linux-kernel - Re: [PATCH v9 09/12] RISC-V: Add SBI HSM extension definitions

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Message-ID: <CAAhSdy10hJ=Ucc27JZvq1fZ8pBuFnQukMTk6=ghNLOmNqrOyxg@mail.gmail.com>
Date:   Fri, 21 Feb 2020 11:33:40 +0530
From:   Anup Patel <anup@...infault.org>
To:     Atish Patra <atish.patra@....com>
Cc:     "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Borislav Petkov <bp@...e.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Jason Cooper <jason@...edaemon.net>,
        Kees Cook <keescook@...omium.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Mao Han <han_mao@...ky.com>, Marc Zyngier <maz@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Nick Hu <nickhu@...estech.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincent Chen <vincent.chen@...ive.com>
Subject: Re: [PATCH v9 09/12] RISC-V: Add SBI HSM extension definitions

On Fri, Feb 21, 2020 at 6:14 AM Atish Patra <atish.patra@....com> wrote:
>
> SBI specification defines HSM extension that allows to start/stop a hart
> by a supervisor anytime. The specification is available at
>
> https://github.com/riscv/riscv-sbi-doc/blob/master/riscv-sbi.adoc
>
> Add those definitions here.
>
> Signed-off-by: Atish Patra <atish.patra@....com>
> ---
>  arch/riscv/include/asm/sbi.h | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
> index abbf0a7d3b6e..0981a0c97eda 100644
> --- a/arch/riscv/include/asm/sbi.h
> +++ b/arch/riscv/include/asm/sbi.h
> @@ -26,6 +26,7 @@ enum sbi_ext_id {
>         SBI_EXT_TIME = 0x54494D45,
>         SBI_EXT_IPI = 0x735049,
>         SBI_EXT_RFENCE = 0x52464E43,
> +       SBI_EXT_HSM = 0x48534D,
>  };
>
>  enum sbi_ext_base_fid {
> @@ -56,6 +57,19 @@ enum sbi_ext_rfence_fid {
>         SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID,
>  };
>
> +enum sbi_ext_hsm_fid {
> +       SBI_EXT_HSM_HART_START = 0,
> +       SBI_EXT_HSM_HART_STOP,
> +       SBI_EXT_HSM_HART_STATUS,
> +};
> +
> +enum sbi_hsm_hart_status {
> +       SBI_HSM_HART_STATUS_AVAILABLE = 0,
> +       SBI_HSM_HART_STATUS_NOT_AVAILABLE,

Rename "_AVAILABLE" to "_STARTED" and
"_NOT_AVAILABLE" to "STOPPED" to match
SBI v0.2-rc1 spec.

> +       SBI_HSM_HART_STATUS_START_PENDING,
> +       SBI_HSM_HART_STATUS_STOP_PENDING,
> +};
> +
>  #define SBI_SPEC_VERSION_DEFAULT       0x1
>  #define SBI_SPEC_VERSION_MAJOR_SHIFT   24
>  #define SBI_SPEC_VERSION_MAJOR_MASK    0x7f
> --
> 2.25.0
>

Otherwise, looks good to me.

Reviewed-by: Anup Patel <anup.patel@....com>

Regards,
Anup