linux-kernel - Re: [PATCH v4 05/16] riscv: Extend cpufeature.c to detect vendor extensions

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Message-ID: <ZjJ3oaFWhbLc39sz@ghost>
Date: Wed, 1 May 2024 10:10:57 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: Conor Dooley <conor@...nel.org>
Cc: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Evan Green <evan@...osinc.com>,
	Clément Léger <cleger@...osinc.com>,
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
	linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>,
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 05/16] riscv: Extend cpufeature.c to detect vendor
 extensions

On Wed, May 01, 2024 at 12:40:38PM +0100, Conor Dooley wrote:
> On Fri, Apr 26, 2024 at 02:29:19PM -0700, Charlie Jenkins wrote:
> > Separate vendor extensions out into one struct per vendor
> > instead of adding vendor extensions onto riscv_isa_ext.
> > 
> > Add a hidden config RISCV_ISA_VENDOR_EXT to conditionally include this
> > code.
> > 
> > The xtheadvector vendor extension is added using these changes.
> > 
> > Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
> > ---
> >  arch/riscv/Kconfig                               |  2 +
> >  arch/riscv/Kconfig.vendor                        | 19 ++++++
> >  arch/riscv/include/asm/cpufeature.h              | 18 ++++++
> >  arch/riscv/include/asm/vendor_extensions.h       | 26 ++++++++
> >  arch/riscv/include/asm/vendor_extensions/thead.h | 19 ++++++
> >  arch/riscv/kernel/Makefile                       |  2 +
> >  arch/riscv/kernel/cpufeature.c                   | 77 ++++++++++++++++++------
> >  arch/riscv/kernel/vendor_extensions.c            | 18 ++++++
> >  arch/riscv/kernel/vendor_extensions/Makefile     |  3 +
> >  arch/riscv/kernel/vendor_extensions/thead.c      | 36 +++++++++++
> 
> I see no modifications to cpu.c here, is it intentional that vendor
> stuff isn't gonna show up in /proc/cpuinfo?

I wasn't sure if that's something we were wanting to support since
hwprobe is the prefered api, but I can add that if it is desired.

- Charlie