...hat.com>
> Sent: Friday, July 9, 2021 9:42 PM
> To: mdf@...nel.org; corbet@....net; Wu, Hao <hao.wu@...el.com>
> Cc: linux-fpga@...r.kernel.org; linux-doc@...r.kernel.org; linux-
> kernel@...r.kernel.org; Tom Rix <trix@...hat.com>
> Subject: [PATCH v2 4/4] fpga: remove compat_id from fpga_manager and
> fpga_region
>
> From: Tom Rix <trix@...hat.com>
>
> compat_id is implementation specific. So the data should be
> stored at the implemeation layer, not the infrastructure layer.
> Remove the compat_id elements and supporting code.
I think current compat_id format can meet the checking requirement.
Actually I hope other hardware which needs compatible checking
to expose the same format compat_id. Then we can have more
unified/common code, e.g. userspace application/lib handling.
Currently I didn't see any other usage or requirement on this part
now, only DFL uses it. So should we leave it here at this moment?
I feel we don't have to change it for now to move it to a
Per-fpga-mgr format. : )
Thanks
Hao
>
> Printing out the compat_id is done with the fpga_region
> compat_id_show() op.
>
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
> drivers/fpga/dfl-fme-mgr.c | 7 -------
> drivers/fpga/dfl-fme-region.c | 1 -
> drivers/fpga/fpga-region.c | 7 +------
> include/linux/fpga/fpga-mgr.h | 13 -------------
> include/linux/fpga/fpga-region.h | 2 --
> 5 files changed, 1 insertion(+), 29 deletions(-)
>
> diff --git a/drivers/fpga/dfl-fme-mgr.c b/drivers/fpga/dfl-fme-mgr.c
> index cd0b9157ea6e5..8c5423eeffe75 100644
> --- a/drivers/fpga/dfl-fme-mgr.c
> +++ b/drivers/fpga/dfl-fme-mgr.c
> @@ -292,7 +292,6 @@ EXPORT_SYMBOL_GPL(fme_mgr_get_compat_id);
> static int fme_mgr_probe(struct platform_device *pdev)
> {
> struct dfl_fme_mgr_pdata *pdata = dev_get_platdata(&pdev->dev);
> - struct fpga_compat_id *compat_id;
> struct device *dev = &pdev->dev;
> struct fme_mgr_priv *priv;
> struct fpga_manager *mgr;
> @@ -312,10 +311,6 @@ static int fme_mgr_probe(struct platform_device
> *pdev)
> return PTR_ERR(priv->ioaddr);
> }
>
> - compat_id = devm_kzalloc(dev, sizeof(*compat_id), GFP_KERNEL);
> - if (!compat_id)
> - return -ENOMEM;
> -
> _fme_mgr_get_compat_id(priv->ioaddr, &priv->compat_id);
>
> mgr = devm_fpga_mgr_create(dev, "DFL FME FPGA Manager",
> @@ -323,8 +318,6 @@ static int fme_mgr_probe(struct platform_device *pdev)
> if (!mgr)
> return -ENOMEM;
>
> - mgr->compat_id = compat_id;
> -
> return devm_fpga_mgr_register(dev, mgr);
> }
>
> diff --git a/drivers/fpga/dfl-fme-region.c b/drivers/fpga/dfl-fme-region.c
> index d21eacbf2469f..be1d57ee37666 100644
> --- a/drivers/fpga/dfl-fme-region.c
> +++ b/drivers/fpga/dfl-fme-region.c
> @@ -64,7 +64,6 @@ static int fme_region_probe(struct platform_device *pdev)
> }
>
> region->priv = pdata;
> - region->compat_id = mgr->compat_id;
> platform_set_drvdata(pdev, region);
>
> ret = fpga_region_register(region);
> diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
> index 864dd4f290e3b..b08d3914716f0 100644
> --- a/drivers/fpga/fpga-region.c
> +++ b/drivers/fpga/fpga-region.c
> @@ -172,12 +172,7 @@ static ssize_t compat_id_show(struct device *dev,
> if (region->rops && region->rops->compat_id_show)
> return region->rops->compat_id_show(region, buf);
>
> - if (!region->compat_id)
> - return -ENOENT;
> -
> - return sprintf(buf, "%016llx%016llx\n",
> - (unsigned long long)region->compat_id->id_h,
> - (unsigned long long)region->compat_id->id_l);
> + return -ENOENT;
> }
>
> static DEVICE_ATTR_RO(compat_id);
> diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
> index ec2cd8bfceb00..ebdea215a8643 100644
> --- a/include/linux/fpga/fpga-mgr.h
> +++ b/include/linux/fpga/fpga-mgr.h
> @@ -143,24 +143,12 @@ struct fpga_manager_ops {
> #define FPGA_MGR_STATUS_IP_PROTOCOL_ERR BIT(3)
> #define FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR BIT(4)
>
> -/**
> - * struct fpga_compat_id - id for compatibility check
> - *
> - * @id_h: high 64bit of the compat_id
> - * @id_l: low 64bit of the compat_id
> - */
> -struct fpga_compat_id {
> - u64 id_h;
> - u64 id_l;
> -};
> -
> /**
> * struct fpga_manager - fpga manager structure
> * @name: name of low level fpga manager
> * @dev: fpga manager device
> * @ref_mutex: only allows one reference to fpga manager
> * @state: state of fpga manager
> - * @compat_id: FPGA manager id for compatibility check.
> * @mops: pointer to struct of fpga manager ops
> * @priv: low level driver private date
> */
> @@ -169,7 +157,6 @@ struct fpga_manager {
> struct device dev;
> struct mutex ref_mutex;
> enum fpga_mgr_states state;
> - struct fpga_compat_id *compat_id;
> const struct fpga_manager_ops *mops;
> void *priv;
> };
> diff --git a/include/linux/fpga/fpga-region.h b/include/linux/fpga/fpga-region.h
> index 236d3819f1c13..afc79784b2823 100644
> --- a/include/linux/fpga/fpga-region.h
> +++ b/include/linux/fpga/fpga-region.h
> @@ -30,7 +30,6 @@ struct fpga_region_ops {
> * @bridge_list: list of FPGA bridges specified in region
> * @mgr: FPGA manager
> * @info: FPGA image info
> - * @compat_id: FPGA region id for compatibility check.
> * @priv: private data
> * @rops: optional pointer to struct for fpga region ops
> */
> @@ -40,7 +39,6 @@ struct fpga_region {
> struct list_head bridge_list;
> struct fpga_manager *mgr;
> struct fpga_image_info *info;
> - struct fpga_compat_id *compat_id;
> void *priv;
> const struct fpga_region_ops *rops;
> };
> --
> 2.26.3
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