linux-kernel - Re: [RFC PATCH v8 15/21] riscv: Add vector extension XOR implementation

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Date:   Tue, 14 Sep 2021 16:29:50 +0800
From:   Ley Foon Tan <lftan.linux@...il.com>
To:     Greentime Hu <greentime.hu@...ive.com>
Cc:     linux-riscv@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        aou@...s.berkeley.edu, Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        vincent.chen@...ive.com
Subject: Re: [RFC PATCH v8 15/21] riscv: Add vector extension XOR implementation

On Thu, Sep 9, 2021 at 1:49 AM Greentime Hu <greentime.hu@...ive.com> wrote:
>
> This patch adds support for vector optimized XOR it is tested in spike and
> qemu.
>
> Logs in spike:
> [    0.008365] xor: measuring software checksum speed
> [    0.048885]    8regs     :  1719.000 MB/sec
> [    0.089080]    32regs    :  1717.000 MB/sec
> [    0.129275]    rvv       :  7043.000 MB/sec
> [    0.129525] xor: using function: rvv (7043.000 MB/sec)
>
> Logs in qemu:
> [    0.098943] xor: measuring software checksum speed
> [    0.139391]    8regs     :  2911.000 MB/sec
> [    0.181079]    32regs    :  2813.000 MB/sec
> [    0.224260]    rvv       :    45.000 MB/sec
> [    0.225586] xor: using function: 8regs (2911.000 MB/sec)
>
> Co-developed-by: Han-Kuan Chen <hankuan.chen@...ive.com>
> Signed-off-by: Han-Kuan Chen <hankuan.chen@...ive.com>
> Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
> ---
>  arch/riscv/include/asm/xor.h | 74 ++++++++++++++++++++++++++++++++
>  arch/riscv/lib/Makefile      |  1 +
>  arch/riscv/lib/xor.S         | 81 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 156 insertions(+)
>  create mode 100644 arch/riscv/include/asm/xor.h
>  create mode 100644 arch/riscv/lib/xor.S
>
> diff --git a/arch/riscv/include/asm/xor.h b/arch/riscv/include/asm/xor.h
> new file mode 100644
> index 000000000000..60ee0224913d
> --- /dev/null
> +++ b/arch/riscv/include/asm/xor.h
> @@ -0,0 +1,74 @@


[...]

>
> +extern bool has_vector;
> +#undef XOR_TRY_TEMPLATES
> +#define XOR_TRY_TEMPLATES           \
> +       do {        \
> +               xor_speed(&xor_block_8regs);    \
> +               xor_speed(&xor_block_32regs);    \
> +               if (has_vector) { \
> +                       xor_speed(&xor_block_rvv);\
> +               } \
> +       } while (0)
> +#endif
>
bool has_vector is changed to has_vector() function now, should this
change as well?


Regards
Ley Foon