[PATCH 09/19] powerpc: define DPS root partition type UUIDs
From: Vincent Mailhol <mailhol@kernel.org>
Date: 2026-06-15 16:10:46
Also in:
linux-block, linux-efi, linux-fsdevel, lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
DPS [1] assigns GPT partition type UUIDs to operating system partitions. Root partitions use architecture-specific type UUIDs so the OS can discover the intended root filesystem without relying on a root= cmdline option. Define DPS_ROOT_PARTITION_TYPE_UUID in asm/dps_root.h for the powerpc endian and 32/64-bit variants described by the specification and select ARCH_HAS_DPS_ROOT_PARTITION_TYPE_UUID. [1] The Discoverable Partitions Specification (DPS) Link: https://uapi-group.org/specifications/specs/discoverable_partitions_specification/ Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Vincent Mailhol <mailhol@kernel.org> --- arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/dps_root.h | 16 ++++++++++++++++ 2 files changed, 17 insertions(+)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e93df95b79e7..e611280a6057 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig@@ -134,6 +134,7 @@ config PPC select ARCH_HAS_DEVMEM_IS_ALLOWED select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES select ARCH_HAS_DMA_OPS if PPC64 + select ARCH_HAS_DPS_ROOT_PARTITION_TYPE_UUID select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_GIGANTIC_PAGE if ARCH_SUPPORTS_HUGETLBFS
diff --git a/arch/powerpc/include/asm/dps_root.h b/arch/powerpc/include/asm/dps_root.h
new file mode 100644
index 000000000000..6b3592a73d3d
--- /dev/null
+++ b/arch/powerpc/include/asm/dps_root.h@@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef _ASM_POWERPC_DPS_ROOT_H +#define _ASM_POWERPC_DPS_ROOT_H + +#ifdef CONFIG_PPC64 +#ifdef CONFIG_CPU_LITTLE_ENDIAN +#define DPS_ROOT_PARTITION_TYPE_UUID "c31c45e6-3f39-412e-80fb-4809c4980599" +#else +#define DPS_ROOT_PARTITION_TYPE_UUID "912ade1d-a839-4913-8964-a10eee08fbd2" +#endif +#else +#define DPS_ROOT_PARTITION_TYPE_UUID "1de3f1ef-fa98-47b5-8dcd-4a860a654d78" +#endif + +#endif /* _ASM_POWERPC_DPS_ROOT_H */
--
2.53.0