linux-kernel - Re: [PATCH v2 1/4] fpga: dfl: change data type of feature id to u16

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Date:   Sat, 1 Aug 2020 08:40:54 -0700
From:   Tom Rix <trix@...hat.com>
To:     Xu Yilun <yilun.xu@...el.com>
Cc:     mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, lgoncalv@...hat.com
Subject: Re: [PATCH v2 1/4] fpga: dfl: change data type of feature id to u16


On 7/31/20 12:48 AM, Xu Yilun wrote:
> On Sat, Jul 25, 2020 at 06:29:53AM -0700, Tom Rix wrote:
>> It would be good if the variable or element for the feature id had a consistent name.
>>
>>
>>> @@ -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;
>>>  };
>> Is this structure needed ?
>>
>> Here is how it could be changed to 
>>
>> struct dfl_feature_driver {
>>
>> -    const dfl_feature_id *
>>
>> +    const u16 *id_table;
> This structure is to represent an id type, which is used to match
> fme/port owned features. It could be extended if some feature drivers
> needs driver_data.
>
> Actually I see some example of device_ids with similar structure, like:
>
>   struct mips_cdmm_device_id {
>   	__u8	type;
>   };
>
>   struct tee_client_device_id {
> 	uuid_t uuid;
>   };
>
Ok.

Reviewed-by: Tom Rix <trix@...hat.com>

> Thanks,
> Yilun.
>
>> ...
>>
>> Tom
>>
>>
>>>  
>>>  /**
>>> @@ -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;
>>> @@ -371,7 +371,7 @@ 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;
>>> @@ -384,7 +384,7 @@ 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);
>>>  
>>> @@ -395,7 +395,7 @@ 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);
>>>  }