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SubjectRe: [PATCH v2 1/4] fpga: dfl: change data type of feature id to u16
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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@redhat.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);
>>> }

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