linux-kernel - Re: [PATCH v5 6/8] riscv: hwprobe: add zve Vector subextensions into hwprobe interface

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Message-ID: <20240530-daylong-pelican-74ccadb9811f@spud>
Date: Thu, 30 May 2024 22:55:03 +0100
From: Conor Dooley <conor@...nel.org>
To: Palmer Dabbelt <palmer@...belt.com>
Cc: andy.chiu@...ive.com, Paul Walmsley <paul.walmsley@...ive.com>,
	aou@...s.berkeley.edu, Conor Dooley <conor.dooley@...rochip.com>,
	Heiko Stuebner <heiko@...ech.de>, guoren@...nel.org,
	robh@...nel.org, krzysztof.kozlowski+dt@...aro.org, corbet@....net,
	Evan Green <evan@...osinc.com>, cleger@...osinc.com,
	shuah@...nel.org, linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org, vincent.chen@...ive.com,
	greentime.hu@...ive.com, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v5 6/8] riscv: hwprobe: add zve Vector subextensions into
 hwprobe interface

On Thu, May 30, 2024 at 02:35:51PM -0700, Palmer Dabbelt wrote:
> On Thu, 09 May 2024 09:26:56 PDT (-0700), andy.chiu@...ive.com wrote:
> > diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c
> > index 969ef3d59dbe..35390b4a5a17 100644
> > --- a/arch/riscv/kernel/sys_hwprobe.c
> > +++ b/arch/riscv/kernel/sys_hwprobe.c
> > @@ -114,6 +114,11 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
> >  		EXT_KEY(ZIHINTPAUSE);
> > 
> >  		if (has_vector()) {
> > +			EXT_KEY(ZVE32X);
> > +			EXT_KEY(ZVE32F);
> > +			EXT_KEY(ZVE64X);
> > +			EXT_KEY(ZVE64F);
> > +			EXT_KEY(ZVE64D);
> >  			EXT_KEY(ZVBB);
> >  			EXT_KEY(ZVBC);
> >  			EXT_KEY(ZVKB);
> 
> Conor left a comment over here <https://lore.kernel.org/all/20240510-zve-detection-v5-6-0711bdd26c12@sifive.com/>.

This link is to the patch you're replying to, not anything from me.
I commented on a bunch of stuff in v4, but not this patch - generally I
ignore hwprobe to be honest...

> I think the best bet is to just merge this v5 on for-next now, though --
> there's a bunch of patch sets touching ISA string parsing and IIUC that
> sub-extension parsing stuff is a pre-existing issue, and Clement's patch set
> still has some outstanding feedback to address.
> 
> So I think if we just go with this we're not regressing anything, we just
> have a bit more to clean up.  Maybe it's a little uglier now that userspace
> can see the sub-extensions, but I'd bet wacky ISA strings will be able to
> confuse us for a while.

I wanna do some cleanup stuff w/ Clements series applied, if that's what
you were talking about, but I don't see much point starting that until
the cpufeature stuff has calmed down - Charlie's and Clement's series
really need to be in for-next for it to be worth doing.

> I staged this so I can throw it at the tester, LMK if anyone has issues
> otherwise it'll show up on for-next.

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