[PATCH 09/19] powerpc: define DPS root partition type UUIDs
Vincent Mailhol <[email protected]> Mon, 15 Jun 2026 18:09:05 +0200
| Newsgroups | org.kernel.vger.linux-efi,org.kernel.vger.linux-block,org.kernel.vger.linux-fsdevel,org.kernel.vger.linux-kernel,org.ozlabs.lists.linuxppc-dev |
|---|---|
| Message-ID | <20260615-discoverable-root_partitions-v1-9-39c78fac42e2@kernel.org> |
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 <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: [email protected] Signed-off-by: Vincent Mailhol <[email protected]> --- 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