Re: [PATCH 0/3] raid5, raid6: Accelerate RAID math with LoongArch SIMD

[Huacai Chen]

Hi, Xuerui,

On Tue, Aug 1, 2023 at 4:13 PM WANG Xuerui <kernel@xxxxxxxxxx> wrote:
>
> From: WANG Xuerui <git@xxxxxxxxxx>
>
> Hi,
>
> Seeing the LoongArch port recently (finally!) gained the ability to use
> the vector units, I've subsequently ported the RAID5/6 math to LSX and
> LASX (which are LoongArch's 128-bit and 256-bit SIMD extensions), with
> nice speedups observed. They are reasonably straight-forward conversions
> of existing code, and I hope the comments I put in there are helpful
> enough for anyone not familiar with LoongArch assembly to get a rough
> picture of how things work here. Performance numbers are included in
> each commit's commit message.
>
> This series needs [1] ("LoongArch: Allow usage of LSX/LASX in the
> kernel") as a prerequisite, or the vector context would likely get
> corrupted by the vector-unaware kernel_fpu_{begin,end} calls. I tested
> the changes on top of next-20230731 with the raid6test build fixes [2]
> applied, but the series should apply cleanly to v6.5-rc4 (or maybe any
> other tag) too.
Thank you for your patches, but the kernel coding style prefers /* ...
*/ rather than // ...

Huacai
>
> [1]: https://lore.kernel.org/loongarch/20230722072201.2677516-1-chenhuacai@xxxxxxxxxxx/
> [2]: https://lore.kernel.org/linux-raid/20230731104911.411964-1-kernel@xxxxxxxxxx/
>
> WANG Xuerui (3):
>   LoongArch: Add SIMD-optimized XOR routines
>   raid6: Add LoongArch SIMD syndrome calculation
>   raid6: Add LoongArch SIMD recovery implementation
>
>  arch/loongarch/include/asm/xor.h      |  68 ++++
>  arch/loongarch/include/asm/xor_simd.h |  42 +++
>  arch/loongarch/lib/Makefile           |   3 +
>  arch/loongarch/lib/xor_simd.c         |  92 +++++
>  arch/loongarch/lib/xor_simd.h         |  46 +++
>  arch/loongarch/lib/xor_simd_glue.c    |  71 ++++
>  arch/loongarch/lib/xor_template.c     | 109 ++++++
>  include/linux/raid/pq.h               |   4 +
>  lib/raid6/Makefile                    |   1 +
>  lib/raid6/algos.c                     |  16 +
>  lib/raid6/loongarch.h                 |  38 ++
>  lib/raid6/loongarch_simd.c            | 417 +++++++++++++++++++++
>  lib/raid6/recov_loongarch_simd.c      | 501 ++++++++++++++++++++++++++
>  lib/raid6/test/Makefile               |  12 +
>  14 files changed, 1420 insertions(+)
>  create mode 100644 arch/loongarch/include/asm/xor.h
>  create mode 100644 arch/loongarch/include/asm/xor_simd.h
>  create mode 100644 arch/loongarch/lib/xor_simd.c
>  create mode 100644 arch/loongarch/lib/xor_simd.h
>  create mode 100644 arch/loongarch/lib/xor_simd_glue.c
>  create mode 100644 arch/loongarch/lib/xor_template.c
>  create mode 100644 lib/raid6/loongarch.h
>  create mode 100644 lib/raid6/loongarch_simd.c
>  create mode 100644 lib/raid6/recov_loongarch_simd.c
>
>
> base-commit: 5d0c230f1de8c7515b6567d9afba1f196fb4e2f4
> prerequisite-patch-id: 85d08a9828893250ae78dbca9d6e6f8dac755f61
> prerequisite-patch-id: fe0bba41e0bbc676454365ed16fb13fc0aac6ee0
> prerequisite-patch-id: 84ef8212b74e696ce019255bbfd9679d7516f7f7
> prerequisite-patch-id: b1f8fc4e4acdaff7f821a9fcbd063475178e037b
> prerequisite-patch-id: 82aacbf27f249fdefe40dd6bcc712e5795256926
> prerequisite-patch-id: ae4e026e18f92ffcc93f6b135a3bd48fbdded39a
> --
> 2.40.0
>