linux-kernel - [PATCH v2 0/4] riscv: Add Zalasr ISA extension support

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Message-Id: <20250902042432.78960-1-luxu.kernel@bytedance.com>
Date: Tue,  2 Sep 2025 12:24:28 +0800
From: Xu Lu <luxu.kernel@...edance.com>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	alex@...ti.fr,
	ajones@...tanamicro.com,
	brs@...osinc.com
Cc: devicetree@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	apw@...onical.com,
	joe@...ches.com,
	Xu Lu <luxu.kernel@...edance.com>
Subject: [PATCH v2 0/4] riscv: Add Zalasr ISA extension support

This patch adds support for the Zalasr ISA extension, which supplies the
real load acquire/store release instructions.

The specification can be found here:
https://github.com/riscv/riscv-zalasr/blob/main/chapter2.adoc

This patch seires has been tested with ltp on Qemu with Brensan's zalasr
support patch[1].

Some false positive spacing error happens during patch checking. Thus I
CCed maintainers of checkpatch.pl as well.

[1] https://lore.kernel.org/all/CAGPSXwJEdtqW=nx71oufZp64nK6tK=0rytVEcz4F-gfvCOXk2w@mail.gmail.com/

v2:
 - Adjust the order of Zalasr and Zalrsc in dt-bindings. Thanks to 
Conor.

Xu Lu (4):
  riscv: add ISA extension parsing for Zalasr
  dt-bindings: riscv: Add Zalasr ISA extension description
  riscv: Instroduce Zalasr instructions
  riscv: Use Zalasr for smp_load_acquire/smp_store_release

 .../devicetree/bindings/riscv/extensions.yaml |  5 ++
 arch/riscv/include/asm/barrier.h              | 79 ++++++++++++++++---
 arch/riscv/include/asm/hwcap.h                |  1 +
 arch/riscv/include/asm/insn-def.h             | 79 +++++++++++++++++++
 arch/riscv/kernel/cpufeature.c                |  1 +
 5 files changed, 154 insertions(+), 11 deletions(-)

-- 
2.20.1