linux-kernel - Re: [PATCH] riscv: hwprobe: export Zicntr and Zihpm extensions

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Message-ID: <CALSpo=ZsZWNm_cXG_4GXyZ9invSS_eKH=9Q-mdoM2XV=HwzOXA@mail.gmail.com>
Date: Mon, 19 Aug 2024 13:29:16 -0400
From: Jesse Taube <jesse@...osinc.com>
To: Miquel Sabaté Solà <mikisabate@...il.com>
Cc: paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Conor Dooley <conor@...nel.org>
Subject: Re: [PATCH] riscv: hwprobe: export Zicntr and Zihpm extensions

On Sat, Aug 17, 2024 at 3:58 AM Miquel Sabaté Solà <mikisabate@...il.com> wrote:
>
> Export Zicntr and Zihpm ISA extensions through the hwprobe syscall.
>
> Signed-off-by: Miquel Sabaté Solà <mikisabate@...il.com>
> ---
>  Documentation/arch/riscv/hwprobe.rst  | 6 ++++++
>  arch/riscv/include/uapi/asm/hwprobe.h | 2 ++
>  arch/riscv/kernel/sys_hwprobe.c       | 2 ++
>  3 files changed, 10 insertions(+)
>
> diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
> index 3db60a0911df..5bb69c985cce 100644
> --- a/Documentation/arch/riscv/hwprobe.rst
> +++ b/Documentation/arch/riscv/hwprobe.rst
> @@ -188,10 +188,16 @@ The following keys are defined:
>         manual starting from commit 95cf1f9 ("Add changes requested by Ved
>         during signoff")
>
> +  * :c:macro:`RISCV_HWPROBE_EXT_ZICNTR`: The Zicntr extension version 2.0
> +       is supported as defined in the RISC-V ISA manual.
> +
>    * :c:macro:`RISCV_HWPROBE_EXT_ZIHINTPAUSE`: The Zihintpause extension is
>         supported as defined in the RISC-V ISA manual starting from commit
>         d8ab5c78c207 ("Zihintpause is ratified").
>
> +  * :c:macro:`RISCV_HWPROBE_EXT_ZIHPM`: The Zihpm extension version 2.0
> +       is supported as defined in the RISC-V ISA manual.
> +
>    * :c:macro:`RISCV_HWPROBE_EXT_ZVE32X`: The Vector sub-extension Zve32x is
>      supported, as defined by version 1.0 of the RISC-V Vector extension manual.
>
> diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h
> index b706c8e47b02..098a815b3fd4 100644
> --- a/arch/riscv/include/uapi/asm/hwprobe.h
> +++ b/arch/riscv/include/uapi/asm/hwprobe.h
> @@ -72,6 +72,8 @@ struct riscv_hwprobe {
>  #define                RISCV_HWPROBE_EXT_ZCF           (1ULL << 46)
>  #define                RISCV_HWPROBE_EXT_ZCMOP         (1ULL << 47)
>  #define                RISCV_HWPROBE_EXT_ZAWRS         (1ULL << 48)
> +#define                RISCV_HWPROBE_EXT_ZICNTR        (1ULL << 49)
> +#define                RISCV_HWPROBE_EXT_ZIHPM         (1ULL << 50)
>  #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 8d1b5c35d2a7..30aede1c90ff 100644
> --- a/arch/riscv/kernel/sys_hwprobe.c
> +++ b/arch/riscv/kernel/sys_hwprobe.c
> @@ -118,6 +118,8 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
>                 EXT_KEY(ZKSH);
>                 EXT_KEY(ZKT);
>                 EXT_KEY(ZTSO);
> +               EXT_KEY(ZICNTR);
> +               EXT_KEY(ZIHPM);

Conor, do we care about ordering?

Acked-by: Jesse Taube <jesse@...osinc.com>

>
>                 /*
>                  * All the following extensions must depend on the kernel
> --
> 2.46.0
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

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