linux-kernel - Re: [PATCH 07/10] riscv: add ISA extension parsing for Zcmop

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Date: Wed, 10 Apr 2024 23:27:16 +0100
From: Conor Dooley <conor@...nel.org>
To: Deepak Gupta <debug@...osinc.com>
Cc: Clément Léger <cleger@...osinc.com>,
	Jonathan Corbet <corbet@....net>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Anup Patel <anup@...infault.org>, Shuah Khan <shuah@...nel.org>,
	Atish Patra <atishp@...shpatra.org>, linux-doc@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, kvm@...r.kernel.org,
	kvm-riscv@...ts.infradead.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 07/10] riscv: add ISA extension parsing for Zcmop

On Wed, Apr 10, 2024 at 11:16:11PM +0100, Conor Dooley wrote:
> On Wed, Apr 10, 2024 at 02:32:41PM -0700, Deepak Gupta wrote:
> > On Wed, Apr 10, 2024 at 11:11:00AM +0200, Clément Léger wrote:
> > > Add parsing for Zcmop ISA extension which was ratified in commit
> > > b854a709c00 ("Zcmop is ratified/1.0") of the riscv-isa-manual.
> > > 
> > > Signed-off-by: Clément Léger <cleger@...osinc.com>
> > > ---
> > > arch/riscv/include/asm/hwcap.h | 1 +
> > > arch/riscv/kernel/cpufeature.c | 1 +
> > > 2 files changed, 2 insertions(+)
> > > 
> > > diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> > > index b7551bad341b..cff7660de268 100644
> > > --- a/arch/riscv/include/asm/hwcap.h
> > > +++ b/arch/riscv/include/asm/hwcap.h
> > > @@ -86,6 +86,7 @@
> > > #define RISCV_ISA_EXT_ZCB		77
> > > #define RISCV_ISA_EXT_ZCD		78
> > > #define RISCV_ISA_EXT_ZCF		79
> > > +#define RISCV_ISA_EXT_ZCMOP		80
> > > 
> > > #define RISCV_ISA_EXT_XLINUXENVCFG	127
> > > 
> > > diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> > > index 09dee071274d..f1450cd7231e 100644
> > > --- a/arch/riscv/kernel/cpufeature.c
> > > +++ b/arch/riscv/kernel/cpufeature.c
> > > @@ -265,6 +265,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
> > > 	__RISCV_ISA_EXT_DATA(zcb, RISCV_ISA_EXT_ZCB),
> > > 	__RISCV_ISA_EXT_DATA(zcd, RISCV_ISA_EXT_ZCD),
> > > 	__RISCV_ISA_EXT_DATA(zcf, RISCV_ISA_EXT_ZCF),
> > > +	__RISCV_ISA_EXT_DATA(zcmop, RISCV_ISA_EXT_ZCMOP),
> > 
> > As per spec zcmop is dependent on zca. So perhaps below ?
> > 
> > __RISCV_ISA_EXT_SUPERSET(zicboz, RISCV_ISA_EXT_ZCMOP, RISCV_ISA_EXT_ZCA)
> 
> What's zicboz got to do with it, copy-pasto I guess?
> If we're gonna imply stuff like this though I think we need some
> comments explaining why it's okay.

Also, I'm inclined to call that out specifically in the binding, I've
not yet checked if dependencies actually work for elements of a string
array like the do for individual properties. I'll todo list that..

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