[PATCH v2 2/4] riscv: hwprobe: Report Zicbop presence and block size

[Andrew Jones]

On Thu, Oct 09, 2025 at 09:41:52PM +0800, Yao Zihong wrote:
> Plumb Zicbop into hwprobe. Semantics mirror Zicbom/Zicboz to keep
> userspace expectations aligned.
> 
> Signed-off-by: Yao Zihong <zihong.plct at isrc.iscas.ac.cn>
> ---
>  arch/riscv/kernel/sys_hwprobe.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c
> index 000f4451a9d8..7a6ae1327504 100644
> --- a/arch/riscv/kernel/sys_hwprobe.c
> +++ b/arch/riscv/kernel/sys_hwprobe.c
> @@ -113,6 +113,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
>  		EXT_KEY(ZCB);
>  		EXT_KEY(ZCMOP);
>  		EXT_KEY(ZICBOM);
> +		EXT_KEY(ZICBOP);
>  		EXT_KEY(ZICBOZ);
>  		EXT_KEY(ZICNTR);
>  		EXT_KEY(ZICOND);
> @@ -293,6 +294,11 @@ static void hwprobe_one_pair(struct riscv_hwprobe *pair,
>  		if (hwprobe_ext0_has(cpus, RISCV_HWPROBE_EXT_ZICBOM))
>  			pair->value = riscv_cbom_block_size;
>  		break;
> +	case RISCV_HWPROBE_KEY_ZICBOP_BLOCK_SIZE:
> +		pair->value = 0;
> +		if (hwprobe_ext0_has(cpus, RISCV_HWPROBE_EXT_ZICBOP))
> +			pair->value = riscv_cbop_block_size;
> +		break;
>  	case RISCV_HWPROBE_KEY_HIGHEST_VIRT_ADDRESS:
>  		pair->value = user_max_virt_addr();
>  		break;
> -- 
> 2.47.2
>

Reviewed-by: Andrew Jones <ajones at ventanamicro.com>