linux-kernel - [RFC PATCH v2 5/6] RISC-V: Expose Ssdtso via hwprobe API

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Date: Fri,  9 Feb 2024 07:40:49 +0100
From: Christoph Müllner <christoph.muellner@...ll.eu>
To: linux-riscv@...ts.infradead.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	Jonas Oberhauser <jonas.oberhauser@...weicloud.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Shuah Khan <shuah@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Anup Patel <apatel@...tanamicro.com>,
	Philipp Tomsich <philipp.tomsich@...ll.eu>,
	Andrew Jones <ajones@...tanamicro.com>,
	Guo Ren <guoren@...nel.org>,
	Daniel Henrique Barboza <dbarboza@...tanamicro.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Björn Töpel <bjorn@...osinc.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Will Deacon <will@...nel.org>,
	Daniel Lustig <dlustig@...dia.com>,
	Brendan Sweeney <turtwig@...xas.edu>,
	Andrew Waterman <andrew@...ive.com>,
	Brendan Sweeney <brs@...keley.edu>,
	Andrea Parri <parri.andrea@...il.com>,
	Hans Boehm <hboehm@...gle.com>
Cc: Christoph Müllner <christoph.muellner@...ll.eu>
Subject: [RFC PATCH v2 5/6] RISC-V: Expose Ssdtso via hwprobe API

This patch adds Ssdtso to the list of extensions which
are announced to user-space using te hwprobe API.

Signed-off-by: Christoph Müllner <christoph.muellner@...ll.eu>
---
 Documentation/arch/riscv/hwprobe.rst  | 3 +++
 arch/riscv/include/uapi/asm/hwprobe.h | 1 +
 arch/riscv/kernel/sys_hwprobe.c       | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
index b2bcc9eed9aa..d881d56eba37 100644
--- a/Documentation/arch/riscv/hwprobe.rst
+++ b/Documentation/arch/riscv/hwprobe.rst
@@ -188,6 +188,9 @@ The following keys are defined:
        manual starting from commit 95cf1f9 ("Add changes requested by Ved
        during signoff")
 
+  * :c:macro:`RISCV_HWPROBE_EXT_SSDTSO`: The Ssdtso extension is supported, as
+       in version v1.0-draft3 of the corresponding extension.
+
 * :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 9f2a8e3ff204..ee6e830abe4d 100644
--- a/arch/riscv/include/uapi/asm/hwprobe.h
+++ b/arch/riscv/include/uapi/asm/hwprobe.h
@@ -59,6 +59,7 @@ struct riscv_hwprobe {
 #define		RISCV_HWPROBE_EXT_ZTSO		(1ULL << 33)
 #define		RISCV_HWPROBE_EXT_ZACAS		(1ULL << 34)
 #define		RISCV_HWPROBE_EXT_ZICOND	(1ULL << 35)
+#define		RISCV_HWPROBE_EXT_SSDTSO	(1ULL << 36)
 #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 a7c56b41efd2..9024061e9193 100644
--- a/arch/riscv/kernel/sys_hwprobe.c
+++ b/arch/riscv/kernel/sys_hwprobe.c
@@ -132,6 +132,8 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 			EXT_KEY(ZFHMIN);
 			EXT_KEY(ZFA);
 		}
+
+		EXT_KEY(SSDTSO);
 #undef EXT_KEY
 	}
 
-- 
2.43.0