linux-kernel - [PATCH 0/2] Implementing bitops rotate using riscv Zbb extension

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Message-ID: <20250620111610.52750-1-cp0613@linux.alibaba.com>
Date: Fri, 20 Jun 2025 19:16:08 +0800
From: cp0613@...ux.alibaba.com
To: yury.norov@...il.com,
	linux@...musvillemoes.dk,
	arnd@...db.de,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	alex@...ti.fr
Cc: linux-riscv@...ts.infradead.org,
	linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Chen Pei <cp0613@...ux.alibaba.com>
Subject: [PATCH 0/2] Implementing bitops rotate using riscv Zbb extension

From: Chen Pei <cp0613@...ux.alibaba.com>

This patch series moves the ror*/rol* functions from include/linux/bitops.h
to include/asm-generic/bitops/rotate.h as a generic implementation.

At the same time, an optimized implementation is made based on the bitwise
rotation instructions provided by the RISC-V Zbb extension[1].

Based on the RISC-V processor XUANTIE C908, I tested the performance of
sha3_generic. Compared with the generic implementation, the RISC-V Zbb
instruction implementation performance increased by an average of 6.87%.

Test method:
1. CONFIG_CRYPTO_TEST=m
2. modprobe tcrypt mode=322 sec=3
Different parameters will be selected to test the performance of sha3-224.

[1] https://github.com/riscv/riscv-bitmanip/

Chen Pei (2):
  bitops: generic rotate
  bitops: rotate: Add riscv implementation using Zbb extension

 arch/riscv/include/asm/bitops.h     | 127 ++++++++++++++++++++++++++++
 include/asm-generic/bitops.h        |   2 +-
 include/asm-generic/bitops/rotate.h |  97 +++++++++++++++++++++
 include/linux/bitops.h              |  80 ------------------
 tools/include/asm-generic/bitops.h  |   2 +-
 5 files changed, 226 insertions(+), 82 deletions(-)
 create mode 100644 include/asm-generic/bitops/rotate.h

-- 
2.49.0