Re: [PATCH v3] drivers/perf: Add support for ARMv8.3-SPE

[Suzuki K Poulose]

On 11/27/20 6:03 AM, Wei Li wrote:
> Armv8.3 extends the SPE by adding:
> - Alignment field in the Events packet, and filtering on this event
>    using PMSEVFR_EL1.
> - Support for the Scalable Vector Extension (SVE).
>
> The main additions for SVE are:
> - Recording the vector length for SVE operations in the Operation Type
>    packet. It is not possible to filter on vector length.
> - Incomplete predicate and empty predicate fields in the Events packet,
>    and filtering on these events using PMSEVFR_EL1.
>
> Update the check of pmsevfr for empty/partial predicated SVE and
> alignment event in SPE driver. For adaption by the version of SPE,
> expose 'pmsver' as cap attribute to userspace.
>
> Signed-off-by: Wei Li <liwei391@xxxxxxxxxx>

nit: Do we need to update the Kconfig help text too ? Right now that says :

--


tristate "Enable support for the ARMv8.2 Statistical Profiling Extension""
....

help
  Enable perf support for the ARMv8.2 Statistical Profiling
  Extension, which provides periodic sampling of operations in

--

Suzuki