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Date:   Tue, 11 Aug 2020 20:56:04 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     Xu Yilun <yilun.xu@...el.com>
Cc:     mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, trix@...hat.com, lgoncalv@...hat.com
Subject: Re: [PATCH v4 1/4] fpga: dfl: change data type of feature id to u16

On Mon, Aug 10, 2020 at 10:41:10AM +0800, Xu Yilun wrote:
> The feature id is stored in a 12 bit field in DFH. So a u16 variable is
> enough for feature id.
> 
> This patch changes all feature id related places to fit u16.
> 
> Signed-off-by: Xu Yilun <yilun.xu@...el.com>
> Reviewed-by: Tom Rix <trix@...hat.com>
> Acked-by: Wu Hao <hao.wu@...el.com>
> ---
> v3: no change.
> v4: no change.
> ---
>  drivers/fpga/dfl-fme-perf.c |  2 +-
>  drivers/fpga/dfl.c          | 29 +++++++++++++++--------------
>  drivers/fpga/dfl.h          | 10 +++++-----
>  3 files changed, 21 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/fpga/dfl-fme-perf.c b/drivers/fpga/dfl-fme-perf.c
> index 6ce1ed2..5312662 100644
> --- a/drivers/fpga/dfl-fme-perf.c
> +++ b/drivers/fpga/dfl-fme-perf.c
> @@ -148,7 +148,7 @@ struct fme_perf_priv {
>  	struct device *dev;
>  	void __iomem *ioaddr;
>  	struct pmu pmu;
> -	u64 id;
> +	u16 id;
>  
>  	u32 fab_users;
>  	u32 fab_port_id;
> diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
> index 649958a..18575d9 100644
> --- a/drivers/fpga/dfl.c
> +++ b/drivers/fpga/dfl.c
> @@ -58,7 +58,7 @@ static const char *dfl_pdata_key_strings[DFL_ID_MAX] = {
>   */
>  struct dfl_dev_info {
>  	const char *name;
> -	u32 dfh_id;
> +	u16 dfh_id;
>  	struct idr id;
>  	enum dfl_fpga_devt_type devt_type;
>  };
> @@ -134,7 +134,7 @@ static enum dfl_id_type feature_dev_id_type(struct platform_device *pdev)
>  	return DFL_ID_MAX;
>  }
>  
> -static enum dfl_id_type dfh_id_to_type(u32 id)
> +static enum dfl_id_type dfh_id_to_type(u16 id)
>  {
>  	int i;
>  
> @@ -454,7 +454,7 @@ struct build_feature_devs_info {
>   * @nr_irqs: number of irqs of this sub feature.
>   */
>  struct dfl_feature_info {
> -	u64 fid;
> +	u16 fid;
>  	struct resource mmio_res;
>  	void __iomem *ioaddr;
>  	struct list_head node;
> @@ -649,7 +649,7 @@ static inline u32 feature_size(void __iomem *start)
>  	return ofst ? ofst : 4096;
>  }
>  
> -static u64 feature_id(void __iomem *start)
> +static u16 feature_id(void __iomem *start)
>  {
>  	u64 v = readq(start + DFH);
>  	u16 id = FIELD_GET(DFH_ID, v);
> @@ -667,7 +667,7 @@ static u64 feature_id(void __iomem *start)
>  }
>  
>  static int parse_feature_irqs(struct build_feature_devs_info *binfo,
> -			      resource_size_t ofst, u64 fid,
> +			      resource_size_t ofst, u16 fid,
>  			      unsigned int *irq_base, unsigned int *nr_irqs)
>  {
>  	void __iomem *base = binfo->ioaddr + ofst;
> @@ -713,12 +713,12 @@ static int parse_feature_irqs(struct build_feature_devs_info *binfo,
>  		return 0;
>  	}
>  
> -	dev_dbg(binfo->dev, "feature: 0x%llx, irq_base: %u, nr_irqs: %u\n",
> +	dev_dbg(binfo->dev, "feature: 0x%x, irq_base: %u, nr_irqs: %u\n",
>  		fid, ibase, inr);
>  
>  	if (ibase + inr > binfo->nr_irqs) {
>  		dev_err(binfo->dev,
> -			"Invalid interrupt number in feature 0x%llx\n", fid);
> +			"Invalid interrupt number in feature 0x%x\n", fid);
>  		return -EINVAL;
>  	}
>  
> @@ -726,7 +726,7 @@ static int parse_feature_irqs(struct build_feature_devs_info *binfo,
>  		virq = binfo->irq_table[ibase + i];
>  		if (virq < 0 || virq > NR_IRQS) {
