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 <cle...@rivosinc.com>
>> Reviewed-by: Conor Dooley <conor.doo...@microchip.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;
>> +}
