linux-kernel - Re: [PATCH] riscv: hwprobe: export Zabha extension

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Message-ID: <4b950430-6f12-4b4d-a516-e09a38b83ff0@rivosinc.com>
Date: Tue, 22 Apr 2025 14:26:39 +0200
From: Clément Léger <cleger@...osinc.com>
To: Alexandre Ghiti <alexghiti@...osinc.com>, Jonathan Corbet
 <corbet@....net>, Paul Walmsley <paul.walmsley@...ive.com>,
 Palmer Dabbelt <palmer@...belt.com>, Alexandre Ghiti <alex@...ti.fr>,
 linux-doc@...r.kernel.org, linux-riscv@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: hwprobe: export Zabha extension



On 21/04/2025 16:14, Alexandre Ghiti wrote:
> Export Zabha through the hwprobe syscall.
> 
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
> ---
>  Documentation/arch/riscv/hwprobe.rst  | 4 ++++
>  arch/riscv/include/uapi/asm/hwprobe.h | 1 +
>  arch/riscv/kernel/sys_hwprobe.c       | 1 +
>  3 files changed, 6 insertions(+)
> 
> diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
> index f60bf5991755..a4998ad2dfe0 100644
> --- a/Documentation/arch/riscv/hwprobe.rst
> +++ b/Documentation/arch/riscv/hwprobe.rst
> @@ -271,6 +271,10 @@ The following keys are defined:
>    * :c:macro:`RISCV_HWPROBE_EXT_ZICBOM`: The Zicbom extension is supported, as
>         ratified in commit 3dd606f ("Create cmobase-v1.0.pdf") of riscv-CMOs.
>  
> +  * :c:macro:`RISCV_HWPROBE_EXT_ZABHA`: The Zabha extension is supported as
> +       ratified in commit 49f49c842ff9 ("Update to Rafified state") of
> +       riscv-zabha.
> +
>  * :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: Deprecated.  Returns similar values to
>       :c:macro:`RISCV_HWPROBE_KEY_MISALIGNED_SCALAR_PERF`, but the key was
>       mistakenly classified as a bitmask rather than a value.
> diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h
> index 3c2fce939673..fca15f2bf6f3 100644
> --- a/arch/riscv/include/uapi/asm/hwprobe.h
> +++ b/arch/riscv/include/uapi/asm/hwprobe.h
> @@ -81,6 +81,7 @@ struct riscv_hwprobe {
>  #define		RISCV_HWPROBE_EXT_ZICBOM	(1ULL << 55)
>  #define		RISCV_HWPROBE_EXT_ZAAMO		(1ULL << 56)
>  #define		RISCV_HWPROBE_EXT_ZALRSC	(1ULL << 57)
> +#define		RISCV_HWPROBE_EXT_ZABHA		(1ULL << 58)
>  #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_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c
> index 249aec8594a9..ed3123396a96 100644
> --- a/arch/riscv/kernel/sys_hwprobe.c
> +++ b/arch/riscv/kernel/sys_hwprobe.c
> @@ -96,6 +96,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
>  		 * presence in the hart_isa bitmap, are made.
>  		 */
>  		EXT_KEY(ZAAMO);
> +		EXT_KEY(ZABHA);
>  		EXT_KEY(ZACAS);
>  		EXT_KEY(ZALRSC);
>  		EXT_KEY(ZAWRS);

Hi Alex,

Looks good to me,

Reviewed-by: Clément Léger <cleger@...osinc.com>

Thanks,

Clément