linux-kernel - Re: [PATCH v5 08/16] riscv: add ISA parsing for Zca, Zcf, Zcd and Zcb

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Message-ID: <06d8ae43-4aad-4637-a33b-9bae91b23872@rivosinc.com>
Date: Tue, 4 Jun 2024 09:18:25 +0200
From: Clément Léger <cleger@...osinc.com>
To: Palmer Dabbelt <palmer@...belt.com>
Cc: Conor Dooley <conor@...nel.org>, corbet@....net,
 Paul Walmsley <paul.walmsley@...ive.com>, aou@...s.berkeley.edu,
 robh@...nel.org, krzysztof.kozlowski+dt@...aro.org, anup@...infault.org,
 shuah@...nel.org, 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 v5 08/16] riscv: add ISA parsing for Zca, Zcf, Zcd and Zcb



On 30/05/2024 23:13, Palmer Dabbelt wrote:
> On Wed, 22 May 2024 00:20:09 PDT (-0700), cleger@...osinc.com wrote:
>>
>>
>> On 21/05/2024 21:49, Conor Dooley wrote:
>>> On Fri, May 17, 2024 at 04:52:48PM +0200, Clément Léger wrote:
>>>
>>>> +static int riscv_ext_zca_depends(const struct riscv_isa_ext_data
>>>> *data,
>>>> +                 const unsigned long *isa_bitmap)
>>>> +{
>>>> +    return __riscv_isa_extension_available(isa_bitmap,
>>>> RISCV_ISA_EXT_ZCA) ? 0 : -EPROBE_DEFER;
>>>> +}
>>>> +static int riscv_ext_zcd_validate(const struct riscv_isa_ext_data
>>>> *data,
>>>> +                  const unsigned long *isa_bitmap)
>>>> +{
>>>> +    return __riscv_isa_extension_available(isa_bitmap,
>>>> RISCV_ISA_EXT_ZCA) &&
>>>> +           __riscv_isa_extension_available(isa_bitmap,
>>>> RISCV_ISA_EXT_d) ? 0 : -EPROBE_DEFER;
>>>> +}
>>>
>>> Could you write the logic in these out normally please? I think they'd
>>> be more understandable (particular this second one) broken down and with
>>> early return.
>>
>> Yes sure. I'll probably make the same thing for zcf_validate as well as
>> removing the #ifdef and using IS_ENABLED():
>>
>> 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;
>> }
> 
> Are you going to send a v6 (sorry if I missed it, I'm trying to untangle
> all these ISA parsing patch sets).

Yes, I was waiting for more feedback/Rb by it seems like I now have
everything I need. I'll send that.

Thanks,

Clément

> 
>>
>>>
>>> Otherwise,
>>> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
>>>
>>> Cheers,
>>> Conor.