linux-kernel - Re: [PATCH v2 04/12] riscv: add ISA parsing for Zca, Zcf, Zcd and Zcb

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Date: Fri, 19 Apr 2024 16:51:10 +0100
From: Conor Dooley <conor@...nel.org>
To: Clément Léger <cleger@...osinc.com>
Cc: Jonathan Corbet <corbet@....net>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Anup Patel <anup@...infault.org>, Shuah Khan <shuah@...nel.org>,
	Atish Patra <atishp@...shpatra.org>, linux-doc@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, kvm@...r.kernel.org,
	kvm-riscv@...ts.infradead.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 04/12] riscv: add ISA parsing for Zca, Zcf, Zcd and Zcb

On Thu, Apr 18, 2024 at 02:42:27PM +0200, Clément Léger wrote:
> The Zc* standard extension for code reduction introduces new extensions.
> This patch adds support for Zca, Zcf, Zcd and Zcb. Zce, Zcmt and Zcmp
> are left out of this patch since they are targeting microcontrollers/
> embedded CPUs instead of application processors.
> 
> Signed-off-by: Clément Léger <cleger@...osinc.com>
> ---
>  arch/riscv/include/asm/hwcap.h | 4 ++++
>  arch/riscv/kernel/cpufeature.c | 4 ++++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> index 543e3ea2da0e..b7551bad341b 100644
> --- a/arch/riscv/include/asm/hwcap.h
> +++ b/arch/riscv/include/asm/hwcap.h
> @@ -82,6 +82,10 @@
>  #define RISCV_ISA_EXT_ZACAS		73
>  #define RISCV_ISA_EXT_XANDESPMU		74
>  #define RISCV_ISA_EXT_ZIMOP		75
> +#define RISCV_ISA_EXT_ZCA		76
> +#define RISCV_ISA_EXT_ZCB		77
> +#define RISCV_ISA_EXT_ZCD		78
> +#define RISCV_ISA_EXT_ZCF		79
>  
>  #define RISCV_ISA_EXT_XLINUXENVCFG	127
>  
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index 115ba001f1bc..09dee071274d 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -261,6 +261,10 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
>  	__RISCV_ISA_EXT_DATA(zfa, RISCV_ISA_EXT_ZFA),
>  	__RISCV_ISA_EXT_DATA(zfh, RISCV_ISA_EXT_ZFH),
>  	__RISCV_ISA_EXT_DATA(zfhmin, RISCV_ISA_EXT_ZFHMIN),
> +	__RISCV_ISA_EXT_DATA(zca, RISCV_ISA_EXT_ZCA),
> +	__RISCV_ISA_EXT_DATA(zcb, RISCV_ISA_EXT_ZCB),
> +	__RISCV_ISA_EXT_DATA(zcd, RISCV_ISA_EXT_ZCD),
> +	__RISCV_ISA_EXT_DATA(zcf, RISCV_ISA_EXT_ZCF),
>  	__RISCV_ISA_EXT_DATA(zba, RISCV_ISA_EXT_ZBA),
>  	__RISCV_ISA_EXT_DATA(zbb, RISCV_ISA_EXT_ZBB),
>  	__RISCV_ISA_EXT_DATA(zbc, RISCV_ISA_EXT_ZBC),

Ye, this looks exactly like what I "feared".

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