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

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Date: Mon, 24 Jun 2024 10:24:51 +0200
From: Clément Léger <cleger@...osinc.com>
To: Conor Dooley <conor@...nel.org>
Cc: 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,
 Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v7 08/16] riscv: add ISA parsing for Zca, Zcf, Zcd and Zcb



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 ;)

Thanks,

Clément

> 
>> +				 const unsigned long *isa_bitmap)
>> +{
>> +	if (__riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_ZCA))
>> +		return 0;
>> +
>> +	return -EPROBE_DEFER;
>> +}
>> +static int riscv_ext_zcd_validate(const struct riscv_isa_ext_data *data,
>> +				  const unsigned long *isa_bitmap)
>> +{
>> +	if (__riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_ZCA) &&
>> +	    __riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_d))
>> +		return 0;
>> +
>> +	return -EPROBE_DEFER;
>> +}
>> +
>> +static int riscv_ext_zcf_validate(const struct riscv_isa_ext_data *data,
>> +				  const unsigned long *isa_bitmap)
>> +{
>> +	if (IS_ENABLED(CONFIG_64BIT))
>> +		return -EINVAL;
>> +
>> +	if (__riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_ZCA) &&
>> +	    __riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_f))
>> +		return 0;
>> +
>> +	return -EPROBE_DEFER;
>> +}