linux-kernel - Re: [PATCH v4 4/9] riscv: cpufeature: add zve32[xf] and zve64[xfd] isa detection

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Message-ID: <20240418-legged-catfish-8358cbe836de@wendy>
Date: Thu, 18 Apr 2024 11:19:55 +0100
From: Conor Dooley <conor.dooley@...rochip.com>
To: Andy Chiu <andy.chiu@...ive.com>
CC: Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
	<palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, Heiko Stuebner
	<heiko@...ech.de>, Guo Ren <guoren@...nel.org>, Conor Dooley
	<conor@...nel.org>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>, Jonathan Corbet <corbet@....net>, Evan
 Green <evan@...osinc.com>, Clément Léger
	<cleger@...osinc.com>, Shuah Khan <shuah@...nel.org>,
	<linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, Palmer
 Dabbelt <palmer@...osinc.com>, Vincent Chen <vincent.chen@...ive.com>,
	Greentime Hu <greentime.hu@...ive.com>, <devicetree@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v4 4/9] riscv: cpufeature: add zve32[xf] and zve64[xfd]
 isa detection

On Fri, Apr 12, 2024 at 02:49:00PM +0800, Andy Chiu wrote:
> Multiple Vector subextensions are added. Also, the patch takes care of
> the dependencies of Vector subextensions by macro expansions. So, if
> some "embedded" platform only reports "zve64f" on the ISA string, the
> parser is able to expand it to zve32x zve32f zve64x and zve64f.
> 
> Signed-off-by: Andy Chiu <andy.chiu@...ive.com>
> ---
> Changelog v3:
>  - renumber RISCV_ISA_EXT_ZVE* to rebase on top of 6.9
>  - alphabetically sort added extensions (Clément)
> Changelog v2:
>  - remove the extension itself from its isa_exts[] list (Clément)
>  - use riscv_zve64d_exts for v's extension list (Samuel)
> ---
>  arch/riscv/include/asm/hwcap.h |  5 +++++
>  arch/riscv/kernel/cpufeature.c | 36 +++++++++++++++++++++++++++++++++++-
>  2 files changed, 40 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> index e17d0078a651..f64d4e98e67c 100644
> --- a/arch/riscv/include/asm/hwcap.h
> +++ b/arch/riscv/include/asm/hwcap.h
> @@ -81,6 +81,11 @@
>  #define RISCV_ISA_EXT_ZTSO		72
>  #define RISCV_ISA_EXT_ZACAS		73
>  #define RISCV_ISA_EXT_XANDESPMU		74
> +#define RISCV_ISA_EXT_ZVE32X		75
> +#define RISCV_ISA_EXT_ZVE32F		76
> +#define RISCV_ISA_EXT_ZVE64X		77
> +#define RISCV_ISA_EXT_ZVE64F		78
> +#define RISCV_ISA_EXT_ZVE64D		79
>  
>  #define RISCV_ISA_EXT_XLINUXENVCFG	127
>  
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index f6f3ece60d69..38d09de518b1 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -188,6 +188,35 @@ static const unsigned int riscv_zvbb_exts[] = {
>  	RISCV_ISA_EXT_ZVKB
>  };
>  
> +#define RISCV_ISA_EXT_ZVE32F_IMPLY_LIST	\
> +	RISCV_ISA_EXT_ZVE32X,

Not really a reason to have a list here, there's only one thing implied.
Otherwise,
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

Cheers,
Conor.

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