linux-kernel - Re: [RFC PATCH 2/5] RISC-V: Expose Ssdtso via hwprobe API

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Message-ID: <2de6d526-918b-44f6-b26a-a0f30c42c5b3@sifive.com>
Date:   Mon, 27 Nov 2023 08:32:39 -0600
From:   Samuel Holland <samuel.holland@...ive.com>
To:     Christoph Muellner <christoph.muellner@...ll.eu>
Cc:     linux-riscv@...ts.infradead.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Anup Patel <apatel@...tanamicro.com>,
        Philipp Tomsich <philipp.tomsich@...ll.eu>,
        Andrew Jones <ajones@...tanamicro.com>,
        Guo Ren <guoren@...nel.org>,
        Daniel Henrique Barboza <dbarboza@...tanamicro.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Björn Töpel <bjorn@...osinc.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Andrea Parri <parri.andrea@...il.com>,
        Will Deacon <will@...nel.org>,
        Daniel Lustig <dlustig@...dia.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC PATCH 2/5] RISC-V: Expose Ssdtso via hwprobe API

Hi Christoph,

On 2023-11-24 1:21 AM, Christoph Muellner wrote:
> From: Christoph Müllner <christoph.muellner@...ll.eu>
> 
> This patch adds Ssdtso to the list of extensions which
> are announced to user-space using te hwprobe API.
> 
> Signed-off-by: Christoph Müllner <christoph.muellner@...ll.eu>
> ---
>  Documentation/arch/riscv/hwprobe.rst  | 3 +++
>  arch/riscv/include/uapi/asm/hwprobe.h | 1 +
>  arch/riscv/kernel/sys_riscv.c         | 1 +
>  3 files changed, 5 insertions(+)
> 
> diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
> index 7b2384de471f..8de3349e0ca2 100644
> --- a/Documentation/arch/riscv/hwprobe.rst
> +++ b/Documentation/arch/riscv/hwprobe.rst
> @@ -80,6 +80,9 @@ The following keys are defined:
>    * :c:macro:`RISCV_HWPROBE_EXT_ZICBOZ`: The Zicboz extension is supported, as
>         ratified in commit 3dd606f ("Create cmobase-v1.0.pdf") of riscv-CMOs.
>  
> +  * :c:macro:`RISCV_HWPROBE_EXT_ZICBOZ`: The Ssdtso extension is supported, as

Should be RISCV_HWPROBE_EXT_SSDTSO.

Regards,
Samuel

> +       in version v1.0-draft2 of the corresponding extension.
> +
>  * :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: A bitmask that contains performance
>    information about the selected set of processors.
>  
> diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h
> index b659ffcfcdb4..ed450c64e6b2 100644
> --- a/arch/riscv/include/uapi/asm/hwprobe.h
> +++ b/arch/riscv/include/uapi/asm/hwprobe.h
> @@ -30,6 +30,7 @@ struct riscv_hwprobe {
>  #define		RISCV_HWPROBE_EXT_ZBB		(1 << 4)
>  #define		RISCV_HWPROBE_EXT_ZBS		(1 << 5)
>  #define		RISCV_HWPROBE_EXT_ZICBOZ	(1 << 6)
> +#define		RISCV_HWPROBE_EXT_SSDTSO	(1 << 7)
>  #define RISCV_HWPROBE_KEY_CPUPERF_0	5
>  #define		RISCV_HWPROBE_MISALIGNED_UNKNOWN	(0 << 0)
>  #define		RISCV_HWPROBE_MISALIGNED_EMULATED	(1 << 0)
> diff --git a/arch/riscv/kernel/sys_riscv.c b/arch/riscv/kernel/sys_riscv.c
> index c712037dbe10..c654f43b9699 100644
> --- a/arch/riscv/kernel/sys_riscv.c
> +++ b/arch/riscv/kernel/sys_riscv.c
> @@ -162,6 +162,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
>  		EXT_KEY(ZBB);
>  		EXT_KEY(ZBS);
>  		EXT_KEY(ZICBOZ);
> +		EXT_KEY(SSDTSO);
>  #undef EXT_KEY
>  	}
>