linux-kernel - [PATCH v5 6/8] riscv: hwprobe: add zve Vector subextensions into hwprobe interface

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Message-Id: <20240510-zve-detection-v5-6-0711bdd26c12@sifive.com>
Date: Fri, 10 May 2024 00:26:56 +0800
From: Andy Chiu <andy.chiu@...ive.com>
To: Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Conor Dooley <conor.dooley@...rochip.com>, Heiko Stuebner <heiko@...ech.de>, 
 Andy Chiu <andy.chiu@...ive.com>, Guo Ren <guoren@...nel.org>, 
 Conor Dooley <conor@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Jonathan Corbet <corbet@....net>, Evan Green <evan@...osinc.com>, 
 Clément Léger <cleger@...osinc.com>, 
 Shuah Khan <shuah@...nel.org>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Palmer Dabbelt <palmer@...osinc.com>, 
 Vincent Chen <vincent.chen@...ive.com>, 
 Greentime Hu <greentime.hu@...ive.com>, devicetree@...r.kernel.org, 
 linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH v5 6/8] riscv: hwprobe: add zve Vector subextensions into
 hwprobe interface

The following Vector subextensions for "embedded" platforms are added
into RISCV_HWPROBE_KEY_IMA_EXT_0:
 - ZVE32X
 - ZVE32F
 - ZVE64X
 - ZVE64F
 - ZVE64D

Extensions ending with an X indicates that the platform doesn't have a
vector FPU.
Extensions ending with F/D mean that whether single (F) or double (D)
precision vector operation is supported.
The number 32 or 64 follows from ZVE tells the maximum element length.

Signed-off-by: Andy Chiu <andy.chiu@...ive.com>
Reviewed-by: Clément Léger <cleger@...osinc.com>
---
Changelog v5:
 - Rebase thus add ZVE32X after RISCV_HWPROBE_EXT_ZICOND.
Changelog v2:
 - zve* extensions in hwprobe depends on whether kernel supports v, so
   include them after has_vector(). Fix a typo. (Clément)
---
 Documentation/arch/riscv/hwprobe.rst  | 15 +++++++++++++++
 arch/riscv/include/uapi/asm/hwprobe.h |  5 +++++
 arch/riscv/kernel/sys_hwprobe.c       |  5 +++++
 3 files changed, 25 insertions(+)

diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
index 204cd4433af5..fc015b452ebf 100644
--- a/Documentation/arch/riscv/hwprobe.rst
+++ b/Documentation/arch/riscv/hwprobe.rst
@@ -192,6 +192,21 @@ The following keys are defined:
        supported as defined in the RISC-V ISA manual starting from commit
        d8ab5c78c207 ("Zihintpause is ratified").
 
+  * :c:macro:`RISCV_HWPROBE_EXT_ZVE32X`: The Vector sub-extension Zve32x is
+    supported, as defined by version 1.0 of the RISC-V Vector extension manual.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZVE32F`: The Vector sub-extension Zve32f is
+    supported, as defined by version 1.0 of the RISC-V Vector extension manual.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZVE64X`: The Vector sub-extension Zve64x is
+    supported, as defined by version 1.0 of the RISC-V Vector extension manual.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZVE64F`: The Vector sub-extension Zve64f is
+    supported, as defined by version 1.0 of the RISC-V Vector extension manual.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZVE64D`: The Vector sub-extension Zve64d is
+    supported, as defined by version 1.0 of the RISC-V Vector extension manual.
+
 * :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 31c570cbd1c5..6593aedb9d2b 100644
--- a/arch/riscv/include/uapi/asm/hwprobe.h
+++ b/arch/riscv/include/uapi/asm/hwprobe.h
@@ -60,6 +60,11 @@ struct riscv_hwprobe {
 #define		RISCV_HWPROBE_EXT_ZACAS		(1ULL << 34)
 #define		RISCV_HWPROBE_EXT_ZICOND	(1ULL << 35)
 #define		RISCV_HWPROBE_EXT_ZIHINTPAUSE	(1ULL << 36)
+#define		RISCV_HWPROBE_EXT_ZVE32X	(1ULL << 37)
+#define		RISCV_HWPROBE_EXT_ZVE32F	(1ULL << 38)
+#define		RISCV_HWPROBE_EXT_ZVE64X	(1ULL << 39)
+#define		RISCV_HWPROBE_EXT_ZVE64F	(1ULL << 40)
+#define		RISCV_HWPROBE_EXT_ZVE64D	(1ULL << 41)
 #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 969ef3d59dbe..35390b4a5a17 100644
--- a/arch/riscv/kernel/sys_hwprobe.c
+++ b/arch/riscv/kernel/sys_hwprobe.c
@@ -114,6 +114,11 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 		EXT_KEY(ZIHINTPAUSE);
 
 		if (has_vector()) {
+			EXT_KEY(ZVE32X);
+			EXT_KEY(ZVE32F);
+			EXT_KEY(ZVE64X);
+			EXT_KEY(ZVE64F);
+			EXT_KEY(ZVE64D);
 			EXT_KEY(ZVBB);
 			EXT_KEY(ZVBC);
 			EXT_KEY(ZVKB);

-- 
2.44.0.rc2