linux-kernel - [PATCH v3 0/4] riscv: Add Zicbop & prefetchw support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250421142441.395849-1-alexghiti@rivosinc.com>
Date: Mon, 21 Apr 2025 16:24:37 +0200
From: Alexandre Ghiti <alexghiti@...osinc.com>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Alexandre Ghiti <alex@...ti.fr>,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Alexandre Ghiti <alexghiti@...osinc.com>
Subject: [PATCH v3 0/4] riscv: Add Zicbop & prefetchw support

I found this lost series developed by Guo so here is a respin with the
comments on v2 applied.

This patch series adds Zicbop support and then enables the Linux
prefetch features.

Changelog:
V3:
 - Fix typo (Drew)
 - Split first patch (Drew)
 - Ensure that the bits [0:4] of the prefetch insns are zeroed
 - Move PREFETCHW_ASM out of ifdef (Guo)
 - Remove CBO_ prefix for prefetching insn
 - Add prefetch (Drew)

V2: https://lore.kernel.org/linux-riscv/20231231082955.16516-1-guoren@kernel.org/
 - Separate from the qspinlock series
 - Optimize coding convention with last review advice
 - Add DEFINE_INSN_S type in insn-def.h
 - Add CBO_PREFETCH_I/R/W

V1:
https://lore.kernel.org/linux-riscv/20230910082911.3378782-4-guoren@kernel.org/

Alexandre Ghiti (2):
  riscv: Introduce Zicbop instructions
  riscv: Add support for Zicbop

Guo Ren (2):
  riscv: Add ARCH_HAS_PREFETCH[W] support with Zicbop
  riscv: xchg: Prefetch the destination word for sc.w

 arch/riscv/Kconfig                  | 15 +++++++
 arch/riscv/include/asm/barrier.h    |  5 ---
 arch/riscv/include/asm/cacheflush.h |  1 +
 arch/riscv/include/asm/cmpxchg.h    |  4 +-
 arch/riscv/include/asm/hwcap.h      |  1 +
 arch/riscv/include/asm/insn-def.h   | 66 +++++++++++++++++++++++++++++
 arch/riscv/include/asm/processor.h  | 25 ++++++++++-
 arch/riscv/kernel/cpufeature.c      | 21 +++++++++
 arch/riscv/mm/cacheflush.c          | 14 ++++--
 9 files changed, 142 insertions(+), 10 deletions(-)

-- 
2.39.2