[PATCH v3 2/8] disk: expose partition type flags

[Caleb Connolly]

GPT partition tables include two bytes worth of vendor defined
attributes, per partition. ChromeOS and Qualcomm both use these (with
different encoding!) to handle A/B slot switching with a retry counter.

Expose these via the disk_partition struct so that they can be parsed by
the relevant board code.

This will be used on Qualcomm boards to determine which slot we're
booting on so that we can flash capsule updates to the correct one.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>
Signed-off-by: Caleb Connolly <caleb.connolly at linaro.org>
---
 disk/part_efi.c | 1 +
 include/part.h  | 1 +
 2 files changed, 2 insertions(+)

diff --git a/disk/part_efi.c b/disk/part_efi.c
index b1a03bd165e0..bde4adcfa087 100644
--- a/disk/part_efi.c
+++ b/disk/part_efi.c
@@ -291,8 +291,9 @@ int part_get_info_efi(struct blk_desc *desc, int part,
 	snprintf((char *)info->name, sizeof(info->name), "%s",
 		 print_efiname(&gpt_pte[part - 1]));
 	strcpy((char *)info->type, "U-Boot");
 	info->bootable = get_bootable(&gpt_pte[part - 1]);
+	info->type_flags = gpt_pte[part - 1].attributes.fields.type_guid_specific;
 	if (CONFIG_IS_ENABLED(PARTITION_UUIDS)) {
 		uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b,
 				(char *)disk_partition_uuid(info),
 				UUID_STR_FORMAT_GUID);
diff --git a/include/part.h b/include/part.h
index 32ee40488563..afae51f1b933 100644
--- a/include/part.h
+++ b/include/part.h
@@ -68,8 +68,9 @@ struct disk_partition {
 	 * PART_BOOTABLE		the MBR bootable flag is set
 	 * PART_EFI_SYSTEM_PARTITION	the partition is an EFI system partition
 	 */
 	int	bootable;
+	u16	type_flags;	/* top 16 bits of GPT partition attributes	*/
 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 	char	uuid[UUID_STR_LEN + 1];	/* filesystem UUID as string, if exists	*/
 #endif
 #ifdef CONFIG_PARTITION_TYPE_GUID

-- 
2.45.0