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

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Message-ID: <20250919073714.83063-4-luxu.kernel@bytedance.com>
Date: Fri, 19 Sep 2025 15:37:09 +0800
From: Xu Lu <luxu.kernel@...edance.com>
To: corbet@....net,
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	Xu Lu <luxu.kernel@...edance.com>
Subject: [PATCH v3 3/8] riscv: hwprobe: Export Zalasr extension

Export the Zalasr extension to userspace using hwprobe.

Signed-off-by: Xu Lu <luxu.kernel@...edance.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