linux-kernel - [PATCH v3 19/20] riscv: hwprobe: export Zfa ISA extension

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Date:   Tue,  7 Nov 2023 11:55:55 +0100
From:   Clément Léger <cleger@...osinc.com>
To:     linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Cc:     Clément Léger <cleger@...osinc.com>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Jonathan Corbet <corbet@....net>,
        Andrew Jones <ajones@...tanamicro.com>,
        Evan Green <evan@...osinc.com>,
        Conor Dooley <conor@...nel.org>,
        Samuel Ortiz <sameo@...osinc.com>
Subject: [PATCH v3 19/20] riscv: hwprobe: export Zfa ISA extension

Export Zfa ISA extension[1] through hwprobe.

Link: https://drive.google.com/file/d/1VT6QIggpb59-8QRV266dEE4T8FZTxGq4/view [1]
Signed-off-by: Clément Léger <cleger@...osinc.com>
Reviewed-by: Evan Green <evan@...osinc.com>
---
 Documentation/arch/riscv/hwprobe.rst  | 4 ++++
 arch/riscv/include/uapi/asm/hwprobe.h | 1 +
 arch/riscv/kernel/sys_riscv.c         | 1 +
 3 files changed, 6 insertions(+)

diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
index 2a2fe4b026e7..a53fbc076d7e 100644
--- a/Documentation/arch/riscv/hwprobe.rst
+++ b/Documentation/arch/riscv/hwprobe.rst
@@ -154,6 +154,10 @@ The following keys are defined:
        defined in the RISC-V Vector manual starting from commit e2ccd0548d6c
        ("Remove draft warnings from Zvfh[min]").
 
+  * :c:macro:`RISCV_HWPROBE_EXT_ZFA`: The Zfa extension is supported as
+       defined in the RISC-V ISA manual starting from commit 056b6ff467c7
+       ("Zfa is ratified").
+
 * :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: A bitmask that contains performance
   information about the selected set of processors.
 
diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h
index 5124327b70ff..71f6cda52c4c 100644
--- a/arch/riscv/include/uapi/asm/hwprobe.h
+++ b/arch/riscv/include/uapi/asm/hwprobe.h
@@ -54,6 +54,7 @@ struct riscv_hwprobe {
 #define		RISCV_HWPROBE_EXT_ZIHINTNTL	(1 << 28)
 #define		RISCV_HWPROBE_EXT_ZVFH		(1 << 29)
 #define		RISCV_HWPROBE_EXT_ZVFHMIN	(1 << 30)
+#define		RISCV_HWPROBE_EXT_ZFA		(1 << 31)
 #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_riscv.c b/arch/riscv/kernel/sys_riscv.c
index 3cd5d42ae01f..dedfe3c6a37b 100644
--- a/arch/riscv/kernel/sys_riscv.c
+++ b/arch/riscv/kernel/sys_riscv.c
@@ -192,6 +192,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 		if (has_fpu()) {
 			CHECK_ISA_EXT(ZFH);
 			CHECK_ISA_EXT(ZFHMIN);
+			CHECK_ISA_EXT(ZFA);
 		}
 #undef CHECK_ISA_EXT
 	}
-- 
2.42.0