[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <20251009-440720dc2e40b8a0b8296956@orel>
Date: Thu, 9 Oct 2025 12:09:57 -0500
From: Andrew Jones <ajones@...tanamicro.com>
To: Yao Zihong <zihong.plct@...c.iscas.ac.cn>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
alexghiti@...osinc.com, shuah@...nel.org, samuel.holland@...ive.com, evan@...osinc.com,
cleger@...osinc.com, zihongyao@...look.com, zhangyin2018@...as.ac.cn,
Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>
Subject: Re: [PATCH v2 0/4] riscv: hwprobe: Add Zicbop support
On Thu, Oct 09, 2025 at 09:41:50PM +0800, Yao Zihong wrote:
> Changes since v1:
> ------------------
> - Bump RISCV_HWPROBE_MAX_KEY (modified 1/4).
> - Add documentation for the Zicbop hwprobe bit/key (new 3/4).
> - Add a selftest(prefetch.c) for Zicbop (new 4/4).
>
> Add UAPI and kernel plumbing to expose the Zicbop extension presence
> and its block size through hwprobe. The interface mirrors
> Zicbom/Zicboz. This allows userspace to safely discover and optimize
> for Zicbop when available.
>
> Background: Zicbop is mandated by the RVA22U64 profile. Downstream may
> combine the presence bit with ZICBOP_BLOCK_SIZE to make profile-level
> policy decisions or enable Zicbop-specific optimizations.
>
> Yao Zihong (4):
> uapi: riscv: hwprobe: Add Zicbop extension bit and block-size key
> riscv: hwprobe: Report Zicbop presence and block size
> docs: riscv: Document hwprobe for Zicbop
> selftests/riscv: Add Zicbop prefetch test
>
> Documentation/arch/riscv/hwprobe.rst | 8 +-
> arch/riscv/include/asm/hwprobe.h | 2 +-
> arch/riscv/include/uapi/asm/hwprobe.h | 2 +
> arch/riscv/kernel/sys_hwprobe.c | 6 +
> .../testing/selftests/riscv/hwprobe/Makefile | 5 +-
> .../selftests/riscv/hwprobe/prefetch.c | 236 ++++++++++++++++++
> 6 files changed, 256 insertions(+), 3 deletions(-)
> create mode 100644 tools/testing/selftests/riscv/hwprobe/prefetch.c
>
> --
> 2.47.2
>
I'm not sure why patches 1-3 aren't just squashed together like commit
eb1003970940 ("RISC-V: hwprobe: Expose Zicbom extension and its block
size") does for zicbom.
Thanks,
drew
Powered by blists - more mailing lists