[PATCH 0/8] ARM: Expose Armv8 AArch32 features via hwcap

Amit Kachhap amit.kachhap at arm.com
Wed Nov 16 22:19:34 PST 2022



On 11/16/22 19:21, Linus Walleij wrote:
> On Wed, Oct 26, 2022 at 7:51 AM Amit Daniel Kachhap
> <amit.kachhap at arm.com> wrote:
> 
>> This series advertise availability of Armv8 features present in AArch32
>> state. These features are mostly Advanced SIMD(fphp, asimdhp, dp,
>> fhm, bf16, i8mm) and few others(sb ssbs). These features are already exposed
>> to user in arm64 kernel. A similar series advertising the features in
>> arm64 kernel in compat mode will be sent separately.
>>
>> Some other remaining features(SPECRES,  ETS, nTLBPA, CSV3, LSMAOC) are not
>> advertised in arm64 kernel so left here also.
>>
>> The entire series is divided feature wise as present in Armv8 manual.
>> The details of these features can be found in Armv8 architecture
>> reference manual available from
>> https://developer.arm.com/documentation/ddi0487/gb/?lang=en
>>
>> All the changes have been tested on Arm FVP Base Revc model after adding
>> necessary model parameters.
> 
> These all make sense and the patches are fairly trivial, so:
> Reviewed-by: Linus Walleij <linus.walleij at linaro.org>
> 
> I was just looking at Marcins feature matrix of some systems found
> in the wild to see which systems will benefit from this and it includes
> Apple M1 and other interesting stuff:
> https://marcin.juszkiewicz.com.pl/download/tables/arm-socs.html
> 
> Can you please put these patches into Russell's patch tracker?

Thanks for the feedback. I submitted them to Russell's patch tracker
with your Reviewed-by.

Amit
> 
> I might add some comment to some patch just for discussion
> but the patches are fine.
> 
> Yours,
> Linus Walleij



More information about the linux-arm-kernel mailing list