linux-kernel - Re: [PATCH v7 08/16] riscv: add ISA parsing for Zca, Zcf, Zcd and Zcb

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Message-ID: <20240624-remission-dominoes-9f22be5ba999@wendy>
Date: Mon, 24 Jun 2024 11:28:41 +0100
From: Conor Dooley <conor.dooley@...rochip.com>
To: Clément Léger <cleger@...osinc.com>
CC: Conor Dooley <conor@...nel.org>, 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 v7 08/16] riscv: add ISA parsing for Zca, Zcf, Zcd and Zcb

On Mon, Jun 24, 2024 at 10:24:51AM +0200, Clément Léger wrote:
> 
> 
> On 23/06/2024 17:42, Conor Dooley wrote:
> > On Wed, Jun 19, 2024 at 01:35:18PM +0200, Clément Léger wrote:
> >> The Zc* standard extension for code reduction introduces new extensions.
> >> This patch adds support for Zca, Zcf, Zcd and Zcb. Zce, Zcmt and Zcmp
> >> are left out of this patch since they are targeting microcontrollers/
> >> embedded CPUs instead of application processors.
> >>
> >> Signed-off-by: Clément Léger <cleger@...osinc.com>
> >> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> >> ---
> >>  arch/riscv/include/asm/hwcap.h |  4 +++
> >>  arch/riscv/kernel/cpufeature.c | 55 +++++++++++++++++++++++++++++++++-
> >>  2 files changed, 58 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> >> index 18859277843a..b12ae3f2141c 100644
> >> --- a/arch/riscv/include/asm/hwcap.h
> >> +++ b/arch/riscv/include/asm/hwcap.h
> >> @@ -87,6 +87,10 @@
> >>  #define RISCV_ISA_EXT_ZVE64F		78
> >>  #define RISCV_ISA_EXT_ZVE64D		79
> >>  #define RISCV_ISA_EXT_ZIMOP		80
> >> +#define RISCV_ISA_EXT_ZCA		81
> >> +#define RISCV_ISA_EXT_ZCB		82
> >> +#define RISCV_ISA_EXT_ZCD		83
> >> +#define RISCV_ISA_EXT_ZCF		84
> >>  
> >>  #define RISCV_ISA_EXT_XLINUXENVCFG	127
> >>  
> >> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> >> index a3af976f36c9..aa631fe49b7c 100644
> >> --- a/arch/riscv/kernel/cpufeature.c
> >> +++ b/arch/riscv/kernel/cpufeature.c
> >> @@ -111,6 +111,9 @@ static int riscv_ext_zicboz_validate(const struct riscv_isa_ext_data *data,
> >>  
> >>  #define __RISCV_ISA_EXT_DATA(_name, _id) _RISCV_ISA_EXT_DATA(_name, _id, NULL, 0, NULL)
> >>  
> >> +#define __RISCV_ISA_EXT_DATA_VALIDATE(_name, _id, _validate) \
> >> +			_RISCV_ISA_EXT_DATA(_name, _id, NULL, 0, _validate)
> >> +
> >>  /* Used to declare pure "lasso" extension (Zk for instance) */
> >>  #define __RISCV_ISA_EXT_BUNDLE(_name, _bundled_exts) \
> >>  	_RISCV_ISA_EXT_DATA(_name, RISCV_ISA_EXT_INVALID, _bundled_exts, \
> >> @@ -122,6 +125,37 @@ static int riscv_ext_zicboz_validate(const struct riscv_isa_ext_data *data,
> >>  #define __RISCV_ISA_EXT_SUPERSET_VALIDATE(_name, _id, _sub_exts, _validate) \
> >>  	_RISCV_ISA_EXT_DATA(_name, _id, _sub_exts, ARRAY_SIZE(_sub_exts), _validate)
> >>  
> >> +static int riscv_ext_zca_depends(const struct riscv_isa_ext_data *data,
> > 
> > It's super minor, but my OCD doesn't like this being called "depends"
> > when the others are all called "validate".
> 
> Ok, let's make a deal. You review patch 14/16 and I'll make the machine
> part of you happy and call this function validate ;)

I generally avoid the hwprobe patches intentionally :) I'm not even
expecting a respin for this tbh, I'd like to just get it in so that I
can do things on top of it.

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