[PATCH v1 2/4] scsi: Add partition lookup by type GUID for SCSI devices

[Varadarajan Narayanan]

On Thu, Jan 08, 2026 at 12:19:45PM +0530, Balaji Selvanathan wrote:
> Introduce scsi_get_blk_by_type_guid() function to enable SCSI
> partition discovery using partition type GUID. This function scans
> all available SCSI devices and searches for a partition matching the
> specified type GUID.
>
> Signed-off-by: Balaji Selvanathan <balaji.selvanathan at oss.qualcomm.com>
> ---
>  drivers/scsi/scsi-uclass.c | 28 ++++++++++++++++++++++++++++
>  include/scsi.h             | 11 +++++++++++
>  2 files changed, 39 insertions(+)
>
> diff --git a/drivers/scsi/scsi-uclass.c b/drivers/scsi/scsi-uclass.c
> index 3eb6069649f..42a6b5233c2 100644
> --- a/drivers/scsi/scsi-uclass.c
> +++ b/drivers/scsi/scsi-uclass.c
> @@ -53,6 +53,34 @@ int scsi_get_blk_by_uuid(const char *uuid,
>  	return -1;
>  }
>
> +int scsi_get_blk_by_type_guid(const char *type_guid,
> +			      struct blk_desc **blk_desc_ptr,
> +			      struct disk_partition *part_info_ptr)
> +{
> +	static int is_scsi_scanned;
> +	struct blk_desc *blk;
> +	int i, ret;
> +
> +	if (!is_scsi_scanned) {
> +		scsi_scan(false /* no verbose */);
> +		is_scsi_scanned = 1;
> +	}
> +
> +	for (i = 0; i < blk_find_max_devnum(UCLASS_SCSI) + 1; i++) {

	max = blk_find_max_devnum(UCLASS_SCSI) + 1;
	for (i = 0; i < max; i++) {

Else, i believe blk_find_max_devnum() will get invoked multiple times.

-Varada

> +		ret = blk_get_desc(UCLASS_SCSI, i, &blk);
> +		if (ret)
> +			continue;
> +
> +		ret = part_get_info_by_type_guid(blk, type_guid, part_info_ptr);
> +		if (ret > 0) {
> +			*blk_desc_ptr = blk;
> +			return 0;
> +		}
> +	}
> +
> +	return -1;
> +}
> +
>  int scsi_bus_reset(struct udevice *dev)
>  {
>  	struct scsi_ops *ops = scsi_get_ops(dev);
> diff --git a/include/scsi.h b/include/scsi.h
> index 8d6c5116419..e0b2f869057 100644
> --- a/include/scsi.h
> +++ b/include/scsi.h
> @@ -361,6 +361,17 @@ int scsi_scan_dev(struct udevice *dev, bool verbose);
>  int scsi_get_blk_by_uuid(const char *uuid, struct blk_desc **blk_desc_ptr,
>  			 struct disk_partition *part_info_ptr);
>
> +
> +/**
> + * scsi_get_blk_by_type_guid() - Provides SCSI partition information by type GUID.
> + *
> + * @type_guid:		Type GUID of the partition for fetching its info
> + * @blk_desc_ptr:	Provides the blk descriptor
> + * @part_info_ptr:	Provides partition info
> + */
> +int scsi_get_blk_by_type_guid(const char *type_guid, struct blk_desc **blk_desc_ptr,
> +			      struct disk_partition *part_info_ptr);
> +
>  #define SCSI_IDENTIFY					0xC0  /* not used */
>
>  /* Hardware errors  */
> --
> 2.34.1
>