linux-kernel - Re: [PATCH v2 01/13] RISC-V: add helper function to read the vector VLEN

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Message-ID: <20231128034517.GE1463@sol.localdomain>
Date:   Mon, 27 Nov 2023 19:45:17 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Jerry Shih <jerry.shih@...ive.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, herbert@...dor.apana.org.au,
        davem@...emloft.net, conor.dooley@...rochip.com, ardb@...nel.org,
        heiko@...ech.de, phoebe.chen@...ive.com, hongrong.hsu@...ive.com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH v2 01/13] RISC-V: add helper function to read the vector
 VLEN

On Mon, Nov 27, 2023 at 03:06:51PM +0800, Jerry Shih wrote:
> From: Heiko Stuebner <heiko.stuebner@...ll.eu>
> 
> VLEN describes the length of each vector register and some instructions
> need specific minimal VLENs to work correctly.
> 
> The vector code already includes a variable riscv_v_vsize that contains
> the value of "32 vector registers with vlenb length" that gets filled
> during boot. vlenb is the value contained in the CSR_VLENB register and
> the value represents "VLEN / 8".
> 
> So add riscv_vector_vlen() to return the actual VLEN value for in-kernel
> users when they need to check the available VLEN.
> 
> Signed-off-by: Heiko Stuebner <heiko.stuebner@...ll.eu>
> Signed-off-by: Jerry Shih <jerry.shih@...ive.com>
> ---
>  arch/riscv/include/asm/vector.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)

Reviewed-by: Eric Biggers <ebiggers@...gle.com>

- Eric