linux-kernel - Re: [PATCH RESEND 1/2] riscv: errata: fix T-Head dcache.cva encoding

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Message-ID: <2a6af8f9e869f2fd313b773b4d2c4ce05ae396d1.camel@icenowy.me>
Date:   Tue, 24 Jan 2023 21:19:20 +0800
From:   Icenowy Zheng <uwu@...nowy.me>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Stuebner <heiko@...ech.de>, Guo Ren <guoren@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sergey Matyukevich <sergey.matyukevich@...tacore.com>
Subject: Re: [PATCH RESEND 1/2] riscv: errata: fix T-Head dcache.cva encoding

在 2023-01-03星期二的 14:26 +0800，Icenowy Zheng写道：
> The dcache.cva encoding shown in the comments are wrong, it's for
> dcache.cval1 (which is restricted to L1) instead.
> 
> Fix this in the comment and in the hardcoded instruction.
> 
> Signed-off-by: Icenowy Zheng <uwu@...nowy.me>
> Tested-by: Sergey Matyukevich <sergey.matyukevich@...tacore.com>

Could this patch be included?

As I know, at least two C910 SoCs will be generally available, T-Head's
own TH1520 and Sophgo SG2042.

> ---
> Included when resending:
> - Sergey's Tested-by tag.
> 
>  arch/riscv/include/asm/errata_list.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/errata_list.h
> b/arch/riscv/include/asm/errata_list.h
> index 4180312d2a70..605800bd390e 100644
> --- a/arch/riscv/include/asm/errata_list.h
> +++ b/arch/riscv/include/asm/errata_list.h
> @@ -102,7 +102,7 @@ asm
> volatile(ALTERNATIVE(                                           \
>   * | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 |
>   *   0000001    01001      rs1       000      00000  0001011
>   * dcache.cva rs1 (clean, virtual address)
> - *   0000001    00100      rs1       000      00000  0001011
> + *   0000001    00101      rs1       000      00000  0001011
>   *
>   * dcache.cipa rs1 (clean then invalidate, physical address)
>   * | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 |
> @@ -115,7 +115,7 @@ asm
> volatile(ALTERNATIVE(                                           \
>   *   0000000    11001     00000      000      00000  0001011
>   */
>  #define THEAD_inval_A0 ".long 0x0265000b"
> -#define THEAD_clean_A0 ".long 0x0245000b"
> +#define THEAD_clean_A0 ".long 0x0255000b"
>  #define THEAD_flush_A0 ".long 0x0275000b"
>  #define THEAD_SYNC_S   ".long 0x0190000b"
>