Re: [PATCH v5 09/16] riscv: hwprobe: export Zca, Zcf, Zcd and Zcb ISA extensions

[Charlie Jenkins <charlie@rivosinc.com>]

On Fri, May 17, 2024 at 04:52:49PM +0200, Clément Léger wrote:
> Export Zca, Zcf, Zcd and Zcb ISA extension through hwprobe.
> 
> Signed-off-by: Clément Léger <cleger@rivosinc.com>
> ---
>  Documentation/arch/riscv/hwprobe.rst  | 20 ++++++++++++++++++++
>  arch/riscv/include/uapi/asm/hwprobe.h |  4 ++++
>  arch/riscv/kernel/sys_hwprobe.c       |  4 ++++
>  3 files changed, 28 insertions(+)
> 
> diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
> index 48be38e0b788..cad84f51412d 100644
> --- a/Documentation/arch/riscv/hwprobe.rst
> +++ b/Documentation/arch/riscv/hwprobe.rst
> @@ -196,6 +196,26 @@ The following keys are defined:
>         supported as defined in the RISC-V ISA manual starting from commit
>         58220614a5f ("Zimop is ratified/1.0").
>  
> +  * :c:macro:`RISCV_HWPROBE_EXT_ZCA`: The Zca extension part of Zc* standard
> +       extensions for code size reduction, as ratified in commit 8be3419c1c0
> +       ("Zcf doesn't exist on RV64 as it contains no instructions") of
> +       riscv-code-size-reduction.
> +
> +  * :c:macro:`RISCV_HWPROBE_EXT_ZCB`: The Zcb extension part of Zc* standard
> +       extensions for code size reduction, as ratified in commit 8be3419c1c0
> +       ("Zcf doesn't exist on RV64 as it contains no instructions") of
> +       riscv-code-size-reduction.
> +
> +  * :c:macro:`RISCV_HWPROBE_EXT_ZCD`: The Zcd extension part of Zc* standard
> +       extensions for code size reduction, as ratified in commit 8be3419c1c0
> +       ("Zcf doesn't exist on RV64 as it contains no instructions") of
> +       riscv-code-size-reduction.
> +
> +  * :c:macro:`RISCV_HWPROBE_EXT_ZCF`: The Zcf extension part of Zc* standard
> +       extensions for code size reduction, as ratified in commit 8be3419c1c0
> +       ("Zcf doesn't exist on RV64 as it contains no instructions") of
> +       riscv-code-size-reduction.
> +
>  * :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 3b16a12204b1..652b2373729f 100644
> --- a/arch/riscv/include/uapi/asm/hwprobe.h
> +++ b/arch/riscv/include/uapi/asm/hwprobe.h
> @@ -61,6 +61,10 @@ struct riscv_hwprobe {
>  #define		RISCV_HWPROBE_EXT_ZICOND	(1ULL << 35)
>  #define		RISCV_HWPROBE_EXT_ZIHINTPAUSE	(1ULL << 36)
>  #define		RISCV_HWPROBE_EXT_ZIMOP		(1ULL << 37)
> +#define		RISCV_HWPROBE_EXT_ZCA		(1ULL << 38)
> +#define		RISCV_HWPROBE_EXT_ZCB		(1ULL << 39)
> +#define		RISCV_HWPROBE_EXT_ZCD		(1ULL << 40)
> +#define		RISCV_HWPROBE_EXT_ZCF		(1ULL << 41)
>  #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 fc6f4238f0b3..11def345a42d 100644
> --- a/arch/riscv/kernel/sys_hwprobe.c
> +++ b/arch/riscv/kernel/sys_hwprobe.c
> @@ -113,6 +113,8 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
>  		EXT_KEY(ZICOND);
>  		EXT_KEY(ZIHINTPAUSE);
>  		EXT_KEY(ZIMOP);
> +		EXT_KEY(ZCA);
> +		EXT_KEY(ZCB);
>  
>  		if (has_vector()) {
>  			EXT_KEY(ZVBB);
> @@ -133,6 +135,8 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
>  			EXT_KEY(ZFH);
>  			EXT_KEY(ZFHMIN);
>  			EXT_KEY(ZFA);
> +			EXT_KEY(ZCD);
> +			EXT_KEY(ZCF);
>  		}
>  #undef EXT_KEY
>  	}
> -- 
> 2.43.0
> 
> 
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Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>