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Date: Wed, 1 May 2024 18:12:56 +0100
From: Conor Dooley <conor@kernel.org>
To: Charlie Jenkins <charlie@rivosinc.com>
Cc: Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>, Guo Ren <guoren@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Samuel Holland <samuel@sholland.org>,
	Conor Dooley <conor.dooley@microchip.com>,
	Evan Green <evan@rivosinc.com>,
	=?iso-8859-1?Q?Cl=E9ment_L=E9ger?= <cleger@rivosinc.com>,
	Jonathan Corbet <corbet@lwn.net>, Shuah Khan <shuah@kernel.org>,
	linux-riscv@lists.infradead.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, Palmer Dabbelt <palmer@rivosinc.com>,
	linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev,
	linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v4 05/16] riscv: Extend cpufeature.c to detect vendor
 extensions
Message-ID: <20240501-drained-gradation-28fbca0cb566@spud>
References: <20240426-dev-charlie-support_thead_vector_6_9-v4-0-b692f3c516ec@rivosinc.com>
 <20240426-dev-charlie-support_thead_vector_6_9-v4-5-b692f3c516ec@rivosinc.com>
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On Wed, May 01, 2024 at 10:10:57AM -0700, Charlie Jenkins wrote:
> 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.
> > >=20
> > > Add a hidden config RISCV_ISA_VENDOR_EXT to conditionally include this
> > > code.
> > >=20
> > > The xtheadvector vendor extension is added using these changes.
> > >=20
> > > Signed-off-by: Charlie Jenkins <charlie@rivosinc.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 +++++++++++
> >=20
> > I see no modifications to cpu.c here, is it intentional that vendor
> > stuff isn't gonna show up in /proc/cpuinfo?
>=20
> 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.

Desired API for programmatic consumption, sure, but for human users
I think it's good to have the info there.

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