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

[Conor Dooley]

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.
> > > 
> > > 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 at 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 +++++++++++
> > 
> > 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.

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