[PATCH v3 3/8] riscv: hwprobe: Export Zalasr extension

Xu Lu
2025-09-19T07:38:01Z

Export the Zalasr extension to userspace using hwprobe.

Signed-off-by: Xu Lu <luxu.kernel@bytedance.com>
---
Documentation/arch/riscv/hwprobe.rst | 5 ++++-
arch/riscv/include/uapi/asm/hwprobe.h | 1 +
arch/riscv/kernel/sys_hwprobe.c | 1 +
3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
index 2aa9be272d5de..067a3595fb9d5 100644
--- a/Documentation/arch/riscv/hwprobe.rst
+++ b/Documentation/arch/riscv/hwprobe.rst
@@ -249,6 +249,9 @@ The following keys are defined:
defined in the in the RISC-V ISA manual starting from commit e87412e621f1
("integrate Zaamo and Zalrsc text (#1304)").

+ * :c:macro:`RISCV_HWPROBE_EXT_ZALASR`: The Zalasr extension is supported as
+ frozen at commit 194f0094 ("Version 0.9 for freeze") of riscv-zalasr.
+
* :c:macro:`RISCV_HWPROBE_EXT_ZALRSC`: The Zalrsc extension is supported as
defined in the in the RISC-V ISA manual starting from commit e87412e621f1
("integrate Zaamo and Zalrsc text (#1304)").
@@ -360,4 +363,4 @@ The following keys are defined:

* :c:macro:`RISCV_HWPROBE_VENDOR_EXT_XSFVFWMACCQQQ`: The Xsfvfwmaccqqq
vendor extension is supported in version 1.0 of Matrix Multiply Accumulate
- Instruction Extensions Specification.
\ No newline at end of file
+ Instruction Extensions Specification.
diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h
index aaf6ad9704993..d3a65f8ff7da4 100644
--- a/arch/riscv/include/uapi/asm/hwprobe.h
+++ b/arch/riscv/include/uapi/asm/hwprobe.h
@@ -82,6 +82,7 @@ struct riscv_hwprobe {
#define RISCV_HWPROBE_EXT_ZAAMO (1ULL << 56)
#define RISCV_HWPROBE_EXT_ZALRSC (1ULL << 57)
#define RISCV_HWPROBE_EXT_ZABHA (1ULL << 58)
+#define RISCV_HWPROBE_EXT_ZALASR (1ULL << 59)
#define RISCV_HWPROBE_KEY_CPUPERF_0 5
#define RISCV_HWPROBE_MISALIGNED_UNKNOWN (0 << 0)
#define RISCV_HWPROBE_MISALIGNED_EMULATED (1 << 0)
diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c
index 0b170e18a2beb..0529e692b1173 100644
--- a/arch/riscv/kernel/sys_hwprobe.c
+++ b/arch/riscv/kernel/sys_hwprobe.c
@@ -99,6 +99,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
EXT_KEY(ZAAMO);
EXT_KEY(ZABHA);
EXT_KEY(ZACAS);
+ EXT_KEY(ZALASR);
EXT_KEY(ZALRSC);
EXT_KEY(ZAWRS);
EXT_KEY(ZBA);
--
2.20.1