linux-kernel - Re: [PATCH v2 2/7] RISC-V: Detect AIA CSRs from ISA string

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Date:   Tue, 31 Jan 2023 01:25:55 -0800
From:   Atish Patra <atishp@...shpatra.org>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Anup Patel <anup@...infault.org>, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/7] RISC-V: Detect AIA CSRs from ISA string

On Fri, Jan 27, 2023 at 11:27 PM Anup Patel <apatel@...tanamicro.com> wrote:
>
> We have two extension names for AIA ISA support: Smaia (M-mode AIA CSRs)
> and Ssaia (S-mode AIA CSRs).
>
> We extend the ISA string parsing to detect Smaia and Ssaia extensions.
>
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> ---
>  arch/riscv/include/asm/hwcap.h | 2 ++
>  arch/riscv/kernel/cpu.c        | 2 ++
>  arch/riscv/kernel/cpufeature.c | 2 ++
>  3 files changed, 6 insertions(+)
>
> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> index 86328e3acb02..341ef30a3718 100644
> --- a/arch/riscv/include/asm/hwcap.h
> +++ b/arch/riscv/include/asm/hwcap.h
> @@ -59,6 +59,8 @@ enum riscv_isa_ext_id {
>         RISCV_ISA_EXT_ZIHINTPAUSE,
>         RISCV_ISA_EXT_SSTC,
>         RISCV_ISA_EXT_SVINVAL,
> +       RISCV_ISA_EXT_SMAIA,
> +       RISCV_ISA_EXT_SSAIA,
>         RISCV_ISA_EXT_ID_MAX
>  };
>  static_assert(RISCV_ISA_EXT_ID_MAX <= RISCV_ISA_EXT_MAX);
> diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
> index 1b9a5a66e55a..a215ec929160 100644
> --- a/arch/riscv/kernel/cpu.c
> +++ b/arch/riscv/kernel/cpu.c
> @@ -162,6 +162,8 @@ arch_initcall(riscv_cpuinfo_init);
>   *    extensions by an underscore.
>   */
>  static struct riscv_isa_ext_data isa_ext_arr[] = {
> +       __RISCV_ISA_EXT_DATA(smaia, RISCV_ISA_EXT_SMAIA),
> +       __RISCV_ISA_EXT_DATA(ssaia, RISCV_ISA_EXT_SSAIA),
>         __RISCV_ISA_EXT_DATA(sscofpmf, RISCV_ISA_EXT_SSCOFPMF),
>         __RISCV_ISA_EXT_DATA(sstc, RISCV_ISA_EXT_SSTC),
>         __RISCV_ISA_EXT_DATA(svinval, RISCV_ISA_EXT_SVINVAL),
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index 93e45560af30..3c5b51f519d5 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -228,6 +228,8 @@ void __init riscv_fill_hwcap(void)
>                                 SET_ISA_EXT_MAP("zihintpause", RISCV_ISA_EXT_ZIHINTPAUSE);
>                                 SET_ISA_EXT_MAP("sstc", RISCV_ISA_EXT_SSTC);
>                                 SET_ISA_EXT_MAP("svinval", RISCV_ISA_EXT_SVINVAL);
> +                               SET_ISA_EXT_MAP("smaia", RISCV_ISA_EXT_SMAIA);
> +                               SET_ISA_EXT_MAP("ssaia", RISCV_ISA_EXT_SSAIA);
>                         }
>  #undef SET_ISA_EXT_MAP
>                 }
> --
> 2.34.1
>


Reviewed-by: Atish Patra <atishp@...osinc.com>
-- 
Regards,
Atish