>  			dev_err(binfo->dev,
> -				"Invalid irq table entry for feature 0x%llx\n",
> +				"Invalid irq table entry for feature 0x%x\n",
>  				fid);
>  			return -EINVAL;
>  		}
> @@ -748,7 +748,7 @@ static int parse_feature_irqs(struct build_feature_devs_info *binfo,
>  static int
>  create_feature_instance(struct build_feature_devs_info *binfo,
>  			struct dfl_fpga_enum_dfl *dfl, resource_size_t ofst,
> -			resource_size_t size, u64 fid)
> +			resource_size_t size, u16 fid)
>  {
>  	unsigned int irq_base, nr_irqs;
>  	struct dfl_feature_info *finfo;
> @@ -819,9 +819,10 @@ static int parse_feature_fiu(struct build_feature_devs_info *binfo,
>  			     struct dfl_fpga_enum_dfl *dfl,
>  			     resource_size_t ofst)
>  {
> -	u32 id, offset;
> -	u64 v;
>  	int ret = 0;
> +	u32 offset;
> +	u16 id;
> +	u64 v;
>  
>  	v = readq(dfl->ioaddr + ofst + DFH);
>  	id = FIELD_GET(DFH_ID, v);
> @@ -855,8 +856,8 @@ static int parse_feature_private(struct build_feature_devs_info *binfo,
>  				 resource_size_t ofst)
>  {
>  	if (!binfo->feature_dev) {
> -		dev_err(binfo->dev, "the private feature %llx does not belong to any AFU.\n",
> -			(unsigned long long)feature_id(dfl->ioaddr + ofst));
> +		dev_err(binfo->dev, "the private feature 0x%x does not belong to any AFU.\n",
> +			feature_id(dfl->ioaddr + ofst));
>  		return -EINVAL;
>  	}
>  
> @@ -1424,7 +1425,7 @@ static int do_set_irq_trigger(struct dfl_feature *feature, unsigned int idx,
>  		return 0;
>  
>  	feature->irq_ctx[idx].name =
> -		kasprintf(GFP_KERNEL, "fpga-irq[%u](%s-%llx)", idx,
> +		kasprintf(GFP_KERNEL, "fpga-irq[%u](%s-%x)", idx,
>  			  dev_name(&pdev->dev), feature->id);
>  	if (!feature->irq_ctx[idx].name)
>  		return -ENOMEM;
> diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
> index a32dfba..bc61942 100644
> --- a/drivers/fpga/dfl.h
> +++ b/drivers/fpga/dfl.h
> @@ -197,7 +197,7 @@ int dfl_fpga_check_port_id(struct platform_device *pdev, void *pport_id);
>   * @id: unique dfl private feature id.
>   */
>  struct dfl_feature_id {
> -	u64 id;
> +	u16 id;
>  };
>  
>  /**
> @@ -240,7 +240,7 @@ struct dfl_feature_irq_ctx {
>   */
>  struct dfl_feature {
>  	struct platform_device *dev;
> -	u64 id;
> +	u16 id;
>  	int resource_index;
>  	void __iomem *ioaddr;
>  	struct dfl_feature_irq_ctx *irq_ctx;
> @@ -365,7 +365,7 @@ struct platform_device *dfl_fpga_inode_to_feature_dev(struct inode *inode)
>  	   (feature) < (pdata)->features + (pdata)->num; (feature)++)
>  
>  static inline
> -struct dfl_feature *dfl_get_feature_by_id(struct device *dev, u64 id)
> +struct dfl_feature *dfl_get_feature_by_id(struct device *dev, u16 id)
>  {
>  	struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
>  	struct dfl_feature *feature;
> @@ -378,7 +378,7 @@ struct dfl_feature *dfl_get_feature_by_id(struct device *dev, u64 id)
>  }
>  
>  static inline
> -void __iomem *dfl_get_feature_ioaddr_by_id(struct device *dev, u64 id)
> +void __iomem *dfl_get_feature_ioaddr_by_id(struct device *dev, u16 id)
>  {
>  	struct dfl_feature *feature = dfl_get_feature_by_id(dev, id);
>  
> @@ -389,7 +389,7 @@ void __iomem *dfl_get_feature_ioaddr_by_id(struct device *dev, u64 id)
>  	return NULL;
>  }
>  
> -static inline bool is_dfl_feature_present(struct device *dev, u64 id)
> +static inline bool is_dfl_feature_present(struct device *dev, u16 id)
>  {
>  	return !!dfl_get_feature_ioaddr_by_id(dev, id);
>  }
> -- 
> 2.7.4
> 

Applied to for-next,

Thanks

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