[PATCH v2 1/2] part: Add a function to find ESP partition

[Heinrich Schuchardt]

On 16.01.24 14:45, Heinrich Schuchardt wrote:
> On 16.01.24 13:36, Mayuresh Chitale wrote:
>> If a disk has an EFI system partition (ESP) then it can be used to
>> locate the boot files. Add a function to find the ESP.
>>
>> Signed-off-by: Mayuresh Chitale <mchitale at ventanamicro.com>
>> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>

I ran your patches through Gitlab CI and some issues came up:

https://source.denx.de/u-boot/custodians/u-boot-efi/-/jobs/771497
https://source.denx.de/u-boot/custodians/u-boot-efi/-/jobs/771498

Could you, please, have a look at it.

Best regards

Heinrich

>> ---
>>   disk/part.c    | 16 ++++++++++++++++
>>   include/part.h | 11 +++++++++++
>>   2 files changed, 27 insertions(+)
>>
>> diff --git a/disk/part.c b/disk/part.c
>> index 36b88205eca..6b1fbc18637 100644
>> --- a/disk/part.c
>> +++ b/disk/part.c
>> @@ -848,3 +848,19 @@ int part_get_bootable(struct blk_desc *desc)
>>       return 0;
>>   }
>> +
>> +int part_get_esp(struct blk_desc *desc)
>> +{
>> +    struct disk_partition info;
>> +    int p;
>> +
>> +    for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
>> +        int ret;
>> +
>> +        ret = part_get_info(desc, p, &info);
>> +        if (!ret && (info.bootable & PART_EFI_SYSTEM_PARTITION))
>> +            return p;
>> +    }
>> +
>> +    return 0;
>> +}
>> diff --git a/include/part.h b/include/part.h
>> index db34bc6bb7d..30e049c8f19 100644
>> --- a/include/part.h
>> +++ b/include/part.h
>> @@ -690,6 +690,14 @@ int part_get_type_by_name(const char *name);
>>    */
>>   int part_get_bootable(struct blk_desc *desc);
>> +/**
>> + * part_get_esp() - Find the EFI system partition
>> + *
>> + * @desc: Block-device descriptor
>> + * @Return the EFI system partition, or 0 if there is none
> 
> We want to be able to add the include to our API documentation. This 
> requires adhering to the Sphinx documentation style.
> 
> %s/@Return the/Return:/
> 
> Cf. 
> https://www.kernel.org/doc/html/v6.7/doc-guide/kernel-doc.html#function-documentation
> 
> Best regards
> 
> Heinrich
> 
>> + */
>> +int part_get_esp(struct blk_desc *desc);
>> +
>>   #else
>>   static inline int part_driver_get_count(void)
>>   { return 0; }
>> @@ -700,6 +708,9 @@ static inline struct part_driver 
>> *part_driver_get_first(void)
>>   static inline bool part_get_bootable(struct blk_desc *desc)
>>   { return false; }
>> +static inline bool part_get_esp(struct blk_desc *desc)
>> +{ return false; }
>> +
>>   #endif /* CONFIG_PARTITIONS */
>>   #endif /* _PART_H */
>