[PATCH 10/19] riscv: define DPS root partition type UUIDs

[Vincent Mailhol]

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 RISC-V
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: Paul Walmsley <pjw at kernel.org>
Cc: Palmer Dabbelt <palmer at dabbelt.com>
Cc: Albert Ou <aou at eecs.berkeley.edu>
Cc: linux-riscv at lists.infradead.org
Signed-off-by: Vincent Mailhol <mailhol at kernel.org>
---
 arch/riscv/Kconfig                |  1 +
 arch/riscv/include/asm/dps_root.h | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 1a2fadccd4c4..526be67e858a 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -28,6 +28,7 @@ config RISCV
 	select ARCH_HAS_DEBUG_VIRTUAL if MMU
 	select ARCH_HAS_DEBUG_VM_PGTABLE
 	select ARCH_HAS_DEBUG_WX
+	select ARCH_HAS_DPS_ROOT_PARTITION_TYPE_UUID
 	select ARCH_HAS_ELF_CORE_EFLAGS if BINFMT_ELF && ELF_CORE
 	select ARCH_HAS_FAST_MULTIPLIER
 	select ARCH_HAS_FORTIFY_SOURCE
diff --git a/arch/riscv/include/asm/dps_root.h b/arch/riscv/include/asm/dps_root.h
new file mode 100644
index 000000000000..86f8e1dbd6ad
--- /dev/null
+++ b/arch/riscv/include/asm/dps_root.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _ASM_RISCV_DPS_ROOT_H
+#define _ASM_RISCV_DPS_ROOT_H
+
+#ifdef CONFIG_64BIT
+#define DPS_ROOT_PARTITION_TYPE_UUID "72ec70a6-cf74-40e6-bd49-4bda08e8f224"
+#else
+#define DPS_ROOT_PARTITION_TYPE_UUID "60d5a7fe-8e7d-435c-b714-3dd8162144e1"
+#endif
+
+#endif /* _ASM_RISCV_DPS_ROOT_H */

-- 
2.53.0